JP4042290B2 - Automatic clutch creep control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a creep control device for an automatic clutch that automatically connects and disconnects a friction clutch, and more particularly to a creep control device for an automatic clutch that is suitable for use in a mechanical automatic transmission.
[0002]
[Prior art]
2. Description of the Related Art In recent years, so-called mechanical automatic transmissions in which a manual transmission including a friction clutch and a parallel two-shaft transmission are automated have been developed as transmissions for vehicles such as automobiles. In such a mechanical automatic transmission, a fluid clutch (torque converter) does not intervene in the driving force transmission system from the engine to the drive wheels, so that the transmission efficiency is higher than the automatic transmission using the torque converter and the fuel efficiency is improved. Can be achieved. In addition, drivability is improved because there is no slippage characteristic of the torque converter.
[0003]
[Problems to be solved by the invention]
By the way, since such a mechanical automatic transmission does not have a torque converter as described above, it is not possible to perform a so-called creep operation at a very low speed by minute transmission of engine torque. Therefore, it is conceivable that the mechanical automatic transmission is also configured to perform the creep operation by controlling the engagement state of the friction clutch to the half-clutch state.
[0004]
However, the creep phenomenon is convenient, for example, allowing only a brake operation to enter a garage or finely correcting the parking position, but it has the annoyance that the brake pedal must always be depressed while the vehicle is stopped.
Japanese Patent Publication No. 4-61213 discloses an automatic clutch control apparatus that can arbitrarily select whether or not to perform a creep operation. In this automatic clutch control device, when the creep mode switch is turned on, the clutch is brought into a half-clutch state in which the clutch comes into sliding contact, and creep operation is started. On the other hand, when the accelerator pedal is depressed or the hand brake is pulled In this case, the creep mode switch is automatically turned off to end the creep operation.
[0005]
However, this device has a problem that when the creep operation is performed, the driver has to turn on the creep mode switch each time, so that the operation is complicated and the drivability is not good.
The present invention was devised in view of such a problem, and an automatic clutch that can automatically switch between execution and release of creep control according to the driver's intention and improve drivability. An object of the present invention is to provide a creep control device.
[0006]
[Means for Solving the Problems]
  Thus, the automatic clutch creep control device according to the first aspect of the present invention is obtained from the vehicle speed detection means.Vehicle speedInformation and accelerator operation obtained from accelerator operation detection meansofInformation and brake operation obtained from the brake operation detection meansofInformation and the shift stage obtained from the shift stage detection meansofInformation or shift rangeofInformation and brake pressure obtained by the brake pressure detection meansofAutomatically switches between execution and release of creep control that controls the friction clutch to a half-clutch state based on the informationThe vehicle speed is lower than the first predetermined value, and the accelerator operation is not detected after the accelerator operation is detected within the first predetermined time (that is, the accelerator is Creep control is performed by the control means.
[0007]
  In the creep control device for an automatic clutch according to claim 2 of the present invention,Vehicle speedIs detected as zero, the brake operation is detected, and the brake pressure is detected to be below a predetermined value,SecondContinue for more than a predetermined timeBy the control meansCreep control is executed.
[0008]
  Claim3In the automatic clutch creep control device according to the present invention,ANo csel operation is detected and the brake pressure is above a predetermined value andVehicle speedButSecondWhen it is detected that this state has continued for a third predetermined time or less.By the control meansCreep control is released.
[0009]
  Claim4In the creep control device for an automatic clutch according to the present invention,3In the automatic clutch creep control device described above, the predetermined value of the brake pressure is set according to the road gradient.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The automatic clutch creep control apparatus according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a control block diagram showing the overall functions when the apparatus is applied to a mechanical automatic transmission. 2 is a schematic diagram showing the configuration of the clutch actuator, FIG. 3 is a schematic diagram showing the configuration of the shift select actuator, FIG. 4 is a control block diagram showing the function of the main part, and FIG. 5 is for explaining the creep control. It is a flowchart of.
[0011]
First, a mechanical automatic transmission to which the present invention is applied will be described. This automatic mechanical transmission is different from an automatic transmission having a fluid clutch such as a torque converter, and a friction clutch and a parallel two-shaft transmission. In addition to the driver, an actuator that performs clutch operation and gear shifting operation and an electronically controlled throttle (so-called drive-by-wire system) are attached to a general manual transmission equipped with the above. By performing the control, an automatic shift is configured to be executed.
[0012]
Here, as shown in FIG. 1, the automatic transmission controller (A / T-ECU, hereinafter simply referred to as ECU) 30 includes a shift determination unit 1, a shift execution unit 2, a clutch actuator drive control unit 3, and a shift. A select actuator drive control unit 4 and a throttle actuator drive control unit 5 are provided.
Further, on the vehicle side, an input shaft rotation speed sensor (vehicle speed detection means) 10 that functions as a vehicle speed sensor as well as an input shaft rotation speed of the transmission main body, an accelerator opening that detects an accelerator opening degree or an accelerator pedal depression amount is detected. A degree sensor (accelerator operation detecting means) 11, an engine speed sensor 12 for detecting the engine speed, a throttle opening sensor 13 for detecting the throttle opening, and a release stroke sensor for detecting the release stroke and release hydraulic pressure of the clutch, respectively. A (stroke sensor) 14 and a release fluid pressure sensor (pressure sensor) 15 are provided.
[0013]
Based on the detection information from the vehicle speed sensor 10 and the accelerator opening sensor 11, the shift determination unit 1 determines the timing of upshifting or downshifting (shift determination), and the shift execution unit 2 determines the shift. A control signal is set for each of the actuator drive control units 3 to 5 in response to a shift instruction from the unit 1.
[0014]
The mechanical automatic transmission includes a clutch actuator 6 for connecting / disconnecting a clutch, a shift select actuator 7 for switching transmission / disconnection of the transmission main body, and a throttle opening of an electronically controlled throttle. A throttle actuator 8 is provided. The throttle actuator 8 is constituted by a stepper motor, for example.
[0015]
The actuator drive control units 3 to 5 control the operation of the clutch actuator 6, the shift select actuator 7, and the throttle actuator 8 in accordance with the control signal from the shift execution unit 2. Specifically, when the shift determination unit 1 determines the shift, (1) throttle return operation, (2) clutch disengagement operation, (3) gear change (shift stage switching), and (4) engine rotation speed adjustment , (5) Each operation is executed in the order of the clutch connection operation. In the shift execution unit 2, each drive control unit 3 is operated so that each actuator 6-8 operates at an optimal timing when the shift operation is executed. The control signal is set to .about.5.
[0016]
Next, the configurations of the clutch actuator 6 and the shift select actuator 7 will be briefly described with reference to FIGS.
As shown in FIG. 2, the clutch actuator 6 is provided with a clutch release cylinder 61, and a release fork (not shown) is connected to the tip of a push rod (drive shaft) 61 b of the clutch release cylinder 61. Then, the engagement state of the clutch is controlled by advancing and retracting the push rod 61b of the clutch release cylinder 61 by controlling the supply / discharge state of the working fluid (the working oil in this embodiment) to the chamber 61a of the clutch release cylinder 61. It is like that. Here, when hydraulic oil is supplied to the chamber 61a and the push rod 61b of the clutch release cylinder 61 extends in the right direction in the drawing, the clutch is disengaged.
[0017]
As shown in the figure, a hydraulic pressure source (oil pump) 63, a pressure regulating valve (regulator) 64, a hydraulic pressure supply solenoid 65, a hydraulic pressure discharge solenoid 66, and the like are provided between the chamber 61a and the oil tank 62. The two actuators (open / close valves) 65 and 66 are duty controlled by the clutch actuator drive control unit 3. Then, by controlling the on / off of the two solenoids 65 and 66 in this way, the hydraulic pressure supply state to the chamber 61a is changed, and the clutch is connected / disconnected.
[0018]
For example, the clutch is disconnected by turning on (opening) the solenoid 65 and turning off (closing) the solenoid 66 and supplying hydraulic oil to the chamber 61a. Contrary to the above, the solenoid 65 is turned off (closed) and the solenoid 66 is turned on (opened) to drain the hydraulic oil in the chamber 61a to the oil tank 62, whereby the clutch is connected. Further, as shown in FIG. 2, when both solenoids 65 and 66 are turned off (closed), the state of the clutch is maintained.
[0019]
As described above, the clutch actuator 6 is supplied with the stroke sensor 14 for detecting the position (release stroke) of the push rod 61b of the clutch release cylinder 61 and the pressure of the hydraulic oil (release pressure) supplied to the chamber 61a. A pressure sensor 15 for detection is attached, and detection information of these sensors 14 and 15 is fed back to the clutch actuator drive control unit 3.
[0020]
Next, the shift select actuator 7 will be described with reference to FIG. 3. The shift select actuator 7 includes a shift actuator 71 and a select actuator 72. Among them, the shift actuator 71 is provided so that the operation direction thereof corresponds to the front-rear direction (shift direction) of the shift lever in the manual transmission, and the select actuator 72 is operated in the left-right direction of the shift lever (shift direction). (Select direction).
[0021]
Each of these actuators 71 and 72 is configured as a three-position hydraulic power cylinder that can take three positions. By combining these three positions in the shift direction and three positions in the select direction, manual shifting is performed. The gear position can be switched by an operation corresponding to the shift pattern of the machine.
Here, the configuration of the actuators 71 and 72 will be briefly described by taking the shift actuator 71 as an example. In the actuator 71, two pistons 71a and 71b having different pressure receiving areas are provided. Since the force acting on the pistons 71a and 71b increases according to the pressure receiving area if the oil pressure is constant, the oil pressure is independently applied to the pistons 71a and 71b so that the positions of the pistons 71a and 71b are respectively set. By changing the position, the operating position of the actuator 71 can be switched to three positions as shown in the upper, middle, and lower sides in the figure. The actuator 72 is configured in the same manner as the actuator 71.
[0022]
Further, as shown in the figure, between the actuators 71 and 72 and the oil tank 73, a hydraulic pressure source (oil pump) 74, a pressure regulating valve (regulator) 75, solenoids 76 to 79, and the like are provided. Similar to the clutch actuator 6, the operating oil supply state to each of the pistons 71 a and 71 b is appropriately switched by duty-controlling the solenoids 76 to 79. As a result, the operating positions of the actuators 71 and 72 are switched, and the gear position is switched.
[0023]
The automatic shift is provided with a P range, an N range, an R range, a D range, and the like as shift ranges.
Next, a creep control device that is a main part of the present invention will be described. In the vehicle of this embodiment, in addition to the sensors 10 to 15 described above with reference to FIG. 1, as shown in FIG. 4, a brake switch (which is turned on when the brake pedal is depressed and detects a driver's brake operation) Brake operation detecting means) 17, a shift range sensor (shift speed detecting means) 18 for detecting a shift speed and a shift range of a transmission (not shown), and vehicle brake pressure (here, in particular, hydraulic pressure in a brake / master cylinder) P_BA master cylinder pressure sensor (brake pressure detection means) 19 for detecting the acceleration and an acceleration sensor (hereinafter referred to as G sensor) 20 for detecting the acceleration of the vehicle are provided. As shown in FIG. The above-described clutch actuator drive control unit 3 configured in the ECU 30, the clutch actuator 6, the input shaft rotation speed sensor (vehicle speed detection means) 10, the accelerator opening sensor 11, the brake switch 17, the shift range sensor 18, and the master A cylinder pressure sensor 19 and a G sensor 20 are provided.
[0024]
Then, the creep control device includes vehicle speed information (hereinafter simply referred to as vehicle speed) V calculated by the ECU 30 based on detection information of the input shaft rotational speed sensor 10, accelerator operation information obtained from the accelerator opening sensor 11, brakes Brake operation information obtained from the switch 17, shift range information obtained from the shift range sensor 18, and brake pressure P obtained from the master cylinder pressure sensor 19_BOn the basis of the acceleration information from the G sensor 20 and the road gradient θ calculated by the ECU 30, the clutch actuator drive control unit 3 controls the operation of the clutch actuator 6 according to a predetermined condition, and a friction clutch (not shown). ) Is automatically switched between execution and release of creep control for controlling the clutch to a half-clutch state.
[0025]
Hereinafter, specific switching conditions for execution / release of creep control will be described.
First, the execution condition of creep control will be described. (1) The vehicle is stopped (vehicle speed V = 0) based on the detection information of the input shaft rotational speed sensor 10 on the assumption that the shift range is the traveling range. Is detected, and (2) the brake switch 17 is turned on to detect depression of the brake pedal (brake operation), and (3) the brake pressure P is detected based on the detection information of the master cylinder pressure sensor 19._BIs the predetermined value P₁It is detected that the following conditions are satisfied, and the condition that satisfies the conditions (1) to (3) at the same time is the first predetermined time t.₁When the operation continues, creep control is executed.
[0026]
  That is, when the vehicle is stopped, the brake pedal is once depressed (brake pressure P_BIs the predetermined value P₁For a predetermined time)(Second predetermined time)t₁If the time has elapsed, it is determined that the driver wants to perform a slow speed operation only by operating the brake pedal in anticipation of the creep force, and the creep control is executed. Conversely, the predetermined value P₁Higher brake pressure P_BIf the brake pedal continues to be depressed, it is assumed that the driver is willing to stop the vehicle with the brake and the creep control is not executed.
[0027]
Brake pressure P_BIs the predetermined value P₁One of the conditions for executing the creep control is that the following is satisfied.₁As described above, a brake pressure (necessary brake pressure) that can surely stop the vehicle is used. Necessary brake pressure P₁Is a road gradient θ calculated based on detection information of the G sensor 20, a vehicle body weight M, and a conversion coefficient K for converting braking force into braking pressure._PAnd the constant value α are determined by the following equation (1), and the vehicle body weight M and the conversion coefficient K_PThe constant value α is stored in advance in the ECU 30 as a constant.
[0028]
P₁= Sinθ × M × K_P+ Α (1)
Thus, the required brake pressure P according to the road gradient θ₁This is mainly because of the following reasons.
That is, in this device, as described above, the brake pressure P_BWhen the driver is light enough to stop the vehicle, the driver determines that the creep force is being used to execute a slow speed operation only by turning on / off the brake pedal. Brake pressure P to stop_BFluctuates according to the road gradient θ. Therefore, the required brake pressure P₁Is constant regardless of the road gradient θ, for example, on a steep slope, the brake pressure P is sufficient to stop the vehicle._BEven if the driver depresses the brake pedal, this brake pressure P_BIs already required brake pressure P₁For this reason, there is a possibility that switching to the creep operation cannot be performed according to the driver's intention.
[0029]
Therefore, the necessary brake pressure P according to the road gradient θ is thus obtained.₁For example, on the uphill, the required brake pressure P is set compared with a flat place.₁Even if the driver depresses the brake pedal relatively strongly so that the vehicle does not reverse on an uphill, the required brake pressure P₁Is the brake pressure P that is enough to stop the vehicle._BIt is set to a larger value so that the creep control can be surely executed according to the driver's intention. The constant value α in the above formula (1) is the required brake pressure P₁Is set to a positive number (α> 0).
[0030]
  Also,(1)The vehicle speed V is a relatively low predetermined speed (first predetermined value) V.₁(For example, 5 km / h) or less, and(2)The state where the accelerator pedal is depressed by the accelerator opening sensor 11 is relatively short.PlaceFixed time(First predetermined time)t₂When the accelerator opening sensor 11 is turned off after being detected within (for example, 1 second) (the accelerator pedal is at a predetermined time t₂The creep control is executed when the lighter is stepped on within.
[0031]
That is, even when the driver depresses the accelerator pedal and starts the vehicle without executing creep control, the vehicle speed V remains at the predetermined speed V.₁For example, immediately after starting, the accelerator pedal is short (predetermined time) t.₂When the vehicle is depressed, the driver is about to travel a small distance on a congested road, or is about to move back a small distance by entering a garage, etc. Control is to be executed.
[0032]
  Next, the creep control release condition will be described. The vehicle speed V is a predetermined speed (second predetermined value) V.₂When it is detected that the vehicle speed is 10 km / h or higher (for example, 10 km / h) or higher, it is determined that the vehicle speed is high and the driver is about to shift to normal driving, and the creep control is automatically released.
  Also,(1)An accelerator operation is not detected by the accelerator opening sensor 11, and(2)Brake pressure P_BRequired brake pressure P₁And(3)The vehicle speed V is very small (SecondPredetermined value) V_Three(For example, 2 km / h) or less is the third predetermined time t_ThreeIf it is detected that the vehicle has continued, the vehicle speed is very low._ThreeSince the brake pedal is continuously depressed by the driver when the following vehicle is substantially stopped, it is determined that the driver is about to stop the vehicle completely, and the creep control is automatically released. Yes. In this way, the brake pressure P_BRequired brake pressure P₁This is one of the conditions for canceling the creep control, so that the brake pressure P_BRequired brake pressure P₁Since creep control is not released when the speed is lower than that, the vehicle is prevented from going uphill.
[0033]
Furthermore, (1) the vehicle speed is a very small speed (fourth predetermined value) V_Four(2 km / h) or less, and (2) the brake switch 17 is turned on to detect a brake operation, and (3) the shift range of the transmission is based on the detection result of the shift range sensor 18 [D (Range other than (drive) range, R (reverse) range), when the brake pedal is depressed and the vehicle is substantially stopped, the shift range is P (parking) or N (neutral). ), It is determined that the driver does not intend to drive the vehicle by driving the engine, and the creep control is released.
[0034]
Since the creep control device for an automatic clutch as one embodiment of the present invention is configured as described above, the creep control is executed / released as shown in the flowchart of FIG. 5, for example. That is, first, in step S10, the vehicle speed V is detected based on the detection information of the input shaft rotational speed sensor 10, the shift range is detected based on the detection information of the shift range sensor 18, and the road gradient is determined based on the detection information of the G sensor 20. θ is detected, and the brake pressure P is determined based on the detection information of the master cylinder pressure sensor 19._BIs detected. In step S20, the necessary brake pressure P is determined according to the road gradient θ and the like by the above equation (1).₁Is calculated.
[0035]
In step S30, the vehicle speed V is zero, the brake switch 17 is on, and the brake pressure P_BRequired brake pressure P₁The following state is the predetermined time t₁If it is detected continuously, it is determined that the driver has no intention to accelerate the vehicle promptly and perform normal driving, and is going to perform a slow speed operation, and the routine proceeds to step S90 where creep control is executed. Is done. On the other hand, when such a condition is not satisfied in step S30, the process proceeds to step S40.
[0036]
In step S40, the vehicle speed V is a predetermined speed V.₁The accelerator operation is detected by the accelerator opening sensor 11 for a predetermined time t.₂In the case where the accelerator opening sensor 11 is turned off (that is, the accelerator pedal is set to the predetermined time t).₂The vehicle speed V is equal to the predetermined speed V).₁In a situation where the vehicle speed is low (for example, immediately after starting), the driver takes a short time (predetermined time) t.₂Since the operation of the accelerator pedal is stopped, it is determined that the vehicle is traveling on a congested road or the garage is being entered, and the routine proceeds to step S90 where creep control is executed. When creep control is executed in step S90, the process proceeds to step S50.
[0037]
In step S50, the vehicle speed is a predetermined speed V.₂It is determined whether or not it is equal to or greater than the predetermined speed V₂If it is above, it is determined that the driver is going to shift to normal driving, and the process proceeds to step S100. If creep control is being executed, the creep control is canceled and the process returns.
On the other hand, at step S50, the predetermined speed V₂If it is lower, the process proceeds to step S60, where the accelerator opening sensor 11 is not turned on and the brake pressure P_BRequired brake pressure P₁And the vehicle speed V is very small_ThreeThe following state is the predetermined time t_ThreeIt is determined whether or not the operation has been continued. If such a condition is satisfied, the driver determines that the vehicle is about to be stopped and proceeds to step S100. If creep control is being executed, the creep control is canceled. Return.
[0038]
On the other hand, if the condition is not satisfied in step S60, the process proceeds to step S70, where the vehicle speed is a very small speed V._FourHereinafter, if the brake switch 17 is on and the shift range of the transmission is based on the detection result of the shift range sensor 18, the vehicle is in a non-traveling range (a range other than the D (drive) range and R (reverse) range). If the shift range is switched to the P (parking) or N (neutral) state with the vehicle substantially stopped, and the driver does not intend to drive the vehicle, the process proceeds to step S100. If creep control is being executed, creep control is performed. It is canceled and returns. On the other hand, if such a condition is not satisfied in step S70, the creep control is continued if the creep control is being executed, and the process returns.
[0039]
Therefore, according to the creep control device for the automatic clutch, the driver automatically switches between executing and canceling creep control by operating the switch as in the prior art, whereas execution and cancellation of creep control is automatically performed according to the driver's intention. Therefore, there is an advantage that drivability can be improved. Further, since it is not necessary to provide a special switch for selecting execution and cancellation of creep control, there is an advantage that the cost can be reduced as compared with the conventional apparatus.
[0040]
Further, when the vehicle is stopped (vehicle speed V = 0) and the brake is on, the brake pressure P_BRequired brake pressure P₁The creep control is executed when the following is reached (see step S30 in FIG. 5), and the brake pressure P_BRequired brake pressure P₁This is one of the conditions for releasing the creep control (see step S60 in FIG. 5).₁Is determined according to the road gradient θ [see the above equation (1)]. Thus, for example, even when the driver depresses the brake pedal relatively strongly so as not to reverse the vehicle on a slope, the necessary brake pressure P₁Is the brake pressure P at this time enough to stop the vehicle_BIt is set to a larger value, and even on a slope, the creep control can be executed reliably according to the driver's intention, and the brake pressure P_BRequired brake pressure P₁Even if it becomes below, there is an advantage that it is possible to prevent the vehicle from going uphill and to improve safety.
[0041]
The automatic clutch creep control device of the present invention is not limited to the above-described embodiment. For example, in the above-described embodiment, the accelerator operation detection means is configured by an accelerator opening sensor, but, for example, the accelerator operation detection means may be configured by an accelerator switch that is turned on when an accelerator pedal is depressed.
Each condition for determining execution / cancellation of creep control is limited to the condition in the above-described embodiment as long as it is based on an action that the driver will naturally perform when executing / releasing creep control. Not.
[0042]
In the above-described embodiment, the creep control device for an automatic clutch according to the present invention is applied to a vehicle having a mechanical automatic transmission. However, the creep control device for an automatic clutch according to the present invention is a friction clutch. The present invention can be applied to any vehicle having an automatic clutch that automatically connects and disconnects, for example, a vehicle having a general manual transmission that is manually operated by a driver. . In the above embodiment, the creep control is performed under the condition that the shift range is detected and the shift range is the traveling range. However, when the present apparatus is applied to a manual transmission, For example, the creep control may be performed on the condition that the gear position is in the low gear or the back gear.
[0043]
【The invention's effect】
As described above in detail, according to the creep control device for an automatic clutch according to the first aspect of the present invention, vehicle speed information obtained from the vehicle speed detection means, accelerator operation information obtained from the accelerator operation detection means, and brake operation detection. Based on the brake operation information obtained from the means, the speed information obtained from the speed detection means, and the brake pressure information obtained from the brake pressure detection means, it is automatically performed according to the driver's intention without the driver's switch operation. Therefore, there is an advantage that drivability can be improved by switching between execution and cancellation of creep control.
[0044]
  Further, since a switch for switching between execution and cancellation of creep control is unnecessary, there is an advantage that the cost can be reduced as compared with the conventional apparatus.
    In addition, when the vehicle speed is equal to or lower than the first predetermined value and the accelerator operation is not performed after the accelerator operation is detected within the first predetermined time, the control means is running on the congested road or putting the garage into the garage. The creep control can be automatically executed according to the driver's intention by determining that the operation is being performed. This also has the advantage that drivability can be improved.
  According to the creep control device for an automatic clutch according to the second aspect of the present invention, the state in which the vehicle speed is detected to be zero, the brake operation is detected, and the brake pressure is detected to be equal to or less than a predetermined value is detected.SecondIf it continues for more than a predetermined time,The control meansThe driver can determine that the driver wants to perform the slow speed operation only by the brake operation in anticipation of the creep force, and can automatically execute the creep control according to the driver's intention. This also has the advantage that drivability can be improved.
[0046]
  Claim3According to the automatic clutch creep control device of the present invention describedANo csel operation is detected, the brake pressure is higher than the specified value, and the vehicle speed isSecondIf it is detected that this state continues for a third predetermined time or lessTogetherIsIn the control means,driverIsSince it is determined that the vehicle is normally running or completely stopped and the creep control is automatically canceled without the driver's switch operation, there is an advantage that drivability can be improved.
[0047]
  Claim4According to the automatic clutch creep control device of the present invention described above, since the predetermined value of the brake pressure is set according to the road gradient, for example, the brake pedal is relatively strong so that the driver does not reverse the vehicle on a slope. Even when the vehicle is stepped on, the predetermined value is surely set to be larger than the brake pressure at this time enough to stop the vehicle, and the creep control is reliably executed according to the driver's intention even on the slope. Even if the brake pressure falls below this predetermined value, the vehicleShiThere is an advantage that it is possible to prevent such a situation and improve safety.
[Brief description of the drawings]
FIG. 1 is a control block diagram showing an overall function when an automatic clutch creep control device according to an embodiment of the present invention is applied to a mechanical automatic transmission;
FIG. 2 is a schematic view showing a configuration of a clutch actuator according to a creep control device for an automatic clutch as an embodiment of the present invention.
FIG. 3 is a schematic diagram showing a configuration of a shift select actuator according to a creep control device for an automatic clutch as one embodiment of the present invention.
FIG. 4 is a control block diagram showing functions of a main part of a creep control device for an automatic clutch as an embodiment of the present invention.
FIG. 5 is a flowchart for explaining control of a creep control device for an automatic clutch as one embodiment of the present invention.
[Explanation of symbols]
3 Clutch actuator drive controller
10 Input shaft rotation speed sensor (vehicle speed detection means)
11 Accelerator opening sensor (accelerator operation detection means)
17 Brake switch (brake operation detection means)
18 Shift range sensor (shift speed detecting means)
19 Master cylinder pressure sensor (brake pressure detection means)
20 Acceleration sensor (G sensor)
30 ECU

Claims (4)

An automatic clutch creep control device for automatically connecting and disconnecting a friction clutch,
Vehicle speed detection means for detecting the speed of the vehicle;
An accelerator operation detecting means for detecting the driver's accelerator operation;
Brake operation detecting means for detecting the driver's brake operation;
Gear position detecting means for detecting a gear position or shift range of the transmission;
Brake pressure detecting means for detecting the brake pressure of the vehicle ;
And speed information of the vehicle obtained from the vehicle speed detecting means, said and said accelerator operation information obtained from the accelerator operation detecting means, and the brake operation information obtained from the brake operation detecting means, the speed-change stage detecting means and information of the information or the shift range of the shift speed obtained from, based on the said brake pressure information obtained by the brake pressure detecting means, execution and clear creep control for controlling the friction clutch in the half clutch state Control means for automatically switching between
The control means executes the creep control when the speed of the vehicle is equal to or lower than a first predetermined value and the accelerator operation is not detected after the accelerator operation is detected within the first predetermined time. A creep control device for an automatic clutch, characterized in that: If and the brake pressure is detected detected and the brake operation is that the speed of the vehicle is zero state has been detected as being less than a predetermined value, it has continued a second predetermined time or more, the control means and wherein <br/> performing the creep control, the creep control apparatus for an automatic clutch according to claim 1. If and the brake pressure 該A Kuseru operation is not detected the speed of and the vehicle or the predetermined value is that and this state is below a second predetermined value has been detected to have continued the third predetermined time or more, The creep control device for an automatic clutch according to claim 1 or 2 , wherein the control means cancels the creep control. The predetermined value of the brake pressure, characterized in that it is set according to the road gradient, the creep control apparatus for an automatic clutch according to claim 2 or 3 wherein.

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