JPH11348744A - Braking device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold a braking force even if a pedal operation is released after a vehicle is stopped, to release the braking force by operation to restart driving, to keep the braking force from released at unexpected operation and to avoid unnecessary power and fuel consumption by putting off a brake lamp when the braking force is held when the vehicle is stopped. SOLUTION: This braking device is provided with a braking holding force controlling means 6 constituted by a braking operation detecting means 8 for detecting braking operation of a vehicle and a vehicle stop detecting means 11 for detecting vehicle stop, and an actuator driving means 12 for applying a predetermined barking force to a brake actuator 13 by a command from the braking holding force controlling means 6 when it is determined as vehicle stop by the output from the barking operation detecting means 8 and the vehicle stop detecting means 11. The braking force commanded by the braking holding force controlling means 6 is made to be held after the braking operation is released while the vehicle is stopped till a signal by a predetermined braking force releasing operation is put into the braking holding force controlling means 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular braking device that retains a braking force even after a vehicle stops and releases the braking force by a releasing operation.

[0002]

2. Description of the Related Art After a vehicle is completely stopped by a braking operation, the braking force is maintained even when the operation of a brake pedal is released. This is because of the creep running of an AT vehicle using a fluid torque converter. It is a very effective means of safety, such as prevention of collisions, collision of collisions in a rear-end collision, and prevention of backward running due to inexperience when starting on a slope, and also frees the driver from the hassle of operating the hand brake every time. Is what you do. Such a technique is disclosed in, for example, Japanese Utility Model Application Laid-Open No. 56-4960 and its prior examples.

[0003] In these techniques, after the vehicle is completely stopped by a braking operation, the brake pedal is continuously depressed for a certain period of time, so that an electromagnet for holding the pedal is energized to hold the pedal in a braking position. This holding force is released by depressing the accelerator pedal, driving becomes possible, and when the driver leaves the vehicle, a warning is issued for a certain period of time even when the door is opened, and the warning is released by operating the handbrake. The power supply to the pedal-holding electromagnet is cut off to release the holding force.

[0004]

According to the above prior art, the braking force after the brake pedal operation is released is maintained, and this is effective in terms of safety such as prevention of creep running of an AT car, but is limited. It is possible for the driver to unknowingly touch the accelerator pedal in the driver's seat in the space, which could cause an unexpected accident if the braking force is released, and If the vehicle must be stopped for a relatively long time due to traffic congestion or the like, insufficient charging due to continuous lighting of brake lights, or waste of fuel and increase in exhaust gas due to idle-up during braking will occur.

The present invention has been made to solve such a problem, and the braking force is maintained even when the pedal operation is released after the vehicle has completely stopped, and the braking force is maintained by restarting the operation. Is released and the braking force is not released by an unexpected operation, and the brake light is turned off with the release of the pedal operation, so that unnecessary power consumption and fuel consumption can be avoided. The purpose is to do so.

[0006]

SUMMARY OF THE INVENTION A vehicle braking device according to the present invention has a brake holding force control having a braking operation detecting means for detecting a braking operation and a braking force of a vehicle and a stop detecting means for detecting a stop of the vehicle. Means, a brake operation detecting means and a stop detecting means, and when it is determined that the vehicle has been stopped by the braking operation, the brake actuator is controlled by a command of the brake holding force control means to maintain a predetermined braking force. The braking force commanded by the brake holding force control means, during a stop until a signal by a predetermined braking force release operation is input to the brake holding force control means,
The brake pedal is held even after the brake pedal is returned.

Further, the braking force applied and held while the vehicle is stopped is:
It is configured to be held at the braking force when the vehicle is stopped by the braking operation or immediately before the vehicle is stopped. Further, the braking force applied and held while the vehicle is stopped is set to a value that keeps the vehicle stopped on a predetermined slope.

In the braking force holding state, when the accelerator operation reaches an operation amount exceeding a predetermined value, the holding of the braking force is released. Further, in the braking force holding state, the holding of the braking force is released by detecting that the accelerator operation has been continued for a predetermined time. Still further, in the braking force holding state, it is configured to detect that the change rate (change speed) of the accelerator operation is within a range of a preset reference value, and release the holding of the braking force. is there.

In the braking force holding state, when the accelerator operation is performed and the accelerator operation does not satisfy the condition for releasing the braking force, the throttle opening does not follow the operation of the accelerator, and the condition for releasing the braking force is satisfied. In some cases, a throttle actuator operating means for causing the throttle opening to follow the accelerator operation is provided. Furthermore, the throttle opening follows the accelerator operation in synchronization with the release of the braking force. Further, the throttle opening is limited to a predetermined value until the throttle opening follows the accelerator operation after detecting the accelerator operation.

In the braking force holding state, when the operation of the brake pedal reaches an operation amount exceeding a predetermined value, the holding state of the braking force by the braking holding force control means is released. It was done. Further, in the braking force holding state, it is configured to detect that the operation of the brake pedal has been continued for a predetermined time and release the holding state of the braking force by the braking holding force control means. Furthermore, in the braking force holding state, it is detected that the change rate (change speed) of the operation of the brake pedal is within a range of a preset reference value, and the holding state of the braking force by the braking holding force control unit is released. It is configured to be performed.

Further, in the braking force holding state, the operation of any switch near the console box is detected, and the holding of the braking force is released. Further, it is configured such that the holding of the braking force is released by detecting that the switch operation has been performed for a predetermined time. Still further, the switch operated is an operation switch for a constant-speed traveling device.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is an explanatory diagram showing a configuration of a vehicular braking device according to Embodiment 1 of the present invention, and FIG. 2 is a flowchart illustrating an operation. In the drawing, 1 is a brake pedal for a braking operation of a vehicle, 2 is a brake switch that closes by a braking operation and turns on a brake lamp 3, 4 is a master cylinder that increases the braking operation by hydraulic pressure, 5 is provided on wheels, A wheel cylinder operated by hydraulic pressure from the master cylinder 4, 6 is a brake holding force control means, and the brake holding force control means 6 controls the operation of the brake pedal and the operation amount by a pressure sensor 7 which detects the oil pressure of the master cylinder 4. Whether the vehicle is stopped is determined by an output of a brake operation detecting means 8 for detecting, an accelerator operation detecting means 9 for detecting an operation and an operation amount of an accelerator pedal (not shown), and a vehicle speed sensor 10 for detecting rotation of a wheel. And a stop detecting means 11 for judging the brake actuator. 12 by operating the brake actuator 13 via, is configured to control the release and holding of the braking force.

[0013] In the vehicle braking device according to the first embodiment of the present invention, when the driver performs a braking operation and the vehicle stops, the stop detecting means 11 of the braking holding force control means 6 stops the vehicle. Is supplied to the brake actuator driving means 12 at the time of stopping or immediately before the stop detected by the brake operation detecting means 8, the brake actuator 13 is operated to maintain the braking force, and the operation of the brake pedal 1 is released. Even when this braking force is held, the braking holding force control means 6 waits while repeating the routine shown in the flowchart of FIG. In FIG. 2, in step 201, the brake actuator 13
It is checked whether or not is controlled, and if it is in the control state, the accelerator operation amount is checked in step 202, and if it is more than the preset operation amount, step 203
To release the braking force and enter the running state.

As described above, in the vehicle braking device according to the first embodiment of the present invention, when the vehicle is stopped by the braking operation, the brake holding force control means 6 detects the stopped state and operates the brake actuator 13. , Brake pedal 1
The driver does not need to continue the braking operation because the braking force is maintained irrespective of the operation of the vehicle, and it is not necessary to operate the handbrake. Consumption can be reduced, exhaust gas can be reduced, and even if the driver unconsciously touches the accelerator pedal, the braking force can be reduced if the accelerator operation is equal to or less than a predetermined reference amount. Is not canceled, so that an unexpected accident can be avoided. It is to be noted that the braking force during stopping may be set to a predetermined braking force, for example, a braking force for holding the vehicle stopped on a predetermined slope, instead of the braking force at the time of stopping or immediately before stopping detected by the brake detecting means 8. It is possible.

Embodiment 2 FIG. 3 is a flowchart for explaining the operation of the vehicle brake system according to the second embodiment of the present invention.
The braking force control means 6 is programmed so that the condition for releasing the braking force is set by the accelerator operation time. In FIG. 3, in step 301, it is checked whether or not the brake actuator 13 is controlled.
If it is in the control state, it is checked in step 302 whether or not there is an accelerator operation.
Proceeding to 03, the timer in the braking holding force control means 6 is incremented. In step 304, the state of the increment of the timer is monitored, and when it exceeds a predetermined value, it is determined that the accelerator operation has been performed, and in step 305, the braking force is released, and the accelerator operation is detected without the timer exceeding the predetermined value. If not, the timer is configured in step 306 to return to the initial value.

According to the vehicular braking apparatus of the second embodiment of the present invention thus constructed, the driver maintains the braking force irrespective of the operation of the brake pedal as in the first embodiment, so that the driver can There is no need to continue the braking operation, and when the accelerator operation is continued for a predetermined time, it is determined that the accelerator operation has been performed and the braking force is released, so the driver may inadvertently touch the accelerator pedal. However, the braking force is not released, and an unexpected accident can be avoided.

Embodiment 3 FIG. 4 is a flowchart for explaining the operation of the vehicle braking device according to the third embodiment of the present invention. In this embodiment, the condition for releasing the braking force in the configuration of the first embodiment is set by changing the accelerator operation amount. Thus, the braking holding force control means 6 is programmed to perform the above operation. In FIG. 4, steps 401 and 402 are the same as steps 301 and 302 of the second embodiment.
In step 403, the change amount between the stored value of the accelerator operation amount in the previous routine and the accelerator operation amount in the current routine is detected. In step 404, the current accelerator operation amount is stored for the next routine, and in step 405, The change amount is compared with a preset reference value. If the change amount is within the reference value range, the braking force is released in step 406. If the change amount is outside the reference value range, the next routine is performed. Move on. Steps 407 and 408 hold the stored value of the change amount to zero when there is no change in the accelerator operation. With this configuration, the same safety as in the first embodiment can be obtained, and by combining the detection contents of the first to third embodiments, accidental accelerator operation can be prevented. It is possible to obtain higher security.

Embodiment 4 FIG. 5 is a configuration diagram of a vehicle braking device according to a fourth embodiment of the present invention, and FIG. 6 is a flowchart illustrating the operation thereof. This embodiment includes a brake actuator driving unit 12 and a throttle actuator driving unit 14. A brake control means 15 for stopping the vehicle, a brake operation detecting means 8 and an accelerator operation detecting means 9
The brake actuator driving means 12 controls the brake actuator 13, and the throttle actuator driving means 14 controls the throttle actuator 16
Is operated to perform a more secure braking force holding control.

In the vehicle braking device according to the fourth embodiment of the present invention, at step 601 in the flowchart of FIG. 6, first, it is detected whether or not the brake actuator 13 is controlled, and the control is performed. If so, in step 602, the operation state of the accelerator is detected. When the accelerator operation is being performed, the process proceeds to step 603, for example, in the first to third embodiments.
It is determined whether or not the condition for canceling the braking force described above is satisfied. If it is determined that the condition for releasing the braking force is not satisfied, the brake actuator driving means 12 continues to maintain the braking force, and the throttle actuator driving means 14 determines the throttle opening before the accelerator operation is detected. The opening is maintained (step 605), and if it is determined that the condition for releasing the braking force is satisfied, the braking force is released and the throttle actuator driving means 1
In step 604, the throttle opening is maintained at the opening before the accelerator operation is detected until the braking force is released.
To follow the accelerator operation amount.

With this configuration, it is possible to suppress unnecessary power and fuel consumption described in the first to third embodiments, and to release the braking force due to the driver's careless accelerator operation. In addition to preventing the start of the vehicle, it is possible to prevent an increase in the engine rotation due to an inadvertent operation of the accelerator and a start due to the engine torque exceeding the braking force of the vehicle, thereby further improving safety.

Embodiment 5 FIG. 7 is a flowchart for explaining the operation of the vehicle braking system according to the fifth embodiment of the present invention. In this embodiment, the control by the throttle actuator driving means 14 in the configuration of the fourth embodiment is changed to the operation amount of the accelerator. This is set so as to be executed based on a predetermined program. In the figure, step 7
At 01, it is detected whether or not the brake actuator 13 is controlled, and at 702, the accelerator operation state is detected. If it is detected in step 702 that the accelerator operation has been performed, the operation amount is detected in step 703. If the accelerator operation amount is out of the condition for releasing the braking force, the throttle opening is determined in step 704 as an unconscious accelerator operation. Is kept at a predetermined limit value, and when it is detected that the accelerator operation amount is within the condition for releasing the braking force, and when there is no accelerator operation, the throttle opening is made to follow the accelerator operation amount in step 705. With this configuration, it is possible to avoid sudden start due to inadvertent operation of the driver, and for accelerator operation at the time of start, the throttle opening becomes a predetermined limit value together with the operation,
When the accelerator operation amount falls within the reference value range, the throttle opening is made to follow the accelerator operation, so that a smoother start can be performed.

Embodiment 6 FIG. FIG. 8 is a configuration diagram of a vehicle braking device according to a sixth embodiment of the present invention, and FIG. 9 is a flowchart illustrating the operation thereof. In this embodiment, the release of the brake holding force is not performed by an accelerator operation but by a brake pedal operation. According to the present invention, the release of the braking holding force due to an inadvertent operation of the brake pedal is avoided. As shown in FIG. 8, in the vehicular braking apparatus according to this embodiment, the brake holding force control means 17 is composed of the brake operation detecting means 8 and the stop detecting means 11, and the brake actuator driving means 12 The brake actuator 13 is configured to be operated via the.

In the vehicle braking device of the sixth embodiment configured as described above, in step 901 of FIG. 9, the brake holding force control means 17 detects whether or not the brake actuator 13 is under brake control, and performs control. If it is middle, it is detected in step 902 whether or not the brake pedal is operated again. If it is operated, the operation amount is detected. If the operation amount exceeds a predetermined value, step 903 is executed.
Release the braking force with. By selecting this predetermined value, it is possible to select whether the driver has operated with the intention of releasing the braking force or whether the operation is careless.

Embodiment 7 FIG. FIG. 10 is a flowchart for explaining the operation of the vehicle brake system according to the seventh embodiment of the present invention. In this embodiment, the condition for releasing the braking force in the configuration of the sixth embodiment is set by the operation time of the brake pedal. Thus, the braking holding force control means 17 is programmed so as to perform the control. In step 1001 of FIG. 10, it is detected whether or not the brake actuator 13 is under brake control. If the brake actuator 13 is under control, it is detected in step 1002 whether or not the brake pedal is operated again. Then, the timer in the braking holding force control means 17 is incremented. In step 1004, the state of the timer increment is monitored,
If the operation time exceeds a predetermined value, it is determined that the pedal operation has been performed based on the intention to release the braking force, and the braking force is released in step 1005. For example, in step 1006, the timer is configured to return to the initial value. In this way, it is determined whether the operation is careless.

Embodiment 8 FIG. FIG. 11 is a flowchart for explaining the operation of the vehicular braking apparatus according to the eighth embodiment of the present invention. It is something to set. In FIG.
Steps 1101 and 1102 are the same as steps 1001 and 1002 of the seventh embodiment. Step 11
In step 03, the difference between the stored value of the pedal operation amount in the previous routine and the pedal operation amount in the current routine is detected as a change amount. In step 1104, the current pedal operation amount is stored in preparation for the next routine. Then, the change amount is compared with a preset reference value. If the change amount is within the reference value range, the braking force is released in step 1106. If the change amount is outside the reference value range, the routine is continued. While waiting. If there is no change in the operation amount in step 1107, the stored value is set to zero in step 1108.

Embodiment 9 FIG. 12 is a configuration diagram illustrating the configuration of a vehicle braking system according to Embodiment 9 of the present invention.
3 is an example of a switch used in this embodiment, FIG.
Is a flowchart for explaining the operation. In this embodiment, in a vehicular braking apparatus that holds a braking force while the vehicle is stopped, the braking force is released by a switch operation. In FIG. 12, reference numeral 18 denotes the brake operation detecting means 8, the vehicle stop detecting means 11, and the switch operation detecting means 1.
The brake operation detecting means 8 and the stop detecting means 11 detect when the vehicle is stopped by the braking operation, when the vehicle stops, and when the vehicle stops or immediately before the stop, or The brake operation is generated by the brake actuator 13 via the brake actuator drive unit 12. The switch operation detection unit 19 receives a switch operation for operating a constant speed traveling device as shown in FIG. This is for releasing the braking force during a stop.

In the vehicle braking system of the ninth embodiment having the above-described structure, the braking holding force control means 18 is controlled by the control shown in FIG.
It operates according to a routine shown in the flowchart of FIG.
First, it is determined in step 1401 whether the braking force is held or not.
It is detected whether or not a switch operation for releasing the braking force is performed. If the switch operation is performed, the braking force is released in step 1403, and if the switch operation is not detected, the routine is repeated. In this case as well, in order to determine whether the operation is an inadvertent operation or an operation for releasing the braking force, for example, it is possible to measure the operation time of the switch and avoid the release of the braking force due to an unconscious operation. The switch for operation can be used as a switch for another purpose without being dedicated.

[0028]

As described above, according to the vehicle brake system of the present invention, the braking operation detecting means detects the braking of the vehicle, and the stop detecting means detects the stop of the vehicle. Or a preset value of braking force after stopping the operation of the brake pedal while the vehicle is stopped, so that the braking force can be released by operating the accelerator or the brake pedal. The release condition is determined by the operation amount, operation time, or the value of the change in the operation amount, and when these values are detected and these values reach a predetermined value, the braking force is released. Since the throttle opening was not opened by careless operation, it prevented creeping of the AT car, prevention of collision at the time of rear-end collision, or due to unfamiliarity when starting on a slope Can advance the prevention and stably, a safe vehicle with no such spikes unexpected starting or engine speed of the vehicle by the careless operation brake device can be obtained and,
An excellent vehicular braking device can be obtained such that overdischarge of a battery and waste of fuel can be prevented even during a long traffic jam.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory diagram of a vehicle braking device according to a first embodiment of the present invention.

FIG. 2 is a flowchart illustrating an operation according to the first embodiment of the present invention;

FIG. 3 is a flowchart for explaining an operation according to the second embodiment of the present invention;

FIG. 4 is a flowchart for explaining an operation according to the third embodiment of the present invention;

FIG. 5 is a configuration explanatory view of a vehicle braking device according to a fourth embodiment of the present invention.

FIG. 6 is a flowchart for explaining an operation according to the fourth embodiment of the present invention;

FIG. 7 is a flowchart illustrating an operation according to the fifth embodiment of the present invention.

FIG. 8 is a configuration explanatory view of a vehicle braking device according to a sixth embodiment of the present invention.

FIG. 9 is a flowchart illustrating an operation according to the sixth embodiment of the present invention.

FIG. 10 is a flowchart for explaining an operation according to the seventh embodiment of the present invention.

FIG. 11 is a flowchart for explaining an operation according to the eighth embodiment of the present invention;

FIG. 12 is a configuration explanatory view of a vehicle braking device according to a ninth embodiment of the present invention.

FIG. 13 is an external view showing an example of a switch used in Embodiment 9 of the present invention.

FIG. 14 is a flowchart for explaining the operation of the ninth embodiment of the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 brake pedal, 2 brake switch, 3 brake lamp, 4 master cylinder, 5 wheel cylinder, 6, 17, 18 braking holding force control means, 7 pressure sensor, 8 brake operation detection means, 9 accelerator operation detection means, 10 vehicle speed sensor , 11 stop detection means, 12
Brake actuator driving means, 13 Brake actuator, 14 Throttle actuator driving means, 15 Stopping brake control means, 16 Throttle actuator

Claims (15)

[Claims] 1. A brake holding force control means having a braking operation detecting means for detecting a braking operation and a braking force of a vehicle and a stop detecting means for detecting a stop of the vehicle, and outputs the outputs of the braking operation detecting means and the stopping detecting means. When detecting and determining that the vehicle has been stopped by the braking operation, an actuator driving means for driving a brake actuator to maintain a predetermined braking force in accordance with a command of the braking holding force control means is provided. The braking force to be instructed is configured to be retained even after the brake pedal is returned while the vehicle is stopped until a signal by a predetermined braking force release operation is input to the braking holding force control means. Vehicle braking device. 2. The vehicular braking apparatus according to claim 1, wherein the braking force applied and held while the vehicle is stopped is held at the time of stopping the vehicle by the braking operation or immediately before the vehicle stops. 3. The vehicle braking device according to claim 1, wherein the braking force applied and held while the vehicle is stopped is set to a value that keeps the vehicle stopped on a predetermined slope. 4. A brake force holding state is released in a braking force holding state by detecting that an accelerator operation reaches an operation amount exceeding a predetermined value. Item 4. The vehicle braking device according to any one of items 3. 5. The brake force holding state according to claim 1, wherein when the accelerator operation is continued for a predetermined time, the holding of the braking force is released. The vehicle braking device according to claim 1. 6. A braking force holding state is released by detecting that a change rate (change speed) of an accelerator operation falls within a range of a preset reference value in a braking force holding state. The vehicle braking device according to any one of claims 1 to 3, wherein: 7. In the braking force holding state, when an accelerator operation is performed and the accelerator operation does not satisfy the condition for releasing the braking force, the throttle opening does not follow the operation of the accelerator, and the condition for releasing the braking force is satisfied. 7. The vehicular braking apparatus according to claim 1, further comprising a throttle actuator operating means for causing the throttle opening to follow an accelerator operation at a time. 8. The vehicle braking device according to claim 7, wherein the throttle opening follows the accelerator operation in synchronization with the release of the braking force. 9. The vehicle according to claim 7, wherein the throttle opening is limited to a predetermined value until the throttle opening follows the accelerator operation after detecting the accelerator operation. Braking device. 10. The braking force holding state is released by detecting that the operation of the brake pedal has reached an operation amount exceeding a predetermined value in the braking force holding state. The vehicle braking device according to any one of claims 1 to 3, wherein: 11. In the braking force holding state, it is configured to detect that the operation of the brake pedal has been continued for a predetermined time and release the state of holding the braking force by the braking holding force control means. The vehicle braking device according to any one of claims 1 to 3. 12. A state in which the braking force is held by the braking force control means by detecting that the rate of change (change speed) of the operation of the brake pedal falls within a range of a preset reference value in the state of holding the braking force. The vehicle braking device according to any one of claims 1 to 3, wherein the vehicle braking device is configured to cancel the braking force. 13. The braking force holding state is released by detecting that any switch near the console box has been operated in the braking force holding state. The vehicle braking device according to any one of claims 1 to 3. 14. The vehicle braking device according to claim 13, wherein the holding of the braking force is released by detecting that the switch operation has been continuously performed for a predetermined time. 15. The vehicular braking device according to claim 13, wherein the operated switch is an operation switch for a constant-speed traveling device.