JPH0542861A - Braking device of vehicle - Google Patents

Abstract

PURPOSE:To shorten free running distance of a vehicle to improve braking performance and speed reduction performance. CONSTITUTION:An actuator 17 to depress and actuate a brake pedal 2 and an electromagnetic opening/closing valve 19 to control the actuation of the actuator 17 are arranged around the brake pedal 2. Based on the depressing degree of an accelerator pedal 1, the opening operation of the accelerator pedal 1 is detected by the output signal from a throttle valve opening degree sensor 25, and the opening/closing valve 19 is controlled by a controller 22 during this opening operation, and the brake pedal 2 is depressed and actuated by the actuator 17. With this constitution, automatic braking force can be exerted in an early stage, that is, before the driver actually depresses the brake pedal, and in a vehicle provided with an automatic transmission 27, even if the torque converter slides, the engine brake is practically applied, improving the speed reduction performance of the vehicle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a vehicle braking system,
In particular, the present invention relates to an improvement of a vehicle that automatically applies a braking force to a vehicle without the driver depressing the brake pedal.

[0002]

2. Description of the Related Art Conventionally, as a braking device for a vehicle of this type, for example, as disclosed in Japanese Utility Model Laid-Open No. 61-72464, a manual switch for instructing the action of a brake is arranged around the driver's seat. It is known that a driver operates a brake device of a vehicle when the driver operates the manual switch, so that the driver can easily stop the vehicle without depressing the brake pedal.

[0003]

By the way, when the driver depresses the brake pedal, there is a delay time from the time when the driver releases the accelerator pedal to the time when he puts his foot on the brake pedal. However, there was a feeling that the braking performance was substantially low by the free running distance corresponding to the delay time. Also, in vehicles equipped with an automatic transmission, even when the driver requests deceleration operation with the accelerator pedal released, the effect of engine braking is low due to the sliding action of the torque converter, so deceleration performance is reduced. There was some disappointment.

The present invention has been made in view of the above problems, and its object is to utilize the technique of automatically applying a braking force as described in the above publication, until the driver places his foot on the brake pedal. The braking force is automatically applied during the delay time to improve braking performance, and the braking force is automatically applied when the driver releases the accelerator pedal in a vehicle equipped with an automatic transmission. The purpose is to improve deceleration performance. In that case, it is desirable that the braking force to be automatically applied be a force corresponding to the operation speed of the driver's accelerator pedal opening operation, in accordance with the driver's intention to brake or decelerate.

[0005]

In order to achieve the above object, according to the present invention, when the driver releases the accelerator pedal, an appropriate value of the braking force is automatically applied early from this point. The configuration.

That is, as a concrete solution means of the invention according to claim 1, as shown in FIG. 1, an actuator 17 for depressing the brake pedal 2 is provided, and the accelerator pedal 1 is depressed from the depressed state. Release detecting means 30 for detecting a release operation of the depression of the pedal, return speed calculating means 31 for calculating the return speed of the accelerator pedal 1 detected by the release detecting means 30, and the above-mentioned return speed calculating means 31. At the time of releasing the accelerator pedal 1 detected by the release detecting means 30, the control means 32 for controlling the actuator 17 so as to apply the braking force according to the return speed of the accelerator pedal 1 calculated by the return speed calculating means 31. And are provided.

Further, in the invention described in claim 2, the control means of the invention described in claim 1 is limited, and the control of the actuator is released by the depression operation of the brake pedal by the driver.

Further, in the invention described in claim 3, the control means is limited to the one different from the above, and the control of the actuator is released after a lapse of a set time from the start of the control.

In addition, in the invention according to claim 4, the actuator is specified and the brake pedal of the vehicle equipped with the automatic transmission is depressed to be actuated.

Further, in the invention described in claim 5, in addition to the configuration of the invention described in claim 1, further, a depression amount detecting means for detecting the depression amount of the accelerator pedal, and the depression amount detecting means and the release detecting means. And a correction means for correcting the control of the actuator by the control means so as to increase the braking force when the amount of depression of the accelerator pedal immediately before the release of the accelerator pedal is large.

[0011]

With the above construction, in the invention of claim 1,
When the driver releases the accelerator pedal 1, the actuator 17 is controlled by the control means 32 immediately after the release operation, and the automatic braking force is applied to the vehicle early from the stage before the driver depresses the brake pedal 2. Is applied, the braking performance of the vehicle is improved accordingly.

In this case, according to the second aspect of the present invention, when the driver starts the operation of depressing the brake pedal, the control of the actuator is stopped at this point, and the desired braking force according to the operation of the driver is performed. Since only the brake pedal operates, the braking performance as requested by the driver can be obtained. In addition, claim 3
In the invention described above, the control of the actuator is stopped if the set time is continued, so that the braking performance as requested by the driver can be obtained in accordance with only the depression operation of the brake pedal by the driver, as described above.

Further, according to the fourth aspect of the invention, even when the driver releases the accelerator pedal, the engine brake is hard to act due to the sliding action of the torque converter of the automatic transmission. Since the braking force is automatically applied by the control of, the deceleration performance of the vehicle is improved accordingly.

Further, according to the invention described in claim 5, when the accelerator pedal is released in a situation where the accelerator pedal is largely depressed, the driver is trying to decelerate significantly. As a result, the control of the control means is corrected and the automatic braking force by the actuator is increased, so that deceleration performance that meets the driver's request can be obtained.

[0015]

As described above, according to the braking device for a vehicle of the invention described in claim 1, the braking action from the time when the driver starts the operation of releasing the accelerator pedal to the step of depressing the brake pedal. Since the automatic braking force can be applied early during the delay time, the braking performance of the vehicle can be improved.

According to the second and third aspects of the present invention, when the driver is stepping on the brake pedal, the action of the automatic braking force due to the operation of the actuator is stopped, and the driver is stopped. Only the desired braking force acts only by operating the brake pedal, and the braking performance as requested by the driver can be obtained.

Further, according to the invention described in claim 4, even in a vehicle equipped with an automatic transmission, when the driver releases the brake pedal, the automatic operation by the actuator is performed regardless of the sliding action of the torque converter. Due to the action of the brake, the engine brake substantially acts and the deceleration performance is improved.

In addition, according to the invention of claim 5, when the large depressing amount of the accelerator pedal is required and a large deceleration performance is required when the accelerator pedal is released, the control of the actuator is corrected so as to increase the braking force. Therefore, the deceleration performance that meets the driver's request can be obtained.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

2 and 3, reference numeral 1 is an accelerator pedal, 2 is a brake pedal, and the accelerator pedal 1 is linked via a wire 3 to a throttle valve 5 arranged in an intake passage 4 of the engine. The throttle valve 5 is opened according to the stepping operation.

On the other hand, as shown in FIG. 3, the brake pedal 2 swings on a member 10 whose upper end projects from the dash panel 9 partitioning the engine compartment 7 and the compartment 8 toward the compartment 8. The push rod 12a of the brake master back 12 arranged in the engine room 7 is coupled to the upper part of the brake master cylinder 12 while being mounted movably, and the brake master cylinder 13 is arranged in the rear stage of the master back 12. Although not shown, the hydraulic pressure generated in 13 is supplied to the wheel cylinder of each wheel.

An actuator 1 for depressing the pedal 2 is provided around the upper portion of the brake pedal 2.
7 is placed. The actuator 17 is the member 10
Is fixed to another member 11 extending downward from the diaphragm 17a, and its operation system is a diaphragm type.
The operating rod 17b is connected to the operating rod 17b.
Is linked to the upper end of the brake pedal 2.
Further, a negative pressure chamber 17c is provided inside by a diaphragm 17a.
And a negative pressure passage 18 communicates with the negative pressure chamber 17c. Although not shown, the negative pressure passage 18 is communicated with the intake passage 4 on the downstream side of the throttle valve 5, and an electromagnetic opening / closing valve 19 is provided in the middle of the negative passage 18, so that when the opening / closing valve 19 is opened, the intake negative pressure is reduced. Is introduced into the negative pressure chamber 17c, and the diaphragm 17
By biasing a to the brake pedal 2 side, the brake pedal 2 is operated by its operation rod 17b.

Reference numeral 22 denotes a controller having a CPU or the like built therein, which controls opening / closing of the electromagnetic opening / closing valve 19 and detection of an opening sensor 25 for detecting the opening of the throttle valve 5. A signal, a detection signal of a vehicle speed sensor (not shown), and a range position signal of the selection lever 26 arranged in the vehicle compartment are input, and further incorporated in a hydraulic control circuit (not shown) of an automatic transmission 27 mounted on the vehicle. ON / OFF control and duty control of various solenoid valves. The opening degree sensor 25 functions as a depression amount detecting means for detecting the depression amount of the accelerator pedal 1 based on the opening degree of the throttle valve 5.

Next, the control of the actuator 17 by the controller 22, that is, the automatic brake control will be described based on the control flow of FIG. The control flow starts only when the selection lever 26 selects the D range (automatic shift from the first speed to the fourth speed). Then, in step S1, based on the output signal of the opening sensor 25, it is detected whether the opening of the throttle valve 5 is changed from the open state to the fully closed state, thereby detecting whether or not the accelerator pedal 1 is released from the depressed state. To do. Only when the release operation is performed, the return speed of the accelerator pedal 1 is calculated from the closing speed of the opening of the throttle valve 5 based on the output signal of the opening sensor 25 in step S2, and the return speed and the vehicle speed are calculated. Based on the vehicle speed input from the sensor, the brake amount Bt is calculated from the brake amount map shown in the same step. In this brake amount map, the brake amount Bt is set larger as the return speed of the accelerator pedal 1 becomes faster and the vehicle speed becomes higher. Next, in the same step, the opening sensor 25
Based on the output signal of the accelerator pedal 1, the amount of depression of the accelerator pedal 1 immediately before the release operation of the accelerator pedal 1, that is, the accelerator opening Acc is input, and the correction coefficient of the brake amount Bt is input according to the value of the accelerator opening Acc. Ac is selected from the four regions shown in the same step, and the brake operation amount BT is calculated by the formula, B
It is calculated by T = Bt × Ac. Here, the correction coefficient Ac is set to a larger value in a region in which the accelerator opening Acc is larger.

Then, in step S3, the opening / closing valve 19 is controlled to be opened / closed so that the brake operation amount BT calculated above is obtained, and the depression amount of the brake pedal 2 by the actuator 17 is controlled.

Thereafter, in step S4, the brake pedal 2 is depressed by the driver based on the output of a sensor or the like which detects that the depression amount of the brake pedal 2 is equal to or greater than the maximum depression amount based on the operation of the actuator 17, for example. It is determined whether or not the brake is being turned on under the above circumstances, and whether or not a set time has elapsed since the control of the actuator 17 was started in step S3 in step S5, and when the brake is turned on or the set time has elapsed If so, the automatic brake control by the actuator 17 is canceled and the process returns.

Therefore, in the control flow of FIG.
In step S1, the release detection means 30 is configured to detect the release operation of the accelerator pedal 1 from the depressed state of the accelerator pedal 1 based on the change in the throttle valve opening signal value of the opening sensor 25. At the same time, in step S2, the accelerator pedal 1 is released during the release operation of the accelerator pedal 1 detected by the release detection means 30.
Return speed calculation means 31 for calculating the return speed of
Are configured. Further, in step S3 of the control flow, during the release operation of the accelerator pedal 1 detected by the release detecting means 30, the brake operation amount Bt is set according to the return speed of the accelerator pedal calculated by the return speed calculating means 31. The control means 32 is configured to calculate and control the actuator 17 so that the braking force corresponding to the actuation amount Bt is applied. Further, in step S2 of the control flow, the output of the depression amount detecting means (opening degree sensor 25) and the release detecting means 30 is received, and the depression amount of the accelerator pedal immediately before the release operation of the accelerator pedal 1, that is, the accelerator opening degree. The larger Acc is,
The correction coefficient Ac is set to a large value, whereby the brake operation amount BT is largely corrected, and the control means 32 corrects the control of the actuator 17 so as to increase the braking force.

Therefore, in the above-described embodiment, when the driver releases the accelerator pedal 1 from the running state in which the accelerator pedal 1 is depressed, the automatic braking amount Bt is calculated in the controller 22 and the calculated value is calculated. The actuator 17 operates so as to obtain the braking force corresponding to, and the brake pedal 2 is depressed. As a result, as shown in FIG. 5, the braking force is applied early in the stage before the driver depresses the brake pedal 2, so that the idling distance of the vehicle is shortened and the vehicle is good even with a short braking distance. Stop at.

Moreover, the brake amount Bt is set to a large value when the return speed of the accelerator pedal 1 is fast, that is, when the driver requests a large deceleration, and therefore the degree of the driver's deceleration request. A braking force that conforms to is obtained, and braking performance that is appropriate and has a good driving feeling can be obtained.

Further, when the depression amount immediately before the release operation of the accelerator pedal 1 is large, the return amount of the accelerator pedal 1 is large, and short distance braking is further required.
In this situation, the correction coefficient Ac for the braking force is set to a large value, and the braking operation amount BT is multiplied by that amount to increase the braking force, so that good and large braking performance that matches this situation can be obtained.

In addition, the automatic brake control by the operation of the actuator 17 is forcibly released when the driver actually depresses the brake pedal 2 or when a set time elapses after the automatic brake control is started. Therefore, after the release, only the braking force by the driver's operation of depressing the brake pedal 2 acts, and the vehicle is decelerated as requested by the driver.

Further, even when the driver releases the accelerator pedal 1 to decelerate, the engine braking is not exerted so much due to the sliding action of the torque converter of the automatic transmission 27, but the actuator 1 is as described above.
An automatic braking force acts on the wheels by the automatic depression operation of the brake pedal 2 by the operation of 7. Therefore, the engine brake corresponding to this acts substantially, and the deceleration performance of the vehicle equipped with this automatic transmission is enhanced.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an invention according to claim 1.

FIG. 2 is a perspective view around an accelerator pedal.

FIG. 3 is a side view around the accelerator pedal.

FIG. 4 is a flowchart showing automatic brake control.

FIG. 5 is an operation explanatory view.

[Explanation of symbols]

 1 Accelerator Pedal 2 Brake Pedal 17 Actuator 19 Electromagnetic Open / Close Valve 22 Controller 25 Opening Sensor (Stepping Depth Detecting Means) 27 Automatic Transmission 30 Release Detecting Means 31 Return Speed Calculating Means 32 Control Means 33 Correcting Means

Claims (5)

[Claims] 1. A release detecting means for detecting when a release operation of the accelerator pedal is released from an accelerator pedal depressed state, and an accelerator pedal detected by the release detecting means. And a return speed calculation means for calculating the return speed of the accelerator pedal during the release operation of the accelerator pedal, and a release speed calculation means calculated by the return speed calculation means during the release operation of the accelerator pedal detected by the release detection means. And a control means for controlling the actuator so that a braking force is exerted on the vehicle. 2. The control of the actuator by the control means comprises:
The vehicle braking system according to claim 1, wherein the braking system is released by a driver's operation of depressing a brake pedal. 3. The control of the actuator by the control means,
The braking device for a vehicle according to claim 1, wherein the braking is released after a set time has elapsed from the start of the control. 4. The braking device for a vehicle according to claim 1, wherein the actuator operates by depressing a brake pedal of a vehicle equipped with an automatic transmission. 5. A brake when the amount of depression of the accelerator pedal is large immediately before the accelerator pedal is released by receiving the output of the amount of depression detecting means for detecting the amount of depression of the accelerator pedal and the output of the depression amount detecting means and the release detecting means. The braking device for a vehicle according to claim 1, further comprising a correction unit that corrects the control of the actuator by the control unit so as to increase the force.