JPH11189132A - Brake control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve safety at the time of stopping a vehicle by automatically setting the positive braking state of the vehicle even in the case of the operation of a parking brake being in an insufficient state when operation based on a vehicle stop intention is performed using an ABS and a slope start auxiliary device. SOLUTION: When a logical condition indicated by vehicle speed, a shift gear position and whether to operate a parking brake is materialized, a brake control signal is generated. An ABS actuator is started by this brake control signal to intesify braking pressure, and when the braking paressure becomes the specified value, a brake holding value of a slope start auxiliary device is closed to hold the braking pressure. There is therefore no need to separately provide a pump for intensifying braking pressure and a holding valve for holding the braking pressure, and brake control can be economically realized using a device equipped at a vehicle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention is applied to automobiles. Although the present invention has been developed for use in large or medium-sized commercial vehicles, it can be widely used for products other than commercial vehicles. The present invention relates to improving driving safety, and more particularly to an improvement for improving the reliability of a parking brake.

[0002]

2. Description of the Related Art When a driver forgets to operate a parking brake and tries to leave a driver's seat, an alarm sound is generated to alert the driver. . If the driver parks
If the brake is intended to be operated but the operation is insufficient, the parking brake lamp may be turned on and the above-mentioned alarm device may not operate. However, such insufficient operation may cause the vehicle to start moving against the driver's intention.

[0003] As a safety device for automatically increasing the brake pressure in response to an uncertain operation in which the parking brake is not sufficiently applied, a technique disclosed in Japanese Patent Application Laid-Open No. Hei 8-1980071 is known. I have. This device is a safety device that automatically pressurizes the normal service brake fluid pressure to a braking state when the parking brake is operated and the parking brake lamp is lit. The prior art describes that a pump or an on-off valve for increasing the fluid pressure is provided independently for the safety device.

On the other hand, as a brake device for an automobile, AB
S (Antilock Break System) has spread widely. When the brake pressure increases while the vehicle is running and slips between the wheels and the road surface and the wheels are temporarily locked, the device automatically applies the brakes to the brake cylinders of the wheels. This is a device that repeatedly controls the increase and decrease of the applied brake pressure in a short cycle. This ABS
Has been equipped not only in large vehicles but also in small passenger vehicles as a device for improving the steering performance during braking. A
The BS is equipped with an independent actuator for increasing the brake pressure.

[0005] Slope start assist devices have become widespread as brake devices for automobiles. This device is, for example, a device disclosed in Japanese Patent Application Laid-Open No. 4-244462. In this slope start assist device, after the driver depresses the brake pedal and the vehicle stops, the clutch pedal is depressed, the transmission gear is engaged in the start gear or the reverse gear, and then the foot is released from the brake pedal. Also, the brake pressure applied to the brake cylinder of the wheel is maintained as it is. Then, when the clutch pedal is released to a predetermined position, the brake pressure is controlled to be automatically released. That is, the slope start assist device includes a brake holding valve for holding the brake pressure, and means for closing the brake holding valve by an electric signal to hold the brake pressure.

[0006]

The ABS and the slope start assist device as described above have been mounted on both medium and large commercial vehicles (bus trucks).

The present invention has been made in view of such a background, and an object of the present invention is to improve driving safety.
An object of the present invention is to improve driving safety by utilizing the ABS and the slope start assist device, respectively, for purposes other than their intended uses. That is, an object of the present invention is to improve the safety by automatically setting the vehicle to a braking state when the driver performs an operation based on the intention to stop. According to the present invention, when the driver operates the parking brake for a time, but leaves the driver's seat despite insufficient operation, the brake pressure of the wheel is automatically increased. It is intended to provide a device. An object of the present invention is to provide a device in which a vehicle does not move when a driver is not present. The present invention
An object of the present invention is to provide such a safety device at low cost without providing a special pressure valve or a special pressure pump.

[0008] The present invention does not provide an automatic device replacing the parking brake. The present invention is merely an auxiliary device for improving safety.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a driver stops a vehicle using an actuator provided on an ABS for increasing a brake pressure and a brake holding valve provided on a slope start assist device for holding the brake pressure. In the case of intentional braking, the braking is ensured, and when the driver operates the parking brake and the operation is insufficient, the brake pressure is increased to ensure the braking state. It is characterized by the following.

That is, the present invention provides a brake control device for a vehicle equipped with both an ABS and a hill start assist device, a means for generating a brake control signal based on a logical condition, and activating the ABS actuator by the brake control signal. Means for increasing the brake pressure by
Means for closing the brake holding valve of the slope start assist device when the brake pressure reaches a predetermined value to hold the brake pressure.

The logical condition is that the vehicle speed is zero, the transmission gear is in the neutral position, and that the parking brake is operated at the same time, or that the transmission gear is in the neutral position. ,
The condition that the parking brake is operated and the vehicle speed that was zero at the time when the parking brake was operated is no longer zero, or that the vehicle speed is zero, In the neutral position, the parking brake has been applied,
And that the operating force of the parking brake is insufficient.

A brake control signal is generated when logical conditions indicated by the vehicle speed, the transmission gear position, and the presence or absence of a parking brake operation are generated, and the brake control signal activates the ABS actuator to increase the brake pressure. When the brake pressure reaches a predetermined value, the brake holding valve of the slope start assist device is closed to hold the brake pressure.

The first of the logical conditions is that the vehicle speed is zero,
The transmission gear is in the neutral position and the parking
The condition is that the brakes are operated at the same time. This condition indicates that the driver has performed the braking operation with the intention of stopping the vehicle.

The second of the logical conditions indicates that the transmission gear is in the neutral position and the parking brake has been operated, and that the vehicle speed that was zero when the parking brake was operated is no longer zero. Are satisfied at the same time. This condition indicates that the vehicle has started to move for some reason when the vehicle stops on a steep slope.

The third logical condition is that the vehicle speed is zero, the transmission gear is in the neutral position, the parking brake is operated, and the operating force of the parking brake is insufficient. Are satisfied at the same time. This condition is determined by the driver
This indicates that the lever operation was not performed reliably.

When these conditions are satisfied, the brake pressure supplied to the brake cylinder of the wheel by the ABS and the slope start assist device is automatically increased, and the brake pressure is maintained. When the driver performs a braking operation based on the intention of stopping, the braking state of the vehicle is automatically secured. As a result, the driver operates the parking brake for a while, but even when he leaves the driver's seat despite the inadequate operation of the parking brake, complete braking is maintained, improving safety when the vehicle is stopped Can be done.

The present invention does not require a special pump for increasing the brake pressure and a special brake holding valve for holding the brake pressure, as compared with the conventional apparatus described above. However, it is realized by using the ABS actuator and the brake holding valve of the slope start assist device which are already equipped. According to the present invention, such an apparatus can be provided at low cost. According to the present invention, it is possible to provide a device equivalent to the conventional device while reducing the economic burden on the user.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

[0019]

Next, an embodiment of the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 1 is a block diagram showing a configuration of a main part of a first embodiment of the present invention.

In the first embodiment of the present invention, the ABS 2 for stabilizing the steering performance during braking by repeatedly increasing and decreasing the brake pressure at high speed under the control of the control circuit 1, and for maintaining and controlling the brake pressure when starting on a slope. A hill start assist device 3 that automatically releases the vehicle and starts the vehicle in a stable state is provided.

The ABS 2 has a program control circuit 4 and
An ABS / ASR actuator 5 is included, and the slope start assist device 3 includes a program control circuit 6 and a brake holding valve 7.

The program control circuit 4 of the ABS 2 is provided with means for generating a brake control signal based on a logical condition, and means for activating the ABS / ASR actuator 5 by this brake control signal to increase the brake pressure. When the brake pressure reaches a predetermined value by the ABS / ASR actuator 5, the program control circuit 6 of the slope start assist device 3 has a brake holding valve 7
And means for closing the brake pressure to maintain the brake pressure.

The control circuit 1 has a vehicle speed sensor 11, a neutral switch 12,
Outputs of the parking switch 13 and the parking operation force sensor 14 are connected, and further, a clutch hydraulic switch, a brake sensor, a clutch sensor, an engine key switch, and a rotation required for control performed by the ABS 2 and the slope start assist device 3. Outputs of a sensor, a gradient sensor, a gravitational acceleration sensor, a load sensor, and the like are connected.

Next, the operation of the first embodiment of the present invention configured as described above will be described.

The program control circuit 4 of the ABS 2 controls the ABS / ASR actuator 5 under the control of the control circuit 1 to increase or decrease the brake pressure. Further, the program control circuit 6 of the slope start assist device 3 controls the brake holding valve 7 according to the control of the control circuit 1 to hold and release the brake pressure.

In the first embodiment of the present invention, the parking brake control is performed on the assumption that the vehicle speed is zero, the transmission gear is in the neutral position, and that the parking brake is operated. Is performed.

FIG. 2 is a flowchart showing the flow of the brake control operation in the first embodiment of the present invention.

The control circuit 1 takes in the output of the vehicle speed sensor 11 and determines whether or not the vehicle speed is zero. If the vehicle speed is zero, take in the output of the neutral switch 12,
It is determined whether the transmission gear of the transmission is at the neutral position. If the transmission gear is in the neutral position, the output of the parking switch 13 is taken in, and it is determined whether or not a parking lever (not shown) is operated. If the parking lever is operated, all the logical conditions are satisfied at the same time, and the control signal is sent to the program control circuit 4 of the ABS 2 on the assumption that the parking state is established.

The program control circuit 4 sends a brake control signal to the ABS / ASR actuator 5 in accordance with the control signal to increase the brake pressure. When the brake pressure reaches a predetermined value, the hill start assist device is activated. 3 to send a control signal.

In accordance with this control signal, the program control circuit 6 of the hill start assist device 3 controls the brake holding valve 7
To hold the brake pressure by closing the brake holding valve 7.

When the vehicle speed is zero, the shift gear is in the neutral position, and at least one of the conditions indicating that the parking brake is operated is not satisfied, the braking operation by the driver is performed. As a result, the braking operation by the ABS 2 and the slope start assist device 3 is not performed.

In the case of the first embodiment, if the parking lever is operated while the vehicle speed is indicated to be zero and the transmission gear is indicated to be in the neutral position,
Even if the operation force is insufficient, a reliable braking state is set by the ABS 2 and the slope start assist device 3.

(Second Embodiment) A second embodiment of the present invention is shown in FIG.
And the speed change gear is in the neutral position, the parking brake is operated, and the vehicle speed that was zero at the time the parking brake was operated is no longer zero. The parking brake control is performed under the logical condition that the above conditions are satisfied at the same time.

FIG. 3 is a flowchart showing the flow of the brake control operation in the second embodiment of the present invention.

As in the first embodiment, the control circuit 1 takes in the outputs of the vehicle speed sensor 11, the neutral switch 12, and the parking switch 13, and the vehicle speed is zero.
The transmission gear is in the neutral position and the parking
If the brake is operating, the vehicle speed sensor 1
1 is fetched, and it is determined whether or not the vehicle speed is not zero in that state.

If the vehicle speed is not zero, it indicates that the vehicle is starting to move even though the vehicle is stopped, so that the ABS 2 and the hill start assist device 3 are controlled as in the first embodiment. Then, the ABS / ASR actuator 5 is activated to increase the brake pressure, and when the brake pressure reaches a predetermined value, the brake holding valve 7 is closed to hold the brake pressure to ensure the braking state.

In the case of the second embodiment, after the parking brake operation is performed, the start of movement of the vehicle is detected, and it is determined that the braking is insufficient based on the start of the movement, and a reliable braking state is set. .

(Third Embodiment) A third embodiment of the present invention is shown in FIG.
The vehicle speed is zero, the transmission gear is in the neutral position, the parking brake is operated, and the operation force of the parking brake is insufficient. Is applied as a logical condition to perform parking brake control.

FIG. 4 is a flowchart showing the flow of the brake control operation in the third embodiment of the present invention.

As in the first embodiment, the control circuit 1 takes in the outputs of the vehicle speed sensor 11, the neutral switch 12, and the parking switch 13, and the vehicle speed is zero.
The transmission gear is in the neutral position and the parking
If the brake is being operated, the output of the parking operation force sensor 14 is taken in, and it is determined whether or not the parking lever is reliably operated and the parking operation force is sufficient.

If the parking operation force is insufficient, as in the first embodiment, the ABS / ASR actuator 5 is activated to increase the brake pressure, and when the brake pressure reaches a predetermined value, the hill start assistance is increased. The brake holding valve 7 of the device 3 is closed to hold the brake pressure to ensure the braking state.

In the case of the third embodiment, it is detected whether or not the operation of the parking lever is insufficient, and when it is insufficient, the braking state is reliably set.

[0044]

As described above, according to the present invention, as an auxiliary device for the parking brake when the vehicle is stopped, A
Using the BS and the slope start assistance device, when the driver performs an operation based on the intention of stopping, the reliable braking state of the vehicle can be automatically set, and the safety at the time of stopping can be improved. . This allows the driver to
Even if the brakes are operated for the time being but the driver leaves the driver's seat even though the operation is inadequate, the brake pressure on the wheels is automatically increased to ensure safety .

Since this device uses a device already installed in the vehicle, it is not necessary to provide a special brake pressure holding valve and a special pressure pump as compared with the above-described conventional device, and the same device is used. A device having the above performance can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a main part of a first embodiment of the present invention.

FIG. 2 is a flowchart showing a flow of a brake control operation in the first embodiment of the present invention.

FIG. 3 is a flowchart showing a flow of a brake control operation in a second embodiment of the present invention.

FIG. 4 is a flowchart showing a flow of a brake control operation according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Control circuit 2 ABS 3 Slope start assist device 4, 6 Program control circuit 5 ABS / ASR actuator 7 Brake holding valve 8 Interface circuit 11 Vehicle speed sensor 12 Neutral switch 13 Parking switch 14 Parking operation force sensor

Claims (4)

[Claims] 1. An anti-lock brake system (An)
a tilock break system (hereinafter referred to as "ABS") and a vehicle brake control device equipped with a slope start assist device, wherein a means for generating a brake control signal according to a logical condition;
A means for increasing the brake pressure by activating the ABS actuator by the brake control signal, and closing the brake holding valve of the slope start assist device when the brake pressure reaches a predetermined value to hold the brake pressure. A brake control device. 2. The logical condition is that the vehicle speed is zero.
2. The brake control device according to claim 1, wherein the condition that the transmission gear is in the neutral position and the operation of the parking brake are simultaneously satisfied. 3. The logical condition is that the transmission gear is in a neutral position, that a parking brake is operated, and that the vehicle speed that was zero when the parking brake was operated is no longer zero. The brake control device according to claim 1, wherein the conditions are satisfied at the same time. 4. The logical condition that the vehicle speed is zero,
Check that the transmission gear is in the neutral position,
The brake control device according to claim 1, wherein the condition that the brake is operated and the operation force of the parking brake is insufficient are simultaneously satisfied.