JPH0550900A - Electronic control device for anti-lock brake for vehicle - Google Patents

Abstract

PURPOSE:To prohibit confirmation of actuator action when a vehicle stops on a slope with an inclination not less than a predetermined angle. CONSTITUTION:An electronic control device 4 for an anti-lock brake for a vehicle composed so that confirmation of action of an actuator 3 is implemented when an engine 2 is started by operating an ignition switch 1 is provided with an inclination angle detecting means 5 which detects an inclination angle of car body, a judging means 6 which identifies that the inclination angle detected by the inclination angle detecting means 5 is not less than a preset value, and a prohibiting means 7 which prohibits the implementation of action identified by the judging means 6 to be not less than the preset value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic control unit for a vehicle antilock brake device.

[0002]

2. Description of the Related Art In an electronic control unit for a vehicle anti-lock brake system, as shown in, for example, Japanese Patent Publication No. 48-37953, operation confirmation of an actuator is confirmed when an engine is started by operating an ignition switch. There is one configured to execute (act of confirming that the actuator operates normally and ABS can be controlled).

[0003]

By the way, in the above-mentioned conventional apparatus, when the engine is started, the operation of the actuator is automatically confirmed regardless of the state of the vehicle body, so that the vehicle stops on a slope. However, when the brake fluid pressure is applied to the wheel cylinders by the foot brake to stop the vehicle, the brake fluid pressure may be temporarily reduced by the check operation of the actuator, and the vehicle may start moving. The present invention has been made to solve the above-described problem, and an object thereof is to prohibit the confirmation of the operation of the actuator when the vehicle is stopped on a slope having a set gradient or more.

[0004]

In order to achieve the above-mentioned object, in the present invention, as shown in FIG. 1, the actuator is actuated when the engine 2 is started by operating the ignition switch 1. In the electronic control unit 4 of the vehicle anti-lock brake device configured to execute the operation confirmation of No. 3, the inclination detection unit 5 for detecting the inclination of the vehicle body, and the inclination detection unit 5 detects the inclination. A discriminating means 6 for discriminating that the inclination of the vehicle body is equal to or larger than a set value, and a prohibiting means 7 for inhibiting execution of the operation confirmation when the discriminating means 6 discriminates that the inclination of the vehicle body is equal to or larger than the set value. Was established.

[0005]

In the electronic control unit for the vehicle anti-lock brake device according to the present invention, when the inclination of the vehicle body is equal to or greater than the set value, the inclination degree of the vehicle body detected by the inclination degree detecting means 5 is set. When it is determined by the determination means 6 that the value is equal to or more than the value, the inhibition means 7 inhibits the execution of the operation confirmation of the actuator 3. Therefore, when the vehicle is stopped on a slope with a set inclination or higher and the brake fluid pressure is applied to the wheel cylinders by the foot brake to stop the vehicle, the engine 2 is started by operating the ignition switch 1. However, the operation confirmation of the actuator 3 is not executed, and it is possible to prevent the vehicle from moving due to the abrupt decrease in the brake fluid pressure that occurs due to the operation of the actuator 3.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 schematically shows a vehicle anti-lock brake system equipped with an electronic control unit according to the present invention.
In this device, master cylinder 11 and booster 1
The brake fluid pressure generating device 10 which is composed of 2 and the reservoir 13 and is operated by depressing the brake pedal 14 is connected to the wheel cylinders 21, 22, 23 and 24 arranged on the wheels FR, FL, RR and RL. The pumps 31a and 31b, the reservoirs 32a and 32b, and the electromagnetic on-off valves 33a to 36a and 33 are provided in the two-system diagonal hydraulic circuits.
A well-known actuator 30, which is composed of b to 36b and whose operation is controlled by an electronic control unit 40, is interposed.
Both pumps 31a and 31b are a single electric motor 37.
Is configured to be driven by. Moreover, since the configuration and function of the actuator 30 are clear from the drawings, description thereof will be omitted.

The electronic control unit 40 includes wheels FR, FL,
Each wheel speed sensor 41, 4 arranged in RR and RL
2, 43, 44, a brake switch 45 (a switch that is turned on when a pedaling force is applied to the brake pedal 14), and a vehicle body G sensor 46 are connected, and each electromagnetic opening / closing valve 33a-36a, 33b-36b of the actuator 30 is connected.
The electric motor 37 and the warning lamp 38 are connected to control the actuator 30 according to the road surface condition. Further, as shown in FIG. 3, the electronic control unit 40 includes CPUs commonly connected to the buses 47a.
The microcomputer 47 includes a microcomputer 47b, a ROM 47c, a RAM 47d, a timer 47e, an input interface circuit 47f, and an output interface circuit 47g, and outputs signals from the wheel speed sensors 41, 42, 43, 44, the brake switch 45, and the vehicle body G sensor 46. Is input to the input interface circuit 47f through the amplifier circuits 48a to 48f, and the microcomputer 47
Is output to each electromagnetic on-off valve 33a-36a, 33b-36b, the electric motor 37, and the warning lamp 38 via each drive circuit 49a-49j.

ROM 47c of the microcomputer 47
Stores a program corresponding to each of the flowcharts shown in FIGS. 4 and 5, and the CPU 47b responds to the closing of the ignition switch 50 to start the execution of the program and executes the program while the switch 50 is closed. Then, the RAM 47d temporarily stores the variable data necessary for executing the program.

In the present embodiment configured as described above, a series of processing is performed in the electronic control unit 40,
The operation of the actuator 30 is controlled. The operation will be described below with reference to the flowcharts of FIGS. 4 and 5. Microcomputer 4 in electronic control unit 40
The CPU 47b of 7 starts the execution of the program corresponding to the flowcharts of FIGS. 4 and 5 in step 100 in response to the closing of the ignition switch 50. In the execution of such a program, the output of the warning lamp lighting, which is initialized in step 101 and will be described later, is cleared, and various calculated values necessary for the ABS control are cleared.
Then, in step 102, it is determined from the output of a generator (both not shown) driven by the engine whether or not the engine is being driven, and when it is determined as "NO", step 102 is repeatedly executed, and "YES". If it is determined to be “”, the process proceeds to step 103. Also, step 1
At 03, it is judged from the output signal from the vehicle body G sensor 46 whether or not the inclination degree θ of the vehicle body is equal to or greater than the set value A,
When it is determined to be “ES”, the process proceeds to step 104,
When the determination is “NO”, the process proceeds to step 105.

By the way, in step 104, A
It is determined whether or not the condition for starting the BS control is satisfied. If "NO" is determined, the process returns to step 103, and if "YES" is determined, the process jumps to step 109 shown in FIG. On the other hand, in step 105, an operation confirmation routine for confirming that the actuator 30 operates normally (actuator 30
Each of the electromagnetic on-off valves 33a to 36a, 33b to 36 that configure
b) and the electric motor 37 are sequentially operated to perform an electrical check), and then, in step 106, the actuator 30 is checked based on the check result of step 105.
Is determined to operate normally, and if "NO" is determined, the process proceeds to step 107 and the actuator 3
A signal is output to the warning lamp 38 indicating that 0 does not operate normally, the warning lamp 38 is kept lit, and “YE
If it is determined to be "S", step 10 shown in FIG.
Go to 8.

In step 108 of FIG. 5, it is determined whether the condition for starting the ABS control is satisfied, as in step 104. If "NO" is determined, step 108 is repeatedly executed and "YES" is determined. If it is determined to be “”, the process proceeds to step 109. Also, step 1
At 09, it is determined whether or not the condition for executing the ABS control is satisfied. When it is determined as "YES", the routine proceeds to step 110, where a known ABS control routine (controlling the operation of the actuator 30 to control each wheel) is performed. After the action of increasing / decreasing the brake fluid pressure applied to the cylinders 21 to 24 while preventing the wheel lock) is performed, the process proceeds to step 111, and when “NO” is determined, the process jumps to step 111. In step 111, it is determined whether or not the ignition switch 50 is ON, and if "YES" is determined, step 10 is performed.
Returning to step 8, when it is judged as "NO", step 11
Proceed to 2 and the execution of the program ends.

As is apparent from the above description, in this embodiment, step 103 is performed when the engine is started.
Is executed, it is determined whether or not the inclination degree θ of the vehicle body obtained based on the output signal from the vehicle body G sensor 46 is equal to or greater than the set value A. For example, when the vehicle is stopped on a flat road, Although it is determined to be “NO” and the confirmation of the operation of the actuator 30 is executed, when the vehicle is stopped on a slope having a set gradient or more, it is determined to be “YES” and the confirmation of the operation of the actuator 30 is prohibited. .. Therefore, when the vehicle is stopped on a slope having a set inclination or higher and the brake fluid pressure is applied to the wheel cylinders 21 to 24 by the foot brake to stop the vehicle, the engine is operated by operating the ignition switch 50. Even if the engine is started, the operation confirmation of the actuator 30 is not executed, and it is possible to prevent the vehicle from moving due to the abrupt decrease of the brake fluid pressure that accompanies the operation of the actuator 30. Also,
In the present embodiment, since it is determined in step 104 whether the condition for starting the ABS control is satisfied after the determination in step 103 is “YES”, the brake is continuously applied from the time when the engine is started. When the vehicle is driven down a slope, the ABS control routine can be executed without checking the operation of the actuator 30, and the wheel lock can be accurately prevented.

In the above embodiment, the vehicle body G sensor included in the vehicle is adopted as the inclination degree detecting means for detecting the inclination degree of the vehicle body so that the vehicle body can be inexpensively implemented. However, the vehicle is provided with the vehicle body G sensor. If not, it is possible to implement the present invention by adopting another inclination detecting means (for example, an inclinometer).

[Brief description of drawings]

FIG. 1 is a block diagram schematically showing an electronic control unit of an antilock brake device for a vehicle according to the present invention.

FIG. 2 is an overall configuration diagram showing an embodiment of a vehicle antilock brake device including an electronic control device according to the present invention.

FIG. 3 is a block diagram showing a configuration of the electronic control device of FIG.

4 is a flowchart of a program executed by the microcomputer of FIG.

5 is a flowchart of a program executed by the microcomputer of FIG.

[Explanation of symbols]

10 ... Braking hydraulic pressure generation device, 21-24 ... Wheel cylinder, 30 ... Actuator, 40 ... Electronic control device, 46
... vehicle body G sensor (inclination detecting means), 50 ... ignition switch, FR, FL, RR, RL ... wheels.

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Kuniaki Okamoto 2-1, Asahi-cho, Kariya city, Aichi Prefecture Aisin Seiki Co., Ltd. (72) Inventor Tsuyoshi Yoshida 2-chome, Asahi-cho, Kariya city, Aichi Prefecture Aisin Seiki Co., Ltd. (72) Inventor Hiroyuki Ichikawa 2-1, Asahi-cho, Kariya city, Aichi Aisin Seiki Co., Ltd. (72) Inventor Hiroyuki Nagai 2-1-1, Asahi-cho, Kariya, Aichi Aisin Seiki Co., Ltd. ( 72) Inventor Shinsaibu No. 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd.

Claims (1)

[Claims] 1. An electronic control unit for an antilock brake device for a vehicle, configured to execute an operation check of an actuator when an engine is started by operating an ignition switch. Degree detecting means, determining means for determining whether the inclination degree of the vehicle body detected by the inclination degree detecting means is greater than or equal to a set value, and this determining means determines that the vehicle body inclination degree is greater than or equal to the set value. An electronic control device for a vehicle anti-lock brake device, characterized in that a prohibiting means for prohibiting execution of the operation confirmation is provided.