JP2900887B2 - Valve check control device for antilock brake mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention controls the brake fluid pressure during sudden braking of a vehicle or braking on slippery road surfaces to prevent wheels from being locked, thereby ensuring a stable vehicle body posture and directional stability. The present invention relates to a valve check control device for an anti-lock brake mechanism.

[0002]

2. Description of the Related Art An anti-lock brake mechanism, which prevents a vehicle from slipping due to the locking of wheels during rapid braking of a vehicle or braking on a slippery road surface, and secures a stable body posture and directional stability, a so-called anti-lock brake mechanism. ABS is conventionally mounted on vehicles. This ABS detects fluctuations in the rotation speed of each wheel during vehicle braking, and automatically controls the brake fluid pressure of each wheel based on the detection result, thereby preventing locking of the wheels.

Therefore, in this ABS, a pair of open / close valves is provided in a master cylinder connected to a brake pedal in a hydraulic circuit for automatically controlling the brake fluid pressure of each wheel. The pair of open / close valves are operated to open / close based on an open / close signal output by a controller. Usually, the open / close state is such that the hydraulic pressure of the master cylinder is directly transmitted to the wheel cylinder to operate the brake. . When the wheels are about to be locked due to sudden braking or the like, the controller outputs an open / close signal to the pair of open / close valves, and the pair of open / close valves opens and closes, depressurizing the wheel cylinders and stopping the brake operation. To prevent the wheels from locking.

Incidentally, such an ABS does not operate frequently, and may not operate for a long period of time unless a sudden braking operation or a braking operation on a slippery road surface is performed. If the ABS is not operated for a long time, the valve bodies in the pair of open / close valves may be fixed to the housing. Therefore, it has been considered to prevent the valve body from sticking by opening and closing the pair of on-off valves irrespective of a sudden braking operation or a braking operation on a slippery road surface. No. 193,661.

The "anti-skid device" disclosed in Japanese Patent Application Laid-Open No. 4-193661 detects that the output of a brake lamp switch has been switched after the ignition switch of the vehicle is turned on, and the brake pedal is released. In a state where it is detected that the pedal is not depressed, a test drive of an opening / closing valve for adjusting the hydraulic pressure of the wheel cylinder is performed. Regardless of sudden braking or braking on slippery roads,
The test drive of the open / close valve prevents the valve body from sticking, and the test drive of the open / close valve is performed in a state where the brake pedal is not depressed. Prevents pleasure.

[0006]

However, in the "anti-skid device" disclosed in Japanese Patent Application Laid-Open No. 4-193661, the output of the brake lamp switch is switched after the ignition switch of the vehicle is turned on. The opening / closing valve that adjusts the hydraulic pressure of the wheel cylinder is test-driven in a state in which it is detected that the brake pedal has not been depressed and that the brake pedal is not depressed. For example, after the ignition switch of the vehicle is turned on, when the shift position of the AT vehicle is moved from the P range to the D range to start the vehicle, the driver operates the shift lever with the brake pedal depressed, and then operates the brake pedal. Will be separated. In that case, when the foot is released, the open / close valve is test-driven. At this time, since the vehicle is stopped, the noise around the driver is small, and the driver hears the valve driving sound and gives an uncomfortable feeling.

Further, there is a problem that the test drive of the open / close valve is not performed when a failure of the brake lamp switch occurs.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problem, and aims at improving safety by preventing sticking of an on-off valve and eliminating an uncomfortable feeling acting on a driver when checking a valve. An object of the present invention is to provide a valve check control device for a mechanism.

[0009]

According to a first aspect of the present invention, there is provided a valve check control device for an antilock brake mechanism for preventing the lock of each wheel during braking of a vehicle. A vehicle speed detecting means for detecting a running speed of the vehicle; a first vehicle speed determining means for determining whether a running speed of the vehicle detected by the vehicle speed detecting means is equal to or higher than a first set speed set in advance; a brake operation condition detecting means for detecting the operating state of the brake of the vehicle, the anti-lock shake
Anti-lock brake to detect whether the
Rake operating state detecting means, valve opening / closing operation command sending storage means for storing that an opening / closing operation command has been issued to an opening / closing valve for controlling a brake fluid pressure after an ignition switch of the vehicle is turned on, the first vehicle speed determining means and the brake Operating state detecting means and detecting the operating state of the antilock brake
In means and said valve opening and closing operation command sending storage means and the running speed of the vehicle based on the result output from the first set speed or more, the brake is in a non-actuated state, the anti-lock
Valve check operating means for issuing an open / close operation command of the open / close valve when the brake system is not operating and there is no storage in the valve open / close operation command transmission storage means.

Accordingly, the traveling speed of the vehicles is at first set speed or more, the brake is in the inoperative state, the anti-lock
When the brake system is inactive and there is no memory in the valve opening / closing operation command transmission storage means, the valve check operating means issues an opening / closing operation command of the opening / closing valve to check that the vehicle is at or above the first set speed. Since there are various noises around the driver, the operation is performed in a state where the brake is not operated, so that the discomfort acting on the driver at the time of the valve check can be eliminated. Also, anti-lock brake
When the vehicle is in a driving state that requires activation of the key system
Of vehicle behavior caused by performing a valve check on the vehicle
Can also be prevented.

According to a second aspect of the present invention, there is provided the valve check control device for the antilock brake mechanism, wherein the traveling speed of the vehicle detected by the vehicle speed detecting means is higher than the first set speed. a second vehicle speed determining means for determining whether a set speed or more, the valve check actuating means, the said second vehicle speed determination means a
When the traveling speed of the vehicle is equal to or higher than a second set speed based on the results output by the antilock brake operating state detecting means and the valve opening / closing operation command transmission storage means,
When the brake system is not operating and there is no memory in the valve opening / closing operation command sending storage means, the opening / closing valve opening / closing command is issued.

Accordingly, the second vehicle speed judging means judges whether or not the running speed of the vehicle is equal to or higher than a second set speed which is larger than the first set speed, and if the running speed of the vehicle is higher than the second set speed. That's all for the anti-lock brake system
When the system is not operating and there is no memory in the valve opening / closing operation command transmission storage means, the valve check operating means issues an opening / closing valve opening / closing operation command irrespective of the operation state of the brake, and the vehicle brake is operated. Even if the brake operation state detecting means for detecting the operation state is out of order in the operation state, the valve check is surely performed. Also,
You need to activate the anti-lock brake system
This is caused by performing a valve check when driving
Vehicle behavior can be prevented.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a flowchart of control in a valve check control device of an antilock brake mechanism according to an embodiment of the present invention, and FIG. 2 shows a control block of the valve check control device of the antilock brake mechanism.

In the anti-lock brake mechanism of the present embodiment, as shown in FIG. 2, reference numeral 11 denotes a brake pedal provided in the vehicle interior, and a brake switch 12 is mounted on the brake pedal 11. The brake pedal 11 is connected to a master cylinder 13 that operates in accordance with the depression of the brake pedal 11, and a reservoir tank 15 that supplies hydraulic pressure via pipes 14a and 14b is connected to the master cylinder 13. Have been. On the other hand, the wheel cylinder 16
A disk brake device 17 (only one is shown in FIG. 2) is mounted. The disk brake device 17 has a pair of opening / closing valves (solenoid valves) 19 for controlling brake fluid pressure via a pipe 18. 20 are connected. The first opening / closing valve 19 normally opens the port 21 when the piston 19b is urged in one direction by the spring 19a. The second opening / closing valve 20 normally closes the port 22 when the piston 20b is urged in the other direction by the spring 20a.

The port 21 of the first opening / closing valve 19
Is connected to the master cylinder 13 via a pipe 23,
The reservoir tank 1 is connected to the port 22 of the second opening / closing valve 20.
5 is connected via a pipe 24. Further, a pipe 25 is provided between the reservoir tank 15 and a pipe 23 connected to the port 21 of the first opening / closing valve 19, and a supply pump 27 operated by a pump motor 26 is interposed in the pipe 25. I have.

The brake switch 12, a wheel speed sensor 30, and an ignition switch 31 are connected to an ABS (anti-lock brake mechanism) controller 28. The brake operation state, the wheel speed, and the ignition operation state are controlled. Is to be entered. Further, the ABS controller 28 includes a pump motor 2
6 and a pair of on-off valves 19 and 20 are connected.
The BS controller 28 can drive and control the opening / closing valves 19 and 20 and the pump motor 26 based on various detection results.

Therefore, at the time of normal braking in which the ABS does not operate, the ABS controller 28 controls the on-off valves 19,
20 is not energized, the first on-off valve 19 is connected to port 2
1 is opened, and the second opening / closing valve 20 closes the port 22. When the driver depresses the brake pedal 11 in this state, the brake operation force (pedal force) output from the brake pedal 11 is converted into brake fluid pressure by the master cylinder 13, and the brake fluid pressure is released through the first pipe 23 through the pipe 23. The fluid is supplied to the wheel cylinder 16 of the disc brake device 17 on the wheel side through the pipe 18 through the port 21 of the opening / closing valve 19. Then, the wheel cylinder 16
As a result, a brake caliper (not shown) operates to apply a braking force to the wheels. When the driver releases the brake pedal 11, the brake fluid pressure in the master cylinder 13 decreases, so that the fluid pressure in the wheel cylinder 16 also decreases, and the brake is released.

On the other hand, when the driver performs a sudden braking operation and the wheels are likely to be locked, the wheel speed sensor 30 detects this and outputs it to the ABS controller 28, and the ABS controller 28 energizes the opening / closing valves 19, 20. And the first
The on / off valve 19 closes the port 21, and the second on / off valve 20 opens the port 22. Then, the brake fluid pressure of the wheel cylinder 16 flows through the pipe 18 and decreases, and the pressure is reduced and the brake is released. And piping 18
The brake fluid pressure flowing to the second open / close valve 2
The fluid is returned to the reservoir tank 15 through the pipe 24 through the port 22 of the zero. At this time, the ABS controller 28
Outputs a drive signal to the pump motor 26 to operate the supply pump, and the brake fluid pressure in the reservoir tank 15
And pressurized.

Thereafter, when it is determined that the wheels do not have a tendency to lock, the ABS controller 28 controls each of the open / close valves 19,2.
0, the first opening / closing valve 19 is switched to the port 21.
And the second opening / closing valve 20 closes the port 22. Then, the brake fluid pressure of the master cylinder 13 is released through the pipe 23 through the port 21 of the first opening / closing valve 19.
Is supplied again to the wheel cylinder 16 of the disc brake device 17 on the wheel side through the pipe 18 and the pressure is increased. Then, the brake caliper is operated by the wheel cylinder 16, and a braking force is applied to the wheels.

In the above description, the operation of the ABS is described for only one wheel, but the same control is performed for all four wheels.

In the antilock brake mechanism configured as described above, in the present embodiment, a valve check control device is provided for preventing a malfunction due to sticking of the pair of open / close valves 19 and 20 in the ABS. This valve check control device (valve check operating means)
Is to issue an operation command for the on-off valves 19 and 20 irrespective of the ABS operation control when a predetermined condition is satisfied.

As conditions for operating the valve check control device, there are four condition items, as shown in FIG. 1, a vehicle speed V is set to a first set speed V ₁ (for example, 5 km).
/ h) or more, the brake switch (brake operation state detection means) is in the non-operation state (OFF),
The ABS is not controlled, and the valve check execution flag (valve opening / closing operation command transmission storage means) is OFF. The valve check is performed when these four conditions are met. That is, the condition is that the ABS controller 28 calculates the vehicle speed V based on the wheel speed sensor 30,
Performed by comparing the vehicle speed V and the first set speed V ₁ (first
Vehicle speed determining means). Is the ABS controller 28
Is determined based on the output signal of the brake switch 12. Is determined whether or not the ABS controller 28 controls the operation of the ABS. The condition (1) is to control the operation of the ABS after turning on the ignition switch of the vehicle, and to determine whether or not the valve check execution flag is set.

[0025] Thus, in the condition that the vehicle speed V is first set speed V ₁ or more, it was confirmed that the vehicle is traveling. The condition is that the brake switch 12 is in the non-operation state (OFF), and the brake pedal 1
1 can be prevented from being transmitted to the driver. When the driver depresses the brake pedal during the valve check, the valve check process is continued. The conditions are such that the control of the ABS is not adversely affected. If the ABS control is started during the valve check, the valve check process is interrupted and the ABS control is prioritized. Under the conditions, the valve is checked only once in one run, and unnecessary opening / closing valves 19 and 2 are used.
0 opening / closing operation is suppressed. In addition, the one-time opening / closing valve 19,
When the opening / closing operation of the valve 20 is performed, the valve check execution flag is raised and turned on, but the ignition switch 31 is turned off.
When it becomes F, the valve check execution flag is cleared.

In the valve check control device of the antilock brake mechanism, three conditions are set in addition to the above four conditions. Even if the above four conditions are not satisfied, the three conditions are set. Is established, the open / close valves 19 and 20 are operated irrespective of the operation state of the brake.

As conditions for operating the valve check control device, there are three condition items: a vehicle speed V is equal to or higher than a second set speed V ₂ (for example, 40 km / h) which is larger than a preset first set speed V _1. That the ABS is not being controlled, and that the valve check execution flag (valve opening / closing operation command transmission storage means) is OFF;
When these three conditions are met, a valve check is performed. That is, the condition, and calculates the vehicle speed V ABS controller 28 based on the wheel speed sensor 30 is performed by comparing the vehicle speed V and the second set speed V ₂ (second vehicle speed determining means).
Are determined whether the ABS controller 28 is operating. The condition (1) is to control the operation of the ABS after turning on the ignition switch of the vehicle, and to determine whether or not the valve check execution flag is set.
Thus, in the condition that the vehicle speed V is a second set speed V ₂ or more, it was confirmed that the vehicle is traveling middle speed. The conditions and conditions are the same as those described above, and a description thereof will not be repeated.

That is, when the brake switch 12 attached to the brake pedal 11 is turned on and fails,
Since none of the four conditions described above (the brake switch is in the inoperative state) does not apply, the condition is not satisfied and the valve check is not performed. Therefore, when the vehicle speed V is not performed the valve checked even when the second set speed V ₂ or more set in advance, there is a possibility that the brake switch 12 fails in the ON state, the above-mentioned three things ()
Is established, the open / close valves 19 and 20 are operated to perform a valve check.

As described above, vehicle speed V ≧ first set speed V ₁ , brake switch OFF, ABS non-control,
When the four conditions of the valve check execution flag OFF are satisfied, or when the vehicle speed V ≧ the second set speed V ₂ , A
During BS non-control, a valve check is performed when any of the three conditions of the valve check execution flag OFF is satisfied. That is, when the vehicle starts for the first time, the brake switch is turned off.
If the ABS is not controlled and the valve check has not been performed yet, the valve check is performed, and if the vehicle speed has become middle and low, if the valve check has not been performed yet, the brake switch is turned on. Regardless of / OFF, a valve check is performed if the ABS is not controlled.

[0030]

Effect of the Invention] According to the valve check control unit of the anti-lock brake mechanism of the invention of claim 1, valves check the vehicle has a variety of noise around the driver that the first set speed or more, the brake Since the operation is not performed in the operating state, it is possible to eliminate the discomfort affecting the driver during the valve check. Also, anti-lock brake system
When the vehicle is in a driving state where it is necessary to
Prevents vehicle behavior disturbance caused by bus check
You can also.

Further, according to the valve check control device of the antilock brake mechanism of the second aspect of the present invention , even if the brake operation state detecting means for detecting the operation state of the brake of the vehicle is broken in the operation state, it is ensured that The valve check can be performed quickly, and safety can be improved. Also activate the antilock brake system
Perform a valve check when driving is necessary
Can also prevent disturbances in vehicle behavior
You.

[Brief description of the drawings]

FIG. 1 is a flowchart of control in a valve check control device of an antilock brake mechanism according to an embodiment of the present invention.

FIG. 2 is a control block diagram of a valve check control device of the antilock brake mechanism.

[Explanation of symbols]

Reference Signs List 11 brake pedal 12 brake switch (brake operation state detecting means) 13 master cylinder 15 reservoir tank 16 wheel cylinder 17 disk brake device 19, 20 opening / closing valve 28 ABS controller (first vehicle speed determining means, second vehicle speed determining means, valve opening / closing operation) Command transmission storage means, valve check operation means) 30 wheel speed sensor (vehicle speed detection means) 31 ignition switch

Claims (2)

(57) [Claims] In an anti-lock brake mechanism for preventing locking of each wheel during braking of a vehicle, a vehicle speed detecting means for detecting a running speed of the vehicle, and a running speed of the vehicle detected by the vehicle speed detecting means is determined in advance. First set
A first vehicle speed judging means for judging whether a set speed or more, the brake operation state detecting means for detecting an operating state of the brake of the vehicle, the anti-lock brake cis
Anti-lock brake that detects whether the system is operating
Moving state detection means, valve opening / closing operation command transmission storage means for storing that an opening / closing operation command has been issued to an opening / closing valve for controlling a brake fluid pressure after an ignition switch of the vehicle is turned on, the first vehicle speed determining means, and the brake operation The travel speed of the vehicle is equal to or higher than a first set speed based on the results output from the state detection means, the antilock brake operation state detection means, and the valve opening / closing operation command transmission storage means, and the brake is activated. In the non-operating state, the anti-lock brake
Valve check operating means for issuing an open / close operation command of the open / close valve when the system is inactive and there is no storage in the valve open / close operation command sending storage means. Control device. 2. The valve check control device for an anti-lock brake mechanism according to claim 1, wherein the traveling speed of the vehicle detected by the vehicle speed detecting means is higher than the preset first preset speed. a second vehicle speed determining means for determining whether a rate or more, the valve check actuating means, the said second vehicle speed determination means a
When the traveling speed of the vehicle is equal to or higher than a second set speed based on the results output by the antilock brake operating state detecting means and the valve opening / closing operation command transmission storage means,
A valve check control device for an anti-lock brake mechanism, wherein a command to open and close the open / close valve is issued when the brake system is not operating and there is no storage in the valve open / close operation command transmission storage means.