JPH07315199A - On-vehicle electronic control system - Google Patents

Abstract

PURPOSE:To make an electronic control system free to work as much as possible even in the case when there is a temporary contact failure because of attachment of dust, the end of life of a contact point, etc., is near, working is not certain, etc. CONSTITUTION:A TR1 intermittent control means 22 to control on and off a TR1 repeatedly for the specified number of times is provided. When a monitoring circuit 22a detects that voltage V1 of a load 30 does not become larger than a set value V0, after the TR1 intermittent control means 22c puts on and off the TR1 the specified number of times, it puts on the TR1. Consequently, as a temporary contact point failure is eliminated and a contact point 28a is closed, a microcomputer 22b makes an ABS/TRC system in a state free to work. In this way, it becomes possible to actuate the ABS/TRC system even when there is a temporary contact point failure of the contact point 28a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-skid brake control (hereinafter also referred to as ABS) system for preventing wheel lock during braking, and a traction control (hereinafter also referred to as TRC) for preventing idling of drive wheels when the vehicle starts. , Etc., especially for electronic control systems installed in vehicles, in particular safety relays for shutting off power to each component of the system when the electronic control system malfunctions to prevent those components from malfunctioning. The present invention relates to an in-vehicle electronic control system equipped with.

[0002]

2. Description of the Related Art An automobile is equipped with various electronic control systems such as an ABS control system and a TRC control system, and the electronic control unit controls the operation of each component of the electronic control system to control the vehicle. The operation control is optimized.

As such an on-vehicle electronic control system, conventionally, for example, an ABS system and a T system as shown in FIG.
ABS / TRC integrated with RC system
There is a system.

As shown in FIG. 4, this ABS / TRC system adjusts brake pressures of wheel speed sensors 3 and 4 and front wheels 1 and 2 for detecting wheel speeds of left and right front wheels 1 and 2 which are non-driving wheels. A modulator 5, a brake actuator 6 that generates a braking force on the front wheels 1 and 2, wheel speed sensors 9 and 10 that detect the wheel speeds of the left and right rear wheels 7 and 8 that are driving wheels,
Modulators 11 and 12 that adjust the brake pressures of the rear wheels 7 and 8, brake actuators 13 and 14 that generate braking force to the rear wheels 7 and 8, and a brake pedal 1, respectively.
Dual brake valve 1 controlled by 5
6. Open the air tank 1 during traction control
Compressed air in 7 is applied to modulator 1 of left and right rear wheels 7, 8.
Traction solenoid valve (hereinafter also referred to as TRC valve) 18,1 which is composed of solenoid valves for feeding to 1, 12 respectively
9. Motor 21, which is a governor actuator that operates a governor link that changes and sets the lower limit of the rotation speed of engine 20, modulators 5, 11, 12 and TRC valves 1
8, 19, A which is an electronic control device for controlling the motor 21
BS / TRC control unit (hereinafter ABS / T
(Also referred to as RC ECU) 22.

In the figure, 23 is an accelerator pedal, 2
4 and 25 are double check valves, 26 is ABS / TR
An alarm lamp that lights up to warn when an abnormality occurs in each component of the electric control system of the C system, 27 is a battery power source, 2
8 is a safety relay. In this ABS / TRC system, when the ABS / TRC system is abnormal, the safety relay 28 causes the modulators 5, 11, 12, T
The power to the components such as the RC valves 18 and 19 and the motor 21 is shut off to prevent the components from malfunctioning.

In the ABS / TRC system thus constructed, the wheel speed signals from the wheel speed sensors 3, 4, 9 and 10 are sent to the ABS / TRC ECU 22. During braking, the ABS / TRC ECU 22 calculates based on these wheel speed signals, and if it is determined that the wheels tend to lock based on the calculation results, the ABS / TRC
The RC ECU 22 outputs a control signal to the modulators 5, 11, 12 corresponding to the wheels that tend to lock. As a result, the modulators 5, 11, 12 adjust the brake pressures of the brake actuators 6, 13, 14 so as to eliminate the lock tendency of the wheels. Thus, A
The BS / TRC ECU 22 performs anti-skid brake control so that the wheel lock tendency is eliminated when the wheel lock tendency tends to occur during braking.

Further, when the propulsive force of the vehicle is increasing at the time of starting the vehicle or during sudden acceleration, the ABS / TRC ECU 22 calculates based on the wheel speed signals from the wheel speed sensors 3, 4, 9 and 10, and If it is determined from the calculation result that the rear wheels 7 and 8 that are the drive wheels tend to idle, this ABS / TRC ECU
The motor 22 outputs a control signal to the modulators 11 and 12 and the TRC valves 18 and 19 corresponding to the rear wheels 7 and 8 that tend to idle, and the motor 2 that operates the governor link.
The control signal is output to 1.

A control signal from the ABS / TRC ECU 22 turns on and opens the TRC valves 18 and 19, and compressed air from the air tank 17 is transferred to the TRC valves 18 and 19.
Double check valves 24 and 25 and modulator 1
It is supplied to the brake actuators 13 and 14 through 1 and 12, and the rear wheels 7 and 8 that tend to idle are braked. By the braking of the rear wheels 7 and 8, the rotational driving force of the rear wheels 7 and 8 is suppressed so that the idling tendency of the rear wheels 7 and 8 which tends to idle is eliminated. In this way, the ABS / TRC ECU22
The traction control is performed so that the idling tendency of the drive wheels is eliminated when the driving wheels tend to idling.

By the way, when performing ABS or TRC, it is necessary to accurately perform these ABS or TRC. For that purpose, each component operates reliably when necessary and the brake pressure or the rotational driving force of the drive wheels is increased. Is required to be controlled accurately. Therefore, conventionally, each component is diagnosed to surely detect the failure.

For example, as a failure detection device for the safety relay 28, there is a device shown in FIG. In FIG.
TR ₁ is a transistor for controlling ON / OFF of the safety relay 28, TR ₂ is a transistor for controlling ON / OFF of a load 30 which will be described later, TR ₃ is a transistor for controlling lighting of the alarm lamp 26, and 22a is an ABS / TRC ECU.
A monitoring circuit provided in 22 for monitoring the voltage V _{1 of the} load 30, 22b is a microcomputer for controlling TR ₁ , TR ₂ , TR ₃ and the monitoring circuit 22a, 28a is a contact of the safety relay 28, 28b is A solenoid coil of the safety relay 28, 29 is an ignition switch, and 30 is a load of a modulator solenoid of the modulator 5. Although not shown, the loads of the modulator solenoids of the modulators 11 and 12 are provided in parallel with the load 30 in addition to the load 30.

In the failure detection device for the safety relay 28, when the ABS / TRC system is started, as shown in FIG. 6, the ignition switch 29 is first activated.
When turned on, the microcomputer 22b of the ABS / TRC ECU 22 turns on TR ₁ . This allows
The solenoid coil 28b of the safety relay 28 is excited to close the contact 28a. After that, the voltage V of the load 30
_{When the} monitoring circuit 22a monitors ₁ and the voltage V ₁ is larger than the set value V ₀ shown by the chain double-dashed line in FIG. 6, the microcomputer 22b activates the ABS / TRC system. This brings the ABS / TRC system into an operable state.

When the voltage V ₁ is smaller than the set value V _{0 as} shown by the dotted line in FIG.
The S / TRC system is not activated, and TR ₃ is turned on to turn on the alarm lamp 26. As a result, ABS /
The TRC system is deactivated, and the driver can know that the ABS / TRC system is deactivated by turning on the alarm lamp 26.

[0013]

However, in the device for detecting failure of the safety relay 28 in the above-mentioned conventional ABS / TRC system, as is apparent from FIG. 6, the microcomputer 22b does not operate when the ABS / TRC system is activated. _I was just turning on TR ₁ . Therefore, when the life of the adhesion and contact the like of dust at the contacts 28a of the safety relay 28 had a temporary contact failure by close operation is not reliable or the like, the voltage of the load 30 be simply turned on TR ₁ V ₁ will not become larger than the set value V ₀ . As a result, even if the contact point 28a has a temporary contact failure, the microcomputer 22b does not operate at the ABS /
There is a problem that the ABS / TRC system is in a deactivated state without starting the TRC system.

The present invention has been made in view of the above problems, and an object thereof is to provide a temporary contact failure due to dust adhesion, a short life of contacts, etc., and uncertain operation. Another object is to provide an in-vehicle electronic control system that can be operated as much as possible.

[0015]

In order to solve the above-mentioned problems, the invention of claim 1 comprises a predetermined number of components,
A power supply connected to these components, a safety relay for connecting and disconnecting each of the components and the power supply, a switch means for turning on and off the safety relay, each of the components, the safety relay, and While controlling the switch means,
In an in-vehicle electronic control system, comprising: an electronic control device having a monitoring means for monitoring the voltage of each component when the switch means is turned on, the electronic control device further comprises: It is characterized in that it is provided with a switch connecting / disconnecting control means for turning on / off the switching means a predetermined number of times when it is detected to be small and then turning it on.

According to a second aspect of the present invention, the switch connection control means repeatedly turns on the switch means a predetermined number of times.
After the off control, it is characterized in that it is provided with an alarm means which is activated even when it is detected that the voltage is higher than a set value.

[0017]

In the vehicle-mounted electronic control system of the present invention thus constructed, the safety relay has a temporary contact failure due to dust adhesion at the contact point, contact life of the contact point and the like being uncertain. In this case, the switch connection / disconnection control means repeatedly turns on / off the contacts of the safety relay a predetermined number of times. This eliminates the temporary contact failure in the safety relay and enables the electronic control system to operate, preventing the electronic control system from stopping due to the temporary contact failure in the safety relay, and preventing the electronic control system from operating. The life will be extended.

Also, the activation of the alarm means informs the driver that the electronic control system is about to reach the end of its life.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a diagram showing an embodiment of an in-vehicle electronic control system according to the present invention, FIG. 2 is a diagram showing control timing in this embodiment, and FIG. 3 is a diagram showing a flow of control processing in this embodiment. The ABS to which this embodiment is applied
Since the / TRC system is the same as the conventional ABS / TRC system described above, the same components are denoted by the same reference numerals and detailed description thereof will be omitted.

As shown in FIG. 1, in this embodiment, a microcomputer 22b is provided with a TR ₁ on / off control means 22c for repeating ON / OFF control by repeating TR ₁ a predetermined number of times. Then, as shown in FIG. 2, when TR ₁ is turned on, when the monitoring circuit 22a detects that the voltage V _{1 of the} load 30 does not exceed the set value V ₀ , the TR ₁ intermittent control means 22c in the microcomputer 22b operates. T
After turning on / off R ₁ a predetermined number of times (3 times in the example shown in FIG. 2), TR ₁ is turned on. This allows
When the voltage V ₁ of the load 30 does not rise due to a temporary contact failure due to dust adhesion at the contact 28a of the safety relay 28, the life of the contact, etc. is near, and operation is not reliable, TR ₁ is turned on / off. By repeating the above, there is a case where the temporary contact failure is eliminated and the contact 28a is closed.

When the contact 28a is closed in this way, the voltage V
₁ rises and becomes larger than the set value V ₀ . When the monitoring circuit 22a detects this, the microcomputer 2
2b enables the ABS / TRC system.
As described above, according to this embodiment, the ABS / TRC system can be operated even if there is a temporary contact failure of the contact 22a, and the life of the ABS / TRC system can be extended. Become.

[0022] Incidentally, even after repeated on-off TR _1, no rise voltage V _1, when detecting the monitoring circuit 22a is smaller than the set value V _0, the contact failure is temporary If not, the microcomputer 2
2b is the ABS / T as in the conventional case as shown by the dotted line in FIG.
Deactivate the RC system. Further, when turning on the TR _1, when the monitoring circuit 22a that the voltage V ₁ of the load 30 is greater than the set value V ₀ is detected as safety relay 28 is normal, the microcomputer 22b is a conventional Similarly, enable the ABS / TRC system.

Next, the flow of each process in the control of this embodiment will be described. As shown in FIG. 3, first, in step S1, the ignition switch 29 is turned on, and then in step S2, the microcomputer 22b is turned on.
Turns on TR ₁ . Next, in step S3, the monitoring circuit 22a determines whether or not the voltage V ₁ is larger than the set value V ₀ . When it is determined that the voltage V ₁ is higher than the set value V ₀ , the microcomputer 22b activates the ABS / TRC system in step S4.

If it is determined in step S3 that the voltage V ₁ is not higher than the set value V ₀ , in step S5 the TR ₁ intermittent control means 22c repeatedly turns on and off TR _{1 a} predetermined number of times, and then step S6. At T
R ₁ is turned on. Next, in step S7, the monitoring circuit 22a again determines whether or not the voltage V ₁ is larger than the set value V ₀ . If it is determined that the voltage V ₁ is not higher than the set value V ₀ , it is determined that the safety relay 28 is abnormal, and the microcomputer 22b is determined in step S8.
Along with the ABS / TRC system operation stop state, the microcomputer 22b in step 9 turns on the TR _3. As a result, the alarm lamp 26 is turned on in step 10, the abnormality of the safety relay 28 is recorded in step S11, and then the process returns to the start.

When it is determined in step S7 that the voltage V ₁ is higher than the set value V ₀ , the microcomputer 22b activates the ABS / TRC system in step S12. Then, the process proceeds to step S9, and the same process as described above is performed thereafter. In addition,
As shown in FIG. 3, after the ABS / TRC system is set in the operable state in step S12, the process of step S11 may be directly performed without turning on the alarm lamp 26.

As described above, in the present embodiment, even if there is a temporary contact failure in the safety relay due to adhesion of dust on the contact or the uncertain operation of the contact or the like, the ABS / The TRC system can be activated and the life of the ABS / TRC system can be extended. Further, by turning on the alarm lamp 26, it becomes possible to inform the driver that the ABS / TRC system is about to reach the end of its life.

In the above-described embodiment, the case where the ABS system and the TRC system are incorporated together has been described, but the present invention is provided independently.
It can also be applied to BS and TRC systems. Also,
The present invention can be applied to other electronic control systems installed in vehicles other than the ABS system and the TRC system as long as the system includes the safety relay 28.

[0028]

As is apparent from the above description, according to the on-vehicle electronic control system of the present invention, the safety relay can be used due to the fact that dust is attached to the contacts and the life of the contacts and the like are short and the operation is not reliable. The electronic control system can be activated even if there is a temporary contact failure. This makes it possible to prevent the electronic control system from stopping due to a temporary contact failure of the safety relay, and to extend the life of the electronic control system.

Further, by activating the alarm means, it becomes possible to inform the driver that the electronic control system is about to expire.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of an in-vehicle electronic control system according to the present invention.

FIG. 2 is a diagram showing a control timing in this embodiment.

FIG. 3 is a diagram showing a flow of control processing of this embodiment.

FIG. 4 is a diagram showing an example of a conventional ABS / TRC system.

FIG. 5 is a diagram showing a conventional safety relay failure detection device.

FIG. 6 is a diagram showing a start timing of a conventional ABS / TRC system.

[Explanation of symbols]

1, 2 ... Left and right front wheels (non-driving wheels), 3, 4.9, 10 ... Wheel speed sensor, 5, 11, 12 ... Modulator for anti-skid control, 6, 13, 14 ... Brake actuator,
7, 8 ... Left and right rear wheels (driving wheels), 15 ... Brake pedal, 16 ... Dual brake valve, 17 ... Air tank, 18, 19 ... Traction electromagnetic valve (TRC valve), 20 ... Engine, 21 ... Motor, 22 ... ABS /
TRC control unit (Central processing unit: ABS /
TRC ECU), 22a ... Monitoring circuit, 22b ... Microcomputer, 22c ... TR ₁ intermittent control means, 23 ...
Accelerator pedal, 24,25 ... double check valve,
26 ... Alarm lamp, 27 ... Battery power supply, 28 ... Safety relay, 28a ... Safety relay 28 contacts, 2
8b ... Solenoid coil 28 of safety relay 28
b, 29 ... Ignition switch, 30 ... Load (modulator)

Claims (2)

[Claims] 1. A predetermined number of components, a power source connected to these components, a safety relay for connecting / disconnecting each component to / from the power source, and a switch means for turning on / off the safety relay. And an electronic control device that controls each of the components, the safety relay, and switch means, and an electronic control device that has a monitoring means that monitors the voltage of each component when the switch means is turned on. The electronic control device further includes switch connection / disconnection control means for turning on / off the switching means a predetermined number of times and then turning on when the monitoring means detects that the voltage is smaller than a set value. In-vehicle electronic control system characterized by: 2. An alarm means is provided, which is activated even when it is detected that the voltage is higher than a set value after the on / off control of the switch means by the switch connection / disconnection control means is repeated a predetermined number of times. The vehicle-mounted electronic control system according to claim 1.