JPH05221273A - Control device for on-vehicle electrical equipment - Google Patents

Abstract

PURPOSE:To ensure safety of a vehicle by transferring a control unit to a fail safe mode when an error of a wheel rotational signal of a vehicle, detected as a common signal, is detected. CONSTITUTION:A device comprises a wheel speed information detecting means 4 for detecting a wheel speed information signal by arithmetically processing a wheel rotational signal output from wheel rotation detecting means 1R, 1L of outputting the wheel rotational signal, first control unit 2 for controlling the first action of a vehicle based on the detected wheel speed information signal and the second control unit 3 supplied with the vehicle speed information signal from the first control unit 2 to control the second action of the vehicle based on the supplied wheel speed information. When a trouble in the wheel speed information detecting means 4 of the first control unit 2 is detected, at least one of the first/second control units 2, 3 is transferred to a control mode of fail safe mode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an on-vehicle electrical component in which a plurality of control units provided in a vehicle control the vehicle using a common vehicle information signal.

[0002]

2. Description of the Related Art Generally, a vehicle is provided with various sensors, and on-vehicle electric components such as an engine control system, a steering system and a brake system are controlled based on signals supplied from the respective sensors.

Conventionally, in this type of control device for an on-vehicle electric component, each control unit is provided with a required sensor, and each control unit controls the control based on a detection signal supplied from these sensors. .. For example, a control unit of a four-wheel steering system (4WS) capable of controlling not only the front wheels but also the steering direction and the steering angle of the rear wheels according to the vehicle speed or the steering angle of the steering wheel, or the wheels and the road surface during braking and traveling of the vehicle. In a control unit of a so-called anti-lock brake and traction (ABS / TRC) system that controls a slip between and by controlling a brake hydraulic pressure, a vehicle speed sensor provided for each control unit is used to drive a driven wheel of a vehicle. A wheel rotation detection signal that is output according to the rotation of the vehicle is supplied.

[0004]

By the way, in each control unit of the above-mentioned four-wheel steering system or anti-lock brake and traction system, for example, a vehicle wheel speed signal or the like is commonly used as a control parameter. However, as described above, when the required sensor is provided for each control unit, the number of sensors used increases and a communication line for transmitting a detection signal from the sensor to each control unit is required. There is a problem that not only the harness to be used becomes complicated, but also a space for mounting each sensor and a special structure for mounting are required, which increases the cost of the control device for the vehicle-mounted electric component.

In order to solve such a problem, a common communication line is connected through a communication means for inputting / outputting signals,
It has been proposed that a harness be simplified by configuring a data link with other control devices so that the control devices communicate with each other using a common communication line ( For example, Japanese Patent Laid-Open No. 63-
See Japanese Patent No. 148739. )

However, when communication is performed using a common communication line, an error generated in one control unit is transmitted to another control unit, and another control unit performs control based on this error. There was a problem that it would end up.

An object of the invention according to claim 1 of the present application is to provide a system in which a control unit uses a common signal from a vehicle information detecting means for detecting information associated with use of a vehicle,
It is an object of the present invention to provide a control device for an on-vehicle electrical component, which detects the error of information and shifts the control unit to a fail-safe mode to ensure the safety of the vehicle.

An object of the invention according to claim 2 of the present application is to detect a rotation of a vehicle wheel and use a wheel rotation signal as a common signal when an error in the detected wheel speed information signal is detected. It is an object of the present invention to provide a control device for an on-vehicle electrical component that ensures the safety of a vehicle by shifting a control unit to a fail-safe mode control mode.

It is an object of the invention according to claim 3 of the present application to provide a control device for an on-vehicle electrical component which detects a power down of a control unit and shifts to a fail-safe mode to ensure vehicle safety. Is.

An object of the invention according to claim 4 of the present application is to secure the safety of the vehicle by detecting the occurrence of an error in the vehicle speed information signal and shifting the control of the ABS traction and the 4WS to the fail-safe mode. ..

[0011]

Therefore, the claims of the present application
The invention according to 1 is a vehicle for detecting information associated with the use of the vehicle.
The information detecting means and the detected vehicle information are arithmetically processed to obtain the vehicle information.
It is equipped with vehicle information processing means that outputs a
Controls the first operation of the vehicle based on the vehicle information signal
The first control unit, and the first control unit
The vehicle information signal is supplied, and the vehicle information signal is supplied.
Control for controlling the second operation of the vehicle based on
Unit and vehicle information processing hand of the first control unit
Stage failure is detected and a fail safe mode transition signal is output.
The first control unit and the second control unit.
At least one of the
It is characterized by having a fail determination means for shifting to
It is what

The invention according to claim 2 of the present application calculates the wheel rotation detecting means for detecting the rotation of the wheel of the vehicle and outputting the wheel rotation signal, and the wheel rotation signal output from the wheel rotation detecting means. A first control unit for controlling the first operation of the vehicle on the basis of the detected wheel speed information signal, and a wheel speed information processing means for processing the detected wheel speed information signal; A wheel speed information signal from a unit, and a second control unit that controls a second operation of the vehicle based on the supplied wheel speed information signal, and a wheel speed of the first control unit. A control device for an on-vehicle electrical component, wherein at least one of the first control unit and the second control unit is shifted to a control mode of a fail-safe mode when a failure of the information detecting means is detected. Thus, the wheel speed information processing means based on the stop state detecting means for detecting the stop state of the vehicle, the output signal of the stop state detecting means, and the wheel speed information signal supplied from the first control unit. And a fail determination means for determining the failure and outputting a fail safe mode transition signal.

Further, in the invention according to claim 3 of the present application, the DC signal component transmitted by the signal transmission line from the first control unit to the second control unit is detected to detect the first signal.
The control unit is provided with a power down determination circuit for determining power down, and the fail determination means outputs a fail safe mode transition signal when the power is down.

Further, in the invention according to claim 4 of the present application, the first control unit is a control unit of an antilock brake and traction (ABS / TRC) system, and the second control unit is a four-wheel steering system. (4
It is a control unit of a WS) system.

[0015]

According to the invention of claim 1 of the present application, the control unit shifts to the fail-safe mode when detecting an error of the common signal from the vehicle information detecting means, so that the safety of the vehicle is ensured. be able to.

According to the invention of claim 2 of the present application, the wheel rotation signal detected from the rotation of the wheel of the vehicle is used as a common signal, and when the error of the detected wheel speed information signal is detected, the control unit is detected. Is switched to the control mode of the fail-safe mode, it is possible to ensure the safety in running the vehicle even if an error occurs in the wheel speed information signal.

According to the invention of claim 3 of the present application, when the power-down of the control unit is detected, the control unit shifts to the fail-safe mode. Therefore, even if the power-down of the control unit occurs, the vehicle travels. The safety of can be secured.

According to the invention of claim 4 of the present application, when an error in the vehicle speed information signal is detected, the control units of the anti-lock brake and traction (ABS / TRC) system and the four-wheel steering (4WS) system fail. Since the mode shifts to the safe mode, it is possible to ensure the safety in running the vehicle even if an error occurs in the wheel speed information.

[0019]

Embodiments of the present invention will be described below with reference to the accompanying drawings. A control device for in-vehicle electrical equipment according to the present invention,
A control unit of a four-wheel steering system (hereinafter referred to as a 4WS system) capable of controlling not only the front wheels but also the steering direction and steering angle of the rear wheels according to the vehicle speed or the steering angle of the steering wheel, or during braking and running of the vehicle. 1 shows a configuration of a control unit of a so-called anti-lock brake and traction system (hereinafter, referred to as ABS / TRC system) for controlling slip between a wheel of a vehicle and a road surface by controlling a brake hydraulic pressure. Shown in.

The on-vehicle electrical equipment control system shown in FIG. 1 detects the wheel speeds by means of the wheel speed sensors 1R and 1L as the wheel speed pulse signals of the number proportional to the rotation of the wheels of the vehicle (not shown). The wheel speed information signal obtained by counting the signals is used as the control unit 2 of the ABS / TRC system and the control unit 3 of the 4WS system.
The control information is commonly used.

The wheel speed sensors 1R and 1L are right wheel speed sensors 1R that generate left and right wheel speed pulse signals as shown in the upper part of FIG. 3 in a number proportional to the rotational speeds of the left and right driven wheels of the vehicle. And a left wheel speed sensor 1L. The left and right wheel speed pulse signals output from the right wheel speed sensor 1R and the left wheel speed sensor 1L are input to the wheel speed pulse processing circuit 4 provided in the control unit 2 of the ABS / TRC system. The wheel speed pulse processing circuit 4 waveform-shapes the input wheel speed pulse into a rectangular pulse as shown in the lower part of FIG. 3, counts this pulse, and calculates a count value per unit time. , And outputs wheel speed information signals of the left and right driven wheels, respectively.

The wheel speed information signals of the left and right driven wheels detected by the wheel speed pulse processing circuit 4 are ABS / TRC.
Npn type output transistors Q1 and Q2 which are supplied to the control unit 2 of the system and whose emitter is grounded
It is also supplied to the control unit 3 of the 4WS system as a common wheel speed information signal through the communication lines 5 and 6 connected to the collector of the.

Information signals other than the wheel speed information signal used in the control unit 2 of the ABS / TRC system are transmitted to the control unit 3 of the 4WS system through the communication lines 7, 8 and 9. Communication lines 7 and 8
2 and 9, each end has an A
P which is provided in the control unit 2 of the BS / TRC system and whose emitter is connected to the power supply (+ Vcc)
While being connected to the collectors of np type output transistors Q3, Q4 and Q5 respectively, a pull-down resistor R1 is connected between each of the other ends of the communication lines 7, 8 and 9 and the ground in the control unit 3 of the 4WS system. , R2 and R3
Are connected respectively.

The control unit 3 of the 4WS system is
As shown in FIG. 1, as shown in FIG.
A stop state detection device 11 is provided which determines whether the vehicle is running or stopped based on left and right wheel speed information input from the wheel speed pulse processing circuit 4 in the control unit 2 of the S / TRC system. When the vehicle speed of at least one channel of the left and right driven wheels of the vehicle is detected, the stop state detection device 11 determines that the vehicle is traveling and outputs a traveling signal. The control unit 3 of the 4WS system also, based on the detection signal of the stationary state detection device 11 and the wheel speed information signal supplied from the wheel speed information detection circuit 4 of the control unit 2 of the ABS / TRC system, A fail determination device 12 that determines a failure of the wheel speed information detection device 4 and outputs a fail safe mode transition signal.

The vehicle speed abnormality (failure) by the fail judgment device 12 is, for example, as follows: [1] judgment logic by wheel speed detection, [2] judgment logic by running state signal down judgment, and [3] ABS / TRC. It is determined by the power-down determination logic of the control unit 2 of the system. [1] Judgment logic based on wheel speed information signal (a) The wheel speed information signal exceeds 5 km / h although the stop state detection device 11 outputs a signal indicating that the vehicle is in a traveling state. When not. This determination is performed in the wheel speed abnormality determination section (A) of FIG. (B) When the running speed signal shows a code other than stop even though the wheel speed information signal is 5 km / h or less. This determination is performed in the wheel speed abnormality determination section (B) of FIG. [2] Judgment logic based on judgment of running state signal down Judgment based on (b) of judgment logic based on the wheel speed information signal. In the present embodiment, in addition to the above judgment logic [1], [3] power down judgment logic of the control unit 2 of the ABS / TRC system All signals inputted from the signal lines 7, 8 and 9 to the 4WS control unit 3 are all At low level, ABS / T above
It is determined that the power supply of the control unit 2 of the RC system is down.

When it is determined that there is an abnormality (failure) based on the determination logic, the fail determination device 12 outputs a fail signal to the control unit 3 of the 4WS system. As a result, the control unit 3 of the 4WS system shifts to the fail-safe control mode and can secure the traveling safety of the vehicle even if an error occurs in the wheel speed information signal. Also, when the power down of the control unit 2 of the ABS / TRC system is detected, 4W
Since the control unit 3 of the S system shifts to the fail-safe mode, even when the power of the control unit 2 of the ABS / TRC system goes down, safety in running the vehicle can be ensured.

In the above embodiment, the stop state detecting device 11 and the fail determining device 12 may be provided separately from the control unit 3 of the 4WS system, and a fail signal may be sent to the control unit 2 of the ABS / TRC system.
Alternatively, the control unit 3 of the 4WS system and the control unit 2 of the ABS / TRC system may be switched to the fail-safe mode.

In the above embodiment, the wheel speed is detected and AB is detected.
The control unit 2 of the S / TRC system and the control unit 3 of the 4WS system are used as common control parameters, but the present invention is not limited to this, and common control is performed between a plurality of control units of the vehicle. By using the parameter, it is possible to determine the error and shift the control unit to the fail-safe mode to secure the traveling safety of the vehicle.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of a control device for an on-vehicle electrical component according to the present invention.

FIG. 2 is an ABS in the control device for the on-vehicle electrical equipment of FIG.
FIG. 7 is an explanatory diagram of determination of power down of a control unit of the / TRC system.

FIG. 3 is an explanatory diagram of a wheel speed pulse output from a wheel speed sensor and a pulse whose waveform is shaped.

FIG. 4 is a time chart for explaining wheel speed determination of the fail detection logic.

[Explanation of symbols]

 1R Wheel speed sensor 1L Wheel speed sensor 2 ABS / TRC control unit 3 4WS control unit 4 Wheel speed pulse processing circuit 11 Stop state detection device 12 Fail determination device Q3 transistor Q4 transistor Q5 transistor R1 pull-down resistance R2 pull-down resistance R3 pull-down resistance

Claims (4)

[Claims] 1. A vehicle information detection means for detecting information associated with the use of a vehicle, and a vehicle information processing means for arithmetically processing the detected vehicle information and outputting a vehicle information signal, based on the detected vehicle information signal. A first control unit for controlling a first operation of the vehicle by the first control unit, the vehicle information signal is supplied from the first control unit, and a second operation of the vehicle is performed based on the supplied vehicle information signal. At least one of the first control unit and the second control unit that detects a failure of the second control unit that controls the vehicle information processing means of the first control unit and outputs a fail-safe mode transition signal. And a fail determination means for shifting the control mode to a fail-safe mode control mode. 2. A wheel rotation detecting means for detecting rotation of a wheel of a vehicle and outputting a wheel rotation signal, and a wheel rotation signal outputted from the wheel rotation detecting means for arithmetic processing to detect a wheel speed information signal. A first control unit that includes wheel speed information processing means and controls a first operation of the vehicle based on the detected wheel speed information signal, and the wheel speed information signal is supplied from the first control unit. A second control unit that controls the second operation of the vehicle based on the supplied wheel speed information signal, and detects a failure of the wheel speed information detecting means of the first control unit. A control device for an on-vehicle electrical component, wherein at least one of the first control unit and the second control unit is shifted to a fail-safe mode control mode, the stop device detecting a stopped state of the vehicle. A fail-safe mode transition signal is determined by determining a failure of the wheel speed information processing means based on the stop state detection means, the output signal of the stop state detection means, and the wheel speed information signal supplied from the first control unit. The control device for an on-vehicle electrical component according to claim 1, further comprising: a fail determination unit that outputs 3. A power down determination circuit for determining a power down of the first control unit by detecting a DC signal component transmitted by a signal transmission line from the first control unit to the second control unit. The control device for the on-vehicle electrical equipment according to claim 1 or 2, wherein the fail-safe mode transition signal is output from the fail determination means when the power is turned off. 4. The first control unit is an antilock brake and traction (ABS / TRC) system control unit, and the second control unit is four.
The control device for an on-vehicle electrical component according to any one of claims 1 to 3, which is a control unit of a wheel steering (4WS) system.