JP3100731B2 - Control device for in-vehicle electrical components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control apparatus for on-vehicle electrical components 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 In general, a vehicle is provided with various sensors, and controls on-vehicle electric components such as an engine control system, a steering system, and a brake system based on signals supplied from the sensors.

Conventionally, in this type of control device for on-vehicle electric components, necessary sensors are provided for each control unit, and each control unit controls the control based on detection signals supplied from these sensors. . For example, a control unit of a four-wheel steering system (4WS) that can control 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 the wheels and the road surface during braking and running of the vehicle The control unit of a so-called anti-lock brake and traction (ABS / TRC) system controls the slip between the vehicle and the vehicle by controlling the brake oil pressure. The rotation detection signal of the wheel, which is output according to the rotation of the vehicle, is supplied.

[0004]

Incidentally, in each control unit such as the four-wheel steering system or the anti-lock brake and traction system as described above, for example, a wheel speed signal of the vehicle is commonly used as a control parameter. However, as described above, if sensors required for each control unit are provided, the number of sensors used increases, and a communication line for transmitting a detection signal from the sensor to each control unit is required. In addition to the complexity of the harness used, there is a problem that a space for mounting each sensor and a special structure for mounting are required, and the cost of a control device for on-vehicle electrical components increases.

In order to solve such a problem, a common communication line is connected through communication means for inputting / outputting a signal.
It has been proposed to simplify the harness by configuring a data link together with other control devices so as to perform communication between the control devices using a common communication line (see FIG. 1). For example, JP-A-63-
See 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 control based on this error is performed in another control unit. There was a problem that it would.

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 vehicle information detecting means for detecting information accompanying use of a vehicle.
It is an object of the present invention to provide a control device for in-vehicle electrical components in which, when an error in information is detected, a control unit is shifted to a fail-safe mode to ensure vehicle safety.

An object of the present invention according to claim 2 of the present application is to provide a system for detecting rotation of a wheel of a vehicle and using a wheel rotation signal as a common signal when an error of a detected wheel speed information signal is detected. An object of the present invention is to provide a control device for on-vehicle electrical components in which a control unit is shifted to a control mode of a fail-safe mode to ensure vehicle safety.

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

An object of the invention according to claim 4 of the present application is to detect the occurrence of an error in the vehicle speed information signal and shift the control of ABS traction and 4WS to a fail-safe mode to ensure vehicle safety. .

[0011]

Therefore, the invention according to claim 1 of the present application provides a vehicle information detecting means for detecting information accompanying use of a vehicle, and a vehicle information detecting means for detecting vehicle information detected by the vehicle information detecting means. A first control unit for controlling the first operation of the vehicle based on a vehicle information signal output from the vehicle information processing means, comprising a vehicle information processing means for performing arithmetic processing; A second control unit for controlling a second operation of the vehicle based on the vehicle information signal; and detecting a failure of the vehicle information processing means of the first control unit and outputting a fail-safe mode transition signal. Fail determining means for shifting the second control unit to the fail-safe mode control mode.

[0012]

According to a second aspect of the present invention, there is provided a control apparatus for an on-vehicle electrical component according to the first aspect, wherein the vehicle information detecting means detects rotation of wheels of the vehicle. A wheel rotation signal is output, and the vehicle information processing means of the first control unit calculates the wheel rotation signal to detect a wheel speed information signal, and detects a stopped state of the vehicle. Stop state detection means, wherein the fail determination means determines a failure of the wheel speed information processing means based on the output signal of the stop state detection means and the wheel speed information signal and outputs a fail-safe mode transition signal. Features.

Further, the invention according to claim 3 of the present application detects the DC signal component transmitted by the signal transmission line from the first control unit to the second control unit to detect the first signal.
A power down judgment circuit for judging a power down of the control unit, wherein the fail judgment 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. (4
(WS) system control unit.

[0015]

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

According to the invention of claim 2 of the present application, the control unit uses the wheel rotation signal detected from the rotation of the wheels of the vehicle as a common signal and detects an error in the detected wheel speed information signal. Is shifted to the control mode of the fail-safe mode, so that safety in running of the vehicle can be ensured 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. Safety can be ensured.

According to the present invention, when an error in the vehicle speed information signal is detected, the control units of the antilock brake and traction (ABS / TRC) system and the four-wheel steering (4WS) system fail. Since the mode shifts to the safe mode, safety in running the vehicle can be ensured 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. The control device for in-vehicle electrical components according to the present invention,
A control unit of a four-wheel steering system (hereinafter referred to as a 4WS system) that can control not only the front wheels but also the turning direction and the steering angle of the rear wheels according to the vehicle speed or the steering angle of the steering wheel, or when braking and running the vehicle The configuration of an embodiment applied to a control unit of a so-called antilock brake and traction system (hereinafter, referred to as an ABS / TRC system) that controls a slip between wheels of a vehicle and a road surface by controlling a brake hydraulic pressure. As shown in FIG.

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

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

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 emitters are grounded.
Are also supplied to the control unit 3 of the 4WS system as common wheel speed information signals through communication lines 5 and 6 connected to the collectors of the 4WS system.

Information signals other than the wheel speed information signals 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. The communication lines 7, 8
And 9 each have one end at A, as shown in FIG.
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 connected to the collectors of np type output transistors Q3, Q4 and Q5, a pull-down resistor R1 is connected between the other ends of the communication lines 7, 8 and 9 and ground in the control unit 3 of the 4WS system. , R2 and R3
Are respectively connected.

The control unit 3 of the 4WS system includes:
As shown in FIG. 1, AB through the communication lines 5 and 6
A stop state detection device 11 is provided for determining 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 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 detects the wheel speed information signal supplied from the wheel speed information detection circuit 4 of the control unit 2 of the ABS / TRC system based on the detection signal of the stop state detection device 11, A failure 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 failure determination device 12 is determined, for example, by the following [1] determination logic based on wheel speed detection, [2] determination logic based on running state signal down determination, and [3] ABS / TRC. The determination is made 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 even though a signal indicating that the vehicle is running is output from the stop state detection device 11. When not. This determination is made in the wheel speed abnormality determination section (A) of FIG. (B) When the traveling state signal indicates a sign other than stop even though the wheel speed information signal is 5 km / h or less. This determination is made in the wheel speed abnormality determination section (B) of FIG. [2] Judgment logic based on judgment of running state signal down Judgment is made by (b) of the judgment logic based on the wheel speed information signal. In this embodiment, in addition to the determination logic [1], [3] power down determination logic of the control unit 2 of the ABS / TRC system All signals input to the 4WS control unit 3 from the signal lines 7, 8, and 9 are input. When low level, ABS / T
It is determined that the power of the control unit 2 of the RC system is down.

When it is determined based on the above determination logic that there is an abnormality (failure), the failure determination device 12 outputs a failure 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 safety of the vehicle even when 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, 4 W
Since the control unit 3 of the S system shifts to the fail-safe mode, even when the power supply of the control unit 2 of the ABS / TRC system is down, safety in running the vehicle can be ensured.

In the above embodiment, the stop state detecting device 11 and the fail judging device 12 may be provided separately from the control unit 3 of the 4WS system, and the fail signal may be transmitted to the control unit 2 of the ABS / TRC system.
The control unit 3 of the ABS / TRC system may be shifted to the fail-safe mode together with the control unit 3 of the 4WS system.

In the above embodiment, the wheel speed is detected and the AB
Although the control unit 2 of the S / TRC system and the control unit 3 of the 4WS system are used as common control parameters, the present invention is not limited to this, and common control parameters are used between a plurality of control units of a vehicle. Using the parameters, the error can be determined, and the control unit can be shifted to the fail-safe mode to ensure the safety of the running of the vehicle.

[Brief description of the drawings]

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

FIG. 2 is an ABS diagram of the control device for in-vehicle electrical components in FIG. 1;
FIG. 5 is an explanatory diagram of a 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 obtained by shaping the pulse.

FIG. 4 is a time chart for explaining wheel speed determination by a failure 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 judgment device Q3 transistor Q4 transistor Q5 transistor R1 pull-down resistor R2 pull-down resistor R3 pull-down resistor

Continuation of the front page (56) References JP-A-57-130108 (JP, A) JP-A-3-283845 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60R 16 / 02 650 B60R 16/02 660

Claims (4)

(57) [Claims] 1. A vehicle information detecting means for detecting information accompanying use of a vehicle, a vehicle information processing means for calculating and processing detected vehicle information detected by the vehicle information detecting means, and output from the vehicle information processing means. A first control unit that controls a first operation of the vehicle based on a vehicle information signal to be transmitted, and controls a second operation of the vehicle based on the vehicle information signal that is supplied from the first control unit Second
And a failure determining means for detecting a failure of the vehicle information processing means of the first control unit, outputting a fail-safe mode transition signal, and transitioning the second control unit to a fail-safe mode control mode. A control device for in-vehicle electrical components, comprising: 2. The vehicle information detecting means detects a rotation of a wheel of a vehicle and outputs a wheel rotation signal. The vehicle information processing means of the first control unit performs arithmetic processing on the wheel rotation signal. And a stop state detecting means for detecting a stop state of the vehicle, wherein the fail determination means detects the wheel speed information signal based on an output signal of the stop state detection means and a wheel speed information signal. 2. The control apparatus according to claim 1, wherein the control unit outputs a fail-safe mode transition signal upon determining a failure of the wheel speed information processing unit. 3. A power down determining circuit for detecting a DC signal component transmitted by a signal transmission line from the first control unit to the second control unit to determine power down of the first control unit. 3. The on-vehicle electrical component control device according to claim 1, wherein a fail-safe mode transition signal is output from the fail determination unit when power is turned off. 4. The control unit of claim 1, wherein the first control unit is a control unit of an antilock brake and traction (ABS / TRC) system, and the second control unit is four control units.
The control device for a vehicle-mounted electric component according to any one of claims 1 to 3, wherein the control device is a control unit of a wheel steering (4WS) system.