JP2709930B2 - Failure indication method for in-vehicle electronic device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for displaying a failure of an in-vehicle electronic device. 2. Description of the Related Art In a hydraulic brake system of an automobile, when a brake pedal is depressed and a hydraulic pressure is supplied from a master cylinder to a brake system of each wheel, a reduction rate and a reduction amount of a wheel speed with respect to a vehicle body speed are detected. The pressure reduction and pressurization of the brake fluid supplied to the vehicle are alternately controlled by the operation of various solenoid valves and actuators such as electric motors to prevent the wheels from locking and to perform effective braking. Conventionally, various skid devices have been developed and disclosed in, for example, Japanese Patent Application Laid-Open No. Sho 60-128053. In the above-described anti-skid device, for example, a wheel speed sensor that detects a wheel speed and inputs a wheel speed signal to a control unit, or an abnormality such as a short circuit or a disconnection in various circuits connected to the control unit. When the occurrence occurs, the control unit has a self-diagnosis function capable of detecting the failure.When the self-determination is made that an abnormality has occurred, the fail-safe relay and the motor relay are turned off to stop the anti-skid control, and the anti-skid device is provided. It is necessary to provide a fail-safe device which ensures that there is no general braking system, i.e. a system in which the brake fluid pressure is supplied directly from the master cylinder to the wheel brake device. Problems to be Solved by the Invention As a method of displaying a failure of a fail-safe device provided in a conventional anti-skid device, a failure display in the device is collectively displayed by a display means such as one display lamp. It is common to use an individual display method for displaying where a failure has occurred in a method or apparatus using a plurality of display lamps or other display means, or both. The batch display method using one display lamp as described above has an advantage that display is simple, but has a drawback that it is not possible to display where a failure has occurred. The individual display method having the display lamps has the drawback that the display lamps serving as the display units are required by the number of failures to be displayed, so that a wide display unit is required and the circuit becomes complicated. According to the present invention, the details of the abnormality can be individually displayed by using a single display lamp provided in the in-vehicle electronic device having a self-diagnosis function to indicate that an abnormality has occurred, and the display by the display lamp can be reliably performed. It is an object of the present invention to provide a trouble display method. Means for Solving the Problems The present invention provides a self-diagnosis function having a self-diagnosis function of constantly checking for an abnormality such as disconnection or short-circuit of a component or a connection circuit and displaying the abnormality by turning on one warning light. In an in-vehicle electronic device such as a device, a lighting circuit of the warning light includes a first circuit that emits a lighting signal when an abnormality is detected, and a combination of lighting and extinguishing indicating a location where the self-diagnosis function detects an abnormality. When the self-diagnosis function detects an abnormality and the first circuit is turned on and the warning light is turned on, a dual system with the second circuit that emits an encoded blinking signal is issued. The first circuit of the warning light is turned off by the command signal of the operation switch that issues a command signal requesting display, and the point where the self-diagnosis function detects an abnormality in the second circuit is determined by the warning light. Light on and off It is characterized in that it is individually displayed by an encoded blinking operation composed of a combination of lights. According to the above, when an abnormality occurs in an on-vehicle electronic device such as an anti-skid device and a control circuit thereof, the first circuit is turned on, a warning light is lit, and the occurrence of the abnormality is notified to a driver. For example, when a repair worker operates an operation switch and issues a command signal during repair, the first circuit is turned off and switched to the second circuit, and a warning light performs a flashing operation coded, and the repair work is performed. In this way, a single warning lamp can be used to both display the abnormalities collectively and individually display the details of the abnormalities. In addition, when the blinking circuit of the warning light is a dual system of the first circuit for collectively displaying the abnormality and the second circuit for individually displaying the content of the abnormality, for example, when the abnormality occurs, the first circuit is disconnected. When a failure such as occurs, the driver operates the operation switch to activate the second circuit, so that the driver can be notified of the occurrence of an abnormality. Even if one of the circuits fails, the other circuit operates, for example, the first circuit performs the collective display of abnormalities, but the reliability of the abnormal display can be improved. Embodiment An embodiment of the present invention will be described with reference to the accompanying drawings. In FIG. 1, reference numeral 1 denotes a control circuit of an anti-skid device mounted on an automobile. The control circuit 1 operates a master cylinder 3 when a brake pedal 2 is depressed to activate a brake device for each wheel 4 from the master cylinder 3. 5 (only one wheel is shown and the others are omitted), when the hydraulic pressure is supplied and the wheel speed is reduced with respect to the vehicle speed, the wheel speed reduction rate obtained from the wheel speed sensor 6 becomes a certain value. At this time, the pressurizing valve of the hydraulic unit 7 provided in the brake hydraulic pressure pipe system is closed to start a holding signal for holding the hydraulic pressure in the brake device 5 to bring the braking force into a holding state, and despite that, the wheel speed is reduced. When the pressure drops to a certain value, the pressure reducing valve of the hydraulic unit 7 is actuated to generate a pressure reducing signal for reducing the hydraulic pressure in the brake device 5 to bring the braking force into a reduced state. When the degree of decrease reaches the minimum value, the pressure reduction signal is stopped and the braking force is held, and then when the wheel speed increases due to the road surface reaction force and recovers to a position close to the vehicle body speed, the hydraulic unit 7
Is opened to generate a pressurizing signal for increasing the hydraulic pressure in the brake device 5 stepwise to generate a braking force again. Thus, the pressurizing and depressurizing of the hydraulic pressure in the brake device 5 are repeated. A brake fluid pressure control command is issued so as to obtain an appropriate vehicle deceleration in the control pattern. Since the above-described anti-skid control is the same as the conventionally known one, the detailed description above is omitted. Control circuit 1 for performing anti-skid control as described above
Has a self-diagnosis function to check for abnormalities such as disconnection or short-circuit of various devices and connection circuits of the anti-skid device (the self-diagnosis function is also known from the prior art, so a detailed description is omitted). Drive circuit A, which turns on when an abnormality such as a short circuit or short circuit occurs, and the potential of the output terminal 1a switches from the ground potential to the power supply potential. Conversely, the potential of the output terminal 1b changes from the power supply potential to the relay drive circuit A. A warning light drive circuit B for switching to the ground potential is provided. The output terminal 1a of the relay drive circuit A is connected to a relay coil of the relay 8.
8a is connected to the power supply 9 via the relay 8a, and the normally open contact NO of the relay 8
Since the common contact c is connected to the power supply 9 and the hydraulic unit 7, respectively, when an abnormality such as disconnection or short circuit occurs and the potential of the output terminal 1a is switched to the power supply potential, the relay coil 8a is energized. Since the circuit is turned off, the circuit from the power supply 9 to the hydraulic unit 7 is turned off, whereby the anti-skid control is stopped and the brake fluid pressure is directly supplied from the master cylinder 3 to the brake device 5 of each wheel 4 (hereinafter referred to as normal). Brake state)
Further, since the output terminal 1b of the warning light drive circuit B is connected to the power supply 9 via the warning light 10, when an abnormality such as disconnection or short-circuit occurs and the potential of the output terminal 1b is switched to the ground potential, the power supply 9 is turned off. The circuit from to the ground through the warning light 10 is closed, the warning light 10 is lit, and the anti-skid control is stopped to inform the occupant that the vehicle is in the normal braking state. A circuit from the output terminal 1b that switches from the power supply potential to the ground potential when an abnormality such as a disconnection or short circuit occurs, as well as a display of where the abnormality occurred in the skid device, and a circuit from the output terminal 1b to the power supply 9 via the warning light 10. Is only a single system, so if a failure such as a disconnection occurs in the circuit, the self-diagnosis function will stop the anti-skid control and inform the occupant of the fact that the system has shifted to the normal braking state. It has a problem that can not be. Therefore, in the present invention, as shown in FIG. 1, a grounding circuit 11 for grounding the normally closed contact NC of the relay 8 and a common contact C of the relay 8 are connected to the output of the warning light drive circuit B via the current backflow prevention element 12. A connection circuit 13 for connecting to the terminal 1b is provided to constitute a warning light lighting circuit from the power supply 9 to the ground through the warning light 10, the connection circuit 13, and the grounding circuit 11, which is referred to as a first circuit. The circuit for controlling lighting of the warning light 10 by the warning light driving circuit B is a second circuit, so that the lighting circuit of the warning light is a dual system of the first circuit and the second circuit, and the self-diagnosis is performed. Output terminal of relay drive circuit A when an abnormality is detected by
When the potential of 1a is switched from the ground potential to the power supply potential, the relay 8 is switched to the normally closed contact NC side, the first circuit is closed, the warning light 10 is lit, and the driver is notified of the occurrence of abnormality. I am trying to do it. The control circuit 1 is provided with a check terminal condition input circuit (E) 14 and a check terminal 15, and when the warning lamp 10 is turned on by the first circuit, the check terminal 15
Enter the check command condition in (e.g. power supply voltage
By adding 12 volts), the potential of the output terminal 1a of the relay drive circuit A is changed from the power supply potential to the ground potential, whereby the relay 8 is switched to the normally open contact NO side to turn off the first circuit. Also, the output terminal 1b of the warning light drive circuit B
The second circuit is repeatedly turned on and off by switching the potential of the switch between the ground potential and the power supply potential to turn on the warning light.
As shown in FIG. 3, the flashing of 10 and the point at which the control circuit 1 determines that there is an abnormality in the self-diagnosis are performed by turning on the warning lamp 10 for a short time t ₂ (for example, 0.5 seconds) and for a long time t ₄ (for example, 1 (Seconds) are individually displayed by an encoded blinking operation composed of a combination of lighting. Time t ₁ until the input after the warning light 10 a check command condition check terminal 15 starts flashing operation of encoding in the above may be any time of several seconds from zero, and turns off the time interval t between each lighting ₃ can easily break and be the same as the short term lighting time t ₂ has been confirmed by experiments. Note for example the three lighting display as shown in FIG. 3 in the case of using the flashing operation of encoding comprising a combination of short-term t ₂ lit warning lamp 10 and a long period of time t ₄ lit as an abnormal content display pattern that can be displayed in the eight When using (2 ^triplicate), not to mention also the oversight Ya the coded flashing operation downtime t ₅ (e.g. 3 seconds) the driver when to repeat at a False positives can be prevented. FIG. 2 is a flow chart showing the above-described process. If the driver confirms the details of the abnormality and then erases the abnormal contents memory under conditions such as inputting to the check terminal 15, the entire procedure is completed and the initial state is returned. In the above embodiment, the example in which the relay 8 is shared with the contact circuit of the relay that shuts off the power supply circuit to the hydraulic unit 7 has been described. If the power supply circuit to the hydraulic unit 7 is cut off by the circuit and the warning lamp lighting circuit is formed by the other circuit, the current backflow prevention element 12 can be omitted. In the above embodiment, an example in which the present invention is applied to an anti-skid device as an on-vehicle electronic device has been described, but it is needless to say that the present invention can be applied to any on-vehicle electronic device such as a control device for a variable damping force type hydraulic shock absorber. As described above, according to the present invention, in a vehicle-mounted electronic device such as an anti-skid device having a self-diagnosis function of displaying an abnormality such as a disconnection or a short circuit by turning on a single warning light, A first circuit for generating a lighting signal when an abnormality is detected, and a second circuit for generating an encoded blinking signal comprising a combination of lighting and extinguishing indicating a location where the self-diagnosis function has detected an abnormality. When the self-diagnosis function detects an abnormality and the first circuit is turned on to turn on the warning lamp, the operation switch for issuing a command signal requesting display of the contents of the abnormality is provided. In response to a command signal, the first circuit of the warning light is turned off, and the portion where the self-diagnosis function detects an abnormality in the second circuit is coded blinking comprising a combination of turning on and off the warning light. By operation When an abnormality occurs, the first circuit is turned on and a warning lamp is lit to notify the driver of the occurrence of an abnormality. , The first circuit is turned off and the circuit is switched to the second circuit, the warning light performs a coded blinking operation, and the repair operator is notified of the location where the abnormality has occurred. As described above, both the collective display of the abnormality and the individual display of the content of the abnormality can be performed by one warning light. In addition, since the lighting circuit of the warning lamp has a dual system of the first circuit for collectively displaying the abnormalities and the second circuit for individually displaying the details of the abnormalities, even if one of the circuits fails, the other circuit becomes the other. Since the circuit works, the reliability of the abnormal display can be enhanced, and thus a great effect can be obtained in practical use.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing one embodiment of the present invention, FIG. 2 is a flowchart showing a control mode of the circuit in FIG. 1, and FIG. 3 is a check terminal input and a relay drive circuit output. 6 is a time chart showing a relation among a terminal potential, a warning light drive circuit output terminal potential, and a warning light blinking state. 1 ... control circuit, 2 ... brake pedal, 3 ... master cylinder, 4 ... wheels, 5 ... brake device, 6 ... wheel speed sensor, 7 ... hydraulic unit, 8 ...
Relay, 9 Power supply, 10 Warning light, 11 Ground circuit,
12: Current backflow prevention element, 13: Connection circuit, 14: Check terminal input condition circuit, 15: Check terminal.

Claims (1)

(57) [Claims] In an in-vehicle electronic device having a self-diagnosis function of constantly checking for an abnormality such as a disconnection or a short circuit of a component part or a connection circuit and displaying the abnormality by lighting one warning light, the lighting circuit of the warning light may A dual circuit of a first circuit that emits a lighting signal upon detection and a second circuit that emits an encoded blinking signal comprising a combination of lighting and extinguishing indicating a location where the self-diagnosis function has detected an abnormality. At the same time, when the self-diagnosis function detects an abnormality and turns on the warning light in the first circuit, the command signal of the operation switch that issues a command signal requesting display of the content of the abnormality is given by the command signal of the warning light. The first circuit is turned off, and the point where the self-diagnosis function detects an abnormality in the second circuit is individually displayed by a coded blinking operation composed of a combination of turning on and off the warning light. Specially Failure display method of an in-vehicle electronic devices to. 2. The in-vehicle electronic device is a control circuit of the anti-skid device, and when the power supply to the anti-skid device is cut off when the abnormality is detected, the first circuit is turned on to turn on the warning lamp, In response to a command signal from a switch, the first circuit is turned off, and the second circuit constituted by a warning light driving circuit provided in a control circuit of the anti-skid device emits a coded blinking signal to issue a warning. The first aspect of the invention is characterized in that the lamp is operated to blink.
3. A method for displaying a failure of an in-vehicle electronic device according to the item [1].