JP3276250B2 - Anti-skid device failure detection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-skid device for an automobile (hereinafter referred to as an ABS device), and more particularly to an ABS device.
The present invention relates to a method for detecting a failure of an alarm lamp circuit or a main relay circuit of a device.

[0002]

2. Description of the Related Art An ABS device for a vehicle is provided with a solenoid valve in a passage for transmitting brake pressure in a master cylinder operated by a brake pedal to a wheel cylinder of each wheel, and the wheels are brought into a skid state by rapid braking. When approaching, the brake pressure is alternately reduced and increased by the solenoid valve to prevent the wheels from being in a skid state and to maintain a stable running property.

[0003] The ABS device has a self-diagnosis function (hereinafter simply referred to as a controller) having a self-diagnosis function capable of detecting any abnormality in the system, and the main relay and the motor relay are turned off.
F inhibits the anti-skid control, turns on the alarm lamp, and returns to the normal braking function.

[0004]

In the conventional ABS system, the circuit is made redundant so that the alarm lamp can be turned on by both the controller and the main relay (for example, Japanese Patent Application Laid-Open No. 1-178068). However, if the main relay and the alarm lamp are disconnected, the alarm lamp cannot be turned on by the main relay, while if the controller and the alarm lamp are disconnected, the controller will not turn on the alarm lamp. become unable. The disconnection of these circuits could not be detected by the controller unless a special circuit was set separately.

In a normal vehicle, the warning lamp is initially turned on for a certain time immediately after the ignition switch is turned on to confirm that the warning lamp has run out. Using the initial lighting period, the initial lighting of the alarm lamp may be divided into a lighting period by the controller and a lighting period by the main relay, and a method of determining a fault location may be considered. That is, it is a method of determining whether a disconnection has occurred between the main relay and the alarm lamp or a disconnection between the controller and the alarm lamp based on the number of times the alarm lamp blinks. However, in this method, the main relay is frequently turned ON / OFF.
The relay is turned off, which is not preferable from the viewpoint of the durability and reliability of the main relay.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of detecting a failure in an ABS device that can detect a failure in a circuit by using the initial lighting of an alarm lamp without frequently turning on / off a main relay. is there. Also, for other purposes,
An object of the present invention is to provide an ABS device failure detection method capable of detecting a circuit failure of a main relay by a combination of lighting by a controller and lighting by a main relay.

[0007]

In order to achieve the above object, a first aspect of the present invention is to connect one end of an alarm lamp to a controller and a main relay individually, and for a certain period immediately after the main power is turned on. Only the alarm lamp is turned on initially, and the above-mentioned initial lighting consists of lighting by the controller and lighting by the main relay, and lighting by the main relay is made continuous lighting shorter than the initial lighting period, and lighting by the controller is turned on by the main relay. It consists of blinking during the period and continuous lighting during the non-lighting period by the main relay. Also, the second invention is
The initial lighting of the alarm lamp is constituted by the lighting by the controller and the lighting by the main relay, and the voltage of the circuit connecting the alarm lamp and the main relay is monitored during the non-lighting period by the controller and the lighting period by the main relay. Thereby, the failure of the main relay circuit is determined at once. Further, in the third invention, the initial lighting of the alarm lamp is constituted by lighting by the controller and lighting by the main relay, and during the first period immediately after the start of the initial lighting, the lighting by the controller and the lighting by the main relay are performed. Performed simultaneously, the second after the first period
During the period, only the lighting by the main relay is performed, and the voltage of the circuit connecting the alarm lamp and the main relay is monitored during the first period and the second period, so that the failure of the main relay circuit is separately determined. is there.

[0008]

In the first invention, the initial lighting of the alarm lamp is constituted by lighting by the controller and lighting by the main relay, and the lighting by the main relay is set to continuous lighting shorter than the initial lighting period, and the lighting by the controller is performed by the main relay. It consists of blinking during the lighting period and continuous lighting during the non-lighting period by the main relay. That is,
When a disconnection occurs between the main relay and the alarm lamp, a blink signal is output. When a disconnection occurs between the controller and the alarm lamp, the lighting time is shorter than the initial lighting time. Since the blinking pattern differs depending on the disconnection location,
The disconnection location can be easily determined. Moreover, since the main relay does not need to be repeatedly turned ON / OFF frequently, the durability reliability of the relay is improved. Further, in the second invention, the first
Similarly to the invention of the first aspect, the initial lighting is constituted by lighting by the controller and lighting by the main relay, and the voltage of the circuit connecting the alarm lamp and the main relay during the non-lighting period by the controller and the lighting period by the main relay. Is being monitored. That is, when the ground circuit of the main relay is disconnected or when the main relay is short-circuited to the power supply side, the monitor voltage is different from the normal state, so that the failure of the main relay circuit can be determined collectively. Further, in the second invention, it is impossible to determine whether the ground circuit of the main relay is disconnected or the main relay is short-circuited to the power supply side, whereas in the third invention, during the first period immediately after the start of the initial lighting, The lighting by the controller and the lighting by the main relay are performed simultaneously, and only the lighting by the main relay is performed during the second period after the first period, and the alarm lamp and the main relay during the first and second periods are connected. Monitors the voltage of the connecting circuit. Therefore, if there is an abnormality during the first period, it is possible to determine that the main relay is short-circuited, and if there is an abnormality during the second period, it is possible to determine that the grounding circuit of the main relay is broken.

[0009]

FIG. 1 is a system diagram of a vehicle ABS apparatus according to the present invention. In the figure, reference numeral 1 denotes a controller composed of a microcomputer or the like, which supervises the system and diagnoses a failure. Reference numeral 2 denotes an on-vehicle battery, 3 denotes a brake switch that is turned on in response to operation of a brake pedal, and 4 denotes a brake lamp that notifies an operation state of the brake pedal. When the brake pedal is depressed, the brake switch 3 is turned on and the brake lamp 4 is turned on. Lights up. ON / OFF signal of the brake switch 3 is input to the T ₁ terminal of the controller 1. Reference numerals 5, 6, 7, and 8 denote wheel speed sensors that independently detect the wheel speeds of the four wheels, and detection signals from these sensors 5 to 8 are input to the controller 1, respectively.

Reference numeral 10 denotes a pump motor, which drives a pump for pumping the brake fluid of the reservoir to the dynamic pressure side. The normally open contact 11 a of the motor relay 11 is connected in series with the pump motor 10, and the signal of the pump motor 10 is input to the T ₂ terminal of the controller 1. The coil 11b of the motor relay 11 is controlled by T ₃ terminal of the controller 1. The G terminal of the controller 1 is connected to the vehicle body and is always grounded. B of controller 1
The voltage of the battery 2 is constantly input to the terminal, and when any failure is detected, the ignition switch 12 is turned off.
The fault code is backed up so that the fault code can be stored in the memory in the controller 1 even after the F is executed.

[0011] 12 is an ignition switch which is the main power switch, the signal of the ignition switch 12 is inputted to the T ₄ terminal of the controller 1. The ignition switch 12 is connected in series with the alarm lamp 13, and further via a diode 14.
5 are connected in series to the contact 15a. Main relay 15
When a failure occurs in the ABS system, the alarm lamp 13 is turned on, and at the same time, the solenoid valve 20 described later is turned off to return to the normal braking function. The alarm lamp 13 is also connected to a W terminal for lamp control of the controller 1, and by turning on the W terminal (internal conduction with the G terminal), the alarm lamp 13 can be turned on regardless of the main relay 15. it can. The coil 15b of the main relay 15 is controlled by the R terminal of the controller 1. When the coil 15b is not energized, the contact 15a is grounded (OFF), and the alarm lamp 13 is turned on. When the coil 15b is energized, the contact 15a is turned on and the alarm lamp 13 is turned off.

The diode 14 is connected to a circuit via a connector 21.
1 is detachable. Therefore, the diode 14
Is removed from the connector 21, the alarm lamp 1
3 and the main relay 15 can be electrically opened. The contact 15 between the diode 14 and the main relay 15
The connection between a and a is connected to the coil 11b of the motor relay 11, the solenoid valve 20, and the monitoring M terminal of the controller 1. The solenoid valves 20 are valves for decreasing or increasing the brake pressure, for example, two solenoid valves are provided for each wheel, for a total of eight solenoid valves. The downstream side of the solenoid valve 20 is connected to the controller 1. Therefore, when the main relay 15 is turned off, the motor relay 11 and the solenoid valve 20 are also turned off.
FF is performed, and the voltage of the M terminal also becomes L level. When the main relay 15 is turned ON, the motor relay 11 and the solenoid valve 20 are in an operable state for the first time, and the voltage of the M terminal becomes the H level.

FIG. 2 is a time chart showing a method for detecting a disconnection failure of the alarm lamp circuit as an example of the first invention. As described above, the ground side of the alarm lamp 13 is connected to the W terminal of the controller 1 and the contact 15a of the main relay 15, and the circuit is made redundant so that the alarm lamp 13 can be turned on by either the controller 1 or the main relay 15. Has been made. However, if a break occurs in the circuit 16 between the alarm lamp 13 and the W terminal of the controller 1, the circuit 17 between the alarm lamp 13 and the main relay 15, or the grounding circuit 18, the alarm lamp by the controller 1 or the main relay 15 is disconnected. 13 cannot be turned on.

When the ignition switch 12 is turned on, the alarm lamp 13 is initially turned on for a predetermined time (for example, about 3 seconds) to confirm that the alarm lamp 13 has run out. Therefore, in this embodiment, the initial lighting of the alarm lamp 13 is constituted by the lighting by the main relay 15 and the lighting by the controller 1, and the lighting by the main relay 15 is continuous lighting (for example, one second) shorter than the initial lighting period. 1 is constituted by blinking during the lighting period by the main relay 15 and continuous lighting during the non-lighting period by the main relay 15, so that the circuits 16, 17, 1 are formed.
8 are detected. That is, as shown in FIG. 2, immediately after the start of the initial lighting, the W terminal of the controller 1 is switched to the time t _1.
After turning on / off a plurality of times until the initial lighting period is over, the device is continuously turned on until the initial lighting period ends. On the other hand, R terminals immediately after the initial start of lighting is OFF, causing continuous ON at time t ₂ after the W terminal is continuously ON.

Thus, if the circuits 16, 17, 18 are normal, the alarm lamp 13 as shown by W / L (1) in FIG.
Lights up during the initial lighting period, but the controller side circuit 16
There when is broken, from immediately after the initial lighting start to time t ₂ lights continuously as in FIG. 2 W / L (2), thereafter is turned off. On the other hand, the main relay side circuits 17, 18
There when is broken, repeatedly flashing immediately after initial lighting start to time t ₁ as in FIG. 2 W / L (3),
Thereafter, continuous lighting is performed until the end of the initial lighting. This makes it easy to determine which of the circuits 16, 17, and 18 is disconnected. Further, in the above failure detection, the R terminal only needs to be turned ON once, so that the number of times of ON / OFF of the main relay 15 is only one, and the main relay 15 is turned ON.
5 can be improved in durability reliability.

FIGS. 3 and 4 are flow charts of disconnection detection in FIG. FIG. 3 shows a main routine. When the ignition switch 12 is turned on, system initial processing such as memory check, initial value setting, and initial lighting of an alarm lamp is first performed, and then system control processing such as ABS control is repeatedly performed. .

FIG. 4 shows the contents of the system initial processing. First, the countdown of the timer is stopped (S ₁ ), the R terminal of the controller 1 is turned off (S ₂ ), and the W terminal is turned on (S ₃ ). Then, the number of blinks is set to 0 (S ₄ ),
Sets the timer value T _ON1 (S _5), actuates the countdown timer (S _6). T _ON1 is the ON time during the blinking period of the W terminal. Then, the timer value is compared with 0 (S _7), 0 when greater than continued timer countdown, the timer value becomes 0 (T _ON1 hours later),
Subsequently W terminal determines whether the OFF or is ON (S _8). Since the first W terminal is turned ON, subsequently W terminal and OFF by (S _9), comparing the number of blinks and N values (S _10). This value N is a prescribed value of the number of blinks, and is set to three times in the example of FIG. If the number of blinks is less than N, the timer value is set to T _OFF1 (S ₁₁ ), and the process returns to step S ₇ . T _OFF1 is O during the blinking period of the W terminal.
FF time. Further, when W terminal is OFF in step S _8, and ON the W terminal (S _12), the number of blinks is added once (S _13), the number of flashes which are further added N
Compared to the value (S _14). If the number of blinks is less than N, the timer value is set to T _ON1 again (S ₁₅ ), and the process returns to step S ₇ . On the other hand, in step S _14, the number of flashes is N times, and sets the timer value T _ON2 (S _16), and ON the R terminal (S _17), the flow returns to step S _7. T _ON2 is the ON time during the continuous lighting period of the W terminal. After step S _17, and performs step S ₇ to S _10, since the number of flashes in step S ₁₀ it is N times,
Stop the countdown timer (S _18), to the end.

FIG. 5 is a time chart showing a method for detecting a failure of the main relay circuit according to the second and third inventions. If the main relay grounding circuits 17 and 18 are disconnected, or if the main relay 15 is short-circuited (for example, the contact 15
(a), the alarm lamp 13 cannot be turned on by the main relay 15. Therefore, in this embodiment, the voltage of the M terminal is monitored while the W terminal of the controller 1 is OFF and the R terminal is OFF, that is, during the non-lighting period by the controller 1 and the lighting period by the main relay 15. And diagnoses a failure of the main relay circuit.

In FIG. 5, if the main relay circuit is normal, the M terminal is at the L level when the R terminal is OFF, as in M (1), and the M terminal is turned on when the R terminal is turned on (time t ₂ ). The terminal also goes high, whereas if the main relay ground circuits 17 and 18 are disconnected, the M terminal is turned off at time t ₃ and the M terminal is turned off at time t ₃ as shown in M (2). There becomes H level, then become W terminal and the opposite voltage level, the time t ₂ after that maintains the H level. Also,
In the case of a short-circuit failure of the main relay 15, M (3)
Ignition switch 1
2 turns ON and the M terminal goes to the H level at the same time.
Maintain levels. Therefore, if the M terminal is at the H level when the W terminal is OFF and the R terminal is OFF,
It is possible to detect that the main relay ground circuits 17 and 18 are disconnected or short-circuited. If the W terminal is set to ON and the R terminal is set to OFF when the ignition switch 12 is turned on, a short circuit failure may occur if the voltage of the M terminal when the ignition switch is turned ON is at the H level. Can be determined, and then the W terminal is
If the M terminal goes high when the F and R terminals are turned off, it can be determined that the main relay grounding circuits 17 and 18 have been disconnected. In FIG. 5, the W terminal is turned on / off (alarm lamp blinks) immediately after the ignition switch 12 is turned on, but such an operation is not always necessary. In short, when the ignition switch 12 is turned on, first, the W terminal is turned on, and the R terminal is turned off.
And then turn W terminal OFF and R terminal OFF
Then, if the R terminal is turned on after that, by monitoring the voltage of the M terminal during that time, it is possible to diagnose whether the main relay circuit is normal or which part has a failure.

FIG. 6 schematically shows a failure diagnosis of the main relay circuit. First, after turning ON the ignition switch 12 (S _20), the W terminal is turned ON (S _21), OFF the R terminal
To (S _22). Then, the voltage of the M terminal is monitored (S
_23), if H level is determined to be a short circuit failure of the main relay 15 (S _24). On the other hand, M in the step S ₂₃
If the voltage of the terminal is at the L level, OFF and (S ₂₅₎ the W terminal, monitors the voltage of the M terminal (S _26). If the voltage of the M terminal is at the H level, the main relay grounding circuit 1
7, 18 is determined to have broken (S _27), if the L level, followed by turning ON the R terminal (S _28). Then, monitoring the voltage at the terminal M (S _29), if H level, the main relay circuit is normal (S _30), if L level other fault (e.g. disconnection of monitor circuit 19, etc.) It judged to be occurring (S _31).

FIG. 7 shows a method of diagnosing a failure of the main relay circuit according to the second invention, in particular, a ground circuit 18 of the main relay 15.
A specific processing method for collectively determining the disconnection of the main relay 15 and the short-circuit failure of the main relay 15 will be described. Note that the system initial processing performed before this processing is the same as that in FIG. First, the countdown of the timer 1 is stopped ( _S32 ), and the countdown of the timer 2 is stopped ( _S33 ). Timer 1 is a timer for failure diagnosis of the alarm lamp circuit, and timer 2 is a timer for short failure diagnosis of the main relay 15. Subsequently, the R terminal of the controller 1 is turned off ( _S34 ), and the W terminal is turned on ( _S35 ). Then, the number of blinks is set to 0 ( _S36 ),
The timer 1 value is set to T _ON1 (S ₃₇ ), and the countdown of the timer 1 is operated (S ₃₈ ). T _ON1 is the ON time during the blinking period of the W terminal. Next, disconnection or detection process of the main relay short-circuit failure of the main relay ground circuit 17 performs processing (see FIG. 8) (S _39), compares then the timer 1 value 0 (S _40), 0 when greater than continued timer countdown, the timer 1 value becomes 0 (T _ON1 hours later), followed by W terminal determines whether the OFF or is oN (S _41). Since the W terminal is initially ON, the W terminal is subsequently turned OFF ( _S42 ), and the number of blinks is compared with the N value ( _S43 ). This value N is a prescribed value of the number of blinks, and is set to three times in the example of FIG. If the number of flashes is less than N times, sets the timer 1 value T _OFF1 (S _44), the flow returns to step S _39. T _OFF1 is the OFF time in the blinking period of the W terminal. If the W terminal is OFF in step _S41 , the W terminal is turned ON ( _S45 ), the number of blinks is added once ( _S46 ), and the added number of blinks is compared with the N value ( _S46 ). _S47 ). If the number of flashes is less than N times, sets the timer 1 value again T _ON1 (S _48), the flow returns to step S _39. On the other hand, in step S _47, the number of flashes is N times, sets the timer 1 value T _ON2 (S _49), ON the R terminal and (S _50), the flow returns to step S _39. T _ON2 is W
This is the ON time during the continuous lighting period of the terminal. After step S _50, and performs step S ₃₉ to S _43, step S ₄₃
Since the number of blinks is N, the countdown of the timer 1 is stopped ( _S51 ), the countdown of the timer 2 is stopped ( _S52 ), and the process is terminated.

[0022] Figure 8 illustrates a specific method for detection processing of the short failure of the open or the main relay 15 of the main relay ground circuit 17 and 18 in FIG. 7 (S _39). First, it is determined whether the R terminal is ON or OFF ( _S53 ), and ON is performed.
In the case of (1), the process is terminated, and in the case of OFF, it is determined whether the timer 2 is operating or stopped ( _S54 ). When the timer 2 is stopped, monitors the M terminal (S _55), the voltage has finished processing if L level, if the H level to set the timer value 2 T _FL1 (S ₅₆ ), The countdown of the timer 2 is operated ( _S57 ). T _FL1 is a time for detecting a short-circuit failure of the main relay 15. If the timer 2 is operating in step _S54 , the voltage of the M terminal is monitored ( _S58 ). If the voltage is at the L level, the countdown of the timer 2 is stopped ( _S59 ), and the process is terminated. If it is at the H level, the timer 2 value is compared with 0 ( _S60 ). If it is larger than 0, the operation is terminated. ( _S61 ), all functions of the ABS system are stopped ( _S62 ). When all functions are stopped, the W terminal of the controller 1 is turned ON and the R terminal is turned OFF at the same time.

FIG. 9 shows a method of diagnosing a failure of the main relay circuit according to the third invention, in particular, the main relay ground circuits 17 and 18.
A specific processing method for separately determining the disconnection and the short-circuit failure of the main relay 15 will be described. The system initial processing prior to this processing is the same as that in FIG. First, timer 1, timer 2, the countdown timer 3 respectively stopped (S ₆₃ ~S _65). Timer 1 is a timer for failure diagnosis of the alarm lamp circuit, timer 2 is a timer for short failure diagnosis of the main relay 15, and timer 3 is a main relay grounding circuit 17,1.
8 is a timer for failure diagnosis. Next, the R terminal of the controller 1 is turned off ( _S66 ), and the W terminal is turned on ( _S67 ). Then, the number of blinks is set to 0 ( _S68 ),
The timer 1 value is set to T _ON1 (S ₆₉ ), and the timer 1 counts down (S ₇₀ ). T _ON1 is the ON time during the blinking period of the W terminal. Next, the timer 1 value is compared with 0 (S ₇₁ ). If it is greater than 0, the timer countdown is continued. If the timer 1 value becomes 0 (T _ON1 time has elapsed), then whether the W terminal is ON. It is determined whether the switch is OFF ( _S72 ). Since the W terminal is ON at first, after the W terminal is turned OFF ( _S73 ), the main relay short-circuit failure detection processing is performed ( _S74 ). This processing is the same as that in FIG. After completing the processing of S _74, it compares the number of blinks and N values (S _75). This value N is number of flashes specified value, when the number of flashes is less than N times, sets the timer 1 value T _OFF1 (S _76),
Back to step S _71. T _OFF1 is the OFF time in the blinking period of the W terminal. If the W terminal is OFF in step _S72 , after the W terminal is turned ON ( _S77 ),
A failure detection process for the main relay ground circuits 17 and 18 shown in FIG. 10 is performed ( _S78 ). Thereafter, the number of blinks is added once ( _S79 ), and the added number of blinks is compared with the N value ( _S80 ). If the number of blinks is less than N, the timer 1 value is set to T _ON1 again (S ₈₁ ), and the process returns to step S ₇₁ . On the other hand, in step S _80, the number of flashes is N times, sets the timer 1 value T _ON2 (S _82), and ON the R terminal (S _83), the flow returns to step S _71. T _ON2 is W
This is the ON time during the continuous lighting period of the terminal. After step S _83, and performs step S ₇₁ to S _75, step S ₇₅
Since the number of blinks is N in the above, the countdown of the timer 1, the timer 2, and the timer 3 is stopped ( _S84 to _S84 ).
_S86 ), the process ends.

FIG. 10 shows a specific method of the disconnection detection processing (S ₇₈ ) of the main relay ground circuits 17 and 18 in FIG. First, it is determined whether the R terminal is ON or OFF ( _S87 ). If it is ON, the process is terminated. If it is OFF, it is determined whether the timer 3 is operating or stopped ( _S88 ). . If the timer 3 is stopped, the M terminal is monitored (S ₈₉ ). If the voltage is at the L level, the process is terminated. If the voltage is at the H level, the timer value 3 is set to T _FL2 (S _90). ), The countdown of the timer 3 is activated (S
₉₁ ). T _FL2 is a time for detecting a disconnection failure of the ground circuit 18. When the timer 3 is operating in step _S88 , the voltage of the M terminal is monitored ( _S92 ). If the voltage is at the L level, the countdown of the timer 3 is stopped ( _S93 ), and the process is terminated. Timer 3 if H level
The value is compared with 0 ( _S94 ), and when it is larger than 0, the processing is terminated,
If it becomes 0, the diagnostic code of the ground circuit disconnection is stored ( _S95 ), and all the functions of the ABS system are stopped ( _S96 ). When stopping all functions, the controller 1
Is turned on and the R terminal is turned off.

[0025]

As is apparent from the above description, according to the first aspect, the initial lighting of the alarm lamp is divided into a lighting period by the controller and a lighting period by the main relay, and the blinking pattern is changed. Therefore, the disconnection of the alarm lamp circuit can be easily determined by the lighting or blinking operation of the alarm lamp, and there is no need to provide a special detection circuit. Further, since lighting by the main relay is performed only once, frequent ON / OFF of the main relay is eliminated, and the durability reliability of the main relay can be improved. Further, in the second invention, during the non-lighting period by the controller and the lighting period by the main relay,
Since the voltage of the circuit connecting the alarm lamp and the main relay is monitored, the disconnection failure of the ground circuit of the main relay and the power supply side short-circuit failure of the main relay can be detected at a time. Further, in the third invention, during the first period immediately after the start of the initial lighting, the lighting by the controller and the lighting by the main relay are simultaneously performed, and only the lighting by the main relay is performed during the second period after the first period. Since the voltage of the circuit connecting the alarm lamp and the main relay during the first period and the second period is monitored, the short-circuit failure of the main relay and the disconnection of the ground circuit of the main relay can be reliably determined.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an ABS device for implementing the present invention.

FIG. 2 is a time chart illustrating a method for detecting a failure of the alarm lamp circuit according to the present invention.

FIG. 3 is a main routine diagram of the failure detection method according to the present invention.

FIG. 4 is a flowchart illustrating a method for detecting a failure of the alarm lamp circuit according to the present invention.

FIG. 5 is a time chart showing a method for detecting a failure of a main relay according to the present invention.

FIG. 6 is a schematic diagram showing a method for detecting a failure of a main relay according to the present invention.

FIG. 7 is a specific flowchart showing a method for detecting a failure of a main relay according to the present invention.

FIG. 8 is a flowchart illustrating a short-circuit failure detection process of the main relay of FIG. 7;

FIG. 9 is another flowchart illustrating the method for detecting a failure of the main relay according to the present invention.

FIG. 10 is a flowchart illustrating a failure detection process of the grounding circuit of the main relay of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Controller 12 Ignition switch 13 Alarm lamp 15 Main relay 17, 18 Grounding circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60T 8/88 B60T 8/96 B60T 17/22

Claims (3)

(57) [Claims] 1. An anti-skid device in which, when an abnormality occurs in an anti-skid control system, a main relay is turned off to prohibit the anti-skid control, and an alarm lamp is turned on. The anti-skid controller and the main relay are individually connected, and the alarm lamp is initially turned on for a certain period immediately after the main power is turned on. The initial lighting consists of lighting by the anti-skid controller and lighting by the main relay In addition, the lighting by the main relay is continuous lighting shorter than the initial lighting period, and the lighting by the anti-skid controller consists of blinking during the lighting period by the main relay and continuous lighting during the non-lighting period by the main relay. Because of the anti-skid device Fault detection method. 2. An anti-skid control system according to claim 1, wherein when an abnormality occurs in the anti-skid control system, the main relay is turned off to inhibit the anti-skid control and to turn on the alarm lamp. The anti-skid controller and the main relay are individually connected, and the alarm lamp is initially turned on for a certain period immediately after the main power is turned on. The initial lighting consists of lighting by the anti-skid controller and lighting by the main relay In addition, during the non-lighting period by the anti-skid controller and the lighting period by the main relay, the failure of the main relay circuit is diagnosed by monitoring the voltage of the circuit connecting the alarm lamp and the main relay. Anti-skid device failure Way out. 3. An anti-skid device in which, when an abnormality occurs in the anti-skid control system, the main relay is turned off to prohibit the anti-skid control and turn on an alarm lamp. The anti-skid controller and the main relay are individually connected, and the alarm lamp is initially turned on for a certain period immediately after the main power is turned on. The initial lighting consists of lighting by the anti-skid controller and lighting by the main relay At the same time, during the first period immediately after the start of the initial lighting, the lighting by the anti-skid controller and the lighting by the main relay are simultaneously performed. During the second period after the first period, only the lighting by the main relay is performed. Alarm lamp during the first and second periods By monitoring the voltage of the circuit connecting the main relay fault detection method of the anti-skid device, characterized in that for diagnosing a failure of the main relay circuit.