WO2023029977A1

WO2023029977A1 - Fault detection method and apparatus for vehicle relay group, and vehicle control system

Info

Publication number: WO2023029977A1
Application number: PCT/CN2022/112652
Authority: WO
Inventors: 周春雨; 刘元治; 张鑫; 马腾
Original assignee: 中国第一汽车股份有限公司
Priority date: 2021-08-30
Filing date: 2022-08-16
Publication date: 2023-03-09
Also published as: CN113702820A; CN113702820B

Abstract

A fault detection method and apparatus for a vehicle relay group, and a vehicle control system, wherein the method is executed by a vehicle controller, and the relay group comprises a main relay (10) and at least one first relay (20). The fault detection method for a vehicle relay group comprises: in response to a low-side drive signal not being provided for a coil (11) of a main relay (10), and the low-side drive signal being not provided for a coil (21) of a first relay (20), acquiring a first voltage signal at a static contact of the first relay (20) (S110); according to the first voltage signal, determining an adhesion fault between a moving contact and the static point of the first relay (20) (S120); in response to the moving contact and the static contact of the first relay (20) being in a non-adhered state, acquiring a second voltage signal at the static contact of the first relay (20) when the low-side driving signal is provided for the coil (21) of the first relay (20) and the low-side driving signal is not provided for the coil (11) of the main relay (10) (S130); and according to the second voltage signal, determining an adhesion fault between the moving contact and the static contact of the main relay (10) (S140).

Description

Fault detection method and device for vehicle relay group and vehicle control system

This application claims priority to a Chinese patent application with application number 202111007297.0 filed with the China Patent Office on August 30, 2021, the entire contents of which are incorporated herein by reference.

technical field

The embodiments of the present application relate to the technical field of fault detection of automobile body parts, for example, to a fault detection method and device for a vehicle relay set, and a vehicle control system.

Background technique

With the improvement of people's living standards, people consume more and more cars. Cars have become one of the important means of transportation for people, and the market for auto parts has become larger and larger. In recent years, auto parts manufacturers are also developing rapidly. There are many types of auto parts, including: engine parts, transmission parts, brake parts, steering parts and other parts. The control of many accessories mainly relies on relays, so fault detection for relays is very important.

In the related art, the fault diagnosis of the relay in the vehicle is mostly aimed at the fault detection of the relay driving end, that is, diagnosing faults such as open circuit and short circuit of the relay drive. When the relay itself is stuck or does not pick up, it cannot be detected. If the fault lasts for a long time, the load behind the relay will work abnormally. Especially for some special loads such as fuel heaters, the continuous fault may lead to safety accidents.

Contents of the invention

The present application provides a fault detection method and device for a vehicle relay group, and a vehicle control system, so as to realize fault detection of a relay body.

In the first aspect, the embodiment of the present application provides a fault detection method for a vehicle relay set, which is executed by a vehicle controller. The vehicle relay set includes a main relay and at least one first relay; the coil of the main relay is connected in series to the vehicle Between the power supply and the low-side driving end of the main relay of the vehicle controller; the movable contact of the main relay is electrically connected to the vehicle power supply, and the coil of each first relay is connected in series with the static contact of the main relay Between the low-side driving end of the first relay of the vehicle controller; the moving contact of each first relay is electrically connected to the vehicle power supply, and the static contact of each first relay is connected to the The signal acquisition end of the vehicle controller is electrically connected, and the fault detection method of the vehicle relay group includes:

Responsive to no low-side drive signal being provided to the coil of the main relay and no low-side drive signal being provided to the coil of each first relay, obtaining a first voltage signal;

According to the first voltage signal, determine the adhesion fault between the movable contact and the static contact of each first relay;

In response to the movable contact and the static contact of each first relay being in a non-adhesive state, a low-side drive signal is provided to the coil of each first relay, and a low-side drive signal is not provided to the coil of the main relay. When the signal is driven by the side, the second voltage signal at the static contact of each first relay is obtained;

According to the second voltage signal, it is determined that there is a sticking fault between the movable contact and the static contact of the main relay.

In the second aspect, the embodiment of the present application also provides a fault detection device for a vehicle relay set, the vehicle relay set includes a main relay and at least one first relay; the coil of the main relay is connected in series with the vehicle power supply and the vehicle Between the main relay low-side driving ends of the controller; the moving contact of the main relay is electrically connected to the vehicle power supply, and the coil of each first relay is connected in series with the static contact of the main relay and the vehicle control Between the first relay low-side drive terminals of the device; the movable contact of each first relay is electrically connected to the vehicle power supply, and the static contact of each first relay is connected to the signal of the vehicle controller The collection terminal is electrically connected, and the fault detection device of the vehicle relay group includes:

The first voltage signal acquisition module is configured to acquire each of the first voltage signal in response to the low-side driving signal not being provided to the coil of the main relay and the low-side driving signal being not provided to the coil of each first relay. a first voltage signal at a static contact of a relay;

The first fault detection module is configured to determine the adhesion fault between the movable contact and the static contact of each first relay according to the first voltage signal;

The second voltage signal acquisition module is configured to provide a low-side driving signal to the coil of the first relay in response to the movable contact and the static contact of each first relay being in a non-adhesion state, and not to all the first relays. When the main relay provides the low-side driving signal, obtain the second voltage signal at the static contact of each first relay;

The second fault detection module is configured to determine a sticking fault between the movable contact and the static contact of the main relay according to the second voltage signal.

Description of drawings

Fig. 1 is a schematic structural diagram of a vehicle relay group control circuit provided by an embodiment of the present application;

Fig. 2 is a flow chart of a fault detection method for a vehicle relay group provided in an embodiment of the present application;

Fig. 3 is a flow chart of another fault detection method for a vehicle relay group provided in an embodiment of the present application;

Fig. 4 is a flow chart of another fault detection method for a vehicle relay set provided in an embodiment of the present application;

Fig. 5 is a flow chart of another fault detection method for a vehicle relay set provided by an embodiment of the present application;

6 is a schematic structural diagram of a fault detection device for a vehicle relay set provided in an embodiment of the present application;

Fig. 7 is a schematic structural diagram of another fault detection device for a vehicle relay set provided by an embodiment of the present application.

Detailed ways

The application will be described in detail below in conjunction with the accompanying drawings and embodiments.

The embodiment of the present application provides a fault detection method of the vehicle relay group, which can detect the fault condition of the relay body, and the method can be executed by the fault detection device of the vehicle relay group provided in the embodiment of the present application. The device is realized by software and/or hardware, and the fault detection device of the vehicle relay group can be integrated in the vehicle controller.

Fig. 1 is a structural schematic diagram of a vehicle relay group control circuit provided by the embodiment of the present application. As shown in Fig. 1, the vehicle relay group 1 includes a main relay 10 and at least one first relay 20 (only two are shown in the figure The first relay, but not limited thereto); the coil 11 of the main relay 10 is connected in series between the main relay low-side driving end D1 of the vehicle power supply 30 and the vehicle controller 40; the movable contact of the main relay 10 is electrically connected with the vehicle power supply 30 , the coil 21 of the first relay 20 is connected in series between the static contact of the main relay 10 and the low-side driving end of the first relay of the vehicle controller 40, and different first relays correspond to different low-side driving ends of the first relay D2 , D3; the moving contact of the first relay 20 is electrically connected to the vehicle power supply 30, the static contact of the first relay 20 is electrically connected to the signal acquisition terminal of the vehicle controller 40, and different first relays correspond to different signal acquisition terminals C2, C3.

Exemplarily, the following embodiments are illustrated by taking the first relay 20 electrically connected to the fuel heater 50 in FIG. 1 as an example. When the movable contact and the static contact of the first relay 20 conduct, the fuel heater works. In Fig. 1, the first relay 20 electrically connected with the fuel heater 50 is electrically connected with the first relay low-side drive terminal D2 of the vehicle controller and the signal acquisition terminal C2 of the vehicle controller, and the following uses the first relay as an example for the vehicle The fault detection method of the relay group will be described.

Fig. 2 is a flow chart of a fault detection method for a vehicle relay group provided in an embodiment of the present application. As shown in Fig. 2 , the fault detection method for the vehicle relay group includes:

S110. When the low-side driving signal is not provided to the coil of the main relay and the low-side driving signal is not provided to the coil of the first relay, acquire a first voltage signal at the static contact of the first relay.

S120. According to the first voltage signal, determine a sticking fault between the movable contact and the static contact of the first relay.

Exemplarily, as shown in FIG. 1 , taking the main relay 10 and each first relay 20 respectively including a normally open switch as an example, when the low-side drive signal is not provided to the coil 11 of the main relay 10, and the first relay 20 is not provided When the coil 21 of the relay 20 provides the low-side drive signal, if there is no sticking failure between the movable contact and the static contact of the first relay 20, then the movable contact and the static contact of the first relay 20 should be in the disconnected state. The voltage signal provided by the power supply 30 cannot be transmitted to the signal acquisition terminal C2 of the vehicle controller 40 through the first relay 20; The movable contact and the static contact are in the conduction state, and the voltage signal provided by the vehicle power supply 30 can be transmitted to the signal acquisition terminal C2 of the vehicle controller 40 through the first relay 20 . Therefore, the first voltage signal at the static contact of the first relay 20 is obtained through the signal acquisition terminal C2 of the vehicle controller 40, and according to the first voltage signal, it can be determined whether the movable contact and the static contact of the first relay 20 are There is a sticking failure.

S130. If the movable contact and the static contact of the first relay are in a non-adhesive state, when the low-side driving signal is provided to the coil of the first relay and the low-side driving signal is not provided to the coil of the main relay, obtain the first Second voltage signal at the static contact of the relay.

S140. According to the second voltage signal, determine a sticking fault between the movable contact and the static contact of the main relay.

Exemplarily, if according to the first voltage signal, it is determined that the movable contact and the static contact of the first relay 20 are in a non-sticking state, that is, there is no sticking fault, then a low-side driving signal is provided to the coil 21 of the first relay 20, The low-side drive signal is not supplied to the coil 11 of the main relay 10 . If there is no adhesion fault between the movable contact and the static contact of the main relay 10, the movable contact and the static contact should be in the disconnected state, then the coil 11 of the first relay 10 cannot transmit the electric signal provided by the vehicle power supply 30, thus The moving contact 21 of the first relay 20 is disconnected from the static contact, and the voltage signal provided by the vehicle power supply 30 cannot be transmitted to the signal acquisition terminal C2 of the vehicle controller 40 through the first relay 20; on the contrary, if the moving contact of the main relay 10 If the contact and the static contact are in an adhesion state, then the movable contact and the static contact are in a conduction state, so that the coil 21 of the first relay 20 has an electric signal provided by the vehicle power supply 30 to flow through, and drives the movable contact of the first relay 20. The point and the static contact are turned on, so that the voltage signal provided by the vehicle power supply 30 can be transmitted to the signal acquisition terminal C2 of the vehicle controller 40 through the first relay 20 . Therefore, through the second voltage signal at the static contact of the first relay 20 , the sticking fault between the movable contact and the static contact of the main relay 10 can be determined.

The fault detection method of the vehicle relay group provided in the embodiment of the present application controls the supply of low-side driving signals to the main relay and at least one first relay, and detects the voltage signal at the static contact of the first relay, so as to detect the main relay and at least one first relay. The first relay realizes quick fault diagnosis, is simple and effective, and is easy to implement, and the fault detection method can be executed by a vehicle controller, thereby reducing software and hardware costs.

Optionally, FIG. 3 is a flowchart of another fault detection method for a vehicle relay set provided in an embodiment of the present application. As shown in FIG. 3 , the fault detection method for a vehicle relay set includes:

S210. When the low-side driving signal is not provided to the coil of the main relay and the low-side driving signal is not provided to the coil of the first relay, acquire a first voltage signal at the static contact of the first relay.

S220. Determine whether the first voltage signal is within the first preset range; if the first voltage signal is within the first preset range, execute S230; if the first voltage signal is not within the first preset range, execute S240.

S230. Determine that the movable contact and the static contact of the first relay are in a sticking state.

S240. Determine that the movable contact and the static contact of the first relay are in a non-adhesion state.

Exemplarily, when the low-side driving signal is not provided to the coil 11 of the main relay 10 and the low-side driving signal is not provided to the coil 21 of the first relay 20, the movable contact of the first relay 20 and the static contact In the case of no adhesion fault, the voltage signal provided by the vehicle power supply 30 cannot be transmitted to the signal acquisition terminal C2 of the vehicle controller 40, and at this time the signal acquisition terminal C2 of the vehicle controller 40 cannot obtain the voltage signal provided by the vehicle power supply 30 , when the first voltage signal acquired by the signal acquisition terminal C2 of the vehicle controller 40 is within the first preset range, it can be determined that the movable contact and the static contact of the first relay 20 are in a sticking state, that is, the vehicle power supply 30 provides The voltage signal is transmitted to the signal acquisition terminal C2 of the vehicle controller 40 through the movable contact and static contact of the first relay 20; and if the obtained first voltage signal is not within the first preset range, the first relay can be determined There is no adhesion failure between the moving contact and the static contact of 20. Exemplarily, the first preset range may be a range greater than 2V, which can ensure that the voltage signal received when the movable contact of the first relay 20 is stuck to the static contact is within the first preset range, while avoiding interference signals affect the fault detection results. The detection of the first voltage signal can be realized through the digital signal acquisition module in the vehicle controller 40, for example, when the first voltage signal is within the first preset range, the output detection result is "1", when the first voltage signal When it is not within the first preset range, that is, close to the reference ground level, the output detection result is "0", and the vehicle controller 40 can determine whether the movable contact and the static contact of the first relay 20 are in a sticking state according to the detection result.

S250. When the low-side driving signal is provided to the coil of the first relay and the low-side driving signal is not provided to the coil of the main relay, acquire a second voltage signal at the static contact of the first relay.

S260. Determine whether the second voltage signal is within the second preset range; if the second voltage signal is within the second preset range, execute S270; if the second voltage signal is not within the second preset range, execute S280.

S270. Determine that the moving contact and the static contact of the main relay are in a sticking state.

S280. Determine that the movable contact and the static contact of the main relay are in a non-adhesion state.

Exemplarily, if it is determined according to the first voltage signal that there is no sticking fault between the movable contact and the static contact of the first relay 20 , then it is determined whether there is a sticking fault between the movable contact and the static contact of the main relay 10 . On the basis of not providing the low-side driving signal to the main relay 10, the low-side driving signal can be provided to the coil 21 of the first relay 20, and if there is no adhesion fault between the moving contact and the static contact of the main relay 10, the second The coil 11 of a relay 10 will have no current flowing through it, then the movable contact and the static contact of the first relay 10 will be disconnected, and the voltage signal provided by the vehicle power supply 30 will not be transmitted to the signal acquisition terminal C2 of the vehicle controller 40, that is, the vehicle The signal acquisition terminal C2 of the controller 40 cannot acquire the voltage signal provided by the vehicle power supply 30 . Therefore, when the second voltage signal acquired by the signal acquisition terminal C2 of the vehicle controller 40 is within the second preset range, it can be determined that the movable contact and the static contact of the main relay 10 are in a sticking state, that is, the voltage provided by the vehicle power supply 30 The voltage signal is transmitted to the first relay low-side driving terminal D2 of the vehicle controller 40 through the movable contact and the static contact of the main relay 10 and the coil 21 of the first relay 20, so that the movable contact and the static contact of the first relay 20 The contacts are turned on, so that the voltage signal provided by the vehicle power supply 30 is transmitted to the signal acquisition terminal C2 of the vehicle controller 40 through the first relay 20; and if the obtained second voltage signal is not within the second preset range, the second A relay 20 has no sticking failure between the moving contact and the static contact. Exemplarily, the second preset range may be the same as the first preset range, that is, a range greater than 2V. Similarly, the detection of the second voltage signal can be realized through the digital signal acquisition module in the vehicle controller 40. The detection principle is the same as the principle of determining whether there is a sticking fault between the movable contact and the static contact of the first relay 10 according to the first voltage signal. , which will not be repeated here.

Optionally, FIG. 4 is a flowchart of another fault detection method for a vehicle relay set provided in an embodiment of the present application. As shown in FIG. 4 , the fault detection method for a vehicle relay set includes:

S310. When the low-side driving signal is not provided to the coil of the main relay and the low-side driving signal is not provided to the coil of the first relay, acquire a first voltage signal at the static contact of the first relay.

S320. According to the first voltage signal, determine a sticking fault between the movable contact and the static contact of the first relay.

S330. If the movable contact and the static contact of the first relay are in a non-adhesive state, when the low-side driving signal is provided to the coil of the first relay and the low-side driving signal is not provided to the coil of the main relay, obtain the first Second voltage signal at the static contact of the relay.

S340. According to the second voltage signal, determine a sticking fault between the movable contact and the static contact of the main relay.

S350. If neither the main relay nor the first relay is in the sticking state, when the low-side drive signal is provided to the coil of the main relay and the low-side drive signal is provided to the coil of the first relay, obtain the static contact of the first relay The third voltage signal at .

S360. According to the third voltage signal, determine the pull-in fault of the static contact and the movable contact of the main relay and the pull-in fault of the static contact and the movable contact of the first relay.

Exemplarily, after it is determined that neither the main relay 10 nor the first relay 20 has a sticking fault, it may be detected whether the main relay 10 and the first relay 20 have a fault that the movable contact and the static contact cannot be normally engaged. Provide the low-side driving signal to the coil 11 of the main relay 10, and provide the low-side driving signal to the coil of the first relay 20. At this time, if the moving contacts and static contacts of the main relay 10 and the first relay 20 can be normal Pulling in, the movable contact and the static contact of the main relay 10 are turned on, so that the movable contact and the static contact of the first relay 20 are turned on, and the voltage signal provided by the vehicle power supply 30 can be turned on through the first relay 20 The moving contact and the static contact of the vehicle controller 40 are transmitted to the signal acquisition terminal C2 of the vehicle controller 40; As a result, the movable contact and the static contact of the first relay 20 are disconnected, and the voltage signal provided by the vehicle power supply 30 cannot be transmitted to the signal collection terminal C2 of the vehicle controller 40 . Therefore, the third voltage signal at the static contact of the first relay 20 is acquired through the signal acquisition terminal C2 of the vehicle controller 40, and according to the third voltage signal, the relationship between the movable contact of the main relay 10 or the first relay 20 can be determined. Whether there is a fault that the static contact cannot be closed normally.

Exemplarily, the vehicle controller 40 can also be electrically connected to the indicator light, and the indicator light can be set in a one-to-one correspondence with the main relay 10 and at least one first relay 20. If it is determined that the moving contact and the static contact of the first relay 20 exist If there is a sticking fault or a pull-in fault, the vehicle controller 40 can output a prompt signal to the corresponding indicator light; or if it is determined that there is a sticking fault or a pull-in fault between the movable contact and the static contact of the main relay 10, the vehicle controller 40 can output a prompt signal To the corresponding indicator lights, different faults can correspond to different light colors of the indicator lights, so as to remind the user of the type of fault that occurs in the main relay 10 or the first relay 20 .

In the fault detection method of the vehicle relay group provided in the embodiment of the present application, after determining that there is no adhesion fault between the movable contact and the static contact of the main relay and the first relay, a low-side driving signal is provided to the coil of the main relay, and the The coil of a relay provides a low-side driving signal, and obtains the third voltage signal at the static contact of the first relay at this time, so as to determine the static contact and the movable contact of the main relay and the first voltage signal according to the third voltage signal. The pull-in fault of the static contact and the moving contact of the relay can realize the fast detection of the pull-in fault of the static contact and the moving contact of the main relay and the pull-in fault of the static contact and the moving contact of the first relay , simple and effective, easy to implement, and the fault detection method can be executed by the vehicle controller, reducing software and hardware costs.

Optionally, FIG. 5 is a flowchart of another fault detection method for a vehicle relay set provided in an embodiment of the present application. As shown in FIG. 5 , the fault detection method for a vehicle relay set includes:

S410. When the low-side driving signal is not provided to the coil of the main relay and the low-side driving signal is not provided to the coil of the first relay, acquire a first voltage signal at the static contact of the first relay.

S420. According to the first voltage signal, determine a sticking fault between the movable contact and the static contact of the first relay.

S430. If the movable contact and the static contact of the first relay are in a non-adhesive state, when the low-side drive signal is provided to the coil of the first relay and the low-side drive signal is not provided to the main relay, obtain the first relay The second voltage signal at the static contact.

S440. Determine, according to the second voltage signal, a sticking fault between the movable contact and the static contact of the main relay.

S450. If both the main relay and the first relay are not in the sticking state, when the low-side drive signal is provided to the coil of the main relay and the low-side drive signal is provided to the coil of the first relay, obtain the static contact of the first relay The third voltage signal at .

S460. Determine whether the third voltage signal is within the third preset range; if the third voltage signal is within the third preset range, execute S470; if the third voltage signal is not within the third preset range, execute S480.

S470. Determine that the static contact and the movable contact of the main relay are in a normal pull-in state and that the static contact and the moveable contact of the first relay are in a normal pull-in state.

Exemplarily, if both the movable contact and the static contact of the main relay 10 and the first relay 20 can be closed normally, the signal collecting terminal C2 of the vehicle controller 40 can collect the third voltage signal provided by the vehicle power supply 30 , and if the movable contact and static contact of any one of the main relay 10 and the first relay 20 cannot be normally engaged, the voltage signal provided by the vehicle power supply 30 cannot be transmitted to the signal acquisition terminal C2 of the vehicle controller 40, so , when the low-side driving signal is provided to the coil 11 of the main relay 10, and the low-side driving signal is provided to the coil of the first relay 20, the vehicle controller 40 obtains the third voltage signal through the signal acquisition terminal C2, if the third voltage signal Within the third preset range, it can be determined that the movable contact and the static contact of the main relay 10 and the movable contact and the static contact of the first relay 20 are in a normal pull-in state. Exemplarily, the third preset range may be the same as the first preset range, that is, the third preset range may be a range greater than 2V. The detection of the third voltage signal can also be realized by the digital signal acquisition module in the vehicle controller 40. The detection principle is the same as the principle of determining whether there is an adhesion fault between the movable contact and the static contact of the first relay 20 according to the first voltage signal. , which will not be repeated here.

S480. When the low-side drive signal is provided to the coil of the main relay and the low-side drive signal is not provided to the coil of the first relay, obtain the path voltage of the path between the moving contact and the static contact of the main relay and the coil of the first relay Signal.

S490. According to the channel voltage signal, determine the pull-in fault of the movable contact and the static contact of the main relay.

Exemplarily, if the third voltage signal is not within the third preset range, it can be determined that the movable contact and the static contact of the main relay 10 cannot be normally engaged, or the movable contact and the static contact of the first relay 20 cannot be closed. Normal pull-in, in order to determine whether the pull-in fault occurs between the movable contact and the static contact of the main relay 10, or the pull-in fault occurs between the movable contact and the static contact of the first relay 20, the movable contact of the main relay 10 can be detected Whether there is an open circuit fault in the circuit formed by the static contact and the coil 21 of the first relay 20, if there is an open circuit fault in this circuit, then it can be determined that the movable contact and the static contact of the main relay 10 cannot be normally attracted. If there is no open-circuit fault in the circuit, it can be determined that the movable contact and the static contact of the first relay 20 cannot be normally engaged.

Exemplarily, when the third voltage signal is not within the third preset range, it can be judged whether the channel voltage signal is within the preset range of the channel voltage; if the channel voltage signal is within the preset range of the channel voltage, it is determined whether The movable contact and the static contact are in the normal pull-in state, and the movable contact and the static contact of the first relay 20 are in the pull-in abnormal state; The contact and the static contact are in an abnormal state of suction. Wherein, the preset range of the channel voltage may be greater than 2V.

In the embodiment of the present application, an open-circuit fault can be detected by a detection circuit including a voltage comparator, and the input end of the detection circuit is electrically connected to the static contact of the main relay 10, wherein the input end of the detection circuit can be the non-inverting contact of the voltage comparator. The input terminal or the inverting input terminal provides a low-side drive signal to the coil of the main relay during detection, but does not provide a low-side drive signal to the coil of the first relay 20, if the movable contact and the static contact of the main relay 10 If it can be closed normally, the input terminal of the detection circuit receives the voltage signal provided by the vehicle power supply 30. If the movable contact and the static contact of the main relay 10 cannot be normally closed, the input terminal of the detection circuit has no voltage signal input. The detection circuit will output different level signals according to different voltage signals at the input terminals of the detection circuit, and the vehicle controller 40 can judge whether the movable contact and the static contact of the main relay 10 are Able to absorb normally.

Based on the same application concept, the embodiment of the present application also provides a fault detection device for a vehicle relay group, which can detect the body failure of each relay in the vehicle relay group, and the fault detection device for the vehicle relay group The device can be configured to execute the fault detection method of the vehicle relay group provided in the embodiment of the present application, the fault detection device of the vehicle relay group can be implemented by software and/or hardware, and the fault detection device of the vehicle relay group can be integrated in the vehicle controller .

Optionally, with reference to Fig. 1, the vehicle relay set 1 includes a main relay 10 and at least one first relay 20 (only 2 first relays are shown in the figure, but not limited thereto); the coil 11 of the main relay 10 is connected in series Between the vehicle power supply 30 and the main relay low-side drive terminal D1 of the vehicle controller 40; the movable contact of the main relay 10 is electrically connected to the vehicle power supply 30, and the coil 21 of the first relay 20 is connected in series with the static contact of the main relay 10 and Between the first relay low-side drive terminals of the vehicle controller 40 (different first relays correspond to different low-side drive terminals D2, D3); the movable contact of the first relay 20 is electrically connected to the vehicle power supply 30, and the first relay The static contact of 20 is electrically connected to the signal collection terminal of the vehicle controller 40 (different first relays correspond to different signal collection terminals C2, C3).

Optionally, FIG. 6 is a schematic structural diagram of a fault detection device for a vehicle relay set provided in an embodiment of the present application. As shown in FIG. 6, the fault detection device for a vehicle relay set includes a first voltage signal acquisition module 100, which is set In order to obtain the first voltage signal at the static contact of the first relay when the low-side drive signal is not provided to the coil of the main relay and the low-side drive signal is not provided to the coil of the first relay; the first fault detection module 200 , set to determine the sticking fault between the moving contact and the static contact of the first relay according to the first voltage signal; the second voltage signal acquisition module 300 is set to when the moving contact and the static contact of the first relay are in non-sticking state, when the low-side drive signal is provided to the coil of the first relay, and the low-side drive signal is not provided to the main relay, the second voltage signal at the static contact of the first relay is obtained; the second fault detection module 400 , is set to determine the adhesion fault between the movable contact and the static contact of the main relay according to the second voltage signal.

The fault detection device of the vehicle relay group provided by the embodiment of the present application obtains the first voltage signal at the static contact of the first relay through the first voltage signal acquisition module when neither the coil of the main relay nor the first relay receives the low-side driving signal. Voltage signal, through the first fault detection module according to the first voltage signal, determine the adhesion fault between the movable contact and the static contact of the first relay, when it is determined that there is no adhesion fault between the movable contact and the static contact of the first relay, send to The coil of the first relay provides a low-side drive signal, and obtains the second voltage signal at the static contact of the first relay through the second voltage signal acquisition module at this time, and determines the main relay through the second fault detection module according to the second voltage signal The sticking fault of the moving contact and the static contact realizes the fast detection of the sticking fault of the main relay and the first relay, which is simple, effective and easy to implement, and the fault detection method can be executed by the vehicle controller, reducing the cost of software and hardware .

Optionally, the first fault detection module further includes a first judging unit and a first fault determining unit, the first judging unit is configured to judge whether the first voltage signal is within a first preset range; the first fault determining unit is configured to When the first judging unit determines that the first voltage signal is within the first preset range, it determines that the movable contact and the static contact of the first relay are in an adhesion state, or the first judging unit determines that the first voltage signal is not within the first preset range. When within the range, it is determined that the moving contact and the static contact of the first relay are in a non-sticking state.

Optionally, the second fault detection module further includes a second judging unit and a second fault determining unit, the second judging unit is configured to judge whether the second voltage signal is within a second preset range; the second fault determining unit is configured to When the second judging unit determines that the second voltage signal is within the second preset range, it determines that the movable contact and the static contact of the main relay are in an adhesion state, or when the second judging unit determines that the second voltage signal is not within the second preset range When inside, make sure that the moving contact and static contact of the main relay are in a non-adhesive state.

Optionally, FIG. 7 is a schematic structural diagram of another fault detection device for a vehicle relay set provided in an embodiment of the present application. As shown in FIG. 7 , the fault detection device for a vehicle relay set further includes a third voltage signal acquisition module 500 , it is set to obtain the static contact of the first relay when the main relay and the first relay are not in the bonding state, when the low-side driving signal is provided to the coil of the main relay and the low-side driving signal is provided to the first relay The third voltage signal at; the third fault detection module 600 is configured to determine the pull-in fault of the static contact and the movable contact of the main relay and the static contact and the movable contact of the first relay according to the third voltage signal.

Optionally, the third fault detection module further includes a third judging unit and a third fault determining unit, the third judging unit is configured to judge whether the third voltage signal is within a third preset range; the third fault determining unit is configured to When the third judging unit determines that the third voltage signal is within the third preset range, it determines that both the static contact and the movable contact of the main relay and the static contact and the movable contact of the first relay are in a normal pull-in state.

Optionally, the third fault determination unit further includes a channel voltage signal acquisition unit and a pull-in fault determination unit, and the channel voltage signal acquisition unit is configured to determine that the third voltage signal is not within the third preset range when the third judging unit determines that When the low-side driving signal is provided to the coil of the main relay and the low-side driving signal is not provided to the coil of the first relay, the path voltage signal of the path between the moving contact and the static contact of the main relay and the coil of the first relay is obtained The pull-in fault determining unit is set to determine the pull-in fault of the moving contact and the static contact of the main relay according to the channel voltage signal.

Optionally, the pull-in fault determination unit includes a judgment subunit and a pull-in fault determination subunit, the judgment subunit is set to judge whether the channel voltage signal is within the preset range of the channel voltage, and the pull-in fault determination subunit is set to be within the judgment subunit When the unit determines that the channel voltage signal is within the preset range of the channel voltage, it determines that the movable contact and the static contact of the main relay are in the normal pull-in state, and the movable contact and the static contact of the first relay are in the abnormal pull-in state, or in When the judging sub-unit determines that the channel voltage signal is not within the preset range of the channel voltage, it determines that the movable contact and the static contact of the main relay are in an abnormal pull-in state.

Based on the same application idea, the embodiment of the present application also provides a vehicle control system, including: a vehicle controller and a vehicle relay group; referring to FIG. 1 , the vehicle relay group 1 includes a main relay 10 and at least one first relay 20 (only 2 first relays are shown, but not limited thereto); the coil 11 of the main relay 10 is connected in series between the vehicle power supply 30 and the main relay low side drive terminal D1 of the vehicle controller 40; the movable contact of the main relay 10 and The vehicle power supply 30 is electrically connected, and the coil 21 of the first relay 20 is connected in series with the static contact of the main relay 10 and the first relay low-side driving end of the vehicle controller 40 (different first relays correspond to different low-side driving ends D2, Between D3); the movable contact of the first relay 20 is electrically connected with the vehicle power supply 30, and the static contact of the first relay 20 is connected with the signal acquisition terminal of the vehicle controller 40 (different first relays correspond to different signal acquisition terminals C2 , C3) electrical connection. The vehicle controller 40 is configured to execute the fault detection method for a vehicle relay set provided by any embodiment of the present application. Wherein, the vehicle relay set failure detection device provided by any embodiment of the present application can be integrated into the vehicle controller 40 .

Claims

A fault detection method for a vehicle relay group, which is executed by a vehicle controller, the vehicle relay group (1) includes a main relay (10) and at least one first relay (20); the coil of the main relay (10) ( 11) Connected in series between the vehicle power supply (30) and the main relay low-side drive terminal (D1) of the vehicle controller (40); the moving contact of the main relay (10) is connected to the vehicle power supply (30) Electrically connected, the coil (21) of each first relay (20) is connected in series with the static contact of the main relay (10) and the first relay low-side drive terminal (D2; D3) of the vehicle controller (40). ); the moving contact of each of the first relays (20) is electrically connected to the vehicle power supply (30), and the static contact of each of the first relays (20) is connected to the vehicle controller ( 40) is electrically connected to the signal acquisition terminal (C2; C3), wherein, for any first relay in the at least one relay, the fault detection method of the vehicle relay group (1) includes:

In response to not providing a low-side drive signal to the coil (11) of the main relay (10) and not providing a low-side drive signal to the coil (21) of the first relay (20), acquiring (S110) the a first voltage signal at the static contact of the first relay (20);

According to the first voltage signal, determining (S120) a sticking fault between the movable contact and the static contact of the first relay (20);

Responding to the fact that the movable contact and the static contact of the first relay (20) are in a non-adhesion state, a low-side drive signal is provided to the coil (21) of the first relay (20), and the main When the coil (11) of the relay (10) provides a low-side drive signal, acquiring (S130) a second voltage signal at the static contact of the first relay (20);

According to the second voltage signal, determine (S140) a sticking fault between the movable contact and the static contact of the main relay (10).
The fault detection method for a vehicle relay group according to claim 1, wherein, according to the first voltage signal, determining (S120) a sticking fault between the movable contact and the static contact of the first relay includes:

judging (220) whether the first voltage signal is within a first preset range;

In response to the first voltage signal being within the first preset range, determining (S230) that the movable contact and the static contact of the first relay (20) are in a sticking state;

In response to the first voltage signal not being within the first preset range, it is determined (S240) that the movable contact and the static contact of the first relay (20) are in a non-sticking state.
The fault detection method for a vehicle relay group according to claim 1, wherein, according to the second voltage signal, determining (S140) a sticking fault between a movable contact and a static contact of the main relay (10) includes:

judging (S260) whether the second voltage signal is within a second preset range;

In response to the second voltage signal being within the second preset range, determining (S270) that the movable contact and the static contact of the main relay (10) are in a sticking state;

In response to the second voltage signal not being within the second preset range, it is determined (S280) that the movable contact and the static contact of the main relay (10) are in a non-sticking state.
The fault detection method of the vehicle relay group according to claim 1, further comprising:

In response to neither the main relay (10) nor the first relay (20) being in a stuck state, a low-side drive signal is provided to the coil (11) of the main relay (10), and a low-side driving signal is provided to the first relay (20) When the coil (21) of the relay (20) provides a low-side drive signal, acquiring (S350) a third voltage signal at the static contact of the first relay (20);

According to the third voltage signal, determine (S360) the pull-in fault of the static contact and the movable contact of the main relay (10) and the pull-in fault of the static contact and the movable contact of the first relay (20) failure.
The fault detection method for a vehicle relay group according to claim 4, wherein, according to the third voltage signal, determine (S360) the pull-in fault of the static contact and the movable contact of the main relay (10) and the Describe the pull-in failure of the static contact and the moving contact of the first relay (20), including:

judging (S460) whether the third voltage signal is within a third preset range;

In response to the third voltage signal being within the third preset range, it is determined (S470) that the static contact and the movable contact of the main relay (10) are in a normal pull-in state and the first relay (20 ) The static contact and the moving contact are in the normal pull-in state.
The fault detection method of the vehicle relay group according to claim 5, further comprising:

In response to the third voltage signal not being within the third preset range, providing a low-side driving signal to the coil (11) of the main relay (10) and not supplying the coil (11) to the first relay When the low-side drive signal is used, obtain (S480) a path voltage signal that forms a path between the movable contact and the static contact of the main relay (10) and the coil (21) of each first relay (20);

According to the channel voltage signal, determine (S490) the pull-in failure of the movable contact and the static contact of the main relay (10).
The fault detection method of the vehicle relay group according to claim 6, wherein, according to the channel voltage signal, determining (S490) the pull-in fault of the movable contact and the static contact of the main relay (10) includes:

judging whether the channel voltage signal is within a preset range of the channel voltage;

In response to the channel voltage signal being within the preset range of the channel voltage, it is determined that the movable contact and the static contact of the main relay (10) are in a normal pull-in state, and the movable contact of the first relay (20) and the The static contact is in an abnormal state of pull-in;

In response to the channel voltage signal not being within the preset range of the channel voltage, it is determined that the movable contact and the static contact of the main relay (10) are in an abnormal state of pull-in.
A fault detection device for a vehicle relay group, the vehicle relay group (1) includes a main relay (10) and at least one first relay (20); the coil (11) of the main relay (10) is connected in series to a vehicle power supply (30) and the main relay low-side drive terminal (D1) of the vehicle controller (40); the moving contact of the main relay (10) is electrically connected to the vehicle power supply (30), and each first A coil (21) of a relay (20) is connected in series between the static contact of the main relay (10) and the first relay low-side drive terminal (D2; D3) of the vehicle controller (40); the The movable contact of each first relay (20) is electrically connected with the vehicle power supply (30), and the static contact of each first relay (20) is connected with the signal collection terminal of the vehicle controller (40). (C2; C3) Electrically connected, for any first relay in the at least one relay, the fault detection device of the vehicle relay group includes:

The first voltage signal acquisition module (100), configured to respond to the low-side drive signal not being provided to the coil (11) of the main relay (10) and not being supplied to the coil (21) of the first relay (20) providing a low-side drive signal to obtain a first voltage signal at the static contact of the first relay (20);

A first fault detection module (200), configured to determine a sticking fault between the movable contact and the static contact of the first relay (20) according to the first voltage signal;

The second voltage signal acquisition module (300) is configured to respond to the non-adhesive state of the movable contact and the static contact of the first relay (20), and provide the coil ( 21) When a low-side drive signal is provided and the low-side drive signal is not provided to the coil (11) of the main relay (10), obtain a second voltage signal at the static contact of the first relay (20);

The second fault detection module (400) is configured to determine the sticking fault between the movable contact and the static contact of the main relay (10) according to the second voltage signal.
The fault detection device of the vehicle relay group according to claim 8, further comprising:

The third voltage signal acquisition module (500) is configured to supply the coil (11) of the main relay (10) when neither the main relay (10) nor the first relay (20) is in a sticking state providing a low-side driving signal, and obtaining a third voltage signal at the static contact of the first relay (20) when the low-side driving signal is provided to the first relay (20);

The third fault detection module (600) is configured to determine the static contact and the movable contact of the main relay (10) and the static contact and the movable contact of the first relay (20) according to the third voltage signal Contact failure.
A vehicle control system, comprising: a vehicle controller (40) and a vehicle relay group (1);

The vehicle relay group (1) includes a main relay (10) and at least one first relay (20); the coil (11) of the main relay (10) is connected in series with the vehicle power supply (30) and the vehicle controller ( 40) between the low-side driving terminals (D1) of the main relay; the movable contact of the main relay (10) is electrically connected to the vehicle power supply (30), and the coil (21) of each first relay (20) connected in series between the static contact of the main relay (10) and the first relay low-side drive terminal (D2; D3) of the vehicle controller (40); the dynamic contact of each first relay (20) The contacts are electrically connected to the vehicle power supply (30), and the static contacts of each of the first relays (20) are electrically connected to the signal collection terminals (C2; C3) of the vehicle controller (40);

The vehicle controller (40) is configured to execute the fault detection method for a vehicle relay set according to any one of claims 1-7.