Vehicle lamp fault feedback system and method and vehicle

Abstract

The invention provides a fault feedback system of a vehicle lamp. The fault feedback system comprises a vehicle lamp driving module, a control module and a false load module, the vehicle lamp driving module is used for driving one or more LEDs to be lightened and detecting the port voltage and current of each LED at the same time, and when any LED breaks down, the vehicle lamp driving module is used for sending a fault signal to the control module; the control module is connected with the false load module and is used for outputting a low-level signal to the false load module according to the fault signal; the dummy load module comprises a first port and a second port, the dummy load module is connected with the control module through the first port, the first port receives a low level signal, and the first port is adjusted to be in a low level state; the second port is used for outputting dummy load current, and when the first port is in a low-level state, the output current of the second port is lower than a first current threshold value. According to the invention, the vehicle lamp system fault feedback is more timely and accurate, and the vehicle body can receive the vehicle lamp fault prompt conditionally.

Description

Technical Field

[0001] The present invention relates to the field of vehicle lamp fault diagnosis systems, and in particular to a lamp fault feedback system, a lamp fault feedback method and a vehicle. Background Art

[0002] In the prior art, the fault feedback monitoring of automobile lights is usually implemented by the short-circuit and open-circuit detection mechanism of the light ECU output channel. In order to fully utilize the output capacity of the ECU, when all the official power supply channels are occupied, the ECU's high-side HSS will be considered as the power supply and control signal of the light module. Based on this application, the fault monitoring feedback of the LED becomes a problem.

[0003] Therefore, a vehicle light fault diagnosis method that can cooperate with the ECU high-side HSS is needed. Summary of the invention

[0004] In order to overcome the above-mentioned technical defects, the purpose of the present invention is to provide a fault feedback system and method for vehicle lights, so as to perform LED fault monitoring feedback when using the high-side HSS of the ECU as the power supply and control signal of the lamp group module, so that the system fault feedback is more timely and accurate, and the vehicle body can conditionally receive headlight fault reminders, while also facilitating technical cross-iteration between truck models of various vehicle manufacturers.

[0005] Specifically, the present invention discloses a vehicle lamp fault feedback system, which is connected to an electronic control unit and includes a vehicle lamp drive module, a control module and a dummy load module;

[0006] The car light driving module is used to drive one or more LEDs to light up, and detect the port voltage and current of each LED at the same time. When any of the LEDs fails, the car light driving module is used to send a fault signal to the control module;

[0007] The control module is connected to the dummy load module, and according to the fault signal, the control module is used to output a low level signal to the dummy load module;

[0008] The dummy load module includes a first port and a second port, the dummy load module is connected to the control module via the first port, the first port receives the low level signal, and adjusts the first port to a low level state;

[0009] The second port is used to output a dummy load current, and when the first port is in a low level state, the output current of the second port is lower than a first current threshold;

[0010] The vehicle lamp fault feedback system is connected to the electronic control unit via the second port, and the first current threshold is the minimum operating current output by the electronic control unit to the second port when the LED is working normally.

[0011] Preferably, the electronic control unit is used to determine whether the LED is faulty based on the output current of the second port; when the output current of the second port is lower than the first current threshold, the electronic control unit is used to determine that the vehicle light is faulty.

[0012] Preferably, the dummy load module includes transistors Q1, Q2, Q3 and resistors R1, R2, R3, R4, R5 and R6; the emitter of the transistor Q1 is grounded, the first port is connected to the base of the transistor Q1 through R1, and the power supply voltage VCC is connected to the collector of the transistor Q1 through R2;

[0013] The base of the transistor Q2 is connected to the collector of Q1, the emitter of the transistor Q2 is grounded through R3, and the collector of Q2 is connected to the second port through R4;

[0014] The collector of the transistor Q3 is connected to the second port, the emitter of the transistor Q3 is grounded through R5, and the power supply voltage VCC is connected to the base of the transistor Q3 through R6.

[0015] Preferably, the first port is in a low level state, the transistors Q1 and Q2 are turned off, the transistor Q3 is continuously turned on, and the output current of the second port is lower than the first current threshold.

[0016] Preferably, the headlight driving module sends a fault signal to the control unit via the vehicle-mounted CAN.

[0017] Preferably, the headlight fault feedback system as described in claim 1 is characterized in that the headlight driving module also includes an input control module, the input control module is connected to the control module, and the input control module is connected to a dummy load module; the electronic control unit is used to input the minimum operating current to the input control module, and the input control module outputs a headlight control signal to the control module; when the LED fails, the low level state of the first port is input to the dummy load module via the input control module.

[0018] Another aspect of the present invention provides a vehicle light fault feedback method applied to any of the above vehicle light fault feedback systems.

[0019] Preferably, the method comprises: the vehicle light driving module continuously detects the working state of the LED, and when any of the LEDs fails, the vehicle light driving module sends a fault signal to the control module;

[0020] The control module is connected to the dummy load module via a first port. When the LED is not faulty, the first port is in a high level state. According to the fault signal, the control module adjusts the first port to a low level state.

[0021] When the first port is in a low level state, the output current of the second port of the dummy load module is lower than a first current threshold; the electronic control unit is based on the feedback fault, and the first current threshold is the minimum operating current of the electronic control unit.

[0022] Another aspect of the present invention provides a vehicle, comprising a fault feedback system for a vehicle lamp as described above.

[0023] Compared with the prior art, the above technical solution has the following beneficial effects:

[0024] 1. The present invention uses an MCU control module to receive the error signal of the LED headlight drive module and controls the disconnection of the dummy load module, thereby feeding back the short circuit or open circuit error of a single LED to the output end (i.e., the second port) of the electronic control unit ECU, thereby realizing conditional reception of headlight fault reminder by the vehicle body.

[0025] 2. The present invention uses a dummy load module as a detection circuit, avoiding the shortcomings and complexity of the short-circuit and open-circuit detection mechanism of the ECU output channel. At the same time, the present invention uses a dummy load module to process the control signal input by the ECU and the dummy load to feedback the headlight fault information to the ECU, making the system fault feedback more timely and accurate.

[0026] 3. The present invention can directly power the LED circuit with a power control signal (HSS) for different types of LED headlight driver modules, which not only saves system overhead, but also facilitates technical cross-iteration between truck models of various vehicle manufacturers. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a block diagram of a vehicle light fault feedback system in a preferred embodiment of the present invention.

[0028] Figure 2 It is a diagram of the working principle of a dummy load in a preferred embodiment of the present invention.

[0029] Reference numerals:

[0030] Headlight driver module-10, LED-11;

[0031] Control module-20;

[0032] Dummy load module-30, first port-31, second port-32;

[0033] DC / DC Converter - 40. DETAILED DESCRIPTION

[0034] The advantages of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments.

[0035] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0036] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0037] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0038] In the following description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present invention, and have no specific meanings. Therefore, "module" and "component" can be used interchangeably.

[0039] like Figure 1As shown, it is a block diagram of a vehicle light fault feedback system in accordance with a preferred embodiment of the present invention. In this embodiment, the vehicle light is a plurality of LED lamp beads, and the control module 20 is an MCU. In this embodiment, the vehicle light fault feedback system is connected to an ECU (Electronic Control Unit, not shown in the figure), and the ECU outputs a PWM high-side switch signal (PWM HSS3), a ground signal (GND) and a power supply control signal (Power Supply HSS1) to the LED fault diagnosis feedback system. As shown in the figure, the vehicle light fault feedback system in this preferred embodiment includes a vehicle light drive module 10, a control module 20, an input control module (PWM input) and a dummy load module 30, and the electronic control unit ECU (not shown in the figure) is connected to the vehicle light fault feedback system in this embodiment through a second port 32. This embodiment also includes components such as a power protection circuit, a CAN transceiver, and a converter. Specifically:

[0040] ——Car light driver module 10

[0041] The headlight driving module 10 is used to drive the LED 11 to light up, and detect the port voltage and current of each LED at the same time. When the port voltage and current of the LED 11 are abnormal, that is, the port voltage and current exceed the limit, the headlight driving module 10 generates an error signal and sends the fault error signal to the control module 20 (that is, the MCU in the figure) in the CAN communication loop.

[0042] ——Control module 20

[0043] After the control module 20 receives the error signal sent by the headlight driving module 10 through the CAN transceiver shown in the figure and confirms that a fault has occurred in LED 11, the control module 20 generates a PWM diagnostic signal, i.e., a low-level signal, according to the error signal, and sends the low-level signal to the dummy load module 30 through the first port 31, and controls the shutdown of the dummy load module 30.

[0044] ——Input control module (PWM input)

[0045] The input control module is connected to the control module 20, and the input control module is connected to the dummy load module 30, that is, the input control module is connected between the control module 20 and the dummy load module 30. When the LED is working normally, the ECU inputs a PWM high-side switch signal (PWM HSS3) to the input control module, and the input control module outputs a headlight control signal to the control module 20. The control module 20 generates a PWM diagnostic signal (PWM DIAG), which is sent to the dummy load module 30 via the input control module, and controls the dummy load module 30 to be turned off, and the current I3 of the PWM high-side switch signal (PWM HSS3) connected to the dummy load module 30 drops below the normal working threshold current.

[0046] ——Dummy load module 30

[0047] The control module 20 is connected to the dummy load module 30 through the first port 31. The dummy load module 30 receives the low level signal sent by the control module 20. At this time, the first port 31 is in a low level state, and the output current at the corresponding second port 32 is reduced. Since the second port 32 is a PWM high-side switch, when the current of the second port 32 drops below the first current threshold, the ECU can confirm that the LED is faulty.

[0048] The dummy load module 30 receives the PWM diagnostic signal (PWM DIAG) sent by the control module 20. Under normal working conditions, the dummy load module 30 continuously receives the load current extracted from the PWM high-side switch signal (PWM HSS3) to ensure that the current power of the PWM high-side switch signal (PWM HSS3) is within the normal working threshold range of the port set by the ECU. Under abnormal working conditions, after receiving the diagnostic signal sent by the control module 20, the dummy load module 30 reduces the current I3 output by the PWM high-side switch signal (PWM HSS3).

[0049] Correspondingly, when the LED 11 operates normally, the first port 31 is in a high level state. At this time, the dummy load module 30 is continuously turned on to extract load current from the second port 32 to ensure that the current of the second port 32 is within the normal operating threshold range of the port set by the ECU.

[0050] It can be seen that in this embodiment, the ECU can directly determine whether the LED is faulty by the current value at the second port 32 (i.e., PWM HSS3). If the ECU identifies that the current at the second port 32 is abnormal, it can make the next decision according to the agreed fault handling plan or directly report the fault result to the vehicle body.

[0051] In addition, the vehicle lamp fault feedback system in this embodiment further includes a DC / DC converter 40 .

[0052] ——DC / DC converter 40

[0053] The DC / DC converter 40 supplies power to the LED circuit and outputs the voltage transmission signal required for the operation of the headlight driver module 10. In this embodiment, the DC / DC converter 40 adopts a Buck-Boost topology. In other embodiments, the DC / DC converter 40 may adopt other structures as long as it can supply power to the LED circuit and output the voltage transmission signal required for the operation of the headlight driver module 10. The DC / DC converter 40 may not be used, and the power supply control signal (i.e., the power supply HSS1 in the figure) may be used to directly supply power to the LED circuit based on different types of headlight driver modules 10.

[0054] In another preferred embodiment, the control module 20 communicates with the vehicle light driving module 10 via CAN to detect the short circuit or open circuit of each LED 11 and provide feedback.

[0055] like Figure 2 As shown, it is a circuit diagram of a dummy load module in accordance with a preferred embodiment of the present invention. The dummy load module in this preferred embodiment includes transistors Q1, Q2, Q3 and resistors R1, R2, R3, R4, R5 and R6; the emitter of the transistor Q1 is grounded, the first port is connected to the base of the transistor Q1 through R1, and the power supply voltage VCC is connected to the collector of the transistor Q1 through R2; the base of the transistor Q2 is connected to the collector of Q1, the emitter of the transistor Q2 is grounded through R3, and the collector of Q2 is connected to the second port through R4; the collector of the transistor Q3 is connected to the second port, the emitter of the transistor Q3 is grounded through R5, and the power supply voltage VCC is connected to the base of the transistor Q3 through R6. It should be noted that the resistance value in this embodiment is designed according to the ECU channel fault detection current threshold range. In another preferred embodiment, the resistor R1 can be omitted.

[0056] In this preferred embodiment, the threshold range of the normal working current of the second port 32 of the ECU is 46mA-1000mA. Therefore, when the output current value of the second port 32 is less than 46mA, the ECU issues a fault alarm. The operating principle of the dummy load module in this embodiment is:

[0057] When LED11 is operating normally and the headlight driving module 10 has no fault error signal, the fault diagnosis signal PWM diagnosis from the control module 20 is a default high-level signal. At this time, the transistor Q1 switch is turned on, and the transistor Q2 is turned on accordingly. The transistor Q3 of the second set of dummy loads is continuously in the on state. The Io1 of the first set of dummy loads and the Io2 of the second set of dummy loads together constitute the input current of the second port 32. At this time, the output current of the second port 32 is greater than 46mA, and the dummy load circuit operates normally.

[0058] When any LED has a short circuit or open circuit fault, the headlight driver module 10 will detect that the port voltage and current of LED11 are abnormal, and the headlight driver module 10 generates an error signal. Then, after the control module 20 recognizes the fault error signal reported by the headlight driver module 10 in the CAN communication loop, it adjusts the diagnostic signal PWM diagnosis to a low-level signal according to the error signal. At this time, the transistor Q1 switch is turned off, and the transistor Q2 is turned off accordingly. Only the transistor Q3 of the second group of dummy loads remains in the open state. The Io2 current of the second group of dummy loads is lower than 46mA. At this time, the ECU detects that the output current value of the second port 32 is less than 46mA, and the ECU recognizes the fault information.

[0059] Based on the above circuit structure, it can be seen that the working principle of the vehicle lamp fault feedback system in this embodiment is:

[0060] When working, the ECU's PWM high-side switch signal (i.e. Figure 1 The PWM HSS3 in the input control module and the dummy load circuit 30 input the headlight control signal, and the power supply control signal (power supply HSS1) is input as the DC / DC converter 40 after passing through the power supply protection circuit; the input control module controls the PWM high-side switch signal (PWM HSS3) and transmits it to the control module 20 after signal recognition and processing, and the control module 20 sends a control command to the headlight drive module 10 in a communication manner, and the headlight drive module 10 controls to turn on the corresponding LED 11. When the headlight drive module 10 detects that any LED 11 is abnormal, it will send an error message to the control module 20 in a communication manner; the control module 20 outputs a PWM diagnostic signal through the first port 31 to disconnect the dummy load module 30, so that the current of the PWM high-side switch signal (PWM HSS3) drops below the normal working threshold current, and the ECU recognizes that the current power of the PWM high-side switch signal (PWM HSS3) is abnormal, and determines that there is a fault in the LED fault diagnosis feedback system or reports it to the vehicle body.

[0061] In this embodiment, the plurality of LEDs 11 are respectively LEDs for daytime running lights, LEDs for position lights, LEDs for low beam lights, LEDs for high beam lights, etc. In other embodiments, the LEDs may be light sources for other functional vehicle lights, which are not specifically limited here.

[0062] Accordingly, in another embodiment of the present invention, a vehicle lamp fault feedback method is provided, comprising:

[0063] S1: The headlight driving module continuously detects the working status of the LEDs. When any of the LEDs fails, the headlight driving module sends a fault signal to the control module.

[0064] S2: the control module is connected to the dummy load module via the first port 31. When the LED is not faulty, the first port is in a high level state. According to the fault signal, the control module adjusts the first port 31 to a low level state.

[0065] S3: when the first port 31 is in a low level state, the current of the second port 32 of the dummy load module is lower than a first current threshold;

[0066] S4: According to the current of the second port being lower than the first current threshold, it is determined that the LED fails, and the ECU feedbacks the failure, wherein the first current threshold is the lowest value of the operating current of the ECU.

[0067] Another preferred embodiment provides a dummy load workflow in the LED headlight fault diagnosis feedback method, including the following steps:

[0068] S0: Determine the working status of LED11;

[0069] S11: When the LED operates normally, the diagnostic signal is a high level signal;

[0070] In this step, when the LED 11 operates normally and the headlight driving module 10 does not issue an error signal indicating a fault, the fault diagnosis signal PWM diagnosis from the control module 20 is a default high-level signal.

[0071] S12: When any LED has a short circuit or open circuit fault, an error signal is generated, and the diagnostic signal is adjusted to a low level signal according to the error signal;

[0072] In this step, when any LED has a short circuit or open circuit fault, the headlight driver module 10 will detect that the port voltage and current of the LED 11 are abnormal, and the headlight driver module 10 generates an error signal. Then, after the control module 20 recognizes the fault error signal reported by the headlight driver module 10 in the CAN communication loop, it adjusts the diagnostic signal PWM diagnosis to a low level signal according to the error signal.

[0073] S21: Transistor Q1 switch is turned on, and transistor Q2 is turned on;

[0074] In this step, the transistor Q1 is turned on, and the transistor Q2 is turned on accordingly. The transistor Q3 of the second set of dummy loads is continuously in the on state.

[0075] S22: Transistor Q1 switch is turned off, and transistor Q2 is turned off;

[0076] In this step, the transistor Q1 is turned off, and the transistor Q2 is turned off accordingly. Only the transistor Q3 of the second set of dummy loads is continuously turned on.

[0077] S31: The input current is normal and the dummy load circuit works normally;

[0078] In this step, Io1 of the first set of dummy loads and Io2 of the second set of dummy loads together constitute the output current of the second port 32. At this time, the input current of the second port 32 is not lower than the first current threshold, and the dummy load loop works normally.

[0079] S32: The input current is abnormal and the fault information is reported to the vehicle body.

[0080] In this step, the Io2 current of the second group of dummy loads is lower than the first current threshold. At this time, the ECU detects that the output current value of the second port 32 is less than the first current threshold, and the ECU recognizes the fault information, performs the fault processing preset by the automobile system or reports the fault information to the vehicle body. The first current threshold is the lowest current threshold when the ECU works normally. In this embodiment, the operating current range of the ECU is 46mA-1000mA, and the first current threshold is 46mA.

[0081] Another embodiment of the present invention is a vehicle that conforms to the present invention. The vehicle can realize all functions that existing vehicles can realize, including but not limited to driving and automatic driving. The vehicle is equipped with the headlight fault feedback system in the above embodiment, and its technical features are the same as the technical features of the above circuit, and the present invention will not be repeated here.

[0082] It should be noted that the embodiments of the present invention have better practicability and do not impose any form of limitation on the present invention. Any technician familiar with the field may use the technical content disclosed above to change or modify it into an equivalent effective embodiment. However, any modification or equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A vehicle lamp fault feedback system, the vehicle lamp fault feedback system is connected to an electronic control unit, characterized in that: Including a headlight drive module, a control module and a dummy load module; The car light driving module is used to drive one or more LEDs to light up, and detect the port voltage and current of each LED at the same time. When any of the LEDs fails, the car light driving module is used to send a fault signal to the control module; The control module is connected to the dummy load module, and according to the fault signal, the control module is used to output a low level signal to the dummy load module; The dummy load module includes a first port and a second port, the dummy load module is connected to the control module via the first port, the first port receives the low level signal, and adjusts the first port to a low level state; The second port is used to output a dummy load current, and when the first port is in a low level state, the output current of the second port is lower than a first current threshold; The vehicle lamp fault feedback system is connected to the electronic control unit via the second port, and the first current threshold is the minimum operating current output by the electronic control unit to the second port when the LED is working normally.

2. The vehicle lamp fault feedback system according to claim 1, characterized in that: The electronic control unit is used to determine whether the LED fails according to the output current of the second port; When the output current of the second port is lower than the first current threshold, the electronic control unit is configured to determine that a fault occurs in the vehicle lamp.

3. The vehicle lamp fault feedback system according to claim 2, characterized in that: The dummy load module includes transistor Q1, transistor Q2, transistor Q3 and resistors R1, R2, R3, R4, R5 and R6; The emitter of the transistor Q1 is grounded, the first port is connected to the base of the transistor Q1 through R1, and the power supply voltage VCC is connected to the collector of the transistor Q1 through R2; The base of the transistor Q2 is connected to the collector of Q1, the emitter of the transistor Q2 is grounded through R3, and the collector of Q2 is connected to the second port through R4; The collector of the transistor Q3 is connected to the second port, the emitter of the transistor Q3 is grounded through R5, and the power supply voltage VCC is connected to the base of the transistor Q3 through R6.

4. The vehicle lamp fault feedback system as claimed in claim 3, characterized in that: The first port is in a low level state, the transistors Q1 and Q2 are turned off, the transistor Q3 is continuously turned on, and the output current of the second port is lower than the first current threshold.

5. The vehicle lamp fault feedback system as claimed in claim 4, characterized in that: The vehicle light driving module sends a fault signal to the control unit via the vehicle-mounted CAN.

6. The vehicle lamp fault feedback system according to claim 1, characterized in that: The headlight driving module further comprises an input control module, the input control module is connected to the control module, and the input control module is connected to a dummy load module; the electronic control unit is used to input the minimum working current to the input control module, and the input control module outputs a headlight control signal to the control module; When the LED fails, the low level state of the first port is input to the dummy load module via the input control module.

7. A fault feedback method for a vehicle lamp applied to the fault feedback system for a vehicle lamp as claimed in any one of claims 1 to 6.

8. The vehicle lamp fault feedback method as claimed in claim 7, It is characterized in that The vehicle light driving module continuously detects the working state of the LED, and when any of the LEDs fails, the vehicle light driving module sends a fault signal to the control module; The control module is connected to the dummy load module via a first port. When the LED is not faulty, the first port is in a high level state. According to the fault signal, the control module adjusts the first port to a low level state. When the first port is in a low level state, the output current of the second port of the dummy load module is lower than a first current threshold; The electronic control unit is based on the feedback fault, and the first current threshold is the minimum operating current of the electronic control unit.

9. A vehicle, characterized in that: A fault feedback system for a vehicle lamp comprising any one of claims 1-5.

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