A system and method for indicating abnormal power supply in the low-voltage circuit of a vehicle.

Abstract

This invention discloses a system and method for indicating abnormal power supply in a vehicle's low-voltage circuit, belonging to the field of automotive technology. The method includes: the vehicle control unit (VCU) determining whether its communication with the DC / DC converter is normal; if not, the VCU controls the illumination of a DC / DC fault indicator light after a debounce period; if yes, the DC / DC converter feeds back its fault information and operating status information to the VCU; when the DC / DC converter feeds back a high-level fault or a fault status, the VCU controls the illumination of the DC / DC fault indicator light. This system and method for indicating abnormal power supply in a vehicle's low-voltage circuit can cover more scenarios and provide alerts for abnormal power supply in the vehicle's low-voltage circuit without adding components.

Description

Technical Field

[0001] This invention belongs to the field of automotive technology. Specifically, this invention relates to a system and method for indicating abnormal power supply in the low-voltage circuit of a vehicle. Background Technology

[0002] Currently, existing warning systems for low-voltage circuit malfunctions in vehicles typically involve the DC / DC converter reporting a fault status via bus messages and illuminating a DC / DC fault indicator light when malfunctioning. However, this method is not perfect. For example, it cannot provide a warning when bus communication is lost. If the vehicle continues to be driven, it may suddenly break down, posing a significant safety hazard.

[0003] Patent CN113765166A discloses a DC / DC circuit, a fault detection method, a device, and an automobile. The DC / DC circuit includes a DC / DC controller, which is connected to a low-voltage battery and a high-voltage battery pack. The DC / DC controller includes a current detection circuit for detecting the current at the low-voltage positive output port, a voltage detection circuit for detecting the voltage between the low-voltage positive output port and the low-voltage negative output port, and a control circuit connected to the current detection circuit and the voltage detection circuit.

[0004] However, the technology disclosed in the aforementioned patent cannot cover more scenarios of abnormal power supply in the low-voltage circuit of the whole vehicle and provide prompts without adding more parts. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a system and method for alerting abnormal power supply in the low-voltage circuit of a vehicle, in order to cover more scenarios of abnormal power supply in the low-voltage circuit of the vehicle and provide alerts without adding any parts.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] This invention provides a system for alerting abnormal power supply in the low-voltage circuit of a vehicle, including a vehicle controller (VCU), an instrument module, and a DC / DC converter. The vehicle controller (VCU) is connected to the instrument module, and the vehicle controller (VCU) is connected to the DC / DC converter.

[0008] Furthermore, the vehicle control unit (VCU) checks whether its communication with the DC / DC converter is normal.

[0009] Furthermore, if the vehicle control unit (VCU) detects an abnormality in its communication with the DC / DC converter, the VCU will control the instrument module to illuminate the DC / DC fault indicator light after the debounce time has elapsed.

[0010] Furthermore, when the vehicle control unit (VCU) detects that its communication with the DC / DC converter is normal, the DC / DC converter feeds back its own fault level information to the vehicle control unit (VCU); the DC / DC converter also feeds back its own operating status information to the vehicle control unit (VCU).

[0011] Furthermore, if the DC / DC converter feeds back a high-level fault to the vehicle control unit (VCU), the VCU control instrument module will illuminate the DC / DC fault indicator light.

[0012] Furthermore, when the DC / DC converter feeds back a fault status to the vehicle control unit (VCU), the VCU instrument module illuminates the DC / DC fault indicator.

[0013] Furthermore, if the DC / DC converter feeds back to the vehicle controller (VCU) without fault and the operating status of the vehicle controller (VCU) is normal, then the vehicle controller (VCU) will detect the voltage of the vehicle's low-voltage circuit.

[0014] Furthermore, if the vehicle control unit (VCU) detects that the voltage of the vehicle's low-voltage circuit is less than 12 volts and the duration of the voltage being less than 12 volts is greater than a preset time threshold, the VCU will control the instrument module to illuminate the DC / DC fault indicator.

[0015] Furthermore, the preset time threshold is 5 seconds.

[0016] The present invention also provides a method for indicating abnormal power supply in the low-voltage circuit of a vehicle, the method comprising the following steps:

[0017] S1: The vehicle control unit (VCU) determines whether its communication with the DC / DC converter is normal; if yes, proceed to S2; otherwise, proceed to S7.

[0018] S2: The DC / DC converter feeds back its own fault level information to the vehicle controller (VCU); the DC / DC converter feeds back its own operating status information to the vehicle controller (VCU);

[0019] S3: The vehicle control unit (VCU) judges the information fed back by the DC / DC converter; when the DC / DC converter feeds back a high-level fault to the vehicle control unit (VCU), it proceeds to S4; when the DC / DC converter feeds back a fault status to the vehicle control unit (VCU), it proceeds to S4; when the DC / DC converter feeds back a fault-free status to the vehicle control unit (VCU) and the vehicle control unit (VCU) reports a normal status, it proceeds to S5.

[0020] S4: The vehicle control unit (VCU) instrument module illuminates the DC / DC fault indicator light; proceed to S8;

[0021] S5: The vehicle control unit (VCU) detects the voltage of the vehicle's low-voltage circuit and determines whether the detected voltage of the vehicle's low-voltage circuit is less than 12 volts. If yes, proceed to S6; otherwise, proceed to S8.

[0022] S6: The vehicle control unit (VCU) determines whether the duration of the voltage of the vehicle's low-voltage circuit being less than 12 volts is greater than a preset time threshold. If yes, proceed to S4; otherwise, proceed to S8.

[0023] S7: After the vehicle control unit (VCU) has completed the debounce time, the instrument module will illuminate the DC / DC fault indicator light.

[0024] S8: End.

[0025] The vehicle low-voltage circuit power supply fault indication system and method of the present invention have the following advantages:

[0026] (1) The vehicle low-voltage circuit power supply abnormality prompting system and prompting method of the present invention can cover more vehicle low-voltage circuit power supply abnormality prompting scenarios and provide prompts without increasing the number of parts.

[0027] (2) After the vehicle low-voltage circuit power supply abnormality prompting system and prompting method of the present invention makes a prompt for the vehicle low-voltage circuit power supply abnormality, it can achieve the effect of timely reminding the driver and improving driving safety.

[0028] (3) The vehicle low-voltage circuit power supply abnormality prompting system and prompting method of the present invention can promptly remind the driver when there is a high-level fault in the DC / DC converter, communication abnormality between the vehicle controller (VCU) and the DC / DC converter, or a fault in the working status of the DC / DC converter, giving the driver more time to control the vehicle and making it safer. Attached Figure Description

[0029] This manual includes the following figures, which illustrate the following:

[0030] Figure 1 This is a logical structure block diagram of the vehicle low-voltage circuit power supply abnormality prompt system of the present invention;

[0031] Figure 2 This is a flowchart of the method for indicating abnormal power supply in the low-voltage circuit of a vehicle according to the present invention.

[0032] The attached diagram is labeled as follows: 1. Vehicle Controller (VCU); 2. Instrument Module; 3. DC / DC Converter. Detailed Implementation

[0033] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0034] Figure 1 This is a logical structure block diagram of the vehicle low-voltage circuit power supply fault indication system of the present invention, including a vehicle controller (VCU) 1, an instrument module 2, and a DC / DC converter 3. The vehicle controller (VCU) 1 is connected to the instrument module 2; the vehicle controller (VCU) 1 is also connected to the DC / DC converter 3. The vehicle controller (VCU) 1 and the DC / DC converter 3 are connected via both a bus and a hardwired connection. Furthermore, the instrument module 2 refers to the automotive instrument module.

[0035] The following is combined Figure 1 The working principle of the vehicle low-voltage circuit power supply abnormality warning system of the present invention is as follows:

[0036] When the vehicle low-voltage circuit power supply abnormality warning system of the present invention is working, the vehicle controller (VCU) 1 detects whether its communication with the DC / DC converter 3 is normal. That is, the vehicle controller (VCU) 1 will detect and determine whether its communication with the DC / DC converter 3 is lost. When the vehicle controller (VCU) 1 detects an abnormality in its communication with the DC / DC converter 3, that is, when the vehicle controller (VCU) detects that its communication with the DC / DC converter 3 is lost, the vehicle controller (VCU) 1 controls the instrument module 2 to illuminate the DC / DC fault indicator light after the fault diagnosis (debounce) time is met. To prevent misjudgment, the system can promptly alert the driver when communication between the vehicle controller (VCU) 1 and the DC / DC converter 3 is abnormal, giving the driver more time to control the vehicle and improving safety. When the vehicle controller (VCU) 1 detects that its communication with the DC / DC converter 3 is normal, that is, when the vehicle controller (VCU) 1 determines that its communication with the DC / DC converter 3 has not been lost, the DC / DC converter 3 feeds back its fault level information to the vehicle controller (VCU) 1, and at the same time, the DC / DC converter 3 feeds back its working status information to the vehicle controller (VCU) 1.When the DC / DC converter 3 sends a high-level fault feedback to the vehicle control unit (VCU) 1, the instrument module 2 of the VCU 1 illuminates the DC / DC fault indicator light. This promptly alerts the driver to the high-level fault of the DC / DC converter 3, giving the driver more time to control the vehicle and enhancing safety. Similarly, when the DC / DC converter 3 sends a fault feedback to the VCU 1, the instrument module 2 of the VCU 1 illuminates the DC / DC fault indicator light, again promptly alerting the driver to the fault status of the DC / DC converter 3 and giving the driver more time to control the vehicle, enhancing safety. When there is no fault and the feedback to the vehicle controller (VCU) 1 indicates that the working status is normal, the vehicle controller (VCU) 1 detects the voltage of the vehicle's low-voltage circuit. If the vehicle controller (VCU) 1 detects that the voltage of the vehicle's low-voltage circuit is less than 12 volts and the duration of the voltage being less than 12 volts is greater than a preset time threshold, then the vehicle controller (VCU) 1 controls the instrument module 2 to illuminate the DC / DC fault indicator light. That is, when the vehicle controller (VCU) 1 determines that the voltage of the vehicle's low-voltage circuit is less than 12 volts, the vehicle controller (VCU) 1 will determine whether the duration of the voltage being less than 12 volts is greater than a preset time threshold. If the vehicle controller (VCU) 1 determines that the duration of the voltage being less than 12 volts is greater than the preset time threshold, then the vehicle controller (VCU) 1 will control the instrument module 2 to illuminate the DC / DC fault indicator light. This allows for the coverage of more scenarios involving abnormal low-voltage circuit power supply in the vehicle without adding any components, thus providing timely reminders to the driver and improving driving safety.

[0037] Figure 2 This is a flowchart of the method for indicating abnormal power supply in the low-voltage circuit of a vehicle according to the present invention. The method includes the following steps:

[0038] S1: The vehicle control unit (VCU) 1 determines whether its communication with the DC / DC converter 3 is normal; if yes, proceed to S2; otherwise, proceed to S7; that is, the corresponding... Figure 2Specifically, when the vehicle low-voltage circuit power supply abnormality prompt system of the present invention is working, the vehicle controller (VCU) 1 will detect and determine whether its communication with the DC / DC converter 3 is normal, that is, the vehicle controller (VCU) 1 will detect and determine whether its communication with the DC / DC converter 3 is lost. If yes, it will proceed to S2; if no, it will proceed to S7.

[0039] S2: The DC / DC converter 3 feeds back its fault level information to the vehicle controller (VCU) 1; the DC / DC converter 3 feeds back its operating status information to the vehicle controller (VCU) 1; that is, corresponding to Figure 2 Specifically, when the vehicle controller (VCU) 1 detects that its communication with the DC / DC converter 3 is normal, that is, when the vehicle controller (VCU) 1 detects that its communication with the DC / DC converter 3 has not been lost, the DC / DC converter 3 will feed back its own fault level information to the vehicle controller (VCU) 1. At the same time, the DC / DC converter 3 will also feed back its own working status information to the vehicle controller (VCU) 1.

[0040] S3: Vehicle Controller Unit (VCU) 1 judges the information fed back by DC / DC converter 3; when the DC / DC converter 3 feeds back a high-level fault to VCU 1, it proceeds to S4; when the DC / DC converter 3 feeds back a fault status to VCU 1, it proceeds to S4; when the DC / DC converter 3 feeds back a fault-free status to VCU 1 and the operating status to VCU 1 is normal, it proceeds to S5; that is, corresponding to... Figure 2 S3 in the middle.

[0041] S4: The vehicle control unit (VCU) 1 instrument module 2 illuminates the DC / DC fault indicator light; proceed to S8; that is, the corresponding... Figure 2 In S4. Specifically, when the DC / DC converter 3 feeds back a high-level fault to the vehicle controller (VCU) 1 in S3, or when the operating status of the vehicle controller (VCU) 1 is a fault, the vehicle controller (VCU) 1 will control the instrument module 2 to illuminate the DC / DC fault indicator light.

[0042] S5: The vehicle control unit (VCU) 1 detects the voltage of the vehicle's low-voltage circuit and determines whether the detected voltage is less than 12 volts. If yes, proceed to S6; otherwise, proceed to S8. Figure 2 S5. Specifically, when the DC / DC converter 3 feeds back to the vehicle controller (VCU) 1 in S3 as fault-free and the operating status of the vehicle controller (VCU) 1 is normal, the vehicle controller (VCU) 1 will detect and determine whether the voltage of the vehicle's low-voltage circuit is less than 12 volts. If the vehicle controller (VCU) 1 determines that the voltage of the vehicle's low-voltage circuit is less than 12 volts, it will proceed to S6. If the vehicle controller (VCU) 1 determines that the voltage of the vehicle's low-voltage circuit is not less than 12 volts, it will proceed to S8.

[0043] S6: The vehicle control unit (VCU) 1 determines whether the duration for which the voltage in the vehicle's low-voltage circuit is less than 12 volts exceeds a preset time threshold. If yes, proceed to S4; otherwise, proceed to S8. Figure 2 S6. Specifically, when the vehicle controller (VCU) 1 determines that the voltage of the vehicle's low-voltage circuit is less than 12 volts, the vehicle controller (VCU) 1 will determine whether the duration of the voltage of the vehicle's low-voltage circuit being less than 12 volts is greater than a preset time threshold. If the vehicle controller (VCU) 1 determines that the duration of the voltage of the vehicle's low-voltage circuit being less than 12 volts is greater than the preset time threshold, then proceed to S4. If the vehicle controller (VCU) 1 determines that the duration of the voltage of the vehicle's low-voltage circuit being less than 12 volts is not greater than the preset time threshold, then proceed to S8.

[0044] S7: After the vehicle control unit (VCU) 1 has completed the debounce time, the instrument module 2 illuminates the DC / DC fault indicator light; that is, the corresponding... Figure 2 Specifically, in S7, when the vehicle controller (VCU) 1 detects an abnormality in its communication with the DC / DC converter 3 in S2, that is, when the vehicle controller (VCU) 1 detects a loss of communication with the DC / DC converter 3, the vehicle controller (VCU) 1 will control the instrument module 2 to illuminate the DC / DC fault indicator light after the fault diagnosis (Debounce) time is met. This prevents misjudgment and allows the driver to be promptly alerted when the communication between the vehicle controller (VCU) 1 and the DC / DC converter 3 is abnormal, giving the driver more time to control the vehicle and improving safety.

[0045] S8: End; corresponding to Figure 2 S8 in the middle.

[0046] In this specific embodiment, the preset time threshold is 5 seconds.

[0047] The role and effect of implementation

[0048] The vehicle control unit (VCU) 1 detects whether its communication with the DC / DC converter 3 is normal. Specifically, the VCU 1 checks whether communication with the DC / DC converter 3 is lost. When the VCU 1 detects an abnormality in communication with the DC / DC converter 3, i.e., when communication is lost, the VCU 1 controls the instrument module 2 to illuminate the DC / DC fault indicator light after the debounce time has elapsed to prevent false alarms. When the communication between the controller (VCU) 1 and the DC / DC converter 3 is abnormal, the driver is promptly alerted, giving the driver more time to control the vehicle, thus enhancing safety. When the vehicle controller (VCU) 1 detects that its communication with the DC / DC converter 3 is normal, that is, when the vehicle controller (VCU) 1 determines that its communication with the DC / DC converter 3 has not been lost, the DC / DC converter 3 feeds back its fault level information to the vehicle controller (VCU) 1, and at the same time, the DC / DC converter 3 feeds back its working status information to the vehicle controller (VCU) 1.When the DC / DC converter 3 sends a high-level fault feedback to the vehicle control unit (VCU) 1, the instrument module 2 of the VCU 1 illuminates the DC / DC fault indicator light. This promptly alerts the driver to the high-level fault of the DC / DC converter 3, giving the driver more time to control the vehicle and enhancing safety. Similarly, when the DC / DC converter 3 sends a fault feedback to the VCU 1, the instrument module 2 of the VCU 1 illuminates the DC / DC fault indicator light, again promptly alerting the driver to the fault status of the DC / DC converter 3 and giving the driver more time to control the vehicle, enhancing safety. When there is no fault and the feedback to the vehicle controller (VCU) 1 indicates that the working status is normal, the vehicle controller (VCU) 1 detects the voltage of the vehicle's low-voltage circuit. If the vehicle controller (VCU) 1 detects that the voltage of the vehicle's low-voltage circuit is less than 12 volts and the duration of the voltage being less than 12 volts is greater than a preset time threshold, then the vehicle controller (VCU) 1 controls the instrument module 2 to illuminate the DC / DC fault indicator light. That is, when the vehicle controller (VCU) 1 determines that the voltage of the vehicle's low-voltage circuit is less than 12 volts, the vehicle controller (VCU) 1 will determine whether the duration of the voltage being less than 12 volts is greater than a preset time threshold. If the vehicle controller (VCU) 1 determines that the duration of the voltage being less than 12 volts is greater than the preset time threshold, then the vehicle controller (VCU) 1 will control the instrument module 2 to illuminate the DC / DC fault indicator light. This allows for the coverage of more scenarios involving abnormal low-voltage circuit power supply in the vehicle without adding any components, thus providing timely reminders to the driver and improving driving safety.

[0049] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A method for indicating abnormal power supply in a vehicle's low-voltage circuit, characterized in that: The system includes a vehicle controller, an instrument module, and a DC / DC converter. The vehicle controller is connected to the instrument module, and the vehicle controller is also connected to the DC / DC converter. The method includes the following steps: S1: The vehicle controller determines whether its communication with the DC / DC converter is normal; if yes, proceed to S2; otherwise, proceed to S7. S2: The DC / DC converter feeds back its own fault level information to the vehicle controller; the DC / DC converter feeds back its own operating status information to the vehicle controller. S3: The vehicle controller judges the information fed back by the DC / DC converter; when the DC / DC converter feeds back a high-level fault to the vehicle controller, it enters S4; when the DC / DC converter feeds back a fault status to the vehicle controller, it enters S4; when the DC / DC converter feeds back a fault-free status to the vehicle controller and the vehicle controller's operating status is normal, it enters S5. S4: The vehicle controller illuminates the DC / DC fault indicator light on the instrument module; proceed to S8. S5: The vehicle controller detects the voltage of the vehicle's low-voltage circuit and determines whether the detected voltage of the vehicle's low-voltage circuit is less than 12 volts. If yes, proceed to S6; otherwise, proceed to S8. S6: The vehicle controller determines whether the duration of the low voltage circuit voltage of the vehicle being less than 12 volts is greater than the preset time threshold. If yes, proceed to S4; otherwise, proceed to S8. S7: After the fault diagnosis time is met, the vehicle controller will control the instrument module to illuminate the DC / DC fault indicator light; S8: End.

2. The prompting method of the vehicle low-voltage circuit power supply abnormality prompting system as described in claim 1, characterized in that: The preset time threshold is 5 seconds.

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