System and method for prompting abnormal power supply of low-voltage loop of whole vehicle

Abstract

The invention discloses a system and method for prompting abnormal power supply of a low-voltage loop of a whole vehicle, and belongs to the technical field of automobiles, and the method comprises the steps that a VCU judges whether communication between the VCU and a DC / DC converter is normal or not, if not, the VCU controls a DC / DC fault prompting lamp to be turned on after the fault diagnosis time is met, and if yes, the VCU controls the DC / DC fault prompting lamp to be turned on; if yes, the DC / DC converter feeds back fault information and working state information of the DC / DC converter to a vehicle control unit (VCU); and when the direct current / direct current (DC / DC) converter feeds back a high-grade fault or a fed back working state is a fault (Fault), the vehicle control unit (VCU) controls to lighten the direct current / direct current (DC / DC) fault prompting lamp. According to the prompt system and the prompt method for the power supply abnormity of the low-voltage loop of the whole vehicle, more prompt scenes for the power supply abnormity of the low-voltage loop of the whole vehicle can be covered and prompted under the condition of not increasing parts.

Description

Technical Field

[0001] The present invention belongs to the field of automobile technology, and in particular, relates to a prompting system and a prompting method for abnormal power supply of a low-voltage circuit of a whole vehicle. Background Art

[0002] At present, the existing warning for abnormal low-voltage circuit of the whole vehicle usually refers to the DC / DC converter reporting the fault status through bus messages when it is working abnormally, and then lighting up the DC / DC fault warning light. However, the current warning method is not perfect. For example, when the bus communication is lost, it is impossible to give a warning. If the vehicle continues to drive, it may cause the vehicle to suddenly break down, which poses a great driving safety hazard.

[0003] Patent CN113765166A discloses a DC / DC circuit, a fault detection method, a device and a vehicle. The DC / DC circuit includes: a DC / DC controller, which is connected to a low-voltage battery and a high-voltage battery pack respectively. The DC / DC controller includes: a current detection circuit for detecting the current at a 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 above patent cannot cover more warning scenarios and provide prompts for abnormal low-voltage circuit power supply of the entire vehicle without adding components. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a system and method for prompting abnormal low-voltage circuit power supply of a whole vehicle in view of the shortcomings of the prior art, so as to achieve the purpose of covering more prompting scenarios of abnormal low-voltage circuit power supply of the whole vehicle and providing prompts without adding components.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] The present invention provides a prompt system for abnormal power supply of a low-voltage circuit of a whole vehicle, comprising a vehicle controller (VCU), an instrument module, and a direct current / direct current (DC / DC) converter, wherein the vehicle controller (VCU) is connected to the instrument module; the vehicle controller (VCU) is connected to the direct current / direct current (DC / DC) converter.

[0008] Furthermore, the vehicle control unit (VCU) detects whether the communication between the vehicle control unit and the DC / DC converter is normal.

[0009] Furthermore, when the vehicle controller (VCU) detects that the communication between it and the DC / DC converter is abnormal, the vehicle controller (VCU) controls the instrument module to light up the DC / DC fault warning light after the fault diagnosis (Debounce) time is met.

[0010] Furthermore, when the vehicle controller (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 controller (VCU); the DC / DC converter feeds back its own working status information to the vehicle controller (VCU).

[0011] Furthermore, when the DC / DC converter feeds back a high-level fault to the vehicle control unit (VCU), the vehicle control unit (VCU) controls the instrument module to light up the DC / DC fault warning light.

[0012] Furthermore, when the working state of the DC / DC converter fed back to the vehicle control unit (VCU) is a fault, the vehicle control unit (VCU) controls the instrument module to light up the DC / DC fault warning light.

[0013] Further, when the DC / DC converter feeds back to the vehicle control unit (VCU) that there is no fault and the working state fed back to the vehicle control unit (VCU) is normal (Normal), the vehicle control unit (VCU) detects the voltage of the low-voltage circuit of the vehicle.

[0014] Furthermore, when the vehicle controller (VCU) detects that the voltage of the vehicle's low-voltage circuit is less than 12 volts and the duration of the voltage of the vehicle's low-voltage circuit being less than 12 volts is greater than a preset time threshold, the vehicle controller (VCU) controls the instrument module to light up the DC / DC (DC / DC) fault warning light.

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

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

[0017] S1: The vehicle control unit (VCU) determines whether the communication between it and the DC / DC converter is normal; if so, it enters S2, if not, it enters S7;

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

[0019] S3: The vehicle control unit (VCU) determines 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 enters S4; when the DC / DC converter feeds back a fault to the vehicle control unit (VCU), it enters S4; when the DC / DC converter feeds back no fault to the vehicle control unit (VCU) and the working state fed back to the vehicle control unit (VCU) is normal, it enters S5;

[0020] S4: The vehicle control unit (VCU) controls the instrument module to light up the DC / DC fault warning light; enter S8;

[0021] S5: The vehicle controller (VCU) detects the voltage of the vehicle low-voltage circuit and determines whether the detected voltage of the vehicle low-voltage circuit is less than 12 volts. If so, it enters S6, if not, it enters S8;

[0022] S6: The vehicle controller (VCU) determines whether the duration of the voltage of the low-voltage circuit of the vehicle being less than 12 volts is greater than a preset time threshold. If so, the process proceeds to S4; if not, the process proceeds to S8;

[0023] S7: The vehicle control unit (VCU) controls the instrument module to light up the DC / DC fault warning light after the fault diagnosis (Debounce) time is met;

[0024] S8: End.

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

[0026] (1) The system and method for prompting abnormal low-voltage circuit power supply of a vehicle of the present invention can cover more prompting scenarios of abnormal low-voltage circuit power supply of a vehicle and provide prompts without adding components.

[0027] (2) After the vehicle low-voltage circuit power supply abnormality prompt system and prompt method of the present invention are used to prompt the driver of the vehicle low-voltage circuit power supply abnormality, the driver can be reminded in time, thereby improving driving safety.

[0028] (3) Through the vehicle low-voltage circuit power supply abnormality prompt system and prompt method of the present invention, the driver can be reminded in time when a high-level fault occurs in the DC / DC converter, a communication abnormality occurs between the vehicle control unit (VCU) and the DC / DC converter, or a working state fault occurs in the DC / DC converter, thereby giving the driver more time to control the vehicle and making it safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] This specification includes the following drawings, which show the following contents:

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

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

[0032] The reference numerals in the drawings are: 1. vehicle control unit (VCU); 2. instrument module; 3. direct current / direct current (DC / DC) converter. DETAILED DESCRIPTION

[0033] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping 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 facilitating their implementation.

[0034] Figure 1 It is a logical structure block diagram of the prompt system of the abnormal power supply of the low-voltage circuit of the whole vehicle 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 connected to the DC / DC converter 3. Among them, the vehicle controller (VCU) 1 and the DC / DC converter 3 are connected through a bus and a hard line respectively. In addition, the instrument module 2 refers to an automobile instrument module.

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

[0036] When the vehicle low-voltage circuit power supply abnormality prompt system of the present invention is working, the vehicle controller (VCU) 1 detects whether the communication between it and the DC / DC converter 3 is normal, that is, the vehicle controller (VCU) 1 will detect and determine whether the communication between it and the DC / DC converter 3 is lost. When the vehicle controller (VCU) 1 detects that the communication between it and the DC / DC converter 3 is abnormal, that is, when the vehicle controller (VCU) detects that the communication between it and the DC / DC converter 3 is lost, the vehicle controller (VCU) 1 controls the instrument module 2 to light up the DC / DC fault prompt light after the fault diagnosis (Debounce) time is met. Preventing misjudgment, so that the driver can be reminded in time when the communication between the vehicle controller (VCU) 1 and the DC / DC converter 3 is abnormal, and the driver is given more time to control the vehicle, which is safer; 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 is not lost, the DC / DC converter 3 feeds back its own fault level information to the vehicle controller (VCU) 1, and at the same time, the DC / DC converter 3 feeds back its own working status information to the vehicle controller (VCU) 1.When the DC / DC converter 3 feeds back to the vehicle control unit (VCU) 1 a high-level fault, the vehicle control unit (VCU) 1 controls the instrument module 2 to light up the DC / DC fault warning light, that is, it can promptly remind the driver when the DC / DC converter 3 has a high-level fault, and reserve more time for the driver to control the vehicle, which is safer; when the working state of the DC / DC converter 3 feeds back to the vehicle control unit (VCU) 1 a fault (Fault), the vehicle control unit (VCU) 1 controls the instrument module 2 to light up the DC / DC fault warning light, that is, it can promptly remind the driver when the working state of the DC / DC converter 3 is faulty (Fault), and reserve more time for the driver to control the vehicle, which is safer; when the DC / DC converter 3 feeds back to the vehicle control unit (VCU) 1 When there is no fault and the working state fed back to the vehicle controller (VCU) 1 is normal (Normal), the voltage of the low-voltage circuit of the vehicle is detected by the vehicle controller (VCU) 1. When the vehicle controller (VCU) 1 detects that the voltage of the low-voltage circuit of the vehicle is less than 12 volts and the duration of the voltage of the low-voltage circuit of the vehicle is less than 12 volts is greater than the preset time threshold, the vehicle controller (VCU) 1 controls the instrument module 2 to light up the DC / DC fault warning light, that is, when the vehicle controller (VCU) 1 determines that the voltage of the low-voltage circuit of the vehicle is less than 12 volts, the vehicle controller (VCU) 1 will determine whether the duration of the voltage of the low-voltage circuit of the vehicle is less than 12 volts is greater than the preset time threshold. If the vehicle controller (VCU) 1 determines that the duration of the voltage of the low-voltage circuit of the vehicle is less than 12 volts is greater than the preset time threshold, the vehicle controller (VCU) 1 will control the instrument module 2 to light up the DC / DC fault warning light. Furthermore, it is possible to cover more warning scenarios of abnormal low-voltage circuit power supply in the vehicle and provide prompts without adding components, which can achieve the effect of reminding the driver in time and improve driving safety.

[0037] Figure 2 The flowchart of the method for prompting abnormal low-voltage circuit power supply of a vehicle of the present invention comprises the following steps:

[0038] S1: The vehicle control unit (VCU) 1 determines whether the communication between it and the DC / DC converter 3 is normal; if so, it enters S2, if not, it enters 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 so, it will enter S2, if not, it will enter S7.

[0039] S2: The DC / DC converter 3 feeds back its own fault level information to the vehicle controller (VCU) 1; the DC / DC converter 3 feeds back its own working status information to the vehicle controller (VCU) 1; that is, the corresponding Figure 2 Specifically, when the vehicle control unit (VCU) 1 detects and determines that the communication between it and the DC / DC converter 3 is normal, that is, when the vehicle control unit (VCU) 1 detects and determines that the communication between it and the DC / DC converter 3 is not lost, the DC / DC converter 3 will feed back its own fault level information to the vehicle control unit (VCU) 1, and the DC / DC converter 3 will also feed back its own working status information to the vehicle control unit (VCU) 1.

[0040] S3: The vehicle control unit (VCU) 1 determines the information fed back by the DC / DC converter 3; when the DC / DC converter 3 feeds back a high-level fault to the vehicle control unit (VCU) 1, it enters S4; when the DC / DC converter 3 feeds back a fault to the vehicle control unit (VCU) 1, it enters S4; when the DC / DC converter 3 feeds back a fault-free state to the vehicle control unit (VCU) 1 and the working state fed back to the vehicle control unit (VCU) 1 is normal, it enters S5; that is, the corresponding Figure 2 S3 in.

[0041] S4: The vehicle control unit (VCU) 1 controls the instrument module 2 to light up the DC / DC fault indicator light; enter S8; corresponding Figure 2 Specifically, when the DC / DC converter 3 feeds back a high-level fault to the vehicle control unit (VCU) 1 in S3 or the working state fed back to the vehicle control unit (VCU) 1 is a fault (Fault), the vehicle control unit (VCU) 1 controls the instrument module 2 to light up the DC / DC fault warning light.

[0042] S5: The vehicle controller (VCU) 1 detects the voltage of the vehicle low-voltage circuit and determines whether the detected voltage of the vehicle low-voltage circuit is less than 12 volts. If so, it enters S6, if not, it enters S8; that is, corresponding to Figure 2 S5 in. Specifically, when the DC / DC converter 3 feeds back to the vehicle control unit (VCU) 1 in S3 that there is no fault and the working state fed back to the vehicle control unit (VCU) 1 is normal (Normal), then the vehicle control unit (VCU) 1 will detect and determine whether the voltage of the low-voltage circuit of the vehicle is less than 12 volts. If the vehicle control unit (VCU) 1 determines that the voltage of the low-voltage circuit of the vehicle is less than 12 volts, it enters S6. If the vehicle control unit (VCU) 1 determines that the voltage of the low-voltage circuit of the vehicle is not less than 12 volts, it enters S8.

[0043] S6: The vehicle controller (VCU) 1 determines whether the duration of the voltage of the vehicle low-voltage circuit being less than 12 volts is greater than a preset time threshold. If so, it proceeds to S4; if not, it proceeds to S8; that is, corresponding to Figure 2 S6 in the process. Specifically, when the vehicle control unit (VCU) 1 determines that the voltage of the low-voltage circuit of the vehicle is less than 12 volts, the vehicle control unit (VCU) 1 will determine whether the duration of the voltage of the low-voltage circuit of the vehicle being less than 12 volts is greater than a preset time threshold. If the vehicle control unit (VCU) 1 determines that the duration of the voltage of the low-voltage circuit of the vehicle being less than 12 volts is greater than the preset time threshold, the process enters S4. If the vehicle control unit (VCU) 1 determines that the duration of the voltage of the low-voltage circuit of the vehicle being less than 12 volts is not greater than the preset time threshold, the process enters S8.

[0044] S7: The vehicle control unit (VCU) 1 controls the instrument module 2 to light up the DC / DC fault warning light after the fault diagnosis (Debounce) time is met; that is, the corresponding Figure 2 S7 in. Specifically, when the vehicle control unit (VCU) 1 detects and determines that the communication between it and the DC / DC converter 3 is abnormal in S2, that is, when the vehicle control unit (VCU) 1 detects and determines that the communication between it and the DC / DC converter 3 is lost, the vehicle control unit (VCU) 1 will control the instrument module 2 to light up the DC / DC fault warning light after the fault diagnosis (Debounce) time is met to prevent misjudgment, so that the driver can be reminded in time when the communication between the vehicle control unit (VCU) 1 and the DC / DC converter 3 is abnormal, and more time is reserved for the driver to control the vehicle, which is safer.

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

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

[0047] The role and effect of implementation

[0048] The vehicle controller (VCU) 1 detects whether the communication between it and the DC / DC converter 3 is normal, that is, the vehicle controller (VCU) 1 will detect whether the communication between it and the DC / DC converter 3 is lost. When the vehicle controller (VCU) 1 detects that the communication between it and the DC / DC converter 3 is abnormal, that is, when the vehicle controller (VCU) detects that the communication between it and the DC / DC converter 3 is lost, the vehicle controller (VCU) 1 controls the instrument module 2 to light up the DC / DC fault warning light after the fault diagnosis (Debounce) time is met to prevent misjudgment, so that the vehicle can When the communication between the controller (VCU) 1 and the DC / DC converter 3 is abnormal, the driver is reminded in time, so that the driver is given more time to control the vehicle, which is safer; 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 and determines that its communication with the DC / DC converter 3 is not lost, the DC / DC converter 3 feeds back its own fault level information to the vehicle controller (VCU) 1, and at the same time, the DC / DC converter 3 feeds back its own working status information to the vehicle controller (VCU) 1.When the DC / DC converter 3 feeds back to the vehicle control unit (VCU) 1 a high-level fault, the vehicle control unit (VCU) 1 controls the instrument module 2 to light up the DC / DC fault warning light, that is, it can promptly remind the driver when the DC / DC converter 3 has a high-level fault, and reserve more time for the driver to control the vehicle, which is safer; when the working state of the DC / DC converter 3 feeds back to the vehicle control unit (VCU) 1 a fault (Fault), the vehicle control unit (VCU) 1 controls the instrument module 2 to light up the DC / DC fault warning light, that is, it can promptly remind the driver when the working state of the DC / DC converter 3 is faulty (Fault), and reserve more time for the driver to control the vehicle, which is safer; when the DC / DC converter 3 feeds back to the vehicle control unit (VCU) 1 When there is no fault and the working state fed back to the vehicle controller (VCU) 1 is normal (Normal), the voltage of the low-voltage circuit of the vehicle is detected by the vehicle controller (VCU) 1. When the vehicle controller (VCU) 1 detects that the voltage of the low-voltage circuit of the vehicle is less than 12 volts and the duration of the voltage of the low-voltage circuit of the vehicle is less than 12 volts is greater than the preset time threshold, the vehicle controller (VCU) 1 controls the instrument module 2 to light up the DC / DC fault warning light, that is, when the vehicle controller (VCU) 1 determines that the voltage of the low-voltage circuit of the vehicle is less than 12 volts, the vehicle controller (VCU) 1 will determine whether the duration of the voltage of the low-voltage circuit of the vehicle is less than 12 volts is greater than the preset time threshold. If the vehicle controller (VCU) 1 determines that the duration of the voltage of the low-voltage circuit of the vehicle is less than 12 volts is greater than the preset time threshold, the vehicle controller (VCU) 1 will control the instrument module 2 to light up the DC / DC fault warning light. Furthermore, it is possible to cover more warning scenarios of abnormal low-voltage circuit power supply in the vehicle and provide prompts without adding components, which can achieve the effect of reminding the driver in time and improve driving safety.

[0049] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A vehicle low-voltage circuit power supply abnormality prompt system, characterized by: It includes a vehicle controller (VCU), an instrument module, and a direct current / direct current (DC / DC) converter. The vehicle controller (VCU) is connected to the instrument module; the vehicle controller (VCU) is connected to the direct current / direct current (DC / DC) converter.

2. A vehicle low-voltage circuit power supply abnormality prompt system as claimed in claim 1, characterized in that: The vehicle controller (VCU) detects whether the communication between it and the DC / DC converter is normal.

3. A vehicle low-voltage circuit power supply abnormality prompt system as claimed in claim 2, characterized in that: When the vehicle controller (VCU) detects that the communication between it and the DC / DC converter is abnormal, the vehicle controller (VCU) controls the instrument module to light up the DC / DC fault warning light after the fault diagnosis (Debounce) time is met.

4. A vehicle low-voltage circuit power supply abnormality prompt system as claimed in claim 2, characterized in that: When the vehicle controller (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 controller (VCU); the DC / DC converter feeds back its own working status information to the vehicle controller (VCU).

5. A vehicle low-voltage circuit power supply abnormality prompt system as claimed in claim 4, characterized in that: When the DC / DC converter feeds back a high-level fault to the vehicle controller (VCU), the vehicle controller (VCU) controls the instrument module to light up a DC / DC fault warning light.

6. A vehicle low-voltage circuit power supply abnormality prompt system as claimed in claim 4, characterized in that: When the working state of the DC / DC converter fed back to the vehicle control unit (VCU) is fault, the vehicle control unit (VCU) controls the instrument module to light up the DC / DC fault warning light.

7. A vehicle low-voltage circuit power supply abnormality prompt system as claimed in claim 4, characterized in that: When the DC / DC converter feeds back to the vehicle controller (VCU) that there is no fault and the working state fed back to the vehicle controller (VCU) is normal (Normal), the vehicle controller (VCU) detects the voltage of the low-voltage circuit of the vehicle.

8. A vehicle low-voltage circuit power supply abnormality prompt system as claimed in claim 7, characterized in that: When the vehicle controller (VCU) detects that the voltage of the vehicle's low-voltage circuit is less than 12 volts and the duration of the voltage of the vehicle's low-voltage circuit being less than 12 volts is greater than a preset time threshold, the vehicle controller (VCU) controls the instrument module to light up the DC / DC fault warning light.

9. A vehicle low-voltage circuit power supply abnormality prompt system as claimed in claim 8, characterized in that: The preset time threshold is 5 seconds.

10. A method for indicating abnormal low-voltage circuit power supply of a vehicle as claimed in any one of claims 1 to 9, characterized in that: The method comprises the following steps: S1: The vehicle control unit (VCU) determines whether the communication between it and the DC / DC converter is normal; if so, it enters S2, if not, it enters S7; S2: The DC / DC converter feeds back its own fault level information to the vehicle control unit (VCU); The DC / DC converter feeds back its own working status information to the vehicle control unit (VCU); S3: The vehicle control unit (VCU) determines 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 enters S4; when the DC / DC converter feeds back a fault to the vehicle control unit (VCU), it enters S4; when the DC / DC converter feeds back no fault to the vehicle control unit (VCU) and the working state fed back to the vehicle control unit (VCU) is normal, it enters S5; S4: The vehicle control unit (VCU) controls the instrument module to light up the DC / DC fault warning light; enter S8; S5: The vehicle controller (VCU) detects the voltage of the vehicle low-voltage circuit and determines whether the detected voltage of the vehicle low-voltage circuit is less than 12 volts. If so, it enters S6, if not, it enters S8; S6: The vehicle controller (VCU) determines whether the duration of the voltage of the low-voltage circuit of the vehicle being less than 12 volts is greater than a preset time threshold. If so, the process proceeds to S4; if not, the process proceeds to S8; S7: The vehicle control unit (VCU) controls the instrument module to light up the DC / DC fault warning light after the fault diagnosis (Debounce) time is met; S8: End.

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