Vehicle low-voltage power supply system and hybrid power vehicle

Abstract

The invention belongs to the technical field of range extenders, and particularly relates to a vehicle low-voltage power supply system and a hybrid vehicle, the power supply system comprises a starting power supply used for being in power supply connection with a range extender and a direct current conversion module used for supplying power to a low-voltage load, and the direct current conversion module is further used for being in power supply connection with the range extender; the power supply system further comprises a decision control module, and the decision control module is used for enabling the direct current conversion module to be communicated with a power supply line of the range extender when the starting power supply fails, so that the direct current conversion module supplies power to the range extender, and starting of the range extender is guaranteed. Even in a severe environment, when a starting power supply fails, starting of the range extender can be guaranteed, and the endurance mileage of the vehicle is increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of range extenders, and in particular relates to a vehicle low-voltage power supply system and a hybrid vehicle. Background Art

[0002] As new energy vehicles become more and more popular, hybrid electric vehicles, as an important branch of new energy vehicles, occupy a considerable proportion of the market. The application scenarios of vehicles are becoming more and more extensive and professional, which puts higher requirements on the reliability of the whole vehicle. In order to achieve stable and safe operation of the vehicle throughout its life cycle, it is necessary to improve the quality characteristics of all aspects. As the source of power for low-voltage equipment such as the vehicle control system and auxiliary systems, the vehicle's low-voltage power supply plays an irreplaceable core role. In some complex working environments, such as high temperature, high humidity, salt spray, and even flammable and explosive environments, the discharge characteristics of the power battery are subject to severe challenges; in addition, if the engine or range extender starting power supply is not properly maintained, there is a risk of power loss, which greatly reduces the vehicle's range extension effect and significantly reduces its endurance.

[0003] The Chinese invention patent application with application publication number CN117267024A proposes a range-extended electric vehicle starting system, which uses a low-voltage starting power supply to power the range extender engine and automatic clutch. When the low-voltage starting power supply fails in harsh environments, the range extender cannot start and cannot convert fuel into electricity to drive the motor, significantly reducing its endurance.

[0004] The Chinese utility model patent with the authorization announcement number CN210564814U adds a silicone rubber heating belt and a carburetor to help the range extender start in order to ensure that the range extender starts normally in a low temperature environment. However, this technical solution is only effective for low temperature environments and when the starting power supply is normal. When the starting power supply fails in other complex working environments, the range extender cannot be guaranteed to start normally. Summary of the invention

[0005] The object of the present invention is to provide a vehicle low-voltage power supply system and a hybrid vehicle, so as to solve the technical problem that the vehicle endurance is reduced due to the failure of the starting power supply of the range extender.

[0006] In order to solve the above technical problems, the present invention provides a vehicle low-voltage power supply system, including a starting power supply for supplying power to a range extender and a DC conversion module for supplying power to a low-voltage load, wherein the DC conversion module is also used to supply power to the range extender. The power supply system also includes a decision control module, wherein the decision control module is used to connect the DC conversion module with the power supply line of the range extender when the starting power supply fails, so that the DC conversion module supplies power to the range extender to ensure the start-up of the range extender.

[0007] Furthermore, the decision control module is also used to connect the startup power supply with the power supply line of the low-voltage load when the DC conversion module fails, so that the startup power supply supplies power to the low-voltage load.

[0008] Furthermore, the power supply system also includes a first voltage and current detection device for detecting the voltage and current of the starting power supply, and the decision control module is used to determine whether the starting power supply is faulty according to the detection result of the first voltage and current detection device.

[0009] Furthermore, the power supply system also includes a second voltage and current detection device for detecting the voltage and current of the DC conversion module, and the decision control module is used to determine whether the DC conversion module is faulty according to the detection result of the second voltage and current detection device.

[0010] Furthermore, the power supply system also includes a first voltage and current detection device for monitoring the voltage and current of the starting power supply and a second voltage and current detection device for monitoring the voltage and current of the DC conversion module. The decision control module is also used to obtain the change trend of the real-time data based on the real-time data detected by the first voltage and current detection device and the second voltage and current detection device within a certain period of time, and compare the real-time data with the change trend of the corresponding historical data, and provide early warning of faults according to the comparison results.

[0011] The present invention is an improved invention, and its beneficial effects are as follows: the vehicle low-voltage power supply configuration system of the present invention is provided with a decision-making control module. The modified module can connect the power supply line of the DC conversion module and the range extender when the starting power fails, so as to ensure the starting of the range extender. Even if the vehicle is driving in a harsh environment and the starting power fails due to lack of maintenance, the range extender can be guaranteed to start normally to improve the vehicle's cruising range.

[0012] In order to solve the above technical problems, the present invention further provides a hybrid vehicle, characterized in that its vehicle low-voltage power supply configuration system is a low-voltage power supply system as described in a vehicle low-voltage power supply system of the present invention.

[0013] The beneficial effects are as follows: a hybrid vehicle of the present invention is provided with a decision control module in the low-voltage power supply system, and the module can connect the power supply line between the DC conversion module and the range extender when the starting power fails, so as to ensure the starting of the range extender. Even if the vehicle is traveling in a harsh environment and the starting power fails due to lack of maintenance, the range extender can be guaranteed to start normally to improve the vehicle's cruising range. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a diagram of a vehicle low-voltage power supply configuration system of a system embodiment of the present invention;

[0015] Figure 2Schematic diagram of the low voltage power supply configuration system layout of the system embodiment of the present invention.

[0016] Figure numerals: 1. starting power supply; 2. DC conversion module; 3. decision control module; 4. power battery pack; 5. range extender engine; 6. range extender generator; 11. first voltage and current detection device; 21. second voltage and current detection device. DETAILED DESCRIPTION

[0017] A vehicle low-voltage power supply configuration system and a hybrid vehicle of the present invention are provided with a decision control module. When the starting power fails, the decision control module connects the power supply line between the DC conversion module and the range extender to ensure the normal start of the range extender. This prevents the range extender from being unable to start and the vehicle's cruising range being reduced when the starting power fails due to lack of maintenance in a harsh environment, thereby ensuring the vehicle's cruising range and driving safety.

[0018] System Example:

[0019] A vehicle low-voltage power supply system of the present invention, such as Figure 1 The system comprises three parts: a starting power supply 1, a DC conversion module 2 and a decision control module 3. The starting power supply 1 and the DC conversion module 2 are connected to the decision control module 3, and the decision control module 3 controls the power output of the two to the corresponding low-voltage load. In this embodiment, a distributed layout structure is adopted, and the distribution position is as follows: Figure 2 As shown, the starting power supply 1, the DC conversion module 2, the range extender engine 5, and the range extender generator 6 are centrally installed at the rear end of the vehicle; as other implementations, a centralized layout structure may also be adopted.

[0020] The specific layout position of the decision control module 3 is as follows: Figure 2 As shown, it is installed at the lower part of the vehicle body, and the starting power supply 1, the DC conversion module 2 and the decision control module 3 are connected through power cables and control cables.

[0021] The starting power supply 1 uses two groups of 12V lead-acid batteries connected in series as the starting power supply 1 of the hybrid vehicle range extender generator 6; the vehicle power battery pack 4 uses 84 nominal 1.2V nickel-hydrogen battery packs as the power power supply, and the DC conversion module 2 converts the power power supply DC voltage into a 24V low-voltage DC power supply through DC conversion filtering.

[0022] The starting power supply 1 provides starting power for the range extender generator 6 or the range extender engine 5. Under normal circumstances, the range extender generator 6 or the range extender engine 5 can be directly operated by the starting power supply 1; the DC conversion module 2 converts the high voltage electricity of the power battery pack 2 into low voltage electricity to supply electricity to the low voltage equipment or load of the whole vehicle.

[0023] The output of the starting power supply 1 and the DC conversion module 2 is used as the input of the decision control module 3. Under normal circumstances, the decision control module 3 will not interfere with the switch or relay function of the starting power supply 1 and the DC conversion module 2 of the range extender generator 6. The electric energy of the starting power supply 1 and the DC conversion module 2 will be supplied to their respective corresponding load terminals.

[0024] When the starting power supply 1 is low on power or encounters other abnormal conditions, and cannot ensure the normal starting of the range extender generator 6, the decision control module 3 can supply the electric energy of the DC conversion module 2 to the range extender generator 6 to achieve its normal starting; when the power battery pack 4 fails or the output of other DC conversion modules is abnormal, resulting in the DC conversion module 2 being unable to ensure the normal operation of the low-voltage electrical equipment or load, the decision control module 3 can supply the electric energy of the starting power supply 1 to the low-voltage load of the DC conversion module 2 to achieve its normal operation.

[0025] The decision control module 2 has a manual switching mode and an automatic switching mode to complete the coordinated configuration of the low-voltage power supply and realize mutual backup between the two. Among them, the starting power supply 1 is equipped with a first voltage and current detection device 11, which can monitor the starting power supply voltage and current in real time; the DC conversion module 2 is equipped with a second voltage and current detection device 21, which can monitor the DC conversion module 2 voltage and current in real time. The data information monitored by the first voltage and current detection device 11 and the second voltage and current detection device 21 is sent to the decision control module 3 in real time. The decision control module 3 can periodically judge the working status of the starting power supply 1 and the DC conversion module 2 according to the normal working range and abnormal state of the pre-set current and voltage parameters.

[0026] In manual mode, if the starting power supply 1 is abnormal, the output is cut off to ensure the safety of the rear-end range extender generator 6; if the range extender needs to be started urgently, the DC conversion module 2 is connected to the range extender generator 6 by switching the switch to realize the emergency start of the range extender generator 6. If the DC conversion module output 2 is abnormal, the output is cut off to ensure the safety of the rear-end low-voltage equipment or load; then the starting power supply 1 is connected to the low-voltage equipment or load circuit by switching the switch to realize the normal operation of the vehicle low-voltage equipment or load in an emergency state, and the DC conversion module 2 output abnormality is judged as soon as possible.

[0027] In the automatic mode, the decision control module 3 is connected to the DC conversion module 2 and the starting power supply 1 by means of a communication bus, and its voltage and current data are monitored in real time to determine the status of the two. The decision control module 3 can make automatic decisions on abnormal situations based on the voltage and current data of the DC conversion module 2 and the starting power supply 1, and monitor the working status of the starting power supply 1 and the DC conversion module 2 by comparing the uploaded data with the set normal working voltage and current range. If an abnormal situation occurs, the faulty line is cut off in time. If necessary, the backup function is started, and emergency processing is achieved through another set of normally working power supplies (refer to the manual mode), thereby completing the coordinated configuration of the low-voltage power supply and realizing mutual backup between the two.

[0028] The decision control module 3 analyzes the real-time monitoring data and historical information such as voltage and current, eliminates the influence of changes in the environment and working status, obtains the change trend of the real-time data based on the real-time data within a certain period of time, and compares the change trend with the change trend of the same value in the historical data. At the same time, according to the pre-set abnormal state thresholds of different levels, it can predict the working status and development trend of the DC conversion module 2 and the starting power supply 1 within a certain range. When there is no abnormality in the real-time data but there is an abnormal trend, the decision control module 3 completes the early warning of abnormal situations.

[0029] The vehicle low-voltage power supply system of this embodiment has the following beneficial effects:

[0030] 1) Extend vehicle service life, simplify maintenance steps, and reduce maintenance and overhaul frequency;

[0031] 2) This configuration method can work around the clock, and the working process is not affected by whether the vehicle is started or running;

[0032] 3) The overall layout configuration is flexible, occupies little space, and is easy to install, disassemble and maintain;

[0033] 4) The optimized configuration of low-voltage power supply for hybrid vehicles is realized, further ensuring the endurance of hybrid or extended-range vehicles;

[0034] 5) In particular, the present invention can identify the abnormal state of the low-voltage power supply in advance by optimizing the decision-making control module, realize early warning of abnormal situations, and avoid the occurrence of unexpected situations as much as possible.

[0035] Vehicle Example:

[0036] The low voltage power supply configuration system of a hybrid vehicle of this embodiment is the vehicle low voltage power supply configuration system as described in the system embodiment. The specific structure, principle and beneficial effects of the system have been described in detail in the system embodiment, and will not be repeated in this embodiment.

Claims

1. A vehicle low-voltage power supply system, comprising a starting power supply for supplying power to a range extender and a DC conversion module for supplying power to a low-voltage load, characterized in that: The DC conversion module is also used to supply power to the range extender. The power supply system also includes a decision control module. The decision control module is used to connect the DC conversion module with the power supply line of the range extender when the startup power supply fails, so that the DC conversion module supplies power to the range extender to ensure the startup of the range extender.

2. The vehicle low-voltage power supply system according to claim 1, characterized in that: The decision control module is also used to connect the startup power supply to the power supply line of the low-voltage load when the DC conversion module fails, so that the startup power supply supplies power to the low-voltage load.

3. The vehicle low-voltage power supply system according to claim 1 or 2, characterized in that: The power supply system further comprises a first voltage and current detection device for detecting the voltage and current of the starting power supply, and the decision control module is used to determine whether the starting power supply is faulty according to the detection result of the first voltage and current detection device.

4. The vehicle low-voltage power supply system according to claim 1 or 2, characterized in that: The power supply system further comprises a second voltage and current detection device for detecting the voltage and current of the DC conversion module, and the decision control module is used to determine whether the DC conversion module is faulty according to the detection result of the second voltage and current detection device.

5. The vehicle low-voltage power supply system according to claim 1, characterized in that: The power supply system also includes a first voltage and current detection device for monitoring the voltage and current of the starting power supply and a second voltage and current detection device for monitoring the voltage and current of the DC conversion module. The decision control module is also used to obtain the change trend of the real-time data based on the real-time data detected by the first voltage and current detection device and the second voltage and current detection device within a certain period of time, and compare it with the change trend of the corresponding historical data, and provide early warning of faults according to the comparison results.

6. A hybrid vehicle, characterized in that: The vehicle low-voltage power supply configuration system is a low-voltage power supply system as described in any one of claims 1-5.

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