Hybrid electric vehicle low-voltage power supply system and control method thereof

A hybrid electric vehicle and power supply system technology, applied in the direction of electric vehicles, current collectors, electrical components, etc., can solve problems that affect the service life of batteries, affect the performance of hybrid electric vehicles, and cannot meet the power requirements of low-voltage devices, so as to avoid Waste of fuel, effect of improving service life

Active Publication Date: 2018-08-21
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the engine is not working and there are many low-voltage devices currently used on the hybrid electric vehicle, the battery will soon appear in a state of power loss, so that it cannot meet the working power requirements of the low-voltage devices, and will affect the performance of the hybrid electric vehicle; at the same time, the battery Frequent power loss will also affect the service life of the battery

Method used

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  • Hybrid electric vehicle low-voltage power supply system and control method thereof
  • Hybrid electric vehicle low-voltage power supply system and control method thereof
  • Hybrid electric vehicle low-voltage power supply system and control method thereof

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Embodiment 1

[0029] like figure 1 As shown, the present embodiment provides a low-voltage power supply system for hybrid electric vehicles, including a battery, an engine for charging the battery, a controller connected to the battery and the engine, and an output terminal located at the battery and electrically connected to the battery. The current sensor of the controller, the current sensor is used to measure the discharge current of the battery. Wherein, the output end of the storage battery is provided with a terminal, and the current sensor is connected to the terminal. The controller refers to the vehicle controller of the hybrid electric vehicle, that is, the HCU, and the output terminal of the battery refers to the positive pole of the battery.

[0030] The hybrid electric vehicle low-voltage power supply system described in this embodiment, by setting a current sensor at the output end of the battery, is convenient for real-time detection of the power consumption of the battery,...

Embodiment 2

[0043] The present invention is a further optimization of the control method of the hybrid vehicle low-voltage power supply system described in Embodiment 1, image 3 It is a flow chart of the control method of the hybrid electric vehicle low-voltage power supply system described in this embodiment, combined below image 3 The method is described. The method includes the following steps:

[0044] S100. Acquiring the voltage of the storage battery in real time.

[0045] S200. Determine whether the voltage of the storage battery is lower than the first preset voltage, if not, return to S200 and execute S300; if yes, execute S400.

[0046] S300, there is no need to charge the battery, and the engine continues to maintain the current state.

[0047] If the voltage of the battery is not less than the first preset voltage, it means that the current power of the battery is sufficient to support the operation of the low-voltage device, and there is no need to charge the battery, and ...

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Abstract

The invention relates to the field of hybrid electric vehicles, and discloses a hybrid electric vehicle low-voltage power supply system which comprises a storage battery, an engine, a controller and acurrent sensor, wherein the engine charges the storage battery, the controller is connected to the storage battery and the engine, and the current sensor is arranged at an output end of the storage battery and electrically connected to the controller and used for measuring discharge current of the storage battery. The invention further discloses a control method of the hybrid electric vehicle low-voltage power supply system. The control method includes the steps: judging whether the voltage drop rate of the storage battery is larger than a preset rate or not when the voltage of the storage battery is lower than first preset voltage; charging the storage battery by the engine when the voltage drop rate of the storage battery is larger than the preset rate. Whether the engine needs to be charged or not is judged according to the voltage and the voltage drop rate of the storage battery, the storage battery is conveniently and timely charged by the engine, under-voltage of the storage battery is avoided, and the service life of the storage battery and reliability of the hybrid electric vehicles cannot be affected.

Description

technical field [0001] The invention relates to the field of hybrid electric vehicles, in particular to a low-voltage power supply system of a hybrid electric vehicle and a control method thereof. Background technique [0002] The engine of the hybrid electric vehicle has the function of starting and stopping and has a battery that provides electric energy for the work of the low-voltage device. The battery, the engine and the controller of the hybrid electric vehicle together constitute the low-voltage power supply system of the hybrid electric vehicle. When the DCDC power supply module is not installed on the hybrid vehicle, if the power of the battery is insufficient, the battery needs to be charged by the engine in time to support the work of the low-voltage device. If the engine is not working and there are many low-voltage devices currently used on the hybrid electric vehicle, the battery will soon appear in a state of power loss, so that it cannot meet the working pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60R16/03H02J7/00
CPCB60R16/03H02J7/0029H02J7/0077
Inventor 战东红泮振锋李可敬娄丙民曹洪民
Owner WEICHAI POWER CO LTD
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