Precharge control circuit and control method for high-voltage system of hybrid electric vehicle

A hybrid vehicle and high-voltage system technology, applied in electric vehicles, electrical devices, vehicle components, etc., can solve problems such as vehicle damage or injury, potential safety hazards, electric shock, etc., to improve the safety of use, save production costs, guarantee The effect of personal safety

Active Publication Date: 2017-10-17
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The damage of the high-voltage relay, such as adhesion, has a great potential safety hazard, which will cause damage or injury to the vehicle, passengers, and vehicle maintenance personnel
The current method of judging whether the pre-charging of the high-voltage system is completed is to first close the total negative relay and the pre-charging relay, and then the BMS collects the total voltage of the battery pack and the voltage at both ends of the capacitor, and compares the difference. When the difference is less than a certain value, Determine

Method used

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  • Precharge control circuit and control method for high-voltage system of hybrid electric vehicle

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Effect test

Embodiment 1

[0018] A pre-charge control circuit for a high-voltage system of a hybrid electric vehicle, such as figure 1 As shown, it includes the power battery pack 1, the main positive relay 2, the main negative relay 3, the pre-charging relay 4, the capacitor 5 and the motor 6, and one end of the main positive relay 2 and the main negative relay 3 is respectively connected to the positive end of the power battery pack 1 , the negative terminal, the other end of the main positive relay 2 and the main negative relay 3 are connected to the motor 6, the capacitor 4 is connected to both ends of the motor 6 in parallel, and the pre-charging relay 4 is connected in series with the pre-charging resistor 7 and then connected to the main positive relay 2 A parallel circuit 8 is formed at both ends, and a shunt 9 is provided between the parallel circuit 8 and the positive terminal of the power battery pack 1 .

Embodiment 2

[0020] A kind of precharge control method of hybrid electric vehicle high voltage system, according to the precharge control circuit of hybrid electric vehicle high voltage system as described in embodiment 1, carry out according to the following steps,

[0021] Ⅰ After the weak current is connected to the high-voltage system, the BMS controls and closes the main negative relay, and the BMS collects the current value of the shunt at this time and uses it as the initial value of the current I 0 , and then execute step II;

[0022] Ⅱ BMS controls the closed pre-charging relay to pre-charge the capacitor, and the BMS collects the current value I of the shunt every 2ms n , calculate the current slope value L of the shunt in turn according to the formula (a) n and the current slope value of the shunt L n Stored in a data buffer of the BMS in turn, the data buffer is a queue structure, and its update method is first-in-first-out. If the high-voltage system meets the following thre...

Embodiment 3

[0026] A pre-charging control method for a high-voltage system of a hybrid electric vehicle, the steps of which are similar to the pre-charging control method for the high-voltage system of a hybrid electric vehicle in Embodiment 2, the difference being that in step II, the BMS collects the current of the shunt The value interval time T is 800μs, and the condition (1) is that the BMS detects that the current slope values ​​of the shunt for the last 30 consecutive times are all distributed in the range of -0.2 ~ 0.1mA / ms.

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Abstract

The invention provides a precharge control circuit for a high-voltage system of a hybrid electric vehicle. The precharge control circuit for the high-voltage system of the hybrid electric vehicle comprises a power battery pack, a main positive relay, a main negative relay, a precharge relay, a capacitor and a motor; one end of the main positive relay and one end of the main negative relay are correspondingly connected to the positive electrode and the negative electrode of the power battery pack, and the other end of the main positive relay and the other end of the main negative relay are connected with the motor; the capacitor is connected to both ends of the motor in parallel; the precharge relay is connected with a precharge resistor in series and then connected to both ends of the main positive relay to form a parallel circuit; and a shunt is arranged between the parallel circuit and the positive electrode of the power battery pack. Meanwhile, a precharge control method using the precharge control circuit is provided. According to the precharge control circuit and the control method for the high voltage system of the hybrid electric vehicle, through the current value collected by the shunt and the current slope value in the interval time, whether precharging of the high voltage system is completed or not is judged, the method is simple, the high voltage part does not need to be introduced into a BMS, and the safety is high.

Description

technical field [0001] The invention relates to the control field of hybrid electric vehicles, in particular to a pre-charging control circuit and a control method of a high voltage system of a hybrid electric vehicle. Background technique [0002] With the growth of population and economy, energy and environmental issues have prompted countries to develop new energy vehicles, energy-saving and environment-friendly vehicles. Hybrid electric vehicles are energy-saving and environmentally friendly, and have a broad market space and good development prospects. [0003] A hybrid vehicle is powered by an engine that consumes petroleum fuel and controls a motor driven by electricity supplied from a power battery pack. Hybrid electric vehicle power battery packs are usually composed of multiple batteries stacked in series, and a typical power battery pack is about several hundred volts. As a power component that controls a strong electric signal with a weak electric signal, a rel...

Claims

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Application Information

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IPC IPC(8): B60L3/00
Inventor 李旦钟发平陈祥朱建新储爱华周泉石云烽
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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