A kind of electric vehicle electrical system motor controller mcu voltage discharge method
A motor controller and electric vehicle technology, applied in electric vehicles, vehicle components, electrical devices, etc., can solve the problems of electric shock risk and different voltage discharge methods, and achieve the effect of avoiding electric shock
Active Publication Date: 2021-03-23
HOZON NEW ENERGY AUTOMOBILE CO LTD
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Problems solved by technology
In the above technical solution, the discharge will stop if the bus voltage is lower than 60V or the discharge time is longer than 3s, resulting in the actual bus voltage still being greater than the safety voltage of the human body, and the maintenance personnel will get an electric shock when they touch the high-voltage components inside the motor controller during maintenance. Risk, and different working conditions, the way of voltage release should be different
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Embodiment 1
[0044] Such as Figure 1-2 As shown, a voltage discharge method for the motor controller MCU of the electric vehicle electrical system implemented in this implementation is used to avoid the risk of electric shock caused by touching the internal high-voltage components of the motor controller MCU when the electric vehicle is being maintained. The principle of MCU discharge is that the motor controller MCU requests the motor M to generate a certain demagnetization current to consume the capacitor voltage in the MCU.
[0045]Specifically, the electrical system includes the motor controller MCU, the motor M, the battery pack C, the battery management system BMS, the vehicle control VCU, the high-voltage power distribution box PDU, the AC charging port B, the DC charging port A and the corresponding on-board charger OBC, DC-DC converter DCDC; the high-voltage power distribution box PDU is electrically connected to the battery pack and on-board charger OBC, and the DC-DC converter ...
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The invention belongs to the field of pure electric vehicles and particularly relates to a voltage discharging method for a motor controller MCU of an electrical system of an electric vehicle. The electrical system comprises a motor controller MCU, a motor, a battery pack, a battery management system BMS, a vehicle control unit VCU, a high-voltage distribution box PDU, an alternating-current charging port, a direct-current charging port, a corresponding vehicle-mounted charger OBC and a corresponding direct-current-direct-current converter DCDC. By judging different working conditions of a electric vehicle, voltage discharge of the motor controller MCU in different modes is carried out, for example, active or passive voltage discharge of the motor controller MCU is carried out according tothe power-on state, the charging state, the fault state and the accident state of the whole vehicle. According to the technical scheme, the voltage of the MCU of the motor controller can be discharged under different working conditions, and the discharge voltage is controlled to be lower than the safety voltage, so that maintenance personnel are prevented from getting an electric shock when touching high-voltage components in the motor controller during maintenance.
Description
technical field [0001] The invention belongs to the field of pure electric vehicles, and in particular relates to a voltage discharge method for a motor controller MCU of an electric vehicle electrical system. Background technique [0002] In order to avoid the high-voltage risk of electric vehicle maintenance personnel touching the high-voltage components inside the motor controller when repairing electric vehicles, considering that the capacitor in the motor controller still has a high-voltage risk when the vehicle is charging or malfunctioning, it is considered After the vehicle discharge circuit is disconnected, the capacitor voltage of the motor controller needs to be discharged immediately to a safe voltage range. At the same time, it is also required to ensure that the MCU can be quickly discharged after a collision. Related technical documents, such as the patent document with application number 201610951512.5, disclose a method for discharging the bus voltage of the...
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IPC IPC(8): B60L3/00
CPCB60L3/0084
Inventor 陈立冲肖岩
Owner HOZON NEW ENERGY AUTOMOBILE CO LTD