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Voltage protection method of high-voltage bus of electric vehicle

A bus voltage, electric vehicle technology, applied in the field of electric vehicle high-voltage bus voltage protection, electric vehicle high-voltage bus field, can solve problems such as high-voltage bus voltage elevation, and achieve the effect of solving abnormal elevation

Active Publication Date: 2017-12-12
ZHENJIANG HELMHOLTZ HEAT TRANSFER TRANS SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a protection method for the high-voltage bus voltage of an electric vehicle, which uses a heater as a current discharge circuit to stabilize the high-voltage bus voltage protection method, and solves the problem of the high-voltage bus voltage of the vehicle without increasing the system volume and cost. unusually elevated problems

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  • Voltage protection method of high-voltage bus of electric vehicle
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  • Voltage protection method of high-voltage bus of electric vehicle

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] Such as figure 1 As shown, it is a schematic diagram of the connection of the high-voltage system of an electric vehicle. When the motor is running at high speed, there will be a high counter electromotive force, thereby raising the voltage of the high-voltage bus. When the voltage of the high-voltage bus is higher than the voltage of the battery, the motor will charge the battery, but the high-voltage bus When the voltage is too high, the battery controller will disconnect the battery system from other high-voltage systems for self-protection, such as figure 2 As shown, the energy on the high-voltage bus cannot be dissipated, and the voltage on the bus will continue to rise, thus damaging the high-voltage devices.

[0035] In the present invention, under the condition of not additionally adding a discharge circuit, in order to avoid ...

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Abstract

The invention discloses a voltage protection method of a high-voltage bus of an electric vehicle. The protection method comprises the following steps: 1) an overall vehicle controller is enabled to work; 2) a voltage acquiring period and a control period are set as 0.5 ms; 3) the voltage is detected; 4) the discharge power of a heater is calculated; and the discharge is performed; and 5) a voltage protection function of the overall vehicle controller is closed; and the voltage acquiring period and the control period are set as 0.5 ms. The protection method for stabilizing the voltage of the high-voltage bus by using the heater as a current leakage circuit solves the problem of abnormal rise of the voltage of the vehicle high-voltage bus under the condition of not increasing the system size and cost.

Description

technical field [0001] The invention relates to a high-voltage bus of an electric vehicle, in particular to a voltage protection method for a high-voltage bus of an electric vehicle, and belongs to the technical field of electric vehicle equipment. Background technique [0002] The drive motor of an electric vehicle affects the voltage on the high-voltage bus during different operating states. When the motor's back EMF exceeds the battery voltage, it raises the voltage on the high voltage bus, keeping the battery charged. If the motor control is poor due to, for example, a faulty motor controller, the voltage on the high voltage bus will be too high. In order to protect the battery, the vehicle control system will open the battery output relay. In the above working conditions, the high-voltage system is in a protected state, and the vehicle no longer has driving force. When the vehicle is in a high-speed state, no driving force is very dangerous. Excessive voltage on the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L3/00
CPCY02T90/16B60L3/00
Inventor 花睿常涛
Owner ZHENJIANG HELMHOLTZ HEAT TRANSFER TRANS SYST CO LTD