Discharging method of new energy automobile for bus high voltage

A new energy vehicle, bus voltage technology, applied in electric vehicles, current collectors, electrical devices, etc., can solve the problems of bus voltage rise, high voltage risk, etc., and achieve the effect of rapid discharge time

Active Publication Date: 2016-01-27
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Description
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  • Application Information

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Problems solved by technology

However, if the permanent magnet synchronous motor is pulled up again at high speed (such as being dragged by the engine in a collision condition), the energy of the permanent magnet synchronous motor will be fed back to the bus capacitor, causing the bus voltage to cause high voltage risk again
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Method used

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  • Discharging method of new energy automobile for bus high voltage
  • Discharging method of new energy automobile for bus high voltage
  • Discharging method of new energy automobile for bus high voltage

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Embodiment Construction

[0025] see figure 1 , The busbar high-voltage discharge system of the new energy vehicle of the present application is a high-voltage battery, a battery management system, an inverter, a motor controller, and a permanent magnet synchronous motor commonly used in new energy vehicles. On this basis, there is no need to add additional hardware structures such as discharge resistors and DC-DC converters, thereby achieving the lowest cost.

[0026] see Figure 4 , the method for discharging the high voltage of the busbar by the new energy vehicle of the present application comprises the following steps:

[0027] In the first step, when the ignition switch is turned off or the vehicle collides and other severe working conditions occur, the vehicle controller sends a command to discharge the high voltage of the bus to other node units. After receiving the discharge instruction, the battery management system disconnects the connection between the high-voltage battery and the input t...

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Abstract

The invention discloses a discharging method of a new energy automobile for bus high voltage. The discharging method comprises the following steps that firstly, when a hybrid control unit(HCU) sends out a discharging instruction, a battery management system enables a high-voltage battery and an inverter to be disconnected; secondly, a motor controller controls six power switching devices in the inverter, so that the direct-axis current of a permanent magnet synchronous motor is reduced along with reduction of the bus voltage, the quadrature-axis current is zero all the time, and thus the energy of a bus capacitor is consumed inside the permanent magnet synchronous motor; and thirdly, when the bus voltage value is lowered to be within a safe voltage range within given time, the motor controller enables three phases of the permanent magnet synchronous motor to be initiatively shortly circuited, or the direct-axis current and the quadrature-axis current of the permanent magnet synchronous motor are made to be both zero, and otherwise, the motor controller enables the three phases of the permanent magnet synchronous motor to be initiatively shortly circuited and feeds back a discharging overtime fault to the HCU. By means of the discharging method, the discharging time is short, safety and reliability are achieved, and the bus voltage cannot rise again after discharging is completed.

Description

technical field [0001] The present application relates to a method for safely discharging high voltage of a busbar by a new energy vehicle. Background technique [0002] see figure 1 , The motor drive system of new energy vehicles (electric vehicles, hybrid vehicles, etc.) mainly includes high-voltage batteries, inverters, and permanent magnet synchronous motors. A high-voltage battery refers to a battery pack with an output DC voltage higher than 100V, which is controlled by a battery management system (BMS). The inverter is used to convert the DC output from the high-voltage battery into AC to drive the permanent magnet synchronous motor. The motor controller is used to control the turn-on or turn-off of each power switching device in the inverter, and to control the permanent magnet synchronous motor. Common control strategies of motor controllers for permanent magnet synchronous motors include PWM (pulse width modulation), SPWM (sine wave pulse width modulation), SVPW...

Claims

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Application Information

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IPC IPC(8): B60L3/00B60R16/02H02J7/00
Inventor 刘志明吴璐璐卢志坚
Owner UNITED AUTOMOTIVE ELECTRONICS SYST
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