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.
Discharging method of new energy automobile for bus high voltage
2016-01-27
Patent
Electronic Resource
English
IPC: | B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung |
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