Electric vehicle driving and charging integrated control method and electric vehicle operated with same

Abstract

The invention discloses an electric vehicle driving and charging integrated control method and an electric vehicle operated with the same. A driving function and a charging function are achieved through a topology system structure of the same hardware. The electric vehicle comprises a high-voltage battery, an inverter and a motor. When the electric vehicle is in a driven state, a high-voltage direct current output by the high-voltage battery is converted into a three-phase alternating current through the inverter through forward operation control of the inverter, the three-phase alternating current is output to the motor, and the motor is driven to run. When the electric vehicle is in a charged state, an external three-phase alternating current is input into the motor, then input into the inverter through a coil winding of the motor, and converted into a direct current to charge the high-voltage battery through reverse operation control of the inverter. The high-voltage battery is charged by means of the coil winding, serving as charging inductance, of the motor and by means of reverse operation of a motor driving system which is the inverter. In the charged state, the coil winding of the motor serves as the charging inductance, the inverter becomes a charger, the structure is simpler, control is easy and convenient, the size is compact, cost is low, the charging capability at full-power driving is achieved, charging speed is high, and efficiency is high.

Description

Technical field: [0001] The invention relates to an electric vehicle driving and charging integrated control method and an electric vehicle applied thereto. Background technique: [0002] The existing electric vehicle uses an inverter (INVERTER) to drive the motor. The high-voltage direct current output by the high-voltage battery is converted into a 3-phase AC output to the motor through the inverter. When the high-voltage battery power is low, the high-voltage battery needs to be charged. Otherwise the car cannot be driven. The existing charging methods for high-voltage batteries mainly include the following two methods: [0003] The first way is as figure 1 As shown, the 3-phase power supply is replaced by an independent charger with high-voltage direct current to charge the high-voltage battery, which obviously increases the number of independent chargers, resulting in complex product structure and high cost. In addition, the operating principle of this charger is base...

AI Technical Summary

Problems solved by technology

When charging, it is first necessary to cut off the connection between the inverter and the three-phase winding of the motor through the switch K1, and the single-phase power supply is connected to the inverter through the inductor L and converted into high-voltage DC by the rectifier to charge the high-voltage battery. For this structure, see US Patent US8441229 (B2). In this way, their topology is the concept of traditional chargers, that is, rectifier + three-phase interleaved DC / DC; an additional inductor L is required, which is large in size and high in cost. , the charging efficiency is low, because the use of two-stage power conversion, that is, AC AC-DC DC-AC, requires a new charger controller including AC / DC and DC / DC, and the control is more complicated

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