초록 ▼

In an electric vehicle having a synchronous motor as the driving source, a control system and a control method for the electric vehicle can prevent over current inthe main circuit or over charging of the battery at the re-closing of an opened inverter relay and is always capable of operating the pow

In an electric vehicle having a synchronous motor as the driving source, a control system and a control method for the electric vehicle can prevent over current inthe main circuit or over charging of the battery at the re-closing of an opened inverter relay and is always capable of operating the power-train system in a better condition. A control method for an electric vehicle having an inverter for supplying a direct current electric power from a battery to the synchronous motor, a smoothing capacitor, connected to the inverter in parallel for smoothing the direct current electric power, an inverter control circuit and an inverter relay for connecting and disconnecting the inverter and the smoothing capacitor to and from the battery. The inverter is controlled so as to prevent current from flowing into or flowing out of the inverter until the re-closing operation of the inverter relay is completed when the opened inverter relay is re-closed.

대표청구항 ▼

[ What is claimed is:] [1.] A control method for an electric vehicle having a permanent magnet type synchronous motor for driving the electric vehicle, an inverter for converting a direct current electric power from a battery into an alternating electric power and for supplying the alternating elect

[ What is claimed is:] [1.] A control method for an electric vehicle having a permanent magnet type synchronous motor for driving the electric vehicle, an inverter for converting a direct current electric power from a battery into an alternating electric power and for supplying the alternating electric power to said synchronous motor, a smoothing capacitor for smoothing said direct current electric power and being connected to said inverter in parallel, inverter control means for controlling said inverter based on a torque reference and a motor current, inverter relays for connecting and disconnecting said inverter and said smoothing capacitor to and from said battery,wherein in a case when said inverter relay is re-closed after being disconnected while said synchronous motor is rotating, three-phase short circuit current is allowed to flow to said synchronous motor by bringing any one of a power element connected to a positive voltage side of said inverter and a power element connected to a negative voltage side of said inverter into conduction until the re-closing operation of said inverter relay is completed and the voltage of said smoothing capacitor is recovered to a voltage of said battery.