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AssigneesHitachi, Ltd., Hitachi Automotive Engineering Co., Ltd.
InventorsShigeyuki Yoshihara, Sanshiro Obara, Nobunori Matsudaira, Shotaro Naito
Estimating the term…
An electric vehicle control system which maintains good driving performance under normal conditions, and can cut off driving current upon malfunction of a microcomputer before restarting. A setting circuit of a comparing and operating circuit has a set signal fixed to V2 if an accelerator pedal is released. If a microcomputer malfunctions to drive an inverter absent a depression of the accelerator pedal, a current flows from a battery and a battery current sensor generates an output signal n. If this value exceeds V2, a comparator is turned on, which also turns on a transistor to energize a relay and disconnects an inverter drive signal s to break the power supply from an inverter to the ac motor. Upon disconnection, an alarm lamp is lit to issue an alarm to the driver. The disconnection is held by a delay circuit until the power is reset.
An apparatus for operating an AC electric motor system having an AC motor, an acceleration pedal, an inverter coupled to provide AC power to said AC motor, a battery coupled to provide a DC electric current to said inverter, and a control unit for controlling said inverter in response to said motor speed command input, said apparatus comprising:
Method of operating an AC electric motor system having an AC motor, a motor speed command input device for generating a motor speed command input according to a position of an accelerator pedal, an inverter coupled to provide AC power to said AC motor, a battery coupled to provide a DC electric current to said inverter, and a control unit for controlling said inverter in response to said motor speed command input, said method comprising the steps of:
Dependencies are inferred from the claim text.