Ac motor control for a vehicle having a multi-speed...

Details Ac motor control for a vehicle having a multi-speed... Ac motor control for a vehicle having a multi-speed...

B - Operations, Transporting

60

L

B60L 15/20 (2006.01) B60K 1/00 (2006.01)

Patent

CA 2358149

A control system for an AC electric motor on an electric vehicle deactivates the motor when the control system senses a shift in the mechanically coupled transmission extending between the motor rotor and the wheels. The transmission shift condition may be detected by comparing the current transmission ratio to the immediately preceding measured transmission ratio. If these differ, the motor is electrically deactivated. Two successive measures of the same transmission ratio in a range corresponding to a valid transmission ratio indicate the end of a transmission shift hence permitting the safe resumption of excitation of the motor based on the then current measured rotor speed.

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