Motor vehicles – Power – Electric
Patent
1994-04-28
1996-08-27
Camby, Richard M.
Motor vehicles
Power
Electric
180 656, B60K 102
Patent
active
055491723
ABSTRACT:
The object of the present invention is to provide an electric drive system which ensures effective generation of torque from the start to the maximum speed, and extended cruising distance and upgraded running performances. The drive system according to the present invention is characterized in that, in a electric vehicle to be driven by the wheels which are driven by the rotary output of two or more motors, said two or more motors comprise at least two different types of motors, and the system is provided with the control means to adjust the share of the vehicle driving force to be generated by each of said motors in conformity to the running state of said vehicle. These two or more motors comprise a combination of a low speed drive motor and high speed drive motor, and a highly efficient motor is used as said low speed motor, while a motor having a greater capacity and greater base speed than said low speed drive motor is used as the high speed drive motor. The share of the driving force of said vehicle is controlled by the control means such that up to the maximum torque is generated by said low speed drive motor, with the remaining torque generated by said high speed drive motor.
REFERENCES:
patent: 4010407 (1977-03-01), Lombard
patent: 4099589 (1978-07-01), Williams
patent: 5099186 (1992-03-01), Rippel et al.
patent: 5148883 (1992-09-01), Tanaka et al.
Japan Abstract No. JP 4183206, vol. 16, No. 498 (M-1325), Oct. 15, 1992.
Masaki Ryoso
Miyazaki Taizou
Mutoh Nobuyoshi
Ohmae Tsutomu
Tajima Fumio
Camby Richard M.
Hitachi , Ltd.
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