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Drive system for electric automobiles

  • US 5,453,930 A
  • Filed: 12/30/1992
  • Issued: 09/26/1995
  • Est. Priority Date: 02/08/1991
  • Status: Expired due to Term
First Claim
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1. A drive system for an electric automobile using a battery, comprising:

  • at least two electric motors connected to vehicle wheels independently of each other;

    sensor means for monitoring a vehicle travelling condition;

    means for deriving a required driving torque to be generated by said motors on the basis of said monitored vehicle travelling condition; and

    control means responsive to the magnitude of said required torque, for controlling said motors at a low power consumption mode wherein an electric power supply to each of said motors is controlled so that said motors are driven to generate said required torque within a highest possible motor efficiency range,wherein said control means includes decision means for comparing said required torque with a maximum torque of each of the motors and command means for controlling said electric power supply to each motor based on comparison results from said decision means and for operating at least one of said motors which would provide the highest possible motor efficiency at said required torque.

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