Patent ID: 8373375
Filing Date: 2013-02-12
Classification: B60K,B60L,F16H,H02P,Y02T

Abstract:
1. In an electro-mechanical drive system that includes a movable power output component and further includes a plurality of electric drive motors, apparatus comprising: a first transfer mechanism that is connectable to and disconnectable from each of said motors, for transferring power from each connected motor to cause said output component to move at a first speed relative to the motor speed, comprising a first speed ratio, and to deliver power at a specified constant level when moving at said first speed ratio; a second transfer mechanism that is connectable to and disconnectable from each of said motors, for transferring power from each connected motor to cause said output component to move at a second speed relative to the motor speed, comprising a second speed ratio, and to deliver power at said specified constant level when moving at said second speed ratio; shift means for selectively connecting each motor to, and disconnecting each motor from, the first and second transfer mechanisms, respectively; a source for selectively supplying electric current to each of said motors; and a control device connected to perform a set of tasks when each of said motors are simultaneously connected to the first transfer mechanism, said set of tasks comprising: