Patent ID: 8262537
Filing Date: 2012-09-11
Classification: B60K,B60W,F16H,Y02T,Y10T

Abstract:
1. Method for operating a multi-mode hybrid transmission configured to transfer power between an input member and an output member and first and second torque machines in one of two continuously variable modes by selectively applying two selectable one-way clutches, the method comprising: operating the hybrid transmission in an initial continuously variable mode including applying the first selectable one-way clutch and controlling an input torque at the input member and motor torques of the first and second torque machines using a first kinematic relationship to achieve a preferred output torque; commanding the hybrid transmission to transition to operating in a target continuously variable mode including applying the second selectable one-way clutch and controlling the input torque at the input member and motor torques of the first and second torque machines using a second kinematic relationship to achieve the preferred output torque; and executing a multi-step process including transitioning the first selectable one-way clutch to a deactivated state, transitioning the second selectable one-way clutch to the applied state, and transitioning controlling the input torque at the input member and the motor torques of the first and second torque machines using the first kinematic relationship to using the second kinematic relationship to achieve the preferred output torque when rotational speeds of the first and second torque machines are substantially a synchronous speed, wherein executing the multi-step process comprises: