Method and device for controlling engine torque in a multi-mode drive train system

A powertrain system includes an engine and a multi-mode transmission, which is configured to transfer torque between the combustion engine, the first and second torque machine and an output member. The input member comprises a coupling member which is configured to prevent rotation of the engine in a first direction. In response to an output torque request, when the engine is in an OFF state, the motor torques from the first and second torque machine are controlled in response to the output torque request, the controlling the engine torque of the first torque machine with a positive torque is greater than a minimum includes positive torque, and controlling the engine torque from the second torque machine in response to the output torque request and in response to the engine torque from the first torque machine.