The engine start requests are from the subsystems like the driver, the energy management, the engine system. There is no prioritization between different subsystems engine requests, which indicates that all system need to approve the stop and one single system can start the engine. When the final engine start request is decided, the engine start request should be considered first, then the transmission status should be focused on. The vehicle mode is dependent on the drive cycle mode, the engine status and the motor torque path. The vehicle test result shows that the engine status changes to the stopping mode after the motor gear is equal to the requested gear and both of the clutch is neutral to avoid the power loss. The result also shows that the smooth control of motor path changing progress improves the system efficiency and drivability performance.
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