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A process to design the control algorithm for an integrated powertrain system is proposed in this paper. The driver accelerator pedal position is first measured and interpreted as a power request. This power request is then satisfied by coordinating the transmission gear shift and the throttle position. The Dynamic Programming (DP) technique is used to obtain the optimal gear shift and throttle position for each predetermined constant power demands over a time horizon. The optimal results at different power levels are then combined to form a gear map and a throttle map. Flexible control architecture is presented where the relationship between the accelerator pedal rotation angle and the throttle opening angle can be adjusted according to the preference of the targeting customer group. Simulation and dyno test results show that the proposed integrated control scheme provides smooth constant power and improves fuel efficiency compared with the conventional transmission control scheme.

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