Powertrain control system based on wheel torque for future safer vehicles

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Powertrain control system based on wheel torque for future safer vehicles

Minowa, T. / Kuragaki, S. / Kayano, M. / Ochi, T. / Nakamura, K.

The powertrain control system of a vehicle with a 4-speed automatic transmission has been investigated with future safer vehicles in mind. It is important to keep smooth acceleration and to improve fuel economy during driver assisted driving (ACC: Adaptive Cruise Control) and automated driving. To meet these requirements, the powertrain control system based on wheel torque was found to be effective. The system provides efficient control for an engine so that the desired engine torque and transmission ratio are freely determined from the desired wheel torque. Moreover, it is possible to improve control performance for active safety measures because smooth acceleration is kept by managing the wheel torque. A test vehicle with automatic transmission utilizing an electronically controlled throttle valve was developed to verify the new powertrain control system which takes into consideration future safer vehicles. The effectiveness of the proposed powertrain control system during acceleration and deceleration was verified.