Model-Based Integrated Control of Engine and CVT to Minimize Fuel Use
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In this study, a model-based integrated control method for engines and continuous variable transmissions (CVTs) is developed. CVT refers to a type of transmission which allows an engine to be operated independently with respect to the vehicle speed, with the engine torque and CVT gear ratio controlled in an integrated manner. In the proposed integrated control scheme, engine operating points which minimize the rate of instantaneous fuel consumption are calculated, and the engine target torque and target gear ratio are determined in an integrated manner based on the results of the calculations. Unlike the previous map-based control method, the method introduced in this study does not require an engine torque map or a CVT ratio map for tuning, and the engine torque and CVT ratio are controlled to minimize the amount of fuel used while satisfying the level of acceleration demand from the driver. The control scheme is based on the powertrain model, and the CVT response lag and transmission loss are also considered in the integrated control processes. The algorithm is simulated with various driving cycles, with the simulation results showing that the fuel economy performance of the vehicle system is improved with the newly suggested engine-CVT integrated control algorithm.
Key WordsContinuously variable transmission Integrated control Fuel consumption Model-based control
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- Brace, C. J., Deacon, M., Vaughan, N. D., Horrocks, R. W. and Burrows, C. R. (1999). An operating point optimizer for the design and calibration of an integrated diesel/continuously variable transmission powertrain. Proc. Institution of Mechanical Engineers, Part D: J. Automobile Engineering 213, 3, 215–226Google Scholar
- Kim, T. and Kim, H. (2002). Performance of integrated engine-CVT control considering powertrain loss and CVT response lag. Proc. Institution of Mechanical Engineers, Part D: J. Automobile Engineering 216, 7, 545–553Google Scholar
- Lee, H. and Kim, H. (2002). Improvement of fuel economy by shift speed control for a metal belt continuously variable transmission. Proc. Institution of Mechanical Engineers, Part D: J. Automobile Engineering 216, 9, 741–749Google Scholar
- Sakaguchi, S., Kimura, E. and Yamamoto, K. (1999). Development of an engine-CVT integrated control system. SAE Paper No. 1999–01-0754Google Scholar
- Yasuoka, M., Uchida, M., Katakura, S. and Yoshino, T. (1999). An integrated control algorithm for an SI engine and a CVT. SAE Paper No. 1999–01-0752Google Scholar
- Yeo, H., Song, C., Kim, C. and Kim, H. (2004). Hardware in the loop simulation of hybrid vehicle for optimal engine operation by CVT ratio control. Int. J. Automotive Technology 5, 3, 201–208Google Scholar