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International Journal of Automotive Technology > Volume 19(4); 2018 > Article
International Journal of Automotive Technology 2018;19(4): 687-694.
doi: https://doi.org/10.1007/s12239-018-0066-4
MODEL-BASED INTEGRATED CONTROL OF ENGINE AND CVT TO MINIMIZE FUEL USE
Heeyun Lee1, Juyean Sung2, Hyeokjun Lee3, Chunhua Zheng4, Wonsik Lim5, Suk Won Cha1
1Seoul National University
2Seoul National University of Science & Technology
3Hyundai Motor Company
4Chinese Academy of Sciences
5Seoul National University of Technology
ABSTRACT
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 Words: Continuously variable transmission, Integrated control, Fuel consumption, Model-based control
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