1981-02-01

Optimization of a Continuously Variable Transmission with Emission Constraints 810107

An optimization technique has been developed which can be used to compute the optimal control strategy for an engine/CVT configuration subject to emission constraints. (CVT stands for Continuously Variable Transmission). The engine/CVT system is represented as a function of the four independent variables: spark advance, air/fuel ratio, exhaust gas recirculation percentage, and CVT gear ratio. The Generalized Lagrange Multiplier Technique is used to optimize these variables at a set of drive shaft torque/speed points which represent operation of the vehicle over a drive cycle. Results are presented for idealized CVT's.

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