Design of Robust Optimal Controller for Hybrid Electric Vehicle by using Road Information

This article is introducing an engine on – off method for fuel optimization in hybrid electric vehicle's base on the road information. Simplicity, robustness and engine efficiency are advantages of this method. Based on the road information, the method calculates the balance point for electrical energy in energy storage system. This point is used for decision to engine operation. A major drawback with the proposed method is possibility of rapid engine on / off operation. By temporary changing the balance point to balance band, this drawback will be partly removed. Also the proposed method is enhanced by weighting the information and recalculating the balance point in the mission. The enhanced method is robust for large amount of error.