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This paper deals with an approximation method to obtain a sub-optimal control law in the field of energy regenerative active suspension. LQ control theory cannot be applied to this matter because the form of performance index is not quadratic, But, a sub-optimal control law is obtained by this method without regard to the form of performance index. Random road surface input simulation was carried out using the two-degree-of-freedom quarter-car model and results of this method and other usual control laws are compared. As a result, it is clarified that this method is useful to design energy regenerative control systems.

Approximation Method of Optimal Control Based on Calculus of Variations (2nd Report, Application to Energy Regenerative Active Suspension Control)