Abstract

A hybrid vehicle includes an engine for producing propulsive forces, an electric motor for selectively generating assistive drive forces in addition to the propulsive forces and generating electric energy converted from the propulsive forces, and an energy storage unit for selectively supplying electric energy to the electric motor and storing electric energy converted by the electric motor. A control system for the hybrid vehicle has an idling state detecting unit for detecting an idling state of the engine, a rotational speed variation detector for detecting a rotational speed variation of the engine in the idling state of the engine, a memory for storing a plurality of fuzzy rules and membership functions to determine an operating state of the motor to suppress the rotational speed variation of the engine from the rotational speed variation of the engine according to a fuzzy inference process, a goodness-of-fit calculator for determining respective goodnesses of fit of the fuzzy rules based on the membership functions from the rotational speed variation of the engine in the idling state of the engine, a goodness-of-fit combiner for combining the goodnesses of fit as determined by the goodness-of-fit calculator to determine an operating state of the motor, a motor controller for controlling the electric motor based on the operating state of the motor as determined by the goodness-of-fit combiner.

Other References

• European Search Report
• Database WPI Section PQ, Week 9549, JP 07 208 228