Patent ID: 6807470
Filing Date: 2004-10-19
Classification: B60H,F01P,F02D

Abstract:
A vehicle control system, comprising:an engine configured to drive a vehicle; an alternator as an auxiliary machine of said engine, driven mainly by the engine; an airconditioning compressor driven mainly by said engine and having a refrigerant discharge rate control unit capable of adjusting a refrigerant discharge rate per one rotation; a cooling motor fan driven by an electric power generated by said alternator, including a motor having a motor rotation speed control unit capable of adjusting a rotation speed of the motor, and being configured to introduce an outside air mainly to an airconditioning heat exchanger and an engine cooling heat exchanger; an engine cooling unit configured to adjust at least one of a water temperature and an oil temperature of said engine; and a control unit configured to control said engine and auxiliary machines, wherein said control unit includes an engine control section consisting of: a temperature-dependent engine control section configured to control a fuel consumption amount of said engine based on at least one of the water temperature and the oil temperature of the engine; a power-dependent engine control section configured to control the fuel consumption amount of said engine based on an electric power essentially consumed by said cooling motor fan in the vehicle; and an airconditioning-dependent engine control section configured to control the fuel consumption amount of said engine based on the refrigerant discharge rate of said airconditioning compressor, and wherein said control unit performs one of the following control operations: to derive, by an optimizing technique, a combination of controls over the auxiliary machines that minimizes the fuel consumption amount of said engine, to control the auxiliary machines; to control an object to be controlled involved in at least two engine control sections among the engine control sections, prior to other objects to be controlled, in order to minimize the fuel consumption amount of said engine; and to control the auxiliary machines in descending order to magnitude of motive power.