Patent ID: 6766874
Filing Date: 2004-07-27
Classification: B60K,B60L,B60W,F02D,F02N,Y02T,Y10S

Abstract:
A system for driving a hybrid vehicle comprising an engine; a motor/generator coupled to said engine; a main battery connected to said motor/generator through an electric power converter; an auxiliary battery connected to said main battery; and a controller for controlling said engine and said motor/generator; wherein:battery voltage of said main battery is higher than battery voltage of said auxiliary battery: said main battery is used as a power supply for an electromagnetic coil for driving an injector for said engine or intake and exhaust valves, whereby said electromagnetic coil is supplied with said battery voltage of said main battery which is higher than the battery voltage of said auxiliary battery; said driving motor is operable as a motor to generate driving force for propelling said hybrid vehicle, and is operable as a generator to generate electric power when driven by said hybrid vehicle, said electric power being supplied to said main battery via a converter; said controller has a plurality of operating modes for controlling said engine and said motor/generator, corresponding to a vehicle operating state and a charge ratio of said main battery; and said controller selects an engine running electric generating mode in which said engine is operated as a driving source for said vehicle and for said motor/generator, and electric power generated by said motor/generator is recovered to said main battery, when the charge ratio of said main battery is lower than a first predetermined value; an acceleration mode, in which said engine and said motor/generator are operated as the driving source of the vehicle, when the charge ratio of said main battery exceeds said first predetermined value, and an opening degree of an accelerator for operating said engine exceeds a second predetermined value; and an engine running mode in which only said engine is operated as the driving source of the vehicle, when the charge ratio of said main battery exceeds said first predetermined value, and said accelerator opening degree is smaller than said second predetermined value.