Patent ID: 6907948
Filing Date: 2005-06-21
Classification: B60K,B60L,B60W,Y02T

Abstract:
1. A control apparatus for a hybrid vehicle propelled only by a single engine and a single motor, in which said single engine and said single motor are directly connected, comprising: the single engine for outputting a driving force of the hybrid vehicle; the single motor for generating an auxiliary driving force for assisting the engine output; a battery device for supplying electric power to the single motor and for storing regenerative energy obtained by a regenerative operation of the single motor during deceleration of the vehicle; an assist determination device for determining whether it is necessary for the single motor to assist the engine output in response to a driving condition of the vehicle; wherein said control apparatus of the hybrid vehicle comprises: a start of travel detecting device for detecting the start of travel of the vehicle; a state of charge detecting device for detecting only the initial state of charge of said battery device at the time of starting the travel; a discharge depth detecting device for detecting a charge amount and a discharge amount including a discharge depth value of the present state of charge from the initial state of charge detected at the time of starting the travel; a lower limit threshold value setting device for setting the lower limit threshold value of the discharge amount based on said initial state of charge; an upper limit threshold value setting device for setting the upper limit threshold value of the discharge amount based on said initial state of charge; a mode setting device for changing a control mode of said single motor to a discharge limiting motor control mode when the discharge depth value of the battery device is reduced to said lower limit threshold value; a mode setting release device for releasing the setting of the discharge limiting control mode set by said mode setting device after the charge amount of the battery device reaches said upper limit threshold value from the lower limit threshold value; a determination threshold value correction device for correcting the determination threshold value used as the standard for determination by said assist determination device in response to said discharge depth detecting device when the control mode of the single motor is changed by said mode setting device; and a determination threshold value discharge depth value correction device for further correcting the determination threshold value corrected by said determination threshold value correction device in response to said initial state of charge of said battery device; wherein the state of charge of the battery device is determined based on the initial state of charge, the charge amount, and discharge amount including the discharge depth value.