Patent ID: 6927552

Claim:
A control apparatus for an on-vehicle electricity storage device, which is installed in a vehicle having an internal combustion engine as a power source, a motor capable of electrical power generation, and an electricity storage device, the control apparatus comprising: an electrical power consumption measuring device for measuring electrical power being consumed in the vehicle; a charge control device for controlling the electricity storage device depending on the consumed electrical power measured by the electrical power consumption measuring device so that the electricity storage device is placed in and out of a charging mode in which electrical energy, which is converted from output power of the internal combustion engine or from a portion of a kinetic energy of the vehicle using the motor, is charged into the electricity storage device; an inter-terminal voltage measuring device for measuring the inter-terminal voltage of the electricity storage device; a voltage sustain time measuring device for measuring a sustain time which begins when the electricity storage device is placed out of the charging mode by the charge control device, and during which the inter-terminal voltage measured by the inter-terminal voltage measuring device remains equal to or greater than a predetermined value; and a non-charge sustain time setting device for setting a non-charge sustain time, during which the electricity storage device is kept out of the charging mode, depending on the sustain time measured by the voltage sustain time measuring device.