Apparatus for monitoring battery residual capacity in mulitple modes
AssigneeYazaki Corporation
InventorsYouichi Arai, Tsutomu Saigo
Life of this patent
Estimating the term…
Abstract
When a car is moved, a current and a voltage from a battery change and a power-supply voltage of a sub-battery is not lower than a manipulation level, an approximately linear function is obtained according to a current from a buttery and a terminal voltage, and residual capacity is displayed according to the approximately linear function. When the car is stopped and the current and the voltage of the battery do not change, the residual capacity is obtained according to the voltage. Moreover, when a power source supplying control circuit judges that an ignition is turned off, a voltage of the power source is lowered to the manipulation level so as to be supplied for prescribed time required for the battery becoming constant.
Claims5
An apparatus for monitoring residual capacity of a battery, comprising:
- means for sensing a discharge current, which is supplied from a battery to a load side;
- means for sensing a terminal voltage of the battery;
- means for calculating residual capacity of the battery based on
- (1) the terminal voltage of the battery whenever the battery has not experienced a discharge for a time period longer than a time-out period, and
- (2) an approximately linear function of the terminal voltage and the discharge current whenever the battery is experiencing a discharge;
- a display section for displaying the residual capacity calculated by said calculating means;
- and
- a time-out circuit connected to the means for calculating for causing the last-calculated residual capacity to be retained for the time-out period after a discharge from the battery ceases.
Dependencies are inferred from the claim text.