Battery residual capacity measuring system and battery residual capacity measuring for electric vehicles
First Claim
1. A battery residual capacity measuring system for electric vehicles, the system comprising:
- first means for detecting a discharge current of a battery to provide a first data;
second means for detecting a discharge voltage of the battery to provide a second data;
third means for processing the first and the second data and a third data on a reference current to estimate a first value representative of a residual capacity of the battery under a first condition;
fourth means for processing the first data to provide a second value representative of a discharge quantity of the battery; and
fifth means for subtracting the second value from the first value to provide a third value representative of the residual capacity of the battery under a second condition higher in load than the first condition.
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Accused Products
Abstract
In each time slot, along with processing collected sets of amperage data and voltage data and a data on a reference current to provide a first value as an estimated residual capacity for a normal travelling, the amperage data are processed to provide a second value representative of a discharge quantity, and the second value is subtracted from the first value to provide a third value as a residual capacity for a high load condition, permitting the first value to be displayed in the normal travelling and the third value to be displayed under the high load condition, as this condition is detected by checking a significance of correlation in dispersion of the collected sets of data.
18 Citations
10 Claims
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1. A battery residual capacity measuring system for electric vehicles, the system comprising:
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first means for detecting a discharge current of a battery to provide a first data; second means for detecting a discharge voltage of the battery to provide a second data; third means for processing the first and the second data and a third data on a reference current to estimate a first value representative of a residual capacity of the battery under a first condition; fourth means for processing the first data to provide a second value representative of a discharge quantity of the battery; and fifth means for subtracting the second value from the first value to provide a third value representative of the residual capacity of the battery under a second condition higher in load than the first condition. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A battery residual capacity measuring method for electric vehicles, the method comprising the steps of:
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detecting a discharge current of a battery to provide a first data; detecting a discharge voltage of the battery to provide a second data; processing the first and the second data and a third data on a reference current to estimate a first value representative of a residual capacity of the battery under a first condition; processing the first data to provide a second value representative of a discharge quantity of the battery; and subtracting the second value from the first value to provide a third value representative of the residual capacity of the battery under a second condition higher in load than the first condition. - View Dependent Claims (9, 10)
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Specification