Electricity: motive power systems – Battery-fed motor systems
Patent
1983-09-30
1992-04-21
Ro, Bentsu
Electricity: motive power systems
Battery-fed motor systems
320 43, 320 48, H02J 700
Patent
active
051071916
ABSTRACT:
A microprocessor based electric vehicle traction battery monitoring system evaluates the state of charge, interfaces with a traction motor control system, and controls recharging. The state of charge is evaluated during the first part of discharge by integrating the current after compensating it for rate of discharge and during the last part of discharge by dividing the battery into sub-packs and evaluating the state of charge from the lowest sub-pack voltage compensated for polarization voltage. The charge storage capacity is also calculated from the lowest sub-pack voltage. The maximum traction motor current is progressively limited during the last part of discharge. During charging, the charge withdrawn is replaced while progressively reducing the charging current and the battery is then charged at a constant current until the rate of rise of the lowest sub-pack voltage falls below a fixed level.
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patent: 4008423 (1976-12-01), Christianson et al.
patent: 4012681 (1977-03-01), Finger et al.
patent: 4210855 (1980-07-01), Harer et al.
Adams Derek S.
Arlidge Neville J.
Lowndes Michael W.
Lucas Industries Ltd.
Ro Bentsu
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