Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1978-09-19
1981-03-24
Hickey, Robert J.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 43, 340636, H02J 700
Patent
active
042583063
ABSTRACT:
An indicator circuit for indicating to the operator of an electrically propelled vehicle the remaining capacity of the vehicle battery. The state of charge information is indicated in digital form for facilitated readout. The circuit is arranged to prevent an increase in the indicated state of charge during use of the battery as a power source, i.e. in a motoring mode. The circuit is arranged to prevent a decrease in the indication of the state of charge during a recharging of the battery. The circuit utilizes a feedback signal from the digital counter portion thereof for comparison with a second signal produced in the control circuit to provide either a count-up signal to the digital counter or a count-down signal to the digital counter in providing the control of the operator indicator. The feedback signal may be converted to an analogue signal for comparison with the produced circuit signal in a comparator to provide the appropriate count-up or count-down signal. A fast count control may be provided for bringing the indicator quickly to the actual state of charge reading upon initiating use of the vehicle in the motoring mode. The circuit is arranged to prevent the indicator from reading out less than zero percent state of charge when the battery is being used as the power source and more than one hundred percent state of charge during the recharging operation.
REFERENCES:
patent: 3568175 (1971-03-01), Schwehr et al.
patent: 3939421 (1976-02-01), Barringer et al.
patent: 3946299 (1976-03-01), Christianson et al.
patent: 4017724 (1977-04-01), Finger
patent: 4019112 (1977-04-01), Satoh
Bourke Robert F.
Johansen David K.
Gould Inc.
Hickey Robert J.
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