Charge/float motor vehicle electrical system

Details Charge/float motor vehicle electrical system Charge/float motor vehicle electrical system

1980-05-27

1982-01-12

Hickey, Robert J.

Electricity: single generator systems

Automatic control of generator or driving means

Voltage of generator or circuit supplied

320 37, 320 64, 320 23, 322 73, H02J 714

Patent

active

043107931

ABSTRACT:
A motor vehicle electrical system having a charge mode of operation wherein the motor vehicle battery receives charging current at a temperature compensated voltage from an engine-driven generator, and a float mode operation wherein the battery charging current is reduced to a low value, sufficient only to prevent self-discharge of the battery. The charge and float modes of operation are alternately engaged as a function of the battery state of charge. During the charge mode of operation, a sufficiently high state of charge is detected as a function of the magnitude of the charging current, and during the float mode of operation, a depleted state of charge is detected as a function of the battery voltage. A timer provides a periodic return to the charge mode of operation to sample the battery state of charge.

REFERENCES:
patent: 1868046 (1932-07-01), Cole
patent: 2621316 (1952-12-01), Lamm et al.
patent: 3568031 (1971-03-01), Eberts
patent: 3585482 (1971-06-01), Zelina
patent: 3600661 (1971-08-01), Briggs et al.
patent: 3794905 (1974-02-01), Long
patent: 3895282 (1975-07-01), Foster et al.
patent: 3904948 (1975-09-01), Earle
patent: 4061956 (1977-12-01), Brown et al.
patent: 4128799 (1978-12-01), Morishima
patent: 4136311 (1979-01-01), Scheidler
patent: 4233553 (1980-11-01), Prince et al.
"Circuitry Senses Battery State, Adjusts Charge Voltage", Design News, Aug. 22, 1977, p. 57.

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