Apparatus for diagnosing low voltage battery

Details Apparatus for diagnosing low voltage battery Apparatus for diagnosing low voltage battery

1996-06-06

1998-08-25

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 39, 320 48, H02J 700

Patent

active

057986290

ABSTRACT:
An apparatus for diagnosing a low voltage battery includes a high voltage battery for powering an electric automobile, a voltage converter that reduces the output of the high voltage battery to a low voltage, a low voltage battery for powering the auxiliaries of the automobile, a current/voltage sensor, a controller, and a warning indicator. The low voltage battery is connected to the high voltage battery through the voltage convertor and a resistor is connected to the low voltage battery. The current/voltage sensor detects electric currents and voltages of the low voltage battery and the resistor. The controller diagnoses the degradation of the low voltage battery at the start of operation of the automobile by referring the output of the current/voltage sensor to a set of selected predetermined reference values. A battery relay interrupts the connection between the high voltage battery and the low voltage battery to diagnose the low voltage battery and the warning indicator alerts to a degradation of the low voltage battery.

REFERENCES:
patent: 4990885 (1991-02-01), Irick et al.
patent: 5033565 (1991-07-01), Abukawa et al.
patent: 5334926 (1994-08-01), Imaizumi
patent: 5350994 (1994-09-01), Kinoshita et al.

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