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Apparatus-for-diagnosing-low-voltage-battery

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Apparatus for diagnosing low voltage battery

Details

Inventors: Terauchi, Kenji;
Assignee: Nissan Motor Co., Ltd. (Yokohama, JP)
Primary Examiner: Wong; Peter S.
Assistant Examiner: Law; Patrick B.
Attorney, Agent or Firm: Foley & Lardner

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.

DETAILED DESCRIPTION The object of the present invention is to provide an apparatus capable of diagnosing and detecting degradation of a low voltage battery at starting.
According to the invention, the above object is achieved by providing an apparatus for diagnosing a low voltage battery, comprising: a high voltage battery for powering an electric automobile; a voltage reducing means for reducing the output of the high voltage battery to a low voltage; a low voltage battery for powering the auxiliaries of the automobile, the low voltage battery being connected to said high voltage battery by way of the voltage reducing means; a resistor means to be connected to the low voltage battery; a current/voltage sensing means for detecting the electric current and the voltage of the low voltage battery and resistor means; a battery diagnosing means for diagnosing the low voltage battery at the start of operation by referring to the output of the current/voltage sensor and a set of selected predetermined reference values for diagnosis; a battery switching means for interrupting the connection between the high voltage battery and the low voltage battery for the battery diagnosing means to diagnose; and a warning means operating according to the result of operation of the battery diagnosing means.
With an apparatus for diagnosing a low voltage battery according to the invention, the battery switching means interrupts the connection between the high voltage battery and the low voltage battery when the apparatus starts operating.
Under this condition, the current and the voltage detected by the current/voltage sensor shows a constant relationship because of the resistor means connected to the low voltage battery.
Thus, the state of the low voltage battery can be diagnosed at the very start of the operation of the automobile by means of the apparatus for diagnosing a low voltage battery according to the invention on the basis of the above relationship and a set of predetermined and stored reference values

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