| 摘要 |
In a vehicle having an engine for generating power and a battery for supplying electricity to electrical devices, a system for preventing the battery 1 from excessively discharging comprises a switching unit 2 for opening/closing an electrical circuitry for supplying electricity from the battery 1 to electrical devices; an engine monitoring unit 3 for monitoring operation of the engine and for producing a signal corresponding to the state of engine operation; and a control unit 4 and 5 for controlling operation of the switching unit 2 according to the signal output from the engine monitoring unit 3, the control unit 4 and 5 having time delaying means so that the switching unit 2 opens the electrical circuitry after delaying for a given time from the time of engine stop. The engine monitoring unit 3 comprising a pickup coil L1 that emits a prescribed pulse signal upon being applied high voltage from an ignition coil during operation of the engine, and an amplifier OP1 that amplifies the pulse signal output from the pickup coil L1 and produces a continuous pulse train. The system may comprise a battery voltage monitoring unit 7, a manual switching unit 8, a discharge current monitoring unit 9 and a warning system 11 controlled by a warning system control unit 10.
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