CPC G07C 5/0808 (2013.01) [B60R 16/03 (2013.01); H02J 7/0063 (2013.01); B60R 16/0232 (2013.01)] | 12 Claims |
1. An electronic control device comprising a first power supply unit to which a battery voltage is always supplied as a power supply voltage,
wherein the first power supply unit includes:
a first timer that measures a key-off time period;
a diagnostic timer different from the first timer;
a first timer diagnosis unit that compares a timer value of the first timer with that of the diagnostic timer during the key-off time period;
a second power supply unit to which the battery voltage is supplied as a power supply voltage through a power relay controlled to be turned on or off by an ignition signal;
a start signal generation unit that generates a start signal for the second power supply unit based on a comparison result of the first timer diagnosis unit, wherein
the first power supply unit further includes:
a second timer for starting the second power supply unit after a predetermined key-off time period; and a second timer diagnosis unit that compares the second timer and the diagnostic timer during the key-off time period, and
the start signal generation unit generates a start signal for the second power supply unit based on diagnosis results of the first timer diagnosis unit and the second timer diagnosis unit; and
a first oscillator and a diagnostic oscillator on which time measurement is based,
wherein
the first timer and the second timer are connected in common to the first oscillator, and
the diagnostic timer is connected to the diagnostic oscillator.
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