PURPOSE: To prevent warning from being given for a long time immediately after an ignition switch is turned ON, without delaying the alarm generation when a trouble is generated.
CONSTITUTION: The coil 3a of a relay 3 for selecting the supply of electric power to an alarm lamp 2A and an alarm buzzer 2B is connected with an ignition switch through a relay control circuit 4, and the relay controller circuit 4 is constituted by connecting a pressure switch 5A and a timer 6A in a series relation and connecting a pressure switch 5B and a timer 6B in a series relation, in a parallel relation. The set pressure of one pressure switch 5A is slightly higher than the sealing pressure in an accumulator connected with a hydraulic booster, and the set pressure of the other pressure switch 5B is higher than the set pressure of the pressure switch 5A and lower than the operation pressure range of the hydraulic booster, and the timer 6A is put into a cut-off state after the lapse of a prescribed time from the turning-ON of the ignition switch 1.
KOBAYASHI HIROSHI
KIMURA TETSUO
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