| 摘要 |
<p>PURPOSE:To issue alarm when a door is opened without pulling out the key, after the engine has been stopped, installing the key switch which is turned on when the steering is not locked. CONSTITUTION:A key switch 6 is turned on under the condition which the ignition key is inserted into the key slit, the negative pressure switch 7 is turned on under the condition which the negative pressure is zero after the engine is stopped, the door switch 8 is turned on under the condition which the door is opened, several switch 6-8 are turned off except all other conditions. When the door is opened without pulling out the key after the engine is stopped, every swtich 6-8 are turned on, the alarm 9 operates only for the period which the timer 10 is set. For this period, the transistor 11 is conducted, the relay 12 operates, the switch 12b is turned on, every switch 6-8 is short circuitted. Consequently the operation of the alarm 10 is maintained itself.</p> |
