| 摘要 |
An electronic stealing impediment device for cars, having the task to guard the car against any unauthorized use and any penetration of a thief, in which case an alarm signal is effected. The logical circuit of the equipment is connected to switches of the doors, and to the starter-switch. Should the logical circuit get voltage from any of said switches, so after a delay time of 8 sec. the memory will controll a timing circuit, which in turn controls the switching circuit. The output of the switching circuit blocks the starter switch and a magnet valve being placed into the fuel pipe-line of the engine - and controls the horn additionally. If said timing period is over, the horn signal stops, but being the memory not in its ground position in case of a repeated door opening or start-step, a repeated alarm and blocking is getting effective. Should the thief during the alarm-time not switch off the starter and should he start the motor after said period has passed the motor will start. If the rotation number of the motor achieves a predetermined value,so this fact will be sensed by a frequency sensing circuit being connected with the breaking contact of the motor, so the timing circuit gets a control signal, thereby effecting the alarm and blocking steps again. The replacing step if the device into the ground position with closed doors and with switched off starter, a sensing means - being placed secretly into the car can be excited e.g. a reed relay, generated by a permanent magnet, and the starter should be switched on again. The owner of the car has adequate time having the doors of the car opened, resp. starting the motor to get the sensing means uneffective by its excitation. |
