A control circuit for a safety device for use in a vehicle, comprises another annexed device activated by a signal complement to the first control signal and by the same validation signal

摘要

The control circuit for a safety device comprising a gate (ET0), a supply circuit (C0) and a device (F0) controlled as a function of a validation signal (VAL) representative of the state of a first annexed device comprising a supply circuit (C1) and a device (F1), for example a motor, activated by a first control signal (COM1), also comprises a second annexed device comprising a gate (ET2), a supply circuit (C2), and a device (F2), which is activated by a control signal (/COM1) which is the complement of the first control signal (COM1), and the validation signal (VAL) fixed at a reference potential. The second annexed device is controlled as a function of a second control signal (COM2) combined with the complement signal (/COM1) by the gate (ET2). The second annexed device comprises a load of finite impedance controlled by the complement signal (/COM1) obtained by an inverter and delivers an energy (EN2) to the device (F2) as a function of the second control signal (COM2) provided by a central processing unit. The supply circuit (C2) comprises an interrupter (INT2) and a relay (R2) connected between the output of the supply circuit (C1) and the ground. The gate (ET0) combines the validation signal (VAL) and a control signal (COM0) provided by the central processing unit. The first controlled device (F1) is the thermal motor of a vehicle, the second controlled device (F2) is that of the interior equipment of a vehicle such as a window heater, a window lifter or an illumination device, and the third device (F0) is an electronic lock such as of the direction column of a vehicle. The supply circuit (C1) controls the thermal motor. A method (claimed) for controlling a safety device is implemented by the control circuit (claimed) and comprises the steps of activating the first annexed device by the control signal (COM1), activating the second annexed device by the complement signal (/COM1), and fixating the potential of the validation signal (VAL) to the reference potential when the second device is activated. A vehicle (claimed) without key comprises the control circuit or a circuit controlled by implementing the method.