Abstract: An electronic circuit has an electronic control unit, a safety control unit, and an electronic locking unit with a delay unit and with a memory unit. The electronic control unit can control an actuator via a normal-operation control signal in a specified manner. The safety control unit can generate a triggering signal for the electronic locking unit without the electronic control unit influencing generation of the triggering signal. The delay unit can receive the normal-operation control signal and to transmit it with a time delay to the memory unit. The memory unit can receive the triggering signal and store the normal-operation control signal with the time delay upon the memory unit receiving the triggering signal. The electronic locking unit can control the actuator based on the stored normal-operation control signal, upon the memory unit receiving the triggering signal and storing the signal transmitted with the time delay.

Abstract: A method is disclosed for controlling the brakes of a vehicle combination that includes a tractor vehicle and at least one trailer vehicle. A brake control valve in the tractor vehicle has magnetic switching valves that controlled by an electronic control unit, including an inlet valve and an outlet valve. To determine a current trailer status, it is determined whether the tractor vehicle is connected to a trailer vehicle and/or the line volume of the brake control line. A target pressure to be produced in the brake control line is specified and is produced by pulse-like opening of the inlet valve and/or the outlet valve. The brake control pressure in the brake control line is measured during the pressure build-up of pressure and a characteristic value for the trailer status and/or for the line volume of the brake control line is determined.

Abstract: A method is disclosed for controlling the brakes of a vehicle combination that includes a tractor vehicle and at least one trailer vehicle. A brake control valve in the tractor vehicle has magnetic switching valves that controlled by an electronic control unit, including an inlet valve and an outlet valve. To determine a current trailer status, it is determined whether the tractor vehicle is connected to a trailer vehicle and/or the line volume of the brake control line. A target pressure to be produced in the brake control line is specified and is produced by pulse-like opening of the inlet valve and/or the outlet valve. The brake control pressure in the brake control line is measured during the pressure build-up of pressure and a characteristic value for the trailer status and/or for the line volume of the brake control line is determined.