Abstract: A method and a device for driving at least one solenoid valve used for controlling the injection of fuel into an internal combustion engine. At the start of the driving (activation), the solenoid valve is supplied with a booster voltage that is elevated as compared to that used for the further driving. The energy and/or power output received by the solenoid valve at the start of the driving is able to be influenced as a function of the operating state of the internal combustion engine.

Abstract: A vehicle security system with an anti-theft controller which conducts a data exchange with at least one function controller, particularly an engine controller, in order to control its operational readiness, wherein the data exchange is conducted via a data line connecting at least the anti-theft controller and the function controller. Alternatively, an external device (4) can be connected to the data line (1), with the device being configured for the exchange of data with at least one of the controllers (2, 3, 3', 3") The data line is a line which is already in existence in the vehicle, particularly a K-diagnostics line and/or an L-diagnostics line in accordance with ISO standard 9141. For the control of the data exchange, one of the controllers (2, 3) connected via the data line (1) exercises the functions of the control unit.

Abstract: A control circuit arrangement for controlling the after-running of an operating device in a motor vehicle is described, with which after shutting off the ignition the operating device is provided with voltage for a certain time interval by an associated voltage regulator and a switching means including a transistor. The shut off of the voltage provided to the operating device occurs by changing the input potential of the voltage regulator. Otherwise without the arrangement of the invention an external or internal relay is needed to switch off the voltage. In various embodiment the potential change at the control input of the voltage regulator can be controlled by electronic hardware devices or by a microprocessor under the control of software.

Abstract: An ignition system for internal combustion engines with a control unit for triggering at least one ignition final stage and means for suppressing a switch-on spark. A first embodiment of an ignition system in accordance with the present invention includes a voltage-controlled switch coupled to each output of the control unit for coupling the respective output to ground until the supply voltage ramps up to a value required for the operation of the control unit. A second embodiment of an ignition system in accordance with the present invention includes a voltage-controlled switch which is coupled to all outputs of the control unit, and which switches all outputs to ground until the supply voltage ramps up to a value required for the operation of the control unit.