摘要:
An ignition device for an internal combustion engine includes an ignition coil designed as a transformer, the secondary winding thereof being designed to connect to a spark plug, an actuatable switch element connected in series with the primary winding of the ignition coil, and a controller connected to the primary winding of the ignition coil and the control input of the switching element. The controller has a voltage converter which provides a supply voltage for the ignition coil at the output thereof and which can be connected to a motor vehicle electrical system voltage, a controllable changeover switch for applying the supply voltage at either positive or negative polarity to the series circuit of the primary winding of the ignition coil and the switching element, depending on a control signal, and a control circuit which generates the control signal based on a phase of the ignition process.
摘要:
A method is provided for operating an ignition device for an internal combustion engine, which ignition device includes an ignition coil configured as a transformer, a spark plug connected to the secondary winding of the ignition coil, an actuable switching element connected in series to the primary winding of the ignition coil, and a control unit connected to the control input of the switching element, wherein the control unit provides an adjustable supply voltage for the ignition coil and an actuating signal for the switching element as a function of the currents through the primary and the secondary windings of the ignition coil and the voltage between the connecting point of the primary winding of the ignition coil to the switching element and the negative terminal of the supply voltage, as a result of which firstly operation of the spark plug by way of alternating current is possible and secondly regulation of said current is possible, which leads to more reliable ignition with a lower wear of the spark plugs.
摘要:
A circuit arrangement for operating at least one inductive load, for example a solenoid of a fuel injection valve, is configured to feed back electrical energy into a storage capacitor in a freewheeling phase after driving the load. In order to avoid an unwanted voltage increase on the capacitor, the circuit arrangement includes a DC/DC converter with the output-side storage capacitor to provide an operating voltage for the load. A drivable circuit arrangement optionally connects the load to the capacitor, and a freewheeling diode arrangement feeds back electrical energy into the capacitor after the circuit arrangement has been switched off. A protection circuit, which is connected in parallel with the capacitor, provides a current path for limiting the charging voltage on the capacitor in the event of an excessively high voltage on the capacitor.
摘要:
A current source contains a first switching element which is provided with a control input and is embodied and arranged in such a way that an output flow on an output side of a current source can be adjusted according to a control signal at the control input. The current source also contains a reference resistance that is electrically coupled to a first switching element in such a way that a potential difference above the reference resistance represents the output flow. The adjustment signal of a regulator unit depends on the voltage difference above the reference resistance, is the control signal of the first switching element, and contains a time function element which limits a first value of the output flow to a maximum duration and then reduces the value of the output flow.