Robert Boschgmbh

Achim Herzog

Thomas Raica

Bernd Bodig

Herman Roozenbeek

Bernd Eckert

Edwin Eberlein

Werner Hofmeister

Roland Schmid

Michael Schoenfeld

Peter Schiefer

Jie Ge

Falco Sengebusch

Andreas Koch

Rolf Litzinger

Ralf Schinzel

Klaus Hueser

Hans Seitel

Eberhard Spengler

Willy Betz

Traugot Degler

Uwe Wagner

J&uuml;rgen Spachmann

Albert Staake

A control circuit for controlling solenoid valves for fuel metering in an internal combustion engine (banks I and II) includes a recharge circuit having a throttle coil in series with a diode and with a storage capacitor, as well as an FET power transistor connected in parallel with the series circuit of the diode and the storage capacitor. The solenoid valves of the individual banks are switched off during the rapid extinguishing with a voltage produced by the recharge circuit. To minimize the influence of the supply voltage, which comprises a wide range, the HS-FET is switched off during the rapid extinguishing phases.

Control circuit for controlling at least one solenoid valve for fuel metering in an internal combustion engine

An electronic control unit having a housing, a substrate, particularly a hybrid, arranged in the housing and having an electronic control circuit. The electronic control unit also includes at least one device plug secured to the housing having contact elements that are electrically conductively connected to the control circuit of the substrate. A second substrate is arranged in the housing, spatially separated from the first substrate. At least one power component disposed in the housing and, electrically connected to the control circuit on the first substrate. One connecting printed circuit trace disposed in housing and conductively connected to the power component. The connecting printed circuit trace are conductively connected to a contact element, conducting power currents, of the device plug. Using the arrangement, in the event of a large number of contact elements in a device plug, the electrical connecting of the contact elements to the substrate can be simplified. Moreover, the printed circuit trace layout is simplified, an improvement in the EMC protection is achieved, and the dissipation of heat generated by the power component is improved.

Electronic control apparatus

Connector arrangement for an automotive steering system with a control

The safety device, especially in an electronic motor vehicle control system, protects external circuit branches supplied with current from an engine/motor vehicle control unit so that a single short circuit results in failure of only that circuit branch in which the short circuit is located, so that an emergency operation of the electronic motor vehicle control system is possible. The respective reference grounds of the external circuit branches are connected to a common ground conductor (11) via an interface (3) including respective reference ground connectors (d, k, m). Each reference ground connector includes a safety device in the form of thin wire plug bonds, whose maximum current load sets the maximum current load of the respective external circuit branches. Then, if there is a short circuit to the reference ground of the concerned external circuit branch to a main supply voltage, the remaining circuit branches remain unaffected and operational.

Safety device for linking reference grounds in an integrated circuit

The voltage developed by a primary winding of an ignition coil is supplied to a voltage divider for furnishing an analog signal of reduced amplitude for evaluation on an analog basis, which reduced amplitude analog signal is averaged by a capacitor connected between the voltage divider tap and ground. The capacitor eliminates the undesired effect of voltage spikes, but is not large enough to interfere with the measurement of voltages exceeding the ignition-initiating primary winding voltage value. The same reduced primary winding voltage is supplied through an input resistor to one input of a differential amplifier connected to operate as a switch having hysteresis and having a reference voltage applied to it such that the output will be the provision of a steady voltage having a duration corresponding to the spark discharge duration, for subsequent digital evaluation. The tap of the voltage divider that provides the analog output voltage for the system is subjected to a clamping action provided by another voltage divider of low ohm value connected across a 5-volt source and having its tap connected to the tap of the first mentioned voltage divider by a diode, so that primary winding voltages above the spark-initiating voltage will be measured on a reduced scale, while the differential amplifier and other integrated circuits are prevented from having overvoltages applied to them. The circuit is therefore suited for economical manufacture in so-called hybrid technology.

Circuit apparatus for measuring the primary voltage of an ignition coil

Growing community of inventors

Backnang, Germany

Achim Herzog