Robert Boschgmbh

Marcus Rosenberger

Rene Schenk

Martin Trunk

Karl-Otto Schmidt

Thomas Daub

Thomas Karamudas

The invention relates to an on-board electrical system supply system (), having a DC/DC converter () with at least one semiconductor rectifier element (), having two supply connections () for an on-board electrical system, which supply connections are connected at the output end to the DC/DC converter (), having an isolating switch () which is coupled between one of the supply connections () and the DC/DC converter (), and having an on-board electrical system isolating circuit () which is designed to determine a reverse voltage (U, Ua, Ub) across at least one of the semiconductor rectifier elements (), and to actuate the isolating switch (), in order to decouple the on-board electrical system from the DC/DC converter (), depending on a value of the determined reverse voltage (U, Ua, Ub).

On-board electrical system isolating circuit for DC/DC converters, and method for isolating an on-board electrical system from a DC/DC converter

The invention relates to a device and to a method for producing a signal having an adjustable pulse duty factor, in particular a pulse-width-modulated signal. For this purpose, the period duration of the pulse-width-modulated signal can be varied. Thus, the pulse duty factor of the pulse-width-modulated signal can be adapted very accurately to the desired pulse duty factor without great switching complexity by using a simple counter with a fixed clock frequency.

Device and method for providing a signal having an adjustable pulse duty factor

A method for operating an internal combustion engine () having multiple cylinders (); fuel may be injected into the multiple cylinders () via corresponding injectors, and air may be let in via corresponding intake valves () in order to form an air-fuel mixture in the cylinders () for providing a drive torque, and combustion exhaust gas may be discharged from the cylinders () via a catalytic converter (); having the following steps: operating the internal combustion engine () in a first engine operating mode in which no fuel is injected into at least one first cylinder (), so that the at least one first cylinder () does not contribute to the drive torque, and fuel is only injected into at least one second cylinder () in order to provide the drive torque; and switching to a second engine operating mode in which fuel is injected into the at least one first cylinder () and into the at least one second cylinder (), so that the at least one first cylinder () and the at least one second cylinder () contribute to providing the drive torque; wherein in switching to the second engine operating mode the combustion is carried out using excess air in the at least one second cylinder (), so that a portion of the air let into the at least one second cylinder (), together with the combustion exhaust gas, passes into the catalytic converter ().

Method and device for operating an internal combustion engine

A starting motor for an internal combustion engine, where a control circuit monitors or controls the temperature of the starting motor or the carbon brushes, and if necessary, limits or switches off the primary current. The temperature is indirectly determined by means of a comparison, using the voltage ripple in the primary circuit between the battery and the starting motor. Occurring errors can be stored as status messages in an error storage device, and if desired, they can be interrogated and corrected at the next service interval.

Starting motor for an internal combustion engine, having a safety device

The invention relates to a method for compensating for the measuring error in detecting current in an energy storing means ( ), in which the detecting current is effected via a first current converter ( ) and a second current converter ( ) for higher currents, and the converter values ( ), ( ) of the two current converters ( ), ( ) are converted in an electronic evaluation unit ( ) into measured values ( ). The measured values for the battery current I ( ) are measured with both current converters ( ), ( ) upon reaching a threshold ( ), and from this the offset ( ) of one current converter ( ) is determined and corrected by the measured values ( ).

Growing community of inventors

Schwieberdingen, Germany

Marcus Rosenberger