Robert Boschgmbh

Patric Kahles

Stefan Koch

Norbert Knab

Holger Pruessel

Volker Lurk

Karlheinz Lunghard

Johannes Heib

Chris Cummaudo

A fan system includes: two circuit breakers, a control module for controlling two circuit breakers, two electric motors to which their operating voltage Uis supplied via the circuit breakers, and at least one temperature sensor on a board on which the circuit breakers are located. The control module evaluates a signal Tfrom the temperature sensor, and sets the pulse duty factors TV, TVof pulsed control voltages at the circuit breakers, while taking into account this signal as well as a requested fan power, in such a way that no power loss Pexceeding a specified value occurs at any circuit breaker.

Fan system having improved availability and method for its operation

The invention relates to a method for monitoring and controlling reversing actions in electrically actuatable units, wherein an actuating drive unit can exert an actuating force in order to move an electrically actuatable unit, and a safety circuit automatically switches off the actuating drive unit after a jamming switch-off time that is predetermined for a movement if no movement occurs despite the triggering of the actuating drive unit. According to the invention, a triggered reversing action results in a temporary extension of the predetermined jamming switch-off time from a short jamming switch-off time tthat is predetermined for normal operation to a longer jamming switch-off time t().

Method for monitoring the reversing process of electrically actuatable units

The invention is based on a method for determining the remaining running time of an electric drive mechanism until a mechanical limit stop has been reached, wherein surfaces to be closed are moved into mechanically limited end positions by means of the drive mechanism. After the position of the surface to be closed is detected relative to a mechanical limit stop, the time difference between two incremental pulse generators near the limit stop is determined, and the remaining running time of the electric drive mechanism until the mechanical limit stop is reached is calculated.

Method for determining the remaining running time a drive runs

The method for detecting after-running of electrical servomotors with incremental position detection, particularly for servomotors in motor vehicles, includes detecting position signals of position indicators and storing the detected states of the position signals or the states of the position indicators after switching off the motor in a nonvolatile memory. The evaluation electronics can be intermittently disconnected from the supply voltage. They are provided with a buffer that is large enough for position detection and storage after disconnection of the evaluation electronics from the supply voltage. The nonvolatile memory can be an EEPROM in the microcontroller of the evaluation electronics.

Method of detecting after-running of electrical servomotors provided with means for incremental position detection

An arrangement and method for the electronic monitoring of an adjustment drive wherein two criteria must be met before a jamming safety responds. The one criterium takes into account the curve for the rotational speed of the actual and a preceding operation of the adjustment drive while a first and/or second derivative of measured value for the adjustment drive are incorporated into the second criterium.

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Buehl, Germany

Patric Kahles