Siemens Aktiengesellschaft

Continental Automotive Gmbh

Vdo Adolf Schindling Ag

Mannesmann Vdo Ag

Siemens Vdo Automotive Ag

Michael Henninger

Wolfgang Bay

Reinhold Berberich

Sven Kretschmar

Patrick Fischer

A method for operating an electronic device that is supplied with electric power by a continuous energy accumulator. A predetermined ending of the first program is monitored in a program step by a second program. If the first program is not switched off as predetermined, the second program generates an error message which is displayed immediately when the device is switched on again.

Method for operating an electronic device

The invention relates to a method and to an arrangement for monitoring signals which are guided to a multi-phase motor by an end stage and the pulse width thereof is controlled by a controller. The total of the pulse widths of the signals of each phase is measured by, respectively, a counter, respectively for a predetermined program flow in the controller. The meter reading is read by a counter according to a predetermined period of time and an error signal is produced if the total amount of time exceeds a predetermined tolerance range.

Method and arrangement for monitoring signals

The invention concerns a device for controlling a final power-output stage, the latter comprising three half-bridges consisting respectively of a series circuit including an upper semiconductor switch and a lower semiconductor switch and subjected to a service voltage, the connection points of the semiconductor switches of the half-bridges forming outputs which are connected to the windings of a motor having at least three phases. The invention is characterized in that there is provided a control device for shifting on-state respectively one semiconductor switch or simultaneously several semiconductor switches according to a predetermined programme and for determining whether the respective voltages at the outputs are respectively within a predetermined tolerance range for the corresponding switching state.

Arrangement for testing a power output stage

An arrangement for testing a power output stage, with the power output stage includes at least one half bridge with an upper semiconductor switch and a lower semiconductor switch connected in series and to which an operating voltage is applied. A junction point between the semiconductor switches of the at least one half bridge forms an output. A control device performs a test to determine whether the voltage at the output is within a predetermined central tolerance band when the semiconductor switches are not switched on, a test to determine whether the voltage at the output is within a predetermined upper tolerance band when the upper semiconductor switch is switched on, and a test to determine whether the voltage at the output is within a predetermined lower tolerance band when the lower semiconductor switch is switched on. The power output stage is identified as being sound when all of the output voltages are within the respective tolerance bands.

Method and arrangement for testing a power output stage

The invention relates to a method for controlling a safety-critical system, in particular of a motor vehicle, which includes a microcontroller. The microcontroller controls and/or regulates the operating sequences of the safety-critical system, and the microcontroller is composed of a microprocessor and at least one peripheral microprocessor device. In a method for controlling a safety-critical system in which disruption to the operational reliability is to be prevented by changes in the molecular movement of the carrier of the microprocessor, the chip temperature of a chip which is provided with the microprocessor and peripheral device together is measured during an operating sequence and/or program sequence and compared with a maximum permitted chip temperature of the microcontroller. The operating sequence and/or the program sequence is controlled as a function of the temperature comparison.

Method for controlling a safety-critical system which has a microcontroller

A method for monitoring a power output stage including at least one half bridge with upper and lower semiconductor switches connected in series, wherein the semiconductor switches are controllable alternately to a switched-on state and a switched-off state by pulse-width modulated pulses, includes measuring a first voltage across the lower semiconductor switch when the upper semiconductor switch is switched on and measuring a second voltage across the lower semiconductor switch when the lower semiconductor switch is switched on, comparing a difference between the operating voltage and the first voltage to a predetermined voltage and comparing the second voltage with the predetermined voltage, which is the maximum permissible voltage across a semiconductor switch when it is switched on, and determining that the power output stage or the output of the at least one half bridge is faulty when at least one of the difference and the second voltage is greater than the predetermined voltage.

Method for monitoring a power output stage

A device for driving an air-conditioning compressor having an electric motor, in particular for motor vehicles, having an arrangement for reducing the difference in pressure between the intake side and delivery side of the air-conditioning compressor during a starting phase of the electric motor.

Device for driving an air-conditioning compressor

A process and a system for controlling an electrohydraulic pressure supply for an auxiliary power device of an automotive vehicle in which a hydraulic pump system is operated by means of an electric motor the speed of rotation of which is controlled by operating parameters. In order to operate the auxiliary power system with the least possible energy, the changes in speed of rotation which differ from a predetermined desired speed of rotation of the electric motor are recognized and levelled out. In order to operate the power-assisted system with the least possible energy, the switching of the electric motor (2) from stand-by operation to full-load operation, or vice versa, takes place as a function of the speed of rotation (n) of the electric motor (2).

Growing community of inventors

Kelkheim, Germany

Michael Henninger