Robert Bosch

Beqir Pushkolli

Stefan Blind

Daniel Raichle

Gunther Goetting

Manfred Ackermann

Klaus Rechberger

Thomas Knorpp

Manfred Stahl

Michael Ruffer

Alexander Scheidle

Ulrich Klein

A device and a method for detecting a polarity reversal on a low voltage side of a DC voltage transformer in a dual-voltage vehicle electrical system, particularly in a motor vehicle. A current flow is enabled, in this instance, in a connecting line on the low voltage side of the DC voltage transformer by a controllable switching element, a current is detected in a connecting line on the low voltage side of the DC voltage transformer, with the aid of a current sensor system, the direction of the detected current is evaluated by an evaluation unit and a polarity reversal is detected if the direction of the detected current differs from an expected current direction.

Device and method for detecting a polarity reversal on a low voltage side of a DC voltage transformer in a dual-voltage vehicle electrical system

A method is provided for current-based detection of an electrical fault in an electrical network of a motor vehicle, the network having at least: one battery, one pulse-controlled inverter, one d.c. voltage converter, and an intermediate circuit associated with the pulse-controlled inverter. The method includes: detecting magnitudes of each a battery current, a d.c. voltage converter current, and an intermediate circuit current; comparing current magnitudes according to provided equations; and checking based on the comparison of whether a specifiable deviation has been exceeded. An alternative method for voltage-based detection of an electrical fault in an electrical network of a motor vehicle includes: detecting magnitudes of each a battery voltage, a d.c. voltage converter voltage, and an intermediate circuit voltage; comparing voltage magnitudes according to provided equations; and checking based on the comparison of whether a specifiable deviation has been exceeded.

Method for detecting an electrical fault in an electrical network of a motor vehicle

A method for operating an electrical network, in particular of a hybrid motor vehicle, the network having at least one electrical accumulator, in particular a high-voltage accumulator, at least one electric machine, and at least one inverter controlling the electric machine, the electrical accumulator being electrically disconnected from the network when a malfunction is detected and the inverter being switched to a short-circuit operating mode when a specifiable voltage limit of a network voltage of the network is subsequently exceeded. There is a provision for switching power semiconductors of the inverter in such a way that the driven electric machine induces a voltage and provides it via free-wheeling diodes on the electrical network and the induced voltage is used for operating the electric machine as a generator such that a specifiable network voltage is set by the electric machine.

Method for operating an electrical network, in particular of a motor vehicle

A method and a system for determining the rotor temperature of an electric motor of a hybrid vehicle. In a method for determining the rotor temperature of an electric motor of a hybrid vehicle in which it is possible to reliably determine the rotor temperature using simple means, the rotor temperature of the electric motor being ascertained by measuring an operating parameter of the electric motor during operation of the hybrid vehicle.

Method and system for determining the rotor temperature of an electric motor of a hybrid vehicle

A method for optimizing the starting torque and for reducing the electrical power usage of a starter-generator of an internal combustion engine. The starter-generator is configured as an electrical machine, which is operated using an inverter or an indirect a.c. converter the electrical power P being made available by a vehicle battery. Before the imaginary turning point ( ) on the torque curve ( ) of the starter-generator is reached, the phase current of the electrical machine is limited. The electrical machine is controlled from the point at which a limiting point ( ) is reached along the electrical limiting power curve ( ) (P&equals;const), such that the electrical power P corresponds to that at the stationary operating point ( ) of the electrical machine.

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Ludwigsburg, Germany

Beqir Pushkolli