Daimler Chrysler Ag

Other

Rainer Maeckel

Alf Blessing

Josef Berger

Horst Brinkmeyer

Peter Hille

Thomas Schulz

Roland Mauser

Manfred Stege

Marcus Kneifel

Udo Fried

Wilfried Miller

A method for determining the buffering effect of the battery () for providing a voltage (U) for a power supply system (), in particular for a vehicle, is provided in order to identify serviceability of a battery as easily and reliably as possible, in which method any voltage change and any current change are detected cyclically, the dynamic internal resistance of the battery is determined on the basis of the quotient of the voltage change and the current change, the specific dynamic internal resistance is monitored for exceeding an extreme value which can be predetermined, and a statement of the buffering effect of the battery is made and is output. In this case, the buffering effect of the battery is better, the smaller the quotient of the voltage change and current change.

Method and system for determining the buffer action of a battery

A device for identification of an external start is fitted in a vehicle which has an electrical on-board power supply system ( ) fed with an on-board power supply system voltage of about 12.5 V via a vehicle battery ( ). A negative pole ( ) of the battery ( ) is connected to a vehicle earth ( ). A monitoring unit ( ) is arranged between a positive pole ( ) of the battery ( ) and the on-board power supply system ( ). A conventional voltage sensor ( ) for detection of the on-board power supply system voltage, a similarly conventional current sensor ( ) for detection of the current flowing out of the battery, and a conventional temperature sensor ( ) for detection of the operating temperature of the battery ( ) are provided in the monitoring unit ( ). The main measurement variable is the on-board power supply system voltage; the battery current and the battery temperature represent auxiliary measurement variables in a monitoring algorithm. Furthermore, the monitoring unit ( ) contains a microcontroller ( ), which can identify a change in the on-board power supply system load via a CAN bus ( ). As is indicated by the dashed line ( ), the on-board power supply system load can also be detected directly via a controllable switch ( ).

Method and apparatus for identification of an external power supply in a motor vehicle

The response time of a melting fuse is controlled or influenced by temporarily boosting a threshold level from a first constant value (I.sub.1) to a second dynamic value (I.sub.2) which is then caused to decay in a controlled manner during a fixed time between (t.sub.1) and (t.sub.2) and in accordance with a selectable decay function. If a current (m) flowing through the fuse exceeds the decaying threshold value a fuse blowing current is generated and supplied to the fuse, whereby the fuse blows sooner than it would have, if the excess current had prevailed for a long enough time between (t.sub.1) and (t.sub.X). On the other hand, the fuse does not blow in response to short duration transient excess currents that occur, for example at starting an engine. The engine start impulse which may be used to temporarily raise the threshold value from (I.sub.1) to (I.sub.2) and then cause said controlled decay.

Method and apparatus for triggering a fuse

A control device operates a window wiper in a motor vehicle, and includes a switching device for the selection of several wiping functions, a sensor device for determining a wetting degree of a window, and an electronic analyzing system. The window wiper is capable of being operated, depending on the wiping function selected by the user, in a continuous wiping operation and/or in a single wiping operation. The electronic analyzing system, during a first wiping function, analyzes the determined wetting degree of the window and, depending on the determined wetting degree of the window, in a continuous wiping operation, sets a wiping frequency and/or, in a single wiping operation, activates a wiping cycle for the window wiper. The electronic analyzing system sets the wiping frequency of the window wiper in the continuous wiping operation during a second wiping function within a second wiping frequency band, and during a third wiping function, within a third wiping frequency band, and during the first wiping function, within a first wiping frequency band, depending on the analysis of the wetting degree of the window, an actual wiping frequency being set which is as optimal as possible. If, during the switching between the wiping functions, a change of the wiping frequency band is required, the actual wiping frequency, during a change from the second wiping frequency band to the third wiping frequency band is increased by a defined number 'n' wiping cycles per minute or, during a change from the third wiping frequency band to the second wiping frequency band is reduced by a defined number 'm' wiping cycles per minute.

Control device for operating a window wiper in a motor vehicle

An overvoltage protective arrangement to protect an electrical installation against overvoltages, which installation has an onboard power supply system fed by an electrical D.C. generator (9) and electrical devices connected thereto. The overvoltage protective arrangement is provided with a limiting device whose threshold value is above the rated generator voltage.

Growing community of inventors

Koenigswinter, Germany

Rainer Maeckel