Daimler Chrysler Ag

Daimler-benz Ag

Alf Blessing

Josef Berger

Peter Hille

Rainer M&auml;ckel

Rainer Maeckel

Roland Mauser

Horst Brinkmeyer

Manfred Stege

Rainer Mackel

Wilfried Miller

Hans-Peter Sch&ouml;ner

Udo Fried

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 control device for the drive motor of a windscreen wiper device in a vehicle, especially a motor vehicle, comprising a control switch which can be activated by means of a manually actuated wiper switch and which automatically controls the drive motor in a switching stage of said wiper switch according to a rain sensor signal corresponding to a characteristic curve. The operating data for the drive motor varies according to the external effects of lighting, temperature, or speed parameters.

Control device for a windscreen wiper device

A wiper rest heater is connected to a sensor. The sensor, when temperatures are low, directly or indirectly measures whether or not the windshield wiper can be moved when the wiper motor is switched on, without thereby damaging the wiper blade element or the motor. As a function of this, the wiper rest heater is then either switched on or off by an intelligent control.

Intelligent wiper rest heater

Process for monitoring the residual charge and the capacity of a battery, where at least two voltage-current measurements have been carried out on the load-carrying battery. The current load of the battery selected here should be greater than 30% of the nominal capacity per hour, e.g. for a 100 Ah battery, at least 30 amperes. The initial voltage-current measurement is taken at an initial time for an initial load condition of the battery. A second voltage-current measurement is carried out at a second time for a second load condition of the battery. It is essential here that the load condition of the battery has changed because of the current that has been drawn. The current-voltage measurements produce an initial measuring point and a second measuring point. The two measuring points set an interpolation line and determine the point of intersection with a limiting voltage level (U,). This point of intersection is marked by a so-called limiting current (I,). The limiting voltage level is decided from the minimum voltage required by the connected consumers in order for them to operate fault-free. The limiting voltage level is therefore stipulated for the technical layout of the battery system and is known. Furthermore, fault-free operation of the connected consumers requires a minimum operating current (I,), which is also specified and known as a design parameter of the battery system. The difference between the determined limiting current I,and the minimum operating current I,is determined and recorded. This difference is a dimension for the residual charge of the battery that is still available and in accordance with the invention is here designated as the limiting current reserve.

Process for monitoring the residual charge and capacity of a battery

The invention relates to a circuit for protecting consumers from damage caused by polarity reversal in an electrical system, comprising a limiter and a tripping device, wherein the system voltage supply is limited when polarity is reversed and the voltage source connected with reversed polarity can be disconnected.

Circuit for the protection of electrical devices

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

A battery monitoring unit is provided with a semiconductor power switch, which is looped into the battery lead and can serve for interrupting the battery current in a controlled manner. The battery monitoring unit comprises a sense FET circuit arrangement, which determines the battery current bidirectionally and the power FET part of which forms the semiconductor power switch, which is looped into the battery lead. Aside from the controllable interruption of battery current, a bidirectional determination of battery current and, with that, a continuous monitoring of the charge state of the battery is possible with this circuit arrangement, and can be used for monitoring vehicle batteries.

Battery monitoring unit having a sense FET circuit arrangement

A controllable semiconductor switching device having integrated overload protection of a load current path, including a switching section in the load current path and a multiplicity of main switching cells acting in parallel and having load-side terminals and non-load-side terminals including control terminals. The control terminals of the main switching cells are directly connected in a highly conducting manner among one another. A multiplicity of auxiliary switching cells are provided which carry a part of a total load current in parallel with the main switching cells in order to achieve an overload protection, and having load-side terminals and non-load-side terminals. The number of auxiliary switching cells are less than the number of main switching cells. The main switching cells and the auxiliary switching cells form the switching section. The load-side terminals of the main and auxiliary switching cells are directly connected in a highly conducting manner among and to one another, as are the non-load-side switching terminals. A second semiconductor switch has a switching section connected between the non-load-side switching terminals of the main switching cells. An element for measuring chip temperature is coupled to act on the second semiconductor switch with increasing chip temperature for turning the second semiconductor switch on. The element is disposed in the vicinity of the auxiliary switching cells at a periphery of a chip area covered by the main switching cells. At least one of the construction and a control variable of the auxiliary switching cells respectively differs from at least one of the construction and a control variable of the main switching cells in a manner such that specific current loading and specific power loss development of the auxiliary switching cells is essentially equally as great as that of the main switching cells with switching drive of the device and a load current below the overload limit. The specific current loading and the specific power loss development of the auxiliary switching cells increasingly exceeds monotonically that of the main switching cells with switching drive of the device and constant load current increase up to the overload limit.

Growing community of inventors

Heiningen, Germany

Alf Blessing