An apparatus and technique for fluid level determination in automatic transmissions. The invention employs an electronic control unit in association with an automatic transmission for a vehicle, the electronic control unit receiving data corresponding to transmission oil level, transmission oil temperature, engine speed, transmission speed, and transmission selected range. Upon determining that such data satisfies certain diagnostic tests, the level of transmission fluid within the transmission is determined and adjusted or otherwise normalized to ideal test conditions. The electronic control unit compensates an oil level signal for deviations in oil temperature from an optimum test temperature, and makes further compensation for deviations in engine speed and settling time at the time that the test data is acquired. Additionally, variations in oil density as a function of oil temperature are also compensated.

Apparatus and method for fluid level determination in automatic transmissions

A window wiper system for an automotive vehicle provides multiplex encoding of a control switch signal and an additional wiper control signal in a two-channel multiplex control signal and decoding of the multiplex control signal by the wiper mechanism for control of wiper operation. The multiplex control signal is a cyclical waveform containing alternating cycles of different first and second periods wherein the duty cycle of the first period cycles is determined by the additional wiper control signal and the duty cycle of the second period cycles is determined by the control switch. The additional wiper control signal may be derived from a rain sensor, an intermittent delay control resistor or any other device on the passenger side of the vehicle firewall which generates a signal controlling wiper operation.

Multiplexed vehicle window wiper control

In a communication method for a single-wire databus for motor vehicles comprising a central station and peripheral units containing sensors, in which the central station sequentially addresses the peripheral units by means of voltage pulses and the peripheral units deliver a current signal to the databus, the peripheral units, in their transmitting operation, first deliver their address as a coded current signal and then a coded current information covering the entire range of values of the sensor at the same reference voltage as the address current signal to the databus and thus to the central station. This makes it possible to identify the peripheral unit transmitting in each case and, at the same time, to detect the various variable sensor values in a bi-directional data traffic on a single-wire databus.

Communication method for a single wire data bus for a motor vehicle.

Communication method for a single wire data bus for a motor vehicle

In a wiring system for vehicles, having a cable set with cables and/or cable harnesses with a fixed number of lines, which are laid in the vehicle, on whose ends detachable connections or transition points for the connection of assemblies or functional elements are provided, it is provided that a cable set is provided for a basic fitment by means of which a fixed number of basic functions can be carried out, and also for additional functions, in that lines are provided in the cable set for the basic fitment which lead to fixedly specified transition points between connectors ST and modules B in the vehicle and are provided essentially for directly connected circuits and which, on the installation of additional functional element are ready to be used as control or power supply lines of such a design that the power supply lines are overdimensioned for power transmission in such a manner that the maximum conceivable power requirement for additional assemblies or functional elements is ensured at the transition points, in that only lines of the basic fitment which are already in use are used, in essence, when lines are used as power supply lines or control lines, and that the control lines are already provided in the basic fitment as bus lines for information transmission, which permit a multiplication of the functions which can be carried out.

Wiring system for vehicles

The object of the present invention is an electrical system for distributing electrical power to the user devices installed on board of a motor vehicle, and, in particular, the wiring of the electrical system located in the area of the dashboard, which is realized as a subsystem of multiplex type, comprising three electronic microprocessor control units connected by a communication bus constituted by a serial interconnection line for the transmission of data.

Electrical system for a motor vehicle

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Electrical system for a motor vehicle