Robert Boschgmbh

Siemens Aktiengesellschaft

Uwe Kiencke

Alfred Schulz

Siegfried Dais

Wolfgang Botzenhardt

Martin Litschel

Gunter Honig

Martin Zechnall

Wolfgang Krampe

Ulrich Flaig

Werner Jundt

Helmut Espenschied

Karl Seeger

Gunther Honig

Georg Haubner

Manfred Mezger

Jurgen Wesemeyer

Winfried Klotzner

Werner Meier

Wolfgang Borst

Rudolf Nagel

Bernward Boning

Heinz Theuerkauf

Heinrich Knapp

Gregor Probst

Otto Karl

Karl Ott

Otto Glockler

Manfred Schwab

Hans Schrumpf

Ingo Gorille

Rolf Daumer

Ernst-Olav Pagel

Herbert Lohner

Theodor Gast

Rainer Bone

Frieder Heintz

Heinz Moller

Helmut Kauff

Wolfgang Bremer

Wolfram Glauert

Armin Daiss

Jan Unruh

Jorg Birmelin

Gunter Felger

Herbert Stocker

Guenther Honig

A method is disclosed for the operation of a data processing system for motor vehicles including at least two computers and a line connecting the computers for the transmission of messages. This line permits a fast and reliable data transmission between the computers installed in the motor vehicle, taking into account the specific requirements of a controller-coupling in the motor vehicle. An embodiment is provided which describes in detail the interface between the individual computers and the line linking the computers, and with the aid of which a controller-coupling is realized in the vehicle.

Method of processing messages to be transmitted for a data processing

The invention is directed to a method of handling erroneous messages in a data processing arrangement. The data processing arrangement can be applied to a motor vehicle and includes at least two stations such as a motor control computer, a transmission control computer, and/or a brake control computer. A data line connects the two stations for transmitting messages. The method is performed by causing the station which detected the erroneous message to transmit an error report in response to the erroneous message; and, causing the error report to include a sequence of states or bits which cannot be confused with any sequence of dominant states or bits during error-free data transmission.

Method of arbitrating access to a data bus and apparatus therefor

Method of building up messages for driving a data processing arrangement

A frictional value between a motor vehicle tire and a road surface is determined for use in an ABS system or a traction control system. Various sensors at the automobile ascertain the vehicle speed and the brake pressure at individual wheels. The angular acceleration of the wheel is calculated from the angular velocity thereof. A wheel slip is calculated from the vehicle speed and from the angular acceleration. The dependency of the coefficient of friction is approximated from the wheel slip with a non-linear approximation equation. The current estimation value for the coefficient of friction is estimated with a recursive estimation algorithm from measurement values previously ascertained during a preceding measuring instant.

Method and circuit configuration for determining a frictional value

A process for the localization of defective stations in local networks which consist of several locally distributedly operating stations is proposed, particularly for use in automobiles. The process is characterized by station-internal, statistical evaluation of external and/or internal error signals. The redundancy necessary for a self-monitoring of the stations interconnected by a serial bus need not be available locally in the respective station, rather only the redundancy existing in any case in a network due to the presence of protocol-compatible stations is utilized.

Process for the localization of defective stations in local networks and

Device for potential-free transmission of data

Method for operating a data processing system

Control signals for triggering the events to be controlled, via at least one output stage (13, 14), are generated in a vehicular computer (11) as a dependent function of the output signals of a sensor (10) coupled to a rotating shaft of the engine, and of further sensors dependent on other operating parameters. At least one sensor-controlled auxiliary control device (17, 18) is provided. The output signals of the auxiliary control devices (17, 18) are transmitted via a switching device (12) to the terminal control stages (13, 14) as an alternative to the output signals of the computer (11). The switching device (12) is preferably embodied as a multiplexer and is controllable by an error decoding stage (19) for decoding and monitoring serial, or parallel, signals of the computer (11) to determine proper function of the computer (11); in case of malfunction of the computer (11), decoding stage (19) causes control of the output stage, or stages (13, 14) from the respective auxiliary control device.

Apparatus for the control of repetitive events dependent on operating

A lambda regulating device is proposed for a fuel metering system in an internal combustion engine with externally supplied ignition. In addition to the regulation means which is already present, multiplicative and additive corrective variables are formed and are stored in non-transient memories. The regulating device enables an additive regulated shutoff of the additive lambda shift during idling and in the lower partial-load range, and it also enables regulation to a symmetrical distance on the part of the regulating manipulation from the limitation. The additive correction may be selected to be in accordance with rpm. Finally, the reference variables for the corrective value may be selected depending upon the air throughput in the intake tube of the engine. With a view to realization of the invention by means of a computer, individual flow diagrams relating to the mode of operation are given in the drawings.

Regulating device for a fuel metering system

The knock sensing equipment has a control circuit which generates gating signals for dividing the operation into a measuring phase and a test phase. In the latter, the possible malfunction of the sensor is determined. During the test phase, the sensor responds either to background noise or to a test voltage and the sensing output signals are compared to a predetermined minimum and/or maximum level. Malfunction is indicated if the signals furnished by the sensor are outside of the indicated range.

Knock sensing apparatus with fail indicator for use in an internal

A dwell angle control has three counting devices for detecting acceleration. In a first UP/DOWN counter (17), the count in one direction takes place throughout the time the current in the primary circuit of an ignition coil (25) exceeds a current threshold value (I1). The count in the other direction is constant with respect to time. The counts on the first counter are taken over into a second UP/DOWN counter (11) in response to the input signal, the counting direction also being determined by the input signals. When the count in the second counter (11) reaches an adjustable trigger threshold value, the closure time is initiated, the actual ignition time being fixed by an edge of a sensed signal, or the edge of the signal from an ignition computer. The adjustable trigger threshold value is advantageously determined by a third UP/DOWN counter (12) which is set to a fixed value (X) by an edge of the sensed signal and whose counting direction is also determined by the sensed signals. A very good dynamic response is achieved by the detection of acceleration by three counters during different time periods. It is advantageous to switch from a decrease in closure angle to an increase in closure angle at an adjustable speed by switching the adjustable trigger threshold value to a very small value and switching the counter (11) to a continuous DOWN count. This allows a matching to variable ON/OFF ratios of the sensed signal.

Dwell angle control for internal combustion engine ignition system

To positively allocate output signals from a transducer scanning marker elements arranged at a uniform distance from the center of a rotating disk, the markers are located around the circumference of the disk in accordance with a predetermined pattern, for example, uniformly distributed 30.degree. apart, or distributed with uniformly increasing relative distances, and an additional market element (33) and forming a reference marker is located in the zones between adjacent markers spaced from a neighboring marker element (21) of the plurality of marker elements by a distance which is substantially larger than the angular distance with respect to the marker element at the other side of the reference marker. The outputs from a pick-up sensor are evaluated by applying the outputs to two counters, counting a different clock rate, the count output of one of the counters being stored and compared with a subsequent count state of the other counter operating at a higher clock rate. If the second counter has not reached the previously stored count, a positive indication that the sense marker as the reference marker is obtained, permitting a comparator to switch over a transfer switch to route the sensor output to a line indicating that the marker was the reference marker; if the faster-counting counter has, however, reached the count state of a slower counter in the prior cycle, an indication is obtained that the marker is a regularly recurring one, thus permitting control of the transfer of the output from the sensor to a routing line indicating that the marker is a regularly recurring one. The count rates are preferably sufficiently different to accomodate expected variations in speed of rotation of the disk within the recurrence time between adjacent markers.

System and apparatus to determine the angular position, and speed of a

Clock pulses are counted to provide a count indicative of speed in a counter that is reset with every revolution of a reference mark. The difference between successive counts is multiplied by a fractional factor, which is not necessarily the same for acceleration and deceleration, then added algebraically to the current count value. The acceleration-corrected speed value is then multiplied by a parameter-dependent digital value obtained from a summing circuit to which various engine condition parameters are supplied and the output of the last-mentioned multiplier is supplied to a comparator to which the current count of clock pulses beginning with the reference mark passage is compared. When the comparator finds the match, spark ignition takes place. Another counter counts the clock pulses following each reference mark for sequencing multiplexers that enable some components to serve in more than one operation, in effect controlling the flow of digital values around various loops in the circuit.

Ignition system for internal combustion engines

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Ludwigsburg, Germany

Uwe Kiencke