Robert Boschgmbh

Jurgen Brauninger

Albrecht Sieber

Dieter Seher

Josef Wirz

Herbert Schramm

Alfred Sigl

Hardy Haas

Thomas Kuttner

Manfred W Meissner

Andreas Schlichenmaier

Jochen Schafer

Jurgen Wietelmann

Dieter Worner

Volker Kadelbach

Dieter Heck

Volker Schafer

Wolfgang Duhlmeyer

Ulrich Schwabe

Norbert Leibbrand

Wolfgang Flogel, Deceased

Hans Guttler

Frank Bedrna

Gunter Kettenacker

Rainer Rudolph

James Holmes

A system for controlling a positioning unit in a motor vehicle includes various control units that influence the positioning unit coupled thereto. A drive slip control and an automatic transmission control both supply a control signal. Yet another control signal is dependent upon a driver request signal. For a period of time, the control signal from the automatic transmission control takes precedence over the other control signals.

System for the open-loop control of a motor vehicle

Method of correcting the rotating speed of vehicle wheels sensed by

A process for storing data in a non-transient memory of a computer is proposed, whereby temporary memory cells are provided for the restoration of data lost due to switching off of the supply voltage. The temporary memory cells are sequentially loaded with the address, the data to be stored and various identification codes, so that the addressing and the data to be stored are safe guarded at all times. After switching off of the supply voltage an initialization routine is started, which tests the required memory cell content and, if necessary, loads them again.

Process for safeguarding transfer of data from a temporary part into a

The invention relates to a method and apparatus for limiting road speed in electrically controlled diesel engines. The output signal of the road-speed transducer or, if the road-speed transducer is defective, the output signal of the engine speed transducer is evaluated by means of pregiven thresholds. In the presence of a simultaneous clutch signal and a quantity signal which is less than a pregiven injection quantity a waiting time is made available in advance of the quantity reduction so that when the clutch is actuated, fuel can be metered when the clutch pedal is depressed or the vehicle can be started on a hill. No transmission signal is necessary for limiting road speed whereby manipulations on the road-speed limitation are prevented.

Method and apparatus for limiting road speed in a motor ehicle having an

All but one of the microcomputers in a multi-computer system are equipped with a rapid-access read-write memory and a fixed content nonvolatile read-only memory. Each of these read-only memories, however, stores a multiplicity of varieties of one or more sets of data, so that, in the case of a computer system for a motor vehicle engine, the same system can be used in any of a large number of vehicle models. One of the microcomputers of the system has a programmable memory which is programmed at the time of installation to designate the portions of the fixed memories that are to be utilized. When the system is turned on, the programmed memory designation number is stored in the read-write memory of all of the computers of the system, with the result that the designated portion of each fixed read-only memory is always referred to in any computer of the system. It is not important that, when the system is turned off, the memory content of the read-write memories is lost.

Multi-microcomputer system

In an automotive engine control microcomputer the frequency of interrupt programs initiated by a pulse from an engine speed tachogenerator is prevented from being excessive as a result of loose connections or other malfunctions or distrubances by blocking the access of tachogenerator pulses to the interrupt port of the microcomputer for a predetermined interval following a successful interrupt from that source. If another signal that would produce an interrupt from that source is received during that interval, a circumstance indicative of probable malfunction, the blocking of interrupts from that source is continued for another interval of the same length.

System for preventing excessive repetition of interrupt programs in a

Method for monitoring a tachometer signal

Emergency control device for a diesel internal combustion engine with

To permit connecting a display characterizing a malfunction, for example malfunction in an automotive vehicle, or another monitored apparatus, and a warning lamp to alert an operator that a malfunction is being indicated to a single connecting line (SL), a coded representation characterizing the malfunction in the form of short pulses (I; 1, 2) is transmitted on the same line, with pulses which are so short that the response inertia of the warning lamp does not perceptively change its brightness (or darkness) level, as controlled by the operating voltage of the warning lamp between a high and a low value. The coded pulse representation is decoded in a microprocessor (MP) and displayed on a display (A) forming part of an evaluation device, coupled to the same single communication line (SL) which may be a single wire with chassis or ground return, or a two-wire connection. Typically, the warning lamp may operate in one to several second intervals (for example flashing), the pulses having pulse duration in the millisecond or fractional millisecond range. The pulses, when the warning signal lamp voltage level is 'high' then are formed by 'low' value pulses, and, if the lamp is dark, so that the operating signal is 'low', the pulses are 'high' and of insufficient duration to cause lighting of the lamp filament.

Method and system for indicating and display information in response to

A method of safeguarding operation of an internal combustion engine is based on the provision of two electrically controlled fuel supply pumps delivering fuel from a tank to a fuel metering device. During the start of the engine both fuel supplying pumps are activated. During a normal engine operation when rotary speed exceeds an iling value, a random fuel supplying pump is turned off. In a defect situation resulting from malfunction of the active pump both pumps are turned on to maintain fuel supply by the other pump. In an emergency situation when for example actual rotary speed exceeds a maximum value, both fuel supplying pumps are activated in reverse to suck fuel from the metering device and cause the standstill of the engine.

Method of and device for safeguarding operation of an internal

To reduce the transmission requirement of transmitting data between brake controlled microprocessors (7, 8, 9; 20-25) and a reference microprocessor, or reference microprocessor section (15) within one of the wheel speed microprocessors, the microprocessors are connected in a ring connection, or ring bus (13; 26, 27). The microprocessors generate, in each processing cycle, a code number based on the then pertaining operating conditions of the wheel or axle with which the respective microprocessor is associated. A code number determines one of several slopes for changing the reference signal. The code numbers are applied to the ring connection and thus to the reference microprocessor, where they are compared with stored code numbers, in which the stored code numbers are arranged in a predetermined priority sequence. Dependant on this comparison, a new reference signal is then generated which is transmitted to the microprocessors over the ring connection or ring bus for use as a reference value in calculating possible positive or negative slip of an associated wheel or the wheels of an associated axle. The system is particularly simple to check since transmitted code numbers, being recirculated in the ring connection, can be compared with previously transmitted code numbers.

Method and system to obtain a reference signal for a brake controlling

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Stuttgart, Germany

Jurgen Brauninger