Continental Automotive Gmbh

Siemens Aktiengesellschaft

Carl-Eike Hofmeister

Michael Käsbauer

Matthias Stampfer

Martin Prenninger

Shahid Afsar Malik

A method and a device for identifying errors in emission-relevant control devices of a vehicle, such as the injection of fuel into a cylinder, allows error identification even if none of the sub-systems exceeds a predetermined threshold value. The method has the following steps: determining whether at least one parameter, which permits conclusions to be drawn about the emission behavior of the respective control device, lies in a desired range; if the parameter lies outside said desired range, an error value that correlates to an increase in emissions is stored; if the parameter is in the desired range, an error value of zero is stored; a total error value is formed from all error values of the control device and an error message is output if the total error value exceeds a predetermined threshold value.

Method and device for identifying errors in emission-relevant control devices in a vehicle

In a fault analysis method for an internal combustion engine having a plurality of cylinders, an angular speed of the internal combustion engine is determined, and one parameter of the combustion process of one of the plurality of cylinders () is adapted in order to equalize the times taken by the internal combustion engine to cover in each case one angle interval. To provide a fault analysis method which makes it possible to detect a defective cylinder (), it is determined that one of the plurality of cylinders () is defective on the basis of the value of the parameter.

Fault analysis method and fault analysis device for an internal combustion engine

In a method for testing a pressure sensor of a fuel accumulator device in an internal combustion engine, the pressure in the fuel accumulator device is altered using a first actuating variable. The influence of that alteration on the torque generated by the internal combustion engine is determined by a closed loop control system adjusting a second actuating variable to counteract the effect of the first on the torque output by the internal combustion engine. A deviation of the measured alteration from the expected alteration is then calculated.

Method for testing a pressure sensor of a fuel accumulator device

In order to locate errors of the rail pressure sensor () when starting problems occur, the following method steps are proposed: determination of whether starting problems occur in the engine and if this is the case, an engine state is induced, in which the engine controller is already active but the starting phase of the engine has not yet commenced; substitution of the measured rail pressure sensor value used by the engine controller with a substitute value; start attempt of the engine and determination whether the engine has achieved an independent operation; and identification of an error function of the rail pressure sensor if the starting problems only occur when the measured rail pressure sensor value is used.

Method for identifying an error function and in particular a drift of a rail pressure sensor in a common rail injection system

A method and system for adapting the operation of emission-relevant control devices of a vehicle in a predetermined driving mode having a shorter expected duration that a duration of a preferred test cycle may include several steps. A first step may include determining whether the vehicle has reached the predetermined driving mode. A second step may include diagnosing at least one parameter associated with operation of at least one of the emission-relevant control devices. A third step may include comparing the at least one parameter with a setpoint range or a setpoint value. A fourth step may include carrying out at least a first section of an adaptation for the operation of the at least one emission-relevant control devices. The first section of the adaptation may include optimizing at least one of a plurality of operating points of the at least one emission-relevant control devices.

Method and device for carrying out an adaptation and a diagnosis of emission-relevant control devices in a vehicle

During the operation of an internal combustion engine, a check is made whether the engine functions in an error-free manner in relation to the engine noise. If not, a current value of a cylinder-specific fuel quantity in a cylinder is determined. A check is made whether a current injected cylinder-specific fuel quantity in one of the cylinders is too low or high to check with respect to a cylinder-specific motor speed N_CYL, by comparing a current value of the cylinder-specific injection quantity in the relevant cylinder with a stored reference value of the cylinder-specific injection quantity of the relevant cylinder at the current operating point. A check with respect to the cylinder-specific motor speeds of one of the cylinders is deactivated, if the current injected cylinder-specific fuel quantity in the relevant cylinder is too low or high to check the relevant cylinder with respect to the cylinder-specific motor speed N_CYL.

Method and device for operating an internal combustion engine

A method for monitoring the operability of injection system of an internal combustion engine is described whereby, if the quantity of fuel injected changes, a malfunction source is detected according to the behavior of the pressure obtaining in the high-pressure accumulator. An appropriate emergency control program is executed by the control unit depending on the malfunction source detected. The method describes enables a malfunction source to be simply and accurately analyzed.

Method for monitoring the operability of a fuel injection system

In control systems () for internal combustion engines () in motor vehicles it is known that fault diagnoses are carried out to ensure the functional reliability of the internal combustion engine () or the motor vehicle even in the event of a fault. If a fault symptom () occurs, the cause of the fault is determined and a diagnosis manager () is used as a rule to deactivate the defective control system () completely or to initiate an emergency operation function. It is proposed that all information relating to fault symptoms should be listed, the actual cause should be determined by comparison with stored fault profiles and as a result only the smallest possible restriction of the functions of the relevant control systems () should be initiated. This has the advantage that the control system () can as a rule continue to be operated despite their restricted functional scope.

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Wuppertal, Germany

Carl-Eike Hofmeister