Siemens Aktiengesellschaft

Continental Automotive Gmbh

Vitesco Technologies Gmbh

Johannes Beer

Hong Zhang

Roland Herfurth

Stephan Bolz

Erwin Achleitner

Achim Koch

Harry Schüle

Bertrand Varoquie

Josef Kainz

Milos Tichy

Lamproula Charmpa

Alexander Artinger

A method for detecting a cylinder-specific combustion profile parameter value for an internal combustion engine is described. The method includes the following: (a) detecting a toothed encoder signal, (b) determining a cylinder-specific tooth time interval on the basis of the toothed encoder signal, (c) determining a cylinder-specific phase value on the basis of a Fourier transformation of a part of the toothed encoder signal corresponding to the cylinder-specific tooth time interval, (d) determining the combustion profile parameter value on the basis of the cylinder-specific phase value and a stored transfer function which represents a relationship between the combustion profile parameter and the phase value.

Detecting cylinder-specific combustion profile parameter values for an internal combustion engine

A method for determining an effective injection time of a valve having a coil drive includes determining an opening time of the valve, determining a closing time of the valve, and determining the effective injection time of the electric actuation of the valve for an injection operation based on the defined opening time and the defined closing time.

Electric actuation of a valve based on knowledge of the closing point and opening point of the valve

A method for determining a fuel pressure present at a direct injection valve comprising a solenoid drive comprises (a) detecting a voltage induced in the solenoid drive within a time span comprising a closing point in time of the direct injection valve, and (b) determining the fuel pressure based on the detected induced voltage. Further, a corresponding device, a common rail system, a motor vehicle, and a computer program for determining the fuel pressure of a valve comprising a solenoid drive are provided.

Method and device for determining a fuel pressure present at a direct injection valve

A method for determining a closing time of a valve having a coil drive, in particular a direct injection valve for an engine of a motor vehicle, has the steps: (a) switching off a current flow through a coil (L_inj) of the coil drive, so that the coil (L_inj) is depowered, (b) capturing a time curve () of a voltage induced in the non-powered coil (L_inj), wherein the induced voltage is generated by decaying eddy currents in a magnetic circuit of the coil drive and by a motion of the armature relative to the coil (L_inj), (c) evaluating the captured time curve () of the voltage induced in the coil (L_inj), and (d) determining the closing time based on the evaluated time curve (). A corresponding device and a computer program for determining the closing time of a valve with a coil drive can be provided accordingly.

Determining the closing time of a fuel injection valve based on evaluating the actuation voltage

A method is provided for determining a time duration for an electric actuation of a valve which has a coil drive, in particular of a direct-injection valve for an internal combustion engine. The method may include a deactivation of a current flow through a coil of the coil drive, such that the coil is in a currentless state, a detection of a time profile of a voltage induced in the currentless coil, a determination of the closing time of the valve on the basis of the detected time profile, and a determination of a time duration of the electric actuation of the valve for a future injection process on the basis of the determined closing time. A corresponding device and a computer program for carrying out the described method are also disclosed.

Electric actuation of a valve based on knowledge of the closing time of the valve

An internal combustion engine has at least one injection valve for delivering fluid, which has an electromagnetic actuator. A final stage unit is designed for creating a current profile for triggering the electromagnetic actuator with at least one given profile parameter (PP). Upon achieving magnetic saturation of a magnetic circuit of the electromagnetic actuator an assigned saturation current (I_sat_mes) is determined and at least one profile parameter (PP) is adjusted depending on the saturation current (I_sat_mes) thus determined and a given reference saturation current.

Method and device of operating an internal combustion engine

In a control unit and a method for operating a hybrid drive arrangement () with an internal combustion engine (), an electric drive () and a coupling device () that is arranged therebetween, when the internal combustion engine () and the electric drive () should be coupled together, the rotational speed of the internal combustion engine () is pilot-controlled to a target rotational speed level (N) such that the drive shafts () of the internal combustion engine () and the electric drive () run at least approximately synchronously. The pilot-control takes place by the throttle valve. Subsequently, the rotational speed of the internal combustion engine () is controlled in such a manner that the drive shafts () of the internal combustion engine () and the electric drive () run essentially synchronously. Then, the drive shafts () are joined by the coupling device ().

Method and control device for operating a hybrid drive

An internal combustion engine has a plurality of cylinders that have been allocated in at least two groups to one exhaust gas tract each. In each exhaust gas tract, an exhaust gas catalytic converter and an exhaust gas probe are fitted upstream of the exhaust gas catalytic converter. In order to detect combustion misfires in a combustion chamber of one of the cylinders, the following steps are carried out in each case. A combustion misfire is detected in one of the cylinders and allocated to one of the groups of the cylinders depending on at least one operating variable of the internal combustion engine.

Method and device for detecting a combustion misfire

Disclosed is a method, according to which the air fed to the combustion chambers of an internal combustion engine is pre-compressed by means of a boosting device, particularly an exhaust gas turbocharger. The valve overlap of the gas exchange valves of the internal combustion engine is adjusted by variably displacing the camshaft. The quantity of fuel to be injected, which is required for homogeneously operating the internal combustion engine, is determined and injected directly into the combustion chambers of the internal combustion engine, the total quantity of fuel to be injected being divided into two partial quantities. A first partial quantity is injected into the intake stroke while a second partial quantity is injected into the compression stroke. The ratio at which the two partial quantities are divided is defined according to the load range of the internal combustion engine.

Method for controlling an internal combustion engine operating with direct fuel injection

The invention relates to a method for controlling an injection of an internal combustion engine. The invention provides that after the internal combustion engine is started, the injection and/or the ignition is carried out according to a signal of an absolute position sensor device, particularly according to an absolute position sensor of a camshaft or according to an absolute position sensor of a crankshaft and to an angular range sensor. When a synchronization signal is detected by a sensor wheel of the crankshaft, the following control processes are carried out according to the synchronization signal, i.e. according to the position of the crankshaft. The inventive method is advantageous in that immediately after the internal combustion engine is started, a relatively precise signal for controlling the injection and/or the ignition is available. This enables a more precise combustion shortly after the internal combustion engine is started.

Method for controlling a direct injection of an internal combustion engine

The invention relates to the heating of an exhaust gas catalyst arranged on an internal combustion engine with direct fuel injection, variable valve drive and a blower device, whereby, after recognition of a cold start for the internal combustion engine, by means of a device, the valve lift (VH) and the valve overlap (VO) for the gas exchange valves and the position of a throttle valve, arranged in the inlet tract of the internal combustion engine are adjusted to give a positive pressure drop between the inlet side and the exhaust side of the internal combustion engine such that at least a part of the air pumped by the blower device is pumped directly from the inlet to the outlet side of the internal combustion engine into the exhaust line as flushing air. Optimal reaction conditions are thus obtained in the exhaust gas catalyst.

Method for heating an exhaust gas catalyst for an internal combustion engine operating with direct fuel injection

This invention relates to a method for increasing the reproducibility of the start-up in the start-stop operation of an internal combustion engine of a motor vehicle with start optimization. The reproducibility of the start-up is increased by reducing a maximum speed gradient that can be achieved for different stop positions of the internal combustion engine to a set speed gradient.

Method for increasing the reproducibility of the start-up during start-stop operation of an internal combustion engine

To check a three-way catalytic converter, a NOx sensor is used to determine the NOx concentration downstream of the catalytic converter that is to be diagnosed. On account of the close relationship between a NOx conversion and a HC conversion, the measured NOx concentration can be used to determine the HC conversion properties of the three-way catalytic converter.

Method for checking a three-way exhaust catalytic converter of an internal-combustion engine

To monitor an exhaust-gas catalytic converter when the internal combustion engine is at its operating temperature, an NOx sensor is used to determine the NOx concentration downstream of the exhaust-gas catalytic converter which is to be diagnosed. During the diagnosis time, the oxygen loading of the exhaust-gas catalytic converter is increased, and the conversion ability of the exhaust-gas catalytic converter is worked out from the NOx concentration which is measured during a plurality of lambda controller oscillations.

Method for monitoring and exhaust-gas catalytic converter of an internal combustion engine

A method for monitoring a catalytic converter includes ascertaining a measured variable at the catalytic converter and comparing it with a comparison value. The comparison value is ascertained in accordance with a model that uses at least one parameter of a comparison catalytic converter. The parameter of the comparison catalytic converter is adapted on the basis of a measured variable of the catalytic converter to be monitored.

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Wuppertal, Germany

Johannes Beer