Siemens Aktiengesellschaft

Other

Willibald Schuerz

Bertrand Lemire

Maximilian Engl

Johann Froehlich

Florian Tisch

Method for determining a functioning parameter of an engine

A method of determining a mass of fuel to be introduced into a suction pipe or into a cylinder of an internal combustion engine precontrols a basic injection time constituting a basic injection quantity, through a prescription of a lambda set point. The lambda set point is determined by a coordinated calculation through selecting a minimum and a maximum from a multiplicity of different lambda requirements which are derived from operating states of the internal combustion engine. Different priorities are allocated to the various lambda requirements.

Method of determining the mass of fuel to be introduced into the suction

An exhaust gas sensor has first and second sensor elements. Exhaust gas surroundings of the first sensor element are catalytically activated, so that an oxygen partial pressure which is in equilibrium will always be measured by the first sensor element, regardless of the conversion capability of a catalytic converter. The exhaust gas surroundings of the second sensor element are separate from the exhaust gas surroundings of the first sensor element, so that the exhaust gas surroundings of the second sensor element are not catalytically active. As a function of the conversion capability of the catalytic converter, the second sensor element measures either an equilibrium oxygen partial pressure or a free oxygen partial pressure, which are of different magnitudes. A malfunction of the catalytic converter is detected by comparing measurement signals of the first and second sensor elements.

Exhaust gas sensor and circuit configuration for the exhaust gas sensor

A method for parametrizing a lambda controller of a lambda control device having a lambda sensor supplying an output signal at least partially exhibiting a linear dependency on an oxygen content in exhaust gas of an internal combustion engine, includes representing a transfer function of a lambda controlled system by a series connection of first and second first order delay elements and an idle time element in a lambda control loop. The first delay element contains a response behavior of the lambda sensor and the second delay element contains a sliding averaging of measured lambda values.

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Aufhausen, Germany

Willibald Schuerz