Method of correcting the characteristic curve of a linear lambda probe
AssigneeSiemens Aktiengesellschaft
InventorHong Zhang
Life of this patent
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Abstract
In order to correct the characteristic of a linear lambda probe which is arranged in an emission control system of an internal combustion engine upstream of a catalytic converter, in an overrun fuel cut-off phase the throttle valve and/or at least one gas exchange valve of the internal combustion engine is opened, and the signal of the lambda probe is assigned to the lambda value corresponding to the oxygen concentration of the ambient air. It is then possible, together with a conventional trimming controller which corrects the assignment of the signal to lambda=1, to correct the gradient of the characteristic.
Claims10
A method of correcting a characteristic of a linear lambda probe arranged upstream of a catalytic converter in an emission control system of an internal combustion engine, which comprises:
- in an overrun fuel cut-off phase of the internal combustion engine:
- opening a valve to set a pressure in a cylinder of the internal combustion engine so as to exceed a predetermined pressure threshold;
- assigning a signal of the lambda probe to a lambda value corresponding to an oxygen concentration of ambient air;
- and
- correcting a gradient of the characteristic with the signal.
Dependencies are inferred from the claim text.