Method and device for calibrating an exhaust gas sensor
AssigneeMan Truck & Bus AG
InventorAndreas Doering
Life of this patent
Estimating the term…
Abstract
A method for calibrating an exhaust gas sensor arranged in a measurement chamber, includes providing a measurement chamber in or adjacent to an exhaust channel of an internal combustion engine. At the start of a calibration phase, exhaust gas present in the measurement chamber is displaced by a filling of the measurement chamber with calibration gas, and at the end of the calibration phase, exhaust gas diffuses into and/or is introduced into the measurement chamber.
Claims16
A method for calibrating an exhaust gas sensor, wherein the exhaust gas sensor is arranged in a measurement chamber in an exhaust channel of an internal combustion engine, the measurement chamber including two perforated cylinders arranged concentrically one inside the other, at least one of the two perforated cylinders being movable about a longitudinal axis thereof so that the two cylinders form a screening device with a variable screening effect, the two perforated cylinders each have at least two bores in cylinder walls of the two perforated cylinders, wherein the two perforated cylinders are movable from a non-aligned position into an aligned position to open the measurement chamber to inflowing exhaust gas, the method comprising:
- displacing, at a start of a calibration phase, exhaust gas present in the measurement chamber by filling the measurement chamber with a calibration gas;
- and
- introducing exhaust gas into the measurement chamber at an end of the calibration phase by moving the two perforated cylinders into the aligned position.
A device for calibrating an exhaust gas sensor, comprising:
- a measurement chamber in which the exhaust gas sensor is arranged, the measurement chamber being arranged in an exhaust channel of an internal combustion engine, the measurement chamber including two perforated cylinders arranged concentrically one inside the other, at least one of the two perforated cylinders is movable about its longitudinal axis so that the two cylinders form a screening device selectively screening the measurement chamber from an exhaust gas flow in the exhaust channel;
- and
- a gas pipe connected to the measurement chamber for exposing the measurement chamber to a calibration gas.
Dependencies are inferred from the claim text.