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US 9,804,073 B2Granted
Gas sensor
AssigneeRobert Bosch GmbH
InventorsMarc Brueck, Christopher Holzknecht, Martin Eckardt, Markus Linck-Lescanne, Simon Rentschler, Karsten Storbeck, Thomas Brummel, Martin Schaaf, Christian Schuppler
Life of this patent
Estimating the term…
Abstract
Gas sensors are provided that are fashioned such that there is an increased flow over the sensor element. In this way, a good measurement dynamic is achieved even when these gas sensors are exposed to exhaust gases having a low flow speed.
Claims8
A gas sensor for determining at least one state variable of a measurement gas, comprising:
- a housing;
- a sensor element installed in the housing and including a gas-sensitive end segment that protrudes from the housing and is exposed to a flow of measurement gas;
- a protective tube module that covers the end segment and is fastened on the housing;
- an inner protective tube that is cap-shaped and that surrounds the end segment with a radial and axial spacing, the inner protective tube including a cap floor, a cap opening, and a cap brim;
- a pot-shaped outer protective tube that surrounds the inner protective tube with a radial spacing, the outer protective tube including a pot floor and a pot sheath that are set back relative to the cap floor, and the outer protective tube including an inward bulge to reduce a volume between the inner protective tube and the outer protective tube at a location of the inward bulge;
- and
- an arrangement, disposed in the protective tube module, for allowing the measurement gas to pass through, the arrangement having a gas outlet present in the cap floor of the inner protective tube and gas inlets present in the outer protective tube and in the inner protective tube, at least one gas inlet in the inner protective tube being placed in the cap brim, and an open space being present, in a direction of flow of the measurement gas behind the cap brim, that extends under the cap opening in order to divert the measurement gas flow into the inner protective tube, wherein the gas inlet present in the outer protective tube is situated in the inward bulge of the outer protective tube.
4 more elements
A gas sensor for determining at least one state variable of a measurement gas, comprising:
- a housing;
- a sensor element installed in the housing and having a gas-sensitive end segment that protrudes from the housing and is exposed to a measurement gas flow;
- a protective tube module that covers the end segment and is fastened on the housing, the module having a cap-shaped inner protective tube that surrounds the end segment with a radial and axial spacing, the inner protective tube having a cap floor and cap sheath;
- a pot-shaped outer protective tube that surrounds the inner protective tube with a radial spacing, the outer protective tube having a pot floor and a pot sheath that are set back relative to the cap floor, and the outer protective tube including an inward bulge to reduce a volume between the inner protective tube and the outer protective tube at a location of the inward bulge;
- and
- an arrangement, provided in the protective tube module for the passage through of measurement the gas, the arrangement having a gas outlet present in the cap floor of the inner protective tube and gas inlets present in the inner protective tube and in the outer protective tube, wherein the gas inlet in the inner protective tube is fashioned in the cap sheath, and wherein the gas inlet present in the outer protective tube is situated in the inward bulge of the outer protective tube.
3 more elements
Dependencies are inferred from the claim text.