The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 02, 2003
Filed:
May. 18, 2001
Paul R. Miller, Columbus, IN (US);
Cummins, Inc., Columbus, IN (US);
Abstract
A temperature compensation system for minimizing sensor offset variations includes an engine controller having stored therein a model of sensor operating behavior over temperature. In one embodiment, the sensor is a &Dgr;P sensor for sensing a differential pressure across a flow restriction mechanism disposed between an exhaust manifold and an intake manifold of an internal combustion engine. In this embodiment, the &Dgr;P sensor is preferably thermally coupled to a structural component of the engine whose operating temperature is readily discernable; e.g., the engine cooling system. Alternatively, the &Dgr;P sensor may include a temperature sensor coupled thereto. In either case, the engine controller is preferably responsive to transitions of the key switch to gather “hot” and “cold” temperature data under zero &Dgr;P conditions. This information is then used to constantly update the &Dgr;P sensor model.