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:
Jan. 30, 2007
Filed:
Feb. 13, 2004
Songping Yu, Troy, MI (US);
Paul A. Pietrzyk, Beverly Hills, MI (US);
Gary L. Danhoff, Redford, MI (US);
Songping Yu, Troy, MI (US);
Paul A. Pietrzyk, Beverly Hills, MI (US);
Gary L. Danhoff, Redford, MI (US);
Ford Global Technologies, LLC, Dearborn, MI (US);
Abstract
A method for detecting a malfunction in a manifold absolute pressure sensor used in an internal combustion engine. The method includes obtaining a plurality of samples from the manifold absolute pressure sensor. A plurality of samples is obtained from a mass airflow sensor for measuring air flow to the engine. A plurality of inferred manifold absolute pressures is estimated from the plurality of samples obtained from the mass airflow sensor. A linear functional relationship is determined between manifold absolute pressure and inferred absolute pressure from the obtained samples of the manifold pressure sensor and the estimated inferred manifold absolute pressures, such functional relationship having an offset term and a slope. A comparison is made between the determined offset term and the determined slope with a predetermined offset threshold and a predetermined slope threshold level, respectively.