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:
Jun. 26, 2012
Filed:
Jan. 26, 2009
William Stewart Johnston, South Lyon, MI (US);
David Alan Wong, Southfield, MI (US);
Hugh Hamilton, Troy, MI (US);
Manfred Koberstein, Troy, MI (US);
Debasish Dhar, Canton, MI (US);
William Stewart Johnston, South Lyon, MI (US);
David Alan Wong, Southfield, MI (US);
Hugh Hamilton, Troy, MI (US);
Manfred Koberstein, Troy, MI (US);
Debasish Dhar, Canton, MI (US);
Ford Global Technologies, LLC, Dearborn, MI (US);
Abstract
A method and system for detecting a low charge condition in an air conditioner for a vehicle. The system first determines whether noise factors are present that would interfere with reliably measuring a pressure delta. If noise factors are not present, the system determines a pressure delta value for the compressor by comparing the high side pressure when the clutch is engaged to a high side pressure when the clutch is disengaged. If the pressure delta value is less than a threshold value, a low charge condition may be recorded. When the number of low charge conditions detected exceeds a predetermined number of events, the system may set a temperature diagnostic trouble code, disable the air conditioning system and alert the driver of a potential problem.