US 9,810,171 B2
Method for determining an offset of a manifold pressure sensor
Rommel Racelis, Ann Arbor, MI (US); John Eric Rollinger, Sterling Heights, MI (US); and Robert Roy Jentz, Westland, MI (US)
Assigned to Ford Global Technologies, LLC, Dearborn, MI (US)
Filed by Ford Global Technologies, LLC, Dearborn, MI (US)
Filed on Dec. 3, 2013, as Appl. No. 14/95,908.
Prior Publication US 2015/0152802 A1, Jun. 4, 2015
Int. Cl. F02D 41/24 (2006.01); F02D 41/22 (2006.01)
CPC F02D 41/2474 (2013.01) [F02D 41/222 (2013.01); F02D 2200/0406 (2013.01); F02D 2200/0408 (2013.01); F02D 2200/704 (2013.01); Y02T 10/40 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for an engine, comprising:
during engine operation where the engine is at least spinning,
measuring manifold pressure at a first throttle angle;
determining a barometric pressure at a second throttle angle;
indicating degradation of a manifold pressure sensor based on a sensor offset, the sensor offset determined by equating a first ratio between the manifold pressure and a reference manifold pressure determined at the first throttle angle and at a reference barometric pressure, and a second ratio between the barometric pressure and the reference barometric pressure, the indicating including notifying an operator; and
adjusting engine operation based on the sensor offset.