Method for determining an offset of a manifold pressure sensor
AssigneeFord Global Technologies, LLC
InventorsRommel Racelis, John Eric Rollinger, Robert Roy Jentz
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for determining an offset of a manifold pressure sensor. In one example, an engine method may include indicating degradation of the manifold pressure sensor based on a sensor offset, the sensor offset based on a manifold pressure measured at a first throttle angle, a barometric pressure at a second throttle angle, a reference manifold pressure at the first throttle angle and reference barometric pressure, and the reference barometric pressure. Further, the method may include adjusting an output of the manifold pressure sensor by the determined sensor offset.
Claims20
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.
An engine method, comprising:
- adjusting engine operation based on an adjusted manifold pressure, the adjusted manifold pressure based on an offset of a manifold pressure sensor, the offset determined while the engine is at least spinning by measuring manifold pressure at a first throttle angle, determining barometric pressure at a second throttle angle, and equating a first ratio between the manifold pressure and a reference manifold pressure, and a second ratio between the barometric pressure and a reference barometric pressure;
- and
- indicating degradation of the manifold pressure sensor by notifying an operator responsive to the offset being greater than an offset threshold.
A system, comprising:
- an intake manifold coupled to an engine;
- a throttle positioned in the intake manifold;
- a manifold pressure sensor positioned in the intake manifold and configured to determine a measured manifold pressure;
- and
- a controller with computer readable instructions for, during engine operation while the engine is at least spinning:
- measuring manifold pressure at a first throttle angle less than a threshold;
- estimating a barometric pressure at a second throttle angle greater than the first throttle angle;
- adjusting the measured manifold pressure by a manifold pressure sensor offset, the manifold pressure sensor offset determined by equating a first ratio between the measured manifold pressure and a reference manifold pressure and a second ratio between the estimated barometric pressure and a reference barometric pressure;
- and
- adjusting engine operation based on the adjusted manifold pressure.
Dependencies are inferred from the claim text.