Methods and systems for egr system
AssigneeFord Global Technologies, LLC
InventorsJose Francisco Martinez Leyva, Sumanth Reddy Dadam, Patrick Edward Smithberger, Adam Krach, Edward Doemer
Life of this patent
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Abstract
Methods and systems are provided for EGR valve diagnostic. In one example, a method includes providing a correction to a position of the EGR valve to compensate for an altitude of the vehicle. The compensation is based on a comparison of a pressure ratio to a curve rationalized with a barometric pressure.
Claims20
A method of altitude compensation of a delta pressure over valve (DPOV) exhaust gas recirculation (EGR) system, comprising:
- adjusting a valve controlling flow through the EGR system by providing a correction to a position of the EGR valve based on a pressure ratio normalized to a manifold air pressure (MAP) and a barometric pressure (BP).
A system, comprising:
- a delta pressure over valve (DPOV) exhaust gas recirculation (EGR) system comprising a first pressure sensor arranged upstream of an EGR valve and a second pressure sensor arranged downstream of the EGR valve relative to a direction of exhaust gas flow;
- and
- a controller with computer-readable instructions stored on memory thereof that when executed cause the controller to:
- sense a current pressure ratio based on a current exhaust gas pressure (EXP) and a current EGR pressure (EGRP);
- and
- compare the current pressure ratio to an error threshold range based on a curve, wherein the curve represents a relationship of a ratio of EXP:EGRP normalized to a manifold air pressure (MAP)/a barometric pressure (BP);
- and
- provide a correction to a position of the EGR valve at a given altitude in response to the current pressure ratio being outside the error threshold range.
A method for a delta pressure over valve (DPOV) exhaust gas recirculation (EGR) system comprising a first pressure sensor arranged upstream of an EGR valve and a second pressure sensor arranged downstream of the EGR valve relative to a direction of exhaust gas flow, the method, comprising:
- generating a curve based on a normalization of a ratio of exhaust gas pressure (EXP):
- EGR pressure (EGRP) to a manifold air pressure (MAP)/a barometric pressure (BP);
- comparing a current ratio of EXP:EGRP to the curve at a current altitude;
- and
- providing a correction to a position of the EGR valve in response to the current ratio being outside an error threshold range of the curve.
Dependencies are inferred from the claim text.