Back to results
US 12,116,961 B1Granted
Methods and systems for EGR system
AssigneeFord Global Technologies, LLC
InventorsEric Luehrsen, Sumanth Reddy Dadam, Edward Doemer, Gladys Galicia, Adam Krach
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for an exhaust gas recirculation (EGR) system. In one example, a method includes determining a present EGR valve offset and an historical EGR valve offset and comparing the present EGR valve offset and the historical EGR valve offset to determine a presence of an EGR leak.
Claims20
A method, comprising:
- calculating a historical exhaust gas recirculation (EGR) valve average offset based on data from previous drive cycles;
- sensing, via sensors of an engine control system, operating conditions during a current drive cycle;
- calculating a present valve average offset based on the operating conditions;
- comparing the present valve average offset to the historical EGR valve average offset;
- monitoring an EGR leak, wherein monitoring the EGR leak comprises determining the EGR leak is not present when the present valve average offset is less than or equal to the historical EGR valve average offset.
2 more elements
A system, comprising:
- an exhaust gas recirculation (EGR) system comprising an EGR valve upstream of an EGR cooler relative to a direction of EGR flow through the EGR system to an intake system, an exhaust gas sensor upstream of the EGR valve, and an EGR pressure (EGRP) sensor between the EGR valve and the EGR cooler;
- and
- a controller comprising computer-readable instructions stored on memory thereof that when executed enable the controller to:
- sense a plurality of EGR valve offsets during a plurality of drive cycles;
- determine an average historical EGR valve offset based on previous EGR valve offsets sensed during a plurality of previous drive cycles;
- determine a present EGR valve average offset during a present drive cycle;
- compare the present EGR valve average offset to the average historical EGR valve offset;
- determine an EGR leak in response to the present EGR valve average offset being greater than the average historical EGR valve offset in combination with an engine misfire being detected;
- and
- adjust engine operating parameters in response to the EGR leak being present.
7 more elements
A method for an exhaust gas recirculation (EGR) system, the method comprising:
- calculating an historical average offset of an EGR valve during a plurality of previous drive cycles, an offset based on a difference between a commanded position and an actual position of the EGR valve;
- determining a present average offset of the EGR valve during a present drive cycle;
- monitoring a presence of an engine misfire;
- indicating an EGR leak is present in response to the presence of the engine misfire in combination with the present average offset being greater than the historical average offset;
- and
- adjusting operating conditions in response to indicating the EGR leak is present.
3 more elements
Dependencies are inferred from the claim text.