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US 10,704,506 B2Granted
Methods and systems for EGR valve diagnostics
AssigneeFord Global Technologies, LLC
InventorsIan Halleron, Andres Arevalo, Jon Dixon, Oliver Gee, Sean Harman, Zoltan Szilagyi
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for an EGR valve diagnostic. In one example, a method may include actuating an EGR valve between first and second positions. The method may further includes determining one or more characteristics of the EGR valve during the diagnostic to determine if an EGR valve cleaning is desired.
Claims20
A method comprising:
- executing an EGR valve diagnostic following an engine deactivation to determine if an EGR valve cleaning is desired, wherein the EGR valve diagnostic calculates three or more of a breakaway value, a holding power value, a hang time value, a travel time value, and a travel speed value as an EGR valve is actuated from a resting position, to a predetermined position, and back to the resting position.
A system comprising:
- an engine comprising an exhaust-gas recirculation passage fluidly coupling an exhaust passage to an intake passage, wherein exhaust gas from the exhaust-gas recirculation passage to the intake passage is adjusted via an exhaust-gas recirculation valve;
- and
- a controller with computer-readable instructions stored on non-transitory memory thereof that when executed enable the controller to:
- execute an exhaust-gas recirculation valve diagnostic in response to an engine being deactivated, wherein
- the exhaust-gas recirculation valve diagnostic comprises setting a power supply to an actuator of the exhaust-gas recirculation valve to zero;
- increasing the power supply to the actuator of the exhaust-gas recirculation valve to actuate the exhaust-gas recirculation valve to a predetermined position;
- calculating a breakaway value equal to the power supply to actuate the exhaust-gas recirculation valve to the predetermined position, and where the breakaway value is stored in memory;
- holding the exhaust-gas recirculation valve at the predetermined position;
- calculating a holding value equal to a holding power supply used to hold the exhaust-gas recirculation valve in the predetermined position;
- decreasing the holding power supply to zero;
- measuring a hang time value equal to a time elapsed between decreasing the holding power supply to zero and the exhaust-gas recirculation valve moving out of the predetermined position;
- calculating a travel time of the exhaust-gas recirculation valve from the predetermined position to a resting position;
- and
- calculating a travel speed of the exhaust-gas recirculation valve from the predetermined position to the resting position.
11 more elements
A method comprising:
- actuating an EGR valve from a resting position to a predetermined position;
- calculating a breakaway power used to actuate the EGR valve from the resting position to the predetermined position;
- holding the EGR valve in the predetermined position;
- calculating a holding power used to hold the EGR valve in the predetermined position;
- and
- actuating the EGR valve from the predetermined position to the resting position;
- calculating a hang time for the EGR valve to move out of the predetermined position;
- calculating a travel time and a travel speed of the EGR valve from the predetermined position to the resting position;
- and
- signaling a cleaning operation in response to one or more of the breakaway power being greater than a threshold breakaway power, the holding power being greater than a threshold holding power, the hang time being greater than a threshold hang time, the travel time being greater than a threshold travel time, and the travel speed being less than a threshold travel speed.
7 more elements
Dependencies are inferred from the claim text.