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US 2022/0178319 A1Published application
Methods and systems for an exhaust gas recirculation system
AssigneeFord Global Technologies, LLC
InventorsDave Hagner, Sumanth Dadam, Sitaram Rejeti, Edward Doemer, Robert Jentz, Patrick Edward Smithberger
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Abstract
Methods and systems are provided for a high-pressure exhaust gas recirculation system. In one example, the high-pressure exhaust gas recirculation system comprises pressure seconds arranged on different sides of a valve. The pressure sensors are used to regulate exhaust-gas recirculate flow without a fixed orifice delta pressure sensor.
Claims20
A system, comprising:
- a high-pressure exhaust gas recirculation (HP-EGR) system comprising a first sensor upstream of a valve and a second sensor downstream of the valve relative to a direction of exhaust gas flow, wherein the HP-EGR system is free of a fixed orifice delta pressure sensor, and further comprising a controller with computer-readable instructions stored on non-transitory memory thereof that when executed enable determination whether one or more of the sensors is degraded.
An engine system, comprising:
- a high-pressure exhaust gas recirculation (HP-EGR) system comprising an EGR valve arranged between a first sensor and a second sensor in a passage, wherein the passage is fluidly coupled to an intake system comprising a manifold absolute pressure (MAP) sensor;
- and
- a controller with computer-readable instructions stored on non-transitory thereof that when executed enable the controller to:
- compare feedback between the second sensor and the MAP sensor during conditions where the EGR valve is fully closed to determine if the second sensor is degraded;
- and
- determine if the first sensor is degraded in response to the second sensor not being degraded based on a ratio calculated via feedback from the first sensor and the second sensor.
3 more elements
A method for a high-pressure exhaust gas recirculation system free of a fixed orifice delta pressure sensor, the method, comprising:
- comparing, using a controller with computer-readable instructions stored on non-transitory memory thereof, feedback from a first sensor to a second sensor during conditions where a position of an exhaust gas recirculation valve is outside of a fully closed position;
- and
- comparing, using the controller with computer-readable instructions stored on non-transitory memory thereof, feedback from the second sensor to a manifold absolute pressure (MAP) sensor during conditions where the position of the exhaust gas recirculation valve is at the fully closed position.
Dependencies are inferred from the claim text.