Methods and systems for particulate filter sensor
AssigneeFord Global Technologies, LLC
InventorsAllen Lehmen, Adam Krach, William Goodwin, Sumanth Reddy Dadam
Life of this patent
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Abstract
Systems and methods for evaluating operation of a differential pressure sensor are disclosed. In one example, the differential pressure sensor may be configured to sense a pressure drop across a particulate filter. An operational assessment of the differential pressure sensor may determine whether or not a reference port of the differential pressure may be temporarily clogged.
Claims20
A method for operating an engine that includes a particulate filter in an exhaust system, comprising:
- not indicating degradation of a differential pressure sensor in response to an upstream pressure indication of the differential pressure sensor being less than a first pressure threshold, a downstream pressure indication of the differential pressure sensor being less than the first pressure threshold, and a differential pressure between the upstream pressure indication and the downstream pressure indication being less than a second pressure threshold;
- and
- operating the engine with a baseline particulate filter purging strategy in response to not indicating degradation of the differential pressure sensor.
An engine system, comprising:
- an internal combustion engine including a particulate filter and a differential pressure sensor configured to sense a pressure difference across at least a portion of the particulate filter;
- and
- a controller including executable instructions stored in non-transitory memory that cause the controller to operate the internal combustion engine and not indicate degradation of the differential pressure sensor in response to an upstream pressure indication of the differential pressure sensor being less than first pressure threshold, a downstream pressure indication of the differential pressure sensor being less than the first pressure threshold, and a differential pressure between the upstream pressure indication and the downstream pressure indication being less than a second pressure threshold.
A method for operating an engine that includes a particulate filter in an exhaust system, comprising:
- sensing an upstream pressure in the exhaust system upstream of the particulate filter in a direction of exhaust flow through the exhaust system while the engine has stopped rotating;
- sensing a downstream pressure in the exhaust system downstream of the particulate filter in the direction of exhaust flow through the exhaust system while the engine has stopped rotating;
- and
- operating the engine and not indicating degradation of a differential pressure sensor in response to a difference between the upstream pressure and the downstream pressure being less than a first threshold pressure while the upstream pressure and the downstream pressure are less than a second threshold pressure.
Dependencies are inferred from the claim text.