Determination of diesel particulate filter load under both transient and steady state drive cycles
First Claim
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1. A method for regenerating a particulate filter in an exhaust of a vehicle, the method comprising:
- estimating soot via operating conditions independent of pressure indications of a sensor at a first time interval;
providing an accumulated soot from the estimated soot at a second time interval, the second time interval slower than the first time interval; and
performing a regeneration of the particulate filter responsive to flow restriction induced pressure indications of the sensor, where during inaccurate sensor reading conditions, the regeneration is further responsive to a previous reading of the sensor during accurate sensor reading conditions and the accumulated soot.
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Abstract
Methods for updating the PF soot load of an engine are provided herein. In one example, a soot storage estimate is based on processing operations that occur at different timings. The method can improve soot estimation during some conditions.
35 Citations
15 Claims
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1. A method for regenerating a particulate filter in an exhaust of a vehicle, the method comprising:
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estimating soot via operating conditions independent of pressure indications of a sensor at a first time interval; providing an accumulated soot from the estimated soot at a second time interval, the second time interval slower than the first time interval; and performing a regeneration of the particulate filter responsive to flow restriction induced pressure indications of the sensor, where during inaccurate sensor reading conditions, the regeneration is further responsive to a previous reading of the sensor during accurate sensor reading conditions and the accumulated soot. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for regenerating a particulate filter in an exhaust of a vehicle, the method comprising:
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estimating soot via operating conditions independent of pressure indications of a sensor at a first time interval; providing an accumulated soot from the estimated soot at a second time interval, the second time interval slower than the first time interval; performing a regeneration of the particulate filter responsive to flow restriction induced pressure indications of the sensor, where during lower flow and transient conditions, the regeneration is further responsive to a previous reading of the sensor and the accumulated soot; and delaying adjustment of the accumulated soot after reading the sensor. - View Dependent Claims (8, 9, 10, 11)
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12. A method for regenerating a particulate filter in an exhaust of a vehicle, the method comprising:
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determining a first soot loading responsive at least to differential pressure across the particulate filter and measured by at least a pressure sensor; determining an incremental estimated soot loading of the particulate filter at a first time interval responsive to a plurality of operating conditions and independent from the pressure sensor; during higher flow conditions, performing regeneration responsive to the first soot loading and independent of the incremental estimated soot loading; during lower flow or transient conditions, performing regeneration responsive to a last first soot loading reading taken before entering the lower flow or transient conditions, and further based on accumulated soot at a second time interval, the second time interval slower than the first time interval, the accumulated soot based on the incremental estimated soot loading. - View Dependent Claims (13, 14, 15)
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Specification