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US 10,378,400 B2Granted
Systems and methods for particulate filter regeneration
AssigneeFord Global Technologies, LLC
InventorsMichael James Uhrich, Joseph Norman Ulrey, Ross Dykstra Pursifull, Christopher Paul Glugla, Emil G. Serban
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Abstract
Methods and systems are provided for adjusting engine compression ratio (CR) and spark timing to attain particulate filter (PF) regeneration temperature. In one example, a method may include, in response to PF load reaching a threshold and PF temperature being lower than the PF regeneration temperature, lowering the CR and then selectively adjusting spark timing based on an estimated residual gas fraction (RGF) at the lower CR.
Claims20
A method, comprising:
- responsive to each of a higher than threshold load and a lower than threshold temperature at an exhaust particulate filter (PF),
- selectively lowering an engine compression ratio (CR) by actuating a variable compression ratio (VCR) mechanism to mechanically alter a piston position within a cylinder of an engine;
- and
- selectively adjusting spark timing based on each of a PF temperature and an estimated residual gas fraction (RGF) at the lower CR.
1 more element
A method, comprising:
- during a first exhaust particulate filter (PF) regeneration, lowering a compression ratio (CR) by actuating a variable compression ratio (VCR) mechanism to mechanically alter a piston position within a cylinder of an engine, and regenerating a PF at the lower CR with a first amount of spark retard from maximum brake torque (MBT) timing, the first amount based on a residual gas fraction (RGF) at the lower CR;
- and
- during a second PF regeneration, maintaining the CR, and regenerating the PF at a higher CR with a second amount of spark retard from MBT, the second amount based on an RGF at the higher CR, the second amount of spark retard larger than the first amount of spark retard.
A vehicle system, comprising:
- a vehicle;
- a torque converter including a lock-up clutch;
- a transmission system;
- an engine;
- a variable compression ratio mechanism for mechanically altering a piston displacement within each engine cylinder;
- an exhaust passage including a particulate filter (PF), and each of a pressure sensor and a temperature sensor coupled upstream of the PF;
- and
- a controller with computer readable instructions for:
- responsive to each of a lower than threshold PF temperature while PF load is higher than a threshold load and the torque converter is locked, actuating the variable compression ratio mechanism to a position corresponding to a lower compression ratio (CR);
- responsive to each of the lower than threshold PF temperature while the PF load is higher than a threshold load and the torque converter is locked, actuating the variable compression ratio mechanism to a position corresponding to a lower compression ratio (CR);
- and
- responsive to PF temperature at the lower CR being lower than the threshold temperature, retarding spark timing towards an updated spark timing stability limit based on a residual gas fraction (RGF) in the cylinder at the lower CR.
9 more elements
Dependencies are inferred from the claim text.