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US 10,836,397 B1Granted
System and method for increasing catalyst temperature
AssigneeFord Global Technologies, LLC
InventorsM. Scott Christensen, Adam Joseph Krach, Michael Bastanipour, Nicholas Herhusky, Alexander O'Connor Gibson
Life of this patent
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Abstract
Systems and methods for operating an engine and a transmission to reduce a catalyst light off time are disclosed. In one example, clutches of a transmission are operated to provide a desired load to the engine so that engine combustion stability may be improved while supplying heat to a catalyst so that the catalyst light off time may be reduced.
Claims20
A vehicle operating method, comprising:
- locking two transmission clutches and adjusting a torque capacity of a third transmission clutch via a controller in response to an engine cold start request;
- and
- starting an engine and retarding spark timing of the engine from a minimum spark timing for best engine torque spark timing via the controller in response to the engine cold start request.
A vehicle operating method, comprising:
- locking two transmission clutches and adjusting a torque capacity of a third transmission clutch to a value that is a function of gear ratio of a planetary gear set and a desired load applied to an engine via a controller in response to an engine cold start request;
- and
- starting the engine via the controller in response to the engine cold start request.
A system, comprising:
- an engine;
- an automatic transmission coupled to the engine;
- and
- a controller including executable instructions stored in non-transitory memory to engage a parking pawl of the automatic transmission, fully close two clutches of the automatic transmission, and adjust a torque capacity of a third transmission clutch in response to a request to heat a fluid of the automatic transmission.
1 more element
Dependencies are inferred from the claim text.