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US 12,234,757 B1Granted
Methods and systems for regenerating a particulate filter
AssigneeFord Global Technologies, LLC
InventorAed Dudar
Life of this patent
Estimating the term…
Abstract
Systems and methods for heating a vehicle via a fuel operated heater are presented. In one example, the fuel operated heater heats a catalyst in an exhaust system of an internal combustion engine to reduce engine emissions. In another example, the fuel operated heater heats a particulate filter to purge soot from the particulate filter.
Claims14
A method for purging a particulate filter, comprising:
- via a controller, during a first stopped engine condition, operating a fuel operated heater that is configured to heat a passenger cabin of a vehicle in response to a request to purge the particulate filter of carbonaceous soot and directing exhaust from the fuel operated heater to the particulate filter, the fuel operated heater operating with a lean air-fuel ratio, and, during a second stopped engine condition, operating the fuel operated heater with a stoichiometric air-fuel ratio and directing exhaust from the fuel operated heater to a three-way type catalyst.
A vehicle heating system, comprising:
- an internal combustion engine including an exhaust system, the exhaust system including a particulate filter and a three-way catalyst, the exhaust system further including a first oxygen sensor positioned upstream of the three-way catalyst and a second oxygen sensor positioned downstream of the three-way catalyst and upstream of the particulate filter;
- a fuel operated heater configured to supply heat to a passenger cabin of a vehicle and exhaust to the exhaust system;
- and
- one or more controllers including executable instructions stored in non-transitory memory that cause the one or more controllers to activate the fuel operated heater in response to the internal combustion engine being stopped and a request to purge the particulate filter of carbonaceous soot, and that cause the one or more controllers to combust stoichiometric and lean air-fuel ratios in the fuel operated heater depending on operating conditions, where activating the fuel operated heater includes supplying fuel to the fuel operated heater, the supplied fuel adjusted in response to the first oxygen sensor and the second oxygen sensor.
1 more element
Dependencies are inferred from the claim text.