System and methods for purging an air intake system hydrocarbon trap to a fuel vapor canister
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B60W-010/30
F02M-025/08
F02M-035/10
B60W-020/40
B60W-010/06
B60W-010/08
F02D-041/04
F02M-035/02
출원번호
US-0042416
(2016-02-12)
등록번호
US-10183660
(2019-01-22)
발명자
/ 주소
Dudar, Aed M.
출원인 / 주소
Ford Global Technologies,LLC
대리인 / 주소
Voutyras, Julia
인용정보
피인용 횟수 :
0인용 특허 :
7
초록▼
A method for a vehicle engine is presented, wherein during a first condition, a vehicle controller is placed in a sleep mode following a vehicle-off event and then awoken following a duration, at which time contents of an air intake system hydrocarbon trap are purged to a fuel vapor canister by oper
A method for a vehicle engine is presented, wherein during a first condition, a vehicle controller is placed in a sleep mode following a vehicle-off event and then awoken following a duration, at which time contents of an air intake system hydrocarbon trap are purged to a fuel vapor canister by operating an electric motor to rotate the vehicle engine in a reverse direction. Rotating the vehicle engine in a reverse direction causes atmospheric air to enter an intake of the engine via an exhaust of the engine, desorbing hydrocarbons bound to the air intake system hydrocarbon trap. By porting the desorbed hydrocarbons to the fuel vapor canister, bleed emissions from the air intake system hydrocarbon trap may be reduced.
대표청구항▼
1. A method for a vehicle, comprising: executing, automatically, instructions stored in non-transitory memory of a controller, causing the controller to: during a first condition comprising a detected vehicle-off event, enter into a sleep mode;wake following a duration;open a canister vent valve and
1. A method for a vehicle, comprising: executing, automatically, instructions stored in non-transitory memory of a controller, causing the controller to: during a first condition comprising a detected vehicle-off event, enter into a sleep mode;wake following a duration;open a canister vent valve and a canister purge valve;close a fuel tank isolation valve and an intake throttle valve; andpurge adsorbed hydrocarbons from an air intake system hydrocarbon trap and direct desorbed hydrocarbons to a fuel vapor canister by operating an electric motor to rotate a vehicle engine in a reverse direction causing air to flow from an engine exhaust, across the air intake system hydrocarbon trap, and to the fuel vapor canister, while maintaining the fuel tank isolation valve and the intake throttle valve closed, and while maintaining the canister vent valve and the canister purge valve open. 2. The method of claim 1, wherein rotating the vehicle engine in the reverse direction comprises rotating the vehicle engine in an opposite direction from a default direction, and further comprises rotating the vehicle engine to generate a vacuum in the engine exhaust. 3. The method of claim 1, wherein the first condition includes an indication to purge the air intake system hydrocarbon trap to the fuel vapor canister. 4. The method of claim 3, wherein the indication to purge the air intake system hydrocarbon trap to the fuel vapor canister is based on an air intake system hydrocarbon trap load. 5. The method of claim 4, wherein the air intake system hydrocarbon trap load is based on an amount of engine drive time during a drive cycle immediately preceding the vehicle-off event. 6. The method of claim 5, wherein the indication to purge the air intake system hydrocarbon trap to the fuel vapor canister is based on an evaluation by the vehicle controller that the drive cycle immediately preceding the vehicle-off event comprised operation in a combustion mode followed by operation in a battery-only mode. 7. The method of claim 3, wherein the first condition comprises a canister load below a threshold. 8. The method of claim 1, wherein the vehicle engine is rotated in the reverse direction without combusting fuel, and wherein the method further comprises: during a second condition, operating the electric motor to rotate the vehicle engine in a forward direction. 9. The method of claim 1, further comprising: following purging contents of the air intake system hydrocarbon trap to the fuel vapor canister, restoring the vehicle engine to a default, engine-off position. 10. The method of claim 1, further comprising: following purging contents of the air intake system hydrocarbon trap to the fuel vapor canister, updating a canister purge schedule. 11. The method of claim 1, wherein the first condition includes an indication to purge the air intake system hydrocarbon trap based on engine operating parameters during a drive cycle immediately preceding the vehicle-off event. 12. A system for a vehicle, comprising: an engine comprising one or more cylinders, each cylinder comprising an intake valve and an exhaust valve;an engine exhaust;a fuel vapor canister coupled to an engine intake via a canister purge valve;an intake throttle valve coupled between the engine intake and atmosphere;a fuel tank isolation valve;a canister vent valve;an air intake system hydrocarbon trap deposed within the engine intake;an electric motor configured to rotate the engine; anda controller configured with instructions stored in non-transitory memory that, when executed, cause the controller to: during a first condition comprising a detected vehicle-off event, enter a sleep mode;wake automatically following a duration from the sleep mode;close the intake throttle valve and the fuel tank isolation valve;open the canister purge valve and the canister vent valve; andpurge contents of the air intake system hydrocarbon trap to the fuel vapor canister by operating an electric motor to rotate the engine in a reverse direction, while maintaining the fuel tank isolation valve and the intake throttle valve closed, and while maintaining the canister vent valve and the canister purge valve open, causing air to flow from the engine exhaust, across the air intake system hydrocarbon trap, and to the fuel vapor canister. 13. The system of claim 12, wherein the controller is further configured with instructions stored in non-transitory memory that, when executed, cause the controller to: operate the electric motor to rotate the engine in the reverse direction without combusting fuel, and then return to the sleep mode. 14. The system of claim 13, wherein the controller is further configured with instructions stored in non-transitory memory that, when executed, cause the controller to: sequentially open the exhaust valve and the intake valve of an engine cylinder while rotating the engine in the reverse direction. 15. The system of claim 13, wherein the controller is further configured with instructions stored in non-transitory memory that, when executed, cause the controller to: simultaneously open the exhaust valve and the intake valve of an engine cylinder while rotating the engine in the reverse direction. 16. The system of claim 12, wherein the controller is further configured with instructions stored in non-transitory memory that, when executed, cause the controller to: following purging contents of the air intake system hydrocarbon trap to the fuel vapor canister, restore the engine to a default, engine-off position; andupdate a canister purge schedule. 17. The system of claim 12, wherein the first condition includes an indication to purge the air intake system hydrocarbon trap based on engine operating parameters during a drive cycle immediately preceding the vehicle-off event. 18. A method for a hybrid vehicle, comprising: following a detected vehicle-off event, responsive to a fuel vapor canister load below a threshold and an indication to purge an air intake system hydrocarbon trap, a controller automatically executes instructions stored in non-transitory memory, causing the controller to: enter a sleep mode for a duration;wake following the duration;close an intake throttle valve and a fuel tank isolation valve;open a canister purge valve and a canister vent valve;purge contents of the air intake system hydrocarbon trap directly to a fuel vapor canister by operating an electric motor to rotate an engine in a reverse direction, while maintaining the fuel tank isolation valve and the intake throttle valve closed, and while maintaining the canister vent valve and the canister purge valve open, causing air to flow from an engine exhaust, across the air intake system hydrocarbon trap, and to the fuel vapor canister;restore the engine to a default, engine-off position; andupdate a fuel vapor canister purge schedule.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (7)
Boggs, David Lee; Robichaux, Jerry D.; Peters, Mark William; Kotre, Stephen John, Controlled engine shutdown for a hybrid electric vehicle.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.