Method and apparatus for purging SOX from a NOX trap
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F01N-003/00
출원번호
US-0245884
(2002-09-18)
발명자
/ 주소
Smaling, Rudolf M.
출원인 / 주소
Arvin Technologies, Inc.
대리인 / 주소
Barnes & Thornburg LLP
인용정보
피인용 횟수 :
13인용 특허 :
84
초록▼
A method of operating a fuel reformer to regenerate a NO X trap includes operating the fuel reformer to produce a reformate gas comprising hydrogen and carbon monoxide and advancing reformate gas through the NO X trap so as to regenerate the NO X trap. The method further includes determining if a
A method of operating a fuel reformer to regenerate a NO X trap includes operating the fuel reformer to produce a reformate gas comprising hydrogen and carbon monoxide and advancing reformate gas through the NO X trap so as to regenerate the NO X trap. The method further includes determining if a SO X regeneration of the NO X trap is to be performed and generating a SO X -regeneration control signal in response thereto. The temperature of the NO X trap is raised and reformate gas is advanced into the NO X trap in response to the SO X -regeneration signal so as to remove SO X from within the NO X trap. A fuel reformer system is also disclosed.
대표청구항▼
1. A method of operating a fuel reformer to regenerate a NO X trap, the method comprising the steps of:(a) operating the fuel reformer so as to produce a reformate gas comprising hydrogen and carbon monoxide,(b) advancing the reformate gas through the NO X trap so as to regenerate the NO X trap,(
1. A method of operating a fuel reformer to regenerate a NO X trap, the method comprising the steps of:(a) operating the fuel reformer so as to produce a reformate gas comprising hydrogen and carbon monoxide,(b) advancing the reformate gas through the NO X trap so as to regenerate the NO X trap,(c) determining if a SO X regeneration of the NO X trap is to be performed and generating a SO X -regeneration control signal in response thereto,(d) raising the temperature of the NO X trap in response to the SO X -regeneration control signal, and(e) operating the fuel reformer so as to advance the reformate gas into the NO X trap in response to the SO X -regeneration control signal. 2. The method of claim 1, wherein steps (d) and (e) are performed contemporaneously. 3. The method of claim 1, wherein step (d) is performed before step (e). 4. The method of claim 1, wherein:the determining step includes determining the number of NO X purges performed and comparing the number of NO X purges performed to a predetermined setpoint number of NO X purges, andthe SO X -regeneration control signal is generated when the number of NO X purges is greater than or equal to the predetermined setpoint number of NO X purges. 5. The method of claim 1, wherein the step of raising the temperature of the NO X trap includes raising the temperature of exhaust gases advancing through the NO X trap from an internal combustion engine. 6. The method of claim 5, wherein the step of raising the temperature of exhaust gases includes decreasing an air-to-fuel ratio of an air/fuel mixture being introduced into the internal combustion engine. 7. A fuel reformer assembly for producing reformate gas, the fuel reformer assembly comprising:a fuel reformer, anda reformer controller electrically coupled to the fuel reformer, the controller comprising (i) a processing unit, and (ii) a memory unit electrically coupled to the processing unit, the memory unit having stored therein a plurality of instructions which, when executed by the processing unit, causes the processing unit to:(a) operate the fuel reformer so as to produce a reformate gas comprising hydrogen and carbon monoxide,(b) operate the fuel reformer so as to advance the reformate gas through a NO X trap so as to regenerate the NO X trap,(c) determine if a SO X regeneration of the NO X trap is to be performed and generate a SO X -regeneration control signal in response thereto,(d) raise the temperature of the NO X trap in response to die SO X -regeneration control signal, and(e) operate the fuel reformer so as to advance the reformate gas into the NO X trap in response to the SO X -regeneration control signal. 8. The fuel reformer assembly of claim 7, wherein the raising the temperature step comprises generating a temperature control signal which is communicated to an engine control unit so as to cause the engine control unit to decrease an air-to-fuel ratio of an air/fuel mixture being introduced into an internal combustion engine to raise the temperature of exhaust gases exiting the internal combustion engine to be advanced through the NO X trap. 9. The fuel reformer assembly of claim 7, further including a sensor to sense the amount of SO X within the NO X trap, and wherein the plurality of instructions, when executed by the processing unit, further causes the processing unit to:(i) generate a SO X control signal when the amount of SO X within the NO X trap reaches a predetermined level, and(ii) raise the temperature of the NO X trap in response to generation of the SO X control signal. 10. The fuel reformer assembly of claim 7, wherein the plurality of instructions, when executed by the processing unit, further causes the processing unit to:(i) determine when a predetermined period of time has elapsed since a previous SO X purge had been performed and generate a time-lapsed control signal in response thereto, and(ii) raise the temperature of the NO X trap in response to gener ation of the SO X control signal. 11. The fuel reformer assembly of claim 7, wherein the plurality of instructions, when executed by the processing unit, further causes the processing unit to:(i) determine the number of NO X purges performed and compare the number of NO X purges performed to a predetermined setpoint number of NO X purges, and(ii) generate the SO X control signal when the number of NOX purges is greater than or equal to the predetermined setpoint number of NOX purges.
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