IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0715444
(2010-03-02)
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등록번호 |
US-8453431
(2013-06-04)
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발명자
/ 주소 |
- Wang, Yue-Yun
- He, Yongsheng
- Brown, David B.
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출원인 / 주소 |
- GM Global Technology Operations LLC
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인용정보 |
피인용 횟수 :
9 인용 특허 :
8 |
초록
▼
A method for controlling an internal combustion engine includes monitoring engine operation including a parameter descriptive of NOx generation within the engine, determining a fast transient NOx estimate with a dynamic model based upon the monitored engine operation, and during a fast transient eng
A method for controlling an internal combustion engine includes monitoring engine operation including a parameter descriptive of NOx generation within the engine, determining a fast transient NOx estimate with a dynamic model based upon the monitored engine operation, and during a fast transient engine operation including an increase in an operating state of the engine and a substantial closing of an exhaust gas recirculation valve, controlling an engine system based upon the fast transient NOx estimate.
대표청구항
▼
1. Method for controlling an internal combustion engine, the method comprising: monitoring engine operation comprising a parameter descriptive of NOx generation within the engine;determining a fast transient NOx estimate with a dynamic model based upon the monitored engine operation; andduring a fas
1. Method for controlling an internal combustion engine, the method comprising: monitoring engine operation comprising a parameter descriptive of NOx generation within the engine;determining a fast transient NOx estimate with a dynamic model based upon the monitored engine operation; andduring a fast transient engine operation comprising an increase in an operating state of the engine and a substantial closing of an exhaust gas recirculation valve, controlling an engine system based upon the fast transient NOx estimate;wherein controlling the engine system comprises:comparing the fast transient NOx estimate to a fast transient NOx threshold calibrated based upon the closing of the exhaust gas recirculation valve and a rate of acceleration of the engine exceeding a threshold rate of acceleration; andcontrolling the engine system in the vehicle during the fast transient engine operation based when the fast transient NOx estimate is greater than the fast transient NOx threshold. 2. The method of claim 1, wherein controlling the engine system comprises: comparing the fast transient NOx estimate to a fast transient NOx threshold calibrated based upon the closing of the exhaust gas recirculation valve and a rate of increase of a fuel air ratio of the engine exceeding a threshold rate of increase of the fuel air ratio of the engine; andcontrolling the engine system in the vehicle during the fast transient engine operation based when the fast transient NOx estimate is greater than the fast transient NOx threshold. 3. Method for controlling an internal combustion engine, the method comprising: monitoring engine operation comprising a parameter descriptive of NOx generation within the engine;determining a fast transient NOx estimate with a dynamic model based upon the monitored engine operation; andduring a fast transient engine operation comprising an increase in an operating state of the engine and a substantial closing of an exhaust gas recirculation valve, controlling an engine system based upon the fast transient NOx estimate;wherein monitoring engine operation comprising the parameter descriptive of NOx generation within the engine comprises monitoring a measurement of the parameter, the method further comprising:determining a reference command of the parameter;determining an error of the parameter based upon a difference of the measurement of the parameter and the reference command of the parameter; andwherein controlling the engine system during the fast transient engine operation comprises: comparing the error of the parameter to a threshold error of the parameter; andcontrolling the system in the vehicle during the fast transient engine operation based upon an absolute value of the error of the parameter being greater than the threshold error of the parameter. 4. Method for controlling an internal combustion engine, the method comprising: monitoring engine operation comprising a parameter descriptive of NOx generation within the engine;determining a fast transient NOx estimate with a dynamic model based upon the monitored engine operation; andduring a fast transient engine operation comprising an increase in an operating state of the engine and a substantial closing of an exhaust gas recirculation valve, controlling an engine system based upon the fast transient NOx estimate;wherein controlling the engine system during the fast transient engine operation is based upon estimating the substantial closing of the exhaust gas recirculation valve during the increase in the operating state of the engine;wherein monitoring the engine operation further comprises monitoring the operating state of the engine comprising an engine speed and an engine load; andwherein estimating the substantial closing of the exhaust gas recirculation valve during the increase in the operating state of the engine comprises: monitoring the increase in the operating state of the engine based upon the monitored engine operation;determining an expected fuel air ratio based upon the engine speed and the engine load;monitoring a measured fuel air ratio;comparing the expected fuel air ratio to the measured fuel air ratio; anddetermining the substantial closing of the exhaust gas recirculation valve during the increase in the operating state of the engine based upon the measured fuel air ratio being greater than the expected fuel air ratio by more than a predetermined amount. 5. The method of claim 1, wherein monitoring engine operation further comprises monitoring parameters descriptive of NOx generation within the engine during a steady state engine operation comprising an engine operation that is not a fast transient engine operation, the method further comprising: determining a steady state NOx estimate based upon the monitored engine operation; andwherein controlling the system during the fast transient engine operation is further based upon the steady state NOx estimate. 6. The method of claim 5, wherein the dynamic model comprises a nonlinear dynamic model in discrete state space, and wherein the steady state NOx estimate utilizes an artificial neural network. 7. The method of claim 5, wherein determining the steady state NOx estimate comprises utilizing a nonlinear regression model. 8. The method of claim 1, wherein monitoring engine operation comprising the parameter descriptive of NOx generation within the engine comprises monitoring an exhaust gas recirculation rate. 9. The method of claim 1, wherein monitoring engine operation comprising the parameter descriptive of NOx generation within the engine comprises monitoring an intake air flow rate. 10. Method for controlling an internal combustion engine, the method comprising: monitoring engine operation including parameters descriptive of combustion within the engine;determining a steady state NOx estimate with an artificial neural network based upon the monitored engine operation;determining a fast transient NOx estimate with a dynamic model based upon the monitored engine operation;during a fast transient engine operation comprising an increase in an operating state of the engine and a substantial closing of an exhaust gas recirculation valve, determining an engine out NOx estimate based upon the steady state NOx estimate and the fast transient NOx estimate; andcontrolling operation of a system within the vehicle based upon the engine out NOx estimate;wherein the parameters descriptive of combustion within the engine comprise an intake air flow into the engine and an exhaust gas recirculation flow into the engine; andwherein determining the fast transient NOx estimate based upon the monitored engine operation comprises determining the fast transient NOx estimate based upon an intake air flow error describing a difference between an intake air flow reference command and a measured intake air flow and an exhaust gas recirculation error describing a difference between an exhaust gas recirculation reference command and a measured exhaust gas recirculation. 11. The method of claim 10, wherein the dynamic model is a nonlinear transient dynamic model in discrete state space comprising matrices determined based upon experimental operation of a test engine. 12. The method of claim 10, wherein determining the fast transient NOx estimate based upon the monitored engine operation further comprises determining the fast transient NOx estimate further based upon a square of the intake air flow error and a square of the exhaust gas recirculation error. 13. The method of claim 10, wherein the exhaust gas recirculation reference command is calculated based upon an engine speed and a fuel flow into the engine. 14. The method of claim 10, wherein determining the fast transient NOx estimate based upon the monitored engine operation further comprises: comparing an absolute value of the intake air flow error to a threshold error of the intake air flow;neglecting the intake air flow error if the absolute value of the intake air flow error is less than the threshold error of the intake air flow;comparing an absolute value of the exhaust gas recirculation error to a threshold error of the exhaust gas recirculation; andneglecting the exhaust gas recirculation error if the absolute value of the exhaust gas recirculation error is less than the threshold error of the exhaust gas recirculation. 15. The method of claim 10, wherein the parameters descriptive of combustion within the engine comprise an exhaust gas recirculation flow into the engine and a parameter selected from the group consisting of an engine air fuel ratio, an intake oxygen percentage, a fuel flow into the engine, an engine output torque, an intake manifold temperature, and a start of injection timing. 16. The method of claim 10, wherein the parameters descriptive of combustion within the engine comprise an exhaust gas recirculation flow into the engine, an engine air fuel ratio, a fuel flow into the engine, a start of injection timing, and an intake manifold temperature. 17. The method of claim 10, wherein controlling operation of the engine system based upon the engine out NOx estimate comprises controlling regeneration of a lean NOx trap. 18. The method of claim 10, wherein controlling operation of the engine system based upon the engine out NOx estimate comprises controlling urea dosing to a selective catalytic reduction device.
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