PREDICTIVE MODELING AND REDUCING CYCLIC VARIABILITY IN AUTOIGNITION ENGINES
First Claim
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1. A method of controlling a vehicle engine to reduce cycle-to-cycle combustion variation, the method comprising:
- applying a predictive model to predict cycle-to-cycle combustion behaviour of an engine based on observed engine performance variables;
identifying conditions that indicate high cycle-to-cycle combustion variation based on the predicted cycle-to-cycle combustion behaviour; and
applying corrective measures to prevent the predicted high cycle-to-cycle combustion variation.
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Abstract
Methods and systems are provided for controlling a vehicle engine to reduce cycle-to-cycle combustion variation. A predictive model is applied to predict cycle-to-cycle combustion behaviour of an engine based on observed engine performance variables. Conditions are identified, based on the predicted cycle-to-cycle combustion behaviour, that indicate high cycle-to-cycle combustion variation. Corrective measures are then applied to prevent the predicted high cycle-to-cycle combustion variation.
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Citations
20 Claims
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1. A method of controlling a vehicle engine to reduce cycle-to-cycle combustion variation, the method comprising:
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applying a predictive model to predict cycle-to-cycle combustion behaviour of an engine based on observed engine performance variables; identifying conditions that indicate high cycle-to-cycle combustion variation based on the predicted cycle-to-cycle combustion behaviour; and applying corrective measures to prevent the predicted high cycle-to-cycle combustion variation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of controlling a vehicle engine to reduce cycle-to-cycle combustion variation, the method comprising:
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determining a set of one or more engine operating conditions; comparing the set of one or more engine operating conditions to a set of defined operating regions; operating the engine in a spark ignition mode when the set of one or more engine operating conditions is within a first defined operating region; operating the engine in a homogenous charge compression ignition mode when the set of one or more engine operating conditions is within a second defined operating region; and when transitioning from the spark ignition mode to the homogeneous charge compression ignition mode, applying a predictive model to predict at least one of a combustion phasing and a mean effective pressure value of an engine cylinder for each of a plurality of future combustion cycles based, at least in part, on a determined cylinder temperature and a determined amount of unburned fuel remaining in a cylinder after a current combustion cycle is complete, identifying variations in the at least one of the combustion phasing and the predicted mean effective pressure values for the cylinder which indicate high cycle-to-cycle combustion variation, and adjusting at least one of an injected fuel quantity and a fuel injection timing for a subsequent combustion cycle to prevent the predicted high cycle-to-cycle combustion variation.
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20. A method of controlling a vehicle engine to reduce cycle-to-cycle combustion variation, the method comprising:
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determining a set of one or more engine operating conditions; comparing the set of one or more engine operating conditions to a set of defined operating regions; determining that the engine is operating in a stable HCCI region when the set of one or more operating conditions is within a first defined operating region, wherein the engine is unlikely to exhibit high cycle-to-cycle combustion variation in the stable HCCI region; determining that the engine is operating in an unstable HCCI region when the set of one or more operating conditions is within a second defined operating region, wherein the engine is more likely to exhibit high cycle-to-cycle combustion variation in the unstable HCCI region as compared to the stable HCCI region; and when it is determined that the engine is operating in the unstable HCCI region, applying a predictive model to predict at least one of a combustion phasing and a mean effective pressure value of an engine cylinder for each of a plurality of future combustion cycles based, at least in part, on a determined cylinder temperature and a determined amount of unburned fuel remaining in a cylinder after a current combustion cycle is complete, identifying variations in the at least one of the combustion phasing and the predicted mean effective pressure values for the cylinder which indicate high cycle-to-cycle combustion variation, and adjusting at least one of an injected fuel quantity and a fuel injection timing for a subsequent combustion cycle to prevent the predicted high cycle-to-cycle combustion variation.
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Specification