Airflow estimation for engines with displacement on demand
First Claim
1. A control method for a displacement on demand engine, comprising:
- providing a model for estimating cylinder air charge, wherein said model includes a history vector of inputs and states;
updating said history vector of inputs and states when a cylinder firing interrupt occurs;
determining an operating mode of said engine;
based on said operating mode, selecting model parameters and model inputs;
estimating said cylinder air charge; and
wherein said operating mode of said engine includes partially displaced and fully displaced operating cylinder modes.
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Abstract
A control method and system according to the present invention for a displacement on demand engine estimates cylinder air charge and/or predicts cylinder air charge for future cylinder interrupts. A model is provided that estimates cylinder air charge and/or predicts cylinder air charge for future cylinder interrupts. The model includes a history vector of inputs and states. The history vector of inputs and states are updated when a cylinder firing interrupt occurs. An operating mode of the engine is determined. Based on the operating mode, model parameters and model inputs are selected. The cylinder air charge is estimated and predicted for future cylinder interrupts.
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Citations
36 Claims
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1. A control method for a displacement on demand engine, comprising:
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providing a model for estimating cylinder air charge, wherein said model includes a history vector of inputs and states;
updating said history vector of inputs and states when a cylinder firing interrupt occurs;
determining an operating mode of said engine;
based on said operating mode, selecting model parameters and model inputs;
estimating said cylinder air charge; and
wherein said operating mode of said engine includes partially displaced and fully displaced operating cylinder modes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A control system for a displacement on demand engine, comprising:
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a mass airflow meter located in an airflow inlet to said engine;
a fuel injector for metering fuel to said engine;
a controller coupled to said mass airflow meter and said fuel injector and including a processor and memory; and
an air charge model that is executed by said controller and that estimates cylinder air charge, wherein said controller updates a history vector of inputs and states of said model when a cylinder firing interrupt occurs, wherein said controller selects model parameters and model inputs based on said operating mode of said engine and estimates said cylinder air charge; and
wherein said operating mode of said engine includes half and full cylinder modes. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An control method for a displacement on demand engine, comprising:
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providing a model that is capable of predicting cylinder air charge for future cylinder firing interrupts, wherein said model includes a history vector of inputs and states;
updating said history vector inputs and states when a cylinder firing interrupt occurs;
determining an operating mode of said engine;
based on said operating mode, selecting model parameters and model inputs;
predicting said cylinder air charge for at least one future cylinder firing interrupt; and
wherein said operating mode of said engine includes half and full cylinder modes. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. A control system for a displacement on demand engine, comprising:
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a mass airflow meter located in an airflow inlet to said engine;
a fuel injector for metering fuel to said engine;
a controller coupled to said mass airflow meter and said fuel injector and including a processor and memory; and
an airflow model that is executed by said controller and that is capable of predicting cylinder air charge for future cylinder interrupts, wherein said controller updates a history vector of inputs and states of said model when a cylinder firing interrupt occurs, wherein said controller selects model parameters and model inputs based on said operating mode of said engine and predicts said cylinder air charge for said future cylinder firing interrupts; and
wherein said model is capable of estimating cylinder air charge and wherein said controller estimates cylinder air charge for said future cylinder firing interrupts. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
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Specification