SYSTEM FOR CONTROLLING ENGINE FUELING TO LIMIT ENGINE OUTPUT POWER
First Claim
1. A method for controlling fueling of an internal combustion engine, the engine including an intake manifold, one or more exhaust manifolds and a turbocharger coupled between the intake and exhaust manifolds, the method comprising:
- estimating an operating condition of the turbocharger,determining a maximum value of an operating parameter as a function of the estimated operating condition of the turbocharger,measuring a value of the operating parameter,determining an error value as a function of the maximum value of the first operating parameter and the measured value of the operating parameter, andlimiting fuel supplied to the engine based on the error value.
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Accused Products
Abstract
A method for controlling fueling of an internal combustion engine is provided. The engine may include an intake manifold, one or more exhaust manifolds and a turbocharger coupled between the intake and exhaust manifolds. The method may comprise estimating an operating condition of the turbocharger, determining a maximum value of an operating parameter as a function of the estimated operating condition of the turbocharger, measuring a value of the operating parameter, determining an error value as a function of the maximum value of the first operating parameter and the measured value of the operating parameter, and limiting fuel supplied to the engine based on the error value.
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Citations
34 Claims
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1. A method for controlling fueling of an internal combustion engine, the engine including an intake manifold, one or more exhaust manifolds and a turbocharger coupled between the intake and exhaust manifolds, the method comprising:
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estimating an operating condition of the turbocharger, determining a maximum value of an operating parameter as a function of the estimated operating condition of the turbocharger, measuring a value of the operating parameter, determining an error value as a function of the maximum value of the first operating parameter and the measured value of the operating parameter, and limiting fuel supplied to the engine based on the error value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for controlling fueling of an internal combustion engine, the engine including a turbocharger having a compressor fluidly coupled to an intake manifold of the engine and a turbine fluidly coupled to one or more exhaust manifolds of the engine, the method comprising:
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determining ambient pressure, estimating an inlet density of the turbocharger compressor as a function of the ambient pressure, measuring rotational speed of the turbocharger, determining a first maximum value of engine boost pressure as a function of the inlet density of the turbocharger compressor and of the rotational speed of the turbocharger, measuring engine exhaust temperature, determining a second maximum value of engine boost pressure as a function of the inlet density of the turbocharger compressor and of the engine exhaust temperature, measuring engine boost pressure, determining an error value as a function of a minimum of the first maximum value of engine boost pressure and the second maximum value of engine boost pressure and also as a function of the measured engine boost pressure, and limiting fuel supplied to the engine based on the error value. - View Dependent Claims (19, 20, 21)
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22. A method for controlling fueling of an internal combustion engine, the engine including a turbocharger having a compressor fluidly coupled to an intake manifold of the engine and a turbine fluidly coupled to one or more exhaust manifolds of the engine, the method comprising:
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determining ambient pressure, estimating an inlet density of the turbocharger compressor as a function of the ambient pressure, measuring rotational speed of the turbocharger, determining a first maximum value of engine boost pressure as a function of the inlet density of the turbocharger compressor and of the rotational speed of the turbocharger, measuring engine exhaust temperature, determining a second maximum value of engine boost pressure as a function of the inlet density of the turbocharger compressor and of the engine exhaust temperature, measuring engine boost pressure, determining a first error value as a function of a minimum of the first maximum value of engine boost pressure and the second maximum value of engine boost pressure and also as a function of the measured engine boost pressure, determining a maximum value of rotational speed of the turbocharger as a function of the inlet density of the turbocharger compressor, determining a second error value as a function of the maximum value of rotational speed of the turbocharger and of the measured rotational speed of the turbocharger, determining a maximum value of engine exhaust temperature as a function of the inlet density of the turbocharger compressor, determining a third error value as a function of the maximum value of engine exhaust temperature and of the measured engine exhaust temperature, and limiting fuel supplied to the engine based on a minimum of the first, second and third error values. - View Dependent Claims (23)
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24. A method for controlling fueling of an internal combustion engine, the engine including a fuel system having at least one fuel injector and a turbocharger having a compressor fluidly coupled to an intake manifold of the engine and a turbine fluidly coupled to at least one exhaust manifold of the engine, the method comprising:
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determining a fuel quantity to inject into the engine via the at least one fuel injector, mapping the determined fuel quantity to at least one injector on-time, determining a fuel limit value as a function of one or more of a difference between a maximum turbocharger speed and a measured turbocharger speed, a difference between a maximum boost pressure and a measured boost pressure and a difference between a maximum engine exhaust temperature and a measured engine exhaust temperature, and reducing the at least one injector on-time if the fuel limit value exceeds a threshold fuel value for at least a predetermined time period. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
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33. A method for controlling fueling of an internal combustion engine, the engine including a fuel system having at least one fuel injector and a turbocharger having a compressor fluidly coupled to an intake manifold of the engine and a turbine fluidly coupled to at least one exhaust manifold of the engine, the method comprising:
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measuring engine rotational speed, determining a maximum engine output torque of the engine as a function of the measured engine rotational speed, determining a fuel limit value as a function of one or more of a difference between a maximum turbocharger speed and a measured turbocharger speed, a difference between a maximum boost pressure and a measured boost pressure and a difference between a maximum engine exhaust temperature and a measured engine exhaust temperature, determining a fueling growth derate amount as a function of the fuel limit value and the maximum engine output torque if engine fueling is being limited by the fuel limit value, and activating an error flag if the fueling growth derate amount is greater than a threshold value. - View Dependent Claims (34)
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Specification