Techniques for determining turbocharger speed
First Claim
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1. A method, comprising:
- sensing speed of an internal combustion engine, the engine including a turbocharger with a compressor, the compressor including an inlet and an outlet, the outlet being coupled to an intake of the engine;
sensing inlet pressure and boost pressure of the compressor;
determining a value corresponding to turbocharger speed from the speed of the internal combustion engine, the inlet pressure, and the boost pressure; and
refining the value as a function of change of the boost pressure with time to represent the turbocharger speed.
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Abstract
One embodiment of the present invention includes an internal combustion engine with a turbocharger. The turbocharger includes a compressor with an outlet coupled to an intake of the engine and a turbine coupled to an exhaust manifold of the engine. A a turbocharger speed estimate is determined from engine speed and a ratio between inlet and boost pressure for the compressor. The turbocharger speed estimate is further adjusted as a function of compressor boost pressure variation with time.
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Citations
21 Claims
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1. A method, comprising:
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sensing speed of an internal combustion engine, the engine including a turbocharger with a compressor, the compressor including an inlet and an outlet, the outlet being coupled to an intake of the engine;
sensing inlet pressure and boost pressure of the compressor;
determining a value corresponding to turbocharger speed from the speed of the internal combustion engine, the inlet pressure, and the boost pressure; and
refining the value as a function of change of the boost pressure with time to represent the turbocharger speed. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method, comprising:
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providing an internal combustion engine including a turbocharger, the turbocharger including a compressor with an outlet coupled to an intake of the engine;
determining a turbocharger speed estimate from speed of the engine and a pressure ratio for the compressor; and
adjusting the turbocharger speed estimate as a function of compressor boost pressure variation with time. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A system, comprising:
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an internal combustion engine;
a speed sensor operable to provide a first signal representative of engine speed;
a turbocharger including a compressor with an inlet and an outlet, the outlet being coupled to an intake of the engine;
a pressure sensing arrangement operable to provide a second signal representative of intake pressure of the compressor and a third signal representative of outlet pressure of the compressor; and
a controller responsive to the first signal, the second signal, and the third signal to determine a value as a function of the engine speed and a pressure ratio, the pressure ratio being between the intake pressure and the outlet pressure, the controller being operable to adjust the value based on variation of the outlet pressure with time to provide a fourth signal representative of turbocharger speed. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. An apparatus, comprising:
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means for sensing speed of an internal combustion engine, the engine including a turbocharger with a compressor, the compressor including an inlet and an outlet coupled to an intake of the engine;
means for filtering the speed of the internal combustion engine;
means for sensing inlet temperature, inlet pressure, and boost pressure of the turbocharger compressor;
means for filtering the boost pressure;
means for determining a value corresponding to uncorrected turbocharger speed from the speed of the internal combustion engine, the inlet pressure, and the boost pressure;
means for correcting the value with the inlet temperature to correspond to a temperature corrected turbocharger speed; and
means for refining the value as a function of a time derivative of the boost pressure to provide a refined turbocharger speed.
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Specification