METHOD AND SYSTEM FOR ENGINE AIR-CHARGE ESTIMATION
First Claim
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1. A method of estimating air-charge for an engine comprising a sequence of the steps of:
- measuring the mass air flow through the engine throttle with a mass air flow sensor (MAF);
measuring the pressure in the engine intake manifold with a pressure sensor (MAP);
estimating the flow through the throttle based on the signal from the MAF sensor and compensating for the MAF sensor dynamics;
estimating the intake manifold pressure based on the signal from the MAP sensor and filtering the noise, and periodic oscillations at engine firing frequency, contained in the MAP sensor signal and the MAF sensor signals; and
estimating the volumetric efficiency and providing an estimate of the air flow into the engine.
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Abstract
The air flow into an engine is estimated via a speed-density calculation wherein the volumetric efficiency is estimated on-line. There are three interconnected observers in the estimation scheme. The first observer estimates the flow through the throttle based on the signal from a mass air flow sensor (MAF). The second observer estimates the intake manifold pressure using the ideal gas law and the signal from a intake manifold absolute pressure sensor (MAP). The third observer estimates the volumetric efficiency and provides an estimate of the air flow into the engine.
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Citations
19 Claims
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1. A method of estimating air-charge for an engine comprising a sequence of the steps of:
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measuring the mass air flow through the engine throttle with a mass air flow sensor (MAF);
measuring the pressure in the engine intake manifold with a pressure sensor (MAP);
estimating the flow through the throttle based on the signal from the MAF sensor and compensating for the MAF sensor dynamics;
estimating the intake manifold pressure based on the signal from the MAP sensor and filtering the noise, and periodic oscillations at engine firing frequency, contained in the MAP sensor signal and the MAF sensor signals; and
estimating the volumetric efficiency and providing an estimate of the air flow into the engine.
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2. A system for estimating air-charge for a engine comprising:
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a mass air flow (MAF) sensor;
a first observer for estimating the flow through the throttle based on the signal from the MAF sensor and for compensating for the MAF sensor dynamics;
a manifold absolute pressure (MAP) sensor;
a second observer for estimating the intake manifold pressure based on the signal from the MAP sensor and for filtering the noise, and periodic oscillations at engine firing frequency, contained in the MAP sensor signal and the MAF sensor signals;
a third observer for estimating the volumetric efficiency and providing an estimate of the air flow into the engine. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A system for controlling operation of a fuel control system having fuel injector means for supplying fuel to an engine, said fuel injector means being responsive to a fuel control signal based on air flow into the engine intake manifold comprising;
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sensor means for sensing conditions of operation of said engine and for producing data indicative thereof, said sensor means including a mass air flow (MAF) sensor for measuring air flow into the intake manifold and a manifold absolute pressure (MAP) sensor;
observer means for generating real time estimates of air charge entering the engine based on data from said sensors;
said observer means compensating for MAF sensor dynamics, estimating the intake manifold pressure based on the ideal gas law and data from said MAP sensor and filtering noise and periodic oscillations at engine firing frequency contained in the data from said MAF and MAP sensors, and estimating the volumetric efficiency and the air flow into the engine using a speed density equation wherein the volumetric efficiency is estimated on line using a differential type algorithm.
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19. An article of manufacture comprising:
a computer storage medium having a computer program encoded therein for estimating air-charge for an engine, said computer storage medium comprising code for measuring the mass air flow through the engine throttle with a mass air flow sensor (MAF);
code for measuring the pressure in the engine intake manifold with a pressure sensor (MAP);
code for estimating the flow through the throttle based on the signal from the MAF sensor and compensating for the MAF sensor dynamics;
code for estimating the intake manifold pressure based on the signal from the MAP sensor and filtering the noise, and periodic oscillations at engine firing frequency, contained in the MAP sensor signal and the MAF sensor signals; and
code for estimating the volumetric efficiency and providing an estimate of the air flow into the engine.
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