Engine control system and method
First Claim
1. A control system for an internal combustion engine comprising a variable volume combustion chamber, an air/fuel charging system for delivering a fuel/air charge to said combustion chamber, an exhaust system discharging a burnt charge from said combustion chamber, an output shaft driven by the combustion in said engine, a combustion condition sensor for sensing the air/fuel ratio in said combustion chamber;
- a sensor for sensing the variations in speed of said output shaft at two points in less than one complete revolution of said output shaft, and feedback control means for varying the air/fuel ratio supplied by said air/fuel charging system to said combustion chamber in response to the output of said combustion condition sensor and modifying the control based upon the sensed speed variation by computing an air flow volume from the measured speed difference.
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Accused Products
Abstract
An improved feedback control system for an engine that employs only a single sensor associated with only one cylinder of the engine. Cylinder-to-cylinder adjustments are made based upon measurement of the differences in crankshaft speed during a portion of the compression stroke for each cylinder so as to provide an accurate indication of air flow to the individual cylinders.
39 Citations
20 Claims
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1. A control system for an internal combustion engine comprising a variable volume combustion chamber, an air/fuel charging system for delivering a fuel/air charge to said combustion chamber, an exhaust system discharging a burnt charge from said combustion chamber, an output shaft driven by the combustion in said engine, a combustion condition sensor for sensing the air/fuel ratio in said combustion chamber;
- a sensor for sensing the variations in speed of said output shaft at two points in less than one complete revolution of said output shaft, and feedback control means for varying the air/fuel ratio supplied by said air/fuel charging system to said combustion chamber in response to the output of said combustion condition sensor and modifying the control based upon the sensed speed variation by computing an air flow volume from the measured speed difference.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of controlling an internal combustion engine comprising a variable volume combustion chamber, an air/fuel charging system for delivering a fuel/air charge to said combustion chamber, an exhaust system discharging a burnt charge from said combustion chamber, an output shaft driven by the combustion in said engine, said method comprising the steps of sensing the air/fuel ratio in said combustion chamber;
- sensing the variations in speed of said output shaft at two points in less than one complete revolution of said output shaft, and varying the air/fuel ratio supplied by said air/fuel charging system to said combustion chamber in response to the sensed air/fuel ratio and modifying the control based upon the sensed speed variation by computing an air flow volume from the measured speed difference.
- View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
Specification