Control system for and method of controlling an internal combustion engine
First Claim
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1. A method of controlling an internal combustion engine of a predetermined type, said method comprising the steps of:
- determining a first distribution of actual engine control parameters corresponding to at least a first demanded engine control parameter supplied to a first plurality of internal combustion engines of said predetermined type;
determining a second distribution of second demanded engine control parameters supplied to a second plurality of internal combustion engines of said predetermined type, where, above said second demanded engine control parameter, processes in the internal combustion engines of the second plurality of engines become unacceptable;
determining a limit value as a magnitude of engine control parameters at an intersection of said first and second distributions;
establishing a base value of said engine control parameter used in a combustion process occurring in the internal combustion engine of said predetermined type;
detecting when the combustion process becomes unacceptable;
applying a correction to said base value upon detecting that the combustion process has become unacceptable, said correction being applied in a direction which makes the combustion process more acceptable; and
limiting in magnitude said correction to the limit value.
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Abstract
A control system is provided for controlling the composition of a gas and fuel mixture supplied to an internal combustion engine. The output of an engine roughness detector (spark ignition engine) or an exhaust smoke detector (compression ignition engine) is compared with a limit value to provide a correction to a base value of mixture composition from a look up table. The magnitude of the correction is limited to a predetermined value and the corrected base value controls the composition of the mixture supplied to the engine.
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22 Claims
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1. A method of controlling an internal combustion engine of a predetermined type, said method comprising the steps of:
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determining a first distribution of actual engine control parameters corresponding to at least a first demanded engine control parameter supplied to a first plurality of internal combustion engines of said predetermined type; determining a second distribution of second demanded engine control parameters supplied to a second plurality of internal combustion engines of said predetermined type, where, above said second demanded engine control parameter, processes in the internal combustion engines of the second plurality of engines become unacceptable; determining a limit value as a magnitude of engine control parameters at an intersection of said first and second distributions; establishing a base value of said engine control parameter used in a combustion process occurring in the internal combustion engine of said predetermined type; detecting when the combustion process becomes unacceptable; applying a correction to said base value upon detecting that the combustion process has become unacceptable, said correction being applied in a direction which makes the combustion process more acceptable; and limiting in magnitude said correction to the limit value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for controlling an internal combustion engine of a predetermined type by means of varying an engine control parameter where an internal combustion process of such engine becomes unacceptable at some value of said engine control parameter, said apparatus comprising:
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means for establishing a base value of said engine control parameter used in a combustion process occurring in said internal combustion engine of said predetermined type; means for detecting when said combustion process becomes unacceptable; means, responsive to said means for detecting, for applying a correction to said base value when said combustion process has become unacceptable, said correction being applied in a direction which makes the combustion process more acceptable; means for limiting in magnitude said correction applied by said applying means, to a limit value, said limiting means including means for storing a limit value which is a magnitude of said engine control parameter at an intersection of first and second distributions, said first distribution comprising actual engine control parameters corresponding to demanded engine control parameters for a first plurality of engines of said predetermined type, and said second distribution comprising second demanded engine control parameters of a magnitude above which magnitude processes in said internal combustion engines become unacceptable. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification