Engine control system
First Claim
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1. A system for use with an internal combustion engine for controlling ignition timing in terms of spark advance in response to engine operating parameters, comprising:
- (a) means for measuring values of engine operating parameters including intake-manifold vacuum pressure, throttle-valve angular position, and engine speed;
(b) means for controlling said spark advance;
(c) a digital computer selectively employing a first group of measured values of intake-manifold vacuum pressure and engine speed or a second group of measured values of throttle-valve angular position and engine speed for calculating a value corresponding to a setting of said controlling means, said digital computer being operable to calculate a difference between sequential measurements made at uniform time intervals of the intake-manifold vacuum pressure and to determine if said calculated difference is within a predetermined range, said digital computer being further operable to calculate a value corresponding to a setting of said controlling means from said first group of measured values when said calculated intake-manifold vacuum pressure difference is within said predetermined range and for calculating a value corresponding to said setting of said controlling means from said second group of measured values when said calculated intake-manifold vacuum pressure difference exceeds said predetermined range.
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Abstract
An engine control system is disclosed which employs first and second load sensors providing an inference of engine load by measuring first and second engine operating parameters. The system controls one or more engine operating functions based on a measurement on the first engine operating parameter but on a measurement on the second engine operating parameter when the change of the measurement of the first engine operating parameter is out of a predetermined range.
14 Citations
10 Claims
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1. A system for use with an internal combustion engine for controlling ignition timing in terms of spark advance in response to engine operating parameters, comprising:
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(a) means for measuring values of engine operating parameters including intake-manifold vacuum pressure, throttle-valve angular position, and engine speed; (b) means for controlling said spark advance; (c) a digital computer selectively employing a first group of measured values of intake-manifold vacuum pressure and engine speed or a second group of measured values of throttle-valve angular position and engine speed for calculating a value corresponding to a setting of said controlling means, said digital computer being operable to calculate a difference between sequential measurements made at uniform time intervals of the intake-manifold vacuum pressure and to determine if said calculated difference is within a predetermined range, said digital computer being further operable to calculate a value corresponding to a setting of said controlling means from said first group of measured values when said calculated intake-manifold vacuum pressure difference is within said predetermined range and for calculating a value corresponding to said setting of said controlling means from said second group of measured values when said calculated intake-manifold vacuum pressure difference exceeds said predetermined range. - View Dependent Claims (2)
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3. A system for use with an internal combustion engine for controlling at least one engine operating function in response to engine operating parameters, comprising:
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(a) means for measuring a first engine operating parameter to provide a first inference of engine load; (b) means for measuring a second engine operating parameter to provide a second inference of engine load; (c) means for controlling said engine operating function; and (d) a digital computer selectively employing one of said first and second inferences of engine load to calculate a value corresponding to a setting of said controlling means, said digital computer being operable to calculate a difference between sequential measurements made at uniform time intervals of said first engine operating parameter and to determine if said calculated difference is within a predetermined range, said digital computer being further operable to calculate a value corresponding to a setting of said controlling means from said first inference of engine load when said calculated difference is within said first predetermined range but to calculate a setting of said controlling means from said seond inference of engine load when said calculated difference exceeds said predetermined range. - View Dependent Claims (4, 5)
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6. A method of controlling ignition timing for an internal combustion engine, comprising the steps of:
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measuring a first group of values of intake-manifold pressure and engine speed at generally uniform time intervals; measuring a second group of values of throttle position and engine speed at generally uniform time intervals; calculating a difference between sequentially measured values of intake-manifold pressure; determining whether said calculated intake-manifold pressure difference exceeds a predetermined range; selecting said first group of values when said calculated intake-manifold pressure difference is within said predetermined range and selecting said second group of values when said calculated intake-manifold pressure difference exceeds said predetermined range; and controlling ignition timing as a function of the selected group of values. - View Dependent Claims (7, 8, 9, 10)
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Specification