Combustion control system for internal combustion engine
First Claim
1. A combustion control system comprising:
- ion current detecting means provided in a combustion chamber of an internal combustion engine to detect an ion current;
waveform shaping means for producing an ON signal during a time section when a detected value of said ion current is larger than a threshold value;
down timing detecting means for detecting down timings when said ON signal shifts from ON to OFF;
down time operating means for converting said down timings into down times elapsing from a reference crank angle generating time;
mask time section setting means for setting a mask time section corresponding to a combustion period in accordance with a running condition of said internal combustion engine;
combustion ending time selecting means for selecting at least one of said down times occurring within said mask time section as a combustion ending time; and
a combustion parameter determining means for determining a combustion parameter of said internal combustion engine in accordance with said combustion ending time.
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Abstract
A combustion control system includes a waveform shaping device for producing an ON signal from an ion current detected value, a down timing detecting device for detecting down timings of the ON signal, an operating device for converting the down timings into times elapsing from a reference crank angle, mask time section setting device for setting a mask time section corresponding to a combustion period in accordance with a running condition of the internal combustion engine, a selecting device for selecting at least one of said down times detected within the mask section, and a determining device for determining a combustion parameter of said internal combustion engine in accordance with the combustion ending time, whereby the combustion state of each cylinder is detected from the combustion ending time detected by the mask time section to determine the combustion parameter so as to suppress a combustion change. In this configuration, by operating a small quantity of data, an inexpensive and accurate combustion control system for an internal combustion engine can be obtained.
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Citations
9 Claims
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1. A combustion control system comprising:
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ion current detecting means provided in a combustion chamber of an internal combustion engine to detect an ion current; waveform shaping means for producing an ON signal during a time section when a detected value of said ion current is larger than a threshold value; down timing detecting means for detecting down timings when said ON signal shifts from ON to OFF; down time operating means for converting said down timings into down times elapsing from a reference crank angle generating time; mask time section setting means for setting a mask time section corresponding to a combustion period in accordance with a running condition of said internal combustion engine; combustion ending time selecting means for selecting at least one of said down times occurring within said mask time section as a combustion ending time; and a combustion parameter determining means for determining a combustion parameter of said internal combustion engine in accordance with said combustion ending time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification