Arithmetic unit for determining a target position for a throttle of an internal combustion engine
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United States of America Patent
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Jul 30, 1996
Issued Date -
N/A
app pub date -
Jun 21, 1995
filing date -
May 21, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention refers to a map for operation. The map of the invention represents an absolute value TDST of a difference between a first valve opening ratio TAM of a main throttle valve (35) and a second valve opening ratio TAS of a sub-throttle valve (37) plotted against a restriction value TA, which is the smaller of TAM and TAS. A conventional map requires a high precision around a line of TAM=TAS, that is, in the whole area of the map. The map of the invention, on the other hand, requires a high precision only in a specific range of the absolute value TDST, and allows sparse graduations of the map in an area other than the specific range. This effectively reduces data volume of the map and allows quick reference of the map. More specifically, the present invention determines a corresponding single-valve opening ratio TAA of a dual-valve throttle unit according to the first valve opening ratio TAM of the main throttle valve (35) and the second valve opening ratio TAS of the sub-throttle valve (37) by referring to the map. This method can reduce data volume of the map with out lowering the precision of operation.
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