| 摘要 |
PROBLEM TO BE SOLVED: To perform low-cost and highly precise EGR control through rational constitution. SOLUTION: This control device is formed such that an exhaust gas return pipe 7 is connected throughout an intake pipe 2 connected to an engine 1 and an exhaust pipe 6 and an exhaust gas flow rate regulating valve 8 is interposed in the exhaust gas return pipe 7. A concentration sensor 9 to detect concentration of a carbon dioxide in mixture gas generated such that combustion exhaust gas is mixed in air and fuel is interposed in a position situated downstream from a connection spot between the intake pipe 2 and the exhaust gas return pipe 7. Based on a compression ratio, an engine load, the number of revolutions of an engine, and an air ratio, target concentration of a carbon dioxide in mixture gas is sampled. A target opening by which detecting concentration of a carbon dioxide detected by the concentration sensor 9 is adjusted to target concentration is computed and the exhaust gas flow rate regulating valve 8 is regulated such that the opening is adjusted to a target value.
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