| 摘要 |
PROBLEM TO BE SOLVED: To determine an upper limit quantity of an injection quantity of fuel for combustion at which excessive noise caused by HCCI (Homogeneous Charge Compression Ignition) combustion can be suppressed in a fuel injection quantity control device adopted to an internal combustion engine capable of injecting fuel for HCCI combustion and fuel for diffusion combustion at the same cycle. SOLUTION: This fuel injection quantity control device determines the upper limit quantity of the fuel injection quantity qhcci for HCCI combustion as a smaller value by using a linear function funcqhccimax assuming that a temperature in a cylinder becomes higher as a total demand fuel injection quantity qfin is larger, and controls the fuel injection quantity qhcci for HCCI combustion so that a fuel concentration in a homogeneous charge air fuel mixture becomes smaller. Noise by the HCCI combustion becomes higher as HCCI combustion reaction speed becomes higher. Accordingly, a reaction speed of HCCT combustion is presented from exceeding upper limit reaction speed corresponding to an upper limit of a range in which the noise is not excessively high since fuel injection quantity qhcci for HCCI combustion is controlled as above. COPYRIGHT: (C)2009,JPO&INPIT
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