Patent ID: 8353196

Claim:
A gas-mixture-nonuniformity acquisition apparatus for an internal combustion engine, comprising: nonuniformity acquisition means for acquiring a nonuniformity of fuel concentration within an entire gas mixture where, in a process in which a cylinder interior gas taken into a combustion chamber of the engine and fuel injected into the combustion chamber mix together within the combustion chamber to form a gas mixture, a collision reaction repeatedly takes place within the gas mixture in such a manner that, due to collision of two gas volumes having different fuel mass ratios, respective portions of the two gas volumes mix together, and the mixed portions separate from the corresponding gas volumes, respectively, and form the entirety of another gas volume having a fuel mass ratio different from those of the two gas volumes, gas-volume quantity acquisition means for acquiring quantities of two or more gas volumes located within the gas mixture and having different fuel mass ratios; and mixing volume acquisition means for acquiring a mixing volume which is a volume in which the respective portions of the collided two gas volumes mix together, wherein the gas-volume quantity acquisition means calculates decrease amounts of the quantities of the collided two gas volumes corresponding to the respective portions and an increase amount of the quantity of the another gas volume, by use of the acquired mixing volume, to thereby update and acquire the quantities of the two gas volume and the quantity of the another gas volume; and the nonuniformity acquisition means acquires the nonuniformity on the basis of the distribution of the updated and acquired quantities of the respective gas volumes.