Patent ID: 9551287
Date: 2017-01-24
CPC Classifications: F02D,F02M,G01M,Y02T

Claim:
1. An internal combustion engine control apparatus to be applied to an internal combustion engine including an exhaust gas recirculation scheme in which part of an exhaust gas of the engine is to be circulated into an air intake system, the apparatus comprising: a parameter acquiring section to acquire an air intake parameter to intake air including an intake oxygen molar concentration and a fuel parameter to relate to fuel injection; a first estimating section to estimate an in-fuel-spray air excess ratio to comprise an air excess ratio within a fuel spray to be substantially in accordance with the air intake parameter and the fuel parameter; a first determining section to determine whether or not the in-fuel-spray air excess ratio is equal to or higher than a preset predetermined target in-fuel-spray air excess ratio; a pressure calculating section to calculate, if the in-fuel-spray air excess ratio is determined to be less than the target in-fuel-spray air excess ratio, a necessary fuel injection pressure to match the in-fuel-spray air excess ratio with the target in-fuel-spray air excess ratio; and a second determining section to determine whether or not the necessary fuel injection pressure is equal to or less than a preset maximum injection pressure, a second estimating section to estimate, if the second determining section determines that the necessary fuel injection pressure exceeds the maximum injection pressure, an in-fuel-spray air excess ratio if the maximum injection pressure is set as the fuel injection pressure; and an oxygen molar concentration calculating section to calculate a necessary intake oxygen molar concentration to match the in-fuel-spray air excess ratio to be estimated by the second estimating section with the target in-fuel-spray air excess ratio, wherein if the necessary fuel injection pressure is determined to be equal to or less than the maximum injection pressure, fuel injection is to be performed at the necessary fuel injection pressure, wherein if the necessary fuel injection pressure is determined to exceed the maximum injection pressure, fuel injection is to be performed at the maximum injection pressure and the amount of exhaust gas to be circulated into the air intake system is to be controlled based on the necessary intake oxygen molar concentration.