Fuel injection control method of internal-combustion engine

Abstract

Abstract PURPOSE:To substantially improve the driving characteristic of an engine and improve the emission of its exhaust when the engine is driven in its transient operation, by using the estimated value of an intake air quantity or the like, at a point of time when injected fuel reaches a combustion chamber, so as to calculate and control an injection quantity of fuel. CONSTITUTION:A step 40 reads the updated pressure PMO in an intake pipe and pressures PM1, PM2 in the intake pipe when it is interrupted at the preceding time and that before the preceding time. A step 41 estimates the pressure PMCAL in the intake pipe at a point of time when injected fuel reaches a combustion chamber. A step 43, using the pressure PMCAL in the intake pipe, obtains a basic injection pulse width TP. When an engine is driven in its operative condition of acceleration causing the pressure in the intake pipe to increase, fuel in quantity meeting this pressure increase is supplied. In this way, a driving characteristic of the engine can be substantially improved and its exhaust emission can be improved when the engine is driven in its transient operation.

Inventors

• 👤 Hiroshi Okano
• 👤 岡野　博志

Bibliographic Details