Control method for a fuel injection engine

Abstract

Abstract The fuel injection quantity required for maintaining the air-fuel ratio of the mixture supplied to each cylinder of an engine (10) at a desired value is determined by calculating from sensor data a deposition rate X at which injected fuel deposits and forms film mass on an intake manifold wall (21) of the engine and a vaporization rate 1/ T at which the film mass vaporizes from the manifold wall, calculating a current film mass quantity M, from the calculated X and 1/ T and the fuel quantity by the preceding injection, calculating a desired fuel quantity Q a /(A/F) to be supplied to the cylinder from an intake air flow Q. and a desired air-fuel ratio A/F and determining a current fuel injection quantity G f from the calculation results in accordance with the following equation Also, an accurate film mass quantity estimation is accomplished by subtracting a calculated value of a carry-over fuel quantity to be delivered to the cylinder from the film mass quantity estimated during the preceding period and adding a calculated value of a wall deposition fuel quantity per period obtained on the basis of an actual fuel injection quantity per stroke of the engine to the remaining film mass quantity thereby estimating a current film mass quantity.

Inventors

• 👤 Teruji Sekozawa
• 👤 Makoto Shioya
• 👤 Motohisa Funabashi
• 👤 Mikihiko Onari
• 👤 Masami Shida

Bibliographic Details