One of the main causes of the inadequate transient response of a 4-valve engine was established as being partition wall-wetting. The possibility of resolving this problem by improving fuel atomization was investigated. An air-mix type injector, although producing finer droplets with more uniform distribution, was not found effective in improving transient response.The development of a two-hole injector is described. This new injector produces twin sprays which are directed into the siamese intake ports without wetting the partition wall. As a consequence, the lean A/F ratio excursion is reduced, torque stumble is eliminated and the conversion efficiency of a three-way catalyst is increased.
Two-hole Injector Improves Transient Performance and Exhaust, Emissions of 4-valve Engines
Sae Technical Papers
SAE International Congress and Exposition ; 1987
1987-02-01
Conference paper
English
Two hole Injector Improves Transient Performance and Exhaust Emissions of 4-valve Engines
Automotive engineering | 1987
|Toyota Air-Mix Type Two-Hole Injector for 4-Valve Engines
SAE Technical Papers | 1991
|Toyota air-mix type two-hole injector for 4-valve engines
Automotive engineering | 1991
|Performance and Exhaust Emissions of a Diesel Engine Equipped with Dual Injector System
British Library Online Contents | 2017
|Lean burn engines for low exhaust emissions
Automotive engineering | 1986
|