Abstract: The introduction of the feed method of natural gas in the double fuel engine of the natural gas/Diesel by the technique of electronically controlled gas injection makes the engine have better performance in power,economy and emission.The injection pressure and phase position of natural gas have a great effect on the performance of engine.The article presents the study of the injection pressure and phase position of the double fuel engine of the natural gas/diesel.

Key words: double fuel, gas injection phase position, gas injection pressure