在电控汽油机参数未作任何调整的情况下，实验研究了汽油机燃用乙醇汽油对发动机经济性和动力性的影响。研究表明：电控汽油机改燃乙醇汽油后，部分负荷时汽油机的功率和转矩有所降低，但全负荷时汽油机的动力输出不变；与普通汽油相比，乙醇汽油的燃油消耗率增加5%-10%，而且汽油机的经济区范围变窄；但能耗率会有所改善，在怠速工况下，乙醇汽油会降低汽油机的CO、HC和NO2排放；乙醇汽油对汽油机性能的影响与空燃比控制策略有关。

This paper presents a dual fuel system for diesel-natural gas operation for a truck diesel engine, and describes results of testing and analysis of the operating characteristics of the engine. The research results show that rates of fuel consumption and fuel efficiencies are increased with this engine design, and heat consumption decreased with increasing load on the engine. The heat consumption rates at medium-high loads are lower than at light loads. At full loads, the dual fuel engine exhibits heat release in which start combustion is reduced and the following combustion is rapid. The engine is tested with an electronically controlled method to meet the requirement of engine output torque.

Natural gas engines have widely been developed in the world because of the decrease of oil resources and strictness of the exhaust regulations. This paper introduces the main processes of designing diesel engines fuelled with natural gas and ignited by spark plugs. Secondly, it analyzes a number of problems considered during the process of designing. As an example, authors introduce the characteristic of a natural gas engine converted from a 4125 diesel engine and discuss the performances of the prototype engine according to results of the engine bed testing .The result is satisfying.

介绍了一种新的电控共轨式燃油喷射系统。该系统根据各种液化代用燃料的特殊性质，采用电子控制技术和共轨式喷射原理，能够满足多种液化代用燃料在发动机上应用的要求。同时研究了这种系统的喷射特性，并以柴油为燃料进行了发动机台架试验，验证了系统的可行性。

This paper reports the development of a new prechamber combustion system of the 2190T natural gas engine. The experimental results show that the new combustion system is reliable and practical, and that the performance of the engine is greatly improved due to stable ignition and fast flame propagation in prechamber and high burning rate and short burning period in main chamber.