一、引言近年来,对载货汽车用柴油机质量的要求大为提高。柴油机必须具有良好的基本技术性能、满足环境要求、高的可靠性和低的成本。燃油消耗、机油消耗、修理费用和故障时间损失费用决定性地影响着运输效益。为此,发动机厂非常重视燃油消耗和机油消 I. INTRODUCTION In recent years, the requirements on the quality of diesel engines used in trucks have greatly increased. Diesel engines must have good basic technical performance, meet environmental requirements, high reliability and low cost. Fuel consumption, oil consumption, repair costs and loss of time and loss of critical decisive impact on transport efficiency. To this end, the engine plant attaches great importance to fuel consumption and oil consumption