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一、四冲程发动机的示功图在研究相似示功图之前,先对四冲程发动机的示功图加以扼要说明。发动机气缸内压力P随气缸容积V变化的曲线图称作发动机的示功图,如图1所示。1.进气冲程活塞处于上止点a时(进气门在上止点前的E点已经打开),气缸中气体压力P_a稍高于
First, the four-stroke engine dynamometer diagram Before studying the similar dynamometer, the first four-stroke engine dynamometer to be briefed. The graph of the change in the cylinder pressure P of the engine with the cylinder volume V is referred to as the engine dynamometer, as shown in FIG. 1. 1. Intake stroke piston at top dead center a (intake valve before the top dead center E has been opened), the cylinder gas pressure P_a slightly higher than