目前我国内燃机设计仍以经验和类比设计为主,设计理论落后,方法仍沿用几十年前的铅笔图版式手工设计。进入90年代,由于行政主管部门的积极倡导以及市场竞争的形势所迫,对现代设计理论和方法的应用有所认识,部分大中型骨干企业已经开始行动,并期望以此获得优势,进一步提高企业素质、改进产 At present, the design of internal combustion engines in our country is still based on experience and analog design. The design theory is backward, and the method is still hand-designed with pencil drawings for several decades. In the 1990s, due to the active advocacy of the competent administrative departments and the pressure of market competition, some understanding of the application of modern design theories and methods has been recognized. Some large and medium-sized backbone enterprises have started to move forward, and they hope to gain an advantage and further improve their business. Quality, improved production