汽车技术发展主要围绕能源、环保、安全3大问题进行的,其中能源问题尤为突出,可以说是汽车工业发展与变革的动力。节约能源首先是提高燃油经济性,而降低车辆自质量是提高燃油经济性的一项重要措施。对轿车而言,每减轻自质量10%,燃油消耗可降低8%～10%;对载货车(16～20t级)而言, The development of automobile technology mainly focuses on three major issues of energy, environmental protection and safety. Among them, the energy problem is particularly prominent, which can be said to be the driving force for the development and reform of the automobile industry. Energy conservation first of all is to improve fuel economy, while reducing vehicle self-quality is an important measure to improve fuel economy. For cars, every 10% reduction in mass can reduce fuel consumption by 8% -10%; for trucks (16-20 t)