ELECTRONIC FUEL INJECTION e2.7.4 Common Rail Injection System(CR System) All previous injection systems have one disadvantage in common(Fig. 2-30): the pressure generation and the supply of the injection quantity are not mutually independent. the result is that the injection pressure increases with the engine speed and also increases during injection( approximately linearly). Consequently, smaller injection quantities are injected with low pressure the peak pressure is almost twice as high as the average injection pressure, which is responsible for the quality of the fuel swirl in the combustion chamber be responsible for对.负责,是.的主要原因,决定着2.7.4 Common Rail Injection System (CR System) All previous injection systems have one disadvantage in common (Fig. 2-30): the pressure generation and the supply of the injection quantity are not mutually independent. The result is that the injection pressure increases with the engine speed and also increases during injection ( approximately linearly). Consequently, smaller injection quantities are injected with low pressure. The peak pressure is almost twice as high as the average injection pressure, which is responsible for the quality of the fuel swirl in the combustion chamber. ELECTRONIC FUEL INJECTION be responsible for 对…负责，是…的主要原因，决定着