采取进、排气管隔热措施，降低进气温度来提高进气充量。
Adopt measure to prevent the heat transmit between intake pipe and exhaust pipe, lower the intake air temperature to increase volumetric efficiency.
试验结果表明，该系统在不影响进气充量系数的情况下，对柴油机有害气体排放量影响显著。
The test results show that, without obvious increase of volumetric efficiency, this system is able to make obvious change to the exhaust gas emission of diesel engine.
通过分析滚流进气道进气充量的动力学，提出了由传统滚流进气道和副气道组合的进气道结构。
By analyzing the kinetics of intake air flow from the tumble inlet ports, a composed inlet port configuration with a traditional tumble port and a sub-port was investigated.
结果表明，该系统在不影响进气充量系数的情况下，可以明显改变柴油机微粒和氮化物的排放量。
The test results showed that, without obvious increase of volumetric efficiency, this system is able to make obviously change to the particulate and NOx emission.
发动机采用可变气门正时技术可以提高进气充量，使充量系数增加，发动机的扭矩和功率可以得到进一步的提高。
Engine using variable valve timing technology can improve the intake charge, so that coefficient of charge increase, engine torque and power can be further improved.
发动机采用可变气门正时技术可以提高进气充量，使充量系数增加，发动机的扭矩和功率可以得到进一步的提高。
Engine using variable valve timing technology can improve the intake charge, so that coefficient of charge increase, engine torque and power can be further improved.
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