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20世纪80年代以后电控发动机为了提高升功率和改善低、高转速下发动机的性能,在发动机进气系统中广泛采用进气谐波增压技术和进气共鸣控制技术。 进气谐波增压的工作原理主要是利用进气流的惯性来增压。当进气流高速流向进气门时,如果进气门突然关闭,进气门附近的气流突然停止流动,于是使进气门附近的气体被压缩,压力上升。当气流的惯性力消失时,被压缩的气体开始膨胀,向与进气流相反的方向流动,压力下降,膨胀气体的压力波传到进气管口时又被反射回来,形成脉动的压力波。谐波进气增压系统就是利用这一脉动的压力波,在进气管路设计上,使压力波与进气门的开闭相互吻合,使反射回来的压力波能集中在将要打开的进气门旁,在进气门打开时,就会产生增压效果。为
After the 1980s, the electronically controlled engine is widely used in the intake system of the engine to enhance the power and improve the performance of the engine at low and high speed. The working principle of intake harmonic booster is mainly to use the inertia of the intake air flow to boost pressure. When the intake flow flows toward the intake valve at a high speed, if the intake valve suddenly closes, the airflow near the intake valve suddenly stops flowing, so that the gas near the intake valve is compressed and the pressure rises. When the inertia force disappears, the compressed gas begins to expand and flows in the opposite direction to the intake air flow. The pressure drops and the pressure of the expanding gas propagates to the intake port and is reflected back to form a pulsating pressure wave. Harmonic intake pressurization system is the use of this pulsating pressure wave in the intake pipe design, the pressure wave and intake valve opening and closing mutual agreement, the pressure wave reflected back can be concentrated in the intake to be opened Doors, when the intake valve is open, will produce supercharged effect. for