Difference between throttle valve and intake valve

1. The throttle valve is installed on the intake branch pipe, and the intake valve, commonly known as the throttle valve, is controlled by the accelerator pedal to control the intake.

2. The intake valve is controlled by the piston and camshaft of the engine, and its function is to open the intake valve and let air flow into the cylinder.

3. The function of exhaust valve is to discharge waste gas.

Second, the installation location is different.

1. The throttle valve is installed on the intake branch pipe.

2. The intake valve is installed on the engine.

3. The exhaust valve is installed at the rear of the car.

Extended data:

Noise reduction measures of air intake system

The treatment methods of airflow noise and structural noise are relatively simple, and they are often not the main noise of the intake system. This paper mainly discusses the noise reduction measures of low frequency noise.

(1) Reasonable design of air filter. Generally speaking, the larger the volume of noise elimination, the better the noise elimination effect, but the layout space, the weight of parts and the cost of parts should also be considered comprehensively. In general, the volume of air filter is more than 3 times that of engine, which can achieve good noise reduction effect.

(2) Determine the diameter and length of the air inlet and exhaust pipes of the air cleaner. Reducing the diameter of intake and exhaust pipe of air cleaner and increasing the expansion ratio will help to reduce noise, but it will increase the resistance of intake system, reduce the intake air volume of engine and affect engine performance. The effective noise elimination frequency of air filter is related to the length of air duct. Increasing the length of intake pipe will make the effective noise elimination frequency of air filter shift to low frequency, so it is necessary to design the length of intake pipe and outlet pipe reasonably.

(3) Reasonable design of silencing elements. Commonly used silencing elements include resonant cavity, 1/4 wavelength tube, porous tube, braided tube, etc. Resonators are generally aimed at low frequencies, 1/4 wavelength tubes are generally used to eliminate middle and high frequency noise, and porous tubes and braided tubes are mainly used to eliminate noise with wide frequency band.

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