Automobile muffler

Abstract

The invention relates to an automobile muffler. The tail pipe of the automobile is respectively provided with a throttle valve and a stepping motor, wherein the throttle valve is driven by the motor, the motor is electrically connected with the electronic control unit of an engine, and the motor converts the rotation speed electric signal of the engine into a displacement signal, thereby driving the throttle valve to control the opening of the throttle valve. Since the throttle valve of the variable-displacement exhauster can track the variation of the engine rotation speed all the way so as to obtain the optimal control, so that the exhaust noise and the output power of the engine are better unified. The automobile muffler has the advantages of low cost and convenient installation, and is free from the restriction of assembly space.

Description

technical field [0001] The invention relates to an automobile muffler device, in particular to an automobile muffler device capable of intelligently adjusting exhaust flow. Background technique [0002] Automobile exhaust system refers to the combination of various components from the engine exhaust manifold to the exhaust tailpipe. Generally, it includes Y-shaped pipe, three-way catalyst, flexible pipe, front muffler, rear muffler, intermediate connecting pipe, tail pipe, hook, hook vibration isolator and other components. The main function of the muffler is to treat exhaust gas and reduce noise. According to the principle of noise reduction, mufflers can be mainly divided into two types: resistance type and resistance type. The resistance muffler uses the sound resistance effect generated by the sound-absorbing material laid on the wall of the air flow channel of the muffler to eliminate sound. The anti-type muffler uses the sudden expansion or contraction of the pipe se...

AI Technical Summary

Problems solved by technology

[0006] There is a problem here, if the diameter of the exhaust pipe is small, the flow velocity will be accelerated at low engine speed, and the air noise will be reduced, which is beneficial to keep the tailpipe noise at a low level; but at high engine speed, the flow velocity will be faster and the friction noise will be significant increase to keep tailpipe noise at a high level

Conversely, if the diameter of the exhaust pipe is larger, although the friction noise is reduced at high speed, the air noise is significantly increased at low speed, so there are always insurmountable shortcomings when the diameter of the exhaust pipe is large or small.

[0007] In the prior art, there is also a dual exhaust system, which is beneficial to reduce the tailpipe noise at high engine speeds, but this will increase the cost and be limited by the assembly space, and the noise will increase at low engine speeds

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