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Engine exhaust system, engine and vehicle

An exhaust system and engine technology, applied to engine components, machines/engines, exhaust devices, etc., can solve the problems of reducing exhaust noise and failing to improve engine low-speed torque, so as to reduce exhaust noise and improve power performance , Improve the effect of low-speed torque

Active Publication Date: 2018-06-29
SAIC MOTOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The problem solved by the present invention is: the prior art fails to improve the low-speed torque of the engine and reduce the exhaust noise at the same time

Method used

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  • Engine exhaust system, engine and vehicle
  • Engine exhaust system, engine and vehicle
  • Engine exhaust system, engine and vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] In the prior art, after the muffler is arranged on the exhaust pipe, when the engine rotates at a low speed, the exhaust back pressure at the outlet of the exhaust valve is large; when the engine rotates at a high speed, the exhaust pipe exhaust back pressure is large. The front muffler of the present invention utilizes the principle of resonance, and when the engine rotates at a low speed, the exhaust back pressure at the outlet of the exhaust valve decreases; at the same time, when the engine rotates at a high speed, the exhaust back pressure of the exhaust pipe also decreases.

[0042] In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0043] Power performance is a core evaluation index of the engine. According to the engine principle, increasing the intake air density and charge coeffic...

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PUM

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Abstract

The invention discloses an engine exhaust system, an engine and a vehicle. The engine exhaust system comprises a silencing cavity, and a first pipeline, a second pipeline and a third pipeline providedwith reversing pieces; one end of the second pipeline and one end of the third pipeline both communicate with the silencing cavity, and the other ends are both connected with the reversing pieces; the second pipeline is longer than the third pipeline; and the length sum of the second pipeline and the first pipeline meets the following conditions: waste gas exhausted by an exhaust door generates resonance with exhaust pressure reflecting waves in an outlet of the second pipeline and exhaust waves at the closing moment of the exhaust door. The exhaust system improves low-speed torque of the engine, meanwhile, improves the dynamic property of the engine in high-speed phase, and reduces the exhaust noise.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to an engine exhaust system, an engine and an automobile. Background technique [0002] For automobiles, it is hoped that the low-speed torque of the engine can be improved while reducing the exhaust noise of the engine. [0003] Among them, the low-speed torque of the engine has a great influence on the acceleration of the car, which can directly affect the customer's feeling of the power of the vehicle. Therefore, improving the low-speed torque of the engine can make automotive products gain more customers' favor in the increasingly fierce automotive market, and improve product performance and competitiveness. In reality, passenger cars are faced with many urban conditions, and frequent start-stop and acceleration / deceleration conditions occupy a large part of the vehicle's service time. Therefore, it is necessary to increase the low-speed torque of the engine. [0004] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N1/02F01N13/10
CPCF01N1/02F01N13/10
Inventor 陈立锋刘旻叶敬安赖郭晖宋涛
Owner SAIC MOTOR
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