JPH0183123U

JPH0183123U -

Info

Publication number: JPH0183123U
Application number: JP1987178972U
Authority: JP
Priority date: 1987-11-25
Filing date: 1987-11-25
Publication date: 1989-06-02

Description

[Brief explanation of the drawing]

第１図は本考案の実施例に係る車両の排気装置
の平面説明図である。第２図は開閉弁の取付け状
態説明図である。第３図は開閉弁の開または閉状
態の時の排気騒音の音圧レベル曲線特性図である
。第４図は従来における車両の排気装置の平面説
明図である。主要な部分の符号の説明、１……排気マニホー
ルド、２……８気筒Ｖ型エンジン、３……排気管
、６……連通管、７……開閉弁、８……制御手段
、９……エンジン回転数センサ。 FIG. 1 is an explanatory plan view of a vehicle exhaust system according to an embodiment of the present invention. FIG. 2 is an explanatory diagram of the installation state of the on-off valve. FIG. 3 is a sound pressure level curve characteristic diagram of exhaust noise when the on-off valve is open or closed. FIG. 4 is an explanatory plan view of a conventional exhaust system for a vehicle. Explanation of symbols of main parts, 1...Exhaust manifold, 2...8-cylinder V-type engine, 3...Exhaust pipe, 6...Communication pipe, 7...Opening/closing valve, 8...Control means, 9... Engine speed sensor.

Claims

[Scope of utility model registration request]

In a vehicle exhaust system that connects two independent exhaust pipes to an engine exhaust manifold, there is a communication pipe that connects the two exhaust pipes, an on-off valve provided in the middle of the communication pipe, and the open state of the on-off valve. The lower sound pressure of the sound pressure level curve that changes as the engine speed changes for exhaust noise when the valve is open, or the sound pressure level curve that changes as the engine speed changes for the exhaust noise when the on-off valve is open. 1. A vehicle exhaust system comprising: control means for controlling opening and closing of an on-off valve according to changes in engine speed so as to select a level curve.