Engine exhaust apparatus and method

Details Engine exhaust apparatus and method Engine exhaust apparatus and method

1989-07-25

1991-05-14

Fuller, Benjamin R.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181239, 181240, 181265, 181268, 181272, 181296, 60292, 60312, 60324, F01N 108

Patent

active

050148176

ABSTRACT:
An engine exhaust apparatus in which an exhaust passageway of the engine is provided with a plurality of sound deadening passsages. One common exhaust passageway from the engine is branched into first and second exhaust passageways. Each of the first and second exhaust passageways has a silencer or muffler including first and second exhaust outlet tubes with a shift valve mounted in one of these exhaust outlet tubes. A control unit controls the shift valves to close both when engine speed is in a low region, to open one of them when engine speed is in a medium region and to open both when engine speed is in a high region.

REFERENCES:
patent: 1299326 (1919-04-01), Gray
patent: 3892071 (1975-07-01), Garcea
patent: 3908366 (1975-09-01), Masaki
patent: 4665692 (1987-05-01), Inaba
patent: 4840030 (1989-06-01), Ikeda et al.

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