Intake system for engine

Details Intake system for engine Intake system for engine

Filed on

1991-05-16

Date issued

1992-01-14

Examiner

Okonsky, David A.

Patent Class

Internal-combustion engines

SubClass

Multiple cylinder

Other Related Categories

123 52ML, F02M 3510

Type

Patent

Status

active

Patent number

050800515

Description

ABSTRACT:
A multiple-cylinder engine has first and second groups of cylinders, the firing order being set so that the cylinders in each group do not fire one after another. An intake system for the engine has first and second groups of discrete intake passages which communicate with the respective cylinders in the first and second groups at their downstream ends and with first and second branch intake passage at their upstream ends. A circular passage communicates with the discrete intake passages at their intermediate portions so that all the discrete intake passages communicate with each other through the circular passage, and an on-off valve opens the circular passage when the engine speed is higher than a predetermined value and closes the same when the engine speed is not higher than the predetermined value. The length of each discrete intake passage is such that a first inertia tuning is obtained at a first engine speed lower than a maximum allowable engine so long as the discrete intake passages are not communicated with the circular passage, and the length of the part of each discrete intake passage downstream of the circular passage is such that a second inertia tuning is obtained at a second engine speed higher than the maximum allowable engine so long as the discrete intake passages are communicated with the circular passage.

REFERENCES:
patent: 4615324 (1986-10-01), Choushi et al.
patent: 4619226 (1986-10-01), Ueda et al.
patent: 4829941 (1989-05-01), Hitomi et al.
patent: 4846117 (1989-07-01), Hitomi et al.

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