Intake system for multiple-cylinder engine

Details Intake system for multiple-cylinder engine Intake system for multiple-cylinder engine

1988-09-28

1989-12-26

Okonsky, David A.

Internal-combustion engines

Multiple cylinder

123 52MC, F02B 2700

Patent

active

048890820

ABSTRACT:
An intake system for a multiple-cylinder engine has first and second branch passages, a plurality of discrete intake passages for connecting the cylinders to one of the first and second branch passages, an intake air supply passage, an upstream side communicating passage for communicating the first and second branch passages with each other and with the downstream end of the intake air supply passage, and a downstream side communicating passage for communicating the downstream side ends of the first and second branch passages with each other. The firing order is set so that the cylinders connected to each of the branch passages do not fire one after another. The first and second branch passages and the upstream side and downstream side communicating passages forming a circular passage for supercharging the engine by resonance tuning effect of intake air. The downstream side communicating passage is provided with a cross-sectional area changing means for changing the effective cross-sectional area of the downstream side communicating passage according to the engine speed to increase the effective cross-sectional area of the downstream side communicating passage with increase in the engine speed.

REFERENCES:
patent: 4440120 (1984-04-01), Butler
patent: 4649871 (1987-03-01), Hatamura et al.
patent: 4708097 (1987-11-01), Hatamura et al.
patent: 4736714 (1988-04-01), Hokazono et al.
patent: 4738229 (1988-04-01), Wada et al.
patent: 4766853 (1988-08-01), Iwanami

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