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Patent Searching and Data


Title:
FOUR-CYLINDER ENGINE AND OPERATING METHOD FOR FOUR-CYLINDER ENGINE
Document Type and Number:
WIPO Patent Application WO/2015/104831
Kind Code:
A1
Abstract:
This four-cylinder engine is equipped with a cylinder body (3), a cylinder head (4), and an ignition device (27) that includes spark plugs (14). The engine is equipped with an intake device (16) that is connected to intake ports (9), an exhaust device (23) that is connected to exhaust ports (10), four pistons (6), and a crankshaft (8) that is connected to the pistons (6) via connecting rods (7). Explosion intervals of the four cylinders are 270 degrees, 180 degrees, 90 degrees, and 180 degrees in terms of crank angle. The engine is further equipped with a discomfort elimination section (35) that, when the engine speed is lower than a prescribed value, causes the indicated mean effective pressure of at least one of two cylinders that have explosion intervals that are 90 degrees with respect to each other to be lower than the indicated mean effective pressure of the other cylinders that have explosion intervals that are not 90 degrees with respect to each other. Thus provided is a four-cylinder engine that has irregular explosion intervals yet produces little change in driving energy per unit time when in an operating state in which an occupant is more liable to feel fluctuations in torque.

Inventors:
TSUKAHARA,Ei (2500Shingai,Iwata-sh, Shizuoka 01, 〒4388501, JP)
TANAKA,Daijiro (2500Shingai,Iwata-sh, Shizuoka 01, 〒4388501, JP)
Application Number:
JP2014/050304
Publication Date:
July 16, 2015
Filing Date:
January 10, 2014
Export Citation:
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Assignee:
YAMAHA HATSUDOKI KABUSHIKI KAISHA (2500, ShingaiIwata-sh, Shizuoka 01, 〒4388501, JP)
International Classes:
F02B75/18; F02B77/00; F02D9/02; F02D13/02; F02P5/15
Foreign References:
JP2006249998A2006-09-21
JPH0972232A1997-03-18
JP2001041084A2001-02-13
JP2008014194A2008-01-24
JP4533846B22010-09-01
Other References:
See also references of EP 3093466A4
Attorney, Agent or Firm:
YAMAKAWA,Masaki et al. (4th FloorSanno Park Tower,11-1,Nagatacho 2-chome,Chiyoda-k, Tokyo 04, 〒1006104, JP)
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