MULTICYLINDER ENGINE UNIT OF INDEPENDENT THROTTLE TYPE OR UNEQUAL INTERVAL COMBUSTION TYPE

WIPO Patent Application WO/2024/019150

A1

A multicylinder engine unit (1) of an independent throttle type or an unequal interval combustion type is provided with: a plurality of independent exhaust pipes (12A, 12B); an aggregate pipe (13) including a catalyst (132); a pre-catalyst oxygen sensor group (14) provided between a plurality of cylinders and the catalyst in a path for exhaust gas; a post-catalyst oxygen sensor (15) that detects the proportion of oxygen in the exhaust gas having passed through the catalyst; and a control device (16). The control device (16) is configured to detect an air-fuel ratio imbalance between cylinders in a plurality of cylinders (11A, 11B) using a detection result detected by the pre-catalyst oxygen sensor group (14), and detect degradation of the catalyst using a detection result detected by all or a part of the pre-catalyst oxygen sensor group (14) and a detection result detected by the post-catalyst oxygen sensor (15).

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KASAHARA TATSUYA (JP)
SHIMIZU YUTA (JP)
AOYAMA TATSUYA (JP)
HIRANO ATSUSHI (JP)
IWAMOTO KAZUTERU (JP)
HIDAI ATSUYA (JP)
KINOSHITA HISATOSHI (JP)

PCT/JP2023/026809

January 25, 2024

July 21, 2023

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YAMAHA MOTOR CO LTD (JP)

F02D45/00; F01N3/20; F02D35/00

JPH06200809A	1994-07-19
JPH04112949A	1992-04-14
JPH03202626A	1991-09-04
JPH03134236A	1991-06-07

TASS MEISTER IP LAW FIRM (JP)

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