To provide a structure and an arrangement method of piping suitable for an internal combustion engine comprising a plurality of fuel injection valves, in a multi-kind fuel supply device comprising: an oxygen sensor arranged in the internal combustion engine using a variety of kinds of fuel mixed with an alcohol and gasoline at any ratio; an air intake passage for supplying air to the internal combustion engine; the plurality of fuel injection valves for injecting an amount of the fuel corresponding to a measurement value of the oxygen sensor; a fuel supply pipe for supplying the fuel pressure-sent from a fuel pump to the fuel injection valves; and a fuel pressure adjuster.
Fuel injection valves comprise a main fuel injection valve controlled to mainly inject fuel during the operation of an internal combustion engine, and a sub-fuel injection valve controlled to inject the fuel when a temperature of an oxygen sensor reaches a prescribed temperature and the internal combustion engine is brought into a prescribed operation state. A fuel supply pipe of the main fuel injection valve is made to communicate from a fuel pressure adjuster via fuel piping through a fuel supply pipe of the sub-fuel injection valve.
KOYAMA TAKAHIRO
Nakamura Kun
Junko Kanzawa