An engine fuel delivery system is provided to raise the fuel pressure rapidly
in the initial stage of engine starting without increasing the cranking load, thereby
making it possible to achieve an atomized fuel spray through high-pressure fuel
injection, improve the fuel efficiency, and reduce emissions. The engine fuel delivery
system uses a variable transmission mechanism that is configured to change the
drive rotational ratio of a power transmission path between a crankshaft of an
engine and a high-pressure fuel pump. The variable transmission mechanism controls
the rotational speed of the high-pressure fuel pump to a rotational speed that
is higher than the normal pump rotational speed in the initial stage of engine
starting after the engine has been cranked to complete explosion.
