FLYWHEEL DEVICE

PURPOSE:To improve an engine acceleration quality without damaging a rotation change quality at an engine low rotation sphere, by controlling, on the basis of an engine rotation setting value and an engine rotation number, the speed reduction ratio of a transmission between a crank shaft and a flywheel. CONSTITUTION:A flywheel 11 is fitted to a crank shaft 6 through a transmission 12. Given that the speed reduction ratio of the transmission 12 is i and an engine rotation setting value by means of the stepping on of an accelerator is No and an engine rotation number is Ne, a controller 15 conducting the control of iproportional No-Ne is connected to the transmission 12. As a result, when the difference between the engine rotation setting value No by acceleration and the engine rotation number Ne is small under the idling operation of the engine, the ratio of speed reduction is small, and a stable rotation with little change is obtained. Next, in the case of the accelerator being stepped on and acceleration having been made, deflection No-Ne becomes large, and with this, the ratio of speed reduction i becomes large, and the inertia moment added on the engine becomes small, so the acceleration quality of the engine is improved.