<p>A control unit (53) is provided to control fuel injection operations in a first injection vale (511) and a second injection valve (521), and more particularly, to switch between fuel injection by the first injection valve and fuel injection by the second injection valve. This control unit is provided with a timing change unit (535). The timing change unit is provided so as to advance the fuel injection timing in correction injections (fuel injections immediately after switching between liquid fuel and gaseous fuel) relative to normal injections (fuel injections after correction injections).</p>
