Patent ID: 8596231

Claim:
An engine system comprising: an engine; a fuel tank to store a pre-reformed fuel; and a reformer to reform the pre-reformed fuel, wherein a reformed fuel which is reformed by the reformer is supplied to a cylinder of the engine, the reformer is attached to an exhaust pipe of the engine, the reformed fuel is supplied to the cylinder of the engine from an exhaust valve of the engine, an exhaust gas backflow preventer is installed in the exhaust pipe at a downstream side of the reformer, and an adjustment valve, which is adjusted to be mechanically opened at a differential pressure equal to or more than a predetermined differential pressure, is installed at a pipe to connect the fuel tank to the reformer, wherein the adjustment valve is configured to be mechanically opened under a negative pressure generated in the reformer by a suction stroke of the cylinder of the engine to supply the pre-reformed fuel from the fuel tank to the reformer.