Hydrogen supply device and hydrogen engine vehicle

A hydrogen engine vehicle comprising:

• a hydrogen engine that drives a vehicle;
• and
• a hydrogen supply device that supplies hydrogen gas to the hydrogen engine, wherein:
• the hydrogen supply device includes
• a liquid hydrogen pump that boosts a pressure of liquid hydrogen stored in a liquid hydrogen tank,
• a vaporizer that converts liquid hydrogen discharged from the liquid hydrogen pump into hydrogen gas,
• a pressure chamber that is filled with hydrogen gas flowing out from the vaporizer and supplies the filled hydrogen gas to the hydrogen engine, and
• a pump control unit that adjusts a discharge flow rate of the liquid hydrogen pump;
• and
• the pump control unit changes a target pressure of the pressure chamber such that the target pressure of the pressure chamber when a rotation speed of the hydrogen engine is low becomes lower than the target pressure of the pressure chamber when the rotation speed of the hydrogen engine is high, and based on a flow rate of the hydrogen gas supplied to the hydrogen engine, an actual pressure of the pressure chamber, and the rotation speed of the hydrogen engine, the pump control unit adjusts the discharge flow rate of the liquid hydrogen pump such that the actual pressure of the pressure chamber becomes the target pressure.