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In an internal combustion engine using hydrocarbon fuel and hydrogen gas as fuels and including a fuel injection device that injects liquid fuel, a hydrogen-blended fuel in which hydrogen gas is contained in the form of minute bubbles in a liquid hydrocarbon fuel, that is supplied to the fuel inject

In an internal combustion engine using hydrocarbon fuel and hydrogen gas as fuels and including a fuel injection device that injects liquid fuel, a hydrogen-blended fuel in which hydrogen gas is contained in the form of minute bubbles in a liquid hydrocarbon fuel, that is supplied to the fuel injection device. The hydrogen-blended fuel is stored in a fuel tank. Hydrogen gas that has escaped from the hydrogen-blended fuel in the fuel tank is fed to a minute-bubble producing device, which forms the fuel gas into minute bubbles and mixes the minute bubbles back into the hydrogen-blended fuel.

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1. A hydrogen-using internal combustion engine, comprising: a fuel injection device that injects a liquid fuel, anda fuel supplying device that supplies the fuel injection device with a hydrogen-blended fuel as the liquid fuel, in which hydrogen gas is contained in the form of minute bubbles in a li

1. A hydrogen-using internal combustion engine, comprising: a fuel injection device that injects a liquid fuel, anda fuel supplying device that supplies the fuel injection device with a hydrogen-blended fuel as the liquid fuel, in which hydrogen gas is contained in the form of minute bubbles in a liquid hydrocarbon fuel. 2. A hydrogen-using internal combustion engine as defined in claim 1, wherein the fuel supplying device comprises a fuel tank in which the hydrogen-blended fuel is stored, and a mixing device that forms hydrogen gas that has escaped from the hydrogen-blended fuel in the fuel tank into minute bubbles and mixes the minute bubbles of the hydrogen gas back into the hydrogen-blended fuel. 3. A hydrogen-using internal combustion engine as defined in claim 2, wherein the mixing device mixes the escaped hydrogen gas back into the hydrogen-blended fuel during supply of the hydrogen-blended fuel to the fuel injection device, in a fuel supply passage that connects the fuel tank with the fuel injection device. 4. A hydrogen-using internal combustion engine as defined in claim 2, wherein the mixing device mixes the escaped hydrogen gas back into the hydrogen-blended fuel circulating in a fuel circulation passage through which the hydrogen-blended fuel delivered from the fuel tank returns to the fuel tank. 5. A hydrogen-using internal combustion engine as defined in claim 1, wherein the fuel supplying device comprises a fuel tank in which the liquid hydrocarbon fuel is stored, a hydrogen producing device that produces hydrogen gas from the hydrocarbon fuel in the fuel tank, and a mixing device that forms the hydrogen gas produced from the hydrocarbon fuel into minute bubbles and mixes the minute bubbles of the hydrogen gas into the hydrocarbon fuel. 6. A hydrogen-using internal combustion engine as defined in claim 5, wherein the mixing device mixes the hydrogen gas produced from the hydrocarbon fuel into the hydrocarbon fuel during supply of the hydrogen-blended fuel to the fuel injection device, in a fuel supply passage that connects the fuel tank with the fuel injection device. 7. A hydrogen-using internal combustion engine as defined in claim 5, wherein the mixing device mixes the hydrogen gas produced from the hydrocarbon fuel into the hydrocarbon fuel that is circulating in a fuel circulation passage through which the hydrocarbon fuel delivered from the fuel tank returns to the fuel tank. 8. A hydrogen-using internal combustion engine as defined in claim 5, further comprising a regenerating system that recovers deceleration energy of a vehicle to provide electric energy, wherein the hydrogen-producing device produces hydrogen gas from the hydrocarbon fuel by utilizing the deceleration energy recovered by the regenerating device. 9. A hydrogen-using internal combustion engine as defined in claim 1, wherein: the fuel supplying device comprises a storage device that accommodates a liquid hydride, a hydrogen producing device that produces hydrogen gas from the liquid hydride stored in the storage device, and a hydrogen mixing device that mixes the hydrogen gas produced by the hydrogen producing device into the liquid fuel supplied to the fuel injection device;a controller is provided for determining whether it is necessary to supply hydrogen gas to the internal combustion engine, and to activate the hydrogen producing device and the hydrogen mixing device when it is determined that it is necessary to supply hydrogen gas to the internal combustion engine. 10. A hydrogen-using internal combustion engine as defined in claim 9, wherein the hydrogen mixing device produces minute bubbles of the hydrogen gas, and mixes the minute bubbles of the hydrogen gas into the liquid fuel. 11. A hydrogen-using internal combustion engine as defined in claim 9, wherein the controller determines whether it is necessary to supply the hydrogen gas to the internal combustion engine, based on operating conditions of the engine. 12. A hydrogen-using internal combustion engine as defined in claim 9, wherein the controller determines whether it is necessary to supply the hydrogen gas to the internal combustion engine, based on the properties of the liquid hydrocarbon fuel. 13. A hydrogen-using internal combustion engine as defined in claim 9, wherein the controller determines whether it is necessary to supply the hydrogen gas to the internal combustion engine, based on atmospheric conditions. 14. A hydrogen-using internal combustion engine as defined in claim 9, wherein the controller determines whether it is necessary to supply the hydrogen gas to the internal combustion engine, based on conditions of a catalyst disposed in an exhaust passage of the internal combustion engine. 15. A hydrogen-using internal combustion engine as defined in claim 9, the controller determines a required amount of hydrogen to be mixed into the liquid fuel when it is determined that it is necessary to supply the hydrogen gas to the internal combustion engine, wherein the controller causes the hydrogen-producing device to produce hydrogen gas in accordance with the required amount of hydrogen. 16. A hydrogen-using internal combustion engine as defined in claim 15, wherein the controller determines the required amount of hydrogen to be mixed, based on operating conditions of the internal combustion engine. 17. A hydrogen-using internal combustion engine as defined in claim 15, wherein the controller determines the required amount of hydrogen to be mixed, based on the properties of the liquid hydrocarbon fuel. 18. A hydrogen-using internal combustion engine as defined in claim 15, wherein the controller determines the required amount of hydrogen to be mixed, based on atmospheric conditions. 19. A hydrogen-using internal combustion engine as defined in claim 15, wherein the controller determines the required amount of hydrogen to be mixed, based on conditions of a catalyst disposed in an exhaust passage of the internal combustion engine. 20. A control system of a hybrid vehicle including the hydrogen-using internal combustion engine of claim 14 and a motor, the hybrid vehicle using at least the motor for driving the vehicle, wherein: when the controller determines that it is necessary to supply the hydrogen gas to the internal combustion engine, the motor forces the engine to rotate while combustion is stopped in the engine, and the hydrogen-producing device and the hydrogen mixing device are operated so that the hydrogen-blended fuel is injected from the fuel injection device. 21. A hydrogen-using internal combustion engine as defined in claim 1, wherein: the fuel supplying device comprises a fuel tank in which the liquid fuel is stored, the hydrogen producing device that produces hydrogen gas from a liquid hydride by using electric energy, and the hydrogen mixing device that mixes the hydrogen gas produced by the hydrogen producing device into the liquid fuel supplied from the fuel tank to the fuel injection device;a circulating device is provided for circulating the liquid fuel through the fuel tank and the hydrogen mixing device;a regenerating system is provided for recovering deceleration energy of a vehicle to provide electric energy; anda controller is provided for activating the hydrogen-producing device to produce hydrogen gas by utilizing the deceleration energy recovered by the regenerating system and activating the hydrogen mixing device to mix the produced hydrogen gas into the liquid fuel while causing the circulating device to circulate the liquid fuel, when the deceleration energy is being recovered by the regenerating system and fuel injection by the fuel injection device is being stopped. 22. A hydrogen-using internal combustion engine as defined in claim 21, wherein the hydrogen mixing device produces minute bubbles of the hydrogen gas and mixes the minute bubbles of the hydrogen gas into the liquid fuel. 23. A hydrogen-using internal combustion engine as defined in claim 21, further comprising an ignition device that ignites an air-fuel mixture in a combustion chamber, wherein: the controller inhibits the ignition device from igniting the air-fuel mixture and causes the fuel injection device to inject the hydrogen blended fuel when a condition for a reducing process for a catalyst provided in an exhaust passage of the engine is satisfied while the regenerating system is recovering the deceleration energy and the fuel injection device is otherwise stopped from injecting fuel. 24. A hydrogen-using internal combustion engine as defined in claim 21, wherein: the fuel injection device is arranged to inject the liquid fuel directly into a combustion chamber; andthe controller causes the fuel injection device to inject the liquid fuel in such timing that the injected fuel does not burn in the combustion chamber when a condition for a reducing process for a catalyst provided in an exhaust passage of the engine is satisfied while the regenerating system is recovering the deceleration energy and the fuel injection device is otherwise stopped from injecting fuel. 25. A hydrogen-using internal combustion engine as defined in claim 1, wherein: the fuel supplying device comprises a fuel tank in which the liquid fuel is stored, a hydrogen producing device that produces hydrogen gas from a liquid hydride, and a hydrogen mixing device that mixes the hydrogen gas produced by the hydrogen producing device into the liquid fuel supplied from the fuel tank to the fuel injection device;a circulating device is provided for circulating the liquid fuel through the fuel tank and the hydrogen mixing; device, and for activating the hydrogen-producing device to produce hydrogen gas and activating the hydrogen mixing device to mix the produced hydrogen gas into the liquid fuel while causing the circulating device to circulate the liquid fuel, prior to start of fuel injection by the fuel injection device, when the internal combustion engine is started or starting of the engine is predicted. 26. A hydrogen-using internal combustion engine as defined in claim 25, wherein the hydrogen mixing device produces minute bubbles of the hydrogen gas, and mixes the minute bubbles of the hydrogen gas into the liquid fuel.