Patent ID: 7568452

Claim:
An engine system which mounts a medium chemically repeating a hydrogen absorption and a hydrogen desorption thereon, is provided with a hydrogen supplying apparatus generating or storing a hydrogen rich gas from said medium, and drives an engine by using said hydrogen rich gas as one of fuels, wherein an exhaust pipe of the engine is provided with said hydrogen supplying apparatus and a purifying catalyst for purifying an exhaust gas of the engine, and said purifying catalyst is installed closer to the engine than said hydrogen supplying apparatus, or said hydrogen supplying apparatus and said purifying catalyst are integrally formed, and wherein the engine system comprises: a storage amount detecting means detecting a storage amount of said hydrogen rich gas stored in the storage apparatus; a hydrogen rich gas storage amount detecting means judging whether or not the storage amount of said hydrogen rich gas detected by said storage amount detecting means is in a range of a predetermined value, at a time of receiving an engine stop signal; and a medium supply means supplying said medium to said hydrogen supplying apparatus in the case that the storage amount of said hydrogen rich gas is judged to be equal to or less than a predetermined value by said hydrogen rich gas storage amount judging means.