| 摘要 |
PROBLEM TO BE SOLVED: To facilitate switching operation of fuel with a simple constitution in a bi-fuel engine.SOLUTION: A bi-fuel engine includes: a pressure supply passage 35 extended from a crank chamber 4 and branched to a first branch passage 35B and a second branch passage 35C through a branch part; a gas fuel opening and closing valve 28 provided on a gas fuel supply passage 26, connected to the first branch passage, and capable of opening and closing the gas fuel supply passage when a pressure is supplied through the first branch passage, and maintaining the gas fuel supply passage in a close state when supply of the pressure through the first branch passage is shut off; a liquid fuel pump 33 provided on a liquid fuel supply passage 30 and pressure-feeding the liquid fuel to an intake system side by pulsation of the pressure supplied through the second branch passage; and a switch valve 37 provided in the branch part of the pressure supply passage and switching the passage communicated with the crank chamber between the first branch passage and the second branch passage. |
