Device for controlling or monitoring the start of introduction under pressure, of a fuel-air mixture following scavenging of an engine cylinder by air

Claim 1

Device for controlling the start of introduction, under pressure, of a fuel-air mixture into a first cylinder of an internal combustion engine, said engine comprising at least one other cylinder having a pump crankcase, a passageway to provide a connection between said pump crankcase and the upper part of the first cylinder, means for injecting fuel into said passageway and means for blocking communication between said passageway and the combustion chamber of the first cylinder, with a non-zero angular offset existing between the cycles of said pistons, characterized by comprising control means for controlling a start of injection, said control means interrupting in an intermittent and predetermined fashion, communication between said passageway and said pump crankcase, wherein said control means comprises an opening provided in a lower part of said other cylinder, said opening being blocked by a skirt of the piston of said other cylinder.