Fuel supply system with high turn down ratio

Details Fuel supply system with high turn down ratio Fuel supply system with high turn down ratio

F - Mech Eng,Light,Heat,Weapons

02

D

F02D 1/00 (2006.01) F02M 45/04 (2006.01) F02M 45/08 (2006.01) F02B 3/06 (2006.01)

Patent

CA 2103338

A fuel injection system for an internal combustion engine, such as a dual fuel diesel/gas engine of the type requiring an overall system turn-down ratio capability, from maximum fuel flow rate to minimum flow rate, on the order of 100 to 1, employs a conventional variable displacement primary pump having a turn-down ratio substantially less than the overall system ratio. The output of the primary pump branches to supply two parallel fuel conduit paths. Each path includes a pressure actuated shut-off valve means. The primary shut off valve means path opens to permit flow through the path to the engine at pressures in excess of a relatively high value. The secondary valve means opens to permit flow through the secondary path in response to a relatively lower pressure at the pump outlet. And, a fixed quantity fluid dispenser in the secondary flow path operates in response to opening of the secondary valve means, to displace a fixed quantity of fuel through the secondary path and into the engine. In general, the secondary path prevents the build-up of sufficient fuel pressure at the output of the primary pump to open the primary valve means when the variable output rate of the primary pump is set at the lowest part of its range. When the output of the primary pump is set sufficiently high, pressure builds in the outlet line of the primary pump because the delivery rate of the primary pump exceeds the rate at which fluid can be disposed of in the secondary path; the additional fuel displaced by the main pump is delivered to the engine accordingly, through the primary path.

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