A dual-fuel method for boost fuel substitution in turbo-charged diesel engines

摘要

An assembly for boost fuel substitution in turbo charged diesel engines; the assembly including: a diesel engine including an inlet manifold (2) and an exhaust manifold; a turbocharger (3) in communication with said inlet manifold (2); first and second reservoirs of diesel (10) and gas (13) respectively selectively in communication with said engine; a fuel injection pump (8) including an aneroid (9) intermediate the first reservoir of diesel (10) and said inlet manifold (2); a control valve (11) intermediate the second reservoir of gas (13) and said inlet manifold (2); characterised in that the assembly includes at least two solenoids (6, 7) each capable of moving between first and second operational states; wherein a first of said solenoids (6) is located between the inlet manifold (2) and said fuel injection pump (8) and the second solenoid (7) is located between said inlet manifold (2) and said control valve (11) wherein, said first solenoid (6) responsive to a predetermined engine operating parameter moves between a first state in which pressurised air from said inlet manifold (2) communicates with said aneroid (9) and atmospheric air is isolated from the aneroid (9) and a second state in which manifold air to the fuel injection pump (8) is interrupted and atmospheric air is in communication with the aneroid (9) and pressurised air from said inlet manifold (2) terminates at said first solenoid (6); and wherein the second solenoid (7) responsive to said predetermined engine operating parameter and/or signal is located between said inlet manifold (2) and said control valve (11) and moves between a first state in which atmospheric air is in communication with said control valve (11) and second state in which pressurised air from said inlet manifold (2) is in communication with said control valve (11); wherein when the first solenoid (6) isolates said first fuel type, the second solenoid (7) operates responsive to a signal to allow boost fuel provided by said second fuel type to communicate between the second fuel source (13) and the engine.