Abstract: A reductant supply system includes a reductant tank, an injector supply conduit fluidly connecting the reductant tank with an injector, a driving fluid source in fluid communication with the reductant tank via a dose driving conduit, a purge conduit in fluid communication with the driving fluid source and the reductant tank, and a valve in fluid communication with the reductant tank via the dose driving conduit and the purge conduit.

Abstract: A reductant supply system includes a reductant tank, an injector supply conduit fluidly connecting the reductant tank with an injector, a driving fluid source in fluid communication with the reductant tank via a dose driving conduit, a purge conduit in fluid communication with the driving fluid source and the reductant tank, and a valve in fluid communication with the reductant tank via the dose driving conduit and the purge conduit.

Abstract: A fluid system for an internal combustion engine is provided that is used to supply the operating muscle to engine subsystems. These subsystems include a fuel injection system, an exhaust valve actuation system and an intake valve actuation system. The fluid system is isolated from any other engine fluid system so as to control temperature, cleanliness levels and absorption of combustion byproducts.

Abstract: Method for operating a free-piston engine to produce relatively low amounts of undesirable NOx by initiating injection of the atomized fuel mixture into the combustion chamber after closure of exhaust apertures by the combustion chamber piston during the compression stroke thereof to attain a homogeneous fuel-air mixture and relatively lower and more uniform local combustion flame temperature in the combustion chamber.

Abstract: A bypass system for a diesel engine having a turbocharger, a bypass conduit, a valve and a controller which cooperate to bypass a portion of the combustion air compressed by the turbocharger bypassed to a turbine portion of the turbocharger or to the atmosphere, a controller containing maps based on empirical fixed point data specific to the engine, turbocharger and bypass system responds to signals indicative of changes in atmospheric pressure, inlet manifold pressure and engine speed to control the valve and prevent the turbocharger from surging.