Patent ID: 6019075
Filing Date: 2000-02-01
Classification: F02B,F02M,Y02T

Abstract:
A fuel and air delivery system for a fuel injected, two stroke internal combustion engine having a crankcase chamber, a combustion chamber and a transfer passage communicating the crankcase chamber with the combustion chamber during a portion of the engine's stroke comprising:a compressor driven by the engine to pressurize a rich fuel and air mixture therein and deliver the rich mixture under pressure to the combustion chamber of the engine to which air is delivered from the crankcase chamber to support combustion of the fuel;a fuel and air metering device having a fluid passage with an inlet through which air flows into the fuel and air metering device and an outlet communicating with the compressor, a fuel supply reservoir, a fuel inlet through which fuel is drawn into the fuel supply reservoir, and a fuel nozzle in communication with the fuel reservoir and with the fluid passage downstream of the inlet to draw fuel from the fuel supply reservoir and deliver it into the fluid passage in response to air flowing through the fluid passage and to mix the fuel with the air flowing through the fluid passage to deliver the rich fuel and air mixture to the compressor;an engine air throttle body having a housing, an air passage through the housing with an inlet through which air flows into the housing and an outlet through which air flows into the engine crankcase chamber, a throttle valve disposed within the passage and moveable from a fully open position permitting a substantially unrestricted flow of air through the passage to a fully closed position at least substantially restricting the flow of air through the passage and into the engine crankcase and at least one air outlet port downstream of the throttle valve when in its closed position and communicating with the fuel nozzle of the fuel and air metering device whereby each outlet port provides a positive pressure air signal to the fuel and air metering device which varies in response to the position of the throttle valve to vary the fuel discharged from the fuel nozzle to correspond to the engine fuel demand.