METHANOL FUELED DIESEL CYCLE INTERNAL COMBUSTION ENGINE

摘要

The combination of an intake air supply system with an internal combustion engine (10) having a charge air cooler, a cylinder charging air intake and an exhaust discharge is provided. The intake air supply system includes a Roots-type positive displacement blower (37) having inlet (38) and outlet (40) means and an exhaust gas driven turbo-compressor (41) connected in series with the blower (37). The intake air supply system further includes a bypass passage (58) connecting the blower inlet (38) and outlet (40) and a valve (54) in the bypass passage (58) to control the flow of fluid through the bypass (58). The valve (54) inoperative to open and close the bypass passage (58) in response to engine operating parameters and to modulate the flow area of the passage; (58) in response to the same engine operating parameters so as to infinitely vary the flow area between the open and closed positions of the valve (54). The valve (54) is modulated to operatively maintain the bypass passage (58) at least partially open at engine idle, whereby the valve means (54) permits bypass flow to recirculate air flow from the blower outlet (40) to the inlet (38) to reduce ar limit the engine power absorbed by the blower (37) or to conduct additional air flow around the blower (37) directly from the turbo-compressor (41) to the engine intake to avoid the restriction of the blower (37) to increased charging air flow. A single valve means thus provides a dual function capability.