Method for minimizing choking losses in the gas change in an internal combustion engine

摘要

A method for reducing the amount of flue gas remaining in the cylinder (14) of an internal combustion engine is within the technology of an internal combustion engine. It can be used to adjust (reduce) the amount and pressure of the fuel gases remaining in the Z-cylinder (14) when the exhaust valves and bypass valves (10, 11) close. An additional bypass valve (11) bypassing the turbine (1) of the turbocharger (1) passes through the bypass channel (16) a portion of the combustion gases past the turbine to its low pressure outlet (17). Said bypass valve (11) begins to open as the piston (14) begins to move upward from its lower dead center, and closes at the same time as the actual exhaust valve (10), earlier than 60 degrees before the upper dead center of the piston (18). In this case, by lowering the pressure of the fuel gases remaining in the cylinder (14) (by adjusting the adjustable throttle valve (12)), the Z engine (Figures 1 and 2) can ensure successful fuel injection (Figure 1, item 3, fuel injection into hot internal exhaust) bar pressurized fuel gas in the engine cylinder with a thin, conical, short penetration fuel jet (15). The lower fuel gas pressure and amount in the cylinder when the exhaust valves and bypass valves (10, 11) are closed also results in a lower gas mixture temperature at the top of the piston, after the piston has 11) after closure, the fuel is injected with fuel (Figure 1, item 3, injection of fuel into hot internal exhaust) and when high pressure supply air is supplied to the cylinder (Figure 1, item 4, supply air inlet). Thus, spontaneous ignition of the mixture can be avoided and ignited by, for example, a spark plug, or by ignition injection (Figure 1, item 1, injection of fuel, combustion, and stroke).