the gas flows at a high velocity from the high-pressure chamber 215 into the low-pressure chamber 216. The velocity of the gas is not lower than a sound velocity; that is the gas flows at a velocity higher than Mach number one. Shock waves are classified into compression waves which increase the pressure, temperature and density of a gas as they propagate, and expansion waves which reduce the pressure, temperature and density of a gas as they propagate. A compression wave propagates from the high-pressure chamber 215 toward the low-pressure chamber 216. Pressure, temperature and density change discontinuously at the wavefront of a shock wave; the same increases at the wavefront of a compression wave.
If such a shock wave is generated in the combustion chamber of the engine, the shock wave is reflected repeatedly by the wall defining the combustion chamber. It is the point of the present invention to atomize the fuel by vibrating a spray of the fuel injected into the combustion chamber by the pressure energy of the shock wave.
The foregoing effect is available if the start of fuel injection is timed so as to be synchronized with the opening timing of the suction valve to inject the fuel into the combustion chamber immediately after the generation of a shock wave or while a shock wave is being generated as shown in FIG. 3. Thus, the fuel can be effectively atomized simply by controlling fuel injection start timing and intake valve opening timing, and any special modification of the fuel injector and the like for the atomization of the fuel is not necessary.
The generation of a shock wave must be predicted or detected and fuel injection must be controlled to realize the foregoing effect on an actual engine. One of methods of realizing the foregoing effect on an actual engine uses a
the gas flows at a high velocity from the high-pressure chamber 215 into the low-pressure chamber 216. The velocity of the gas is not lower than a sound velocity; that is the gas flows at a velocity higher than Mach number one. Shock waves are classified into compression waves which increase the pressure, temperature and density of a gas as they propagate, and expansion waves which reduce the pressure, temperature and density of a gas as they propagate. A compression wave propagates from the high-pressure chamber 215 toward the low-pressure chamber 216. Pressure, temperature and density change discontinuously at the wavefront of a shock wave; the same increases at the wavefront of a compression wave.If such a shock wave is generated in the combustion chamber of the engine, the shock wave is reflected repeatedly by the wall defining the combustion chamber. It is the point of the present invention to atomize the fuel by vibrating a spray of the fuel injected into the combustion chamber by the pressure energy of the shock wave.The foregoing effect is available if the start of fuel injection is timed so as to be synchronized with the opening timing of the suction valve to inject the fuel into the combustion chamber immediately after the generation of a shock wave or while a shock wave is being generated as shown in FIG. 3. Thus, the fuel can be effectively atomized simply by controlling fuel injection start timing and intake valve opening timing, and any special modification of the fuel injector and the like for the atomization of the fuel is not necessary.ต้องคาดการณ์ หรือตรวจพบรุ่นของคลื่นกระแทก และฉีดเชื้อเพลิงต้องถูกควบคุมการตระหนักถึงผลกระทบต่อเครื่องยนต์จริงข้างต้น หนึ่งวิธีของการตระหนักถึงผลกระทบต่อเครื่องยนต์จริงข้างต้นใช้เป็น
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