| 摘要 |
The invention discloses a method of operating an internal combustion engine, of the Merritt type. The Merritt type engine has a combustion chamber (5, figure 1) separate from the cylinder, in which the chamber receives gas during the compression stroke through a transfer orifice. The transfer orifice provides tangential velocity component to the gas, there is also a means to impart axial velocity component to the gas, which produce a swirling air flow within the chamber. The combustion chamber includes an injection and ignition means. The method comprises delivery of fuel from the injector into a bump clearance volume above the piston, after ignition and/or after the piston commences its expansion stroke, such as a post injection while the piston is at or after top dead centre. The method may also throttle the air inlet means by partially restricting the air inlet means. The injector may be controlled to have multiple injection profiles. The methods allow exhaust emission to be controlled, by reducing the amount of nitrogen oxides (NOx) in the exhaust, and increase the temperature of the exhaust to assist a catalytic convert. It also allows for control over peak pressures and increased power density within the engine. |
