Читать книгу Internal Combustion Engines - Allan T. Kirkpatrick - Страница 14

The two major cycles currently used in internal combustion engines are termed spark‐ignition and compression‐ignition cycles, also known as Otto and Diesel cycles, named after the two men credited with their invention. As we will see in Chapter 2, the Otto cycle is modeled as a constant volume combustion cycle and the Diesel cycle is modeled as a constant pressure combustion cycle. These cycles can configured as either a two‐stroke cycle in which the piston produces power on every downward stroke or a four‐stroke cycle in which the piston produces power every other downward stroke.