Stratified-mixture supplied engine

Abstract

Abstract PURPOSE:To enable to keep exhaust-gas purifying function, by selecting either of stratified combustion or homogeneous combustion according to the engine load, and decreasing the quantity of intake air by reducing the sectional area of an intake passage in case that the temperature of exhaust gas is low at the time of stratified combustion when the engine load is low and lean mixture is supplied. CONSTITUTION:At the time of low-load operation of an engine that is detected by a detecting means 17, a control unit 16 consisting of a microcomputor or the like controls the quantity of intake air to keep it constant by fully opening a throttle valve 14 and functions to cause stratified lean combustion by supplying stratifying fuel toward an igniting means 8 from an injection nozzle 9. In this state, if the temperature of exhaust gas detected by a dector 18 is lower than a prescribed value, a throttle valve 14 is closed by operating a means 21 to decrease the quantity of intake air. On the other hand, at the time of high-load operation of the engine when the engine load becomes higher than a prescribed value, combustion mode is switched to homogeneous combustion by reducing the supply rate of stratifying fuel and starting supply of scattering fuel from an injection nozzle 12 to compensate the decreased quantity of fuel. With such an arrangement, it is enabled to activate a catalyst by raising its temperature promptly when reaction of the catalyst is started and to thereby keep its excellent exhaust-gas purifying function.

Inventors

• 👤 Takashige Tokushima
• 👤 徳島　孝成
• 👤 Hiroyuki Oda
• 👤 博之 小田
• 👤 Takeshi Matsuoka
• 👤 松岡　孟
• 👤 Haruo Okimoto
• 👤 沖本　晴男
• 👤 Masakimi Kono
• 👤 河野　誠公

Bibliographic Details