Intake device for internal-combustion engine

Abstract

Abstract PURPOSE:To suppress the production of smoke and the deterioration of fuel efficiency, by driving a swirl causing means depending on the increase in the recycled quantity of exhaust gas to intensity an intake swirl. CONSTITUTION:When the exhaust gas of an engine is recycled, the negative pressure acting to the pressure chamber 16 of a diaphragm unit 15 through a negative pressure control valve 18 is regulated by a control unit 19 depending on the load on the engine and its rotational frequency. An exhaust gas recycling valve 14 is driven to a degree of opening which corresponds to the negative pressure. When the degree of opening of the valve 14 is heightened, namely, the recycled quantity of the exhaust gas is increased, an air flow control plate 21A as a swirl causing means is turned to decrease its inclination angle theta' to reduce the cross-sectional area of an intake passage 3. As a result, the velocity of the flow of an intake entering into a vortical passage 6 is augmented to intensify an intake swirl in a combustion chamber.

Inventors

• 👤 Shogo Saegusa
• 👤 三枝　省五

Bibliographic Details