CHOKE


Meaning of CHOKE in English

in gasoline engine, valve, usually of the butterfly type, in the air-intake passage to the carburetor. It controls the volume of air drawn in to mix with the gasoline to form the fuel-air mixture. When the engine is cold, the choke is closed, so that the mixture is rich in gasoline; as the engine warms up, the choke is opened to make the mixture leaner, i.e., to reduce its richness. The choke may be controlled either manually or automatically. In the automatic choke shown in the illustration, the choke plate is mounted on a short shaft (S) that is pivotally mounted in the intake passage. The inside end of the spiral bimetallic spring, which is located in a separate housing, is attached to the shaft and controls its rotation. When cold, the spring holds the choke in the closed position. When the engine is cranked, the suction against the choke plate plus the intake-manifold vacuum acting on the vacuum piston tend to open the choke (i.e., rotate the choke plate clockwise). As the engine warms up, air heated by the exhaust manifold enters the spring housing through the small tube and raises the temperature of the spring, causing it to rotate the choke into the wide-open position.

Britannica English vocabulary.      Английский словарь Британика.