A container stores a small quantity of air and pumps the air into the idling system of a carburetor when the engine ignition system is turned off. The air reduces the supply of idling fuel to the engine for a time period sufficient to stop engine dieseling. An electrical solenoid valve connected to the engine ignition system controls the injection of the air into the idling passage.
An automatic device and method to prevent dieseling from occurring within an internal combustion engine after ignition shutoff by introducing a sudden stream of air onto the idle fuel chamber of the engine's carburetor, thereby producing a "lean" fuel mixture, making it unable to burn within the engine.
The carburetor air/fuel idle system mixture channel has an air port that is normally closed by a manifold vacuum sensitive valve; during either engine deceleration or shutdown operations, the air valve is opened to bleed the vacuum signal on the idle system fuel jet, to terminate idle system fuel, air flowing through the idle system air/fuel mixture channel to the engine cylinders.
Auxiliary apparatus for hot-starting an internal combustion engine includes a secondary air injection nozzle opened in the intake manifold, and a heat sensitive solenoid valve to control the supply of secondary air from an air source to the nozzle. When hot-starting the engine with the engine temperature exceeding a predetermined level, the valve opens to supply a jet of air into the intake manifold through the nozzle so that a too rich mixture gas likely to be produced in the manifold is made leaner, thus reducing the output of unburned, harmful ingredients of exhaust gas from the engine as well as improving the startability of a hot engine.
An exhaust gas purifying system for use in an automobile internal combustion engine which comprises a primary air supply device, a secondary air supply device and a switching device for switching the operation of either or both of said primary and secondary air supply devices in response to the operating conditions of the internal combustion engine, whereby the substantial elimination of abnormal combustion occurring in the exhaust system and the emission of the noxious unburned compounds present in the exhaust gas can be advantageously ensured.
The carburetor idle system air/fuel channel has an additional air bleed that is opened and closed by an electrically controlled valve that is initially opened upon engine shutdown to bleed the idle channel fuel signal, to terminate fuel flow, and subsequently closed in response to engine vacuum decay, to recondition the idle channel for normal operation.
