Abstract:
A four cylinder spark ignition internal combustion engine has an exhaust emission control system including means for admitting fresh air into the exhaust system in order to promote a further combustion of partly burnt components in the gases coming from the combustion chambers, this means include a "reed" valve connected to the exhaust ports leading from the first and fourth cylinders (numbering from one end of the engine) through internal passages within the cylinder head; the system also comprises an exhaust gas recirculating system comprising a pneumatic valve which opens, when the conditions are appropriate, to draw off a proportion of the exhaust gases from the exhaust side of the engine and admit them to the induction side of the engine taking exhaust gases from branches of the exhaust manifold carrying exhaust gases from the second and third cylinders; in addition there is a system for admitting supplementary air to the induction manifold downstream of the carburettor during engine overrun conditions except when the engine is cold, and the carburettor is provided with supplementary pumps and valves which only function when the engine is cold, being inhibited as the engine approaches its normal working temperature.
Abstract:
A carburetor comprises, in addition to an ordinary carburetor arrangement, a suction system for starting use including a starter throttle valve and fuel metering means which are both controllable for opening and closing and for metering function by a temperature-sensing control member or members. It further includes diaphragm means for placing a restriction on the starter throttle valve at the start of the engine to set the valve to a desired opening and for removing the restriction at the time of self-cranking of the engine.
Abstract:
In providing a separate supply of fuel to an internal combustion engine when it is started up from a cold condition or as it idles following a cold start up, an additional supply of fuel is withdrawn from the engine carburetor float chamber and is passed through a valve operated fuel well into a fuel chamber. The fuel well is opened when the intake manifold of the engine is at atmospheric pressure for passing fuel into the fuel chamber. A fuel line connects the fuel chamber to the venturi tube for supplying fuel to the engine and a branch pipe, communicating with the fuel line, adds air to the fuel as it is directed into the venturi tube. The passage of fuel through the fuel line is discontinued in response to a temperature sensing arrangement which checks the engine temperature and, when a predetermined temperature level is reached, cuts off the flow through the fuel line to the venturi tube.
Abstract:
A fuel processing unit replacing the usual carburetor provides passage means maintained at sub-atmospheric pressure through which an airstream flows from an air-intake port of the unit to intake manifold of the engine. A heating coil wound helically to a cylindrical configuration is embraced by a cylindrical fine mesh wire screen which is heated by the heating coil and is continuously sprayed from the outside with volatile liquid fuel. The airstream that flows through the passage means flows radially inwardly through the cylindrical screen and through the closely spaced turns of the helical heating coil to produce a completely dry gaseous stream of air and fuel vapor which is then subjected to turbulence to result in a uniform mixture. When the engine is started while cold a thermostatic valve feeds liquid fuel into the air-vapor stream, and when a throttle valve is opened to accelerate the engine, additional air is fed into the turbulent zone of the fuel mixture stream.
Abstract:
An automatic cold starting device for an internal combustion engine comprises, in an auxiliary passage leading into the main induction passage through which fuel/air mixture is normally supplied to the engine downstream of the main throttle valve, a second throttle valve and a fuel supply source controlled by a fuel valve, the second throttle valve and fuel valve being fully open when the engine is cold, being initially partly closed by suction in the auxiliary passage when the engine starts, and being then controlled for progressive further closing by a temperature sensitive device responsive to engine temperature.