Mixture control system for an internal combustion engine with controlled injection fuel

Claim 2

A mixture control system for an internal combustion engine of the fuel injection type for supplying both fuel and air during a coasting operation wherein air and fuel are delivered separately to the intake part of each engine cylinder and wherein the fuel injection is regulated in dependence on the air intake pipe pressure, characterized in the provision of an air supply channel, a valve controlling the flow of air through said channel and operated in dependence on operational values of the engine, which values in the coasting operation assume characteristic values, said valve closing the air supply channel during idling but opening it during coasting so as to enable additional air to be supplied.

Claim 3

A mixture control system according to claim 1 characterized in that the valve is operated in dependence on the intake pipe pressure and has been designed in such a way that the air supply channel is opened only when the intake pipe pressure drops below the pressure which prevails in the intake pipe during idling.

Claim 4

A mixture control system according to claim 2, characterized in that a throttle valve is operatively disposed in said intake pipe and the air supply channel acts as a by-pass and communicates with the intake pipe at a location downstream of the throttle valve.

Claim 5

A mixture control system according to clalim 2, characterized in that the valve is a diaphragm valve.

Claim 6

A mixture control system according to clalim 2, characterized in that the valve is a diaphragm valve.

Claim 7

A mixture control system according to claim 4, characterized in that the diaphragm valve contains an arrangement for taking the atmosphereic pressure into consideration.

Claim 8

A mixture control system according to claim 1 wherein said valve is a spring loaded ball valve.

Claim 9

A mixture control system according to claim 1 wherein the air supply channel is an intake pipe, said valve is a throttle valve disposed in controlling the flow of air through said pipe, said valve being a spring loaded choke poppet valve mounted on and controlling an opening through said valve.

Claim 10

A mixture control system for an internal combustion engine wherein the fuel injection is regulated in dependence on its intake pipe pressure (or its performance graph), characterized in the provision of an air supply channel, a valve controlling the flow of air through said channel and operated in dependence on operational values of the engine, which values in coasting operation assume characteristic values, said valve closing the air supply channel during idling but opening during coasting, said valve being a diagphragm valve which is operated in dependence on the intake pipe pressure and has been designed in such a way that the air supply channel is opened only when the intake pipe pressure drops below the pressure which prevails in the intake pipe during idling, said diaphragm valve contaiNing an arrangement for taking the atmospheric pressure into consideration, and being characterized by the fact that the diaphragm of the valve consistutes a yieldable partition between a first chamber containing air under atmospheric pressure and a second chamber communicating with the intake pipe, there being an additional valve controlling communication between said second chamber and the intake pipe in dependence on the difference between the intake pipe pressure and the atmospheric pressure.

Claim 11

A mixture control system for an internal combustion engine wherein the fuel injection is regulated in dependence on its intake pipe pressure (or its performance graph), characterized in the provision of an air supply channel, a valve controlling the flow of air through said channel and operated in dependence on operational values of the engine, which values in coasting operation assume characteristic values, said valve closing the air supply channel during idling but opening during coasting, said valve being a diagphragm valve which is operated in dependence on the intake pipe pressure and has been designed in such a way that the air supply channel is opened only when the intake pipe pressure drops below the pressure which prevails in the intake pipe during idling, said diaphragm valve contaiNing an arrangement for taking the atmospheric pressure into consideration, and being characterized by the fact that the diaphragm of the valve consistutes a yieldable partition between a first chamber containing air under atmospheric pressure and a second chamber communicating with the intake pipe, there being an additional valve controlling communication between said second chamber and the intake pipe in dependence on the difference between the intake pipe pressure and the atmospheric pressure.

Claim 12

A mixture control system for a fuel injection type internal combustion engine to which during a coasting operation, while maintaining a supply of fuel, atmospheric air is admitted through an intake pipe under the control of a throttle valve interposed in said intake pipe, wherein the improvement comprises: means defining a supplemental air channel by-passing said throttle valve for delivering atmospheric air into said intake pipe at a location downstream of said throttle valve; a second valve controlling the flow of air through said channel; means resiliently urging said second valve to a closed position; and means responsive to pressure in said intake pipe at a location downstream of said throttle valve for opening said second valve only when the pressure at said location drops below the pressure which prevails at said location during idling of the engine so as to enable additional air to be supplied during such coasting operation.

Claim 13

A mixture control system for a fuel injection type internal combustion engine to which during a coasting operation, while maintaining a supply of fuel, atmospheric air is admitted through an intake pipe under the control of a throttle valve interposed in said intake pipe, wherein the improvement comprises: means defining a supplemental air channel by-passing said throttle valve for delivering atmospheric air into said intake pipe at a location downstream of said throttle valve; a second valve controlling the flow of air through said channel; means resiliently urging said second valve to a closed position; and means responsive to pressure in said intake pipe at a location downstream of said throttle valve for opening said second valve only when the pressure at said location drops below the pressure which prevails at said location during idling of the engine so as to enable additional air to be supplied during such coasting operation.