Low throttled volume engine

Claim 2

In an internal combustion engine, a combustion chamber having an intake port, an intake valve operable to open and close said intake port, and a single-throttle air-fuel delivery system for delivering a throttled air-fuel mixture to said intake port comprising an intake passage having an inlet end open to an air supply and an outlet end connected to said intake port, dividing means separating said intake passage into separate small and large flow area passages forming a throttled portion extending from said intake port having a short length as compared to the remaining unthrottled length of said intake passage, fuel supply means for supplying fuel to said intake passage a location upstream of its division, and a single throttle valve in said intake passage adjacent said intake port and upstream of said dividng means for throttling both said small and large flow area passages so that at small throttle valve openings at least substantially all the air-fuel mixture is caused to flow through said small flow area passage to said intake port at a substantially increased velocity relative to that upstream of said throttle valve and without substantial dissipation and at large throttle valve openings the air-fuel mixture is caused to flow through both of said small and large flow area passages to said intake port whereby air-fuel mixture is delivered to said intake port throughout the range of throttle valve openings by the cooperation between said throttle valve and said small and large flow area passages while the pressure upstream of said throttle valve and adjacent said intake port is maintained substantially atmospheric by virtue of said short throttled portion to minimize engine pumping loss.

Claim 3

In an internal combustion engine, a combustion chamber having an intake port, an intake valve operable to open and close said intake port, and a single-throttle air-fuel delivery system for delivering a throttled air-fuel mixture to said intake port comprising an intake passage having an inlet end open to an air supply and an outlet end connected to said intake port, a tube dividing said intake passage into separate small and large flow area passages forming a throttled portion extending from said intake port having a short length as compared to the remaining unthrottled length of said intake passage, said small flow area passage being through said tube and having an outlet directed toward where said intake valve opens, fuel supply means for supplying fuel to said intake passage at a location upstream of its division, and a single throttle valve pivotally mounted in said intake passage adjacent said intake port and upstream of said tube for cooperating with said intake passage and said tube to throttle both said small and large flow area passages so that at small throttle valve openings substantially all the air-fuel mixture is caused to flow through said small flow area passage to said intake port at a substantially increased velocity relative to that upstream of said throttle valve and without substantial dissipation and at large throttle valve openings the air-fuel mixture is caused to flow through both of said large flow area passages to said intake port whereby air-fuel mixture is delivered to said intake port throughout the range of throttle valve openings by the cooperation between said throttle valve and said small and large flow area passages while the pressure upstream of said throttle valve and adjacent said intake port is maintained substantially atmospheric by virtue of said short throttled portion to minimize engine pumping loss.

Claim 4

In an internal combustion engine, a combustion chamber having an intake port, an intake valve operable to open and close said intake port, and a single-throttle air-fuel delivery system for delivering a throttled air-fuel mixture to said intake port comprising an intake passage having an inlet end open to an air supply and an outlet end connected to said intake port, a tube dividing said intake passage into separate small and large flow area passages forming a throttled portion extending from said intake port having a short length as compared to the remaining unthrottled length of said intake passage, said small flow area passage being through said tube and having an outlet directed toward where said intake valve opens, fuel supply means for supplying fuel to said intake passage at a location upstream of its division, and a single throttle valve pivotally mounted in said intake passage adjacent said intake port and upstream of said tube for cooperating with said intake passage and said tube to throttle both said small and large flow area passages so that at small throttle valve openings substantially all the air-fuel mixture is caused to flow through said small flow area passage to said intake port at a substantially increased velocity relative to that upstream of said throttle valve and without substantial dissipation and at large throttle valve openings the air-fuel mixture is caused to flow through both of said large flow area passages to said intake port whereby air-fuel mixture is delivered to said intake port throughout the range of throttle valve openings by the cooperation between said throttle valve and said small and large flow area passages while the pressure upstream of said throttle valve and adjacent said intake port is maintained substantially atmospheric by virtue of said short throttled portion to minimize engine pumping loss.

Claim 5

In an internal combustion engine, a combustion chamber having an intake port, an intake valve operable to open and close said intake port, and a single-throttle air-fuel delivery system for delivering a throttled air-fuel mixture to said intake port comprising an intake passage having an inlet end open to an air supply and an outlet end connected to said intake port, a tube dividing said intake passage into separate small and large flow area passages forming a throttled portion extending from said intake port having a short length as compared to the remaining unthrottled length of said intake passage, said small flow area passage being through said tube and having an outlet directed toward where fuel supply means for supplying fuel to said intake passage at a location upstream of its division, and a single throttle valve slidably mounted in said intake passage adjacent said intake port and upstream of said tube for cooperating with said intake passage and said tube to throttle both said small and large flow area passages so that at small throttle valve openings all the air-fuel mixture is caused to flow through said small flow area passage to said intake port at a substantially increased velocity relative to that upstream of said throttle valve and without substantial dissipation and at large throttle valve openings the air-fuel mixture is caused to flow through both of said small end large flow area passages to said intake port whereby air-fuel mixture is delivered to said intake port throughout the range of throttle valve openings by the cooperation between said throttle valve and said small and large flow area passages while the pressure upstream of said throttle valve and adjacent said intake port is maintained substantially atmosphereic by virtue of said short throttled portion to minimize engine pumping loss.

Claim 6

In an internal combustion engine, a combustion chamber having an intake port, an intake valve operable to open and close said intake port, and a single-throttle air-fuel delivery system for delivering a throttled air-fuel mixture to said intake port comprising an intake passage having an inlet end open to an air supply and an outlet end connected to said intake port, a tube dividing said intake passage into separate small and large flow area passages forming a throttled portion extending from said intake port having a short length as compared to the remaining unthrottled length of said intake passage, said small flow area passage being through said tube and having an outlet directed toward where fuel supply means for supplying fuel to said intake passage at a location upstream of its division, and a single throttle valve slidably mounted in said intake passage adjacent said intake port and upstream of said tube for cooperating with said intake passage and said tube to throttle both said small and large flow area passages so that at small throttle valve openings all the air-fuel mixture is caused to flow through said small flow area passage to said intake port at a substantially increased velocity relative to that upstream of said throttle valve and without substantial dissipation and at large throttle valve openings the air-fuel mixture is caused to flow through both of said small end large flow area passages to said intake port whereby air-fuel mixture is delivered to said intake port throughout the range of throttle valve openings by the cooperation between said throttle valve and said small and large flow area passages while the pressure upstream of said throttle valve and adjacent said intake port is maintained substantially atmosphereic by virtue of said short throttled portion to minimize engine pumping loss.