Split engine operation

Claim 2

A charge forming device for split engine operation of an internal combustion engine having an N number of cylinders supplied by separate fuel injectors, said system comprising, a first air induction system having a first intake passage to N/2 of the cylinders, a second air induction system including a second intake passage and an air spoiler port to the remaining N/2 cylinders, a throttle shaft journalled to extend through said first and second intake passages, a first throttle valve and a second throttle valve oppositely offset mounted on said throttle shaft for respectively controlling the flow of air through said first intake passage and said second intake passage, an automatic throttle blade angle positioning means connected to said throttle shaft for effecting a throttle valve position angle correction when the engine shifts from between an N/2 cylinder and an N cylinder mode of operation and, a manifold pressure responsive spoiler valve means, responsive to manifold pressure in said first air induction passage downstream of said first throttle valve, positioned to control the flow of air through said spoiler port for shifting the operation of the engine between N/2 cylinder operation and N cylinder operation.

Claim 3

A charge forming device for an internal combustion engine having an N number of cylinders supplied by separate fuel injectors comprising, a first induction system having a first intake passage to N/2 of the cylinders, a second air induction system including a second intake passage and an air spoiler port passage to the remaining N/2 cylinders, a throttle shaft journalled in position to extend through said first intake passage and said second intake passage, a first throttle valve and a second throttle valve mounted on said throttle shaft for respectively controlling the flow of air through said first intake passage and said second intake passage, throttle valve angle positioning means operatively connected to said throttle shaft for automatically positioning said first throttlE valve and said second throttle valve when the engine shifts between an N/2 cylinder mode of operation and an N cylinder mode of operation, a pressure responsive spoiler valve means, responsive to manifold pressure in said first air induction passage downstream of said first throttle valve, positioned to control the flow of air through said spoiler port passage and, means actuated by said pressure responsive spoiler valve means to control the operation of the fuel injectors to said remaining N cylinders.

Claim 4

A charge forming device for an internal combustion engine having an N number of cylinders supplied by separate fuel injectors comprising, a first induction system having a first intake passage to N/2 of the cylinders, a second air induction system including a second intake passage and an air spoiler port passage to the remaining N/2 cylinders, a throttle shaft journalled in position to extend through said first intake passage and said second intake passage, a first throttle valve and a second throttle valve mounted on said throttle shaft for respectively controlling the flow of air through said first intake passage and said second intake passage, throttle valve angle positioning means operatively connected to said throttle shaft for automatically positioning said first throttlE valve and said second throttle valve when the engine shifts between an N/2 cylinder mode of operation and an N cylinder mode of operation, a pressure responsive spoiler valve means, responsive to manifold pressure in said first air induction passage downstream of said first throttle valve, positioned to control the flow of air through said spoiler port passage and, means actuated by said pressure responsive spoiler valve means to control the operation of the fuel injectors to said remaining N cylinders.

Claim 5

A charge forming device according to claim 2 wherein said throttle valve angle positioning means includes a lever fixed to said throttle shaft and a throttle lever means pivotally supported relative to said throttle shaft and having a fixed stop thereon positioned for engagement with said lever and a movable stop positioned for engagement with said lever.

Claim 6

A charge forming device according to claim 3 wherein said throttle lever means includes a throttle lever pivotally supported relative to said throttle shaft and having said fixed stop thereon, a differentiator lever pivotally mounted on said throttle lever and forming said movable stop, a fixed cam means and, a cam follower mounted on said differentiator lever for engagement with said cam means to effect pivotal movement of said differentiator lever on said throttle lever upon pivotal movement of said throttle lever.

Claim 7

A charge forming device according to claim 2 wherein said pressure responsive spoiler valve means includes a valve means movable from a first position blocking the flow of air through said spoiler port passage to a second position unblocking said spoiler port passage, spring means operatively connected to said valve means to normally bias said valve means to said first position, and manifold pressure responsive actuator means operatively connected to said valve means to effect movement of said valve means from said first position to said second position.

Claim 8

A charge forming device according to claim 5 wherein said pressure responsive spoiler valve means includes a housing and wherein said manifold pressure responsive actuator means includes a diaphragm and piston assembly mounted in said housing and forming therewith a chamber, means connecting said chamber to said first air induction passage downstream of said first throttle valve and, spring biased detent means associated with said diaphragm and piston assembly and with said housing to releasably retain said valve means in said second position.

Claim 9

A charge forming device according to claim 5 wherein said means actuated by said pressure responsive spoiler valve means is operatively connected to said valve means for interrupting the operation of the fuel injectors to said remaining N/2 cylinders when said valve means is moved from said first position to said second position.