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US 5,765,525 AGranted
Intake system for an internal combustion engine
AssigneeFord Global Technologies, LLC
InventorThomas Tsoi-Hei Ma
Life of this patent
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AssigneeFord Global Technologies, LLC
InventorThomas Tsoi-Hei Ma
Estimating the term…
An intake system is described for a spark ignition internal combustion engine having ports per cylinder, which may lead to a common intake valve or two separate intake valves. One of the intake ports (12) is shaped to direct a first flow tangentially near the outer periphery of the cylinder and the other intake port (20) is shaped to direct a second, swirling, flow towards the center of the cylinder. The second swirling flow has the same direction of rotation as that of the first flow. Injectors (28) are provided for introducing fuel into the second swirling flow thereby producing within the cylinder a charge that is radially stratified with a combustible mixture concentrated near the center of the cylinder. The flow rates through the two intake ports may be varied independently and the relative angular momentum of the two flows at the boundary between the two flows in the cylinder determines the degree of mixing between the two flows, such mixing being operative to decrease the degree of stratification of the charge within the cylinder.
An intake system for a spark ignition internal combustion engine of the type having two intake valves (10,20) per cylinder, the intake system comprising two intake ports (12,21) per cylinder, each associated with a respective intake valve (10,20), one of the intake ports (12) being shaped to direct a first flow tangentially near the outer periphery of the cylinder (2) and the other intake port (21) being shaped to direct a second, swirling, flow towards the center of the cylinder, the second swirling flow having the same direction of rotation as that of the first flow, means (28) for introducing fuel into the second swirling flow thereby producing within the cylinder a charge that is radially stratified with a combustible mixture concentrated near the center of the cylinder, and means (16,26) for independently varying the flow rates through the two intake ports (12,21) in order to vary the degree of stratification of the charge within the cylinder.
An intake system for a spark ignition internal combustion engine of the type having one intake valve (110) per cylinder, the intake system comprising two intake ports (114,116) per cylinder (102), both the intake ports (114,116) being connected to a common intake valve (110) with each port discharging through adjacent sides of the intake valve (110), one of the intake ports (114) being shaped to direct a first flow tangentially near the outer periphery of the cylinder (102) and the other intake port (116) being shaped to direct a second, swirling, flow towards the center of the cylinder, the second swirling flow having the same direction of rotation as that of the first flow, means (128) for introducing fuel into the second swirling flow thereby producing within the cylinder a charge that is radially stratified with a combustible mixture concentrated near the center of the cylinder, and means (120,122) for independently varying the flow rates through the two intake ports, the relative angular momentum of the two flows at the boundary between the two flows in the cylinder determining the degree of mixing between the two flows, which mixing is operative to decrease the degree of stratification of the charge within the cylinder.
Dependencies are inferred from the claim text.