Dual pump regulator system for a motor vehicle transmission
First Claim
1. An apparatus for controlling fluid flow in a motor vehicle transmission, comprising:
- a first pump driven by an input shaft of the transmission to supply fluid from a source of fluid to at least one friction engagement device via a first fluid passageway,a second pump driven by the input shaft of the transmission to normally supply fluid from the source of fluid to a lubrication and cooling sub-system of the transmission via a second fluid passageway,a first valve fluidly coupled between the first and second fluid passageways and directing fluid from the second fluid passageway to the first fluid passageway when fluid pressure in the second fluid passageway is greater than fluid pressure in the first fluid passageway by at least a threshold pressure amount, anda second valve fluidly coupled to the first and second fluid passageways and to the lubrication and cooling sub-system, the second valve blocking the first and second fluid passageways from the lubrication and cooling sub-system when a flow rate of the fluid in the first fluid passageway is less than a first threshold fluid flow rate, a temperature of the fluid is greater than a temperature threshold and a fluid flow demand is greater than a fluid flow demand threshold such that fluid pressure in the second fluid passageway exceeds the fluid pressure in the first fluid passageway by at least the threshold pressure amount, whereby fluid is supplied by the first and second pumps only to the at least one friction engagement device via the first fluid passageway.
1 Assignment
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Accused Products
Abstract
An apparatus and method are disclosed for controlling fluid flow in a motor vehicle transmission. At least one friction engagement device is fluidly coupled to a first pump, and a lubrication and cooling sub-system is normally fluidly coupled to a second pump. Illustratively, when a flow rate of the fluid in the first fluid passageway is less than a threshold fluid flow rate, a temperature of the fluid is greater than a temperature threshold and a fluid flow demand is greater than a fluid flow demand threshold, fluid flow from the second pump to the lubrication and cooling sub-system is blocked and fluid supplied by the second pump is instead directed to the at least one friction engagement device such that fluid is supplied by both the first and second pumps only to the at least one friction engagement device.
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Citations
20 Claims
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1. An apparatus for controlling fluid flow in a motor vehicle transmission, comprising:
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a first pump driven by an input shaft of the transmission to supply fluid from a source of fluid to at least one friction engagement device via a first fluid passageway, a second pump driven by the input shaft of the transmission to normally supply fluid from the source of fluid to a lubrication and cooling sub-system of the transmission via a second fluid passageway, a first valve fluidly coupled between the first and second fluid passageways and directing fluid from the second fluid passageway to the first fluid passageway when fluid pressure in the second fluid passageway is greater than fluid pressure in the first fluid passageway by at least a threshold pressure amount, and a second valve fluidly coupled to the first and second fluid passageways and to the lubrication and cooling sub-system, the second valve blocking the first and second fluid passageways from the lubrication and cooling sub-system when a flow rate of the fluid in the first fluid passageway is less than a first threshold fluid flow rate, a temperature of the fluid is greater than a temperature threshold and a fluid flow demand is greater than a fluid flow demand threshold such that fluid pressure in the second fluid passageway exceeds the fluid pressure in the first fluid passageway by at least the threshold pressure amount, whereby fluid is supplied by the first and second pumps only to the at least one friction engagement device via the first fluid passageway. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus for controlling fluid flow in a motor vehicle transmission including at least one friction engagement device and a fluid-using sub-system separate from and addition to the at least one friction engagement device, the apparatus comprising:
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a first pump driven by an input shaft of the transmission to supply fluid from a source of fluid to the at least one friction engagement device via a first fluid passageway and to normally supply fluid from the source of fluid to the fluid-using sub-system via the first fluid passageway, a second pump driven by the input shaft of the transmission to normally supply fluid from the source of fluid to a lubrication and cooling sub-system of the transmission via a second fluid passageway, a first valve fluidly coupled between the first and second fluid passageways and directing fluid from the second fluid passageway to the first fluid passageway when fluid pressure in the second fluid passageway is greater than fluid pressure in the first fluid passageway by at least a threshold pressure amount, and a second valve fluidly coupled to the first and second fluid passageways, to the fluid-using sub-system and to the lubrication and cooling sub-system, the second valve blocking the first and second fluid passageways from the lubrication and cooling sub-system and fluidly coupling the first fluid passageway to the fluid-using sub-system when a flow rate of the fluid in the first fluid passageway is less than a first threshold fluid flow rate, a temperature of the fluid is greater than a temperature threshold and a fluid flow demand is greater than a fluid flow demand threshold such that fluid pressure in the second fluid passageway exceeds the fluid pressure in the first fluid passageway by at least the threshold pressure amount, whereby fluid is supplied by the first and second pumps only to the at least one friction engagement device and to the fluid-using sub-system via the first fluid passageway.
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Specification