METHOD AND DEVICE FOR CONTROLLING THE OIL SUPPLY OF AN AUTOMATIC GEARBOX AND A STARTING ELEMENT
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Accused Products
Abstract
A method and a device for controlling the oil supply of an automatic transmission (gearbox) and to a starting element. The method can guarantee a sufficient supply of oil to a hydraulic control unit of the automatic transmission and/or the starting element, in particular an oil-cooled friction clutch, both during the operation of the internal combustion engine (4) and when the latter is at a standstill with the aid of an oil pump (2) that can be mechanically driven by the internal combustion engine (4) and a second oil pump (3) that can be electrically driven. In addition, the cooling oil supply of the starting element is guaranteed by the provision of a low-pressure oil by way of the electrically driven oil pump (3), at least during the starting operation, the stream cooling the starting element (11).
69 Citations
48 Claims
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1-24. -24. (canceled)
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25. A method of controlling a supply of oil to an automatic transmission and a starting element of a vehicle, the method comprising the steps of:
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providing at least first and second oil pumps (2, 3) for suppling oil to at least one of a hydraulic control device of the automatic transmission and the starting element (11); mechanically driving the first oil pump (2) with an internal combustion engine (4) to provide an oil flow to a high pressure branch (14) of an oil supply assembly; electrically driving the second oil pump (3) to provide oil to the hydraulic control device at least when the internal combustion engine (4) is inactive and during at least one other operating condition; and cooling the starting element (11) with an oil flow, provided by at least the electrically driven second oil pump (3) at least during a starting procedure of the vehicle, the electrically driven second oil pump (3) providing pressure to a low pressure branch (15) of the oil supply assembly. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. An assembly for controlling oil supply to an automatic transmission and a starting element of a vehicle the assembly comprising:
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a first oil pump (2), located within a high pressure branch (14), being mechanically driven by an internal combustion engine (4) to supply an oil flow under high pressure; a second oil pump (3), located within a low pressure branch (15), being electrically driven by an electric motor (5) to supply an oil flow under low pressure; a pressure regulator (8), located within the high pressure branch (14), for shifting at least one transmission shifting element; an oil cooler (12), transmission lubrication elements (10), and a starting element cooler (11) being are located within the low pressure branch (15); a high pressure valve (6), located within the main pressure line (14), for adjusting the oil flow under high pressure supplied by the first oil pump (2); and a connecting line (16) being to a low pressure outlet of the high pressure valve (6) and the low pressure branch (15) such that the high pressure branch (14) being connected to the low pressure branch (15). - View Dependent Claims (46, 47, 48)
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Specification