Hydraulic control for automatic transmission
First Claim
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1. A hydraulic control system for an automatic transmission with a wet clutch serving as a start element and points to be lubricated, comprising:
- a lubrication passage which feeds a lubricating oil to the wet clutch and the points of the transmission;
a first passage with a large-diameter orifice;
a second passage with a small-diameter orifice, the first and second passages being arranged upstream of the lubrication passage;
a switching valve which switches fluid communication between the lubrication passage and the first and second passages;
a distribution controller which controls the switching valve; and
an electronic control unit (ECU) which controls the distribution controller.
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Abstract
A hydraulic control system for an automatic transmission includes a lubrication passage for feeding lubricating oil to a wet clutch and lubrication points of the transmission, first and second passages with a large-diameter orifice and a small-diameter orifice, respectively, arranged upstream of the lubrication passage, a switching valve for switching fluid communication between the lubrication passage and the first and second passages, a solenoid for controlling the switching valve, and an ECU for controlling the solenoid.
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Citations
26 Claims
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1. A hydraulic control system for an automatic transmission with a wet clutch serving as a start element and points to be lubricated, comprising:
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a lubrication passage which feeds a lubricating oil to the wet clutch and the points of the transmission;
a first passage with a large-diameter orifice;
a second passage with a small-diameter orifice, the first and second passages being arranged upstream of the lubrication passage;
a switching valve which switches fluid communication between the lubrication passage and the first and second passages;
a distribution controller which controls the switching valve; and
an electronic control unit (ECU) which controls the distribution controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A hydraulic control system for an automatic transmission with a wet clutch serving as a start element and points to be lubricated, comprising:
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a lubrication passage which feeds a lubricating oil to the wet clutch and the points of the transmission;
a switching valve which switches fluid communication to the wet clutch and the points of the transmission;
a distribution controller which controls the switching valve;
a cooler arranged on the lubrication passage, the cooler cooling down the lubricating oil;
a pressure regulator valve arranged on the lubrication passage upstream of the cooler, the pressure regulator valve regulating a pressure of the lubricating oil;
a pressure controller which controls the pressure regulator valve; and
an electronic control unit (ECU) which controls the distribution controller and the pressure controller.
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18. A method of controlling a hydraulic system for an automatic transmission with a wet clutch serving as a start element and points to be lubricated, the system comprising:
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a lubrication passage which feeds a lubricating oil to the wet clutch and the points of the transmission;
a first passage with a large-diameter orifice;
a second passage with a small-diameter orifice, the first and second passages being arranged upstream of the lubrication passage;
a switching valve which switches fluid communication between the lubrication passage and the first and second passages; and
a distribution controller which controls the switching valve, the method comprising;
determining whether or not a vehicle is at a standstill;
determining, when the vehicle is at a standstill, whether or not a temperature of the lubricating oil is equal to or smaller than a first predetermined temperature; and
controlling, when the temperature is equal to or smaller than the first predetermined temperature, the distribution controller to control the switching valve so as to shut off fluid communication between the lubrication passage and the first and second passages. - View Dependent Claims (19, 20, 21, 22)
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23. A method of controlling a hydraulic system for an automatic transmission with a wet clutch serving as a start element and points to be lubricated, the system comprising:
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a lubrication passage which feeds a lubricating oil to the wet clutch and the points of the transmission;
a switching valve which switches fluid communication to the wet clutch and the points of the transmission;
a distribution controller which controls the switching valve;
a cooler arranged on the lubrication passage, the cooler cooling down the lubricating oil;
a pressure regulator valve arranged on the lubrication passage upstream of the cooler, the pressure regulator valve regulating a pressure of the lubricating oil; and
a pressure controller which controls the pressure regulator valve, the method comprising;
determining whether or not a temperature of the lubricating oil is equal to or smaller than a predetermined temperature; and
controlling, when the temperature is equal to or smaller than the predetermined temperature, the pressure controller to set a pressure of the pressure regulator valve at a first value which is smaller than a predetermined value. - View Dependent Claims (24, 25, 26)
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Specification