OIL PRESSURE CONTROL DEVICE FOR BELT-TYPE CONTINUOUSLY VARIABLE TRANSMISSION
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Accused Products
Abstract
There is provided an oil pressure control device for a belt-type continuously variable transmission which includes two pulleys and a belt, wherein each of the two pulleys has a movable sheave which moves by oil pressure supplied to a hydraulic chamber, wherein the oil pressure control device calculates a request torque according to a running state, wherein when calculating the oil pressure which is supplied to the hydraulic chamber of the movable sheave on the basis of the request torque, the oil pressure control device reduces the request torque if the request torque is greater by a predetermined value or more than an actual input torque which is inputted to the belt-type continuously variable transmission. Accordingly, it is possible to provide an oil pressure control device for a belt-type continuously variable transmission with which undesirable vibration can be avoided by means of stable speed-ratio control.
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Citations
10 Claims
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1-5. -5. (canceled)
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6. An oil pressure control device for a belt-type continuously variable transmission,
wherein the belt-type continuously variable transmission includes two pulleys and a belt provided between the two pulleys and wound around the two pulleys to transmit motive power, each of the two pulleys has a movable sheave which moves by oil pressure supplied to a hydraulic chamber, and the oil pressure control device is configured to calculate a request torque according to a running state, to calculate the oil pressure which is supplied to the hydraulic chamber, on the basis of the request torque, to calculate an actual input torque which is inputted to the belt-type continuously variable transmission, and to reduce the request torque if the request torque is greater than the actual input torque by a predetermined value or more.
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7. An oil pressure control device for a belt-type continuously variable transmission,
wherein the belt-type continuously variable transmission includes two pulleys and a belt provided between the two pulleys and wound around the two pulleys to transmit motive power, and each of the two pulleys has a movable sheave which moves by oil pressure supplied to a hydraulic chamber, the oil pressure control device comprising: -
a request torque calculating section that calculates a request torque according to a running state; an oil pressure calculating section that calculates the oil pressure which is supplied to the hydraulic chamber, on the basis of the request torque; an actual input-torque calculating section that calculates an actual input torque which is inputted to the belt-type continuously variable transmission; and a correcting section that corrects the request torque such that the request torque is reduced if the request torque is greater than the actual input torque by a predetermined value or more. - View Dependent Claims (8, 9, 10)
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Specification