Control device for continuously variable transmission for use in vehicles
First Claim
1. A control device for a continuously variable transmission of a vehicle, the continuously variable transmission including a primary pulley connected to an output shaft side of a power plant, a secondary pulley connected to a driving wheel side, an oil pump arranged to be driven by the power plant, and to supply a hydraulic fluid to the pulleys, and a circular belt member wound around the pulleys, the control device comprising:
- a transmission control unit configured tocontrol a hydraulic pressure of the hydraulic fluid supplied to the pulleys in accordance with a traveling state of the vehicle, and thereby to control a transmission gear ratio of the continuously variable transmission;
control a line pressure which is a base pressure of the hydraulic pressure; and
judge whether a state of a road surface on which the vehicle travels is a smooth road or a rough road,when the road is judged to be rough, perform a rough road corresponding control to increase the hydraulic pressure to a value larger than the hydraulic pressure when the road is judged to be smooth, andwhen a line-pressure-up control condition is satisfied at the rough road judgment, increase the line pressure to be greater than the line pressure when the line-pressure-up control condition is not satisfied.
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Accused Products
Abstract
A control device for a continuously variable transmission of a vehicle includes a shift control section being configured to perform a rough road corresponding control to increase the hydraulic pressure to a value larger than the hydraulic pressure at a smooth road judgment at which the smooth road is judged, at a rough road judgment at which the rough road is judged, and when a line-pressure-up control condition is satisfied at the rough road judgment, the line pressure control section being configured to increase the line pressure to be greater than the line pressure when the line-pressure-up control condition is not satisfied.
9 Citations
11 Claims
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1. A control device for a continuously variable transmission of a vehicle, the continuously variable transmission including a primary pulley connected to an output shaft side of a power plant, a secondary pulley connected to a driving wheel side, an oil pump arranged to be driven by the power plant, and to supply a hydraulic fluid to the pulleys, and a circular belt member wound around the pulleys, the control device comprising:
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a transmission control unit configured to control a hydraulic pressure of the hydraulic fluid supplied to the pulleys in accordance with a traveling state of the vehicle, and thereby to control a transmission gear ratio of the continuously variable transmission; control a line pressure which is a base pressure of the hydraulic pressure; and judge whether a state of a road surface on which the vehicle travels is a smooth road or a rough road, when the road is judged to be rough, perform a rough road corresponding control to increase the hydraulic pressure to a value larger than the hydraulic pressure when the road is judged to be smooth, and when a line-pressure-up control condition is satisfied at the rough road judgment, increase the line pressure to be greater than the line pressure when the line-pressure-up control condition is not satisfied. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification