Method of controlling continuously variable transmission and control system
First Claim
1. A method of controlling a continuously variable transmission that generates belt clamping pressure supplied to a secondary pulley from line pressure generated by controlling oil pressure of an oil pressure source, comprising:
- a belt clamping pressure-learning step of performing learning correction of a belt clamping pressure command value based on the belt clamping pressure command value and an actual belt clamping pressure value; and
a line pressure-learning step of performing learning correction of a line pressure command value based on the line pressure command value and an actual line pressure value.
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Abstract
An oil pressure-learning method which enables an oil pressure control system that controls line pressure and belt clamping pressure by oil pressure actuators independently of each other, to accurately control both the line pressure and the belt clamping pressure. The oil pressure-learning method is applied to an oil pressure control system provided with a line pressure control solenoid for controlling a line pressure control valve, and a belt clamping pressure control solenoid for controlling a belt clamping pressure control valve. A belt clamping pressure command value that is outputted to the belt clamping pressure control solenoid as a control command value of belt clamping pressure, and a line pressure command value that is outputted to the line pressure control solenoid as a control command value of line pressure are learned in advance. This enables the oil pressure control system to control both the line pressure and the belt clamping pressure with accuracy.
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Citations
23 Claims
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1. A method of controlling a continuously variable transmission that generates belt clamping pressure supplied to a secondary pulley from line pressure generated by controlling oil pressure of an oil pressure source, comprising:
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a belt clamping pressure-learning step of performing learning correction of a belt clamping pressure command value based on the belt clamping pressure command value and an actual belt clamping pressure value; and
a line pressure-learning step of performing learning correction of a line pressure command value based on the line pressure command value and an actual line pressure value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A control system for a continuously variable transmission, comprising:
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a line pressure command value-calculating section that calculates a line pressure command value for controlling a valve that is used for generating line pressure from oil pressure of an oil pressure source;
a belt clamping pressure command value-calculating section that calculates a belt clamping pressure command value for controlling a valve that is used for generating belt clamping pressure supplied to a secondary pulley, from the line pressure;
a belt clamping pressure correction value-calculating section that performs learning correction of the belt clamping pressure command value based on the belt clamping pressure command value and an actual belt clamping pressure value; and
a line pressure correction value-calculating section that performs learning correction of the line pressure command value based on the line pressure command value and an actual line pressure value. - View Dependent Claims (22, 23)
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Specification