CALCULATION DEVICE FOR LEAKAGE RATE IN CONTINUOUSLY VARIABLE TRANSMISSION AND CONTINUOUSLY VARIABLE TRANSMISSION CONTROLLER INCLUDING IT

摘要

PROBLEM TO BE SOLVED: To accurately calculate a leakage rate in an oil chamber of a continuously variable transmission. ;SOLUTION: When a flow control valve is inoperative, a rate Qcheck(n) of fluid flowing into a primary oil chamber through a check valve is calculated by using a physical model (S106). A total rate Q1real of fluid flowing in and out of the primary oil chamber is calculated based on variation of gear ratio γ(n) (S109). The leakage rate Qdrain is calculated from a difference between an average of Qcheck(n) and Q1real (S111). A seal gap area Ap is calculated by using the physical model. This allows accurate calculation of the seal gap area Ap having manufacturing variation and allows accurate and easy grasp of a leakage rate characteristic.;COPYRIGHT: (C)2004,JPO