BELT‑BASED, CONTINUOUSLY-VARIABLE TRANSMISSION CONTROL DEVICE AND CONTROL METHOD

Title:

BELT‑BASED, CONTINUOUSLY-VARIABLE TRANSMISSION CONTROL DEVICE AND CONTROL METHOD

Document Type and Number:

WIPO Patent Application WO/2010/125668

Kind Code:

A1

Abstract:

Provided are a belt‑based, continuously-variable transmission control device and a control method with which control stability of secondary hydraulic pressure can be improved while assuring estimation accuracy of the belt slippage state during belt slippage control. The device has a primary pulley (42), a secondary pulley (43), and a belt (44), and is also provided with a secondary hydraulic pressure control unit (92) that determines the instructed secondary hydraulic pressure using feedback based on the deviation (θ) between the set point secondary hydraulic pressure and the actual hydraulic pressure, and that controls the secondary hydraulic pressure to the secondary pulley (43). A belt‑based, continuously-variable transmission mechanism (4) is provided with a belt, slippage control means (Figure 8) that estimates belt slippage by monitoring the phase difference (θ) between a vibration component included in the actual secondary hydraulic pressure and a vibration component included in the actual transmission gear ratio and that executes control to reduce the actual secondary hydraulic pressure to maintain a prescribed belt slippage state based on said estimation. The secondary hydraulic pressure control unit (92) suspends feedback control of the secondary hydraulic pressure and controls the secondary hydraulic pressure using open-loop control during belt slippage control.

Inventors:

DOIHARA KATSUMI (JP)
KODAMA YOSHIHISA (JP)
YOSHIKAWA YASUAKI (JP)
NISHI MASAHIRO (JP)
KOYAMA KEISUKE (JP)
NAKAMURA KENTA (JP)
SAWANO KIYOTAKA (JP)
KAWAGUCHI HIDEMASA (JP)

Application Number:

PCT/JP2009/058461

Publication Date:

November 04, 2010

Filing Date:

April 30, 2009

Export Citation:

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Assignee:

JATCO LTD (JP)
NISSAN MOTOR (JP)
DOIHARA KATSUMI (JP)
KODAMA YOSHIHISA (JP)
YOSHIKAWA YASUAKI (JP)
NISHI MASAHIRO (JP)
KOYAMA KEISUKE (JP)
NAKAMURA KENTA (JP)
SAWANO KIYOTAKA (JP)
KAWAGUCHI HIDEMASA (JP)

International Classes:

F16H61/02; F16H59/46; F16H59/70; F16H61/662

Domestic Patent References:

WO2009007450A2	2009-01-15
WO2009007450A2	2009-01-15

Foreign References:

JP2003065428A	2003-03-05
JP2004293652A	2004-10-21
JP4013578B

Other References: