Hydraulic pressure sensor failure control system for...

Details Hydraulic pressure sensor failure control system for... Hydraulic pressure sensor failure control system for...

2007-03-20

2007-03-20

Johnson, Vicky A. (Department: 3682)

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

Fluid pressure actuator for adjustment of member

Reexamination Certificate

active

10647900

ABSTRACT:
In case a primary hydraulic pressure sensor is normal, when reverse rotation of pulleys is detected a primary pulley (Plpri) torque capacity is calculated from a primary pressure detected by the primary hydraulic pressure sensor. When the primary hydraulic pressure sensor fails, a secondary hydraulic pressure sensor is checked, and when the secondary hydraulic pressure sensor is normal, the PLpri torque capacity is determined from a secondary pressure detected by the secondary hydraulic pressure sensor by using a map. On the other hand, when the secondary hydraulic pressure sensor fails too, the PLpri torque capacity is read out from the map by using a secondary pressure target value as the secondary pressure.

REFERENCES:
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patent: 5188007 (1993-02-01), Hattori et al.
patent: 6591177 (2003-07-01), Loffler
patent: 6623386 (2003-09-01), Mizui
patent: 2001/0049315 (2001-12-01), Tsutsui
patent: 2002/0037788 (2002-03-01), Hagiwara et al.
patent: 2004/0110584 (2004-06-01), Sawada et al.
patent: 199 52 476 (2001-05-01), None
Relevant portion of European Search Report for corresponding application EP 03 25 5082.

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