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Current content: 159 679 824 patent documents

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164 112 new documents added

576 445 documents amended

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EP 1290350 A1 20030312 - ROBUST SERVO/HYDRAULIC CONTROL SYSTEM AND METHOD

Title (en)

ROBUST SERVO/HYDRAULIC CONTROL SYSTEM AND METHOD

Title (de)

ROBUSTES SERVOHYDRAULISCHES REGELSYSTEM UND VERFAHREN

Title (fr)

SYSTEME ET PROCEDE ROBUSTES DE SERVOCOMMANDE HYDRAULIQUE

Publication

EP 1290350 A1 20030312 (EN)

Application

EP 00970891 A 20001013

Priority

US 0028408 W 20001013
US 15939399 P 19991014

Abstract (en)

[origin: WO0127478A1] A servo control for a cam phaser (10) includes a pulse width modulated controller (20) that operates a four way solenoid valve (18). The cam phaser piston (12) or vane(s) are positioned with a computer program stored in the controller (20). The program establishes a deadband to exclude noise. It compensates for variations in oil temperature and voltage.

IPC 1-7

F15B 9/09; F01L 1/34

IPC 8 full level

F01L 1/34 (2006.01); F15B 9/09 (2006.01)

CPC (source: EP)

F01L 1/34 (2013.01); F15B 9/09 (2013.01); F01L 2001/3443 (2013.01)

Citation (search report)

See references of WO 0127478A1

Designated contracting state (EPC)

DE FR GB

DOCDB simple family (publication)

WO 0127478 A1 20010419; EP 1290350 A1 20030312

DOCDB simple family (application)

US 0028408 W 20001013; EP 00970891 A 20001013