Mary Y Huang

US Patent:

7109608, Sep 19, 2006

Filed:

Sep 11, 2002

Appl. No.:

10/241124

Inventors:

Yixin Yao - Ann Arbor MI, US
Bing Zheng - Dublin OH, US
Mary Yi-Yang Huang - Troy MI, US

Assignee:

Visteon Global Technologies, Inc. - Van Buren Township MI

International Classification:

H01H 9/54
G05B 11/42
G05B 13/02

US Classification:

307112, 307139, 318609, 700 41

Abstract:

A bi-directional smooth transition switch with bumpless transfer is disclosed. It is composed of two feedback loops, each with feedback and forward-loop compensators. During loop operation, one feedback loop is active, while the other is inactive. The smooth transition switch operates in the following manner. The switch output is measured. Next, an error signal is formed as the difference between the forward-loop compensator output and the switch output, which is fed to the input of a high gain feedback compensator. The output of the feedback compensator is a feedback signal. When no switching occurs, the feedback signal remains zero in the active loop, and the output signal of the inactive loop will track the output signal of the active loop. When the switchover occurs, the inactive loop will replace the original active loop and provide smooth transition switch's output.

US Patent:

6640167, Oct 28, 2003

Filed:

Feb 25, 2003

Appl. No.:

10/374820

Inventors:

Deanna L. Carroll - Westland MI
Bing Zheng - Dublin OH
Mary Y. Huang - Troy MI

Assignee:

Visteon Global Technologies, Inc. - Dearborn MI

International Classification:

G01M 1700

US Classification:

701 34, 701 43, 701 42, 701 41

Abstract:

The present invention involves a system and method of implementing a fault detection and management system for road wheel position sensor faults of a vehicle steer-by-wire system. The method comprises providing primary and secondary road wheel position sensors configured to generate road wheel angle signals indicative of a road wheel angle to a microprocessor. The primary road wheel sensor is in an active control mode and the secondary road wheel sensor is in a stand-by control mode within the steer-by-wire system. The method further includes receiving road wheel angle signals from the primary and secondary sensors, and detecting a fault based on the road wheel angle signals from the primary and secondary sensors. The method further includes calculating an estimated road wheel angle based on a vehicle variable and comparing the primary sensor signal with the estimated road wheel angle. The method further includes managing control of the system based on the comparison of the primary sensor signal with the estimated road wheel angle.