CONTROL STRUCTURE FOR ELECTRO-MECHANICAL CAMSHAFT PHASE SHIFTING DEVICE
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United States of America Patent
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Issued Date -
Jan 20, 2011
app pub date -
Dec 4, 2007
filing date -
Dec 5, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A camshaft phase shifting device (30) includes a coaxially arranged three-shaft gear system, having an input shaft (16), an output shaft (14), and a control shaft (34) for adjusting the phase angle between the input and output shafts (16, 14). The control structure is a torque-based control structure. The dynamic response of the gear system and thus the desired phase angle of a camshaft (12) associated with the output shaft (16) is controlled and adjusted by a controller (40) which produces a torque command based on received signals. These signals include, but are not limited to, cam shaft phase angle error signal, torque load, and/or angular position signal of the camshaft (12), and relative speed signal between the input and output shafts (16, 14). The torque command is converted by an electric machine (32) into an electro-magnetic torque exerting on the control shaft (34) of the camshaft phase shifting device (30), and includes two parts, a feed forward part to compensate for the known disturbances in system torques and a feedback part to compensate for unknown disturbances.
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