Image heating apparatus including PID control

Details Image heating apparatus including PID control Image heating apparatus including PID control

2005-03-08

2008-03-25

Gray, David M. (Department: 2852)

Electrophotography

Control of electrophotography process

Control of fixing

Reexamination Certificate

active

07349642

ABSTRACT:
PID control performs integral control using an integral value of a deviation between a set temperature and current temperature. In particular, when a proportionality factor Kp is large, a fixing belt reaches a target temperature quickly but overshoot increases. On the other hand, when the proportionality factor Kp is small, the output is reduced gradually, and therefore the fixing belt reaches a target temperature slowly but the overshoot is small. Thus, a heat value control section changes the control value of the PID control according to the temperature (belt temperature) of a fixing belt at the start of heating as detected by a temperature detector. More specifically, a proportionality factor Kp of a calculation expression of the PID calculation is changed according to the belt temperature of the fixing belt. This makes it possible to reduce an overshoot when the temperature of the fixing belt increases.

REFERENCES:
patent: 2004/0037580 (2004-02-01), Ohta
patent: 2006/0083530 (2006-04-01), Bartley et al.
patent: 2007/0036570 (2007-02-01), Tatematsu et al.
patent: 2001-222191 (2001-08-01), None
English Language Abstract of JP 2001-222191.
U.S. Appl. No. 10/765,974 to Nonaka et al., filed Jan. 29, 2004.

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