Compensation circuit for sensor lag to reduce undershoot and ove

Automatic temperature and humidity regulation – With timing element – Timer other than clock

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364557, 374169, G01K 700

Patent

active

048364428

ABSTRACT:
A compensation circuit for sensor lag uses a sensor temperature signal modification circuit to provide a modified sensor temperature signal for subsequent use in controlling the sensed temperature. The compensation circuit digitally compares a current sensor temperature representative signal and a sensor temperature signal at a last or preceeding sample time to produce a difference signal which is converted to a sensor slope signal and is multiplied by a sensor time constant. The resulting signal is passed through a filter to eliminate transient effects and is summed with the original sensor temperature signal to provide a sensed temperature signal for control of the temperature whereby the sensed temperature is a better estimate of the actual environmental temperature controlled by a thermostat utilizing the sensed temperature signal.

REFERENCES:
patent: 4092863 (1978-06-01), Turner
patent: 4254906 (1981-03-01), Hayes
patent: 4489882 (1984-12-01), Rodgers
patent: 4557317 (1985-12-01), Harmon, Jr.
patent: 4615380 (1986-10-01), Beckey
patent: 4671457 (1987-06-01), Berkhof

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