Title: Compressor surge control with airflow measurement

Abstract: Surge control systems are provided for compressors which supply air to a pneumatic load. A signal proportional to the pressure ratio of the outlet pressure to the inlet pressure plus a selected reference pressure is compared to a measured weight flow rate of air through the compressor to provide a vent valve command signal. If the measured pressure ratio plus the reference pressure ratio exceeds the measured flow rate, a surge condition may ensue. The vent valve position command signal causes a venting valve to vent a portion of the air provided to the load, which reduces the measured pressure ratio and increases weight flow rate. During normal operation of the compressor, the vent valve command signal is zero for all values of weight flow rate. A transient control channel is provided which is responsive to the rate of change of the measured pressure ratio and/or measured weight flow rate.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Glennon, Timothy F. (Rockford, IL, US)
Sarphie, Theodore E. (Rockford, IL, US)
Faulkner, Dennis T. (Rockford, IL, US)

Application Number: 833031
Filing Date: 1977-09-14
Publication_date: 1979-08-07
Assignee: Sundstrand Corporation (Rockford, IL)
Primary Class(es): 701/100 60/795, 415/17, 415/39
Other Classes:
US Patent Ref:

3138317	Jun, 1964	Jekat	415/148.
3292845	Dec, 1966	Hens et al.	415/17.
3292846	Dec, 1966	Harper et al.	415/17.
3411702	Nov, 1968	Metot et al.	415/27.
3424370	Jan, 1969	Law	415/27.
3852958	Dec, 1974	Adams et al.	340/27.
3867717	Feb, 1975	Moehring et al.	364/431.
3868625	Feb, 1975	Speigner et al.	340/27.
3935558	Jan, 1976	Miller et al.	340/27.
4060980	Dec, 1977	Elsaesser et al.	60/39.
4077203	Mar, 1978	Burnell	60/39.

Other Refs:
Primary Examiner: Gruber, Felix D.
Assistant Examiner:
Attorney: Wegner, Stellman, McCord, Wiles & Wood