Electricity: measuring and testing – Magnetic – Calibration
Patent
1986-08-26
1988-08-02
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Calibration
73 1J, 123349, 123617, 324208, 364571, G01R 3500, F02M 6500, G01L 2700, G01B 714
Patent
active
047616083
ABSTRACT:
The disclosure illustrates a self calibrating control system for a variable area turbocharger incorporating a pneumatic actuator having a limiting position achieved at low actuating pressure levels. The calibration takes place by monitoring the demanded actuator signal. If it stays at a level reflecting a physically limiting position of the actuator for a predetermined time air pressure to the actuator is terminated to positively maintain the actuator in the no air position. A signal reflecting the actual position of the actuator is then substituted in the control system as a new zero pressure condition. This procedure is performed periodically and is aborted if normal control inputs are demanded thus resulting in a minimum disruption to normal control inputs. In addition the system provides for fault indications if the calibration procedure fails to result in a zero pressure calibration within predetermined limits. The system may be used to alternatively or in addition calibrate for a maximum pressure condition.
REFERENCES:
patent: 4051712 (1977-10-01), Zias et al.
patent: 4181944 (1980-01-01), Yamauchi et al.
patent: 4337516 (1982-06-01), Murphy et al.
patent: 4349885 (1982-09-01), Thompson
patent: 4490804 (1984-12-01), Martinsons
Franklin Philip C.
Ogburn Alan P.
Gron Gary M.
Holset Engineering Company Limited
Loudermilk Alan R.
Ruff Robert T.
Strecker Gerard R.
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