Solenoid controller with flyback pulses useful for diagnostics a

Details Solenoid controller with flyback pulses useful for diagnostics a Solenoid controller with flyback pulses useful for diagnostics a

1990-09-07

1992-06-09

Raevis, Robert

Measuring and testing

Volume or rate of flow

Mass flow by imparting angular or transverse momentum to the...

G01F 100

Patent

active

051196832

ABSTRACT:
Measurement of fluid flow (or other fluid parameter) through a solenoid-actuated valve (12), and/or measurement of nominal operation of the valve itself, is achieved in one embodiment by modifying the amplitude of flyback pulses (48) generated by the solenoid. The degree of modification preferably varies with the value of the sensed information, and the modified flyback pulses are processed to extract that information from diagnostic and/or control purposes. In another embodiment, a variable impedance is established in the path of the solenoid's recirculation current. For a fraction of the solenoid's recirculation period, the impedance is caused to vary as a function of the value of the sensed information. For the remainder of the recirculation period, the value of the impedance is greatly reduced to maintain the recirculating current at a relatively high level.

REFERENCES:
patent: 4932246 (1990-06-01), Deutsch et al.
Deutsch, "Injector Fault Testing Methods" Motorola Technical Developments, vol. 3, Mar. 1983.
Johnson, "Process Control Instrumentation Technology", pp. 22-23, 1977.

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