Measuring and testing – Simulating operating condition – Marine
Patent
1989-03-28
1990-05-08
Myracle, Jerry W.
Measuring and testing
Simulating operating condition
Marine
7386129, G01M 1500
Patent
active
049227505
ABSTRACT:
A method for measuring high flow rates, particularly for the intake air for motor vehicle drives, includes the steps of modulating an oscillator signal, transmitting the modulated oscillator signal via two paths, with at least one of the paths passing through the flow path to be measured and the interacting with the fluid flow so that the signal in that path is phase-shifted by an amount dependent on the flow rate, separately receiving the signals from the two paths, comparing the received signals by phase discrimination to obtain a signal corresponding to the phase difference in the signals from the two paths, and deriving a signal corresponding to the flow rate from the phase difference. One or both of the signal paths can be an ultrasonic transmisson path. If the phase discrimination takes place in a phase discriminator which has an unstable range of operation, corrective steps can be taken so that the phase discrimination necessary for the method is moved out of the unstable range.
REFERENCES:
patent: 2911826 (1959-11-01), Kritz
patent: 4240292 (1980-12-01), Zalessky et al.
Myracle Jerry W.
Siemens Aktiengesellschaft
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