Method of controlling fluid flow rate using on-off type electrom

Details Method of controlling fluid flow rate using on-off type electrom Method of controlling fluid flow rate using on-off type electrom

1980-03-20

1982-04-20

Cohan, Alan

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

137 1, 13762415, 1374875, F02M 2506

Patent

active

043253474

ABSTRACT:
In a method of controlling the rate of flow of a fluid by using an electromagnetic flow control valve of the on-off functioning type and by operating this valve with a pulse signal of which duty is regulated, the flow rate is minimized or maximized by making the duty of the pulse signal slightly greater than 0%, e.g. 2%, or slightly smaller than 100%, e.g. 98%, instead of making it 0% or 100% as in conventional control methods. A principal advantage of such shifting of the minimum and maximum duty values respectively from 0% and 100% is the possibility of easily discriminating a failure, for example, in the supply of the pulse signal from proper minimization or maximization of the duty of the pulse signal.

REFERENCES:
patent: 2741088 (1956-04-01), Andrews
patent: 3476128 (1969-11-01), Barker
patent: 3800794 (1974-04-01), Georgi
patent: 4018241 (1977-04-01), Sodal
patent: 4170973 (1979-10-01), Nohira

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