Duty ratio control method for on-off type solenoid valves

Details Duty ratio control method for on-off type solenoid valves Duty ratio control method for on-off type solenoid valves

1984-06-22

1985-07-16

Lall, Parshotam S.

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

F02M 2506

Patent

active

045289689

ABSTRACT:
A valve opening duty ratio determining the valve opening period of an on-off type solenoid valve is calculated as a function of at least one control parameter, each time a pulse of a predetermined timing signal is generated. A valve closing duty ratio determining the valve closing period of the solenoid valve is calculated when the calculated valve opening duty ratio is larger than a predetermined value. A pulse of a reference control signal is generated after completion of the calculation of the valve opening duty ratio or the valve closing duty ratio. Time elapsed after generation of the reference control signal pulse is measured. When the calculated valve opening duty ratio is smaller than a predetermined value, the solenoid valve is opened for a period of time after generation of the above reference control signal pulse and until the elapsed time measured reaches a value corresponding to the calculated valve opening duty ratio. When the calculated valve opening duty ratio is larger than the predetermined value, the valve is closed for a period of time after generation of the reference control signal pulse and until the elapsed time measured reaches a value corresponding to the calculated valve closing duty ratio.

REFERENCES:
patent: 4164206 (1979-08-01), Toelle
patent: 4173205 (1979-11-01), Toelle
patent: 4233947 (1980-11-01), Abo
patent: 4380988 (1983-04-01), Otsuka et al.
patent: 4448177 (1984-05-01), Hasegawa et al.
patent: 4452217 (1984-06-01), Kawamura et al.
patent: 4462378 (1984-07-01), Atago et al.

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