Duty ratio control method for solenoid control valve means

Details Duty ratio control method for solenoid control valve means Duty ratio control method for solenoid control valve means

1984-06-25

1985-09-10

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Auxiliary air or oxygen added to combustible mixture

123339, 123438, 123571, 91361, 137 2, 137 10, 137 12, 137486, 1374875, F02D 2108, F02D 3300

Patent

active

045399670

ABSTRACT:
A method of controlling the duty ratio of operation of a solenoid control valve in a fluid passage to control the flow rate of fluid in the fluid passage to a desired value. A flow rate value range is divided into a plurality of flow rate value regions between first and second extreme flow rate values which the fluid can assume when the duty ratio assumes corresponding minimum and maximum values. A first predetermined duty ratio value is preset corresponding to each of the divided regions and dependent upon the magnitude of manufacturing variations of the duty ratio-to-flow characteristic of the valve. A second larger predetermined duty ratio value is preset corresponding to each of the divided regions. The duty ratio is set to the second predetermined value or the first predetermined value corresponding to one of the divided regions within which the desired flow rate value falls, when the detected flow rate value is on the side of the first extreme flow rate value or on the side of the second extreme flow rate value adjacent the desired flow rate value, respectively.

REFERENCES:
patent: 4370960 (1983-02-01), Otsuka
patent: 4409948 (1983-10-01), Hasegawa et al.
patent: 4425886 (1984-01-01), Kuroiwa et al.

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