Electronically controlled exhaust gas recirculation apparatus

Internal-combustion engines – Charge forming device – Crankcase vapor used with combustible mixture

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Details

123568, 123569, F02M 2506

Patent

active

044637411

ABSTRACT:
Vacuum is applied to a pair of vacuum chambers on opposite sides of a diaphragm of an EGR valve and air flow rates from the pair of Vacuum Chambers are determined by a duty factor of an electrical control signal. A plunger driven by the diaphragm and a slit mechanism which changes its opening area in accordance with a change of stroke of the plunger are arranged in the EGR valve and the diaphragm is stopped at an equilibrium position of the pressures of the pair of vacuum chabers. The stroke of the EGR valve thus can be exactly controlled only by the control signal.

REFERENCES:
patent: 4009700 (1977-03-01), Engels et al.
patent: 4066056 (1978-01-01), Nohira et al.
patent: 4130094 (1978-12-01), Gropp
patent: 4280470 (1981-07-01), Ueda
patent: 4333438 (1982-06-01), Perez et al.

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