Internal-combustion engines – Charge forming device – Crankcase vapor used with combustible mixture
Patent
1984-02-14
1985-08-13
Lall, Parshotam S.
Internal-combustion engines
Charge forming device
Crankcase vapor used with combustible mixture
F02M 2506
Patent
active
045343349
ABSTRACT:
An exhaust-gas recirculation (EGR) system has a main control device that supplies a control signal to an EGR valve actuating device that opens an EGR valve to a desired extent. Under normal conditions, a pulse actuating signal having a time-width corresponding to a difference between the actual opening of the EGR valve and the desired opening is supplied to the valve actuating device. Then, the next actuating signal is fed to the valve actuating device after a given length of quiescent time. When the desired opening changes suddenly, however, the normal operation is discontinued and an actuating signal corresponding to a new desired opening is supplied to the valve actuating device. By so doing, the EGR valve is at all times opened to the desired extent, not only under normal conditions but also when the desired amount of valve opening changes suddenly.
REFERENCES:
patent: 4378776 (1983-04-01), Nishimori
patent: 4378777 (1983-04-01), Iida et al.
patent: 4448177 (1984-05-01), Hasegawa et al.
patent: 4448178 (1984-05-01), Yamato et al.
patent: 4466416 (1984-08-01), Kawamura
Murakami Nobuaki
Oomori Shogo
Adams Bruce L.
Burns Robert E.
Lall Parshotam S.
Lobato Emmanuel J.
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
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