Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1977-11-28
1979-11-06
Burns, Wendell E.
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
F02M 2506
Patent
active
041732057
ABSTRACT:
A closed loop exhaust gas recirculation system for an internal combustion engine having an intake system, an exhaust manifold, a throttle disposed within the intake system for controlling air flow therein, a conduit coupling the exhaust manifold to the intake system for supplying exhaust gases back to the intake system for controlling the generation and emission of oxides of nitrogen and for improving driveability. The system includes a first memory pre-programmed with a look-up table of optimal values of absolute manifold pressure (MAP.sub.0) as a function of engine speed (RPM) and throttle position (.theta.). The actual operating parameters of absolute manifold pressure (MAP), engine speed (RPM) and throttle position (.theta.), or alternatively air flow (AF), are accurately sensed. The actual values of throttle position or air flow and RPM are used to address the first memory which outputs the pre-programmed optimal value of MAP. The actual value of throttle angle or air flow may be compensated for ambient barometric pressure and/or altitude, if desired. The actual value of MAP is compared with the optimal value of MAP.sub.0. The output of the comparator is used to close the loop and control the position of a valve positioned at least partially within the conduit such that the amount of recirculated exhaust gas (EGR) supplied to the input system is increased if MAP<MAP.sub.0 and the amount of EGR is decreased if MAP>MAP.sub.0.
REFERENCES:
patent: 3800764 (1974-04-01), Goto et al.
patent: 3915133 (1975-10-01), Nohira
patent: 3915134 (1975-10-01), Young
patent: 3963011 (1976-06-01), Saito
patent: 3982395 (1976-09-01), Hasegawa
patent: 4018198 (1977-04-01), Williams
patent: 4026256 (1977-05-01), Fenn
patent: 4060065 (1977-11-01), Hata et al.
patent: 4071003 (1978-01-01), Aono
Burns Wendell E.
Haas, Jr. Gaylord P.
The Bendix Corporation
Wells Russel C.
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