Closed loop programmable EGR with coolant temperature sensitivit

Details Closed loop programmable EGR with coolant temperature sensitivit Closed loop programmable EGR with coolant temperature sensitivit

1978-01-19

1979-08-14

Burns, Wendell E.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

F02M 2506

Patent

active

041642066

ABSTRACT:
A closed loop programmable EGR control system is disclosed. The EGR control system comprises a first read only memory having a look up table of base EGR pulse widths as a function of engine speed and absolute manifold pressure. This base EGR pulse width is corrected to a total desired pulse width by adding a correction pulse width obtained from a second read only memory. The second ROM stores values of the correction pulse width in a look up table as a function of engine speed and engine coolant temperature. This desired value of EGR pulse width is then compared to the actual EGR flow as sensed directly by a differential pressure transducer located in the exhaust gas recirculation conduit and an error signal is generated therefrom. The error signal is subsequently used to operate a solenoid pilot valve that alternately applies either a vacuum or atmospheric vent at a controllable rate to an EGR valve regulating the amount of exhaust gas recirculated to thereby reduce the error between the actual and desired EGR values.

REFERENCES:
patent: 3799133 (1974-03-01), Frank
patent: 3872846 (1975-03-01), Taplin et al.
patent: 3915134 (1975-10-01), Young et al.
patent: 3963011 (1976-06-01), Saito et al.
patent: 3969614 (1976-07-01), Moyer et al.
patent: 3982395 (1976-09-01), Hasegawa et al.
patent: 4024847 (1977-05-01), Koganemaru
patent: 4044738 (1977-08-01), Williams et al.
patent: 4052968 (1977-10-01), Hattori et al.
patent: 4071003 (1978-01-01), Aono

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