Closed loop exhaust gas recirculation system

Details Closed loop exhaust gas recirculation system Closed loop exhaust gas recirculation system

F - Mech Eng,Light,Heat,Weapons

02

M

341/38.123

F02M 25/06 (2006.01) F02D 21/08 (2006.01) F02D 41/00 (2006.01) F02D 41/24 (2006.01) F02M 25/07 (2006.01)

Patent

CA 1109947

CLOSED LOOP EXHAUST GAS RECIRCULATION SYSTEM ABSTRACT OF THE DISCLOSURE 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 (MAP0) 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), areaccurately 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 MAP0. 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 < MAP0 and the amount of EGR is decreased if MAP > MAP0.

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