F - Mech Eng,Light,Heat,Weapons – 02 – M
Patent
F - Mech Eng,Light,Heat,Weapons
02
M
123/98.06
F02M 25/06 (2006.01) F02M 25/07 (2006.01)
Patent
CA 1223785
ABSTRACT OF THE DISCLOSURE This invention relates to electronically control- led exhaust gas recirculation valves and more particularly to systems incorporating an electrical vacuum regulator. The present invention provides an EGR system that is less susceptible to output flow changes caused by carbon build up. The invention also provides a vacuum regulator that can be used with simple, low cost EGR valves. Simple valves can be used by virture of the closed loop vacuum regulation feature of the present invention since the flow rate/vacuum signal relationship is not important. A further object of the present invention is to provide an EGR flow regulation system which automatically compensates for pressure varia- tions which result in changes in the pressure differential across the EGR valve due to changes in exhaust system pres- sure and intake manifold pressure.
434879
Canadian Fram Limited
Macrae & Co.
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