F - Mech Eng,Light,Heat,Weapons – 02 – M
Patent
F - Mech Eng,Light,Heat,Weapons
02
M
123/98.05
F02M 25/06 (2006.01) F02M 25/07 (2006.01)
Patent
CA 1073767
ABSTRACT OF THE DISCLOSURE Two diaphragms divide a vacuum motor which controls the flow of exhaust gases from the exhaust passage to the induction system into three chambers, the first is fed a modulated vacuum signal from the induction passage, the second either an uncontrolled signal from substan- tially the aforementioned part of the induction passage or a VC vacuum created immediately upstream of the position assumed by the throttle valve in a fully closed position and the third exposed to atmospheric pressure. A relief valve disposed in the conduit through which the modulated vacuum is fed opens upon the pressure therein falling to a predetermined level to further modulate the vacuum in the first chamber. The vacuum regulating device which modulates the vacuum from the induction passage is responsive to atmos- pheric pressure, a signal which originates immediately downstream of a restriction in the EGR passage which may be either greater or less than atmospheric pressure depending on the design of the restriction and a venturi vacuum signal or the equivalent. To modulate the vacuum in the first chamber the relief valve can feed the vacuum which opens it to a normally atmospheric chamber of the vacuum regulating device. - 1 -
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