Deceleration control apparatus for vehicle engine

Deceleration control apparatus for a vehicle engine having a throttle valve mounted in an intake passage, the improvement comprising, in combination:

• a dash pot mechanism having a diaphragm operatively connected to said throttle valve, a vacuum chamber having a wall thereof formed by said diaphragm, a first vacuum outlet positioned slightly upstream of the adjacent portion of the throttle valve at its minimum opening position, a first vacuum passage connected between said vacuum chamber and said vacuum outlet, a first check valve positioned in said first vacuum passage and opening upon increased vacuum intensity at said first vacuum outlet, a restricted passage connecting said vacuum chamber to atmosphere, a second vacuum outlet positioned downstream from said throttle valve, a second vacuum passage connecting said vacuum chamber to said second vacuum outlet, and a check valve positioned in said second vacuum passage, whereby the vacuum from said first vacuum passage to said vacuum chamber activates said dash pot mechanism, and whereby the vacuum from said second vacuum passage to said vacuum chamber causes said diaphragm to act as a throttle opener, an air passage communicating with said intake passage downstream from the throttle valve, a control valve operatively interposed in said air passage and having a movable valve element, pressure responsive means including a movable member for moving said valve element between open and closed position, said pressure responsive means including a vacuum chamber on one side of said movable member subjected to pressure in said air passage, means providing a closed chamber on the other side of said movable member, and valve means on the movable member acting to restrict flow from the closed chamber to the vacuum chamber while permitting relatively unrestricted flow in the opposite direction, whereby the control valve is opened quickly upon increase in vacuum intensity in said air passage to permit flow of atmospheric air into the engine intake passage, said control valve closing relatively slowly upon reduction of vacuum intensity in said air passage.

Deceleration control apparatus for vehicle engine having a throttle valve mounted in an intake passage, the improvement comprising, in combination:

• a dash pot mechanism having a diaphragm operatively connected to said throttle valve and a vacuum chamber, a first vacuum passage connected between said vacuum chamber and a first vacuum outlet positioned slightly upstream of the adjacent portion of the throttle valve at its minimum opening position, a first check valve positioned in said first vacuum passage, a restricted passage connecting said vacuum chamber to atmosphere, a second vacuum passage connected between said vacuum chamber and second vacuum outlet positioned downstream side of the throttle valve, a check valve positioned in said second vacuum passage, an air passage communicating with said intake passage downstream from the throttle valve, a control valve operatively interposed in said air passage and having a movable valve element, pressure responsive means including a movable member for moving said valve element between open and closed position, said pressure responsive means including a vacuum chamber on one side of said movable member subjected to pressure in said air passage, means providing a closed chamber on the other side of said movable member, and valve means on the movable member acting to restrict flow from the closed chamber to the vacuum chamber while permitting relatively unrestricted flow in the opposite direction, whereby the control valve is opened quickly upon increase in vacuum intensity in said air passage to permit flow of atmospheric air into the engine intake passage, said control valve closing relatively slowly upon reduction of vacuum intensity in said air passage.

Deceleration control apparatus for a vehicle engine having a throttle valve mounted in an intake passage, the improvement comprising, in combination:

• a dash pot mechanism having a diaphragm operatively connected to said throttle valve, a vacuum chamber having a wall thereof formed by said diaphragm, a first vacuum outlet positioned slightly upstream of the adjacent portion of the throttle valve at its minimum opening position, a first vacuum passage connected between said vacuum chamber and said vacuum outlet, a first check valve positioned in said vacuum passage and opening upon increased vacuum intensity at said first vacuum outlet, a restricted passage connecting said vacuum chamber to atmosphere, a second vacuum outlet positioned downstream from said throttle valve, a second vacuum passage connecting said vacuum chamber to said second vacuum outlet, an air passage communicating with said intake passage downstream from the throttle valve, a control valve operatively interposed in said air passage and having a movable valve element, pressure responsive means including a movable member for moving said valve element between open and closed position, said pressure responsive means including a vacuum chamber on one side of said movable member subjected to pressure in said air passage, means providing a closed chamber on the other side of said movable member, and valve means on the movable member acting to restrict flow from the closed chamber to the vacuum chamber while permitting relatively unrestricted flow in the opposite direction, whereby said control valve is opened quickly upon increase in vacuum intensity in said air passage to permit flow of atmospheric air into the engine intake passage, said control valve closing relatively slowly upon reduction of vacuum intensity in said air passage.