US3795237A — Carburetor anti-dieseling and deceleration control

Claim 1

Independent Claim 383 words

An engine anti-dieseling control comprising, in combination, an engine carburetor having an induction passage open to atmospheric pressure at one end and adapted to be connected to an engine intake manifold at the opposite end so as to be subject to engine vacuum varying in level from ambient atmospheric pressure at engine shutdown to a maximum subatmospheric pressure level during engine deceleration operating conditions, a throttle valve rotatably mounted across the passage for controlling flow through the passage, an idle fuel/air mixture channel connected to the induction passage below the throttle valve so that the idle channel is subjected to manifold vacuum at all times to provide normal idle and beyond normal idle speed mixture flow, and control means responsive to engine shutdown conditions for admitting air into a portion of the idle mixture channel to decay the vacuum signal upstream thereof to a level essentially terminating idle channel fuel flow while maintaining an air flow to the engine, to thereby prevent engine dieseling, the idle channel having an air line connected to the idle channel at one end and to a source of air at essentially atmospheric pressure at the other end, valve means in the air line movable between positions opening and closing the air line, and vacuum controlled servo means connected to the valve means for temporarily moving the valve means to an open position in response to decay of manifold vacuum upon engine shutdown to decay the idle channel vacuum and subsequently moving the valve means to a closed position to condition the carburetor idle channel for an engine start condition, the servo means including a movable diaphragm connected to the valve means and dividing the servo means into two channels, spring means biasing the diaphragm towards a valve means closed position, conduit means connecting the induction passage below the throttle valve to both chambers in parallel paths, a vacuum reservoir in one of the paths, and orifice means in the one path between the reservoir and induction passage to delay communication of change of pressure level in the passage to the reservoir whereby reservoir vacuum will open the air valve means upon engine shutdown decaying manifold vacuum in the other path, the subsequent decay of the reservoir vacuum permitting the spring means to bias the valve means closed.

Claim 2

Dependent Claim 383 words

An engine anti-dieseling control comprising, in combination, an engine carburetor having an induction passage open to atmospheric pressure at one end and adapted to be connected to an engine intake manifold at the opposite end so as to be subject to engine vacuum varying in level from ambient atmospheric pressure at engine shutdown to a maximum subatmospheric pressure level during engine deceleration operating conditions, a throttle valve rotatably mounted across the passage for controlling flow through the passage, an idle fuel/air mixture channel connected to the induction passage below the throttle valve so that the idle channel is subjected to manifold vacuum at all times to provide normal idle and beyond normal idle speed mixture flow, and control means responsive to engine shutdown conditions for admitting air into a portion of the idle mixture channel to decay the vacuum signal upstream thereof to a level essentially terminating idle channel fuel flow while maintaining an air flow to the engine, to thereby prevent engine dieseling, the idle channel having an air line connected to the idle channel at one end and to a source of air at essentially atmospheric pressure at the other end, valve means in the air line movable between positions opening and closing the air line, and vacuum controlled servo means connected to the valve means for temporarily moving the valve means to an open position in response to decay of manifold vacuum upon engine shutdown to decay the idle channel vacuum and subsequently moving the valve means to a closed position to condition the carburetor idle channel for an engine start condition, the servo means including a movable diaphragm connected to the valve means and dividing the servo means into two channels, spring means biasing the diaphragm towards a valve means closed position, conduit means connecting the induction passage below the throttle valve to both chambers in parallel paths, a vacuum reservoir in one of the paths, and orifice means in the one path between the reservoir and induction passage to delay communication of change of pressure level in the passage to the reservoir whereby reservoir vacuum will open the air valve means upon engine shutdown decaying manifold vacuum in the other path, the subsequent decay of the reservoir vacuum permitting the spring means to bias the valve means closed.

Claim 3

Dependent Claim 67 words

A control as in claim 1, and second control means responsive to high manifold vacuum forces above a predetermined level that is indicative of engine decelerating conditions for admitting air into the idle mixture channel to decay the vacuum therein, the second control means including a second manifold vacuum actuated servo moved by vacuum for controlling the application of manifold vacuum to the first mentioned servo means.

Claim 4

Dependent Claim 90 words

A control as in claim 2, including a second line connecting manifold vacuum to the first and second servos to act thereon, the second line containing an air port controlled by a second valve movably connected to the second servo means and operable upon the attainment of a high vacuum force indicative of engine decelerating conditions to move the second valve open to decay vacuum in the second line to the first servo whereby the first servo moves the first valve to open to flow air into the idle channel.

Claim 5

Dependent Claim 382 words

An engine anti-dieseling and deceleration control comprising, in combination, an engine carburetor having an air/fuel induction passage, an air cleaner assembly discharging clean air at essentially atmospheric pressure into one end of the passage, the other end of the passage being connected to the intake manifold of the engine so as to subject the passage to changes in manifold vacuum, a throttle valve rotatably mounted for movement across tHe passage, an idle air/fuel mixture channel connected to the induction passage at a point below the throttle valve so as to be subject to the manifold vacuum at all times to provide an idle speed and off idle speed air/fuel mixture flow, and control means to regulate the flow of fuel through the idle channel during engine decelerating conditions and at engine shutdown to minimize the emission of undesirable elements into the atmosphere, the control means including a first air port operably connected to the idle mixture channel, first conduit means connecting the port of the air cleaner for the decay at times of a portion of the channel vacuum by passage of air from the air cleaner to the port, a first manifold vacuum sensitive valve movably associated with the port for opening and closing the same, spring means biasing the valve in a closed direction, second conduit means operably connecting manifold vacuum to the first valve for moving the same in the opposite direction, a second air port in the second conduit means connected to the air cleaner for at times decaying the vacuum in the second conduit means, a second manifold vacuum sensitive valve associated with the second port for controlling opening and closing of the same, second spring means biasing the second valve closed, and a vacuum reservoir operably connected to the first valve for at times moving the first valve against the spring bias, an increase in manifold vacuum above a predetermined force indicative of engine decelerating conditions moving the first and second valves by vacuum to open both air ports and decay the idle channel vacuum and flow air to the engine, the decay of vacuum upon engine shutdown effecting decay of the idle channel vacuum by movement of the first valve by the reservoir vacuum to open the first air port, to thereby prevent engine dieseling.

Claim 6

Dependent Claim 382 words

An engine anti-dieseling and deceleration control comprising, in combination, an engine carburetor having an air/fuel induction passage, an air cleaner assembly discharging clean air at essentially atmospheric pressure into one end of the passage, the other end of the passage being connected to the intake manifold of the engine so as to subject the passage to changes in manifold vacuum, a throttle valve rotatably mounted for movement across tHe passage, an idle air/fuel mixture channel connected to the induction passage at a point below the throttle valve so as to be subject to the manifold vacuum at all times to provide an idle speed and off idle speed air/fuel mixture flow, and control means to regulate the flow of fuel through the idle channel during engine decelerating conditions and at engine shutdown to minimize the emission of undesirable elements into the atmosphere, the control means including a first air port operably connected to the idle mixture channel, first conduit means connecting the port of the air cleaner for the decay at times of a portion of the channel vacuum by passage of air from the air cleaner to the port, a first manifold vacuum sensitive valve movably associated with the port for opening and closing the same, spring means biasing the valve in a closed direction, second conduit means operably connecting manifold vacuum to the first valve for moving the same in the opposite direction, a second air port in the second conduit means connected to the air cleaner for at times decaying the vacuum in the second conduit means, a second manifold vacuum sensitive valve associated with the second port for controlling opening and closing of the same, second spring means biasing the second valve closed, and a vacuum reservoir operably connected to the first valve for at times moving the first valve against the spring bias, an increase in manifold vacuum above a predetermined force indicative of engine decelerating conditions moving the first and second valves by vacuum to open both air ports and decay the idle channel vacuum and flow air to the engine, the decay of vacuum upon engine shutdown effecting decay of the idle channel vacuum by movement of the first valve by the reservoir vacuum to open the first air port, to thereby prevent engine dieseling.

Claim 7

Dependent Claim 38 words

A control as in claim 4, including a first vacuum-controlled servo connected to the first valve and having a first vacuum chamber connected to the second conduit means and a second vacuum chamber connected to the vacuum reservoir.

Claim 8

Dependent Claim 46 words

A control as in claim 4, including a vacuum sensitive servo connected to the second valve and movable by manifold vacuum acting thereagainst above the predetermined level to oppose the second spring means and open the second valve, to admit air to the second conduit means.

Claim 9

Dependent Claim 91 words

A control as in claim 4, including first and second vacuum controlled movable diaphragm type servos connected respectively to the first and second valves, the first servo having a first vacuum chamber connected to the second conduit means and a second vacuum chamber connected to the vacuum reservoir, movement of the second valve by vacuum above the predetermined level opening the second air port and decaying the vacuum in the second conduit means, permitting reservoir vacuum to open the first air port to decay the idle channel vacuum to reduce emissions.

Claim 10

Dependent Claim 47 words

A control as in claim 7, including third conduit means connecting the manifold vacuum to the reservoir, and an orifice in the third conduit means between the reservoir and manifold to delay change in pressure level of the reservoir upon change in pressure level of the manifold.

Claim 11

Dependent Claim 244 words

A carburetor having an induction passage exposed to engine manifold vacuum and an idle system fuel/air mixture channel connected thereto, a supplemental air bleed port in the idle system channel, a valve movable by vacuum to an open position to admit and by spring means to a closed position to block flow of air through the port into the channel, and means operable upon engine shutdown for initially effecting movement of the valve to open the port to decay the idle system vacuum to terminate idle system fuel flow and subsequently automatically after a timed delay effecting movement of the valve to close the port, the last mentioned means including a vacuum servo connected to the valve and having first and second conduit means conducting manifold vacuum from the induction pasSage to opposite sides respectively of the servo to obtain a force balanced condition, spring means aiding the fluid forces on one side and biasing the valve closed, the first conduit means including a vacuum accumulator reservoir and a flow restriction between the reservoir and the induction passage connected to manifold vacuum whereby engine shutdown decaying manifold vacuum to a pressure above the level of reservoir vacuum effects movement of the valve against the spring means to admit air into the port until subsequent decay of the reservoir vacuum again obtains a net force condition permitting spring movement of the valve to block the port and condition the idle system channel for normal operation.

Claim 12

Dependent Claim 244 words

A carburetor having an induction passage exposed to engine manifold vacuum and an idle system fuel/air mixture channel connected thereto, a supplemental air bleed port in the idle system channel, a valve movable by vacuum to an open position to admit and by spring means to a closed position to block flow of air through the port into the channel, and means operable upon engine shutdown for initially effecting movement of the valve to open the port to decay the idle system vacuum to terminate idle system fuel flow and subsequently automatically after a timed delay effecting movement of the valve to close the port, the last mentioned means including a vacuum servo connected to the valve and having first and second conduit means conducting manifold vacuum from the induction pasSage to opposite sides respectively of the servo to obtain a force balanced condition, spring means aiding the fluid forces on one side and biasing the valve closed, the first conduit means including a vacuum accumulator reservoir and a flow restriction between the reservoir and the induction passage connected to manifold vacuum whereby engine shutdown decaying manifold vacuum to a pressure above the level of reservoir vacuum effects movement of the valve against the spring means to admit air into the port until subsequent decay of the reservoir vacuum again obtains a net force condition permitting spring movement of the valve to block the port and condition the idle system channel for normal operation.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1977-03-04	1977-09-03	1978-03-05	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1981-03-04	1981-09-03	1982-03-05	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1985-03-04	1985-09-03	1986-03-05	$7700.00	Window Closed / Lapsed

Carburetor anti-dieseling and deceleration control

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