US3915136A — Control system for exhaust gas recirculating valve

Claim 1

Independent Claim 101 words

An exhaust gas recirculating system for an engine in which a fluid pressure operated exhaust gas recirculating valve has an open condition to enable engine exhaust gas to mix with engine intake gas and a closed condition, a fluid pressure regulator communicating valve operating pressure from a pressure source to the valve in relation to gas flow through the engine and valve controller means for effecting operation of the valve to the closed condition and preventing said regulator from communicating operation pressure to said valve in response to predetermined engine operating conditions irrespective of the gas flow rate through the engine.

Claim 2

Dependent Claim 101 words

An exhaust gas recirculating system for an engine in which a fluid pressure operated exhaust gas recirculating valve has an open condition to enable engine exhaust gas to mix with engine intake gas and a closed condition, a fluid pressure regulator communicating valve operating pressure from a pressure source to the valve in relation to gas flow through the engine and valve controller means for effecting operation of the valve to the closed condition and preventing said regulator from communicating operation pressure to said valve in response to predetermined engine operating conditions irrespective of the gas flow rate through the engine.

Claim 3

Dependent Claim 60 words

An exhaust gas recirculating system as claimed in claim 1 wherein said valve controller comprises a fluid signal producing means communicating with engine intake air to produce fluid signals which vary in magnitude in dependence on engine speed and load and a controller member movable in response to fluid signals of a predetermined level to effect closing of said valve.

Claim 4

Dependent Claim 100 words

A system as claimed in claim 2 further characterized in that said signal producing means comprises a port in an engine intake air duct, a pressure signal transmitting conduit extending from said port and a movable throttling member in said intake air duct, said throttling member having a given throttling position in which said port is communicated with air substantially at atmospheric pressure and movable from said throttling position to communicate said port with engine intake manifold pressure, said signal producing means effecting operation of said valve to the closed condition when said throttling member is in said throttling position.

Claim 5

Dependent Claim 29 words

A system as claimed in claim 1 wherein said valve controller comprises a movable member which is positioned to effect closing of said valve when the engine is idling.

Claim 6

Dependent Claim 35 words

A system as claimed in claim 1 wherein said valve controller comprises a movable member which is positioned to effect closing of said valve when the engine is operating under substantially wide open throttle conditions.

Claim 7

Dependent Claim 175 words

A system as claimed in claim 1 wherein said fluid pressure regulator comprises a regulator valve means including a valve body movable between a first position wherein valve operating pressure is communicated from said pressure source to said exhaust gas recirculating valve for opening said valve, a second position wherein communication from said pressure source to said valve is blocked and atmospheric air pressure is communicated to said exhaust gas recirculating valve for closing said valve and a third position wherein communication of atmospheric air pressure and valve operating pressure to said valve is blocked so that the condition of the valve is stabilized, actuator means for positioning said vAlve body in response to the flow rate of gas through the engine to change the condition of said valve in response to changes in the rate of gas flow through the engine, said controller means comprising a controller member operable to move said valve body to said second position when the engine idles and when the engine operates substantially at a wide open throttle condition.

Claim 8

Dependent Claim 33 words

A system as claimed in claim 6 wherein said controller means further comprises biasing means for urging said controller member towards a position in which said valve body is in said second position.

Claim 9

Dependent Claim 63 words

A system as claimed in claim 6 wherein said actuator means comprises an actuator member for engaging and moving said valve body, said controller member defining a surface portion engageable with said actuator member, and said controller means further comprising force applying means for urging said controller member into engagement with said actuator member for moving said valve body to said second position.

Claim 10

Dependent Claim 152 words

In an exhaust gas recirculation control system for an internal combustion engine having an air intake duct containing a movable throttle, a pressure operated exhaust gas recirculation control valve openable to permit recirculation of exhaust gas from an engine exhaust duct to an engine intake duct, pressure source means providing a source of operating pressure for the valve, a pressure regulator between said pressure source and said valve for governing communication of operating pressure between said valve and said pressure source, signal means providing an input signal to the regulator which varies in magnitude in relation to gas flow through the engine, said regulator controlling communication of operating pressure between said source means and said valve in response to said input signal, and valve controller means for blocking communication of operating pressure from said source means to said valve when the engine is operated at idle speed and at wide open throttle.

Claim 11

Dependent Claim 152 words

In an exhaust gas recirculation control system for an internal combustion engine having an air intake duct containing a movable throttle, a pressure operated exhaust gas recirculation control valve openable to permit recirculation of exhaust gas from an engine exhaust duct to an engine intake duct, pressure source means providing a source of operating pressure for the valve, a pressure regulator between said pressure source and said valve for governing communication of operating pressure between said valve and said pressure source, signal means providing an input signal to the regulator which varies in magnitude in relation to gas flow through the engine, said regulator controlling communication of operating pressure between said source means and said valve in response to said input signal, and valve controller means for blocking communication of operating pressure from said source means to said valve when the engine is operated at idle speed and at wide open throttle.

Claim 12

Dependent Claim 126 words

A system as claimed in claim 9 wherein said valve controller means comprises second signal means for producing a fluid pressure signal which varies in accordance with positioning of the throttle and engine loading, a pressure operated assembly in communication with said fluid signal and movable from a first position to a second position in response to increases in magnitude of the second signal beyond a predetermined level relative to atmospheric pressure, said assembly comprising a controller member movable between a position wherein communication between said pressure source means and said valve is blocked and said valve is communicated to pressure which is ineffective to open the valve and a second position wherein said valve and said pressure source means are in communication via said regulator.

Claim 13

Dependent Claim 93 words

A system as claimed in claim 10 wherein said pressure source means comprises an engine intake manifold, a pressure reservoir communicating with said intake manifold and said regulator, and a check valve between said reservoir and said intake manifold to enable said reservoir to be charged from said intake manifold and prevent the charge in said reservoir from being dissipated to said manifold, said controller member effective to communicate said valve to atmospheric pressure in said first position while blocking communication of said reservoir to atmospheric pressure whereby said reservoir is maintained charged.

Claim 14

Dependent Claim 174 words

In an exhaust gas recirculation system for an engine having an air induction system, an exhaust system, a pressure operated exhaust gas recirculation control valve for communicating said induction and exhaust systems, and means defining a source of valve operating pressure; a control unit for governing operation of said exhaust gas recirculation control valve comprising: a. a regulator valve means between said pressure source and said exhaust gas recirculation valve comprising a valve body movable to variably govern the communication of pressure from said source to said exhaust gas recirculatiOn control valve and thereby control the position of said control valve; b. pressure responsive actuator means for effecting movement of said valve body in relation to pressure signal levels which vary according to the flow rate of gas through the engine; and, c. controller means cooperatively related with said actuator means for effecting movement of said valve body to block communication of pressure from the source to the control valve when the engine idles and is operated substantially at a wide open throttle condition.

Claim 15

Dependent Claim 174 words

In an exhaust gas recirculation system for an engine having an air induction system, an exhaust system, a pressure operated exhaust gas recirculation control valve for communicating said induction and exhaust systems, and means defining a source of valve operating pressure; a control unit for governing operation of said exhaust gas recirculation control valve comprising: a. a regulator valve means between said pressure source and said exhaust gas recirculation valve comprising a valve body movable to variably govern the communication of pressure from said source to said exhaust gas recirculatiOn control valve and thereby control the position of said control valve; b. pressure responsive actuator means for effecting movement of said valve body in relation to pressure signal levels which vary according to the flow rate of gas through the engine; and, c. controller means cooperatively related with said actuator means for effecting movement of said valve body to block communication of pressure from the source to the control valve when the engine idles and is operated substantially at a wide open throttle condition.

Claim 16

Dependent Claim 145 words

The system claimed in claim 12 wherein said actuator means comprises a chamber communicable with a fluid signal pressure source means which varies according to changes in the flow rate of gas through the engine, and an actuator member supported for movement in response to changes in said fluid signal pressure to move said valve body, said controller means comprising a second chamber communicable with a second fluid signal pressure source means for producing fluid signals having less than a predetermined magnitude with respect to atmospheric pressure when the engine idles and is operated substantially at wide open throttle and a controller member supported for movement in response to establishment of fluid pressures in said second chamber less than said predetermined magnitude, said controller member biased to engage said actuator member and said valve body to block communication from said source to said control valve.

Claim 17

Dependent Claim 55 words

The system claimed in claim 13 wherein said controller member is biased to engage said actuator member by first spring means, and further including second spring means biasing said actuator member to resiliently oppose movement thereof in response to variations in pressure signal levels resulting from detected changes in gas flow rate through the engine.

Claim 18

Dependent Claim 24 words

The system claimed in claim 14 further including third spring means biasing said valve body in opposition to movement thereof by said actuator member.

Claim 19

Dependent Claim 86 words

The system claimed in claim 15 wherein said second and third spring means are cooperatively related with said actuator member and said valve body, respectively, in opposition to movement of said actuator member and said valve body by said controller member, said first spring means effective to overcome the biasing forces of said second and third spring means and effective movement of said valve body to said blocking position when said second fluid pressure signal source means produces a pressure signal less than said predetermined magnitude.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-10-27	1979-04-28	1979-10-28	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-10-27	1983-04-28	1983-10-28	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-10-27	1987-04-28	1987-10-28	$7700.00	Window Closed / Lapsed

Control system for exhaust gas recirculating valve

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