Patent EP0075266A2 successfully refreshed from Google Patents.
EP0075266A2
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EP
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Exhaust gas recirculation (EGR) system with a vacuum regulator in an automotive vehicle
Assignee: Robertshaw US Holding Corp
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Filing: 1982-09-15
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Granted: —
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Expires: 2002-09-15
Abstract
Abstract An automotive vehicle having a diesel engine, a throttle system actuable to control the engine speed, a vacuum pump driven by the engine and forming, at least in part, a vacuum pressure source, and an exhaust gas recirculation (EGR) system. The EGR system comprises an EGR valve and a valve controller or vacuum regulator for governing the level of vacuum pressure communicated to the EGR valve from the vacuum pressure source. The valve controller has a housing (1, 60) defining an output port for supplying operating pressure to the EGR valve, an input port communicating with the vacuum pressure source, and an input port communicating with ambient atmospheric pressure. Regulator valving means in the housing (1, 60) includes a control members (5, 100) movable to control communication between the output port and the input ports to govern the valve operating vacuum pressure level. Throttle position responsive means exerts actuating force on the control member (5, 100) to alter the output pressure. The throttle position responsive means comprises a lever (11', 130) connected to the throttle system, a cam (12', 132) supported by the housing (1, 60) and driven by the lever (11', 130) and a resiliently deflectable force transmitting element (10', 134) between the cam (12', 132) and the control member (5, 100) for applying force to the control member (5, 100) depending on the position of the lever (11', 130). An additional preferably adjustable pressure cam (15) is provided on the cam (12') for providing a simply constructed vacuum regulator which permits a control of the vacuum in such a manner that this abruptly goes over to atmospheric pressure upon a certain position of the lever (11', 130).
Inventors
- 👤 Günter Dipl.-Ing. Piesche
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 07:23
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/04; G05D16/06; G05D16/063; G05D16/0644; G05D16/0655; G05D16/0661; F; F02; F02D; F02D21/00; F02D21/06; F02D21/08; F02M; F02M26/00; F02M26/52; F02M26/55; F02M26/56; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
356 words
Exhaust gas recirculation (EGR) system in an automotive vehicle having a diesel engine (12), a throttle system (16) actuable to control the engine speed, a vaccum pump (20) driven by the engine and forming, at least in part, a vacuum pressure source (20, 22), the EGR system (30) having an EGR valve assembly (32) operable to recirculate exhaust gas to the engine air intake in relation to the degree of valve operating vacuum pressure communicated thereto and, a vacuum regulator or valve controller (34) for governing the level of vacuum pressure source, characterized by said valve controller (34) comprising: a) a housing (1, 60) difining an output port communicating with the EGR valve (32) for supplying operating pressure thereto, an input port communicating with the vaccum pressure source (20, 22), and an input port communicating with ambient atmospheric pressure; b) a regulator valving means in said housing (1, 60) including a control member (5, 100) movable to control communication between said output port and said input ports to govern the valve operating vacuum pressure level, said control member (5, 100) acted upon by differential pressure force between the output pressure and the pressure at one of said input ports; and c) throttle position responsive means for exerting actuating force on said control member (5, 100) which varies as a predetermined function of throttle system operation to alter the output pressure, said throttle position responsive means comprising: i) a lever (11', 130) connected to said throttle system (16); ii) a cam (12', 132) supported by said housing (1, 60) and driven by said lever (11', 130); and iii) a resiliently deflectable force transmitting element (10, 134) between said cam (12', 132) and said control member (5, 100) for applying force to said control member (5, 100) depending on the position of said lever (11', 130), said force transmitting element effective to change the force applied to said control member in response to change in the cam position with said control member moving in response thereto to establish a changed output pressure to said EGR valve (32) at which the forces acting on said control member are balanced.
Claim 2
Dependent Claim
356 words
Exhaust gas recirculation (EGR) system in an automotive vehicle having a diesel engine (12), a throttle system (16) actuable to control the engine speed, a vaccum pump (20) driven by the engine and forming, at least in part, a vacuum pressure source (20, 22), the EGR system (30) having an EGR valve assembly (32) operable to recirculate exhaust gas to the engine air intake in relation to the degree of valve operating vacuum pressure communicated thereto and, a vacuum regulator or valve controller (34) for governing the level of vacuum pressure source, characterized by said valve controller (34) comprising: a) a housing (1, 60) difining an output port communicating with the EGR valve (32) for supplying operating pressure thereto, an input port communicating with the vaccum pressure source (20, 22), and an input port communicating with ambient atmospheric pressure; b) a regulator valving means in said housing (1, 60) including a control member (5, 100) movable to control communication between said output port and said input ports to govern the valve operating vacuum pressure level, said control member (5, 100) acted upon by differential pressure force between the output pressure and the pressure at one of said input ports; and c) throttle position responsive means for exerting actuating force on said control member (5, 100) which varies as a predetermined function of throttle system operation to alter the output pressure, said throttle position responsive means comprising: i) a lever (11', 130) connected to said throttle system (16); ii) a cam (12', 132) supported by said housing (1, 60) and driven by said lever (11', 130); and iii) a resiliently deflectable force transmitting element (10, 134) between said cam (12', 132) and said control member (5, 100) for applying force to said control member (5, 100) depending on the position of said lever (11', 130), said force transmitting element effective to change the force applied to said control member in response to change in the cam position with said control member moving in response thereto to establish a changed output pressure to said EGR valve (32) at which the forces acting on said control member are balanced.
Claim 3
Dependent Claim
34 words
EGR system as claimed in claim 1, characterized in that said controller (34) comprises a housing (60) defining a lever supporting bearing porting (140) ,said cam supported by said bearing portion within said housing.
Claim 4
Dependent Claim
50 words
EGR system as claimed in claims 1 or 2, characterized in that said force transmitting element (10, 134) comprises a resilient spring element extending between said cam (12', 132) and said regulator member (5, 100) and further including an adjustably movable calibration element (18, 156) engageable with said spring element.
Claim 5
Dependent Claim
48 words
EGR system as claimed in claim 3, characterized in that said spring element (10, 134) is a leaf spring having a midsection (16', 150) engaging said regulator member (5, 100) and oppositely extending end portions resiliently engaging said cam (12), 132) and said calibration element (18', 156), respectively.
Claim 6
Dependent Claim
26 words
EGR system as claimed in claim 4, characterized by a spring member (8, 104) biasing said regulator member (5, 100) against said spring element (10', 134).
Claim 7
Dependent Claim
76 words
EGR system as claimed in claim 5, characterized in that said cam (12', 132) includes a lobe portion (132a) effective to engage said spring element (12', 132) and produce a force on said regulator member (5, 100) which exceeds the force of said spring member (8, 104) for preventing said valve controller (34) from opening said EGR valve (32) when said lever (11', 130) is in a position for maximizing the fuel supplied to the engine.
Claim 8
Dependent Claim
186 words
Vacuum regulator, especially for use in exhaust gas recirculating (EGR) systems as claimed in any one of claims 1 to 6 of motor vehicles with internal combustion engine and with a constant source of vacuum, comprising a vacuum chamber (2) and an atmospheric pressure chamber (3), between which a diaphragm (4) is disposed having an auxiliary sealing disc (5) movable in relation thereto, said diaphragm (4) selectively closing both the vacuum input port (7) and a through port (6) in said auxiliary sealing disc (5), and said auxiliary sealing disc (5) being pressed resiliently towards said diaphragm (4) and acted upon controllably in the other direction by a counter-force, characterized in that for applying said controllable counter-force, a leaf spring (10') which is fastened to the housing (1) of said vacuum regulator and is in connection with said auxiliary sealing disc (5) is provided, a pressure cam disc (12') being connected for fixed rotation with a control lever (11') for acting upon said leaf spring, and that an additional pressure cam (14', 15') is provided on said pressure cam disc (12') outside the cam curve (13').
Claim 9
Dependent Claim
26 words
Vacuum regulator according to claim 7, characterized in that said additional pressure cam (15') is adjustable in its point of action with said leaf spring (10').
Claim 10
Dependent Claim
21 words
Vacuum regulator according to claims 7 or 8, characterized in that said additional pressure cam is constructed as adjustment screw (15').
Claim 11
Dependent Claim
40 words
Vacuum regulator according to claims 7, 8 or 9, characterized in that the leaf spring (10') is constructed as two-armed spring with two fastening members (17') provided along the one spring arm (16'), which are integral with the leaf spring.
Claim 12
Dependent Claim
43 words
Vacuum regulator according to any one of the claims 7 to 10, characterized in that at the end of the leaf sprin (10') opposing the point of action of the pressure cam disc (12'), means (18') is provided for adjusting the spring bias.
Claim 13
Dependent Claim
21 words
Vacuum regulator according to claim 11, characterized in that the means for adjusting the spring bias is an adjustment screw (18').
Claim 14
Dependent Claim
46 words
Vacuum regulator according to any one of claims 7 to 12, characterized in that a helical pressure spring (8) concentric to the vacuum input port (7) and through port (6) in the auxiliary sealing disc (5) presses said auxiliary sealing disc (5) towards said diaphragm (4).
References Cited (Backward Citations)
No citation records indexed.
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