EP0051452A1 - Système de contrôle à dépression - Google Patents

Système de contrôle à dépression Download PDF

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Publication number
EP0051452A1
EP0051452A1 EP81305124A EP81305124A EP0051452A1 EP 0051452 A1 EP0051452 A1 EP 0051452A1 EP 81305124 A EP81305124 A EP 81305124A EP 81305124 A EP81305124 A EP 81305124A EP 0051452 A1 EP0051452 A1 EP 0051452A1
Authority
EP
European Patent Office
Prior art keywords
vacuum
chamber
valve
outlet
check valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP81305124A
Other languages
German (de)
English (en)
Inventor
William Tracy Cameron, Jr.
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ford Werke GmbH
Ford France SA
Ford Motor Co Ltd
Original Assignee
Ford Werke GmbH
Ford France SA
Ford Motor Co Ltd
Ford Motor Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ford Werke GmbH, Ford France SA, Ford Motor Co Ltd, Ford Motor Co filed Critical Ford Werke GmbH
Publication of EP0051452A1 publication Critical patent/EP0051452A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/22—Control of additional air supply only, e.g. using by-passes or variable air pump drives

Definitions

  • This invention relates to vacuum control systems.
  • air is introduced into the exhaust system to effect combustion of unburned hydrocarbons and to effect catalytic convertion of the exhaust gases.
  • By-pass valves are provided to prevent overheating of the exhaust system which would otherwise occur during periods of sustained idling or deceleration.
  • a vacuum control is usually incorporated in such systems so that the by-pass valve is actuated only after a predetermined period following commencement of the idling or deceleration.
  • control systems comprise an assembly of parts which are expensive to produce and difficult to assemble.
  • a control system for a vacuum-operated valve comprising a vacuum line adapted at one end for connection to a vacuum source and at the other end for connection to the vacuum operated valve, the said valve being movable between open and closed positions in response to changes in pressure levels in the vacuum line, a check valve in the vacuum line for permitting flow of fluid in one direction along the vacuum line towards the vacuum source, characterised by a bleed passage effecring communication between a fluid pressure source and the vacuum line between the check valve and the said other end of the vacuum line.
  • a thermactor delay control has a housing defining a chamber with a check valve normally biased to a closed position operably positioned between the chamber and a ported vacuum source such that when the vacuum source applies a low pressure to the check valve, the check valve opens.
  • the housing chamber also has a restricted orifice which is in fluid communication to the exterior of the chamber.
  • the chamber also has an inlet which communicates with a vacuum reservoir which in turns communicates with a vacuum control portion of a bypass valve.
  • the restricted orifice is preferably formed from a sintered metal plug.
  • the sintered metal plug allows continuous bleeding of air into the chamber. The bleeding of air is sufficiently slow to normally allow the vacuum source to create sufficiently low pressure in the chamber and vacuum reservoir to control the bypass valve and maintain it in a normally closed position such that air flow is directed through the bypass valve into the thermactor system.
  • the check valve closes and the continuous bleeding of air slowly fills the chamber and vacuum reservoir.
  • the vacuum control portion maintains the vacuum bypass valve in its closed position for a predetermined amount of time until sufficient amount of air bleeds through the sintered metal plug such that the pressure is sufficiently increased so that the bypass valve is biased to its open position to divert air from entering the exhaust system.
  • the delay control has a calibrated orifice for allowing a continuous bleeding of air into the line which is operably connected to the vacuum control of a bypass valve.
  • FIG. 1 and 2 a typical vacuum control system is illustrated.
  • This system controls a bypass valve 58 by sensing the ported vacuum in a carburetor 10 above the throttle.
  • the carburetor 10 has a ported vacuum outlet 12 connected to a temperature vacuum switch 14.
  • a tube 16 connects the switch 14 to a T junction 18.
  • Tube 20 extends from T junction 18 to a check valve 22.
  • Tube 24 is connected to control inlet 26 of a vacuum vent valve 28.
  • Vacuum vent valve 28 includes a diaphragm 30 which is responsive to the vacuum in inlet 26 such that a predetermined low pressure therein moves diaphragm 30 to the left in Figure 1.
  • the diaphragm 30 is integral with a valve member 32 which closes vacuum vent-valve 28.
  • the diaphragm 30 moves valve member 32 to the right to open the valve 28 to let air flow through a restricting orifice 34 in outlet 36.
  • Check valve 22 has an outlet connected to a tube 38.
  • the outlet 36 is connected to tube 40.
  • Tubes 38 and 40 are connected to a T junction 42 which also is connected to tube 44 leading to a retard delay valve 46 which includes a check valve 48 and a restricted orifice 50 formed by a sintered metal plug.
  • the retard delay valve 46 is also in communication with a vacuum reservoir 54 which leads to the vacuum control 56 of bypass valve 58.
  • the bypass valve 58 is constructed such that when a low pressure below a predetermined value is applied to the vacuum control 56, the bypass valve 58 is actuated to a position that allows air to pass from inlet 57 connected to a thermactor pump (not shown) to outlet 59 connected to the exhaust manifold (not shown) and seals off vent port 61 (hereinafter referred to as the . bypass valve's closed position).
  • the bypass valve 58 is biased to move to a position that allows air to pass from inlet 57 to vent port 61 and to close off outlet 59 (hereinafter referred to as the bypass valve's open position).
  • a thermactor delay control 60 is operably connected to a ported vacuum source 12, a vacuum reservoir 54, and control portion 56 of a thermactor bypass valve 58.
  • the thermactor delay control 60 includes a generally cylindrically shaped housing 62 with an outlet 64 at one end and an inlet 66 at an opposing end thereof.
  • a dividing wall 70 partitions off a chamber 72 within housing 62.
  • a check valve 68 is mounted in the dividing wall 70 in communication with outlet 64 and chamber 72.
  • the outlet 64 is operably connected to the ported vacuum source 12.
  • the check valve 68 is normally biased to a closed position and is mounted such that when a low pressure is applied to outlet 64 the check valve 68 opens.
  • the scintered metal plug 76 includes a multitude of metallic fibers secured together to provide flow spaces therebetween. It is sealingly fitted in the orifice 75 to restrict and calibrate the amount of flow of air flowing therethrough and into the chamber 72.
  • a projecting section 78 of housing 62 is capped with an air filter 80 which covers the scintered metal plug 76 to protect it from particulates that can clog the plug 76.
  • the inlet 66 is in fluid communication. with the vacuum reservoir 54 which in turn is connected to the control section 56 of bypass valve 58.
  • FIG. 4 shows more clearly, in schematic form, the functional structure of the control 60.
  • the outlet line 64 is in communication with check valve 68 biased to a closed position and operable upon a vacuum in outlet line 64.
  • Orifice 75 is upstream from check valve 68 and has one end in fluid communication with inlet line 66 and check valve 68. The other end of orifice is unchecked and provides continuous bleeding into the vacuum lines.
  • a low pressure is normally applied to outlet 64 which opens check valve 68 and introduces a low pressure to chamber 72 and inlet 66.
  • the orifice 75 with the scintered metal plug 76 sufficiently restricts the flow into the chamber 72 such that the vacuum source 12 connected to outlet 64 easily overcomes the continuous bleeding through the orifice 74 to maintain the low pressure within the chamber 72, line 66, vacuum reservoir 54, and the control section 56 of the bypass valve 58.
  • the pressure applied to control section 56 sufficiently low to maintain the bypass valve in a normally closed position against its bias to open such that air passes from inlet 57 to outlet 59 and to the exhaust manifold (not shown).
  • the check valve 68 When the carburetor 10 is put in the idle mode or deceleration mode, and the ported vacuum source 12 no longer provides a sufficiently low pressure, the check valve 68 is biased to its closed position to prevent backup of vapors through the thermactor delay control 60, and to close off vacuum reservoir 54. Air slowly bleeds through orifice 75 which allows continuous bleeding of air therethrough into the chamber 72 and through the inlet 66 to the vacuum reservoir 54. The calibrated bleeding of air is sufficiently slow to maintain a low pressure within reservoir 54 for controlling the bypass valve 58 for a predetermined amount of time after which the pressure is sufficiently increased to allow the bypass valve to bias to its open position. Air which passes through inlet 57 is then dumped through vent port 61.
  • the scintered metal plug 76 is formed to allow for an approximately 50 second delay after an idle or deceleration modes commences after which the bypass valve 58 is then opened.
  • the bypass valve 58 remains. closed during the span and the thermactor system remains actuated with air being pumped into the exhaust manifold.
  • the thermactor delay control 60 includes a substantially cylindrical housing 80 with an annular end plate 82 having a central outlet 84 extending therefrom.
  • An annular end plate 86 is spaced from the end plate 82 with an inlet tube 88 extending therefrom.
  • a scintered metal plug 96 is mounted within an aperture 98 in the annular plate 86.
  • a dividing plate 90 is positioned within housing 80 between the two end plates 82 and 86.
  • the dividing plate,90 has a check valve 92 mounted therethrough which is normally biased to a closed position and openable upon a vacuum present in inlet 84.
  • the dividing plate 90, end plate 86, and housing sidewall 80 define a chamber 94 in communication with the inlet 88.
  • the sidewall 81 of housing 88 extends axially beyond the end plate 86 to form a seat for an annular filter 98 which fits about the inlet 88 and covers the scintered metal plug 96.
  • An annular end cap 100 is fitted within the cylindrical sidewall 81 about inlet tube 88 to cover the filter 98.
  • the end cap 100 has radially extending slots 102 which allow air to pass therethrough and through the filter 98 and the sintered metal plug, 96.
  • the inlet tube 88 is fluidly connected to the vacuum reservoir 54 and outlet 84 is similarly connected to the ported vacuum source 12.
  • the function of the second embodiment is identical to the first embodiment in that when a low pressure is applied to outlet 84, the check valve is opened and the vacuum source evacuates the chamber 94 and vacuum reservoir 54 and control section 56 to control bypass valve 58.
  • the scintered metal plug 96 allows a calibrated continuous bleed that is sufficiently slow for the vacuum source to easily overcome.
  • the check valve 92 closes to close off chamber 94. Continuous bleeding of air through the scintered metal plug 96 into chamber 94 and through outlet 88 into vacuum reservoir 54 slowly builds up the pressure therein such that upon a predeteremined amount of time, the bypass valve 58 opens thereby dumping the thermactor air into vent port 61.
  • the simple one-piece control valve 60 replaces a myriad of parts; namely, T junctions 18 and 42, lines 24, 20, 38, 40 and 44, vented value 28, check valve 22, and retard valve 46 shown in Figure 1. In total, the one control 60 replaces ten separate parts and eliminates the cost of assembling these ten parts.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Self-Closing Valves And Venting Or Aerating Valves (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
EP81305124A 1980-10-30 1981-10-29 Système de contrôle à dépression Withdrawn EP0051452A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US20222480A 1980-10-30 1980-10-30
US202224 1980-10-30

Publications (1)

Publication Number Publication Date
EP0051452A1 true EP0051452A1 (fr) 1982-05-12

Family

ID=22748972

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81305124A Withdrawn EP0051452A1 (fr) 1980-10-30 1981-10-29 Système de contrôle à dépression

Country Status (3)

Country Link
EP (1) EP0051452A1 (fr)
JP (1) JPS57108407A (fr)
CA (1) CA1180284A (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3992878A (en) * 1975-10-03 1976-11-23 Ford Motor Company Engine secondary air flow control system
US4033125A (en) * 1974-11-26 1977-07-05 Aisin Seiki Kabushiki Kaisha Air flow control means for automobile engine exhaust gas cleaning means
US4050249A (en) * 1976-04-30 1977-09-27 General Motors Corporation Control unit
US4174610A (en) * 1978-05-01 1979-11-20 General Motors Corporation Power cruise diverter valve

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4033125A (en) * 1974-11-26 1977-07-05 Aisin Seiki Kabushiki Kaisha Air flow control means for automobile engine exhaust gas cleaning means
US3992878A (en) * 1975-10-03 1976-11-23 Ford Motor Company Engine secondary air flow control system
US4050249A (en) * 1976-04-30 1977-09-27 General Motors Corporation Control unit
US4174610A (en) * 1978-05-01 1979-11-20 General Motors Corporation Power cruise diverter valve

Also Published As

Publication number Publication date
JPS57108407A (en) 1982-07-06
CA1180284A (fr) 1985-01-02

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: FORD-WERKE AKTIENGESELLSCHAFT

Owner name: FORD FRANCE SOCIETE ANONYME

Owner name: FORD MOTOR COMPANY LIMITED

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19830414

RIN1 Information on inventor provided before grant (corrected)

Inventor name: CAMERON, WILLIAM TRACY, JR.