WO1999063256A1 - Valving device and drive unit - Google Patents

Valving device and drive unit Download PDF

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Publication number
WO1999063256A1
WO1999063256A1 PCT/JP1998/002395 JP9802395W WO9963256A1 WO 1999063256 A1 WO1999063256 A1 WO 1999063256A1 JP 9802395 W JP9802395 W JP 9802395W WO 9963256 A1 WO9963256 A1 WO 9963256A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
drive
rod
stepping motor
pulse
Prior art date
Application number
PCT/JP1998/002395
Other languages
French (fr)
Japanese (ja)
Inventor
Sotsuo Miyoshi
Hidetoshi Okada
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
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 Mitsubishi Denki Kabushiki Kaisha filed Critical Mitsubishi Denki Kabushiki Kaisha
Priority to PCT/JP1998/002395 priority Critical patent/WO1999063256A1/en
Publication of WO1999063256A1 publication Critical patent/WO1999063256A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
    • F02M26/54—Rotary actuators, e.g. step motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/66—Lift valves, e.g. poppet valves
    • F02M26/67—Pintles; Spindles; Springs; Bearings; Sealings; Connections to actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/66—Lift valves, e.g. poppet valves
    • F02M26/68—Closing members; Valve seats; Flow passages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/45—Sensors specially adapted for EGR systems
    • F02M26/48—EGR valve position sensors

Definitions

  • the present invention relates to a valve device and a drive device that can be used as an exhaust gas recirculation device used when returning exhaust gas to a combustion chamber again in a diesel engine, a gasoline engine (for example, a lean ban engine), and the like.
  • a valve device and a drive device that can be used as an exhaust gas recirculation device used when returning exhaust gas to a combustion chamber again in a diesel engine, a gasoline engine (for example, a lean ban engine), and the like.
  • FIG. 1 is a block diagram showing a conventional exhaust gas recirculation device using a stepping motor disclosed in, for example, Japanese Utility Model Publication No. 324,455, Showa 64.
  • 1 is a valve housing
  • 2 is a through passage formed to penetrate the valve housing
  • 3 is a valve disposed in the through passage 2
  • 4 is disposed so as to be able to linearly move with the valve 3.
  • 5 is a stepping motor mounted on the valve housing 1
  • 6 is a detecting means for detecting a moving amount of the rod 4 and outputting a moving amount signal
  • 7 is a moving amount signal together with the moving amount signal and an engine speed and the like.
  • This is control means to which a rotating load, a temperature, and other information are input and a predetermined number of pulses are output to the stepping motor 5 according to the information.
  • the initial state is a state in which the through passage is closed by the valve and the exhaust gas is not recirculated.
  • the control means 7 In such an initial state, when a signal such as an increase in the engine temperature is input, the control means 7 outputs a pulse to the stepping motor 5 in accordance with the increase in the temperature and the like.
  • Code 4 and valve 3 starts a linear movement, and the through-hole 2 is opened at a predetermined opening degree.
  • the opening of the valve 3 is set according to the type of the engine and the driving state.
  • the detecting means 6 detects the movement amount of the rod 4 corresponding to the opening degree of the valve 3, and the control means 7 determines the opening degree of the valve 3 based on the above control based on the movement amount signal from the detecting means 6. You can figure out.
  • the conventional valve device using the stepping motor 5 is configured as described above, the stepping motor 5 formed separately from the valve device is fixed to the housing 1, and Valve 3 and rod 4 need to be fixed to stepping module 5. Therefore, the disposition accuracy of the valve 3 with respect to the housing 1 is poor, and it is difficult to completely close the valve 3 when the valve 3 is closed.
  • FIG. 2 is a block diagram showing a valve body using a stepping motor 5 devised by the inventors prior to the present invention.
  • reference numeral 8 denotes a valve-side rod disposed so as to be able to move linearly together with the valve 3
  • 9 denotes a valve-side spring receiving member disposed on the opposite side of the valve-side rod 8 from the valve 3.
  • Reference numeral 10 denotes a valve-side spring disposed between the valve-side spring receiving member 9 and the valve housing 1.
  • Reference numeral 11 denotes a valve-side rod 8 which is driven in accordance with the rotation of the stepping motor 5. This is a drive side rod that moves in the movement direction. Structures other than the above are the same as those shown in FIG.
  • the drive-side rod 11 becomes the valve-side rod 8 according to the number of input pulses.
  • the drive side head 1 1 pushes down the valve side head 8, and as a result, the valve 3 opens at the opening corresponding to the number of input pulses.
  • the drive-side opening 11 moves in the opposite direction to the valve 3.
  • the valve-side rod 8 is opened by the force of the spring 10 in the valve-opening direction to the position where the drive-side rod 11 has moved.
  • the reverse drive is performed, the drive side rod 11 is separated from the valve side rod 8 and stops in that state.
  • valve 3 acts on the valve side spring 10 disposed between the housing 1 and the valve side spring receiving member 9. Close through-passage 2 with.
  • the valve 3 and the valve-side rod 8 can be fixed to the housing 1 without depending on the mounting accuracy of the stepping module 5 to the housing 1, so that the arrangement accuracy of the valve 3 to the housing 1 can be fixed. Therefore, when valve 3 is closed, it can be completely sealed.
  • valve device configured to use the valve-side opening 8 and the driving-side rod 11 to depress the valve 3 in this manner, the valve device is connected to the stepping motor 5 like a conventional valve device. Even if the amount of movement of the rod (drive side port 11) is detected, the opening of the valve 3 cannot be accurately and reliably controlled based on the detected amount.
  • the present invention has been made to solve the above-described problems, and it is possible to completely seal the valve when the valve is closed, and to more accurately and surely detect and control the opening degree of the valve.
  • the purpose of the present invention is to obtain a valve device that can perform pressure reduction. Disclosure of the invention
  • a valve device includes a valve housing, a through passage formed through the valve housing, a valve disposed in the through passage, a valve-side rod to which the valve is fixed, and a valve side.
  • a valve body having a valve-side spring for applying a force in a direction to close the valve to the rod; a stepping motor attached to the valve housing; and the valve-side opening according to the rotational driving force of the stepping motor.
  • a rotor having a screw thread while rotating about the axis of the rotor as a rotation axis, a drive-side mouth having a thread formed to abut against the screw thread at one end with a predetermined clearance, and the drive-side mouth described above.
  • Driving means for detecting the amount of movement of the drive-side head in the rotation axis direction and outputting a movement amount signal; and inputting a pulse to the stepping mode and inputting the pulse.
  • control means for detecting the state of the valve based on the movement amount signal that changes according to the condition.
  • the driving side head is attached to the steering mode, and the force in the valve closing direction is applied to the valve side head.
  • the valve on the drive side is returned to the retracted position so that the valve side rod does not act on the valve, so that the valve is sealed only with the force of the valve side spring. Can be closed.
  • valve is rotated with the axial direction of the valve side port as a rotation axis in accordance with the rotational driving force of the stepping motor, and has a thread and a thread with the thread and a predetermined clearance.
  • a stepping motor is composed of a drive-side rod having a thread formed in contact with the drive-side spring and a drive-side spring that applies a smaller force than the valve-side spring in the direction of the valve-side rod toward the drive-side opening. Since the driving force in the evening is transmitted to the valve-side opening, a detecting means for detecting the movement amount of the driving-side opening in the rotation axis direction and outputting a movement amount signal, and a stepping motor.
  • the control means detects a change amount of the movement amount signal before and after each pulse input each time the pulse is input, and the time when the change amount changes is detected.
  • the stop position of the valve is determined based on the ringing.
  • the control means detects a change amount of the movement amount signal before and after each pulse input, and changes the change amount every time each pulse is input. Since the stop position of the valve is determined based on the timing, for example, if an abnormal condition occurs, such as when the exhaust gas soot is clogged between the valve and the housing and the valve does not close completely, The abnormality of the fully closed state of the valve due to this can be determined.
  • the drive device includes: a stepping motor; In accordance with the rotational driving force of the damper shaft, the valve shaft rotates in the axial direction of the valve side rod as a rotation axis and has a screw thread, and the screw thread which comes into contact with the screw thread at the mouth with a predetermined clearance. And a drive-side spring for urging the valve-side spring with a smaller force in the direction of the valve-side rod with respect to the drive-side rod. It is.
  • the driving side rod when the driving rod is in contact with the valve rod, the driving side rod does not move even if a pulse is input in the stepping mode, so that the driving side port is not moved.
  • the driving side rod By grasping the change in the moving state, the seating position can be recognized.
  • FIG. 1 is a configuration diagram showing a conventional exhaust gas recirculation device using a stepping motor.
  • FIG. 2 is a configuration diagram showing a valve body using a stepping motor devised prior to the present invention.
  • FIG. 3 is a configuration diagram showing an engine system using the exhaust gas recirculation device according to Embodiment 1 of the present invention.
  • FIG. 4 is a sectional view showing the structure of the exhaust gas recirculation device according to Embodiment 1 of the present invention.
  • FIG. 5 is a partially enlarged cross-sectional view showing the driving means and its peripheral portion according to Embodiment 1 of the present invention (separated state).
  • FIG. 6 is a partially enlarged cross-sectional view showing the driving means and its peripheral portion according to the first embodiment of the present invention (contact start state).
  • FIG. 7 is a partially enlarged cross-sectional view showing the driving means and its peripheral portion according to Embodiment 1 of the present invention (transition state).
  • FIG. 8 is a partially enlarged cross-sectional view showing the driving means and its peripheral portion according to Embodiment 1 of the present invention (the valve opening operation start state).
  • FIG. 9 is a partially enlarged cross-sectional view showing the driving means and its peripheral portion according to Embodiment 1 of the present invention (valve opened state).
  • FIG. 10 is a diagram (a) showing the correspondence between the number of input pulses to the drive means and the output level of the detection means according to Embodiment 1 of the present invention, and the drive pulse showing the correspondence between the number of input pulses and the valve opening. It is a diagram (b) corresponding to the number one valve opening.
  • FIG. 11 is a flowchart showing an operation of determining whether the valve is completely closed according to the first embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 3 is a configuration diagram showing an engine system using an exhaust gas recirculation device according to Embodiment 1 of the present invention using a stepping motor (stepping motor).
  • reference numeral 12 denotes a four-cycle gasoline engine for an automobile that outputs a driving force by burning a mixture of air and fuel
  • reference numeral 13 denotes an end connected to the engine 12 and one end connected to the engine 12.
  • An air cleaner 14 is connected to the other end of the intake pipe 13 to supply air-fuel mixture and removes dust and the like contained in the outside air and sends air to the intake pipe 13.
  • Reference numeral 5 denotes an injector which is provided in the middle of the intake pipe 13 and injects gasoline into the intake pipe 13 (in the case of a diesel engine, the injector is a combustion chamber or (It is provided like 15 'because it is injected directly into the subchamber.)
  • a throttle valve that adjusts the amount of air-fuel mixture that is introduced (in the case of diesel engines, this throttle valve may not be provided), one end of which is connected to the engine 12 and one end of which is burned by the engine 12
  • Reference numeral 18 denotes a purification device disposed at the other end of the exhaust pipe 17 for purifying exhaust gas with a three-way catalyst and discharging the exhaust gas to the outside air.
  • Reference numeral 19 denotes an exhaust gas recirculation device for returning the sucked exhaust gas to the intake air
  • reference numeral 20 denotes an exhaust gas intake pipe for supplying exhaust gas from the exhaust pipe 17 to the exhaust gas recirculation device 19.
  • Valve lift control signal for gas recirculation device 19 Ru output to con Tororuyuni' Todea.
  • 12a is a combustion chamber
  • 12 is an intake valve that blocks communication between the intake pipe 13 and the combustion chamber 12a
  • 12c is an exhaust pipe 17
  • An exhaust valve that blocks communication between the combustion chamber 12a and 12d is a biston that moves up and down in the combustion chamber 12a.
  • FIG. 4 is a sectional view showing the structure of the exhaust gas recirculation device according to Embodiment 1 of the present invention.
  • 32 is a valve body
  • 33 is a driving means fixed to the valve body 32
  • 6 is a detecting means incorporated in the driving means 33
  • 7 is a moving amount signal input from the detecting means 6.
  • the control means outputs a pulse to the driving means 33.
  • valve body 3 2 1 is a valve housing body to which the exhaust gas intake pipe 20 and the exhaust gas recirculation pipe 21 are fixed, 2 is a through passage passing through the valve housing body 1, and 3 is a through passage. 8 is a valve-side rod to which the valve 3 is fixed, and 9 is a valve-side panel receiver provided at the one end of the valve-side opening 8. 10 is between the valve side spring receiving member 9 and the valve housing body 1 P
  • Reference numeral 9 designates a valve-side spring provided in the valve seat
  • reference numeral 23 designates a valve seat provided in the through passage and in contact with the valve 3.
  • 5 is a stepping motor that rotates by an amount corresponding to the number of pulses described above
  • 25 is a screw that rotates according to the rotational driving force of the stepping motor 5 and is adjacent in the direction of the rotation axis.
  • the thread having a female thread in which the thread 25 a and the thread 25 a are spaced apart from each other, 11 is arranged in conformity with the thread 25 a of the thread 25 and
  • the drive side rod having male threads in which the adjacent thread 11 1a and the thread 11 1a are separated from each other, and 27 is connected to the valve side port 8 with respect to the drive side rod 11
  • a drive-side spring that applies a force in the direction of contact.
  • the driving spring 27 causes the screw 11 a of the driving rod 11 to hit the screw 25 a of the rotor 25. You will be in contact. In addition, the opposite side of the collapse contact portion of the thread 11a of the drive side rod 11 is separated by a predetermined clearance.
  • reference numeral 28 is integrally fixed to the other end of the driving rod 11 and the detection port having a projection 28a formed on the side surface.
  • Reference numeral 29 denotes a detection port.
  • a resistor plate 30 is disposed so as to abut on the protrusion 28a, and a constant voltage is applied to one end of the resistor plate 29, The detection main body receives a voltage level signal at a predetermined detection point between the voltage application point and the contact point of the protrusion 28a. Since the detection rod 28 is grounded through the drive spring 27 and the drive port 11, the detection rod 28 moves together with the drive port 11. Changes the resistance partial pressure ratio at the detection point Then, the voltage level at the detection point increases or decreases accordingly.
  • FIGS. 5 to 9 are partially enlarged sectional views showing the driving means 33 and its peripheral portion according to the first embodiment of the present invention.
  • FIG. 5 shows a state in which the drive side head 8 is separated from the valve side head 11.
  • the drive spring 11 attempts to move in the direction of the valve rod 8 due to the force of the drive spring 27, but as shown in the figure, the thread 25 a of the rotor 25 is detected.
  • the surface facing the application rod 28 is kept in a separated state by contacting the thread 11 a of the driving rod 11.
  • FIG. 10 (a) is an input pulse number-one level correspondence diagram showing a correspondence relationship between the number of input pulses to the driving means 33 and the output level of the detection means according to Embodiment 1 of the present invention.
  • the horizontal axis is the number of input pulses input to the stepping mode 5
  • the vertical axis is the voltage level signal at the detection means 6. Then, 1 is the separated state, 2 is the contact start state, 3 is the transition state, 4 is the valve opening operation start state, and 5 is the valve open state.
  • the voltage level signal does not change even if a pulse is input.
  • the return amount of the valve-side rod 8 is correspondingly increased.
  • FIG. 10 (b) is a diagram showing the correspondence between the number of drive pulses and the valve opening, which indicates the correspondence between the number of input pulses to the exhaust gas recirculation device and the valve opening according to Embodiment 1 of the present invention.
  • the horizontal axis is the number of drive pulses input to stepping mode 5
  • the vertical axis is the valve opening (valve movement).
  • the valve opening characteristic as shown by the solid line in the figure is obtained, and when the valve 3 is not completely closed, it is shown by the dashed line in the figure. It changes to such a valve opening characteristic.
  • control means 7 sends an excessive pulse to the stepping motor 5 so that the driving rod 11 and the detecting rod 28 return to the position farthest from the valve 3.
  • FIG. 11 is a flowchart showing an operation of determining whether the valve is completely closed according to the first embodiment of the present invention. This flowchart is executed, for example, at the start of the stepping mode overnight drive.
  • ST 1 is a first reading step for reading the output level L (N) of the detecting means 30 at the N step
  • ST 2 is a pulse driving step for inputting a pulse for one step in a normal state.
  • ST 3 is a transition state during normal operation.
  • (N + 1) The second reading step for reading the output level L (N + 1) of the detecting means 30 at the time of the (N + 1) step.
  • the output level difference (IL (N) -L (N + 1) I) is smaller than a predetermined allowable level difference X (for example, a change in the output level in one step when the valve is open).
  • ST 5 is a detection loop step for substituting N + 1 for N when the output level difference is equal to or greater than the predetermined allowable level difference X, and returning to the first reading step ST 1.
  • ST 6 is where N is when the output level difference is smaller than the predetermined allowable level difference X.
  • ST 7 is an abnormality judgment step for judging whether or not N is within a predetermined allowable range (A ⁇ X ⁇ B).
  • ST 7 is a seating position normal processing step executed when N is within a predetermined allowable range.
  • ST6 is a seating position abnormality processing step executed when N is outside a predetermined allowable range.
  • a predetermined process can be performed by performing an abnormality determination in the fully closed state of the valve based on a change in the output level of the plurality of movement amount signals.
  • the output level L (N) at the N step and the output level L (N + 1) at the (N + 1) step Is detected by comparing the output level L (N) at the N-step with the output level L (N-1) at the (N-1) step. May be performed.
  • the driving rod 11 is attached to the stepping motor 5 and the force in the valve closing direction is applied to the valve rod 8.
  • closing valve 3 return valve 11 to the retracted position where no force is applied to valve 8 so that valve 3 is sealed only with the force of valve spring 10. Can be closed to the state.
  • the rotary shaft 25 rotates about the axial direction of the valve side port 8 as a rotation axis and has a screw thread 25 a.
  • Drive side rod 11 formed with thread 11 1a that abuts with 5a with a specified clearance, and valve side spring in the direction of valve side rod 8 with respect to drive side rod 11 Since the driving force of the stepping motor 5 is transmitted to the valve-side rod 8 with the driving-side spring 27 that applies a force smaller than 10, the rotation axis of the driving-side rod 11
  • a pulse is input to the detection means 6 that detects the amount of movement in the direction and outputs a movement amount signal, and a pulse is input to the stepping motor 5, and a valve is provided based on the movement amount signal that changes according to the input of the pulse.
  • Control means 7 for detecting the state of 3 With this arrangement, the opening of the valve 3 can be accurately detected and controlled accurately.
  • valve 3 At the start of driving of the control means 7 force stepping motor 5, each time a pulse is input, a change amount of a movement amount signal before and after the pulse input is detected, and the change amount is detected.
  • the stop position of valve 3 is determined based on the timing at which valve 3 changes, so valve 3 is completely closed, for example, when exhaust gas soot is clogged between valve 3 and housing 1. If an abnormal state such as not turning occurs, it is possible to determine whether the valve 3 is in a fully closed state due to the abnormal state.
  • the driving means (driving device) is provided with the stepping motor 5 and the rotation of the axis of the valve-side rod 8 according to the rotational driving force of the stepping motor 5. And a drive rod 11 formed with a screw thread 11a that is in contact with this screw thread 25a with a predetermined clearance.
  • a drive spring 27 that urges a smaller force than the valve spring 10 in the direction of the valve head 8 with respect to the drive head 11 in the direction of the valve head 8
  • the drive lock is provided.
  • the drive rod 11 does not move even if a pulse is input to the stepper module 5, so that the drive rod 11 moves.
  • Position can be recognized.
  • valve device and the drive device according to the present invention can be used with high accuracy in an exhaust gas recirculation device or the like of an internal combustion engine while preventing the engine output from being reduced due to unnecessary exhaust gas recirculation. It is suitable for controlling the amount of exhaust gas recirculation.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Electrically Driven Valve-Operating Means (AREA)

Abstract

A valving device and a drive unit which can be used therefor. A rod on the valve side, fitted with a valve and positioned in a valve housing by a spring on the valve side, is pressed by a rod on the drive side fitted to a stepping motor to completely block a through passage with the valve. The drive-side rod is loosely fitted to the stepping motor. By detecting the shifting characteristics of this drive-side rod, the timing at which the valve starts opening is found from the number of pulses inputted into the stepping motor and the characteristics of the drive-side rod.

Description

明 細 バルブ装置および駆動装置 技術分野  Description Valve device and drive device Technical field
この発明は、 ディーゼルエンジン、 ガソ リ ンエンジン （例えば、 リー ンバンエンジン） などにおいて排気ガスを再度燃焼室に戻す際に使用さ れる排気ガス還流装置などとして利用できるバルブ装置および駆動装置 に関するものである。 背景技術  The present invention relates to a valve device and a drive device that can be used as an exhaust gas recirculation device used when returning exhaust gas to a combustion chamber again in a diesel engine, a gasoline engine (for example, a lean ban engine), and the like. . Background art
第 1 図は例えば日本国実用新案公開公報昭和 6 4年第 3 2 4 5 5号に 開示されたステッ ピングモ一夕を用いた従来の排気ガス還流装置を示す 構成図である。 図において、 1 はバルブハウジング、 2はバルブハウジ ング 1 を貫通するように形成された貫通路、 3 はこの貫通路 2内に配設 されたバルブ、 4はバルブ 3 とともに直線運動可能に配設された口ッ ド 、 5はバルブハウジング 1 に取り付けられるステツ ビングモー夕、 6は ロッ ド 4の移動量を検出して移動量信号を出力する検出手段、 7はこの 移動量信号とともにエンジンの回転数や回転負荷、 温度、 その他の情報 が入力され、 これらに応じてステッピングモー夕 5へ所定の数のパルス を出力する制御手段である。  FIG. 1 is a block diagram showing a conventional exhaust gas recirculation device using a stepping motor disclosed in, for example, Japanese Utility Model Publication No. 324,455, Showa 64. In the figure, 1 is a valve housing, 2 is a through passage formed to penetrate the valve housing 1, 3 is a valve disposed in the through passage 2, and 4 is disposed so as to be able to linearly move with the valve 3. 5 is a stepping motor mounted on the valve housing 1, 6 is a detecting means for detecting a moving amount of the rod 4 and outputting a moving amount signal, 7 is a moving amount signal together with the moving amount signal and an engine speed and the like. This is control means to which a rotating load, a temperature, and other information are input and a predetermined number of pulses are output to the stepping motor 5 according to the information.
次に動作について説明する。 排気ガス還流装置では、 バルブにより貫 通路が閉塞されて、 排気ガスを還流させない状態が初期状態となる。  Next, the operation will be described. In the exhaust gas recirculation device, the initial state is a state in which the through passage is closed by the valve and the exhaust gas is not recirculated.
このような初期状態において、 エンジン温度上昇などの信号が入力さ れると、 制御手段 7はその温度上昇などに応じてステッ ピングモ一夕 5 にパルスを出力し、 このパルス数に応じた分だけロッ ド 4およびバルブ 3は直線移動を開始し、 所定の開度で貫通路 2は開状態となる。 なお、 このバルブ 3の開度はエンジンの種類や駆動状態に応じて設定される。 そして、 検出手段 6はバルブ 3の開度に対応するロッ ド 4の移動量を 検出し、 制御手段 7 はこの検出手段 6からの移動量信号に基づいて上記 制御に基づくバルブ 3の開度を把握することができる。 In such an initial state, when a signal such as an increase in the engine temperature is input, the control means 7 outputs a pulse to the stepping motor 5 in accordance with the increase in the temperature and the like. Code 4 and valve 3 starts a linear movement, and the through-hole 2 is opened at a predetermined opening degree. The opening of the valve 3 is set according to the type of the engine and the driving state. Then, the detecting means 6 detects the movement amount of the rod 4 corresponding to the opening degree of the valve 3, and the control means 7 determines the opening degree of the valve 3 based on the above control based on the movement amount signal from the detecting means 6. You can figure out.
しかしながら、 ステッ ピングモ一夕 5 を用いた従来のバルブ装置は以 上のように構成されているので、 ハウジング 1 にそれとは別体に形成さ れたステッピングモー夕 5 を固定し、 さ らにこのステッピングモ一夕 5 に対してバルブ 3およびロッ ド 4を固定する必要がある。 従って、 バル ブ 3のハウジング 1 に対する配設精度が悪く、 バルブ 3 を閉じた際に完 全に密閉させることは困難である。  However, since the conventional valve device using the stepping motor 5 is configured as described above, the stepping motor 5 formed separately from the valve device is fixed to the housing 1, and Valve 3 and rod 4 need to be fixed to stepping module 5. Therefore, the disposition accuracy of the valve 3 with respect to the housing 1 is poor, and it is difficult to completely close the valve 3 when the valve 3 is closed.
そこで、 発明者らはこの発明に先立って新たなステッ ピングモー夕 5 を用いたバルブ装置を考案している。 第 2図は発明者らが本願発明に先 立って考案したステッピングモー夕 5 を用いたバルブ本体を示す構成図 である。 図において、 8はバルブ 3 とともに直線移動可能に配設された バルブ側ロッ ドであり、 9はこのバルブ側ロッ ド 8のバルブ 3 とは反対 側に配設されたバルブ側バネ受部材であり、 1 0 はバルブ側バネ受部材 9 とバルブハウジング 1 との間に配設されたバルブ側スプリ ングであり 、 1 1 はステッピングモー夕 5の回転駆動に応じてバルブ側ロッ ド 8を 上記直線移動方向に移動させる駆動側ロッ ドである。 これ以外の構成は 第 1図と同様であり同一の符号を付して説明を省略する。  Therefore, the inventors have devised a valve device using a new stepping motor 5 prior to the present invention. FIG. 2 is a block diagram showing a valve body using a stepping motor 5 devised by the inventors prior to the present invention. In the figure, reference numeral 8 denotes a valve-side rod disposed so as to be able to move linearly together with the valve 3, and 9 denotes a valve-side spring receiving member disposed on the opposite side of the valve-side rod 8 from the valve 3. Reference numeral 10 denotes a valve-side spring disposed between the valve-side spring receiving member 9 and the valve housing 1. Reference numeral 11 denotes a valve-side rod 8 which is driven in accordance with the rotation of the stepping motor 5. This is a drive side rod that moves in the movement direction. Structures other than the above are the same as those shown in FIG.
次に動作について説明する。  Next, the operation will be described.
駆動側口ッ ド 1 1 とバルブ側ロッ ド 8 とが離間した状態においてステ ッビングモー夕 5にパルスが入力されると、 この入力パルス数に応じて 駆動側ロッ ド 1 1 はバルブ側ロッ ド 8のほうへ移動してこのバルブ側口 ッ ド 8 に当接する。 更にステッ ピングモー夕 5 にパルスが入力されると 、 駆動側口ッ ド 1 1 はバルブ側口ッ ド 8 を押し下げ、 その結果バルブ 3 は上記入力パルス数に応じた開度で開く。 また、 ステッ ピングモ一夕 5 を逆側に回転させると、 駆動側口ッ ド 1 1 はバルブ 3 と反対方向に移動 する。 この時、 バルブ側ロッ ド 8 はスプリ ング 1 0の開弁方向の力によ り、 駆動側ロッ ド 1 1が移動した位置まで開弁する。 さ らに、 逆駆動さ せると駆動側ロッ ド 1 1 はバルブ側ロッ ド 8から離間し、 その状態で停 止する。 When a pulse is input to the stepping mode 5 in a state where the drive-side port 11 and the valve-side rod 8 are separated, the drive-side rod 11 becomes the valve-side rod 8 according to the number of input pulses. To contact the valve side port 8. Further, when a pulse is input to stepping mode 5, However, the drive side head 1 1 pushes down the valve side head 8, and as a result, the valve 3 opens at the opening corresponding to the number of input pulses. When the stepping motor 5 is rotated in the opposite direction, the drive-side opening 11 moves in the opposite direction to the valve 3. At this time, the valve-side rod 8 is opened by the force of the spring 10 in the valve-opening direction to the position where the drive-side rod 11 has moved. Further, when the reverse drive is performed, the drive side rod 11 is separated from the valve side rod 8 and stops in that state.
このような構成であれば、 駆動側ロッ ド 1 1が離間した状態では、 バ ルブ 3はハウジング 1 とバルブ側バネ受部材 9 との間に配設されたバル ブ側スプリ ング 1 0の作用で貫通路 2 を閉塞する。 特に、 この状態では 、 ステツピングモ一夕 5 のハウジング 1 に対する取り付け精度によるこ となく、 ハウジング 1 に対するバルブ 3およびバルブ側ロッ ド 8 を固定 することができるので、 バルブ 3の八ウジング 1 に対する配設精度がよ く、 バルブ 3 を閉じた際に完全に密閉させることができる。  With such a configuration, when the drive side rod 11 is separated, the valve 3 acts on the valve side spring 10 disposed between the housing 1 and the valve side spring receiving member 9. Close through-passage 2 with. In particular, in this state, the valve 3 and the valve-side rod 8 can be fixed to the housing 1 without depending on the mounting accuracy of the stepping module 5 to the housing 1, so that the arrangement accuracy of the valve 3 to the housing 1 can be fixed. Therefore, when valve 3 is closed, it can be completely sealed.
しかしながら、 このようにバルブ 3 を押し下げるためにバルブ側口ッ ド 8および駆動側ロッ ド 1 1 を用いるように構成したバルブ装置では、 従来のバルブ装置のようにステッ ピングモ一夕 5 に接続されるロッ ド （ 駆動側口ッ ド 1 1 ) の移動量を検出してもそれに基づいてバルブ 3の開 度を精度良く確実に制御することはできない。  However, in the valve device configured to use the valve-side opening 8 and the driving-side rod 11 to depress the valve 3 in this manner, the valve device is connected to the stepping motor 5 like a conventional valve device. Even if the amount of movement of the rod (drive side port 11) is detected, the opening of the valve 3 cannot be accurately and reliably controlled based on the detected amount.
つまり、 閉状態においては駆動側ロッ ド 1 1がバルブ側ロッ ド 8から 離間した状態となっているので、 ステッ ピングモー夕 5 にパルスを入力 してもすぐにバルブ 3が開く ことはなく 、 駆動側口ッ ド 1 1がバルブ側 ロッ ド 8に当接して初めてバルブ 3が開き始めることになる。 そして、 このバルブ 3が開き始めるまでに入力するパルス数が予め判っていれば いいが、 実際には、 ハウジング 1 に対するステッ ピングモー夕 5の取り 付け精度などに起因して個々のバルブ装置においてそのパルス数を把握 することは非常に困難である。 In other words, in the closed state, since the drive side rod 11 is separated from the valve side rod 8, even if a pulse is input to the stepping mode 5, the valve 3 does not open immediately, and the drive Valve 3 starts to open only after side port 1 1 contacts valve side rod 8. It is sufficient that the number of pulses to be input before the valve 3 starts to be opened is known in advance, but in practice, the pulse number is determined in each valve device due to the mounting accuracy of the stepping motor 5 to the housing 1 and the like. Know the number It is very difficult to do.
また、 バルブ 3 と弁座との間に異物が付着し、 閉弁が不能となった場 合にもこれを検知することは難しい。  Also, it is difficult to detect when foreign matter adheres between the valve 3 and the valve seat and the valve cannot be closed.
この発明は上記のような課題を解決するためになされたもので、 バル ブを閉じた際に完全に密閉させることができ、 しかも、 バルブの開度を 精度良く確実に検知して制御することができるバルブ装置を得ることを 目的とする。 発明の開示  SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is possible to completely seal the valve when the valve is closed, and to more accurately and surely detect and control the opening degree of the valve. The purpose of the present invention is to obtain a valve device that can perform pressure reduction. Disclosure of the invention
この発明に係るバルブ装置は、 バルブハウジング、 上記バルブハウジ ングを貫通するように形成された貫通路、 上記貫通路内に配設されたバ ルブ、 上記バルブが固定されたバルブ側ロッ ド、 バルブ側ロッ ドに対し てバルブを閉じる方向の力を作用させるバルブ側スプリ ングを有するバ ルブ本体と、 上記バルブハウジングに取り付けられるステッ ピングモー 夕、 上記ステツビングモー夕の回転駆動力に応じて上記バルブ側口ッ ド の軸方向を回転軸として回転するとともにネジ山を有するロータ、 この 口一夕のネジ山と所定のク リアランスをもって当接するネジ山が形成さ れた駆動側口ッ ド、 上記駆動側口ッ ドに対して上記バルブ側ロッ ドの方 向に上記バルブ側スプリ ングより も小さい力を付勢する駆動側スプリ ン グを有する駆動手段と、 上記駆動側口ッ ドの上記回転軸方向における移 動量を検出して移動量信号を出力する検出手段と、 上記ステッピングモ 一夕に対してパルスを入力するとともに、 このパルスの入力に応じて変 化する移動量信号に基づいてバルブの状態を検出する制御手段とを備え たものである。  A valve device according to the present invention includes a valve housing, a through passage formed through the valve housing, a valve disposed in the through passage, a valve-side rod to which the valve is fixed, and a valve side. A valve body having a valve-side spring for applying a force in a direction to close the valve to the rod; a stepping motor attached to the valve housing; and the valve-side opening according to the rotational driving force of the stepping motor. A rotor having a screw thread while rotating about the axis of the rotor as a rotation axis, a drive-side mouth having a thread formed to abut against the screw thread at one end with a predetermined clearance, and the drive-side mouth described above. Drive spring that applies a smaller force to the valve than the valve-side spring in the direction of the valve-side rod. Driving means for detecting the amount of movement of the drive-side head in the rotation axis direction and outputting a movement amount signal; and inputting a pulse to the stepping mode and inputting the pulse. And control means for detecting the state of the valve based on the movement amount signal that changes according to the condition.
このようなバルブ装置によれば、 ステツ ビングモー夕には駆動側口ッ ドを取り付けるとともに、 バルブ側口ッ ドにはバルブを閉じる方向の力 を作用させているので、 バルブを閉じる際にはバルブ側ロッ ドにカを作 用させない待避位置まで駆動側口ッ ドを戻すことにより、 バルブ側スプ リ ングの力のみでバルブを密閉状態に閉じることができる。 According to such a valve device, the driving side head is attached to the steering mode, and the force in the valve closing direction is applied to the valve side head. When the valve is closed, the valve on the drive side is returned to the retracted position so that the valve side rod does not act on the valve, so that the valve is sealed only with the force of the valve side spring. Can be closed.
また、 ステツピングモ一夕の回転駆動力に応じてバルブ側口ッ ドの軸 方向を回転軸として回転するとともにネジ山を有する口一夕と、 この口 一夕のネジ山と所定のク リアランスをもって当接するネジ山が形成され た駆動側ロッ ドと、 駆動側口ッ ドに対してバルブ側ロッ ドの方向にバル ブ側スプリ ングより も小さい力を付勢する駆動側スプリ ングとでステツ ピングモ一夕の駆動力をバルブ側口ッ ドに伝達するように構成したので 、 駆動側口ッ ドの回転軸方向における移動量を検出して移動量信号を出 力する検出手段と、 ステッ ピングモー夕に対してパルスを入力するとと もに、 このパルスの入力に応じて変化する移動量信号に基づいてバルブ の状態を検出する制御手段とを設けることにより、 バルブの開度を精度 良く確実に検知して制御することができる。  In addition, the valve is rotated with the axial direction of the valve side port as a rotation axis in accordance with the rotational driving force of the stepping motor, and has a thread and a thread with the thread and a predetermined clearance. A stepping motor is composed of a drive-side rod having a thread formed in contact with the drive-side spring and a drive-side spring that applies a smaller force than the valve-side spring in the direction of the valve-side rod toward the drive-side opening. Since the driving force in the evening is transmitted to the valve-side opening, a detecting means for detecting the movement amount of the driving-side opening in the rotation axis direction and outputting a movement amount signal, and a stepping motor. By inputting a pulse and providing control means for detecting the state of the valve based on a moving amount signal that changes in response to the input of the pulse, the opening of the valve can be accurately and reliably determined. It can be detected and controlled.
この発明に係るバルブ装置は、 制御手段が、 ステッ ピングモー夕駆動 開始時には、 各パルスを入力する度にそのパルス入力の前後における移 動量信号の変化量を検出し、 その変化量が変化するタイ ミ ングに基づい てバルブの停止位置を判断するものである。  In the valve device according to the present invention, at the start of the stepping motor drive, the control means detects a change amount of the movement amount signal before and after each pulse input each time the pulse is input, and the time when the change amount changes is detected. The stop position of the valve is determined based on the ringing.
このようなバルブ装置によれば、 制御手段が、 ステッ ピングモー夕駆 動開始時には、 各パルスを入力する度にそのパルス入力の前後における 移動量信号の変化量を検出し、 その変化量が変化するタイミ ングに基づ いてバルブの停止位置を判断するので、 例えばバルブとハウジングとの 間に排気ガスの煤などがつまってしまってバルブが完全に閉まらないな どの異常状態が発生した場合には、 それによるバルブの全閉状態の異常 を判断することができる。  According to such a valve device, at the start of the stepping mode driving, the control means detects a change amount of the movement amount signal before and after each pulse input, and changes the change amount every time each pulse is input. Since the stop position of the valve is determined based on the timing, for example, if an abnormal condition occurs, such as when the exhaust gas soot is clogged between the valve and the housing and the valve does not close completely, The abnormality of the fully closed state of the valve due to this can be determined.
この発明に係る駆動装置は、 ステッ ピングモー夕と、 上記ステツピン ダモー夕の回転駆動力に応じて上記バルブ側ロッ ドの軸方向を回転軸と して回転するとともにネジ山を有するロー夕と、 この口一夕のネジ山と 所定のクリアランスをもって当接するネジ山が形成された駆動側口ッ ド と、 上記駆動側ロッ ドに対して上記バルブ側ロッ ドの方向に上記バルブ 側スプリ ングょりも小さい力を付勢する駆動側スプリ ングとを備えたも のである。 The drive device according to the present invention includes: a stepping motor; In accordance with the rotational driving force of the damper shaft, the valve shaft rotates in the axial direction of the valve side rod as a rotation axis and has a screw thread, and the screw thread which comes into contact with the screw thread at the mouth with a predetermined clearance. And a drive-side spring for urging the valve-side spring with a smaller force in the direction of the valve-side rod with respect to the drive-side rod. It is.
このような駆動装置によれば、 駆動ロッ ドがバルブロッ ドと当接した 状態においては、 ステッピングモー夕にパルスを入力しても駆動側ロッ ドが移動しなくなるので、 その駆動側口ッ ドの移動状態の変化を把握す ることにより、 着座位置を認識することができる。 図面の簡単な説明  According to such a driving device, when the driving rod is in contact with the valve rod, the driving side rod does not move even if a pulse is input in the stepping mode, so that the driving side port is not moved. By grasping the change in the moving state, the seating position can be recognized. BRIEF DESCRIPTION OF THE FIGURES
第 1 図はステッ ピングモー夕を用いた従来の排気ガス還流装置を示す 構成図である。  FIG. 1 is a configuration diagram showing a conventional exhaust gas recirculation device using a stepping motor.
第 2図は本願発明に先立って考案したステツビングモー夕を用いたバ ルブ本体を示す構成図である。  FIG. 2 is a configuration diagram showing a valve body using a stepping motor devised prior to the present invention.
第 3図はこの発明の実施の形態 1 による排気ガス還流装置を利用した エンジンシステムを示す構成図である。  FIG. 3 is a configuration diagram showing an engine system using the exhaust gas recirculation device according to Embodiment 1 of the present invention.
第 4図はこの発明の実施の形態 1 による排気ガス還流装置の構造を示 す断面図である。  FIG. 4 is a sectional view showing the structure of the exhaust gas recirculation device according to Embodiment 1 of the present invention.
第 5図はこの発明の実施の形態 1 による駆動手段およびその周辺部を 示す一部拡大断面図である （離間状態）。  FIG. 5 is a partially enlarged cross-sectional view showing the driving means and its peripheral portion according to Embodiment 1 of the present invention (separated state).
第 6図はこの発明の実施の形態 1 による駆動手段およびその周辺部を 示す一部拡大断面図である （当接開始状態）。  FIG. 6 is a partially enlarged cross-sectional view showing the driving means and its peripheral portion according to the first embodiment of the present invention (contact start state).
第 7図はこの発明の実施の形態 1 による駆動手段およびその周辺部を 示す一部拡大断面図である （遷移状態）。 P FIG. 7 is a partially enlarged cross-sectional view showing the driving means and its peripheral portion according to Embodiment 1 of the present invention (transition state). P
7 第 8図はこの発明の実施の形態 1 による駆動手段およびその周辺部を 示す一部拡大断面図である （バルブ開動作開始状態）。  7 FIG. 8 is a partially enlarged cross-sectional view showing the driving means and its peripheral portion according to Embodiment 1 of the present invention (the valve opening operation start state).
第 9図はこの発明の実施の形態 1 による駆動手段およびその周辺部を 示す一部拡大断面図である （バルブ開状態）。  FIG. 9 is a partially enlarged cross-sectional view showing the driving means and its peripheral portion according to Embodiment 1 of the present invention (valve opened state).
第 1 0図はこの発明の実施の形態 1 による駆動手段への入力パルス数 と検出手段の出力レベルとの対応関係図 （ a ) および入力パルス数と弁 開度との対応関係を示す駆動パルス数一弁開度対応図 （ b ) である。 第 1 1 図はこの発明の実施の形態 1 におけるバルブ完閉判別動作を示 すフローチヤ一 トである。 発明を実施するための最良の形態  FIG. 10 is a diagram (a) showing the correspondence between the number of input pulses to the drive means and the output level of the detection means according to Embodiment 1 of the present invention, and the drive pulse showing the correspondence between the number of input pulses and the valve opening. It is a diagram (b) corresponding to the number one valve opening. FIG. 11 is a flowchart showing an operation of determining whether the valve is completely closed according to the first embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
以下、 この発明をより詳細に説明するために、 この発明を実施するた めの最良の形態について、 添付の図面に従って説明する。  Hereinafter, in order to explain this invention in greater detail, the preferred embodiments of the present invention will be described with reference to the accompanying drawings.
実施の形態 1 . Embodiment 1
第 3図はステッ ピングモータ （ステッ ピングモ一夕） を利用したこの 発明の実施の形態 1 による排気ガス還流装置を利用したエンジンシステ ムを示す構成図である。 なお、 ここでは特にガソリ ンエンジンとディ一 ゼルエンジンとについて説明する。 図において、 1 2は空気と燃料との 混合気を燃焼させて駆動力を出力する自動車用 4サイクルガソリ ンェン ジンであり、 1 3は一端が当該エンジン 1 2 に接続されてエンジン 1 2 に上記混合気を供給する吸気管であり、 1 4はこの吸気管 1 3の他端に 接続されて外気に含まれる粉塵などを除去して空気を吸気管 1 3 に送り 込むエアク リーナであり、 1 5は上記吸気管 1 3の途中に設けられ、 当 該吸気管 1 3内にガソリ ンを噴射するイ ンジェク夕であり （ここで、 デ ィ一ゼルエンジンの場合にはィ ンジェクタは燃焼室もしくは副室に直接 噴射するので、 1 5 ' のように設けられる）、 1 6 はエンジン 1 2 に吸 入される混合気の量を調整するスロッ トルバルブ （ディーゼルエンジン の場合にはこのスロッ トルバルブを設けない場合もある） であり、 1 7 は一端がエンジン 1 2 に接続されてエンジン 1 2で燃焼された混合気 （ 排気ガス） を排出する排気管であり、 1 8は排気管 1 7 の他端に配設さ れて三元触媒などにより排気ガスを浄化して外気に排出する浄化装置で あり、 1 9は吸引した排気ガスを吸気へ還流する排気ガス還流装置であ り、 2 0は排気管 1 7から排気ガス還流装置 1 9 に排気ガスを供給する 排気ガス吸気管であり、 2 1 は排気ガス還流装置 1 9から還流される排 気ガスをスロッ トルバルブ 1 6 とエンジン 1 2 との間の吸気管 1 3 に戻 す排気ガス還流管であり、 2 2は走行状態に応じて排気ガス還流装置 1 9に対してバルブリ フ ト制御信号を出力するコン トロールュニッ トであ る。 なお、 自動車用 4サイクルガソリ ンエンジン 1 2 において、 1 2 a は燃焼室、 1 2 は吸気管 1 3 と燃焼室 1 2 a との連通を閉塞する吸気 バルブ、 1 2 c は排気管 1 7 と燃焼室 1 2 a との連通を閉塞する排気バ ルブ、 1 2 dは燃焼室 1 2 a内を上下に移動するビス トンである。 FIG. 3 is a configuration diagram showing an engine system using an exhaust gas recirculation device according to Embodiment 1 of the present invention using a stepping motor (stepping motor). Here, the gasoline engine and the diesel engine will be particularly described. In the figure, reference numeral 12 denotes a four-cycle gasoline engine for an automobile that outputs a driving force by burning a mixture of air and fuel, and reference numeral 13 denotes an end connected to the engine 12 and one end connected to the engine 12. An air cleaner 14 is connected to the other end of the intake pipe 13 to supply air-fuel mixture and removes dust and the like contained in the outside air and sends air to the intake pipe 13. Reference numeral 5 denotes an injector which is provided in the middle of the intake pipe 13 and injects gasoline into the intake pipe 13 (in the case of a diesel engine, the injector is a combustion chamber or (It is provided like 15 'because it is injected directly into the subchamber.) A throttle valve that adjusts the amount of air-fuel mixture that is introduced (in the case of diesel engines, this throttle valve may not be provided), one end of which is connected to the engine 12 and one end of which is burned by the engine 12 Reference numeral 18 denotes a purification device disposed at the other end of the exhaust pipe 17 for purifying exhaust gas with a three-way catalyst and discharging the exhaust gas to the outside air. Reference numeral 19 denotes an exhaust gas recirculation device for returning the sucked exhaust gas to the intake air, and reference numeral 20 denotes an exhaust gas intake pipe for supplying exhaust gas from the exhaust pipe 17 to the exhaust gas recirculation device 19. Is an exhaust gas recirculation pipe that returns the exhaust gas recirculated from the exhaust gas recirculation device 19 to the intake pipe 13 between the throttle valve 16 and the engine 12. Valve lift control signal for gas recirculation device 19 Ru output to con Tororuyuni' Todea. In the four-cycle gasoline engine 12 for automobiles, 12a is a combustion chamber, 12 is an intake valve that blocks communication between the intake pipe 13 and the combustion chamber 12a, and 12c is an exhaust pipe 17 An exhaust valve that blocks communication between the combustion chamber 12a and 12d is a biston that moves up and down in the combustion chamber 12a.
第 4図はこの発明の実施の形態 1 による排気ガス還流装置の構造を示 す断面図である。 図において、 3 2はバルブ本体、 3 3 はバルブ本体 3 2に固定される駆動手段、 6は駆動手段 3 3の内部に組み込まれた検出 手段、 7はこの検出手段 6から移動量信号が入力されて、 駆動手段 3 3 に対してパルスを出力する制御手段である。  FIG. 4 is a sectional view showing the structure of the exhaust gas recirculation device according to Embodiment 1 of the present invention. In the figure, 32 is a valve body, 33 is a driving means fixed to the valve body 32, 6 is a detecting means incorporated in the driving means 33, and 7 is a moving amount signal input from the detecting means 6. The control means outputs a pulse to the driving means 33.
バルブ本体 3 2 において、 1 は排気ガス吸気管 2 0および排気ガス還 流管 2 1が固定されるバルブハウジング本体であり、 2 はバルブハウジ ング本体 1 を貫通する貫通路であり、 3 は貫通路の途中に配設されたバ ルブであり、 8はこのバルブ 3が固定されたバルブ側ロッ ドであり、 9 はこのバルブ側口ッ ド 8の上記一端側に配設されたバルブ側パネ受部材 であり、 1 0はバルブ側バネ受部材 9 とバルブハウジング本体 1 との間 P In the valve body 3 2, 1 is a valve housing body to which the exhaust gas intake pipe 20 and the exhaust gas recirculation pipe 21 are fixed, 2 is a through passage passing through the valve housing body 1, and 3 is a through passage. 8 is a valve-side rod to which the valve 3 is fixed, and 9 is a valve-side panel receiver provided at the one end of the valve-side opening 8. 10 is between the valve side spring receiving member 9 and the valve housing body 1 P
9 に配設されたバルブ側スプリ ングであり、 2 3は貫通路に配設されてバ ルブ 3 と当接する弁座である。 そして、 バルブ側ロッ ド 8 に対して駆動 手段 3 3 による力が作用していない状態では、 バルブ側スプリ ング 1 0 の力によりバルブ 3は弁座 2 3 と当接する方向に引っ張られ、 これによ り貫通路 2は閉塞される。  Reference numeral 9 designates a valve-side spring provided in the valve seat, and reference numeral 23 designates a valve seat provided in the through passage and in contact with the valve 3. When no force is applied to the valve-side rod 8 by the driving means 33, the force of the valve-side spring 10 pulls the valve 3 in a direction in which it contacts the valve seat 23. As a result, the passage 2 is closed.
駆動手段 3 3 において、 5は上記パルスの数に応じた量だけ回転する ステッ ピングモー夕、 2 5はステッピングモ一夕 5の回転駆動力に応じ て回転するとともに、 その回転軸の方向において隣り合うネジ山 2 5 a とネジ山 2 5 a とが離間している雌ネジを有するロー夕、 1 1 はロー夕 2 5のネジ山 2 5 a と適合して配設されるとともに、 この回転軸方向に おいて隣り合うネジ山 1 1 a とネジ山 1 1 a とが離間している雄ネジを 有する駆動側ロッ ド、 2 7は駆動側ロッ ド 1 1 に対してバルブ側口ッ ド 8に当接させる方向の力を付勢する駆動側スプリ ングである。 そして、 駆動側ロッ ド 1 1が引っ込んだ状態では、 駆動側スプリ ング 2 7の力に よりロー夕 2 5のネジ山 2 5 aに駆動側ロ ッ ド 1 1 のネジ山 1 1 aが当 接された状態になる。 また、 駆動側ロッ ド 1 1 のネジ山 1 1 aの倒壊当 接部位の反対側は所定のク リァランスにて離間する。  In the driving means 33, 5 is a stepping motor that rotates by an amount corresponding to the number of pulses described above, and 25 is a screw that rotates according to the rotational driving force of the stepping motor 5 and is adjacent in the direction of the rotation axis. The thread having a female thread in which the thread 25 a and the thread 25 a are spaced apart from each other, 11 is arranged in conformity with the thread 25 a of the thread 25 and In this case, the drive side rod having male threads in which the adjacent thread 11 1a and the thread 11 1a are separated from each other, and 27 is connected to the valve side port 8 with respect to the drive side rod 11 A drive-side spring that applies a force in the direction of contact. When the driving rod 11 is retracted, the driving spring 27 causes the screw 11 a of the driving rod 11 to hit the screw 25 a of the rotor 25. You will be in contact. In addition, the opposite side of the collapse contact portion of the thread 11a of the drive side rod 11 is separated by a predetermined clearance.
検出手段 6 において、 2 8は駆動側ロッ ド 1 1 の他端に一体的に固定 して配置されるとともに、 側面上に突起部 2 8 aが形成された検出用口 ッ ド、 2 9はこの検出用ロッ ド 2 8の移動範囲において突起部 2 8 a と 当接するように配接された抵抗板、 3 0はこの抵抗板 2 9の一端部に一 定の電圧を印加するとともに、 この電圧印加点と上記突起部 2 8 aの接 触点との間の所定の検出点の電圧レベル信号が入力される検出本体であ る。 そして、 検出用ロッ ド 2 8は駆動側スプリ ング 2 7や駆動側口ッ ド 1 1 を介して接地されているので、 この検出用ロッ ド 2 8が駆動側口ッ ド 1 1 とともに移動することにより検出点における抵抗分圧比率が変化 し、 これに応じて上記検出点の電圧レベルも増減する。 In the detection means 6, reference numeral 28 is integrally fixed to the other end of the driving rod 11 and the detection port having a projection 28a formed on the side surface. Reference numeral 29 denotes a detection port. In the moving range of the detection rod 28, a resistor plate 30 is disposed so as to abut on the protrusion 28a, and a constant voltage is applied to one end of the resistor plate 29, The detection main body receives a voltage level signal at a predetermined detection point between the voltage application point and the contact point of the protrusion 28a. Since the detection rod 28 is grounded through the drive spring 27 and the drive port 11, the detection rod 28 moves together with the drive port 11. Changes the resistance partial pressure ratio at the detection point Then, the voltage level at the detection point increases or decreases accordingly.
次に動作について説明する。  Next, the operation will be described.
第 5図から第 9図はこの発明の実施の形態 1 による駆動手段 3 3およ びその周辺部を示す一部拡大断面図である。 まず、 第 5図はバルブ側口 ッ ド 1 1から駆動側口ッ ド 8が離間した状態を示している。 駆動側スプ リ ング 2 7の力により駆動側ロッ ド 1 1 はバルブ側ロッ ド 8の方向に移 動しょう とするが、 同図のように、 ロー夕 2 5のネジ山 2 5 aの検出用 ロッ ド 2 8 に対向する面が駆動側ロッ ド 1 1 のネジ山 1 1 aに当接する ことにより離間状態に保持される。  FIGS. 5 to 9 are partially enlarged sectional views showing the driving means 33 and its peripheral portion according to the first embodiment of the present invention. First, FIG. 5 shows a state in which the drive side head 8 is separated from the valve side head 11. The drive spring 11 attempts to move in the direction of the valve rod 8 due to the force of the drive spring 27, but as shown in the figure, the thread 25 a of the rotor 25 is detected. The surface facing the application rod 28 is kept in a separated state by contacting the thread 11 a of the driving rod 11.
この第 5図に示す離間状態からステツ ピングモ一夕 5 にパルスを入力 すると、 第 6図に示すように、 駆動側ロッ ド 1 1がバルブ側ロッ ド 8 に 当接する。 この当接開始状態では、 ロー夕 2 5のネジ山 2 5 aは、 その 検出用ロッ ド 2 8 に対向する面が駆動側ロッ ド 1 1 のネジ山 1 1 aに当 接したままである。  When a pulse is input to the stepping motor 5 from the separated state shown in FIG. 5, the drive rod 11 comes into contact with the valve rod 8 as shown in FIG. In this abutting start state, the surface of the screw thread 25 a of the rope 25 that faces the detection rod 28 remains in contact with the screw thread 11 a of the driving rod 11. .
この第 6図に示す当接開始状態から更にステッピングモー夕 5にパル スを入力すると、 第 7図に示すように、 駆動側ロッ ド 1 1がバルブ側口 ッ ド 8 に当接したまま、 ロー夕 2 5のネジ山 2 5 aは駆動側ロッ ド 1 1 のネジ山 1 1 aから離間する。  When a pulse is further input to the stepping mode 5 from the contact start state shown in FIG. 6, as shown in FIG. 7, the drive rod 11 is kept in contact with the valve side port 8, and The thread 25 a of the row 25 is separated from the thread 11 a of the driving rod 11.
この第 7図に示す遷移状態から更にステツピングモ一夕 5にパルスを 入力すると、 第 8図に示すように、 駆動側ロッ ド 1 1がバルブ側ロッ ド 8に当接したまま、 ロー夕 2 5のネジ山 2 5 aはそのバルブ側ロッ ド 8 側の面が駆動側口ッ ド 1 1 のネジ山 1 1 aに当接する。  When a pulse is further input to the stepping motor 5 from the transition state shown in FIG. 7, as shown in FIG. 8, the driving rod 11 is kept in contact with the valve rod 8 and The surface of the valve side rod 8 side of the screw thread 25 a of the above contacts the screw thread 11 a of the drive side port 11.
この第 8図に示すバルブ開動作開始状態から更にステツピンダモー夕 5 にパルスを入力すると、 第 9 図に示すように、 ロー夕 2 5の回転量に 応じて駆動側ロッ ド 1 1 およびバルブ側ロッ ド 8が共に移動し、 バルブ 3が閉塞状態から開状態になる。 第 1 0図 （ a ) はこの発明の実施の形態 1 による駆動手段 3 3への入 力パルス数と検出手段の出力レベルとの対応関係を示す入力パルス数一 レベル対応図である。 図において、 横軸はステッ ピングモー夕 5へ入力 した入力パルス数であり、 縦軸は検出手段 6 における電圧レベル信号で ある。 そして、 ①は離間状態、 ②は当接開始状態、 ③は遷移状態、 ④は バルブ開動作開始状態、 ⑤はバルブ開状態である。 同図に示すように、 当接開始状態③からバルブ開動作開始状態④までの遷移状態③において はパルスを入力しても電圧レベル信号が変化しない特性となる。 また、 バルブ 3 とバルブハウジング本体 1 との間に排気ガスに含まれる塵など がつまつてバルブ 3が完全に閉じない状態が生じてしまう と、 それに応 じてバルブ側ロッ ド 8の戻り量が減るので、 そのようなバルブ 3 を駆動 する場合にはバルブ 3 を開く際の入力パルス数と電圧レベル信号との関 係特性は同図の破線に示す特性に変化し、 当接開始状態、 遷移状態、 バ ルブ開動作開始状態もそれぞれ②'、 ③'、 ④' に変化する。 When a pulse is further input to the stepper motor 5 from the valve opening operation start state shown in FIG. 8, as shown in FIG. The valve 8 moves together, and the valve 3 changes from the closed state to the open state. FIG. 10 (a) is an input pulse number-one level correspondence diagram showing a correspondence relationship between the number of input pulses to the driving means 33 and the output level of the detection means according to Embodiment 1 of the present invention. In the figure, the horizontal axis is the number of input pulses input to the stepping mode 5, and the vertical axis is the voltage level signal at the detection means 6. Then, ① is the separated state, ② is the contact start state, ③ is the transition state, ④ is the valve opening operation start state, and ⑤ is the valve open state. As shown in the figure, in the transition state ③ from the contact start state ③ to the valve opening operation start state ④, the voltage level signal does not change even if a pulse is input. In addition, if dust contained in exhaust gas is trapped between the valve 3 and the valve housing body 1 and the valve 3 is not completely closed, the return amount of the valve-side rod 8 is correspondingly increased. When such a valve 3 is driven, the relationship between the number of input pulses and the voltage level signal when the valve 3 is opened changes to the characteristic shown by the broken line in FIG. The transition state and the valve opening operation start state also change to ② ', ③', and ④ ', respectively.
また、 第 1 0図 （ b ) はこの発明の実施の形態 1 による排気ガス還流 装置への入力パルス数と弁開度との対応関係を示す駆動パルス数一弁開 度対応図である。 同図において、 横軸はステッ ピングモー夕 5 に入力す る駆動パルス数、 縦軸は弁開度 （バルブの移動量） である。 同図に示す ように、 バルブ 3が正常に閉塞される状態では同図の実線に示すような 弁開度特性が得られ、 バルブ 3が完全に閉じない状態では同図の一点鎖 線に示すような弁開度特性に変化する。  FIG. 10 (b) is a diagram showing the correspondence between the number of drive pulses and the valve opening, which indicates the correspondence between the number of input pulses to the exhaust gas recirculation device and the valve opening according to Embodiment 1 of the present invention. In the figure, the horizontal axis is the number of drive pulses input to stepping mode 5, and the vertical axis is the valve opening (valve movement). As shown in the figure, when the valve 3 is normally closed, the valve opening characteristic as shown by the solid line in the figure is obtained, and when the valve 3 is not completely closed, it is shown by the dashed line in the figure. It changes to such a valve opening characteristic.
そして、 制御手段 7は、 エンジン停止時などにおいては、 駆動側ロッ ド 1 1および検出用ロッ ド 2 8がバルブ 3から最も離間する位置まで戻 るように過剰なパルスをステツ ピングモ一夕 5 に供給するとともに、 次 回のバルブ制御を開始する際に検出本体 3 0の出力レベルに基づいてバ ルブが完全に密閉されていたか否かの判別を行う。 なお、 駆動側口ッ ド T/JP When the engine is stopped, the control means 7 sends an excessive pulse to the stepping motor 5 so that the driving rod 11 and the detecting rod 28 return to the position farthest from the valve 3. In addition to the supply, when starting the next valve control, it is determined whether or not the valve is completely sealed based on the output level of the detection main body 30. In addition, drive side door T / JP
12  12
1 1および検出用ロッ ド 2 8がバルブ 3から最も離間する位置まで戻す ためには、 その離間位置からバルブ全開となる位置までに供給すべきパ ルス数より も多いパルスを入力すれば良く、 例えば、 駆動側ロッ ド 1 1 のス トロークに対応するパルス数よりも多い数のパルスをステッピング モー夕 5に入力すればよい。 In order to return 1 and the detection rod 28 to the position farthest from the valve 3, it is sufficient to input more pulses than the number of pulses to be supplied from that position to the position where the valve is fully opened. For example, a larger number of pulses than the number of pulses corresponding to the stroke of the driving rod 11 may be input to the stepping mode 5.
第 1 1図はこの発明の実施の形態 1におけるバルブ完閉判別動作を示 すフローチヤ一トである。 このフローチヤ一 トは例えばステッピングモ 一夕駆動開始時などにおいて実行される。 図において、 S T 1は Nステ ップ時の検出手段 3 0の出力レベル L (N) を読み取る第一読取ステツ プであり、 S T 2は正常時には 1ステップ分パルスを入力するパルス駆 動ステップであり、 S T 3は正常時には遷移状態である （N + 1 ) ステ ップ時の検出手段 3 0の出力レベル L (N + 1 ) を読み取る第二読取ス テツプであり、 S T 4はこれら 2つの出力レベル差 （ I L (N) 一 L ( N + 1 ) I ) が所定の許容レベル差 X (例えばバルブ開状態における 1 ステップの出力レベルの変化量の 1ノ 3の値） より も小さいか否かを判 別する判別ステツプであり、 S T 5は出力レベル差が所定の許容レベル 差 X以上である場合には Nに N + 1 を代入し、 第一読取ステップ S T 1 に戻す検出ループステップであり、 S T 6は出力レベル差が所定の許容 レベル差 Xより も小さくなつたときの Nが所定の許容範囲以内 （A<X <B) に入っているか否かを判断する異常判定ステップであり、 S T 7 は Nが所定の許容範囲以内である場合に実行される着座位置正常処理ス テツプであり、 S T 6は Nが所定の許容範囲外である場合に実行される 着座位置異常処理ステップである。 これにより、 複数の移動量信号の出 カレベルの差の変化に基づいてバルブの全閉状態における異常判断を行 つて所定の処理を行う ことができる。 なお、 この例では Nステップ時の 出力レベル L (N) と （N + 1 ) ステップ時の出力レベル L (N + 1 ) とを比較して着座位置の検出を行ったが、 Nステップ時の出力レベル L ( N ) と （N— 1 ) ステップ時の出力レベル L ( N— 1 ) とを比較して 着座位置の検出を行ってもよい。 FIG. 11 is a flowchart showing an operation of determining whether the valve is completely closed according to the first embodiment of the present invention. This flowchart is executed, for example, at the start of the stepping mode overnight drive. In the figure, ST 1 is a first reading step for reading the output level L (N) of the detecting means 30 at the N step, and ST 2 is a pulse driving step for inputting a pulse for one step in a normal state. ST 3 is a transition state during normal operation. (N + 1) The second reading step for reading the output level L (N + 1) of the detecting means 30 at the time of the (N + 1) step. Whether or not the output level difference (IL (N) -L (N + 1) I) is smaller than a predetermined allowable level difference X (for example, a change in the output level in one step when the valve is open). ST 5 is a detection loop step for substituting N + 1 for N when the output level difference is equal to or greater than the predetermined allowable level difference X, and returning to the first reading step ST 1. ST 6 is where N is when the output level difference is smaller than the predetermined allowable level difference X. ST 7 is an abnormality judgment step for judging whether or not N is within a predetermined allowable range (A <X <B). ST 7 is a seating position normal processing step executed when N is within a predetermined allowable range. ST6 is a seating position abnormality processing step executed when N is outside a predetermined allowable range. Thus, a predetermined process can be performed by performing an abnormality determination in the fully closed state of the valve based on a change in the output level of the plurality of movement amount signals. In this example, the output level L (N) at the N step and the output level L (N + 1) at the (N + 1) step Is detected by comparing the output level L (N) at the N-step with the output level L (N-1) at the (N-1) step. May be performed.
以上のように、 この実施の形態 1 によれば、 ステッピングモー夕 5に は駆動側ロッ ド 1 1 を取り付けるとともに、 バルブ側ロッ ド 8にはバル ブを閉じる方向の力を作用させているので、 バルブ 3 を閉じる際にはバ ルブ側口ッ ド 8 に力を作用させない待避位置まで駆動側口ッ ド 1 1 を戻 すことにより、 バルブ側スプリ ング 1 0の力のみでバルブ 3 を密閉状態 に閉じることができる。  As described above, according to the first embodiment, the driving rod 11 is attached to the stepping motor 5 and the force in the valve closing direction is applied to the valve rod 8. When closing valve 3, return valve 11 to the retracted position where no force is applied to valve 8 so that valve 3 is sealed only with the force of valve spring 10. Can be closed to the state.
また、 ステツ ピングモ一夕 5の回転駆動力に応じてバルブ側口ッ ド 8 の軸方向を回転軸として回転するとともにネジ山 2 5 aを有するロー夕 2 5 と、 このロー夕のネジ山 2 5 a と所定のク リ アランスをもって当接 するネジ山 1 1 aが形成された駆動側ロッ ド 1 1 と、 駆動側ロッ ド 1 1 に対してバルブ側ロッ ド 8の方向にバルブ側スプリ ング 1 0 よりも小さ い力を付勢する駆動側スプリ ング 2 7 とでステッ ピングモータ 5の駆動 力をバルブ側ロッ ド 8 に伝達するように構成したので、 駆動側ロッ ド 1 1 の回転軸方向における移動量を検出して移動量信号を出力する検出手 段 6 と、 ステッ ピングモー夕 5 に対してパルスを入力するとともに、 こ のパルスの入力に応じて変化する移動量信号に基づいてバルブ 3の状態 を検出する制御手段 7 とを設けることにより、 バルブ 3の開度を精度良 く確実に検知して制御することができる。  In addition, according to the rotational driving force of the stepping motor 5, the rotary shaft 25 rotates about the axial direction of the valve side port 8 as a rotation axis and has a screw thread 25 a. Drive side rod 11 formed with thread 11 1a that abuts with 5a with a specified clearance, and valve side spring in the direction of valve side rod 8 with respect to drive side rod 11 Since the driving force of the stepping motor 5 is transmitted to the valve-side rod 8 with the driving-side spring 27 that applies a force smaller than 10, the rotation axis of the driving-side rod 11 A pulse is input to the detection means 6 that detects the amount of movement in the direction and outputs a movement amount signal, and a pulse is input to the stepping motor 5, and a valve is provided based on the movement amount signal that changes according to the input of the pulse. Control means 7 for detecting the state of 3 With this arrangement, the opening of the valve 3 can be accurately detected and controlled accurately.
この実施の形態 1 によれば、 制御手段 7力 ステッピングモ一夕 5の 駆動開始時には、 各パルスを入力する度にそのパルス入力の前後におけ る移動量信号の変化量を検出し、 その変化量が変化するタイ ミングに基 づいてバルブ 3の停止位置を判断するので、 例えばバルブ 3 とハウジン グ 1 との間に排気ガスの煤などがつまってしまつてバルブ 3が完全に閉 まらないなどの異常状態が発生した場合には、 それによるバルブ 3の全 閉状態の異常を判断することができる。 According to the first embodiment, at the start of driving of the control means 7 force stepping motor 5, each time a pulse is input, a change amount of a movement amount signal before and after the pulse input is detected, and the change amount is detected. The stop position of valve 3 is determined based on the timing at which valve 3 changes, so valve 3 is completely closed, for example, when exhaust gas soot is clogged between valve 3 and housing 1. If an abnormal state such as not turning occurs, it is possible to determine whether the valve 3 is in a fully closed state due to the abnormal state.
この実施の形態 1 によれば、 駆動手段 （駆動装置） に、 ステッピング モー夕 5 と、 上記ステッ ピングモー夕 5 の回転駆動力に応じて上記バル ブ側ロッ ド 8の軸方向を回転軸として回転するとともにネジ山 2 5 aを 有するロー夕 2 5 と、 このロー夕のネジ山 2 5 a と所定のク リアランス をもって当接するネジ山 1 1 aが形成された駆動側ロッ ド 1 1 と、 上記 駆動側口ッ ド 1 1 に対して上記バルブ側口ッ ド 8の方向に上記バルブ側 スプリ ング 1 0より も小さい力を付勢する駆動側スプリ ング 2 7 とを備 えることにより、 駆動ロッ ド 1 1がバルブロッ ド 8 と当接した状態にお いては、 ステツ ピングモ一夕 5 にパルスを入力しても駆動側ロッ ド 1 1 が移動しなくなるので、 その駆動側ロッ ド 1 1 の移動状態の変化を把握 することにより、 着座位置を認識することができる。  According to the first embodiment, the driving means (driving device) is provided with the stepping motor 5 and the rotation of the axis of the valve-side rod 8 according to the rotational driving force of the stepping motor 5. And a drive rod 11 formed with a screw thread 11a that is in contact with this screw thread 25a with a predetermined clearance. By providing a drive spring 27 that urges a smaller force than the valve spring 10 in the direction of the valve head 8 with respect to the drive head 11 in the direction of the valve head 8, the drive lock is provided. When the drive rod 11 is in contact with the valve rod 8, the drive rod 11 does not move even if a pulse is input to the stepper module 5, so that the drive rod 11 moves. By grasping the change in status, Position can be recognized.
なお、 このような構成であれば、 駆動手段 3 3のバルブハウジング本 体 1 に対する取り付け精度が悪くても、 その取付誤差を駆動口ッ ド 1 1 とバルブロッ ド 8 との間のク リアランスや、 ロー夕 2 5および駆動側口 ッ ド 1 1 に形成するネジ山 （ 2 5 a同士， 1 1 a同士） の間隔を調整す ることにより吸収することができる。 産業上の利用可能性  With such a configuration, even if the mounting accuracy of the driving means 33 to the valve housing body 1 is poor, the mounting error is reduced by the clearance between the driving port 11 and the valve rod 8, It can be absorbed by adjusting the distance between the screw threads (25a, 11a) formed on the rotor 25 and the drive side port 11. Industrial applicability
以上のように、 この発明に係るバルブ装置および駆動装置は、 内燃機 関の排気ガス還流装置などにおいて、 不要な排気ガスの還流によるェン ジン出力の低下などを来さないようにしつつ、 精度良く排気ガスの還流 量を制御する場合などに適している。  As described above, the valve device and the drive device according to the present invention can be used with high accuracy in an exhaust gas recirculation device or the like of an internal combustion engine while preventing the engine output from being reduced due to unnecessary exhaust gas recirculation. It is suitable for controlling the amount of exhaust gas recirculation.

Claims

請 求 の 範 囲 The scope of the claims
1 . バルブハウジング、 上記バルブハウジングを貫通するように形成さ れた貫通路、 上記貫通路内に配設されたバルブ、 上記バルブが固定され たバルブ側ロッ ド、 バルブ側口ッ ドに対してバルブを閉じる方向の力を 作用させるバルブ側スプリ ングを有するバルブ本体と、 1. With respect to the valve housing, a through passage formed through the valve housing, a valve disposed in the through passage, a valve-side rod to which the valve is fixed, and a valve-side head. A valve body having a valve-side spring for applying a force in a direction to close the valve;
上記バルブハウジングに取り付けられるステッピングモー夕、 上記ス テツ ピングモ一夕の回転駆動力に応じて上記バルブ側口ッ ドの軸方向を 回転軸として回転するとともにネジ山を有するロー夕、 このロー夕のネ ジ山と所定のク リアランスをもって当接するネジ山が形成された駆動側 ロッ ド、 上記駆動側ロッ ドに対して上記バルブ側ロッ ドの方向に上記バ ルブ側スプリ ングより も小さい力を付勢する駆動側スプリ ングを有する 駆動手段と、  A stepping motor attached to the valve housing, a roller having a screw thread and rotating around the axial direction of the valve side port according to the rotational driving force of the stepping motor, A drive-side rod formed with a thread that comes into contact with a thread with a predetermined clearance. A smaller force than the valve-side spring is applied to the drive-side rod in the direction of the valve-side rod. A driving means having a driving side spring for energizing;
上記駆動側ロッ ドの上記回転軸方向における移動量を検出して移動量 信号を出力する検出手段と、  Detecting means for detecting a movement amount of the drive side rod in the rotation axis direction and outputting a movement amount signal;
上記ステッ ピングモー夕に対してパルスを入力するとともに、 このパ ルスの入力に応じて変化する移動量信号に基づいてバルブの状態を検出 する制御手段とを備えたバルブ装置。  A valve device comprising: a pulse input to the stepping motor; and control means for detecting a state of the valve based on a movement amount signal that changes according to the input of the pulse.
2 . 制御手段は、 ステッ ピングモー夕駆動開始時には、 各パルスを入力 する度にそのパルス入力の前後における移動量信号の変化量を検出し、 その変化量が変化するタイ ミ ングに基づいてバルブの停止位置を判断す ることを特徴とする請求の範囲第 1項記載のバルブ装置。 2. At the start of the stepping motor drive, the control means detects the amount of change in the movement signal before and after each pulse input each time a pulse is input, and based on the timing at which the amount of change changes, determines whether the valve is in operation. The valve device according to claim 1, wherein the stop position is determined.
3 . ステッピングモー夕と、 上記ステッ ピングモー夕の回転駆動力に応 じて上記バルブ側ロッ ドの軸方向を回転軸として回転するとともにネジ 山を有するロー夕と、 このロー夕のネジ山と所定のク リアランスをもつ て当接するネジ山が形成された駆動側ロッ ドと、 上記駆動側ロッ ドに対 して上記バルブ側口ッ ドの方向に上記バルブ側スプリ ングょりも小さい 力を付勢する駆動側スプリ ングとを備えた駆動装置。 3. In accordance with the stepping motor and the rotation driving force of the above stepping motor, the valve side rod rotates in the axis direction as the rotation axis, and the screw rotates. A drive rod having a thread, a drive rod formed with a screw thread which comes into contact with the screw thread of the rotor with a predetermined clearance, and a valve side port with respect to the drive rod. And a drive-side spring that urges the valve-side spring with a smaller force in the direction of.
PCT/JP1998/002395 1998-05-29 1998-05-29 Valving device and drive unit WO1999063256A1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001012633A (en) * 1999-06-29 2001-01-16 Fuji Koki Corp Device for detecting valve opening of motor-driven valve and device for controlling opening of motor-driven valve
JP2010285953A (en) * 2009-06-12 2010-12-24 Isuzu Motors Ltd Motor controlling device and egr valve controlling device
JP2011503469A (en) * 2007-11-07 2011-01-27 キョントン ネットワーク カンパニー リミテッド Flow control valve
US9500162B2 (en) 2012-08-02 2016-11-22 Denso Corporation Valve apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0650217A (en) * 1991-01-22 1994-02-22 Taiho Kogyo Co Ltd Exhaust reflux control valve
JPH07332168A (en) * 1994-06-03 1995-12-22 Mitsubishi Denki Eng Kk Flow rate valve control device and manufacture of flow rate valve
JPH1054474A (en) * 1996-08-09 1998-02-24 Denso Corp Exhaust gas recirculation valve

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0650217A (en) * 1991-01-22 1994-02-22 Taiho Kogyo Co Ltd Exhaust reflux control valve
JPH07332168A (en) * 1994-06-03 1995-12-22 Mitsubishi Denki Eng Kk Flow rate valve control device and manufacture of flow rate valve
JPH1054474A (en) * 1996-08-09 1998-02-24 Denso Corp Exhaust gas recirculation valve

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001012633A (en) * 1999-06-29 2001-01-16 Fuji Koki Corp Device for detecting valve opening of motor-driven valve and device for controlling opening of motor-driven valve
JP2011503469A (en) * 2007-11-07 2011-01-27 キョントン ネットワーク カンパニー リミテッド Flow control valve
JP2010285953A (en) * 2009-06-12 2010-12-24 Isuzu Motors Ltd Motor controlling device and egr valve controlling device
US9500162B2 (en) 2012-08-02 2016-11-22 Denso Corporation Valve apparatus

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