WO2010013372A1 - バルブ制御装置及びバルブ装置 - Google Patents
バルブ制御装置及びバルブ装置 Download PDFInfo
- Publication number
- WO2010013372A1 WO2010013372A1 PCT/JP2009/002068 JP2009002068W WO2010013372A1 WO 2010013372 A1 WO2010013372 A1 WO 2010013372A1 JP 2009002068 W JP2009002068 W JP 2009002068W WO 2010013372 A1 WO2010013372 A1 WO 2010013372A1
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- WIPO (PCT)
- Prior art keywords
- valve
- drive
- unit
- opening position
- shaft
- Prior art date
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- 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
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- 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
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- 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
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- 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
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- 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
- F16K31/046—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor with electric means, e.g. electric switches, to control the motor or to control a clutch between the valve and the motor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7758—Pilot or servo controlled
- Y10T137/7761—Electrically actuated valve
Definitions
- the present invention relates to a valve control device that controls a valve opening degree such as an EGR (Exhaust Gas Recirculation) valve for a vehicle, and a valve device including the valve control device.
- a valve control device that controls a valve opening degree such as an EGR (Exhaust Gas Recirculation) valve for a vehicle
- a valve device including the valve control device.
- the vehicle engine is provided with an EGR valve that opens and closes the exhaust gas recirculation passage.
- This EGR valve is composed of a valve portion and a motor as its actuator, and generally the valve shaft and the motor shaft of the motor are separated.
- the opening operation of the valve is performed by pressing the motor shaft against the valve shaft and moving the valve body at the end of the valve shaft from the valve seat in the opening direction. Further, the closing operation of the valve is performed by transmitting the urging force of the spring to the valve body through the valve shaft.
- the motor stopper position where the rotor cannot rotate when the motor shaft hits the stopper is detected by the retracting operation of the motor shaft. Then, the rotor is rotated in the valve opening direction from the motor stopper position by the pushing operation of the motor shaft, and the position where the motor shaft contacts the valve shaft is detected as the valve opening start position.
- Patent Document 1 As a conventional valve control device for controlling the valve opening degree of a valve device having a configuration in which a motor and a valve are not directly connected, there is one disclosed in Patent Document 1, for example.
- the motor control signal command duty ratio or motor current
- the motor control signal once integrated is proportional to the motor speed, and if this motor speed is integrated, a value proportional to the motor position is obtained.
- the speed and the motor position are estimated, and the command opening or the motor control signal is corrected according to the estimated motor speed or the motor position.
- valve opening start position is detected by pulling the valve shaft to the side and pressing the valve body against the valve seat (valve housing).
- the valve body may be strongly pressed against the valve housing when seated, and the impact may damage the valve. Further, if the fully closed state (the state in which the valve body is pressed against the valve housing) is continued for a long time, the motor drive duty ratio becomes high, and there is a possibility that the motor generates heat or malfunctions.
- the EGR valve in which the motor shaft and the valve shaft are integrated in the axial direction is different from the structure in which the valve shaft and the motor shaft of the motor are separated from each other, and the force with which the rotor Assy is drawn into the housing side when the valve is closed is large. . For this reason, if a large load is applied to the wave washer supporting the bearing bearing of the motor and the opening / closing operation of the valve is repeated, the wave washer may be fatigued and damaged.
- the present invention has been made in order to solve the above-described problems.
- a valve device in which a motor shaft and a valve shaft are integrated in the axial direction, an impact when a valve body is seated is reduced, and a motor is provided.
- An object of the present invention is to obtain a valve control device capable of controlling the drive duty ratio to be equal to or less than a predetermined load, and a valve device including the valve control device.
- the valve control device is configured by integrating a drive unit, a drive shaft directly moved by the drive unit, and a valve shaft in the axial direction, and linearly moves in the axial direction by the driving force of the drive unit.
- the valve control device that controls the opening and closing of the valve device including the integral structure shaft that opens and closes the valve body with respect to the valve seat provided in the valve housing the valve device is actually opened by the direct movement of the integral structure shaft.
- a drive control unit that feedback-controls the opening position of the valve device so that the degree position approaches the target opening position, and when receiving a full-close command, the drive control unit sets a fixed soft landing start target position to the target opening degree.
- the target opening position gradually subtracting the grayed start target position is intended and a fully closed state determining unit to be set in the drive control unit.
- a constant soft landing start target position is set as a target opening position in the drive control unit of the valve device, and the actual opening position and the soft landing by direct movement of the integral structure shaft are set.
- the target opening position obtained by gradually subtracting the soft landing start target position is set in the drive control unit.
- FIG. 1 It is sectional drawing of the EGR valve
- FIG. It is a figure for demonstrating the valve opening start position learning by the valve control apparatus in FIG.
- FIG. 1 is a sectional view of an EGR valve (valve device) 1 according to Embodiment 1 of the present invention, showing an EGR valve having a structure in which a valve shaft and a motor shaft are completely fastened and integrated in the axial direction.
- the valve housing 5 of the EGR valve 1 is provided with a DC motor (driving unit) 2 serving as a valve actuator.
- the motor shaft and the valve shaft of the DC motor 2 have a shaft (integrated structure shaft) 3 formed integrally in the axial direction.
- An exhaust gas passage through which exhaust gas passes is formed in the valve housing 5, and an outlet passage 6 is formed in the exhaust gas passage.
- a valve seat 7 is formed between the exhaust gas passage in the valve housing 5 and the outlet passage 6.
- the valve body 8 is provided so as to be seated on the valve seat 7 by pulling the shaft 3 to the DC motor 2 side, and away from the valve seat 7 by pushing the shaft 3 to the valve housing 5 side. It attaches to the shaft 3 by such as.
- the shaft 3 is supported on the upper side of the outlet passage 6 so as to be slidable in the axial direction by a bearing 12 assembled to the valve housing 5.
- a spring 9 is provided between the valve housing 5 and the shaft 3. The lower end of the spring 9 is supported by the spring receiving portion 10 of the valve housing 5. On the other hand, the upper end of the spring 9 is in contact with the spring holder 11.
- a position sensor (opening position sensor, drive control unit) 4 is provided on the upper part of the DC motor 2.
- the position sensor 4 is an EGR opening sensor that detects an actual opening position (EGR opening (%)), and a voltage corresponding to the moving position of the shaft 3 of the DC motor 2 is applied to the valve body 8 of the EGR valve 1.
- An EGR opening degree detection signal indicating the position is output to a valve control device to be described later with reference to FIG.
- the EGR valve 1 of this invention is the structure which the shaft 3 integrally molded the motor shaft and the valve shaft as mentioned above, by detecting the actual opening position of the shaft 3 with the position sensor 4, The open / closed state of the valve body 8 can be accurately grasped.
- FIG. 2 is a diagram showing the configuration of the valve control device 16 according to the first embodiment, and shows the connection relationship between the DC motor 2 and the position sensor 4 on the EGR valve 1 side.
- the valve control device 16 includes a target opening correction unit (drive control unit) 17, a subtracter (drive control unit) 17a, a fully closed state determination unit 18, a memory 19, a PID circuit 20, a duty limiting unit (duty).
- a drive controller that controls the driving of the DC motor 2 is configured by the target opening correction unit 17, the subtractor 17a, the PID circuit 20, the driver 22, and the A / D converter 23. Is done.
- the target opening degree correction unit 17 inputs the target opening position and corrects the target opening position so that it matches the opening position input from the fully closed state determination unit 18.
- the fully closed state determination unit 18 When the fully closed state determination unit 18 receives the control signal of the fully closed command in response to the learning request (initialization start command) of the valve opening start position, it outputs the soft landing start target position read from the memory 19 to the target opening correction unit 17.
- the output of the position sensor 4 is read via the A / D converter 23, and the difference between the actual opening position detected by the position sensor 4 and the soft landing start target position is equal to or less than the soft landing start deviation, and
- the opening position set in the target opening correction unit 17 is gradually subtracted at a predetermined rate. In this way, the shaft 3 is not pulled suddenly during the fully closed operation, and the valve body 8 is softly landed on the valve seat 7.
- the fully closed state determination unit 18 calculates the difference between the current actual opening position detected by the position sensor 4 and the previous actual opening position (before one sampling) below a predetermined value and is calculated by the PID circuit 20.
- the average value of the detection signal voltage of the position sensor 4 for a predetermined time is calculated, and the position indicated by the average value is newly opened. Set as a learning value for the position.
- the fully closed state determination unit 18 detects the target opening position corrected by the target opening correction unit 17 by the position sensor 4 when the EGR valve 1 is in the fully closed state, and does not require a learning of the valve opening start position.
- the actual opening position is below the predetermined position from the fully closed position (valve opening start position), and the drive duty ratio input from the PID circuit 20 is below the duty limit value.
- an energization cutoff command is transmitted to the duty restriction unit 21.
- the memory 19 stores a soft landing start target position, a soft landing start deviation, and a duty ratio limit value.
- the soft landing start target position is a target opening position at which a soft landing operation for slowly seating the valve body 8 on the valve seat 7 and starting the soft landing operation is started.
- the soft landing start deviation is a difference between the target opening position and the actual opening position during the soft landing operation.
- the duty limit value is an upper limit value of the drive duty ratio used when determining whether to interrupt the energization of the DC motor 2.
- the PID circuit 20 calculates a PI control amount according to the deviation between the target opening position and the actual opening position, calculates a drive duty ratio based on the PI control amount, and uses this drive duty ratio as a PWM control signal to limit the duty. This is given to the driver 22 via the unit 21.
- the driver 22 turns on and off the voltage applied to the DC motor 2 in accordance with the PWM control signal at a predetermined cycle, and the PWM signal in accordance with the ratio of on time to off time per cycle (drive duty ratio: PWM control signal). To control the voltage applied to the DC motor 2.
- the duty limiting unit 21 outputs a PWM control signal indicating the driving duty ratio input from the PID circuit 20 to the driver 22 and, upon receiving an energization cutoff command from the fully closed state determination unit 18, outputs the PWM control signal to the driver 22.
- the output is stopped and the energization to the DC motor 2 is interrupted.
- the A / D converter 23 converts the detection signal fed back from the position sensor 4 into a digital signal.
- the subtractor 17a inputs a detection signal indicating the actual opening position from the position sensor 4 via the A / D converter 23, and inputs a digital signal indicating the target opening position from the target opening correction unit 17, These differences are taken and output to the PID circuit 20 as a deviation between the target opening position and the actual opening position.
- FIG. 3 is a diagram for explaining the valve opening start position learning by the valve control device 16 in FIG. 2, and the upper graph shows the relationship between the target opening position and the actual opening position at the time of valve opening start position learning.
- the lower graph shows the change in the drive duty ratio when the DC motor is driven in the upper relationship.
- the opening (%) on the vertical axis of the upper graph indicates the opening position (EGR opening (%)), and the target opening position (target opening waveform) is determined by the target opening correction unit 17.
- the opening position is corrected so as to coincide with the opening position input from the fully closed state determination unit 18, and the actual opening position (actual opening waveform) is the actual opening position detected by the position sensor 4. is there.
- the position of the opening degree 0 (%) indicates the closing position (previous learning position) of the EGR valve 1, and the positive range is the opening position when the EGR valve 1 is open, and the negative range. Indicates the opening position (position of the shaft 3) after the EGR valve 1 is closed.
- Duty (%) in the lower graph of FIG. 3 is a drive duty ratio calculated by the PID circuit 20.
- the positive range is the drive duty ratio when the EGR valve 1 is opened
- the negative range is the drive duty ratio after the EGR valve 1 is closed.
- the valve control device 16 learns the valve opening start position (fully closed position) along the three-stage sequences (1) to (3) shown in FIG. (A) Sequence (1)
- the target position correction unit 17 sets the soft landing start target position read from the memory 19. Output to.
- the target opening correction unit 17 corrects the target opening position so as to coincide with the soft landing start target position input from the fully closed state determination unit 18. As a result, the target opening position is set to a constant soft landing start target position.
- the valve opening start position is shifted every time the learning is performed, and the same position is not necessarily the valve opening start position. For this reason, when the position learned last time is lower than the actual valve closing position, the opening / closing operation is controlled based on this position, and the possibility that the valve body 8 is suddenly seated on the valve seat 7 increases. For this reason, the soft landing start target position is a position away from the previous learning value beyond the detection error range of the opening position when learning the valve opening start position (fully closed position) in consideration of the learning position error.
- the error in the learning position is caused by the influence of the bite of deposit (foreign matter), the deviation of the zero point due to secular change, the thermal expansion of the valve itself, the valve inherent error, the temperature drift of the output voltage of the position sensor 4 and the like.
- the influence of the temperature drift of the output voltage of the position sensor 4 is the largest, and the difference between the actual valve closing position and the learning position is shifted by about 5 (%) at the maximum. Therefore, the soft landing start target position is set to a position equal to or more than the above-mentioned error expected due to temperature drift.
- a value obtained by adding an error of 5 (%), which is expected as a temperature drift of the output voltage of the position sensor 4, to the previously learned valve closing position (circled in FIG. 3). Opening degree 5 (%)) is adopted.
- the valve control device 16 When the target opening position is set to the soft landing start target position, the valve control device 16 performs the valve closing operation of the EGR valve 1 aiming at the soft landing start target position by feeding back a detection signal from the position sensor 4. Control. At this time, the fully closed state determination unit 18 reads the output of the position sensor 4 via the A / D converter 23, reads the soft landing start deviation from the memory 19, and the actual opening position detected by the position sensor 4. It is determined whether or not the difference from the soft landing start target position is less than or equal to the soft landing start deviation. Here, if the difference between the actual opening position and the soft landing start target position exceeds the soft landing start deviation, the valve closing operation of the EGR valve 1 aimed at the soft landing start target position is continued.
- the soft landing start deviation (first threshold) is set to a value that is greater than the error between the actual opening position and the learning position due to temperature drift of the output voltage of the position sensor 4 as described above. For example, when the difference between the actual valve closing position and the learning position is shifted by about 5% at the maximum due to the temperature drift of the output voltage of the position sensor 4, the soft landing start deviation is a value that is equal to or more than the above-mentioned error expected due to the temperature drift. And In the example shown in FIG. 3, a value obtained by adding an error of 5 (%) that is expected as a temperature drift of the output voltage of the position sensor 4 to the soft landing start target position (opening degree 5 (%)) (opening degree 10 (%)).
- the fully closed state determination unit 18 A predetermined waiting time is measured by a timer (not shown). This standby time is a period provided to bring the actual opening position sufficiently close to the previous learning position (opening 0 (%)), and can be arbitrarily set. In the example of FIG. 3, it is set to 160 (ms).
- the standby time has elapsed, the fully closed state determination unit 18 proceeds to sequence (2).
- the waiting time may not be provided, and when the difference between the actual opening position and the soft landing start target position exceeds the soft landing start deviation, the sequence (2) may be shifted to start the soft landing operation.
- (B) Sequence (2) The fully closed state determination unit 18 starts a soft landing operation when the standby time has elapsed, and gradually sets the opening position set in the target opening correction unit 17 at a predetermined rate until the predetermined opening degree position is reached. Subtract.
- the predetermined target opening position is a value that takes into account the error factor in the valve opening start position learning as described above, and the opening degree ⁇ 30 (%) is adopted in FIG.
- the opening position is subtracted from the soft landing start target position to the predetermined target opening position (opening ⁇ 30 (%)) at a rate of 100 (%) per second.
- the fully closed state determination unit 18 sequentially accumulates the actual opening position detected by the position sensor 4 in the memory 19, and the current actual opening position detected by the position sensor 4 and the previous (1 It is determined whether or not the difference between the actual opening position before sampling) is equal to or less than a predetermined value, and a state where the drive duty ratio calculated by the PID circuit 20 is equal to or less than the predetermined value continues for a predetermined standby period.
- the predetermined value for the difference between the current and previous actual opening positions is a value that takes into account the detection error of the actual opening position due to temperature drift of the output voltage of the position sensor 4 or the like. In the example of FIG. 3, 5 (%) expected as a temperature drift of the output voltage of the position sensor 4 is adopted.
- the DC motor 2 is feedback-controlled even when the actual opening position becomes the actual fully closed position, and the drive duty ratio increases. Therefore, as the predetermined value of the drive duty ratio, for example, an upper limit value of the drive duty ratio that allows heat generation of the DC motor 2 due to an increase in the drive duty ratio determined by specifications or experiments of the DC motor 2 is set.
- This predetermined value is a negative value because it is the drive duty ratio in the valve-closed state, and in the example of the lower graph in FIG. 3, the drive duty ratio is ⁇ 60 (%).
- the fully closed state determination unit 18 monitors whether or not the drive duty ratio is -60 (%) or less, that is, whether or not the drive duty ratio has increased to the negative side.
- the predetermined waiting period is a period provided to bring the actual opening position sufficiently close to the actual fully closed position, and can be arbitrarily set. In the example of FIG. 3, it is set to 160 (ms).
- the fully closed state determination unit 18 proceeds to sequence (3).
- (C) Sequence (3) When the standby time elapses, the fully closed state determination unit 18 calculates an average value of the detection signal voltages of the position sensor 4 over a certain period of time, and sets the position represented by the average value as a learned value of a new valve opening start position. Set as. For example, a position represented by an average value of detection signal voltages of the position sensor 4 for 1 second is set as a new valve opening start position.
- FIG. 4 is a diagram for explaining the drive duty ratio limiting process in the fully closed state by the valve control device 16 in FIG. 2, and the upper graph shows the target opening position and actual opening at the time of learning the valve opening start position.
- the lower graph shows the change in the drive duty ratio when the DC motor is driven in the upper relationship.
- the conditions for obtaining the results of FIG. 4 are the same as those of FIG.
- the procedure until the valve is closed is basically the same as the procedure for learning the valve opening start position described above.
- the waiting time for starting the soft landing operation is the same as that for learning the valve opening start position.
- the target opening position subtracted from the soft landing start target position is shorter than that in the case of the valve opening start position learning, and the shaft 3 is not moved to the minus side (valve closing side from the valve opening start position learning). ). This is because the fully closed position is determined by learning the valve opening start position, and the shaft 3 only needs to be slightly retracted from the fully closed position.
- the standby time when starting the soft landing operation is 64 (ms), and the target opening position to be subtracted from the soft landing start target position is -6 (%). Note that the soft landing operation may be started when the difference between the actual opening position and the soft landing start target position exceeds the soft landing start deviation without providing this waiting time.
- the fully closed state determination unit 18 transmits an energization cut-off command to the duty limiting unit 21, and the DC motor Shut off the power to 2.
- A There is no learning request for the valve opening start position.
- B The target opening position is below the current actual opening position.
- C The actual opening position is within a predetermined value from the fully closed position (valve opening start position). In the example of FIG. 4, 5 (%) expected as a temperature drift of the output voltage of the position sensor 4 is adopted.
- D The drive duty ratio is below the duty limit value.
- the duty limit value shown in FIG. 4 is set to a drive duty ratio of ⁇ 60 (%) (second threshold value) as in FIG.
- the duty limit value sets an upper limit value of the drive duty ratio that allows heat generation of the DC motor 2 due to an increase in the drive duty ratio determined by, for example, specifications of the DC motor 2 or experiments.
- the states (a) to (d) are continuously continued for a predetermined period (first waiting period). This predetermined period is the time required for the EGR valve 1 to close sufficiently, that is, the time required for slightly pressing the valve body 8 from the fully closed position to the valve seat 7 so that there is no leakage, and the DC motor 2 generates heat. This is a time that does not break, and is 800 (ms) in the example of FIG.
- the DC motor 2 may be melted. Therefore, it is necessary to set a time during which the DC motor 2 is not damaged due to heat generation for the reason described above in the predetermined period for determining whether to turn off the current in the condition (e). For example, a thermistor is attached to the DC motor 2, and the temperature of the DC motor 2 measured by the thermistor exceeds a certain value (for example, a temperature at which melting occurs) for a time longer than the time when the EGR valve 1 is sufficiently closed. Set a time less than the time.
- a temperature prediction model of the temperature of the DC motor 2 is created in advance by experiment, and a value that is less than the time when the temperature estimated by this prediction model exceeds the above-mentioned fixed value is set. You may make it set.
- valve opening start position learning is basically executed only once when the vehicle engine is started, and since the number of executions is small, it is not necessary to cut off the energization of the DC motor 2.
- FIG. 5 is a cross-sectional view of the DC motor 2 that drives the EGR valve 1 according to Embodiment 1 cut in the axial direction.
- the DC motor 2 shown in FIG. 5 is a brushless motor, and a cylindrical rotor Assy (rotor) 24 screwed to the shaft 3 is inserted into a hollow portion of a stator 26 fixed to a case 25, and a bearing 27 Is rotatably supported by.
- a magnetic pole position detection magnet (opening position sensor) 28 is fixed to the rotor assembly 24 so as to be a surface perpendicular to the axis.
- a Hall IC (opening position sensor) 30 is mounted on the printed circuit board (opening position sensor) 29.
- the Hall IC 30 is composed of an integrated circuit (IC) in which a Hall element is incorporated.
- the printed circuit board 29 is attached to the case 25 so that the Hall IC 30 faces the magnetic pole position detection magnet 28.
- the shaft 3 screwed into the rotor assembly 24 is movable in the axial direction (vertical direction in FIG. 5) by the rotation of the rotor assembly 24.
- the position of the bearing 27 for the bearing of the rotor assembly 24 is held by a wave washer (leaf spring, holding member) 31.
- a wave washer leaf spring, holding member
- control is performed so that the drive duty ratio does not exceed a predetermined value so that a load exceeding the set load of the holding member that supports the bearing 27 is not applied.
- the upper limit value of the drive duty ratio corresponding to the set load of the holding member is set in the duty limiter 21, and the duty limiter 21 exceeds this upper limit value among the drive duty ratios input from the PID circuit 20. Only the values in the non-existing range are output to the driver 22. By limiting the drive duty ratio in this way, it is possible to prevent the holding member from being damaged.
- the drive duty ratio is the upper limit value of the drive duty ratio corresponding to the set load of the wave washer 31. Control not to exceed.
- a fixed soft landing start target position is set as the target opening position for the drive control unit that feedback controls the drive of the DC motor 2. Then, at the timing when the difference between the actual opening position due to the linear movement of the shaft 3 and the soft landing start target position becomes the first threshold, the target opening position obtained by gradually subtracting the soft landing start target position is controlled by the above drive control. Set the part. By doing in this way, the impact at the time of seating of the valve body 8 can be reduced in the EGR valve 1 having the shaft 3 in which the motor shaft and the valve shaft are integrated in the axial direction.
- valve control device when the valve control device according to the present invention receives a full-close command in order to reduce the impact when the valve body is seated and to control the drive so that the drive duty ratio of the motor is a predetermined load or less.
- a fixed soft landing start target position is set as the target opening position in the drive control unit, and the difference between the actual opening position and the soft landing start target position due to the linear movement of the integral structure shaft becomes the first threshold value.
- the valve control device for controlling the valve opening of an EGR valve or the like of an automobile is provided with the fully closed state determining unit that sets the target opening position obtained by gradually subtracting the soft landing start target position in the drive control unit. Suitable for use in
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- General Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Abstract
Description
実施の形態1.
図1は、この発明の実施の形態1によるEGRバルブ(バルブ装置)1の断面図であり、バルブシャフトとモータシャフトとを完全に締結して軸方向に一体化した構造のEGRバルブを示している。図1において、EGRバルブ1のバルブハウジング5には、バルブのアクチュエータとなるDCモータ(駆動部)2が設けられている。また、DCモータ2のモータシャフトとバルブシャフトとが軸方向に一体成型されたシャフト(一体構造シャフト)3を有する。バルブハウジング5には、排気ガスを通す排気ガス通路が形成されており、この排気ガス通路に出口通路6が形成される。バルブハウジング5内の排気ガス通路と出口通路6との間に弁座7が形成される。
(1)開弁開始位置学習(イニシャライズ)
図3は、図2中のバルブ制御装置16による開弁開始位置学習を説明するための図であり、上段のグラフが開弁開始位置学習時における目標開度位置と実開度位置との関係を示しており、下段のグラフが上段の関係でDCモータを駆動させた際の駆動デューティ比の変化を示している。上段のグラフの縦軸の開度(%)は、開度位置(EGR開度(%))を示しており、目標開度位置(目標開度波形)は、目標開度補正部17によって、全閉状態判定部18から入力した開度位置と一致するように補正された開度位置であり、実開度位置(実開度波形)は、ポジションセンサ4で検出された実開度位置である。
(A)シーケンス(1)
先ず、全閉状態判定部18は、開弁開始位置の学習要求(イニシャライズ開始指令)によって全閉指令の制御信号を受けると、メモリ19から読み出したソフトランディング開始目標位置を目標開度補正部17へ出力する。目標開度補正部17は、全閉状態判定部18から入力したソフトランディング開始目標位置と一致するように目標開度位置を補正する。これにより、目標開度位置が一定のソフトランディング開始目標位置に設定される。
全閉状態判定部18は、上記待機時間が経過するとソフトランディング動作を開始し、目標開度補正部17に設定する開度位置を、所定の目標開度位置になるまで所定の割合で徐々に減算する。上記所定の目標開度位置は、上述したような開弁開始位置学習における誤差要因を考慮した値とし、図3では開度-30(%)を採用している。また、1秒間に100(%)の割合で、ソフトランディング開始目標位置から上記所定の目標開度位置(開度-30(%))まで開度位置を減算している。このようにすることで、開弁開始位置学習において、EGRバルブ1が低開度まで閉じてきた段階で、その先をゆっくり閉弁させることができる。
全閉状態判定部18は、上記待機時間が経過すると、一定時間のポジションセンサ4の検出信号電圧の平均値を算出し、この平均値で表される位置を新たな開弁開始位置の学習値として設定する。例えば、1秒間のポジションセンサ4の検出信号電圧の平均値で表される位置を新たな開弁開始位置とする。
この実施の形態1によるバルブ制御装置16では、全閉状態となってもDCモータ2をフィードバック制御しており、駆動デューティ比が上昇する。そこで、DCモータ2への通電を遮断することにより、全閉状態における駆動デューティ比を制限する。
(a)開弁開始位置の学習要求がない。
(b)目標開度位置が現在の実開度位置を下回っている。
(c)実開度位置が全閉位置(開弁開始位置)から所定値以内である。図4の例では、ポジションセンサ4の出力電圧の温度ドリフトとして予想される5(%)を採用している。
(d)駆動デューティ比がDuty制限値を下回っている。図4に示すDuty制限値は、図3と同様に駆動デューティ比-60(%)(第2の閾値)としている。なお、このDuty制限値は、例えばDCモータ2の仕様や実験等で決定した駆動デューティ比の上昇によるDCモータ2の発熱が許容できる駆動デューティ比の上限値を設定する。
(e)上記(a)~(d)の状態が連続して所定期間(第1の待機期間)継続している。この所定期間は、EGRバルブ1が十分に閉弁する時間、すなわち弁体8を全閉位置から弁座7に漏れがない程度に若干押し付ける際に必要な時間で、かつDCモータ2が発熱により損壊しない時間であり、図4の例では800(ms)としている。
図5は、実施の形態1によるEGRバルブ1を駆動させるDCモータ2を軸方向に切断した断面図である。図5に示すDCモータ2はブラシレスモータであり、シャフト3に螺合された円筒状のロータAssy(回転子)24が、ケース25に固着されたステータ26の中空部に挿入されて、ベアリング27によって回転自在に支持されている。また、ロータAssy24には、その軸に垂直な面となるように、磁極位置検出用マグネット(開度位置センサ)28が固着されている。
Claims (12)
- 駆動部と、この駆動部によって直動される駆動シャフト及びバルブシャフトを軸方向に一体化して構成され、前記駆動部の駆動力で軸方向に直動させることにより、バルブハウジングに設けられた弁座に対して弁体を開閉させる一体構造シャフトとを備えたバルブ装置を開閉制御するバルブ制御装置において、
前記バルブ装置の前記一体構造シャフトの直動による実開度位置が目標開度位置に近づくように前記バルブ装置の開度位置をフィードバック制御する駆動制御部と、
全閉指令を受けると、前記駆動制御部に一定のソフトランディング開始目標位置を目標開度位置として設定し、前記実開度位置と前記ソフトランディング開始目標位置との差が第1の閾値になったタイミングで、前記ソフトランディング開始目標位置を徐々に減算した目標開度位置を前記駆動制御部に設定する全閉状態判定部とを備えたことを特徴とするバルブ制御装置。 - ソフトランディング開始目標位置は、全閉位置の学習時における開度位置の検出誤差範囲以上に前回の全閉位置学習値から離れた位置であることを特徴とする請求項1記載のバルブ制御装置。
- 第1の閾値は、バルブ装置の開度位置を検出する開度位置センサの温度ドリフトにより予想される実開度位置と目標開度位置との差以上の値であることを特徴とする請求項1記載のバルブ制御装置。
- 駆動制御部は、駆動部のパルス幅変調制御における駆動デューティ比を変化させることにより、バルブ装置の開度位置を制御し、
全閉状態判定部は、全閉位置において、前記駆動デューティ比が第2の閾値を超える期間が第1の待機期間を経過すると、前記駆動制御部に前記駆動部への通電を遮断するように指示することを特徴とする請求項1記載のバルブ制御装置。 - 全閉状態判定部は、駆動デューティ比が第2の閾値を超える期間が第1の待機期間を経過しても、全閉位置の学習時には駆動制御部への通電遮断指示を行わないことを特徴とする請求項4記載のバルブ制御装置。
- 第2の閾値は、駆動デューティ比の上昇による駆動部の発熱が許容可能な前記駆動デューティ比以上の値であることを特徴とする請求項4記載のバルブ制御装置。
- 第1の待機期間は、バルブ装置が漏れなく閉弁する下限時間以上で、かつ駆動デューティ比の上昇による発熱で駆動部が損壊する上限時間未満の期間であることを特徴とする請求項4記載のバルブ制御装置。
- 駆動部の温度を検出する温度センサを備え、
上限時間は、前記温度センサによって、前記駆動部が損壊する温度が検出されるまでの時間であることを特徴とする請求項7記載のバルブ制御装置。 - 上限時間は、予め求めた動作中の駆動部における温度変化の傾向を規定する予測モデルによって予測された温度が、前記駆動部が損壊する温度に達するまでの時間であることを特徴とする請求項7記載のバルブ制御装置。
- 駆動部は、駆動シャフトに回転子が連結されたモータであり、
駆動制御部による前記モータのパルス幅変調制御で前記回転子の軸受を保持する保持部材が破損する荷重を与えないように駆動デューティ比を制限するデューティ制限部を備えたことを特徴とする請求項4記載のバルブ制御装置。 - 保持部材は、回転子の軸受であるベアリングを保持するウェーブワッシャであり、
デューティ制限部は、前記ウェーブワッシャのセット荷重を超えないように駆動デューティ比を制限することを特徴とする請求項10記載のバルブ制御装置。 - 駆動部と、
前記駆動部により直動される駆動シャフト及びバルブシャフトを軸方向に一体化して構成され、前記駆動部の駆動力で軸方向に直動させることにより、バルブハウジングに設けられた弁座に対して弁体を開閉させる一体構造シャフトと、
前記駆動部を駆動制御することにより、開度位置を制御する請求項1記載のバルブ制御装置とを備えたバルブ装置。
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