JP4529857B2 - Valve control device - Google Patents

Description

  The present invention relates to a control device (valve control device) for a valve disposed in a flow path of gas that is sucked into and exhausted from an engine like an EGR valve.

  Conventionally, in an EGR valve such as an EGR valve, a valve disposed in a gas flow path (gas flow path) that is sucked into and exhausted from an engine accumulates deposits (deposits) such as oil mist and black smoke. Problems such as insufficient gas flow, gas leakage when fully closed, and slow valve operation have occurred.

  Therefore, in a valve control device that uses a butterfly valve that changes the opening degree by rotating in the flow path as a valve, the valve control device can be used when there is no hindrance to engine operation, such as immediately after the ignition is turned on or off. The deposit attached to the peripheral portion of the valve body and the like is removed by rotating the butterfly valve in a range straddling the closed position (see, for example, Patent Document 1).

  However, since the engine sound is low immediately after the ignition is turned on or off, the operating sound accompanying the deposit removal operation is heard by the occupant, causing discomfort. For this reason, it is preferable to minimize the deposit removal operation as much as possible.

Thus, for example, a technique is considered in which the operation time is selected as an index corresponding to the deposit accumulation amount, and the number of passes through the fully closed position is increased or decreased according to the length of the operation time (see, for example, Patent Document 2). ). However, the deposit accumulation amount varies depending on the engine speed, the history of the fuel injection amount, the number of previous deposit removal operations, and the like. Therefore, when this technique is used, there is a risk of performing an extra removal operation. .
JP 2001-173464 A JP 2003-314377 A

  The present invention has been made to solve the above problems, and it is an object of the present invention to make it possible to reliably remove deposits while suppressing the generation of operating noise in a valve control device.

[Means of Claim 1]
The valve control device according to claim 1 is disposed in a flow path of gas that is sucked and exhausted to and from an engine, and rotates against a resistance force by a driving force applied from a predetermined actuator. The butterfly valve that changes the opening of the flow path of the butterfly, and the removal pattern that removes the deposit deposited between the butterfly valve and the wall of the gas flow path in the rotation range of the butterfly valve, the rotation position of the butterfly valve Removal pattern setting means for setting for each. The removal pattern setting means detects the resistance equivalent amount corresponding to the resistance force in the rotation range of the butterfly valve, and the removal pattern for each rotation position according to the detection value of the resistance force equivalent amount at each rotation position. Set.

  On the butterfly valve, a resistance force due to sliding friction or the like at the bearing or the peripheral edge of the valve body acts in a direction opposite to the rotation direction. Since this resistance force varies according to the deposit amount, the resistance force equivalent amount corresponding to the resistance force can be an index of the deposit amount. The resistance equivalent amount can be considered as a variable having some correlation with the resistance.

  Here, the deposit affecting the resistance force is accumulated in the rotation range of the butterfly valve. That is, not all the deposits deposited in the butterfly valve and its surroundings affect the resistance force, but the deposits deposited between the butterfly valve and the gas flow path wall in the rotation range of the butterfly valve Affects force. Here, “deposit accumulated between the butterfly valve and the wall of the gas flow path” refers to a deposit accumulated at the periphery of the butterfly valve and a gas flow path facing the butterfly valve in the rotation range of the butterfly valve And / or deposits deposited on the walls of the wall.

  As described above, the sliding friction acting on the butterfly valve can be mainly divided into the shaft periphery friction in the bearing and the valve periphery friction in the valve body peripheral portion. Here, the closer the pivot position of the butterfly valve is to the fully closed position, the larger the contact area between the valve body peripheral portion and the flow path wall side seat portion. The closer you get, the stronger you will be. For this reason, the resistance equivalent amount also varies depending on the rotation position so as to correspond to the correlation between the valve periphery friction and the rotation position.

  Therefore, as described above, the resistance equivalent amount is detected in the rotation range of the butterfly valve, and the removal pattern is set for each rotation position according to the detection value of the resistance force equivalent amount at each rotation position. For example, it is possible to perform a deposit removing operation corresponding to the resistance force equivalent amount at each rotation position. As a result, the deposit removal operation can be executed to an appropriate limit, so that the deposit removal can be surely executed while suppressing the generation of the operating sound.

  The removal pattern refers to, for example, the driving mode applied to the butterfly valve at the rotational position, in addition to the later passing mode and non-passing mode, the number of times the butterfly valve passes through the rotational position, and the like. These are various command values obtained in the process of calculating the command value of the driving force (for example, command value of the energization amount when the driving force is applied by the electric actuator). Further, a combination of these (for example, a combination of the number of passes and a driving force) can be used as the removal pattern.

[Means of claim 2]
According to the valve control device of the second aspect, the removal pattern set for the predetermined rotation position is a passing mode in which the butterfly valve rotates including the predetermined rotation position, or a predetermined rotation. Any one of the non-passing modes in which the butterfly valve rotates without including the position, and the removal pattern setting means sets a threshold value for the detection value of the resistance equivalent amount, and the resistance equivalent amount for each rotation position. Depending on the result of comparison between the detected value and the threshold value, either the passing mode or the non-passing mode is set as the removal pattern.
This means shows one form of the removal pattern. As a result, in the deposit removal operation, the butterfly valve is rotated only to the rotation position where the influence of deposit accumulation is large, and the butterfly valve is not rotated to the rotation position where the influence of deposit accumulation is small. Can do. As a result, the deposit removal operation can be executed within an appropriate rotation range.

[Means of claim 3]
According to the valve control device of the third aspect, the removal pattern setting means varies the rotation speed of the butterfly valve in accordance with the size of the range of the rotation position where the removal pattern is set as the passing mode.
Thereby, the rotation speed of the butterfly valve can be determined according to the size of the rotation range (necessary removal range) that requires the deposit removal operation. For this reason, for example, when the required removal range is small and the generation period of the operation sound accompanying the deposit removal operation is short, the rotation speed can be increased and the generation period of the operation sound can be further shortened.

[Means of claim 4]
According to the valve control device of the fourth aspect, the removal pattern set for the predetermined rotation position is the number of times the butterfly valve rotates and passes through the predetermined rotation position. The setting means sets a threshold value for the detection value of the resistance force equivalent amount, and sets the number of passes for each rotation position according to the difference between the detection value of the resistance force equivalent amount and the threshold value.
This means shows one form of the removal pattern. Thereby, in the deposit removal operation, the number of times the butterfly valve passes through the rotation position can be determined according to the resistance equivalent amount at the predetermined rotation position. As a result, the deposit can be reliably removed by increasing or decreasing the number of passes according to the resistance equivalent amount.

[Means of claim 5]
According to the valve control device of the fifth aspect, the removal pattern setting means calculates the correlation equation between the detection value of the resistance force equivalent amount and the rotation position, and detects the resistance force equivalent amount based on the correlation equation. The equivalent amount of resistance force is calculated at a rotation position interval denser than the rotation position where the calculation is performed, and the detection value of the resistance force equivalent amount at the rotation position at which the calculation is performed is used as the detection value of the resistance force equivalent amount. The removal pattern is set for each rotation position using the calculated value.
Thereby, even if the detection interval of the resistance force equivalent amount relative to the rotation position is rough, it is possible to calculate the resistance force equivalent amount at the rotation position other than the rotation position where the detection of the resistance force equivalent amount is performed. For this reason, even if the detection interval of the resistance force equivalent amount with respect to the rotation position is rough, the necessary removal range can be appropriately determined.

[Means of claim 6]
According to the valve control device of the sixth aspect, the removal pattern setting means is a newly obtained detection value of the equivalent amount of resistance force even after the deposit is removed based on the set removal pattern. Accordingly, a removal pattern is set for each rotation position again.
Thereby, even after the deposit removal operation is once executed, the butterfly valve can be rotated again to the rotation position where the influence of deposit accumulation is considered to be still large. Therefore, the rotation of the butterfly valve at the rotation position can be repeated until the influence of deposit accumulation becomes acceptable. As a result, it is possible to reliably remove the deposit while performing the deposit removing operation in an appropriate rotation range.

[Means of Claim 7]
According to the valve control device of the seventh aspect, the removal pattern setting means divides the rotation range of the butterfly valve into a plurality of values, and uses the detected value of the resistance force equivalent amount in each divided rotation range. Then, a representative value of the resistance equivalent amount representative of the resistance equivalent amount of each rotation range is calculated, and a removal pattern is set for each rotation range according to the representative value of the resistance equivalent amount.
This means shows one form of the removal pattern setting means.

[Means of Claim 8]
According to the valve control device of the eighth aspect, the removal pattern setting means corrects the threshold value based on the valve temperature equivalent amount corresponding to the temperature of the butterfly valve, and sets the removal pattern using the corrected threshold value. .
The effect of deposit deposition varies with the temperature of the deposit. Therefore, the resistance force is influenced not only by the amount of deposited deposit but also by the temperature of the deposit. Therefore, by correcting the threshold value based on the valve temperature equivalent amount, the threshold value can be changed to an appropriate size according to the temperature of the deposit. As a result, a more appropriate removal pattern can be set at each rotation position. The valve temperature equivalent amount is, for example, a variable having some correlation with the temperature of the deposit itself, such as the temperature of the gas and the engine coolant temperature, in addition to the temperature of the butterfly valve, that is, the temperature of the deposit itself.

[Means of Claim 9]
According to the valve control device of the ninth aspect, the removal pattern setting means corrects the detection value of the resistance force equivalent amount based on the valve temperature equivalent amount corresponding to the temperature of the butterfly valve, and corresponds to the resistance force after the correction. A removal pattern is set using the detected amount value.
This means removes the influence of the temperature of the deposit on the resistance force by correcting the detected value corresponding to the resistance force.

[Means of Claim 10]
According to the valve control device of the tenth aspect, the removal pattern setting means corrects the representative value of the resistance force equivalent amount based on the valve temperature equivalent amount corresponding to the temperature of the butterfly valve, and the corrected resistance force equivalent amount A removal pattern is set using the representative value of the quantity.
This means removes the influence of the temperature of the deposit on the resistance force by correcting the representative value corresponding to the resistance force.

  The valve control device of the best mode 1 is disposed in a flow path of gas sucked into and exhausted from an engine, and rotates against a resistance force by a driving force applied from a predetermined actuator, A removal pattern for removing deposits deposited between the butterfly valve and the gas flow path wall in the rotation range of the butterfly valve for each rotation position of the butterfly valve. Removal pattern setting means for setting to (1). The removal pattern setting means detects the resistance equivalent amount corresponding to the resistance force in the rotation range of the butterfly valve, and the removal pattern for each rotation position according to the detection value of the resistance force equivalent amount at each rotation position. Set.

  The removal pattern set for the predetermined rotation position is a passing mode in which the butterfly valve rotates including the predetermined rotation position, or the butterfly valve rotates without including the predetermined rotation position. Either of the non-passing modes, the removal pattern setting means sets a threshold value for the detection value of the resistance force equivalent amount, and compares the detection value of the resistance force equivalent amount with the threshold value for each rotation position. Accordingly, either the passing mode or the non-passing mode is set as the removal pattern.

Further, the removal pattern setting means calculates a correlation equation between the detection value of the resistance force equivalent amount and the rotation position, and based on the correlation equation, the removal pattern setting means is denser than the rotation position where the detection of the resistance force equivalent amount is performed. The equivalent amount of resistance force is calculated at the moving position interval. Then, the removal pattern setting means uses the calculated value of the resistance equivalent amount based on the correlation formula as the detection value of the resistance equivalent amount at the rotation position where the calculation is performed, and sets the removal pattern for each rotation position. Set.
The removal pattern setting means corrects the threshold based on the valve temperature equivalent amount corresponding to the temperature of the butterfly valve, and sets the removal pattern using the corrected threshold value.

  According to the valve control device of the best mode 2, the removal pattern setting means varies the rotation speed of the butterfly valve according to the size of the range of the rotation position set with the removal pattern as the passing mode.

  According to the valve control apparatus of the best mode 3, the removal pattern set for the predetermined rotation position is the number of times the butterfly valve rotates and passes through the predetermined rotation position, and the removal pattern setting The means sets a threshold value for the detection value of the resistance force equivalent amount, and sets the number of passes for each rotation position according to the difference between the detection value of the resistance force equivalent amount and the threshold value.

  According to the valve control device of the best mode 4, the removal pattern setting means divides the rotation range of the butterfly valve into a plurality of values, and uses the detected value of the resistance force equivalent amount in each divided rotation range, A representative value of a resistance force equivalent amount representing the resistance force equivalent amount of each rotation range is calculated, and a removal pattern is set for each rotation range in accordance with the representative value of the resistance force equivalent amount.

[Configuration of Example 1]
A configuration of the valve control device 1 according to the first embodiment will be described with reference to FIGS. 1 and 2.
The valve control device 1 is disposed, for example, in a flow path 2 (EGR flow path: hereinafter referred to as a gas flow path 2) for recirculating exhaust gas to the intake side of the engine, and the exhaust gas recirculation amount. It drives and controls the EGR valve that adjusts.

  As shown in FIG. 1, the valve control device 1 is disposed in the gas flow path 2, and rotates to provide a butterfly valve 3 that changes the opening degree of the gas flow path 2 and applies a driving force to the butterfly valve 3. And an actuator 4 that rotates and a control means 5 that controls the operation of the actuator 4.

  The butterfly valve 3 includes a rotating shaft 6 to which a driving force is applied from an actuator 4 via a link mechanism (not shown), and a valve body 7 formed in a symmetric disk shape having the rotating shaft 6 as a central axis. Have The butterfly valve 3 is rotated against the resistance force by the driving force applied from the actuator 4 to vary the opening of the gas flow path 2. This resistance force is generated by the bearing of the rotating shaft 6 or the sliding friction at the peripheral edge of the valve body 7, and its strength varies under the influence of the deposit 8.

  Here, the deposit 8 is a deposit of oil mist, black smoke, etc. contained in the exhaust gas. Further, the deposit 8 that affects the resistance force is accumulated in the rotation range of the butterfly valve 3. That is, not all of the butterfly valve 3 and the deposit 8 deposited around the butterfly valve 3 affect the resistance force, but accumulate between the butterfly valve 3 and the wall of the gas flow path 2 in the rotation range of the butterfly valve 3. The deposited deposit 8 affects the resistance. Here, “the deposit 8 deposited between the butterfly valve 3 and the wall of the gas flow path 2” refers to the deposit 8 deposited on the periphery of the butterfly valve 3 and the butterfly valve in the rotation range of the butterfly valve 3. 3 and / or deposit 8 deposited on the wall of gas flow path 2 facing each other.

  The actuator 4 is a known electric actuator such as an electric motor that receives power and generates a driving force.

  The control unit 5 includes a known drive circuit 9 that intermittently supplies power to the actuator 4 from a power source (not shown), and a microcomputer 10 that outputs a command signal to the drive circuit 9 and supplies power to the actuator 4 from the power source.

  The microcomputer 10 is a computer having a known structure including a CPU that performs control processing and arithmetic processing, a storage circuit such as a ROM and RAM that stores various programs and data, an input circuit, an output circuit, and the like. The microcomputer 10 calculates various command values for driving and controlling the actuator 4 in accordance with detection values input from various sensors such as the engine speed sensor 11, the accelerator opening sensor 12, and the water temperature sensor 13. At the same time, a command signal based on this command value is synthesized and output to the drive circuit 9.

  The microcomputer 10 functions as a removal pattern setting unit that sets a removal pattern for removing the deposit 8 for each rotation position of the butterfly valve 3.

  The removal pattern set for the predetermined rotation position by the removal pattern setting unit of the first embodiment does not include the passing mode in which the butterfly valve 3 rotates including the rotation position or the rotation position. The non-passing mode in which the butterfly valve 3 rotates. Then, the removal pattern setting means sets a threshold value for the detection value of the resistance force equivalent amount, and sets the threshold value for the detection value of the resistance force equivalent amount or the non-passing mode according to the result of comparison between the detection value of the resistance force equivalent amount and the threshold value. One of the modes is set as a removal pattern.

  Here, the resistance equivalent amount can be considered as a variable having a correlation with the resistance force, and can be an index of the deposit amount. Then, the removal pattern setting unit of the first embodiment selects the command value of the duty ratio of the command signal output to the drive circuit 9 as the resistance force equivalent amount from the power supply equivalent amount corresponding to the power supply amount to the actuator 4. To do. That is, the removal pattern setting means detects a command value of the duty ratio (hereinafter referred to as a duty value) for each rotation position and sets it as a detected value corresponding to the resistance force.

  The power supply equivalent amount is a variable having a correlation with the power supply amount to the actuator 4, and the above-described duty value and various command values obtained in the process of calculating the duty value, for example, the command value of the power supply amount , A command value of the valve opening, and the like.

  When the resistance equivalent amount is the duty value of the command signal output to the drive circuit 9, it is considered that this duty value has a positive correlation with the resistance force. For this reason, the removal pattern setting means regards that the resistance value is stronger when the detected value of the duty value is larger than the threshold value as a result of the comparison between the detected value of the duty value and the threshold value (that is, the deposit amount is smaller). Set the removal pattern to pass mode. On the contrary, if the detected value of the duty value is smaller than the threshold value, the removal pattern setting means regards that the resistance is weak (that is, regards that the deposit amount is small) and sets the removal pattern to the non-passing mode. To do.

  The removal pattern setting means calculates a correlation equation between the detected value of the duty value and the rotation position, and based on this correlation equation, the rotation position is denser than the rotation position where the actual detection of the duty value is performed. Calculate the duty value at intervals. And a removal pattern setting means sets a removal pattern for every rotation position using the calculated value based on a correlation formula as a detection value of the duty value in the rotation position where this calculation was performed.

  For example, as shown in FIG. 2, the removal pattern setting means includes a total closed position θ0, a fully open position θF, and a total of eight rotation positions θ1 to θ6 between the fully closed position θ0 and the fully open position θF. Are actually detected at the rotation positions θ0 to θ6, θF (hereinafter, the rotation position at which the duty value is actually detected is referred to as “actual detection position”). The removal pattern setting means detects the duty value at the actual detection positions θ0 to θ1 using the actual detection value T0 at the actual detection position θ0, the actual detection value T1 at the actual detection position θ1, and the actual detection positions θ0 and θ1. A correlation formula between the value and the rotation position is calculated. In the removal pattern setting unit of the first embodiment, this correlation equation is linearly interpolated between the point (θ0, T0) and the point (θ1, T1) in the coordinate system of the detected value of the duty value and the rotation position. It is set as the primary correlation line obtained by this.

  Then, similarly, the removal pattern setting means is arranged between the point (θ1, T1) and the point (θ2, T2), between the point (θ2, T2) and the point (θ3, T3), and between the point (θ3, T3). ) And the point (θ4, T4), the point (θ4, T4) and the point (θ5, T5), the point (θ5, T5) and the point (θ6, T6), the point (θ6, Similar linear correlation lines are obtained by linear interpolation between T6) and the points (θF, TF). Then, the removal pattern setting means creates a total correlation equation between the detected value of the duty value and the rotation position for the entire rotation range of the butterfly valve 3 using these primary correlation lines.

  Then, the removal pattern setting means uses this total correlation equation to calculate a resistance equivalent amount at a rotational position interval denser than the actual detection positions θ0 to θ6 and θF, and the calculated value is calculated. The detected value of the duty value at the rotation position (hereinafter, the rotation position at which the detected value of the duty value is calculated is referred to as “calculated position”). Then, the removal pattern setting means compares the detected value of the duty value with the threshold value at both the actual detection position and the calculation position, and depending on the comparison result, either the passing mode or the non-passing mode is removed. Set as.

  For example, the actual detection values T0 to T6 and TF at the actual detection positions θ0 to θ6 and θF are larger than the threshold values at the actual detection positions θ0 to θ2, and the actual detection positions θ3 to θ6, θF. Then, it is assumed that the actual detection values T3 to T6 and TF are smaller than the threshold value. In this case, it is considered that the detected value of the duty value and the threshold value are reversed between the actual detection position θ2 and the actual detection position θ3. Furthermore, between the actual detection position θ2 and the actual detection position θ3, the calculated value using the correlation line is larger than the threshold value at the calculated position smaller than the position θG, and the calculated correlation value is larger than the threshold value at the calculated position larger than the position θG. Suppose that the calculated value using is smaller than the threshold value.

  As a result, the removal pattern setting means sets the removal pattern in the passing mode in the rotation range from the actual detection position θ0 to the position θG, and sets the removal pattern in the non-passing mode in the rotation range from the position θG to the actual detection position θF. To do.

  Further, the removal pattern setting means corrects the threshold value based on the valve temperature equivalent amount corresponding to the temperature of the butterfly valve 3, and compares the detected value of the duty value with the corrected threshold value in the pass mode or the non-pass mode. A removal pattern is set for either one.

  Here, the valve-equivalent amount is a variable having a correlation with the temperature of the deposit 8, and includes the temperature of the exhaust gas, the temperature of the engine cooling water, and the like in addition to the temperature of the butterfly valve 3 itself. Since the temperature of the exhaust gas and the temperature of the engine cooling water are often preliminarily provided with a detection sensor such as the water temperature sensor 13, the amount corresponding to the valve temperature without increasing the cost due to the new arrangement of the sensor. Can be adopted as.

  Further, when the temperature of the exhaust gas is employed as the valve temperature equivalent amount, the temperature of the exhaust gas has a positive correlation with the temperature of the deposit 8. Further, the resistance becomes weaker as the temperature of the deposit 8 is higher. Therefore, it is considered that the temperature of the exhaust gas has a negative correlation with the resistance force.

  Therefore, when the exhaust gas temperature is adopted as the valve temperature equivalent amount, the removal pattern setting means corrects the threshold value as follows in consideration of the effectiveness of the deposit 8 removal. In other words, the removal pattern setting means corrects the threshold value to be reduced when the temperature of the exhaust gas rises. That is, the removal pattern setting means corrects the threshold value in a direction in which the rotation range set in the passing mode becomes wider when the temperature of the exhaust gas rises. On the contrary, the removal pattern setting means corrects the threshold value to be increased when the temperature of the exhaust gas decreases. That is, the removal pattern setting unit corrects the threshold value in a direction in which the rotation range set in the passing mode is narrowed when the temperature of the exhaust gas is lowered.

[Operation of Example 1]
The operation of the valve control device 1 according to the first embodiment will be described with reference to FIGS. 3 and 4.
First, the resistance force itself is mainly generated by sliding friction, and this sliding friction can be divided into axial friction at the bearing of the rotating shaft 6 and valve peripheral friction at the peripheral portion of the valve body 7. And the closer the rotation position is to the fully closed position, the larger the contact area between the peripheral portion of the valve body 7 and the wall side sheet portion of the gas flow path 2, so that the rotation around the valve position is the fully closed position. The closer the position is, the stronger it becomes, and the increase with respect to the rotational position is particularly remarkable near the fully closed position.

  For this reason, the detected value of the duty value actually detected and calculated by the removal pattern setting means has a correlation as shown by correlation lines A0 to A3 with respect to the rotation position, as shown in FIG. That is, the detected value of the duty value shows a peak when the rotational position is at the fully closed position, and rapidly decreases as the distance from the fully closed position increases in the range near the fully closed position. Then, the detected value of the duty value decreases with the degree of decrease being reduced in the rotation range farther from the fully closed position than in the vicinity of the fully closed position.

  Further, the resistance increases as the deposit amount increases. For this reason, the detected value of the duty value increases as the deposit amount increases (see correlation lines A0 to A3). For this reason, the rotation range (see rotation ranges B1 to B3 shown in FIG. 3) in which the detected value of the duty value is larger than the threshold value becomes wider as the deposit accumulation amount increases. That is, as the deposit accumulation amount increases, the rotation range (necessary removal range) that requires the deposit removal operation becomes wider.

  For example, the detected value of the duty value in the ideal state where the deposit accumulation amount is zero is smaller than the threshold value in the entire rotation range as indicated by the correlation line A0. For this reason, the removal pattern setting means sets the non-passing mode as the removal pattern in the entire rotation range. That is, no deposit removal operation is performed.

  Next, when the detected value of the duty value is larger than the threshold value in a part of the rotation range B1 in the vicinity of the fully closed position as shown by the correlation line A1, the removal pattern setting unit needs the rotation range B1. It is regarded as a removal range, a passing mode is set as a removal pattern in the rotation range B1, and a non-passing mode is set in a rotation position other than the rotation range B1. That is, as shown by the operation line C1 in FIG. 4, the butterfly valve 3 rotates only in the rotation range B1, and the deposit removal operation is executed.

  Note that the removal pattern setting means of the first embodiment sets the number of reciprocating rotations of the butterfly valve 3 in one deposit removal operation to 3 times. That is, the butterfly valve 3 rotates six times through the same rotation position within the rotation range B1.

  Next, when the detected value of the duty value becomes larger than the threshold value in the rotation range B2 that combines all of the vicinity of the fully closed position and a part other than the vicinity of the fully closed position as in the correlation line A2, The removal pattern setting means regards the rotation range B2 as a necessary removal range, sets a passing mode as a removal pattern in the rotation range B2, and sets a non-passing mode at a rotation position other than the rotation range B2. That is, like the operation line C2 of FIG. 4, the butterfly valve 3 rotates only in the rotation range B2, and the deposit removal operation is executed.

  Next, when the detected value of the duty value is larger than the threshold value in the rotation range B3 indicating the entire rotation range of the butterfly valve 3 as shown by the correlation line A3, the removal pattern setting unit determines whether the rotation pattern B3 is the rotation range B3. Is regarded as a necessary removal range, and a passing mode is set as a removal pattern in the rotation range B3. That is, as shown by the operation line C3 in FIG. 4, the butterfly valve 3 rotates in the rotation range B3, and the deposit removing operation is executed.

[Effect of Example 1]
The valve control device 1 according to the first embodiment includes a function of a removal pattern setting unit that sets a removal pattern for removing the deposit 8 for each rotation position of the butterfly valve 3, and the removal pattern setting unit corresponds to a resistance force. The duty value to be detected is detected within the rotation range of the butterfly valve 3, and a removal pattern is set for each rotation position in accordance with the detected value of the duty value at each rotation position.
The duty value varies for each rotational position according to the amount of deposit 8 deposited. Therefore, if the duty value is detected in the rotation range of the butterfly valve 3 and the removal pattern is set for each rotation position according to the detected value of the duty value at each rotation position, the duty at each rotation position is set. A deposit removal operation can be performed in accordance with the detected value. As a result, the deposit removal operation can be executed to an appropriate limit, so that the deposit removal can be surely executed while suppressing the generation of operation noise.

The removal pattern set for each rotation position is a passing mode in which the butterfly valve 3 rotates including the rotation position, or a non-passage in which the butterfly valve 3 rotates without including the rotation position. In any one of the modes, the removal pattern setting means sets a threshold value for the detected value of the duty value, compares the detected value of the duty value with the threshold value for each rotation position, and according to the result of the comparison, Either the passing mode or the non-passing mode is set as the removal pattern.
Thereby, the butterfly valve 3 can be rotated only to the rotation position where the influence of deposit accumulation is large, and the butterfly valve 3 can be prevented from rotating to the rotation position where the influence of deposit accumulation is small. As a result, the necessary removal range can be appropriately determined.

Further, the removal pattern setting means calculates a correlation formula between the detected value of the duty value and the rotation position, and based on the correlation formula, a calculation position at a denser interval than the actual detection position where the actual detection of the duty value is performed. To calculate the duty value. Then, the removal pattern setting means sets the removal pattern using the calculated value as a detected value of the duty value at the calculated position where the calculation is performed.
Thereby, even if the actual detection interval of the duty value with respect to the rotation position is rough, the detection value of the duty value can be calculated at a calculation position with a denser interval than the actual detection position. For this reason, even if the actual detection interval of the duty value with respect to the rotation position is rough, the necessary removal range can be appropriately determined.

Further, the removal pattern setting means corrects the threshold based on the valve temperature equivalent amount corresponding to the temperature of the butterfly valve 3, and sets the removal pattern by comparing the detected value of the duty value with the corrected threshold value.
The influence of the deposit 8 varies depending on the temperature of the deposit 8. Therefore, the resistance force is affected not only by the amount of deposit 8 but also by the temperature of the deposit 8. Therefore, by correcting the threshold value based on the valve temperature equivalent amount, the threshold value can be changed to an appropriate size according to the temperature of the deposit 8. As a result, the necessary removal range can be appropriately set according to the temperature of the deposit 8.

  The removal pattern setting means of the second embodiment varies the rotational speed of the butterfly valve 3 according to the size of the necessary removal range. For example, when the size of the necessary removal range is smaller than a predetermined required value, the rotation speed is set to a predetermined high speed value. When the size of the necessary removal range is larger than the necessary value, the rotation speed is set to the high speed value. Slower value than slower.

  For example, when the required value is a size between the rotation range B1 and the rotation range B2, the size of the rotation range B1 is smaller than the required value. Therefore, the rotation speed when the rotation range B1 is the required removal range is a high speed value, and the rotation speed when the rotation ranges B2 and B3 are the required removal range is the low speed value. As a result, as shown in FIG. 5, the operation line C1 ′ when the rotation range B1 is the required removal range is sloped more than the operation lines C2 and C3 when the rotation ranges B2 and B3 are the required removal range, as shown in FIG. Becomes larger.

  Thus, when the size of the necessary removal range is smaller than the necessary value, it is possible to shorten the generation period of the operating sound associated with the deposit removal operation by increasing the rotation speed in the deposit removal operation.

[Configuration of Example 3]
In the valve control device 1 of the third embodiment, the removal pattern set for the predetermined rotation position is the number of times the butterfly valve 3 passes through the rotation position, and the removal pattern setting means Then, a threshold value for the detected value of the duty value is set, and the number of passes is set for each rotation position according to the difference between the detected value of the duty value and the threshold value.

  Here, as shown in FIG. 6, the removal pattern setting unit of the third embodiment sets the number of passages to zero when the difference ε is less than zero with respect to the difference ε between the detected value of the duty value and the threshold value. The removal pattern setting means sets the number of passes to 2 when the difference ε is zero or more and less than the predetermined value d, and sets the number of passes to 4 when the difference ε is not less than the predetermined value d and less than the predetermined value 2d. When the difference ε is not less than the predetermined value 2d and less than the predetermined value 3d, the number of passes is set to 6, and when the difference ε is not less than the predetermined value 3d, the number of passes is set to 8.

[Operation of Example 3]
The operation of the valve control device 1 according to the third embodiment will be described with reference to FIG.
When the detected value of the duty value draws the correlation line A4 in FIG. 7A, the detected value of the duty value is smaller than the threshold value in the entire rotation range, and the difference ε is smaller than zero in the entire rotation range. . For this reason, since the removal pattern setting means sets the number of passages to zero at all the rotational positions, the deposit removal operation is not executed at all.

  On the other hand, when the detected value of the duty value draws the correlation line A5, the detected value of the duty value is larger than the threshold value in the rotation ranges B4 to B9. The difference ε is not less than the predetermined value d and less than the predetermined value 2d in the rotation ranges B4 and B8, and is not less than the predetermined value 2d and less than the predetermined value 3d in the rotation ranges B5 and B7. Is greater than or equal to the predetermined value 3d, becomes zero or more and less than the predetermined value d in the rotation range B9, and becomes less than zero in the rotation range B10.

  For this reason, the number of passes is set to 4 in the rotation ranges B4 and B8, set to 6 in the rotation ranges B5 and B7, set to 8 in the rotation range B6, and set to 2 in the rotation range B9. In the rotation range B10, it is set to zero. As a result, when the deposit removing operation is executed, the butterfly valve 3 rotates so as to draw an operation line C4 as shown in FIG.

  That is, the butterfly valve 3 rotates toward the fully open position in the order of the rotation range B6 → the rotation range B7 → the rotation range B8 → the rotation range B9, and then changes the rotation direction to change the rotation range B9 → turns. It rotates to the overturn side fully open position in the order of moving range B8 → turning range B7 → turning range B6 → turning range B5 → turning range B4. Then, the butterfly valve 3 changes its rotation direction again, and similarly rotates and passes through the rotation range in the order indicated by the operation line C4.

[Effect of Example 3]
The removal pattern of the third embodiment is the number of times that the butterfly valve 3 passes through a predetermined rotation position, and the removal pattern setting means sets a threshold value for the detected value of the duty value for each rotation position. In addition, the number of passes is set according to the difference between the detected value of the duty value and the threshold value.
Thereby, the number of passages of the rotation position in the deposit removal operation can be determined according to the detected value of the duty value at the predetermined rotation position. As a result, deposits can be reliably removed by increasing the number of passes at the rotational position where the detected value of the duty value is large (that is, the resistance force is large).

[Configuration of Example 4]
For example, as shown in FIG. 8, the removal pattern setting means of the valve control device 1 of Example 4 divides the entire rotation range of the butterfly valve 3 into seven rotation ranges B11 to B17. And a removal pattern setting means calculates the representative value of the duty value which represents each range of rotation range B11-B17 using the actual detection value of the duty value actually detected within each range. Then, the removal pattern setting means compares the representative value with the threshold value, and sets the removal pattern according to the comparison result.

  Here, the removal pattern setting means calculates the maximum value in each of the rotation ranges B11 to B17 as a representative value. For example, when there are two actual detection values T11 and T12 in the rotation range B11, and T11 is larger than T12, the removal pattern setting unit sets the representative value of the rotation range B11 to T11. Hereinafter, similarly, the removal pattern setting means calculates the representative values of the rotation ranges B12 to B17.

  Then, the removal pattern setting means compares these representative values with threshold values. As a result, it is assumed that the representative value is larger than the threshold value in the rotation ranges B11 to B13 and B15. In this way, when the rotation range in which the value on the detected value side of the duty value is larger than the threshold value occurs discontinuously, the removal pattern set at each rotation position is selected from the following two modes: Is done.

  That is, the removal pattern setting means rotates the predetermined position a predetermined number of times and reaches a predetermined number of times, and does not pass the rotational position at all or rotates less than the predetermined number of times. The removal pattern is set by selecting from two modes that have not reached the predetermined number of times. That is, when the representative value is larger than the threshold value, the removal pattern setting unit determines that the deposit removal operation is strong and the removal pattern is set to the predetermined number of times reaching mode. On the other hand, when the representative value is smaller than the threshold value, the removal pattern setting means determines that the resistance is weak and the deposit removal operation is unnecessary, and sets the removal pattern to the unreachable mode a predetermined number of times. That is, the range in which the predetermined number of times reaching mode is set is the necessary removal range.

[Operation of Example 4]
The operation of the valve control device 1 according to the fourth embodiment will be described with reference to FIGS. 8 and 9. In addition, when the predetermined number of times reaching mode is set, the number of times of rotating and passing through the rotation position is six.

  As shown in FIG. 8, when the representative value of the duty value becomes larger than the threshold value in the rotation ranges B11 to B13 and B15, the removal pattern setting means sets the rotation ranges B11 to B13 and B15 as the necessary removal ranges. The reaching mode is set a predetermined number of times for the rotation positions included in the rotation ranges B11 to B13 and B15. Further, the removal pattern setting means sets the unreachable mode a predetermined number of times for the rotation positions included in the rotation ranges B14, B16, B17. As a result, when the deposit removing operation is executed, the butterfly valve 3 rotates so as to draw an operation line C5 as shown in FIG.

  In other words, the butterfly valve 3 reciprocates twice in the rotation ranges B11 to B13, and then sequentially passes through the rotation range B11 → the rotation range B12 → the rotation range B13 → the rotation range B14 from the fully closed position. The rotation range 15 is reached. In the process so far, the butterfly valve 3 rotates and passes through the rotation ranges B11 to B13 five times. Then, after the butterfly valve 3 reciprocates the rotation range B15 three times, that is, after rotating through the rotation position included in the rotation range B15 six times, the rotation range B14 → The rotation range B13 → the rotation range B12 → the rotation range B11 is sequentially passed to return to the fully closed position. In the process of returning to the fully closed position, the butterfly valve 3 rotates once through the rotation ranges B11 to B13.

  As described above, the butterfly valve 3 rotates and passes through the rotation positions included in the rotation ranges B11 to B13 and B15, so that the deposit removal operation is performed in the rotation ranges B11 to B13 and B15. Execute.

[Modification]
According to the removal pattern setting means of this embodiment, the number of times of setting the removal pattern and the number of times of performing the deposit removal operation are limited to one time. However, the deposit 8 is once removed based on the set removal pattern. Even after the breakage, the deposit removal operation may be performed again by setting a removal pattern for each rotation position in accordance with the newly obtained detection value of the duty value.
Thereby, even after the deposit removing operation is once executed, the butterfly valve 3 can be rotated and passed again to the rotating position where the influence of the deposit 8 is considered to be still large. For this reason, the butterfly valve 3 is repeatedly rotated and passed at the rotation position until the influence of the deposit 8 is acceptable (that is, until the equivalent resistance force is acceptable). it can. As a result, it is possible to reliably remove the deposit 8 while executing the deposit removing operation in an appropriate rotation range.

  According to the removal pattern setting means of the present embodiment, correction based on the valve temperature equivalent amount is performed on the threshold value, and the removal pattern is set using the corrected threshold value, but the resistance force equivalent amount is based on the valve temperature equivalent amount. And the removal pattern may be set using the corrected resistance equivalent amount.

  According to the removal pattern means of the first to third embodiments, the rotation positions at which the detected value of the duty value is compared with the threshold are the actual detection positions θ0 to θ6, θF, and the calculated position. Only in the actual detection positions θ0 to θ6 and θF, the removal pattern may be set by comparing the detected value of the duty value with the threshold value. In this case, the passing mode and the non-passing mode may be set with the actual detection positions θ0 to θ6 and θF as boundaries.

  According to the removal pattern means of the first to third embodiments, in the coordinate system of the rotation position and the detection value of the duty value, the coordinates at the actual detection position are linearly interpolated to thereby detect the duty value detection value and the rotation value. Although the correlation formula with the moving position is created, the creation method of the correlation formula is not limited to such a form. For example, the correlation value may be created by applying the values of coordinates at all actual detection positions to a Newton forward interpolation polynomial, Lagrange interpolation polynomial, spline interpolation polynomial, or the like.

According to the removal pattern setting unit of the fourth embodiment, the representative value of the duty value is the maximum value of the detected value of the duty value in each of the rotation ranges B11 to B17, but in each of the rotation ranges B11 to B17. You may employ | adopt the average value of the detected value of a duty value as a representative value of a duty value.
In this case, even if the detected value of the duty value is biased at a specific rotation position, the bias can be diluted by calculating and using the average value. For this reason, it is possible to prevent the rotation range requiring the deposit removal operation from being unnecessarily enlarged or reduced due to the bias of the detected value of the duty value generated at the specific rotation position.

  Further, the representative value of the duty value may be corrected based on the valve temperature equivalent amount, and the removal pattern may be set using the corrected representative value, or the threshold value for the representative value may be corrected based on the valve temperature equivalent amount. The removal pattern may be set using the corrected threshold value. Further, even after deposit removal is performed once based on the set removal pattern, the removal pattern is set again according to the representative value of the newly obtained duty value, and the deposit removal operation is performed. It may be.

  Although the valve control device 1 of this embodiment controls the drive of the EGR valve, it can also control the exhaust throttle valve, the throttle valve, and the like.

  The resistance equivalent amount in this embodiment is a detected value of a duty value (command value of the duty ratio of the command signal output to the drive circuit 9) which is one of the power supply equivalent amounts. (The command value of the energization amount to the actuator 4, the command value of the valve opening of the butterfly valve 3, etc.) may be used as the resistance equivalent amount.

  Alternatively, the resistance equivalent amount may be estimated based on the operation history of the engine, and the estimated value may be a detected value of the resistance equivalent amount. This estimation can be performed by adding the deposit accumulation equivalent amount corresponding to the increase in the resistance force due to the deposition of the deposit 8 to the ideal value of the resistance force equivalent amount in the ideal state where the deposit accumulation amount is zero. The deposit accumulation equivalent amount can be calculated based on the engine operation history, for example, the fuel injection amount and the engine speed history. Further, the resistance equivalent amount used as the ideal value may be a variable based on a power supply equivalent amount such as a detected value of the duty value, or may be a variable based on the resistance force itself calculated by an experiment, a numerical simulation, or the like.

  Further, when a negative pressure type actuator is employed as the actuator 4, the negative pressure amount and a variable having a correlation with the negative pressure amount can be set as a resistance force equivalent amount. Further, when the hydraulic actuator is employed, the hydraulic pressure amount and the variable having a correlation with the hydraulic pressure amount can be the resistance force equivalent amount.

(A) is a block diagram of a valve | bulb control apparatus, (b) is AA sectional drawing of (a) (Example 1). (Example 1) which is a state diagram which shows the detection state of resistance equivalent amount. (Example 1) which is a correlation diagram of the rotation position of a butterfly valve and resistance equivalent amount. (Example 1) which is an operation figure which shows the rotation condition of the butterfly valve in deposit removal operation. (Example 2) which is an operation figure which shows the rotation condition of the butterfly valve in deposit removal operation. (Example 3) which is a setting map for setting the frequency | count of passage in a deposit removal operation. (A) is a correlation diagram of the rotation position of a butterfly valve and resistance equivalent amount, (b) is an operation figure which shows the rotation state of a butterfly valve in deposit removal operation (Example 3). (Example 4) which is a correlation diagram of the rotation position of a butterfly valve and resistance equivalent amount. (Example 4) which is an operation figure which shows the rotation condition of the butterfly valve in deposit removal operation.

Explanation of symbols

1 Valve control device 2 Gas flow path (flow path)
3 Butterfly valve 4 Actuator 8 Deposit 10 Microcomputer (removal pattern setting means)

Claims (10)

A butterfly that is disposed in a flow path of a gas that is sucked into and exhausted from an engine and that rotates against a resistance force by a driving force applied from a predetermined actuator to vary the opening of the flow path of the gas A valve,
A removal pattern setting means for setting, for each rotation position of the butterfly valve, a removal pattern for removing deposits accumulated between the butterfly valve and the wall of the gas flow path in the rotation range of the butterfly valve; With
The removal pattern setting means detects a resistance force equivalent amount corresponding to a resistance force in a rotation range of the butterfly valve, and removes the removal force for each rotation position according to a detection value of the resistance force equivalent amount in each rotation position. A valve control device characterized by setting a pattern. The valve control device according to claim 1,
The removal pattern set for the predetermined rotation position is a passing mode in which the butterfly valve rotates including the predetermined rotation position, or the butterfly valve rotates without including the predetermined rotation position. One of the moving non-passing modes,
The removal pattern setting means sets a threshold value for the detection value of the resistance force equivalent amount and sets the threshold value for the detection value of the resistance force equivalent amount to the threshold value for each rotation position according to the comparison result between the detection value of the resistance force equivalent amount and the threshold value. One of the passage modes is set as the removal pattern, The valve control device characterized by things. The valve control device according to claim 2,
The valve control device according to claim 1, wherein the removal pattern setting means varies a rotation speed of the butterfly valve in accordance with a size of a range of a rotation position where the removal pattern is set as the passing mode. The valve control device according to claim 1,
The removal pattern set for the predetermined rotation position is the number of times the butterfly valve rotates and passes through the predetermined rotation position,
The removal pattern setting means sets a threshold value for the detection value of the resistance force equivalent amount, and sets the number of passes according to the difference between the detection value of the resistance force equivalent amount and the threshold value for each rotation position. Valve control device. The valve control device according to any one of claims 1 to 4,
The removal pattern setting means includes
Calculate the correlation between the detection value of the resistance force equivalent amount and the rotation position, and based on this correlation equation, the resistance force equivalent at the rotation position interval denser than the rotation position where the detection of the resistance force equivalent amount is performed Calculate the quantity,
The removal pattern is set for each rotation position using a calculated value of the resistance force equivalent amount based on the correlation equation as a detection value of the resistance force equivalent amount at the rotation position where the calculation is performed. Valve control device. The valve control device according to claim 1,
The removal pattern setting means performs the removal again for each rotation position according to the newly obtained detection value of the equivalent amount of resistance force even after the deposit is removed based on the set removal pattern. A valve control device characterized by setting a pattern. The valve control device according to claim 1,
The removal pattern setting means divides a rotation range of the butterfly valve into a plurality of ranges, and uses a detection value of a resistance force equivalent amount in each divided rotation range to detect a resistance force equivalent amount in each rotation range. The representative value of the equivalent resistance force representing
The valve control apparatus according to claim 1, wherein the removal pattern is set for each rotation range in accordance with a representative value of a resistance equivalent amount. In the valve control device according to any one of claims 2 to 4,
The valve control apparatus, wherein the removal pattern setting means corrects a threshold value based on a valve temperature equivalent amount corresponding to a temperature of the butterfly valve, and sets the removal pattern using the corrected threshold value. In the valve control device according to any one of claims 2 to 4,
The removal pattern setting unit corrects the detection value of the resistance force equivalent amount based on the valve temperature equivalent amount corresponding to the temperature of the butterfly valve, and uses the corrected detection value of the resistance force equivalent amount to correct the removal pattern. A valve control device characterized by setting. The valve control device according to claim 7,
The removal pattern setting means corrects the representative value of the resistance equivalent amount based on the valve temperature equivalent amount corresponding to the temperature of the butterfly valve, and uses the corrected representative value of the resistance equivalent amount to correct the removal pattern. A valve control device characterized by setting.

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