JP2008202468A - Output convergence value calculation device for engine system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quickly and accurately calculate output convergence value. <P>SOLUTION: Input to the engine system is set with changing from an initial value to a plurality of set values IN1, IN2,... in order, after input to the engine system is set to an initial value IN0 and the engine system gets in a stable state, and output from the engine system at that time is detected successively. Reference waste time tdR which is waste time during which input is changed from the initial value IN0 to a first set value IN1 is calculated based on output. Output convergence value when input is the second set value IN2 is calculated based on output from a point when only reference waste time tdR elapses after change of the input to the second set value IN2 to a point when only reference waste time tdR elapses after change of the input to the third set value IN3. Output convergence value is calculated in a same manner after the third set value IN3 of the input. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an output convergence value calculation apparatus for an engine system.

  The input to the engine system is sequentially changed and set to a plurality of set values, the output from the engine system at this time is sequentially detected, and the model that simulates the output from the engine system based on the detected output, respectively 2. Description of the Related Art Conventionally, an engine system output convergence value calculation device that constructs and calculates a convergence value of an output from an engine system with respect to an input to the engine system using a corresponding model is conventionally known. In this way, it is possible to easily determine the optimum value or the adapted value of the input to the engine system in a short time.

  In this case, even if the input to the engine system is changed from, for example, the first set value to the next second set value, the output from the engine system does not change greatly immediately, and the input to the engine system is changed. It begins to change greatly when the waste time elapses. Therefore, it is common to simulate the output of the engine system when the input to the engine system is changed to the second set value using a model including a waste time element and a delay element (see, for example, Patent Document 1). .

Japanese Patent Laid-Open No. 2004-360591

  However, the case where the input is changed to the second set value will be described as an example. The output in the waste time when the input is changed to the second set value and set is that the input is the first set value. It is considered that the output changes in response to the input being the second set value when the waste time has elapsed since the input was changed to the second set value. If so, the output from when the input is changed to the second set value until the waste time elapses should be unnecessary data for calculating the output convergence value when the input is the second set value. is there. Even if a model is constructed based on such unnecessary data, an accurate model cannot be constructed, and the output convergence value may not be accurately calculated.

  According to the present invention, in an output convergence value calculation device for an engine system that calculates a convergence value of an output from the engine system when each of the inputs to the engine system is set to a plurality of set values, the input to the engine system is After setting the initial value and the engine system is in a steady state, the input to the engine system is sequentially changed from the initial value to a plurality of setting values, and the output from the engine system at this time is sequentially detected, A reference waste time, which is a waste time when the input to the engine system is changed from the initial value to the first set value, is calculated based on the detected output from the engine system, and the input to the engine system is The convergence value of the output from the engine system at the set value is changed to the certain set value when the input to the engine system is changed. It is to be calculated based on the output from the engine system after the lapse of Luo reference dead time.

  The output convergence value can be calculated accurately in a short time.

  FIG. 1 shows a case where the present invention is applied to an engine system adapting apparatus. However, the present invention can be applied to other uses.

  Referring to FIG. 1, the engine system 1 sequentially detects, for example, a combustion chamber 2, an intake passage 3, an exhaust passage 4, a spark plug 5, a fuel injection valve 6, a throttle valve 8 driven by an actuator 7, and an intake air amount. An air flow meter 9, a catalyst 10 disposed in the exhaust passage 4, a temperature sensor 11 for sequentially detecting the exhaust gas temperature, a crankshaft 12, a rotational speed sensor 13 for generating an output pulse representing the engine rotational speed, and An electronic control unit 14 of the engine system 1 composed of a computer is provided. The air flow meter 9, the temperature sensor 11, and the rotation speed sensor 13 are connected to the electronic control unit 14, and output signals of the air flow meter 9, the temperature sensor 11, and the rotation speed sensor 13 are input to the electronic control unit 14. The spark plug 5, the fuel injection valve 6, and the actuator 7 are also connected to the electronic control unit 14 and controlled based on an output signal from the electronic control unit 20.

  The adaptation device 20 is connected to the exhaust passage 4 of the engine system 1 to detect an amount or concentration of a specific component in the exhaust gas, directly on the crankshaft 12, or a torque converter (not shown), for example. And an electronic control unit 23 of the adapting device 20 including a computer. The exhaust gas sensor 21 and the torque meter 22 are connected to the electronic control unit 23, and output signals from the exhaust gas sensor 21 and the torque meter 22 are input to the electronic control unit 23. The electronic control unit 14 of the engine system 1 is also connected to the electronic control unit 23 of the adapting device 23 and controlled based on an output signal from the electronic control unit 23 of the adapting device 23.

  The adapting device 20 is for obtaining a conforming value of the engine system 1. That is, the input to the engine system 1 such as the fuel injection amount and the ignition timing is adapted to optimize the output from the engine system 1 such as the output torque and the amount of components such as HC and NOx contained in the exhaust gas in each operation state. Calculated as a value. Specifically, the input to the engine system 1 is set to a plurality of set values while fixing the operation state, and the convergence value of the output from the engine system 1 at each input set value is obtained. An optimum input set value is obtained as a conforming value in the operation state. The ignition timing will be described as an example. For example, the ignition timing is set to a plurality of ignition timings while the operation state determined by the required load and the engine speed is fixed, and the convergence value of the output torque at each ignition timing is obtained. The ignition timing that maximizes the convergence value is obtained as the appropriate value in the operating state. In this way, suitable values are obtained for each operating state, and these suitable values are stored in the electronic control unit 14 of the engine system 1 in the form of a map shown in FIG. 2, for example. In the engine system 1, engine control is performed based on the map shown in FIG.

  Next, with reference to FIG. 3, the calculation method of the adaptation value of the Example by this invention is demonstrated. In the embodiment according to the present invention, as shown in FIG. 3, when the engine system 1 is started, the input to the engine system 1 is first set to the initial value IN0. Next, as indicated by X1 in FIG. 3, when the output from the engine system 1 reaches a steady state, that is, when it converges, the input to the engine system 1 is changed to the first set value IN1 in a step shape and held. Next, as indicated by X2, X3,... In FIG. 3, for example, every time a predetermined set time tY elapses, the input to the engine system 1 is changed to the second set value IN2, the third set value IN3,. Changed and retained sequentially. In this case, the set time tY is set to be relatively short, and therefore the input to the engine system 1 is sequentially changed while the output from the engine system 1 does not converge, that is, while the output is in a transient state. In this way, the time required to calculate the fitness value can be greatly shortened. The set time tY may not be constant.

  In this way, the input to the engine system 1 is sequentially set, and the output from the engine system 1 at this time is sequentially detected.

  In this case, the output from the engine system 1 changes as follows. That is, the output first converges to a convergence value OUT0 corresponding to the initial value IN0. Next, after the input is changed to IN1, the output is maintained almost constant until the waste time td1 from X1 to Y1 elapses, and then the output changes significantly when the waste time td1 elapses when Y1 is reached. start. Next, until the waste time td2 from X2 to Y2 elapses after the input is changed to IN2, the output is as if the input has not been changed to IN2, that is, the input is held at IN1. It changes in the same manner, and then changes to Y2 and starts to change greatly in response to the input being changed to IN2. Similarly, until the waste time td3 from X3 to Y3 elapses after the input is changed to IN3, the output changes in the same manner as when the input is held at IN2, and then when Y3 is reached, the input becomes IN3. In response to being changed, it begins to change greatly.

  Here, a case where the output convergence value is calculated when the input is IN2 will be described as an example. A model is constructed using the output of the interval tr2 ′ from X2 to X3 where the input is held in IN2, and this model It is generally considered that the output convergence value is calculated when the input is IN2. However, since the output at the waste time td2 from X2 to Y2 is in response to the input being IN1, as described above, it is data that is unnecessary for calculating the output convergence value when the input is IN2. Should. Accordingly, the output convergence value when the input is IN2 is calculated without using the output at the waste time td2, that is, based on the output after the waste time td2 has elapsed since the input was changed to IN2. Is preferred.

  Further, even after the input is changed from IN2 to IN3, until the waste time td3 elapses, the output continues to change in response to the input being IN2, and therefore the output at the waste time td3 is not input. It should be the data necessary to calculate the output convergence value for IN2. Therefore, it is preferable to calculate the output convergence value when the input is IN2 based on the output until the waste time td3 elapses after the input is changed from IN2 to IN3.

  Then, the output convergence value when the input is IN2 is the output from when the input is changed from IN2 to IN3 after the input time is changed from IN2 to IN3 after the input is changed to IN2 until the waste time td3 elapses. That is, it is preferable to calculate based on the output in the section tr2 from Y2 to Y3. Similarly, the output convergence value when the input is IN1 is based on the output in the interval tr1 from Y1 to Y2, and the output convergence value when the input is IN3 is based on the output in the interval tr3 from Y3 to Y4. It is preferable to calculate.

  In this way, since unnecessary data is excluded and an output convergence value can be calculated using a large number of necessary data, the output convergence value can be accurately calculated. Further, in this case, since a model consisting only of delay elements can be used instead of a model consisting of waste time and delay elements, the output convergence value can be calculated easily and accurately.

  In this case, in order to determine the sections tr1, tr2,..., Waste times td1, td2,. However, the waste times td1, td2,... Can be considered to be substantially constant. Further, the waste time td1 when the input is changed from when the output is in a steady state can be obtained relatively easily and accurately.

  Therefore, in the embodiment according to the present invention, the convergence value of the output from the engine system 1 when the input to the engine system 1 is a certain set value INi (i = 1, 2,..., N) is calculated as follows. Like to do. That is, referring to FIG. 4, first, the waste time td1 when the input is changed from the initial value IN0 to the first set value IN1 is calculated, and the waste time td1 is changed to the reference waste time tdR. Is set. Next, the point in time when the reference waste time tdR has elapsed since the input to the engine system 1 is changed to a certain set value INi is set as a starting point Zi, and the input to the engine system 1 is changed from the set value INi to the next set value INi. A section Str is determined with the end point Z (i + 1) being the point when the reference waste time tdR has elapsed since the change to (i + 1). Next, a model is constructed using the output in this section Str, and the output convergence value when the input is a certain set value INi is calculated using this model.

  That is, for example, when the input is IN1, the output convergence value elapses from the time point Z1 when the reference waste time tdR has elapsed since the input was changed to IN1, and since the input was changed from IN1 to IN2, only the reference waste time tdR has elapsed. The output convergence value when the input is IN2 is calculated based on the output in the section Str1 up to the time point Z2, and the input is changed from IN2 to IN3 from the time Z2 when the reference waste time tdR has elapsed since the input was changed to IN2. It is calculated based on the output in the section Str2 up to the time point Z3 when the reference waste time tdR has elapsed since the change.

  Here, there are various methods for calculating the reference waste times tdR to td1. In the embodiment according to the present invention, a model including a waste time element and a delay element is constructed using the output in the section tr1 ', thereby calculating a reference waste time tdR.

  Therefore, in general terms, the convergence value of the output from the engine system when the input to the engine system is a certain set value is the reference waste time after the input to the engine system is changed to the certain set value. After an elapse of time, the calculation is made based on the output from the engine system until the reference waste time elapses after the input to the engine system is changed from the certain setting value to the next setting value. It will be.

  FIG. 5 shows a routine for executing the output convergence value calculation method of the embodiment according to the present invention.

  Referring to FIG. 5, first, at step 100, the input to the engine system 1 is set to the initial value IN0. In the following step 101, it is determined whether or not the output has reached a steady state, that is, has converged. In the subsequent step 102, the input is sequentially set to a plurality of set values INi (i = 1, 2,..., N). In the subsequent step 103, a reference waste time tdR is calculated. In the following step 104, the section Str is determined. In the following step 105, the output convergence value when the input is INi is calculated based on the output in the section Str.

  Next, another embodiment according to the present invention will be described.

  In the embodiment described above, the section Stri (i = 1, 2,..., N) is determined on the assumption that the actual waste time tdi (i = 1, 2,..., N) is equal to the reference waste time tdR. Based on the output, an output convergence value at the input INi is calculated. However, if the actual waste time tdi is different from the reference waste time tdR, the output convergence value cannot be calculated accurately.

  Therefore, in another embodiment according to the present invention, the section Stri is corrected as necessary, and the output convergence value at the input INi is calculated based on the output in the corrected section Ctri. This will be described in detail with reference to FIGS. 6 and 7 by taking as an example the case of calculating the output convergence value when the input is IN2.

  That is, in another embodiment according to the present invention, first, a model composed of a waste time element and a delay element is constructed using the output in the section Str2 from Z2 to Z3, thereby calculating an additional waste time Δtd. . When this additional waste time Δtd is zero, the actual waste time coincides with the reference waste time tdR, and when the additional waste time Δtd is not zero, the actual waste time td2 is different from the reference waste time tdR. Note that the output in the section from Z2 to X3 can also be used to obtain the additional waste time Δtd.

  FIG. 6 shows a case where Δtd> 0, that is, a case where the actual waste time is longer than the reference waste time tdR. In this case, the time when the reference waste time tdR and the additional waste time Δtd have elapsed since the input was changed to IN2 is set as the start point W2, and the reference waste time tdR and the additional waste time Δtd have elapsed since the input was changed to IN3. A section Ctr2 having the end point W3 as the end point W3 is determined. Next, a model including a delay element is constructed using the output in the corrected section Ctr2, and an output convergence value when the input is IN2 is calculated using the model. As a result, the output convergence value can be accurately calculated. Here, the reference waste time tdR and the additional waste time Δtd represent the actual waste time.

  On the other hand, FIG. 7 shows a case where Δtd <0, that is, a case where the actual waste time is shorter than the reference waste time tdR. In this case, tdR ′ (tdR−α) is calculated by shortening and correcting the reference waste time tdR by, for example, a constant set value α, and the interval for the reference waste time tdR ′ subjected to the shortening correction, that is, the input is changed to IN2. The section Str2 ′ is determined, in which the time point after the corrected reference waste time tdR ′ has elapsed since the start is set as the start point V2, and the time point after the corrected reference waste time tdR ′ since the input is changed to IN3 is set as the end point V3. Is done. For this corrected section Str2 ', an additional waste time Δtd is calculated as in the case of Δtd> 0, a section Ctr2 is determined, and an output convergence value is calculated based on the output in the section Ctr2. In this case, tdR−α + Δtd represents the actual waste time td2.

  Therefore, in general terms, in another embodiment according to the present invention, the actual waste time tdi when the input to the engine system 1 is a certain set value INi (i = 1, 2,..., N) is the reference. It is determined whether or not the time is different from the waste time tdR. When it is determined that the actual waste time tdi is different from the reference waste time tdR, the actual waste time is calculated, and an input to the engine system 1 is set to a certain value. When the convergence value of the output from the engine system at the value INi is changed to a certain set value INi after the input to the engine system 1 is changed to an actual waste time, the input to the engine system is The calculation is based on the output from the engine system until the actual waste time elapses after the set value INi is changed to the next set value IN (i + 1). It becomes door.

  FIG. 8 shows a routine for executing the output convergence value calculation method according to another embodiment of the present invention.

  Referring to FIG. 8, first, at step 200, the input to the engine system 1 is set to the initial value IN0. In the following step 201, it is determined whether or not the output has reached a steady state, that is, has converged. In the following step 202, the input is sequentially set to a plurality of set values INi (i = 1, 2,..., N). In the subsequent step 203, a reference waste time tdR is calculated. In the following step 204, the sections Str are determined based on the reference waste time tdR. In the next step 205, an additional waste time Δtd is calculated based on the output in the section Str. In the next step 206, it is determined whether or not the additional waste time Δtd is zero or a positive value. Next, when Δtd ≧ 0, the routine proceeds to step 207, where the section Ctri is determined. In the following step 208, the output convergence value when the input is INi is calculated based on the output in the section Ctri. When Δtd = 0, the section Ctri determined at step 207 matches the section Str determined at step 204.

  On the other hand, when Δtd <0, the routine proceeds from step 206 to step 209, where the corrected reference waste time tdR ′ is calculated (tdR ′ = tdR−α). In the subsequent step 210, the section Stdi 'is determined based on the corrected reference waste time tdR'. Next, returning to step 205, in step 205, an additional waste time Δtd is calculated based on the output in the section Stri '. Subsequently, it progresses to step 206,207,208 sequentially.

1 is an overall view of an engine system and an adapting device. It is a figure which shows the map of a conformity value. It is a time chart for demonstrating the calculation method of an output convergence value. It is a time chart for demonstrating the calculation method of an output convergence value. It is a flowchart for performing an output convergence value calculation routine. It is a time chart for demonstrating the calculation method of the output convergence value of another Example by this invention. It is a time chart for demonstrating the calculation method of the output convergence value of another Example by this invention. It is a flowchart for performing the output convergence value calculation routine of another Example by this invention.

Explanation of symbols

1 Engine system 14 Electronic control unit 20 Applicable device 23 Electronic control unit

Claims (3)

  In an engine system output convergence value calculation device that calculates an output convergence value of an output from an engine system when an input to the engine system is set to a plurality of set values, the engine system input is set to an initial value. After the system reaches a steady state, the input to the engine system is sequentially changed from the initial value to a plurality of set values, and the output from the engine system at this time is sequentially detected, and the input to the engine system is A reference waste time that is a waste time when the initial set value is changed to the first set value is calculated based on the detected output from the engine system, and when the input to the engine system is a set value The convergence value of the output from the engine system is changed to a reference waste time after the input to the engine system is changed to the certain set value. Output convergence value calculation device for an engine system to be calculated based on the output from the engine system after only has passed.   The convergence value of the output from the engine system when the input to the engine system has a certain set value is the engine system after a reference waste time has elapsed since the input to the engine system was changed to the certain set value. 2. The output of the engine system according to claim 1, wherein the output to the engine system is calculated based on an output from the engine system until a reference waste time elapses after the input value is changed from the certain set value to the next set value. Convergence value calculation device.   It is determined whether or not the actual waste time when the input to the engine system is a set value is different from the reference waste time, and when it is determined that the actual waste time is different from the reference waste time, The actual waste time is calculated, the convergence value of the output from the engine system when the input to the engine system is the certain set value, and the actual value after the input to the engine system is changed to the certain set value. The output convergence value calculation device for an engine system according to claim 1 or 2, wherein the calculation is made based on an output from the engine system after elapse of a waste time.

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