JP2008045476A - Method for and device of adapting internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for and a device of adapting an internal combustion engine, capable of reducing time and measuring manhours required for adapting work for determining an adapting value of a separate internal combustion engine, when determining the adapting value in the internal combustion engine being a reference. <P>SOLUTION: Respective reference internal combustion engine and adapting object internal combustion engine, determine an engine control state or an area of measuring a value of a characteristic parameter Y for determining the adapting value to the adapting object internal combustion engine based on a comparison (S113 and S115), by comparing the value of the characteristic parameter Y provided when performing the same control on the same control parameter Xa (S105). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method and apparatus for adapting an internal combustion engine, that is, a method and apparatus for determining a conforming value of a control parameter used in controlling an internal combustion engine.

  In general, control of an internal combustion engine is performed by adjusting the throttle opening, ignition timing, intake / exhaust valve on / off valve characteristics, fuel injection amount, etc. so as to satisfy the requirements for the characteristics of the internal combustion engine such as generated torque, exhaust emission and fuel consumption. This is done by changing the value of the control parameter. These control parameters have optimum values for each operating state determined by, for example, the engine load (generated torque) and the engine speed in accordance with the request for the internal combustion engine at that time. It is necessary to set the optimum value of the control parameter in advance as a target value.

The optimum value of the control parameter for each operating state is generally a value of a characteristic parameter that represents the characteristics of the internal combustion engine, such as the generated torque and NO _X emission amount, when the control parameter is set to various values. Is obtained by an operation for obtaining an optimum value (that is, an adapted value) of each control parameter for each operating state from the result, that is, an adapted operation.

  In such adaptation work, it is generally necessary to determine the characteristic parameter value during steady operation (that is, the steady value of the characteristic parameter). Therefore, the operation is performed for each measurement point set by changing the control parameter value. Wait until the condition stabilizes before measuring. For this reason, it takes a long time to obtain the measurement values of the characteristic parameters at each measurement point. Further, in order to make the matching accuracy higher, it is necessary to perform measurement at a larger number of measurement points within a certain range, so that the total man-hours for the fitting operation become enormous.

  On the other hand, in order to perform the adaptation work in a shorter time (that is, in order to obtain the adaptation value), a method of creating a virtual engine model and obtaining the adaptation value using the virtual engine model has been studied. That is, for example, Patent Document 1 discloses a method for obtaining a conformity value in a transient state by creating a transient engine model based on a result of an actual machine test in a transient state, and performing a simulation using the model to obtain a conformance value. It is disclosed.

JP-A-2005-90353 JP2004-68729 JP 2002-206456 JP 2005-180196 A JP 2003-344196 A

  By the way, while the method using the virtual engine model as described above has been studied, as described above, the adaptation of the internal combustion engine generally requires an enormous amount of time and measurement man-hours. There is a demand for reducing the time and measurement man-hours required for adaptation by appropriately narrowing down the range of engine control states (i.e., engine control region) in which measurement is performed. In particular, when changes are made to the design specifications of the engine body, intake system, exhaust system, etc. for an internal combustion engine that has already been adapted, the change of the above design specifications to the characteristics of the internal combustion engine Since it is considered that there are also engine control states or areas that have a small impact, it is possible to narrow down the engine control states or areas in which measurement is performed for conformance when adapting an internal combustion engine after changing design specifications. It is considered that the time required for adaptation and the measurement man-hours can be reduced.

  The present invention has been made from the above viewpoints, and its object is related to a calibration operation for obtaining a calibration value of another internal combustion engine when a calibration value is obtained in a reference internal combustion engine. An object of the invention is to provide an internal combustion engine adapting method and apparatus capable of reducing time and measuring man-hours.

  The present invention provides a method or an apparatus for adapting an internal combustion engine as set forth in each claim as a means for solving the above-mentioned problems.

  According to the first aspect of the present invention, the same control is performed on the control parameter in each of the reference internal combustion engine and the internal combustion engine to be adapted for which the conformity value of the predetermined control parameter for the predetermined characteristic parameter is obtained. The characteristic parameter values obtained in this case are compared, and based on the comparison, an engine control state or region in which the characteristic parameter values are measured is determined in order to obtain the suitable value for the compatible internal combustion engine. A method for adapting an internal combustion engine is provided.

  By performing the same control on the control parameter in the reference internal combustion engine and the target internal combustion engine, and comparing the values of the characteristic parameters obtained in that case, engine control states or A region (that is, an engine control state or a region having characteristics different from those of the reference internal combustion engine of the target internal combustion engine) can be estimated. The engine control state or region is an engine control state or region in which the value of the characteristic parameter measured in the adaptation operation of the reference internal combustion engine cannot be used in the adaptation operation of the internal combustion engine to be adapted, This is an engine control state or region in which measurement of the value of the characteristic parameter is to be performed in order to obtain the adaptation value of the adaptation target internal combustion engine.

  As described above, according to the first aspect of the present invention, it is possible to appropriately estimate an engine control state or a region having a characteristic different from that of the reference internal combustion engine of the target internal combustion engine. It is possible to appropriately estimate the engine control state or region in which the measurement of the value of the characteristic parameter is to be performed in order to obtain the adaptation value of the adaptation target internal combustion engine. Therefore, according to the first aspect of the present invention, the engine control state or region in which the measurement of the characteristic parameter value is measured in order to obtain the adaptive value can be appropriately determined. In the case where the conforming value is obtained, the unnecessary measurement for obtaining the conforming value of the adaptable internal combustion engine is suppressed, and the time required for the conforming work and the measurement man-hour can be reduced. Specifically, for example, when there is a change in the design specifications for an internal combustion engine that has already been adapted, the time and measurement man-hours required for the adaptation work of the internal combustion engine in which the design specifications have been changed are calculated. Can be reduced.

  According to a second aspect of the present invention, in the first aspect of the invention, the characteristic parameter values for the reference internal combustion engine and the adaptation target internal combustion engine used in the comparison are the reference internal combustion engine and the reference internal combustion engine, respectively. It is a transient value of the characteristic parameter measured while changing at least one value of the control parameter in a predetermined pattern in each of the target internal combustion engines.

  When the transient value of the characteristic parameter (that is, the value obtained by transient measurement) is used in the comparison, the value of the characteristic parameter used in the comparison can be obtained more efficiently than when the steady value is used. Therefore, it becomes easy to compare the characteristics of the internal combustion engine with higher accuracy and in a wider engine control region. Therefore, according to the second aspect of the present invention, the engine control state or region in which the measurement of the characteristic parameter value should be performed more efficiently and more efficiently in order to obtain the conforming value of the conforming target internal combustion engine. It is possible to estimate appropriately. For this reason, according to the second aspect of the present invention, when the conforming value in the reference internal combustion engine is obtained, the time required for the conforming operation of the conforming internal combustion engine and the measurement man-hour can be more efficiently reduced. In addition, it is possible to plan appropriately.

  According to a third aspect of the invention, in the second aspect of the invention, the transient value of the characteristic parameter is measured while changing at least one value of the control parameter at a constant speed.

  By doing so, the characteristics of the internal combustion engine can be easily and accurately compared. As a result, it is possible to easily and appropriately estimate the engine control state or region in which the measurement of the characteristic parameter value is to be performed in order to obtain the adaptation value of the adaptation target internal combustion engine. Therefore, according to the third aspect of the present invention, when the conforming value in the reference internal combustion engine is obtained, it is possible to easily reduce the time required for the conforming operation of the conforming internal combustion engine and the measurement man-hours. We can plan appropriately.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, an engine control state or region in which the characteristic parameter value is measured in order to obtain the conforming value for the conforming internal combustion engine. Is an engine control state in which the difference in the value of the characteristic parameter obtained when the same control is performed on the control parameter in each of the reference internal combustion engine and the adaptation target internal combustion engine is equal to or greater than a predetermined reference difference or It is determined using a support vector machine based on the region.

  By using the support vector machine, it is possible to more appropriately estimate the engine control state or region in which the measurement of the characteristic parameter value is to be performed in order to obtain the adaptation value of the adaptation target internal combustion engine. For this reason, according to the invention described in claim 4, when the conforming value in the reference internal combustion engine is obtained, the time required for the conforming operation of the conforming internal combustion engine and the measurement man-hour can be more appropriately reduced. Can be planned.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, the engine operating state that is a specific engine control state or region is determined in advance and is determined based on the comparison. Only the engine control state or region that is within the important operation region among the states or regions is the engine control state or region in which the value of the characteristic parameter is measured in order to obtain the conforming value for the conforming internal combustion engine. It has become so.

  According to the fifth aspect of the present invention, the engine control state or region in which the measurement of the characteristic parameter value is performed in order to obtain the adaptive value in consideration of the importance of the engine control state or region is determined. Therefore, when the conforming value for the reference internal combustion engine is obtained, only the measurement particularly necessary for obtaining the conforming value for the conforming internal combustion engine is performed, and the time required for the conforming work is increased. In addition, the measurement man-hours can be further reduced.

According to the sixth aspect of the present invention, the same control is performed for the control parameter in each of the reference internal combustion engine and the internal combustion engine to be adapted for which the conformity value of the predetermined control parameter for the predetermined characteristic parameter is obtained. A means for comparing the value of the characteristic parameter obtained in the case of the engine, and an engine control state or region in which the value of the characteristic parameter is measured in order to obtain the compatible value for the target internal combustion engine based on the comparison And means for determining the internal combustion engine.
The invention described in claim 6 can provide substantially the same operations and effects as those of the invention described in claim 1.

In the invention according to claim 7, in the invention according to claim 6, the value of the characteristic parameter for each of the reference internal combustion engine and the target internal combustion engine used in the comparison is the reference internal combustion engine and the reference internal combustion engine. It is a transient value of the characteristic parameter measured while changing at least one value of the control parameter in a predetermined pattern in each of the target internal combustion engines.
The invention described in claim 7 can provide substantially the same operations and effects as those of the invention described in claim 2.

According to an eighth aspect of the invention, in the seventh aspect of the invention, the transient value of the characteristic parameter is measured while changing at least one value of the control parameter at a constant speed.
The invention described in claim 8 can provide substantially the same operations and effects as those of the invention described in claim 3.

The invention according to claim 9 is the invention according to any one of claims 6 to 8, wherein the means for comparing the values of the characteristic parameters is the control parameter for each of the reference internal combustion engine and the conforming internal combustion engine. An engine control state or region in which the difference between the characteristic parameter values obtained when the same control is performed is greater than or equal to a predetermined reference difference, and the measurement of the characteristic parameter value is performed. The means for determining the value of the characteristic parameter to obtain the adaptive value for the internal combustion engine to be applied based on the engine control state or region in which the difference in value of the characteristic parameter is greater than or equal to a predetermined reference difference. The engine control state or region in which the measurement is performed is determined using a support vector machine.
The invention described in claim 9 can provide substantially the same operations and effects as those of the invention described in claim 4.

According to a tenth aspect of the present invention, in the invention according to any of the sixth to ninth aspects, the engine parameter is determined based on the comparison by the means for determining an engine control state or a region in which the measurement of the characteristic parameter value is performed. Among the engine control states or regions, only the engine control state or region within a predetermined important operation region is measured for the characteristic parameter value in order to obtain the conformity value for the conforming internal combustion engine. A means for re-determining the engine control state or region is further provided.
Also, the invention described in claim 10 can obtain substantially the same operation and effect as the invention described in claim 5.

  The invention described in each claim can reduce the time and the measurement man-hour required for the calibration work for obtaining the calibration value of another internal combustion engine when the calibration value is obtained in the reference internal combustion engine. It has the common effect of being able to.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an internal combustion engine (that is, an internal combustion engine to be adapted) that is a target of the adaptation work and a measurement calculation device that is used for the adaptation work.

  Referring to FIG. 1, 1 is an engine body, 2 is a cylinder block, 3 is a piston that reciprocates in the cylinder block 2, 4 is a cylinder head fixed on the cylinder block 2, and 5 is a piston 3 and a cylinder head 4. A combustion chamber formed therebetween, 6 is an intake valve, 7 is an intake port, 8 is an exhaust valve, and 9 is an exhaust port. As shown in FIG. 1, a spark plug 10 is arranged at the center of the inner wall surface of the cylinder head 4, and a fuel injection valve 11 is arranged around the inner wall surface of the cylinder head 4. A cavity 12 extending from the lower side of the fuel injection valve 11 to the lower side of the spark plug 10 is formed on the top surface of the piston 3.

  The intake port 7 of each cylinder is connected to a surge tank 14 via a corresponding intake branch pipe 13, and the surge tank 14 is connected to an intake pipe 15. A throttle valve 18 driven by a step motor 17 is disposed in the intake pipe 15. On the other hand, the exhaust port 9 of each cylinder is connected to an exhaust manifold 19. Further, the intake valve 6 is provided with a variable valve mechanism 20 for changing the on-off valve characteristics of the intake valve 6, that is, the phase angle and the operating angle of the on-off valve.

  In general, the control of the internal combustion engine as shown in FIG. 1 is performed so as to satisfy the requirements for torque, exhaust emission, fuel consumption, etc. that change during operation of the internal combustion engine, that is, actual torque, exhaust emission, fuel consumption, etc. This is performed by changing the values of controllable parameters (that is, control parameters) that affect the operating state of the internal combustion engine so that the target torque, the target exhaust emission, the target fuel consumption, and the like are achieved.

  Such a control parameter has an optimum value for each operating state determined by, for example, the engine speed in accordance with a request for the internal combustion engine at that time. For example, with respect to the ignition timing by the spark plug 10, in consideration of the torque, fuel consumption, misfire, etc. of the internal combustion engine, generally, ignition is performed near the minimum advance timing at which the torque becomes the maximum, so-called MBT (Minimum Advance for Best Torque). Is preferably performed. This MBT is not the same for all operating states. For example, when the engine speed is different, the MBT is also at a different time. On the other hand, when it is necessary to increase the temperature of a catalyst (not shown) provided in the exhaust system of the internal combustion engine for exhaust purification of the internal combustion engine, the exhaust gas discharged from the engine body 1 In order to increase the temperature, it is preferable to perform ignition at a timing that is somewhat retarded from the MBT.

  Since it is difficult to calculate the optimum value (that is, the conforming value) of each control parameter for each operating state in accordance with the demand for such an internal combustion engine by only numerical calculation, usually, for each type of internal combustion engine Required by calibration work. Here, the conforming work is a characteristic parameter (a parameter whose value can be changed by changing the value of the control parameter, for each control parameter value, by setting a specific control parameter to various values. This means an operation of measuring the values of parameters representing the characteristics of the control parameters, and obtaining the optimum values (that is, conforming values) of the control parameters for the respective operating states from the measured values of these characteristic parameters.

  FIG. 1 shows a measurement calculation device 40 that measures the value of a characteristic parameter of the internal combustion engine and performs a necessary calculation in addition to the target internal combustion engine. As shown in the figure, a throttle opening sensor 31 for measuring the opening degree of the throttle valve 18 is attached to the throttle valve 18 and flows through the intake pipe 15 for the internal combustion engine to be subjected to the adaptation work. An air flow meter 32 for measuring the flow rate of air is mounted in the intake pipe 15 upstream of the throttle valve 18. Further, an exhaust gas temperature sensor 33 for measuring the temperature of the exhaust gas discharged from the engine body 1 and an air-fuel ratio sensor 34 for measuring the air-fuel ratio of the exhaust gas discharged from the engine body 1 are attached to the exhaust port or the exhaust manifold 19. . Further, a torque sensor (not shown) for detecting a generated torque that is a driving force of the internal combustion engine is attached to a crankshaft (not shown) of the engine body 1. These sensors are connected to the measurement calculation device 40, and the measurement calculation device 40 displays, saves, and calculates the values of the characteristic parameters measured by these sensors.

  On the other hand, the ignition plug 10, the fuel injection valve 11, the step motor 17 for driving the throttle valve, the variable valve mechanism 20, and the like described above are connected to the measurement arithmetic device 40, and these ignition plugs 10 are driven by the measurement arithmetic device 40. Be controlled. That is, the value of the control parameter is changed by the measurement arithmetic device 40.

  By the way, the measurement of the values of various characteristic parameters in the adaptation work is usually performed at each measurement point with various control parameters set as described above. Here, a measurement point is specified by a combination of setting values of each control parameter, and one measurement point corresponds to one combination of setting values for each control parameter. That is, each set measurement point corresponds to each engine control state that is the state of the internal combustion engine specified by the combination of the values of the control parameters. And such a measurement point is set in the adaptation area | region which is the range (engine control area | region) of the engine control state defined beforehand.

  In general, at each measurement point, it is necessary to determine the value of the characteristic parameter during steady operation (that is, the steady value of the characteristic parameter). Therefore, the operation is performed for each measurement point set by changing the value of the control parameter. Measurement is performed after waiting until the state is stabilized, that is, until the torque and engine speed converge to a substantially constant value, for example. For this reason, it takes a long time to obtain the measured value of the characteristic parameter at each measurement point. Further, in order to increase the adaptation accuracy, it is necessary to increase the number of measurement points in a predetermined engine control region, so that the measurement man-hour for the entire adaptation operation becomes enormous.

  As described above, the adaptation of the internal combustion engine generally requires an enormous amount of time and measurement man-hours. Therefore, the range of the engine control state (that is, the engine control region) in which the measurement for the adaptation is performed is appropriately narrowed down to the adaptation. There is a need to reduce such time and measurement man-hours. In particular, when changes are made to the design specifications of the engine body, intake system, exhaust system, etc. for an internal combustion engine that has already been adapted, the change of the above design specifications to the characteristics of the internal combustion engine Since it is considered that there is also an engine control state or area (hereinafter simply referred to as “engine control area”) that has a small influence, the engine control area that performs measurement for conformity when adapting the internal combustion engine after changing the design specifications It is considered that the time required for adaptation and the measurement man-hour can be reduced by doing so.

  In this embodiment, from the above viewpoint, the measurement calculation device 40 performs a method as described below to reduce the time and the measurement man-hour required for the calibration work for obtaining the calibration value of the internal combustion engine. I try to plan. In other words, according to the present embodiment, more specifically, in the case where the reference value is obtained in the reference internal combustion engine, the time and the measurement man-hour required for the adjustment work for obtaining the suitable value of another internal combustion engine are reduced. Is planned.

  In a simple manner, the method implemented by the measurement calculation device 40 in the present embodiment is a reference internal combustion engine and a target internal combustion engine for which a conformity value of a predetermined control parameter is determined for a predetermined characteristic parameter. And comparing the values of the characteristic parameters obtained when the same control is performed for the control parameters, and based on the comparison, in order to obtain the adaptive values for the internal combustion engine to be adapted, This is to determine the engine control region in which the value is measured.

  Hereinafter, this method implemented in the present embodiment will be described more specifically with reference to FIG. FIG. 2 is a flowchart showing a method implemented in this embodiment for determining an engine control region in which the value of a characteristic parameter is measured in order to obtain a conforming value for the conforming internal combustion engine.

  As shown in the flowchart of FIG. 2, when this method starts, first, in step 101, the target control parameter Xa and characteristic parameter Y are selected. That is, it determines which control parameter suitable value is to be obtained for which characteristic parameter. The target control parameter Xa selected here is preferably one that can be directly controlled by the measurement calculation device 40. This is because it is preferable that the value of the target control parameter Xa can be accurately controlled when the transient value of the target characteristic parameter Y is measured in the next step 103.

  More specifically, examples of the target control parameter Xa that can be selected here include throttle opening, fuel injection amount, on-off valve characteristics of the intake valve 6, ignition timing, engine speed, and the like. In other embodiments, when the on / off valve characteristics of the exhaust valve 8 are variable, the on / off valve characteristics of the exhaust valve 8 may be selected as the target control parameter Xa. On the other hand, examples of the target characteristic parameter Y include exhaust gas temperature, torque, fuel consumption, and the like.

  When the target control parameter Xa and the target characteristic parameter Y are selected in step 101, the process proceeds to step 103. In step 103, the transient value of the target characteristic parameter Y is measured.

  This measurement is performed in the engine control state specified by the combination of the values of the respective control parameters excluding the target control parameter Xa (that is, the values of control parameters other than the target control parameter Xa are fixed). This is performed by measuring the value of the target characteristic parameter Y while changing the value of the parameter Xa in a predetermined pattern. In the present embodiment, the measurement of the transient value of the target characteristic parameter Y is performed while changing the value of the target control parameter Xa at a constant speed.

  FIG. 3 shows that when there is Xb as a control parameter other than the target control parameter Xa, the value of the control parameter Xb is set to a constant value Xb1, and the target characteristic parameter is increased while increasing the value of the target control parameter Xa at a constant speed. The time-dependent change of the value of the target control parameter Xa and the target characteristic parameter Y when the value of Y is measured is shown. In this figure, the horizontal axis indicates time t and is a transient value obtained by measuring the value of the target characteristic parameter Y indicated by the solid line Ya.

  When the transient value Ya (Xa) of the target characteristic parameter Y is measured in step 103, the process proceeds to step 105. In step 105, the transient value data Ya (Xa) measured in step 103 is compared with the transient value data Yb (Xa) of the reference internal combustion engine measured in advance and stored in the measurement arithmetic unit 40. .

  In other words, the internal combustion engine that is the subject of the adaptation work in the present embodiment is the engine body, intake system, exhaust system, etc. that have undergone some design changes with respect to the already adapted internal combustion engine. More specifically, for example, one or more of the operating angle, the maximum lift amount, the opening / closing timing, the exhaust amount, the compression ratio, the fuel injection system, and the like are changed. Here, the internal combustion engine that has already been adapted is used as the reference internal combustion engine, and the calibration value for the reference internal combustion engine and the data obtained in the adaptation work are stored in the measurement arithmetic unit 40. Also for this reference internal combustion engine, the transient value of the target characteristic parameter Y is measured in the same manner as described in step 103 above, and the transient value data Yb (Xa) is also measured by the upper air measurement calculation device. 40.

  In step 105, the transient value data Ya (Xa) and the transient value data Yb (Xa) are compared. More specifically, in this step 105, the difference ΔY (Xa) between the transient value data Ya (Xa) and the transient value data Yb (Xa) (that is, | Ya (Xa) −Yb (Xa) |). Is now required.

  FIG. 4 is a view similar to FIG. 3, and is obtained by adding transient value data Yb (Xa) of the target characteristic parameter Y measured in the reference internal combustion engine to FIG. That is, the value of the target characteristic parameter Y indicated by the solid line Yb is a constant speed as shown in the figure with the control parameter Xb set to the constant value Xb1 in the reference internal combustion engine. This is the value (transient value) of the target characteristic parameter Y in the case of measuring while increasing the value. As is apparent from the above description, the difference between the value of the solid line Ya and the value of the solid line Yb is the difference ΔY (Xa) between the transient value data Ya (Xa) and the transient value data Yb (Xa). It becomes.

  When the difference ΔY (Xa) is obtained at step 105, the routine proceeds to step 107. In step 107, it is determined whether or not the difference ΔY (Xa) is greater than or equal to a predetermined reference difference Dc. Here, for example, if the difference ΔY (Xa) is equal to or larger than the reference difference Dc, it is necessary to measure the target characteristic parameter Y again in order to obtain an appropriate value of the target control parameter Xa with respect to the target characteristic parameter Y. It is a value considered to be and is obtained in advance by simulation or experiment.

  When it is determined in step 107 that the difference ΔY (Xa) is greater than or equal to a predetermined reference difference Dc according to the value of the target control parameter Xa, the value is set to 1 (step 109). When it is determined that the difference ΔY (Xa) is less than a predetermined reference difference Dc, the value is set to 0 (step 111).

  FIG. 5 is a diagram showing the relationship between the value of the target control parameter Xa obtained based on FIG. 4 and the difference ΔY. According to this figure, when the value of the target control parameter Xa is between Xa1 and Xa2, the difference ΔY (Xa) is not less than the reference difference Dc, and the value of the target control parameter Xa is other than that. The difference ΔY (Xa) is less than the reference difference Dc. Therefore, in this example, the difference ΔY (Xa) = 1 when the value of the target control parameter Xa is between Xa1 and Xa2, and the difference ΔY (Xa) when the value of the target control parameter Xa is other than that. = 0.

  FIG. 6 summarizes data obtained by performing the above-described procedure by changing the value of the control parameter Xb by a constant value. As can be seen from the data when the value of the control parameter Xb is Xb1, in the figure, the part on the solid line is the engine control region where the difference ΔY (Xa) is 1, and the part on the dotted line is the difference. This is an engine control region in which ΔY (Xa) is zero.

  In Step 113 following Step 109 and Step 111, the difference ΔY (Xa) is set to be equal to or larger than the reference difference Dc using a support vector machine based on the data obtained and processed up to Step 109 and Step 111. The engine control region Ga is estimated. FIG. 7 is a diagram showing a case where an engine control region Ga in which the difference ΔY (Xa) is equal to or larger than the reference difference Dc is estimated using a support vector machine based on the data shown in FIG. . Since the support vector machine is considered to be already known, a detailed description thereof will be omitted here.

  When the engine control region Ga is estimated in step 113, the process proceeds to step 115, in order to obtain a conforming value of the target control parameter Xa with respect to the target characteristic parameter Y in the measurement execution region Ma, that is, the conforming target internal combustion engine. An engine control region in which the target characteristic parameter Y is measured is determined. In the present embodiment, the engine control area Ga estimated in step 113 is directly used as the measurement execution area Ma.

  In the present embodiment, the measurement for the adaptation is performed only in the measurement execution area Ma determined here, and the data for the reference internal combustion engine is used for the other engine control areas, and the adaptation for the internal combustion engine to be adapted is performed. Is to be done.

  As described above, in the present embodiment, the target control parameter Xa is the same in each of the reference internal combustion engine for which the adaptive value of the target control parameter Xa for the target characteristic parameter Y is obtained and the compatible internal combustion engine. The value of the target characteristic parameter Y obtained when the control is performed is compared, and based on the comparison, the value of the target characteristic parameter Y is measured in order to obtain the compatible value for the compatible target internal combustion engine. The engine control region (that is, the measurement execution region Ma) to be determined is determined.

  The same control is performed on the target control parameter Xa between the reference internal combustion engine and the compatible target internal combustion engine, and the values of the target characteristic parameter Y obtained in that case are compared, whereby the characteristics of the two internal combustion engines differ. The engine control area can be estimated. Such an engine control region is an engine control region in which the value of the target characteristic parameter Y measured in order to obtain the adaptation value in the adaptation operation of the reference internal combustion engine in the adaptation operation of the adaptation target internal combustion engine cannot be used. The engine control region in which the value of the target characteristic parameter Y is to be measured in order to obtain the compatible value of the compatible target internal combustion engine.

  For this reason, according to the present embodiment, it is possible to appropriately estimate an engine control region having characteristics different from those of the reference internal combustion engine of the adaptation target internal combustion engine. In order to obtain the value, it is possible to appropriately estimate the engine control region in which the value of the target characteristic parameter Y is to be measured. For this reason, according to the present embodiment, the measurement execution area Ma can be appropriately determined. Therefore, in the case where the adaptation value in the reference internal combustion engine is obtained, the adaptation value of the adaptation target internal combustion engine is obtained. Therefore, the unnecessary measurement for the measurement is suppressed, and the time required for the fitting work and the measurement man-hour can be reduced. That is, more specifically, in the case where there is a change in the design specifications for an internal combustion engine that has already been adapted, as in the present embodiment, for the adaptation work of the internal combustion engine in which the design specifications have been changed. Such time and measurement man-hours can be reduced.

  In the present embodiment, the value of the target characteristic parameter Y for each of the reference internal combustion engine and the adaptation target internal combustion engine used in the comparison is the same for each of the reference internal combustion engine and the adaptation target internal combustion engine. The characteristic parameter Y is a transient value measured while changing the value of the target control parameter Xa in a predetermined pattern.

  If the transient value of the target characteristic parameter Y (that is, the value obtained by transient measurement) is used in the comparison, the value of the target characteristic parameter Y used in the comparison is more efficient than the case where a steady value is used. Therefore, it is easy to compare the characteristics of the internal combustion engine with higher accuracy and in a wider engine control region. Therefore, according to the present embodiment, the engine control region in which the value of the target characteristic parameter should be measured in order to obtain the compatible value of the compatible target internal combustion engine is estimated more efficiently and more appropriately. Is possible. For this reason, according to the present embodiment, when the conforming value in the reference internal combustion engine is obtained, the time required for the conforming operation of the conforming internal combustion engine and the reduction of measurement man-hours can be reduced more efficiently and appropriately. Can be aimed at.

  In particular, in the present embodiment, the transient value of the target characteristic parameter Y is measured while changing the value of the target control parameter Xa at a constant speed. In this way, the characteristics of the internal combustion engine can be easily and accurately compared. Therefore, the engine control that should measure the value of the target characteristic parameter Y in order to obtain the compatible value of the target internal combustion engine. The region can be estimated easily and appropriately. For this reason, according to the present embodiment, it is possible to easily and appropriately reduce the time and the measurement man-hour required for the adaptation work of the adaptation target internal combustion engine.

  As described above, in the present embodiment, the transient value of the target characteristic parameter Y is used in the comparison. However, the present invention is not limited to this, and the target characteristic parameter Y in the comparison is not limited thereto. The steady value may be used.

  In the present embodiment, the measurement execution region Ma is the target characteristic parameter Y obtained when the same control is performed on the target control parameter Xa in each of the reference internal combustion engine and the compatible internal combustion engine. A value difference ΔY is determined using a support vector machine based on an engine control region where the reference difference Dc is equal to or greater than the reference difference Dc.

  By using the support vector machine, it is possible to more appropriately estimate the engine control region in which the value of the characteristic parameter is to be measured in order to obtain the conforming value of the conforming target internal combustion engine. Can be determined more appropriately. For this reason, according to this embodiment, when the said conformity value in the said reference | standard internal combustion engine is calculated | required, reduction of the time concerning the adaptation operation | work of the said adaptation object internal combustion engine and a measurement man-hour can be aimed at more appropriately. .

  Next, another embodiment of the present invention will be described. FIG. 8 is a flowchart showing a method performed to determine the measurement execution area Ma in this embodiment. Note that steps 201, 203, 205, 207, 209, 211, and 213 in FIG. 8 are the same as steps 101, 103, 105, 107, 109, 111, and 113 in FIG. Then, explanation is omitted.

  This embodiment is common to most of the embodiments described above, but differs in that a predetermined important operation region is taken into account when determining the measurement execution region Ma. That is, in this embodiment, in step 214 of FIG. 8, the engine control area Ga estimated using the support vector machine in step 213 is compared with the predetermined important operation area Ja.

  Here, the important operation region Ja is a specific engine control region, and more specifically, an engine control region that affects important performance (for example, fuel consumption, maximum torque, emission, etc.) of the internal combustion engine. In the present embodiment, such an engine control region is obtained in advance, and is determined in advance as the important operation region Ja and stored in the measurement arithmetic device 40. In more detail, in step 214, the engine control area Ga and the important operation area Ja are compared, and an engine control area included in both is obtained.

  When the engine control area included in both the engine control area Ga and the important operation area Ja is determined in step 214, the process proceeds to step 215, and the measurement execution area Ma is determined. In the present embodiment, the engine control area included in both the engine control area Ga and the important operation area Ja obtained in step 214 is set as the measurement execution area Ma.

  FIG. 9 shows an example of the relationship between the engine control region Ga, the important operation region Ja, and the measurement execution region Ma in the present embodiment, where the control parameters are Xa and Xb. The hatched portion is the measurement execution area Ma.

  In the present embodiment, the measurement for the adaptation is performed only in the measurement execution area Ma determined in step 215, and the data for the reference internal combustion engine is used for the other engine control areas for the above-mentioned internal combustion engine to be adapted. Adaptation is to be made.

  As described above, in the present embodiment, the important operation region Ja, which is a specific engine control region, is determined in advance, and the engine control region is determined based on the characteristic comparison between the compatible internal combustion engine and the reference internal combustion engine. Only the engine control area within the important operation area Ja of Ga is set as the measurement execution area Ma.

  In this embodiment, the measurement execution area Ma is determined in consideration of the importance of the engine control area. Therefore, when the adaptation value in the reference internal combustion engine is obtained, the adaptation target is determined. Only the measurement that is particularly necessary for obtaining the conforming value of the internal combustion engine is performed, and it is possible to further reduce the time required for the conforming work and the measurement man-hours.

  In the above description, the description and illustration have been made on the assumption that there are two control parameters for the sake of simplicity and understanding. However, the present invention is not limited to this, and the related control parameters are not limited thereto. Even if there is more, it can be applied.

FIG. 1 shows an internal combustion engine (ie, an internal combustion engine to be adapted) that is a target of the adaptation work and a measurement calculation device that is used for the adaptation work. FIG. 2 illustrates a method implemented in one embodiment of the present invention to determine an engine control region (that is, a measurement execution region) in which a value of a characteristic parameter is measured in order to obtain a suitable value for a target internal combustion engine. It is a flowchart to show. FIG. 3 shows temporal changes in the values of the target control parameter Xa and the target characteristic parameter Y when the value of the target characteristic parameter Y is measured while increasing the value of the target control parameter Xa at a constant speed. That is, Ya in the figure is transient value data of the target characteristic parameter Y measured in the applicable target internal combustion engine. FIG. 4 is a view similar to FIG. 3, and is obtained by adding transient value data Yb of the target characteristic parameter Y measured in the reference internal combustion engine to FIG. FIG. 5 is a diagram showing the relationship between the value of the target control parameter Xa obtained based on FIG. 4 and the difference ΔY between the transient value data Ya and the transient value data Yb. FIG. 6 is a summary of the data shown in FIG. 5 obtained by changing the value of the control parameter Xb by a constant value. FIG. 7 is a diagram showing a case where the engine control region Ga in which the difference ΔY is equal to or larger than the reference difference Dc is estimated using a support vector machine based on the data shown in FIG. FIG. 8 is a flowchart illustrating a method performed to determine a measurement execution area in another embodiment of the present invention. FIG. 9 is an example when the relationship between the engine control region Ga, the important operation region Ja, and the measurement execution region Ma is illustrated with the control parameters Xa and Xb.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine body 6 Intake valve 8 Exhaust valve 10 Spark plug 11 Fuel injection valve 18 Throttle valve 31 Throttle opening sensor 32 Air flow meter 33 Exhaust temperature sensor 34 Air-fuel ratio sensor 40 Measurement arithmetic device

Claims (10)

  The characteristic parameter obtained when the same control is performed for the control parameter in each of the reference internal combustion engine and the target internal combustion engine for which the adaptive value of the predetermined control parameter for the predetermined characteristic parameter is obtained. A method for adapting an internal combustion engine, wherein values are compared, and an engine control state or region in which measurement of the value of the characteristic parameter is performed to determine the adapt value for the engine to be adapted is determined based on the comparison.   The value of the characteristic parameter for each of the reference internal combustion engine and the adaptation target internal combustion engine used in the comparison is at least one value of the control parameter for each of the reference internal combustion engine and the adaptation target internal combustion engine. The method for adapting an internal combustion engine according to claim 1, which is a transient value of the characteristic parameter measured while changing the value in a predetermined pattern.   The method for adapting an internal combustion engine according to claim 2, wherein the transient value of the characteristic parameter is measured while changing at least one value of the control parameter at a constant speed.   The engine control state or region in which the value of the characteristic parameter is measured in order to obtain the adaptation value for the adaptation target internal combustion engine is the same for the control parameter in each of the reference internal combustion engine and the adaptation target internal combustion engine. 4. The method according to claim 1, wherein the difference is determined by using a support vector machine based on an engine control state or region in which a difference in value of the characteristic parameter obtained when the control is performed is equal to or greater than a predetermined reference difference. A method for adapting an internal combustion engine according to one item.   An important operation region that is a specific engine control state or region is predetermined, and only the engine control state or region that is within the important operation region of the engine control state or region determined based on the comparison is 5. The internal combustion engine adaptation method according to claim 1, wherein the internal combustion engine is in an engine control state or a region in which measurement of the value of the characteristic parameter is performed in order to obtain the adaptation value for the internal combustion engine to be adapted. . The characteristic parameter obtained when the same control is carried out for the control parameter in each of the reference internal combustion engine and the internal combustion engine to be matched, for which the conformity value of the predetermined control parameter for the predetermined characteristic parameter is obtained. A means of comparing values;
Means for determining an engine control state or region in which measurement of the value of the characteristic parameter is performed in order to obtain the conforming value for the conforming internal combustion engine based on the comparison;
An internal combustion engine adaptation device comprising:   The value of the characteristic parameter for each of the reference internal combustion engine and the adaptation target internal combustion engine used in the comparison is at least one value of the control parameter for each of the reference internal combustion engine and the adaptation target internal combustion engine. The internal combustion engine adaptation device according to claim 6, wherein the apparatus is a transient value of the characteristic parameter measured while changing the value in a predetermined pattern.   The internal combustion engine adaptation device according to claim 7, wherein the transient value of the characteristic parameter is measured while changing at least one value of the control parameter at a constant speed.   The difference between the values of the characteristic parameters obtained when the means for comparing the values of the characteristic parameters performs the same control for the control parameters in each of the reference internal combustion engine and the target internal combustion engine is predetermined. An engine control state or region that is greater than or equal to a reference difference is obtained, and the means for determining the engine control state or region in which measurement of the value of the characteristic parameter is performed is such that the difference in the value of the characteristic parameter is greater than or equal to a predetermined reference difference The engine control state or region for measuring the value of the characteristic parameter is determined using a support vector machine based on the engine control state or region to determine the characteristic value for the target internal combustion engine. The internal combustion engine adapting device according to any one of 6 to 8.   An engine control state that is within a predetermined critical operation region among the engine control state or region determined based on the comparison by the means for determining the engine control state or region in which the value of the characteristic parameter is measured 10. The apparatus according to claim 6, further comprising means for re-determining only the region as an engine control state or region in which measurement of the value of the characteristic parameter is performed in order to obtain the conforming value for the conforming internal combustion engine. An apparatus for adapting an internal combustion engine according to claim 1.

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