JP5146367B2 - Apparatus and method for adapting parameters to be operated of internal combustion engine - Google Patents

Description

  The present invention relates to an apparatus for adapting an operation target parameter of an internal combustion engine, and a method of adapting, for acquiring a conformity value of a plurality of operation target parameters of the internal combustion engine.

  As an example of items to be evaluated when the internal combustion engine is operated, there are emission amount of harmful substances in exhaust gas, combustion noise, fuel consumption rate and the like. Hereinafter, these amounts are referred to as “output evaluation target amounts”. By changing the fuel injection timing of the internal combustion engine, the opening degree of the EGR valve, and the like, each of the plurality of output evaluation target quantities changes. Hereinafter, a parameter that affects the above-described plurality of output evaluation target amounts by operating (changing) its value, such as the fuel injection timing and the opening degree of the EGR valve, is referred to as an “operation target parameter”.

  The values of the plurality of operation target parameters necessary for setting each of the plurality of output evaluation target amounts to be equal to or less than the corresponding target values in a certain steady operation state (the fuel injection amount and the operation speed are constant) are: In the steady operation state, it can be adapted and acquired by repeating a fitting experiment in which a plurality of operation target parameters are appropriately operated. Patent Document 1 introduces an example of a technique for acquiring each (steady) fitness value of a plurality of operation target parameters.

  Specifically, target values of a plurality of output evaluation target amounts are respectively acquired for a certain steady operation state. The actually measured values (measured values) of the plurality of output evaluation target amounts are respectively acquired. For each output evaluation target amount, a value (measurement value / target value) obtained by dividing the measured value by the target value is calculated as a score of the output evaluation target amount. The total sum of the scores of the calculated plurality of output evaluation target quantities is calculated as the score total value. Based on this score total value, a target to be operated next necessary for reducing the score total value is determined from among a plurality of operation items for a plurality of operation target parameters. An operation corresponding to the operation item to be operated is performed. Each measurement value is newly acquired with respect to the state after this operation, and a score total value is newly calculated based on the newly acquired measurement value.

  In this way, it is necessary to make each of the measured values of the plurality of output evaluation target quantities equal to or less than the corresponding target values by repeating the fitting experiment for operating the plurality of operation target parameters and reducing the total score value. Each (steady) conforming value of the operation target parameter is acquired. The above procedure is performed for each of a plurality of types of steady operation states in which adaptation is performed.

JP 2004-124935 A

  As described above, in the above-mentioned document, (measured value / target value) is used as a score of each output evaluation target amount used for calculation of the score total value. Due to this, the following two problems may occur.

  First, since the target value is on the denominator side in the score calculation formula, this output evaluation target amount is included when a target value is set to near zero or zero among a plurality of output evaluation target amounts. The score of is very large (or infinite). As a result, the sum total of the scores becomes a very large value (or infinite) regardless of the scores of the other output evaluation target quantities. For this reason, the score total value cannot be calculated to an appropriate value for adapting the values of the plurality of operation target parameters, and there arises a problem that the values of the plurality of operation target parameters cannot be adapted.

  Secondly, when the target values differ greatly among a plurality of output evaluation target amounts, the amount of change in each measured value for one operation of the operation target parameter (hereinafter referred to as “one operation”) is the same. Even so, the amount of change in each score for one operation is greatly different. Here, in order to appropriately select the operation item of the next operation target parameter to be performed in order to set each of the measurement values of the plurality of output evaluation target amounts to be equal to or less than the corresponding target values, a plurality of output evaluation target amounts In the meantime, it is considered preferable that the amount of change in each score for one operation is comparable. From such a viewpoint, there has been a demand for adjusting the amount of change of each score for one operation among a plurality of output evaluation target amounts. However, as described above, when (measured value / target value) is used as a score of each output evaluation target amount, there arises a problem that this requirement cannot be satisfied.

  The present invention has been made in order to cope with such a problem, and even when a target value is set to zero among a plurality of output evaluation target quantities, the score of the output evaluation target quantity is appropriately set. It is an object of the present invention to provide an apparatus (method) for adapting an operation target parameter of an internal combustion engine, which can be calculated and can adjust a change amount of each score for one operation among a plurality of output evaluation target amounts.

  The feature of the operation target parameter adapting apparatus according to the present invention employs ((measured value−target value) / reference value) instead of (measured value / target value) as a score of each output evaluation target amount. There is. Here, for each output evaluation target amount, the reference value is a positive value having the same dimension as the measured value and the target value.

  According to this, the amount of change of each score with respect to one operation can be adjusted by adjusting each reference value among a plurality of output evaluation target amounts. Specifically, by increasing (decreasing) the reference value for each output evaluation target amount, the change amount of the score for one operation is reduced (increased) (even if the change amount of the measured value is the same). Can do.

  In addition, the target value is on the numerator side in the score calculation formula. Therefore, even if the target value is near zero or zero, the score is not very large (or infinite) as in the case of the above document. Therefore, even if a plurality of output evaluation target quantities that include a target value set to zero are included, the score of the output evaluation target quantity can be appropriately calculated.

  In the operation target parameter adaptation device according to the present invention, the reference value is set to the average value of the absolute values of the change amounts of the output evaluation target amount obtained for each operation for each output evaluation target amount. It is preferable. According to this, the change amount of each score with respect to one operation can be adjusted to the same level (specifically, near one) among a plurality of output evaluation target amounts.

  In the operation target parameter adaptation apparatus according to the present invention, when the calculated score becomes a negative value for each output evaluation target amount (that is, when the measured value is smaller than the target value), the score is zero. It is preferable to set to. This configuration is used when the adaptation experiment is completed on the condition that the total score value becomes zero (that is, the values of the plurality of operation target parameters at that time are used as the adjustment values of the corresponding operation target parameters). Particularly effective).

  For each output evaluation target quantity, a score of zero or less (that is, the measured value is less than or equal to the target value) means that the target has been achieved, and the score is greater than zero (that is, the measured value is less than the target value). Also means that the goal has not been achieved. When there are multiple output evaluation target quantities with a score of zero or less and those with a score greater than zero, the sum of the scores is present even though there is an output evaluation target quantity for which the target has not been achieved. There is a possibility that the adaptation experiment will be completed due to zero. In addition, as long as the measured value is less than or equal to the target value, even if the measured value matches the target value (ie, score = 0), or the measured value is smaller than the target value (ie, score <0), The goal is still being achieved.

  From the above, as in the above configuration, when the calculated score becomes negative, the score is set to zero, so there is an output evaluation target amount where the target has not been achieved. Nevertheless, it is possible to prevent the occurrence of a situation where the conformance experiment is completed.

  In the operation target parameter adaptation device according to the present invention, the total score value is reduced from a plurality of (predetermined) operation items for a plurality of operation target parameters based on the current total score value. The next target to be operated is determined. An operation (one operation) corresponding to the operation item to be operated is performed. Each measurement value is newly acquired for the state after this one operation, and a score total value is newly calculated based on the newly acquired measurement value. In this way, by repeating one operation and reducing the total score value, each of the operation target parameters required to make each of the measurement values of the plurality of output evaluation target amounts equal to or less than the corresponding target values ( Steady) fit value is obtained.

  Thus, when the next target to be operated is repeatedly determined, specifically, when the latest value of the total score value is smaller than the previous value, the target to be operated is the same operation item as the previous operation item. When the latest value of the total score value is equal to or higher than the previous value, it is preferable that the operation target to be operated is determined to be an operation item different from the previous operation item (conformity policy change).

  This is because when the latest value (current value) of the score total value is smaller than the previous value, the operation corresponding to the same operation item as the previous operation item (one operation) is performed again (maintaining the compliance policy). ) The next value of the score total value is likely to be smaller than the current value. On the other hand, if the latest value (current value) of the score total value is greater than or equal to the previous value, the operation corresponding to the same operation item as the previous operation item This is based on the knowledge that if the (one operation) is performed again (when the conformity policy is maintained), the next value of the total score value is likely to be larger than the current value. When the conformity policy is changed, the next operation item may follow a predetermined operation order (and operation direction).

  In the apparatus for adapting an operation target parameter according to the present invention, one operation is repeated until the adaptation experiment is completed as described above for each of a plurality of types of steady operation states (the fuel injection amount and the operation speed are constant). Executed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of an entire system in which an apparatus for adjusting an operation target parameter (method) of an internal combustion engine according to an embodiment of the present invention is applied to a four-cylinder diesel engine. It is a flowchart which shows the flow of a process at the time of performing the adjustment method of the operation target parameter which concerns on embodiment of this invention. It is the figure which showed an example of the maintenance / change of a conformity policy when performing the adaptation method of the operation object parameter which concerns on embodiment of this invention, and the next operation item is repeatedly determined.

  FIG. 1 shows a schematic configuration of an entire system including an internal combustion engine (4-cylinder diesel engine) 10 to which an operation target parameter adaptation device according to an embodiment of the present invention is applied. This system includes an engine main body 20 including a fuel supply system, an intake system 30 for introducing gas into a combustion chamber (in a cylinder) of each cylinder of the engine main body 20, and an exhaust system for discharging exhaust gas from the engine main body 20. 40, an EGR device 50 for performing exhaust gas recirculation, and an electric control device 60.

  A fuel injection valve 21 is disposed above each cylinder of the engine body 20. Each fuel injection valve 21 is connected to a fuel injection pump 22 connected to a fuel tank (not shown) via a fuel pipe 23. The fuel injection pump 22 is electrically connected to the electric control device 60 so that the pressure (rail pressure) of the fuel injected from each fuel injection valve 21 can be adjusted by a drive signal from the electric control device 60. It has become. Each fuel injection valve 21 is electrically connected to the electric control device 60 and adjusts the amount of fuel injected from each fuel injection valve 21 (fuel injection amount) by a drive signal from the electric control device 60. It can be done.

  The intake system 30 includes an intake manifold 31 connected to a combustion chamber of each cylinder of the engine body 20, an intake pipe 32 connected to an upstream side assembly of the intake manifold 31 and constituting an intake passage together with the intake manifold 31, an intake pipe A throttle valve 33 rotatably held in the throttle 32, a throttle valve actuator 33a for rotating the throttle valve 33 in response to a drive signal from the electric control device 60, and an intake pipe 32 upstream of the throttle valve 33. The mounted intercooler 34, the compressor 35a of the supercharger 35, and the air cleaner 36 disposed at the tip of the intake pipe 32 are included.

  The exhaust system 40 includes an exhaust manifold 41 connected to each cylinder of the engine body 20, an exhaust pipe 42 connected to a downstream gathering portion of the exhaust manifold 41, and a turbine of the supercharger 35 disposed in the exhaust pipe 42. 35b, and a diesel particulate filter (DPNR) 43 interposed in the exhaust pipe 42. The exhaust manifold 41 and the exhaust pipe 42 constitute an exhaust passage. A variable nozzle 35b1 for adjusting the capacity of the turbine 35b is provided in the turbine 35b. The variable nozzle 35b1 can change the capacity of the turbine 35b in response to a drive signal from the electric control device 60.

  The EGR device 50 includes an exhaust recirculation pipe 51 that constitutes a passage for recirculating exhaust gas (EGR passage), an EGR control valve 52 interposed in the exhaust recirculation pipe 51, and an EGR cooler 53. The exhaust gas recirculation pipe 51 communicates the upstream exhaust passage (exhaust manifold 41) of the turbine 35b and the downstream intake passage (intake manifold 31) of the throttle valve 33. The EGR control valve 52 can change the exhaust gas amount (exhaust gas recirculation amount, EGR gas flow rate, EGR rate) recirculated in response to a drive signal from the electric control device 60. In the present example, the EGR rate refers to the ratio of the EGR gas flow rate to the total gas flow rate (fresh air flow rate + EGR gas flow rate) flowing into the combustion chamber.

  The electric control device 60 includes a CPU 61 connected by a bus, a ROM 62, a RAM 63, a backup RAM 64, and an interface 65 including an AD converter that store programs executed by the CPU 61, tables (maps), constants, and the like in advance. It is a computer.

  The interface 65 is connected to a hot-wire air flow meter 71, a throttle valve opening sensor 72, an intake oxygen concentration sensor 73, a crank position sensor 74, an accelerator opening sensor 75, an EGR control valve opening sensor 76, and a water temperature sensor 77. Thus, signals from these sensors are supplied to the CPU 61.

  The interface 65 is connected to the fuel injection valve 21, the fuel injection pump 22, the throttle valve actuator 33a, the variable nozzle 35b1, and the EGR control valve 52, and sends drive signals to these in accordance with instructions from the CPU 61. It is like that.

  The hot-wire air flow meter 71 measures the mass flow rate of intake air (intake air (fresh air) amount per unit time) passing through the intake passage. The throttle valve opening sensor 72 detects the opening of the throttle valve 33. The intake oxygen concentration sensor 73 detects the concentration of oxygen contained in the gas in the intake passage downstream of the junction point between the intake manifold 31 and the exhaust gas recirculation pipe 51 (therefore, the gas sucked into the combustion chamber of the engine 10). It is supposed to be.

  The crank position sensor 74 detects an engine rotation speed that is the rotation speed of the engine 10 together with the actual crank angle. The accelerator opening sensor 75 detects the operation amount of the accelerator pedal AP. The EGR control valve opening degree sensor 76 detects the opening degree of the EGR control valve 52. The water temperature sensor 77 detects the temperature of the cooling water.

(Adaptation of operation target parameters)
As representative examples of items to be evaluated when the internal combustion engine 10 is operated, emissions of NOx, smoke (particulate matter, PM), HC, and CO, which are harmful substances contained in exhaust gas, are shown. Combustion noise, fuel consumption rate, and the like. Hereinafter, these six quantities are referred to as “output evaluation target quantities”. Typical examples of parameters that affect each of these output evaluation target quantities include the injection timing of fuel injected from the fuel injection valve 21, the opening degree of the EGR control valve 52, the opening degree of the variable nozzle 35b1, and the like. Hereinafter, these three parameters are referred to as “operation target parameters”.

  In the operation target parameter adapting apparatus (hereinafter referred to as “the present apparatus”) according to the embodiment of the present invention, which is applied to the system configured as described above, a plurality of predetermined steady operation states (fuel injection) Each of the above-described three operation target parameters necessary for setting each of the above-described six output evaluation target quantities to be equal to or less than the corresponding target values (steady-fit values). Are obtained by repeated adaptation experiments.

  Hereinafter, a method for adapting an operation target parameter according to the present apparatus will be described with reference to FIG. Hereinafter, it is assumed that the internal combustion engine 10 is maintained in one of a plurality of predetermined steady-state operating states to be adapted (that is, the fuel injection amount and the engine speed are maintained constant). To proceed.

  In step 205, target values ti of the six output evaluation target quantities are acquired (i: 1, 2,..., 5, 6). These target values ti are values corresponding to the steady operation state currently maintained. In step 210, each of the six output evaluation target quantities is actually measured, and the respective measured values di are obtained (i: 1, 2,..., 5, 6). The measured value is a value having the same dimension as the target value. These measurements are performed by one of the well-known methods.

  In step 215, each reference value bi of the six output evaluation target quantities is updated. The reference value is a value for adjusting a change amount of each score xi (described later) for one operation among the six output evaluation target amounts. The reference value is a positive value having the same dimension as the measured value and the target value. The update of the reference value will be described in detail later. In step 220, the respective scores xi of the six output evaluation target quantities are calculated (i: 1, 2, ..., 5, 6). The score xi is calculated according to the following equation (1).

  In step 225, it is determined whether or not xi is “0” or more for each of the scores xi. If it is determined “No” (that is, xi <0), in step 230 xi is It is set to “0”. As a result, the output evaluation target amount for which the target has been achieved (that is, measured value di ≦ target value ti) is xi = 0, and the target has not been achieved (that is, measured value di> target value ti). For quantity, xi> 0.

  In step 235, the total score value y is calculated as the sum of the scores xi (i: 1, 2,..., 5, 6). Therefore, when y> 0, it means that there is an output evaluation target amount that does not achieve the target, and when y = 0, it means that the target is achieved for all output evaluation target amounts. .

  In step 240, it is determined whether or not the total score value y is larger than “0”. If it is determined “No” (that is, if y = 0), the adaptation for the current steady state operation is completed. To do. That is, when the target is achieved for all the output evaluation target quantities (measured value di ≦ target value ti), the current values of the three operation target parameters are respectively acquired as corresponding steady-fit values.

  On the other hand, when it is determined as “Yes” in Step 240 (that is, when y> 0 and there is an output evaluation target amount for which the target has not been achieved), in Step 245, the total score value y is determined. It is determined whether the current value (latest value) is smaller than the previous value. Here, when it is determined as “Yes”, when the same operation (1 operation) as the previously executed operation (1 operation) is performed at step 250 (maintenance of conformity policy), it is determined as “No”. In step 255, an operation (one operation) different from the previously executed operation (one operation) is executed (conformity policy change).

  Here, “operation” means changing the value of the operation target parameter. In this apparatus, there are two operation items for each of the three operation target parameters described above. Specifically, an operation for advancing the fuel injection timing by a predetermined angle from the current value (advance angle operation), an operation for retarding the fuel injection timing by a predetermined angle from the current value (retarding operation), and the EGR control valve 52 An operation to increase the opening by a predetermined amount from the current value (EGR increase operation), an operation to decrease the opening of the EGR control valve 52 by a predetermined amount from the current value (EGR decrease operation), and the opening of the variable nozzle 35b1 to the current value There are six operation items: an operation for increasing the predetermined amount from the current value (VN increasing operation) and an operation for decreasing the opening of the variable nozzle 35b1 by a predetermined amount from the current value (VN decreasing operation).

  The “operation” in steps 250 and 255 indicates any one of these six operation items. That is, in one operation (one operation) of the operation target parameter, only one of the three operation target parameter values described above is changed by a predetermined amount.

  When the current value of the score total value y is smaller than the previous value, the process of step 250 is to perform “one operation” corresponding to the same operation item as the previous operation item again (that is, maintain the conformity policy). And) based on the knowledge that the next value of the total score value y is likely to be smaller than the current value. On the other hand, in the process of step 255, when the current value of the total score value y is larger than the previous value, when one operation corresponding to the same operation item as the previous operation item is performed again (that is, when the conformity policy is maintained), This is based on the knowledge that the next value of the total score value y is likely to be larger than the current value. In step 255, as a new operation item, for example, it is effective to reduce the output evaluation target amount in which the score xi has increased due to the previous operation (more specifically, the measured value di has increased). It is preferable that an operation item is selected.

  When it is determined as “Yes” in Step 240 (that is, when there is an output evaluation target amount for which the target has not been achieved), in Step 250 (maintenance of compliance policy) or Step 255 (change of compliance policy), “ After the “one operation” has been performed, the processing after step 210 described above is repeated again at the stage where the measured values di of the respective output evaluation target amounts are stabilized.

  Hereinafter, the update of the reference value bi in step 215 will be described. In this apparatus, every time “one operation” is performed in step 250 or 255, in step 215, the reference value bi is calculated and updated for each output evaluation target amount according to the following equation (2).

  In the above equation (2), n is the number of times “one operation” has been performed from the time when the adaptation experiment is started in the current steady state operation to the present. di (k) represents the measured value di acquired at the kth time after the start of the adaptation experiment for the current steady state operation. In particular, di (1) is a measurement acquired for the first time in an initial state in which the internal combustion engine 10 is started to be maintained in the current steady state operation state (that is, an initial state in which three operation target parameters are set to respective initial values). Value. That is, di (1) is a measurement value before the execution of the first “1 operation”. In general, the measurement value before execution of the kth “1 operation” can be expressed as di (k), and the measurement value after execution of the kth “1 operation” can be expressed as di (k + 1). Therefore, | di (k + 1) −di (k) | represents the absolute value of the amount of change in the measured value di with respect to the kth “one operation”.

  As can be understood from the above equation (2), for each output evaluation target amount, the reference value bi is the absolute amount of change in the measured value di obtained for each “one operation” (change amount resulting from “one operation”). Set to the average value. That is, the reference value bi is updated according to the above equation (2) every time a new “1 operation” is performed (that is, every time the value n increases by “1”).

  Thus, each time a new “one operation” is performed, the reference value bi is updated for each output evaluation target amount, the target value ti is constant for each output evaluation target amount, and the above ( From equation (1), it can be said that for each output evaluation target amount, the amount of change in the score xi for “one operation” is adjusted to the vicinity of “1”. That is, the amount of change in each score xi for “one operation” is adjusted to the same level among the six output evaluation target amounts.

  As described above, when it is determined as “Yes” in Step 240 (that is, when there is an output evaluation target amount that does not achieve the target), “1 operation” is performed in Step 250 or 255. In addition, for each output evaluation target amount, the new measured value di acquired in step 210, the reference value bi updated in step 215, and the target value ti (currently acquired in step 205) In step 220, the score xi is newly calculated and updated. Based on each newly calculated score xi in this way, the score total value y is updated in step 235, and the updated y is determined in step 240.

  Such a process is repeated until the updated y = 0 (that is, until the target is achieved for all the output evaluation target amounts). In this process, when y = 0 (determined as “No” in step 240), the adaptation is completed for the current steady state operation as described above. That is, the current values of the three operation target parameters are respectively acquired as the corresponding steady matching values.

  The adjustment of the operation target parameter as described above is sequentially performed for each of a plurality of types of steady operation states (the fuel injection amount and the engine speed are constant) in which the adjustment is performed. As a result, in each of the various steady operation states, each of the above-described three operation target parameters necessary for setting each of the above-described six output evaluation target amounts (measured values di) to be equal to or less than the corresponding target value ti. A fitness value is obtained.

  FIG. 3 shows an example of changes in various values when i = 1 and 2 correspond to a NOx emission amount and a fuel consumption rate, respectively, in a certain steady operation state. In FIG. 3, “operation n” represents the nth “one operation”. In this example, “advance angle operation” is performed as “operation 1” from the initial state, and the total score value y is thereby reduced. As a result, the “advance angle operation” is performed even in “operation 2” by maintaining the conformity policy, whereby the score sum value y is decreased. As a result, the “advance angle operation” is performed even in “operation 3” by maintaining the conformity policy, thereby increasing the score total value y. As a result, the “EGR increase operation” is performed instead of the “advance operation” in “operation 4” due to the change of the conformity policy. The “EGR increase operation” was selected because the increase in y is considered to be caused by an increase in NOx emission (see d1 (3) <d1 (4)), and in order to decrease NOx, EGR This is based on the fact that it is effective to increase the opening of the control valve 52.

  Then, the score total value y is decreased by the “operation 4”. As a result, “EGR increase operation” is performed even in “operation 5” by maintaining the conformity policy. In the example shown in FIG. 3, in the case of changing the conformity policy, the “item 1” after the previous execution (that is, the state before “operation 3”) is changed to “ “1 operation” (that is, “operation 4”) is executed. As a result, “1 operation” (ie, “operation 4”) after the operation item is changed from the state after execution of the previous “1 operation” (ie, the state after execution of “operation 3”) is executed. It can be expected that the evaluation sum value y after execution of “1 operation” (that is, “operation 4”) after the operation item is changed is smaller than in the case where the operation item is changed.

  As described above, according to the apparatus for adapting an operation target parameter according to the present invention, the scores xi of the plurality of output evaluation target amounts are the target value ti, the measured value di, the reference value bi, and the above (1 ) Is calculated according to the equation. Thereby, the amount of change of each score xi with respect to “one operation” can be adjusted by adjusting each reference value di among a plurality of output evaluation target amounts. In addition, in the above equation (1), the target value ti is on the numerator side. Therefore, even if the target value ti is near zero or zero, the score xi does not become a very large value (or infinite). Accordingly, even if a plurality of output evaluation target quantities whose target value ti is set to zero are included, the score xi of the output evaluation target quantity can be appropriately calculated.

  In addition, the reference value bi is updated to the average value of the absolute values of the change amounts of the measured value di obtained for each “one operation” in accordance with the above equation (2). Thereby, for each of the plurality of output evaluation target amounts, the amount of change in the score xi with respect to “1 operation” is adjusted to the vicinity of “1”. That is, the change amount of each score xi with respect to “one operation” can be adjusted to the same level among a plurality of output evaluation target amounts.

  Also, when the score xi becomes a negative value, the score xi is set to zero (see step 230 in FIG. 2). As a result, the target is not achieved (measured value di> target value ti), but the situation is such that, despite the presence of the output evaluation target amount, the total score value y = 0 and the fitting experiment is completed. Can be prevented.

  The present invention is not limited to the above embodiment, and various modifications can be employed within the scope of the present invention. For example, in the above-described embodiment, the above-described six physical quantities are employed as the output evaluation target quantities, but other physical quantities may be employed in addition to or instead of these.

  Similarly, in the above-described embodiment, the three parameters described above are employed as the operation target parameters (that is, six types of operation items are employed), but in addition to or in place of these. Other operation target parameters may be employed. As other operation target parameters, for example, the opening degree of the throttle valve 33 and the fuel injection pressure (rail pressure) may be employed.

  In the above embodiment, as one operation of the operation target parameter (“1 operation”), only one of the three operation target parameter values described above is changed by a predetermined amount. As “one operation”, two of the three operation target parameter values described above may be individually changed by a predetermined amount.

  In addition, although the diesel engine is employed as the internal combustion engine in the above-described embodiment, a spark ignition internal combustion engine (gasoline engine) may be employed.

  DESCRIPTION OF SYMBOLS 21 ... Fuel injection valve, 22 ... Pump for fuel injection, 33 ... Throttle valve, 35b ... Turbine, 35b1 ... Variable nozzle, 52 ... EGR control valve, 60 ... Electric control device, 61 ... CPU, 74 ... Crank position sensor, 76 ... EGR control valve opening sensor

Claims (6)

An evaluation target amount target value acquisition means for respectively acquiring target values of a plurality of predetermined output evaluation target amounts to be evaluated during operation of the internal combustion engine;
An evaluation target amount measurement value acquisition means for acquiring measurement values that are actually measured values of the plurality of output evaluation target amounts;
An evaluation target amount reference value acquiring means for acquiring a reference value of each of the plurality of output evaluation target amounts;
For each output evaluation target amount, a score calculation means for calculating a value obtained by subtracting the target value from the measured value and dividing the value by the reference value as a score of the output evaluation target amount;
A total score value calculating means for calculating a total score of each of the plurality of output evaluation target quantities calculated as a total score value;
A target to be operated is determined from a plurality of operation items for a plurality of operation target parameters of the internal combustion engine that affect the measured values of the plurality of output evaluation target amounts based on the score total value, and the operation is performed. Each of the output evaluation target amounts is obtained by repeating an operation corresponding to the operation item that is to be performed and causing the score total value calculating unit to newly calculate the score total value for the state after the operation. Parameter adaptation value acquisition means for respectively acquiring adaptation values of the plurality of operation target parameters necessary for setting the measured value to be equal to or less than the target value for:
An apparatus for adapting an operation target parameter of an internal combustion engine, comprising: The apparatus for adapting an operation target parameter of an internal combustion engine according to claim 1,
The evaluation target amount reference value acquisition means includes:
For each output evaluation target amount, an average of absolute values of changes in the measured value of the output evaluation target amount obtained for each operation corresponding to the operation item to be operated is used as the reference value. An apparatus for adapting an operation target parameter of an internal combustion engine configured to set a value. In the apparatus for adapting an operation target parameter of the internal combustion engine according to claim 1 or 2,
The score calculation means includes:
An apparatus for adapting an operation target parameter of an internal combustion engine configured to set the score to zero when the calculated score becomes a negative value for each output evaluation target amount. In the apparatus for adapting the operation target parameter of the internal combustion engine according to claim 3,
The parameter conformity value acquisition means is
When the score total value becomes zero, the operation target parameters of the internal combustion engine configured to use the values of the plurality of operation target parameters at that time as the corresponding values of the corresponding operation target parameters. Compatible equipment. The apparatus for adapting an operation target parameter of an internal combustion engine according to any one of claims 1 to 4,
The parameter conformity value acquisition means is
When the latest value of the total score value is smaller than the previous value, the target to be operated is determined as the same operation item as the previous operation item, and when the latest value of the total score value is greater than or equal to the previous value, the operation is performed. An apparatus for adapting an operation target parameter of an internal combustion engine configured to determine a target to be operated as an operation item different from a previous operation item. Obtaining a target value for each of a plurality of predetermined output evaluation target quantities to be evaluated during operation of the internal combustion engine,
Each of the measurement values that are actually measured values of the plurality of output evaluation target amounts are acquired,
Obtaining a reference value for each of the plurality of output evaluation target quantities;
For each output evaluation target amount, a value obtained by subtracting the target value from the measured value and dividing by the reference value is calculated as a score of the output evaluation target amount,
Calculating the sum of the respective scores of the calculated plurality of output evaluation target quantities as the score total value,
A target to be operated is determined from a plurality of operation items for a plurality of operation target parameters of the internal combustion engine that affect the measured values of the plurality of output evaluation target amounts based on the score total value, and the operation is performed. By repeating the operation corresponding to the operation item that is the target to be calculated and newly calculating the total score value for the state after the operation, the measurement value for each output evaluation target amount is set to the target A method for adapting an operation target parameter of an internal combustion engine, wherein respective adjustment values of the plurality of operation target parameters required to be less than or equal to the value are acquired.

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