JP2012225175A - Engine adaptation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the accuracy of adaptation, and to simplify adaptation work.SOLUTION: An adaptation ECU 25 performs the adaptation of an engine 10 and registers an adaptation value to a memory of an engine ECU 20. The adaptation ECU 25 calculates command values of a plurality of combustion parameters by using first correlation data in which a correlation between a plurality of performance parameters and a plurality of combustion parameters is defined, and second correlation data in which the plurality of combustion parameters and a plurality of control parameters is defined, and controls the operation of the actuator. At this point, the feedback control of the performance parameter is executed so that a difference between each performance parameter and an actual value of the performance parameter may be eliminated. Furthermore, at the adaptation of the engine, the adaptation ECU 25 determines that the actual values of the plurality of performance parameters are converged with respect to an adaptation target value under a variety of operation conditions at the adaptation, and registers the command value of the control parameter in a converged state of each performance parameter to the memory as the adaptation value.

Description

  The present invention relates to an engine adaptation device that adapts a control amount of an actuator mounted on an engine.

  Conventionally, various prior arts have been proposed as adaptation devices for engine control. For example, a plurality of operating conditions for performing adaptation are sequentially set, and performance parameters (exhaust gas) representing engine performance under each of these operating conditions. In this method, the optimum value is searched for the control parameters such as the injection amount and the injection timing while the NOx amount, the CO amount, the fuel consumption, etc.) are converged to the suitable target values. In Patent Document 1, an operation order and an operation direction of a plurality of control parameters for reducing an output value (performance parameter) exceeding a conforming target value are determined, and a control parameter is based on the operation order and the operation direction. The parameters are adapted by sequentially operating the.

JP 2006-118516 A

  However, in the above-described conventional technology, the adaptation is performed based on the relationship between the performance parameter and the control parameter. In such a configuration, when a performance parameter for a plurality of performance parameters becomes the adaptation target value, another performance parameter is set. Mutual interference (trade-off) is likely to occur, such that the distance between the target value and the target value for the adjustment becomes far from the target value, which may cause a problem in performing the adjustment. In this case, there is a limit in eliminating the mutual interference, and there is a concern that the optimum value of the control parameter is not found and re-adaptation is repeated, or the accuracy of the adaptation is lowered.

  The present invention has been made in order to solve the above-described problems, and has as its main object to provide an engine adaptation device that can improve the accuracy of adaptation and simplify the adaptation operation.

  Hereinafter, means for solving the above-described problems and the effects thereof will be described.

The invention according to claim 1 is an engine adapting device comprising adapting means for adapting the control amount of the actuator under a plurality of predetermined engine operating conditions for an engine operated by the operation of the actuator,
Performance target setting means for setting a target value of each performance parameter for a plurality of performance parameters representing the performance of the engine;
The first correlation data defining the correlation between the plurality of performance parameters and the plurality of combustion parameters representing the combustion state of the engine is used, and the plurality of performance parameters are set based on the target value of each performance parameter set by the performance target setting means. Combustion target setting means for calculating a target value of the combustion parameter of
Using the second correlation data that defines the correlation between the plurality of combustion parameters and the plurality of control parameters related to the actuator, a command for the plurality of control parameters is based on the target value of each combustion parameter set by the combustion target setting means. Control command value calculating means for calculating a value;
Control means for controlling the operation of the actuator based on command values of the plurality of control parameters calculated by the control command value calculating means;
With
The performance parameter feedback control is performed so as to eliminate the deviation between the target value of each performance parameter set by the performance target setting means and the actual value of the performance parameter,
The adapting means is
In adapting the engine, conforming condition setting means for sequentially setting the plurality of engine operating conditions;
As the target value set by the performance target setting means, conformity target setting means for setting a conformity target value that is a target value at the time of conformity for the plurality of performance parameters;
Convergence determination means for determining that actual values of the plurality of performance parameters have converged with respect to the adaptation target value under each operating condition at the time of adaptation set by the adaptation condition setting means;
Registration means for registering a command value of the control parameter in the convergence state in a predetermined memory as an appropriate value when convergence of the plurality of performance parameters is determined by the convergence determination means;
It is characterized by providing.

  In short, in the present invention, the first correlation data defining the correlation between the plurality of performance parameters and the plurality of combustion parameters is used to calculate the target values of the plurality of combustion parameters based on the target values of the respective performance parameters, and A configuration is adopted in which command values of the plurality of control parameters are calculated based on the target values of the respective combustion parameters using the second correlation data defining the correlation between the combustion parameters and the plurality of control parameters. The performance parameter feedback control is performed so as to eliminate the deviation between the target value and the actual value. In this case, the first correlation data includes, for example, performance parameters such as NOx amount, PM amount, output torque, and fuel consumption, and combustion parameters such as ignition timing, ignition start delay time, heat generation rate, and heat generation rate maximum timing. The second correlation data is obtained by associating each combustion parameter with a control parameter such as the injection timing, the injection amount, and the injection pressure in a plural-to-multiple relationship. is there. Therefore, how each performance parameter changes due to the operation of each control parameter can be defined considering not only the direct relationship between these parameters but also the combination with intermediate combustion parameters. Compared with the case where each control parameter is controlled based on direct association, mutual interference of a plurality of performance parameters can be made difficult to occur.

  It should be noted that at least a plurality of combustion parameters may be used, but it is desirable that the number of assumptions is larger. The more assumptions of the combustion parameters are, the easier it is to find a combustion parameter that is suitable for each performance parameter. It would be advantageous to find a control parameter suitable for any of the parameters.

  Then, when adapting the engine, it is assumed that the first correlation data and the second correlation data are used, and that the performance parameter feedback control is performed, and a plurality of conformity target values are obtained for each conforming operation condition. It is determined that the actual value of the performance parameter has converged, and the command value of the control parameter in a state where the convergence of the performance parameter has been determined is registered in the memory (nonvolatile memory) as an appropriate value. Therefore, it is possible to easily find out the command value of the control parameter as the conforming value while making it difficult for the plurality of performance parameters to interfere with each other. In this case, if the conforming value can be easily found, the conforming operation can be easily performed. As a result, the accuracy of adaptation can be improved and the adaptation work can be simplified.

  In the second aspect of the invention, feedback control of the combustion parameter is performed so as to eliminate a deviation between the target value of each combustion parameter set by the combustion target setting means and the actual value of the combustion parameter. .

  In this case, in addition to performance parameter feedback control, combustion parameter feedback control is also performed, and the control accuracy of the engine is improved. Therefore, it is possible to improve the accuracy of engine adaptation.

1 is a configuration diagram of an engine adaptation system in an embodiment of the invention. (A) is a block diagram showing a configuration of a combustion F / B system, (b) is a diagram showing a combustion parameter calculation formula, (c) is a diagram showing a control parameter calculation formula. The flowchart which shows a combustion F / B control process. The flowchart which shows an automatic adaptation process. The figure which shows the various maps for engine control. The time chart which shows transition of the performance parameter at the time of engine adaptation, a combustion parameter, and a control parameter. The block diagram which shows the structure of the combustion F / B system concerning 2nd Embodiment.

(First embodiment)
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings. The present embodiment embodies a technique for performing adaptation processing for various types of control related to an in-vehicle engine and registering an adaptation value obtained by the adaptation processing in an engine ECU or the like. FIG. 1 is a configuration diagram of an engine adaptation system.

  In FIG. 1, an engine 10 is an on-vehicle multi-cylinder internal combustion engine, more specifically, a four-cylinder diesel engine that injects high-pressure fuel into a plurality of cylinders # 1 to # 4 and performs compression self-ignition combustion. . The engine 10 is provided with various actuators 11 for operating the engine 10 in a desired state. Specific examples of the actuator 11 relating to the fuel system include a fuel injection valve that injects fuel to be used for combustion, and Examples thereof include a high-pressure pump that controls the pressure of fuel supplied to the fuel injection valve. Specific examples of the actuator 11 relating to the intake system include an EGR valve that controls the amount of EGR that circulates a part of the exhaust gas as EGR gas to the intake air, a variable supercharger that variably controls the supercharging pressure, Examples include a throttle valve that controls the amount of fresh air inflow, a valve control mechanism that variably controls the opening / closing timing and lift amount of the intake valve or exhaust valve.

  The engine ECU 20 is configured as an in-vehicle electronic control unit having a well-known microcomputer having a CPU 21 and various types of memory 22, and the memory 22 is software executed by the CPU 21 (refer to the program and details when executing the program). Flash memory in which data is stored) and non-rewritable ROM, RAM that temporarily stores data and computation results during computation, backup RAM that is backed up (power is always supplied), EEPROM (Electrically Erasable) Programmable Read-Only Memory). The engine ECU 20 is a so-called map-based ECU that calculates an engine control amount using a map for engine control stored in a flash memory or the like.

  Specifically, the engine ECU 20 controls the pressure of the injected fuel by outputting a command value for the amount of fuel that is sucked and discharged by the high-pressure pump to the high-pressure pump. Further, the engine ECU 20 controls the fuel injection mode by outputting to the fuel injection valve command values such as the fuel injection amount (injection time) by the fuel injection valve, the injection timing, and the number of multistage injections to be injected per combustion. . The engine ECU 20 also outputs command values such as EGR amount, supercharging pressure, fresh air inflow amount, engine valve opening / closing timing and lift amount to each of the EGR valve, variable supercharger, throttle valve, and valve control mechanism. By doing so, the engine intake system is controlled.

  Further, in the present embodiment, an appropriate value for the engine control map used by the engine ECU 20 is calculated by an ECU (compatible ECU 25) different from the engine ECU 20, and the calculated appropriate value is registered in the flash memory of the engine ECU 20. It is configured. Similar to the engine ECU 20, the compatible ECU 25 is configured as an electronic control unit having a known microcomputer including a CPU 26 and various memories 27. When the engine 10 is adapted, the engine ECU 20 and the adapted ECU 25 are connected to each other via a bidirectional communication bus 28 as illustrated. The conforming ECU 25 controls the combustion state of the engine 10 by controlling the operation of each actuator 11 when adapting the engine 10, and thus controls the engine performance. In particular, the conforming ECU 25 performs feedback control of the engine performance. To find an appropriate fit value.

  Here, the “engine combustion state” is represented by a plurality of combustion parameters. Specific examples of these combustion parameters include ignition timing, ignition start delay time (from the start of fuel injection to ignition). Time), heat generation rate, maximum time of heat generation rate, and the like. These combustion parameters (ignition timing, ignition start delay time, heat generation rate, heat generation rate maximum timing) are physical quantities that can be detected by an output signal of the in-cylinder pressure sensor, for example.

  “Engine performance” is represented by a plurality of performance parameters. Specific examples of these performance parameters include physical quantities related to exhaust emissions (eg, NOx quantity, PM quantity, CO quantity, HC quantity, etc.), and output torque. Physical quantity (for example, engine output shaft rotation torque, engine speed, etc.), fuel consumption physical quantity (for example, travel distance per consumed fuel volume, fuel consumption per operating time, etc., measured by mode tests, etc.) And physical quantities related to combustion noise (for example, engine vibration, engine noise, etc.).

  Various sensors used for engine adaptation include an engine output sensor 12 and a combustion state quantity sensor 13, and the detection values of these sensors 12 and 13 are input to the adaptation ECU 25. The engine output sensor 12 is a sensor that detects an actual value of the performance parameter described above. For example, a sensor that detects a specific component amount (NOx amount, etc.) in exhaust, a sensor that detects torque, and a combustion sound. A sensor etc. are mentioned. The combustion state quantity sensor 13 is a sensor that detects an actual value of the above-described combustion parameter. For example, an in-cylinder pressure sensor that detects the pressure in the combustion chamber (in-cylinder), and detects the amount of ions that accompany the combustion. An ion sensor etc. are mentioned. For example, based on the change in the in-cylinder pressure detected by the in-cylinder pressure sensor, the ignition timing, the ignition start delay time, and the like can be acquired.

  Sensors 12 and 13 may be on-vehicle detectors used for engine control by engine ECU 20, or may be measuring instruments for adaptation that are not mounted on vehicles but are fitted only at the time of adaptation. In this embodiment, it is set as the structure which uses the measuring instrument for a conformity as the sensors 12 and 13. FIG. The detection values of the sensors 12 and 13 may be input to the compatible ECU 25 via the engine ECU 20.

  The compatible ECU 25 has the same control target as that of the engine ECU 20, and controls the fuel pressure to be controlled by the high pressure pump and the control of the fuel injection mode to be controlled by the fuel injection valve in the same manner as the engine ECU 20. (Control of injection amount, injection timing, number of multistage injections, etc.), EGR valve, variable supercharger, throttle valve, valve control mechanism, etc. Control of the engine intake system is controlled. For each actuator 11, a control signal may be directly output from the compatible ECU 25 or may be output via the engine ECU 20.

  Next, the compatible ECU 25 will be described in detail. FIG. 2A is a block diagram showing the configuration of the combustion F / B system constructed in the compatible ECU 25, and shows the functions of the compatible ECU 25 as functional blocks.

  The conforming ECU 25 has a performance parameter calculation unit 31 (performance target setting means) that calculates target values for a plurality of performance parameters as a basic function configuration related to engine control, and how to set actual performance parameters to target values. Combustion parameter calculation unit 32 (combustion target setting means) that calculates whether the combustion state (combustion parameter) should be set, and an actuator control unit that controls the operation (control parameter) of the actuator 11 so as to achieve the target combustion state 33 (control command value calculating means), a performance parameter deviation calculating section 34 (performance feedback means) for calculating a deviation between the target value of the performance parameter and the actual value (detected value of the engine output sensor 12), and the target of the combustion parameter Parameter deviation for calculating the deviation between the actual value and the actual value (detected value of the combustion state quantity sensor 13) A detecting section 35 (combustion feedback means), and a. Each of these functional blocks 31 to 35 is realized by a microcomputer control program.

  The combustion parameter calculation unit 32 includes an integrator 32a that adds the performance parameter deviation calculated by the performance parameter deviation calculation unit 34, and first correlation data stored in a memory (storage unit) such as a ROM included in the compatible ECU 25. And a combustion parameter calculation formula 32b.

  The combustion parameter calculation expression 32b defines the correlation between a plurality of performance parameters and a plurality of combustion parameters, and is defined by, for example, a model shown in FIG. 2A or a determinant shown in FIG. . This is because “what kind of combustion state (combustion parameter) will result in what kind of engine performance (performance parameter)”, in other words “how to make the required performance parameter the combustion state It can be said that this is an arithmetic expression that defines “it is good”. Therefore, by substituting the performance parameter target value (or performance parameter change amount) into the combustion parameter calculation expression 32b, the combustion parameter target value (or combustion parameter change amount) can be obtained. In the example shown in FIG. 2A, a combustion parameter indicating how much a plurality of combustion parameters should be changed from the current values by substituting a plurality of performance parameter change amounts (deviations) into the combustion parameter calculation expression 32b. The amount of change is calculated.

  In addition, by integrating the deviation by the integrator 32a and substituting the integrated value into the combustion parameter calculation formula 32b, it is possible to suppress the occurrence of steady deviation such that the actual value of the performance parameter is constantly deviated from the target value. I am trying. When the deviation integrated value calculated by the integrator 32a becomes zero, the value (change amount of the target value) calculated by the combustion parameter calculation expression 32b becomes zero, and the target value of the combustion parameter maintains the current combustion state. It will be calculated to be a value to be made.

  The actuator control unit 33 includes an integrator 33a that adds the combustion parameter deviation calculated by the combustion parameter deviation calculation unit 35, and second correlation data stored in a memory (storage means) such as a ROM of the compatible ECU 25. The control parameter calculation formula 33b is provided.

  The control parameter calculation expression 33b defines the correlation between a plurality of combustion parameters and a plurality of control parameters, and is defined by, for example, a model shown in FIG. 2A or a determinant shown in FIG. . This is because "what kind of control parameter is used and what kind of combustion state (combustion parameter) will be obtained", in other words, "how should the control parameter be set to achieve the target combustion state"? It can be said that it is a defined arithmetic expression. Therefore, if the target value of the combustion parameter (or the amount of change in the combustion parameter) is substituted into the control parameter calculation expression 33b, the command value of the control parameter (or the amount of change in the control parameter) can be obtained. In the example shown in FIG. 2A, a command value indicating how much the plurality of control parameters should be changed from the current values by substituting a plurality of combustion parameter change amounts (deviations) into the control parameter calculation expression 33b. The amount of change is calculated.

  It should be noted that by integrating the deviation by the integrator 33a and substituting the integrated value into the control parameter calculation formula 33b, it is possible to suppress the occurrence of steady deviation such that the actual value of the combustion parameter is constantly deviated from the target value. I am trying. When the deviation integrated value calculated by the integrator 33a becomes zero, the value (control parameter change amount) calculated by the control parameter calculation expression 33b becomes zero, and the command value of the control parameter maintains the current command value. It will be calculated to be a value to be made.

  Next, a procedure (combustion F / B control process) for calculating the control parameter command value output to the actuator 11 as described above will be described with reference to the flowchart of FIG. This combustion F / B control process is repeatedly executed by the microcomputer of the compatible ECU 25 at a predetermined cycle (for example, the calculation cycle performed by the CPU described above or every predetermined crank angle).

  First, in step S11, a target value is calculated for each of a plurality of performance parameters. This process corresponds to the process executed by the performance parameter calculation unit 31. In this case, the target value of each performance parameter is preferably set in association with the engine operating state such as the engine speed and the accelerator operation amount (load) by the driver, for example, the engine speed and the accelerator operation amount. A map in which the optimum value of the performance parameter is stored in advance by a conformance test, and the target performance parameter may be calculated using the map.

  In the subsequent step S12, actual values of a plurality of performance parameters are acquired based on the detected values of the engine output sensor 12. Note that the actual value of the performance parameter may be acquired by estimation using a calculation means such as a model. In particular, for a performance parameter for which the engine output sensor 12 is not provided among a plurality of performance parameters, it is effective to substitute the estimated value as an actual value of the performance parameter.

  In subsequent step S13, a deviation (performance parameter deviation) between the target value of each performance parameter calculated in step S11 and the actual value of each performance parameter acquired in step S12 is calculated. This process corresponds to the process executed by the performance parameter deviation calculating unit 34.

  In subsequent step S14, an integral value x (i) of each deviation calculated in step S13 is calculated. Specifically, the current integration value x (i) for each of the plurality of performance parameters is calculated by adding the current performance parameter deviation to the previous integration value x (i−1). At this time, the integrated value of the deviation in the past n processes is calculated. This process corresponds to the process executed by the integrator 32a.

  In subsequent step S15, a target value is calculated for each of the plurality of combustion parameters. Specifically, the integrated value x (i) of the deviation calculated in step S13 is substituted into the combustion parameter calculation expression 32b, and a solution obtained by the substitution is calculated as a change amount of a plurality of combustion parameters. For example, the combustion parameter calculation formula 32b shown in FIG. 2B is a product of an r-dimensional column vector A1 with a deviation of a plurality of performance parameters as a variable and a matrix A2 representing q rows and r columns of coefficients a11 to aqr. Is represented as a q-dimensional column vector A3 with the change amounts of a plurality of combustion parameters as variables. Then, the solution of each variable constituting the column vector A3 is calculated by substituting the integral value x (i) of the deviation into each variable constituting the column vector A1. The solution obtained by this is the combustion parameter change amount (change amount from the current value). Also, based on engine operating conditions such as engine speed and load, the combustion parameter reference value is calculated by, for example, a map or mathematical formula, and the combustion parameter change amount is added to the reference value, and the sum is added to the new combustion The target value of the parameter is set (combustion parameter target value = reference value + combustion parameter change amount).

  In the subsequent step S16, actual values of a plurality of combustion parameters are acquired based on the detected values of the combustion state quantity sensor 13. In addition, you may make it acquire the actual value of a combustion parameter by estimation using calculation means, such as a model. In particular, for parameters for which the combustion state quantity sensor 13 is not provided among a plurality of combustion parameters, it is effective to substitute the estimated value as the actual value of the combustion parameter.

  In subsequent step S17, a deviation (combustion parameter deviation) between the target value of each combustion parameter calculated in step S15 and the actual value of each combustion parameter acquired in step S16 is calculated. This process corresponds to the process executed by the combustion parameter deviation calculation unit 35.

  In the subsequent step S18, an integral value y (i) of each deviation calculated in step S17 is calculated. Specifically, the current integration value y (i) for each of the plurality of combustion parameters is calculated by adding the current combustion parameter deviation to the previous integration value y (i-1). At this time, the integrated value of the deviation in the past n processes is calculated. This process corresponds to the process executed by the integrator 33a.

  In subsequent step S19, a command value (control parameter command value) is calculated for each of the plurality of control parameters. Specifically, the deviation integrated value y (i) calculated in step S18 is substituted into the control parameter calculation expression 33b, and a solution obtained by the substitution is calculated as a change amount of a plurality of control parameters. For example, the control parameter calculation formula 33b shown in FIG. 2C is a product of a q-dimensional column vector A4 with the deviations of a plurality of combustion parameters as variables and a matrix A5 representing the coefficients b11 to bpq of p rows and q columns. Is represented as a p-dimensional column vector A6 with the amount of change of a plurality of control parameters as a variable. Then, the solution of each variable constituting the column vector A6 is calculated by substituting the integral value y (i) of the deviation into each variable constituting the column vector A4. The solution thus obtained is the amount of change of each control parameter (the amount of change from the current value). Further, based on the engine operating conditions such as engine rotation speed and load, for example, a reference command value of the control parameter is calculated by a map or a mathematical formula, the amount of change of the control parameter is added to the reference command value, and the sum is A new control parameter command value is set (control parameter command value = reference command value + change amount of control parameter). This control parameter command value is the actuator control amount that is finally output to the various actuators 11.

  Next, the automatic adaptation process performed by the adaptation ECU 25 will be described with reference to the flowchart of FIG. This process is performed at the same time as the combustion F / B control process of FIG.

  In FIG. 4, in step S <b> 21, engine operating conditions for performing adaptation are set. At this time, the engine operating condition corresponds to each of the operating areas divided into a plurality of parts for the entire operating area of the engine 10, and for example, a plurality of engine operating conditions are respectively determined using the engine speed and the load as parameters. Yes. In step S21, one of a plurality of engine operating conditions is set.

  After that, in step S22, an adaptation target value is set for each of the plurality of performance parameters. This is a process performed by the performance parameter calculation unit 31 in FIG. When the engine is adapted, the adaptation target value set in step S22 is a target value for each performance parameter (calculated value in step S11) in the combustion F / B control of FIG. In this case, a suitable target value may be set based on each engine operating condition.

  Thereafter, in step S23, the deviation of each performance parameter is acquired. In subsequent step S24, it is determined whether or not the deviation of each performance parameter is within a predetermined value. The predetermined value is a determination value for determining the convergence of the performance parameter. In this case, the deviation of each performance parameter is calculated in steps S12 to S14 in FIG. 3, and in step S23, an integrated value x (i) of the deviation of each performance parameter is acquired.

  If step S24 is NO, the process proceeds to the subsequent step S25, and the determination in step S24 is repeatedly performed. At this time, in the combustion F / B control process of FIG. 3, the process for setting the target value of each combustion parameter (steps S <b> 12 to S <b> 15) while fixing the conformity target value of each performance parameter to the set value of step S <b> 22 And the process for calculating the command value of each control parameter (steps S16 to S19) is repeatedly performed, and accordingly, the actual value of each performance parameter gradually converges to the target value. Therefore, step S24 will eventually be YES.

  When step S24 becomes YES, the process proceeds to step S25, and the command value of each control parameter at that time, that is, the command value of each control parameter in the convergence state of the performance parameter is stored in the RAM or the like as an appropriate value.

  Thereafter, in step S26, it is determined whether or not the calculation of the adaptive value has been completed for all engine operating conditions. If it is not completed, the process returns to step S21 to newly set the engine operating condition and perform the subsequent processes (steps S22 to S26) as described above.

  If it is completed, the process proceeds to step S27, in which the adaptive value under each engine operating condition is registered in a predetermined memory (for example, a flash memory) of the engine ECU 20, and then this process is terminated. At this time, various maps for engine control are prepared in the flash memory of the engine ECU 20, and the appropriate values are registered by writing appropriate values for each operation region in each map. For example, the engine ECU 20 is provided with a plurality of maps (maps A, B, C, etc.) shown in FIG. 5, and the map A corresponds to the fuel injection amount in association with the engine speed and the load. Is registered in the map B, and an adaptive value related to the fuel injection timing is registered in association with the engine rotational speed and the load. In the map C, an adaptive value related to the injection pressure is correlated to the engine rotational speed and the load. be registered.

  FIG. 6 is a time chart showing changes in performance parameters, combustion parameters, and control parameters when the engine is adapted. Regarding performance parameters and combustion parameters, the solid line shows the transition of the target value, and the broken line shows the transition of the actual value (in these parameters, the solid line and the broken line are overlapping).

  In FIG. 6, time = 10 is a timing at which the performance parameters (EM1 to EM4) are changed, that is, a timing at which the adaptation target value is set, and then the performance parameters (EM1 to EM4) so as to follow the adaptation target value. The actual value of changes. At this time, the target values and the actual values of the plurality of combustion parameters (COMB1 to COMB4) increase and decrease as the conforming target values of the performance parameters all change simultaneously, and the plurality of control parameters (ACT1 to ACT4). Command value increases or decreases.

  In the vicinity of time = 12, the actual value of each performance parameter converges to the target value, and based on this, the command value of the control parameter in the convergence state of the performance parameter is calculated as the engine control compatible value at timing t1. (D1-D4). In short, according to the combustion F / B control of this embodiment, cooperative control is performed for a plurality of control parameters, and it is possible to easily and quickly find each control parameter that satisfies the requirements for all of the plurality of performance parameters at the same time. It becomes.

  According to the embodiment described in detail above, the following excellent effects can be obtained.

  A target value of a plurality of combustion parameters is calculated based on a target value of each performance parameter using a combustion parameter calculation expression 32b (first correlation data) that defines a correlation between the plurality of performance parameters and the plurality of combustion parameters. The control parameter calculation formula 33b (second correlation data) that defines the correlation between the combustion parameter and the plurality of control parameters is used to calculate the command values of the plurality of control parameters based on the target values of the respective combustion parameters. Furthermore, feedback control of the performance parameters is performed so as to eliminate the deviation between the target value and the actual value of each performance parameter. In such a case, how each performance parameter changes due to the operation of each control parameter can be defined considering not only the direct relationship between these parameters but also the combination with intermediate combustion parameters. As compared with the case where each control parameter is controlled based on the direct association, it is possible to make it difficult to cause mutual interference of a plurality of performance parameters.

  It should be noted that at least a plurality of combustion parameters may be used, but it is desirable that the number of assumptions is larger. The more assumptions of the combustion parameters are, the easier it is to find a combustion parameter that is suitable for each performance parameter. It would be advantageous to find a control parameter suitable for any of the parameters.

  When adapting the engine, it is assumed that the above-described arithmetic expressions 32b and 33b are used and feedback control of the performance parameter is performed. It was determined that the actual value had converged, and the command value of the control parameter in a state where the convergence of the performance parameter was determined was registered in the flash memory as an appropriate value. Therefore, it is possible to easily find out the command value of the control parameter as the conforming value while making it difficult for the plurality of performance parameters to interfere with each other. In this case, if the conforming value can be easily found, the conforming operation can be easily performed. As a result, the accuracy of adaptation can be improved and the adaptation work can be simplified.

  Since the configuration is such that the feedback control of the combustion parameter is performed in addition to the feedback control of the performance parameter, the control accuracy of the engine is improved. Therefore, it is possible to improve the accuracy of engine adaptation.

(Second Embodiment)
In the first embodiment, “a plurality of performance parameter deviations” are substituted into the combustion parameter calculation expression 32b as the first correlation data, and “amount of change in the plurality of combustion parameters” is calculated as the solution, and the second correlation is calculated. Although “a plurality of combustion parameter deviations” are substituted into the control parameter calculation formula 33b as data and “amount of change of a plurality of control parameters” is calculated as a solution (see FIG. 2), this is changed.

  That is, in the present embodiment, as shown in FIG. 7, “target values of a plurality of performance parameters” are substituted into the combustion parameter calculation expression 32b as the first correlation data, and “target values of the plurality of combustion parameters” are the solution. Is calculated, and “target values of a plurality of combustion parameters” are substituted into the control parameter calculation expression 33b as the second correlation data, and “command values of the plurality of control parameters” are calculated as a solution.

  Further, in FIG. 7, a feedback control unit 51 and a correction unit 52 are provided for calculating the target value of the combustion parameter, and the target values of the plurality of performance parameters calculated by the combustion parameter calculation formula 32b are used as the feedback control unit 51. The correction is performed using the feedback correction amount calculated in (1). Further, regarding the calculation of the control parameter command value, a feedback control unit 53 and a correction unit 54 are provided, and the feedback control unit 53 calculates the command values of a plurality of control parameters calculated by the control parameter arithmetic expression 33b. The correction is made according to the correction amount.

  Also in the present embodiment, as in the first embodiment, each arithmetic expression 32b, 33b (first and second correlation data) is used, and each feedback control of the performance parameter and the combustion parameter is performed. It is possible to implement engine control that makes it difficult to cause mutual interference among a plurality of performance parameters. Further, in the engine adaptation, it is possible to easily find the control parameter command value as the adaptation value while making it difficult for the plurality of performance parameters to interfere with each other. Therefore, the accuracy of the adaptation can be improved and the adaptation work can be simplified.

(Other embodiments)
The present invention is not limited to the description of the above embodiment, and may be implemented as follows, for example.

  In each of the above-described embodiments, a configuration in which the calibration ECU 25 is connected to the engine ECU 20 via the bidirectional communication bus 28 when the engine 10 is adapted (in other words, a configuration in which the calibration ECU is externally connected only at the time of adaptation). However, this may be changed, and the compatible ECU 25 may be provided as an in-vehicle ECU. Further, the engine ECU 20 may have a conforming program. In this case, the engine ECU 20 has the programs shown in FIGS. 3 and 4 and executes them.

  In each of the above embodiments, feedback control is performed for the performance parameter and the combustion parameter as the combustion F / B control. However, only the performance parameter feedback control is performed, and the open control is performed for the combustion parameter. Good. Specifically, in the block diagram shown in FIG. 7, the combustion parameter deviation calculation unit 35, the feedback control unit 53, and the correction unit 54 are abolished, and control parameter calculation formulas are used without performing feedback calculation of command values of a plurality of control parameters. It may be calculated by 33 b and output to each actuator 11.

  In each of the above embodiments, the combustion parameter calculation formula 32b made of a determinant is used as the first correlation data, and the control parameter calculation formula 33b made of a determinant is used as the second correlation data. The configuration may be such that at least one of the first correlation data and the second correlation data is stored in a form that is not a parameter arithmetic expression (determinant). For example, the configuration may be such that each of these correlation data is stored in a map format. In this case, with regard to the first correlation data, for each combustion parameter included in the “plurality of combustion parameters”, a constant value representing a correlation with the plurality of control parameters may be stored in a map format. Regarding the second correlation data, for each control parameter included in the “plurality of control parameters”, a constant value representing a correlation with the plurality of combustion parameters may be stored in a map format.

  DESCRIPTION OF SYMBOLS 10 ... Engine, 11 ... Actuator, 20 ... Engine ECU, 25 ... Conformity ECU (engine adaptation apparatus, adaptation means, control means), 31 ... Performance parameter calculation part (performance target setting means), 32 ... Combustion parameter calculation part (combustion) (Target setting means), 32b ... combustion parameter calculation formula, 33 ... actuator control section (control command value calculation means), 33b ... control parameter calculation formula, 34 ... performance parameter deviation calculation section, 35 ... combustion parameter deviation calculation section.

Claims (2)

An engine adapting apparatus comprising adapting means for adapting a control amount of the actuator under a plurality of predetermined engine operating conditions for an engine operated by actuation of an actuator,
Performance target setting means for setting a target value of each performance parameter for a plurality of performance parameters representing the performance of the engine;
The first correlation data defining the correlation between the plurality of performance parameters and the plurality of combustion parameters representing the combustion state of the engine is used, and the plurality of performance parameters are set based on the target value of each performance parameter set by the performance target setting means. Combustion target setting means for calculating a target value of the combustion parameter of
Using the second correlation data that defines the correlation between the plurality of combustion parameters and the plurality of control parameters related to the actuator, a command for the plurality of control parameters is based on the target value of each combustion parameter set by the combustion target setting means. Control command value calculating means for calculating a value;
Control means for controlling the operation of the actuator based on command values of the plurality of control parameters calculated by the control command value calculating means;
With
The performance parameter feedback control is performed so as to eliminate the deviation between the target value of each performance parameter set by the performance target setting means and the actual value of the performance parameter,
The adapting means is
In adapting the engine, conforming condition setting means for sequentially setting the plurality of engine operating conditions;
As the target value set by the performance target setting means, conformity target setting means for setting a conformity target value that is a target value at the time of conformity for the plurality of performance parameters;
Convergence determination means for determining that actual values of the plurality of performance parameters have converged with respect to the adaptation target value under each operating condition at the time of adaptation set by the adaptation condition setting means;
Registration means for registering a command value of the control parameter in the convergence state in a predetermined memory as an appropriate value when convergence of the plurality of performance parameters is determined by the convergence determination means;
An engine adaptation device characterized by comprising:   The engine adaptation device according to claim 1, wherein feedback control of the combustion parameter is performed so as to eliminate a deviation between a target value of each combustion parameter set by the combustion target setting means and an actual value of the combustion parameter. .

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