JP7625211B2 - ENGINE TESTING METHOD, ENGINE TESTING PROGRAM, AND ENGINE TESTING APPARATUS - Google Patents

Description

The present invention relates to an engine testing method, an engine testing program, and an engine testing device.

When building an engine model, it is known that it is possible to build a highly accurate engine model by using transient operation data from an automobile engine. In engine testing using transient operation, the operating variables input to the engine are comprehensively changed over time, and testing is performed under a variety of conditions. Therefore, before testing, a range of operating variables is explored that will not cause the engine to enter an abnormal state.

However, the range search for the manipulated variables is performed during steady-state operation, and differences in the operating boundaries may arise due to the effects of the system's dead time and time constants during transient operation. For this reason, the operating boundaries are manually adjusted through trial and error while detecting engine abnormalities such as deterioration of exhaust gases and misfires, and test patterns are repeatedly created. However, if this trial and error takes a long time, there is a problem that the overall labor required for engine testing, including pre-test preparation, will increase.

In one aspect, the objective is to provide an engine test method, an engine test program, and an engine test device that can perform engine testing with fewer test man-hours.

In the first proposal, the computer acquires a test pattern in which the manipulated variables used in the engine test change over time, and monitors at least one of the excess air ratio, intake manifold pressure and temperature, exhaust manifold pressure and temperature, and maximum pressure rise rate in the cylinder, which are obtained by inputting the manipulated variables based on the test pattern into the real engine, as monitoring parameters for engine abnormalities, and when the monitoring parameter exceeds a first threshold, holds the manipulated variable until the monitoring parameter falls below the first threshold, relaxes the setting value of the first threshold when the monitoring parameter is below a second threshold, and tightens the setting value of the first threshold when the monitoring parameter exceeds the second threshold, and executes processing to acquire time series data on the manipulated variables and the controlled quantities of the real engine relative to the manipulated variables.

On the one hand, engine testing can be carried out with less testing effort.

FIG. 1 is a diagram showing an example of the configuration of an engine testing system according to this embodiment. FIG. 2 is a diagram showing an example of a Chirp signal. FIG. 3 is a diagram showing an example of measurement positions of the monitoring parameters according to the present embodiment. FIG. 4 is a diagram showing an example of a combination of monitoring parameters and manipulated variables according to the present embodiment. FIG. 5 is a diagram showing an example of the determination of the monitoring parameters according to the present embodiment. FIG. 6 is a flowchart showing an example of the flow of an engine test process performed by the engine testing device 100 according to this embodiment. FIG. 7 is a flowchart showing an example of the flow of engine test processing by the information processing device 200 according to the present embodiment. FIG. 8 is a diagram showing an example of a hardware configuration of the engine testing device 100 according to the present embodiment.

Below, examples of the engine test method, engine test program, and engine test device according to this embodiment will be described in detail with reference to the drawings. Note that this embodiment is not limited to these examples. Furthermore, each example can be appropriately combined within a range that does not cause inconsistencies.

[Overall configuration example]
The configuration of an engine testing system according to this embodiment will be described with reference to Fig. 1. Fig. 1 is a diagram showing an example of the configuration of the engine testing system according to this embodiment. As shown in Fig. 1, the engine testing system includes an engine testing device 100, an information processing device 200, and an engine 300. The engine testing device 100, the information processing device 200, and the engine 300 are connected to each other so as to be able to communicate with each other.

The engine testing device 100 may be an engine controller that controls the engine 300. The engine testing device 100 inputs operation variables for controlling the engine 300 based on a test pattern created by the information processing device 200. The test pattern is, for example, a Chirp signal or an APRBS (Amplitude-modulated Pseudo Random Binary Sequences) signal that indicates a time series change in the operation variables.

Figure 2 is a diagram showing an example of a Chirp signal. In Figure 2, the horizontal axis of the graph represents time, and the vertical axis represents the value of the manipulated variable. As shown in Figure 2, the Chirp signal continuously changes its frequency components over time, making it possible to perform highly comprehensive testing of the test pattern using the characteristics of a trigonometric function. The Chirp signal is calculated, for example, using the following formula (1).

The manipulated variables are engine speed, fuel injection amount, turbine opening, EGR (Exhaust Gas Recirculation) valve opening, ITH (Intake Throttle) valve opening, etc. Therefore, test patterns such as Chirp signals are created for each manipulated variable.

In addition, as shown in FIG. 2, the test pattern is pattern data that indicates time-series changes in the operation variables, so the engine testing device 100 changes the operation variables, such as the engine speed and fuel injection amount, based on the test pattern and inputs them to the engine 300 to control the engine 300.

The data acquisition unit 111 of the engine testing device 100 acquires the monitoring parameters of the engine 300 obtained by inputting the operation variables to the engine 300, and the controlled variables for the operation variables. The monitoring parameters are parameters that are monitored to prevent engine abnormalities from occurring. Specifically, the monitoring parameters are, for example, the excess air ratio, the pressure and temperature of the intake manifold, the pressure and temperature of the exhaust manifold, and the maximum pressure rise rate in the cylinder. The data acquisition unit 111 can store the controlled variables and the like acquired from the engine 300 in the test data history 122 as engine test history data.

Figure 3 is a diagram showing an example of the measurement positions of the monitoring parameters according to this embodiment. For example, as shown in Figure 3, the intake manifold pressure and temperature, which are the monitoring parameters, are measured in the intake passage at the inlet of the intake manifold of the internal combustion engine. The maximum pressure rise rate in the cylinder, which is also a monitoring parameter, is measured in the cylinder of the engine 300, i.e., inside the cylinder. The exhaust manifold pressure and temperature and excess air ratio, which are also monitoring parameters, are measured in the exhaust passage that is combined by the exhaust manifold of the internal combustion engine.

The first threshold determination unit 112 and the second threshold determination unit 113 of the engine testing device 100 respectively determine whether the monitoring parameter is within the range of the first threshold and the second threshold. The first threshold and the second threshold are upper and lower limits that are preset in the threshold 121 for each monitoring parameter so that the engine 300 does not enter an abnormal state. Therefore, the first threshold and the second threshold are not thresholds that cause the engine 300 to enter an abnormal state, but thresholds that warn that an abnormal state may occur if the operating variable continues to be changed based on the test pattern.

The monitoring parameters are determined in advance for each operation variable and monitored. FIG. 4 is a diagram showing an example of a combination of the monitoring parameters and the operation variables according to this embodiment. FIG. 4 is an example, and for example, the air excess ratio of the monitoring parameters is monitored when any of the fuel injection amount, the turbine opening, the EGR valve opening, and the ITH valve opening is operated. On the other hand, the maximum pressure rise rate in the cylinder of the monitoring parameters is monitored when the fuel injection amount is operated. Strictly speaking, since the operation amount of each operation variable can affect all the monitoring parameters, it is also possible to monitor all the monitoring parameters when inputting each operation variable to the engine 300 and operating it. However, as shown in FIG. 4, by setting in advance a combination of monitoring parameters that have a large effect on the operation variables and dividing the monitoring parameters by operation variables, it is possible to perform more accurate monitoring and control of the engine 300.

Figure 5 is a diagram showing an example of the determination of the monitoring parameter according to this embodiment. Figure 5 shows the time transition of the operation variable and the monitoring parameter. As shown in Figure 5, when the monitoring parameter exceeds the first threshold (at time t1), the engine testing device 100 holds the operation variable until the monitoring parameter becomes less than the first threshold (at time t2). In this way, the engine testing device 100 controls the engine 300 so that it does not enter an abnormal state. Note that while Figure 5 shows that one operation variable is held for a monitoring parameter, multiple operation variables may be held for one monitoring parameter. In addition, the engine testing device 100 monitors multiple monitoring parameters and holds one or more operation variables corresponding to each of them, but the operation variables to be held may be based on priorities that are preset for the multiple monitoring parameters.

The first threshold correction unit 114 of the engine testing device 100 relaxes or tightens the first threshold depending on the result of the determination of the monitoring parameter. More specifically, for example, as shown in the time period t3 to t4 in FIG. 5, when the monitoring parameter exceeds the second threshold, the engine testing device 100 tightens the first threshold. Here, tightening the threshold means, for example, changing the first threshold so as to move it away from the second threshold, as shown in FIG. 5. This makes it easier for the monitoring parameter to exceed the first threshold, and the engine testing device 100 can control the engine 300 with higher accuracy so as not to enter an abnormal state.

Conversely, as shown in the time periods t1 to t3 and t4 to t2 in FIG. 5, when the monitoring parameter exceeds the first threshold but is less than the second threshold, the engine testing device 100 relaxes the first threshold. Here, relaxing the threshold means, for example, changing the first threshold to approach the second threshold as shown in FIG. 5. This allows the engine testing device 100 to continue engine testing without the monitoring parameter unnecessarily exceeding the first threshold within the engine's safety zone. The amount of change in the first threshold may be determined according to the rate of change of the manipulated variable. In the example of FIG. 5, the lower limit of the monitoring parameter is set as the first threshold and the second threshold, but an upper limit may be set, or both the upper limit and the lower limit may be set. In addition, the upper limit and the lower limit of the monitoring parameter may be set differently for each monitoring parameter.

Then, the manipulated variable determination unit 115 of the engine testing device 100 determines the next manipulated variable within a range in which the monitored parameters do not cause an abnormal state for the engine 300, inputs the next manipulated variable to the engine 300, and controls the engine 300. Note that the manipulated variables determined for the monitored parameters may be based on the combinations shown in FIG. 4, for example. In addition, the manipulated variable determination unit 115 can store the manipulated variables to be input to the engine 300 in the test data history 122 as engine test history data.

The information processing device 200 may be a desktop PC (Personal Computer) or a notebook PC. The test pattern creation unit 211 of the information processing device 200 creates a test pattern for engine testing of the engine 300. The created test pattern is transmitted to the engine testing device 100 as a provisional value of the manipulated variable. Note that the provisional value of the manipulated variable is used because the engine testing device 100 may input the manipulated variable indicated by the test pattern to the engine 300 as is, but may also change the manipulated variable to be input according to the monitoring parameter. In other words, the final value of the manipulated variable input to the engine 300 may differ from the provisional value.

The data acquisition unit 212 of the information processing device 200 also acquires from the engine testing device 100 the operation variables input to the engine 300 and the controlled variables for the operation variables of the engine 300 obtained by inputting the operation variables as needed. The acquired operation variables and controlled variables are stored in the time series data 221.

Engine 300 is an actual engine of an automobile. Engine 300 operates according to the manipulated variables input by engine testing device 100. Engine 300 also returns controlled quantities and monitoring parameters for the manipulated variables obtained by inputting the manipulated variables to engine testing device 100. Strictly speaking, rather than returning each piece of data to engine testing device 100, each piece of data is acquired by engine testing device 100.

[Process flow]
Next, a flow of engine test processing by the engine testing device 100 will be described with reference to Fig. 6. Fig. 6 is a flowchart showing an example of the flow of engine test processing by the engine testing device 100 according to this embodiment. The engine test processing shown in Fig. 6 is started at any timing after the engine 300 is started.

First, the engine testing device 100 acquires from the engine 300 the current operation variables, i.e., the initial values of each operation variable input to the engine 300, and the controlled variables obtained by inputting the operation variables (step S101). As shown in FIG. 6, after step S101, the test pattern created by the information processing device 200 is acquired, and the engine test and processing loop is started.

Next, the engine testing device 100 acquires each monitoring parameter and controlled variable obtained by inputting the manipulated variables from the engine 300 (step S102). Note that in the first step S102 immediately after the start of the loop, the controlled variables have already been acquired in step S101, so there is no need to acquire the controlled variables again. In addition, the engine testing device 100 stores the controlled variables acquired in step S101 or step S102 in the test data history 122 as engine test history data.

Next, the engine testing device 100 determines, for each monitoring parameter, whether the monitoring parameter is less than a first threshold value (step S103). Note that the determination in step S103 may be a determination as to whether the monitoring parameter is equal to or less than the first threshold value.

If all the monitoring parameters are less than the first threshold (step S103: Yes), the engine testing device 100 acquires the operation variables corresponding to the current test time from the test pattern (step S104). The acquired operation variables are input to the engine 300 as the next operation variables. If it is within the test time, the process returns to step S102 and the process is repeated until the end of the test time. On the other hand, if the test time has ended, the engine test process shown in FIG. 6 ends. The engine testing device 100 stores the operation variables input to the engine 300 for each loop in the test data history 122 as engine test history data.

On the other hand, if any of the monitored parameters exceeds the first threshold (step S103: No), the engine testing device 100 fixes (holds) the manipulated variable at the previous value (step S105). Here, the previous value of the manipulated variable is, for example, the most recent manipulated variable input to the engine 300. The manipulated variable to be held may be the manipulated variable corresponding to the monitored parameter that exceeds the first threshold, as shown in the combination in FIG. 4, or it may be all the manipulated variables.

Next, the engine testing device 100 determines, for each monitoring parameter, whether the monitoring parameter that exceeded the first threshold is less than the second threshold (step S106). Note that the determination in step S106 may also be based on whether the monitoring parameter is equal to or less than the second threshold.

If all of the monitoring parameters that exceeded the first threshold are less than the second threshold (step S106: Yes), the engine testing device 100 changes and relaxes the first threshold so that it approaches the second threshold (step S107).

On the other hand, if any of the monitoring parameters that exceeded the first threshold exceeds the second threshold (step S106: No), the engine testing device 100 tightens the first threshold by changing it so that it is closer to the second threshold (step S108).

After execution of step S107 or step S108, if it is within the test time, the process returns to step S102, the hold on the operation variables is released, and the process is repeated until the end of the test time. On the other hand, if the test time has ended, the engine test process shown in FIG. 6 ends.

Next, the flow of engine test processing by the information processing device 200 will be described with reference to FIG. 7. FIG. 7 is a flowchart showing an example of the flow of engine test processing by the information processing device 200 according to this embodiment. The engine test processing shown in FIG. 7 is started at any timing. However, since the test pattern created in the engine test processing shown in FIG. 7 is used in the engine test processing shown in FIG. 6, the engine test processing shown in FIG. 7 is started before the engine test processing shown in FIG. 6.

First, the information processing device 200 creates a test pattern using a Chirp signal or an APRBS signal that indicates the time series changes of the manipulated variables (step S201). Note that a test pattern is created for each manipulated variable. In addition, the created test pattern is transmitted to the engine testing device 100.

Next, the information processing device 200 acquires from the engine testing device 100 the operation variables input to the engine 300 and the controlled variables of the engine 300 corresponding to the operation variables obtained by inputting the operation variables at any time (step S202). The acquired operation variables and controlled variables are stored in the time series data 221. Then, if it is within the test time (step S203: No), step S202 is repeated until the engine test ends. On the other hand, if the test time has ended (step S203: Yes), the engine test process shown in FIG. 7 ends.

As described above, the engine testing device 100 acquires a test pattern in which the operating variables used in the engine test change over time, and monitors at least one of the excess air ratio, the intake manifold pressure and temperature, the exhaust manifold pressure and temperature, and the maximum pressure rise rate in the cylinder, which are obtained by inputting the operating variables based on the test pattern into the real engine, as monitoring parameters for engine abnormalities, and when the monitoring parameter exceeds a first threshold, holds the operating variable until the monitoring parameter falls below the first threshold, relaxes the setting value of the first threshold when the monitoring parameter is below a second threshold, and tightens the setting value of the first threshold when the monitoring parameter exceeds the second threshold, and acquires time series data on the operating variables and the controlled quantities of the real engine relative to the operating variables.

In this way, the engine testing device 100 controls the operation variables based on the monitoring parameters obtained by inputting the operation variables based on the test pattern to the engine 300. This eliminates trial and error when creating the test pattern, and allows engine testing to be performed with fewer man-hours.

The process of generating a test pattern executed by the engine testing device 100 also includes a process of generating a Chirp signal or an APRBS signal that indicates a time series change in the manipulated variable as the test pattern.

This allows the engine testing device 100 to perform highly comprehensive engine testing.

The engine testing device 100 also sets the upper and lower limits of the monitoring parameters as the first and second thresholds.

This allows the engine testing device 100 to control the engine 300 with greater precision to prevent it from entering an abnormal state.

The engine testing device 100 also sets both the upper and lower limit values of the monitoring parameter as the first and second threshold values.

This allows the engine testing device 100 to control the engine 300 with greater precision to prevent it from entering an abnormal state.

In addition, the engine testing device 100 determines the first threshold value according to the rate of change of the operating variable.

This allows the engine testing device 100 to control the engine 300 with greater precision to prevent it from entering an abnormal state.

The process of holding the operational variables executed by the engine testing device 100 includes a process of holding one operational variable for one monitoring parameter.

This allows the engine testing device 100 to perform more accurate monitoring and control of the engine 300.

In addition, the process of holding the operational variables executed by the engine testing device 100 includes a process of holding multiple operational variables for one monitoring parameter.

This allows the engine testing device 100 to perform more accurate monitoring and control of the engine 300.

The process of holding the operational variables executed by the engine testing device 100 also includes a process of holding the operational variables based on the priority of the monitored parameters.

This allows the engine testing device 100 to perform more accurate monitoring and control of the engine 300.

[system]
The information including the processing procedures, control procedures, specific names, various data and parameters shown in the above documents and drawings may be changed arbitrarily unless otherwise specified. In addition, the specific examples, distributions, numerical values, etc. described in the embodiments are merely examples and may be changed arbitrarily.

The specific form of distribution or integration of the components of each device is not limited to that shown in the figure. For example, the manipulated variable determination unit 115 of the engine testing device 100 may be distributed to multiple processing units, or the first threshold determination unit 112 and the second threshold determination unit 113 of the engine testing device 100 may be integrated into one processing unit. In other words, all or part of the components may be functionally or physically distributed or integrated in any unit depending on various loads and usage conditions. Furthermore, all or any part of the processing functions of each device may be realized by a CPU and a program analyzed and executed by the CPU, or may be realized as hardware using wired logic.

[Hardware]
Fig. 8 is a diagram showing an example of a hardware configuration of the engine testing device 100 according to the present embodiment. As shown in Fig. 8, the engine testing device 100 has a communication unit 100a, a storage device 100b, a memory 100c, and a processor 100d. The units shown in Fig. 8 are connected to each other via a bus or the like. Although the example in Fig. 8 shows the hardware configuration of the engine testing device 100, the information processing device 200 may also have a similar configuration.

The communication unit 100a is a network interface card or the like, and communicates with other information processing devices. The storage device 100b stores programs and data that operate the various functions of the engine testing device 100 shown in FIG. 1.

The processor 100d reads out a program that operates each function of the engine testing device 100 shown in FIG. 1 from the storage device 100b, etc. Then, the processor 100d loads the read out program into the memory 100c, thereby executing a process that realizes each function of the engine testing device 100 shown in FIG. 1.

The engine testing device 100 can also realize each function by reading and executing a program that operates each function of the engine testing device 100 shown in FIG. 1 from a recording medium using a media reading device. Note that the program in this other embodiment is not limited to being executed by the engine testing device 100. For example, the present invention may be similarly applied to cases where another information processing device executes a program, or where these cooperate to execute a program.

The program for operating each function of the engine testing device 100 shown in FIG. 1 may be distributed via a network such as the Internet. The program may be recorded on a computer-readable recording medium such as a hard disk drive (HDD), solid state drive (SSD), flexible disk (FD), CD-ROM, magneto-optical disk (MO), or digital versatile disc (DVD), and may be read from the recording medium and executed by the computer.

The following notes are further provided with respect to the embodiments including the above examples.

(Appendix 1) Obtain a test pattern in which the operating variables used in the engine test change over time,
monitoring at least one of an excess air ratio, an intake manifold pressure and temperature, an exhaust manifold pressure and temperature, and a maximum pressure rise rate in a cylinder, which are obtained by inputting the operation variables based on the test pattern into a real engine, as a monitoring parameter for an engine abnormality;
if the monitored parameter exceeds a first threshold, holding the manipulated variable until the monitored parameter falls below the first threshold;
a process of loosening a setting value of the first threshold when the monitoring parameter is less than a second threshold, and a process of tightening a setting value of the first threshold when the monitoring parameter exceeds the second threshold, and a process of acquiring time series data of the operating variable and a controlled amount of the actual engine corresponding to the operating variable.

(Appendix 2) The engine testing method described in Appendix 1, characterized in that the process of generating the test pattern includes a process of generating, as the test pattern, a Chirp signal or an Amplitude-modulated Pseudo Random Binary Sequences (APRBS) signal that indicates a time series change in the manipulated variable.

(Appendix 3) The engine testing method described in Appendix 1, characterized in that the computer executes a process of setting upper and lower limit values of the monitoring parameters as the first and second threshold values.

(Appendix 4) The engine testing method described in Appendix 1, characterized in that the computer executes a process of setting both an upper limit value and a lower limit value of the monitoring parameter as the first threshold value and the second threshold value.

(Appendix 5) The engine testing method described in Appendix 1, characterized in that the computer executes a process for determining the first threshold value according to the rate of change of the operating variable.

(Appendix 6) The engine testing method described in Appendix 1, characterized in that the process of holding the operational variables includes a process of holding one of the operational variables for one of the monitoring parameters.

(Appendix 7) The engine testing method described in Appendix 1, characterized in that the process of holding the operational variables includes a process of holding multiple operational variables for one of the monitoring parameters.

(Appendix 8) The engine testing method described in Appendix 1, characterized in that the process of holding the operational variables includes a process of holding the operational variables based on a priority for the monitoring parameters.

(Appendix 9) Obtain a test pattern in which an operating variable used in an engine test changes over time;
monitoring at least one of an excess air ratio, an intake manifold pressure and temperature, an exhaust manifold pressure and temperature, and a maximum pressure rise rate in a cylinder, which are obtained by inputting the operation variables based on the test pattern into a real engine, as a monitoring parameter for an engine abnormality;
if the monitored parameter exceeds a first threshold, holding the manipulated variable until the monitored parameter falls below the first threshold;
2. An engine testing program comprising: a computer program that causes a computer to execute a process of: relaxing a setting value of the first threshold when the monitoring parameter is less than a second threshold; and tightening a setting value of the first threshold when the monitoring parameter exceeds the second threshold; and acquiring time-series data of the operation variable and a controlled variable of the actual engine corresponding to the operation variable.

(Appendix 10) The engine test program described in Appendix 9, characterized in that the process of generating the test pattern includes a process of generating, as the test pattern, a Chirp signal or an Amplitude-modulated Pseudo Random Binary Sequences (APRBS) signal that indicates a time series change in the manipulated variable.

(Appendix 11) The engine test program described in Appendix 9, characterized in that the computer is caused to execute a process of setting upper and lower limit values of the monitoring parameters as the first and second threshold values.

(Appendix 12) The engine test program described in Appendix 9, characterized in that the computer is caused to execute a process of setting both an upper limit value and a lower limit value of the monitoring parameter as the first threshold value and the second threshold value.

(Appendix 13) The engine test program described in Appendix 9, characterized in that the computer is caused to execute a process for determining the first threshold value according to the rate of change of the operating variable.

(Appendix 14) The engine test program described in Appendix 9, characterized in that the process of holding the operational variables includes a process of holding one of the operational variables for one of the monitoring parameters.

(Appendix 15) The engine test program described in Appendix 9, characterized in that the process of holding the operational variables includes a process of holding multiple operational variables for one of the monitoring parameters.

(Appendix 16) The engine test program described in Appendix 9, characterized in that the process of holding the operational variables includes a process of holding the operational variables based on a priority for the monitoring parameters.

(Appendix 17) Acquire a test pattern in which an operating variable used in an engine test changes over time;
monitoring at least one of an excess air ratio, an intake manifold pressure and temperature, an exhaust manifold pressure and temperature, and a maximum pressure rise rate in a cylinder, which are obtained by inputting the operation variables based on the test pattern into a real engine, as a monitoring parameter for an engine abnormality;
if the monitored parameter exceeds a first threshold, holding the manipulated variable until the monitored parameter falls below the first threshold;
a control unit that executes a process of relaxing a setting value of the first threshold when the monitoring parameter is less than a second threshold, and a process of tightening the setting value of the first threshold when the monitoring parameter exceeds the second threshold, and a process of acquiring time series data of the operation variable and a controlled amount of the actual engine with respect to the operation variable.

(Appendix 18) The engine testing device described in appendix 17, characterized in that the process of generating the test pattern includes a process of generating, as the test pattern, a Chirp signal or an APRBS (Amplitude-modulated Pseudo Random Binary Sequences) signal that indicates a time series change in the manipulated variable.

(Appendix 19) The engine testing device described in appendix 17, characterized in that the control unit executes a process of setting the upper limit value and lower limit value of the monitoring parameter as the first threshold value and the second threshold value.

(Appendix 20) The engine testing device described in Appendix 17, characterized in that the control unit executes a process of setting both the upper limit and the lower limit of the monitoring parameter as the first threshold and the second threshold.

(Appendix 21) The engine testing device described in Appendix 17, characterized in that the control unit executes a process for determining the first threshold value according to the rate of change of the operating variable.

(Appendix 22) The engine testing device described in Appendix 17, characterized in that the process of holding the operational variables includes a process of holding one of the operational variables for one of the monitoring parameters.

(Appendix 23) The engine testing device described in Appendix 17, characterized in that the process of holding the operational variables includes a process of holding multiple operational variables for one of the monitoring parameters.

(Appendix 24) The engine testing device described in appendix 17, characterized in that the process of holding the operational variables includes a process of holding the operational variables based on a priority for the monitoring parameters.

(Supplementary Note 25) A processor;
and a memory operatively connected to a processor, the processor comprising:
A test pattern is obtained in which an operating variable used in an engine test changes over time;
monitoring at least one of an excess air ratio, an intake manifold pressure and temperature, an exhaust manifold pressure and temperature, and a maximum pressure rise rate in a cylinder, which are obtained by inputting the operation variables based on the test pattern into a real engine, as a monitoring parameter for an engine abnormality;
if the monitored parameter exceeds a first threshold, holding the manipulated variable until the monitored parameter falls below the first threshold;
a process of relaxing the setting value of the first threshold when the monitoring parameter is less than a second threshold, and a process of tightening the setting value of the first threshold when the monitoring parameter exceeds the second threshold, and a process of acquiring time series data of the operation variable and a controlled variable of the actual engine with respect to the operation variable.

REFERENCE SIGNS LIST 100 Engine testing device 100a Communication unit 100b Storage device 100c Memory 100d Processor 111 Data acquisition unit 112 First threshold judgment unit 113 Second threshold judgment unit 114 First threshold correction unit 115 Operation variable determination unit 121 Threshold 122 Test data history 200 Information processing device 211 Test pattern creation unit 212 Data acquisition unit 221 Time series data 300 Engine

Claims (10)

A test pattern is obtained in which an operating variable used in an engine test changes over time;
monitoring at least one of an excess air ratio, an intake manifold pressure and temperature, an exhaust manifold pressure and temperature, and a maximum pressure rise rate in a cylinder, which are obtained by inputting the operation variables based on the test pattern into a real engine, as a monitoring parameter for an engine abnormality;
if the monitored parameter exceeds a first threshold, holding the manipulated variable until the monitored parameter falls below the first threshold;
a process of loosening a setting value of the first threshold when the monitoring parameter is less than a second threshold, and a process of tightening a setting value of the first threshold when the monitoring parameter exceeds the second threshold, and a process of acquiring time series data of the operating variable and a controlled amount of the actual engine corresponding to the operating variable. The engine testing method according to claim 1, characterized in that the process of generating the test pattern includes a process of generating, as the test pattern, a Chirp signal or an APRBS (Amplitude-modulated Pseudo Random Binary Sequences) signal that indicates a time series change in the manipulated variable. The engine testing method according to claim 1, characterized in that the computer executes a process of setting an upper limit value or a lower limit value of the monitoring parameter as the first threshold value and the second threshold value. The engine testing method according to claim 1, characterized in that the computer executes a process of setting both an upper limit value and a lower limit value of the monitoring parameter as the first threshold value and the second threshold value. The engine testing method according to claim 1, characterized in that the computer executes a process for determining the first threshold value according to the rate of change of the manipulated variable. The engine testing method according to claim 1, characterized in that the process of holding the manipulated variables includes a process of holding one of the manipulated variables for one of the monitoring parameters. The engine testing method according to claim 1, characterized in that the process of holding the operational variables includes a process of holding multiple operational variables for one of the monitoring parameters. The engine testing method according to claim 1, characterized in that the process of holding the operational variables includes a process of holding the operational variables based on a priority for the monitoring parameters. A test pattern is obtained in which an operating variable used in an engine test changes over time;
monitoring at least one of an excess air ratio, an intake manifold pressure and temperature, an exhaust manifold pressure and temperature, and a maximum pressure rise rate in a cylinder, which are obtained by inputting the operation variables based on the test pattern into a real engine, as a monitoring parameter for an engine abnormality;
if the monitored parameter exceeds a first threshold, holding the manipulated variable until the monitored parameter falls below the first threshold;
2. An engine testing program comprising: a computer program that causes a computer to execute a process of: relaxing a setting value of the first threshold when the monitoring parameter is less than a second threshold; and tightening a setting value of the first threshold when the monitoring parameter exceeds the second threshold; and acquiring time-series data of the operation variable and a controlled variable of the actual engine corresponding to the operation variable. A test pattern is obtained in which an operating variable used in an engine test changes over time;
monitoring at least one of an excess air ratio, an intake manifold pressure and temperature, an exhaust manifold pressure and temperature, and a maximum pressure rise rate in a cylinder, which are obtained by inputting the operation variables based on the test pattern into a real engine, as a monitoring parameter for an engine abnormality;
if the monitored parameter exceeds a first threshold, holding the manipulated variable until the monitored parameter falls below the first threshold;
a control unit that executes a process of relaxing a setting value of the first threshold when the monitoring parameter is less than a second threshold, and a process of tightening the setting value of the first threshold when the monitoring parameter exceeds the second threshold, and a process of acquiring time series data of the operation variable and a controlled amount of the actual engine with respect to the operation variable.

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