JP2002206455A - Method of forming characteristics map for fuel injection quantity of engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of forming a characteristics map of the fuel injection quantity of an engine, capable of efficiently forming the characteristics map of the optimal fuel injection quantity, by reducing the labor and man-hours of the forming work and eliminating individual differences between workers and fluctuation by each work. SOLUTION: When a diesel engine E is set at a target engine speed by an engine speed control means 1 and set at a target load torque by a load control means 2, whenever the operating position of the rack of a fuel injection actuator 3 is detected, and the detected operating position of the rack of the fuel injection actuator is stored in a personal computer 5 with the actual engine speed and the actual load torque of the engine E. The stored operating position of the rack of the fuel injection actuator is sent by a communicating means 6, together with data groups of the real engine speed and the actual load torque, and the characteristics map of the engine fuel injection quantity is formed on the basis of these data groups.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for creating an engine fuel injection amount characteristic map for creating an optimum fuel injection amount characteristic map for engines having individual differences.
In particular, the present invention relates to a measure for efficiently creating a characteristic map of an optimal fuel injection amount.

2. Description of the Related Art Generally, even if engines such as diesel engines are the same one assembled on a production line, there is an individual difference between the engines. Therefore, a rack for determining a fuel injection amount for each engine speed is required. By repeatedly determining the position and limiting the allowable maximum output of the engine for each engine speed, a characteristic map of an optimum upper limit fuel injection amount is created for each engine. In this case, the upper limit fuel injection amount characteristic map for each engine is manually set so that the engine speed reaches a target target speed, and the maximum allowable output of the engine at this target speed is manually set. , And the rack position of the fuel injection amount at that time is visually read.

However, in the prior art described above, when creating the fuel injection amount characteristic map of the engine, the target rotational speed of the engine is set and the maximum allowable output of the engine at the target rotational speed is determined. Since the setting is manually performed and the reading of the rack position of the fuel injection amount is performed visually, the production work requires manpower and the number of steps increases. In addition, it is not possible to efficiently create an optimum upper limit fuel injection amount characteristic map due to differences among workers and variations between works. The present invention has been made in view of such a point, and an object of the present invention is to automate the creation of an engine fuel injection amount characteristic map, reduce the number of man-hours and man-hours of the creation, and reduce the individual work of each worker. An object of the present invention is to provide a method for creating an engine fuel injection amount characteristic map that can efficiently create an optimal fuel injection amount characteristic map while eliminating differences and variations between works.

Means for Solving the Problems In order to achieve the above object, a solution taken by the invention according to claim 1 is a target rotation speed setting means for setting the rotation speed of the engine to a target rotation speed; Target output setting means for setting an output to a target output; a fuel injection actuator operable to inject fuel into the engine; operating state detecting means for detecting an operation amount of the fuel injection actuator; and operation of the fuel injection actuator There is provided storage means for storing the amount, and reading means for reading out the operation amount of the fuel injection actuator stored in the storage means. Each time the engine is set to the target rotation speed and set to the target output, the operation amount of the fuel injection actuator is detected each time, and the detected operation amount of the fuel injection actuator is determined. The stored operation amount of the fuel injection actuator is read, and a characteristic map of the engine fuel injection amount is created based on the read operation amount of the fuel injection actuator.
According to this specific matter, the detected value of the operation amount of the fuel injection actuator is automatically stored every time the engine is set to the target rotation speed and the target output. Therefore, when creating the fuel injection amount characteristic map of the engine, It is not necessary to manually set the target rotation speed and the maximum allowable output of the engine at the target rotation speed, and it is not necessary to visually read the rack position of the fuel injection amount. Therefore, the number of manpower and man-hours for the preparation work are reduced, and the difference between the workers and the variation between the works are eliminated, and the characteristic map of the optimal fuel injection amount can be efficiently prepared. According to a second aspect of the present invention, there is provided a solution to the problem, wherein a target speed setting means for setting an engine speed to a target speed, and a corresponding target output value based on the target engine speed. Target output value setting means, a fuel injection actuator operating to inject fuel to the engine, operating state detecting means for detecting an operation amount of the fuel injection actuator, an operation amount of the fuel injection actuator, a target rotation of the engine The storage unit includes a storage unit that stores a series of data including numbers and target output values, and a reading unit that reads out the data group stored in the storage unit. Then, each time the engine is set to the target rotation speed, a series of data including the target rotation speed, the target output value of the engine corresponding to the target rotation speed, and the operation amount of the fuel injection actuator is generated. The data group is generated and stored, the stored data group is read, and a characteristic map of the engine fuel injection amount is created based on the read data group. According to this specific matter, the target output value corresponding to the target engine speed is automatically set based on the target engine speed, so each time the engine is set to the target engine speed,
There is no need to set the corresponding target output,
It is possible to simplify the process of artificially creating the engine fuel injection amount characteristic map. Further, a solution means adopted by the invention according to claim 3 is to automatically convert the created engine fuel injection amount characteristic map as ROM data and automatically output the converted ROM data. I have to. According to this specific matter, even the creation of the ROM data of the engine fuel injection amount characteristic map can be automatically performed, and the artificial creation process of the engine fuel injection amount characteristic map can be greatly simplified. Become.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an engine fuel injection amount characteristic map creating apparatus to which an engine fuel injection amount characteristic map creating method according to an embodiment of the present invention is applied. In FIG. 1, an engine fuel injection amount characteristic map creation device X
Applies the load from the load device 21 to the output shaft Ea of the diesel engine E, and the rotation speed control means 1 as target rotation speed setting means for setting the rotation speed of the output shaft Ea of the diesel engine E to the target rotation speed. Load control means 2 for setting the load torque (output) to the target load torque (target output), and a fuel injection actuator 3 for operating a rack to inject fuel into the diesel engine E. A rack position detecting means 4 as an operating state detecting means for detecting the operating position (operating amount) of the rack by the fuel injection actuator 3;
A personal computer 5 as setting means for setting the target rotation speed and the target load torque; and the fuel injection actuator 3 and the load device 21 based on the target rotation speed and the target load torque transmitted from the personal computer 5. Load adjusting and reading means for adjusting the rotational speed and the load torque of the engine E so as to match the target values, and reading the actual rotational speed, the actual load torque and the rack operating position of the fuel injection actuator 3 at that time. And a communication means 6 for transmitting to the personal computer 5 the actual rotational speed, the actual load torque and the rack operating position of the fuel injection actuator 3 read by the controller C. In this case, the actual rotation speed, the actual load torque and the rack operating position of the fuel injection actuator 3 transmitted by the communication means 6 are stored in the personal computer 5. Therefore, the personal computer 5 is also used as storage means. As shown in FIG. 2, the rotation speed control means 1 includes 16 target adjustment point numbers 0 to 15 arbitrarily determined up to the maximum rotation speed of the diesel engine E.
The diesel engine E
The number of rotations is set. The rotation speed control means 1 performs isochronous control to maintain the rotation speed of the diesel engine E at the target rotation speed (constant rotation speed) without decreasing the rotation speed of the diesel engine E by the target load applied by the load device H. . Load device 2 of load control means 2
1, a hydraulic pump 22 rotatably connected to an output shaft Ea of a diesel engine E, and a hydraulic piping passage 23 for supplying and discharging hydraulic oil to and from the hydraulic pump 22 as shown in FIG.
And a hydraulic valve 24 interposed on the hydraulic piping path 23 to adjust the supply and discharge amount of pressure oil flowing through the hydraulic piping path 23. The load control unit 2 controls the rotation speed of the diesel engine E set to the target rotation speed at each of the adjustment point numbers 0 to 15 by the rotation speed control unit 1 and the hydraulic piping path Pa.
Load torque calculating means 25 for calculating a target load torque of the diesel engine E based on the flow rate and the hydraulic pressure of the hydraulic oil flowing through the inside. Then, the target load torque calculated by the load calculation means 25 is input to the load control means 2, and the opening degree of the hydraulic valve 24 is controlled by the load control means 2, whereby the desired target load torque is set to the load device 21. (Hydraulic pump 22) acts on the output shaft Ea of the diesel engine E. The fuel injection actuator 3 is operated by a command signal from the controller C. The rack position detecting means 4 is configured to output a detection signal to the communication means 6 when detecting the operating position of the rack. The communication means 6 inputs the target rotation speed and the target load torque at each of the adjustment point numbers 0 to 15 to be acquired on the map input on the monitor screen 51 of the personal computer 5, while controlling the target rotation speed to a constant value. Then, the rack operating position of the fuel injection actuator 3 when the opening degree of the hydraulic valve 24 is adjusted in the closing direction to reach the target load torque is transmitted to the personal computer 5. The rack operating position transmitted to the personal computer 5 is stored in a storage unit (not shown) in the personal computer 5. When the rack operating position of the fuel injection actuator 3 corresponding to all target rotation speeds and target load torques at the respective adjustment point numbers 0 to 15 is transmitted to the personal computer 5, the data is output. I have. Next, an example of an engine fuel injection amount characteristic map creation method using the engine fuel injection amount characteristic map creation device will be described with reference to FIG. First, in a map constant determination step, a map constant is determined. Then, in the constant setting step by the engine unit test, the data group such as the rack operation position of the fuel injection actuator corresponding to the target rotation speed and the target load torque at each adjustment point number 0 to 15 created by the engine unit test is individually And evaluate the performance of the engine alone with a map. And finally, RO
In the M conversion process, a data group such as a rack operation position of the fuel injection actuator 3 corresponding to all target rotation speeds and target load torques at the respective adjustment point numbers 0 to 15 created in the constant setting process based on the engine unit test described above. The created engine fuel injection characteristic map is converted as ROM data and output as a file. Here, the procedure of a method for creating a characteristic map of an engine fuel injection amount created in a constant setting step by an engine unit test, which is a characteristic part of the present invention, will be described in detail. First, on the monitor screen 51 of the personal computer 5, the target rotation speed and the target load torque at the first adjustment point number 0 to be obtained from the 16 adjustment point numbers on the map are input, and the first adjustment point is set. The target rotation speed and the target load torque at the number 0 are transmitted to the controller C by the communication means 6. Next, the controller C controls the rotation speed control means 1 to set the rotation speed of the diesel engine E to the target rotation speed while the load control means 2 controls the hydraulic valve 24 of the load device 21.
Is controlled in the closing direction to increase the load torque so that the desired target load torque acts on the output shaft Ea of the diesel engine E. At this time, the rotation speed of the diesel engine E is maintained at the target rotation speed by the load applied by the load device H by the isochronous control by the rotation speed control means 1. Thereafter, when the load torque measured by the controller C exceeds the target load torque of the adjustment point number 0 by controlling the opening degree of the hydraulic valve 24 in the closing direction,
That is, when the maximum allowable load torque is reached, the hydraulic valve 24
The control of the opening of the engine E in the closing direction is prohibited, and the controller C reads the actual rotation speed, the actual load torque and the rack operating position of the fuel injection actuator 3 at that time.
Then, the actual rotation speed, the actual load torque and the fuel injection actuator 3 of the engine E read by the controller C are determined.
Is transmitted to the personal computer 5. Then, the actual rotational speed of the engine E, the actual load torque and the rack operating position of the fuel injection actuator 3 transmitted to the personal computer 5 are transmitted to the personal computer 5.
It is stored in the storage unit in the computer 5. Thereafter, starting from input of the target rotation speed and the target load torque at the next adjustment point number 1 to be acquired, the actual rotation speed of the engine E, the actual load torque and the rack operating position of the fuel injection actuator 3 are stored. , And successively updating the adjustment point numbers one by one. Thereafter, the storage of the actual rotation speed, the actual load torque, and the rack operation position of the fuel injection actuator 3 in the storage unit for all the adjustment point numbers 0 to 15 to be acquired on the map is completed. When the creation of the characteristic map of the fuel injection amount is completed, the ROM setting process is performed through the constant setting process according to the above-described main unit test.
After the characteristic map of the engine fuel injection amount is converted as ROM data, it is output to a file. As described above, in the present embodiment, each time the diesel engine E is set to the target rotation speed and the target load torque, the actual rotation speed, the actual load torque of the engine E, and the operating position of the rack of the fuel injection actuator 3 are automatically set. When the fuel injection amount characteristic map of the diesel engine is created, the setting of the target rotation speed of the diesel engine and the setting of the target load torque (maximum allowable load torque) of the diesel engine at the target rotation speed are manually stored. In addition, it is not necessary to visually read the operation position of the rack for the fuel injection amount. Therefore, the number of labors and man-hours for the creation operation are reduced, and the difference between the workers and the variation between the operations are eliminated, and the characteristic map of the optimal fuel injection amount can be efficiently created. Note that the present invention is not limited to the above-described embodiment, but includes various other modifications. For example, in the above embodiment, the load device 21 is configured by a hydraulic circuit, but the load device may be configured by a dynamometer or the like. That is, it is only necessary that the magnitude of the load can be controlled from the outside and the load value at that time can be detected as an output signal. Further, in the present embodiment, the operating position of the rack of the fuel injection actuator 3 is automatically stored every time the diesel engine E is set to the target rotation speed and the target load torque in the constant setting process by the engine unit test. Automatically converts, as ROM data, a characteristic map created by a data group such as a rack operating position, a target rotation speed, and a target load torque for determining a fuel injection amount in a ROMization process, and the converted ROM May be automatically output to a file. In this case, even the creation of the ROM data of the engine fuel injection amount characteristic map can be automatically performed, and the artificial creation process of the engine fuel injection amount characteristic map can be greatly simplified. further,
In the above embodiment, the case where the operating position of the rack of the fuel injection actuator 3 when the diesel engine E is set to the target rotation speed and the target load torque is described, but the present invention is not limited to this. . That is, it is needless to say that the present invention can be applied to the case where the fuel injection amount is determined based on the opening position of the fuel flow control valve of the gas engine or the output timing of the signal of the electronic fuel injection device.

As described above, according to the engine fuel injection amount characteristic map creating method according to the first aspect of the present invention, each time the engine is set to the target rotation speed and the target output, the operation amount of the fuel injection actuator is detected. By automatically storing the values, it is possible to reduce the number of man-hours and man-hours required to create the engine fuel injection amount characteristic map, eliminate differences between workers, and reduce variations between operations, and create an optimal fuel injection amount characteristic map. It can be created efficiently. Further, according to the engine fuel injection amount characteristic map creating method of the second aspect of the present invention, it is not necessary to set the target output every time corresponding to the target engine speed, and the engine fuel injection amount characteristic map is not artificially prepared. The creation process can be simplified.
Further, according to the engine fuel injection amount characteristic map creating method according to the third aspect of the present invention, the engine fuel injection amount characteristic map is automatically converted and output as ROM data, so that the engine fuel injection amount characteristic map is obtained. Can be automated up to the creation of the ROM data, and the artificial creation process of the engine fuel injection amount characteristic map can be greatly simplified.

[Brief description of the drawings]

FIG. 1 is a block diagram of an engine fuel injection amount characteristic map creating apparatus to which an engine fuel injection amount characteristic map creating method according to an embodiment of the present invention is applied.

FIG. 2 is an engine fuel injection amount characteristic map showing characteristics of a rack operation position of a fuel injection actuator with respect to a target engine speed.

FIG. 3 is a flowchart showing a flow of an engine fuel injection amount characteristic map creating method by the engine fuel injection amount characteristic map creating device.

[Explanation of symbols]

Reference Signs List 1 rotation speed control means (target rotation speed setting means) 2 load control means (target output setting means) 3 fuel injection actuator 4 rack position detection means (operation state detection means) 5 personal computer (storage means) C controller (readout means) ) E Diesel engine (engine)

Claims (3)

[Claims] 1. Target speed setting means for setting an engine speed to a target speed, target output setting means for setting an engine output to a target output, and fuel injection operable to inject fuel into the engine An actuator; an operation state detecting means for detecting an operation amount of the fuel injection actuator; a storage means for storing the operation amount of the fuel injection actuator; and a reading means for reading the operation amount of the fuel injection actuator stored in the storage means Each time the engine is set to the target speed and the target output, the operation amount of the fuel injection actuator is detected each time, and the detected fuel injection is detected. The operation amount of the actuator is stored, and the stored operation amount of the fuel injection actuator is read out. An engine fuel injection amount characteristic map creation method, wherein a characteristic map of the engine fuel injection amount is created based on the operated amount of operation of the fuel injection actuator. 2. A target engine speed setting means for setting an engine speed to a target engine speed, a target output value setting device for setting a corresponding target output value based on the engine target engine speed, A fuel injection actuator that operates to inject fuel, an operating state detecting unit that detects an amount of operation of the fuel injection actuator, and a series of data including an amount of operation of the fuel injection actuator, a target engine speed, and a target output value. Storage means for storing the group, and reading means for reading out the data group stored in the storage means. Each time the engine is set to the target rotation speed, the target rotation speed and its target A series of data consisting of the target output value of the engine corresponding to the rotation speed and the operation amount of the fuel injection actuator is generated, and these data groups are generated. The engine fuel injection amount is characterized by storing the data group, reading the stored data group, and creating a characteristic map of the engine fuel injection amount based on the read data group. How to create a characteristic map. 3. The engine fuel injection amount characteristic map creating method according to claim 1 or 2, wherein the created engine fuel injection amount characteristic map is automatically converted as ROM data. A method for creating an engine fuel injection amount characteristic map, wherein the ROM data is automatically output.