JP3576699B2 - Data analysis device for electronic control unit - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a data analysis device that reads actual data indicating an operation state of an electronic control device such as an on-vehicle electronic fuel injection device and performs data display based on the actual data.
[0002]
[Prior art]
In the case of an in-vehicle internal combustion engine as an electronic control device, there is one for controlling the operating state of the internal combustion engine to an optimal state.For example, in an internal combustion engine that supplies fuel using injection, the amount of fuel to be supplied is set to the vehicle 2. Description of the Related Art An electronic fuel injection device that detects an operating state of an engine by a sensor and calculates and controls the operating state according to a sensor detection value is well known.
[0003]
The control operation state of such an electronic control device, for example, in order to determine whether a sensor or a control device main body is operating normally, an electronic control device is actually mounted on a vehicle to operate an engine, Tests are being carried out by running. In the test, the electronic control unit samples each sensor output value or calculated value as data, accumulates the data in a memory as a data group, and analyzes the accumulated data.
[0004]
[Problems to be solved by the invention]
By the way, as one of the methods of analyzing accumulated data, there is a method of displaying a level change of each data of a data group on a display device in a graph. However, although the number of data stored in the memory depends on the sampling frequency, usually, a large amount of data can be obtained even in a short data measurement period. Therefore, when the number of data is large, it is difficult to show the change in the overall data level during the data measurement period using a display, and accurate data display is desired.
[0005]
Therefore, an object of the present invention is to provide a data analysis device of an electronic control device capable of accurately indicating a change in the overall data level during the data measurement period even when a large number of data is obtained during the data measurement period. It is to be.
[0006]
[Means for Solving the Problems]
The data analysis device of the electronic control device of the present invention is a data analysis device that performs data display based on actual data of detection or control parameters obtained during control in the electronic control device on a display, Said Real data storage means for sequentially obtaining real data of at least one parameter from the electronic control device and storing the data as a data group; The actual data Number of data in one data group obtained from storage means And the Number of dots that can be displayed on the display in one direction Division by Means, Based on the division result of the division means, Thinning out data of one data group Ku thinning means When, A conversion data storage unit that stores conversion data including a conversion formula for converting actual data into a physical value for each of a plurality of parameters in advance; and a conversion data storage unit that stores each data after thinning out the data of the one data group. Conversion means for sequentially converting to physical values according to the conversion formula in the conversion data obtained from the conversion data, and level display of the physical values sequentially obtained from the conversion means on the display in order using the predetermined direction as a time axis. Display control means, It is characterized by including.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The data analysis device of the vehicle electronic control device shown in FIG. 1 includes a control circuit 1 and an interface circuit 2. An ECU (electronic control unit) 3 of an electronic control device is connected to the interface circuit 2 as described later. The control circuit 1 is composed of a microcomputer and has a built-in display. As the control circuit 1, for example, a notebook personal computer can be used. However, a schematic configuration of the control circuit 1 is shown in FIG. 2 for ease of explanation. That is, in the control circuit 1, a CPU (central processing unit) 11, a RAM (random access memory) 12, and a ROM (read only memory) 13 are connected to an internal bus 14, and the internal bus 14 is a chip for timing control. It is connected to an external bus 16 via a set 15. A hard disk drive 17 and a display control circuit 18 are connected to the external bus 16, and the display control circuit 18 controls display of a display 19 according to an instruction from the CPU 11. A keyboard 20 is connected to the internal bus 14 via an operation control circuit 20a. The keyboard 20 is provided with at least alphabetic character keys and numeric keys in addition to a function key, an enter key, an arrow key, an ESC (escape) key, which will be described later.
[0008]
The interface circuit 2 basically relays measurement data (actual data) supplied from the ECU 3 to the control circuit 1 based on a command from the control circuit 1, and includes a monitor circuit 4, an analog circuit 5, and a bus. A connection circuit 6 is provided.
In the monitor circuit 4, as shown in FIG. 3, a CPU 21, a ROM 22, a RAM 23, an input / output circuit 24, and a DP (dual port) -RAM 25 are connected by a common bus. The input / output circuit 24 has a port for serial communication conforming to a standard such as RS-232C, to which not only the ECU 3 but also the temperature measurement unit 7 is connected. The CPU 21 controls the operation of the monitor circuit 4 and operates according to a program stored in the ROM 22 in advance. The RAM 23 stores data necessary for the control operation of the CPU 21, for example, a connection state at a port for serial communication at present. The DP-RAM 25 has two ports for input and output, and is for temporarily storing data supplied from the ECU 3 or a command supplied from the control circuit 1. The DP-RAM 25 is connected to the bus connection circuit 6, and this connection line includes an interrupt request line as well as a data line.
[0009]
In the analog circuit 5, as shown in FIG. 3, similarly to the monitor circuit 4, the CPU 31, the ROM 32, the RAM 33, the input / output circuit 34, and the DP-RAM 35 are connected by a common bus. However, the input / output circuit 34 includes an A / D converter, a D / A converter, and a pulse measuring device (both not shown). These are connected via a port for analog signals to an external voltage output type sensor such as a voltage output type sensor or a pen recorder (both not shown).
[0010]
The bus connection circuit 6 is for mechanically and electrically connecting each input / output of the DP-RAM 25 of the monitor circuit 4 and the DP-RAM 35 of the analog circuit 5 to the external bus 16 of the control circuit 1.
The ECU 3 connected to the data analyzer having such a configuration includes at least a CPU 51, a ROM 52, a RAM 53, a serial communication input / output circuit 54, a sensor input interface circuit 55, and an actuator drive circuit 56, as shown in FIG. They are connected to each other by a common bus. A plurality of sensors are connected to the sensor input interface circuit 55, and an actuator such as an injector is connected to the drive circuit 56. The sensors include an oxygen concentration sensor that generates an output voltage corresponding to the oxygen concentration in the exhaust gas in the exhaust pipe of the internal combustion engine, an intake pipe internal pressure sensor that generates a voltage corresponding to the absolute pressure in the intake pipe of the internal combustion engine, and an internal combustion engine. There are various sensors such as a crank angle sensor that generates a pulse signal according to the number of revolutions of the crankshaft, a cooling water temperature sensor that detects the temperature of cooling water of the internal combustion engine, and the like.
[0011]
The CPU 51 of the ECU 3 operates in accordance with a program stored in the ROM 52 in advance, reads output values of the plurality of sensors via the sensor input interface circuit 55, stores the read values in the RAM 53, and drives an actuator according to the output values of the sensors. A signal is generated and supplied to the drive circuit 56. For example, when driving the injector, the basic fuel injection amount is calculated from the intake pipe absolute pressure based on the output value of the intake pipe internal pressure sensor and the engine speed obtained from the output value of the crank angle sensor. The fuel injection amount is calculated by correcting the amount with air-fuel ratio information obtained from the output value of the oxygen concentration sensor, engine temperature information obtained from the cooling water temperature sensor, and the like, and the injector is driven according to the fuel injection amount. As described above, in the ECU 3, values such as read values of various sensors, intermediate values such as the basic fuel injection amount, and drive values such as the fuel injection amount are sequentially obtained with the lapse of time. Each value is written and updated as a real data at a predetermined address of the RAM 53. The data analyzer reads each data of the RAM 53 and analyzes the data. Therefore, during data analysis, the serial communication port of the serial communication input / output circuit 54 of the ECU 3 is connected to the serial communication port of the input / output circuit 24 of the monitor circuit 4.
[0012]
The operation when the power is turned on to the data analysis device in a state where the ECU 3 is connected to the data analysis device will be described. Naturally, it is assumed that the ECU 3 is mounted on an automobile and performs a control operation.
As shown in FIG. 5, the CPU 11 of the control circuit 1 first causes the display control circuit 18 to display a monitor image (step S1). FIG. 6 shows a monitor image, each of which is surrounded by 16 frames is a channel window for displaying parameter values obtained by the ECU 3. FIG. 7 specifically shows the contents of each display area in the channel window. In FIG. 7, “Ch No.” is displayed slightly to the left of the channel window, and is a channel number set by the user where to assign a parameter value to be displayed. The channel number in the channel window is, for example, up to 48 channels, but the number of channels simultaneously displayed on the screen is 16 types of parameters, that is, 16 channels. “Label name” is a name indicating a parameter for displaying a value. For example, if the label name is "NE", the engine speed is "TA", the engine intake temperature is "TA", and if the label name is "PBA", it is "intake pipe absolute pressure". The “monitor display value” is a hexadecimal display of the parameter displayed by the label name, and “hex” next to it indicates that the parameter is a hexadecimal number. The “physical value display” is a decimal number display that uses a unit to indicate the parameter value displayed by the label name, and the “physical value unit” next to it is the unit. For example, the physical value unit of the engine speed is rpm, and the physical value unit of the intake pipe absolute pressure is mmHg.
[0013]
The display intermittently arranged at the bottom of the monitor screen of FIG. 6 is a guide display of ten function keys f-1 to f-10 (not shown) provided on the keyboard 20 of the control circuit 1. “Setting” on the leftmost side of the screen corresponds to the function key f · 1, and then to the right corresponds to the function key number in the display order.
The CPU 11 determines whether or not the function key f · 9 corresponding to “environment” has been operated in the display state of the monitor image (step S2). When the function key f · 9 is operated, the environment setting mode is set, and the display control circuit 18 causes the selected image of the RAM address file to be displayed on the monitor image of the display 16 as a window (step S3). The RAM address file is a file that is different for each ECU or vehicle in which the ECU is mounted, and as shown in FIG. 8, a label name for each parameter, a description of the label name, an address of the internal RAM 53 of the ECU 3, a data size W / B. And LSB codes. There is a corresponding RAM address file for each ECU 3 connected to the data analysis device. A plurality of pre-registered RAM address file names are continuously displayed on a window on the display screen, and one of the plurality of RAM address file names is indicated by an arrow provided on the keyboard 20 of the control circuit 1. It is highlighted by the cursor operation with the key. After the desired RAM address file name is selected, the selection is determined by operating the enter key. After executing step S3, the CPU 11 determines whether or not the RAM address file name has been selected (step S4). When the RAM address file name of the first RAM address file is determined, the RAM address file name is read (step S5), and the display of the selected image of the RAM address file is terminated (step S6).
[0014]
The data size W / B in the RAM address file indicates whether the data is word data (2-byte data) or 1-byte data. The LSB code is a code for specifying LSB data in the LSB file. The LSB file has a file structure as shown in FIG. That is, a part consisting of a code number, which is an LSB code, a label name, a physical quantity unit, an equation number, a data length, and physical conversion parameters f0, f1,... Is LSB data corresponding to one measurement parameter. LSB data is continuously formed in the order of code numbers. The formula number is a number for specifying a conversion formula separately stored in the hard disk drive 17 for calculating a physical value from an actual value of a measurement parameter, and the physical conversion parameters f0, f1,... Are used in the conversion formula. Coefficients.
[0015]
After executing the step S6, the CPU 11 of the control circuit 1 returns to the step S2. If the function key f.9 has not been operated in step S2, it is determined whether the function key f.1 corresponding to "SETTING" has been operated (step S7). When the function key f.1 is operated, a channel setting operation is performed (step S8). That is, in the channel setting, one of a plurality of channel display frames shown on the screen of the display 19 as a monitor image is a thick line frame, which becomes the current cursor position, and which is operated by operating the arrow keys. The cursor position is movable. After positioning the cursor on the desired channel display frame with the arrow keys and operating the enter key, the label names included in the selected RAM address file are continuously displayed in a window, and the desired label names are cursored with the arrow keys. After moving the position, the selection is determined by operating the enter key. By doing so, the correspondence between the channel number and the parameter to be measured is determined, and a reception channel storage area indicating the correspondence is formed in the RAM 12. This channel setting operation can be repeatedly performed for an arbitrary number of channels. By performing the channel setting operation in this manner, for example, a reception channel storage area as shown in FIG. 10 is formed.
[0016]
The CPU 11 determines whether or not the ESC key has been operated each time the channel setting operation is performed (step S9). If the ESC key has not been operated, step S8 is repeated to further perform a channel setting operation. On the other hand, if the ESC key is operated, the control circuit 1 writes the correspondence between each channel number stored in the channel storage area and the address of the RAM in the ECU 3 into the DP-RAM 25 (step S10). For example, a data storage area is formed in the DP-RAM 25 as shown in FIG. When the control circuit 1 finishes writing the correspondence in the DP-RAM 25, it issues an interrupt signal indicating a start command for starting data communication (step S11). This interrupt signal is written as data in the DP-RAM 25.
[0017]
On the other hand, as shown in FIG. 12, the CPU 21 of the monitor circuit 4 determines whether or not an interrupt signal of a start command has been written into the DP-RAM 25 at a predetermined timing (step S51). When the interrupt signal of the start command is written, the CPU 21 starts the serial communication between the monitor circuit 4 and the ECU 3. That is, the CPU 21 sets the channel number n to 1 (step S52), reads an address corresponding to the n-th channel n-ch from the data table of the DP-RAM 25 (step S53), and outputs a data request serial signal to the read address. The data is transmitted via the input / output circuit 24 (step S54).
[0018]
When the serial signal is supplied from the monitor circuit 4 to the serial communication input / output circuit 54, the CPU 51 of the ECU 3 reads the address indicated by the serial signal and stores the read address in the RAM 53 at the storage position designated by the read address. The data value is read and supplied to the serial communication input / output circuit 54. As described above, the value stored in the storage location specified by the address is a value detected by a sensor or a calculated value such as a fuel injection amount. The serial communication input / output circuit 54 transmits the data value as a serial signal.
[0019]
After executing step S54, the CPU 21 of the monitor circuit 4 determines whether a serial signal has been supplied from the serial communication input / output circuit 54 of the ECU 3 (step S55). When the serial signal is supplied, the value indicated by the serial signal is read and written to the storage location of the DP-RAM 25 corresponding to the channel number n-ch (step S56). The CPU 21 further adds 1 to the channel number n (step S57), and the new channel number n becomes the maximum channel number n. _max It is determined whether it is larger than (for example, 48) (step S58). n ≦ n _max In this case, the flow returns to step S53 to repeat the above operation for the next channel number. n> n _max In this case, the flow returns to step S52 to repeat the above operation for the first channel 1-ch.
[0020]
By performing such a serial communication operation, the data value (hexadecimal data) read from the RAM 53 for each channel is written in the DP-RAM 25 in the reading order. The writing position of the DP-RAM 25 is incremented for each channel by a counter (not shown), and when reaching the last writable storage position, the counter is reset and the next writing position returns to the first storage position. It has become.
[0021]
When such a serial communication operation is started, the CPU 21 of the monitor circuit 4 generates an interrupt signal at a predetermined timing (for example, every 100 msec). This interrupt signal is written to a predetermined storage location of the DP-RAM 25, so that it is transmitted to the CPU 11 of the control circuit 1. Therefore, as shown in FIG. 13, the CPU 11 determines whether the function key f · 6 corresponding to “log” has been operated (step S21). When the function key f · 6 is operated, the mode becomes the data storage mode, and the time data at the time when the operation of the function key f · 6 is detected is obtained from the time counter (not shown) held in the control circuit 1 itself. The data is read and written into the header of the received data storage area (step S22). This time data indicates the data recording start time, and includes the year, month, and date and time. The CPU 11 reads the measurement data of each channel of the DP-RAM 25 in response to the interrupt signal at a predetermined timing (step S23), and writes the read measurement data to the storage position of the reception data storage area of the RAM 12 in association with the channel. (Step S24), the data counter provided at the head of the storage position of the written reception data storage area is incremented by 1 (Step S25). Since this data reading operation is performed via the external bus 16, it is extremely faster than the data transmission speed of the serial communication. Therefore, one data of all the channels already written in the DP-RAM 25 is read and the received data is stored. Written to the area. The data counter indicates the number of read data common to all channels. In the DP-RAM 25, the storage position of the data read by the CPU 11 is marked for each channel by a counter (not shown) so that new data can be written. The reception data storage area is, for example, as shown in FIG.
[0022]
When the CPU 11 finishes writing data to the reception data storage area, the CPU 11 determines whether the function key f · 7 corresponding to “stop” has been operated (step S26). If the function key f.7 is not operated, the CPU waits for the next interrupt signal from the CPU 21 of the monitor circuit 4. On the other hand, when the function key f.7 is operated, an interrupt signal indicating a stop command for stopping data communication is issued (step S27). Since the capacity of the reception data storage area of the RAM 12 is limited, an interrupt signal indicating a stop command is also generated when the final storage position is reached.
[0023]
The interrupt signal indicating this stop command is written as data in the DP-RAM 25. Therefore, as shown in FIG. 15, the CPU 21 of the monitor circuit 4 determines whether or not a stop command interrupt signal has been written into the DP-RAM 25 at a predetermined timing (step S61). When the interruption of the stop command is written, the CPU 21 controls the input / output circuit 24 to stop the serial communication between the monitor circuit 4 and the ECU 3 (step S62).
[0024]
After executing step S27, the CPU 11 of the control circuit 1 determines whether the function key f · 8 corresponding to “save” has been operated (step S28). When the function key f · 8 is operated, the contents of the reception data storage area of the RAM 12 are stored in the hard disk drive 17 as a data file (step S29). At the time of this storage, the file name is given by the user. If the function key f · 8 is not operated, the contents of the reception data storage area of the RAM 12 are maintained as they are.
[0025]
The CPU 11 of the control circuit 1 performs a screen display operation as a background process of the serial communication operation. In this screen display operation, the latest measurement data (hexadecimal data) of each channel is read from the data table of the DP-RAM 25 as shown in FIG. 16, and each channel is stored in the latest data storage area in the RAM 12 as shown in FIG. For each channel (step S31), the channel number m is set to 1 (step S32), the LSB code corresponding to the m-th channel m-ch is read from the channel storage area of the RAM 12 (step S33), and specified by the LSB code. The contents of the LSB file are read (step S34). Since data such as a physical quantity unit, a formula number, a data length, and a physical conversion parameter can be obtained from the LSB file, the conversion formula specified by the formula number is read from the ROM 13 and the physical conversion parameter and the read m-th A physical value is calculated by applying the latest data of the channel (step S35). The CPU 11 writes the physical value of the calculation result in the result data storage area in the RAM 12 as shown in FIG. 18 in association with the m-th channel m-ch (step S36), and adds 1 to the channel number m (step S37). ), The new channel number m is the maximum channel number n _max It is determined whether the value is larger (step S38). m ≦ n _max In this case, the flow returns to step S32 to repeat the above operation for the next channel number. m> n _max In this case, a display command is issued to the display control circuit 18 (step S39).
[0026]
This display command is issued in accordance with the latest data storage area, the result data storage area, and the physical quantity unit of the LSB file. The display control circuit 18 displays the latest data for each channel obtained from the latest data storage area in the monitor display value area shown in FIG. 7 in the display window of the corresponding channel on the monitor video screen displayed on the display 19. The physical value of the calculation result for each channel obtained from the data storage area is displayed in the physical value display area shown in FIG. 7 in the display window of the corresponding channel, and the physical quantity unit of the LSB file for each channel is displayed for the corresponding channel. It is displayed in the physical value unit display area shown in FIG. 7 in the display window.
[0027]
Instead of displaying the physical values numerically, it is also possible to display a graph as shown in FIG. 19 by operating the function key f · 3 corresponding to “Graph” on the monitor video screen.
The CPU 11 of the control circuit 1 determines whether the function key f · 10 corresponding to “end” has been operated (step S30). When the function key f · 10 has been operated, this routine ends. As described above, since the data of a plurality of channels is obtained from the ECU 3 and stored in the reception data storage area of the RAM 12 or the hard disk drive 17, the operation shifts to the operation of analyzing and displaying these data.
[0028]
Therefore, an operation of analyzing and displaying the measured actual data on the display 19 will be described. In the analysis display operation, the CPU 11 of the control circuit 1 first instructs the display control circuit 18 to display a time chart basic image as shown in FIG. 20 (step S81). The basic image of the time chart is predetermined as data in the display control circuit 18, and the data of the basic image of the time chart is not analyzed and displayed, but only a pull-down menu is displayed at the top. Next, a data file having the measurement data to be displayed is determined (step S82). This is performed by reading the selection result because the user selects a file name from a pull-down menu on the screen by key operation. When the data file is determined, the data file specified by the file name is read from the hard disk drive 17 (step S83). The specified data file But c If the data is not yet stored in the hard disk drive 17, it is read from the RAM 12. Then, a label name related to the measurement data to be displayed is determined from the label names included in the read data file (step S84). This is also performed by reading the selection result because the user selects a label name from a pull-down menu on the screen by key operation. Alternatively, the measurement parameters assigned to each channel included in the header portion of the read data file, ie, the label names, are read out, displayed on a window, and key operations are performed from among the displayed plurality of label names. Can also be selected. When the label name is specified, the CPU 11 can know the corresponding channel number from the header of the data file.
[0029]
After executing step S84, the CPU 11 reads the recording start time, the final data counter value, and the sampling period included in the header of the read data file (step S85), and calculates the display data period from the final data counter value (step S86). ). That is, the final data counter value indicates the number of data of each channel of the read data file. Since the number of dots that can be displayed on the side of the display 19 is known in advance, the final data counter value / the number of dots can be obtained. The nearest integer less than or equal to the value is the display data period. For example, if the final data counter value is 10000 and the number of dots is 512, 10000/512 = 19.53, so the display data cycle is 19. In this case, one data is displayed for every 19 data.
[0030]
Next, the CPU 11 sets the variable C to 1 (step S87), reads the measurement data of each channel corresponding to the data counter value C of the read data file (step S88), and sets the data counter value C to the sampling period. , And the recording start time is added thereto, and the calculation result is used as time data (step S89). The data read in step S88 is only the channel corresponding to the label name determined in step S84. The read measurement data and calculated time data are supplied to the display control circuit 18 (step S90). Then, the display data cycle calculated in step S86 is added to the variable C to make it a new variable C (step S91), and it is determined whether or not the variable C has exceeded the final data counter value (step S92). If the variable C has not exceeded the final data counter value, the flow returns to step S88 to repeat the above operation. If the variable C exceeds the final data counter value, the measured data to be displayed has been read from the data file. The display control circuit 18 displays a time chart image on the screen of the display 19 based on the supplied measurement data and time data, for example, as shown in FIG. That is, each time measurement data and time data are supplied, coordinate points are set as time data in the X-axis direction and measurement data in the Y-axis direction, and the coordinate points are connected by a straight line for each of the same parameters. The time data is displayed along the X-axis as scale values at seven points at predetermined regular intervals. The unit in the Y-axis direction corresponds to the unit of any one parameter, and can be arbitrarily switched. In the case of FIG. 21, the engine speed is selected as can be seen from the fact that "NE" is surrounded by a frame in the "Ch" column at the top of the time chart image.
[0031]
In the above-described embodiment, an example in which the electronic fuel injection device is used as the electronic control device has been described, but the present invention is not limited to this. The present invention can be applied to an electronic control device such as an ignition timing control device, an air-fuel ratio control device, and a throttle opening control device for an internal combustion engine, and can also be applied to other electronic control devices.
[0032]
In the above-described embodiment, the measurement data is extracted from the ECU by serial communication. However, the present invention is not limited to this, and it is clear that parallel communication may be used.
[0033]
【The invention's effect】
The data analysis device of the electronic control device of the present invention According to Even when a large number of data is obtained during the data measurement period, the change in the overall data level during the data measurement period can be accurately displayed.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is a block diagram illustrating a schematic configuration of a control circuit.
FIG. 3 is a block diagram illustrating a configuration of an interface circuit.
FIG. 4 is a block diagram illustrating a configuration of an ECU.
FIG. 5 is a flowchart showing the operation of the CPU of the control circuit.
FIG. 6 is an example of a monitor image display.
FIG. 7 is a diagram partially showing details of the monitor image display of FIG. 6;
FIG. 8 is a diagram showing a structure of a RAM address file.
FIG. 9 is a diagram showing a structure of an LSB file.
FIG. 10 is a diagram showing a data table of a reception channel storage area.
FIG. 11 is a diagram showing a data table of a data storage area.
FIG. 12 is a flowchart showing the operation of the CPU of the monitor circuit.
FIG. 13 is a flowchart showing the operation of the CPU of the control circuit.
FIG. 14 is a diagram showing a data table of a reception data recording area.
FIG. 15 is a flowchart showing the operation of the CPU of the monitor circuit.
FIG. 16 is a flowchart showing the operation of the CPU of the control circuit.
FIG. 17 is a diagram showing a data table of a latest data storage area.
FIG. 18 is a diagram showing a data table of a result data storage area.
FIG. 19 is a diagram showing a graph display example.
FIG. 20 is a flowchart showing a time chart display operation of the CPU of the control circuit.
FIG. 21 is a diagram showing a display example of a time chart image.
[Description of Signs of Main Parts]
1 control circuit
2 Interface circuit
3 ECU
4 Monitor circuit
5 Analog circuit
6 Bus connection circuit

Claims (4)

A data analyzer that performs data display on a display based on actual data of detection or control parameters obtained during control in an electronic control device,
Real data storage means for sequentially obtaining real data of at least one parameter from the electronic control device and storing the data as a data group;
And dividing means for the number of data of one data group obtained from the real data storage unit, dividing the screen displayable number of dots of a predetermined direction of said display,
And thinning rather thinning means the data of said one data group based on the division result of the division means,
Conversion data storage means which stores conversion data including a conversion formula for converting actual data into physical values for each of a plurality of parameters in advance,
Conversion means for sequentially converting each data after thinning out from the data of the one data group into physical values according to a conversion formula in the conversion data obtained from the conversion data storage means;
Display control means for sequentially displaying physical values sequentially obtained from the conversion means on the display with the predetermined one direction as a time axis, and a display control means . The thinning-out means leaves data at a rate of one data for each data number that is an integer value equal to or less than a value obtained by dividing the number of data of the one data group by the number of dots that can be displayed on the screen. 2. The data analysis device for an electronic control device according to claim 1, wherein the data analysis device thins out the data. 3. The data analysis of the electronic control device according to claim 1, wherein the thinning unit performs the thinning based on a recording start time at which the actual data detection is started, a final data counter value, and a sampling cycle. apparatus. 4. The data analysis device according to claim 1 , wherein the actual data storage means is a semiconductor memory or a hard disk drive.

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