JP6885177B2 - Electronic control device - Google Patents

Description

The present invention relates to an electronic control device.

Conventionally, a map showing the correspondence between a representative value and a map value is used. For example, when a sensor value output from a sensor is input, interpolation processing is performed using the input sensor value as a search value to correspond to the search value. A technique for specifying an interpolated value is disclosed. In the interpolation process, the search process is first performed, the magnitude of the search value and the representative value is sequentially determined, and the calculation area is specified by searching between the representative values corresponding to the search value. In the interpolation process, a linear interpolation calculation process is subsequently performed, and the map value of the calculation area specified by the search process is linearly interpolated to specify the interpolation value. In this way, in the interpolation process, the search process and the linear interpolation calculation process are sequentially performed to specify the interpolation value corresponding to the search value (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2004-1902028

By the way, there are cases where the map values are all the same in all the areas to be interpolated in the map. If all the map values are the same in all the areas to be interpolated in the map, the interpolated value will be the same as the map value regardless of the linear interpolation operation of the map value in any calculation area. However, even if the map values are all the same in all the areas to be interpolated in the map, if the interpolation processing is uniformly performed, the interpolation value is specified by the amount of the search processing and the linear interpolation calculation processing. It takes a long time to process.

Further, in the area to be interpolated in the map, an area in which all the map values are the same in some rows or columns and all the map values are the same in some rows or columns may be specified as the calculation area. If all the map values are the same in some rows or columns specified as the calculation area, the interpolation value will be the same as the map value even if the map value in the calculation area is linearly interpolated. However, even if the map values are all the same in some rows or columns specified as the calculation area in the area to be interpolated in the map, if the entire linear interpolation calculation process is uniformly performed, it is linear. Since the entire interpolation calculation process is performed, the processing time until the interpolation value is specified becomes longer.

To solve the problem that the processing time until the interpolation value is specified becomes long, the clock frequency of the arithmetic unit that performs the interpolation processing is increased to improve the processing capacity, or a plurality of cores are mounted on the arithmetic unit. A configuration is envisioned in which a multi-core system that reduces the load on each core is introduced. However, in a configuration in which the clock frequency of the arithmetic unit is increased, new problems such as increased power consumption, heat generation amount, and noise occur. In addition, in a configuration in which a multi-core system is introduced, new problems such as high cost for developing all the functions corresponding to the multi-core system from scratch occur. Under these circumstances, a technique for shortening the processing time until the interpolated value is specified without increasing the clock frequency of the arithmetic unit or introducing a multi-core system is desired.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electronic control device capable of appropriately shortening the processing time until the interpolation value corresponding to the search value is specified. is there.

According to the invention described in claim 1, the map storage unit (6a) stores a map showing the correspondence between the representative value and the map value. As the interpolation process using the map, the calculation unit (5) performs a search process of searching between the representative values corresponding to the search values to specify the calculation area, and a linear interpolation calculation of the map value of the calculation area specified by the search process. It is possible to perform linear interpolation calculation processing for specifying the interpolation value. The calculation unit performs at least linear interpolation when the calculation area is a row or column in which the map values are all the same in at least a part of the area to be interpolated in the map and at least all the map values are the same. Specify the interpolated value without performing part or all of the arithmetic processing. The flag storage unit (7) stores a flag that can specify whether or not all the map values are the same in all the areas to be interpolated in the map. The calculation unit determines whether or not all the map values are the same in all the areas to be interpolated in the map, stores the determination result in the flag storage unit, and then determines the determination result stored in the flag storage unit. If it is determined that all the map values are the same in all the areas to be interpolated in the map, the interpolation value is specified without performing the search process and the linear interpolation calculation process.

When the calculation area is a row or column in which the map values are all the same in at least a part of the area to be interpolated in the map and at least all the map values are the same, the interpolation process is linear with the search process. Instead of uniformly executing the interpolation calculation process and specifying the interpolation value, the interpolation value is specified without performing at least a part or the whole of the linear interpolation calculation process in the interpolation process. By not performing at least a part or the whole of the linear interpolation calculation process, it is possible to save at least the time spent on a part or the whole of the linear interpolation calculation process, and appropriately shorten the processing time until the interpolation value is specified. Can be done. In this case, since it can be realized by improving the program and changing the software, it is not necessary to increase the clock frequency of the arithmetic unit or introduce a multi-core system.

Functional block diagram showing an embodiment of the present invention Diagram showing the map Diagram showing the flow of linear interpolation operation (Part 1) Flowchart showing equivalence determination processing Flowchart showing equal value judgment processing for each line Flowchart showing equal value judgment processing for each column Flowchart showing the same value determination process for all areas Flowchart showing equal value judgment processing for all maps Flowchart showing interpolation value identification process The figure which shows the mode of specifying an interpolated value (the 1) The figure which shows the mode of specifying the interpolated value (the 2) The figure which shows the mode of specifying the interpolated value (the 3) The figure which shows the mode of specifying the interpolated value (the 4) The figure which shows the mode of specifying an interpolated value (the 5) Diagram showing the flow of linear interpolation operation (Part 2)

Hereinafter, an embodiment in which the present invention is applied to, for example, an electronic control device for controlling the drive of an engine mounted on a vehicle will be described with reference to the drawings. As shown in FIG. 1, the electronic control device 1 includes a microcomputer (hereinafter referred to as a microcomputer) 2 and a data transfer unit 3. The data transfer unit 3 controls data transfer to and from the bus 4 mounted on the vehicle. The bus 4 is, for example, CAN (registered trademark), CXPI (registered trademark), FlexRay (registered trademark), MOST (registered trademark), LIN and the like.

The microcomputer 2 has a CPU 5 (corresponding to a calculation unit), a ROM 6, and a RAM 7 (corresponding to a flag storage unit), and they are interconnected via a bus 8. The ROM 6 has a map storage unit 6a that stores a program executed by the CPU 5 and stores maps 1 to p (p is a natural number), and a parameter storage unit 6b that stores the parameters of the maps 1 to p. The parameters of maps 1 to p and maps 1 to p are used when the CPU 5 performs the interpolation process. The parameters of maps 1 to p are parameters that can be arbitrarily set by the user. The RAM 7 stores the flag group of the maps 1 to p and the flag group of all maps equal value determination completion. The flag group of maps 1 to p and the flag for completing the determination of the same value for all maps are also used when the CPU 5 performs the interpolation process.

The flag group of maps 1 to p includes an equivalence determination completion flag, an equivalence flag for each row, an equivalence flag for each column, and an equivalence flag for all areas. The equivalence determination completion flag is a flag indicating whether or not the equivalence determination of the map values has been completed for the area to be interpolated in the map. Each row equivalence flag is a flag indicating whether or not all the map values are the same in some rows in the area to be interpolated in the map. Each column equivalence flag is a flag indicating whether or not all the map values are equivalent in some columns in the area to be interpolated in the map. The all area equivalence flag is a flag indicating whether or not all the map values are the same in all the areas to be interpolated by the map. The all-map equal value determination completion flag is a flag indicating whether or not the equal value determination of the map values has been completed for all the maps to be the target of the equal value determination.

The CPU 5 can access the ROM 6 and the RAM 7 via the bus 8. By accessing the ROM 6, the CPU 5 reads out the program, the parameters of the maps 1 to p and the parameters of the maps 1 to p from the ROM 6. By accessing the RAM 7, the CPU 5 sets the on / off of the flag group of the maps 1 to p, and sets the on / off of the all-map equal value determination completion flag.

The data transfer unit 3 connects the sensor 9 via the bus 4, and inputs a sensor signal including the sensor value detected by the sensor 9 via the bus 4. Further, the data transfer unit 3 directly connects the sensor 10 and directly inputs a sensor signal including the sensor value detected by the sensor 10. The sensors 9 and 10 are sensors that detect sensor values required to control the drive of the engine. For example, a water temperature sensor that detects the temperature of the cooling water of the engine, a rotation that detects the rotation speed and the rotation angle position of the engine. An angle sensor, an intake air temperature sensor that detects the temperature of the intake air, an intake pressure sensor that detects the pressure of the intake air, a throttle opening sensor that detects the opening degree of the throttle valve, and the like. When the sensor signals output from the sensors 9 and 10 are input to the data transfer unit 3, the CPU 5 causes the temperature of the cooling water of the engine, the number and angle of rotation of the engine, the temperature of the intake air, and the pressure of the intake air. , The opening degree of the throttle valve, etc. is specified, and the engine drive is controlled using the specified result.

Here, the interpolation process using the map will be described. When the sensor signals output from the sensors 9 and 10 are input to the data transfer unit 3, the CPU 5 uses the sensor values included in the sensor signals as search values, performs interpolation processing using a map, and uses the search values as search values. Identify the corresponding interpolated value. Here, the case where the sensor value included in the sensor signals input from the sensors 9 and 10 is used as the search value will be described, but the case where the control value calculated when the CPU 5 executes various control processes is used as the search value. Is the same. The CPU 5 first performs a search process, sequentially determines the magnitude of the search value and the representative value, searches between the representative values corresponding to the search value, and specifies the calculation area. The CPU 5 subsequently performs a linear interpolation calculation process, and linearly interpolates the map value of the calculation area specified by the search process to specify the interpolated value. The CPU 5 performs a search process and a linear interpolation calculation process as the interpolation process, and specifies the interpolation value corresponding to the search value.

As shown in FIG. 2, the two-dimensional map is used as the target of the interpolation processing, and the map values Z11 to Z55 are stored corresponding to the representative values X1 to X5 on the X-axis and the representative values Y1 to Y5 on the Y-axis. Explain the case. When the CPU 5 first performs the search process and specifies "X1 ≦ X ≦ X2, Y1 ≦ Y ≦ Y2" with respect to the search value (X, Y), the calculation area is X1 column, X2 column, Y1 row, Identify line Y2. The CPU 5 subsequently performs a linear interpolation calculation process, and linearly interpolates the map values of X1, X2, Y1, and Y2 specified as the calculation area according to the procedure shown in FIG. 3 to specify the interpolation value Z.

That is, the CPU 5 uses (X1, Y1, Z11) and (X2, Y1, Z12) to calculate the interpolation value Za by the following arithmetic expression.
Za = ((Z12-Z11) / (X2-X1) x (X-X1) + Z11)
Next, the CPU 5 uses (X1, Y2, Z21) and (X2, Y2, Z22) to calculate the interpolation value Zb by the following arithmetic expression.
Zb = ((Z22-Z21) / (X2-X1) x (X-X1) + Z21)
Then, the CPU 5 uses (X, Y1, Za) and (X, Y2, Zb) to calculate the interpolation value Z by the following arithmetic expression.
Z = ((Zb-Za) / (Y2-Y1) x (Y-Y1) + Za)

In this way, the CPU 5 specifies the interpolated value Z corresponding to the search value (X, Y). That is, when the CPU 5 performs the interpolation process with, for example, the X-axis as the representative value of the temperature of the cooling water of the engine and the Y-axis as the representative value of the rotation speed of the engine, the temperature of the cooling water of the engine and the rotation speed of the engine become The control data that depends on the correspondence is specified as the interpolation value.

As described above, the map values may be the same in all the areas to be interpolated in the map, or the map values may be the same in some rows or columns specified as the calculation area in the area to be interpolated in the map. .. Even in such a case, if the above-mentioned interpolation processing is uniformly performed, the processing time until the interpolation value is specified becomes long. In consideration of this point, the CPU 5 performs the following processing in the present embodiment.

Next, the operation of the above configuration will be described with reference to FIGS. 4 to 15. Here, the map that is the target of the equivalence determination process is referred to as the equivalence determination target map, and the map that is the target of the interpolation value identification process is referred to as the interpolation value specification target map. The CPU 5 executes the equivalence determination process according to the program read from the ROM 6, performs the equivalence determination of the map values in the map for the equivalence determination target, and stores the determination result in the RAM 7 as a flag group of the map. Further, the CPU 5 executes the equivalence determination process for all maps according to the program read from the ROM 6, performs the equivalence determination of the map values in all the maps subject to the equivalence determination, and uses the determination result as the all map equivalence determination completion flag in the RAM 7. Remember. Further, the CPU 5 performs the interpolation value specifying process according to the program read from the ROM 6, and specifies the interpolation value in the interpolation value specifying target map. Hereinafter, the equivalence determination process, the all-map equivalence determination process, and the interpolation value identification process performed by the CPU 5 will be sequentially described.

(1) Equivalent judgment processing As a map for equal value judgment, map 1 which is a two-dimensional map of N rows × M columns (N and M are natural numbers of 2 or more) is represented, and the variable indicating the row of the map is set to “i”. Let "k" be the variable that indicates the columns of the map.

As shown in FIG. 4, when the CPU 5 starts the equivalence determination process of the map 1, it determines whether or not the equivalence determination completion flag of the map 1 is on, and whether or not the equivalence determination of the map 1 is completed. Is determined (S1). When the CPU 5 determines that the equivalence determination completion flag of the map 1 is on and determines that the equivalence determination of the map 1 is completed (S1: YES), the CPU 5 completes the equivalence determination process of the map 1. On the other hand, when the CPU 5 determines that the equivalence determination completion flag of the map 1 is not turned on and determines that the equivalence determination of the map 1 is not completed (S1: NO), N indicating the number of rows of the map 1 is set to "ROW". M, which indicates the number of columns in the map 1, is stored in "COLUMN" (S2), and the process proceeds to each row equivalence determination process (S3).

As shown in FIG. 5, when the CPU 5 starts the equivalence determination process for each row, i is set to "1", k is set to "2" (S11), and the map value of i row × 1 column and i row are set. The map values in column × k are compared with each other, and it is determined whether or not they have the same value (S12). When the CPU 5 determines that the map value of i-row × 1 column and the map value of i-row × k column are the same value (S12: YES), k is compared with “COLUMN” (S13). When the CPU 5 determines that k is less than "COLUMN" (S13: YES), the CPU 5 increments k so as to determine that the map value is the same as that of the next column (S14), and returns to step S12 described above. On the other hand, when the CPU 5 determines that k is not less than "COLUMN" and k has reached "COLUMN" (S13: NO), it identifies that all the map values of row i are the same (S15), and the map 1 The i-row equivalence flag is set to on, the i-row equivalence determination is completed, and i and "ROW" are compared (S16).

On the other hand, when the CPU 5 determines that the map value of i-row × 1 column and the map value of i-row × k column are not the same value (S12: NO), the CPU 5 specifies that the map value of i-row × 1 column is not the same value (S17). The i-row equivalence flag of the map 1 is set to off, the i-row equivalence determination is completed, and i and "ROW" are compared (S16). When the CPU 5 determines that i is less than "ROW" (S16: YES), it increments i so as to perform the equivalence determination on the next line (S18), sets k to "2" (S19), and sets it to "2". The process returns to step S12 described above. On the other hand, when the CPU 5 determines that i is not less than "ROW" and i has reached "ROW" (S16: NO), the CPU 5 completes the equivalence determination of all rows, completes the equivalence determination processing of each row, and has the same value. Return to the judgment process.

That is, the CPU 5 determines whether or not the interpolation value (Z11) of the first column, which is the reference of the first row, and the other interpolation values (Z12 to Z15) of the second and subsequent columns are all the same value. If they are all the same value, it is specified that the map values in the first line are all the same value. On the other hand, the CPU 5 specifies that the map values in the first row are not the same if they are not the same in any of the columns in the middle. When the CPU 5 completes the determination of the same value of the map values in the first row, the CPU 5 also performs the determination of the same value of the map values in the second and subsequent rows according to the same procedure.

When the CPU 5 returns to the equivalence determination process, the CPU 5 shifts to the equivalence determination process for each column (S4). As shown in FIG. 6, when the CPU 5 starts the equivalence determination process for each column, i is set to "2" and k is set to "1" (S21), and the map value of 1 row × k column and i The map values in rows and columns are compared with each other, and it is determined whether or not they have the same value (S22). When the CPU 5 determines that the map value of 1 row × k column and the map value of i row × k column are the same value (S22: YES), i and “ROW” are compared (S23). When the CPU 5 determines that i is less than "ROW" (S23: YES), it increments i so as to perform the same value determination as the next line (S24), and returns to step S22 described above. On the other hand, when the CPU 5 determines that i is not less than "ROW" and i has reached "ROW" (S23: NO), it identifies that all the map values in column k are the same (S25), and the map 1 The k-column equivalence flag of is set to on, the k-column equivalence determination is completed, and k is compared with "COLUMN" (S26).

On the other hand, when the CPU 5 determines that the map value of i row × k column and the map value of i row × k column are not the same value (S22: NO), the CPU 5 identifies that the map value of k column is not the same value (S27). The k-column equivalence flag of map 1 is set to off, the k-column equivalence determination is completed, and k is compared with "COLUMN" (S26). When the CPU 5 determines that k is less than "COLUMN" (S26: YES), it increments k so as to perform the equivalence determination in the next column (S28), sets i to "2" (S29), and sets i to "2". The process returns to step S22 described above. On the other hand, when the CPU 5 determines that k is not less than "COLUMN" and k has reached "COLUMN" (S26: NO), the CPU 5 completes the equivalence determination of all columns and completes the equivalence determination process for each column. Return to the equivalence determination process.

That is, the CPU 5 determines whether or not the interpolation value (Z11) of the first row, which is the reference of the first column, and the other interpolation values (Z21 to Z51) of the second and subsequent rows are all the same value. If they are all the same value, it is specified that the map values in the first column are all the same value. On the other hand, the CPU 5 specifies that the map values in the first column are not the same if they are not the same in any of the rows in the middle. When the CPU 5 completes the determination of the same value of the map values in the first column, the CPU 5 also performs the determination of the same value of the map values in the second and subsequent columns according to the same procedure.

When the CPU 5 returns to the equal value determination process, the CPU 5 shifts to the all area equal value determination process (S5). As shown in FIG. 7, when the CPU 5 starts the all-region equivalence determination process, it determines whether or not the equivalence determination result of each row and the equivalence determination result of each column are all the same value (S31). When the CPU 5 determines that the equivalence determination result of each row and the equivalence determination result of each column are all the same value (S31: YES), the CPU 5 identifies that the map values of all the areas are all the same value (S32), and the all areas are the same value. The flag is set to on, the equivalence determination process for all areas is completed, and the process returns to the equivalence determination process. On the other hand, when the CPU 5 determines that the equivalence determination result of each row and the equivalence determination result of each column are not the same value (S31: NO), it specifies that the map values of all areas are not the same value (S33), and sets the all area equivalence flag. Set to off, complete the equivalence determination process for all areas, and return to the equivalence determination process.

When the CPU 5 returns to the equivalence determination process, the equivalence determination of the map 1 is completed, the equivalence determination completion flag is set to ON (S6), and the equivalence determination process is completed.
(2) All Map Equivalent Determination Process As shown in FIG. 8, the CPU 5 executes all map equivalence determination processing, and performs equivalence determination processing for all of maps 1 to p. When the CPU 5 starts the all-map equality determination process, it determines whether or not the all-map equality determination completion flag is on, and determines whether or not the all-map equality determination is completed (S41). When the CPU 5 determines that the equivalence determination completion flag for all maps is on and determines that the equivalence determination for all maps is completed (S41: YES), the CPU 5 completes the equivalence determination process for all maps. On the other hand, when the CPU 5 determines that the equivalence determination completion flag for all maps is not turned on and determines that the equivalence determination for all maps has not been completed (S41: NO), the equivalent value determination target map is determined according to a preset setting order. Are sequentially set, and the same value determination process is performed for maps 1 to p.

When the CPU 5 sequentially sets the equivalence determination target maps in ascending order, for example, the equivalence determination process of the map 1, the equivalence determination process of the map 2, the equivalence determination process of the map 3, ..., The equivalence of the map (p-1) The determination process and the equivalence determination process of the map p are sequentially performed (S42 to S46). When the CPU 5 completes the equal value determination of all the maps to be determined to have the same value, the CPU 5 sets the all map equal value determination completion flag to ON (S47), and completes the all map equal value determination process.

(3) Interpolation value specifying process As shown in FIG. 9, when the CPU 5 starts the interpolation value specifying process, it determines the equivalence flag for all areas, and all the map values are the same in all the areas to be interpolated in the interpolation value specifying target map. It is determined whether or not it is (S51). When the CPU 5 determines that the all area equivalence flag is on and determines that all the map values are the same in all the interpolation target areas of the interpolation value specific target map (S51: YES), the designated point specified in advance The map value of is specified as the interpolation value Z (S52), and the interpolation value specifying process is completed.

On the other hand, when the CPU 5 determines that the all-region equivalence flag is off and determines that the map values are not the same in all the interpolation target regions of the interpolation value specific target map (S51: NO), the search process is performed. That is, the CPU 5 sequentially determines the magnitude of the search value and the representative value, searches between the representative values corresponding to the search value, and specifies the calculation area. When the CPU 5 specifies "Xa ≦ X <Xb, Ya ≦ Y <Yb" with respect to the search value (X, Y) and specifies the Xa column, the Xb column, the Ya row, and the Yb as the calculation area, (Xa, The map value Z1 of Ya), the map value Z2 of (Xb, Ya), the map value Z3 of (Xa, Yb), and the map value Z4 of (Xb, Yb) are acquired (S53). The CPU 5 determines whether or not a predetermined condition is satisfied for the specified map values of the Xa column, the Xb column, the Ya row, and the Yb row (S54). In this case, the CPU 5 has the same map values in the Ya row, Yb row, Xa column, and Xb column, the map values in the Ya row, Yb row, and Xa column are all the same value, and the Ya row and Yb row. , Xb column map values are all the same value, whichever is a predetermined condition.

When the CPU 5 determines that the predetermined condition is satisfied (S54: YES), the CPU 5 specifies the map value of the designated point designated in advance as the interpolation value Z (S55), and completes the interpolation value specifying process. On the other hand, when the CPU 5 determines that the predetermined condition is not satisfied (S54: NO), the CPU 5 determines whether or not all the map values of the Ya row are the same value (S56). When the CPU 5 determines that the Ya row equivalence flag is on and determines that all the map values of the Ya row are the same (S56: YES), the CPU 5 specifies the map value of the specified point specified in advance as the interpolation value Za. (S57). On the other hand, when the CPU 5 determines that the Ya row equivalence flag is off and determines that the map values of the Ya row are not equal, (S56: NO), (Xa, Ya, Z1) and (Xb, Ya, Z2) are displayed. The linear interpolation calculation process is performed using the above method, and the interpolation value Za is specified by the following calculation formula (S58).
Za = ((Z2-Z1) / (Xb-Xa) × (X-Xa) + Z1)

The CPU 5 determines whether or not all the map values in the Yb row are the same (S59). When the CPU 5 determines that the Yb line equivalence flag is on and determines that all the map values of the Yb line are the same (S59: YES), the CPU 5 specifies the map value of the specified point specified in advance as the interpolation value Zb. (S60). On the other hand, when the CPU 5 determines that the Yb row equivalence flag is off and determines that the map values of the Yb row are not equivalent (S59: NO), it determines (Xa, Yb, Z3) and (Xb, Yb, Z4). The linear interpolation calculation process is performed using the above method, and the interpolation value Zb is specified by the following calculation formula (S61).
Zb = ((Z4-Z3) / (Xb-Xa) × (X-Xa) + Z3)

When the CPU 5 specifies the interpolation value Za and the interpolation value Zb, the CPU 5 executes linear interpolation calculation processing using (X, Ya, Za) and (X, Yb, Zb), and specifies the interpolation value Z by the following calculation formula. (S62).
Z = ((Zb-Za) / (Yb-Ya) × (Y-Ya) + Za)

When the CPU 5 specifies the interpolation value Z, the CPU 5 completes the interpolation value specifying process.
The specifics will be described below. As shown in FIG. 10, if the map values Z11 to Z55 are all the same value of "1.00" in the entire area of the interpolation target of the interpolation value specific target map, the CPU 5 performs the search process and the linear interpolation calculation process. Specify the map value of the specified point as the interpolation value without doing so. If (X1, Y1) is designated as a designated point in advance, the CPU 5 specifies the map value Z11 as the interpolation value Z. In this case, the CPU 5 does not perform the search process and the linear interpolation calculation process, so that the time spent on the search process and the linear interpolation calculation process can be omitted, and the processing time until the interpolation value Z is specified is shortened. be able to. The CPU 5 may specify a point other than (X1, Y1) as a designated point.

Further, as shown in FIG. 11, in the CPU 5, the map values Z11 to Z15 are all the same value of "1.00" in the Y1 row of the interpolation value specifying target map, but the map values are not the same in other rows and columns. In this case, when the search process is performed to specify "Y1 ≦ Y ≦ Y2" for the search value Y and the Y1 line and the Y2 line are specified as the calculation area, the interpolation value is specified as follows. Since the map values Z11 and Z12 used in the linear interpolation calculation process for calculating the interpolation value Za are the same value, the CPU 5 specifies the map value of the designated point as the interpolation value. If (X1, Y1) is designated as a designated point in advance, the CPU 5 specifies the map value Z11 as the interpolated value Za. In this case, the CPU 5 does not perform the linear interpolation calculation process for calculating the interpolation value Za, so that the time spent on the linear interpolation calculation process can be saved. The CPU 5 may specify a point other than (X1, Y1) as a designated point as long as it is a point on the Y1 line. For example, (X5, Y1) is specified as a designated point, and the map value Z15 is interpolated value Za. It may be specified as.

Further, the case where the map values Z11 to Z15 in the Y1 row of the interpolation value specific target map are all the same value has been described above, but the map values Z21 to Z25 in the Y2 row of the interpolation value specific target map are all the same value. The same applies when the search process is performed and "Y1 ≦ Y ≦ Y2" is specified for the search value Y when the map values of other rows and columns are not the same value. If the CPU 5 specifies (X1, Y2) as the designated points in advance, the CPU 5 specifies the map value Z21 as the interpolated value Zb. In this case, the CPU 5 does not perform the linear interpolation calculation process for calculating the interpolation value Zb, so that the time spent on the linear interpolation calculation process can be saved.

Further, as shown in FIG. 12, the map values Z11 to Z15 in the Y1 row of the interpolation value specific target map are all equivalent to "1.00", and the map values Z21 to Z25 in the Y2 row are all "0.98". The same applies when the search process is performed and "Y1 ≦ Y ≦ Y2" is specified for the search value Y when the map values of other rows and columns are not the same. If the CPU 5 specifies (X1, Y2) as the designated points in advance, the CPU 5 specifies the map value Z21 as the interpolated value Zb. In this case, the CPU 5 does not perform the linear interpolation calculation process for calculating the interpolation value Za and the interpolation value Zb, so that the time spent on the linear interpolation calculation process can be saved.

Further, as shown in FIG. 13, in the CPU 5, the map values Z11 to Z15, Z21 to Z25, and Z11 to Z51 of the interpolation value specifying target map in the Y1 row, the Y2 row, and the X1 column all have the same value of "1.00". However, when the map values of other rows and columns are not the same, the search process is performed to specify "X1 ≤ X ≤ X2, Y1 ≤ Y ≤ Y2" with respect to the search values (X, Y). When the X1 column, the X2 column, the Y1 row, and the Y2 row are specified as the calculation area, the interpolation value is specified as follows. Since the map values Z11, Z12, Z21, and Z22 used in the linear interpolation calculation process for calculating the interpolation value Z are all the same value, the CPU 5 specifies the map value of the designated point as the interpolation value. If (X1, Y1) is designated as a designated point in advance, the CPU 5 specifies the map value Z11 as the interpolation value Z. In this case, the CPU 5 does not perform the linear interpolation calculation process for calculating the interpolation value Z, so that the time spent on the linear interpolation calculation process can be saved. Note that the CPU 5 may specify points other than (X1, Y1) as the designated points as long as they are points in the Y1 row, Y2 row, and X1 column. For example, (X1, Y5) is designated as the designated point and the map is used. The value Z51 may be specified as the interpolation value Z.

Further, the above has described the case where the map values Z11 to Z15, Z21 to Z25, and Z11 to Z51 of the map for specifying the interpolation value in the Y1 row, Y2 row, and X1 column are all the same value of "1.00". The map values Z11 to Z15, Z21 to Z25, and Z12 to Z52 of the Y1 row, Y2 row, and X2 column of the value identification target map are all the same value of "1.00", but the map values of other rows and columns are the same value. If not, the same applies when the search process is performed and "X1 ≦ X ≦ X2, Y1 ≦ Y ≦ Y2" is specified for the search value (X, Y).

Further, as shown in FIG. 14, in the CPU 5, the map values Z11 to Z15, Z21 to Z25, Z11 to Z51, and Z12 to Z52 of the interpolation value specifying target map in the Y1 row, Y2 row, X1 column, and X2 column are all ". 1.00 ”is the same value, but when the map values of other rows and columns are not the same value,“ X1 ≦ X ≦ X2, Y1 ≦ Y ≦ Y2 ”is specified for the search value (X, Y). When the X1 column, the X2 column, the Y1 row, and the Y2 row are specified as the calculation area, the interpolation value is specified as follows. Also in this case, since the map values Z11, Z12, Z21, and Z22 used in the linear interpolation calculation process for calculating the interpolation value Z are all the same value, the CPU 5 specifies the map value of the designated point as the interpolation value. If (X1, Y1) is designated as a designated point in advance, the CPU 5 specifies the map value Z11 as the interpolation value Z. Also in this case, the CPU 5 does not perform the linear interpolation calculation process for calculating the interpolation value Z, so that the time spent on the linear interpolation calculation process can be saved.

As described above, the CPU 5 executes the equivalence determination process before executing the interpolation value identification process, and performs the interpolation value identification process according to the determination result of the equivalence determination process, thereby performing the search process and the linear interpolation calculation process. The interpolated value is specified without performing the above, or the interpolated value is specified without performing a part or the whole of the linear interpolation calculation process although the search process is performed. That is, if the search process and the linear interpolation calculation process are not performed, the time spent on the search process and the linear interpolation calculation process can be omitted, and the processing time until the interpolation value is specified can be shortened. Further, if the search process is performed but a part or the whole of the linear interpolation calculation process is not performed, the time spent on a part or the whole of the linear interpolation calculation process can be omitted, and the processing time until the interpolation value is specified can be omitted. Can be shortened.

The CPU 5 may perform the interpolation value specifying process according to a parameter that can be set by the user, instead of executing the same value determination process before performing the interpolation value specifying process. That is, the user provides information on whether or not all the map values are the same in all the areas to be interpolated in the map, and whether or not all the map values are the same in some rows or columns in the area to be interpolated in the map. If the information is known, the information is stored in ROM 6 as a parameter, and the parameter is determined in the interpolation value identification process, so that the interpolation value identification process is performed according to the same procedure without performing the equivalence determination process. It is possible to do.

Further, in the above, in the linear interpolation calculation processing, the case where the linear interpolation calculation between the columns of the same row is performed first and the linear interpolation calculation between the rows is performed later has been described. However, the linear interpolation between columns has been described. The order of the operation and the linear interpolation operation between lines may be reversed. That is, in the linear interpolation calculation processing, the linear interpolation calculation between the rows of the same column may be performed first, and the linear interpolation calculation between the columns may be performed later, and X1 to X2, Y1 to be specified as the calculation area. The interpolation value Z may be specified by performing linear interpolation calculation on the map value of Y2 according to the procedure shown in FIG.

That is, the CPU 5 uses (X1, Y1, Z11) and (X1, Y2, Z21) to calculate the interpolation value Zc by the following arithmetic expression.
Zc = ((Z21-Z11) / (Y2-Y1) x (Y-Y1) + Z11)
Next, the CPU 5 uses (X2, Y1, Z12) and (X2, Y2, Z22) to calculate the interpolated value Zd by the following arithmetic expression.
Zd = ((Z22-Z12) / (Y2-Y1) x (Y-Y1) + Z12)
Then, the CPU 5 uses (X1, Y, Zc) and (X2, Y, Zd) to calculate the interpolation value Z by the following arithmetic expression.
Z = ((Zd-Zc) / (X2-X1) x (X-X1) + Zc)

Further, in this case, when the CPU 5 specifies the Xa column, the Xb column, the Ya row, and the Yb row as the calculation area, a predetermined condition is satisfied for the map values of the specified Xa column, the Xb column, the Ya row, and the Yb row. When determining whether or not, the map values of the Ya row, Yb row, Xa column, and Xb column are all the same value, the map values of the Ya row, Xa column, and Xb column are all the same value, and the Yb row. , Xa column, and Xb column may all have the same map value, whichever is a predetermined condition.

As described above, according to the present embodiment, the following effects can be obtained.
In the microcomputer 2 of the electronic control device 1, when it is determined that all the map values are the same in all the regions to be interpolated in the map, the interpolation value is specified without performing the search process and the linear interpolation calculation process. The time spent on the search process and the linear interpolation calculation process can be omitted, and the processing time until the interpolation value is specified can be appropriately shortened. Further, if it is determined that all the map values are the same in some rows or columns specified as the calculation area by the search process in the area to be interpolated in the map, a part or the whole of the linear interpolation calculation process is not executed. Changed to specify the interpolated value. It is possible to omit the time spent on a part or the whole of the linear interpolation calculation processing, and it is possible to appropriately shorten the processing time until the interpolation value is specified. In this case, since it can be realized by improving the program and changing the software, it is not necessary to increase the clock frequency of the CPU 5 or introduce a multi-core system.

In addition, the map value of the designated point specified in advance of the map is specified as the interpolation value. The map value of a desired designated point can be specified as an interpolated value. In addition, the equivalence determination process is performed before the interpolation value identification process is performed, and whether or not all the map values are the same in all the areas to be interpolated in the map and the area to be interpolated in the map are calculated based on the determination result. It is now judged whether or not all the map values are the same in some rows or columns specified as areas. The processing time until the interpolated value is specified can be appropriately shortened without requiring the user to set parameters.

In addition, whether or not the map values are all the same in all the areas to be interpolated by the user according to the parameters that can be set by the user, and the map values in some rows or columns specified as the calculation area in the area to be interpolated in the map. Are all the same value or not. By setting the parameters in advance by the user, the equivalence determination process can be omitted, and the load on the microcomputer 2 can be reduced.

The present disclosure has been described in accordance with the examples, but it is understood that the present disclosure is not limited to the examples and structures. The present disclosure also includes various modifications and modifications within an equal range. In addition, various combinations and forms, as well as other combinations and forms containing only one element, more or less, are also within the scope of the present disclosure.

The application is not limited to the electronic control device that controls the drive of the engine, and may be applied to other electronic control devices that control the vehicle.
The interpolation value is not limited to the whole area of the interpolation value specification target map as the interpolation target area, and the interpolation value may be specified by using a part of the interpolation value specification target map as the interpolation target area.

In the drawings, 1 is an electronic control device, 5 is a CPU (calculation unit), 6a is a map storage unit, 6b is a parameter storage unit, and 7 is a RAM (flag storage unit).

Claims (8)

A map storage unit (6a) that stores a map showing the correspondence between the representative value and the map value, and
As interpolation processing using a map, a search process that searches between representative values corresponding to the search value to specify a calculation area and a map value of the calculation area specified by the search process are linearly interpolated to specify the interpolation value. An arithmetic unit (5) capable of performing linear interpolation arithmetic processing, and
A flag storage unit (7) for storing a flag capable of specifying whether or not all map values are the same in all areas to be interpolated on the map is provided.
The calculation unit is at least linear when the calculation area is a row or column in which the map values are all the same in at least a part of the area to be interpolated in the map and at least all the map values are the same. The interpolation value is specified without performing part or all of the interpolation calculation processing, it is determined whether or not all the map values are the same in all the areas to be interpolated in the map, and the determination result is stored in the flag storage unit. After storing, if it is determined from the determination result stored in the flag storage unit that the map values are all the same in all the areas to be interpolated in the map, interpolation is performed without performing the search process and the linear interpolation calculation process. An electronic control device (1) that specifies a value. A map storage unit (6a) that stores a map showing the correspondence between the representative value and the map value, and
As interpolation processing using a map, a search process that searches between representative values corresponding to the search value to specify a calculation area and a map value of the calculation area specified by the search process are linearly interpolated to specify the interpolation value. An arithmetic unit (5) capable of performing linear interpolation arithmetic processing, and
A parameter storage unit (6b) for storing user-configurable parameters is provided.
The calculation unit is at least linear when the calculation area is a row or column in which map values are all the same in at least a part of the area to be interpolated in the map and at least all the map values are the same. When the interpolation value is specified without performing a part or the whole of the interpolation calculation processing and it is determined that all the map values are the same in all the areas to be interpolated by the parameters stored in the parameter storage unit, the search is performed. processing and linear interpolation processing and to that electronic control device determining an interpolated value without performing (1). The electronic control device according to claim 1 or 2, wherein the calculation unit specifies a map value of a designated point designated in advance as an interpolated value. A map storage unit (6a) that stores a map showing the correspondence between the representative value and the map value, and
As interpolation processing using a map, a search process that searches between representative values corresponding to the search value to specify a calculation area and a map value of the calculation area specified by the search process are linearly interpolated to specify the interpolation value. An arithmetic unit (5) capable of performing linear interpolation arithmetic processing, and
A flag storage unit (7) for storing a flag capable of specifying whether or not all the map values are the same in some rows or columns of the area to be interpolated in the map is provided.
The calculation unit is at least linear when the calculation area is a row or column in which the map values are all the same in at least a part of the area to be interpolated in the map and at least all the map values are the same. The interpolation value is specified without performing part or all of the interpolation calculation processing, and it is determined whether or not all the map values are the same in some rows or columns in the area to be interpolated in the map, and the determination is made. After the results are stored in the flag storage unit, the map values are all the same in some rows or columns specified as the calculation area in the area to be interpolated in the map based on the determination result stored in the flag storage unit. It is with the determined linear interpolation processing that identifies electronic controller interpolated values without performing a part or the whole (1). A map storage unit (6a) that stores a map showing the correspondence between the representative value and the map value, and
As interpolation processing using a map, a search process that searches between representative values corresponding to the search value to specify a calculation area and a map value of the calculation area specified by the search process are linearly interpolated to specify the interpolation value. An arithmetic unit (5) capable of performing linear interpolation arithmetic processing, and
A parameter storage unit (6b) for storing user-configurable parameters is provided.
The calculation unit is at least linear when the calculation area is a row or column in which map values are all the same in at least a part of the area to be interpolated in the map and at least all the map values are the same. The interpolation value is specified without performing part or all of the interpolation calculation processing, and in some rows or columns specified as the calculation area in the area to be interpolated by the parameters stored in the parameter storage unit. the map value is determined that all of the same value, the linear interpolation processing to that electronic control device determining an interpolated value without performing part or all of (1). The electronic control device according to claim 4 or 5, wherein the calculation unit specifies a map value of a designated point designated in advance as an interpolated value. The electronic control device according to any one of claims 1 to 6, wherein the calculation unit specifies an interpolation value with the entire area of the map as an area to be interpolated. A map storage unit (6a) that stores a map showing the correspondence between the representative value and the map value, and
As interpolation processing using a map, a search process that searches between representative values corresponding to the search value to specify a calculation area and a map value of the calculation area specified by the search process are linearly interpolated to specify the interpolation value. A calculation unit (5) capable of performing linear interpolation calculation processing is provided.
The calculation unit is at least linear when the calculation area is a row or column in which the map values are all the same value in at least a part of the interpolation target area of the map and at least all the map values are the same value. The electron according to any one of claims 1 to 7, wherein the interpolation value is specified without performing a part or the whole of the interpolation calculation processing, and the interpolation value is specified by setting a part area of the map as the area to be interpolated. Control device (1) .

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