JPH1027100A - Program data rewriting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need to erase old information at a time and rewrite information in a short time by performing write/read control over control information in a storage area of a nonvolatile storage part and processing read control information. SOLUTION: Program data of specifications corresponding to respective engine kinds of vehicles are previously stored in a flash EEPROM 10 as the nonvolatile storage part and 16 program data for rewriting control which are all logic 1 are stored in other storage areas. Then a rewrite signal generator 2 writes the program data for rewriting control of 16-data constitution having, for example, 1st data set to logic 0 and other data to 1 according to control program specifications in the flash EEPROM 10 through a microprocessor 8 as an information processing part to overwrite them to program data for control to be rewritten. The microprocessor 8 judges program data of corresponding specifications from the data for control to be rewritten, and reads and processes the program data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to the specification of control program data stored in a program memory of a vehicle control unit (ECU) or a vehicle control unit at the time of shipment of a vehicle, that is, the contents of the program data are changed according to the vehicle type or the engine model. The present invention relates to a program data rewriting device for rewriting.

[0002]

2. Description of the Related Art FIG. 1 is a block diagram showing a program data rewriting device in a vehicle control device according to the prior art and the present invention.
In the figure, reference numeral 1 denotes a vehicle control device, which controls a vehicle operation by using a microprocessor in accordance with vehicle control program data stored in advance. 2
Denotes a control program data rewrite signal generator (hereinafter, referred to as a rewrite signal generator) that issues a signal necessary for rewriting the control program data stored in the vehicle control device 1.

The vehicle control device 1 performs a control operation in accordance with information necessary for vehicle control input from an input I / F 6 and control program data stored in an internal memory, and outputs a control signal to a control target through an output I / F 7. , A RAM 9 for storing information necessary for vehicle control input through the input I / F 6, and 10 a flash EEPROM for writing control program data in an updatable manner to correspond to the type of vehicle on which the vehicle control device 1 is mounted. is there. The flash EEPROM 10 is a storage element capable of electrically writing data, retaining its stored contents even when the power is turned off, and erasing data in a predetermined range electrically and collectively.

[0004] Reference numeral 11 denotes a microprocessor 8 for rewriting control program data in the flash EEPROM 10.
Is a ROM in which rewrite control program data necessary for performing the program are stored. In a signal line provided between the rewrite signal generator 2 and the vehicle control device 1, 3 is a communication line for transferring control program data, and 4 is a flash EEPROM.
A voltage supply line 5 for supplying a rewrite voltage to the OM 10 is a signal line for supplying a rewrite timing signal to the flash EEPROM 10.

The microprocessor 8 inputs information necessary for controlling the vehicle to a RAM 9 through an input I / F 6.
At the same time, the control program data written in the flash EEPROM 10 is read out, a control amount is calculated from information in the RAM 9 according to the control program data, and a control signal corresponding to the control amount is output to the control target through the output I / F 7. To control the operation of the vehicle.

Next, the rewriting operation of control program data of the conventional vehicle control device shown in FIG. 1 will be described with reference to FIGS. FIG. 5 is a data configuration diagram of control program data transferred to the microprocessor 8 when the control program data is rewritten. FIG. 6 is a flowchart for explaining the operation at the time of rewriting the control program data. A process of rewriting the control program data stored in the flash EEPROM 10 according to the procedure of this flowchart will be described.

First, a rewriting procedure is started in step S101. In step S102, the rewrite signal generator 2 applies a rewrite voltage to the microprocessor 8 via the voltage supply line 4 to rewrite the control program data stored in the flash EEPROM 10. In order to rewrite the contents of the flash EEPROM 10, a constant voltage needs to be applied.

Next, in step S103, the rewrite signal generator 2 transmits a rewrite timing signal for accessing the ROM 11 containing the rewrite control program to the microprocessor 8 through the signal supply line 5. Upon detecting the rewrite timing signal, the microprocessor 8 stops the normal control, reads the contents of the ROM 11 containing the rewrite control program, and starts rewriting the control program data of the flash EEPROM 10 according to the rewrite control procedure.

After activating the rewrite control program, the process proceeds to step S104, in which a series of initialization procedures are performed between the rewrite signal generator 2 and the microprocessor 8. This series of initialization procedures is made unique for each microprocessor 8 so as to prevent illegal writing.

When the rewrite signal generator 2 detects that the initialization has been normally completed in step S105, it determines that the program is ready for rewriting, and proceeds to step S106, where the rewrite signal generator 2 writes the program to the flash EEPROM 10 to update the control program data. An instruction is sent to the microprocessor 8 to perform a batch erasure of the stored data. If the initialization has not been performed normally, the process proceeds to step S114,
The processing is terminated and the initialization processing is started again in the next operation cycle.

In step S107, the rewrite signal generator 2 waits for a signal from the microprocessor 8 as to whether or not the batch erasure has been completed. If it is confirmed that the batch erasure process has been completed, the flow advances to step S108 to transfer the rewrite control program data held in the rewrite signal generator 2 to the microprocessor 8 through the communication line 3 according to a predetermined format. I do. The format of the data to be transferred is shown in FIG.
According to this data format, 16 control program data can be sent in one transfer process.

Therefore, the rewrite signal generator 2 performs a total of 8,192 data transfers to send all the control program data. The microprocessor 8 determines in step S109
The control program data is received in accordance with the transfer data, and written in a predetermined position of the flash EEPROM 10 according to the position information in which the control program data is described.

When one write operation is completed, the microprocessor 8 sends a write end signal to the rewrite signal generator 2 using the communication line 3 in step S110. When the rewrite signal generator 2 receives the write end signal, the process proceeds to step S1.
Then, the process proceeds to step 11 to check whether or not all data transfer is completed. If not, the process returns to step S108 to perform the next data transfer.

If the data transfer has been performed 8192 times, the rewrite signal generator 2 determines that the transfer of all the control program data has been completed, and proceeds to step S112 to check the control program data of the rewritten flash EEPROM 10. A signal is sent to the microprocessor 8 to do so.

There are various methods for performing the check. Generally, the microprocessor 8 sends the result of addition of all data to the rewrite signal generator 2. In step S113, the rewrite signal generator 2 compares the addition result with a value calculated in advance,
If the addition result matches the calculated value, it is determined that the control program data has been correctly written, and the process proceeds to step S114 to end the process. If not correct, step S105
And the flash EEPROM 10 is rewritten again.

[0016]

Since the conventional vehicle control device and the program data rewrite signal generator are configured as described above, there are the following problems. To rewrite one control program data, 819
Since it is necessary to perform two data transfers, about 115 seconds are required for the data transfer. Considering the initialization procedure of the flash EEPROM and the time of batch erasing of data in addition to the data transfer time, one ECU
There is a problem that it takes a considerable time to rewrite the control program data in terms of productivity efficiency.

Further, since the rewrite signal generator holds control program data for each program specification, it is necessary to secure a storage medium having a memory capacity in consideration of the amount of program data for holding the control program data. Further, the rewrite signal generator normally holds a plurality of vehicle control program data at the time of shipping the vehicle, and requires a large-capacity storage medium to select and rewrite the control program data according to the engine specification. There was a problem of doing.

Further, since the rewriting signal generator holds all control program data corresponding to each vehicle, if the rewriting signal generator is taken out of a place where the program data is rewritten at the time of shipment, the control program data is stored. There is a problem that data may be read out illegally and used, and an extra burden of management is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem. To shorten the data rewriting time of a flash EEPROM, a part of the memory data is not erased at the time of data rewriting. An object of the present invention is to provide a program data rewriting device capable of changing a control program data specification according to a corresponding vehicle to be controlled by overwriting with rewriting data.

[0020]

According to a first aspect of the present invention, there is provided a program data rewriting device for storing and holding control information of a vehicle and outputting the control information to the outside through a communication line. An electrically writable / collectively erasable non-volatile storage unit for reading control information output from the means and directly overwriting initial information in a preset storage area, and controlling the storage area in the non-volatile storage unit And a vehicle control means including an information processing unit for performing information write / read control and processing the read control information.

According to a second aspect of the present invention, in the program data rewriting device, the nonvolatile storage unit stores a plurality of control program data corresponding to the specifications of each vehicle in a predetermined storage area, and the control program data according to the specifications of the vehicle. A storage area for overwriting initial information with selection information for selecting the selected control program data, and the control information output means outputs selection information corresponding to the specification of the vehicle to an information processing unit of the vehicle control means and stores the selected information. When the initial information of the area is overwritten with the selection information and replaced, the information processing section reads and processes the corresponding control program data from the replaced selection information.

According to a third aspect of the present invention, in the program data rewriting device, the nonvolatile storage unit stores information of each data position in the initial information write area in which the selection information is overwritten.
The information of the predetermined data position is overwritten by 0 according to the content of the input selection information and replaced.

According to a fourth aspect of the present invention, in the program data rewriting device, the nonvolatile storage unit sets information of each data position of an initial information writing area for overwriting selection information to 1,
The information of each data position is overwritten and replaced with a combination of 1 and 0 according to the content of the input selection information.

According to a fifth aspect of the present invention, in the program data rewriting device, the nonvolatile storage unit sets information of each data position in the initial information writing area in which the control program data is overwritten to 1, and controls the information of each data position. The control program data output from the information output means is overwritten and replaced.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The configuration of the program data rewriting device of the vehicle control device according to the present embodiment is the same as the configuration data of the program data rewriting device of the vehicle control device according to the prior art, and therefore detailed description thereof is omitted.

The rewriting operation of the program of the vehicle control device shown in FIG. 1 will be described with reference to FIGS. 2, 3 and 4. FIG. 2 is a configuration diagram of transfer data at the time of rewriting control program data, FIG. 3 is a flowchart illustrating control program data rewriting processing, and FIG. 4 is a process of selecting control program data whose specifications have been updated based on rewriting control program data. It is a flowchart explaining.

First, before describing the operation of the present embodiment, an outline of the present embodiment will be described. When loading the control program data of the specification corresponding to the engine model of the vehicle into the flash EEPROM 10, the conventional device erases the entire contents of the flash EEPROM 10 and then sends the control program data of the specification corresponding to the engine model from the rewrite signal generator 2. The data was transferred 8000 times to the microprocessor 8 to complete the loading.

However, in the present embodiment, the program data of the specification corresponding to each engine model of the vehicle is stored in advance in the flash EEPROM 10 as the nonvolatile storage unit, and the rewrite control for all the logic 1 is stored in the other storage area. 16 program data are stored. The rewrite signal generator 2 as control information output means processes rewrite control program data of 16 data configurations in which, for example, the first data is set to logic 0 and the other data is set to 1 according to the control program specification. The data is written into the flash EEPROM 10 through the microprocessor 8 as a unit, and overwrites the rewrite control program data. The microprocessor 8 determines the program data of the corresponding specification from the overwritten rewrite control program data, reads the program data from the flash EEPROM 10, and processes the read program data.

First, a rewriting procedure is started in step S201. In step S202, the rewrite signal generator 2 applies a rewrite voltage to the microprocessor 8 to rewrite the flash EEPROM 10. The flash EEPROM 10 needs to apply a constant voltage to rewrite data.

The rewriting voltage is supplied from the rewriting signal generator 2 through the voltage supply line 4. Next, step S
At 203, the rewrite signal generator 2 has a ROM for storing a program for rewrite control (see the flowchart of FIG. 3).
A rewriting timing signal is transmitted to the microprocessor 8 through the signal supply line 5 in order to activate the contents of 11.

Upon detecting the rewrite timing signal, the microprocessor 8 stops the normal control, reads out the contents of the ROM 11 containing the rewrite control program, and follows the flash EEPROM 10 according to the control procedure.
Rewriting of the control program data is started.

After activating the rewrite control program, the process proceeds to step S204, in which a series of initialization procedures are performed between the rewrite signal generator 2 and the microprocessor 8. This procedure is intended to prevent illegal writing by making it unique for each microprocessor 8.

When the rewrite signal generator 2 detects that the initialization has been normally completed in step S205, it determines that the program is ready for rewriting, and proceeds to step S206. If the initialization was not performed normally, step S2
Proceed to 11 to end the processing.

In step S206, the rewrite signal generator 2 sends a signal to the microprocessor 8 to check the rewrite control program data in the flash EEPROM 10. This is because a program inappropriate for rewriting may be loaded in the flash EEPROM 10. Although there are various methods for performing the check, in this embodiment, the result of the addition of all data by the microprocessor 8 is sent to the rewrite signal generator 2.

In step S207, the rewrite signal generator 2
The addition result is compared with a value calculated in advance by the checksum. If the addition value matches, the control program data to be rewritten is determined as step S208.
Proceed to. If not correct, the process proceeds to step S211 and ends.

In step S208, the rewrite signal generator 2 transfers the stored rewrite control program data to the microprocessor 8 according to a predetermined format. FIG. 2 shows the configuration of the data to be transferred.

In the structure of the data to be transferred, the rewriting control program data used when selecting the control program data of the specification A is position information 0000 (first program data) of the 16 program data. Is 00, and the program data values of all other position information are FF.

The rewrite control program data used when selecting the control program data of the specification B includes position information 0001 (second
The program data value of the (third program data) is 0
0, the program data value of all other position information is FF.

The rewrite control program data used when selecting the control program of the specification C is program data of position information 0002 (third program data) of 00 out of 16 pieces of program data. The program data values of all the position information are FF. With this program data configuration, one data transfer
Six control program data can be sent.

In step S209, when the microprocessor 8 receives the rewrite control program data for selecting, for example, the control program specifications shown in FIG. 2, the rewrite control program data is adjusted to the data transfer cycle, and the described position information is written. Flash EEPROM10 based on
Is written in a predetermined position.

The write position of the rewrite control program data in the flash EEPROM 10 has position information 000.
All program data values in 0 to 0015 are FF
The rewrite control program data of (= 1) has been written. When the writing is completed, the microprocessor 8 sends a write end signal to the rewriting signal generator 2 through the communication line 3 shown in FIG. When the rewrite signal generator 2 receives the write end signal, the process proceeds to step S21.
The process proceeds to 1 and ends.

As described above, in the present embodiment, the position information 0000,
A value FF different from 00 for all program data values in 0001 and 0002 is set in advance. In this state, the position information 0000, 0001, 0002 of the rewrite control program data on the flash EEPROM 10 is stored.
Becomes FF, and the rewrite control program data is not rewritten even if it is overwritten.

Accordingly, the microprocessor 8 recognizes that the program data in the position information 0000, 0001, 0002 has not been rewritten, and proceeds to the next processing without selecting any of the control program data of the specifications A, B and C. . The value of the data on the flash EEPROM 10 is represented by either 0 or FF (1). Flash EEP
The ROM 10 does not overwrite the data of 0 with 1 but can overwrite the data of 1 with 0.

Utilizing this property, the flash EEPROM 10 of the specification to be selected can store the position information 0000, 000.
If the position information part reaching the 1,0002 part and the position information 15 is set to data different from 0, that is, 1, the position information 00
000F can be overwritten with 0 by the rewrite control program data sent from the rewrite signal generator 2 later.

Therefore, when it becomes necessary to select the program data specification A, the rewrite control program data in the position information 0000 may be changed to 00, and the rewrite signal generator 3 is provided as shown in FIG. The rewrite control program data for selecting the specification A is sent to the microprocessor 8 to overwrite the rewrite control program data on the flash EEPROM 10. Similarly, when the specification B data is selected, the rewrite control program data in (2) of FIG. 2 is overwritten on the rewrite control program data on the flash EEPROM 10. Similarly, when the specification C data is selected, the rewrite control program data in (3) of FIG. 2 is overwritten on the rewrite control program data on the flash EEPROM 10.

When the rewriting control program data has been overwritten in the flash EEPROM 10, the microprocessor 8 selects control programs of specifications A to C from the flash EEPROM 10 according to the rewriting control program data as shown in the flowchart of FIG. And execute the processing.

The control program data of three different specifications A, B, and C are the position information 0000 of the rewrite control program data overwritten in the flash EEPROM 10,
It is stored in the flash EEPROM 10 so that it can be arbitrarily selected according to the value of the data 0001 or 0002.

The operation starts from step S301. In step S302, the microprocessor 8 reads the data of the position information 0000 of the rewrite control program data, and determines whether or not the data value is 00. If the data value is 00, the process advances to step S303 to select control program data of specification A and execute the processing. When the processing is completed, the process proceeds to step S308 to perform the next processing.
If the data value is not 00 in step S302, the process proceeds to step S304.

In step S304, the microprocessor 8 similarly reads the data of the position information 0001, and determines whether or not the data value is 00. Data value is 00
If so, the process advances to step S305 to select the control program data of the specification B and execute the process. When the processing is completed, the process proceeds to step S308 to perform the next processing.

If the data value is not 00 in step S304, the process proceeds to step S306. In step S306, the microprocessor 8 similarly reads the data of the position information 0002 and determines whether or not the data value is 00. If the data value is 00, the process proceeds to step S307,
The control program data of the specification C is selected and the processing is executed. When the processing is completed, the process proceeds to step S308 to perform the next processing. If the data value is not 00 in step S306, the process proceeds to step S308 to perform the next process.

By constructing the rewrite control program data as described above, the rewrite signal generator 2 incorporates control program data of a plurality of types of specifications as one type of control program data. It is possible to switch to the selected data of the control program data having completely different specifications only by switching the small number of data in the middle.

In this embodiment, the rewritable control program data having the structure shown in FIG.
Since the data is written in the ROM 10, it is possible to obtain control program data having desired specifications only by transferring the rewrite control program data once.

In this embodiment, the vehicle control program data of three specifications can be selected. However, it is needless to say that the number of selections can be arbitrarily set by increasing the number of position information to 0002 or more.

Embodiment 2 In the first embodiment, the switching of the specification of the control program data is determined by the data value written in the unique position information.
Data values written in a plurality of pieces of position information can be shared for determination. In other words, by combining 1 and 0 and data values written in the preset n pieces of position information and generating 2 ⁿ pieces of selection information, control program data of 2 ⁿ specifications can be selected. .

Embodiment 3 In the first embodiment, the parameters for selecting the control program data of each specification are written in the flash EEPROM according to the rewrite control program data.
The control program data of any specification can be selected by writing on M10. But Flash EEPR
By setting all the predetermined storage areas of the OM 10 to 1 data, these data can be overwritten by the control program data transmitted from the write signal generator 2. As a result, control program data having desired specifications can be loaded into the flash EEPROM 10 in a short time.

Embodiment 4 In addition, the first to third embodiments are described.
In the above, the case where the control program data of the specification corresponding to the model of the engine is overwritten and loaded into the flash EEPROM 10 has been described. However, the overwriting is not limited to the control program data.

In an anti-theft device that determines the authenticity of an engine key having a unique code registered in advance and permits starting of a vehicle, the unique code is rewritten when the engine key is determined. 2 to the vehicle control device 1 and the flash EE
A registration operation is performed by overwriting a specific area of the PROM 10.

When the unique code is registered, the code read from the engine key by a predetermined code reading means is transmitted to the vehicle control device 1 every time the engine is started.
Therefore, the code is checked for coincidence with the code registered in the flash EEPROM 10 to determine whether the engine can be started.

[0059]

According to the first aspect of the present invention, control information output means for storing and holding vehicle control information and outputting the control information to the outside through a communication line, and control output from the control information output means. An electrically writable / collectively erasable nonvolatile storage unit for reading information and directly overwriting initial information in a preset storage area, and controlling writing / reading of the control information to / from the storage area of the nonvolatile storage unit And the vehicle control means provided with an information processing section for processing the read control information, there is an effect that information can be rewritten in a short time without the necessity of batch erasing of old information.

According to the second aspect of the present invention, the nonvolatile storage unit stores a plurality of control program data corresponding to the specifications of each vehicle in the predetermined storage area, and the control program data corresponding to the specifications of the vehicle from the control program data. The control information output means outputs selection information corresponding to the specification of the vehicle to the information processing section of the vehicle control means, and sets a storage area for overwriting the selection information for selecting the initial information with the initial information. Is overwritten with the selection information and replaced, the information processing unit reads and processes the corresponding control program data from the replaced selection information, so that the control program data is overwritten only by overwriting the selection information in the nonvolatile storage unit. There is an effect that loading can be performed in a short time.

According to the third aspect of the present invention, the nonvolatile storage unit sets the information of each data position in the initial information writing area in which the selection information is overwritten to 1, and receives the information of the predetermined data position in the selection information. By overwriting and replacing with 0 according to the contents of the above, there is an effect that setting of selection information can be easily performed.

According to the fourth aspect of the present invention, the nonvolatile storage unit sets the information of each data position of the initial information writing area in which the selection information is overwritten to 1 and the information of each data position is inputted to the selection information. By overwriting and replacing with a combination of 1 and 0 according to the contents of the above, there is an effect that a parameter for selecting a large number of control program data can be generated with a small selection information of data.

According to the fifth aspect of the present invention, the nonvolatile storage unit sets the information of each data position in the initial information writing area in which the control program data is overwritten to 1, and outputs the information of each data position from the control information output means. By overwriting and replacing with the output control program data, there is an effect that the control program data can be easily written in a short time and easily without selection information.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a vehicle control device of the related art and the present invention.

FIG. 2 is a data configuration diagram illustrating transfer data for rewriting control program data of the vehicle control device according to the embodiment of the present invention.

FIG. 3 is a flowchart for explaining a rewriting operation of control program data of the vehicle control device according to the embodiment of the present invention.

FIG. 4 is a flowchart illustrating a control program data structure of the vehicle control device according to the embodiment of the present invention.

FIG. 5 is a data configuration diagram illustrating transfer data for rewriting control program data of a conventional vehicle control device.

FIG. 6 is a flowchart for explaining a rewriting operation of control program data of a conventional vehicle control device.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 vehicle control device, 2 control program data rewrite signal generator, 3 control program data transfer communication line, 4 rewrite power supply line, 5 rewrite timing signal supply line, 8 microprocessor, 10
Flash EEPROM.

Claims (5)

[Claims] 1. Control information output means for storing and holding control information of a vehicle and outputting the control information to the outside through a communication line, reading control information output from the control information output means, and storing the control information in advance. Writable / batch-erasable non-volatile storage unit that directly overwrites the initial information in the area
And a vehicle control unit including: an information processing unit that performs write / read control of the control information in the storage area of the nonvolatile storage unit and processes the read control information. apparatus. 2. A non-volatile storage unit stores, in a predetermined storage area, a plurality of control program data corresponding to the specifications of each vehicle and selection information for selecting control program data corresponding to the specifications of the vehicle from the control program data. A storage area to be overwritten with information is set, and control information output means outputs selection information corresponding to the specification of the vehicle to an information processing section of the vehicle control means, and overwrites initial information of the storage area with the selection information. 2. The program data rewriting apparatus according to claim 1, wherein the information processing section reads and processes the corresponding control program data from the replaced selection information. 3. The non-volatile storage unit sets information of each data position in an initial information write area in which selection information is overwritten to 1, and sets information of a predetermined data position to 0 according to the content of the input selection information. 3. The program data rewriting device according to claim 2, wherein the program data is rewritten by overwriting. 4. The non-volatile storage unit sets information of each data position of an initial information writing area in which selection information is overwritten to 1, and sets information of each data position to 1 according to the content of the input selection information. 3. The program data rewriting device according to claim 2, wherein the replacement is performed by overwriting with a combination of zero. 5. The nonvolatile storage unit sets information of each data position in an initial information writing area in which control program data is overwritten to 1, and stores the information of each data position with control program data output from control information output means. 2. The program data rewriting device according to claim 1, wherein the program data is replaced by overwriting.