JP5120010B2 - Method of writing control data to on-vehicle control device and on-vehicle control device - Google Patents

Description

  The present invention relates to an on-board control device that controls the operation of an on-board automatic device, and a method of writing a control program and / or reference data used in execution of the program to the on-board control device. The present invention is not intended to be limited to this, but can be used for a shift control device that controls the operation of an automatic transmission on a vehicle and other computers and controllers that control the operation of an on-vehicle automatic device.

JP 2003-202072 A JP 2006-238332 A JP 2001-034601 A

  Patent Document 1 describes a vehicle control device that calculates a target speed based on road information and a traveling state, and controls a shift of an on-vehicle automatic transmission by a computer so that the vehicle speed is the target speed. ing. Patent Document 2 describes a vehicle control apparatus that controls an automatic transmission based on a shift lever position and an engine operating state using a CPU and an EEPROM with built-in RAM.

  Patent Document 3 describes a method of writing a control program in a nonvolatile memory of a one-chip microcomputer (microcomputer) employed in many on-vehicle control devices. The microcomputer mainly includes a CPU, RAM, and nonvolatile memory (EPROM, EEPROM), and the storage capacity of the RAM is smaller than that of the nonvolatile memory. In the first embodiment shown in FIG. 1 of Patent Document 3, the control program is compressed and transferred in order to shorten the transfer time of the control program stored in the microcomputer (nonvolatile memory) from the external PROM writer. The control program is blocked in units that can fit in the free area of the RAM, and is compressed and transferred in units of blocks. However, since writing is performed while transferring, high compression is not suitable and the compression rate is low, and when compressed data is decompressed or expanded, it is compressed and transferred in units that can fit in the free area of RAM, so one block compression The amount of data, that is, the amount of transfer data is small, and the transfer time saving effect is relatively low. Therefore, in the second embodiment, when compressed data in block units of the control program is received and sequentially written in the RAM and then written in the nonvolatile memory, and the compressed data of all the control programs is stored in the nonvolatile memory, the compressed data is read from the nonvolatile memory. Are sequentially read into the RAM and decompressed, and the decompressed data is written into the nonvolatile memory. According to this, since the transfer time of the control program from the PROM writer to the one-chip microcomputer as the control device is short and the compression method with a high compression rate can be adopted, the transfer time can be further shortened.

  However, since it is necessary to hold the compressed data and decompressed data of the control program in the nonvolatile memory in parallel, the storage capacity of the nonvolatile memory must be increased by the amount of holding the compressed data. Also, when writing the control program, the same compressed data is written twice in the RAM, and the compressed data must be written to and read from the nonvolatile memory. Will increase.

  By the way, the writing of the control program and the reference data used in the control program is different in the case of transferring non-compressed data and the case of transferring compressed data, and the data transfer frame generated by a PROM writer or other transfer tool is different. Also, storage processing of received data in a non-volatile memory by an on-board control device such as a one-chip microcomputer is different. However, there are cases where it is desired to transfer all the data as uncompressed data, or there are cases where it is desired to transfer the compressed data and uncompressed data together. In particular, since the reference data used in the control program is frequently changed for the sake of design, there are cases where it is desired to process the reference data with uncompressed data. In addition, there is a case where uncompressed data that can be recognized as text data is used when a specific identification product number is written.

  The first object of the present invention is to enable transfer of data in which compressed data and non-compressed data are mixed in the control program, control reference data write, additional write or partial update write to the on-board controller. The second object is to realize this without significantly increasing the storage capacities of the RAM and the nonvolatile memory, and the third object is to realize the data read / write processing of the RAM and the nonvolatile memory without significantly increasing. .

In order to achieve the above object, the present invention provides a first program for transferring uncompressed control data including a program for controlling the operation of the on-board automatic device (1) and reference data used in the execution of the program. It is assumed that the seed data transfer frame and the second kind data transfer frame to be compressed and transferred have the same fixed size, and each data transfer frame includes compression identification information indicating non-compression / compression. In the on-vehicle control device, when the compression identification information of the received data frame indicates non-compression, the control data of the data transfer frame is stored in the nonvolatile memory (27). the control data transfer frame starts decompression processing is written to the RAM (26), interrupted amount write and the control amount of data in the RAM of the control data decompressed set, reaches a decompression process The decompressed control data is stored in the nonvolatile memory (27), and the decompression process is resumed from where it was interrupted. This decompression and storage in the nonvolatile memory are all decompressed for the data transfer frame compression control data. The process is repeated until the data is stored in the nonvolatile memory. The method for writing control data to the on-vehicle control device of the present invention for realizing this is as follows (1).

(1) To store a RAM (26) for temporarily writing data, and a control data including a program for controlling the operation of the on-board automatic device (1) and reference data used in the execution of the program. A non-volatile memory (27), and using the control data of the non-volatile memory, the state data representing the state of the on-board automatic device is held in the RAM, and output data is generated based on the state data. In the control data writing method for storing the control data in the nonvolatile memory of the on-vehicle control device (22) for controlling the operation of the on-board automatic device by:
Non-compressed control data to be stored in the non-volatile memory (27), and address data for specifying a storage address of the control data on the non-volatile memory , including a fixed size including compression identification information representing non-compression The first type data transfer frame, or the compressed control data for storing in the nonvolatile memory (27) and the address data representing the outside of the address range of the nonvolatile memory, and compression identification information representing compression Including a second type data transfer frame having the same size as the fixed size,
When the compression identification information of the received data transfer frame represents non-compression, the control data of the data transfer frame is stored in the nonvolatile memory (27),
When the compression identification information of the received data transfer frame indicates compression, the control data of the data transfer frame is written into the RAM (26) and the decompression process is started, and the decompressed control data is written into the RAM. and said control data amount set amount reaches the interrupted decompression processing, and stores the control data and thawed the non-volatile memory (27), and resumes decompression processing from the interrupted position, and the thawing The storage in the nonvolatile memory is repeated until all the compression control data of the data transfer frame is decompressed and stored in the nonvolatile memory.
A method of writing control data to the on-vehicle control device.

  In addition, in order to make an understanding easy, the code | symbol of the corresponding element or the corresponding matter of the Example which is shown in drawing and mentions later in a parenthesis was added as an example for reference. The same applies to the following.

According to this, since the first type data transfer frame for non-compressed transfer and the second type data transfer frame for compressed transfer are the same fixed size, the vehicle has the same frame configuration. Can be transferred to the upper control device. The amount of control data uncompressed first type data transfer frame, by fixing the set amount capable RAM write, without increasing the storage capacity of the RAM, transfer and first type data transfer frame it is possible to store in the nonvolatile memory of the control data therein.

Since the two data transfer frame is the same size as the first type data transfer frame, the data amount of the compressed control data of the second type data transfer frame since the above set amount, it is possible to RAM write. Since there is compression identification information in the data transfer frame, the necessity of decompression processing can be easily selected based on this. And the compressed data set amount in RAM, if there is free space for storing control data decompressed set amount, the writing and the control amount of data in the RAM of the control data decompression set amount, to reach thawing The processing is interrupted, the decompressed control data is stored in the nonvolatile memory (27), and the decompression process is resumed from the interrupted location, and the decompression and storage in the nonvolatile memory are controlled by compressing the data transfer frame. Since all the data is decompressed and stored in the non-volatile memory, no RAM overflow occurs. If this free space is not guaranteed, the set amount is set to ½ or less of the free space of the RAM. In this way, without increasing exceptionally the storage capacity of RAM, storage of the transfer and non-volatile memory of the non-compressed control data using a first type data transfer frame, of course, control compressed using the second type data transfer frame Data can be transferred and stored in non-volatile memory. The data read / write processing of the RAM and the nonvolatile memory is not particularly increased.

In the later-described embodiment of the present invention, the address data of the nonvolatile memory is 3 bytes, and the most significant 2 bits (first bit) of the most significant byte (first byte) represents “compression”. "Represents uncompressed. In this case, the maximum address of the storage area of the nonvolatile memory is such that the bit remains at “00”. Since the transfer destination address data at the head part (protocol) of the data transfer frame is also used as the compression identification information, the first type data transfer frame and the second type data transfer frame are apparently identical in configuration, and this is also uncompressed control. Data transfer and compression control data transfer are easily used together.

  (2) The control to the on-vehicle control device according to (1), wherein the uncompressed control data amount of the first type data transfer frame is a fixed value, and the set amount is the fixed value. Data writing method.

( 3 ) The second type data transfer frame indicates storage data obtained by dividing the control data to be stored in the nonvolatile memory (27) into a plurality (n) and whether the storage data is compressed data. Each data transfer frame including compression identification information. When the storage data of one data transfer frame is compressed data and the decompressed control data is stored in the nonvolatile memory (27), the decompression process is interrupted. When the next data transfer frame is received, if the compression identification information of the data transfer frame indicates compression, the storage location of the data transfer frame is written in the RAM (26), and The method for writing control data to the on-vehicle control device according to (1) or (2) above, wherein the decompression process is restarted.

According to this, be compressed more than the set amount, in the control data size is large, storing and transfer to the vehicle the control device divided and the divided compressed data in setting the amount of the data transfer frame Can do.

( 4 ) To store the RAM (26) for temporarily writing data, and the control data including the program for controlling the operation of the on-board automatic device (1) and the reference data used in the execution of the program A non-volatile memory (27), and using the control data of the non-volatile memory, the state data representing the state of the on-board automatic device is held in the RAM, and output data is generated based on the state data. In the on-vehicle control device (22) for controlling the operation of the on-vehicle automatic device by
The control data to be stored in the non-volatile memory (27) and the address data designating the storage address of the control data on the non-volatile memory, which represents non-compression are the address data itself and the compression to represent, the non compressed identification information is representative of the outside of the address range of the memory, including the control data receives the same data transfer frame of fixed size regardless of whether the compressed or non-compressed,
If the compression identification information does not represent compression, the control data of the data transfer frame is stored in the nonvolatile memory (27),
When the compression identification information represents compression, the control data of the data transfer frame is written into the RAM (26) to start the decompression process, and the decompressed control data is written into the RAM. the control data volume set amount reaches the interrupted decompression processing, and stores the control data and thawed the non-volatile memory (27), and resumes decompression processing from the interrupted position, the decompression and non The on-vehicle control device characterized in that the storage in the memory is repeated until all the compression control data of the data transfer frame is decompressed and stored in the nonvolatile memory.

According to this, since the data transfer frame is the same size regardless of whether those for compressed control data transfer or not for uncompressed control data transfer, control data in the RAM is received by the same receiving function Can be written. Since there is compression identification information in the data transfer frame, the necessity of decompression processing can be easily selected based on this. And the compressed data set amount in RAM, if there is free space for storing control data decompressed set amount, the writing and the control amount of data in the RAM of the control data decompression set amount, to reach thawing The processing is interrupted, the decompressed control data is stored in the nonvolatile memory (27), and the decompression process is resumed from the interrupted location, and the decompression and storage in the nonvolatile memory are controlled by compressing the data transfer frame. Since all the data is decompressed and stored in the non-volatile memory, no RAM overflow occurs. If this free space is not guaranteed, the set amount is set to ½ or less of the free space of the RAM. In this way, without increasing exceptionally the storage capacity of RAM, storage of the transfer and non-volatile memory of the non-compressed control data using a first type data transfer frame, of course, control compressed using the second type data transfer frame Data can be transferred and stored in non-volatile memory. The data read / write processing of the RAM and the nonvolatile memory is not particularly increased.

( 5 ) The control to the on-vehicle control device according to ( 4 ), wherein the uncompressed control data amount of the first type data transfer frame is a fixed value, and the set amount is the fixed value. Data writing method.

(6) the data transfer frame for transferring the compressed data of the control data, the nonvolatile memory (27) said control for storing data and said storage divided into a plurality of compressed data of the data to be stored in Each data transfer frame including compression identification information indicating whether or not the data is compressed data. The storage data of one data transfer frame is compressed data, and the decompressed control data is stored in the nonvolatile memory (27 When the next data transfer frame is received, if the compression identification information of the data transfer frame indicates compression, the storage data of the data transfer frame is stored in the RAM ( The on-vehicle control device according to ( 4) or (6 ), wherein the decompression process is restarted from the point where the writing was interrupted in 26).

  Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

  FIG. 1 shows an outline of a shift control system equipped with an on-vehicle control device according to an embodiment of the present invention. The automatic transmission 1 includes a speed change mechanism, a hydraulic circuit that drives the speed change mechanism, and a solenoid valve group that controls the flow of hydraulic pressure in the hydraulic circuit. The speed change mechanism changes the rotational power of the engine 3 to the rotational power for driving the wheel drive shaft and changes the direction, and includes a torque converter, and a planetary gear mechanism and a clutch for performing a multi-stage speed change. Including brakes. The hydraulic circuit includes an oil pump, many mechanical valves, an orifice, and a fluid flow path. When each solenoid valve of the solenoid valve group inserted in the fluid flow path is turned on (opened) / off (closed) or switched to hydraulic pressure, the hydraulic circuit turns on (applies) / offs hydraulic pressure to the clutch and brake of the transmission mechanism. (release. As a result, the range (parking P, reverse R, neutral N, forward D, S, L) of the automatic transmission 1 is determined, and forward and reverse speed stages (first speed to sixth speed) are determined. Among the solenoid valve group, there are a solenoid valve for forward setting, a solenoid valve for reverse setting, and a solenoid valve for setting the speed stage and lockup.

  The electronic control unit (ECU) 2 receives a state signal such as a brake signal, a throttle opening signal, an engine speed signal, a vehicle speed signal, and other state signals to be referred to for determining the range and speed stage. A range instruction signal representing a key operated by the driver of the range selection key group (electric switch group) 4 is given. In response to the status signal and the range instruction signal, the ECU 2 determines a range to be set and a speed stage, and sets a solenoid valve group for setting the automatic transmission 1 to the determined range and speed stage. A solenoid operation signal for instructing on / off (non-energization) of each solenoid valve is generated and output to a solenoid driver (energization circuit) that energizes each solenoid built in the automatic transmission 1. This energizes each solenoid valve or stops energization.

  The ECU 2 receives from the engine 3 and the automatic transmission 1 a state signal indicating the operation state of the engine and the operation state of the automatic transmission, and also receives a range selection signal from the range selection key group 4 and receives the hydraulic pressure of the automatic transmission 1. Input / output interface (I / F) 21 for outputting instruction signals (operation signals) such as ON / OFF of various solenoid valves of the circuit and hydraulic pressure switching to the automatic transmission 1, and the on-board system which is the main controller of the on-board computer system An input / output interface (I / F) 23 for receiving a state signal indicating a driving state and a traveling state of the vehicle from the controller VSCC and outputting a transmission state signal indicating an operation state of the automatic transmission 1 to the on-board system controller VSCC; And, using the shift control program, operation output data is generated corresponding to the input state signal and output to the I / F 21 That a train control device according to one embodiment of the present invention, and a transmission controller 22.

  The operation output data is decoded into a transmission operation signal in the I / F 21 and output to the solenoid driver of the automatic transmission 1. In this embodiment, a one-chip microcomputer (microcomputer) is used for the transmission controller 22, and according to a shift control program stored in a nonvolatile memory (an EEPROM 27 in this embodiment) that is a program memory inside the microcomputer 22. Control output data is generated corresponding to the input state signal and output to the I / F 21.

  FIG. 2 shows main components of the microcomputer 22. The microcomputer 22 includes a CPU 24, a common bus 25, a RAM 26, a nonvolatile memory EEPROM and an input / output port 28. The RAM 26 holds state data in which the I / F 21 is aggregated in units of 1 byte in state control (input signal) in shift control, operation data output to the automatic transmission 1, and state data output to the on-board system controller VSCC. , And the like for temporarily storing data such as input / output data and intermediate process data of arithmetic processing and logic processing.

The EEPROM 27 holds the operation program and reference data of the CPU 24 in a non-volatile manner. In this embodiment, the above-described shift control program and reference data used by the program (speed stage boundary data, lockup boundary data for determining shift characteristics) The boot program writing area 271 is set in the EEPROM 27 in addition to the “control data” writing area 273 for storing (installing) the others. Hereinafter, the shift control program and the reference data are collectively expressed as “control data”. The display on FIG. 2 shows a data writing state when the CPU 24 installs “control data” in the EEPROM 27 which is a nonvolatile memory inside the microcomputer 22 in accordance with the boot program.

  When the “control data” is installed in the microcomputer 22, the writing tool 29 storing the data transfer frame incorporating the “control data” shown in FIG. 2 is connected to the input / output port 28 via the I / F 23. In this embodiment, there are two types of data transfer frames for transferring “control data” to be installed in the microcomputer 22 from the writing tool 29, the first type and the second type.

  In the present embodiment, the first type data transfer frame is a non-compressed “first set amount” of a size for transferring data, which is a fixed amount of ½ or less of the free capacity of the RAM 26 when the installation is started. A protocol including write address data (3 bytes) of the EEPROM 27 is added to the head of the write area of “control data”.

  In the second type data transfer frame, a protocol including the write address data (3 bytes) of the EEPROM 27 is added to the head of the write area for “first set amount” of the compressed data of “control data”. The most significant 2 bits of the most significant byte of the byte address data are set to “01”. This address data represents an address exceeding the maximum address of the writing area of the EEPROM 27, that is, an address outside the storage area. The real address in this case is stored in the compressed data, and is obtained by decompressing the compressed data.

When transferring "control data" uncompressed to the microcomputer in the first-type data transfer frame, in the writing tool 29, if the total amount of "control data" uncompressed exceeds the "set amount", the entire The amount is divided in units of “second set amount”, an uncompressed first type data transfer frame of each division is generated, and held by the writing tool 29.

When transferring "control data" compressed by the second-type data transfer frame to the microcomputer, in the writing tool 29, to compress the "control data", the total amount of the compressed data is the "first set amount" When exceeding, the compressed data is divided in units of “first set amount”, the second type data transfer frame of the compressed data of each division is generated, and held by the writing tool 29. FIG. 2 shows a state in which the second type data transfer frame is generated and held by the writing tool 29 in this way.

The boot program 271 to start power-on immediately after, in the present embodiment, the second type data transfer frame compression (freezing, encoding) of the above-mentioned thawed "control data" (decompression, decoding) program 272 which is included are, decompresses the compressed "control data" using the decompression program 272. That is, to restore the "control data" uncompressed.

3 shows the CPU 24, the outline of the "control data" installation process. When the operating voltage is applied when the power is turned on, the CPU 24 activates the boot program 271 (step s1), and determines whether the writing tool is connected to the writing connection port (I / O 28 communication port) according to the boot program. (Step s2). In the following description, only the step identification code is described in parentheses without the word step.

  If the writing tool 29 is not connected, the CPU 24 activates the control program in the control program writing area 273 and starts the shift control according to the control program (s2-s11-s12).

However, if the writing tool 29 is connected, it communicates with the writing tool 29 to receive the first data transfer frame and write it into the RAM 26 (s2 to s4). Next, according to the most significant 2 bits data (compression identification information) of the most significant byte of the 3-byte write address data of the received frame, if it is “00”, the “ control data "a (non-compressed) as it is, the EEPROM 27, written after the address (start address) to which the 3-byte address data represents (s5, s6).

If the compression identification information is "01", the "control data" in the data transfer frame of the No. 1 (compression), the "control data" thawed RAM26 unzip with decompression program When the accumulated amount exceeds the above-mentioned “set amount”, the decompression is interrupted and the most significant 2 bits (compression identification information) of the 3-byte address data in the EEPROM 27 are read as “00”. Is written after the address (starting address) indicated by the data (s5-s7-s9). Then resumes thawed from interrupted next compressed data (s10-s7), also the amount of thawed "control data" is "second setting amount" of the size of the unit writing the "control data" above made and, where it interrupts the thaw, of EEPROM27, written after the next address to the final address is written to control data. Thus, to write to EEPROM27 of thawed "control data" weight "control data" thawing to suspend decompression each time becomes "second set amount" or more, the thawing and finish writing Resume.



Unlike the first set amount and the second set amount, the first set amount is sized to transfer the data, the second set amount is the size of a unit of writing the "control data" thawing.

Upon completion of the decompression of the compressed "control data" in the data transfer frame of No. 1, where it interrupts the thawed, writes the control data unzipped the EEPROM 27.

Of the "control data" of the data transfer frame of No. 1, CPU24 Upon completion of the writing to the EEPROM27 transfers the ready to write tool 29, data transfer frame of the writing tool 29 in response No. 2 to this Is transmitted to the microcomputer 22 (s3, s4).

  The data processing of the CPU 24 when the transfer data of the second data transfer frame is uncompressed is the same as the processing when the first data transfer frame is received (s5, s6).

If "control data" in the No. 2 data transfer frame was compressed data, the decompression that has been suspended, and resumed with the "control data" in the data transfer frame of the No. 2, thawed "control data" is written on the following address of EEPROM27 writing end address of the "control data" of the (received immediately before) the data transfer frame of No. 1. The other processes are the same as those when the first data transfer frame is received (s5-s7 to s10).

The reception process for the third and subsequent data transfer frames is the same as the reception process for the second data transfer frame. The "control data" storage area of the last data transfer frame, end (end) information after the "control data" is written. CPU24, upon detecting this end information, where writing the "control data" in the last data transfer frame which is stored in RAM to EEPROM 27, after the post-write end, the control of the control program writing area 273 The program is started and shift control is started according to the control program (s10-s3-s11-s12).

According to this embodiment, since the first type data transfer frame transferred uncompressed and the second type data transfer frame transferred after compression have the same fixed size, the on-vehicle control is performed with the same frame configuration. Can be transferred to the device. Since there is compression identification information in the data transfer frame, the necessity of decompression processing can be easily selected based on this. Sizes in large control data, because to transfer each divided by n divided to the microcomputer 22 as the data transfer frame from No. 1 to the n-th stored in EEPROM27 is a nonvolatile program memory, the RAM26 is 1 It is only necessary to have a capacity for writing and holding one data transfer frame and holding the decompressed control data in a set amount that is a unit for writing to the EEPROM 27. The compressed data of all control data (1 to n) and the data It does not require a large storage capacity to hold all the control data obtained by decompressing the compressed data at the same time. The read / write processing of the same data to the RAM 26 and the EEPROM 2727 does not increase significantly.

Moreover, in this embodiment, even during decompression of compressed "control data" of a data transfer frame, interrupted quantity control amount of data writing and decompress the control data thawed RAM26 is set, it reaches a decompression process Then, the decompressed control data is stored in the EEPROM 27, and the decompression process is restarted from the point where it was interrupted. This decompression and storage in the nonvolatile memory are performed by decompressing all the compression control data of the one data transfer frame. Since the process is repeated until the data is stored in the nonvolatile memory, no RAM overflow occurs. In this embodiment, since the set amount is set to ½ or less of the free capacity of the RAM 26, the data for the non-compression control data using the first type data transfer frame is not increased without particularly increasing the storage capacity of the RAM 26. storage to the transfer and EEPROM27 is of course possible thaw storage in transfer and EEPROM27 of the control data compressed using the second type data transfer frame.

It is a block diagram which shows the outline | summary of the transmission control system equipped with the on-vehicle control apparatus (22) of one Example of this invention. It is a block diagram which shows the main components of the microcomputer 22 shown in FIG. It is a flowchart which shows the outline | summary of the control implemented according to the program stored in EEPROM27 of CPU24 shown in FIG.

25: Common bus

Claims (6)

A RAM for temporarily writing data, and a non-volatile memory for storing control data including a program for controlling the operation of the on-board automatic device and reference data used in the execution of the program. A vehicle that holds state data representing the state of an on-board automatic device in the RAM, generates output data based on the state data, and controls the operation of the on-board automatic device using the output data. In the control data writing method of storing the control data in the nonvolatile memory of the upper control device,
Non-compressed control data to be stored in the non-volatile memory, and address data for specifying a storage address of the control data on the non-volatile memory , the first having a fixed size including compression identification information representing non-compression The fixed size including a seed data transfer frame, or compressed control data to be stored in the non-volatile memory, and address data that represents outside the address range of the non-volatile memory and includes compression identification information representing compression Receiving the second type data transfer frame of the same size,
When the compression identification information of the received data transfer frame represents non-compression, the control data of the data transfer frame is stored in the nonvolatile memory,
When the compression identification information of the received data transfer frame indicates compression, the control data of the data transfer frame is written into the RAM, the decompression process is started, the decompressed control data is written into the RAM, and the control is performed. When the amount of data reaches the set amount, the decompression process is interrupted, the decompressed control data is stored in the nonvolatile memory, and the decompression process is restarted from the interrupted location. Repeat until all data for compression control of the data transfer frame is decompressed and stored in the nonvolatile memory,
A method of writing control data to the on-vehicle control device.   2. The control data write to the on-vehicle controller according to claim 1, wherein the uncompressed control data amount of the first type data transfer frame is a fixed value, and the set amount is the fixed value. Method. The second type data transfer frame comprising said compressed the control data to be stored in non-volatile memory data and storage data divided into a plurality of said compression identification information is the data transfer frame, 1 When the storage data of one data transfer frame is compressed data and the decompressed control data is stored in the nonvolatile memory, the decompression process is interrupted, and when the next data transfer frame is received, the compression identification information of the data transfer frame When the data represents compression, the storage data of the data transfer frame is written in the RAM, and the decompression process is resumed from the point where it was interrupted, to the on-vehicle control device according to claim 1 or 2 . Method of writing control data. A RAM for temporarily writing data, and a non-volatile memory for storing control data including a program for controlling the operation of the on-board automatic device and reference data used in the execution of the program. Using the control data, the state data representing the state of the on-board automatic device is held in the RAM, output data is generated based on the state data, and the operation of the on-board automatic device is controlled by the output data. In the on-vehicle control device,
The control data to be stored in the non-volatile memory and the address data for specifying the storage address of the control data on the non-volatile memory, the data representing non-compression are the address data itself, and the one representing compression , the non-compression identifier information is representative of the outside of the address range of the memory, including the control data receives the data transfer frame of the same fixed size regardless of whether the compressed or non-compressed,
If the compression identification information does not represent compression, the control data of the data transfer frame is stored in the nonvolatile memory,
When said compression identification information is a representative of a compression, the data control data transfer frame starts decompression processing is written to the RAM, the write and the control in the RAM of the control data thawed When the data amount reaches the set amount, the decompression process is interrupted, the decompressed control data is stored in the nonvolatile memory, and the decompression process is restarted from the interrupted location. An on-vehicle control device characterized by repeating until all the compression control data of the data transfer frame is decompressed and stored in the nonvolatile memory. The on-vehicle control device according to claim 4 , wherein an uncompressed control data amount of the first type data transfer frame is a fixed value, and the set amount is the fixed value. Wherein the data transfer frame for transferring the compressed data of the control data, the absence nonvolatile storage data compressed data of the control data is divided into a plurality for storage in memory and said storage data or compressed data Each of the data transfer frames including the compression identification information representing the data, and when the storage data of one data transfer frame is the compressed data and the decompressed control data is stored in the nonvolatile memory, the decompression process is interrupted. When the next data transfer frame is received, if the compression identification information of the data transfer frame indicates compression, the storage data of the data transfer frame is written in the RAM and decompressed from the interrupted point. The on-vehicle control device according to claim 4 , wherein the control is resumed.

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