JPH06259284A - Adjusting device for electronic control unit - Google Patents

Abstract

PURPOSE:To miniaturize the device by reducing the storage capacity of a memory part and to prevent an electronic control unit(ECU) from being erroneously operated by the unexpected reloading of program contents. CONSTITUTION:This device is provided to debug the stored contents in a memory part (ROM) 22 of an ECU 2. The ROM 22 of the ECU 2 is composed of a program ROM 22a for storing control programs and a data ROM 22b for storing control data. The device is provided with first and second memory parts (RAM) 12 and 13 for reading and writing the stored contents in the ROM 22b and a stored content reloading part 14 for reloading the stored contents read by the RAM. Preferably, two pieces of RAM 12 and 13 are provided and a bus switching part 16 for switching a bus is provided. The bus switching part 16 is provided to respectively connect one of two RAM 12 and 13 to the ROM 22 on the ECU side and the other RAM to the stored content reloading part 14 and to switch this connecting state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adjusting device for debugging the contents stored in a memory section of an electronic control unit.

[0002]

2. Description of the Related Art Generally, an electronic control unit (ECU) used in automobiles, home electric appliances and the like has a CPU and a ROM as a memory section. When developing this ECU, it is necessary to take out the contents stored in the ROM and rewrite it for debugging. In particular, in the case of an ECU used for automobile engine control, ABS control, etc., it is necessary to record the correlation between the behavior of the automobile and the control program in real time for further consideration.

Conventionally, an ECU adjusting device for this purpose has a RAM as a memory unit capable of reading and writing the memory content of the ROM of the ECU, and the memory content of the ROM is rewritten by rewriting the memory content. It is known that the contents are rewritten.

[0004]

However, in the above-mentioned conventional device, all the stored contents of the ROM of the ECU are subject to rewriting. Therefore, when the ROM of the ECU has a large storage capacity, the adjustment device side also It is necessary to prepare a RAM having a storage capacity equivalent to that, and there is a problem that the device becomes large. Also, since the program area in the ECU can be rewritten, there is a risk that the ECU malfunctions due to careless rewriting of the program content.

The present invention has been made in view of the above points, and an object of the present invention is to divide a program area and a data area in the ECU and read them individually into a memory unit (ROM). By making the memory unit rewritable, the storage capacity of the memory unit can be reduced to achieve miniaturization, and an ECU adjustment device that can prevent malfunction of the ECU due to careless rewriting of the program contents is provided. .

[0006]

To achieve the above object, the invention according to claim 1 provides an adjusting device for debugging the stored contents of a memory section of an electronic control unit,
The memory section of the electronic control unit is divided into a program memory section for storing a control program and a data memory section for storing control data. On the other hand, a memory unit capable of reading and writing the storage content of either one of the program memory unit and the data memory unit and a storage content rewriting unit for rewriting the storage content read into the memory unit are provided.

The invention according to claim 2 is dependent on the invention according to claim 1, and is provided with two memory sections capable of reading and writing the stored contents of either the program memory section or the data memory section. One of the two memory units is connected to the electronic control unit side, the other is connected to the storage content rewriting unit, and a switching unit for switching the connection state is provided.

[0008]

With the above construction, in the invention according to claim 1,
One of the control program and the control data stored in the memory unit (program memory unit and data memory unit) of the electronic control unit is first written in the memory unit of the adjustment device. Thereafter, the stored content (control program or control data) read into the memory section is rewritten by the stored content rewriting section, whereby the stored content on the electronic control unit side is rewritten. In this case, the storage capacity of the memory unit of the adjusting device may be the same as the storage capacity of the program memory unit or the data memory unit of the memory unit of the electronic control unit. In particular, when the control data is read into the memory section of the adjusting device, malfunction of the electronic control unit due to careless rewriting of the control program is prevented.

According to the second aspect of the present invention, when the stored contents of the memory section of the electronic control unit are read out and rewritten, first, one memory section on the adjusting device side is set to the memory section of the electronic control unit by the switching section and then the adjusting apparatus. The memory content of the other memory unit is rewritten by the memory content rewriting unit in a state where the other memory unit on the side is connected to the memory content rewriting unit. Then, after switching the connection state by the switching unit, the stored contents of the memory unit on the adjusting device side newly connected to the stored contents rewriting unit are rewritten. As described above, even when the stored contents of the memory unit on the adjustment device side are rewritten, the electronic control unit is connected to one of the memory units on the adjustment device side so that the electronic control unit can be turned off. It is possible to rewrite the stored contents without having to change.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an adjusting apparatus 1 according to an embodiment of the present invention, which is an electronic control unit (EC).
U) 2 has a so-called ROM emulation function of changing the contents stored in a data ROM 22b described later.

A CPU 21 and a memory unit 22 are built in the ECU 2. The memory unit 22 is composed of a program ROM (read only memory) 22a as a program memory unit for storing a control program and a data ROM 22b as a data memory unit for storing control data (constant, MAP value), Both ROMs
Both 22a and 22b are mounted by IC sockets. When connecting the data ROM 22b to the adjusting device 1, the data ROM 22b is removed and connected to the interface connector 11 of the adjusting device 1 via the ROM cable 23. The ECU 2 may be connected to the adjusting device 1 by providing an interface connector for ROM only on the ECU 2 side.

The adjusting device 1 includes, in addition to the interface connector 11, first and second RAMs (random access memories) as two memory units capable of reading and writing the stored contents (control data) of the data ROM 22b of the ECU 2 respectively. ) 12 and 13, and a storage content rewriting unit 14 that rewrites the storage content read into the RAMs 12 and 13,
One of the two RAMs 12 and 13 is rewritten by the rewriting command section 15 for instructing the stored content rewriting section 14 to rewrite.
The data ROM 22b of the CU 2 is provided with a bus switching unit 16 which connects the other to the storage content rewriting unit 14 and switches the connection state.

The first and second RAMs 12 and 13 are
Each of them has a storage capacity equivalent to that of the data ROM 22b of the ECU 2, and is provided so that the storage content of the data ROM 22b is read at the time of access from the ECU 2 and the storage content is rewritten at the time of access from the storage content rewriting unit 14. There is.

The storage content rewriting unit 14 is a rewriting command unit 1
A control command is sent to the bus switching unit 16 (more specifically, the switching control unit 16a) based on the command from the RAM 5, and the control command includes a RAM switching command and a memory content rewriting command. There is. The RAM switching command switches the bus connection state in the bus switching unit 16 to switch between the two RAMs.
One of 12 and 13 is selected, and the stored content rewrite command is issued to the selected one of the RAMs 1.
It is a command to rewrite the stored contents to 2 and 13. The rewrite command unit 15 requests the user (R
Rewriting of the stored contents of the AMs 12 and 13) is sent to the stored contents rewriting unit 14.

Further, the bus switching section 16 has a connector side terminal 16b connected to the interface connector 11 via a bus 31 and a first RAM side terminal 16c connected to the first RAM 12 via a bus 32. Second R
The second RAM side terminal 16d is connected to the AM 13 via the bus 33, and the rewriting section side terminal 16e is connected to the storage content rewriting section 14 via the bus 34. Then, the stored content rewriting unit 1 is sent to the switching control unit 16a of the bus switching unit 16.
When a Low level signal is input from No. 4, the connector side terminal 16b and the first RAM side terminal 16c are connected to connect the first RAM 12 to the interface connector 11 and thus the data ROM 22 of the ECU 2 as shown by the solid line in the figure.
b and the rewriting portion side terminal 16e and the second RA
The second RAM 13 is connected to the storage content rewriting unit 14 by connecting to the M-side terminal 16d. When a High level signal is input from the storage content rewriting unit 14 to the switching control unit 16a of the bus switching unit 16, as indicated by the broken line in the figure,
The connector side terminal 16b and the second RAM side terminal 16d are connected to connect the second RAM 13 to the interface connector 1
1 and by extension, to the data ROM 22b of the ECU 2, the rewriting unit side terminal 16e and the first RAM side terminal 16c.
Are connected to connect the first RAM 12 to the storage content rewriting unit 14.

Next, the operation of the above embodiment will be described.

When the adjusting device 1 and the ECU 2 are powered on and the RAMs 12 and 13 are set up,
First, the memory content rewriting unit 14 is transferred to the bus switching unit 16
A level signal is output to connect the second RAM 13 to the ECU 2 side. Then, from the ECU 2 side, the second RAM
After specifying the address for 13, output the data,
The contents stored in the data ROM 22b of the ECU 2 are the same. Subsequently, the memory content rewriting unit 14 outputs a Low level signal to the bus switching unit 16 to cause the first RAM 12 to be controlled by the ECU.
Connect to side 2. Then, from the ECU 2 side, the first R
After the address is designated to the AM 12, the data is output to be the same as the stored content of the data ROM 22b of the ECU 2. After the RAMs 12 and 13 have been set up in this way, the CPU 21 of the ECU 2 is
Instead of 2b, the first RAM 12 or the second RAM 13 of the adjusting device 1 is accessed.

When the user subsequently requests the rewriting of the storage content (control data) of the data ROM 22b, the rewriting command section 15 first calculates the address and data of the data ROM 22b, and stores the calculated address and data. Output to 14. Then, the memory content rewriting unit 14 is the bus switching unit 1
A High level signal is output to 6 to connect the second RAM 13 to the data ROM 22b of the ECU 2 and the first RAM 12 to the storage content rewriting unit 14, respectively. Then, the first
After the address is specified for the RAM 12, the data is output and the stored contents are rewritten. During this rewriting, E
Since the CU 2 is connected to the second RAM 13 and can be accessed, it is not necessary to turn off the power of the ECU 2.

Thereafter, the storage content rewriting unit 14 outputs a Low level signal to the bus switching unit 16 to output the first RA.
M12 is stored in the data ROM 22b of the ECU 2 and the second RA
The M13s are connected to the memory content rewriting section 14, respectively. Then, after designating an address for the second RAM 13,
Output the data and rewrite the stored contents. During this rewriting, the ECU 2 is connected to the first RAM 12 and can access it, so it is not necessary to turn off the power of the ECU 2.

Thereafter, the stored content rewriting section 14 outputs a high level signal to the bus switching section 16 to restore the connection state to the original state. By the above, the rewriting of the stored contents of the data ROM 22b is completed.

As described above, it is not necessary to turn off the power of the ECU 2 each time the stored contents of the data ROM 22b (actually, stored contents of the RAMs 12 and 13) are rewritten.
The rewriting operation can be easily performed correspondingly, and the rewriting operability can be improved.

In addition, the first and second RAMs 12,
Since all 13 need only have the same storage capacity as that of the data ROM 22b in the memory unit 22 of the ECU 2, these RAMs 12, 13 and thus the adjusting device 1 can be made smaller and less expensive. In addition, the data ROM 22b
Since the control program stored in the program ROM 22a is not rewritten at the time of rewriting the storage content of the
It is possible to prevent the malfunction of U2.

The present invention is not limited to the above embodiment, but includes various other modifications.
For example, in the above embodiment, the memory unit 22 of the ECU 2 is
A program ROM 22a for storing a control program,
Although the case where the data ROM 22b for storing the control data is divided and the stored contents (control data) of the data ROM 22b is rewritten has been described, the present invention connects the program ROM 22a to the adjusting device 1 side and executes the program R
The storage content (control program) of the OM 22a may be rewritten. Also in this case, it is possible to contribute to downsizing and cost reduction of the adjusting device.

[0025]

As described above, according to the adjusting device for the electronic control unit in the invention described in claim 1, only the control program or the control data in the memory contents on the electronic control unit side is written in the memory section and rewritten. Since this is performed, the storage capacity of the memory unit can be reduced, and the memory unit and thus the device can be made smaller and less expensive. In particular, when only the control data is written in the memory section, it is possible to prevent the malfunction of the electronic control unit due to the careless rewriting of the control program.

According to the second aspect of the invention, the stored contents can be rewritten without turning off the power of the electronic control unit, and the rewriting operability can be improved. Also has.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of an adjusting device according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Adjustment device 2 Electronic control unit (ECU) 12, 13 RAM (memory part of adjustment device) 14 Storage content rewriting part 16 Bus switching part 22 ROM (memory part of electronic control unit) 22a Program ROM (program memory part) 22b Data ROM (data memory section)

Claims (2)

[Claims] 1. An adjusting device for debugging the stored contents of a memory section of an electronic control unit, wherein the memory section of the electronic control unit comprises a program memory section for storing a control program and data for storing control data. The memory unit is divided into a memory unit, and includes a memory unit capable of reading and writing the memory contents of either the program memory unit or the data memory unit, and a memory content rewriting unit for rewriting the memory contents read into the memory unit. An adjusting device for an electronic control unit characterized by the above. 2. Two memory units capable of reading and writing the stored contents of one of the program memory unit and the data memory unit are provided. Of the two memory units,
2. The electronic control unit adjusting device according to claim 1, further comprising a switching unit that connects one to the electronic control unit side and the other to the storage content rewriting unit and switches the connection state.