JP2012108822A - Initialization device and initializing method for nonvolatile memory - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve simplification of procedure of initialization for nonvolatile memory and to provide an inspection device with a minimum configuration required for an inspection.SOLUTION: A rewriting signal that rewrites a specific value of nonvolatile memory is input into an electronic control unit beforehand, and an initial processing is executed for a nonvolatile memory at a power activation. If it is determined that initialization of the nonvolatile memory is necessary at the initial processing, the rewriting signal performs initialization processing for rewriting the specific value of nonvolatile memory for the nonvolatile memory.

Description

  The present invention relates to a technical field of a non-volatile memory initialization device and an initialization method for initializing a non-volatile memory used in, for example, an electronic control device mounted on a vehicle or the like.

  Conventionally, many electronic control units (ECUs) are used for various controls such as vehicle engine control, transmission control, clutch control, and change lever control. As this ECU, an ECU using a non-volatile memory (EEPROM) is known (for example, see Patent Document 1). The EEPROM used in the ECU described in Patent Document 1 stores a learning value acquired during control, a failure code (diag code) for determining a system failure, and the like.

  By the way, since the EEPROM is in a state where nothing is recorded when the ECU is assembled, the EEPROM has an initial value for initializing data to be stored when the power is first turned on. In addition, inspection is performed by an inspection device at the time of shipment of a vehicle or the like equipped with an ECU, and various inappropriate learning values are recorded in the EEPROM to be inspected by the inspection device at the time of this inspection, or various inefficiencies are recorded. Appropriate diagnostic codes are recorded.

Japanese Patent No. 4281222.

  However, when such various learning values and various diagnosis codes are recorded at the time of inspection, it is necessary to end these inspections by resetting these learning values or deleting the diagnosis code at the end of inspection. is there. In addition, after the reset of the learning value or after the erasure of the diagnosis code, a new inappropriate learning value or a new inappropriate diagnosis code is not recorded again in the EEPROM. An inspection procedure and an inspection apparatus that do not judge the above are required. For this reason, there is a problem that not only the initialization procedure of the EEPROM becomes complicated, but also the configuration of the inspection apparatus becomes complicated.

  The present invention has been made in view of such circumstances, and an object of the present invention is to simplify the initialization procedure of the nonvolatile memory and to make the inspection device the minimum configuration necessary for the inspection. An initialization apparatus and initialization method for a non-volatile memory that can be performed are provided.

  In order to solve the above-described problems, the initialization apparatus for a nonvolatile memory according to the present invention receives a signal for rewriting a specific value of the nonvolatile memory in advance and applies the signal to the nonvolatile memory when the power is turned on. The nonvolatile memory initial processing means for performing an initial process, and when the initialization process by the nonvolatile memory initial processing means determines that the initialization of the nonvolatile memory is necessary, the signal causes the nonvolatile memory to be initialized. And a nonvolatile memory initialization processing means for performing initialization processing for rewriting a specific value of the nonvolatile memory.

Further, the initialization method of the nonvolatile memory according to the present invention inputs a signal for rewriting a specific value of the nonvolatile memory in advance to the electronic control device, performs initial processing on the nonvolatile memory by turning on the power, When it is determined that the initialization of the nonvolatile memory is necessary in the initial process, an initialization process for rewriting a specific value of the nonvolatile memory is performed on the nonvolatile memory by the signal.

  According to the initialization apparatus and the initialization method of the nonvolatile memory according to the present invention configured as described above, a signal for rewriting a specific numerical value of the nonvolatile memory is input to the nonvolatile memory initial processing unit in advance, and then When the power is turned on, the nonvolatile memory initial processing means performs initialization processing of the nonvolatile memory, and the nonvolatile memory initialization means performs initialization processing of the nonvolatile memory. Thus, for example, by inputting a signal for rewriting the above-mentioned specific numerical value to the nonvolatile memory initial processing means before the inspection at the time of factory shipment, the initial processing and initial processing of the nonvolatile memory can be performed only by turning on the power after the inspection. Can be automatically performed. Therefore, the numerical value of the non-volatile memory is rewritten, the inappropriate learning value recorded at the time of the inspection can be automatically reset, and the inappropriate diagnostic code can be automatically deleted. Further, it is possible to prevent a new inappropriate learning value or a new inappropriate diagnostic code from being recorded in the nonvolatile memory again after the learning value is reset or the diagnostic code is deleted.

  In this way, a special inspection procedure and a special inspection device can be dispensed with only by automatically initializing the nonvolatile memory simply by turning on the power after the inspection. Therefore, the initialization procedure of the nonvolatile memory can be simplified, the inspection work can be reduced, and further, the inspection apparatus can be configured to be the simplest configuration necessary for the inspection. Is possible.

  Further, a load equivalent to an actual vehicle is not required at the time of inspection, and the same electronic control device can be inspected by the same inspection device regardless of the vehicle type or the vehicle type. Furthermore, initialization of all data in the nonvolatile memory can be ensured by one operation, that is, power-on, and the possibility of data initialization omission can be reduced and the work can be further reduced. it can.

It is a block diagram which shows an example of embodiment of the initialization apparatus of the non-volatile memory which concerns on this invention. It is a figure which shows the flow of the initial process of EEPROM. It is a figure which shows the flow of the initialization process of EEPROM.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing an example of an embodiment of a nonvolatile memory initialization apparatus according to the present invention.

  As shown in FIG. 1, a nonvolatile memory initialization device 1 of this example is disposed in, for example, an electronic control unit (ECU) 2 mounted on a vehicle, and a nonvolatile memory (EEPROM) used in the ECU 2 ) 3 is initialized. The nonvolatile memory initialization device 1 includes an EEPROM initial processing means 4 and an EEPROM initialization means 5. The EEPROM initial processing means 4 can be electrically connected to a power source 7 via an ignition key switch 6.

The initial processing of the EEPROM 3 is performed by the EEPROM initial processing means 4 and the initialization processing of the EEPROM 3 is performed by the EEPROM initializing means 5. E
In the initial processing of the EPROM 3, the power source 7 is turned on by turning on the ignition key switch 6 in the process before inspection of the vehicle at the time of shipment of the vehicle from the factory. Enter in. Then, the vehicle to be inspected is inspected and the inspection result is obtained. At this time, various inappropriate learning values are recorded in the EEPROM 3 by the inspection device, and various inappropriate diagnostic codes are recorded. Upon completion of the inspection, the ignition key switch 6 is turned off and the power source 7 is shut off. When the ignition key switch 6 is turned on again, the power supply 7 is turned on. As a result, the initial processing of the EEPROM 3 is performed by the EEPROM initial processing unit 4 and the initialization processing of the EEPROM 3 is performed by the EEPROM initializing unit 5. By the initial process and initialization process of the EEPROM 3, the numerical value of the EEPROM 3 is rewritten, the inappropriate learning value recorded at the time of inspection is automatically reset, and the inappropriate diagnostic code is automatically deleted. The In addition, a new inappropriate learning value or a new inappropriate diagnostic code is not recorded in the EEPROM 3 again after the learning value is reset or the diagnostic code is erased.

FIG. 2 is a diagram showing a flow of initial processing of the EEPROM, and FIG. 3 is a diagram showing a flow of initialization processing of the EEPROM.
As shown in FIG. 2, the initial process of the EEPROM 3 is started when the ignition key switch 6 is turned on and the power supply 7 is turned on after the inspection at the time of shipment from the factory is completed. First, in step S1, it is determined whether or not a plurality of locations in the EEPROM 3 coincide with specific numerical values stored in the initialization device 1 of the nonvolatile memory. If it is determined that a plurality of locations in the EEPROM 3 and the specific numerical values of the initialization device 1 of the nonvolatile memory match, the specific numerical values matched in step S2 match the specific numerical values defined in the program for executing the initial process. It is determined whether or not to do so. If it is determined that the specific numerical value stored in the initialization device 1 of the non-volatile memory matches the specific numerical value of the program, in step S3, the check items of the stored data in the EEPROM 3 are confirmed, and whether the stored data is correct or incorrect Is judged. If it is determined that the data stored in the EEPROM 3 is correct, the data stored in the EEPROM 3 is read in step S4, and after the stored data read is confirmed, the initial process of the EEPROM 3 is completed.

  If it is determined in step S1 that a plurality of locations in the EEPROM 3 and specific numerical values of the initialization device 1 of the nonvolatile memory do not match, the control data stored in the EEPROM 3 is forcibly initialized in step S5. That is, when it is determined that initialization of the EEPROM 3 is necessary in the initial process, the initialization process of the EEPROM 3 is performed. As shown in FIG. 3, in the initialization of the control data, it is first determined in step S6 whether an initialization execution condition is satisfied. If it is determined that the initialization execution condition is satisfied, a specific numerical value of the EEPROM is rewritten in step S7 by a rewrite signal input in advance before inspection at the time of factory shipment. As a result, initialization of the EEPROM 3 is completed and initial processing of the EEPROM 3 is completed. If it is determined in step S6 that the initialization execution condition is not satisfied, the initialization of the EEPROM 3 is finished as it is, and the initial process of the EEPROM 3 is finished.

  Further, if it is determined in step S2 that the specific numerical value stored in the initialization device 1 of the non-volatile memory does not match the specific numerical value of the program, the process proceeds to step S5, and the processing after step S5 is performed. Is called. Further, if it is determined in step S3 that the data stored in the EEPROM 3 is incorrect, the process similarly proceeds to step S5, and the processes after step S5 are performed.

According to the nonvolatile memory initialization device 1 of this example, a signal for rewriting a specific numerical value of the EEPROM 3 is input to the EEPROM initial processing means 4 in advance, and then the power is turned on so that the EEPROM initial processing means 4 The initialization process of the EEPROM 3 is performed, and the initialization process of the EEPROM 3 is performed by the EEPROM initialization unit 5. Thereby, for example, by inputting a signal for rewriting the above-mentioned specific numerical value to the EEPROM initial processing means 4 before inspection at the time of factory shipment, initial processing and initialization processing of the EEPROM 3 can be performed only by turning on the power after the inspection. It can be done automatically. Therefore, the numerical value of the EEPROM 3 is rewritten, and an inappropriate learning value recorded at the time of inspection can be automatically reset and the diagnosis code can be automatically deleted. Further, it is possible to prevent a new learning value or a new diagnosis code from being recorded in the EEPROM 3 again after the learning value is reset or after the diagnosis code is deleted.

  Thus, the special inspection procedure and the special inspection device can be dispensed with only by automatically initializing the EEPROM 3 by turning on the power after the inspection. Therefore, the initialization procedure of the EEPROM can be simplified, the inspection work can be reduced, and the inspection apparatus can be made the simplest configuration necessary for the inspection. It becomes.

  Further, a load equivalent to an actual vehicle is not required at the time of inspection, and the same ECU can be inspected by the same inspection device regardless of the vehicle type or the vehicle type. Further, initialization of all data in the EEPROM 3 can be ensured by one operation, that is, power-on, so that the possibility of data initialization omission can be reduced and the work can be further reduced.

  In addition, this invention is not limited to the above-mentioned example, A various design change is possible within the range of the technical matter described in the claim.

  The nonvolatile memory initialization device according to the present invention can be suitably used as a nonvolatile memory initialization device for initializing a nonvolatile memory used in an electronic control device mounted on, for example, a vehicle.

DESCRIPTION OF SYMBOLS 1 ... Nonvolatile memory initialization apparatus, 2 ... Electronic control unit (ECU), 3 ... Nonvolatile memory (EEPROM), 4 ... EEPROM initial processing means, 5 ... EEPROM initialization means, 6 ... Ignition key switch, 7 ... Power supply

Claims (2)

A signal for rewriting a specific value of the nonvolatile memory in advance, and the nonvolatile memory initial processing means for performing an initial process on the nonvolatile memory at power-on;
Initialization for rewriting a specific value of the nonvolatile memory in the nonvolatile memory by the signal when it is determined that the initialization of the nonvolatile memory is necessary in the initial processing by the nonvolatile memory initial processing means A nonvolatile memory initialization apparatus comprising: a nonvolatile memory initialization processing means for performing processing. Input a signal to rewrite a specific value of the nonvolatile memory in advance to the electronic control unit,
When the power is turned on, initial processing is performed on the nonvolatile memory,
When it is determined that the initialization of the nonvolatile memory is necessary in the initial process, an initialization process for rewriting a specific value of the nonvolatile memory is performed on the nonvolatile memory by the signal. Nonvolatile memory initialization method.

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