JP2011149368A - Method of storing device intrinsic data, and method of storing device intrinsic correction value - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To store data intrinsic to a device used when controlling an operation of the device by executing a program, into a storage medium provided in the device, without bringing an increase of component cost of the device and an increase of a substrate mounting area. <P>SOLUTION: A flash memory 18 is provided in a driving circuit of a motor M1 of a fuel pump for supplying fuel to a fuel injection device. A correction value storage program is stored together with a control program used in drive control for the motor M1 by a control part 14, in a program storage area 18a of the flash memory 18. A correction value data storage area 18b of the flash memory 18 is brought initially into an erased state. The correction value storage program is executed at the time of initial drive control by the control program, and a correction value for matching an actual rotational number of the motor M1 with a rotational number (ideal value) set on control is found to be stored in the correction value data storage area 18b. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method of storing data unique to a device and a method of storing correction values unique to a device, and more particularly to controlling the operation of a device by executing a program stored in a flash memory mounted on the device. The present invention relates to a method of storing data and correction values specific to the apparatus used.

  For example, when controlling the fuel injection amount of a vehicle, in order to eliminate variations in the fuel injection amount due to individual differences in parts between vehicles, correction for eliminating individual differences obtained before and after the vehicle is shipped. Conventionally, data is stored in an EEPROM (for example, Patent Document 1).

JP 2008-19725 A

  For this reason, conventionally, it is necessary to mount a more expensive EEPROM in the device separately from the flash memory in which the program is stored, which causes an increase in the component cost of the device and an increase in the board mounting area. It has become.

  Such a problem is not limited to controlling the fuel injection amount of the vehicle, but stores, for example, unique data used for operation control of the mobile phone, such as a personal identification number in the mobile phone and owner-specific data. It is a problem that occurs in the same way. That is, such a problem is a problem that generally occurs when data unique to a device used for controlling the operation of the device by executing a program is stored in a storage medium provided in the device.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide data and correction values specific to the device used when controlling the operation of the device by executing a program, increase the component cost of the device, An object of the present invention is to provide a device-specific data storage method and a device-specific correction value storage method which can be stored in a storage medium provided in the device without increasing the board mounting area.

  In order to achieve the above object, the device-specific data storage method of the present invention described in claim 1 is used when controlling the operation of the control target by executing a program stored in a flash memory mounted on the device. A method of storing data unique to the device used, wherein an erase state area that is an erase state in which data can be written to an area other than the area where the program of the flash memory is stored, The step of executing the program in a state secured with a capacity necessary for storing the unique data, and the unique data generated by the operation control of the control target by the execution of the program, And storing it in the erased state area.

  According to the device-specific data storage method of the present invention as set forth in claim 1, by providing an erase state area in which data can be written in the flash memory in which the program is stored, an object to be controlled by executing the program The device-specific data generated by the operation control of the above can be stored in the flash memory together with the program.

  Therefore, it is not necessary to provide a readable / writable memory such as an EEPROM in the device for storing data unique to the device separately from the flash memory. Therefore, data specific to the apparatus is stored in a storage medium provided in the apparatus without increasing the component cost of the apparatus, increasing the mounting area of the board on which the flash memory is mounted, and consequently increasing the apparatus size. be able to.

  A device-specific data storage method according to a second aspect of the present invention is the device-specific data storage method according to the first aspect of the present invention, wherein the flash memory has a plurality of erase states. The block is reserved in an erase block different from the erase block in which the program is stored.

  According to the device-specific data storage method of the present invention described in claim 2, in the device-specific data storage method of the present invention described in claim 1, the erase block is erased in an erase block different from the erase block in which the program is stored. A status area is provided to store device specific data.

  Therefore, when it is necessary to update the data specific to the device, the erase block in which the unique data before update is stored is erased without updating the erase block in which the program is stored. Later unique data can be stored again.

  Furthermore, the device-specific data storage method of the present invention described in claim 3 is the device-specific data storage method of the present invention described in claim 1 or 2, wherein the specific data is obtained by executing the program. This is a correction value obtained from an actual measurement value of a predetermined event at the time of controlling the operation of the control target, and for making the actual measurement value coincide with an ideal value related to the predetermined event, and storing the unique data in the erase state area In the step, the correction value obtained from the measured value of the predetermined event by the operation control of the control target by the first execution of the program is stored in the erase state area as the unique data. It is characterized by.

  According to the device-specific data storage method of the present invention described in claim 3, the device-specific data storage method of the present invention described in claim 1 or 2 is stored in the flash memory mounted on the device. By controlling the operation of the controlled object by executing the program, an actual measurement value relating to a predetermined event caused by the operation can be obtained. Then, the correction value obtained from the difference between the actual measurement value and the ideal value is stored in the flash memory mounted on the apparatus.

  Therefore, with regard to a predetermined event that occurs during the operation control of the control target, the difference between the measured values that differ from device to device due to individual differences between devices and the difference between the measured values and the ideal value are required to match the measured values. The correction value can be reliably stored in a flash memory mounted on a target apparatus that performs the operation control of the control target by applying the correction value.

  In order to achieve the above object, a method for storing a correction value unique to an apparatus of the present invention described in claim 4 includes: a flash memory storing a program; and execution of the program based on an input of an external control signal A device having a control circuit for controlling the operation of the control object by the above-described method for storing correction values unique to the device used when controlling the operation of the control object, and capable of writing data The step of storing the program leaving the area of the capacity necessary for storing the correction value in the flash memory in the erased state, and inputting the control signal for inspection to the device from the outside of the device And an area of a capacity necessary for storing the correction value in the control circuit based on the input of the control signal for inspection to the apparatus is in an erased state. The step of executing the program stored in the remaining flash memory and the execution of the program by the control circuit based on the input of the control signal for inspection cause the control target to perform operation control. And generating the actual measurement value specific to the apparatus for the predetermined event, and the correction based on the ideal value and the actual measurement value of the predetermined event defined in the program Calculating a value; and storing the calculated correction value in an area left in the erased state of the flash memory.

  According to the correction value storing method unique to the apparatus of the present invention described in claim 4, when storing the program in the flash memory in the erased state, the area of the capacity necessary for storing the correction value is set in the erased state. Leave it alone. In the area of the flash memory left in the erased state, a correction value for a predetermined event generated by executing the program is stored. This correction value is calculated based on an actual measurement value acquired for a predetermined event when the program is executed after writing to the flash memory, and an ideal value defined in the program.

  For this reason, with respect to a predetermined event that occurs during the operation control of the controlled object, it is necessary for each device that is necessary to cancel the difference between the measured value that differs for each device due to individual differences between devices and to match the measured value to the ideal value. The correction value can be stored together with the program in a flash memory mounted on a target apparatus that performs operation control of the control target by applying the correction value.

  Therefore, it is not necessary to provide a read / write memory such as an EEPROM in the apparatus separately from the flash memory for storing correction values unique to the apparatus. For this reason, correction values unique to the device are stored in a storage medium provided in the device without increasing the component cost of the device or increasing the mounting area of the board on which the flash memory is mounted, and consequently the size of the device. Can be made.

  According to the device-specific data storage method and the device-specific correction value storage method of the present invention, device-specific data and correction values used when controlling the operation of the device by executing a program are transferred to the device components. The data can be stored in a storage medium provided in the apparatus without causing an increase in cost or an increase in board mounting area.

It is explanatory drawing which shows the drive circuit of the fuel pump which concerns on one Embodiment of this invention to which the storage method of the apparatus specific data by this invention and the storage method of the correction value peculiar to an apparatus are applied. FIG. 2 is an explanatory diagram showing a memory area map of a flash memory provided in the fuel pump drive circuit of FIG. 1. It is a flowchart which shows the procedure of the storage process of the specific data performed in the drive circuit of the fuel pump which concerns on one Embodiment of this invention. It is explanatory drawing which shows the memory area map of the flash memory provided in the drive circuit of the fuel pump which concerns on other embodiment of this invention.

  Hereinafter, a method for storing device-specific data and a method for storing device-specific correction values according to the present invention will be described with reference to the drawings.

  FIG. 1 is an explanatory diagram showing a fuel pump drive circuit according to an embodiment of the present invention to which a device-specific data storage method and a device-specific correction value storage method according to the present invention are applied.

  The fuel pump drive circuit shown in FIG. 1 includes a fuel pump motor M1 (corresponding to a control target in claims) that supplies fuel (fuel) to a vehicle fuel injection device (not shown). This is a circuit for driving using the power of the battery VB. The fuel pump drive circuit has a fuel pump control device 10 that controls the drive of the motor M1 based on the input of a control signal from the engine control ECU 21 of the vehicle.

  A transistor Q1 such as an IGN relay X1, a fuse F1, a fuel pump relay X2, a shunt resistor R1, and a P-type MOSFET is provided between the battery VB and the motor M1. Further, a transistor Q2 such as an N-type MOSFET is provided in parallel with the motor M1.

  The IGN relay X1 is energized when the ignition switch S1 mounted on the vehicle is turned on, and is switched from the off state to the on state.

  The fuel pump relay X2 is excited when an F / P drive signal is supplied from the engine control ECU 21, and is switched from the off state to the on state. The F / P drive signal is turned off, for example, when an airbag activation signal is generated, shuts down the circuit, and stops the motor M1.

  The fuel pump control device 10 for controlling the driving of the motor M1 includes a shunt resistor R1, a transistor Q1, and a transistor Q2, and further includes a current detection unit 11, a gate drive unit 12, a lock detection unit 13, and a control unit 14. , A diagnostic output unit 15, an input I / F 16 that performs noise removal and level adjustment, an output I / F 17, and a flash memory 18. The part excluding the shunt resistor R1, the transistor Q1, the transistor Q2, and the flash memory 18 of the fuel pump control device 10 is configured by, for example, a microcomputer.

  The current detector 11 detects the voltage generated at both ends of the shunt resistor R1, and detects the current I-P flowing through the transistor Q1 based on this voltage value and the resistance value of the shunt resistor R1.

  The lock detection unit 13 compares the current value detected by the current detection unit 11 with a preset threshold value of the lock current, and when the current value detected by the current detection unit 11 exceeds the threshold value. Output a lock signal. This lock signal is output to the control unit 14 and the diagnosis output unit 15.

  The control unit 14 generates a PWM signal based on a fuel pump control signal input from the engine control ECU 21 via the input I / F 16. That is, when a setting signal for setting the number of rotations of the motor M1 is input as a control signal from the engine control ECU 21, a PWM signal having a duty ratio corresponding to the number of rotations is generated, and this PWM signal is used as a gate drive unit. 12 is output.

  The above-described operation by the control unit 14 is performed by executing a program stored in the flash memory 18. The entire flash memory 18 is configured as a single erase block. As shown in the memory area map of FIG. 2, the flash memory 18 has a program storage area 18a in which programs are stored and a correction value data storage area 18b in which correction value data as unique data described later is stored. is doing.

  The program stored in the program storage area 18a of the flash memory 18 includes a control program and a correction value storage program. The control program is a program for controlling the driving of the motor M1 based on a fuel pump control signal input from the engine control ECU 21. The correction value storage program is a program for acquiring the correction value data described above and storing it in the correction value data storage area 18b of the flash memory 18.

  The correction value storage program is executed when the control program is executed for the first time. When the correction value storage program is executed, it is required to obtain and input a correction value. When a correction value is input to the control unit 14 in response to this request, the input correction value is stored as correction value data in the correction value data storage area 18b.

  The above-described correction value is a value obtained from an actual measurement value of “result” in which the driving of the motor M1 is controlled by the first execution of the control program, and the motor according to the control program is used to match the actual measurement value with the ideal value. This is a value used thereafter in the drive control of M1. Therefore, the correction value data stored in the correction value data storage area 18b is device-specific data reflecting individual differences among the motor M1, the fuel pump, and the fuel injection device.

  This correction value may be obtained automatically by measuring an actual measurement value on a correction value storage program, or may be obtained manually separately. In the present embodiment, the correction value is obtained by the latter manual operation. The “result” may be, for example, the number of rotations of the motor M1 or the amount of fuel supplied by the fuel pump. In the present embodiment, it is assumed that the number of rotations of the former motor M1 is “result”.

  The control program is written (stored) in the flash memory 18 in a state where the entire memory area is erased. The correction value data storage area 18b remains in the erased state until the control program is executed for the first time. Therefore, in the present embodiment, the correction value data storage area 18b corresponds to the erase state area in the claims.

  The gate drive unit 12 outputs a drive signal to the gates of the transistors Q1 and Q2 based on the PWM signal output from the control unit 14, and the transistors Q1 and Q2 are turned on and off at a desired frequency and duty ratio. Make it work. At this time, a dead time is provided so that the two transistors Q1 and Q2 are not simultaneously turned on.

  The diagnosis output unit 15 generates a diagnosis signal when a lock signal is output from the lock detection unit 13, and this diagnosis signal is output to the engine control ECU 21 via the output I / F 17. Thus, the engine control ECU 21 activates an alarm lamp or an alarm sound to notify the vehicle occupant that the fuel pump is locked.

  The fuel pump control device 10 configured as described above performs approximately the following operation with respect to control of driving of the motor M1. That is, when the F / P relay drive signal is output from the engine control ECU 21, the fuel pump relay X2 is turned on, and the battery VB and the fuel pump control device 10 are electrically connected. Furthermore, when a control signal is input from the engine control ECU 21, the fuel pump control device 10 starts driving the fuel pump. That is, the control unit 14 generates a PWM signal having a duty ratio suitable for rotating the motor M1 at the rotation speed set by the setting signal, and outputs the PWM signal to the gate driving unit 12.

  Then, the gate driver 12 turns on / off the transistor Q1 and turns on / off the transistor Q2 at a timing opposite to that of the transistor Q1 by the PWM signal. As a result, a periodically changing voltage Vout is generated at the terminal of the motor M1.

  At this time, a current IP that changes in conjunction with the voltage Vout flows from the transistor Q1 to the motor M1, and a current IN that changes in conjunction with the voltage Vout flows from the transistor Q2 to the motor M1. A current IM having a waveform that changes in a sawtooth shape with a positive current value flows through the motor M1. As a result, the motor M1 rotates at a desired rotational speed, and the fuel pump rotates to supply fuel.

  Next, referring to the flowchart of FIG. 3, the flow of processing when storing correction value data in the correction value data storage area 18b by executing the correction value storage program stored in the program storage area 18a of the flash memory 18 will be described. explain. FIG. 3 is a flowchart showing a procedure of correction value data storage processing performed in the fuel pump drive circuit of the present embodiment. In this embodiment, as shown below, the process of step S1-step S5 in the flowchart of FIG. 3 is performed.

  First, a fuel pump drive circuit of this embodiment is mounted on a vehicle (not shown) together with a fuel injection device, and then an inspection control signal is input from the engine control ECU 21 (step S1). Next, the control program stored in the program storage area 18a of the flash memory 18 is executed for the first time by the input control signal for inspection (step S2). Then, the actual rotational speed (actual value) of the motor M1 rotated at the rotational speed set by the inspection control signal (as a setting signal) is measured using a rotation sensor (not shown) or the like (step S3). ). Subsequently, a correction value is calculated from the difference between the rotation speed set by the control signal for inspection and the measured actual rotation speed (step S4). This correction value is a value necessary for making the actual rotational speed coincide with the rotational speed (ideal value) set by the control signal for inspection.

  Then, in response to the request from the control unit 14 by executing the correction value storage program stored in the program storage area 18a of the flash memory 18, the correction value obtained as described above is used as the flash memory in the erased state. 18 is stored as correction value data in the correction value data storage area 18b (step S5). Here, the correction value input request and input can be performed using, for example, a display and a keypad (both not shown) connected to the control unit 14.

  When the correction value data is stored in the correction value data storage area 18b as described above, when the control program is subsequently executed, the rotational speed set by the control signal input from the engine control ECU 21 is Correction is performed by correction value data (correction value) in the correction value data storage area 18b. Then, the motor M1 is driven and controlled by the control unit 14 so that the rotational speed after the correction is controlled. Thereby, the actual rotational speed of the motor M1 becomes the rotational speed set by the control signal from the engine control ECU 21.

  As described above, according to the present embodiment, the correction value data (correction value) used at the first and subsequent executions of the control program stored in the program storage area 18a of the flash memory 18 is flashed at the first execution of the control program. The correction value data storage area 18b in the erase state of the memory 18 is stored. For this reason, it is not necessary to separately use a memory such as an EEPROM for storing correction value data. Therefore, the flash memory provided in the fuel pump drive circuit with correction value data specific to the device (fuel pump drive circuit or fuel injection device) without causing an increase in the component cost of the device or an increase in the board mounting surface seat 18 can be stored.

  If the correction value data (correction value) needs to be updated due to replacement of the fuel pump drive circuit or the fuel injection device, step S0 in the flowchart of FIG. 3 is performed before step S1. do it. That is, for example, in a vehicle dealer or manufacturer, first, the entire flash memory 18 is erased, and then the control program and the correction value storage program are stored in the program storage area while the correction value data storage area 18b is secured in the erased state. Write again to 18a. Thereafter, the correction value data (correction value) is obtained and stored in the correction value data storage area 18b according to the procedure from step S1 to step S5 in FIG.

  Even when the control program and the correction value data (correction value) are stored in the new flash memory 18, that is, the flash memory 18 in which nothing is stored in the erased state as a whole, steps S0 to S5 in FIG. You can follow the procedure.

  Incidentally, in the above-described embodiment, the number of revolutions of the motor M1 required for calculation of the correction value stored in the correction value data storage area 18b of the flash memory 18 by the control signal (setting signal) for inspection from the engine control ECU 21. (Ideal value) is defined. However, instead of defining the ideal value by the control signal for inspection, the ideal value may be defined in the control program or the correction value storage program stored in the program storage area 18a of the flash memory 18.

  In that case, when the control program is executed for the first time in step S2 of FIG. 3, the motor M1 is rotated at the rotation speed as an ideal value defined in the control program or the correction value storage program. . In step S4 of FIG. 3, the difference between the actual rotation speed (actual value) of the motor M1 measured in step S3 and the rotation speed (ideal value) defined in the control program or the correction value storage program is calculated. The correction value is calculated.

  In the embodiment described above, the flash memory 18 in which the entire memory area is configured as a single erase block has been described as an example. However, a flash memory configured by partitioning the memory area into a plurality of erase blocks may be used. The present invention can be implemented. In this case, the program storage area 18a and the correction value data storage area 18b can be provided in separate erase blocks. For example, as shown in the memory area map of FIG. 4, a program storage area 18a is provided in the first erase block of the flash memory 18, the control program and the correction value storage program are stored, and the correction value data is stored in the second erase block. A storage area 18b may be provided to store correction value data.

  With this configuration, when correction value data (correction value) needs to be updated, only the second erase block provided with the correction value data storage area 18b is erased, and the program stored in the program storage area 18a is erased. Only new correction value data (correction value) can be stored again without erasing and storing again.

  In the above-described embodiment, correction value data (correction value) used for driving control of the motor M1 is obtained and stored in the flash memory 18 in which a control program used for driving control of the motor M1 of the fuel pump of the vehicle is stored. The case has been described as an example. However, the present invention can also be applied to, for example, storing unique data such as a personal identification number and owner-specific data in the mobile phone in a flash memory in which a mobile phone program is stored. In other words, the present invention can be widely applied when data specific to a device used when controlling the operation of the device by executing a program is stored in a storage medium provided in the device.

  The present invention is extremely useful when data unique to the apparatus and correction values used for controlling the operation of the apparatus by executing a program are stored in a storage medium provided in the apparatus.

DESCRIPTION OF SYMBOLS 10 Fuel pump control apparatus 11 Current detection part 12 Gate drive part 13 Lock detection part 14 Control part 15 Diag output part 16 Input I / F
17 Output I / F
18 Flash memory 18a Program storage area 18b Correction value data storage area (erase state area)
21 ECU for engine control
F1 fuse M1 motor (control target)
Q1 transistor Q2 transistor R1 shunt resistor S1 ignition switch VB battery X1 IGN relay X2 fuel pump relay

Claims (4)

A method of storing data unique to the device used when controlling the operation of a control target by executing a program stored in a flash memory mounted on the device,
In an area other than the area where the program is stored in the flash memory, an erase state area in which data can be written is secured with a capacity necessary to store the unique data. Executing the program; and
Storing the unique data generated by the operation control of the control target by the execution of the program in the erase state area by the operation of the device;
A method for storing device-specific data.   2. The device specific data according to claim 1, wherein the erase state area is secured in an erase block different from an erase block in which the program is stored among a plurality of erase blocks of the flash memory. Memory method.   The unique data is a correction value for making the measured value coincide with an ideal value related to the predetermined event, obtained from the measured value of the predetermined event at the time of operation control of the controlled object by execution of the program, In the step of storing the specific data in the erase state area, the correction value obtained from the measured value of the predetermined event by the operation control of the control target by the first execution of the program is used as the specific data. 3. The device-specific data storage method according to claim 1, wherein the device-specific data is stored in the erase state area. Used in controlling an operation of the control target in an apparatus having a flash memory in which a program is stored and a control unit that controls the operation of the control target by executing the program based on an input of an external control signal A correction value storage method unique to the apparatus,
Storing the program, leaving an area of a capacity necessary for storing the correction value in the flash memory in an erased state in which data can be written;
Allowing the control signal for inspection to be input to the device from outside the device;
The program stored in the flash memory in which an area of a capacity required to store the correction value in the control unit is left in an erased state based on the input of the control signal for inspection to the device And the stage of executing
By executing the program by the control unit based on the input of the control signal for the inspection, the operation control of the control target is performed to generate a predetermined event, and the actual measurement value specific to the apparatus regarding the predetermined event The stage of obtaining
Calculating the correction value based on the ideal value and the actual measurement value of the predetermined event defined in the program;
Storing the calculated correction value in an area left in the erase state of the flash memory;
A correction value storage method unique to the apparatus.

Images