JPH094503A - Correction data processor - Google Patents

Abstract

PURPOSE: To process the number of correction items and a correction data with a different correction position let alone correction contents in common without adding any changes to a control program itself. CONSTITUTION: In the fuel injection pump 1 for a diesel engine, its injection amount and injection timing are controlled by a pump mounting side control equipment 4 and a pump non-mounting side control equipment 5. The basic control data is stored in the ROM 17 of the control equipment 5 and the correction data peculiar to the pump 1 for this basic control data is copied from the EEPROM 6 of the control equipment 4 in a backup memory 18. In respective correction data, an item data for showing which item of their control data should be corrected is added. In a CPU 11, when a calculation is carried out based on the control data stored in the ROM 17, if an item data in coping with a concerned control data exists in the memory 18, the control data is corrected by the correction data in which the item data is added and the calculation is carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is located between, for example, a fuel injection pump of a diesel engine mounted on an automobile and an electronic control device for controlling the fuel injection pump. The present invention relates to a correction data processing device that effectively processes correction data according to the characteristics of each engine.

[0002]

As is well known, in a fuel injection pump for injecting fuel into a diesel engine, the accuracy of fuel injection is greatly influenced by the accuracy of each mechanical component forming the pump. .

Further, there are many types of engines equipped with such fuel injection pumps, and even if the characteristics of the fuel injection pumps themselves are the same, if the types of engines are different, the injection amount and injection of fuel are different. The timing also needs to be modified according to those engines.

Therefore, conventionally, for example, a ROM type memory in which correction data for absorbing variations in mechanical parts and differences in engines are stored in advance is mounted in, for example, the fuel injection pump itself, and when the pump is driven. (1) The correction data stored in the memory is transferred to the control device by an appropriate communication means. (2) The control device that has obtained the correction data controls the fuel injection by the pump by adding the correction data to the basic injection amount and injection timing by other inputs. There is proposed a technique for reducing system variation by performing correction data processing such as
-28901 gazette).

[0005]

As described above, the control information specific to the fuel injection pump or the engine is transferred to the control device as correction data, and the control device controls the drive of the pump based on the correction data. By doing so, variations in those systems will surely be reduced.

In this case, however, it is necessary that the fuel injection pump or engine and its correction data always have a one-to-one correspondence, and the control program on the side of the control unit controls which correction data is used for which control. You need to know whether the data corresponds to the item.

Therefore, normally, such correspondence is maintained by transferring correction data corresponding to a predetermined control item in a predetermined order.

However, in spite of variations in pump mechanism parts and differences in engines, generally, the number of desired correction items and correction positions are often different for each pump or each engine. In that case, the control program itself had to be changed for each pump or engine.

In recent years, the storage order (storage position) of the correction data has been intentionally changed to prevent the correction data stored in the memory from being illegally rewritten. Even in such a case, it is necessary to change the control program according to the changed storage order of the correction data.

The present invention has been made in view of such circumstances, and the correction contents as well as the correction data different in the number of the correction items and the correction positions are obtained without making any changes to the control program itself. An object of the present invention is to provide a correction data processing device that can perform common processing.

[0011]

In order to achieve such an object, in the invention described in claim 1, the first storage means storing the basic control data and the correction data for the basic control data are provided. The correction data processing device is configured to include a second storage unit that is separately stored, and a calculation unit that executes a predetermined calculation based on the data stored in the first and second storage units. 2 of the storage means, each of the correction data is the first
Item data indicating which item of the control data stored in the storage unit to be corrected is paired with the corresponding correction data, and the calculation unit stores the item data in the first storage unit. When performing a predetermined calculation based on the control data stored in the means, the second storage means is searched for the presence or absence of item data corresponding to the control data to be calculated, and if the corresponding item data exists. The control data is corrected with the correction data stored in pair with the item data, and the same operation is executed.

According to a second aspect of the invention, in the configuration of the first aspect of the invention, the first storage means is R
The second storage means is composed of a rewritable ROM.

According to the invention of claim 3, in the configuration of the invention of claim 1, the same data as the item data and the correction data stored in the second storage means are separately stored, and The third storage means is further physically separated from the second storage means, and the copy data of the item data and the correction data stored in the third storage means is transmitted via an appropriate communication means. The data is transferred and stored in the second storage means.

Further, in the invention according to claim 4, in the configuration of the invention according to claim 3, the third storage means is installed in a device to be controlled and is unique to the device. The correction data is configured to have a pair with the item data, and the second storage means is installed in a control device that controls driving of the device to be controlled, and the third storage means is provided. The item data and the correction data stored in the means are configured to be copied, and the first storage means is also mounted in the control device to control the drive of the equipment to be controlled. It is configured to have common control data which is the basic above.

According to the invention of claim 5, in the configuration of the invention of claim 4, the first storage means is R
OM, and the second storage means is a non-volatile R
It is constituted by AM, and the third storage means is constituted by a rewritable ROM.

[0016]

According to the first aspect of the present invention, the second storage means determines which item of the control data stored in the first storage means is to be corrected by each of the correction data. The item data shown is paired with the corresponding correction data. The arithmetic means, when executing a predetermined arithmetic operation based on the control data stored in the first storage means, determines whether or not there is item data corresponding to the control data to be arithmetically operated from the second storage means. If the corresponding item data is found by searching, the control data is corrected with the correction data stored as a pair with the item data, and the same operation is executed. With such a configuration, as the correction data, even when the number of correction items and the data having different correction positions are registered for each of the second storage means, the calculation means is calculated through the item data. The correction items will be recognized uniformly. Also, as the same calculating means, by having only one control program having the above-mentioned calculation structure, it becomes possible to perform common processing by the correction data for which the items are uniformly recognized.

Further, for example, the characteristics of the above-mentioned fuel injection pump and engine change with the lapse of time and aging. However, it is impossible to correct or add only a part of the correction data in the market by the conventional device that stores the correction data in the ROM type memory, and in such a case, the memory or the pump itself is not available. Had to be replaced.

In this respect, at least the second storage means is a rewritable ROM (EEP).
ROM). If such a configuration is adopted, only the correction data desired to be corrected or added together with the item data are
By overwriting the storage means, the above situation can be easily dealt with. Even in this case, the arithmetic structure (control program) of the arithmetic means includes:
There is no need to change this.

According to the invention of claim 3, the same data as the item data and the correction data stored in the second storage means are separately stored, and the second storage means A third storage means physically separated is provided, and copy data of the item data and the correction data stored in the third storage means is transferred to the second storage means via an appropriate communication means. To be done. According to such a configuration, a device equipped with the computing means and the first storage means as a general-purpose control means, and the correction data stored as a specialized control target are stored in the third device.
It becomes easy to separate from the device (equipment) in which the storage means is mounted.

Further, according to the invention as set forth in claim 4, the third storage means is mounted on a device to be controlled and has correction data unique to the device in pairs with the item data. . The second storage means is mounted on a control device that controls the drive of the device to be controlled, and the item data and the correction data stored in the third storage means are copied. The first storage means is also mounted on the control device, and has common control data that is the basis for controlling the drive of the devices to be controlled. With such a configuration, even when the same correction data processing device is applied to the above-described fuel injection pump and its control device, for example, the fuel having different characteristics can be used without making any changes to the control device itself. The injection pump and the engine can be universally controlled by only one control device.

Also in this case, at least the second storage means is composed of a non-volatile RAM, and the third storage means is a rewritable ROM (EEPRO).
M). If such a configuration is adopted, for example, even when the fuel injection pump or the engine changes over time or over time, only correction data desired to be corrected or added is overwritten on the third storage means together with the item data. By doing so, it becomes possible to easily deal with such changes in the equipment.

[0022]

FIG. 1 shows an embodiment of a correction data processing device according to the present invention. In this embodiment, the correction data processing device is embodied in a fuel injection pump of a diesel engine mounted on an automobile and its control device.

First, the overall construction of the apparatus of this embodiment will be described with reference to FIG. A diesel fuel injection pump 1 (control target) for supplying fuel to a diesel engine includes an injection amount control actuator 2 and an injection timing control actuator 3 for electronically controlling the fuel injection amount and fuel injection timing. It is provided.

Further, this diesel fuel injection pump 1
As a control device for controlling the pump, a pump-mounted control device 4 (characteristic variation storage device) mounted on the pump 1 itself and a pump-non-mounted control device 5 externally connected without being mounted on the pump 1 are used. (Control device body).

The pump-mounted control device 4 and the non-pump-mounted control device 5 are capable of synchronous serial communication, and the EEPROM 6 of the pump-mounted control device 4 is provided.
The correction data stored in (1) is transferred to the non-pump side control device 5 and stored in the backup (B / U) memory 18 of the non-pump side control device 5. Then, the non-pump side controller 5 drives and controls the actuators 2 and 3 by using the correction data.

The details will be described below. The pump-mounted control device 4 includes an EEPROM (characteristic variation storage element) 6 as a rewritable ROM-type storage element, a serial communication interface 7 and a communication buffer 8 as communication means, and a power supply capacitor 9 as charging means.
And a backflow prevention diode 10.

The EEPROM 6 stores information on the machine difference for each fuel injection pump. That is, during the shipping process of the fuel injection pump 1 from the factory, the fuel is actually injected to check the injection characteristics, and the correction data regarding the deviation from the injection characteristics of the standard pump is stored as the information of the machine difference. Has been done. The EEPROM 6 is an element that does not require a power source for holding data, but needs a power source for accessing.

As described above, the control device 4 is mounted on the diesel fuel injection pump 1, and the diesel fuel injection pump 1 is replaced so that the control unit does not need to be readjusted even if the diesel fuel injection pump 1 is replaced. It is managed integrally with the pump 1.

The non-pump mounting side control device 5 performs various calculations related to the control of the diesel fuel injection pump 1. Here, C as a control or calculation means
PU11, input signal buffer / ADC 12, power supply circuit 13, PNP transistor 14, communication buffer 1
5, an actuator drive circuit 16, a ROM 17, a backup memory 18, a RAM 21, and the like.

Of these, the power supply circuit 13 is the battery 19
Is a circuit that supplies a predetermined voltage, which is a constant voltage based on the above voltage, to each device (circuit) of the entire pump-non-installed side control device 5.

In addition, the CPU 11 controls the fuel injection through the diesel fuel injection pump 1 described later in accordance with various sensor signals fetched through the input signal buffer / ADC 12 including communication processing with the control device 4. Is the part that executes. The sensor signals that are taken in are the accelerator opening signal from the accelerator opening sensor, the engine speed signal from the engine speed sensor (crank angle sensor), the intake pressure signal from the intake pressure sensor, and the intake temperature sensor. Intake air temperature signal, a water temperature signal from an engine cooling water temperature sensor, and the like.

The ROM 17 includes a control program used by the CPU 11 and basic control data for the control program.
The matching data for each engine model (control data when there is no pump difference) and the like are stored in advance, and the RAM 21 is a memory in which the calculation results by the CPU 11 are temporarily stored.

In addition, the B / U (backup) memory 18
Is a RAM-type memory whose stored contents are always held based on power supplied from the battery 19.
8 is an EEPROM 6 of the control device 4 on the pump mounting side.
The correction data transferred from will be stored. This is to store the correction data once received by communication to minimize the frequency of communication.

The pump non-mounting side control device 5 and the pump mounting side control device 4 are connected by two signal lines L1 and L2 for communication. That is, the communication buffer 15 of the pump-uninstalled side control device 5 and the communication buffer 8 of the pump-mounted side control device 4 are connected by the serial communication line L1, and the PNP transistor 14 of the pump-uninstalled side control device 5 and the pump installed side. It is connected to the communication buffer 8 of the side control device 4 by a power supply / clock signal line L2.

In such a configuration, the CPU 11 of the non-pump side controller 5 sends a clock signal to the serial communication interface 7 via the communication buffer 15, the power supply / clock signal line L2, and the communication buffer 8.
On the other hand, the serial communication interface 7 of the pump-mounted control device 4 transfers the correction data stored in the EEPROM 6 to the CPU 11 via the communication buffer 8, the serial communication line L1, and the communication buffer 15.

Here, the power supply / clock signal line L is also provided.
2 will be described in detail. Control device 5 without pump
The power supply voltage Vcc is applied to the emitter terminal of the PNP transistor 14 and the base terminal of the PNP transistor 14 is connected to the CPU 11. Also, PN
The collector terminal of the P-transistor 14 is connected to the communication buffer 8 of the pump-mounted control device 4 via the resistor 20 and the power supply / clock signal line L2, and also connected to the power supply capacitor 9 via the backflow prevention diode 10. Has been done. In the pump-mounted control device 4, the power supply capacitor 9 is connected to the EEPROM 6 and the serial communication interface 7.

Electrically in this relationship, the CPU1
1 turns on / off the transistor 14 to supply a pulse signal having a logical L level (ground potential) and a logical H level (Vcc potential) to the pump-mounted control device 4 through the power supply / clock signal line L2. Send out.

This pulse signal is sent to the serial communication interface 7 through the communication buffer 8. This signal is a clock signal for the serial communication interface 7, and for the serial communication interface 7,
Based on this clock signal, the correction data in the EEPROM 6 is transferred to the non-pump side controller 5.

On the other hand, this power supply / clock signal line L2
The pulse signal supplied via the signal also serves as a power supply signal for the EEPROM 6 and the serial communication interface 7. That is, this pulse signal is stored (charged) in the power supply capacitor 9, and the stored power is EEPR.
It is supplied to the OM 6 and the serial communication interface 7.

In the communication idle state, the CPU 11
Turns on the transistor 14 of the non-pump side control device 5. Then, via the same transistor 14, V
A voltage of cc potential is supplied to the power supply capacitor 9 to bring the control device 4 on the pump mounting side to an active state.

On the other hand, in the communication state, the power supply capacitor 9 repeats charging and discharging due to current consumption of the entire pump-mounted control device 4. Then, after the communication is completed, the battery is charged again.

It should be noted that the pump mounting side control device 4 may be configured such that a wiring for obtaining the reference ground potential is separately provided, but in the device of the embodiment, it is directly grounded via the injection pump 1. ing.

In the non-pump side control device 5, the actuator drive circuit 16 and the injection amount control actuator 2 of the diesel fuel injection pump 1 are
The actuator drive circuit 16 is connected by the signal line 29.
The injection timing control actuator 3 and the injection timing control actuator 3 are connected by a signal line 30.

CPU 11 of non-pump-mounted control device 5
As the basic processing, as described above, performs calculation based on the matching data (data when there is no pump difference) stored in the ROM 17 for each engine model, as described above. Then, based on the calculation result, the injection amount control actuator is driven via the actuator drive circuit 16 so that the fuel injection amount and the fuel injection timing of the injection pump 1 become the required values according to the operating state of the engine. The signal SG1 and the injection timing control actuator drive signal SG2 are output. Injection amount control actuator 2 and injection timing control actuator 3
The drive amount or drive timing is controlled according to the drive signals SG1 and SG2.

As described above, the diesel fuel injection pump 1 has characteristic variations among individuals due to machining accuracy or assembly accuracy. For this reason,
Even if the same drive signal is output in the same engine operating condition,
The actual fuel injection amount and fuel injection timing vary depending on such a difference in the fuel injection pump 1.

Therefore, in the apparatus of the present embodiment, such correction of characteristics is finely corrected by using the correction data of the EEPROM 6 transferred and copied to the backup memory 18, and the fuel injection amount and fuel injection timing as close to the required value as possible are finely corrected. Is being obtained.

Hereinafter, the correction data processing mode by the apparatus of the embodiment will be described in more detail with reference to FIGS. First, FIG. 2 illustrates a memory structure of the EEPROM 6 in which the correction data is stored in advance.

As shown in FIG. 2, the EEPROM
6 shows the correction data and item data indicating which item of the basic control data stored in the ROM 17 is to be corrected.
Each is stored as a pair. At the end of the data, the item data “FFH
(Hexadecimal number) ”(reference numeral 631) and its correction data“ FF
H ”(reference numeral 632), and thereafter, as a spare area for rewriting or adding data, the state where no data is contained (“ FFH ”) is maintained. When correction data is added later, the item data is overwritten on the address of reference numeral 631 and the correction data is changed to reference numeral 632.
Will be overwritten on the address. After that, the data “FFH” at the addresses 633 and 634 become item data and correction data indicating the end of the data, respectively.

The item data is stored in the EEPROM 6 as data having the format shown in FIG. That is, here, it is assumed that both the item data and the correction data are made up of 1 byte (8 bits). Particularly, for the item data, as shown in FIG. It is assigned to the item bit to represent.

In the apparatus of this embodiment, the major correction items are the "base injection angle" shown in FIG.
Alternatively, there is a “base injection amount” shown in FIG. Then, here, 2-bit data "01" is assigned to the "base injection angle", and 2-bit data "10" is assigned to the "base injection amount". As for the 2-bit data “11”, this is assigned to the “other” correction item as shown in FIG.

Further, the remaining 6 bits of the item data consisting of the same 1 byte, as shown in FIGS. 3 (b) and 3 (c), use the respective 3 bits to obtain the "Q (ejection amount) address". , "ACCP (accelerator opening) address" and "NE (rotation speed) address". These addresses indicate respective map points in a base injection angle map or a base injection amount map, which will be described later, stored in the ROM 17.

With such a data format as the item data, the item data "injection angle correction, Q = 1st, NE = 1st" at the address 611 illustrated in FIG. 2 becomes "(0, 1), ( 0,0,1), (0,0,1) ", which is 1-byte data, and the reference numeral 62
The item data “Injection amount correction, ACCP = 5th, NE = 6th” at the address of No. 3 is 1 in the configuration such as “(1,0), (1,0,1), (1,1,0)”. It becomes byte data.

On the other hand, R of the non-pump side control device 5
In the mode illustrated in FIG. 5, the OM 17 stores a base injection angle map and a base injection amount map corresponding to the engine. In addition, in FIG. 5, for convenience,
Of these maps, only the base injection angle map is shown, but the other base injection amount map also conforms to this base injection angle map except that the accelerator opening ACCP is used instead of the injection amount Q. Has become.

Incidentally, in the base injection angle map illustrated in FIG. 5, the engine speed NE is plotted along the horizontal axis.
And the fuel injection amount Q in the vertical axis direction, and the control data of the base injection angle to be set corresponding to these rotational speed NE and injection amount Q are, for example, "H", "H1", "H".
2 ”..., etc., which are registered in advance at each map point of the same map. In the same map, the rotational speed NE is 400 rpm to 3 with 400 rpm as an offset.
Corresponding to the rotation speed of 200 rpm, eight map points 0 to 7 at 400 rpm intervals are set, and the other injection amount Q is 0 mm ^ 3 ("^" represents a power) to 100 m.
Six map points 0 to 5 are set at intervals of 20 mm ^ 3 corresponding to the injection amount of m ^ 3. Each control data corresponding to these map points is actually stored in the ROM 17 with the storage structure shown in FIG.

Further, in the apparatus of the embodiment, in order to interpolate the data at each map point, the rotation speed NE is set.
For, the 1-byte interpolation coefficient for which the LSB is “400 rpm / 256” is prepared, and for the injection amount Q, the same 1-byte interpolation coefficient for which the LSB is “20 mm ^ 3/256” is prepared. . Each of these interpolation coefficients is calculated in accordance with the information of the rotational speed NE that is taken into the CPU 11 each time, and the information of the injection amount Q that is separately map-calculated based on the rotational speed NE and the accelerator opening ACCP.
It is temporarily stored in each of the A'register and the C'register built in the PU 11. At this time, a 1-byte base value corresponding to the map point for the rotational speed NE is temporarily stored in the A register in the CPU 11, and the C register also stores the base point value for the injection amount Q in the map point. The corresponding 1-byte base value is temporarily stored.

FIG. 4 schematically shows the structures of these A, A'registers and C, C'registers.
For example, for a value such as the rotation speed NE = 1000 rpm, the base value 800 rpm is stored in the A register as “0,0,0,0,0,0,1,0” as illustrated in FIG. , And the interpolation coefficient of 200 rpm is temporarily stored in one of the A ′ registers in the form of “1, 0, 0, 0, 0, 0, 0, 0”. For a value such as the injection amount Q = 30 mm ^ 3, the base value is 20 mm ^ 3 in the C register, as shown in FIG. 4 (b).
Is temporarily stored in the form of "0,0,0,0,0,0,0,1", and the interpolation coefficient 10mm ^ 3 is stored in one of the C'registers as "1,0,0,0, It is temporarily stored in the form of "0,0,0,0".

FIG. 7, FIG. 8 and FIG. 9 respectively show processing procedures for the correction data communication processing and the injection amount calculation processing on the premise of such a structure as the correction data processing apparatus of the embodiment. is there.

First, referring to FIG. 7, a correction data communication process by the apparatus of the embodiment will be described. In this correction data communication process, the CPU 11 firstly, in step S101, the backup (B / U) memory 18
Check whether the check code in is normal. For this check, for example, a well-known sum check or the like is used.
Here, when it is determined that the check code is normal, the processing relating to the correction data communication is ended as it is.

On the other hand, when it is determined in step S101 that there is no check code or the check code is abnormal, the CPU 11 causes the EEPROM
In order to receive the stored data from S6, step S102
Outputs a clock signal to the power supply / clock signal line L2. As described above, the control device 4 sequentially transmits the stored data from the head address of the EEPROM 6 based on this clock signal via the serial communication line L1.

In the CPU 11, steps S103 to S1
At 05, the transmitted data is sequentially received and backed up (B / B) until the end of the data is detected.
U) Sequentially store in the memory 18. Whether or not the data has ended is determined by whether or not the item data and the correction data are "FFH" as shown in FIG.

After that, when the CPU 11 determines in step S104 that the data has ended, the CPU 11 stops the output of the clock signal in step S106 and ends the communication.
Then, in the next step S107, the data read in the backup (B / U) memory 18 is checked, the check code is written in the memory 18, and then the process ends.

By performing such correction data communication processing, the backup (B /
U) A pair of correction data and its item data is registered and held in the memory 18 in a manner similar to that shown in FIG.

Next, with reference to FIGS. 8 and 9, a process for calculating the injection amount by the apparatus of the embodiment based on the data registered and held in the backup (B / U) memory 18 will be described. . However, here, the calculation procedure will be described for a case where the base injection angle is obtained by two-dimensional map interpolation using the rotational speed NE and the injection amount Q illustrated in FIG.

In the base injection angle calculation routine, the CPU 11 firstly proceeds to step S201.
The map points (base values) of the rotational speed NE and the interpolation coefficients obtained at that time are loaded into the A and A'registers, respectively. In step S202, similarly, the map point (base value) of the injection amount Q and its interpolation coefficient are loaded into the C and C ′ registers, respectively.

The CPU 11 having thus loaded the corresponding values in the A, A'registers and the C, C'registers, next,
In step S203, (Q map point × number of NE data) + NE map point is obtained as the address of map data to be interpolated, and this is stored in the built-in Y register. And
The data of the address stored in this Y register is stored in the ROM 1
7 is read out, and this is used as data WR1 in RAM 21
To be stored.

For example, these A, A'registers and C,
Rotational speed NE and injection amount Q loaded in the C'register
Are the values illustrated in FIG. 4, that is, NE = 1.
Assuming that 000 rpm and Q = 30 mm ^ 3, as is apparent from FIG. 5, NE map points = 1 Q map points = 1 NE data count (number of NE map points) = 8, and Y register The address of the stored map data is “9”. Then, in the ROM 17, the data at the address "9" becomes "H", as is clear from FIG. Therefore, the above data WR
For example, this data “H” is stored in the RAM 21.

When the data WR1 is specified in this way, CP
U11 then, in step S204,
Here, for example, it is checked based on the item data whether correction data for NE = 1 and Q = 1 exists in the backup (B / U) memory 18. If the correction data for the map point exists, step S2
At 05, the data WR1 is updated as WR1 ← WR1 + correction data, and the process proceeds to the next step S206.
If the correction data for the same map point does not exist, the process directly proceeds to the process of step S206.

Incidentally, in the case of the example here, "(0,1), (0,0,1), (0,0) corresponding to the contents of" injection angle correction, Q = 1st, NE = 1st " , 1) ”is searched for, and in the example of FIG. 2, the item data at the address of 611 corresponds to this. In this case, the data of the next address 612 is the correction data.
The data is read from the backup (B / U) memory 18. That is, in the case of the example here, the above step S
At 205, an update process of the data WR1 based on this correction data is executed.

Continuing the description based on this example, in step S206, the data "H" next to the data "H" is next.
In order to read "1", 1 is added to the address value "9" of the Y register. Then, the data “H1” stored in the address “10” obtained by adding 1 is replaced with the data W
It is stored in the RAM 21 as R2.

CPU 1 which has thus specified data WR2
In step S207, 1 is the map point, that is, NE = 2 (1 + 1), Q, as in step S204.
Correction data for = 1 is the above backup (B / U)
Whether or not it exists in the memory 18 is inspected based on the item data. If the correction data for the map point exists, the data WR2 is calculated in step S208.
Is updated as WR2 ← WR2 + correction data, and the process proceeds to the next step S209.
If there is no correction data for the same map point, the process directly proceeds to the process of step S209.

In step S209, the data WR1 ("H '") and the data WR stored in the RAM 21 are stored.
2 (“H1”) and the interpolation coefficient of the rotational speed NE stored in the A ′ register, an interpolation calculation such as WR1 + (WR2-WR1) × A ′ is executed, and the result is calculated as data WR3.
Is stored in the RAM 21 as

Similarly, in steps S210 to S216 of FIG. 9, the control data "H2" stored in the address "17" of the ROM 17 and the address "1" are stored.
8 ”, the interpolation calculation is executed for the control data“ H3 ”, and the result is RA as data WR4.
Store in M21.

Note that the processing of these steps S210 to S216 is the same as the above-mentioned steps S203 to S203 of FIG.
The processing is executed in a manner similar to the processing of step S209, and redundant description of those processings will be omitted.

Now, the CPU 11 having completed the interpolation calculation for the rotational speed NE in the end, finally, in step S217, the interpolation data WR3 and WR4 obtained above and the above C '.
By the interpolation coefficient of the injection amount Q stored in the register, an interpolation calculation is performed in consideration of the injection amount Q such as WR3 + (WR4-WR3) × C ', and the desired "base injection angle" is obtained. calculate.

Here, for the sake of convenience, the calculation procedure is shown for the case where the "base injection angle" is obtained by two-dimensional map interpolation using the rotational speed NE and the injection amount Q.
It goes without saying that the “base injection amount” is also calculated by the procedure according to the above based on the two-dimensional map based on the rotational speed NE and the accelerator opening degree ACCP (not shown).

As described above, the backup (B / U) memory 18 of the correction data processing device of the embodiment is basically the control data in which each correction data of the fuel injection pump 1 is stored in the ROM 17. Item data indicating which item is to be corrected is paired with the corresponding correction data. When executing a predetermined calculation based on the control data stored in the ROM 17, the CPU 11 searches the backup memory 18 for the presence or absence of item data corresponding to the control data to be calculated, and the corresponding item data is If it exists, the control data is corrected with the correction data registered as a pair with the item data, and the same calculation is executed. According to such a configuration, regardless of the correction content, as well as any data having different correction items or different correction positions, the correction data is uniformly stored in the CPU 11 through the item data. Will be recognized by. Also, the CPU 11 also has only one control program having the above-described arithmetic structure, and thus it is possible to perform common processing by the correction data for which items are uniformly recognized.

Further, according to the above-mentioned configuration of the apparatus of the embodiment, correction data (including item data) for the EEPROM 6 in the control device 4 can be easily corrected or added, and the characteristics of the fuel injection pump 1 and the engine can be improved over time. Even if it changes due to aging or the like, it becomes possible to easily deal with this.

In the apparatus of the embodiment, as an example, the correction data and the item data thereof are both composed of 1-byte data, but the number of bytes or the number of bits of these data is arbitrary.

Further, in the apparatus of the same embodiment, no provision is made for the data structure of the correction data. Therefore, depending on the content of the correction data, the discrimination from the item data may be ambiguous. Therefore, in the case where the item data represents the large item in the upper 2 bits as in the format illustrated in FIG. 3, the upper 2 bits of the correction data are set to, for example, “0,0”.
It is also effective to adopt a data structure that is not possible in item data, such as fixing to. According to such a data structure as the correction data, this will not be erroneously recognized as the item data.

Further, in the apparatus of the embodiment, the EEPROM 6 is arranged on the side of the control device 4 and the copied data is stored in the control device 5.
It is assumed that the data is transferred to the backup memory 18 on the side. However, the configuration is not necessarily limited to this and, for example, the EE connected to the control device 5 side by the CPU 11 via the internal bus.
A configuration including a PROM can also be used. Incidentally, in this case, the control device 4 becomes unnecessary, and the backup memory 18 on the control device 5 side is also eliminated.

Further, in the embodiment, the case where the correction data processing device of the present invention is embodied in a fuel injection pump of a diesel engine mounted on an automobile and its control device is shown, but the application target thereof is also arbitrary. Is. That is, the target to which the same correction data processing device is applied is a system in which, with respect to the basic control data, the correction data in which the number of correction items and the correction position are different for each device to be controlled may be used. If Even in such a system, by applying the configuration according to the above-described embodiment as the correction data processing device, the common processing of the correction data without the need to change the control program is preferably realized.

[0082]

As described above, according to the present invention, various kinds of correction data having different number of correction items and different correction positions can be commonly used without changing the control program itself. You will be able to process.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a correction data processing device of the present invention.

FIG. 2 is a schematic view showing an example of a storage structure of correction data and item data of the same embodiment.

FIG. 3 is a schematic diagram showing a data format example of the item data.

FIG. 4 is a schematic diagram showing the structure of A, A ′ registers and C, C ′ registers.

FIG. 5 is a schematic diagram showing a base injection angle map as an example of basic control data.

FIG. 6 is a schematic diagram showing an example of a storage structure in a ROM of the base injection angle map.

FIG. 7 is a flowchart showing a correction data communication procedure according to the embodiment.

FIG. 8 is a flowchart showing an example of a fuel injection amount calculation procedure according to the embodiment.

FIG. 9 is a flowchart showing an example of a fuel injection amount calculation procedure according to the embodiment.

[Explanation of symbols]

1 ... Diesel fuel injection pump, 2, 3 ... Actuator, 4 ... Pump mounting side control device, 5 ... Pump non-mounting side control device, 6 ... EEPROM, 7 ... Serial communication interface, 8 ... Communication buffer, 9 ... Power supply Capacitor, 10 ... Backflow prevention diode, 11 ... CPU, 12 ...
Input signal buffer / ADC, 13 ... Power supply circuit, 14 ... P
NP transistor, 15 ... Communication buffer, 16 ... Actuator drive circuit, 17 ... ROM, 18 ... Backup (B / U) memory, 19 ... Battery, 20 ... Resistor, 21
... RAM, 29, 30 ... Signal line, L1 ... Serial communication line, L2 ... Power supply / clock signal line.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kengo Sugiura 1-1-1, Showa-cho, Kariya city, Aichi prefecture Nihon Denso Co., Ltd.

Claims (5)

[Claims] 1. A first storage means in which basic control data is stored, a second storage means in which correction data for the basic control data is separately stored, and the first and second storage means. Computing means for performing a predetermined computation based on the data stored in the means, wherein the second storage means stores any of the items of the control data in which each of the correction data is stored in the first storage means. The item to be corrected is paired with the corresponding correction data, and the calculation means performs the predetermined calculation based on the control data stored in the first storage means. The presence or absence of item data corresponding to the control data is searched from the second storage means, and if the corresponding item data exists, the control is performed using the correction data stored in pair with the item data. A correction data processing device characterized by performing data correction and performing the same calculation. 2. The first storage means is a ROM, and the second storage means is a rewritable ROM.
The correction data processing device described. 3. The correction data processing apparatus according to claim 1, wherein the same data as the item data and the correction data stored in the second storage means are separately stored and the second storage data is stored.
Third storage means physically separated from the second storage means, and the copy data of the item data and the correction data stored in the third storage means is transferred to the second storage means via an appropriate communication means. A correction data processing device, which is transferred and stored in a storage means. 4. The third storage means is installed in a device to be controlled, and has correction data unique to the device and the item data, respectively, and the second storage means includes the control data. It is mounted on a control device for controlling the drive of a target device, and the item data and the correction data stored in the third storage means are copied, and the first storage means also controls Mounted on the device,
4. The correction data processing device according to claim 3, wherein the correction data processing device has common control data as a basis for controlling the drive of the devices to be controlled. 5. The correction data process according to claim 4, wherein the first storage means is a ROM, the second storage means is a non-volatile RAM, and the third storage means is a rewritable ROM. apparatus.