JP2865023B2 - Correction data processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection pump, for example, between a fuel injection pump of a diesel engine mounted on an automobile and an electronic control unit for controlling the same. The present invention relates to a correction data processing device that performs effective processing of correction data in accordance with the characteristics of each engine.

[0002]

2. Description of the Related Art As is well known, in a fuel injection pump for injecting fuel into a diesel engine, the accuracy of the fuel injection greatly depends on the accuracy of each mechanical component constituting the pump. .

There are many types of engines equipped with such fuel injection pumps. Even if the characteristics of the fuel injection pumps themselves are the same, if the types of engines are different, the amount of injected fuel or the amount of injected fuel will differ. The timing also needs to be adjusted for those engines.

Therefore, conventionally, a ROM-type memory in which correction data for absorbing such variations in mechanical parts and differences between engines is stored in advance in a fuel injection pump itself, for example, when the pump is driven. (1) Transfer the correction data stored in the memory 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 in consideration of the correction data in addition to the basic injection amount and injection timing based on other inputs. A technique has been proposed to reduce the variation in the system by performing correction data processing such as
-28901).

[0005]

As described above, control information unique to the fuel injection pump or the engine is transferred to the control device as correction data, and the control device controls the operation of the pump based on the correction data. By doing so, the variability of 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 correspond one-to-one, and the control program on the control device side also determines which control data the correction data You need to know if the data corresponds to the item.

[0007] For this reason, normally, such correspondence is maintained by transferring correction data corresponding to a predetermined control item in a predetermined order.

[0008] However, in spite of variations in pump mechanism parts and differences in engines, the number of desired correction items and correction positions generally differ from pump to pump or engine in many cases. In such a case, the control program itself needs to be changed for each of the pumps and engines.

In recent years, in order to prevent unauthorized rewriting of the correction data stored in the memory, the storage order (storage position) of the correction data has been intentionally changed. 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 does not make any change to the control program itself, and can use not only correction contents but also correction data having different numbers of correction items and correction positions. It is an object of the present invention to provide a correction data processing device capable of performing common processing.

[0011]

In order to achieve the above object, according to the first aspect of the present invention, first storage means for storing basic control data and correction data for the basic control data are stored in a memory. The correction data processing apparatus comprises a second storage unit separately stored, and a calculation unit for performing a predetermined calculation based on the data stored in the first and second storage units. 2 is stored in the storage means, and each of the correction data is stored in the first storage means.
Item data indicating which item of the control data stored in the storage means is to be corrected is paired with the corresponding correction data. When performing a predetermined operation based on the control data stored in the means, the presence or absence of item data corresponding to the control data to be operated is searched from the second storage means, and if the corresponding item data exists, , The control data is corrected by the correction data stored as a pair with the item data, and the same operation is performed.

According to a second aspect of the present invention, in the configuration of the first aspect of the present invention, the first storage means includes an R
The second storage means is constituted by a rewritable ROM.

According to a third aspect of the present invention, in the configuration of the first aspect of the present invention, the same data as the item data and the correction data stored in the second storage means are separately stored, The apparatus further comprises a third storage means physically separated from the second storage means, and the item data and the copy data of the correction data stored in the third storage means are transmitted via an appropriate communication means. The data is transferred and stored in the second storage means.

According to a fourth aspect of the present invention, in the configuration of the third aspect of the present invention, the third storage means is mounted on a device to be controlled, and has a unique The correction data is configured to have a pair with the item data, and the second storage means is mounted on a control device that controls the drive of the device to be controlled, and is stored in the third storage means. The item data and the correction data stored in the means are configured to be copied, and the first storage means is similarly mounted on a control device and controls the driving of the devices to be controlled. It is configured as having the basic common control data above.

According to a fifth aspect of the present invention, in the configuration of the fourth aspect of the present invention, the first storage means includes an R
OM, and the second storage means is a non-volatile R
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 each of the correction data corrects in the control data stored in the first storage means. Item data shown is paired with the corresponding correction data. When performing a predetermined calculation based on the control data stored in the first storage means, the calculation means determines from the second storage means whether there is item data corresponding to the control data to be calculated. The search is performed, and if the corresponding item data exists, the control data is corrected using the correction data stored in pairs with the item data, and the same operation is performed. According to such a configuration, as the correction data, even if data of different numbers of correction items and different correction positions are registered, as well as correction contents, for each of the second storage means, the calculation means is provided through the item data. , The correction items are uniformly recognized. By having only one control program having the above-described arithmetic structure, the arithmetic means can perform common processing using the correction data that is uniformly recognized as an item.

Also, for example, the characteristics of the above-described fuel injection pump and engine change with time, aging, and the like. However, in the conventional apparatus that stores correction data in a ROM-type memory, it is impossible to correct or add only a part of correction data in the market. In such a case, the memory or the pump itself is not used. Had to be replaced.

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

According to the present invention, the same data as the item data and the correction data stored in the second storage means are separately stored. A third storage unit physically separated from the second storage unit, and the item data and the copy data of the correction data stored in the third storage unit are transferred to the second storage unit via an appropriate communication unit. Is done. According to such a configuration, the device in which the arithmetic unit and the first storage unit are mounted as general-purpose control units, and the third control unit in which the correction data is stored as a specialized control target are stored.
And the device (equipment) on which the storage means is mounted can be easily separated.

Further, according to the invention of 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 unit is mounted on a control device that controls the driving of the device to be controlled, and the item data and the correction data stored in the third storage unit are copied. The first storage means is also mounted on the control device, and has common control data which is basic for controlling the driving of the devices to be controlled. According to such a configuration, even when the correction data processing device is applied to, for example, the above-described fuel injection pump and its control device, the fuel having different characteristics can be obtained without making any change to the control device itself. The injection pump and the engine can be generally controlled by only one control device.

Also in this case, at least the second storage means comprises a non-volatile RAM, and the third storage means comprises a rewritable ROM (EEPRO).
M). If such a configuration is adopted, for example, when the fuel injection pump or the engine undergoes aging or aging, only the correction data desired to be corrected or added together with the item data is overwritten in the third storage means. By doing so, it is possible to easily cope with such a change in the device.

[0022]

FIG. 1 shows an embodiment of a correction data processing apparatus 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 configuration of the entire apparatus according to this embodiment will be described with reference to FIG. A diesel fuel injection pump 1 (control object) 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. Is provided.

The diesel fuel injection pump 1
Control devices 4 (a characteristic variation storage device) mounted on the pump 1 itself, and a non-pump mounted control device 5 that is externally connected without being mounted on the pump 1 (Control device body).

The control device 4 on the pump side and the control device 5 on the non-pump side can perform synchronous serial communication, and the EEPROM 6 of the control device 4 on the pump side.
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. The non-pump mounted control device 5 controls the driving of the actuators 2 and 3 using the correction data.

Hereinafter, the details will be described. 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 machine differences 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 relating to the deviation from the injection characteristics of the standard pump is stored as the information of the machine difference. Have been. The EEPROM 6 is an element that does not require a power supply for holding data, but requires a power supply for access.

As described above, the control device 4 is mounted on the diesel fuel injection pump 1 and the diesel fuel injection pump 1 is not required to be re-adjusted even if the diesel fuel injection pump 1 is replaced. It is managed integrally with the pump 1.

The non-pump control device 5 performs various calculations relating to the control of the diesel fuel injection pump 1. Here, C as control or calculation means
PU11, input signal buffer / ADC12, 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.

The power supply circuit 13 includes a battery 19
Is a circuit that supplies a predetermined voltage obtained by converting the voltage into a constant voltage based on the voltage of the control device 5 to all devices (circuits) of the non-pump-mounted control device 5.

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

The ROM 17 stores a control program used by the CPU 11 and its basic control data as basic control data.
The RAM 21 is a memory in which adaptation data for each engine model (control data when there is no difference between pumps) and the like are stored in advance, and the RAM 21 is a memory for temporarily storing a calculation result by the CPU 11 and the like.

The B / U (backup) memory 18
Is a RAM type memory in which the stored contents are always held based on the power supply from the battery 19.
8 includes an EEPROM 6 of the pump-mounted control device 4.
The correction data transferred from is stored. This is for storing the correction data once received in the communication and minimizing the frequency of the communication.

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

In such a configuration, the CPU 11 of the non-pump-mounted control device 5 sends a clock signal to the serial communication interface 7 via the communication buffer 15, the power supply / clock signal line L 2, 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 and clock signal line L
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 is also connected to the power supply capacitor 9 via the backflow prevention diode 10. Have been. In the pump-mounted control device 4, the power supply capacitor 9 is connected to the EEPROM 6 and the serial communication interface 7.

In such an electrical relationship, the CPU 1
1 turns on / off the transistor 14 to supply a pulse signal composed of 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
Based on this clock signal, the correction data in the EEPROM 6 is transferred to the non-pump control device 5.

On the other hand, the power supply and clock signal line L2
Are supplied to the EEPROM 6 and the serial communication interface 7 as power supply signals. That is, this pulse signal is stored (charged) in the power supply capacitor 9, and the stored power is used as the 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 control device 5 without the pump. Then, through the transistor 14, V
The voltage of the cc potential is supplied to the power supply capacitor 9 to bring the pump mounted control device 4 into 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.

In the pump-mounted control device 4, a wiring for obtaining a reference ground potential may be separately provided. However, in the device of this embodiment, the wiring is directly grounded via the injection pump 1. ing.

In the non-pump mounted 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 a signal line 29.
The injection timing control actuator 3 is connected to the injection timing control actuator 3 by a signal line 30.

The CPU 11 of the control device 5 without the pump
Performs the calculation based on the adaptation data (data when there is no difference between pumps) for each engine model stored in the ROM 17 according to the various sensor signals, as described above, as its basic processing. Then, based on the calculation result, the actuator drive circuit for controlling the injection amount is controlled via the actuator drive circuit 16 so that the fuel injection amount and the fuel injection timing of the injection pump 1 become values required according to the operating state of the engine. A signal SG1 and an 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 of the is controlled according to the drive signals SG1 and SG2.

Note that, as described above, the diesel fuel injection pump 1 has characteristic variations among individuals due to machining accuracy, assembly accuracy, and the like. For this reason,
Even if the same drive signal is output while the same engine is running,
The actual fuel injection amount and the fuel injection timing vary according to the machine difference of the fuel injection pump 1.

Therefore, in the apparatus according to the embodiment, correction is performed using the correction data of the EEPROM 6 transferred and copied to the backup memory 18 to finely correct such characteristic variations, and the fuel injection amount and fuel injection timing as close as possible to the required values are obtained. Is to be obtained.

Hereinafter, such correction data processing by the apparatus of this embodiment will be described in further 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.
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, item data “FFH” indicating the end of the data is set.
(Hexadecimal) "(reference numeral 631) and its correction data" FF
H "(reference numeral 632), and thereafter, as a spare area for rewriting or adding data, a state where no data is contained (" FFH ") is maintained. When the correction data is added later, the item data is overwritten on the address 631, and the correction data is added to the address 632.
Address is overwritten. After that, the data “FFH” at the addresses 633 and 634 becomes the item data and the 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 composed of 1 byte (8 bits). In particular, as for the item data, as shown in FIG. Assigned to the item bit to represent.

In the apparatus of this embodiment, the large correction items include “base injection angle” shown in FIG.
Alternatively, there is a “base injection amount” shown in FIG. Here, 2-bit data “01” is assigned to “base injection angle”, and 2-bit data “10” is assigned to “base injection amount”. Further, as shown in FIG. 3D, the 2-bit data “11” is allocated to “other” correction items.

As shown in FIGS. 3 (b) and 3 (c), the remaining 6 bits of the 1-byte item data use the 3 bits to form a "Q (injection amount) address". , “ACCP (accelerator opening) address” and “NE (rotational speed) address”. These addresses indicate respective map points in a base injection angle map or a base injection amount map described later stored in the ROM 17.

According to such a data format as the item data, the item data “injection angle correction, Q = 1st, NE = 1st” at, for example, the address 611 illustrated in FIG. 2 becomes “(0, 1), ( 0, 0, 1), (0, 0, 1) ”.
The item data “injection amount correction, ACCP = fifth, NE = sixth” of the address 3 is “1 (1,0), (1,0,1), (1,1,0)”. It becomes byte data.

On the other hand, the R
The OM 17 stores a base injection angle map and a base injection amount map corresponding to the engine in the mode illustrated in FIG. In FIG. 5, for convenience,
Of these maps, only the base injection angle map is shown, but the other base injection amount map is based on this base injection angle map, except that the accelerator opening ACCP is used instead of the injection amount Q. It has become.

Incidentally, in the base injection angle map exemplified in FIG. 5, the engine speed NE is indicated in the horizontal axis direction.
And the fuel injection amount Q in the vertical axis direction. The control data of the base injection angle to be set corresponding to the rotational speed NE and the injection amount Q is, for example, “H”, “H1”, “H”.
2 "... Are registered in advance at each map point of the map. In the same map, the rotational speed NE is set at 400 rpm to 3 with 400 rpm as an offset.
Eight map points 0 to 7 are set in increments of 400 rpm corresponding to the rotation speed of 200 rpm, and the other injection amount Q is 0 mm ^ 3 ("^" represents a power) to 100 m.
Six map points 0 to 5 are set in increments 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.
, A 1-byte interpolation coefficient whose LSB is "400 rpm / 256" is prepared, and an injection coefficient Q is a 1-byte interpolation coefficient whose LSB is "20 mm ^ 3/256". . Each of these interpolation coefficients is calculated according to the information on the rotational speed NE taken into the CPU 11 each time, and the information on the injection amount Q separately mapped based on the rotational speed NE and the accelerator opening ACCP.
They are temporarily stored in the A 'register and the C' register built in the PU 11, respectively. At this time, a 1-byte base value corresponding to the map point for the rotation speed NE is temporarily stored in the A register in the CPU 11, and the C register is stored in the C register for the map point for the injection amount Q. The corresponding one-byte base value is temporarily stored.

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

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

First, with reference to FIG. 7, a description will be given of a correction data communication process by the apparatus of the embodiment. In the correction data communication processing, the CPU 11 firstly sets the backup (B / U) memory 18 in step S101.
It checks whether the check code in is normal. For this check, for example, a well-known sum check is used.
Here, when it is determined that the check code is normal, the processing relating to the correction data communication is terminated as it is.

On the other hand, if it is determined in step S101 that there is no check code or that the check code is abnormal, the CPU 11
Step S102 to receive the stored data from
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 via the serial communication line L1 based on the clock signal.

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

After that, when judging the end of the data in step S104, the CPU 11 stops outputting the clock signal in step S106, and ends the communication.
Then, in the next step S107, the data read into the backup (B / U) memory 18 is checked, the check code is written into the memory 18, and the process is terminated.

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

Next, with reference to FIG. 8 and FIG. 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 for the case where the base injection angle is obtained by two-dimensional map interpolation using the rotation speed NE and the injection amount Q illustrated in FIG. 5 will be described.

In the routine for calculating the base injection angle, the CPU 11 first determines in step S201
The map points (base values) of the rotational speed NE obtained at that time and the interpolation coefficients thereof are loaded into the A and A 'registers, respectively. In step S202, a 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 loaded the corresponding values into the A and A 'registers and the C and C' registers, respectively,
In step S203, (map point of Q × number of NE data) + NE map point is obtained as an address of map data to be interpolated, and this is stored in a built-in Y register. And
The data of the address stored in the Y register is stored in ROM1.
7 is read from the RAM 21 as data WR1.
To be stored.

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

When data WR1 is specified in this way, CP
U11 next, in step S204, the above map point,
Here, for example, it is checked whether or not correction data for NE = 1 and Q = 1 exists in the backup (B / U) memory 18 based on the item data. Then, if there is correction data for the map point, step S2
At 05, the data WR1 is updated as WR1 ← WR1 + correction data, and the process proceeds to the next step S206.
If there is no correction data for the map point, the process directly proceeds to the process in step S206.

By the way, 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) ", and in the example of FIG. 2, the item data at the address 611 corresponds to this. In this case, the data at the next address 612 is the correction data as 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, a process of updating the data WR1 based on the correction data is performed.

In the following, the description will be continued based on the same example. In step S206, the next data "H"
In order to read “1”, 1 is added to the address value “9” of the Y register. The data “H1” stored at the address “10” obtained by adding 1 to the data W
It is stored in the RAM 21 as R2.

The CPU 1 which has specified the data WR2
1 is the map point, ie, NE = 2 (1 + 1), Q in step S207, as in step S204.
= 1 is the backup data (B / U)
It is checked whether it exists in the memory 18 based on the item data. Then, if there is correction data for the map point, in step S208, the data WR2
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 in step S209.

In step S209, data WR1 ("H '") and data WR stored in 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 converted into the data WR3.
Is stored in the RAM 21.

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

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

The CPU 11 that has completed the interpolation calculation for the rotational speed NE in this manner finally, at step S217, interpolates the above-obtained interpolation data WR3 and WR4 with the previous C '.
An interpolation calculation is performed in consideration of the injection amount Q such as WR3 + (WR4−WR3) × C ′ based on the interpolation coefficient of the injection amount Q stored in the register to obtain the desired “base injection angle”. calculate.

Here, for the sake of convenience, the calculation procedure has been described 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.
Needless to say, the “base injection amount” is also calculated based on a two-dimensional map of the rotational speed NE and the accelerator opening ACCP, which are not shown, according to the above-described procedure.

As described above, basically, the backup (B / U) memory 18 of the correction data processing device of this embodiment stores the correction data of the fuel injection pump 1 in the control data 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 operation 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 operated, and the corresponding item data is If there is, the control data is corrected by the correction data registered as a pair with the item data, and the same operation is executed. According to such a configuration, even if any data having a different number of correction items or different correction positions is registered as the correction data as well as the correction content, the correction items are uniformly transmitted to the CPU 11 through the item data. Will be recognized. By having only one control program having the above-described arithmetic structure, the CPU 11 can perform common processing using the correction data that is uniformly recognized as the item.

Further, according to the above configuration of the device of the embodiment, it is easy to correct or add correction data (including item data) to the EEPROM 6 in the control device 4, and the characteristics of the fuel injection pump 1 and the engine are changed with time. , It can be easily dealt with even if it changes due to aging or the like.

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

Further, in the apparatus of this 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, if the item data represents the large item by the upper two bits as in the format illustrated in FIG. 3, for example, the upper two bits of the correction data are, for example, “0, 0”.
It is also effective to adopt a data configuration that cannot be included in the item data, such as fixing to the item data. According to such a data configuration as the correction data, this is not erroneously recognized as the item data.

In the apparatus of this embodiment, an EEPROM 6 is provided on the control device 4 side, and the copied data is transferred to the control device 5.
It is transferred to the backup memory 18 on the side. However, the configuration is not limited to such a configuration. For example, an EE connected to the CPU 11 via an internal bus may be provided on the control device 5 side.
A configuration including a PROM may be employed. In this case, the control device 4 becomes unnecessary, and the backup memory 18 on the control device 5 side is also eliminated.

In this embodiment, the correction data processing device of the present invention is embodied as a fuel injection pump for a diesel engine mounted on an automobile and its control device. It is. In other words, the target to which the correction data processing device is applied is a system in which correction data having different numbers of correction items and correction positions for each device to be controlled may be used for the basic control data. Should be fine. Even in such a system, common processing of the correction data without changing the control program is suitably realized by applying the configuration according to the above-described embodiment as the correction data processing device.

[0082]

As described above, according to the present invention, without changing the control program itself, various correction data having different numbers of correction items and correction positions as well as correction contents can be commonly used. Can be processed.

[Brief description of the drawings]

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

FIG. 2 is an exemplary diagram showing an example of a storage structure of correction data and item data according to the embodiment.

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

FIG. 4 is a schematic diagram showing the structures of A and A ′ registers and C and 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 of the base injection angle map in a ROM.

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]

DESCRIPTION OF SYMBOLS 1 ... Diesel fuel injection pump, 2, 3 ... Actuator, 4 ... Pump-mounted control device, 5 ... Non-pump-mounted 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 lines, L1 ... serial communication lines, L2 ... power supply and clock signal lines.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kengo Sugiura 1-1-1 Showa-cho, Kariya-shi, Aichi Japan Inside Denso Co., Ltd. (56) References JP-A-6-33828 (JP, A) JP-A-5- 71404 (JP, A) JP-A-5-180065 (JP, A) JP-A-5-280388 (JP, A) JP-A-61-76759 (JP, A) JP-A-7-238857 (JP, A) JP-A-8-246917 (JP, A) JP-A-4-36048 (JP, A) JP-A-7-12005 (JP, A) JP-A-5-44544 (JP, A) JP-A-58-13140 (JP, A) JP-A-3-243426 (JP, A) JP-A-4-28901 (JP, A) JP-A-59-116031 (JP, A) JP-A-6-272611 (JP, A) Table flat 2-504054 (JP, a) PCT National Akira 63-503317 (JP, a) (58 ) investigated the field (Int.Cl. ^6, B name) F02D 45/00 312 F02D 45/00 372 F02D 45/00 374 F02D 45/00 376 F02D 41/40

Claims (5)

(57) [Claims] A first storage unit for storing basic control data; a second storage unit for separately storing correction data for the basic control data; a first storage unit and a second storage unit. Operating means for executing a predetermined operation based on the data stored in the means, wherein the second storage means is configured such that each of the correction data is any item of the control data stored in the first storage means. The arithmetic unit has a pair of item data indicating whether or not to correct the data, and the arithmetic unit executes a predetermined arithmetic operation based on the control data stored in the first storage unit. The second storage means is searched for the presence or absence of item data corresponding to the control data to be set, and if the corresponding item data exists, the corresponding control data is corrected using the correction data stored as a pair with the item data. A correction data processing device for performing the same operation after data correction. 2. The storage device according to claim 1, wherein said first storage means is a ROM, and said second storage means is a rewritable ROM.
The correction data processing device described in the above. 3. The correction data processing device according to claim 1, wherein the same data as the item data and the correction data stored in the second storage means is separately stored, and
A third storage unit physically separated from the storage unit, and the item data and the copy data of the correction data stored in the third storage unit are transferred to the second storage unit via an appropriate communication unit. A correction data processing device, which is transferred and stored in a storage unit. 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, respectively. The item data and the correction data stored in the third storage unit are mounted on a control device that controls the driving of the target device, and the first storage unit is controlled by the control unit. Mounted on the device,
4. The correction data processing device according to claim 3, wherein the correction data processing device has common control data that is basic in controlling the driving of the devices to be controlled. 5. The correction data processing according to claim 4, wherein said first storage means is a ROM, said second storage means is a nonvolatile RAM, and said third storage means is a rewritable ROM. apparatus.