JPH08177607A - Rewriting method of control quantity computing map for internal combustion engine controller and its device - Google Patents

Abstract

PURPOSE: To provide a rewriting method of a control quantity computing map for a internal combustion engine controller by which the contents of the map can be rewritten during the operation of the internal combustion engine. CONSTITUTION: An external terminal device 22 is connected to CPU of an internal combustion engine controller 2 through a serial interface 20, and communication is carried out between the internal combustion engine controller and the external terminal device to write data into EEPROM 12e. One map stored in a control data memory means consisting of EEPROM 12e is set up as a rewriting object map, and only one target value to prescribe one map point included in the rewriting object map is set up as once rewriting object. The new value of the target value being the object of rewriting is transmitted from the external terminal device 22 to the internal combustion engine controller 2 during the operation of the internal combustion engine, and the rewriting of the target value being the object of rewriting is thereby executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control amount calculation map rewriting method for an internal combustion engine control device for controlling a predetermined controlled object of an internal combustion engine by using a microcomputer, and a control used for implementing the method. The present invention relates to a map rewriting device for quantity calculation.

[0002]

2. Description of the Related Art In recent years, in internal combustion engines, many items are required to meet predetermined conditions such as exhaust gas components, fuel consumption, noise, output, etc., and control must be performed according to various control conditions. The number of control targets that are required is increasing. For example, in an internal combustion engine using an ignition device, it is necessary to control the ignition timing of the engine according to the rotational speed, the opening of a throttle valve (throttle opening), and the like. In an internal combustion engine that supplies fuel using an injector,
It is necessary to control the fuel injection timing and injection time according to the throttle opening, engine speed, acceleration, intake air temperature, atmospheric pressure and the like. Further, when a valve for controlling the exhaust timing of the engine is provided, it is necessary to control the opening degree of the valve according to the rotation speed and the throttle opening degree. In some cases, it is necessary to control the intake valve according to the rotation speed and the throttle opening so as to control the intake timing.

The characteristics required for engine ignition timing, fuel injection time, exhaust timing, intake timing, etc. differ from engine to engine. In the case of an engine mounted on a vehicle,
It is necessary to change these characteristics according to the vehicle type.

Recently, a microcomputer is often used to control these controlled objects. Generally, in a control device for an internal combustion engine using a microcomputer, at least one of the auxiliary devices of the internal combustion engine, whose control amount (operation timing or operation amount) changes in accordance with the phase and / or the magnitude of a given drive signal. A structure in which the values of the control conditions and the target values of the control amounts that define each of a plurality of map points that give the relationship between the predetermined control conditions and the target values of the control amounts are accumulated as map data And a control data storage unit that stores a control amount calculation map, and a control amount target value for a detected value of a control condition is calculated using the map to control the control amount to match the calculated target value. A control program storing means for storing a control program for realizing the internal combustion engine control means is provided, and the control target is executed by executing the control program. To control the control amount.

The microcomputer takes in control conditions from various sensors through a serial interface, detects the engine speed, and injects fuel injection time and ignition timing with respect to the engine speed and various control conditions. ,
The opening degree of the exhaust valve and the like are calculated to generate an injection command signal, an ignition signal, a drive signal for driving the valve, and the like.

In a conventional control device for an internal combustion engine, control data (data for defining a map for calculation and data such as constants used in the calculation) for performing these calculations and a control program are micro. Computer R
The data stored in the OM and sequentially input or sequentially calculated is stored in the RAM.

In such a configuration, the control data and the control program cannot be rewritten, so that it is necessary to change the control characteristics when changing the engine of the normal specification to the race specification or when changing the model. In the ROM
Need to replace itself. However, in a general internal combustion engine, in order to provide the control device with vibration resistance and weather resistance, R
Since the OM is soldered to the board and the unit of the control device is sealed by resin molding or the like, it is not possible to replace only the ROM, and it is necessary to replace the entire unit in order to respond to changes in control characteristics. It was uneconomical.

Therefore, the inventor previously provided a non-volatile memory (hereinafter also referred to as an EEPROM) whose contents can be rewritten in the microcomputer of the internal combustion engine control device as an external memory to control data and control programs. Is stored in the non-volatile memory, and a communication program for rewriting the contents of the non-volatile memory is stored in the ROM provided in the microcomputer to enable communication between the external terminal device and the microcomputer. A control device for an internal combustion engine is proposed in which the control program and control data can be rewritten by executing the control.

According to this structure, since the control data and the control program can be rewritten by communicating between the external terminal device and the microcomputer, the control characteristics can be easily changed. It can be carried out. Further, since it is not necessary to replace the ROM, it is possible to seal the unit constituting the control device for the internal combustion engine with a resin mold or the like to give the device vibration resistance and weather resistance.

In a control device for an internal combustion engine using a microcomputer, when controlling a control amount such as a fuel injection time, an ignition timing or an opening of an exhaust valve, the engine speed, throttle opening, intake air temperature, etc. It is necessary to calculate the target value of each controlled variable for each of the various control conditions. These calculations are performed using maps stored in the EEPROM in advance. The map used to calculate the target value of each control amount gives the relationship between the predetermined control condition and the target value of the control amount (for example, the relationship between the rotation speed and the ignition timing).
A structure in which control point values and target values that define each map point are integrated using map breakpoints (or fixed points that are set at predetermined intervals on the characteristic curve) of the characteristic curve of the controlled variable for each variable. Is to have.

For example, when controlling the ignition timing of the engine with respect to the rotational speed and the throttle opening, a three-dimensional map is used which gives a relationship between the ignition timing, the rotational speed and the throttle opening. When creating this three-dimensional map, for example, an ignition timing vs. rotational speed characteristic curve that gives a relationship between the ignition timing and the rotational speed is prepared for various throttle opening values, and The coordinates of each break point (map point) on the ignition timing vs. rotational speed characteristic curve are stored in a memory.

FIGS. 9A and 9B show, as an example, 2
The throttle opening θth of the cycle engine is 80 ° and 60 °
9 shows an example of an ignition timing θi vs. rotational speed N characteristic at the time. Actually, the same characteristic curve is used for the throttle opening θth
Many other values of 40 °, 20 °, etc. are created. In this case, one map is created for each characteristic curve, and a series of values of the throttle opening θth 80 °, 60 °, ...
.., map n, and the coordinates of the map points of each map are stored in a predetermined area of the EEPROM. Data allocation when the map 1, map 2, ... Map n are stored in the EEPROM is as shown in FIG.
That is, in the map 1 of this example, the rotation speed of the map point a, the ignition timing of the map point a, the map point b on the characteristic curve of FIG. Number of rotations, map point b
Information that defines each map point (control conditions that give the coordinates of each map point and the target value of the control amount) is stored in order from the one with the highest rotation speed.
Further, in the map 2, the rotation speed of the map point a ′, the ignition timing of the map point a ′, and the map point b ′ on the characteristic curve of FIG. 9B are sequentially arranged from the head address of the area assigned to the map 2. Number of rotations, map point b
Information that defines each map point, such as the ignition timing of ', is stored. Similarly, Map 3 to Map n are stored in predetermined areas of the EEPROM, and Map 1 to Map n are stored.
The map n constitutes a three-dimensional map that gives the relationship between the engine speed, the ignition timing, and the throttle opening.

In the example shown in the figure, 2 bytes of memory are allocated to each rotational speed and ignition timing, and 4 bytes of memory are used for each map point. If 1 byte is 1 data and the number of map points forming each map is 8, the number of data forming one map is 8 × 4 = 32.

When writing or rewriting the data constituting the above map in the conventional method, an external terminal device such as a personal computer is connected to the microcomputer of the internal combustion engine control unit, In the format as shown in FIG. 10, Map 1, Map 2, ...
Send data in the order of map n.

When data is written from the personal computer to the EEPROM through the microcomputer by the conventional method, communication is performed through the serial interface in the format shown in FIG. 10A, for example. The communication format shown in FIG. 10 (A) is widely adopted as the Intel HEX format. In this format, a record mark “:” (colon) is first recorded as 1-byte data at the beginning of transmission of each map. ) Is sent. Next, the number of data included in the map to be transmitted this time (8 × 4 = 32 in this example) is converted to hexadecimal and sent as 1-byte information, and the start address of the area to which the map to be transmitted this time is allocated is 2 bytes. Sent as information. Next, information "record type" indicating whether or not the map transmitted this time is the last map is transmitted as 1-byte information. If the map sent this time is the last map, set the record type to "01",
In the case of other maps, the record type is set to "00". After that, the information of each map point is 2 bytes of information such as the number of revolutions of the map point a, the ignition timing of the map point a, the number of revolutions of the map point b, the ignition timing of the map point b, ... It is transmitted as a hexadecimal number). After transmitting the information of all the map points, the sum of the numerical values from the information of "the number of data" to the information of the last map point [the ignition timing of the map point h when transmitting the map of FIG. 9 (A)] The lower 1 byte of the value obtained by subtracting from is transmitted as a "checksum". If there is a map to be transmitted, the information from ":" to "checksum" is transmitted in the same manner as above.

On the receiving side, the data giving the information of each received map point is E sequentially from the designated start address.
After writing to the EPROM and writing the specified number of data, the checksum value calculated on the receiving side is
When the checksum value transmitted at the end is compared with each other, it is determined that there is no error in communication when the two match. If the checksums do not match, it is determined that there is an error in communication, writing is invalidated, and communication is performed again.

When the internal combustion engine is operated, when the throttle opening is detected, the two throttle openings that are closest to the detected value are searched for among the throttle openings for which maps have been created. The ignition timing of each rotation speed at the throttle opening is calculated by the interpolation method using the maps created for the two throttle openings.

For example, the throttle opening is 80 °, 60 °, 4
It is assumed that it is detected that the throttle opening degree is 70 ° when the map that gives the ignition timing-rotational speed characteristic to 0 °, ... Is created. In this case, map 1 for throttle opening 80 ° and throttle opening 60 °
Using the map 2 with respect to, the ignition timing at the rotational speed at that time is calculated from each map by the interpolation method,
Next, the ignition timing at 70 ° is calculated by the interpolation method using the ignition timing calculated from the map for the throttle opening 80 ° and the ignition timing calculated from the map for the throttle opening 60 °.

When a map is created for a large number of throttle openings, the map created for the throttle opening closest to the detected throttle opening is used to determine the ignition timing at each rotational speed. It is also possible to adopt a method in which the interpolation calculation is performed and the interpolation calculation for the throttle opening is omitted.

The data of each ignition timing is the time required for the engine to rotate from the reference rotational angle position of the engine to the rotational angle position corresponding to the ignition timing at the rotational speed at that time (the number of clock pulses to be counted during that time). ) Is calculated. In this case, the microcomputer that constitutes the control device for the internal combustion engine obtains the information about the rotation angle of the engine from the pulse signal generated by the signal generator attached to the engine at the specific rotation angle position, and determines the reference rotation angle position. Ignition timing calculated when the ignition is detected (clock pulse counting)
Is started, and an ignition signal is given to the ignition circuit when the calculated ignition timing is measured. The ignition circuit generates a high voltage for ignition when an ignition signal is given, applies the high voltage to an ignition plug of a predetermined cylinder, and causes a spark in the ignition plug to perform an ignition operation.

In the above description, the case where the ignition timing is controlled has been taken as an example. However, even when the control amount such as the fuel injection time is controlled in accordance with various control conditions, various control conditions and control amounts are used. The map that gives the relationship with the target value of
A target value of the control amount for each control condition is calculated from the map, and the controlled object is driven so that the actual control amount matches the calculated target value.

[0022]

As described above, the EEPR is a means for storing the control data and the control program.
When the OM is used to communicate between the external terminal device and the microcomputer constituting the control device for the internal combustion engine so that the control program and the control data can be rewritten, various data constituting the map can be written. Instead, by actually measuring the characteristics of the internal combustion engine, such as the output, acceleration performance, exhaust gas component, etc., the optimum map for the engine can be determined, and the internal combustion engine can be easily adjusted. Especially for internal combustion engines for racing, it is desirable to adjust the characteristics of the engine so as to match the conditions of the race day, but if configured as described above, the external terminal device may be installed in the control device for internal combustion engine locally. Since it is possible to connect and rewrite the map, it is possible to adjust the characteristics of the engine to the optimum characteristics that match the conditions of the day.

In this case, when the engine is operating, E
If the EPROM can be rewritten, it is possible to quickly know the relationship between the characteristics of the engine output, acceleration performance, etc. and the ignition timing, fuel injection time, exhaust valve opening, etc. The time required to determine can be shortened.

However, generally, it takes a relatively long time (up to 10 msec per 1 byte) to write data in the EEPROM, so that the serial interface in the generally adopted format as shown in FIG. When data is written by communicating through the data, the processing time required to write each map becomes very long, and it is difficult to rewrite the data while the engine is operating. .

For example, even if the engine is rotating at a relatively low rotation speed of 1000 rpm, the time required for one rotation is only 60 msec, and during this 60 msec, the program necessary for controlling the engine is required. Need to be executed. In order to rewrite the EEPROM during the operation of the engine, it is necessary to execute a communication program in addition to the program necessary for controlling the engine during the 60 msec. However, since writing a byte of data to the EEPROM requires a maximum of 10 msec, using the communication format of FIG. 10A, the number of map points is 8 and the number of data is 32 as described above.
320 msec to rewrite (= 8 × 4) map
Therefore, it becomes impossible to rewrite map data while the engine is operating.

For the above reason, in the conventional control device for the internal combustion engine, it is necessary to rewrite the control data while the engine is stopped. Therefore, in order to know the relationship between the map and the actual characteristics of the engine, stop the engine once, rewrite the map, then start the engine and repeat the work of measuring various characteristics many times. However, there is a problem that it takes a very long time to determine the optimum map (control data).

An object of the present invention is to make it possible to rewrite the control data during the operation of the engine so that the processing time required to determine the optimum map can be shortened. Provided is a control amount calculation map rewriting method for a control device for control, and a control amount calculation map rewriting device used for implementing the method.

[0028]

The method according to the present invention comprises:
Of the accessories of the internal combustion engine, at least one of which the control amount (operation timing or operation amount) changes according to the phase and / or the magnitude of the given drive signal is targeted for control, and the content can be rewritten. A structure in which the values of the control conditions and the target values of the control amounts that define each of a plurality of map points that provide a relationship between the predetermined control conditions and the target values of the control amounts and that are composed of non-volatile memory are integrated as map data. A control data storage means for storing control data including at least one control amount calculation map, and a target value of the control amount for the detected value of the control condition are calculated using the map to obtain the control amount as the calculated target value. Control program storage means for storing a control program for realizing an internal combustion engine control means for controlling so as to match, and a CPU for executing the control program A method of changing writing at least a part of the map data for an internal combustion engine controller having.

According to the present invention, an external terminal device comprising a computer is connected to the CPU of the internal combustion engine control device via a serial interface, and communication is performed between the internal combustion engine control device and the external terminal device. Data is written to the nonvolatile memory in advance.

Then, one map stored in the control data storage means is set as a rewriting target map, and only a target value defining one map point included in the rewriting target map is set as one rewriting target. During the operation of the internal combustion engine, a new target value to be rewritten is transmitted from the external terminal device to the internal combustion engine control device to rewrite the target value to be rewritten.

In a preferred aspect of the present invention, when rewriting the map, first, the internal control unit for internal combustion engine transmits the stored contents of the control data storing unit to the external terminal unit, and the stored contents of the control data storing unit are stored. The content is stored in the reception data storage means in the external terminal device, and one of the maps stored in the reception data storage means is set as the rewriting target map, and the contents of the rewriting target map are displayed on the external terminal device. .

Further, the current value of the control condition is transmitted from the internal combustion engine control device to the external terminal device at any time, and the internal combustion engine control device is selected from a plurality of map points included in the rewriting target map displayed on the external terminal device. The target value of one map point defined by the control condition that is the closest to the current value of the control condition transmitted from the external terminal device to the external terminal device is subject to rewriting. Then, the identification code for identifying the rewriting target map and the new value of the target value as the rewriting target are transmitted from the external terminal device to the internal combustion engine control device during the operation of the internal combustion engine, and the rewriting target Let the target value be rewritten.

As shown in FIG. 2, the map rewriting device for calculating the controlled variable according to the present invention includes:
At least one device whose control amount (operation timing or amount) changes according to the phase and / or magnitude of a given drive signal is targeted for control, and is composed of a non-volatile memory whose content can be rewritten. At least a control amount calculation map having a structure in which the values of the control conditions that define each of the plurality of map points that give the relationship between the control conditions and the target values of the control amounts and the target values of the control amounts are accumulated as map data. A control data storage unit 2A storing one control data and a target value of the control amount for the detected value of the control condition are calculated by using the map, and the control amount is controlled so as to match the calculated target value. Control program storage means (not shown in FIG. 2) that stores a control program for realizing the internal combustion engine control means, and a CPU that executes the control program A book changing device at least a portion of the map data for an internal combustion engine controller 2 having a.

In the present invention, the external terminal device 22 comprising a computer is connected to the internal combustion engine control device 2 through a serial interface.

The external terminal device 22 includes control data transmission command means 22B for giving a control data transmission command to the internal combustion engine control device 2 to instruct the external terminal device 22 to transmit the stored contents of the control data storage means 2A. , A rewriting command means 2 for giving a rewriting command to the rewriting target map to the internal combustion engine control device 2 for instructing rewriting of map data
2C, a reception data storage unit 22D that stores the control data transmitted from the internal combustion engine control device to the external terminal device in response to the control data transmission command, and a map included in the control data stored in the reception data storage unit. Of these, at least a part of the map data needs to be rewritten as a rewriting target map, and the rewriting target map display means 22E for displaying the map data of the rewriting target map is transmitted from the internal combustion engine control device. Receive the current value of the control condition,
From the control conditions of each of the multiple map points that make up the rewriting target map, search for the control condition that has the value closest to the current value of the received control condition, and rewrite the map point of the searched control condition. Rewriting target map point specifying means 22F for specifying as a map point and rewriting data generating means 22 for changing the target value of the rewriting target map point to generate rewriting data as a new value.
G, a record mark indicating the beginning of the data to be transmitted when rewriting data occurs, an identification code for specifying the rewriting target map, and the value of the control condition of the rewriting target map point and the writing Rewriting data transmitting means 22H for sequentially transmitting the new target value as the replacement data and the internal combustion engine control device are provided.

Further, the internal combustion engine control device 2 includes a control data transmission means 2B for transmitting the contents of the control data storage means to the external terminal device when a control data transmission command is given from the external terminal device, and a control target A current data transmission means 2D for transmitting the current data of the engine side including the current value of the controlled variable and the current value of the control condition to the external terminal device, and a document for receiving and storing the rewriting data transmitted from the external terminal device. When it is confirmed that an external terminal device is connected to the replacement data storage means 2E and the internal combustion engine control device and the external terminal device is issuing the rewrite command, the control data storage means is stored in the control data storage device. When the map rewriting unit 2F and the internal combustion engine control unit 2G that rewrite the target value of the stored map rewriting target map point are sequentially executed, and the external terminal device is not connected It provided the operation mode switching means 2H for switching the operation mode so as to execute only the internal combustion engine control unit 2G.

The map rewriting means 2F includes a map retrieving means 2J for retrieving a rewriting target map specified by an identification code from maps stored in the control data storage means, and a rewriting target retrieved. The map point search means 2K for searching the rewriting target map point from the control conditions of the plurality of map points forming the map, and the target value of the searched rewriting target map point is different from the target value of the rewriting data. At this time, there is provided map point rewriting means 2L for rewriting the target value of the rewriting target map point stored in the control data storage means to the target value of the rewriting data.

[0038]

As described above, one map stored in the control data storage means is used as a rewriting target map, and only the target value defining one map point included in the rewriting target map is rewritten once. Since it is possible to reduce the time required for one rewriting, the external terminal device transmits a new target value for rewriting to the internal combustion engine control device while the internal combustion engine is operating. Thus, it is possible to rewrite the target value to be rewritten. If the map data is rewritten while the internal combustion engine is not operating, the result immediately appears in the measurement result of the engine characteristics. Therefore, by changing the map data variously, the optimum map can be easily determined. .

Particularly, the current control condition value is transmitted from the internal combustion engine control device to the external terminal device, the map point closest to the current control condition value is set as the rewriting target map point, and the control of the map point is performed. If the target value of quantity is rewritten, for example, connect a dynamometer to the engine, and rewrite the map data while keeping the engine speed at the map point speed to be rewritten. Thus, it is possible to immediately know how the map data is reflected in the output of the engine, so that the optimum map can be determined in a short time.

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a hardware configuration of an embodiment of the present invention. In FIG. 1, 1 is a two-cycle internal combustion engine, and 2 is an internal combustion engine controller. In the present embodiment, the internal combustion engine control device 2 determines the ignition timing of the internal combustion engine 1, the fuel injection time, and the exhaust valve opening with respect to the engine speed, the throttle opening, and the gear position of the transmission. Shall be controlled.

The internal combustion engine 1 has an intake manifold 1A and an exhaust manifold 1B, a throttle valve 3 is attached to the intake manifold 1A, and an injector 4 is attached downstream of the throttle valve 3. . An exhaust valve 5 for adjusting exhaust timing is attached to an exhaust port of the internal combustion engine,
A spark plug 6 is attached to a cylinder 1C of the internal combustion engine.

A rotor of a flywheel magnet generator 7 is attached to an output shaft 1D of the internal combustion engine 1, and a reluctor 7a1 is formed on an outer peripheral portion of a flywheel 7a which constitutes a yoke of the rotor. A pulsar (signal generator) 8 is attached to a mounting portion provided in a case of the internal combustion engine, and a magnetic pole portion of the pulsar 8 faces the reluctor 7a1. The pulsar 8 is a well-known one having an iron core having a magnetic pole portion facing the reluctor 7a1 at its tip, a signal coil wound around the iron core, and a permanent magnet that causes a magnetic flux to flow through the iron core. The pulser 8 outputs pulse-shaped signals having different polarities when facing the part and when finishing the facing. The output signal of the pulsar 8 is input to the pulsar signal input unit 9 of the internal combustion engine control device 2 as a signal for obtaining rotation information such as the rotation angle and the rotation speed of the internal combustion engine.

A throttle sensor such as a potentiometer is attached to the throttle valve 3, and a throttle opening signal obtained from the sensor is input to a throttle opening signal input unit 10 of the internal combustion engine control device 2.

The transmission mounted between the output shaft of the internal combustion engine 1 and the load is equipped with a gear position sensor for detecting a gear position, and a gear position signal obtained from the gear position sensor is used as an internal combustion engine. It is input to the gear position signal input unit 11 of the engine control device 2.

Further, a temperature sensor for detecting the intake air temperature of the engine, a temperature sensor for detecting the cooling water temperature, an atmospheric pressure sensor for detecting the atmospheric pressure, etc. may be provided. In that case, an input unit is provided for each sensor. (Interface) is provided.

The internal combustion engine controller 2 includes a CPU 12a,
A microcomputer 12 having a ROM 12b, a RAM 12c, a timer 12d, and a rewritable non-volatile memory (EEPROM) 12e, and an injection control unit 13,
An ignition control unit 14 and an exhaust valve control unit 15 are provided.

The CPU 12a has input / output ports A1 to A5. The pulsar signal input section 9 and the throttle opening signal input section 1 are connected to the input / output ports A1, A2 and A3, respectively.
0 and the output signal of the gear position signal input unit 11 are input. The serial interface 20 is connected to the input / output port A4, and the serial interface 20
Signal input line 20a, signal output line 20b, and ground line 20
c is connected via a connector 21 to a signal output line 22a, a signal input line 22b and a ground line 22c which are communication lines connected to an external terminal device 22 composed of a personal computer. The connector 21 has contacts 21a1, 21b1 and 2 respectively connected to the signal input line 20a, the signal output line 20b and the ground line 20c on the serial interface side.
First connector 21A including 1c1 and detection contact 21d1
And contact points 21 respectively corresponding to the signal output line 22a, the signal input line 22b, and the ground line 22c on the external terminal device 22 side.
Second with a2, 21b2 and 21c2 and detection contact 21d2
21B of the first connector 21
When the second connector 21B is connected to A, the contact 21a1,
21b1, 21c1 and 21d1 respectively have contacts 21a2, 21
b2, 21c2 and 21d2 are connected.
The detection contact 21d1 is connected to the input / output port A5 of the CPU and is connected to a power source (not shown) through the resistor R. The detection contact 21d2 is connected to the ground wire 22c on the external terminal device 22 side.

In this embodiment, the detection contacts 21d1 and 21d2 of the connector 21 are provided to detect whether or not the external terminal device 22 is connected to the internal combustion engine control device 2. When the second connector 21B is not connected to the first connector 21A, the potential of the input port A5 of the CPU is at a high level because the detection contact 21d1 is not grounded. First and second connector 21
When A and 21B are connected, the detection contact 21d1 is grounded through the detection contact 21d2, so that the potential of the input port A5 becomes zero. In this embodiment, it is determined that the external terminal device 22 is not connected when the potential of the input port A5 is at a high level, and the external terminal device 22 is connected when the potential of the input port A5 becomes zero. It is determined that it has been done. In this embodiment, the contacts 21 of the connectors 21A and 21B are
The external terminal detecting means is constituted by d1 and 21d2 and the resistor R.

In the present embodiment, the structure in which the values of the control condition and the target value of the control amount that define each of the plurality of map points that give the relationship between the predetermined control condition and the target value of the control amount are accumulated as map data. And an internal combustion engine control means for calculating a control amount calculation map having the following, and controlling the target value of the control amount with respect to the detected value of the control condition by using the map to control the control amount so as to match the calculated target value. And a control program for doing so are stored in the EEPROM 12e,
A control data storage means and a control program storage means are realized by the EEPROM 12e.

Here, similarly to the example given in the description of the prior art, the ignition timing is set to the rotation speed and the throttle opening by using a three-dimensional map which gives the relationship between the engine ignition timing, the rotation speed and the throttle opening. Taking the case of controlling the engine speed with respect to the engine speed as an example, a characteristic curve that gives the relationship between the ignition timing and the rotational speed at various throttle opening is, for example, as shown in FIG.
As shown in FIG. 8B, the allocation of the three-dimensional map stored in the EEPROM 12e is as shown in FIG.

The ROM 12b stores a communication program for communicating between the external terminal device 22 and the internal combustion engine control device 2, and the ROM implements a communication program storage means.

When writing to the EEPROM 12e, as shown in the figure, the external terminal device 22 is connected to the CPU 12a via the serial interface 20, and communication is performed between the external terminal device 22 and the CPU 12a.

In the present embodiment, while the internal combustion engine is stopped, communication is performed between the external terminal device 22 and the internal combustion engine control device 2 in the format shown in FIG.
A first write operation mode for writing to the OM 12e and communication between the external terminal device 22 and the internal combustion engine controller 2 in the format shown in FIG. The second write operation mode for rewriting is performed.

Therefore, in the external terminal device 22, as shown in FIG. 2, the write data transmission command means 22A, the control data transmission command means 22B, the rewrite command means 22C, the reception data storage means 22D, and Rewriting target map display means 2
2E, rewriting target map point specifying means 22F, rewriting data generating means 22G, and rewriting data transmitting means 2
2H and write data generating means 22J are provided.

In the internal combustion engine control device 2, the control data storage means 2A, the control data transmission means 2B, the write data transmission means 2C, the current data transmission means 2D, and the rewriting data storage means 2E are provided. A map rewriting means 2F, an internal combustion engine control means 2G, and an operation mode switching means 2H are provided. The map rewriting means 2F is the map search means 2J.
And map point retrieving means 2K and map point rewriting means 2L.

Of the means provided in the external terminal device 22, the write data transmission command means 22A outputs write data (data to be written in the control data storage means 2A) such as control programs and control data while the internal combustion engine is stopped. The control data transmission command means 22B is a means for giving a write data transmission command for instructing the transmission to the internal combustion engine control device 2, and the control data transmission command means 22B commands the transmission of the stored contents of the control data storage means to the external terminal device 22. It is a means for giving a control data transmission command to the internal combustion engine control device 2. The rewriting instruction means 22C is means for giving a rewriting instruction to the internal combustion engine control device 2 to instruct to rewrite the map data of the rewriting target map.

These write data transmission command means 22A,
The control data transmission instruction means 22B and the rewriting instruction means 22C are realized by means for transmitting a predetermined instruction value by operating a keyboard 22K provided in the external terminal device 22, for example.

The reception data storage means 22D is means for storing the control data transmitted from the internal combustion engine control device 2 to the external terminal device 22 in response to the control data transmission command. This means is provided in the external terminal device. Configured RAM.

The rewriting target map display means 22E uses, as a rewriting target map, a map for which at least a part of the map data included in the control data stored in the received data storage means needs to be rewritten. A means for displaying the map data of the map to be replaced, which means, for example, a display provided in the external terminal device 22 and a keyboard operation among the maps transmitted from the internal combustion engine control device 2 to the external terminal device. And a means for displaying the map selected as the rewriting target map on the display in a form in which the respective map points are complemented by straight lines.

For example, when the map giving the relationship between the ignition timing and the rotational speed when the throttle opening is 80 ° is to be rewritten, a graph as shown in FIG. 9A is displayed on the display. Let

Rewriting target map point specifying means 22F
Receives the current value of the control condition transmitted from the internal-combustion-engine control device 2, and uses the current value of the control condition received from the control conditions of the plurality of map points forming the rewriting target map. It is a means for searching the control condition having the closest value and specifying the map point of the searched control condition as the rewriting target map point. This identification means
For example, by calculating a difference between the current value of the control condition transmitted from the internal combustion engine control device 2 to the external terminal device 22 and the value of the control condition of each map point forming the rewriting target map, It is realized by means for specifying the map point defined by the control condition having the smallest difference from the current value of the control condition transmitted from the control device 2 as the rewriting target map point.

The specified rewriting target map point is displayed in a form in which an appropriate mark such as a circle is attached to the corresponding portion on the display. For example, FIG. 9 (A)
When the map No. is set as the rewriting target map, the rotational speeds (control conditions) that regulate the map points h, f, d, b ... Are 1000 rpm, 2000 rpm, 3000 rpm, and 4 respectively.
000 rpm, ..., The current value of the rotation speed (control condition) transmitted from the internal combustion engine controller 2 is 3200 rpm.
If it is, the map point d is specified as the rewriting target map point, and the map point d is marked with a circle or the like.

The rewriting data generating means 22G is means for changing the target value of the rewriting target map point to generate rewriting data having a new value. This means defines the rewriting target map point. The target value θi of the control amount to be changed is changed by ± Δθ by operating the keyboard to generate a new target value used for rewriting.

For example, when the target value of the ignition timing at the map point d in FIG. 9 is changed, the target value of the ignition timing θi at the rewritten target map point d is pushed every time the up and down scroll keys (arrow keys) of the keyboard are pressed. Is changed by + 0.5 ° or −0.5 °, and the rewritten value of the target value of the ignition timing at the map point d is generated as rewriting data.

When the rewriting data is generated, the rewriting data transmitting means 22H displays the control condition value of the rewriting target map point and the new target value as the rewriting data in FIG. This is means for sequentially transmitting to the internal combustion engine control device in the format shown in (B).

In the format of FIG. 10B, first, a record mark indicating the beginning of the data to be transmitted, an identification code (map NO) for specifying the rewriting target map, and one rewriting target map The value of the control condition (for example, the number of revolutions) which is the data for rewriting the point and the new value of the target value (for example, the ignition timing) are sequentially transmitted from the external terminal device 22 to the control device for the internal combustion engine.

The write data generating means 22J is means for generating data (control program or control data) to be written in the EEPROM 12e while the internal combustion engine is stopped. This means is, for example, a write input from an external input device. It is configured by means for temporarily storing data in the RAM of the external terminal device and means for reading the write data and sequentially outputting it.

Among the means provided in the internal combustion engine ignition device 2,
As described above, the control data storage means 2A stores control data including a map for control amount calculation.
It is realized by the ROM 12e.

The control data transmitting means 2B executes the communication program stored in the ROM of the internal combustion engine control device when the control data transmission command is given from the external terminal device 22 to execute the control stored in the EEPROM 12e. It is means for transmitting data (map data and various constants, arithmetic expressions, etc.) to the external terminal device 22. This communication is shown in Figure 1.
It is performed by the general format shown in 0 (A).

The write data transmitting means 2C executes the communication program stored in the ROM 12b of the internal combustion engine control device when the write data transmission command is given from the external terminal device 22 to thereby execute the external terminal device. 22 for communicating between the internal combustion engine control device 2 and the internal combustion engine controller 2, and the write data generated by the write data generating means 22J is sequentially transmitted in the format shown in FIG. .

The current data transmission means 2D is the current value of the controlled variable (ignition timing, injection time, exhaust valve angle, etc.) to be controlled and the current control conditions (rotation speed, throttle opening, and other various sensor outputs). A means for transmitting the current data on the engine side including a value to the external terminal device 22 at any time, and this means is realized by an interrupt routine executed every time a timer measures a predetermined time (for example, 4 msec). The transmission of this current data is performed in the format shown in FIG.

The rewriting data storage means 2E is means for receiving and storing rewriting data transmitted from the external terminal device 22, and this means is, for example, rewriting sequentially transmitted from the external terminal device 22. It comprises a buffer memory for temporarily storing the data for use, and a means for storing the data stored in the buffer memory in a specific area of the RAM when all the data is received.

The operation mode switching means 2H stores the control data when it is confirmed that the external terminal device 22 is connected to the internal combustion engine control device 2 and the external terminal device issues a rewrite command. The map rewriting means 2F for rewriting the target value of the map rewriting target map points stored in the means 2A and the internal combustion engine control means 2G are sequentially executed,
It is a means for switching the operation mode so that only the internal combustion engine control means 2G is executed when the external terminal device 22 is not connected.

The map rewriting means 2F and the map retrieving means 2J for retrieving the rewriting target map specified by the identification code (map NO.) From the maps stored in the control data storage means 2A. The map point searching means 2K for searching the rewriting target map point from the control conditions of the plurality of map points forming the rewriting target map, and the target value of the searched rewriting target map point are the rewriting data. And the target value of the rewriting target map point stored in the control data storing means when the target value is different from the target value of the rewriting data, the map point rewriting means 2L can be used.

In this embodiment, the EEPROM 12e is used to write the control data and the control program, and to change the control data and the control program.
When rewriting the data, the write data transmission command means 22A
10 by executing the communication program stored in the ROM 12b with the operation mode set to the first write operation mode and the internal combustion engine stopped with the write data transmission command generated by In the communication format shown in A), data is transmitted from the external terminal device 22 to the CPU 12a by a method similar to the conventional method, and E
Each map and control program are written in a predetermined area of the EPROM 12e.

When the map is rewritten during the operation of the internal combustion engine, the operation mode is set to the second writing operation mode, and writing to the EEPROM is performed by the method according to the present invention. In this second write operation mode, EEPRO
Only one map stored in the M12e is set as a rewriting target map, and only a target value defining one map point included in the rewriting target map is set as one rewriting target during the operation of the engine. An external terminal device transmits a new target value to be rewritten to the internal combustion engine control device to rewrite the target value to be rewritten.

In this embodiment, an example of a flow chart showing an algorithm of the control program stored in the EEPROM 12e for realizing the respective means shown in FIG. 2 is shown in FIGS. In these flowcharts, "ECU" means the internal combustion engine control device 2 of FIG. 1, and "PC" means the external terminal device 22.

FIG. 3 shows an algorithm of the main routine. In this main routine, first, each part is initialized (initialized), the flag 1 is set to 0, and then the flag 1 is set to 0.
1 from "0", "1" or "2" from the external terminal device 22
Determine if the command value of the byte was received. These 1-byte command values mean a specific command given from the external terminal device to the internal combustion engine control device 2,
“0” is a write data transmission command for instructing the external terminal device 2 to transmit the data to be written in the EEPROM 12e while the internal combustion engine is stopped. Further, "1" is a control data transmission command for instructing to transmit the control data stored in the EEPROM 12e to the external terminal device, and "2" is an instruction for executing rewriting of the map data of the rewriting target map. It is a rewrite command to do. These commands are given to the internal combustion engine control device 2 by operating the keyboard 22K of the external terminal device 22.

When the 1-byte command value received by the internal combustion engine control device 2 is "0" (write data transmission command), the communication program stored in the ROM of the internal combustion engine control device 2 is used. In the format of FIG. 10A, the external terminal device 22 is caused to transmit the write data (at least one of the control program and the control data to be written in the EEPROM) to the internal combustion engine control device 2.

When the 1-byte command value received by the internal combustion engine control device 2 is "1" (control data transmission command), control data is transmitted from the internal combustion engine control device 2 to the external terminal device 22. Let it be done.

When the 1-byte command value received by the internal-combustion-engine control device 2 is "2", the flag 1 is set to 1 to return to the state of waiting for the reception of the 1-byte command value from the external terminal device. .

When the internal-combustion-engine control device 2 does not receive the 1-byte command value, the state of the port A5 of the CPU 12a is checked and the potential of the port A5 is at a high level (when the external terminal device is not connected). ), Processing required for ignition timing control, exhaust valve control, and fuel injection time control (calculation of ignition timing, calculation of exhaust valve opening, calculation of fuel injection time, etc.) To perform.

When the potential of the port A5 is zero, it is detected whether or not the flag 1 is 1, and when the flag 1 is not 1, the state returns to the state of waiting for the reception of the command value of 1 byte,
When the flag 1 is 1, the routine MO shown in FIG.
After executing the NIT, the ignition timing, the exhaust valve, and the fuel injection time are controlled.

FIG. 4 shows that when the external terminal device 22 transmits rewriting data to the internal combustion engine control device 2 in the format shown in FIG. This interrupt routine is executed every time 1-byte data is received. In this interrupt routine, each time 1-byte data is received, the data is stored in the reception buffer RAM. After receiving the last 1-byte data of the rewriting data, the contents of the receiving buffer RAM are R
It is stored in a predetermined area A of the AM 12c, the flag 2 is set to 1, and the process returns to the main routine.

In the routine MONIT of FIG. 5, it is first determined whether or not the flag 2 is 1 (whether or not the rewriting data is received). If the flag 2 is 1, the flag 2 is determined. After setting 0 to 0, the identification code (map No.) included in the rewriting data is referred to search the map identified by the identification code, and the leading address of the searched map is detected.

Then, it is determined whether or not the map retrieved has the same control condition as the value of the control condition (the number of revolutions in this example) received from the external terminal device. As a result, when the same rotation speed is present, whether or not the data (target value of control amount) at the next address of the address at which the rotation speed is stored is the same as the target value included in the rewriting data. If they are not the same, the target value as the rewriting data is written in the corresponding address of the EEPROM 12e (the address in which the target value to be rewritten is stored). When the content of the address in which the target value to be rewritten is stored is the same as the target value as the rewriting data, the process returns to the main routine without writing to the EEPROM.

FIG. 6 shows an external interrupt routine executed each time a pulser signal is input. In this routine, first, the engine speed is calculated from the pulse generator signal generation interval and the engine speed is stored in RAM. After storing, the measured value of the ignition timing already calculated in the main routine is put in the compare register for measuring the ignition timing. The compare register is
The measurement value of the ignition timing is compared with the count value of the counter counting the clock pulse, and the ignition signal Vi is generated when the measurement value of the ignition timing is measured. When the ignition signal Vi is generated, the ignition control unit 14 generates a high voltage for ignition and causes the spark plug 6 to generate a spark to ignite the engine.

In the main routine, the ignition timing at each throttle opening and rotation speed is calculated using a map that gives the relationship between the rotation speed and ignition timing at each throttle opening. This ignition timing data is calculated in the form of the time required to rotate at the rotation speed at that time from the reference rotation angle position of the engine detected by the pulser signal to the rotation angle position (ignition position) corresponding to the ignition timing. To be done.

FIG. 7 shows a timer interrupt routine executed every time a timer provided in the microcomputer of the internal combustion engine controller 2 generates a signal. The timer constantly measures time by counting clock pulses, and generates a signal every time a fixed time (4 msec in this embodiment) is measured to execute the interrupt routine of FIG. In this interrupt routine, after a drive signal is given to the DC servo motor that drives the exhaust valve so that the exhaust valve opening is maintained at a calculated value, control conditions such as the rotational speed, the throttle opening, and the intake air temperature are set. , The ignition timing, the fuel injection time from the injector, the current values of the controlled variables of various controlled objects such as the opening of the exhaust valve, and the like are executed by executing the communication program stored in the ROM. It is transmitted to the external terminal device as the current data of the institution in the format shown in.

In this embodiment, when the map is rewritten during the operation of the internal combustion engine, first, the 1-byte command value given from the external terminal device 22 to the internal combustion engine control device 2 is set to "1" and the control data is set. Give a send command. When the 1-byte command value "1" is received, the control device 2 for internal combustion engine transmits all the control data stored in the EEPROM 12e to the external terminal device 2, and the EEPROM
The same control data as that stored in M12e is stored in the RAM constituting the received data storage means of the external terminal device 22.

After the control data is stored in the RAM of the external terminal device 22, the data stored in the control data storage means 1
One map is used as a rewriting target map, and the contents of the rewriting target map are displayed on the display of the external terminal device. The rewriting target map is selected by operating the keyboard. Here, the map that gives the relationship between the ignition timing and the rotational speed when the throttle opening is 80 ° is the rewriting target map, and this rewriting target map is a line graph as shown in FIG. 9A. Shall be displayed on the display in the form. Further, it is assumed that map allocation in the EEPROM is as shown in the memory map of FIG.

Next, the command value "2" of the rewriting command is given from the external terminal device 22 to the internal combustion engine control device 2 by operating the keyboard.

From the internal combustion engine control device 2 side, the current routine data of the engine is transmitted to the external terminal device by executing the interrupt routine of FIG. 7 at regular intervals (4 msec in this example).

In the external terminal device 22, of the plurality of map points a, b, c, ... Included in the rewriting target map displayed on the display, the one closest to the current value of the control condition transmitted to the external terminal device. The target value of one map point defined by the control condition is set as the rewriting target, and the map point to be rewritten is marked on the display.

For example, when the map shown in FIG. 9A is used as the rewriting target map and the current value of the rotation speed (control condition) transmitted from the internal combustion engine controller 2 is 3200 rpm, the map The point d is specified as the rewriting target map point, and a mark such as a circle is put on the map point d.

By operating the keyboard here,
By changing the target value (ignition timing in this example) of the rewriting target map point by + Δθ (for example + 0.5 °) or −Δθ (for example −0.5 °), rewriting data is generated, and this rewriting data is generated. The replacement data is transmitted to the internal combustion engine control device 2 in the format shown in FIG. The control device for the internal combustion engine receives the rewriting data and stores it in the rewriting data storage means (RAM).

Since the rewrite command has already been given and the flag 1 is "1" in the main routine of FIG. 3, the routine of FIG. 5 is executed and the map stored in the control data storage means 2A is executed. The map to be rewritten is searched from. This search is performed when the rewriting data is transmitted to the internal combustion engine control device 2 in the format of FIG. 10B from the numbers attached to the map stored in the control data.
Map No. corresponding to the identification code (map No.) transmitted next. By looking for. After the map to be rewritten is searched, the map point a of the map to be rewritten,
The control condition that defines the map point to be rewritten from among b, ... (In this example, the rotation speed of the map point d = 3000)
rpm) is searched, and the target value (ignition timing) of the map point d stored next to the searched number of revolutions of the map point d is compared with a new target value as rewriting data.
As a result, if the two are different, the EEPROM 12e
A new target value as rewriting data is written in the address in which the target value of the map point d of 1 was stored.

After rewriting the target value of the map point to be rewritten in this way, the internal combustion engine control means is executed,
Control of various control objects such as ignition timing control, exhaust valve opening control, fuel injection time control, etc. is performed.

In this control, the microcomputer 12 uses the throttle sensor, pulser, and gear position sensor to provide information on each throttle opening, rotation speed (calculated from the generation cycle of the pulser output signal), and gear. The fuel injection time and the ignition timing at the position are calculated, and the measured value of the ignition timing and the measured value of the injection time are respectively measured when the reference rotation angle position is measured by the pulser signal, and the compare register for measuring the ignition timing and the injection time are measured. Put it in the compare register for the engine and start measuring the ignition timing and injection time, and output port B1
Supplies the injection command signal Vj to the injection control unit 13. When the measurement of the injection time is completed, the output of the injection command signal Vj is stopped, and when the ignition timing is measured, the ignition signal Vi which determines the ignition timing is supplied from the output port B2 to the ignition control unit 14.

The microcomputer also calculates the opening of the exhaust valve at each rotational speed, throttle opening, and gear position, and gives a valve opening signal Vθ for giving the opening.
To the output port B3.

The injection control unit 13 is the microcomputer 1
When the injection command signal Vj is given from the output port B1 of No. 2, a drive current is given to the injector 4. The injector 4 opens its valve when the drive current reaches a predetermined value, and injects fuel supplied from a fuel pump (not shown) into the intake manifold 1A.

The ignition control section 14 is provided with an ignition circuit for generating a high voltage for ignition when the ignition signal Vi is given, and when the ignition signal Vi is given, the ignition plug 6 is provided.
A high voltage for ignition is applied to and the ignition operation is performed.

The exhaust valve control section 15 applies a drive current to an actuator (not shown) attached to the exhaust valve 5 in accordance with a valve opening signal Vθ supplied from the output port B3 of the CPU 12a of the microcomputer 12 to drive the exhaust valve 5 to operate. Displace to the calculated opening.

When the external terminal device 22 is removed, the CPU
When the potential of the port A5 of 12a is at a high level, only the internal combustion engine control means is executed and the engine is operated steadily.

As described above, in the second rewriting operation mode of the present embodiment, only one map point of the rewriting target map is the rewriting target, and only the data of this rewriting target map point is rewritten. Therefore, rewriting can be performed once within a time that does not cause a problem with respect to the time required to control the internal combustion engine. Therefore, the target value of the rewriting target map point can be rewritten during the operation of the internal combustion engine. In the present embodiment, the control condition defining the rewriting target map point is set to the value closest to the current value of the control condition. Therefore, when the target value of the rewriting target map point is rewritten, the result is immediately in operation. It is reflected in the characteristics of the institution. Therefore, for example, by connecting a dynamometer to the engine and letting the engine rewrite the map while keeping the engine speed constant,
The change in the output of the engine due to the rewriting of map data can be immediately known, and the optimum map data can be determined in a short time.

In the above embodiment, the map point defined by the control condition having the value closest to the current value of the control condition is set as the rewriting target, but the map point to be rewritten is set by another method. It can be specified. For example, the map points to be rewritten may be determined by the keyboard of the external terminal device.

In the above embodiment, the control data transmitting means is realized by the process of transmitting the control data from the internal combustion engine control device to the external terminal device in the main routine of FIG. The current data transmission means is realized by the process of transmitting the current value of the data to the external terminal device.

Further, the interruption routine of FIG. 4 realizes the rewriting data storage means, and in the main routine of FIG. 3, the process of setting the flag 1 to “1” when the command value “2” is given, The operation mode switching means is realized by the process of determining the potential of the port A5 and the process of determining the content of the flag 1.

Further, the map NO. Of the routine MONIT of FIG. The map point searching means is realized by the process of searching for, and the map point searching means is realized by the process of determining whether or not there is the same rotation speed as the received rotation speed from the searched map. In addition, in the routine of FIG.
It is determined whether the data at the address next to the detected rotation speed is the same as the received data, and if not, the EEPROM
The map point rewriting means is realized by the process of writing the received data.

In the above embodiment, the ignition timing, the fuel injection time and the exhaust valve opening are controlled according to the throttle opening, the rotational speed and the gear position of the transmission. Other conditions may be added, and the control conditions may be different for each controlled object. For example,
In some cases, the ignition timing is controlled according to the rotation speed, and the fuel injection time is controlled according to the throttle opening, intake air temperature and atmospheric pressure.

In the above embodiment, the connectors 21A and 2A
Although the external terminal detecting means for detecting whether or not the external terminal device is connected by using one contact point of 1B as a detection contact point, a switch for detecting the presence or absence of the connection of the external terminal device is separately provided. Provided with connectors 21A and 21B
When the and are connected, the switch may be operated by a part of the connector to automatically turn on or off, so that the presence or absence of the connection of the external terminal device may be detected. Further, a signal for confirming that the external terminal device is connected may be generated by operating the keyboard of the external terminal device.

In the above embodiment, only the injection time is controlled with the fuel injection start timing being constant (when the pulser generates a signal), but both the fuel injection start timing and the injection time are controlled. You can also do so.

In the above embodiment, the ignition device, the fuel injection device and the exhaust valve are controlled, but the present invention can be applied to the case where other accessory devices are controlled.

[0114]

As described above, according to the present invention, one map stored in the control data storage means is used as a rewriting target map, and one map point included in the rewriting target map is defined. Since only the target value is set as the target of one rewriting, the time required for one rewriting can be shortened, and the rewriting from the external terminal device to the internal combustion engine control device can be performed during the operation of the internal combustion engine. A new target value to be rewritten can be transmitted to rewrite the target value to be rewritten. Therefore, while operating the internal combustion engine, it is possible to easily determine the optimum map by rewriting the map data and observing the measurement results of the characteristics of the engine. It can be shortened.

In particular, according to the inventions set forth in claims 2 and 3, the internal control unit for the internal combustion engine transmits the current value of the control condition to the external terminal device, and the map point closest to the current value of the control condition is transmitted. Is set as the map point to be rewritten, and the target value of the control amount of the map point is rewritten. Therefore, for example, a dynamometer is connected to the internal combustion engine, and the control condition is kept at the value of the control condition of the map point to be rewritten By rewriting the map data in this state, it is possible to immediately know how the map data is reflected in the output of the engine, and the optimum map can be determined in a short time.

[Brief description of drawings]

FIG. 1 is a block diagram showing a hardware configuration of an exemplary embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration example of a rewriting device according to the present invention.

FIG. 3 is a flow chart showing an algorithm of a main routine of a program used for realizing each function realizing means in the embodiment of the present invention.

FIG. 4 is a flowchart showing an algorithm of an interrupt routine executed every time the control device for an internal combustion engine receives a signal from an external terminal device in the embodiment of the present invention.

FIG. 5 is a flowchart showing an algorithm of a routine executed when rewriting the memory in the embodiment of the present invention.

FIG. 6 is a flowchart showing an algorithm of an interrupt routine executed when the pulser generates a signal in the embodiment of the present invention.

FIG. 7 is a flowchart showing an algorithm of an interrupt routine executed every time the timer measures a certain time in the embodiment of the present invention.

FIG. 8 is a memory map showing an example of memory allocation in the EEPROM.

9 (A) and 9 (B) are diagrams showing examples of ignition timing vs. rotational speed characteristics for different throttle openings.

FIG. 10A is an explanatory diagram showing a communication format that has been conventionally used. (B) is an explanatory view showing a communication format used in the method of the present invention.

[Explanation of symbols]

 1 Internal Combustion Engine 2 Control Device for Internal Combustion Engine 3 Throttle Valve 4 Injector 5 Exhaust Valve 6 Spark Plug 8 Pulser 9 Pulser Signal Input Section 10 Throttle Opening Signal Input Section 11 Gear Position Signal Input Section 12 Microcomputer 12a CPU 12b ROM 12c RAM 12d Timer 12e EEPROM 2A Control data storage means 2B Control data transmission means 2C Write data transmission means 2D Current data transmission means 2E Rewriting data storage means 2F Map rewriting means 2G Internal combustion engine control means 2H Operation mode switching means 2J Map retrieval means 2K map point search means 2L map point rewriting means 22A write data transmission command means 22B control data transmission command means 22C rewriting command means 22D received data storage means 22E rewriting target map display hand 22F rewrite target map point specifying unit 22G rewriting data generation means 22H rewriting data transmission means 22J write data generating means

Claims (3)

[Claims] 1. A control target is at least one device of an auxiliary device of an internal combustion engine, the control amount (operation timing or amount) of which changes according to the phase and / or magnitude of a given drive signal. Of the control condition and the target value of the control amount that define each of a plurality of map points that provide a relationship between the predetermined control condition and the target value of the control amount. Control data storing means for storing control data including at least one control amount calculation map having a structure integrated as
Control storing a control program for realizing an internal combustion engine control means for calculating a target value of a control amount with respect to a detected value of a control condition by using the map and controlling the control amount to match the calculated target value. A control amount calculation map rewriting method for rewriting at least a part of the map data of an internal combustion engine control device including a program storage means and a CPU that executes the control program, the external terminal device comprising a computer. Is connected to the CPU of the internal combustion engine control device through a serial interface, and communication is performed between the internal combustion engine control device and the external terminal device so that data is written to the nonvolatile memory. In this way, one map stored in the control data storage means is set as a rewriting target map, and the rewriting is performed. Only the target value that defines one map point included in the elephant map is the target of one-time rewriting, and the target value that is the target of the rewriting from the external terminal device to the internal combustion engine control device is updated while the internal combustion engine is operating. A control value calculation map rewriting method for an internal combustion engine control device, characterized in that a target value that is a rewriting target is rewritten by transmitting a specific value. 2. At least one of the auxiliary equipment of an internal combustion engine, whose control amount (operation timing or operation amount) changes according to the phase and / or the magnitude of a given drive signal, is controlled, Of the control condition and the target value of the control amount that define each of a plurality of map points that provide a relationship between the predetermined control condition and the target value of the control amount. Control data storing means for storing control data including at least one control amount calculation map having a structure integrated as
Control storing a control program for realizing an internal combustion engine control means for calculating a target value of a control amount with respect to a detected value of a control condition by using the map and controlling the control amount to match the calculated target value. A control amount calculation map rewriting method for rewriting at least a part of the map data of an internal combustion engine control device including a program storage means and a CPU that executes the control program, the external terminal device comprising a computer. Is connected to the CPU of the internal combustion engine control device through a serial interface, and communication is performed between the internal combustion engine control device and the external terminal device to write data to the nonvolatile memory. In this way, the control device for the internal combustion engine transmits the stored contents of the control data storage means to the external terminal device, The storage content of the control data storage means is stored in the reception data storage means of the external terminal device, and one of the maps included in the control data stored in the reception data storage means is set as a rewriting target map, The contents of the map to be rewritten is displayed on the external terminal device, the current value of the control condition is transmitted from the control device for the internal combustion engine to the external terminal device, and a plurality of map points of the rewriting target map displayed on the external terminal device are displayed. Among these, the target value of one map point defined by the control condition closest to the current value of the control condition transmitted to the external terminal device is the target of rewriting, and an identification code for identifying the rewriting target map. A new value of the target value to be rewritten is transmitted from the external terminal device to the internal combustion engine control device during the operation of the internal combustion engine, and the target value to be rewritten is rewritten. Control amount calculation map rewriting method for an internal combustion engine control apparatus characterized by causing. 3. At least one of the auxiliary equipment of the internal combustion engine, whose control amount (operation timing or operation amount) changes according to the phase and / or the magnitude of a given drive signal, is set as a control target. Of the control condition and the target value of the control amount that define each of a plurality of map points that provide a relationship between the predetermined control condition and the target value of the control amount. Control data storing means for storing control data including at least one control amount calculation map having a structure integrated as
Control storing a control program for realizing an internal combustion engine control means for calculating a target value of a control amount with respect to a detected value of a control condition by using the map and controlling the control amount to match the calculated target value. A map rewriting device for calculating a control amount for rewriting at least a part of the map data of an internal combustion engine control device comprising a program storage means and a CPU for executing the control program, the external terminal device comprising a computer Is connected to the CPU of the control device for an internal combustion engine via a serial interface, and the external terminal device issues a control data transmission command for instructing to transmit the storage content of the control data storage means to the external terminal device. Control data transmission command means to be given to the control device for the internal combustion engine, and rewriting the map data of the rewriting target map Rewriting command means for giving a rewriting command for instructing the internal combustion engine control device, and reception for storing control data transmitted from the internal combustion engine control device to the external terminal device in response to the control data transmission command. A map data of the rewriting target map, which is a rewriting target map, in which at least a part of the map data included in the control data stored in the reception data storage unit is required to be rewritten. Rewriting target map display means for displaying, and the current value of the control condition transmitted from the internal combustion engine control device, and received from the respective control conditions of the plurality of map points of the rewriting target map. The control condition having the value closest to the current value of the control condition is searched, and the map point of the searched control condition is specified as the rewriting target map point. Rewriting target map point specifying means, rewriting data generating means for changing the target value of the rewriting target map point to generate rewriting data having a new value, and when the rewriting data is generated The record mark indicating the beginning of the data to be transmitted, the identification code for identifying the rewriting target map, the value of the control condition of the rewriting target map point, and the new target value as the rewriting data. And a rewriting data transmitting means for sequentially transmitting the value to the internal combustion engine control device, wherein the internal combustion engine control device stores the control data when the control data transmission command is given from the external terminal device. A control data transmitting means for transmitting the contents of the means to the external terminal device, a current data transmitting means for transmitting the engine side current data including the current values of the control conditions to the external terminal device, Rewriting data storage means for receiving and storing rewriting data transmitted from the external terminal device, and the external terminal device has been confirmed to be connected to the internal combustion engine control device, and the external terminal device has been confirmed. Is executing the rewriting command, the map rewriting means for rewriting the target value of the map rewriting target map point stored in the control data storage means and the internal combustion engine control means are sequentially executed. And an operation mode switching unit that switches the operation mode so that only the internal combustion engine control unit is executed when the external terminal device is not connected, and the map rewriting unit is stored in the control data storage unit. Map retrieving means for retrieving the rewriting target map specified by the identification code from among the existing maps, and a plurality of markers forming the retrieved rewriting target map. Map point retrieval means for retrieving the rewriting target map point from the control conditions of the rewriting point, and the control data when the target value of the retrieved rewriting target map point is different from the target value of the rewriting data. Map point rewriting means for rewriting the target value of the rewriting target map point stored in the memory means to the target value of the rewriting data, and calculating the control amount of the control device for the internal combustion engine. Map rewriting device.