JP2002276503A - Internal combustion engine and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly combine an information storing medium having written correction data for absorbing an individual difference of an injector mounted to an internal combustion engine body with an injector exclusively belonging to the information storing medium. SOLUTION: The information storing medium 4 is constituted separately from a control device 5 for controlling the injector 3, and is mounted to the internal combustion engine body 12a, namely a mechanical device. The information storing medium 4 is connected to the control device 5 through a signal wire 61, and the correction data stored in the information storing medium 4 is read into the control device 5. The information storing medium 4 is mounted together in mounting the injector 3 to the internal combustion engine body 12a, thereby preventing mismatch between the injector 3 and the information storing medium 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an internal combustion engine and a method for manufacturing the same.

[0002]

2. Description of the Related Art In an internal combustion engine such as a common rail type diesel engine used as a power source for an automobile or the like, an injector for supplying fuel to a cylinder of a main body of the internal combustion engine opens and closes in response to a control signal. The fuel supplied to the fuel cell is injected. The control signal defines the valve opening time and valve opening time of the injector,
The valve opening timing and the valve opening time are calculated by the engine control unit as the control device based on the command injection timing and the command injection amount. However, valve-opening responsiveness to a control signal and the like vary depending on individual differences between injectors, and the fuel injection characteristics of the injectors vary among the injectors. Therefore, in order to respond to recent exhaust gas reduction requests,
When calculating the valve opening timing and the valve opening time, there is a technique for adding a correction operation according to the injection characteristics of each injector to absorb individual differences of the injectors.

Specifically, the injection characteristics of each injector are measured in advance, and correction data of the control signal corresponding to the injection characteristics can be identified on the surface of the injector in the form of a bar code or the like. This is read using a code reader or the like, and the correction data is written into a ROM or the like in the engine control unit (Japanese Patent Laid-Open No. 7-332142).
JP-A No. 2000-501155).

[0004] In this technique, the correction data written in the information storage medium is exclusive to the corresponding injector. Therefore, the engine control unit requires the internal combustion engine body in which the injector corresponding to the written correction data is assembled. It must be mounted on the vehicle on which it is mounted.

[0005]

However, since the internal combustion engine body, which is a mechanical device, and the engine control unit, which is an electrical device, are assembled on separate production lines, when they are mounted on a vehicle body, For the first time, the combination of the internal combustion engine body and the engine control unit is finally determined.

For this reason, considerable care must be taken during the manufacture of the internal combustion engine to ensure that the injector and the engine control unit are properly assembled.

[0007] The present invention has been made in view of the above circumstances,
An object of the present invention is to provide an internal combustion engine capable of accurately associating an injector with an information storage medium and a method of manufacturing the same.

[0008]

According to the first aspect of the present invention, an injector for fuel injection mounted on a main body of the internal combustion engine in a one-to-one correspondence with each cylinder is provided, and control of the injector is performed. A control device that corrects parameters based on correction data corresponding to the individual injection characteristics of the injectors and controls opening and closing of the injectors, and is configured to be readable and store the correction data for the number of cylinders. The information storage medium is attached to the internal combustion engine body separately from the control device, and the control device and the information storage medium are connected by a signal line.

[0009] Since the information storage medium is attached to the internal combustion engine main body, the injector and the information storage medium can be attached substantially together in assembling the internal combustion engine main body. As a result, it is possible to prevent a mismatch between the injection characteristics of the injector and the correction data stored in the information storage medium.

According to a second aspect of the present invention, in the method for manufacturing an internal combustion engine according to the first aspect, an injection characteristic code in which the injection characteristic of the injector is coded is formed on a surface of the injector, and When assembling to the engine main body, the injection characteristic code displayed on the surface of the injector is read, correction data corresponding to the read injection characteristic code is written to the information storage medium, and the information storage medium is assembled to the internal combustion engine main body.

When the injector is assembled to the internal combustion engine main body, writing to the information storage medium can be performed together with the assembly of the injector and the information storage medium to the internal combustion engine main body. Thus, it is possible to further prevent a mismatch between the injection characteristics of the injector and the correction data stored in the information storage medium.

According to a third aspect of the present invention, in the method for manufacturing an internal combustion engine according to the first aspect, correction data corresponding to an injection characteristic of the injector is written in an information storage medium, and the injector and information corresponding to the injector are written. A storage medium and a storage medium are put together to form a component set in advance, and when the injector is mounted on the internal combustion engine main body, the information storage medium is mounted on the internal combustion engine main body.

[0013] By preparing in advance a component set of the injector and the information storage medium in which the injection characteristics and the correction data correspond correctly, writing of the correction data into the information storage medium and assembling of the injector and the information storage medium can be performed. Since the operations can be performed on separate production lines, the operation on the production line is not complicated. Thus, it is possible to further prevent a mismatch between the injection characteristics of the injector and the correction data stored in the information storage medium.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) Hereinafter, an internal combustion engine and a method of manufacturing the same according to the present invention will be described with reference to the drawings. FIG. 1 shows a schematic configuration of an automobile to which the internal combustion engine of the present invention is applied. The internal combustion engine (engine) 12 has a main body 12a and an engine control unit 5, which is a separate control device, disposed on a body 11 of an automobile. In addition to these, a fuel supply system (not shown) and the like are provided and the engine 12
Is composed. FIG. 2 shows a state in which the injector 3 is assembled in the process of assembling the engine body 12a.
This shows a state before the head cover is assembled on the cylinder block 2. The engine main body 12a has a four-cylinder configuration in which injectors 3 for supplying fuel into the cylinders are provided in one-to-one correspondence with each cylinder. is there. Injector 3
Is provided with a driving means such as a solenoid for switching between the valve opening and the valve closing, and opens by energizing the driving means as a control signal.

Another storage medium 4, which is an information storage medium, is attached to the engine body 12a. As shown in FIG. 3, the separate storage medium 4 has a memory IC 42 stored in a resin case 41 and is screwed to the engine main body 12a through a screw hole 413. The memory IC 42 has O
A PROM such as a TPROM is used and stores injector operating characteristic data as correction data. The attachment position of the separate storage medium 4 is the engine body 12a
Is set at a place where the injector 3 can be attached at the stage of attaching the injector 3. In this case, it is preferable to provide a place having good heat dissipation in consideration of heat during operation of the engine.

The case 41 of the separate storage medium 4 has a memory IC
Connector portion 4 having connection terminals 412 projecting therefrom.
The memory IC 42 and the engine control unit 5 are connected by an injector data line 61 (FIG. 1) which is a signal line. The injector data line 61 includes a power supply line, a readout line, and the like, and constitutes the wire harness 6 together with the injector drive line 62 that outputs a control signal for switching the opening and closing of the injector 3 to the injector 3.

The engine control unit 5 mainly includes a microcomputer and an input / output circuit. The engine control unit 5 outputs a control signal to the injector 3 at a predetermined time and outputs the control signal to the injector 3.
Is opened for a predetermined time, during which fuel is injected.

The output timing and time of the control signal of the injector 3 are calculated by the engine control unit 5 based on the accelerator opening and the like. At that time, the individual difference of the injector 3 is determined based on the injector operating characteristic data stored in the memory IC 42. Is corrected.

The injector operating characteristic data is, for example,
It is also possible to form a detailed map that includes the correction amount of the output timing and time, and the correction amount varies depending on the command injection amount, the magnitude of the fuel pressure, and the like according to the required injection accuracy and the like. It is.

The timing of reading the injector operating characteristic data from the memory IC 42 to the engine control unit 5 is performed, for example, after turning on by a key switch operated by the driver and before starting. Thus, even if the engine control unit 5 is separated from the engine room 111 in which the internal combustion engine main body 12a is mounted, there is no particular problem regarding the noise resistance. Injector data line 61
Needless to say, measures such as shielding may be taken.

Although the engine main body 12a and the engine control unit 5 are manufactured separately, the separate storage medium 4 is separate from the engine control unit 5, and is mounted together with the injector 3 on the production line of the engine main body 12a.

FIG. 4 shows a method of manufacturing the engine. Steps S101 to S104 are performed in the engine body 12a.
Is performed on the assembly line of the vehicle, and step S105 is performed on the assembly line of the vehicle. In the assembly line of the engine main body 12a, a large number of parts are sequentially attached to large parts such as a cylinder block, and assembling is performed. Various components are sequentially assembled to the body 11.

First, at step S101, an information code which is an injector injection characteristic code assigned to the injector 3 is read. As shown in FIG.
A connector 31 for supplying power to the solenoid and the like is provided on a base protruding from the cylinder head 2 (not shown), and an information code 301 is provided on a flat top surface of the connector 31.
Is formed. The information code 301 in the illustrated example is a kind of QR code of a two-dimensional code. The injection characteristic is measured for each injector 3 at a supply source such as a manufacturer of the injector 3 and is formed according to the result. Information code 3
01 is formed by laser marking or the like. In addition,
The formation position of the information code 301 is, for example, in the case where the connection port 311 of the connector section 31 is in the shape of the top surface,
1 side.

FIG. 6 shows a configuration of a system for reading an information code, which is a writing system for reading from an information code 301 and writing to a memory IC 42 described later. The writing system 7 mainly includes a controller 71 and a code reader 72 and a ROM writer 73.

The code reader 72 is a general handy type code reader having an optical detection unit and an operation unit for performing image processing and the like.
The information code 301 is read by approaching the injector 3 formed with the symbol 3 so as to face the injector 3 and code data is output.

The controller 71 includes the code reader 72
Connected to the injector 3 from the code reader 72.
, And outputs the code data to the writing device 73 as injector operating characteristic data. Reading of the information code 301 is performed for the number of cylinders. The injector operating characteristic data is, for example, the one read first is used for the {1 cylinder}, and then the read data {# 2 to #} in the reading order.
It is for four cylinders.

In the following step S102, the injector 3
Is assembled to the engine body 12a. As described above, the assembly corresponding to the cylinder to be assembled is attached.

In step S103, the ROM writer 73 of the writing system 7 is connected to the connector 411 of the other storage medium 4.
Is connected, and the code data is transferred from the controller 71 and written into the memory IC 42.

The separate storage medium 4 on which the writing has been completed is attached to the predetermined attachment position of the engine main body 12a in step S104.

The above procedure can be performed at a station where the injector 3 is assembled, and the writing system 7 can be used.
Will also be installed at this station.

The completed engine body 12a is paid out in a vehicle assembling process and is mounted in the engine room 111. In this vehicle assembling step, the engine control unit 5 is also attached to a predetermined place. In this state, in step S105, another storage medium 4 of the engine main body 12a and the engine control unit 5 are connected by the injector data line 61 of the routed wire harness 6. At this time, the injector 3 and the engine control unit 5 are connected by the injector drive line 62. Further, a fuel supply system or the like communicating with the fuel supply port 312 of the injector 3 is connected, and the engine 12 is completed. Further, the other parts constituting the vehicle are assembled to complete the vehicle.

According to the engine 12, since the separate storage medium 4 storing the correction data is attached to the engine main body 12a, it can be assembled in the same engine main body assembling step as the injector 3. As a result, it is possible to prevent a mismatch between the injection characteristic of the injector 3 and the correction data. According to the present manufacturing method,
When attaching the injector 3 to the engine main body 12a, writing to the separate storage medium 4 can be performed together with assembling of the injector 3 and the separate storage medium 4 to the engine main body 12a. This can further prevent the mismatch between the injection characteristics of the injector 3 and the correction data.

In the present embodiment, the injector 3 is assembled after reading the information code 301. However, the code reader 72 may take a position and a posture at which the information code 301 can be read with the injector 3 assembled. If possible, the information code 301 may be read after the injector 3 is assembled. In this case, when the information code 301 is read, the correspondence between the injector 3 and the cylinder is determined, so that it is possible to further prevent the mismatch between the injection characteristic of the injector 3 and the correction data.

After another storage medium 4 is written on the basis of the injector operating characteristic data read from the injector 3, the separate storage medium 4 is assembled to the engine body 12a. Prior to writing in another storage medium 4
May be assembled to the engine body 12a.

(Second Embodiment) FIG. 7 shows a method for manufacturing an internal combustion engine according to a second embodiment. Engine configuration is first
This is the same as the embodiment. In the figure, the same steps as those in the first embodiment are denoted by the same reference numerals, and description will be made focusing on differences from the first embodiment. Steps S201 and S202 are performed in an injector manufacturing process such as an injector maker, and steps S203 and S204 are performed in an engine body assembling process.

In step S201, the injection characteristic of each injector 3 is measured at the supply source of the injector 3, and the injector operating characteristic data corresponding to the result is obtained.
Data is written in the separate storage medium 4 for the number of cylinders per engine. Further, as shown in FIG. 8, a seal 302 indicating the cylinder number to be attached is attached to the injector 3 or is marked. The sticking of the seal 302 or the like may be performed in advance before writing to the separate storage medium 4. It should be noted that no information code is formed in the injector 3 as in the first embodiment.

In step S202, a set of parts is made by combining the injectors 3 of the number corresponding to the number of cylinders (four in the illustrated engine 12) and the separate storage medium 4 in which the injector operating characteristic data of the injectors 3 are written. .
This will be delivered to the engine body assembly line.

In step S203, the injectors 3 are assembled from the set of components into the engine body 12a in accordance with the indication of the cylinder number such as the seal 302 affixed to each injector 3.

Then, the separate storage medium 4 set with the injector 3 assembled in step S203 is assembled to the same engine body 12a.

After the engine body 12a is completed, it is paid out to the vehicle assembling step, and the separate storage medium 4 and the engine control unit 5 are connected (step S105).

In the present embodiment, the writing of the injector operating characteristic data into the separate storage medium 5 and the assembling of the injector 3 and the separate storage medium 4 can be performed on separate production lines. Does not complicate. Thus, it is possible to further prevent a mismatch between the injection characteristic of the injector 3 and the injector operation characteristic data stored in the separate storage medium 4.

In this embodiment, the separate storage medium 4 is assembled after the injector 3 is assembled. However, it is needless to say that the order may be reversed.

The other storage medium may be in the form of an IC card.

[Brief description of the drawings]

FIG. 1 is a schematic view of an automobile showing a state in which the internal combustion engine of the present invention is mounted on the automobile.

FIG. 2 is a schematic diagram of the internal combustion engine during manufacturing.

FIG. 3 is a perspective view of another storage medium constituting the internal combustion engine.

FIG. 4 is a flowchart showing a method for manufacturing the internal combustion engine of the present invention for manufacturing the internal combustion engine.

FIG. 5A is a side view of a part of an injector constituting the internal combustion engine, and FIG. 5B is a top view of the injector.

FIG. 6 is a configuration diagram of a system that reads an information code formed on the injector and writes the information code on a separate storage medium.

FIG. 7 is a flowchart illustrating a method for manufacturing the internal combustion engine according to another embodiment of the present invention.

FIG. 8 is a top view of an injector constituting the internal combustion engine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Body 111 Engine room 12 Engine (internal combustion engine) 12a Engine main body (internal combustion engine main body) 2 Cylinder head 3 Injector 31 Connector part 301 Information code (injection characteristic code) 302 Seal 4 Separate storage medium (information storage medium) 5 Engine control unit (Control device) 6 Wire harness 61 Injector data line (signal line) 62 Injector drive line 7 Correction data writing system 71 Controller 72 Code reader 73 ROM writer

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) F02M 65/00 306 F02M 65/00 306Z F-term (reference) 3G066 AA02 AD12 BA56 BA66 BA69 CC06U CD04 CD26 CE22 CE29 CE30 3G084 BA15 DA21 DA24 EB06 EB08 FA36 FA39 3G301 JA17 MA18 NC01 NC02 PE05Z PF16Z

Claims (3)

[Claims] 1. An injector for fuel injection mounted on a main body of an internal combustion engine in one-to-one correspondence with each cylinder, and control parameters of the injector are corrected based on correction data corresponding to the injection characteristics of each injector. And a control device for controlling the opening and closing of the injector, wherein an information storage medium configured to be readable and storing the correction data for the number of cylinders is provided separately from the control device. An internal combustion engine attached to an engine body, wherein the control device and the information storage medium are connected by a signal line. 2. A method for manufacturing an internal combustion engine according to claim 1, wherein an injection characteristic code obtained by coding injection characteristics of the injector is formed on a surface of the injector, and the injector is assembled to the internal combustion engine body. In this case, the injection characteristic code displayed on the surface of the injector is read, correction data corresponding to the read injection characteristic code is written to an information storage medium, and the information storage medium is assembled to the internal combustion engine body. Institution manufacturing method. 3. The method for manufacturing an internal combustion engine according to claim 1, wherein correction data corresponding to an injection characteristic of the injector is written in an information storage medium, and the injector and the information storage medium corresponding to the injector are written. A method for manufacturing an internal combustion engine, comprising: preparing a set of parts collectively in advance; and mounting the information storage medium to the internal combustion engine main body when mounting the injector to the internal combustion engine main body.