JP3778006B2 - Fuel injection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fuel injector, a fuel injection system having a code portion each seed information is recorded especially.
[0002]
[Prior art]
In recent years, as regulations on exhaust gas discharged from an engine are tightened, higher pressure of fuel injected into the engine and higher accuracy of adjustment of the fuel injection amount are required. In order to increase the pressure of the fuel and the accuracy of the injection amount, for example, the required high pressure and the higher accuracy can be realized simply by increasing the accuracy of the components of the fuel injection pump or injector constituting the fuel injection system. It is difficult. Therefore, it is considered to correct the performance of the component device by electrically controlling the component device. In this case, different operating characteristics for each individual component device are recorded as a portion of the component device as operation property data, and the operation characteristics of the component device are corrected by a control device such as an ECU using the recorded operation characteristic data. Predetermined performance is ensured.
As a method for recording the characteristics of each component device, for example, a fuel injection device disclosed in Japanese Patent Laid-Open No. 7-238857 and a fuel injector disclosed in Japanese Translation of PCT International Publication No. 2000-501155 are known.
[0003]
[Problems to be solved by the invention]
According to the fuel injection device disclosed in Japanese Patent Application Laid-Open No. 7-238857, a nonvolatile memory device is mounted on the injector, and operation characteristic data for each injector is recorded in the memory device. Further, according to the fuel injector disclosed in Japanese translation of PCT publication No. 2000-501155, a barcode is formed on the fuel injector, and operation characteristic data for each injector is recorded on the barcode. By recording different operation characteristic data for each individual in a memory device or as a bar code, the data acquisition performance is improved in an adverse environment such as surrounding oil or heat. Further, the bar code is directly engraved as in the fuel injector disclosed in JP-T-2000-501155, thereby preventing the loss of the member in which the operation characteristic data is recorded.
[0004]
However, in the case of the fuel injection device disclosed in Japanese Patent Application Laid-Open No. 7-238857, there is a problem that it is necessary to install a memory device in each injector, resulting in an increase in cost. In addition, the memory device has low heat stability, and there is a possibility that recorded data may be lost or reading performance may be deteriorated under a high temperature environment.
[0005]
On the other hand, in the case of the fuel injector disclosed in Japanese Translation of PCT International Publication No. 2000-501155, there is a problem that if the bar code is contaminated by surrounding oil or the like, the information reading performance deteriorates and accurate reading becomes difficult. In addition, depending on the portion where the barcode is formed, it is difficult to read the barcode due to the color of surrounding members.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide a fuel injection device that improves information reading performance in a bad environment without increasing the number of parts.
[0007]
[Means for Solving the Problems]
According to the fuel injection device of the first aspect of the present invention, the ground portion is a connector, and when the ground portion and the code portion are read by the optical imaging means, the gradation difference of the output digital output value is a predetermined value. The luminance difference is set so as to be larger than the size. For example, when a CCD is used as the optical imaging means, an analog electrical signal output from the CCD is converted into a digital gradation signal and output. At this time, the background portion and the code portion are set such that the difference between the luminance gradation of the portion corresponding to the background portion output from the CCD and the luminance gradation of the portion corresponding to the code portion is equal to or larger than a predetermined magnitude. The color is set. By setting the color, the code portion is clearly marked on the base portion, and the data recorded in the code portion can be read without error. Therefore, the reading performance of the data recorded in the code part can be improved even in a bad environment.
[0009]
According to the fuel injection device of the second aspect of the present invention, the base portion is made of resin. Therefore, for example, the cord part can be prevented from being lost by marking the cord part on the connector of the power supply part of the component device. Further, by selecting the color of the resin forming the base portion, the luminance difference from the formed code portion can be set to a predetermined size or more. Furthermore, by forming the cord portion with resin, the cord portion can be formed by a simple method such as laser engraving.
[0010]
According to the fuel injection device of the third aspect of the present invention, the cord portion has the QR cord. Therefore, for example, the amount of data that can be recorded is larger than that of a bar code or the like, and the occurrence of reading errors can be reduced. In addition, since the area necessary for forming the QR code is small, it is easy to secure a part for forming the QR code.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example showing an embodiment of the present invention will be described with reference to the drawings.
FIG. 2 is a schematic diagram showing a fuel injection system 1 to which a control device according to an embodiment of the present invention is applied.
The fuel injection system 1 includes a fuel tank 10, a feed pump 20, a high-pressure pump 30, a common rail 40, an injector 50 as a fuel injection device, and an ECU 60. The feed pump 20, the high pressure pump 30 and the injector 50 are control devices controlled by the ECU 60.
[0013]
Fuel supplied to the injector 50 is stored in the fuel tank 10. A feed pump 20 is provided in the fuel supply path 11 that connects the fuel tank 10 and the high-pressure pump 30. The feed pump 20 supplies the fuel stored in the fuel tank 10 to the high pressure pump 30. The feed pump 20 is controlled by the ECU 60 and adjusts the flow rate of fuel supplied to the high-pressure pump 30.
[0014]
The high-pressure pump 30 pressurizes the fuel supplied from the fuel tank 10 via the fuel supply path 11 by the feed pump 20 to a predetermined pressure. As the high-pressure pump 30, for example, a fuel injection pump that pressurizes fuel by reciprocating a plunger inside a cylinder is used. The pressurized fuel is supplied to the common rail 40. An electromagnetic valve 31 is provided on the fuel inlet side of the high-pressure pump 30. The solenoid valve 31 is controlled by the ECU 60 and controls the flow rate of fuel supplied to a fuel pressurizing chamber (not shown) of the high-pressure pump 30. The common rail 40 is a tubular member that stores pressurized fuel in an accumulated state. Fuel pipes 41 are connected to the common rail 40 according to the number of cylinders formed in the engine body 2. An injector 50 is disposed at the end of the fuel pipe 41 opposite to the common rail 40. The common rail 40 is provided with a pressure sensor 42, which detects the pressure of the fuel stored in the common rail 40 and outputs it to the ECU 60.
[0015]
The injector 50 is attached to the engine body 2 and injects pressurized fuel into a combustion chamber formed in the engine body 2. The injector 50 is provided with an electromagnetic valve 51, and the opening and closing of the electromagnetic valve 31 is controlled by the ECU 60. By controlling the solenoid valve 51, the pressure of the fuel inside the injector 50 is controlled. By controlling the pressure of the fuel inside the injector 50, the opening and closing of a needle valve (not shown) provided inside the injector 50 is controlled. Thereby, the fuel injection from the injector 50 is interrupted.
[0016]
The ECU 60 is a control device that controls the engine main body 2 and the feed pump 20, the high-pressure pump 30, and the injector 50 that constitute the fuel injection system 1. The input port of the ECU 60 includes a rotation speed sensor 61 that detects the rotation speed of the engine body 2, a phase angle sensor 62 that detects the phase angle of the crankshaft, an accelerator opening sensor 63 that detects the accelerator opening, and the common rail 40. The above-described pressure sensor 42 for detecting the pressure of the fuel stored in is connected.
[0017]
The ECU 60 detects the operating state of the engine body 2 based on output values from the rotation speed sensor 61, the phase angle sensor 62 and the accelerator opening sensor 63. The ECU 60 calculates an optimal fuel injection amount to be injected into the engine body 2 from the detected operating state. The ECU 60 controls the opening and closing of the solenoid valve 51 of the injector 50 based on the calculated fuel injection amount, and controls the injection timing and injection amount of the fuel injected from the injector 50. Further, the feed pump 20 and the electromagnetic valve 31 of the high-pressure pump 30 are controlled based on the pressure inside the common rail 40 detected by the pressure sensor 42. The ECU 60 controls the flow rate of the fuel supplied to the common rail 40 by controlling the feed pump 20 and the electromagnetic valve 31 of the high-pressure pump 30 to keep the pressure inside the common rail 40 constant. The ECU 60 has a recording unit 64. The recording unit 64 has, for example, a non-volatile memory device, and a control program for controlling the fuel injection system 1 and the engine body 2 is stored in the memory device.
[0018]
Next, the code part will be described in detail.
Here, the injector 50 will be described as an example for the sake of simplicity.
As shown in FIG. 1, a connector 53 is installed at the end of the injector 50 opposite to the injection hole 52. The connector 53 is connected to a power supply unit (not shown) for supplying power to the electromagnetic valve 51. The connector 53 is made of resin. As the resin for forming the connector 53, for example, a polyamide-based resin such as nylon is used. A cord portion 54 is formed on a connector 53 formed of resin. That is, the resin connector 53 forms the base portion.
[0019]
The cord portion 54 is directly stamped on the connector 53 which is a base portion. The code part 54 has a QR code 541 as shown in FIG. The code portion 54 is formed by a laser beam such as a YAG laser. When the cord portion 54 is formed by laser light, the cord portion 54 is formed in a lighter color than the resin color of the connector 53 when the connector 53 is formed of a dark resin. For example, when the cord portion 54 is engraved using a gray resin for the connector 53, the cord portion 54 is formed in a white color.
[0020]
When the injector 50 is assembled to the fuel injection system 1, the cord portion 54 is read by a CCD camera 71 as an optical imaging means as shown in FIG. When the code unit 54 is read by the CCD camera 71, the individual operation characteristic data of the injector 50 encoded and recorded in the code unit 54 is decoded by the processing device 80 and recorded in the recording unit 64 of the ECU 60. The The ECU 60 corrects the control program based on the individual operation characteristic data of the injector 50 recorded in the recording unit 64, and controls the electromagnetic valve 51 so that a predetermined amount of fuel is injected from the injector 50.
[0021]
As described above, the connector 53 engraved with the code portion 54 is read by the CCD camera 71. Therefore, it is necessary to prevent occurrence of reading failure by the CCD camera 71. Therefore, the colors of the cord portion 54 and the connector 53 are set so that a predetermined luminance difference is generated between the cord portion 54 and the connector 53.
[0022]
As shown in FIG. 4, when the connector 53 with the code portion 54 is read by the CCD camera 71, the analog electrical signal output from the pixel of the CCD camera 71 is converted into a digital signal by the A / D converter 72. Is done. In this embodiment, the analog electric signal input to the A / D converter 72 is converted into a 256 gray scale, that is, 8-bit digital output signal from 0 to 255, and output from the A / D converter 72. At this time, the resin colors of the code portion 54 and the connector 53 are set so that the luminance output value corresponding to the code portion 54 and the luminance output value corresponding to the connector 53 have a gradation difference of 50 or more. ing.
[0023]
In order for the gradation difference of the digital output value of the luminance between the cord portion 54 and the resin of the connector 53 to be 50 or more, the color of the resin forming the connector 53 is, for example, a dark achromatic system such as black, dark gray, or gray. The color may be set to a brown color such as brown and light brown, a green color such as green, dark green and light green, or a red color such as pink and dark red. On the other hand, as resin colors that are difficult to read by the CCD camera 71 due to a small gradation difference in luminance digital output values, blue colors such as blue and sky blue, yellow colors such as yellow and yellow brown, and light colors are used. There are bright achromatic colors such as gray.
[0024]
The code portion 54 is read by the CCD camera 71 when the fuel injection system 1 is assembled. When the code portion 54 is read by the CCD camera 71, an analog electric signal is output from the CCD camera 71. The output analog electrical signal is converted into a digital output signal by the A / D converter 72 and then processed by the processing device 80. In the processing device 80, the operation characteristic data encoded and recorded in the code portion 54 is decoded from the image of the code portion 54 read by the CCD camera 71. The decoded operating characteristic data is input to the ECU 60 and recorded in the recording unit 64. In the case of the injector 50 described above, the operating characteristic data recorded in the code portion 54 is, for example, a difference between the current application timing and the valve opening timing of the injector 50 or the fuel injection per predetermined time when the current is applied. Such as quantity. These operation characteristic data are unique to each individual injector 50. For this reason, the ECU 60 corrects the control program based on the operation characteristic data specific to each individual injector 50 and performs control suitable for each individual injector 50.
[0025]
In the feed pump 20 and the high-pressure pump 30 which are control devices constituting the engine main body 2 and the fuel injection system 1, a cord portion similar to the cord portion 54 described above is formed. Therefore, not only the injector 50 but also the operation characteristic data of the engine body 2, the feed pump 20 and the high-pressure pump 30 are recorded in the recording unit 64 of the ECU 60. Therefore, the ECU 60 is optimal in accordance with the operating state of the engine based on the input signals input from various sensors and the operation characteristic data of the control device constituting the engine body 2 and the fuel injection system 1 recorded in the recording unit 64. Execute proper control.
[0026]
As described above, according to the injector 50 constituting the fuel injection system 1 according to the embodiment of the present invention, when the cord portion 54 and the connector 53 are read by the CCD camera 71, they are output after A / D conversion. The colors of the code section 54 and the connector 53 are set so that the gradation of the luminance digital output signal has a difference of 50 or more. By setting the resin color of the cord portion 54 and the connector 53, the cord portion 54 engraved on the connector 53 can be read clearly. Therefore, it is possible to reliably read different operating characteristic data for each individual injector 50 recorded in the code section 54 regardless of the surrounding environment. Therefore, it is possible to correct the difference in the operation characteristics of each injector 50 and to perform optimal control according to the operating state of the engine.
[0027]
In one embodiment of the present invention, the cord portion 54 is directly engraved on the connector 53 made of resin by a YAG laser or the like. Therefore, formation of the code part 54 is easy, and a part for recording the operation characteristic data is not required. Therefore, the structure is not complicated and the number of parts is not increased.
[0028]
In the above-described embodiment of the present invention, an injector has been described as an example of a control device constituting the fuel injection system. However, the same effect can be obtained not only by the injector but also by other control devices such as a feed pump or a high-pressure pump constituting the fuel injection system.
[0029]
In the embodiment of the present invention, the case where the resin is used as the base portion has been described. However, it is also possible to use the base portion made of metal and form the code portion by, for example, printing by printing or printing with a paint.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an injector of a fuel injection system according to an embodiment of the present invention, in which (A) is a side view and (B) is an arrow viewed from the direction of arrow B in (A). FIG.
FIG. 2 is a schematic diagram showing a fuel injection system according to an embodiment of the present invention.
FIG. 3 is a schematic view showing a cord portion formed in an injector of a fuel injection system according to an embodiment of the present invention.
FIG. 4 is a diagram schematically showing a reading device that reads a code portion formed in an injector of a fuel injection system according to an embodiment of the present invention.
[Explanation of symbols]
1 Fuel injection system 2 Engine body 20 Feed pump (pump, control equipment)
30 High-pressure pump (pump, control equipment)
50 injectors (fuel injection devices, control equipment)
53 Connector (underground)
54 Code 60 ECU
71 CCD camera (optical imaging means)
541 QR code

Claims (3)

A connector, a fuel injection device Ru comprising a base portion and a code portion which is formed on the base portion,
When the base part and the code part are read by an optical imaging unit, the base part and the code part are a digital output value of luminance corresponding to the base part output from the optical imaging unit, and the code part A fuel injection device characterized by having a luminance difference in which a digital output value of luminance corresponding to a code portion is equal to or greater than a predetermined gradation difference. The fuel injection device according to claim 1, wherein the base portion is made of resin . The fuel injection device according to claim 1, wherein the cord portion has a QR code .

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