JPH0466736A - Control system of internal combustion engine - Google Patents

Abstract

PURPOSE:To shorten a connection line and also facilitate a process of the connection by attaching an electronic controller to a throttle body, and also performing the connection of the electronic controller, to respective sensors of on engine and to an actuator by means of a printed wiring board or the like. CONSTITUTION:A Ta sensor 7 which detects the atmospheric temperature and a MAP sensor 10 which detects 8 negative pressure inside an intake pipe are arranged inside a throttle body 1, and they are attached to the throttle body 1 so that their probes are exposed upstream or downstream repeatively from a throttle valve 2. An electronic controller 11 is mounted on the throttle body 1. An Th sensor 3 which detects the opening of the throttle body 2, an injector 4, a control valve 6, the Ta sensor 7, a Tw sensor 8, a fuel pump 9 and the MAP sensor 10 are connected to the electronic controller 11, using a flexible printed wiring board.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an internal combustion engine control system, and in particular to an internal combustion engine control system comprising an internal combustion engine and its control device (electronic control device). The present invention relates to an internal combustion engine control system in which various installed sensors and actuators can be easily connected to an electronic control device.

(Prior Art) An electronic control unit installed in a vehicle having an internal combustion engine receives output signals from various sensors installed in the engine and engine peripheral equipment, and controls the upstream and downstream of the injector and throttle valve. It controls various actuators such as valves that control the opening degree of the communicating idling bypass passage, and sets the engine operating state to the optimum state.

This electronic control device is placed outside the engine room, for example, in a vehicle interior, and the electronic control device and the various sensors and actuators are connected using a wire harness.

Such an internal combustion engine control system was developed in the U.S. Pat.
No. 3672, No. 62-187294, etc.

(Problems to be Solved by the Invention) The above-mentioned conventional techniques have solved the following problems.

That is, as mentioned above, the conventional electronic control device was placed in a place other than the engine room, so the electronic control device and various sensors and actuators of the engine had to be connected using a wire harness. Assembling the internal combustion engine control system is cumbersome.

Furthermore, when connecting the wire harness, the wire harness must be routed inside the vehicle, which makes connecting the harness even more troublesome.
Assembly man-hours increase.

Furthermore, the wire harness becomes longer, resulting in an increase in weight.

The present invention has been made to solve the above-mentioned problems, and its purpose is to shorten the connection line between an electronic control device and various sensors and actuators of the engine, and to facilitate the connection. An object of the present invention is to provide an internal combustion engine control system that can control the internal combustion engine.

(Means and Effects for Solving the Problems) In order to solve the above-mentioned problems, the present invention attaches the electronic control device to the throttle body and connects the electronic control device to various sensors and actuators of the engine. The feature is that it is carried out using a printed wiring board or a flat cable.

The throttle body can be provided with various sensors and actuators for the engine, so if an electronic control device is attached to the throttle body, the electronic control device and the various sensors and actuators can be connected using a printed wiring board or flat cable. You can connect using

(Example) The present invention will be described in detail below with reference to the drawings.

FIG. 2 is a schematic diagram showing the configuration of an embodiment of the present invention.

In the figure, the air taken in from the air cleaner 24 in the direction of arrow A is converted into a mixture by the fuel injected from the injector 4 disposed in the throttle body 1 having the throttle valve 2, and further flows through the intake manifold 22. , is introduced into the engine 21.

The fuel pump 9 sucks fuel (in the direction of arrow B) from a fuel tank (not shown) and supplies it to the injector 4 via the regulator 9R. The fuel not injected from the injector 4 returns to the fuel tank via the return pipe (in the direction of arrow R).

The air-fuel mixture is combusted within the engine 21, passes through the exhaust manifold 23 (in the direction of arrow C), and is further discharged via a muffler (not shown).

The bypass passage 5 is provided so as to communicate the air flow upstream side and the downstream side of the throttle valve 2.

This bypass passage 5 controls the amount of intake air during idling, and its opening degree is controlled by a control valve 6.

Inside the throttle body 1, a Ta sensor 7 for detecting atmospheric temperature and a MAP sensor 10 for detecting negative pressure in the intake pipe are arranged. The Ta sensor 7 and the MAP sensor 10 are attached to the throttle body 1 so that their probes are exposed on the upstream and downstream sides of the throttle valve 2 in the air passage within the throttle body 1.

Further, engine cooling water is introduced into a predetermined area within the throttle body 1, and a Tw sensor 8 for detecting the temperature of the engine cooling water is provided at the introduction portion.

The throttle body 1 further includes an electronic control device 11.
or installed. And this electronic control device 11
includes a Th sensor 3 that detects the opening degree of the throttle valve 2, the injector 4, the control valve 6, the Ta sensor 7, the Tw sensor 8, the fuel pump 9, and the MAP sensor 10.
However, the flexible printed wiring board (hereinafter referred to as FP), which will be described later,
C) 50.

The electronic control device 11 includes a connector 11A.

A connector 12A of the wire harness 12 is connected to the connector IIA, and thereby a spark plug, a battery, or various data input/output devices provided on the instrument panel are connected to the electronic control unit 11.

3 is a perspective view of the throttle body 1, FIG. 1 is a view of FIG. 3 viewed from the direction of arrow E, FIG. 5 is a cutaway sectional view of the main part of FIG. 1 is a sectional view taken along line FF in FIG. 1. FIG.

In FIG. 3, a frame IB for accommodating the electronic control bag M11 is shown.
, and the lid 11Z that covers the frame IC is partially broken. In addition, in FIG. 1, the electronic control device 1
1 and the lid 11Z have been removed, and a portion of the frame IB and the frame IC have been broken. Furthermore, in FIG. 6, the 7w sensor 8 is not broken. FPC50 in Figure 1
Figure 4 shows a diagram with .

In FIG. 1 and FIGS. 3 to 6, the same reference numerals as in FIG. 2 refer to the same or equivalent parts.

As shown in FIG. 5, the throttle body 1 consists of three bodies: a lower body IX1, an intermediate member IY, and an upper body IZ. A throttle valve 2 is attached to the lower body IX, and an injector 4 is attached to the upper body IZ. This injector 4 is attached using a male screw 101 and a cap 102. In addition, in FIG. 5, the air passage in the throttle body 1 is depicted as being closed due to the arrangement of the injector 4, but in reality, in FIG. Air is allowed to pass through.

Fuel is introduced into the injector 4 via a fuel pump, regulator, and fuel passage 103 (not shown).

A Th sensor 3 is attached to the end of a shaft that supports the throttle valve 2 attached to the lower main body IX.

The lower main body IX and the upper main body IZ are connected by an intermediate member IY made of a material with relatively high heat insulation properties, such as resin.

The lower main body IX has an engine 21 (FIG. 2).
An air cleaner 24 (
(Fig. 2) is attached.

Due to the negative pressure generated by the operation of the engine 21, outside air is drawn into the throttle body 1 through the window IW formed in the upper main body IZ (in the direction of arrow G).

Although not shown in FIG. 5, the throttle body 1 includes a bypass passage 5 as described above with respect to FIG.
is formed.

Next, in FIGS. 4 and 5, a lead wire 4A of the injector 4 is drawn out and a Ta sensor 7 is attached to the frame IB formed in the upper main body IZ.

Inside the frame IC, as shown in the figure, a MAP sensor 10,
A Th sensor 3 and a 7w sensor 8 are arranged. A male thread is formed on the outer circumference of the Tw sensor 8, and as shown in FIG. 6, it is attached to the throttle body 1 by screwing into a female thread formed on the lower body IX. . Reference numeral 104 in FIG. 6 indicates the lower body I
This is a region for introducing engine cooling water into the region 104, and the 7W sensor 8 is attached so that the probe of the 7W sensor 8 is exposed within this region 104.

The frame IC is further connected to the lead cotton 9A of the fuel pump (fuel pump 9 shown in FIG. 2) and the lead of the control valve (control valve 6 shown in FIG. 2) via grommets 33 and 34. Line 6A is drawn.

Symbols 3B, 7B, 8B and IOB are Th sensor 3, Ta sensor 7.7w sensor 8 and MAP sensor 1, respectively.
0 terminal (pin).

In addition, in the frame IB of the upper main body IZ, there is an FP to be described later.
A pedestal IE and pin ID for fixing C50 are formed.

Furthermore, within the frame IC of the lower main body IX, there is an FPC50.
A female thread IG is formed for attaching.

As shown in Figure 4, various sensors 3.7.8 and 1
0 and pulling out the wires 4A, 6A, and 9A, as shown in FIG. 1, the FPC 50 is passed through the grommet 32 inserted into the hole that communicates the frame IB and the frame IC.

A plan view of this FPC 50 is shown in FIG.

A predetermined conductive pattern is formed on the FPC 50, and various sensors and actuators soldered to the FPC 50 are electrically connected to the electronic control device 11. In this FIG. 7, the above-mentioned FIG. 1, and the later-described FIG. 8, illustration of the conductive pattern is omitted.

As shown in FIG. 7, the FPC 50 has connection holes 55A to 55 for soldering the terminals and lead wires of the various sensors and actuators, as well as the electronic control device 11.
A screw hole 51 for attaching the FPC 50 to the lower main body IX and a hole 52 for fixing the FPC 50 to the upper main body IZ are provided in G and 55.

To install the FPC 50, insert the male screw 61 into the screw hole 51.
This is done by inserting the external thread 61 into the internal thread IG (FIG. 4) formed in the lower main body IX. In addition, the pin ID (Fig. 4) is attached to the hole 52.
A gap 62 is formed at the tip of the pin ID as shown in FIG. 9, and the FPC 50 is fixed. The cap 62 may be fixed by utilizing the elasticity of the cap 62, or by applying an adhesive to the pin ID and then covering the pin ID with the cap 62.

Further, as shown in FIG. 10, a convex portion II is formed at the tip of the pin ID, and a concave portion 6 is formed inside the cap 62A.
2B, and the cap 62A may be fixed to the pin 1D by fitting the convex portion II and the concave portion 62B.

Note that the FPC 50 is bent as shown in FIG. 8, for example, before or after being inserted into the grommet 32. This bending makes it easy to attach the electronic control device 11, which will be described later, and to solder the terminals and lead wires of various sensors and actuators.

After inserting FPC50 into grommet 32, bedwetting 61
Before or after fixing the FPC 50 with the cap 62, the terminals 3B, 7B, 8 of the various sensors described above are connected.
B and IOB, and the Riet wires 4A, 6A and 9A
are soldered to each of the connection holes 55A to 55G of the FPC 50.

After the above wiring and installation of FPC50 are completed (first
state shown in the figure), the assembled electronic control device 11
is placed in the frame IB and fixed to the punching frame IB, for example, by screwing. In the example shown in FIG.
A lid 11B is attached to the frame IB, and by attaching the lid 11B to the frame IB, the electronic control device 11 is attached to the upper main body IZ. Note that the reference numeral 35 in FIG. 1 is a female thread for attaching the lid 11B. Further, the lid 11B functions as a cover for the frame IB.

During this installation, lead wires (not shown) of the electronic control device 11 are drawn out into the frame IC via the grommet 32. After installing the electronic control device 11, the wire of the electronic control device 11 is inserted into the connection hole 55K of the FPC 50 and soldered. After this, using an appropriate method,
Attach the lid 112 to the opening of the frame IC.

When the assembly of the throttle body 1 is completed in this way, the throttle body 1 is connected to the intake manifold port 22 attached to the engine 21, and further,
An air cleaner 24 is attached to the throttle body 1. As a result, an engine system consisting of the engine and its control means (ie, the electronic control device 11) is completed.

Therefore, it is possible to operate the engine system before mounting the engine on the vehicle body.

Now, as shown in FIG. 11, the connections between the terminals 3B, 7B, 8B, and 10B of the various sensors and the FPC 50 are made by soldering (reference numeral 40 in the figure).
For example, as shown in FIG. 12, terminals 3B, 7B, 8B
A collar 42 may be formed or fixed on the IOB and a cap 41 may be fitted to the tip of the terminal, and the connection may be made by caulking if necessary.

Furthermore, in the above-mentioned embodiment, the electronic control device 11 was described as being disposed within the frame IB, but among the circuits constituting the electronic control device 11, a sensor (for example, a MAP sensor) disposed within the frame IC was used. It goes without saying that the portion related to the control circuit 10) may be formed on a separate substrate from the electronic control device 11 and placed within the frame IC. That is, the electronic control device may be formed on two or more substrates, and these may be arranged at different locations within the throttle body 1.

Furthermore, in the embodiment described above, the upper main body IZ to which the electronic control device 11 is attached is attached to the lower main body IX via the intermediate member IY having heat insulating properties. Such a configuration makes it difficult for engine heat to be conducted to the electronic control device 11 via the intake manifold 22.

However, such heat conduction to the electronic control device 11 can be prevented by forming the upper main body IZ or the lower main body IX itself from a material having heat insulating properties, or by forming the intake manifold 22 from a material having heat insulating properties. This can also be achieved by doing so.

Further, in this embodiment, the injector 4 is configured to inject fuel to the throttle valve 2, and the throttle valve 2 is thereby cooled by the latent heat of vaporization of the fuel. This increases the amount of heat radiated, which further contributes to preventing heat conduction to the electronic control device 11.

Of course, instead of providing the injector 4, a carburetor may be used to inject fuel into the throttle valve 2.

Furthermore, if the engine has a plurality of cylinders, only one throttle body 1 may be provided, and the air-fuel mixture passing through the throttle body 1 may be distributed using an intake manifold having a branching structure. Alternatively, the throttle body 1 may be provided for each cylinder.

Furthermore, the shape of the FPC 50 is not limited to those shown in FIGS. 7 and 8, and can be set to any shape depending on the number and layout of sensors and actuators to be connected to the FPC 50. It is natural that it will be done.

Furthermore, it goes without saying that the present invention can be applied not only to internal combustion engine control systems for automobiles, but also to internal combustion engine control systems for vehicles such as motorcycles and work vehicles.

Furthermore, in the above description, the connection between the electronic control unit 11 and the sensors and actuators was assumed to be made using FPC, but it may be made using a non-flexible printed wiring board or a flat cable. Also good.

(Effects of the Invention) As is clear from the above description, according to the present invention, the connection lines between various sensors and actuators of the engine and the electronic control device are shortened, so there is no need to route a wire harness inside the vehicle. This makes it easy to assemble the internal combustion engine control system. Furthermore, the weight of the internal combustion engine control system can be reduced. Furthermore, noise is less likely to be added to the output signal of the sensor.

Furthermore, since printed wiring boards and flat cables are used as connection lines, wiring errors are reduced and connections between the electronic control device and the sensors and actuators are facilitated.

[Brief explanation of the drawing]

FIG. 1 is a view of FIG. 3 viewed from the direction of the arrow. FIG. 2 is a schematic diagram showing the configuration of an embodiment of the present invention. FIG. 3 is a perspective view of the throttle body. FIG. 4 is a diagram with the FPC removed from FIG. 1. FIG. 5 is a sectional view of a main part of FIG. 3 viewed from the direction of arrow E. FIG. 6 is a cross-sectional view of FIG. 1 taken along line FF. FIG. 7 is a plan view of the FPC. FIG. 8 is a perspective view showing how the FPC is bent. FIGS. 9 and 10 are diagrams showing how the FPC is fixed by camping. FIG. 11 and FIG. 12 are diagrams showing a method of connecting the terminals of the sensor and the FPC. 1...Throttle body, IB, IC...frame, IX
...lower body, IY...intermediate member, IZ...upper body, 2...throttle valve, 3...Th sensor, 3B
. 7B, 8B, IOB...Terminal, 4...Injector, 4A, 6A, 9A...Leet wire, 6...Control valve,
7... Ta sensor, 8... Tw sensor, 9... Fuel pump, 10... MAP sensor, 11... Electronic control unit, 21... Engine, 22... Intake manifold, 50... ...FPC, 51...Screw hole, 52
．．・Installation is hole, 55A to 55G, 55K... Connection hole, 61... Bed, 62.62A... Cap agent Michito Hiraki and 1 other person Q month

Claims (1)

[Claims] (1) The internal combustion engine is controlled by an internal combustion engine equipped with a throttle body that accommodates a throttle valve, a sensor and an actuator attached to the internal combustion engine, and an output signal of the sensor is taken in to control the actuator. An internal combustion engine control system comprising an electronic control device, wherein the electronic control device is attached to the throttle body, and at least a portion of terminals and lead wires of the sensor and actuator are drawn into the throttle body, An internal combustion engine control system, wherein at least a portion of the terminal and lead wire drawn into the throttle body and the electronic control device are connected by a printed wiring board or a flat cable.