JPH0231718Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a switch mechanism of an idle rotation control device, that is, a device that ensures that the throttle valve position during idle rotation is automatically maintained at the optimum opening depending on the engine condition. This invention relates to a switch mechanism for an idle rotation control device used to detect the position of a plunger.

Generally, the carburetor of an internal combustion engine tends to be electronically controlled, and it is well known that various parameters such as cooling water temperature, intake pipe negative pressure, and engine speed are taken into consideration. This will be explained using the conventional device shown in FIG. In Fig. 1, reference numeral 1 denotes an intake pipe, and a throttle lever 3 integrated with a throttle valve 2 is provided inside the intake pipe, and a spring 4 is used to constantly close the throttle valve 2 around a shaft 5. force is applied to. On the other hand, a plunger (not shown) is slidably provided in the idle rotation control device 6, and a rod 7 integrally formed with the plunger projects to the outside. Then, the tip 7' of the rod 7 mentioned above comes into contact with the throttle lever 3,
This restricts the clockwise rotation of the throttle lever and determines the idle speed. In this case, the throttle valve 2 can be opened freely by operating the accelerator (not shown) regardless of the above. Further, parameters such as cooling water temperature, intake pipe negative pressure, and engine rotation speed are input to the electronic control device 8, and a control signal is given to the motor 9 according to the calculation result of each of the parameters.
This causes a plunger (not shown) in the idle rotation control device 6 to slide. Then, the rod 7 integrated with the plunger is moved in and out,
The resulting idle rotation speed is arbitrarily controlled each time according to each of the parameters. In the above control device, it is necessary for control to detect the position of the moving rod based on a control signal from the electronic control device 8 and to feed this back to the electronic control device 8. However, the idle rotation control device 6 has limited space.
Within Japan, it was quite difficult to develop this detection means.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a switch mechanism for an idle rotation control device that has an extremely simple configuration and is capable of accurate operation.

In the present invention, we focused on a plunger in the idle rotation control device that moves linearly in response to control signals from the electronic control device, and by bringing the plunger into contact with a pre-made current-carrying plate, the electricity generated at the time of contact is This method attempts to detect the rod position using signals.

Examples will be described below with reference to the drawings. Second
The figure shows an equivalent circuit of the switch mechanism according to the present invention, and FIG. 3 is a diagram showing the main part of an embodiment of the present invention.

In FIG. 2, 10 is a first plate spring-shaped
This contact point is connected to the body ground terminal 11. A second contact 12 also has a leaf spring shape and is connected to the positive power source 13. 1
Reference numeral 4 denotes a plunger, which moves as indicated by solid line arrows A and B in response to control signals from the electronic control circuit 8, as described above. Reference numeral 15 is an adjustment screw which adjusts the position of the second leaf spring contact via a recess 16. In order to improve the contact state, the first contact point 10 has a substantially horizontal protrusion from the leaf spring-like main body, and this position is used as a contact point.

FIG. 3 is a specific configuration diagram of the contact mechanism, showing only the main parts. Reference numerals 10 to 16 in the figure correspond to those in FIG. 17 is the main body of the idle rotation control device, and a plunger 14 is installed inside it.
is attached movably. A rod (not shown) is provided integrally with the plunger at an upper position and abuts against the end of the throttle lever. 18
is a spiral spring. Here, the first contact end 10' having a leaf spring shape is bent and protrudes in the moving direction of the plunger at the end of the idle rotation control device.

The operation of the switch mechanism having the above configuration will be explained. Now, when the plunger 14, which is at the stop position as shown in FIG. The first contact end 10' makes contact. However, in this state, the first and second contacts do not yet come into contact. Further, the plunger 14 descends while pressing the first contact end 10' and comes into contact with the second contact 12 for the first time. That is, rather than detecting the position where the plunger 14 contacts the first contact end 10', the position where the first contact 10 and the second contact 12 that have moved while being pressed by the plunger 14 come into contact is detected. The aim is to detect this using electrical signals. More specifically, since the contact operation is performed while receiving a load from the plunger 14, accurate position detection is possible.

FIG. 4 is a configuration diagram of another embodiment of a portion that operates a first contact having a leaf spring shape.
The difference from FIG. 3 is that the free end of the first contact, which has a leaf spring shape, is straight, and the contact pin 1
9 are brought into contact with each other, and the movement of the plunger 14 is transmitted via the contact pin 19 to a first contact having a leaf spring shape. The contact pin 19 is made of an insulating material such as nylon. Note that the operation of this embodiment is based on the third
Since this is the same as in the illustrated embodiment, the explanation will be omitted.

As explained above, according to the present invention, the plunger first contacts the first contact point in the moving direction, and contacts the second contact point while applying a load to the first contact point. Since the present invention is configured to generate an electric signal according to the present invention, it is possible to provide an accurate switch mechanism for an idle rotation control device with a simple configuration.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the operation of the idle rotation control device;
Fig. 2 is an equivalent circuit of the switch mechanism of the idle rotation control device according to the present invention, Fig. 3 is a main part configuration diagram of an embodiment of the present invention, and Fig. 4 is a part that operates the first contact having a leaf spring shape. FIG. 2 is a configuration diagram of another embodiment of the invention. 1...Intake pipe, 2...Throttle valve, 3...
...Throttle lever, 4...Spring, 5...Shaft, 6
...Idle rotation control device, 7... Rod, 7'
... Rod end, 8 ... Electronic control device, 9 ... Motor, 10 ... First contact having a leaf spring shape, 1
0'... end, 11... earth terminal, 12... second contact having a plate spring shape, 13... positive terminal, 14... plunger, 15... adjustment screw, 16... recess, 17... ...Body, 18...Spiral spring, 19...Contact pin.

Claims (1)

[Claims for Utility Model Registration] (1) A switch mechanism for an idle rotation control device that adjusts the rotation angle of a throttle lever via an idle rotation control device based on control signals from an electronic control device while taking various parameters into consideration. In,
a plunger that is inserted into the idle rotation control device main body and slides and moves in response to a control signal from the electronic control device; a first leaf spring-shaped contact connected to an external body ground terminal and formed by bending; a second leaf spring contact connected to the external positive terminal and facing the first leaf spring contact; and an adjustment screw brought into contact with the free end of the second leaf spring contact. The first leaf spring-like contact is mounted at the end of the idle rotation control device so as to protrude along the moving direction of the plunger, and the plunger applies a load to the first leaf spring-like contact while the second leaf spring-like contact is applied. A switch mechanism for an idle rotation control device characterized by opening and closing a leaf spring-like contact. (2) Idle rotation according to claim 1 of the utility model registration claim, characterized in that the free end of the first leaf spring contact is formed in a straight line and is actuated via a separately provided contact pin. Control device switch mechanism.