JPH0733810B2 - Slot valve opening detector - Google Patents

Description

The present invention relates to a throttle valve for detecting that the opening of a throttle valve provided in an intake pipe for introducing air into an automobile engine reaches a predetermined opening. The present invention relates to an opening degree detection device.

[Conventional technology]

A conventional throttle valve opening detection device is disclosed in Japanese Patent Laid-Open No. 53-13169.
As can be seen in No. 6, the rotation detection body (hereinafter referred to as "rotor") that is rotated by a lever that rotates integrally with the throttle shaft of the throttle valve has a groove that is a guide part that moves the movable contact in the radial direction. The groove is formed in the angular direction, and the groove is formed in a step shape with respect to the rotational angle direction. One fixed contact is provided on each side of the movable contact in the radial direction. This fixed contact detects that the throttle valve is in the fully closed position,
Although it detects that the throttle valve is in the fully open position, 2
It is an individual.

When the throttle valve rotates, the rotor rotates in response to this rotation. When the rotor rotates, the groove moves the movable contact in the radial direction and contacts the fixed contact to detect whether the throttle valve is fully open or fully closed.

[Problems to be solved by the invention]

However, in the above-mentioned configuration, there are three movable contacts, two fixed contacts, and a total of three contacts, so a space for accommodating these three contacts is required. It is necessary to provide two to three terminals for electrically connecting to the control circuit device (hereinafter referred to as “ECU”) to the connector provided on the throttle switch, which is high in cost and large in shape. There is a problem.

Therefore, it is an object of the present invention to provide a throttle valve opening detection device that is inexpensive, compact, and lightweight.

[Means for solving problems]

In order to solve the above-mentioned problems, in the present invention, a rotation detection body that rotates in response to opening and closing of a throttle valve, one movable contact that moves by rotation of this rotation detection body, and an arrangement that is opposed to this movable contact. One fixed contact provided between the fixed contact and the movable contact is provided at two points, a first angle at which the rotation angle of the rotation detection body is determined to be fully closed and a second angle at which the rotation angle is determined to be fully opened. A throttle switch that switches between open and closed states,
Discriminating means for discriminating the opening degree of the throttle valve by a signal related to the engine operation according to the open / closed state of the contact of the throttle switch, and a signal related to the engine operation used in the discriminating means for the engine state or the engine environment. The throttle valve opening degree detection device is provided with setting means for variably setting corresponding to.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 11 denotes a throttle valve, which is provided downstream of an air flow meter 14 of an intake pipe 13 to which an air cleaner 15 is connected. An injector 18 and an engine 17 are provided on the downstream side of the throttle valve 11. In addition, the throttle switch 12 that is linked to the throttle valve 11 is electrically EC
It is connected to U16 and transmits throttle valve opening signal S,
The ECU 16 includes an engine intake air amount Q detected by the air flow meter 14, an engine speed N, and an engine cooling water temperature.
The signal of Tw is sent in, and the timing of energizing the solenoid of the injector 18 is controlled.

The throttle switch 12 will be described with reference to FIG.

201 is a rotor made of synthetic resin such as polyamide, which rotates in conjunction with the throttle valve 11. Reference numeral 202 denotes a guide groove provided in the rotor 201, which is displaced in the radial direction with respect to its rotation angle. The radial displacement is in two stages, a predetermined angle indicating the fully open and fully closed positions of the throttle valve 11 and an intermediate angle. Reference numeral 205 denotes a substrate, on which the rotor 201 is rotatably mounted, and a through hole for allowing one end of the rotation shaft of the throttle valve 11 to which the rotation center of the rotor 201 is connected to penetrate is provided at the center thereof. . 20
6 is a fixing member made of a synthetic resin, which is fixed to the substrate 205, and members 207 and 208 for attaching the first and second contact setting leaf springs 209 and 210 are fixed by molding. One end of the first leaf spring 209 is fixed to the mounting member 208, and the other end of the first leaf spring 209 has the fixed contacts 204 for the fully closed and fully opened angular positions. The second leaf spring 210 has one end attached to the mounting member 2
It is fixed to 07, and the movable contact 203 which slides along the guide groove 202 and is displaced in the radial direction is attached to the other end. The shape of the movable contact 203 is the second leaf spring 210.
Has a cylindrical shape larger than the width thereof, and one end of the cylindrical movable contact 203 on the shaft side slides along the guide groove 202.

Next, the operation of the above structure will be described.

First, when the rotor 201 is linked to the throttle valve 11,
When the throttle valve 11 is at the fully closed position, the rotor 201 is stopped at the position shown in FIG. 3 (a), and the movable contact 203 at the tip of the leaf spring 210 is stopped at a position corresponding to the predetermined angle of the guide groove 202, so that the guide The leaf spring 210 flexes outward in accordance with the shape direction of the groove 202, and the movable contact 203 comes into contact with the fixed contact 204 to be in a closed state.

In addition, the rotor 201 is interlocked with the opening operation of the throttle valve 11.
When is rotated counterclockwise in FIG. 2, the movable contact 203 moves toward the center along the guide groove 202. In this process, if it becomes larger than a predetermined angle (eg 2 °), the movable contact
203 separates from the fixed contact 204.

Further, when the throttle valve 11 is further opened, for example, when it is rotated by 50 ° to 80 ° from the fully closed state, the rotor 201 rotates counterclockwise in conjunction with the opening of the throttle valve 11, and FIG. The position shown in b) is reached. At this time, the movable contact 203 moves in the direction away from the center along the forming direction of the guide groove 202, and the leaf spring 210 flexes outward accordingly.
Then, the movable contact 203 comes into contact with the fixed contact 204 again to be in the closed state.

In the above operation, since the movable contact 203 and the fixed contact 204 are in contact with each other at the fully open and fully closed positions of the throttle valve 11 and are in the closed state, the opening state of the throttle valve 11 in the closed state is changed. A means for discriminating is required. The determination means will be described below.

Signals such as the throttle valve opening signal S, the engine intake air amount Q, the engine speed N, and the engine cooling water temperature Tw are sent to the ECU 16. The intake air per engine revolution (hereinafter referred to as "Q / N") when the throttle valve 11 is fully closed (0 °) is as shown by the solid line in Fig. 4 (a). State (50 ° to 80 °)
It is known that the Q / N in the fully closed state (0 °) and the fully opened state (50 ° to 80 °) decreases as the engine speed N increases. As shown by the broken line in FIG. 4 (a), a setting means for presetting a comparison level A of Q / N that decreases linearly with respect to the engine speed N is provided, and the engine speed N is reduced in the closed state. If it is less than the value set at level A, the throttle valve is fully closed, and if it is more than the value set at level A, the throttle valve is fully opened.

Further, when the throttle valve 11 suddenly changes from the fully closed state to the fully opened state, the Q / N change is delayed with respect to the change in the opening degree of the throttle valve 11, as shown in FIG. When the Q / N point D corresponding to B is lower than the value set in level A, it may be judged that the throttle valve is fully closed, and the throttle valve 11 suddenly changes from the fully open state to the fully closed state. Similarly, since the point C in the fully closed state of the throttle valve is higher than the value E set in the level A at the corresponding point E in Q / N, there is a risk that it may be judged that the throttle valve is fully open, so the contact is closed. Q / N value after a lapse of a predetermined time (for example, 30 ms) from the state (points D ', E'in Fig. 5)
Is compared with the value set in level A, and the throttle valve
Judge whether it is fully closed or fully open in 11. Note that FIG. 5 shows the value set at level A as a constant value with the engine speed N fixed, but normally when the throttle valve opening suddenly opens, the engine speed N rises. Since the value set in level A becomes smaller after the rapid opening than before the rapid opening, the Q /
When N (D ') is compared with the value set at level A, it is definitely determined that the engine is fully open, and conversely, when the valve is suddenly closed, the engine speed N decreases and is regulated at level A. Since the value becomes larger after the rapid closure than before the rapid closure, it is certain that when comparing the Q / N (E '), which has become a small value as shown in the figure after the lapse of a predetermined time, with the value set at the level A. It is judged to be fully closed.

FIG. 6 shows a flow chart of an execution program when the above-mentioned means are executed by using the microcomputer in the ECU 16.

In S101, the closed state of the contacts 203 and 204 is determined. Contact 203, 2
If 04 is open, even if the throttle valve 11 is fully open,
Assuming that it is not in the fully closed state, the fully closed detection flag (FID
L) and the full open detection flag (EPSW) are both lowered in S103, and the routine proceeds to the next routine. When it is detected in S101 that it is in the closed state, the elapsed time after moving to the closed state is read in S104, and after a predetermined time has elapsed, the process proceeds to S105. In S105, the engine speed N and Q / N are read, and in S106, the value set at the level A shown by the broken line in FIG. 4 (a) is calculated corresponding to the engine speed N, and in S107. S105
Compared with the value set in level A and the Q / N read in step S106 and the value calculated in step S106.
If the Q / N is small, proceed to S108 and set the fully closed detection flag. If Q / N is larger than the value set at level A, the process proceeds to S109 to set a full open detection flag. After setting the respective detection flags, the process proceeds to the next routine.

With the above means, it is possible to determine whether the throttle valve 11 is fully closed or fully opened when the contacts are closed.

In the above embodiment, the level A is set to decrease linearly as the engine speed N increases, but as shown by the broken line in FIG. You may set it to change dynamically.

In the above-described embodiment, the throttle valve in the closed state of the contacts is Q / N, that is, the intake air amount per engine revolution.
Although it has been determined whether the valve is fully closed or fully open in 11, the pressure in the intake pipe is detected, and the comparison level F with respect to the pressure in the intake pipe is variably set with respect to the engine speed N. By comparing in the comparison step S107, the throttle valve 11
It is also possible to discriminate between fully closed and fully opened.

Further, by using the pulse width of the injection pulse signal supplied to the electromagnetic coil of the injector 18 and the same configuration as described above, it is possible to determine whether the throttle valve 11 is fully closed or fully opened.

Further, in a vehicle equipped with an air conditioner, when the compressor of the air conditioner operates, the load on the engine 17 increases. Therefore, in the idling state, the amount of air bypassing the throttle valve 11 is increased to stabilize the idling state. Therefore, Q / N becomes large. Also, when the electric load of the vehicle such as turning on the headlights is activated and becomes large, the power generation load of the alternator increases, which also causes Q /
N becomes larger. Therefore, when the compressor of the air conditioner operates or the electric load of the vehicle operates in this way, the level A may be set to be slightly higher overall.

In this setting, as shown in FIG. 8, the level A used when the compressor (electrical load) of the air conditioner is activated may be set, or a predetermined value may be added to the level A described above. Good. A flow chart in this case is shown in FIG. In FIG. 7, the data of whether the air conditioner compressor is operating or not is taken in together with the engine speed N and Q / N in S105 ′, and is set according to the intake signal of S105 ′ in S106. The calculated level A is searched and the value set at the level A corresponding to the engine speed N is calculated. Then, the same processing as in the above-described embodiment is performed to determine whether the valve is fully closed or fully open.

In the above embodiment, the comparison level A (F) of Q / N (intake pipe pressure) with respect to the engine speed N is variably set, and it is further variable corresponding to the operation of the compressor and the electric load of the air conditioner. Although it is described that the setting is performed, a variable setting corresponding to the operation of the compressor of the air conditioner or the electric load may be performed for a constant comparison level.

Although not described in the above example, when the atmospheric pressure decreases such as going to a high altitude, the Q / N and the pressure in the intake pipe decrease, so a means for detecting the atmospheric pressure is provided to detect the atmospheric pressure. However, when the atmospheric pressure decreases, the comparison level A shown in FIG. 4 (a) may be variably set according to the change in the atmospheric pressure or in a stepwise manner. In this case also, the engine speed N
In contrast, the Q / N (intake pipe pressure) comparison level A (F) was variably set, and the atmospheric pressure was also variably set. However, a constant level comparison level was variably set for atmospheric pressure. It doesn't matter.

〔The invention's effect〕

As described above, in the present invention, the rotation detecting body that rotates in response to opening and closing of the throttle valve, one movable contact that moves by the rotation of this rotation detecting body, and one fixed element that is arranged to face the movable contact. A contact point is provided, and the open / closed state between the fixed contact and the movable contact is switched at two points, a first angle at which the rotation angle of the rotation detector determines full closure and a second angle at which full rotation is determined. A throttle switch, a discriminating means for discriminating the opening degree of the throttle valve according to an open / closed state of a contact of the throttle switch by a signal relating to engine operation, and a signal relating to engine operation used by the discriminating means for indicating the engine state. Alternatively, since the throttle valve opening degree detecting device is provided with the setting means for variably setting according to the environment of the engine, one fixed contact can be deleted as compared with the conventional device. Depending on body size is smaller and lighter,
Moreover, since the structure is simplified by simply transmitting the open / closed state of the contact of the throttle switch from the throttle switch to the discriminating means, there is an excellent effect that the cost is low. In the determination of, by variably setting the signal related to the engine operation used for the determination in accordance with the engine speed state or the environment of the engine, there is a further excellent effect that the determination is accurately performed, Accurate discrimination enables reliable engine control.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an internal combustion engine in which a throttle valve opening detection device of the present invention is adopted, FIG. 2 is a front view of a throttle switch of one embodiment of the present invention, and FIG. 2 is a schematic front view showing the state of the throttle switch in the throttle valve fully closed state in FIG. 2, and FIG. 3 (b) is a schematic front view showing the state of the throttle switch in the throttle valve fully opened state in FIG. FIG. 4 shows a change in the intake air amount per one revolution of the engine when the throttle valve is fully closed with respect to the engine speed, the same change when the throttle valve is fully opened, and a comparison level A used for determining the open / closed state of the throttle valve. FIG. 5 is a time chart showing the opening and closing of the contacts of the throttle switch and the change of the intake air amount per one revolution of the engine according to the change of the opening of the throttle valve.
FIG. 6 is a flowchart of an execution program executed in the ECU having the configuration of one embodiment of the present invention, FIGS. 7 and 8.
The figure is a flow chart illustrating another embodiment of the present invention,
Also, a graph and FIG. 9 are block diagrams showing a schematic configuration of the present invention. 11 …… Throttle valve, 12 …… Throttle switch, 16 ……
ECU (electronic control circuit device), 17 ... Engine, 201 ... Rotor (rotation detector), 202 ... Guide groove (guide part), 203 ...
… Movable contact, 204 …… Fixed contact, S …… Throttle valve opening signal, Q …… Intake air amount, N …… Engine speed.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenichiro Kamai, 1-1, Showa-cho, Kariya city, Aichi Prefecture, Nihon Denso Co., Ltd. (56) References JP-A-60-183504 (JP, A)

Claims (2)

[Claims] 1. A rotation detecting body that rotates in response to opening and closing of a throttle valve, one movable contact that moves by the rotation of this rotation detecting body, and one fixed contact that is arranged opposite to this movable contact. A throttle switch that switches the open / closed state between the fixed contact and the movable contact at two points, a first angle at which the rotation angle of the rotation detection body determines whether it is fully closed and a second angle at which the rotation angle of the rotation detection body is determined to be fully open, Discriminating means for discriminating the opening degree of the throttle valve by a signal related to engine operation according to the open / closed state of the contact of the throttle switch; and a signal related to engine operation used in the discriminating means for the engine state or the engine environment. And a setting means for variably setting the throttle valve opening detection device. 2. A signal related to engine operation variably set by the setting means is variably set according to an engine speed, atmospheric pressure, a compressor operating state of an air conditioner, or an operating state of an electric load. The throttle valve opening detection device according to claim 1.