JPH0435793Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is an air cleaner clogging detection device,
In particular, it relates to a clogging detection device that can display the clogging state of an air cleaner with a simple configuration.

Conventional technology The conventional air cleaner clogging detection method uses a constant negative pressure detection method that detects when the negative pressure value in the air cleaner reaches a certain level, and a method that detects when the negative pressure value in the air cleaner reaches a certain level, and a method that detects when the negative pressure value in the air cleaner reaches a certain level. Negative pressure-rotation speed comparison method that generates a clogging signal when the rotation speed signal is larger (Japanese Utility Model Publication No. 53-46409)
There is.

Problems to be Solved by the Invention The constant negative pressure detection method described above does not take into account the engine speed, and therefore does not appropriately indicate the clogging state. In addition, the negative pressure-rotational speed comparison method improves the accuracy of negative pressure measurement compared to the constant negative pressure detection method described above, but
The clogging detection device has a drawback that it has a complicated structure and cannot provide accuracy commensurate with the rising price.

Therefore, an object of this invention is to eliminate the above-mentioned drawbacks and provide a clogging detection device that can display the clogging state of an air cleaner with a simple configuration.

Means for Solving the Problem The clogging detection device of this invention consists of a negative pressure detection switch that is activated by the negative pressure in the air cleaner that is generated during operation of the internal combustion engine, and a rotation speed that is activated by the rotation of the internal combustion engine. It has a configuration in which a detection switch and an indicator lamp are connected in series.

Function When the negative pressure inside the air cleaner reaches a certain level, the negative pressure detection switch is turned on, and when the engine speed is within a certain rotation speed range, the rotation speed detection switch is turned on. When both the negative pressure detection switch and the rotation speed detection switch are turned on, an indicator lamp connected in series with them lights up, indicating to the driver whether the air cleaner is clogged.

Embodiment Hereinafter, an embodiment of this invention will be described with reference to FIGS. 1 to 5.

This devised air cleaner clogging detection device is
As shown in FIGS. 1 and 2, a negative pressure detection switch 3 is activated by the negative pressure inside the air cleaner 2 generated during operation of the internal combustion engine 1, and a rotation speed detection switch 3 is activated by the rotation of the internal combustion engine 1. A switch 4 and an indicator lamp 5 are connected in series. Negative pressure detection switch 3,
A series circuit connecting the rotation speed detection switch 4 and the indicator lamp 5 is connected to the same power source 6.

The negative pressure detection switch 3 has a normally open switch 7 that detects a first negative pressure value, and a first three-terminal switch 8 that detects a second negative pressure value higher than the first negative pressure value.
For example, as shown in FIG. 3, the negative pressure detection switch 3 includes a micro switch 22 adjacent to a diaphragm 21 that is operated by the negative pressure in the air cleaner 2 and is pressed by a spring 20. When moving against the elasticity of the spring 20, the micro switch 22 has a structure in which it can be switched in two stages at different negative pressure values. The indicator lamp 5 has a first indicator lamp 14 and a second indicator lamp 17, which will be described later, which are turned on at different rotation speeds.

As shown in Fig. 2, the rotation speed detection switch 4
has a second three-terminal switch 10 having a first common terminal 9 connected to the other end of the normally open switch 7, and a normally closed switch 12 connected to the normally open contact 11 of the second third terminal switch 10. . One end of the normally open switch 7 is connected to the power source 6 via an ignition switch 19. A normally closed contact 13 of the second three-terminal switch 10 is connected to a red first indicator lamp 14. The common terminal 15 of the first three-terminal switch 8 is
The normally closed contact 16 of the first three-terminal switch 8 is connected to the normally closed switch 12 and the second yellow indicator lamp 17
normally open contact 1 of the first three-terminal switch 8
8 is connected to the first indicator lamp 14. The first indicator lamp 14 and the second indicator lamp 17 are operated at mutually different negative pressures and rotational speeds.

In FIG. 4, the normally open switch 7 is A, the first 3
Terminal switch 8 senses the negative pressure value of B and turns on. Further, the second and third terminal switch 10 senses the rotation speed of C, and the normally closed switch 12 turns on by sensing the rotation speed of D.
The rotational speeds C and D are C when the maximum rotational speed is M.
It is set at ≒0.5M and D≒0.7M to 1M. According to this setting classification, the yellow second indicator lamp 17 indicates a slightly clogged state, and the red first indicator lamp 14 indicates a clogged state. At normal low engine speeds, the amount of air taken into the air cleaner is small, and clogging of the air cleaner does not significantly affect the pressure loss of the incoming air.
Therefore, since high accuracy is not required for clogging indication below point C, the second indicator lamp 17 is not activated.

In the above configuration, when the negative pressure value reaches A while the internal combustion engine is operating in a low rotation range due to long-term use of the air cleaner 2, the normally open switch 7 is turned on. For this reason, the power supply 6, the normally open switch 7, the second
Terminal switch 10 and red first indicator lamp 14
A current flows through the red first indicator lamp 14.
lights up, indicating to the driver that the air cleaner 2 is clogged. Thereafter, when the rotational speed increases and reaches C, the second third terminal switch 10 switches to the normally closed contact 13.
Since the switch is switched from to normally closed contact 11, the first indicator lamp 14 goes out and the second third terminal switch 1
0, current flows through the normally closed switch 12 and the yellow second indicator lamp 17, and the yellow second indicator lamp 17 lights up. In this state, when the negative pressure value reaches B, the first three terminal switch 8 is switched from the normally closed contact 16 to the normally open contact 18, so the second indicator lamp 17 goes out and the first indicator lamp 14 turns off. Light. Furthermore, when the rotational speed increases and approaches the maximum rotational speed M, the normally closed switch 12 is turned off, and both the first indicator lamp 14 and the second indicator lamp 17 are turned off.

The above embodiments of the invention can be modified.
For example, as shown in FIG. 5A, the rotation speed detection switch can be configured with a three-terminal switch 30, and the negative pressure detection switch 40 can be configured with switches 34 and 38. The three-terminal switch 30 has a common terminal 31 connected to the ignition switch 19, one terminal 32 connected to the terminal 35 of the two-pole, two-throw switch 40, and the other terminal 33 connected to the terminal 39. The terminals 36 and 41 are connected to the first indicator lamp 14
The terminal 42 is connected to the second indicator lamp 17 . Terminal 37 is an unconnected terminal. Switches 34 and 38 are switched simultaneously.

In the above configuration, when the negative pressure is low during low rotation, the contact 35 becomes the contact 37 and the contact 39 becomes the contact 4.
Connected to 1. When the negative pressure reaches A, power supply 6, ignition switch 19, common terminal 3
1. Current flows to the first indicator lamp 14 through one terminal 32 and terminals 35 and 36, and the second indicator lamp 14
lights up. When the rotational speed reaches C, the three-terminal switch 30 is switched, and current flows from the three-terminal switch 30 to the second indicator lamp 17 through the contacts 39 and 41, so the first indicator lamp 14 goes out.
The second indicator lamp 17 lights up. Here, when the negative pressure rises to B, the switch 38 switches between terminals 39 and 4.
1 is switched to connect, the second indicator lamp 17 goes out and the first indicator lamp 14 lights up.

FIG. 5B shows yet another embodiment. In this example, the negative pressure detection switch can be configured with a three-terminal switch 50, and the rotation speed detection switch can be configured with a double pole double throw switch 60. The three-terminal switch 50 has a common terminal 51 connected to the ignition switch 19.
, one terminal 52 connected to the terminal 55 of the two-pole two-throw switch 60, and the other terminal 5 connected to the terminal 59.
It has 3. The terminal 56 is connected to the first indicator lamp 14 and the terminal 57 is connected to the second indicator lamp 17. Terminal 59 is an unconnected terminal. Switches 54 and 61 are switched simultaneously.

In the above configuration, when the negative pressure reaches A during low rotation, the power source 6, the ignition switch 19,
Current flows to the first indicator lamp 14 through the common terminal 51, one terminal 52, terminals 55 and 56, and the first indicator lamp 14 lights up. When the rotation speed reaches C,
Switched from terminal 56 to 57, switch 60
from the second indicator lamp 17 through contacts 55 and 57.
Since a current flows through, the first indicator lamp 14 goes out and the second indicator lamp 17 lights up. Here, when the negative pressure rises to B, the switch 50 switches to the terminal 51.
and 53, the second indicator lamp 17 goes out and the first indicator lamp 14 lights up.

Further, in FIG. 2, a two-terminal switch can be used as the three-terminal switch 8 and the second three-terminal switch 10. In this case, the first indicator lamp 1
4 and the second indicator lamp 17 can be connected in parallel to the power supply. Further, even in a range exceeding the negative pressure point B and the rotational speed D, other switches and indicator lamps can be provided to indicate the clogging state.

Effects of the invention The air cleaner clogging detection device according to this invention turns on the negative pressure detection switch when the negative pressure inside the air cleaner reaches a certain level, and when the engine rotation speed is within a certain rotation speed range. Since the number detection switch is turned on, the clogging status of the air cleaner can be displayed with a simple configuration.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the air cleaner clogging detection device of this invention, Figure 2 is a circuit diagram of the switch and indicator used in the device shown in Figure 1, and Figure 3 shows how the negative pressure detection switch is installed. The sectional view and FIG. 4 are graphs showing the relationship between the negative pressure inside the air cleaner and the engine speed, and FIGS. 5A and 5B are circuit diagrams showing other embodiments of this invention. 1... Internal combustion engine, 2... Air cleaner, 3...
Negative pressure detection switch, 4...Rotation speed detection switch,
5... Display lamp, 6... Power supply, 7... Normally open switch, 8... First 3rd terminal switch, 10... Second 3rd terminal switch, 11... Normally open contact, 12... Normally closed switch, 13... Normally closed contact, 14... First indicator lamp, 15... Common terminal, 16... Normally closed contact, 17... Second indicator lamp, 18... Normally open contact, 20... Spring, 21... ...Diaphragm, 22...Micro switch.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A negative pressure detection switch that is activated by the negative pressure in the air cleaner generated during operation of the internal combustion engine, a rotation speed detection switch that is activated by the rotation of the internal combustion engine, and an indicator lamp. Air cleaner clogging detection device connected in series. (2) Multiple series circuits connecting the above negative pressure detection switch, rotation speed detection switch, and indicator lamp,
Utility model registration claims No. 1 that are connected to the same power source and operated at different negative pressures and rotational speeds
The air cleaner clogging detection device described in (1). (3) The negative pressure detection switch has a normally open switch that detects a first negative pressure value, and a first three-terminal switch that detects a second negative pressure value that is higher than the first negative pressure value. The detection switch includes a second three-terminal switch having a first common terminal connected to the normally open switch, and a normally open switch connected to the normally open contact of the second third terminal switch. A normally closed contact of the three terminal switch is connected to a first indicator lamp, a common terminal of the first three terminal switch is connected to the normally closed switch, and a common terminal of the first three terminal switch is connected to the first three terminal switch.
A normally closed contact of the terminal switch is connected to a second indicator lamp, a normally open contact of the first three-terminal switch is connected to the first indicator lamp, and the first indicator lamp and the second indicator lamp are different from each other. An air cleaner clogging detection device as set forth in claim (1) of the utility model registration, which operates under negative pressure and rotational speed.