JPS58110834A - Auxiliary air control device of engine - Google Patents

Abstract

PURPOSE:To improve the reliability and durability of the titled device by a method wherein a gate valve serving as an air control valve which is provided in a bypass passage bypassing a throttle valve in an air intake passage and which is opened at the time of heating the engine is supported eccentrically and is made rotatable through the operation of a thermally expansible body. CONSTITUTION:When the engine is started while it is cold, the thermally expansible body 44 is in its non-expanded condition so that the gate vavle 32 keeps a valve hole 31 opened to the full to thereby open the bypass passage and a large quantity of auxiliary air is supplied into the engine as it bypasses the throttle valve 13. Next, when the temperature of cooling water elevates gradually and the thermally expansible body 44 within a heat sensing section 45 of an actuator 40 expands, the gate valve 32 is rotated inthe counter-clockwise direction against a spring 35 through a movable wall 42 and a rod 43 and the surface area of opening of the valve hole 31 reduces gradually. Then afterwards, when the thermally expansible body 44 expands to an excessive degree even afte the gate valve 32 is closed to the full, the valve 32 which is supported eccentrically by a support shaft 33 is rotated against only the force of the spring 35 so that the excessive expansion of the body 44 is absorbed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an auxiliary air control device that controls the amount of auxiliary air that is supplied bypassing a throttle valve in order to increase the engine rotational speed during warm-up operation.

This type of auxiliary air control device is provided with an air control valve that is opened during warm-up operation and is provided in a pinhole passage that bypasses the throttle valve and communicates with the intake passage. As this type of air control valve, a poppet valve is actuated by an actuator made of a thermally expandable body whose volume changes with heat, such as wax, which responds to engine temperature, for example, cooling water temperature. It is known to close the valve hole of SAW&.

However, the reason for using the above /'y) valve is that when the pet valve is in the fully closed position, the poppet valve itself will not be operated any more, and if the thermal expansion body of the actuator further expands in this state, the actuator will There is a risk of damaging the Yabo PET valve. For this reason, in a thermally expandable body,
A relief mechanism is provided to release the thermal deformation of the valve when it is fully closed or higher, but this relief mechanism has a complicated structure and has the disadvantage of significantly increasing costs〇 The present invention was made based on the above circumstances, and its purpose is to eliminate the need for a special relief mechanism and to prevent damage, etc. even if the thermally expandable body expands further when the valve hole is fully closed. It is an object of this invention to provide an auxiliary air control device for Ennon that can maintain a reliable closed state without causing problems.

That is, the present invention uses an e-) valve as an air control valve, and this r-t valve is rotatably supported by a shaft at a position eccentric from the valve hole of the pipe 97 passage, and The opening has a variable area and rotates around the axis when actuated by an actuator having a thermal expansion body, and by unregulating this rotation, excessive thermal expansion of the thermal expansion body is prevented. It is characterized by the fact that it does not cause damage even when it is used.

The present invention will be explained below with reference to embodiments shown in the drawings. FIG. 1 is a schematic configuration diagram of an engine equipped with an electronically controlled fuel injection device to which the present invention is applied. Engine 1 is a well-known four-cycle spark ignition engine, and fuel is supplied by an electronically controlled fuel injection device. be done.

The electronically controlled fuel injection device includes nine electromagnetic fuel injection valves 2 provided in the intake branch pipe 3, a fuel supply mechanism that supplies fuel to each injection valve 2, and an electronic control unit that controls the opening time of each injection valve 2. , 4, and an intake position needle 6 for measuring the intake air amount of the engine 1, and mainly supplies fuel to the engine 1 according to the intake air amount.

The fuel supply mechanism includes a fuel tank 6, a fuel bonder 7 that pressure-feeds fuel from the fuel tank 6, a portion of the fuel led from the fuel bonder 1, and returns a portion of the fuel to the fuel tank 6, and maintains a constant fuel supply pressure Kll! 1, and a distribution t9 that distributes fuel to each injection valve 2.

The m-child control unit 4 receives an intake air amount signal from an intake position needle 5 provided downstream of the air cleaner 10, an engine rotation speed signal from an ignition distributor 11 of the engine 1, and a signal provided in the intake passage 12. The throttle signal from the throttle valve 13 is input manually, the valve opening time of the injection valve 2 is calculated based on these signals, and a valve opening electric signal is output to the injection valve 2 via each 11L flow limiting resistor 14.

Next, the intake system of the engine 1 will be described. Main air is guided to each combustion chamber of the engine 1 through an air cleaner 10, an intake position needle 5, an intake passage 12, and an intake branch pipe 3.

Furthermore, when the engine 1 is cold started or warmed up and the throttle valve 3 is fully closed, intake air passes through the auxiliary air control device 15, bypasses the throttle valve 13, and is supplied to the engine 1. .

The E-period auxiliary air control system di 1 s is composed of an air inlet 16 located on the E flow side and opened on the E flow side of the throttle valve 13 of the intake passage 12, and an air outlet 17 located on the downstream side and opened. It is composed of a first and second passage and an air control valve 20 that changes the air communication area of this first and second passage.

Air control valve 20 is illustrated in FIGS. 2 and 3. That is, 21 is a housing, and the upper 6 intake passages 1
It is attached to the intake pipes 2 and 2 with a bolt 22, and is connected airtightly and liquidtightly by a sealing material 23. The housing 21 is closed with a cover 24, and a valve chamber 25 is formed within the housing 21. The valve chamber 25 communicates with the air inlet 16 via an inlet 26 and communicates with the air outlet 1 via an outlet 21.
7. Therefore, the inlet 16, the inlet 26
, the valve chamber 25, the outlet port 21, and the outlet port 17 form a piston passage.

A valve seat 30 is attached to the outlet 27 with a melt 51 interposed therebetween. This valve seat 30 is opened with a valve hole 31 forming a waste circular air passage, and this valve hole 31 is connected to the valve chamber 2.
5 and the outlet 21 are communicated with each other. A dart valve 32 for opening and closing the valve hole 31 is mounted on the support shaft JJ on the valve seat 30.
K is rotatably attached. r-) 32 squares
is almost fan-shaped, and its key part is the support shaft 3.
3, which is rotatably supported by the support shaft 3.
3 is offset from the position of the valve hole 31. f-) Valve 32
is provided with an opening 34 having a slightly deformed oval shape, and this opening 34 is connected to the valve seat 30Kfjl and the valve hole 3.
1 and 1 to control the air tlLIl by changing the passage area of the pi-91 passage. ? -) Valve 32 is spring 3
5 is always urged to rotate in one direction, and this r-
) When the valve 32 is pulled by the spring 35 and is in the ninth position, the opening 34 faces the valve hole 31 to fully open it.

Thermal response actuator 40 is included in Howsong 21 for ¥1
A section 36 and a cooling water introduction chamber 37 are formed. The cooling water introduction chamber 37 is communicated with the engine's wonita jacket (not shown) via a cooling water conduit 3839.
Engine coolant is now circulated through the shield. Thermal response actuator 4 attached to the storage section 36
゜ is provided with a movable @42 inside the casing 41, and this 1Tf
A rod 43 is connected to the IJJ wall 42, and a thermal expansion body 44 is filled in the space divided by the movable wall 42. The thermally expandable body 44 is made by mixing wax with a metal powder having excellent thermal conductivity, and changes its volume with heat, and may be a liquid or solid other than the wax. The peripheral wall of the thermal expansion body 44 is a heat sensitive section 45, and this heat sensitive section 45 faces into the cooling water introduction chamber 37.

Further, the tip of the lock 4s connected to the movable wall 42 is brought into contact with a protrusion 32 protruding from the latch of the f-) valve 32. In addition, 46°47.48 are respectively OIJ
Show song.

The operation of the embodiment with such a configuration will be explained.

When the engine starts to cool down, the cooling water temperature is low, so the thermal expansion body 44 is in a non-expanded state, and therefore the rod 43 is positioned further to the left in the figure than in the states shown in FIGS. 2 and 3. The r-to-valve 32 is in a position rotated more clockwise than in the illustrated position due to the suction force of the spring 35.

For this reason, the valve hole 31 of the valve seat 30 and the opening 34 of the dart valve 32 overlap, and if the valve hole 31 is replaced, the pipe 91 passage is nearly fully open and conductive, so that the valve hole 31 is closed toward the engine 1. A large amount of auxiliary air is supplied via this pinox passage. At this time, the intake needle 5 also operates, fuel is also injected into the trap air filter, and the idle speed of the engine 1 is maintained at a high level. As a result, engine 1 is
It rotates stably by overcoming the friction caused by the viscosity caused by the low temperature of the oil.

Next, after the engine 1 is started, the temperature of the engine cooling water gradually rises, and this temperature-raised cooling water is transferred to the conduit 38.3.
9 to the cooling water introduction chamber 37, the good thermal expansion body 44 is accommodated in the heat sensitive portion 45 of the actuator 40 and expanded. This expansion gradually moves the rod 43 to the right in FIGS. 2 and 3 via the #Ib wall 42. Since the tip of the rod 43 is in contact with the protrusion 32m of the f-) valve 32, the rod 43 pushes the f-) valve 32, and therefore r-)
The valve 32 is rotated counterclockwise in FIG. 2 against the attractive force of the spring 35.

This rotation of the f-) valve 320 gradually reduces the overlapping area of the opening 34 of the r-) valve 32 and the valve hole 31 of the valve seat 30, that is, the opening area of the valve hole 31. Therefore, the passage area of the pie 91 passage is gradually reduced.

In this way, the amount of auxiliary air supplied to the engine 1 is reduced, and the idle rotation speed of the engine 1 gradually decreases to the normal idle rotation speed.

After the engine 1 is warmed up, the cooling water temperature further rises and the thermal expansion of the thermal expansion body 44 also increases, so the r-toe valve 32
1 is completely closed, thus stopping the supply of auxiliary air.

However, when the r-) valve 32 fully closes the valve hole 31 in this way, the thermal expansion body 4
If there is excessive thermal expansion, the f-) valve 32 is simply rotated counterclockwise against the attractive force of the spring 35. That is, since the r-to-valve 32 only rotates following the amount of thermal expansion of the thermal expansion body 44, excessive Wa of the thermal expansion body 44 can be avoided.
f-) is absorbed by the rotation of the valve 32. For this reason, no special release mechanism is required, and? -) There is no damage to the valve 32 or actuator 40, and f-) Even if the valve 32 is rotated excessively, the valve hole 31 is still fully closed.

In the above embodiment, an example was shown in which the present invention was applied to an engine with an electronically controlled fuel injection device, but the present invention can also be applied to an engine with a mechanically controlled fuel injection device that mechanically adjusts the fuel injection amount by the operation of the intake flit. 4 hours is possible.

In the above embodiment, engine cooling water was used as a means to expand the thermally expandable body, but the thermally expandable body may be expanded using heat generated by, for example, energizing a coil heater, positive characteristic coefficient (PTC) resistor, etc. You may also do so.

Furthermore, in this embodiment, the control valve 20 of the air control device 154↑ is integrally attached to the wall of the intake pipe near the throttle valve 137, but it may be installed in another position, such as a place where it is difficult to receive wind from the vehicle. It may be installed.

As described in detail above, the present invention is a control valve for controlling the passage area of a pinot arm passage, and the r-toe valve, which is rotated around an axis provided eccentrically from the valve hole, is heated to reduce its volume. Since the thermal expansion body is rotated in the axial direction by the thermal expansion of the thermal expansion body, the thermal expansion body does not exceed fK.
Even if the thermal expansion occurs, the valve absorbs the thermal expansion by simply rotating against the spring.This makes it especially possible to prevent damage to actuators and gate valves containing thermal expansion bodies. Since no special release mechanism is required, it has excellent advantages such as a simple configuration and low cost.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic configuration diagram showing an engine with a fuel injection device, FIG. FIG. 3 is a cross-sectional view taken along the - group line in FIG. 2. 1..., :cn)y, 12...Intake A path, 1 s.
...Throttle valve, 16...Inflow port (bypass passage)
, 11... Outlet (bypass passage), 3o... Valve seat, 3no... Valve hole (bis/fourth passage), 32... y-
4 valves, 33...support shaft, 34...opening, 35...
・Spring, 40... Actuator, 43...
Rod, 44...thermal expansion body.

Claims (1)

[Claims] A pi/arm passage is provided to bypass the throttle valve provided in the intake passage of the Ennon, and an air control valve is provided in the middle of the intake passage and the valve is opened during warm-up operation of the engine. a valve, the air control valve is rotatably supported around a shaft eccentrically positioned with respect to the valve hole of the pie-arm passage, and has an opening that changes the opening area of the valve hole. a gate valve having a gate valve; a spring that biases the dart valve to rotate in one direction so that the opening of the dart valve opens the valve hole; An auxiliary air control device for an engine, comprising an expansion body and a thermally responsive actuator consisting of a rod that converts a change in volume of the thermal expansion body into an axial displacement to rotate the valve.