JPS6054489B2 - Throttle positioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a throttle positioner that temporarily holds a throttle valve at a position slightly open from an idling opening position during deceleration to suppress an increase in the amount of HC in exhaust gas.

If you release the accelerator pedal and suddenly close the throttle valve to the idling position while the car is running, the air supply will be rapidly reduced, and the increased intake air will be Due to the negative pressure in the intake pipe, fuel adhering to the intake pipe rapidly evaporates and is sucked into the engine cylinder, causing incomplete combustion of the rich air-fuel mixture, and a large amount of HC is discharged into the exhaust system. cause problems.

To deal with this problem, when the throttle valve is suddenly closed while the engine is running, a diaphragm device that is generally operated by negative pressure in the intake pipe is used to open the throttle valve slightly from the idling opening position. position,
That is, the throttle valve is held at the control opening position during deceleration, and the throttle valve is then closed to the idling opening position. Various so-called throttle positioners have been proposed in the past.
One of the basic components of a throttle positioner is a throttle lever fixed to the throttle shaft of a throttle valve, and a throttle lever that abuts and engages with the throttle lever to prevent the throttle valve from returning to the idling opening position. a stopper element that moves between a first position that ensures that the throttle valve opens by a predetermined amount above the controlled opening during deceleration, and a second position that allows the throttle valve to return to the idling opening position; When negative pressure is applied to the diaphragm chamber, the stopper element is moved to the first position against the spring force, and when no negative pressure is applied, the stopper element is moved to the second position by the spring force. a diaphragm device that is located upstream of the throttle valve at the position of the control opening during deceleration, and a diaphragm device that is located downstream of the throttle valve when the throttle valve is opened beyond the control opening during deceleration. A throttle position comprising a pressure take-off boat, a conduit connecting the intake pipe negative pressure take-off boat and the diaphragm chamber of the diaphragm device, and a throttle element provided in the middle of the conduit to throttle the airflow flowing therethrough. Jonah is known.

The basic operation of the throttle positioner having such a configuration is to operate the diaphragm device by the negative pressure that appears in the intake pipe negative pressure take-out boat when the throttle valve is opened beyond the control opening during deceleration. When the stopper element is moved to the first position and the throttle valve is returned to the idling opening position, the stopper element in the first position temporarily opens the throttle valve under deceleration control. From this point on, the intake pipe negative pressure take-off boat is located upstream of the throttle valve, so atmospheric pressure is gradually introduced into the diaphragm chamber of the diaphragm device via the throttle element. The stopper element gradually moves from the first position to the second position at a speed set according to the degree of aperture of the throttle element, and after a predetermined period of time, the throttle valve is closed. is designed to be returned to the idling opening.

In the throttle positioner having such a configuration, the throttle valve immediately starts returning to the idling opening position from the moment it is held at the deceleration control opening, so the throttle valve is controlled to the most preferable deceleration control. The opening cannot be maintained constant for a predetermined period of time.

By increasing the degree of restriction of the throttle element, it is possible to maintain the throttle valve at a substantially constant opening for a considerable period of time, but in this case, the entire time it takes for the throttle valve to return to its idling opening becomes too long, causing problems such as poor engine brake effectiveness. The present invention provides a throttle positioner using negative pressure taken out from an intake pipe negative pressure takeout boat whose opening and closing are controlled by a throttle valve according to its position, as in the above-mentioned conventional throttle positioner. A throttle positioner configured to automatically control the throttle positioner, which maintains the throttle valve at the most preferable control opening during deceleration over a relatively long period of time without lengthening the entire operating time of the throttle positioner. The purpose is to provide a throttle positioner that can

According to the present invention, the purpose is to abut and engage a throttle lever fixed to a throttle shaft of a throttle valve and the throttle lever to prevent the throttle valve from returning to the idling opening position. a stopper element that moves between a first position that ensures that the opening is equal to or greater than the control opening during deceleration, which is opened by a predetermined amount, and a second position that allows the throttle valve to return to the idling opening position; , a diaphragm device that moves the stopper element to the first position by a spring force when no negative pressure is applied to the diaphragm chamber, and moves the stopper element to the second position when negative pressure is applied. , a first intake pipe negative pressure take-out boat located downstream of the throttle valve at the position of the control opening during deceleration;
a second intake pipe negative pressure take-out boat located upstream of the throttle valve at the deceleration control opening position and downstream of the throttle valve when the throttle valve is opened beyond the deceleration control opening degree; A first conduit connecting the first intake pipe negative pressure take-out boat and the diaphragm chamber of the diaphragm device, and when negative pressure is applied to the diaphragm chamber, the diaphragm chamber of the diaphragm device is connected to the atmosphere. a negative pressure control valve that is connected to the boat and shuts off the diaphragm chamber of the diaphragm device from the atmospheric boat when no negative pressure is applied; Achieved by a throttle positioner characterized by comprising a second conduit connecting the diaphragm chamber and a throttle element provided in the middle of the second conduit to throttle the airflow flowing therethrough. be done.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. 1 is a schematic diagram showing one embodiment of a throttle positioner according to the present invention shown in the accompanying drawings; FIG.

In the figure, reference numeral 1 denotes a throttle valve, which is supported by a throttle shaft 2 and rotated in a direction to open and close an intake passage 3 of the carburetor. As is well known, the opening and closing operation of the throttle valve 1 is performed by an accelerator system (not shown), and the throttle valve 1 is always flexibly moved in the closing direction by a return spring (not shown). energized. A throttle lever 4 is fixedly connected to the throttle shaft 2, and a stopper arm (
A throttle positioner arm (5) is rotatably mounted. A contact 7 having an adjusting screw portion 6 is screwed onto the throttle lever 4, and the tip of the contact 7 comes into contact with a contact surface 8 of the stopper arm 5. The stopper arm 5 contacts the throttle lever 4 when the throttle valve 1 is at or near the idling opening position, and prevents the throttle valve 1 from returning to the idling opening position, thereby opening the idle link. The throttle shaft 2 is moved from the first position, that is, the position shown in the figure, which guarantees that the opening is greater than the deceleration control opening position (opening position indicated by symbol θ6 in the figure), which is a predetermined amount wider than the opening position. Moves between the position where the throttle valve is rotated clockwise in the diagram at a predetermined angle as a rotation fulcrum and the second position that allows the throttle valve to return to the idling opening position, that is, the position shown by the solid line in the diagram. I'm starting to do that. The swinging end of the stopper arm 5 is pivotally connected to one end of a rod 11 of a diaphragm device 10 by a pivot pin 9.

The diaphragm device 10 includes a diaphragm 14 that supports the other end of the clamped end 11 and cooperates with the diaphragm casing 12 to define a diaphragm chamber 13 on the right side in the figure.
and a compression coil spring 15 that flexibly biases the diaphragm 14 toward the left side in the figure, that is, the stopper arm 5 toward the first position. The diaphragm chamber 13 is located at the idling opening position of the throttle valve 1.
The first intake pipe negative pressure take-out boat 16 located on the downstream side of
through a first conduit 25, so that negative pressure or atmospheric pressure appearing in the boat 16 can be introduced into the boat 16. The compression coil spring 15 of the diaphragm device 10 causes the throttle valve 1 to reduce the speed by resisting the spring force of the return spring, not shown, when the throttle valve 1 is closed toward the idling position. It is composed of a spring with a spring force that can be stopped at the controlled opening position,
When substantial intake pipe negative pressure is introduced into the diaphragm chamber 13 during engine operation, the diaphragm 14 is biased to the right in the figure against the spring force of the compression coil spring 15 due to the negative pressure. I'm starting to do that. The diaphragm chamber 13 of the diaphragm device 10 is connected to the negative pressure control valve 1
7, it is selectively exposed to the atmosphere. The negative pressure control valve 17 has a diaphragm 20 that cooperates with the casing 18 to define a diaphragm chamber 19 on the left side in the figure.
, a valve element 21 supported by the diaphragm 20 to open and close the atmospheric boat 23, and a compression element flexibly biasing the valve element 21 together with the diaphragm 20 to the right side in the figure, that is, to the side that closes the atmospheric boat 23. The diaphragm 20 includes a compression coil spring 22 when a substantial negative pressure is introduced into the diaphragm chamber 19.
2, the valve element 21 is moved away from the atmospheric boat 23 by shifting to the left in the figure against the action of the atmospheric boat 2.
It is configured to open 3. The atmosphere boat 23 is connected to the middle of the first conduit 25 via a conduit 25'', and when the atmosphere boat 23 is opened, the diaphragm chamber 13 is connected to the conduit 25'', the atmosphere boat 23, and the filter element. It is opened to the atmosphere after 24 hours. The diaphragm chamber 19 is located upstream of the throttle valve 1 at the deceleration control opening position, and is located downstream of the throttle valve 1 when the throttle valve 1 is opened at the deceleration control opening position or more. A second conduit 27 is connected to the tube negative pressure take-out boat 26.
The air intake pipe is connected to the air intake pipe through the air intake pipe so that negative pressure or atmospheric pressure appearing on the boat can be introduced into the air intake pipe. A delay valve device 28 is provided in the middle of the second conduit 27 for delaying the transmission of atmospheric pressure from the second intake pipe negative pressure takeoff boat 26 to the diaphragm chamber 19 and setting the throttle positioner operating time. is provided. In this embodiment, the delay valve device 28 includes a check valve 29 that only allows fluid to flow from the diaphragm chamber 19 toward the second intake pipe negative pressure extraction boat 26; It has a valve element 30 in parallel relationship, and has a second throttle element 31 in series relationship with the check valve 29. Further, in the case of this embodiment, the atmospheric boat 23 of the negative pressure control valve 17
A throttling element 32 is provided in the middle of the first conduit 25 so that atmospheric pressure is well transmitted to the diaphragm chamber 13 of the diaphragm device 10 when the first conduit 25 is opened. The throttle positioner constructed as described above operates as follows.

The throttle valve 1 is connected to the second intake pipe negative pressure take-out boat 2
When the load operation opening degree θ is opened more than 6, the second intake pipe negative pressure take-out boat 26 is located downstream of the throttle valve 1 and exerts a substantial intake pipe negative pressure. Since it passes through the first and second throttle elements 30 and 31 of the delay valve device 28, the negative pressure control valve 1 is released relatively early.
7, the diaphragm 20 is biased to the left in the figure, and the atmospheric boat 23 is opened.
At this time, therefore, the diaphragm chamber 13 of the diaphragm device 10 is open to the atmosphere, so that the stopper arm 5 is in the first position. In this state, when the accelerator pedal is released to decelerate the engine, the throttle valve 1 is rotated counterclockwise in the figure by the action of a return spring (not shown), and the throttle lever 4 is rotated counterclockwise. The contactor 7 closes when it comes into contact with the contact surface 8 of the stopper arm 5, and the so-called deceleration opening position θd is reached. It is temporarily held at the opening degree.

When the throttle valve 1 is located at the deceleration control opening position θd as described above, the second intake pipe negative pressure extraction boat 26
is located upstream of the throttle valve 1 and is exposed to atmospheric pressure. This boat extends to 26. The atmospheric pressure generated is gradually transmitted into the diaphragm chamber 19 of the negative pressure control valve 17 only through the first throttle element 30 of the delay valve device 28, and the negative pressure in the diaphragm chamber 19 eventually falls below a certain negative pressure. Then, the diaphragm 20 is biased to the right in the figure by the spring force of the compression coil spring 22, so that the atmospheric boat 23 is closed by the valve element 21. At this time, the first intake pipe negative pressure take-out boat 16 is located downstream of the throttle valve 1 and is applied with intake pipe negative pressure, so from the moment the atmospheric boat 23 of the negative pressure control valve 17 is closed, The intake pipe negative pressure is introduced into the diaphragm chamber 13 of the diaphragm device 10 through the first conduit 25, thereby causing the diaphragm 14 to compress the compression coil spring 1.
By biasing the stop element 5 to the right in the figure against the spring force of 5, the stop element 5 is moved towards the second position, allowing the throttle valve 1 to return to its idle opening position. Thus, when the throttle positioner is released and released, atmospheric pressure is introduced into the diaphragm chamber 19 of the negative pressure control valve 17, the negative pressure control valve 17 is closed, and the intake pipe negative pressure is effectively applied to the diaphragm chamber 13 of the diaphragm device 10. The operating time of the throttle positioner is determined by the degree of restriction of the first restriction element 30 which restricts the flow of air into the diaphragm chamber 19. That is,
In this case, the pressure within the diaphragm chamber 13 of the diaphragm device 10 remains substantially at atmospheric pressure until the atmospheric boat 23 of the negative pressure control valve 17 is closed.
The magnitude of the control opening degree during deceleration given to the throttle valve 1 by the stopper arm 5 is maintained almost constant;
From the moment the atmospheric boat 13 is substantially closed, a substantial negative pressure is generated within the diaphragm chamber 13, and the action of canceling the controlled opening during deceleration is started.

The speed at which the control opening during deceleration is canceled and the throttle valve is returned to the idling opening position may be set arbitrarily high. There is no need to set it as Yona's operating time. Therefore, after the throttle valve is held constant at the most preferable deceleration control opening for a relatively long period of time determined by the throttle element 30, it can be rapidly returned to the idling opening position. The second throttle element 31 of the delay valve device 28 prevents the throttle positioner from operating by preventing the intake pipe negative pressure from being transmitted into the diaphragm chamber 19 during instantaneous acceleration in order to prevent deterioration of drivability. are doing.

Note that the throttle element 32 provided in the middle of the first conduit 25 only needs to have a degree of constriction that allows the atmospheric pressure from the atmospheric boat 23 to be well transmitted to the diaphragm chamber 13 of the diaphragm device 10. The throttling element exerts a considerable delaying effect when the negative pressure appearing in the first intake pipe negative pressure extraction boat 16 is transmitted to the diaphragm chamber 13, but the rate at which this affects the set throttle positioner operating time is limited. The throttle element does not greatly control the throttle positioner operating time. In the embodiment described above, the first intake pipe negative pressure take-out boat 16 is provided so as to be located upstream of the throttle valve 1 when the throttle valve 1 is in the load operation opening position. The connecting position is not limited to this, and may be provided so as to be located downstream of the throttle valve 1 at least when the throttle valve 1 is in the idle link position.

[Brief explanation of the drawing]

The attached figure is a schematic diagram showing one embodiment of a throttle positioner according to the present invention. 1-throttle valve, 2-throttle shaft, 3-intake passage, 4-throttle lever, 5-stopper arm, 6-
Adjustment screw part, 7 - contact, 8 - contact surface, 9 - pivot pin,
10-Diaphragm device, 11-Rod, 12-Diaphragm casing, 13-Diaphragm chamber, 14-Diaphragm, 15-Compression coil spring, 16-First intake pipe negative pressure take-out boat, 17-Negative pressure control valve, 18- Casing, 19 - diaphragm chamber, 20 - diaphragm, 21
~valve element, 22~compression coil spring, 23~atmospheric boat,
24~filter element, 25~first conduit, 26~
Second intake pipe negative pressure take-out boat, 27 - second conduit, 2
8 - delay valve device, 29 - check valve, 30 - first throttle element, 31 - second throttle element, 32 - throttle element.

Claims (1)

[Claims] 1 The throttle lever 4 fixed to the throttle shaft 2 of the throttle valve 1 abuts and engages the throttle lever to prevent the throttle valve from returning to the idling opening position and decelerating the throttle valve by a predetermined amount from the idling opening position. A stopper element 5 and its diaphragm chamber 13 that move between a first position that ensures an opening greater than the idle opening and a second position that allows the throttle valve to return to the idle opening position. a diaphragm device 10 that moves the stopper element 5 to the first position by a spring force when no negative pressure is applied to the diaphragm device and moves the stopper element 5 to the second position when negative pressure is applied; A first intake pipe negative pressure outlet port 16 located downstream of the throttle valve at the position of the control opening during deceleration, and a slot valve located upstream of the throttle valve at the position of the control opening during deceleration. the second intake pipe negative pressure take-out port 26 located downstream of the second intake pipe negative pressure take-out port 26 when the port is opened at the deceleration control opening degree or more, the first intake pipe negative pressure take-out port 16, and the diaphragm of the diaphragm device. Room 1
3, and the diaphragm chamber 13 of the diaphragm device is connected to the atmospheric port 23 when negative pressure is applied to its diaphragm chamber 19, and when no negative pressure is applied, the diaphragm a negative pressure control valve 17 that isolates the diaphragm chamber 13 of the device from the atmospheric port 23; and a second negative pressure control valve that connects the second intake pipe negative pressure outlet port 26 and the diaphragm chamber 19 of the negative pressure control valve. A throttle positioner comprising a conduit 27 and a throttle element 28 provided in the middle of the second conduit 27 to throttle the airflow flowing therethrough.