JPH0324576B2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application>> The present invention remotely controls the throttle valve opening via an electrical or fluid drive system based on the amount of displacement of an accelerator operator. In particular, even if an abnormality occurs in the drive system between the accelerator operator and the throttle valve, the throttle valve can be reliably moved to the specified position in conjunction with the return operation of the accelerator operator. The present invention relates to a vehicle accelerator control device that is configured to close to a closed position.

<<Prior art and its problems>> As is well known, in automobiles, the accelerator pedal and the throttle valve are directly mechanically connected by wires, links, etc., and the throttle valve is controlled by the amount of depression (displacement, stroke) of the accelerator pedal. It is configured such that the opening degree of the opening is uniquely determined.

In this mechanical accelerator system, in order to obtain a good acceleration feeling that accelerates rapidly with a slight depression of the accelerator pedal, by setting a large rate of change in the throttle valve opening relative to the amount of displacement of the accelerator pedal, it is possible to drive at a constant speed. It becomes difficult to finely control the speed of

On the other hand, if the rate of change of the throttle valve opening with respect to the displacement of the accelerator pedal is set to be small with emphasis on fine controllability during constant speed driving, the feeling of acceleration in response to pedal operation will deteriorate.

As described above, with conventional mechanical accelerator systems, it has been difficult to achieve characteristics that make the vehicle easy to drive under all driving conditions.

Therefore, the present applicant has previously filed an application for a vehicle accelerator control device that remotely controls the opening of a throttle valve through electrical or fluid control and a drive system based on the amount of displacement of the accelerator pedal. Patent application 1982-182066).

According to such a vehicle accelerator control device,
By setting the transfer function of the electrical control system or fluid control system to a desired function, or by providing multiple transfer functions and selecting them appropriately according to the operation amount or operation speed of the accelerator operator, a wide range of possibilities can be achieved. It becomes possible to always obtain optimal acceleration characteristics for the driving situation.

However, in such an electro-hydraulic controlled vehicle accelerator control device, there are various position detection elements (for example, a displacement detector of the accelerator operator) between the accelerator operator and the throttle valve. , throttle valve opening detector, etc.).
Electrical signal transmission systems and fluid control systems also have errors due to temperature or aging, so during long-term use, even when the accelerator operator is fully returned, the throttle valve There was a risk that the opening would not close to a predetermined initial opening (for example, the idle position).

<<Object of the Invention>> The object of the present invention is to prevent the accelerator from malfunctioning in the remote-controlled vehicle accelerator control device described above, even if some abnormality occurs in the control system from the accelerator operator to the throttle valve. To ensure that a throttle valve closes to its initial position in conjunction with the return operation of an operator.

<<Structure of the Invention>> The present invention provides a remote-controlled vehicle accelerator control device as described above, which reciprocates in a predetermined opening direction and closing direction on a fixed trajectory in mechanical interlocking with the opening/closing operation of a throttle valve. a valve opening display piece, which is located on the opening direction side of the valve opening display piece and is biased in the closing direction by a force sufficiently stronger than the throttle valve driving force, and the accelerator operator; A valve opening regulating piece is provided which mechanically interlocks with the acceleration/deceleration operation of the valve opening and moves to an allowable position of the valve opening indicating piece, which is determined in accordance with the amount of displacement of the accelerator operator at the time. In conjunction with the return operation of the accelerator operator, the valve opening regulating piece is moved in the closing direction by the force of the spring and pressed against the valve opening indicating piece, thereby forcing the throttle valve to a predetermined position. It was designed to close until the end.

<<Description of Embodiments>> FIG. 1 is a block diagram showing the electrical configuration of a vehicle accelerator control device according to the present invention. In the figure, the accelerator pedal (accelerator operator)
The accelerator depression amount (pedal stroke or displacement amount) 1 is converted via the pedal potentiometer 2 into an analog voltage corresponding to the pedal stroke.

The control signal generator 3 includes an A/D converter 31 that A/D converts the output voltage of the pedal potentiometer 2, and a microcomputer 32 that performs predetermined calculations based on the output of the A/D converter 31. It is comprised of a D/A converter 33 which converts the output of this microcomputer 32 into D/A and outputs the D/A converter.

Then, the microcomputer 32 has a second
A table representing the relationship between the accelerator pedal stroke and the throttle valve opening is set, such as a curve a shown by a solid line in the graph of the figure, and by referring to this table, the microcomputer 32 can adjust the pedal potentiometer. 2. Calculate the throttle valve opening corresponding to the pedal stroke detected via the A/D converter 31 and output it to the servo motor driver 4 via the D/A converter 33.

As shown in FIG. 3, the servo motor driver 4 uses the throttle valve opening detected by the valve opening potentiometer 7 attached to the shaft of the servo motor 6 for rotationally controlling the throttle valve 5 and generates a control signal. Based on the deviation of the throttle valve opening from the target value outputted from the section 3, a current for correcting this deviation is output to the servo motor 6, whereby the throttle valve 5 is controlled to be positioned at the throttle valve opening target value. Ru.

On the other hand, as shown in FIG. 3, a boss 9 is fitted into a rotary shaft 8 of a throttle valve driven by a servo motor 6 so as to be freely rotatable, and a shaft 8 is attached to the tip of the rotary shaft 8. A valve opening degree display piece 10 is fixed so as to rotate together.

Also, from the boss 9, a first
lever 11 and a fan-shaped second lever 1
2 are integrally protruded from each other, and this second
A valve opening regulating piece 13 is fixed to the lever 12 so as to come into contact with the valve opening indicating piece 10.

Therefore, the valve opening degree display piece 10 is the throttle valve 5
It is designed to reciprocate on a circular orbit in a predetermined opening direction (indicated by arrow B) and a predetermined closing direction (indicated by arrow A) in mechanically interlocked with the opening and closing operations of.

Further, the first lever 11 is equipped with a servo motor 6.
One end of a tension spring 14, which is sufficiently stronger than the driving force of The lever 12 is provided so as to extend along a guide member (not shown) formed in an arc shape near the outer periphery of the lever 12 as shown by the dotted line in the figure, and the other end is connected to the accelerator pedal 1.

Therefore, the valve opening degree regulation piece 13 is located on the opening direction side (arrow B) than the valve opening degree display piece 10 and is supported so as to be able to reciprocate around the shaft 8 while drawing a circular locus, and is It is biased in the closing direction (arrow A) via a spring 14 that is sufficiently stronger than the valve driving force, and is mechanically linked to the acceleration/deceleration operation of the accelerator pedal 1, so that the accelerator pedal at that point in time is always The valve opening indicator piece is set to move to an allowable position (indicated by curve b in FIG. 2) determined in accordance with the stroke.

In addition, in FIGS. 3 and 4, 16 is
This is an intake pipe line in which a throttle valve 5 is disposed.

In the above configuration, when the accelerator pedal 1 is depressed, the accelerator wire 15 is pulled and the second lever 12 is rotated in the opening direction (arrow A). Here, as mentioned above, the accelerator wire 1
5 is moved along an arcuate guide formed along the outer periphery of the second lever 12, so that the accelerator pedal stroke and the valve opening regulation piece 13 shown by curve b, as shown in FIG. It is not linearly proportional to the rotational position, and as shown in the figure, it changes greatly in response to changes in the pedal stroke in areas where the pedal stroke is small, and changes small in areas where the pedal stroke is large.

On the other hand, when the accelerator pedal 1 is depressed in this way, the value of the throttle valve target opening increases almost in an S-shape as shown by curve a in FIG. 2, and in this case, the control system is operating normally. As long as the target opening of the throttle valve is within valve opening rule piece 1.
The regulated opening according to 3 will not be exceeded.

In other words, if all the remote control systems from the accelerator pedal 1 to the throttle valve 5 operate normally, the opening degree of the throttle valve 5 will depend on the displacement of the accelerator pedal 1 according to the relationship shown in curve a in FIG. It is controlled accordingly and does not cause any trouble.

On the other hand, due to an abnormality in the pedal potentiometer 2, valve opening potentiometer 7, etc., or an abnormality in the servo motor 6 itself, the throttle valve may open when the accelerator pedal stroke _A1 is in the state, for example, as shown in FIG. Assume that the degree is fixed at T ₁ .

In this state, the position of the valve opening regulating piece 13 is at _T0 in response to the accelerator pedal stroke _A1 , but when the accelerator pedal is returned from this state, the pedal stroke changes from _A1 to _A2. At the time of return, the opening position of the valve opening regulating piece 13 decreases from T ₀ to T ₁ , and the actual throttle valve opening matches the position of the valve opening regulating piece 13. The force of the spring 14 presses the valve opening degree regulating piece 13 against the valve opening degree display piece 10, whereby the throttle valve 5 is forcibly closed to a predetermined initial opening degree, and the throttle valve 5 is left open. This will prevent it from happening.

Note that the initial opening degree of the throttle valve 5 mentioned above may be, for example, an opening degree corresponding to an idling state, or it may be a case where the intake pipe 16 is completely closed.

Thus, according to this embodiment, even if an abnormality occurs in the remote control system from the accelerator pedal 1 to the throttle valve 5, the throttle valve 5 can be reliably opened to the predetermined initial opening as long as the accelerator pedal is reset. As a result, the reliability of this type of vehicle accelerator control device can be significantly improved.

In the above embodiment, the valve opening degree display piece 10 is one that rotates together with the rotating shaft 8 of the throttle valve 5, and the valve opening regulating piece 13 is also rotated around the rotating shaft 8. Although shown as being fixed to the lever 12, the structure of the valve opening regulating piece and the valve opening indicating piece is not limited to this.

In short, the valve opening degree display piece may be any piece that moves back and forth in a predetermined opening direction and closing direction on a fixed trajectory in mechanical interlocking with the opening/closing operation of the throttle valve.

The valve opening regulating piece is located on the opening direction side of the valve opening indicating valve, is supported so as to be able to reciprocate on the trajectory, and is supported by a spring that is sufficiently stronger than the throttle valve driving force. a valve opening display piece that is mechanically linked to the acceleration/deceleration operation of the accelerator operator and is always determined in accordance with the amount of displacement of the accelerator operator at the time; Any structure that allows movement to the permissible position may be used.

Further, in the embodiment described above, the servo motor 6 was shown as the throttle valve driving means, but the present invention is not limited to this, and various driving mechanisms such as a stepping motor, a hydraulic actuator, and others may be employed.

Further, in the above embodiment, an accelerator pedal is shown as an accelerator operator, but this is not limited to a pedal, and it goes without saying that a manual lever or other various operators can be used depending on the type of vehicle.

Furthermore, in the embodiment described above, the microcomputer 32 was used as the control signal generating section 3, and the microcomputer 32 was set with one type of characteristic shown in the curve a in FIG. 2, but the function between the accelerator pedal stroke and the throttle valve opening The present invention is not limited to this, and various other function curves may be set, and the number of types is not limited to one, but multiple types may be provided and selected as appropriate depending on the accelerator pedal stroke, its rate of change, etc. Of course.

<<Effects of the Invention>> As is clear from the description of the embodiments above, according to the present invention, the throttle valve is remotely driven via an electrical or fluid control system based on the amount of displacement of the accelerator operator. In the vehicle accelerator control device designed as described above, even if an abnormality occurs in the control system from the accelerator operator to the throttle valve,
The throttle valve can be reliably forcibly closed to the initial position in response to the return operation of the accelerator operator, and the reliability of this type of device can be significantly improved.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the electrical configuration of the device of the present invention, Fig. 2 is a graph showing the relationship between the accelerator pedal stroke, the throttle valve opening and the valve opening regulation position, and Fig. 3 is the valve opening. FIG. 4 is a perspective view showing the specific structure of the regulating piece and the valve opening degree indicating piece, and FIG. 4 is a side view of the device shown in FIG. 3. DESCRIPTION OF SYMBOLS 1... Accelerator pedal, 2... Pedal potentiometer, 3... Control signal generator, 4... Servo motor driver, 5... Throttle valve, 6... Servo motor, 7... Valve opening potential, 8... …Axis of rotation,
9... Boss, 10... Valve opening display piece, 11... First lever, 12... Second lever, 13... Valve opening regulating piece, 14... Tension spring, 15...
Accelerator wire, 16... Suction pipe line.

Claims (1)

[Claims] 1. Throttle valve driving means for opening and closing the throttle valve so that the valve opening corresponds to a given control signal; Accelerator displacement detection means for detecting the displacement of an accelerator operator; ; control signal generating means for outputting a control signal for throttle valve opening corresponding to the output of the accelerator displacement detection means, and applying the control signal to the throttle valve driving means; mechanically interlocked with the opening/closing operation of the throttle valve; a valve opening indicator piece that reciprocates in a predetermined opening direction and a closing direction on a constant trajectory; and a valve opening indicator piece that is on the opening direction side than the valve opening indicator piece and that is lower than the throttle valve driving force. is urged in the closing direction by a sufficiently strong force, and is mechanically interlocked with the acceleration/deceleration operation of the accelerator operator,
1. A vehicle accelerator control device comprising a valve opening regulating piece that moves to a valve opening indicating piece permissible position determined in accordance with the amount of displacement of an accelerator operator at the time.