JPS582439A - Accelerator pedal control device - Google Patents

Abstract

PURPOSE:To aim at improving driving performance, by regulating motion of an accelerator pedal at low speed so as not to open suddenly on and after the fixed opening of a throttle valve. CONSTITUTION:A regulating actuator 11 is installed with a bracket 10 attached to a car body 5 at the side opposite to the connected side of an accelerator wire 4 of a pedal lever 2 and connected to a solenoid-operated 3-way directional control valve 13 (selector) via an air scoop 12. The regulating actuator 11 is sectioned into two parts, one for an atmosphere chamber 17 and the other for a control chamber 16 where the actuator proper 14 is interconnected to an air scoop 12 through by means of a diaphragm 15, and at the inside of the control chamber 15, the diaphragm 15 is energized with resilience of a spring 18 while at the atmosphere chamber 17 side, a rod 19 being linked with the pedal lever 2 is fastened tight to the diaphragm 15. At this time, the rod 19 is linked with the pedal lever 2 only after it has been half-opened and then retrocedes from it. Like the above, such problems as knocking, drivability malfunction, etc., are thus solved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an accelerator pedal control device that operates an internal combustion engine carburetor for a vehicle by pressing the driver's foot. It relates to things that improve the operability of equipment and the drivability of engines.

As an example of this type of prior art, for example,
As seen in Publication No. 21, between the accelerator cable and the throttle lever of the carburetor! There are some models that are equipped with an impact member, but this is intended to improve drivability by absorbing the excessive pressing force of the accelerator pedal at the time of starting with a buffer member.

By the way, in general, internal combustion engines that use a carburetor tend to have poor fuel suction in the low-speed, high-load region, resulting in a lean air-fuel ratio, which impairs drivability, especially when the engine is rapidly accelerated and enters this region. In engines that use a distributor with mechanical ignition advance characteristics, there is a mechanical limit to the advance characteristics due to centrifugal and vacuum conditions, making it impossible to obtain characteristics at low rotation speeds, and the influence of centrifugal characteristics especially at high loads. If the ignition timing is strong, there is a marked tendency for the ignition timing to be overadvanced than the optimal ignition timing, and this will result in knocking if the engine suddenly accelerates and enters that range. This is because in high compression ratio engines that aim to improve fuel efficiency by increasing thermal efficiency, the degree of knocking becomes more pronounced as the compression ratio increases. Furthermore, in the low-speed, high-load region, the amount of intake air is small, so there is little turbulence in the air-fuel mixture in the combustion chamber (the combustion speed is slow, and therefore combustion is unstable and torque fluctuations are likely to occur).

Therefore, when the vehicle is suddenly accelerated to a low-speed, high-load region, resonance with the vehicle body tends to cause so-called car knock (vibration in the longitudinal direction of the vehicle body).

The present invention has been made in view of the above circumstances, and it restricts the rotation of the accelerator pedal at low speeds so that it does not open suddenly after a predetermined throttle valve opening, and prevents the rotation of the accelerator pedal from rapidly opening at low speeds and high load areas. It is an object of the present invention to provide an accelerator pedal control device that prevents such sudden entry, and lifts such restrictions at high speeds to ensure normal acceleration response.

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. In FIG. 1, reference numeral 1 is an accelerator pedal, and a dogleg-shaped pedal lever 2 rotates in response to foot depression with an intermediate pin 3 as a fulcrum. Accelerator wire 4 on the opposite side
One end of the accelerator wire 4 is tied and a return spring 6 is biased between it and the vehicle body 5, and the other end of the accelerator wire 4 is connected to a throttle lever 9 that operates a throttle valve 8 of a carburetor 7. .

Therefore, a regulating actuator 11 is installed in the vicinity of m1l1 by a bracket 10 attached to the vehicle body 5 on the side opposite to the side where the accelerator wire 4 is connected to the pedal lever 2, and this actuator 11 is connected to the electromagnetic type via an air passage 12. It is connected to the three-way switching valve 13.

In the regulating actuator 11, the main body 14 is the diaphragm 1.
A control chamber 16 and an atmospheric chamber 1 communicate with the air passage 12 through 5.
A spring 18 is applied to the diaphragm 15 in the control chamber 16, and a rod 19 that engages with the pedal lever 2 on the atmospheric chamber 1γ side is fixed to the diaphragm 15. Here, the rod 19 is formed with a step, and the amount of protrusion is regulated by engaging the large part 19a with the main body 14, and the pedal lever 2 is rotated to the extent that the throttle valve 8 of the carburetor 7 is opened approximately half way. Only after that, the rod 19 is engaged and retracted 1, and the fitting portion between the main body 14 and the rod 19 is covered with a dustproof boot 20.

The electromagnetic three-way switching valve 13 has a communication hole 21 connected to the air passage 12, an air hole 22 with a large opening area, an air hole 23 with a very small opening area, and a valve body 24 for switching, and has a valve body 24 for switching. The valve body 24 is moved to one side or the other by a spring 26 to connect the communication hole 21 to the atmospheric hole 22 or 23. When the engine speed is low (for example, 1000
rp11 or lower), turn it off, and if it is higher than that (1000
It is connected to the battery 28 side via a rotation sensor 27 that turns on when the rotation speed is higher than rDI.

Since the present invention is configured in this way, when the speed is low, the rotation sensor 27 is turned off and the communication hole 21 of the switching valve 13 communicates with the air hole 23 having a small opening area. The discharge of air in the control chamber 16 of 11 is restricted, and the displacement of the diaphragm 15 and the retraction of the rod 19 integrated therewith are restricted. Therefore, when the accelerator pedal 1 is depressed and the pedal lever 2 rotates, the throttle valve 8 of the carburetor 7 opens with good response without any restriction at first. . Then, when the pedal lever 2 is about half opened, the pedal lever 2 hits the rod 19, and from then on, the rotation of the pedal lever 2 and the degree of opening of the throttle valve 8 are regulated by the zero rod 19 until the throttle valve is fully opened. Therefore, when the accelerator pedal 1 is pressed slowly for acceleration, there is almost no influence from the rod 19, but when the accelerator pedal 1 is pressed suddenly and accelerated, the regulating action by the rod 19 of the pedal lever 2 becomes effective and the throttle is reduced. The valve 8 now opens slowly, thus preventing sudden acceleration.

On the other hand, in the case of high speed, the rotation sensor 27 is turned on and the switching valve 1
The communication hole 21 of No. 3 communicates with the air hole 22 having a large opening area, and the restriction of the air in the control valve 16 of the actuator 11 by the restriction is released, allowing the rod 19 to retreat without resistance. Therefore, in this state, the accelerator pedal
When the pedal lever 2 is depressed, the throttle valve 8 opens with good response in the entire range up to the throttle valve fully opening, and rapid acceleration etc. are performed, regardless of whether or not the pedal lever 2 is in contact with the rod 19.

In addition, in the above embodiment, by installing a check valve or the like in the control chamber 16 of the actuators 1 to 11 in stage I, it is possible to quickly return after acceleration at low speed, and it is possible to use not only air but also liquid. is also possible.

Another embodiment in which an electromagnetic actuator is used in place of the above-mentioned diaphragm actuator is shown in FIG. Coil 30 and plunger 2 for forcibly retracting 29
Spring 3 that causes 9 to protrude and restricts its retreat
1, and a coil 30 is connected to a rotation sensor 27 similar to the above embodiment.

Therefore, in this embodiment, when the speed is low, the actuator 1
Since the coil 30 of 1' is de-energized, the plunger 29 is projected by the spring 31 and is restricted by the spring 31 itself, so that sudden acceleration can be relieved in the same way as described above. Next, in the case of high speed, the coil 30 is energized and the plunger 29 is moved to the backward position, so that the pedal lever 2 can freely rotate without coming into contact with the plunger 29, and the carburetor throttle valve has good responsiveness as described above. Open fully.

As is clear from the above explanation, according to the present invention, in the case of sudden acceleration in a low speed region, for example, when the throttle valve is opened half way or more, the sudden opening is prevented, and the sudden acceleration region is prevented. The suction of fuel in the carburetor, the advance control of ignition timing, and the combustion in the combustion chamber of the engine are performed smoothly, and the conventional problems such as knocking and poor drivability are solved. Further, since the sudden acceleration mitigation control is performed only at low speeds and not at high speeds, problems such as poor responsiveness do not occur at high speeds.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a first embodiment of an apparatus according to the present invention, and FIG. 2 is a block diagram showing a second embodiment of the same. 1...Accelerator pedal, 2...Pedal lever, 4...
...Accelerator wire, l...Carburizer, 8...Throttle valve, 11, 11'...Regulation 7 cutuator,
13...Electromagnetic three-way switching valve, 27...times (sensor) Patent applicant Fuji Type I-Gyo Co., Ltd. Patent attorney
+4 Yuzu Susumu Figure 1

Claims (1)

[Claims] In the pedal lever of the accelerator pedal, a regulating means for regulating the rotation of the pedal lever only in a low speed range is provided so that it operates after a predetermined throttle valve opening, and when the throttle valve opens after a predetermined throttle valve opening during sudden acceleration at low speed. An accelerator pedal control device characterized in that the rotation of the pedal lever is restricted by the restriction means so as to be performed slowly.