JPS63306936A - Constant speed control device - Google Patents

Abstract

PURPOSE:To make it possible to always perform suitable constant speed control, irrespective of the operating condition of an engine by controlling magnetic fluid in an actuator e element with the use of an exciting coil so as to move a slider in order to move a wire for driving a throttle valve. CONSTITUTION:A magnetic fluid actuator is used as an actuator for adjusting the opening degree of a throttle valve in a constant speed running device. Fur ther, an actuator element 1b1 in an actuator body 1A is constituted by charging magnetic fluid 1k1 in a resilient membrane bag. Further, an exciting coil 1f1 is arranged in the outer peripheral section of the actuator element 1b1, coaxially with the latter. When the exciting coil 1f1 is energized, since the magnetic fluid 1k1 and the actuator element 1b1 is stretched in a horizontal direction in which a magnetic field acts upon, a slider 1d1 is moved rightward by means of a spring 1c1 and is then stopped. As a result, a wire 2a for driving a throttle valve is moved rightward by a predetermined stroke.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a constant speed traveling device that uses a magnetic fluid actuator as an actuator for adjusting the throttle valve opening.

[Conventional technology]

Conventionally, in constant speed traveling systems using pneumatic actuators, engine manifold negative pressure has been used exclusively as the pneumatic pressure source.

FIG. 4 is a system block diagram showing a conventional example of this type of constant speed traveling device. In this Fig. 4, l is the diaphragm type actuator body, and the diaphragm l
a, a spring lb, an exhaust control valve 1e interposed between the negative pressure port lc and the diaphragm chamber 1g, and an intake control valve if interposed between the atmospheric port 1d and the diaphragm chamber 1g.

The wire 2a is interposed between the actuator main body 1 and the throttle link 5a, and the wire 2b is interposed between the accelerator pedal 3 and the throttle link 5b.

The throttle valve 4 is a throttle link 5a.

5b, the throttle opening degree is set to a predetermined opening degree. The throttle valve 4 is installed within the intake pipe.

The rotational speed of the engine 6 is indicated by a speedometer 7. Based on this instruction/reading value and the operation of the control panel 9, the control unit 8 controls the actuator body 1 to '7g1?' I try to do 11.

Further, the manifold negative pressure boat 10 is connected to the negative pressure port lc of the actuator 1 via a negative pressure conduit 11.

Note that 15 indicates the atmosphere.

Next, the operation of the conventional example will be described. It is now assumed that manifold negative pressure is being supplied to the negative pressure boat 1c of the actuator body 1.

When the exhaust 1111w valve 1e is turned on in this state,
Since negative pressure is supplied to the diaphragm chamber 1g, the diaphragm 1a overcomes the repulsive force of the spring 1b and is displaced in a direction that reduces the diaphragm chamber 1g, that is, to the right in FIG. 4. Therefore, the wire connected to the diaphragm la 2
a is also driven in the same direction.

On the other hand, the intake control valve If is interposed between the atmospheric port 1d and the diaphragm chamber 1g, and when it is not energized, the intake control valve is off, but when it is energized, it is turned on.
It acts to connect the diaphragm 1a to the atmosphere.

Therefore, if the exhaust control valve 1e is turned on for a certain period of time, deforms and contracts the diaphragm 1a, and then turned off, even if the exhaust control valve 1e is turned off, negative pressure remains in the diaphragm chamber 1g. Therefore, the diaphragm 1a maintains its state.

Next, when the intake control valve 1f is turned on, the atmosphere is introduced into the diaphragm chamber 1g, and the diaphragm chamber 1g
The negative pressure (residual pressure) of g disappears, and the diaphragm 1a is restored to its original position by the repulsive action of the spring 1b.

In actual control under constant speed running conditions, the exhaust control valve 1e
Since the on-time ratio of the intake control valve If is duty-controlled in accordance with the speed deviation, the diaphragm 1a is displaced in accordance with the duty ratio, and therefore the wire 2
a is also displaced in the same direction, and the throttle valve opening is controlled by the amount of displacement of the wire 2a, and the automobile is controlled to travel at a constant speed in accordance with the throttle opening.

(Problems to be Solved by the Invention) By the way, with such a constant speed running device, when the car is running on a flat road, the manifold negative pressure is high, so constant speed running is not a problem. As the engine load increases, the manifold vacuum decreases and the actuator suction force decreases, resulting in
The throttle valve opening required for constant speed driving cannot be maintained (
This may result in a situation where constant speed driving control is not fully performed.

The present invention was made to solve these problems, and an object of the present invention is to provide a constant speed traveling device with improved controllability and high stability.

[Means for solving problems]

The constant speed traveling device according to the present invention includes a magnetic fluid actuator in which a magnetic fluid is sealed in an elastic membrane body, and which contracts and expands depending on the presence or absence of excitation of a 1 hour I11 coil, and corresponds to the amount of deformation of this magnetic fluid actuator. and a spring connected via a slider that controls the opening degree of the throttle valve according to the amount of movement.

(Function) In this invention, the magnetic field acting on the magnetic fluid actuator is controlled by controlling the excitation current of the exciting coil to cause the magnetic fluid actuator to contract or expand, and the slider moves accordingly. The throttle opening degree of the throttle valve is determined according to the amount of movement.

(Embodiment) Hereinafter, an embodiment of the constant speed traveling device of the present invention will be described based on the drawings. Fig. 1 is a block diagram showing the overall configuration of one embodiment. is the same as that in FIG. 4, and instead of the diaphragm actuator 1 in FIG. 4, a magnetic fluid actuator IA is used in this FIG. 1, and the other configurations are the same as in FIG. The same parts as in Figure 4 are given the same reference numerals.

Figures 2 and 3 show the above magnetic fluid actuator IA.
FIG. 2 shows the excitation coil in a non-excited state, and FIG. 3 shows it in an energized state.

In both FIGS. 2 and 3, 1b+ is a magnetic fluid actuator element constructed by enclosing magnetic fluid 1 in an elastic membrane, and its holder side 1gg is fixed to arm 1t+. At the same time, a holder portion 1gx is held at the negative end IN+ of the slider 1d+ via a wire 1m+.

In order to apply a magnetic field to the magnetorheological fluid actuator element 1b+, an am coil 1f+ is arranged coaxially on the outer circumferential surface of the magnetorheological fluid actuator element 1b.

Also, the other end 11 of the slider 1d+. is wire 1n,
The spring IC+ is connected to one end 1h+ of the spring lc+ via the spring IC+, and the other end 1hx of the spring IC+ is fixed to the arm lig via a wire Int. Arms 1i+, 11i are fixed to fixed end 1j+.

Upper surface 1)L+, lower surface 1x of the slider ldt! are in contact with the sliding plates 1e, 1ei, respectively, and are in a slidable state. Each end of the sliding plate 1e++1et is an arm li1.
．． It is held by liz.

A wire holder 1 is attached to the upper surface side 1x+ of the slider ld.
a+ is provided. A wire 2a for driving the throttle valve is attached to this wire holder la+. The wire 2a is connected to a throttle link 5a as shown in the first figure.

Next, the operation of this magnetic fluid actuator IA will be explained. FIG. 2 shows a case where the excitation coil If is in a non-excited state, no magnetic field acts on the magnetic fluid actuator element 1b+, and the magnetic fluid 1 tries to assume a substantially spherical shape due to its surface tension. The slider ld is stretched by the contraction force of the spring 1c+ and stabilized in a substantially oval shape.

stops at a position where the contraction force of the magnetic fluid actuator element 1b+ and the contraction force of the spring 1c+ are balanced.

Therefore, the wire 2a for driving the throttle valve is also positioned at a corresponding position.

Figure 3 shows a state in which 1 ft of excitation coil is energized.Since the magnetic fluid 1 has the property of being stretched in the direction of the magnetic field, the magnetic fluid actuator element 1b+ is also stretched in the horizontal direction as shown in the figure. As a result, the slider 1d+ is driven rightward in the figure by the spring 1c+ and stops.

Therefore, the wire 2a for driving the throttle valve is also driven rightward by a predetermined stroke.

Actually, since the driving torque of this wire 2a is required,
The force balance of the magnetic fluid actuator element 1b+ is such that the slider ld is at rest at a position where the contraction force of the magnetic fluid actuator element 1b+, the contraction force of the spring IC+, and the driving force of the wire 2a are balanced. The wire 2a will be positioned.

By the way, the amount of horizontal deformation of + in the magnetic fluid 1 is proportional to the applied magnetic field until the + in the magnetic fluid 1 is saturated by the magnetic field, and within this range, the stroke of the wire 2a is proportional to the excitation current of the excitation coil lft. Almost in proportion to I! I
Im possible. Therefore, the throttle opening degree can also be controlled in proportion to the excitation current of 1 ft of excitation coil.

〔Effect of the invention〕

As explained above, this invention controls the excitation current of the excitation coil that applies a magnetic field to a magnetic fluid actuator element in which a magnetic fluid is sealed in an elastic membrane, and controls the magnetic field acting on the magnetic fluid actuator element to control the throttle. Since the opening of the throttle valve is controlled by controlling the stroke of the valve drive wire, it is also possible to perform linear control in response to the stroke excitation current, which is structurally simple and better than conventional methods. It is now possible to create a constant speed traveling device using a highly reliable actuator that does not require a negative pressure source, is independent of engine load, and has no deterioration factors such as mechanical wear, and its practical effects are extremely high. big.

[Brief explanation of drawings]

Fig. 1 is a system block diagram of an embodiment of the constant speed traveling device of the present invention, Fig. 2 is a diagram showing a specific configuration of the magnetic fluid actuator main body in the same embodiment in a state where the excitation coil is not energized, and Fig. 3 4 is a diagram showing a specific configuration of the magnetic fluid actuator body in which the excitation coil is energized, and FIG. 4 is a system block diagram of a conventional constant speed traveling device. LA...Magnetic fluid actuator, 1b+...Magnetic fluid actuator element, lc+...Spring, 1d+"/slider, 1@t+16z"" sliding plate, I
f,...Ill magnetic coil, it,,li wealth...arm, 1j+...fixed end,'la, 2b...wire, 3...accelerator pedal, 4...throttle valve, 5a , 5b... Throttle link, 6... Engine, 7... Speedometer, 8... Control unit, 9... Operation panel. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] A magnetic fluid actuator element formed by enclosing a magnetic fluid in an elastic membrane body, a spring connected to the magnetic fluid actuator element via a slider, one end of the magnetic fluid actuator element and the spring being fixed and fixed to a fixed end. a sliding plate that slidably supports the slider and is fixed to the arm, a throttle valve driving wire that is attached to the slider and controls the opening of the throttle valve, and a magnetic field applied to the magnetic fluid actuator element. A constant speed traveling device further includes a magnetic fluid actuator including an excitation coil for contracting the magnetic fluid actuator.