JPS63306935A - 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 element with the use of an exciting coil so as to rotate a pulley 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. Further, 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 1 1f1 is arranged in the outer peripheral section of the actuator element 1b1, coaxially with the latter. When the exciting coil 1f1 is turned off, due to no magnetic field action, the actuator element 1b1 is to recover its original spherical shape so as to produce a contracting force, and accordingly, a pulley 1d1 is rotated clockwise by a predetermined angle. 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 a constant speed traveling device using a pneumatic actuator, the engine manifold negative pressure has been used exclusively as an air source.

FIG. 4 is a diagram showing the configuration of a conventional constant speed traveling device of this type, and numeral 1 in the figure is an actuator body, in which a diaphragm la and a spring 1b are provided. la is pressed to the left in the figure.

Further, an exhaust control valve 1e is interposed between the negative pressure port 1c and the diaphragm chamber 5, and an intake control valve 1f is interposed between the atmospheric port 1d and the diaphragm chamber 1g.

Note that 15 indicates the atmosphere.

Between this actuator l and the throttle link 5a,
A wire 2a is interposed, and this throttle link 5
a, the throttle link 5b, and the throttle valve 4 work together to set the throttle opening to a predetermined opening. Throttle link 5b is connected via wire 2b,
It is connected to the accelerator pedal 3.

The throttle valve 4 is arranged in an intake pipe, and this intake pipe is connected to the engine 6.

The manifold negative pressure port IO is connected to the negative pressure port 1c of the actuator main body l via a negative pressure line 11.

The rotation of the engine 1 is indicated by a speedometer 7, and the control unit 8 controls the actuator body 1 in accordance with the instructions from the speedometer 7 and the operation of the operation panel 9.

Next, the operation of the conventional constant speed traveling device will be explained. It is now assumed that manifold negative pressure is being supplied to the negative pressure port 1c of the actuator 1.

In this state, when the exhaust control valve 1e is turned on, negative pressure is supplied to the diaphragm chamber 1g, so the diaphragm 1a overcomes the repulsive force of the spring 1b and moves in the direction of contracting the diaphragm chamber 1g, that is, as shown in the figure. The wire 2a supplied to the diaphragm la is displaced in the right direction.
are also driven in the same direction.

On the other hand, the intake control valve 1f is interposed between the atmospheric pressure chamber 1d and the diaphragm chamber 1g, and when it is not energized, the intake control valve 1f is off, but when it is energized, it is turned on and the diaphragm 1a is turned on. It acts as if it were conductive to the atmosphere.

Therefore, if the exhaust control valve 1e is turned on for a certain period of time and then turned off after deforming and contracting the diaphragm 1a, negative pressure will still exist as residual pressure in the diaphragm chamber 1g even if the exhaust control valve 1e is turned off. Therefore, diaphragm 1
a will maintain 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 in a constant speed running state, the duty ratio of the ON time of the exhaust control valve 1e and the intake control valve 1f is changed according to the speed deviation, so the diaphragm 1a is displaced according to the duty ratio. Therefore, the wire 2a is also displaced in the same direction, and the opening degree of the throttle valve 4 is controlled by the amount of displacement of the wire 2a.
The vehicle is controlled to travel at a constant speed in accordance with the throttle opening.

[Problem that the invention seeks to solve]

By the way, with such a constant speed driving device, when the car is driving on a flat road, the manifold negative pressure is high, so there is no problem with constant speed driving control, but for example, when the car approaches an uphill road,
When the engine load increases, the above-mentioned manifold negative pressure decreases, and the suction force of the actuator decreases, resulting in the inability to maintain the throttle valve opening required for constant speed travel (and the constant speed travel control becomes complete). There may be cases where you are unable to become

This invention was made in order to solve these problems, and it enables linear stroke control of the wire for driving the throttle valve, has a simple structure, and also enables the use of a high-end actuator. The purpose is to obtain a constant speed traveling device using the following methods.

[Means for solving problems]

The constant speed traveling device according to the present invention is made of an elastic membrane sealed with a magnetic fluid, and includes an actuator element connected to a wire for driving a throttle valve, and an excitation coil that applies a magnetic field to the actuator element. It is something.

[For production]

In this invention, when the excitation coil is in the energized state, a magnetic field acts on the actuator element, and the magnetic fluid is deformed to extend in the length direction to position the wire in a fixed position, and the excitation coil is brought into the de-energized state. Then, the magnetic fluid contracts and controls the opening of the throttle valve to a predetermined opening via the wire.

〔Example〕

Embodiments of the constant speed traveling device of the present invention will be described below with reference to the drawings. FIG. 1 is a system block diagram showing the overall configuration. In the illustrated state, it is the same as FIG. 4 except that a pulley 1d+ is added to the magnetic fluid actuator main body IA. Identical parts will only be given the same reference numerals. In this embodiment, the magnetic fluid actuator body IA is different from that shown in FIG. 4, and its specific structure is shown in FIGS. 2 and 3.

Figure 2 shows the case where the excitation coil is excited, and the third
The figure shows a case where the excitation coil is in a non-excited state. In FIGS. 2 and 3, the actuator element 1b+ of the magnetic fluid actuator main body IA is constructed by enclosing a magnetic fluid 1 in an elastic membrane.

The holder part 1gt of the actuator element 1b is supported by the fixed end 1j+, and the holder part 1gt of the actuator element 1b+ is supported by the fixed end 1j+.
The other end 1g+ is connected to one end of the wire 1e+. The wire let is wound around the pulley 1d+. The other end of this wire le is connected to a holder portion 1h+ of a spring 1c+. Spring 1c+
The other end 1ht of is fixed to the fixed end 1j+.

An excitation coil 1ft is disposed coaxially with the actuator element 1b outside the outer periphery of the actuator element 1b, so that the excitation current is turned on and off.

Further, the pulley 1d+ is held at one end of the arm lit, and the arm 1il is fixed to the fixed end 1j+. This pulley 1d+ is rotatably driven by a wire 1el.

A reel lal for driving the throttle valve is provided on the negative side of the pulley 1d+. This reel 1a
One end of the wire 2a is connected to +. wire 2a
The other end is connected to the throttle link 5a as shown in FIG.

The wire 2a is inserted into the notch 1ml of this reel 1a+.
Rondo insertion hole 11 for inserting and fixing the tip end rod 2a+
．． is provided.

Next, the operation of this magnetic fluid actuator I will be explained. Figure 3 shows a case where the excitation coil 1f+ is in an excited state, and in this case, a magnetic field acts on the actuator element 1b+, so that the magnetic fluid 1 + tends to assume a substantially spherical shape due to its surface tension in the non-excited state. However, under the action of a magnetic field, the pulley 1d+ is deformed in shape as if being stretched in its length direction, and its approximately oval shape balances the contractile force of the spring 1c+ and stabilizes, so the pulley 1d+ stops at the equilibrium position shown in the figure. . Therefore, the wire 2a for driving the throttle valve is also positioned at a corresponding position.

Figure 3 shows the off state of the excitation coil If.
Since the actuator element 1bt is not subjected to an acting magnetic field, a contractile force is generated in an attempt to restore its shape to a substantially spherical shape, so that the pulley ld is rotated clockwise by 45 degrees as shown in the figure and then stops.

Therefore, the wire 2a is also driven rightward by a predetermined stroke. Actually, since the driving torque of the wire 2a is required, the force balance of the actuator element 1b is achieved by the pulley at a position where the contractile force of the magnetic fluid actuator lb+, the contractile force of the spring 1c, and the tension of the wire 2a are balanced. 1d+ is stationary, and the wire 2a is positioned accordingly.

By the way, the amount of horizontal deformation of the excitation fluid 1 + is approximately proportional to the applied magnetic field until the excitation fluid 1 + is saturated by the magnetic field, so within this range the stroke of the wire 2a is approximately equal to 1 ft of the excitation coil. It can be controlled almost in proportion to the excitation current.

(Effects of the Invention) As explained above, the present invention comprises a magnetic fluid actuator body by arranging an exciting coil coaxially with an actuator element in which a magnetic fluid is sealed in an elastic film body, and controls the exciting current of the exciting coil. However, by controlling the magnetic field that acts on the actuator element, the stroke of the wire for driving the throttle valve is controlled, making it possible to linearly control this stroke in response to the excitation current. A constant-speed traveling device has been created that uses a simple and reliable actuator that does not require a negative pressure source, is not affected by engine load, and does not suffer from deterioration factors such as mechanical wear. This has become possible, and its practical effects are extremely large.

[Brief explanation of drawings]

FIG. 1 is a system block diagram showing the overall configuration of an embodiment of a constant speed traveling device of the present invention, and FIG. FIG. 3 is a diagram showing a specific configuration of the magnetic fluid actuator main body in the above embodiment, and FIG. 4 is a system block diagram showing the configuration of a conventional constant speed traveling device. IA...Magnetic fluid actuator body, 1a+...
・Reel, 1bl...actuator element, IC+
...Spring, 1d+ ・Pulley, 1e+, 2a
, 2b...wire, 1f...excitation coil, 11.
...Arm, 1+...Magnetic fluid, 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] an actuator element formed by enclosing a magnetic fluid in an elastic membrane; a spring coupled to the actuator element;
A wire interposed and fixed between the actuator element and the spring, a pulley driven by the wire, a reel provided on one side of the pulley for winding and driving the wire for driving the throttle valve, and the pulley portion at one end thereof. A constant speed traveling device comprising a magnetic fluid actuator main body comprising an arm that holds the actuator element and supports the other end as a fixed end, and an excitation coil for applying a magnetic field to the actuator element.