JPH06129268A - Throttle valve control device - Google Patents

Abstract

PURPOSE:To simplify structure and to increase speed of opening and closing a secondary throttle valve. CONSTITUTION:This throttle valve control device is furnished with a throttle body 1 forming a part of an air intake passage 12 of an engine, a main throttle valve 9 to open and close the air intake passage 12 and a secondary throttle valve 2 to open and close the air intake passage 12 by controlling a motor 8 for control. To a rotor 7 of the motor 8 for control, a secondary throttle shaft 3 of the secondary throttle valve 2 is directly connected. The secondary throttle shaft 3 is offset against a shaft center of the air intake passage 12, and on the secondary throttle shaft 3, the secondary throttle valve 2 is provided so that its opening and closing end farther from its shaft center than the other is positioned in the downstream of the other opening and closing end nearer to the shaft center.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle valve control device having two main and sub throttle valves for opening and closing an intake passage of an automobile engine.

[0002]

2. Description of the Related Art Conventionally, a throttle valve control device of this type has been proposed by the same applicant, for example, in Japanese Utility Model Laid-Open No. 64-46.
There is 443 publication. The device of this publication includes a throttle body that forms a part of an intake passage of an engine, a main throttle valve that opens and closes the intake passage of the body by an accelerator operation, and the intake passage through a reduction gear controlled by a control motor. A sub-throttle valve that opens and closes by a valve and a return spring that urges the sub-throttle valve in the fully opening direction are provided.

[0003]

In the conventional throttle valve control device, the driving force of the control motor is transmitted to the sub-throttle valve through the reduction gear, which urges the sub-throttle valve in the fully opening direction. This is to secure a torque that overcomes the return spring, and to reduce the size and torque of the control motor. Therefore, since the return spring and the reduction gear are provided, the number of parts is large and the structure is complicated. Further, since a time lag is generated between the control motor and the sub throttle valve due to the reduction gear, it prevents the sub throttle valve from opening and closing at high speed.
Therefore, a high-response, high-speed rotation type expensive motor is required for the control motor.

Therefore, the present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a throttle valve control device capable of simplifying the structure and speeding up the opening and closing of the auxiliary throttle valve. To do.

[0005]

SUMMARY OF THE INVENTION A throttle valve control device of the present invention for solving the above-mentioned problems is a throttle body forming a part of an intake passage of an engine, and a main throttle for opening and closing the intake passage of the body by an accelerator operation. Valve and
In a throttle valve control device including a sub-throttle valve that opens and closes the intake passage under the control of a control motor, a sub-throttle shaft of the sub-throttle valve is directly connected to a rotor of the control motor, and the sub-throttle shaft is intake air. The sub throttle shaft is offset with respect to the axial center of the passage, and the sub throttle valve is provided so that the open / close end farther from the axial center is located downstream of the close open / close end.

[0006]

According to the above means, since the rotation of the rotor due to the operation of the control motor is directly transmitted to the sub throttle shaft,
The sub-throttle valve can be opened and closed without being biased by the return spring or the like. Further, due to the offset arrangement of the throttle shaft of the sub throttle valve, the intake pipe negative pressure acts on the sub throttle valve in the valve opening direction. Therefore, if the opening and closing of the sub-throttle valve by the motor becomes uncontrollable due to an abnormality such as coil breakage of the control motor, the sub-throttle valve is opened by the negative pressure of the intake pipe and the main throttle valve is opened. Evacuation travel is possible by operating the valve.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. In FIG. 1 in which the throttle valve control device is shown in a front sectional view, a throttle body 1 is formed in a substantially cylindrical shape which forms a part of an intake passage 12 of an automobile engine. On the upper and lower parts of the throttle body 1, both ends of a sub throttle shaft 3 and a main throttle shaft 10 are rotatably supported via bearings 13 and 14, respectively. Throttle valves 2 and 9 for opening and closing the intake passage 12 are attached to the throttle shafts 3 and 10, respectively. Both ends of each throttle shaft 3 and 10 are projected from the side surface of the body.

An accelerator linkage (not shown) is connected to one end portion (right end portion in the drawing) of the main throttle shaft 10, and a back spring 16 for urging the main throttle valve 9 in the closing direction is arranged. The other end of the main throttle shaft 10 has a detection lever (not shown) of a throttle sensor 11 installed on the side surface of the throttle body 1.
Is engaged with. The main throttle valve 9 is normally placed in a fully closed state, which is an idle opening degree by the biasing of the back spring 16, and is rotated to a desired opening degree through the accelerator linkage in conjunction with the operation of an accelerator pedal (not shown). To be Further, the throttle sensor 11 detects the opening degree of the main throttle valve 9 based on the rotation of the main throttle shaft 10, and inputs the detection signal to a control device (ECU) not shown.

A lever 22 is attached to one end portion (right end portion in the drawing) of the sub-throttle shaft 3. The lever 22 comes into contact with the lever stopper (one of which is shown in the figure) 21 provided on the side surface of the throttle body 1 when the sub throttle valve 2 is fully closed and fully opened, and restricts further rotation. At the other end of the sub-throttle shaft 3, a control motor 8 comprising a step motor installed coaxially with the throttle shaft 3 on the side surface of the throttle body 1.
The rotor 7 of is directly connected.

The control motor 8 comprises a rotor 7, a stator 4 surrounding the outer circumference of the rotor 7, and a housing 18 for housing the rotor 7 and the stator 4. The stator 4 has a stator coil 19 mounted on a cup 20. The rotor 7 rotatably arranged in the stator 4 comprises a magnet 5 and a sleeve 6 which are integrally formed or bonded by an adhesive or the like. When a drive pulse signal is applied to a coil 19 of the stator 4, It rotates a predetermined angle according to the signal. The other end of the sub-throttle shaft 3 is coaxially inserted into the sleeve 6 of the rotor 7 and fixed by the nut 24, whereby the rotor 7 and the sub-throttle shaft 3 are directly connected.

The control motor 8 includes the control device (E
The sub-throttle valve 2 is normally fully opened, and is opened to a predetermined opening by the forward rotation of the motor 8 and opened to a predetermined opening by the reverse rotation of the motor 8.

However, the two main and sub throttle shafts 1
As shown in the side sectional view of FIG. 2, 0 and 3 are arranged as follows with respect to the axis C1 of the intake passage 12. The axis C2 of the main throttle shaft 10 is on the axis C1 of the intake passage 12. The sub-throttle shaft 3 has its axis C3 offset from the axis C1 of the intake passage 12 with a dimension A, unlike a general one. Therefore, the sub-throttle valve 2 is mounted so that the opening / closing end 2a farther from the axis C3 of the auxiliary throttle shaft 3 is located downstream of the closer opening / closing end 2b.

In the above-mentioned throttle valve control device,
In the non-traveling state, as shown in FIG. 2, the main throttle valve 9 is fully closed and the sub throttle valve 2 is fully open. In a normal traveling state, the main throttle valve 9 is rotated to a desired opening degree through the accelerator linkage in conjunction with the operation of an accelerator pedal (not shown).

When the control unit (ECU) detects and determines the opening operation of the main throttle valve 9 and determines that the engine output is excessive, the control unit operates the control motor 8 based on this. By closing the sub-throttle valve 2, so-called traction control that suppresses the engine output is performed. This state is shown in the explanatory view of FIG. After the above output control is completed, the sub-throttle valve 2 is returned to the initial position (fully open position) by the control of the control motor 8 by the control device.

After the output control is completed, if the auxiliary throttle valve 2 cannot be opened, that is, cannot be controlled due to an abnormality such as a coil disconnection of the control motor 8, etc., the vehicle is operated as follows. It is possible to evacuate. That is, due to the offset arrangement of the throttle shaft 3 of the sub throttle valve 2, the intake pipe negative pressure action acts on the sub throttle valve 2 in the valve opening direction (clockwise direction in FIG. 3). Therefore, the auxiliary throttle valve 2 is opened by the action of the negative pressure of the intake pipe as shown in the explanatory view of FIG. In addition, at the time of the abnormality, it is assumed that the control device performs the de-energizing process for the control motor 8.

According to the above-mentioned throttle valve control device,
The rotation of the rotor 7 due to the operation of the control motor 8 is directly transmitted to the sub-throttle shaft 3 without passing through the reduction gear, and the sub-throttle valve 2 is opened and closed without being biased by the return spring or the like. Therefore, since the reduction gear and the return spring in the conventional throttle valve control device are not required, the number of parts can be greatly reduced and the structure is simplified. Further, since the control motor 8 and the sub-throttle shaft 3 are directly connected, the time lag due to the conventional reduction gear can be eliminated, and the opening and closing of the sub-throttle valve 2 can be speeded up.

Further, due to the offset arrangement of the throttle shaft of the sub throttle valve 2, if the control motor 8 of the control motor 8 cannot be controlled, the sub throttle valve 2 is opened by the negative pressure action of the intake pipe. It is possible to retreat by operating the throttle valve 9, and therefore, an inexpensive and simple fail-safe configuration can be secured without the conventionally required return spring. In addition, since the return spring for the sub-throttle valve is not required, a reduction gear for securing torque is not required, and it is possible to use a compact and low-torque control motor 8 and a high-response, high-speed rotation type expensive. It is possible to speed up the opening and closing of the sub-throttle valve 2 without adopting such a motor, and thus the above effect can be brought about.

[0018]

According to the present invention, since the reduction gear and the return spring in the conventional throttle valve control device are unnecessary, the number of parts can be greatly reduced and the structure can be simplified. Further, by directly connecting the rotor of the control motor and the sub-throttle shaft, the time lag due to the conventional reduction gear can be eliminated, and the opening and closing of the sub-throttle valve can be speeded up. Also, due to the offset arrangement of the throttle shaft of the sub-throttle valve, if the control motor cannot be controlled, the sub-throttle valve will be opened due to the negative pressure effect of the intake pipe, allowing the escape travel by operating the main throttle valve. Therefore, an inexpensive and simple fail-safe configuration can be secured without the conventionally required return spring.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a throttle valve control device.

FIG. 2 is a side sectional view showing a throttle valve control device.

FIG. 3 is an explanatory diagram showing an abnormal state of the throttle valve control device.

FIG. 4 is an explanatory diagram showing a retracted traveling state of a throttle valve control device.

[Explanation of symbols]

 1 Throttle body 2 Sub throttle valve 3 Sub throttle shaft 7 Rotor 8 Control motor 9 Main throttle valve 12 Intake passage

Claims (1)

[Claims] 1. A throttle body that forms a part of an intake passage of an engine, a main throttle valve that opens and closes the intake passage of the body by an accelerator operation, and a sub-throttle valve that opens and closes the intake passage by the control of a control motor. In the throttle valve control device, the auxiliary throttle shaft of the auxiliary throttle valve is directly connected to the rotor of the control motor, the auxiliary throttle shaft is offset with respect to the axial center of the intake passage, and the auxiliary throttle shaft is A throttle valve control device provided such that the sub-throttle valve is positioned such that the opening / closing end farther from the axis of the sub-throttle valve is located downstream of the closer opening / closing end.