JP2598341B2 - Automotive engine throttle valve controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traction control system which adjusts the opening of a throttle valve, and adjusts the opening of the throttle valve in conjunction with the depression of an accelerator pedal when a trouble occurs in the traction control system. And a throttle valve control device for an automobile engine.

[0002]

2. Description of the Related Art In a carburetor, a traction control system for controlling the opening of a throttle valve by a stepping motor has recently been adopted. Generally, this traction control system always connects a motor and a throttle valve via a gear, and controls the motor by a control unit to control the opening of the throttle valve. However, in such a configuration in which the motor and the throttle valve are always connected via gears, the rotation of the throttle valve becomes impossible due to the fixed motor shaft or the fixed gear, and the car may run away. .

[0003] In order to solve such a problem,
Japanese Patent Application Laid-Open No. 63-5120 discloses a traction control system in which, when a failure occurs in a traction control system, a throttle valve is slightly opened in conjunction with an accelerator to prevent an accident from occurring.

In this prior art, one end of a throttle shaft and a stepping motor are connected via an electromagnetic clutch, and the opening of a throttle valve is normally controlled only by the stepping motor. Having. If a failure occurs in this stepping motor or other components,
This electromagnetic clutch releases the connection between the throttle shaft and the stepping motor. On the other hand, a mechanically operated accelerator sector that rotates in conjunction with the accelerator is attached to the other end of the throttle shaft, and the throttle valve is mechanically opened and closed in conjunction with the accelerator. The opening of the throttle valve by this accelerator sector is
When the opening of the throttle valve by the stepping motor is set smaller than that and the stepping motor or the like breaks down, the time when the accelerator sector affects the opening of the throttle valve is determined when the accelerator pedal depression amount is large. And Also, the throttle valve is always biased in the closing direction by a return spring, and when a failure occurs in a stepping motor or the like, the electromagnetic clutch is disengaged and the throttle valve is set to close the intake passage by the return spring. I have.

In the prior art of this configuration, while the stepping motor or the like is operating without failure, even if the accelerator pedal depression amount is large, the accelerator sector does not affect the opening of the throttle valve. When the stepping motor or the like breaks down, the connection between the stepping motor and the throttle shaft is disconnected and the throttle valve closes the intake passage, but if the amount of depression of the accelerator is increased, the throttle valve opens slightly, so the car stops immediately. It is possible to run for a while without any problem.

[0006]

SUMMARY OF THE INVENTION As in this prior example,
In a configuration that employs a traction control system and mechanically operates the throttle valve according to the amount of depression of the accelerator when a failure occurs, normal operation cannot be performed due to mechanical opening and closing of the throttle valve.
This is because, if normal operation can be performed by opening and closing the mechanical throttle valve, a traction control system that controls the opening degree of the throttle valve by the stepping motor is obstructed. As a result, in this prior example, the mechanical throttle valve opening must be small, the vehicle can run only when the accelerator pedal is depressed large, and the vehicle stops when driving at high speed. Therefore, normal operation cannot be performed only with a mechanical configuration. Further, in this prior art, since a stepping motor must be provided on one side of the throttle shaft and an accelerator sector must be provided on the other side of the throttle shaft, there is a drawback that the traction control system cannot be downsized.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and even when a failure occurs in a traction control system, normal operation can be performed by a mechanical structure that operates according to the amount of depression of an accelerator. It is another object of the present invention to provide a throttle valve control device for an automobile engine that can reduce the size of a traction control system.

[0008]

In order to achieve the above object, the present invention provides a throttle shaft rotatably mounted on a body, a throttle valve fixed to the throttle shaft, and a throttle valve mounted on the throttle shaft. An armature that rotates at the same angle as the throttle valve, a torsion spring that always rotates the throttle valve in a direction to open, a motor that is driven according to the driving situation, a rotor that is rotated by the motor, A clutch coil for causing the rotor to be fixed, a control unit that cuts off power to the motor and the clutch coil,
An accelerator interlocking member that is displaced in accordance with the amount of depression of the accelerator, an urging means for returning the accelerator interlocking member to a predetermined position when the accelerator is not depressed by the accelerator, and a state in which the amateur is not fixed to the clutch coil And an arm fixed to an accelerator interlocking member to prevent rotation of the armature urged by the torsion spring when the clutch coil is energized.When the clutch coil is energized, the motor controls the opening of the throttle valve. When the power to the clutch coil is cut off, the armature is brought into contact with the arm of the accelerator interlocking member by the torsion spring, and the opening of the throttle valve is controlled according to the depression of the accelerator. is there.

[0009]

When the electric system is normal, the rotor is rotated by the stepping motor, and at the same time, the armature is fixed to the rotor by the clutch coil. This controls opening and closing of the throttle valve by the traction control system. At this time, the armature and the accelerator interlocking member are connected, but the accelerator interlocking member is restrained from rotating the armature by the torsion spring. When a failure occurs in the electric system, the energization of the clutch coil is stopped and the armature is set in a free state with respect to the rotor. Thereby, the amateur is rotated in accordance with the movement of the accelerator interlocking member. That is, it is possible to travel in accordance with the mechanical movement of the accelerator.

[0010]

Next, the present invention will be described with reference to the drawings. A throttle shaft 14 to which a throttle valve 12 is fixed is rotatably attached to the body 10, and a cross section of an intake passage 16 formed in the body 10 is opened and closed by the throttle valve 12. One end of the throttle shaft 14 protrudes outside the body 10, and a plate-shaped armature 18 is fixed to a tip of the protruded throttle shaft 14 by a nut 20. The supporting member 22 fixed to the body 10 has a rotating shaft 2
An accelerator interlocking member 26 to which the fixing member 4 is fixed is rotatably mounted about its rotation shaft 24, and the accelerator interlocking member 26 is rotated according to the movement of the accelerator wire 28. The rotation shaft 24 of the accelerator interlocking member 26 and the throttle shaft 14 are set to be coaxial. The accelerator interlocking member 26 and the support member 2
A torsion spring 30 that urges the accelerator interlocking member 26 in a direction to return the accelerator interlocking member 26 to a predetermined position (a position when the accelerator is not depressed) is attached between the two. An arm 27 for controlling the movement of the armature 18 is integrally formed with the accelerator interlocking member 26, and the arm 27 rotates about the rotation shaft 24 of the accelerator interlocking member 26. When the accelerator is depressed in a state where the throttle valve 12 is closed, the arm 27 is arranged at a position where the accelerator interlocking member 26 freely rotates, that is, at a position where the arm 27 does not come into contact with the amateur 18.

A torsion spring 31 for urging the armature 18 in a direction to always open the throttle shaft 14 is latched on the armature 18. This torsion spring 3
When the arm 27 is at the rest position, the spring force is set to a strength that does not push the arm 27 to rotate the accelerator interlocking member 26. Here, the accelerator interlocking member 26, the torsion spring 30, the amateur 18,
The only relation between the torsion spring 31 and the four members is that the armature 18 urged by the torsion spring 31 contacts the arm 27 fixed to the accelerator interlocking member 26 regardless of the position of the accelerator interlocking member 26 in any position. .

At the position where the throttle shaft 14 protrudes, the radial bearing 3
The second inner ring is fixed. A rotor 36 having a gear 34 formed on its outer periphery is fixed to the outer ring of the bearing 32, and the gear 34 of the rotor 36 meshes with a pinion 40 attached to a stepping motor 38. The stepping motor 38 is controlled by the control unit 42, and the rotor 36 is rotated via the pinion 40 and the gear 34 by the driving of the stepping motor 38. An annular concave portion 44 is formed on a side surface of the rotor 36 facing the body 10, and a clutch coil 46 is attached to the body 10 while being located in the concave portion 44. The clutch coil 46 is connected to the control unit 42
Is turned off. An annular friction plate 50 is attached to a surface of the armature 18 facing the rotor 36 via a leaf spring 48. This friction plate 50
When the clutch coil 46 is energized, the armature 18 is pulled toward the clutch coil 46 and comes into contact with the rotor 36.
That is, when the clutch coil 46 is energized, the armature 18 and the rotor 36 are fixed. When the clutch coil 46 is not energized, the leaf spring 48 urges the armature 18 in a direction away from the clutch coil 46 by its spring force, so that the armature 18 and the rotor 36 are not fixed.

The other end of the throttle shaft 14 is also the body 1
The lever 52 is attached to the end of the throttle shaft 14 that protrudes outside the body 10. A throttle position sensor 54 for detecting the position of the lever 52 is attached to the body 10, and a signal notifying the opening degree of the throttle valve 12 is output from the throttle position sensor 54 to the control unit 42.

Next, the operation will be described. When the traction control system operates, the control unit 42 energizes the clutch coil 46. When the clutch coil 46 is energized, the armature 18 is pulled toward the clutch coil 46 and the rotor 3
6 and a fixed state. At the same time, the control unit 42 also supplies power to the stepping motor 38. When the stepping motor 38 is driven,
The rotor 36 is rotated via the pinion 40 and the gear 34. The rotor 36 and the armature 18 are fixed, and the armature 18 is
4, the throttle shaft 14 is rotated by the driving of the stepping motor 38, and the intake valve 16 is opened and closed by the throttle valve 12. The opening of the throttle valve 12 is detected by a throttle position sensor 54, and the control unit 42 operates the stepping motor 38 until the opening of the throttle valve 12 reaches a predetermined opening according to the driving situation.

When the traction control system operates, the armature 18 and the throttle valve 12 are not affected by the accelerator. That is, when the rotation angle of the accelerator interlocking member 26 is larger than the rotation angle of the armature 18, the arm 27 is separated from the armature 18 and is not affected by the accelerator. Suppose amateur 1
If the rotation angle of 8 is larger than the rotation angle of the accelerator interlocking member 26, the armature 18 rotates the accelerator interlocking member 26 more than the rotation angle of the accelerator interlocking member 26 due to depression of the accelerator against the torsion spring 30. So it is not affected by the accelerator

Next, if the opening of the throttle valve 12 does not change even when the stepping motor 38 is energized, the control unit 42
The power supply to 6 is stopped. When the power supply to the clutch coil 46 is stopped, the armature 18 is not fixed to the rotor 36. As a result, the armature 18 is always affected by the direction in which the throttle valve 12 is opened by the torsion spring 31, but the armature 18 comes into contact with the arm 27 of the accelerator interlocking member 26. In this state, when the accelerator is depressed, the accelerator interlocking member 26 rotates and the arm 2
7, and the throttle valve 12 is rotated accordingly. That is, the vehicle travels by a normal accelerator operation.

[0017]

As described above, according to the present invention, the opening and closing of the throttle valve is normally controlled by the traction control system, but if a failure occurs in the traction control system, it is directly linked to the accelerator. Then, the opening and closing operation of the throttle valve is performed. Therefore, even if a failure occurs in the traction control system, normal driving and running by operating the accelerator can be performed. Further, in the conventional traction control system in which the possibility of runaway due to the inability to control the throttle valve can be surely eliminated, the main components must be provided on both sides of the throttle shaft. Since the main constituent members can be provided on one side of the shaft, the size of the traction control system can be reduced as compared with the conventional one.

[Brief description of the drawings]

FIG. 1 is a sectional view of a throttle valve control device for an automobile engine according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Body 12 Throttle valve 14 Throttle shaft 18 Amateur 26 Accelerator interlocking member 27 Arm 30 Torsion spring 31 Torsion spring 36 Rotor 38 Motor 42 Control unit 46 Clutch coil

Continuation of the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location F02D 41/22 310 F02D 41/22 310M (56) References JP-A-3-111163 (JP, A) JP JP-A-4-231631 (JP, A) JP-A-2-91432 (JP, A) JP-A-59-153945 (JP, A) JP-A-63-5120 (JP, A) JP-A-4-54233 (JP) , A) JP-A-4-19332 (JP, A)

Claims (1)

(57) [Claims] 1. A throttle shaft rotatably attached to a body, a throttle valve fixed to the throttle shaft, an armature attached to the throttle shaft and rotating at the same angle as the throttle valve, and a throttle valve always connected to the throttle shaft. A torsion spring that rotates in the opening direction, a motor that is driven according to the driving situation, a rotor that is rotated by this motor,
A clutch coil for causing the armature to be fixed to the rotor when energized, a control unit for interrupting energization of the motor and the clutch coil, an accelerator interlocking member displaced in accordance with an accelerator pedal depression amount, and the accelerator Biasing means for returning the interlocking member to a predetermined position at the time when the accelerator is not depressed,
An arm fixed to an accelerator interlocking member to prevent rotation of the armature biased by the torsion spring when the armature is in a non-fixed state with the clutch coil, and when the clutch coil is energized. Controls the opening of the throttle valve by a motor, and when the power to the clutch coil is cut off, causes the armature to contact the arm of the accelerator interlocking member by the torsion spring, and opens the throttle valve according to the depression of the accelerator. A throttle valve control device for a vehicle engine, wherein the degree is controlled.