JPH09126070A - Throttle valve control device of engine for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To integrate a throttle body with an accelerator sensor, to improve the space efficiency and assemblability, and to prevent the accelerator from being frozen employing the cooling water (hot water) of an engine. SOLUTION: An interlocking shaft 11 which is mechanically interlocked to an acceleration pedal 13 is supported by a housing 10 integrated with a throttle body 1, an accelerator sensor 16 to detect the rotation of the interlocking shaft 11 is fitted to the housing 10, and a hot water passage 19 to distribute the cooling water of the engine is formed on the throttle body 1 close to the housing 10.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle valve axially supported by a throttle body connected to an intake port of an engine, a step motor connected to open and close the throttle valve, and an operation amount of an accelerator operator of a vehicle. The present invention relates to a throttle valve control device for a vehicle engine, which includes an accelerator sensor for detection and an electronic control unit that operates a step motor based on an output signal of the accelerator sensor.

2. Description of the Related Art Such a throttle valve control device is already known, for example, as disclosed in Japanese Patent Laid-Open No. 3-134250.

In the conventional throttle valve control device for an automobile engine, the accelerator sensor is installed far away from the throttle body so as to directly detect the depression amount of the accelerator pedal which is an accelerator operator. Therefore, the space efficiency is poor, and the assembling property is not good, and when the accelerator sensor is installed in the engine room, a protective cover or the like for covering the sensor is required as a measure against icing. The present invention has been made in view of such circumstances, and makes it possible to integrate the accelerator sensor with the throttle body and to prevent freezing of the sensor without using a special protective cover. It is an object of the present invention to provide the above throttle valve control device.

In order to achieve the above object, the present invention provides a throttle body with an accelerator interlocking portion having an interlocking shaft mechanically interlocked with an accelerator operator, and the rotation angle of the interlocking shaft. The accelerator interlocking part is provided with an accelerator sensor that detects as the operation amount of the accelerator operator.
The throttle body is characterized in that a warm water passage for circulating engine cooling water is formed in the vicinity of the accelerator interlocking portion.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described based on the embodiments of the present invention shown in the accompanying drawings. In the drawing, a throttle shaft 1 which opens and closes an intake passage 2 is supported by a throttle body 1 which is connected to an intake port of an engine mounted on a vehicle through an intake manifold. A step motor 5 that can open and close the throttle valve 3 via a valve shaft 4 is provided on one side of the throttle body 1.
However, throttle sensors 6 for detecting the rotation angle of the valve shaft 4 as the opening degree of the throttle valve 3 are provided on the other side portions. A boost sensor 7 is provided on the upper side of the throttle body 1. This boost sensor 7
Communicates with the intake passage 2 downstream of the throttle valve 3 via a passage 8 to detect the boost pressure on the downstream side of the intake passage 2. Further, an accelerator interlocking portion 9 is provided on the lower side of the throttle body 1. A housing 10 of the accelerator interlocking portion 9 is integrally formed with the throttle body 1, and an interlocking shaft 11 rotatably supported by the housing 10.
The pulley 12 is fixed to one end of the. The pulley 12 is mechanically connected to an accelerator pedal 13 (accelerator operator) of an automobile through a Bowden wire 14 and rotates the interlocking shaft 11 in a predetermined direction according to the depression of the accelerator pedal 13. . A return spring 15, which is a torsion coil spring, is connected to the pulley 12 to bias the pulley 12 in the return rotation direction. An accelerator sensor 16 that detects the rotation angle of the interlocking shaft 11 as the depression amount of the throttle pedal on the side opposite to the pulley 12 is attached to the housing 10. The operation of the step motor 5 is controlled by an electronic control unit 17, and the unit includes an engine rotation speed detecting the rotation speed of the engine in addition to the output signals of the throttle sensor 6, boost sensor 7 and accelerator sensor 16. The output signal of the sensor 18 is input. Furthermore, the throttle body 1 is provided with a hot water passage 19 that passes between the intake passage 2 and the accelerator interlocking portion 9. This hot water channel 1
The reference numeral 9 communicates with the cooling water jacket of the engine so that the hot water heated by the cooling water jacket flows. Next, the operation of this embodiment will be described. When the accelerator pedal 13 is stepped on to accelerate the rotation of the engine while the vehicle is running, the interlocking shaft 11 of the accelerator interlocking portion 9 rotates in response to the accelerator pedal 13 and a signal corresponding to the rotational angle is output from the accelerator sensor 16. Received electronic control unit 1
7 operates the step motor 5 to open the throttle valve 3. During this time, a change in the opening degree of the throttle valve 3 is detected by the throttle sensor 6, a change in the engine speed is detected by the engine rotation sensor 18, and a change in the boost pressure is detected by the boost sensor 7, which are input to the electronic control unit 17. Therefore, the electronic control unit 17 corrects the operation amount of the step motor 5 based on the input signals so that the engine speed and the boost pressure match the depression amount of the accelerator pedal 13. By the way, during operation of the engine, a part of the cooling water (hot water) flowing through the cooling water jacket always flows through the hot water passage 19 of the throttle body 1, and the hot water passage 19 is close to the intake passage 2 and the throttle interlocking portion 9. Since the cooling water of the engine is utilized, it is possible to effectively heat the intake passage 2 and the accelerator interlocking portion 9, whereby the throttle valve 3, the interlocking shaft 11, and the accelerator sensor 16 are frozen. Can be prevented. Therefore, it is not necessary to provide the accelerator interlocking portion 9 and the accelerator sensor 16 with a special protective cover for preventing icing. The present invention is not limited to the above embodiment, and various design changes can be made without departing from the gist thereof. For example, a link may be used for interlocking between the accelerator pedal 13 and the interlocking shaft 11. The device of the present invention can also be applied to a motorcycle.

As described above, according to the present invention, the throttle body is provided with the accelerator interlocking portion having the interlocking shaft mechanically interlocked with the accelerator operator, and the rotation angle of the interlocking shaft is used to operate the accelerator operator. An accelerator sensor that detects the amount is installed in the accelerator interlocking part, and a hot water passage for circulating engine cooling water is formed in the throttle body in the vicinity of this accelerator interlocking part, so it is possible to integrate the throttle body and the accelerator sensor. In addition, space efficiency and assemblability can be improved. Further, the cooling water of the engine can be used to heat the accelerator interlocking portion and the accelerator sensor to prevent freezing of them, and therefore a protective cover for preventing freezing becomes unnecessary, which can also contribute to simplification of the structure. .

[Brief description of the drawings]

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

[Explanation of symbols]

 1 Throttle body 2 Intake passage 3 Throttle valve 5 Step motor 9 Accelerator interlocking part 10 Housing 11 Interlocking shaft 13 Accelerator pedal as an accelerator operator 16 Accelerator sensor 17 Electronic control unit 19 Hot water channel

Claims (1)

[Claims] 1. A step motor (5) connected to a throttle valve (3) pivotally supported by a throttle body (1) connected to an intake port of an engine so as to open and close it.
And an accelerator sensor (16) for detecting an operation amount of an accelerator operator (13) of the vehicle, and the accelerator sensor (1
In a throttle valve control device for a vehicle engine, which comprises an electronic control unit (17) that operates a step motor (5) based on the output signal of 6), a throttle body (1) and an accelerator operator (13) are provided. An accelerator sensor (16) is provided which is provided with an accelerator interlocking portion (9) having a mechanically interlocking interlocking shaft (11) and which detects a rotation angle of the interlocking shaft (11) as an operation amount of an accelerator operator (13). A vehicle body engine, characterized in that a throttle body (1) is provided with a warm water passage (19) provided in the interlocking portion (9) and in the vicinity of the accelerator interlocking portion (9) for circulating engine cooling water. Throttle valve control device.