Electronic throttle valve

Abstract

The utility model discloses an electronic throttle valve and belongs to the field of unmanned aerial vehicles. Comprising a throttle valve body, the throttle valve body comprises a throttle valve body, a driving motor and a transmission assembly, a butterfly piece is rotationally connected into a stepped hole of the throttle valve body through a throttle valve shaft, and the driving motor controls the rotating angles of the throttle valve shaft and the butterfly piece through the transmission assembly; the throttle valve further comprises an adjustable mechanical redundancy module, the adjustable mechanical redundancy module is connected with the transmission assembly, the driving motor serves as a driving component when the throttle valve body works normally, and the adjustable mechanical redundancy module serves as a driving component when the throttle valve body is in a fault state. When a motor fault or a sensor fault occurs, the position of the electronic throttle valve is controllable, so that normal work of an engine is guaranteed, and the reliability of the engine and even an unmanned aerial vehicle system is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of unmanned plane, concretely relates to an electronic throttle. BACKGROUND

[0002] The active unmanned plane adopts the internal combustion engine type engine as direct power, and the electronic throttle is an important part for realizing engine power control. The engine intake is controlled by adjusting the size of the electronic throttle opening, so as to control the engine speed and output power.

[0003] The common electronic throttle is divided into two kinds:

[0004] 1. Without redundancy function, the normal work is guaranteed by reliability. When the electronic throttle motor fails, it cannot be controlled. When the sensor fails to collect, the actual position of the electronic throttle cannot be known, resulting in abnormal adjustment, causing the engine injection quantity and intake quantity to be unmatched, so that the engine stops, endangering the safety of the unmanned plane.

[0005] 2. The return spring is installed, but the position of the return spring cannot be adjusted. In abnormal conditions, the throttle can only return to the minimum opening or the maximum opening. When the throttle is at the minimum opening, the engine cannot work stably, and the engine may stop or the engine cannot meet the power demand of the unmanned plane, causing the unmanned plane to stall and crash. When the throttle is always maintained at the maximum opening, the engine will always work at high power, which may cause the engine to overheat and be scrapped, so it has no practical value. SUMMARY

[0006] The technical problem to be solved is:

[0007] In order to avoid the shortcomings of the prior art, the utility model provides an electronic throttle with fault redundancy function, which can realize controllable electronic throttle position when the motor fails or the sensor fails by the combination of the driving module and the adjustable mechanical redundancy module, so as to ensure the normal work of the engine and greatly improve the reliability of the engine and even the unmanned plane system.

[0008] The technical scheme of the utility model is: an electronic throttle, which comprises a throttle valve body, the throttle valve body comprises a throttle body and a driving motor and a transmission assembly, a butterfly piece is rotatably connected in the stepped hole of the throttle body through a throttle shaft, and the driving motor controls the rotation angle of the throttle shaft and the butterfly piece through the transmission assembly; and an adjustable mechanical redundancy module is further included, the adjustable mechanical redundancy module is connected with the transmission assembly, the driving motor serves as a driving component of the throttle valve body in normal work, and the adjustable mechanical redundancy module serves as a driving component of the throttle valve body in fault state.

[0009] The further technical scheme of the utility model discloses: the middle part of the throttle body is the stepped hole of installing throttle shaft, and the one end is encapsulated with the cover plate, and the other end installs the position sensor on the flange of throttle valve body, and the cover plate and throttle valve body constitute the cavity of installing transmission assembly and adjustable mechanical redundancy module.

[0010] The further technical scheme of the utility model discloses: the transmission assembly includes the pinion and the gear that intermesh, and the pinion is installed on the output shaft of drive motor, and the gear is installed on one end of throttle shaft.

[0011] The further technical scheme of the utility model discloses: drive motor is installed on throttle body through motor support, and its output shaft passes through the shell and stretches into the cavity and is coaxially connected with the pinion, and the pinion is the power source of the pinion.

[0012] The further technical scheme of the utility model discloses: adjustable mechanical redundancy module includes return spring and dynamic balance assembly, and one end of return spring is connected with the gear, and the other end is connected with the execution end of dynamic balance assembly, and the initial tension of return spring is adjusted through dynamic balance assembly, to set the safe opening when electronic throttle resets to failure.

[0013] The further technical scheme of the utility model discloses: dynamic balance assembly includes adjusting screw, locking spring and spring seat, and the rod part of adjusting screw is provided with external thread, is screwed on throttle body through thread, and its tail end is hinged with return spring, and its head part is located on the outside of throttle body, and locking spring is sleeved on the rod part between adjusting screw and throttle body.

[0014] The further technical scheme of the utility model discloses: the tail end of adjusting screw is the stepped shaft structure, and the diameter of tail end is less than the diameter of middle rod part.

[0015] The further technical scheme of the utility model discloses: dynamic balance assembly also includes spring seat, and the spring seat is the ring structure that is sleeved on the stepped shaft of adjusting screw tail end, and the lug arranged on the outer periphery is hinged with the other end of return spring, and spring seat and adjusting screw are clearance fit and can relatively rotate.

[0016] The further technical scheme of the utility model discloses: the small diameter end of adjusting screw is sleeved with the snap spring on the outside of spring seat, and the axial displacement of spring seat is limited when adjusting screw rotates through snap spring.

[0017] The further technical scheme of the utility model discloses: the center axis of return spring and adjusting screw is located in the same plane, and it is parallel to each other, the rotation axis of the big gear is perpendicular to the plane where the center axis of return spring and adjusting screw is located.

[0018] Beneficial effects

[0019] The utility model discloses the beneficial effect lies in: the utility model combines mechanical redundancy with adjustable safety position, solves the core problem that traditional electronic throttle valve cannot be flexibly controlled when failing, has high reliability, convenient operation and environmental adaptability, and provides a breakthrough solution for the safety of unmanned aerial vehicle power system.

[0020] 1. When the motor fails or the sensor fails, the utility model discloses the design of mechanical return spring and adjustable safety position, ensures that the throttle valve is automatically reset to the preset opening (such as the middle position), avoids engine parking or overheating, significantly improves the fault tolerance of unmanned aerial vehicle power system, and has the fault redundancy function of high reliability.

[0021] 2. The utility model discloses the cooperation of adjusting screw and locking spring, and the safety opening can be preset according to different flight requirements (such as emergency hovering, return), and the safety position is flexibly adjustable, which solves the engine flameout or overload problem caused by the fixed minimum / maximum opening in the traditional scheme, and has stronger adaptability.

[0022] 3. The mechanical structure (return spring, gear transmission) designed in the utility model operates independently of the electronic system, so that even if the electronic control completely fails, the basic function of the throttle valve can still be guaranteed, and the utility model is suitable for high-temperature, vibration and other harsh environments, and the system robustness is significantly improved.

[0023] 4. The safety position calibration of the utility model only needs to rotate the adjusting screw during ground debugging and write into the controller, so that complex equipment or frequent maintenance is not needed, the operation and maintenance difficulty and cost are reduced, and the need for manual intervention is reduced through the automatic fault recovery process (such as automatically powering off and resetting when the sensor fails).

[0024] 5. The utility model adopts locking spring and clasp spring to ensure that the position of the adjusting screw is fixed, can effectively prevent the problem that vibration or impact causes the safety opening to deviate, and has high long-term use stability. The tension dynamic balance mechanism of the return spring considers the control accuracy of normal work and the rapid response when failing.

[0025] 6. The technical scheme of the utility model is not only suitable for the field of unmanned aerial vehicles, but also can be extended to other scenes (such as unmanned vehicles and industrial engines) that need high-reliability throttle valve control, and has universal application value. DRAWINGS

[0026] Figure 1It is a product front view of the electronic throttle valve with fault redundancy function in the embodiment of the utility model;

[0027] Figure 2 It is a product rear view of the electronic throttle valve with fault redundancy function in the embodiment of the utility model;

[0028] Figure 3 It is a product bottom view (remove the cover plate) of the electronic throttle valve with fault redundancy function in the embodiment of the utility model;

[0029] Figure 4 It is a return spring partial schematic view of the electronic throttle valve with fault redundancy function in the embodiment of the utility model.

[0030] The figure mark explanation: 1 - throttle valve body, 2 - butterfly piece, 3 - position sensor, 4 - drive motor, 5 - motor support, 6 - cover plate, 7 - throttle shaft, 8 - pinion, 9 - gear, 10 - adjusting screw, 11 - locking spring, 12 - return spring, 13 - snap spring, 14 - spring seat. DETAILED DESCRIPTION

[0031] The embodiment described below by referring to the drawings is exemplary, and is intended to explain the utility model, and can not be understood as the limitation of the utility model.

[0032] In the description of the utility model, it needs to be understood that the orientation or position relation indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" are based on the orientation or position relation shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore can not be understood as the limitation of the utility model.

[0033] Based on the engine stop or overheating problem caused by the return position fixation (such as minimum / maximum opening) in the prior art, the utility model provides an electronic throttle valve, which comprises a throttle valve body, the throttle valve body comprises a throttle body and a drive motor and a transmission assembly, a butterfly piece is rotationally connected in the stepped hole of the throttle body through a throttle shaft, and the drive motor controls the rotation angle of the throttle shaft and the butterfly piece through the transmission assembly; further comprising an adjustable mechanical redundancy module, the adjustable mechanical redundancy module is connected with the transmission assembly, the drive motor serves as the driving component of the throttle valve body when normally working, and the adjustable mechanical redundancy module serves as the driving component of the throttle valve body when in a fault state.

[0034] Specifically, the middle part of the throttle body is a stepped hole for installing a throttle shaft, one end of which is sealed with a cover plate, and the other end is provided with a position sensor on the flange of the throttle valve body, and the cover plate and the throttle valve body form a cavity for installing a transmission assembly and an adjustable mechanical redundancy module; the position sensor is used to collect the opening degree of the butterfly plate and send the collected information to the engine controller.

[0035] Specifically, the transmission assembly includes a pinion and a gear that are engaged with each other, the pinion is installed on the output shaft of the drive motor, and the gear is installed on one end of the throttle shaft.

[0036] Specifically, the drive motor is installed on the throttle body through a motor support, and its output shaft penetrates the housing and extends into the cavity to be coaxially connected with the pinion, serving as a power source for the pinion; the transmission assembly transmits the rotation angle to the throttle shaft and the butterfly plate.

[0037] Specifically, the adjustable mechanical redundancy module includes a return spring and a dynamic balance assembly; one end of the return spring is connected with the gear, and the other end is connected with the execution end of the dynamic balance assembly; the initial tension of the return spring is adjusted through the dynamic balance assembly to set the safe opening degree to which the electronic throttle resets in case of failure.

[0038] Specifically, the dynamic balance assembly includes an adjusting screw, a locking spring, and a spring seat; the rod part of the adjusting screw is provided with external threads, which is screwed on the throttle body through the threads, the end of the adjusting screw is hinged with the return spring, the head of the adjusting screw is located outside the throttle body, and the locking spring is sleeved on the rod part between the throttle body and the adjusting screw; by rotating the adjusting screw, the axial position of the end of the adjusting screw is changed, thereby adjusting the initial tension of the return spring; the locking spring applies continuous axial pressure to ensure that the adjusting screw does not rotate or displace after being set.

[0039] Specifically, the end of the adjusting screw is a stepped shaft structure, and the diameter of the end is smaller than the diameter of the middle rod part.

[0040] Specifically, the dynamic balance assembly further includes a spring seat, which is a circular ring structure sleeved on the stepped shaft of the end of the adjusting screw, and the lug provided on the outer periphery of the spring seat is hinged with the other end of the return spring; the spring seat and the adjusting screw are gap-fitted and can rotate relative to each other.

[0041] Specifically, a snap spring is sleeved on the small-diameter end of the adjusting screw and the outside of the spring seat, and the axial displacement of the spring seat is limited when the adjusting screw rotates by the snap spring.

[0042] Specifically, the central axes of the return spring and the adjusting screw are located in the same plane and are parallel to each other, and the rotation axis of the gear is perpendicular to the plane in which the central axes of the return spring and the adjusting screw are located.

[0043] The technical solutions are further described below with reference to the drawings:

[0044] In one embodiment, referring to Figure 1 , 2 , the throttle valve body 1, the butterfly plate 2, the position sensor 3, the drive motor 4, the motor support 5, and the cover plate 6 are included. The position sensor 3 is installed on the flange of the throttle valve body 1. The drive motor 4 is installed on the body of the throttle valve body 1 through the motor support 5. The butterfly plate 2 is installed in the stepped hole of the body of the throttle valve body 1 through the throttle shaft 7. The cover plate 6 is encapsulated at the mouth end of the cavity below the throttle valve body 1.

[0045] Specifically, the throttle body 1 of the throttle valve is the main housing, and the butterfly plate 2 is used to adjust the air flow entering the engine, thereby realizing the control of the engine power.

[0046] Specifically, the position sensor 3 is used to detect the position of the butterfly plate 2 and transmit the position signal to the engine controller.

[0047] Specifically, the drive motor 3 provides rotary power to adjust the position of the butterfly plate 2, and is installed on the housing below the throttle valve body 1 through the motor support 5.

[0048] In one embodiment, referring to Figure 3 , 4 , the small gear 8, the large gear 9, the adjusting screw 10, the locking spring 11, the return spring 12, the snap spring 13, and the spring seat 14 are installed in the cavity below the throttle valve body 1. The small gear 8 is installed on the output shaft of the drive motor. The large gear 9 is installed on one end of the throttle shaft 7 and engages with the small gear 8. The adjusting screw 10 is screwed on the cavity wall surface below the throttle valve body 1. The end of the adjusting screw 10 is provided with a stepped mechanism. The spring seat 14 is sleeved on the stepped surface. The axial displacement of the spring seat 14 is limited by the snap spring 13 and the stepped surface. The outer periphery of the spring seat 14 is connected with the lug and the return spring 12. One end of the return spring 12 is connected with the large gear 9, and the other end is connected with the lug of the return spring 12. The locking spring 11 is sleeved between the head of the adjusting screw 10 and the cavity wall surface of the throttle valve body 1.

[0049] Specifically, the spring seat 14 and the end of the adjusting screw 10 are clearance fitted. The spring seat 14 will not rotate with the adjusting screw 10, avoiding the distortion of the return spring 12. The axial position of the spring seat 14 is fixed by the snap spring 13 and the step on the adjusting screw 10, allowing the spring seat 14 to move up and down (in the direction of the view) with the adjusting screw 10. Figure 3

[0050] Specifically, the locking spring 11 ensures that the adjusting screw 10 is always in a tightened state and will not be loosened or displaced due to vibration.

[0051] ​In one embodiment, a method for adjusting the throttle opening of an electronic throttle valve in a normal operating state includes the following steps:

[0052] Step 1: Collect the current position angle of the throttle shaft through the position sensor to determine the position of the butterfly plate.

[0053] Step 2: Determine the rotation direction and angle of the drive motor by comparing the preset throttle opening with the current throttle opening position.

[0054] Step 3: Overcome the elastic force of the return spring through the drive motor, drive the pinion and gear to rotate, and then drive the throttle shaft and butterfly plate to rotate through the gear, completing the opening adjustment.

[0055] Step 4: Real-time detect the butterfly plate opening through the position sensor, and complete the throttle opening control when the preset opening is reached, allowing the engine to operate normally.

[0056] In one embodiment, a method for adjusting the safety position of an electronic throttle valve, the safety position refers to the preset throttle opening that can ensure the safety of the unmanned aerial vehicle and prevent it from stalling while ensuring the engine does not overheat for a long time in the event of abnormal conditions such as the throttle opening being unable to adjust. The size of the safety position is obtained through flight experience and design experience, and theoretically only needs to be set once. The specific steps are as follows:

[0057] Step 1: When on the ground, power off the drive motor, and keep the position sensor working state, the throttle shaft returns to the initial default position under the action of the return spring.

[0058] Step 2: Rotate the adjustment screw as needed until the throttle opening reaches the desired safety position.

[0059] Step 3: Write the throttle opening of the safety position into the engine controller.

[0060] Technical principle: Move the spring seat up and down through the rotation of the adjustment screw to change the initial position of the return spring. When the drive motor is powered off, the gear will rotate to the balance position under the action of the spring force, which is the above-mentioned safety position.

[0061] In one embodiment, a method for adjusting the throttle opening of an electronic throttle valve in a fault redundancy state: when the drive motor fails and is powered off, it is in a free state; the return spring controls the rotation of the gear to the preset safety position (balance position); at the same time, the position sensor measures the current position angle of the throttle shaft and outputs the engine controller; the engine controller normally controls the engine according to the received throttle opening information, ensuring normal flight of the unmanned aerial vehicle.

[0062] In one embodiment, a method for adjusting the throttle opening degree of an electronic throttle valve in a fault redundancy state: when the position sensor fails (the collected quantity exceeds the maximum and minimum range, etc.), the fault information is transmitted back to the engine controller; the engine controller controls the drive motor to be powered off and remains in a free state; the large gear is rotated to a preset safe position (balance position) by a return spring; the engine controller uses the preset safe position to control the engine to ensure normal flight of the unmanned aerial vehicle.

[0063] Safety warning

[0064] The electronic throttle valve with a fault redundancy function must be preset with a safe position according to the requirements of the unmanned aerial vehicle before use to avoid invalidation of the safety redundancy function.

[0065] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model, and the ordinary skilled in the art can change, modify, replace and transform the above-mentioned embodiments within the scope of the utility model without departing from the principles and purposes of the utility model.

Claims

1. An electronic throttle valve, comprising a throttle valve body, the throttle valve body comprising a throttle valve body and a driving motor, a transmission assembly, a butterfly piece being rotatably connected in a stepped hole of the throttle valve body through a throttle shaft, the driving motor controlling the rotation angle of the throttle shaft and the butterfly piece through the transmission assembly; characterized in that: The adjustable mechanical redundancy module is connected with the transmission assembly, the driving motor serves as a driving component of the throttle valve body in normal operation, and the adjustable mechanical redundancy module serves as a driving component of the throttle valve body in a fault state.

2. The electronic throttle according to claim 1, wherein: The middle part of the throttle body is a stepped hole for installing a throttle shaft, one end of which is sealed by a cover plate, and the other end is provided with a position sensor on a flange of the throttle valve body, and the cover plate and the throttle valve body form a cavity for installing the transmission assembly and the adjustable mechanical redundancy module; the position sensor is used for collecting the opening degree of the butterfly plate and sending the collected information to an engine controller.

3. The electronic throttle according to claim 2, wherein: The transmission assembly comprises a pinion and a gear wheel which are engaged with each other, the pinion is installed on the output shaft of the driving motor, and the gear wheel is installed on one end of the throttle shaft.

4. The electronic throttle according to claim 3, wherein: The driving motor is installed on the throttle body through a motor support, the output shaft of the driving motor penetrates the housing and is coaxially connected with the pinion in the cavity, serving as a power source of the pinion; and the transmission assembly is used for transmitting the rotation angle to the throttle shaft and the butterfly plate.

5. An electronic throttle valve according to claim 4, characterized in that: The adjustable mechanical redundancy module comprises a return spring and a dynamic balance assembly; one end of the return spring is connected with the gear wheel, and the other end is connected with an execution end of the dynamic balance assembly; the initial tension of the return spring is adjusted through the dynamic balance assembly, so as to set a safe opening degree to which the electronic throttle resets in a fault state.

6. An electronic throttle valve according to claim 5, characterized in that: The dynamic balance assembly comprises an adjusting screw, a locking spring and a spring seat; the rod part of the adjusting screw is provided with external threads, is screwed on the throttle body, and is hingedly connected with the return spring at the tail end thereof, the head part of the adjusting screw is located outside the throttle body, and the locking spring is sleeved on the rod part between the throttle body and the adjusting screw; the initial tension of the return spring is adjusted by rotating the adjusting screw to change the axial position of the tail end of the adjusting screw; and the locking spring is used for applying continuous axial pressure, so as to ensure that the adjusting screw does not rotate or displace after being set.

7. An electronic throttle valve according to claim 6, characterized in that: The tail end of the adjusting screw is in a stepped shaft structure, and the diameter of the tail end is smaller than the diameter of the middle rod part.

8. An electronic throttle valve according to claim 7, characterized in that: The dynamic balance assembly further comprises a spring seat, the spring seat is a circular ring structure sleeved on the stepped shaft of the tail end of the adjusting screw, lugs arranged on the outer periphery of the spring seat are hingedly connected with the other end of the return spring, the spring seat is clearance-fitted with the adjusting screw, and the spring seat can rotate relative to the adjusting screw.

9. An electronic throttle valve according to claim 8, characterized in that: A snap spring is sleeved on the small-diameter end of the adjusting screw and the outer side of the spring seat, and the axial displacement of the spring seat is limited when the adjusting screw rotates by the snap spring.

10. The electronic throttle according to claim 9, wherein: The central axes of the return spring and the adjusting screw are located in the same plane and are parallel to each other, and the rotation axis of the gear wheel is perpendicular to the plane in which the central axes of the return spring and the adjusting screw are located.

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