Air throttle assembly and engine

Abstract

The utility model discloses an air throttle assembly and an engine, which comprise a valve body, the valve body is provided with at least one group of idling air holes used for leading idling air into the engine, the number of the idling air holes in one group is a plurality, and the number of the idling air holes in the other group is a plurality. The multiple idling air holes are distributed in the axial direction of the valve body and are overlapped with a set area. The adjusting device is used for sequentially closing or opening the plurality of idling air holes in each group so as to control the flow area of the idling air holes; according to the air throttle assembly and the engine, in the process that the stepping motor drives the adjusting head to adjust the idling air hole, it is guaranteed that the circulation area of the idling air hole can be increased or decreased gently, the air flow change of the idling air hole is more stable, and especially when the engine is in the idling state, the air throttle assembly can be used for adjusting the idling air hole. The stepping motor can control the area change of the idling air hole more controllably, and the running stability of the engine in the idling starting process is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine parts, especially to a throttle valve assembly and engine. BACKGROUND

[0002] The step motor is installed in a bypass channel of the throttle body, and the step motor adjusts the area of the idling air hole to control the air intake of the engine air intake pipe. Then, the intake pressure sensor transmits the sensed intake pressure to the ECU, the ECU judges the air intake or engine load, and then calculates the required fuel injection amount to control the idling power of the engine. When the engine is running, if the owner releases the accelerator pedal, the engine will enter the idling state. At this time, the engine speed is at idle speed, and the step motor adjusts the air intake to make the engine idle speed reach the best.

[0003] In the prior art, when the step motor moves up and down, the area of the single idling air hole changes unevenly, and the air flow of the bypass channel connected with the idling air hole cannot be increased or decreased smoothly, so that the engine speed fluctuates too much when starting idling, which affects the stability of the engine when starting idling.

[0004] Therefore, it is urgent to develop a throttle valve assembly, which can ensure that the flow area of the idling air hole can be increased or decreased smoothly during the adjustment of the idling air hole by the step motor drive adjustment head, and the air volume change of the idling air hole is more stable, especially in the idling state of the engine, the step motor can control the area change of the idling air hole more controllably, and the stability of the engine when starting idling is improved. UTILITY MODEL CONTENTS

[0005] Therefore, the purpose of the utility model is to provide a throttle valve assembly and engine, which can ensure that the flow area of the idling air hole can be increased or decreased smoothly during the adjustment of the idling air hole by the step motor drive adjustment head, and the air volume change of the idling air hole is more stable, especially in the idling state of the engine, the step motor can control the area change of the idling air hole more controllably, and the stability of the engine when starting idling is improved.

[0006] The throttle valve assembly of the utility model, including the valve body, be provided with the idling air hole for introducing the idling air into the engine on the valve body, the idling air hole is at least one group, the number of a group of idling air hole is several, several idling air hole is arranged along the axial direction of the valve body and has the overlap of the set area.

[0007] Adjusting device for closing or opening several idling air holes of each group in turn to control the flow area of the idling air hole.

[0008] Further, the adjusting device comprises a step motor and an adjusting head connected with the output shaft of the step motor, the step motor drives the adjusting head to move in and out to close or open the idle air holes of each group in turn, thereby controlling the flow area of the idle air holes.

[0009] Further, the valve body is provided with at least two air inlet parts between adjacent cylinder bodies, the air inlet part is provided with a mounting seat in communication with the air inlet part, the mounting seat is provided with a plurality of idle air holes with the same number as the valve body, and the flow area of the idle air holes is adjusted by the adjusting device to be gradually increased or decreased.

[0010] Further, the idle air holes are arranged on the valve body along the axial direction of the outer contour of the valve body from small to large in hole diameter, and the hole diameter ratio of adjacent idle air holes is 1.5-1.9.

[0011] Further, the mounting seat is used for mounting the adjusting device, the adjusting head is inserted into the mounting seat, and the adjusting head is driven by the step motor to move in and out in the mounting seat to control the change of the flow area of the idle air holes.

[0012] Further, the valve body is provided with a throttle plate on the inner cavity, and the idle air hole gas outlet on the valve body is located behind the throttle plate.

[0013] Further, a pair of buffer chambers symmetrical to the axis of the mounting seat is formed between the air inlet part and the mounting seat, the buffer chambers are in communication with the idle air holes on the mounting seat and the idle air hole gas outlets, and the idle air passage is formed.

[0014] Further, the idle air hole gas outlet on the valve body which is not integrally formed with the air inlet part is in communication with the idle air holes on the mounting seat through a bypass air pipe to form the idle air passage.

[0015] Further, the idle air holes are circular holes or / and special-shaped holes, in the opening process, the flow rate of the gas changes from small to large and then from large to small, in the same group of adjacent idle air holes, the position where the next idle air hole starts to intake in the opening process does not exceed the maximum flow rate position of the previous idle air hole.

[0016] Further, the idle air holes are circular holes, in the same group of adjacent idle air holes, the position where the next idle air hole starts to intake in the opening process does not exceed the center of the previous idle air hole.

[0017] The utility model also provides a kind of engine, the engine is installed with the above-mentioned throttle valve assembly.

[0018] The utility model discloses a beneficial effect: the utility model discloses the throttle valve assembly, in the process that the step motor drive adjusting head is adjusted to the idling air hole, guarantee the flow area of idling air hole can gently increase or reduce, and the gas volume change of idling air hole is more stable, especially under the idling state of engine, the area change control of step motor to idling air hole is more controllable, and the stability of engine operation is improved when starting idling. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model will be further described below in combination with the drawings and examples:

[0020] Figure 1 For the structure diagram of the utility model Figure I ;

[0021] Figure 2 For the structure diagram of the utility model Figure II ;

[0022] Figure 3 For the section of the utility model Figure I ;

[0023] Figure 4 For the section of the utility model Figure II ;

[0024] Figure 5 For the section of the utility model Figure III ;

[0025] Figure 6 For Figure 2 The local enlarged schematic view of

[0026] Figure 7 For the idling air hole flow change statistical table of the utility model

[0027] Figure 8 For the idling air hole flow change broken line graph of the utility model.

[0028] Reference signs in the drawing: 1, valve body;2, idling air hole;201, idling air hole I;202, idling air hole II;3, step motor;4, adjusting head;5, inlet part;6, mounting seat;7, throttle blade;8, buffer chamber;9, gas outlet;10, inlet pipe;11, bypass air pipe. DETAILED DESCRIPTION

[0029] The technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings in the utility model embodiment, and obviously, the described embodiment only is a part of the embodiment of the utility model, not all the embodiment.

[0030] In the description of the utility model, it is understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0031] Figure 1 Structure diagram of the utility model Figure I , Figure 2 Structure diagram of the utility model Figure II , Figure 3 Sectional view of the utility model Figure I , Figure 4 Sectional view of the utility model Figure II , Figure 5 Sectional view of the utility model Figure III , Figure 6 is Figure 2 The throttle valve assembly of the embodiment comprises a valve body 1, the valve body 1 is provided with idle air holes 2 for introducing idle air into the engine, the idle air holes 2 are at least one group, the number of the idle air holes 2 in one group is several, and the several idle air holes 2 are arranged along the axial direction of the valve body 1 and have a set area overlap; the throttle valve refers to a valve for controlling the flow rate of fluid by adjusting the fluid passage area, in the automobile engine, the throttle valve is responsible for controlling the air flow entering the engine, and is usually controlled by the driver through the accelerator pedal or the throttle pedal to realize the adjustment of the engine power and speed; the idle air refers to the air entering the engine cylinder when the engine is running at idle speed, the function of the idle air hole 2 is to change the flow area of the idle air passage according to the engine temperature and the load size when the engine is running at idle speed, control the amount of air entering the engine to adjust the idle speed to maintain the stable operation of the engine, so that the engine has the best idle speed under different conditions; the number of idle air holes 2 is more than one, the height of the plurality of idle air holes 2 is different, and the centers of the hole diameters are not on the same straight line along the axial direction, so that the flow area of the idle air hole 2 can increase or decrease gently, and the specific control principle is described in detail below, which is not described here; the several idle air holes 2 are arranged along the axial direction of the valve body 1 and have a set area overlap, the set area overlap refers to the projection in a certain direction perpendicular to the axial direction having an overlapping area, or directly projecting having an overlapping area.

[0032] An adjustment device is used to sequentially close or open several idle air ports 2 in each group, thereby controlling the flow area of ​​the idle air ports 2. The adjustment device can be an idle speed control valve (ISCV), a stepper motor type idle speed control valve, a rotary solenoid valve type idle speed control valve, etc. Since the stepper motor 3 can convert electrical pulses into corresponding angular or linear displacements, it has high positioning accuracy and motion repeatability. Each pulse corresponds to a fixed displacement, making idle speed control more precise and avoiding cumulative errors in the control process. It is more suitable for achieving the purpose of gradually increasing or decreasing the flow area of ​​the idle air ports 2. Therefore, the stepper motor type idle speed control valve is preferred.

[0033] In this embodiment, the adjustment device includes a stepper motor 3 and an adjustment head 4 connected to the output shaft of the stepper motor 3. The stepper motor 3 drives the adjustment head 4 to extend and retract, thereby controlling the change in the flow area of ​​the idle air hole 2. The stepper motor 3 can rotate forward or backward, thereby causing the adjustment head 4 to extend and retract, so as to adjust the flow area of ​​the idle air hole 2.

[0034] In this embodiment, there are at least two valve bodies 1, and an air intake 5 is provided between two adjacent cylinder bodies. The air intake 5 is provided with a mounting seat 6 communicating with it. The mounting seat 6 has a set of idle air holes 2, the same number as the valve bodies 1. The flow area of ​​the idle air holes 2 is adjusted by an adjusting device to gradually increase or decrease. Figure 1 As shown, this solution uses four valve bodies 1 as an example, which will be explained below. The operating principle of other combinations of valve bodies 1 is the same and will not be repeated here. Among the four valve bodies 1, the air intake 5 is set between two adjacent valve bodies 1. The arrangement of the air intake 5 can be based on the actual assembly space and is not limited here. The air intake 5 is set between two adjacent cylinder bodies. The air intake 5 can be integrally formed with the valve body 1. The integral forming process is relatively simple and can complete the required contour, holes, surface treatment, etc. in one mold, which greatly reduces production time. This reduces costs while improving the production precision and repeatability of parts. The air intake 5 is used to introduce idle air into the mounting base 6, which has idle air holes 2. The mounting base 6 and the air intake 5 are connected by bolts, which facilitates disassembly and assembly, and makes it easy to maintain, clean and replace the mounting base 6 later. Other mechanical connection methods can also be used, which will not be described in detail here. The mounting base 6 has four sets of idle air holes 2, which respectively replenish the idle air of the four valve bodies 1. The idle air holes 2 can be set parallel to the bottom height of the mounting base 6, making the overall structure more compact.

[0035] In this embodiment, the idle air ports 2 are arranged on the mounting base in ascending order of aperture, with the aperture ratio of adjacent idle air ports 2 being 1.5 to 1.9; Figure 4As shown, among the adjacent idle air holes 2, with the plane at the communication between the mounting seat 6 and the air inlet part 5 as the reference plane, the center point of the idle air hole with small aperture is higher than or equal to the height of the edge of the idle air hole with large aperture in the mounting seat 6, and is lower than the center height of the idle air hole with large aperture, so that the projection between the idle air hole with small aperture and the idle air hole with large aperture in the direction perpendicular to the axial direction has an overlapping area, which ensures that the flow area of the idle air hole 2 increases or decreases gently during the extension and retraction of the adjusting head 4.

[0036] In the embodiment, the mounting seat 6 is used for mounting the adjusting device, the adjusting head 4 is inserted into the mounting seat 6, and the adjusting head 4 is driven by the stepping motor 3 to control the change of the flow area of the idle air hole 2 in the mounting seat 6.

[0037] In the embodiment, the valve body 1 is provided with a throttle blade 7 on the inner cavity, and the air outlet 9 of the idle air hole 2 on the valve body 1 is located behind the throttle blade 7; the air outlet 9 of the idle air hole 2 is located behind the throttle blade 7, and when the engine is idling and the opening angle of the throttle blade 7 is small, the idle air introduced through the idle air hole 2 can be directly delivered to the engine through the air outlet 9.

[0038] In the embodiment, a pair of buffer chambers 8 symmetrical to the axis in the mounting seat 6 is formed between the air inlet part 5 and the mounting seat 6, the buffer chambers 8 are in communication with the idle air hole 2 on the mounting seat 6 and the air outlet 9 of the idle air hole 2, forming an idle air passage; the four-stroke engine includes four strokes of intake, compression, work and exhaust in the working cycle, in the intake stroke, the engine inhales the mixture of air and fuel, in this process, the engine needs to ensure that enough air enters the cylinder to form a proper air-fuel ratio to achieve effective combustion, if the intake is insufficient, i.e. the buffer is insufficient, it may cause the proportion of air in the mixture to decrease, affecting the combustion efficiency and the power output of the engine, by adding the buffer chamber 8, the idle air introduced through the idle air hole 2 is buffered to ensure sufficient intake, such as Figure 2 As shown, the buffer chamber 8 is formed between the air inlet part 5 and the mounting seat 6, which can make the overall assembly structure of the air inlet part 5 and the mounting seat 6 more compact, and when the buffer chamber 8 is maintained and cleaned later, only the mounting seat 6 needs to be removed, which is convenient to use.

[0039] In the embodiment, the air outlet 9 of the idle air hole 2 on the valve body without the air inlet part 5 is in communication with the idle air hole 2 on the mounting seat 6 through a bypass air pipe 11 to form an idle air passage; as Figure 1As shown, the air inlet part 5 is arranged between two adjacent cylinder blocks, and the air inlet part 5 can be integrally formed with the valve body 1, and the valve body without the air inlet part 5 refers to the valve body without being directly connected with the air inlet part 5, and the air inlet part 5 is provided with an air inlet pipe 10 in communication with the mounting seat 6, and the air inlet pipe 10 is used for conveying air into the mounting seat 6; as Figure 1 As shown, the arrangement direction of the bypass air pipe 11 is determined according to the actual assembly space, and is not limited here.

[0040] In this embodiment, the idle air holes are circular holes or / and special-shaped holes, and in the opening process, the change rate of the air flow changes from small to large and then from large to small, and in the same group of adjacent idle air holes, the position where the next idle air hole starts to intake air in the opening process does not exceed the position where the change rate of the air flow of the previous idle air hole is maximum; the idle air holes are circular holes, and in the same group of adjacent idle air holes, the position where the next idle air hole starts to intake air in the opening process does not exceed the center of the previous idle air hole.

[0041] The idle air holes 2 can be circular holes, square holes, special-shaped holes, etc., and are not limited here, and two circular idle air holes 2 are taken as an example in this scheme, which are an idle air hole I 201 with a hole diameter of 2 mm and an idle air hole II 202 with a hole diameter of 3.4 mm, and the hole diameter ratio is 1.7, of course, the number of idle air holes can be selected according to the idle air supplementing condition required by different types of engines, and taking the plane at the communication position of the mounting seat 6 and the air inlet part 5 as a reference plane, the idle air hole I 201 with a hole diameter of 2 mm and the idle air hole II 202 with a hole diameter of 3.4 mm are sequentially arranged upwards; the height difference between the centers of the two idle air holes and the reference plane is 2.3 mm; in the process that the adjusting head 4 moves from the edge of the idle air hole I 201 close to the bottom of the mounting seat 6 to the center of the idle air hole I 201, the flow area of the idle air hole I 201 increases gently, when the adjusting head 4 continues to move upwards from the center of the idle air hole I 201, the flow area of the idle air hole I 201 decreases gently, but since the position where the idle air hole II 202 starts to intake air does not exceed the center of the idle air hole I 201, when the adjusting head 4 continues to move upwards from the center of the idle air hole I 201, the flow area of the idle air hole II 202 increases with a gentle change rate, that is, increases gently, which is complementary to the decrease of the flow area change rate of the idle air hole I 201, so that after the adjusting head 4 moves through the center of the idle air hole I 201, the adjusting head 4 can continue to control the change of the overall flow area, so that the change of the idle air is more gentle, and at the same time, the high-precision rotation of the stepping motor 3 drives the high-precision expansion and contraction of the adjusting head 4, so that the idle air supplementing amount in the idle speed range is more controllable.

[0042] In this embodiment, as shown in Figure 7As shown in the table of idle hole flow rate change in each valve body 1, the idle hole I 201 and the idle hole II 202 are used respectively, and only a single idle hole 2 is used, and the scheme is four valve bodies 1, the valve bodies 1 using the idle hole I 201 and the idle hole II 202 in the above scheme are sequentially labeled as N1, N2, N3, N4, and the valve bodies 1 using a single idle hole 2 are sequentially labeled as O1, O2, O3, O4.

[0043] As shown in the table of idle hole flow rate change in each valve body 1, the idle hole I 201 and the idle hole II 202 are used respectively, and only a single idle hole 2 is used, and the scheme is four valve bodies 1, the valve bodies 1 using the idle hole I 201 and the idle hole II 202 in the above scheme are sequentially labeled as N1, N2, N3, N4, and the valve bodies 1 using a single idle hole 2 are sequentially labeled as O1, O2, O3, O4. Figure 8 As shown in the table of idle hole flow rate change in each valve body 1, the idle hole I 201 and the idle hole II 202 are used respectively, and only a single idle hole 2 is used, and the scheme is four valve bodies 1, the valve bodies 1 using the idle hole I 201 and the idle hole II 202 in the above scheme are sequentially labeled as N1, N2, N3, N4, and the valve bodies 1 using a single idle hole 2 are sequentially labeled as O1, O2, O3, O4.

[0044] In the embodiment, an engine is also provided, and the throttle valve assembly is mounted on the engine, and in the process of driving the adjusting head 4 to adjust the idle hole 2 by the stepping motor 3, the flow area of the idle hole 2 can be increased or decreased gently, the air volume of the idle hole 2 changes more stably, especially in the idle state of the engine, the control of the stepping motor 3 on the area change of the idle hole 2 is more controllable, and the stability of the engine in the starting idle state is improved.

[0045] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the utility model and not to limit, although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the utility model can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions of the utility model, and all of them should be covered in the scope of the claims of the utility model.

Claims

1. A throttle valve assembly, characterized in that: Includes a valve body, on which an idle air port for introducing idle air into the engine is provided. The idle air port is at least one set, and the number of idle air ports in one set is several. The several idle air ports are arranged along the axial direction of the valve body and have an overlapping area of ​​a set area. An adjustment device is used to sequentially close or open several idle air holes in each group, thereby controlling the flow area of ​​the idle air holes.

2. The throttle valve assembly according to claim 1, characterized in that: The adjustment device includes a stepper motor and an adjustment head connected to the output shaft of the stepper motor. The stepper motor drives the adjustment head to extend and retract, sequentially closing or opening several idle air holes in each group, thereby controlling the flow area of ​​the idle air holes.

3. The throttle valve assembly according to claim 1, characterized in that: The valve body comprises at least two valve bodies, with an air intake section provided between two adjacent valve bodies. The air intake section is provided with a mounting seat communicating with the air intake section. The mounting seat has a set of idle air holes with the same number as the valve bodies. The flow area of ​​the idle air holes is adjusted by an adjusting device to gradually increase or decrease. The mounting seat is used to install the adjusting device. The adjusting head is inserted into the mounting seat and driven by a stepper motor to extend and retract within the mounting seat to control the change in the flow area of ​​the idle air holes.

4. The throttle valve assembly according to claim 1, characterized in that: The idle air ports are arranged on the valve body along the axial direction of the valve body's outer contour, with the diameter increasing from small to large. The diameter ratio of adjacent idle air ports is 1.5 to 1.

9.

5. The throttle valve assembly according to claim 1, characterized in that: The valve body has a throttle plate on its inner cavity, and the idle air outlet on the valve body is located behind the throttle plate.

6. The throttle valve assembly according to claim 3, characterized in that: The air intake and the mounting form a pair of buffer chambers symmetrical about the central axis of the mounting base. The buffer chambers are connected to the idle air port and the idle air port outlet on the mounting base to form an idle passage.

7. The throttle valve assembly according to claim 5, characterized in that: The valve body includes a valve body without an air inlet and a valve body with an air inlet. The idle air outlet on the valve body without an air inlet is connected to the idle air outlet on the mounting base through a bypass air pipe to form an idle air channel.

8. The throttle valve assembly according to claim 1, characterized in that: The idle air vent is a circular or / and irregularly shaped vent. During the opening process, the rate of change of airflow increases from small to large and then decreases again. Among adjacent idle air vents in the same group, the maximum rate of change of airflow of the preceding idle air vent does not exceed the position where the following idle air vent begins to intake air during the opening process.

9. The throttle valve assembly according to claim 8, characterized in that: The idle air vent is a circular vent. In adjacent idle air vents in the same group, the center of the previous idle air vent does not exceed the position where the next idle air vent begins to intake air during the opening process.

10. An engine, characterized in that: The engine is equipped with a throttle valve assembly as described in any one of claims 1-9.

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