Idle speed control device of engine and engine

Abstract

The idle speed control device of the engine comprises a throttle valve and an idle speed control valve, the idle speed control valve is provided with an air inlet and two air outlets, two air inlet pipes are communicated with the throttle valve, the two air inlet pipes are communicated with air inlet channels of two air cylinders in a one-to-one correspondence mode, and the two air inlet pipes are communicated with air outlet channels of the two air cylinders in a one-to-one correspondence mode. Two air outlets of the idle speed control valve communicate with the two air inlet pipes in a one-to-one correspondence mode. According to the idle speed control device of the engine and the engine, the two air outlets of the idle speed control valve are communicated with the two air inlet pipes of the throttle valve in the one-to-one correspondence mode, reasonable distribution of air inflow of the two air cylinders in the idle speed state can be achieved, and the probability that the engine catches fire in the idle speed state is greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine, especially relates to an engine idling control device and engine. BACKGROUND

[0002] At present, double-cylinder engine generally uses double-chamber throttle valve body double-outlet pipe type intake, and the throttle valve is connected to two cylinders through two intake pipes. When the engine is in an idling state, the control mode of bypass intake is that air enters an inlet of an idling control valve, is output to an intake pipe through an outlet after being adjusted by the idling control valve, and the intake pipe is provided with an intake port in communication with the idling control valve. The intake of the intake port is transported to two intake pipes through two outlet holes, and the two outlet holes are in communication with each other. This mode can cause serious air stealing of two cylinders and can cause serious misfire to lead to unstable idling.

[0003] Therefore, it is necessary to improve the idling control device of the engine in the prior art. When the engine is in an idling state, the intake amount of two cylinders of the engine will not cause one cylinder to have excessive intake and the other cylinder to have insufficient intake, and misfire will not occur. SUMMARY

[0004] Therefore, the utility model discloses an engine idling control device and engine, when the engine is in an idling state, the intake amount of two cylinders of the engine will not cause one cylinder to have excessive intake and the other cylinder to have insufficient intake, and misfire will not occur.

[0005] The engine idling control device of the utility model, including throttle valve and idling control valve, the idling control valve has intake port and two gas outlets, and two intake pipes are arranged in communication with the throttle valve, two intake pipes and the intake passage of two cylinders are communicated one by one, and two gas outlets of the idling control valve are communicated one by one in two intake pipes.

[0006] Further, two bypass holes are arranged on the two intake pipes respectively, and the two bypass holes are not communicated with each other. The two bypass holes are communicated one by one in two gas outlets through a bypass pipe.

[0007] Further, the idling control valve comprises a valve body, the valve body is provided with a valve cavity, a plugging piece is arranged in the valve cavity, the plugging piece can be driven to move, so that the intake port and two gas outlets are communicated or not communicated.

[0008] Further, the valve cavity is provided with an intake chamber and two pressure stabilizing cavities, the intake chamber is communicated with the intake port, and the two pressure stabilizing cavities are communicated one by one with two gas outlets.

[0009] Further, the idle control valve further comprises a step motor, an output shaft of the step motor is connected with the blocking piece, and the step motor is used for driving the blocking piece to move.

[0010] Further, a diameter of the gas outlet is smaller than a diameter of the pressure stabilizing cavity, and a diameter of the gas inlet is smaller than a diameter of the gas inlet chamber.

[0011] The utility model discloses an engine, comprising the idle control device of engine.

[0012] The utility model discloses an engine, comprising the idle control device of engine. BRIEF DESCRIPTION OF DRAWINGS

[0013] The utility model will be further described in connection with the drawings and examples:

[0014] Figure 1 It is the structure schematic drawing of idle control device of engine in the prior art;

[0015] Figure 2 It is the structure schematic drawing of idle control device of engine in the prior art;

[0016] Figure 3 It is Figure 2 The partial section view of front view;

[0017] Figure 4 It is the explosion map when hiding step motor of the utility model;

[0018] Figure 5 It is Figure 3 The bottom view;

[0019] Figure 6 It is the section view of idle control valve;

[0020] Figure 7 It is the graph of misfire data of engine in the prior art and misfire data of engine of the utility model when being in idle state;

[0021] Among them, the above drawing contains following figure mark:

[0022] 1, idle control valve;2, throttle;3, bypass pipe;4, gas pipe;5, step motor;6, gas inlet;7, pressure stabilizing cavity;8, gas inlet chamber;9, bypass hole. DETAILED DESCRIPTION

[0023] Figure 1This is a schematic diagram of the structure of an engine idle speed control device in the prior art. Figure 2 This is a schematic diagram of the engine idle speed control device of this utility model. Figure 3 for Figure 2 A partial sectional view of the front view. Figure 4 This is an exploded view of the present invention when the stepper motor is concealed. Figure 5 for Figure 3 The bottom view, Figure 6 This is a cross-sectional view of the idle speed control valve. Figure 7 The graph shows the misfire data of an engine in the prior art and the misfire data of the engine of this invention when the engine is idling. Figures 1-7 As shown: The idle speed control device of the engine in this embodiment includes a throttle valve 2 and an idle speed control valve 1. The idle speed control valve 1 has an intake port 6 and two outlet ports. Two intake pipes 4 are connected to the throttle valve 2, and the two intake pipes 4 are connected to the intake passages of the two cylinders respectively. The two outlet ports of the idle speed control valve 1 are connected to the two intake pipes 4 respectively. In this structure, the engine is a V-type twin-cylinder engine. The throttle valve 2 is fixed to the two cylinders respectively through the two intake pipes 4 and is connected to the intake passages of the two cylinders respectively. The throttle valve 2 generally includes a valve body with two intake chambers. The valve body has a rotatable valve plate that divides the intake chambers into a front chamber and a rear chamber. The two front chambers are connected to the two intake pipes 4 respectively. This is an application of the prior art and will not be described in detail here.

[0024] Specifically, the two air outlets are connected one-to-one to the two air intake pipes 4. Thus, when the engine is idling, the air entering from the idle speed control valve 1 can be delivered one-to-one to the intake manifolds of the two cylinders. Compared to the prior art, where the air entering from the idle speed control valve 1 is delivered to the intake pipe of the throttle valve 2 through one air outlet, resulting in disordered distribution of air volume to the two cylinders and causing competition for air between the two cylinders, this structure can achieve reasonable distribution of air volume, preventing one cylinder from having a large intake volume while the other cylinder has a severely insufficient intake volume. This can significantly reduce the probability of misfire when the engine is idling and improve the stability of engine operation.

[0025] In this embodiment, each of the two intake pipes 4 is provided with a bypass hole 9. The two bypass holes 9 are not interconnected, and are connected to the two exhaust ports one-to-one through bypass pipes 3. There are two bypass pipes 3, and the two bypass holes 9 are connected to the two exhaust ports one-to-one through bypass pipes 3, thereby enabling the two cylinders to have relatively independent intake, so that the two cylinders will not interfere with each other during intake, thus reducing the probability of unstable idling speed of the engine.

[0026] In this embodiment, the idle speed control valve 1 includes a valve body with a valve chamber. A sealing element is provided within the valve chamber. The sealing element can be moved to connect or disconnect the air intake port 6 from the two air outlets. The air intake port 6 of the idle speed control valve 1 is connected to an air filter, and air enters the air intake port 6 through the air filter. The sealing element can be a cylindrical structure. The movement of the sealing element, driven by a screw or electromagnetic actuator, controls whether and to what extent the air intake port 6 connects to the two air outlets, thereby regulating the intake air volume and promoting stable engine operation.

[0027] In this embodiment, the valve cavity is provided with an air inlet chamber 8 and two pressure regulating chambers 7. The air inlet chamber 8 is connected to the air inlet 6, and the two pressure regulating chambers 7 are connected to the two air outlets in a one-to-one correspondence. The air inlet chamber 8 and the two pressure regulating chambers 7 are relatively independent, and the two pressure regulating chambers 7 are relatively independent (i.e., the two pressure regulating chambers 7 are not connected to each other), as shown below. Figure 6 As shown, when the idle speed control valve 1 is in the open state, the air entering from the intake chamber 8 enters the two pressure regulating chambers 7 respectively. At the same time, the pressure regulating chambers 7 are set up to stabilize the airflow and further reduce the occurrence of air snatching. By controlling the degree of connection between the intake chamber 8 and the two pressure regulating chambers 7, compared with the prior art, the air volume can be distributed to the two cylinders with a smaller opening. When more airflow wants to flow to one of the cylinders, the airflow is hindered by the smaller opening. Compared with the prior art, very little airflow will flow to one of the cylinders, thus making the intake volume of the two cylinders balanced and stabilizing the intake.

[0028] In this embodiment, the idle speed control valve 1 further includes a stepper motor 5. The output shaft of the stepper motor 5 is connected to the sealing component and is used to drive the sealing component to move. The stepper motor 5 is mounted on the valve body. The cooperative driving structure between the stepper motor 5 and the sealing component is an application of existing technology and will not be described in detail here. By driving the sealing component through the stepper motor 5, the overall structure is simple and reliable.

[0029] In this embodiment, the diameter of the air outlet is smaller than the diameter of the pressure stabilizing chamber 7, and the diameter of the air inlet 6 is smaller than the diameter of the air intake chamber 8; the diameter of the air outlet is smaller than the diameter of the pressure stabilizing chamber 7, so that the airflow is stabilized by the pressure stabilizing chamber 7 and then flows quickly to the throttle valve 2. The volumes of the air intake chamber 8 and the pressure stabilizing chamber 7 can be set according to the usage requirements.

[0030] The engine in this embodiment includes the aforementioned engine idle speed control device. The engine of this invention is a V-type twin-cylinder engine. By providing two non-communicating bypass holes 9 on the intake pipe 4, and connecting the two bypass holes 9 to the two outlets of the idle speed control valve 1 via two bypass pipes 3 respectively, a reasonable distribution of the intake air volume between the two cylinders can be achieved. Compared to existing technologies, this achieves a similar effect of even air distribution, significantly reducing the probability of misfire when the engine is idling. Figure 7 As shown in the figure, the optimized curve represents the misfire data of the engine of this utility model, while the unoptimized curve represents the misfire data of the engine of the prior art. When the vertical axis data is less than 1, the engine is in a misfire state. In the prior art, the misfire rate is 50% when the engine is idling. In this utility model, the misfire rate is 5% when the engine is idling, which can greatly improve the engine's operational stability.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An engine idle speed control device, characterized in that: It includes a throttle valve and an idle speed control valve. The idle speed control valve has an air inlet and two air outlets. It is connected to the throttle valve by two air intake pipes. The two air intake pipes are connected to the air intake passages of the two cylinders in a one-to-one correspondence. The two air outlets of the idle speed control valve are connected to the two air intake pipes in a one-to-one correspondence.

2. The engine idle speed control device according to claim 1, characterized in that: The two air inlet pipes are each provided with a bypass hole. The two bypass holes are not connected to each other. The two bypass holes are connected to the two air outlets one by one through the bypass pipes.

3. The engine idle speed control device according to claim 1, characterized in that: The idle speed control valve includes a valve body, the valve body has a valve cavity, and a sealing element is provided in the valve cavity. The sealing element can be driven to move, so that the air inlet is connected to or not connected to the two air outlets.

4. The engine idle speed control device according to claim 3, characterized in that: The valve chamber is provided with an air inlet chamber and two pressure regulating chambers. The air inlet chamber is connected to the air inlet, and the two pressure regulating chambers are connected to the two air outlets respectively.

5. The engine idle speed control device according to claim 3, characterized in that: The idle speed control valve also includes a stepper motor, the output shaft of which is connected to the sealing component and is used to drive the sealing component to move.

6. The engine idle speed control device according to claim 4, characterized in that: The diameter of the air outlet is smaller than the diameter of the pressure stabilizing chamber, and the diameter of the air inlet is smaller than the diameter of the air inlet chamber.

7. An engine, characterized in that: The idle speed control device for the engine as described in any one of claims 1-6.

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