WO2020083306A1

WO2020083306A1 - Automatic air valve control system for gasoline engine and gasoline engine

Info

Publication number: WO2020083306A1
Application number: PCT/CN2019/112711
Authority: WO
Inventors: 郭宁; 冯宇
Original assignee: 苏州科瓴精密机械科技有限公司
Priority date: 2018-10-24
Filing date: 2019-10-23
Publication date: 2020-04-30
Also published as: CN109184960B; CN109184960A

Abstract

An automatic air valve control system for a gasoline engine (100), the gasoline engine (100) comprising a carburetor (20), and a cylinder (30) connected to the carburetor. A throttle (24) is provided in the carburetor (20). An air intake channel (21) is provided between the carburetor (20) and the cylinder (30), the air intake channel (21) being provided with an air inlet. The automatic air valve control system comprises a choke valve (23), a power unit for driving the choke valve (23), a controller connected to the power unit, and a temperature detection unit connected to the controller. The choke valve (23) is used to open or close the air inlet. The power unit comprises a servomotor (22). The choke valve (23) connects to an elastic component (233). The temperature detection unit is used to detect the temperature of the cylinder (30), and when the detected temperature is less than a preset temperature, the controller controls the servomotor (22) to drive the choke valve (23) to rotate in a first direction to close the air inlet. The elastic component (233) stores energy. The throttle (24) opens to a first present angle in response to the rotation of the choke valve (23). Starting of the gasoline engine (100) causes the throttle (24) to open to a second preset angle, and elastic energy of the elastic component (233) is released, driving the choke valve (23) to open the air inlet.

Description

Automatic damper control system of gasoline engine and gasoline engine

Technical field

The invention relates to an automatic air door control system of a gasoline engine and a gasoline engine.

Background technique

At present, the intake system of the gasoline engine used for garden tools includes air filters, choke valves, carburetor, intake pipes, and valves. Its main role is to mix air and fuel through a certain proportion of vaporization of the carburetor into The combustible gas enters the combustion chamber through the intake passage. In the prior art intake system, air enters the throat of the carburetor through an air filter and a choke valve. The air filter functions to filter the air. The choke valve is used to regulate and control the flow of air into the carburetor. At the throat of the carburetor, there is a device to adjust the fuel flow into the throat. The air and fuel are at the throat. Due to the venturi effect, the fuel vaporizes and mixes with the air to form a combustible mixture. This combustible mixture then It finally enters the combustion chamber through the carburetor and intake duct and intake valve.

When the portable gasoline engine starts, especially when the ambient temperature is low, in order to facilitate the start of the gasoline engine, the fuel concentration in the fuel mixture drawn into the combustion chamber needs to be increased. You need to reduce the amount of air drawn into the carburetor.

At present, engines with pre-fueled carburetor on the market generally close the choke valve manually and open the pre-fueled valve when the engine is started to increase the concentration of gasoline in the engine and facilitate engine starting. Its operation is complicated and inconvenient.

technical problem

The purpose of the present invention is to provide an automatic damper control system for a gasoline engine that is easy to operate.

Another object of the present invention is to provide a gasoline engine that is easy to operate.

Technical solution

In order to achieve the above object of the invention, the present invention provides an automatic damper control system for a gasoline engine. The gasoline engine includes a carburetor and a cylinder connected to the carburetor. The carburetor is provided with an accelerator. The carburetor and the cylinder There is an air intake channel between the air intake channel, the automatic damper control system includes a choke valve, a power unit driving the choke valve, a controller connected to the power unit, and a temperature detection unit connected to the controller, The choke valve is used to open or close the air inlet, the power unit includes a steering gear, the choke valve is connected to an elastic element, and the temperature detection unit is used to detect the temperature of the cylinder when the detected temperature Below the preset temperature, the controller controls the steering gear to drive the choke valve to rotate in the first direction to close the air inlet, the elastic element stores energy, and the throttle opens in response to the rotation of the choke valve The first preset angle; the start of the gasoline engine causes the throttle to open a second preset angle, and the elastic release of the elastic element drives the choke valve to open the air inlet.

As a further improvement of an embodiment of the present invention, the power unit further includes a transmission mechanism driven by the steering gear, and the transmission mechanism includes a first spur gear connected to the steering gear and a second spur gear meshed with the first spur gear, The second spur gear drives the choke valve to rotate along the same axis.

As a further improvement of an embodiment of the present invention, the transmission mechanism further includes a damper shaft driven by the second spur gear, and the choke valve is connected to the damper shaft.

As a further improvement of an embodiment of the present invention, the throttle is connected to the throttle shaft, the second spur gear drives the throttle to close through the throttle shaft; the throttle shaft drives the throttle shaft to rotate through the driving structure to open the throttle.

As a further improvement of an embodiment of the present invention, the driving structure includes a first claw fixedly connected to the throttle shaft and a second claw fixedly connected to the throttle shaft, the first claw rotates with the throttle shaft to drive The second claw drives the throttle shaft to rotate.

As a further improvement of an embodiment of the present invention, the gasoline engine is started, and the controller controls the throttle shaft to rotate so that the throttle opens a second preset angle, and the second preset angle is greater than the first preset angle, The second claw is separated from the first claw under the driving of the throttle shaft, and the elastic element acts on the first claw to drive the throttle shaft to cause the choke valve to open the air inlet.

As a further improvement of an embodiment of the present invention, a throttle spring is connected to the throttle shaft, and the throttle spring provides an elastic force for the throttle shaft to drive the throttle from an open position to a closed position.

As a further improvement of an embodiment of the present invention, the damper shaft is provided with a slot that penetrates the damper shaft in the radial direction, and the choke valve is installed in the slot.

The invention also provides an automatic damper control system for a gasoline engine, which includes a choke valve for opening or closing the air inlet, a power unit driving the choke valve, a controller connected to the power unit, and a throttle provided in the carburetor. The choke valve is connected to a reset element, the controller controls the power unit to drive the choke valve to rotate in the first direction to close the air inlet, and the choke valve and the throttle establish a single unit in the first direction under the action of the power unit Drive connection, the throttle opens at a first preset angle, the choke is restricted to rotate in a second direction opposite to the first direction; the throttle opens at a second preset angle, the single choke and throttle The direction transmission connection is disconnected, and the reset element drives the choke valve to rotate in the second direction to open the air inlet.

As a further improvement of an embodiment of the present invention, the power unit includes a steering gear, a transmission mechanism driven by the steering gear, and a damper shaft connected to the transmission mechanism, the damper is installed on the damper shaft, and the transmission mechanism is along The first direction is drivingly connected to the damper shaft, and is disconnected from the damper shaft within a preset range along the second direction.

As a further improvement of an embodiment of the present invention, the transmission mechanism includes a first spur gear driven by a steering gear and a second spur gear that meshes with the first spur gear, and the end surface of the second spur gear is provided with a limiting groove, One end of the damper shaft is connected to a transmission member, and the transmission member is disposed in the limiting groove and can rotate relative to the second spur gear along the limiting groove, and the second spur gear rotates through in the first direction The transmission member drives the damper shaft to rotate; the second spur gear rotates in a predetermined range corresponding to the limit slot along the second direction, and the transmission member The second spur gear moves relatively.

As a further improvement of an embodiment of the present invention, the throttle is connected to the throttle shaft, and a drive structure is provided between the choke and the throttle; the choke is linked to the drive structure and drives the throttle shaft through the drive structure Rotate to open the throttle by the first preset angle.

As a further improvement of an embodiment of the present invention, the driving structure includes a first claw fixedly connected to the throttle shaft and a second claw fixedly connected to the throttle shaft, the first claw rotates with the throttle shaft to The second claw is driven, and the second claw drives the throttle shaft to rotate.

As a further improvement of an embodiment of the present invention, the second claw is provided with a self-locking structure that restricts the rotation of the choke valve in the second direction. The self-locking structure includes a stepped portion provided on the second claw. A claw abuts on the stepped portion to drive the second claw, the stepped portion restricts the first claw to rotate and reset in the second direction, and the throttle shaft drives the second claw and the first claw Disengaged, the first claw is allowed to rotate and reset in the second direction.

The invention also relates to a gasoline engine, which includes a casing, a cylinder arranged in the casing, a piston reciprocating in the cylinder, a crankshaft driving the piston to reciprocate, a drive motor that drives the crankshaft when starting, a fuel tank for storing fuel, and a The carburetor between the cylinder and the fuel tank, the gasoline engine further includes the automatic damper control system as described in any one of the above embodiments.

As a further improvement of an embodiment of the present invention, the gasoline engine further includes an air filter connected to the air inlet, the air filter includes an air filter housing connected to the housing, and an air filter disposed between the air filter housing and the housing A filter base, the steering gear and the transmission mechanism are installed on the air filter base.

As a further improvement of an embodiment of the present invention, the controller judges the temperature detected by the temperature detection unit according to the startup of the drive motor, and controls the servo to start when the detected temperature is lower than a preset value .

The invention also relates to an automatic damper control method of a gasoline engine, which is characterized by comprising the following steps:

Get the temperature of the cylinder;

When the temperature of the cylinder is less than the preset temperature, the controller sends a drive signal to the power unit, the drive signal is a signal that controls the power unit to drive the choke valve to rotate the preset angle in the first direction and reset the power unit. The air inlet is closed under the action, and the throttle opens the first preset angle under the action of the one-way transmission connection of the choke valve;

Control the throttle to open a second preset angle, the second preset angle is greater than the first preset angle, the throttle and the choke valve are disconnected from the one-way transmission, and the choke valve is reset to open the air inlet.

As a further improvement of an embodiment of the present invention, the controller obtains the temperature of the cylinder based on the start of the engine.

Beneficial effect

Compared with the prior art, the automatic damper control system and gasoline engine provided by the present invention can effectively make a judgment according to the change of the cylinder temperature and realize the opening or closing of the pre-fueling valve of the carburetor. When the lock structure is unlocked, the choke door will be restored to the open state, thereby realizing the automation of the entire process, which can greatly simplify people's operations and facilitate people's use.

BRIEF DESCRIPTION

1 is a schematic cross-sectional view of a gasoline engine in a preferred embodiment of the present invention;

FIG. 2 is an enlarged schematic view of part a in FIG. 1;

3 is a partial perspective exploded view of the gasoline engine in FIG. 1;

4 is a front view of the automatic damper control system and the automatic damper control system of the gasoline engine in FIG. 1;

5 is a perspective schematic view of a part of the automatic damper control system in FIG. 4;

6 is a perspective exploded schematic view of the automatic damper control system in FIG. 5;

7 is a schematic plan view of the automatic damper control system in FIG. 5;

8 is a schematic cross-sectional view taken along line A-A in FIG. 7;

9 is a perspective schematic view of the automatic damper control system in an initial state;

10 is a schematic cross-sectional view taken along line B-B in FIG. 7;

FIG. 11 is a perspective schematic view of the automatic damper control system in a state where the servo is activated;

Fig. 12 is similar to Fig. 10, in which the automatic damper control system is in a state where the servo is activated;

13 is a perspective schematic view of the automatic throttle control system in the state of pre-fueling;

Figure 14 is similar to Figure 10, in which the automatic damper control system is in the state of pre-fueling;

15 is a perspective schematic view of the automatic damper control system in the reset state of the servo;

Figure 16 is similar to Figure 10, where the automatic damper control system is in the servo reset state;

17 is a perspective schematic view of an automatic throttle control system in the state of increasing the throttle;

Fig. 18 is similar to Fig. 10, in which the automatic damper control system is in the state of increasing the throttle.

Reference mark:

100. Gasoline engine; 10. Shell; 20. Carburettor; 30. Cylinder; 21. Intake passage; 22. Steering gear; 23. Choke door; 24. Throttle; 221. First spur gear; 222. Second Spur gear; 231. throttle shaft; 232. first jaw; 233. damper spring; 235. slotted; 241. throttle shaft; 242. second jaw; 243. throttle spring; 40. crankcase; 41. crankshaft; 42 Piston; 43. Spark plug; 50. Drive motor; 60. Fuel tank; 70. Silencer; 80. Air filter; 81. Air filter housing; 82. Air filter base.

Embodiments of the invention

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. However, these embodiments do not limit the present invention, and structural, method, or functional changes made by those of ordinary skill in the art according to these embodiments are all included in the protection scope of the present invention.

It should be understood that the terms such as "upper", "upper", "lower", "lower", etc. used herein to indicate the relative position of the space are used for describing purposes to describe a unit or feature as shown in the drawings. Relationship to another unit or feature. The term spatial relative position may be intended to include different orientations of the device other than those shown in the figures during use or operation.

As shown in FIGS. 1 to 5, a preferred embodiment of the present invention is introduced. In this embodiment, the gasoline engine 100 will be described as an example. The gasoline engine 100 includes a carburetor 20 and a cylinder 30 connected to the carburetor 20. An intake passage 21 is provided between the carburetor 20 and the cylinder 30, the intake passage 21 has an intake port, and the carburetor 20 is provided with an throttle 24 . The gasoline engine also includes an automatic damper control system, which includes a choke valve 23, a power unit driving the choke valve 23, a controller connected to the power unit, and a temperature detection unit connected to the controller. The choke valve 23 is used to open or close the intake air mouth. The power unit includes a steering gear 22, a choke valve 23 is connected to an elastic element 233, and a temperature detection unit is used to detect the temperature of the cylinder 30. When the detected temperature is lower than a preset temperature, the controller controls the steering gear 22 to rotate and drive the choke valve 23 along the first Rotate in one direction to close the air inlet, the elastic element 233 stores energy, the throttle 24 opens the first preset angle in response to the rotation of the choke valve 23; the gasoline engine starts to open the throttle at the second preset angle, and the elastic element 233 releases the elastic force to drive the choke valve 23 Open the air inlet.

In this embodiment, the power unit further includes a transmission mechanism driven by the steering gear 22. The transmission mechanism includes a first spur gear 221 connected to the steering gear and a second spur gear 222 meshed with the first spur gear. The second spur gear 222 drives The choke valve 23 rotates along the same axis, that is, the second spur gear 222 drives the choke valve 23 to rotate to open or close the air inlet. The spur gear refers to a standard straight tooth cylindrical gear, which is used for gear transmission, and there are teeth on the rim of the gear to continuously mesh and transmit motion and power.

The temperature detection unit detects the temperature of the cylinder 30 to determine whether the gasoline engine is in a cold start state, that is, when the detected temperature of the cylinder 30 is lower than the preset temperature, it is confirmed as a cold start, and when the cold start The steering gear controls to close the damper and pre-fuel the throttle, and the damper will automatically open after starting. The controller controls the steering gear 22 to drive the first spur gear 221 and the second spur gear 222 to rotate to realize the choke valve 23 to close the intake port, so as to reduce the amount of air drawn into the carburetor 20, thereby increasing the intake of the combustion chamber in the cylinder 30 The fuel concentration in the fuel mixer is convenient for the start of the gasoline engine, which can greatly simplify people's operation and facilitate people's use.

Preferably in this embodiment, the transmission mechanism further includes a damper shaft 231 driven by the second spur gear 222, and the choke valve 23 is fixedly or detachably connected to the damper shaft 231. The damper shaft 231 is installed in the intake passage 21, the steering gear 22 drives the first spur gear 221 and the second spur gear 222 to rotate, the second spur gear 222 drives the damper shaft 231, and the damper shaft 231 is provided with a through-throttle shaft in the radial direction The slot 235 and the choke door 23 are installed in the slot 235. The steering and rotation speed of the steering gear 22 can be controlled by the controller to control the rotation angle of the choke door 23 to adjust the air intake amount.

In addition, the throttle 24 is fixedly connected to the throttle shaft 241, and the second spur gear 222 drives the choke valve 23 to close through the throttle shaft 231; the throttle shaft 231 drives the throttle shaft 241 to rotate through the driving structure to open the throttle 24. Specifically, the driving structure includes a first claw 232 fixedly connected to the throttle shaft 231 and a second claw 242 fixedly connected to the throttle shaft 241. The first claw 232 rotates with the throttle shaft 231 to drive the second claw 242. The two claws 242 drive the throttle shaft 241 to rotate. Specifically, the elastic element 233 is a damper spring connected to the damper shaft 231. The damper spring is configured as a torsion spring. One end of the torsion spring is connected to the first claw 232, and the other end of the torsion spring is connected to the throttle shaft 241. When the damper 23 is closed, the first claw 232 drives one end of the torsion spring to rotate together, and the torsion spring is charged; when the throttle is opened, the elastic release of the torsion spring drives the first claw 232 and then drives the damper shaft 231 to open the damper 23, that is, the damper The spring provides an elastic force that the damper shaft 231 drives the choke valve 23 from the closed position to the open position. A throttle spring 243 is connected to the throttle shaft 241. The throttle spring 243 may also be configured as a torsion spring to provide the elastic force of the throttle 241 shaft to drive the throttle 24 from the open position to the closed position.

5 to 8, the second spur gear 222 is provided with a limit groove 226, the damper shaft 231 and the second spur gear 222 are in clearance fit, and a pin shaft 236 and a pin shaft 236 are radially inserted into the damper shaft 231 Cooperate with the limit groove 226 and rotate within the range defined by the limit groove 226, that is, the second spur gear 222 drives the damper shaft 231 to rotate in the first direction through the pin 236, and when the second spur gear 222 is in If the range defined by the position slot 226 rotates in the second direction opposite to the first direction, the damper shaft 231 will not rotate along the second direction along with the second spur gear 222 within the range defined by the limit slot 226.

The cross-sectional structure of the limiting groove 226 is two symmetrically arranged sectors, the end of the damper shaft 231 is inserted into the center hole of the second spur gear 222, and the pin shaft 236 is locked in the limiting groove 226 and can be along the limiting The position groove 226 rotates relative to the second spur gear 222 within a predetermined range, and the pin shaft 236 simultaneously realizes the axial installation positioning between the damper shaft 231 and the second spur gear 222. The initial position of the pin shaft 236 is in contact with the first side groove wall 2261 of the limiting groove 226, so that the second spur gear 222 can drive the pin shaft 236 to rotate along with it in the first direction through the groove wall of the limiting groove 226; When the second spur gear 222 is reset in the second direction under the action of the steering gear 22, the pin shaft 236 is separated from the first side groove wall 2261, and the second spur gear 222 rotates to the second position between the pin shaft 236 and the limit groove 226 Where the side groove wall 2262 abuts, during this process, the rotation of the second spur gear 222 cannot be transmitted to the pin 236. Through the cooperation of the pin shaft 236 and the limit groove 226, the pin shaft 236 serves as a transmission member to transmit the rotation of the second spur gear 222 to the damper shaft 231, so that the transmission mechanism can be connected to the damper shaft in the first direction, and along the first The two directions are disconnected from the damper shaft within the preset range.

In addition, the end of the damper shaft 231 is formed with a flat square 238, the pin shaft 236 is passed through the flat square 238, and another shift fork 228 is installed on the flat square 238, which is located between the body of the damper shaft 231 and the pin shaft 236 For easy positioning. The shift fork 228 can be driven to rotate by the damper shaft 231, and then the shift fork 228 rotates the first claw 232 to rotate in the first direction. When the first claw 232 is reset under the action of the elastic element 233, the first claw 232 drives the damper shaft 231 to rotate in the second direction through the shift fork 228.

In this embodiment, the first claw 232 rotates in the first direction to drive the second claw 242, and the second claw 242 is fixedly installed relative to the throttle shaft 241, so the second claw 242 drives the throttle shaft 241 to rotate, and then the throttle shaft 241 drives the throttle Rotate to open the first preset angle, which is the pre-fuel valve. A self-locking structure for self-locking the choke door 23 is also formed between the first claw 232 and the second claw 242, and the self-locking structure can be unlocked by way of a gas throttle. Specifically, the portion where the second claw 242 cooperates with the first claw 232 is provided with a stepped portion, including a first stepped surface 2421 and a second stepped surface 2422, the first claw 232 rotates first to contact the first step of the second claw 242 With the further rotation of the first claw 232, the first claw 232 crosses the first step surface 2421 and then abuts the second step surface 2422, and the elastic element connected to the first claw 232 stores energy; when the second spur gear 222 No longer drives the damper shaft 231 to rotate in the first direction and the second spur gear 222 rotates to reset in the second direction, the first claw 232 also has a tendency to rotate in the second direction under the action of the elastic element, and the first step surface 2421 and The connecting surface between the second stepped surface 2422 prevents the first claw 232 from rotating in the second direction, that is, the stepped portion on the second claw 242 forms a self-locking structure that locks the first claw 242 so that the first claw 232 and the second Only one-way transmission of rotary motion can be performed between the claws 242, so that the choke valve 23 is always closed. When the carburetor 20 is fueled, the throttle shaft 241 rotates to open the throttle by a second preset angle, the second claw 242 Driven by the throttle shaft 241, continue to rotate in the opening direction First separating pawl 232, first pawl 232 of the lock is released, so that the first pawl 232 to drive the damper shaft driven by the elastic member 231 rotates in a second direction, so that the choke valve 20 opens. In other words, when the gasoline engine is to be started, the steering mechanism 22 can be used to drive the transmission mechanism to close the choke door 23. Once the choke door 23 is closed in place, the servo 22 reverses and resets, and the servo 22 is disconnected from the transmission mechanism. And the choke door 23 is kept in the closed state under the action of the self-locking structure. Once the gasoline engine is started, after the carburetor 20 is fueled, the self-locking structure is unlocked, and the choke door 23 will return to the open state, thereby automating the entire process.

The starting process of the gasoline engine will be described in detail below based on the drawings.

As shown in FIGS. 9 and 10, in the initial state of the gasoline engine, the steering gear 22 is at the initial angle, the choke valve 23 is opened, the throttle 24 is closed, the first claw 232 and the second claw 242 are in a state of being separated from each other, and the pin 236 and the limit The first side groove wall 2261 of the bit groove 226 abuts. The dotted line Y and the dotted line Z in the figure show the opening degrees of the throttle valve 24 and the choke valve 23, respectively.

As shown in FIGS. 11 and 12, the temperature detection unit detects that the temperature of the cylinder 30 is lower than the preset temperature, the controller controls the steering gear 22 to start, and the steering gear 22 drives the first spur gear 221 to rotate clockwise in the direction of the arrow shown in the figure. In turn, the second spur gear 222 rotates counterclockwise. The second spur gear 222 drives the throttle shaft 231 counterclockwise through the pin 236. The first claw 232 of the throttle shaft 231 abuts the second claw 242 of the throttle shaft 241, so that The two claws 242 can drive the throttle shaft 241 to rotate.

As shown in FIGS. 13 and 14, the steering gear 22 continues to rotate to a preset angle. At this time, the choke valve 23 is closed, the second claw 242 drives the throttle shaft 241 to rotate, and the throttle shaft 241 drives the throttle 24 to open the first preset angle. The elastic element 233 stores energy.

As shown in FIGS. 15 and 16, the steering gear 22 reverses back to the initial angle after reaching the preset angle. Since the pin shaft 236 rotates in the limit groove 226, the throttle shaft 231 cannot be driven, and the throttle valve 24 and the choke valve 23 remain If it does not move, the start preparation is completed (ie the choke is closed and the pre-fuel valve is closed).

As shown in FIGS. 17 and 18, when the gasoline engine is successfully started, increase the throttle 24 (the throttle shaft rotates clockwise), the throttle 24 opens a second preset angle, so that the second claw 242 of the throttle shaft 241 no longer abuts the throttle The first claw 232 of the shaft 231, the damper shaft 231 returns to the initial state under the action of the elastic element 233, and the damper 23 automatically opens.

According to the above description, the automatic damper control method of the gasoline engine of the present invention includes the following steps:

Obtain the temperature of the cylinder 30;

When the temperature of the cylinder 30 is less than the preset temperature, the controller sends a driving signal to the steering gear 22, the driving signal is preferably a signal that controls the steering gear to rotate a preset angle in a preset direction and reset, so that the choke door 23 is on the steering gear 22 The air inlet is closed under the action, and the throttle 24 opens the first preset angle under the action of the choke valve 23 unidirectional transmission connection;

The throttle valve 24 is controlled to open a second preset angle, the second preset angle is greater than the first preset angle, the throttle valve 24 and the choke valve 23 are disconnected from the one-way transmission connection, and the choke valve 21 is reset to open the air inlet.

Further, the controller obtains the temperature of the cylinder based on the start of the engine.

The linkage setting between the choke valve and the damper makes the automatic damper control of the gasoline engine easier, thereby reducing the cost of the gasoline engine.

The present invention also relates to a gasoline engine having the above-mentioned automatic damper control system. The gasoline engine includes a housing 10, a cylinder 30 and a carburetor 20 are both disposed in the housing 10, and a reciprocating piston 42 is provided in the cylinder 30. There is also a spark plug 43 for ignition, the piston 42 is driven by the reciprocating motion of the crankshaft 41, wherein the crankshaft 41 is provided in the crankcase 40, and a drive motor 50 is provided in the housing for driving the crankshaft 41 to move during starting. The gasoline engine also includes storage A fuel tank 60 for fuel is mounted on one side of the crankcase 40, the carburetor 20 is also located on one side of the crankcase 40 and above the cylinder 60, and the drive motor 50 is provided on the other side of the crankcase 40. When the drive motor 50 is started, the controller acquires the temperature of the cylinder 30 detected by the temperature detection unit. When the temperature is lower than the preset value, it is determined that the engine belongs to a cold start state, and the steering gear 22 is controlled to start to close the choke door 23, and After the throttle is activated, the choke valve 23 automatically returns to the open state. Of course, if the temperature is higher than the preset value, it is determined that the engine is in the hot start state, the steering gear 22 will not act, and the throttle 24 of the carburetor 20 is closed. Each time the engine starts, the steering gear 22 receives the cylinder temperature signal and makes a judgment. That is, the controller judges the temperature detected by the temperature detection unit according to the start of the drive motor 50, and controls the steering gear 22 to start when the detected temperature is lower than the preset value, and the detected temperature is higher than the preset The servo 22 will not start when it is on duty.

In addition, the gasoline engine further includes an air filter 80 connected to the air inlet, the air filter 80 has an air filter housing 81 connected to the housing 10, an air filter base 82 provided between the air filter housing 81 and the housing 10, and the steering gear 22 And the transmission mechanism is installed on the air filter base 82. The other side of the cylinder 30 relative to the carburetor 20 is also provided with a muffler 70 to reduce the noise generated when the gasoline engine is running.

In the above embodiment, the automatic damper control system of the gasoline engine can automatically make a judgment according to the change of the cylinder temperature and realize the opening or closing of the pre-fuel valve of the carburetor. It can greatly simplify people's operations and facilitate their use.

It should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This description of the specification is for clarity only, and those skilled in the art should treat the specification as a whole, each The technical solutions in the embodiments may also be combined appropriately to form other embodiments that can be understood by those skilled in the art.

The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention, they are not intended to limit the scope of protection of the present invention, and equivalent embodiments or technical equivalents made without departing from the technical spirit of the present invention Changes should be included in the protection scope of the present invention.

Claims

An automatic damper control system for a gasoline engine (100). The gasoline engine includes a carburetor (20) and a cylinder (30) connected to the carburetor. The carburetor is provided with a throttle (24). The carburetor An air intake passage (21) is provided between the cylinder and the air intake passage, and the automatic damper control system includes a choke valve (23), a power unit driving the choke valve, a controller connected to the power unit, and A temperature detection unit connected to the controller, the choke door is used to open or close the air inlet,

It is characterized in that the choke valve is connected to an elastic element (233), the temperature detection unit is used to detect the temperature of the cylinder, and when the detected temperature is lower than a preset temperature, the controller controls the power unit to drive The choke valve rotates in the first direction to close the air inlet, the elastic element stores energy, and the throttle opens in response to the rotation of the choke valve by a first preset angle; the throttle opening increases to not less than At a second preset angle, the elastic release of the elastic element drives the choke valve to open the air inlet.
The automatic damper control system of a gasoline engine according to claim 1, wherein the power unit includes a steering gear and a transmission mechanism driven by the steering gear, the transmission mechanism includes a first spur gear connected to the steering gear ( 221) and a second spur gear (222) meshing with the first spur gear, the second spur gear drives the choke to rotate along the same axis.
The automatic damper control system of a gasoline engine according to claim 2, wherein the transmission mechanism further includes a damper shaft (231) driven by the second spur gear, and the damper valve is connected to the damper shaft The throttle is connected to the throttle shaft (241), and the second spur gear drives the choke to close through the throttle shaft; the throttle shaft drives the throttle shaft to rotate through the driving structure to open the throttle.

A
The automatic throttle control system of a gasoline engine according to claim 3, wherein the driving structure includes a first claw (232) fixedly connected to the throttle shaft and a second claw fixedly connected to the throttle shaft ( 242), the first claw rotates with the throttle shaft to drive the second claw, the second claw drives the throttle shaft to rotate; the gasoline engine starts, the throttle shaft rotates to increase the throttle opening to Not less than a second preset angle, the second preset angle is greater than the first preset angle, the second claw is separated from the first claw under the drive of the throttle shaft, the elastic element acts The first claw drives the damper shaft to cause the choke valve to open the air inlet.
The automatic throttle control system of a gasoline engine according to claim 3, characterized in that a throttle spring (243) is connected to the throttle shaft, the throttle spring provides the throttle shaft to drive the throttle from an open position to a closed position Of elasticity.
An automatic damper control system for a gasoline engine includes a choke valve (23) for opening or closing an air inlet, a power unit driving the choke valve (231), a controller connected to the power unit, and a throttle ( 24), characterized by,

The choke valve is connected to a reset element (233), the controller controls the power unit to drive the choke valve to rotate in the first direction to close the air inlet, the choke valve and the throttle are established under the action of the power unit One-way transmission connection in one direction, the throttle opens at a first preset angle, and the choke valve is restricted from rotating in a second direction opposite to the first direction;

The throttle is opened to not less than a second preset angle, the one-way transmission connection between the choke and the throttle is disconnected, and the reset element drives the choke to rotate in the second direction to open the air inlet.
The automatic damper control system of a gasoline engine according to claim 6, wherein the power unit includes a steering gear, a transmission mechanism driven by the steering gear, and a damper shaft connected to the transmission mechanism, the damper is installed on the damper On the shaft, the transmission mechanism is drivingly connected to the damper shaft along the first direction, and is disconnected from the damper shaft within a preset range along the second direction.
The automatic damper control system of a gasoline engine according to claim 7, wherein the transmission mechanism includes a first spur gear driven by a steering gear and a second spur gear meshed with the first spur gear, the second spur gear The end face of the gear is provided with a limiting groove, and one end of the damper shaft is connected to a transmission member (236). The transmission member is disposed in the limiting groove and can rotate relative to the second spur gear along the limiting groove. The second spur gear rotates in the first direction to drive the damper shaft to rotate through the transmission member; the second spur gear rotates in the second direction within a preset range corresponding to the limit slot, the transmission The member moves relative to the second spur gear in the limit groove.
The automatic throttle control system of a gasoline engine according to claim 6, characterized in that the throttle is connected to a throttle shaft (241), and a driving structure is provided between the choke and the throttle; the choke and the throttle The driving structure is linked and drives the throttle shaft to rotate through the driving structure to open the throttle by a first preset angle.
The automatic throttle control system of a gasoline engine according to claim 9, characterized in that the driving structure includes a first claw (232) fixedly connected to the throttle shaft and a second claw fixedly connected to the throttle shaft (232) 242), the first claw rotates with the throttle shaft to drive the second claw, and the second claw drives the throttle shaft to rotate.
The automatic damper control system of a gasoline engine according to claim 10, wherein the second claw is provided with a self-locking structure that restricts the rotation of the choke valve in the second direction, and the self-locking structure includes a second claw The upper step portion, the first claw abuts on the step portion to drive the second claw, the step portion restricts the first claw to rotate and reset in the second direction, and the throttle shaft drives the first claw The two claws are separated from the first claw, and the first claw is allowed to rotate and reset in the second direction.
A gasoline engine (100) includes a casing (10), a cylinder (30) disposed in the casing, a piston (42) reciprocating in the cylinder, a crankshaft (41) that drives the piston to reciprocate, and a crankshaft drive motion when starting Drive motor (50), fuel tank (60) for storing fuel, and carburetor (20) disposed between the cylinder and the fuel tank, characterized in that the gasoline engine further includes any one of claims 1 to 14. Automatic damper control system.
The gasoline engine according to claim 12, characterized in that the gasoline engine further includes an air filter (80) connected to the air inlet, the air filter includes an air filter housing (81) connected to the housing and provided in the air An air filter base (82) between the filter housing and the housing, the steering gear and the transmission mechanism are installed on the air filter base.
The gasoline engine according to claim 12, wherein the controller judges the temperature detected by the temperature detection unit according to the start of the drive motor, and controls the temperature when the detected temperature is lower than a preset value The steering gear starts.
An automatic damper control method for a gasoline engine (100), characterized in that it includes the following steps:

Get the temperature of the cylinder;

When the temperature of the cylinder is less than the preset temperature, the controller sends a drive signal to the power unit, the drive signal is a signal that controls the power unit to drive the choke valve to rotate the preset angle in the first direction and reset the power unit. The air inlet is closed under the action, and the throttle opens the first preset angle under the action of the one-way transmission connection of the choke valve;

Control the throttle to open a second preset angle, the second preset angle is greater than the first preset angle, the throttle and the choke valve are disconnected from the one-way transmission, and the choke valve is reset to open the air inlet.
The automatic damper control method of a gasoline engine according to claim 15, wherein the controller obtains the temperature of the cylinder based on the start of the engine.