CN114278443A - Electric injection throttle body - Google Patents

Abstract

The invention discloses an electronic fuel injection throttle body, comprising a main body (1), a control system is arranged on the main body (1), a motor (2) is fixed on the lower end of the main body (1), and the motor ( 2) A throttle shaft actuating mechanism (3) is arranged between the output end and the control system, the throttle shaft actuating mechanism (3) is located in the body (1), and a An injector mechanism (4); the control system includes a casing (7) fixed on the body (1), a PCB board (8) is fixed in the casing (7), and the PCB board (8) is powered on A bus slot (9), a temperature sensor (10), a pressure sensor (11), a throttle opening position sensor (12), a circuit socket and a processing chip are connected; the invention has higher versatility and stronger applicability. advantage.

Description

An EFI throttle body

technical field

The invention relates to the field of engines, in particular to an electronic fuel injection throttle body.

Background technique

The EFI throttle body is an important part in the electronic fuel injection system of a gasoline engine and is installed on the intake manifold of the engine. Its main function is to control various working conditions of the engine by controlling the air flow drawn into the engine. The EFI throttle body includes a throttle main channel and an idle air bypass channel that control the intake air volume. The throttle position sensor is installed on the throttle shaft to detect the throttle opening; the idle air control valve is installed on the idle air bypass channel. When the engine is running at idle speed and the throttle is fully closed, the idle air control valve is pressed Commands from the engine control unit automatically regulate the flow of air drawn into the engine. With the increasing requirements for energy saving, emission reduction, economical and practical, small and lightweight, and generalization of general-purpose engines at home and abroad, the application of EFI systems on most general-purpose engines in China is still relatively low. On the electromechanical injection system, there are also shortcomings such as low versatility.

In patent CN201710329934.3, an EFI throttle valve is disclosed, which includes a body, a throttle shaft, an ECU board and a motor mounted on the body, the ECU board is arranged in the accommodating chamber of the body, An intake air temperature sensor is installed at the intake end of the throat pipe of the main body, the intake air temperature sensor is connected with the ECU board, the throttle valve shaft passes through the throat pipe, and the lower end of the throttle valve shaft is provided with an intake air temperature sensor. A magnet rocker arm, a Hall sensor is provided on the ECU board, the chip sensing center of the Hall sensor is coaxial with the magnet of the magnet rocker arm and has a gap, and an annular groove is also provided on the ECU board , a motor rocker arm is connected to the shaft of the motor, and the magnet rocker arm is connected to the motor rocker arm through the annular groove, but the opening adjustment in the EFI throttle valve is not suitable for general-purpose engines.

In patent CN201320443296.5, an EFI throttle body is disclosed, which comprises a body (5), a throttle shaft (6), a throttle plate (7), a rotating frame assembly (1), a body (5), and a valve body (5). ) and a stepping motor (10) connected to the other end of the throttle shaft (6), a torsion spring (3) arranged between the main body (5) and the rotating frame assembly (1), and a torsion spring (3) arranged on the main body (5) The limit screw (2) also includes a shaft sleeve (4), the shaft sleeve (4) is arranged on the throttle shaft (6) between the main body (5) and the rotating frame assembly (1), and the torsion spring (3) The torsion spring (3) is a double torsion spring, one end of the torsion spring (3) is fixed on the body (5), and the other end of the torsion spring (3) is fixed on the rotating frame assembly (1) The bottom surface of the main body (5) is provided with an intake manifold connection surface (11). The advantages of the invention are: the torsion spring has high working reliability; the accurate return of the throttle plate is ensured, but the invention is not suitable for general-purpose engines.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide an EFI throttle body, which meets the reliability requirements of a general-purpose engine EFI system, reduces emissions, has higher versatility, and is more applicable. .

The purpose of this invention is to realize through the following technical solutions:

An electronic fuel injection throttle body, comprising:

Main body 1, a control system is arranged on the main body 1, a motor 2 is fixed on the lower end of the main body 1, and a throttle shaft actuating mechanism 3 is arranged between the output end of the motor 2 and the control system. The valve shaft actuating mechanism 3 is located in the main body 1, and an injector mechanism 4 is also arranged outside the main body 1; the control system includes a casing 7 fixed on the main body 1, and a PCB board 8 is fixed in the casing 7, The PCB board 8 is electrically connected with a bus slot 9, a temperature sensor 10, a pressure sensor 11, a throttle opening position sensor 12, a circuit socket and a processing chip; the casing 7 is made of resin, and the casing 7 and the PCB board 8 are encapsulated by epoxy resin glue, the casing 7 is provided with a pressure-taking hole, and the pressure sensor 11 corresponds to the pressure-taking hole.

Further, the throttle shaft actuating mechanism 3 includes an adjustment component, a linkage component and a throttle plate opening component, and the output end of the motor 2 is connected to the throttle plate opening component through a linkage mechanism; the joint The valve plate opening degree assembly includes a throttle valve shaft 5 fixed on the linkage mechanism, a throttle valve plate 6 is movably arranged in the middle of the throttle valve shaft 5, and a through hole is opened on the body 1, and the throttle valve plate 6 is located in the In the middle of the through hole, the throttle plate 6 is used to control whether the two ends of the through hole are connected.

Further, a magnetic cylinder is embedded in the bottom of the casing, the upper end of the throttle shaft is inserted into the magnetic cylinder, and an induction magnetic core is wrapped at the end of the magnetic cylinder.

Further, an annular snap groove is formed on the outer side of the upper end of the throttle shaft, a D-shaped limit groove is arranged in the magnetic cylinder, and the inner wall of the D-shaped limit groove has several inwardly protruding ribs, so The annular clamping groove is adapted to the rib, the upper end face of the throttle shaft is formed with a D-shaped cutout, and the D-shaped cutout is adapted to the D-shaped limiting groove.

Further, a bottom case is fixed on the lower end of the main body, the bottom case forms an inner cavity, the inner cavity and the cavity in the main body form a accommodating cavity, and the motor and the throttle shaft actuating mechanism are located in the accommodating cavity. Inside.

Further, the linkage assembly includes a throttle shaft suspension fixed on the motor output shaft, a motor rocker arm is fixedly installed on the throttle shaft suspension, and a reset torsion spring is fixed on the motor rocker arm, so The throttle shaft is located in the return torsion spring, and the throttle shaft suspension is provided with a block extending upward, and the block is adapted to the output end of the adjustment assembly.

Further, the adjustment assembly includes an adjustment screw disposed through the body, the adjustment screw is sleeved with a spring, and the extension end of the adjustment screw is in contact with the end surface of the block.

Further, the fuel injector mechanism includes a fuel injection nozzle, a sealing ring, an electric control plug and a high-pressure fuel input quick connector, and the fuel injector mechanism is installed on the outside of the body.

Further, a rectangular groove is formed in the middle of the throttle shaft, the throttle plate is placed in the rectangular groove and fixed by a flat head screw, and the outer wall of the throttle shaft is also provided with two opposite let-downs. A slot, the rectangular slot is located between the two give way slots.

Beneficial effects of the present invention:

The electronic fuel injection throttle body proposed by the present invention forms the modularization of the control system by integrating the temperature sensor, the pressure sensor and the throttle valve opening position sensor into one, so that it has wider adaptability and flexibility. Universality; the EFI throttle body controls the rotation angle of the motor, and then adjusts the opening of the throttle shaft through the transmission assembly between the motor and the throttle shaft actuating mechanism, and the signal of the opening change is transmitted to the control through the opening position sensor. In the system, the fuel injection volume of the injector mechanism is adjusted to match the intake air volume of the corresponding opening, so as to ensure the economy of fuel supply; the EFI throttle body reduces emissions, and its versatility is higher. Compared with the existing domestic professional technology in the same field, the invention not only satisfies the general energy saving and emission reduction effect of the general electric injection system, but also has a compact layout, small size and light weight, and modularization of the sub-system, and can adapt to various small General-purpose engine applications, such as lawn mowers, small generators, sports ATVs, and a large number of civilian general-purpose generators, and are more adaptable to external harsh working conditions, such as temperature, humidity, dust, etc.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the sectional view of the present invention;

Fig. 3 is the internal structure diagram of the control system;

Figure 4 is a schematic structural diagram of a throttle shaft actuating mechanism;

Figure 5 is a side view of the throttle shaft;

Figure 6 is a top view of the throttle shaft;

FIG. 7 is a schematic view of the structure of the magnetic cylinder.

In the figure, the main body 1, the motor 2, the throttle shaft actuating mechanism 3, the fuel injector mechanism 4, the throttle shaft 5, the annular slot 51, the rectangular slot 52, the giving way slot 53, the throttle plate 6, the casing 7, PCB board 8, bus slot 9, temperature sensor 10, pressure sensor 11, throttle opening position sensor 12, magnetic cylinder 13, ribs 131, induction magnetic core 14, bottom case 15, throttle shaft suspension 16, motor Rocker arm 17 , return torsion spring 18 , adjusting screw 19 .

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations. Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In this embodiment, as shown in FIGS. 1 to 7 , an EFI throttle body includes a main body 1 , a control system is arranged on the main body 1 , a motor 2 is fixed on the lower end of the main body 1 , and the motor A throttle shaft actuating mechanism 3 is arranged between the output end of 2 and the control system, the throttle shaft actuating mechanism 3 is located in the body 1, and an injector mechanism 4 is also provided outside the body 1; the control The system includes a housing 7 fixed on the body 1, a PCB board 8 is fixed in the housing 7, and a bus slot 9, a temperature sensor 10, a pressure sensor 11, and a throttle opening position sensor are electrically connected to the PCB board 8. 12. Circuit socket and processing chip; the housing 7 is made of resin, the housing 7 and the PCB board 8 are encapsulated by epoxy resin, and the housing 7 is provided with a pressure hole, and the pressure sensor 11 corresponds to the pressure taking hole.

An intake air temperature sensor is installed at the intake end of the throat of the main body 1, and its processing chip is installed on the PCB board 8. The engine connection end of the main body 1 is provided with an intake pressure sensor sensing port, and the sensing port is connected to the The pressure sensor processing chip is mounted on the PCB board 8 .

Through the setting of this embodiment, the processing chip can be more effectively protected, and the impact of the external signal eroded by water, oil and dust in harsh working conditions can be avoided on the chip; the casing 7 is provided with drainage holes for draining water. The water and oil condensed into the water vapor and oil mist from the external environment entering the casing 7 are removed, and the water and oil are prevented from entering the throat hole and affecting the purity of the intake air.

In this embodiment, the temperature, pressure and position sensors are integrated in the casing 7 in a three-in-one manner, and a modular whole is formed by potting and sealing, which can not only effectively isolate the influence of the external environment on the processing chip in the casing 7, but also improve the The general adaptability and interchangeability of the control system, the temperature sensor 10, the pressure sensor 11, and the throttle opening position sensor 12 are integrated into one, forming the modularization of the control system, making it have a wider range of adaptability. Compatibility and versatility; the PCB board 8 in the casing 7 is provided with a Hall-type throttle opening position sensor (TPS) 12, and the center of the induction chip of the Hall-type throttle opening position sensor 12 is connected to the magnetic The cylinder 13 has a certain clearance.

A rubber sealing ring is provided at the pressure-taking hole position corresponding to the pressure sensor 11, and a temperature sensor probe hole corresponding to the temperature sensor 10 is also opened on the housing 7, and the position of the temperature sensor probe hole is also provided with a rubber sealing ring, so that the Avoid water and oil in the working environment from entering the housing through the pressure taking hole and the temperature sensor probe hole.

The present invention is further provided as follows: the throttle shaft actuating mechanism 3 includes an adjustment component, a linkage component and a throttle plate opening component, and the output end of the motor 2 is connected to the throttle plate opening component through a linkage mechanism; The throttle plate opening component includes a throttle shaft 5 fixed on the linkage mechanism, a throttle plate 6 is movably arranged in the middle of the throttle shaft 5, and a through hole is opened on the body 1, and the throttle The plate 6 is located in the middle of the through hole, and the throttle plate 6 is used to control whether the two ends of the through hole are connected.

The body 1 has two downwardly extending uprights, the lower ends of the two uprights are fixed with mounting pieces, and the motor 2 is fixed to the lower side of the mounting pieces by bolts;

The present invention is further configured as follows: a magnetic cylinder 13 is embedded in the bottom of the casing 7 , the upper end of the throttle shaft 5 is inserted into the magnetic cylinder 13 , and the end of the magnetic cylinder 13 is wrapped with an induction magnetic core 14 .

In this embodiment, the induction magnetic core of the throttle shaft 5 opening position sensor is integrated into the throttle shaft actuating mechanism, so that the motor 2, the throttle shaft actuating mechanism and the magnetic induction of the opening position achieve functional integration and layout integration , which can not only meet the basic transmission function, but also make the layout compact and modular, and enhance the interchangeability and adaptability of similar designs; the magnetic cylinder 13 is a circular resin magnetic cylinder.

The present invention is further provided as follows: the outer side of the upper end of the throttle shaft 5 is provided with an annular snap groove 51, the magnetic cylinder 13 is provided with a D-shaped limit groove, and the inner wall of the D-shaped limit groove has several sections that protrude inwards. The rib 131 is raised, the annular groove 51 is adapted to the rib 131, the upper end face of the throttle shaft 5 is formed with a D-shaped cutout, and the D-shaped cutout is adapted to the D-shaped limit groove.

In this embodiment, the magnetic cylinder 13 is matched with the annular groove 51 and the D-shaped cutout on the throttle shaft 5 through the rib 131 and the D-shaped limit groove. On the joint surface of the assembly, there are annular elongated ribs 131 to reduce the matching error and make the transmission more flexible.

The present invention is further provided as follows: a bottom case 15 is fixed on the lower end of the main body 1, the bottom case 15 forms an inner cavity, the inner cavity and the cavity in the main body 1 form a accommodating cavity, the motor 2 and the throttle valve The shaft actuating mechanism 3 is located in the accommodating cavity.

The present invention is further provided as follows: the linkage assembly includes a throttle shaft suspension 16 fixed on the output shaft of the motor 2, a motor rocker arm 17 is fixedly mounted on the throttle shaft suspension 16, and the motor rocker arm 17 A reset torsion spring 18 is fixed on it, the throttle shaft 5 is located in the reset torsion spring 18, and the throttle shaft suspension 16 has an upwardly extending block, and the block is adapted to the output end of the adjustment assembly .

In this embodiment, the throttle shaft suspension 16 is provided with a motor rocker arm 17, and the transmission rocker arm 17 is provided with a square slot that matches the output shaft of the motor 2; the motor 2 passes through the motor rocker arm 17 and the throttle valve. The shaft suspension 16 transmits the rotation action to the throttle shaft 5 to control the opening angle of the throttle plate 6; the lower end of the return torsion spring 18 is fixed on the motor rocker arm 17, and the upper end of the return torsion spring 18 The side end is fixed in the body 1 .

A return spring and a stop pin are also arranged between the motor rocker arm 17 and the throttle shaft suspension 16, so as to eliminate the rotation error caused by the slight vibration in the transmission process and effectively ensure the stability of the transmission.

The present invention further provides that: the adjustment assembly includes an adjustment screw 19 disposed through the main body 1, a spring 20 is sleeved on the adjustment screw 19, and the extension end of the adjustment screw 19 abuts against the end surface of the block.

By setting the adjustment screw 19, the initial opening degree of the throttle plate 6 can be adjusted.

The present invention is further provided that: the injector mechanism 4 includes a fuel injector, a sealing ring, an electric control plug and a high-pressure fuel input quick-connect joint, and the injector mechanism 4 is installed outside the body 1 .

The electrical signal processing units of the motor 2 and the fuel injector mechanism are all arranged on the PCB board 8 .

The present invention is further provided as follows: a rectangular groove 52 is formed in the middle of the throttle shaft 5, the throttle plate 6 is placed in the rectangular groove 52 and fixed by a flat head screw, and the outer wall of the throttle shaft 5 is also There are two opposite escaping slots 53 , and the rectangular slot 52 is located between the two escaping slots 53 .

The working principle of the present invention:

When the engine is working, the control system automatically processes the signals from the intake pressure sensor 11 and the temperature sensor 10 according to the change of the engine load, controls the rotation angle of the motor 2, and then passes the transmission between the motor 2 and the throttle shaft actuating mechanism. components to adjust the opening of the throttle shaft 5, the signal of the change of the opening is transmitted to the control system through the opening position sensor 12, and then adjusts the fuel injection amount of the injector mechanism 4 to match the intake air volume of the corresponding opening. , to ensure the economy of fuel supply; the rotation of the output shaft of the motor 2 drives the rotation of the motor rocker arm 17, and the rotation is simultaneously transmitted to the throttle shaft suspension 16 to drive the throttle shaft 5 to rotate accordingly to adjust the throttle plate 6 of opening.

In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. are based on those shown in the accompanying drawings. The orientation or positional relationship, or the orientation or positional relationship that the product of the invention is usually placed in use, or the orientation or positional relationship that is commonly understood by those skilled in the art, are only for the convenience of describing the present invention and simplifying the description, rather than indicating or It is implied that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first", "second", etc. are only used to differentiate the description and should not be construed to indicate or imply relative importance. In the description of the present invention, it should also be noted that, unless otherwise expressly specified and limited, terms such as "arrangement" and "connection" should be understood in a broad sense, for example, "connection" may be a fixed connection or Detachable connection, or integral connection; may be mechanical connection or electrical connection; may be direct connection or indirect connection through an intermediate medium, and may be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

Claims (9)

1. an electronic fuel injection throttle body, is characterized in that, comprises: A main body (1), a control system is arranged on the main body (1), a motor (2) is fixed on the lower end of the main body (1), and a joint is arranged between the output end of the motor (2) and the control system A valve shaft actuating mechanism (3), the throttle shaft actuating mechanism (3) is located in a main body (1), and an injector mechanism (4) is also provided outside the main body (1); the control system includes A casing (7) fixed on the body (1), a PCB board (8) is fixed in the casing (7), and a bus slot (9), a temperature sensor (10) are electrically connected to the PCB board (8) ), a pressure sensor (11), a throttle opening position sensor (12), a circuit socket and a processing chip; the casing (7) is made of resin, and the casing (7) and the PCB board (8) pass through Epoxy resin potting and encapsulation, the casing (7) is provided with a pressure-taking hole, and the pressure sensor (11) corresponds to the pressure-taking hole. 2 . The EFI throttle body according to claim 1 , wherein the throttle shaft actuating mechanism ( 3 ) comprises an adjustment component, a linkage component and a throttle plate opening component, and the motor The output end of (2) is connected with the throttle plate opening degree assembly through a linkage mechanism; the throttle plate opening degree assembly includes a throttle valve shaft (5) fixed on the linkage mechanism, and the throttle valve shaft (5) A throttle plate (6) is movably arranged in the middle, a through hole is opened on the body (1), the throttle plate (6) is located in the middle of the through hole, and the throttle plate (6) is used to control the through hole Whether the two ends are connected. 3 . The EFI throttle body according to claim 1 , wherein a magnetic cylinder ( 13 ) is embedded in the bottom of the casing ( 7 ), and the upper end of the throttle shaft ( 5 ) is inserted It is arranged in the magnetic cylinder (13), and the end of the magnetic cylinder (13) is wrapped with an induction magnetic core (14). 4 . The EFI throttle body according to claim 3 , characterized in that: the outer side of the upper end of the throttle shaft ( 5 ) is provided with an annular groove ( 51 ), and the magnetic cylinder ( 13 ) is provided with an annular groove ( 51 ). There is a D-shaped limit groove, the inner wall of the D-shaped limit groove has several inwardly protruding ribs (131), the annular clamping groove (51) is adapted to the ribs (131), the throttle valve A D-shaped notch is formed on the upper end face of the shaft (5), and the D-shaped notch is adapted to the D-shaped limiting groove. 5 . The EFI throttle body according to claim 1 , wherein a bottom case ( 15 ) is fixed on the lower end of the main body ( 1 ), and the bottom case ( 15 ) forms an inner cavity, and the The inner cavity and the cavity in the body (1) form a accommodating cavity, and the motor (2) and the throttle shaft actuating mechanism (3) are located in the accommodating cavity. 6 . The EFI throttle body according to claim 2 , wherein the linkage assembly comprises a throttle shaft suspension ( 16 ) fixed on the output shaft of the motor ( 2 ), and the throttle valve A motor rocker arm (17) is fixedly installed on the shaft suspension (16), a reset torsion spring (18) is fixed on the motor rocker arm (17), and the throttle shaft (5) is located at the reset torsion spring (18) Inside, the throttle shaft suspension (16) is provided with an upwardly extending block, and the block is adapted to the output end of the adjustment assembly. 7 . The EFI throttle body according to claim 2 , wherein the adjusting assembly comprises an adjusting screw ( 19 ) arranged through the body ( 1 ), and the adjusting screw ( 19 ) is sleeved on the adjusting screw ( 19 ). 8 . There is a spring (20), and the extension end of the adjusting screw (19) is in abutment with the end face of the block. 8 . The electronic fuel injection throttle body according to claim 1 , wherein the fuel injector mechanism ( 4 ) comprises a fuel injection nozzle, a sealing ring, an electronic control plug and a high-pressure fuel input quick-connect joint, and the injection The oiler mechanism (4) is installed on the outside of the main body (1). 9 . The EFI throttle body according to claim 2 , wherein a rectangular groove ( 52 ) is formed in the middle of the throttle shaft ( 5 ), and the throttle plate ( 6 ) is placed on the In the rectangular groove (52) and fixed by the flat head screw, the outer wall of the throttle shaft (5) is also provided with two opposite let-away grooves (53), the rectangular groove (52) is located in the two let-away spaces between slots (53).

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