WO2007036133A1

WO2007036133A1 - A throttle module for a minitype engine

Info

Publication number: WO2007036133A1
Application number: PCT/CN2006/002340
Authority: WO
Inventors: Huiqiang Li; Xiang Wu
Original assignee: United Automotive Electronic Systems Co., Ltd
Priority date: 2005-09-28
Filing date: 2006-09-11
Publication date: 2007-04-05
Also published as: CN100365261C; CN1786446A

Abstract

A throttle module for a minitype engine includes a case in which a stepmotor(6), a ceramic base plate(7) for a throttle position sensor and a PCB(4) are provided; a rotor(3) of the throttle position sensor is provided between the ceramic base plate(7) for a throttle position sensor and the PCB(4) and is connected with a shaft of the throttle; an intake pressure sensor(8) is stuck in the back of the ceramic base plate(7) for the throttle position sensor; a sensing hole is provided in the lower part of the intake pressure sensor(8); the intake temperature sensor(5) is electrically connected therewith in the back of the PCB(4), the ceramic base plate(7) for the throttle position sensor and the intake pressure sensor(8) are electrically connected with the PCB(4) by the jumper, the stepmotor(6) is electrically connected with the PCB(4); an input-output interface is provided at an external end of the case(10) which is connected with the throttle assembly(11).

Description

Small engine throttle module

Technical field

The present invention relates to an air intake control device for an internal combustion engine, and more particularly to a small engine throttle valve module suitable for use in a motorcycle or a small displacement vehicle.

Background technique

At present, the engine throttle of the vehicle is generally controlled by electronic intelligent control and manual control. The electronic intelligent control intelligently controls the opening degree of the throttle according to the driver's input command and the vehicle/road condition information collected by the on-board sensor, so that the engine speed and output torque are optimized, and the combustion and discharge effects are the best. The manual control is to connect the accelerator pedal of the vehicle with the valve piece of the engine throttle body through the transmission mechanism, and the driver adjusts the throttle opening degree by stepping on the accelerator pedal. The manual control of the throttle is difficult to achieve precise control due to the subjective judgment of the driver. At present, cars and motorcycles in the form of carburetor are mostly controlled manually. With the increasingly strict national emission regulations, they often fail to meet emission requirements. In automobiles, especially in cars, electronic fuel injection devices are used. The valves are all electronically controlled.

The existing electronic intelligent control throttle includes a throttle valve plate, a throttle shaft, a casing and an air passage. The throttle valve plate is fixed on the throttle shaft and can rotate in the air passage, and the throttle shaft is connected to the stepping motor shaft, and The stepping motor is driven to rotate. Position sensors, stepping motors and temperature sensors (pressure sensors are installed in other parts of the engine) are mounted at different positions on the outer end faces of the throttle body. The disadvantages of this type of throttle are: large size, low integration, and very irregular geometry; position sensors, stepper motors and temperature sensors are set in the solar terms The outer side of the door body housing requires a separate housing seal protection, and electrical connection is made with an electronic control unit (ECU) using separate connectors, which increases the manufacturing and use costs and increases the probability of failure. Installation Also more cumbersome. Therefore, this throttle module is difficult to apply directly to motorcycles or small displacement vehicles.

The Chinese invention patent application publication specification CN1587667A (Publication Date: March 2, 2005) discloses an electronic throttle body for a motorcycle. An electronic control unit housing is connected to the outer side of the inlet wall of the electronic throttle body to fix the circuit board in the housing, and the positions of the temperature sensor, the position sensor, the pressure sensing element and other components are adjusted, but The installation position is still large, and the compatibility with the motorcycle engine is poor.

Summary of the invention

The technical problem to be solved by the present invention is to provide a small engine throttle module which is compact in structure, small in size, low in cost, and good in compatibility.

In order to solve the above technical problem, the small engine throttle module of the present invention comprises a casing, one side of the casing is provided with a stepping motor; and the left end of the other side opposite to the stepping motor is provided with a throttle position sensor ceramic substrate. a right side end is provided with a PCB board; a throttle position sensor rotor is disposed between the throttle position sensor ceramic substrate and the PCB board, and is connected with the throttle shaft; the intake pressure sensor patch is on the back side of the throttle position sensor ceramic substrate; A detection hole is arranged under the intake pressure sensor, and the detection hole is connected with the throttle air passage; the back surface of the PCB board is provided with an intake air temperature sensor electrically connected thereto, and the throttle position sensor ceramic substrate and the intake pressure sensor pass the jump The circuit is electrically connected to the PCB board, and the stepping motor is electrically connected to the PCB board; the outer end of the housing corresponding to the PCB board is provided with an input/output interface, and the interface is electrically connected to the PCB board; The throttle body assembly is connected. A small engine throttle module includes a casing, a left side end of the casing is provided with a throttle position sensor ceramic substrate, and a right end of the casing is provided with a PCB board; a throttle position sensor rotor is disposed at the throttle position sensor ceramic substrate and Between the PCB boards, and directly connected to the throttle shaft; the intake pressure sensor patch is on the back side of the throttle position sensor ceramic substrate; the detection pressure hole is provided below the intake pressure sensor, and the detection hole is connected with the throttle air passage The back side of the PCB board is provided with an intake air temperature sensor electrically connected thereto, the throttle position sensor ceramic substrate and the intake pressure sensor are electrically connected through the jumper and the PCB board; the outer side of the housing corresponding to the PCB board An input/output interface is provided, and the interface is electrically connected to the PCB board; the housing is connected to the throttle body assembly.

Due to the above structure, the small engine throttle module of the present invention integrates the intake air temperature sensor, the intake pressure sensor, the throttle position sensor and the stepping motor in one housing, and realizes input and output of control signals through an input/output interface. The housing is then coupled to the throttle body assembly, thereby making the structure more compact, effectively reducing the size of the module, and is highly suitable for use in straddle type motorcycles, scooter type motorcycles, and small displacement vehicles. Since a unified input/output interface is used to realize the connection of the control signals, the connection interface is reduced, and the use and maintenance of the connection are more convenient for the user; and the reduction of the connection interface reduces the probability of failure due to the connection failure of the connection interface. The intake air temperature sensor, intake air pressure sensor, and throttle position sensor no longer require a separate enclosure for protection, and manufacturing costs can be effectively reduced.

The small engine throttle module of the invention can also be provided with a flange type connection interface and a hose type connection interface connected with the subsequent intake manifold on the throttle body assembly, which has strong compatibility. The small engine throttle module of the invention realizes intelligent control of engine throttle and fuel injection by monitoring intake air temperature and pressure parameters and throttle opening position parameters.

BRIEF abstract

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be further described in detail with reference to the accompanying drawings and embodiments. FIG. 1 is a schematic exploded view of the small engine throttle module of the present invention;

Figure 2 is a schematic view showing the internal structure of the housing of Figure 1 after the cover is removed;

3 is a schematic view of the small engine throttle valve cover and the housing assembly of the present invention connected by a clip;

4 is a schematic view of a flanged connection interface of a small engine throttle module of the present invention for a straddle type motorcycle.

Embodiments of the invention

As shown in FIG. 1, the small engine throttle module of the present invention comprises a throttle body assembly 11 and an intake air temperature sensor 5, an intake pressure sensor 8, a throttle position sensor, a step motor 6 and a PCB board disposed in the housing. 4 composition. The body of the throttle body assembly 11 is made of cast aluminum material (other parts of the throttle body assembly 11 are made of stainless steel or other materials), and the housing is made of high-strength plastic, the throttle body assembly 11 and the shell. Sealing rings are provided between the bodies, and then they are fixedly connected by screws. This reduces the weight of the entire module and reduces manufacturing costs.

As shown in FIG. 3, the housing is square and includes a housing assembly 10 and a cover plate 1. Each of the outer side walls of the casing assembly 10 is provided with a locking protrusion 20, and the clip 2 is engaged between the cover plate 1 and the engaging protrusion 20, and the housing assembly 10 is fixedly connected with the cover plate 1. Together, this makes it easy to disassemble and maintain. The end face of the side wall of the housing assembly 10 is provided with a recess 16 in which a sealing ring 9 is embedded. The peripheral side of the cover plate 1 extends downward to form a rim 17 which is surrounded by the rim 1 Fits the shape of the housing assembly 10 to enclose the housing assembly 10. Thus, when the cover plate 1 is fixedly coupled to the housing assembly 10, the formed sealing structure can effectively prevent oil, water or other dirt from entering the interior of the housing. Especially when washing the car, it can effectively prevent the high-pressure water sprayed from the high-pressure water gun from entering the housing, causing damage to the internal sensor and the circuit board, affecting its reliability. At the same time, the sealing method has good maintenance performance and is convenient to disassemble.

Referring to Figures 1 and 2, a stepping motor 6 is disposed on one side of the housing assembly 10, and a throttle position sensor ceramic substrate 7 is disposed at a left end of the other side opposite to the stepping motor 6, and the right end thereof is provided. There is a PCB board 4, and a throttle position sensor rotor 3 is disposed between the throttle position sensor ceramic substrate 7 and the PCB board 4, and is directly connected to the throttle shaft.

The intake pressure sensor 8 is attached to the back surface of the throttle position sensor ceramic substrate 7, and the other end surface of the intake pressure sensor 8 is in close contact with the bottom end surface of the housing assembly 10, and the bottom of the housing assembly 10 corresponding thereto The end surface is provided with a detecting hole which communicates with the throttle air passage. The detection hole below the intake pressure sensor may also be in communication with a pressure sampling hole provided on the throttle body assembly 11 for collecting pressure of other parts of the small displacement vehicle.

The back surface of the PCB board 4 is provided with an intake air temperature sensor 5 electrically connected thereto. A mounting hole is provided in the housing assembly 10, and the thermistor of the intake air temperature sensor 5 is installed in the hole and the throttle air passage. The throttle position sensor ceramic substrate 7 and the intake pressure sensor 8 are electrically connected by a jumper and a PCB board, and the stepping motor 6 is electrically connected to the PCB board 4. The stepping motor 6 can also be electrically connected to the PCB 4 via the anti-vibration connector 12. The connector port 18 of the anti-vibration connector 12 and the anti-vibration connector body 19 are inclined at an obtuse angle to form a connector with an oblique connector. The angle of inclination is 120 ° ~ 150 °. This can reduce the installation space and make the interchangeable wiring of the stepper motor easier. The outer end of the housing assembly 10 corresponding to the PCB board 4 is directly formed into a 12-pin standard male socket by means of overmolding, as an input/output interface 21, the interface 21 and the PCB board 4 electrical connection. The user can easily connect with the client through a standard female end, and the interface is very simple and convenient.

In another embodiment of the present invention, another embodiment may be employed in which the stepping motor 6 in the housing assembly 10 is eliminated in the small engine throttle module described above, and the other structure is unchanged. Because customers in some countries require a stepper motor 6 for cost or other considerations. In fact, the function of the stepping motor 6 is mainly when the main air passage is in the closed state, that is, the driver can still be in the working state when the driver does not step on the accelerator, or when the driver needs to use the car key to start the vehicle instead of By stepping on the throttle, the ECU can open the throttle air passage by controlling the stepping motor so that the engine has enough air to start. When the stepper motor is removed, when the engine is at idle or when a cold start is required, the engine can be controlled by some valves associated with the engine. Of course, the performance of such a car may be less accurate than that of an electric spray system that uses a stepper motor to control bypass, and is also inferior in performance. However, there is a certain reduction in cost.

Existing throttle position sensors typically include three sections: a housing, a rotor, and a ceramic substrate. In order to achieve the purpose of reducing the volume of the throttle module, the present invention cancels the outer casing of the throttle position sensor, and the throttle position sensor ceramic substrate 7 is directly fixed in the housing assembly 10 by glue or screw, and the throttle position sensor rotor 3 is The throttle shafts are secured together by locking screws or laser welding. Also, the intake pressure sensor 8 and the intake air temperature sensor 5 are not separately provided with the outer casing.

As shown in FIG. 4, the throttle body assembly 10 is provided to be connected to a subsequent intake manifold 26. The interface 14 has an axial direction parallel to the housing side end where the input/output interface 21 is located. The interface 14 connected to the subsequent intake manifold 26 is provided with a connecting flange 22 forming a flanged connection interface for a straddle type motorcycle. The interface 14 connected to the subsequent intake manifold 26 is further provided with a recess 23 to form a rubber hose connection interface for the scooter type motorcycle. Therefore, the small engine throttle module of the present invention is used in an existing motorcycle, and when the carburetor used on the motorcycle is replaced, the two connection modes can be completely covered, and there is no need to replace other parts, and the compatibility is strong.

An electronic control unit (ECU) may be disposed on the PCB 4. The small engine throttle module of the present invention transmits the intake air parameters and the opening angle of the throttle valve through the sensor to the ECU chip mounted on the PCB 4, and the ECU controls the corresponding fuel injection system. The ECU also controls the air flow during idle and cold start by an actuator, stepper motor 6.

The small engine throttle valve module of the invention has the characteristics of high integration, compact structure, small volume, low cost and good compatibility, and can be directly applied to a motorcycle to replace a carburetor, and can be used for a small displacement automobile.

Industrial applicability

The small engine throttle module of the invention integrates an intake air temperature sensor, an intake pressure sensor, a throttle position sensor and a stepping motor in one housing, and adopts a unified input and output interface to realize connection of control signals, so that the structure is more Compact and small, it is ideal for straddle-type motorcycles, scooter-type motorcycles and small-displacement vehicles. And there is no need to replace other parts, and it has strong compatibility.

The shell is made of high-strength plastic and sealed structure. It can effectively prevent oil, water or other dirt from entering the interior of the casing. It has high reliability, light weight and low cost.

Claims

Rights request

A small engine throttle module, comprising: a housing, one side of the housing is provided with a stepping motor; and the left end of the other side opposite to the stepping motor is provided with a throttle position sensor ceramic substrate a right side end is provided with a PCB board; a throttle position sensor rotor is disposed between the throttle position sensor ceramic substrate and the PCB board, and is connected with the throttle shaft; the intake pressure sensor patch is on the back side of the throttle position sensor ceramic substrate; A detection hole is arranged under the intake pressure sensor, and the detection hole is connected with the throttle air passage; the back surface of the PCB board is provided with an intake air temperature sensor electrically connected thereto, and the throttle position sensor ceramic substrate and the intake pressure sensor pass the jump The circuit is electrically connected to the PCB board, and the stepping motor is electrically connected to the PCB board; the outer end of the housing corresponding to the PCB board is provided with an input/output interface, and the interface is electrically connected to the PCB board. Connected to the throttle body assembly.

2. The small engine throttle module according to claim 1, wherein: the housing is composed of a housing assembly and a cover plate, and the joint of the housing assembly and the cover plate is provided with a groove and a groove. A sealing ring is embedded therein, and a surrounding side of the cover plate extends downward to form a surrounding edge, and the surrounding edge is adapted to the shape of the housing assembly and covers the housing assembly; the housing assembly and the cover plate are fixedly connected by the clip .

3. The small engine throttle module according to claim 2, wherein: a bracket projection is disposed on each of the four sides of the housing assembly, and the clip is engaged between the cover and the engaging projection. .

4. The small-sized engine throttle module according to claim 1, wherein: the stepping motor is electrically connected to the PCB board through an anti-vibration connector, and the plug-in port and the anti-vibration connector of the anti-vibration connector The body is tilted between 120° and 150°.

5. A small engine throttle module according to any one of claims 1 to 4. The utility model is characterized in that: the throttle body assembly is provided with an interface connected with a subsequent intake manifold, the axial direction of the interface is parallel to the side end of the housing where the input and output interface is located, and the subsequent intake air The interface connecting the manifolds is provided with a connecting flange to form a flange type connection interface for the straddle type motorcycle; the interface connected with the subsequent intake manifold is further provided with a groove for forming Rubber hose connection for scooter type motorcycles.

6. The small engine throttle module according to claim 1, wherein: the throttle position sensor ceramic substrate is glued or screwed in the housing.

7. The small engine throttle module of claim 1 wherein: said throttle position sensor rotor and said throttle shaft are secured together by a locking screw or laser welding.

8. The small engine throttle module of claim 1 wherein: the sensing aperture below the intake pressure sensor is in communication with a pressure sampling aperture on the throttle body assembly.

9. The small engine throttle module of claim 1 wherein: said PCB is provided with an electronic control unit.

10. A small engine throttle module, comprising: a housing, a left side end of the housing is provided with a throttle position sensor ceramic substrate, a right end of which is provided with a PCB board; and a throttle position sensor rotor is disposed at the section The valve position sensor is directly connected between the ceramic substrate and the PCB board and the throttle shaft; the intake pressure sensor patch is on the back surface of the throttle position sensor ceramic substrate; and the detection pressure hole is provided below the intake pressure sensor, and the detection hole is The throttle air passage is connected; the back side of the PCB board is provided with an intake air temperature sensor electrically connected thereto, and the throttle position sensor ceramic substrate and the intake air pressure sensor are electrically connected through the jumper and the PCB board; the housing and the PCB board are The corresponding one side of the outer end is provided with an input and output interface, the interface and the PCB board Electrical connection; the housing is connected to the throttle body assembly <