WO2022111645A1

WO2022111645A1 - Energy-saving electric control valve and electric control fuel system

Info

Publication number: WO2022111645A1
Application number: PCT/CN2021/133654
Authority: WO
Inventors: 周传军; 姜林; 高德俊; 吕昊; 张艳波; 严济彦; 刘亚洲; 李建东
Original assignee: 亚普汽车部件股份有限公司
Priority date: 2020-11-27
Filing date: 2021-11-26
Publication date: 2022-06-02
Also published as: CN112392991A

Abstract

Disclosed is an energy-saving electric control valve, comprising a housing (20), a drive source (30), a guide rod (16), a first valve core (14), a second valve core (17), and a compressible component; also disclosed is an electric control fuel system using said energy-saving electric control valve; the electric control fuel system comprises a fuel tank (100), a liquid level sensor (105), a pressure sensor (106), a canister (107), and a controller (3), the liquid level sensor (105), the pressure sensor (106), and the energy-saving electric control valve all having an electric signal connection to the controller; a first connecting port (11) on the energy-saving electric control valve is connected to an exhaust port on the fuel tank, a second connecting port (23) is connected to an air inlet on the canister, a third connecting port (21) is connected to an atmosphere ventilation pipeline, and a fourth connecting port (22) is connected to an exhaust port on the canister; the energy-saving electric control valve blocks the communication between the fuel tank and the canister, preventing the excessive load on the canister due to oil vapour entering the canister, and reducing environmental pollution; by means of controlling the distance of movement of the drive source, control of the degree of openness of the channel can be controlled, so that the volume is precisely controlled during the process of filling and replenishing fuel.

Description

An energy-saving electric control valve and electric control fuel system

technical field

The invention relates to the technical field of fuel tanks, in particular to an energy-saving electronically controlled valve and an electronically controlled fuel system. The electronically controlled fuel system takes the electronically controlled valve as the core, and the electronically controlled fuel system is adapted to different vehicles by adjusting the electronically controlled valve. It can realize controllable fueling, vapor emission management, on-board diagnostic system (OBD) detection and other functions.

Background technique

In order to meet the increasingly strict laws and regulations, oil and gas must be sealed in the fuel system under certain conditions, and controlled by the fuel tank isolation valve. The interactive change of ambient temperature causes the pressure inside the fuel tank to also change interactively. If the pressure exceeds a certain range, it will cause The deformation of the fuel tank is too large, so the fuel tank isolation valve has a pressure protection function, that is, it will open if it exceeds a certain positive pressure or is lower than a certain negative pressure, and the fuel tank isolation valve does not have an opening control function.

The method of controlling the volume of the fuel system is realized by cutting off the oil vapor passage through a mechanical valve, but the accuracy of the volume will be affected by disturbances such as airflow fluctuations. If the fuel tank or valve is changed in the later stage, it will take a lot of time and cost.

Strict emission regulations require vehicles to have an on-board diagnostic system (OBD). The detection of the fuel system is to determine whether the system leaks by forming positive or negative pressure. At present, the OBD module of the fuel system is generally arranged on the path of the carbon canister to the atmosphere. A carbon canister solenoid valve is arranged on the channel between the canister and the atmosphere, which is used to block the channel between the carbon canister and the atmosphere to achieve the purpose of sealing the fuel system. The fuel tank isolation valve and the carbon canister solenoid valve are developed separately, with long cycle and high cost, and it is difficult to change during the development process.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an energy-saving electronically controlled valve and an electronically controlled fuel system, so as to solve the problems of low steam management accuracy, low integration, and difficulty in regulating different components in the existing fuel system, so as to improve the control accuracy of the fuel system, Detect potential leakage risks of fuel systems and reduce environmental pollution.

The present invention is achieved through the following technical solutions:

An energy-saving electric control valve, comprising a casing, a driving source, a guide rod, a first valve core, a second valve core and a compressible part;

A first connection port, a second connection port, a third connection port and a fourth connection port are arranged on the housing;

An electrically controlled valve passage is provided in the housing, and the electrically controlled valve passage is divided into a first electrically controlled valve passage and a second electrically controlled valve passage, wherein the first electrically controlled valve passage communicates with the first connection port and the second electrically controlled valve passage a connection port, the second electronically controlled valve channel communicates with the third connection port and the fourth connection port;

One end of the guide rod is connected with the driving source, a second valve core is arranged on the guide rod, the guide rod is inserted into the electric control valve channel, and the second valve core is located in the second valve core. In the passage of the electric control valve, it is used to control the turn-on or turn-off of the third connection port and the fourth connection port;

The first valve core is disposed in the first electronically controlled valve passage through the compressible part, and is not connected to the other end of the guide rod, and the first valve core is in the compressible part and/or the guide rod. Under the action of the rod, it is used to control the turn-on or turn-off of the first connection port and the second connection port.

Preferably, the axial centerline of the compressible member coincides with the axial centerline of the first valve core.

Preferably, the compressible member includes a first compressible member and a second compressible member, the first compressible member and the second compressible member being arranged in parallel.

Preferably, an actuator is provided at the end of the guide rod that is close to the first valve core, and the area of the circumscribed circle of the actuator is larger than the cross-sectional area of the guide rod.

An electronically controlled fuel system, using any one of the above energy-saving electronically controlled valves, further comprises a fuel tank, a liquid level sensor, a pressure sensor, a carbon canister and a controller;

The liquid level sensor is arranged in the fuel tank, the pressure sensor is arranged on the fuel tank or in the fuel tank or on the pipeline or flange connected with the fuel tank, the liquid level sensor, the pressure sensor and the energy-saving electronic control The valves are all connected with the electrical signal of the controller;

The first connection port on the energy-saving electronic control valve is connected to the exhaust port on the fuel tank through a pipeline, the second connection port is connected to the air inlet on the carbon canister through a pipeline, and the third connection port is connected to the atmosphere pipeline Connect, the fourth connection port is connected with the exhaust port on the carbon canister.

Preferably, when the vehicle is running, stopped or refilling the gun, the energy-saving electronically controlled valve is in an initial state, the first valve core is closed, and the second valve core is opened.

Preferably, when the ECU detects that the pressure exceeds the set upper limit value and/or the liquid level is lower than the set lower limit value, the energy-saving electronically controlled valve is adjusted to the filling state, and the first valve core and the second valve core are both in the on position.

Preferably, the electronically controlled fuel system further includes an OBD detection module for detecting whether the electronically controlled fuel system leaks, and the OBD detection module is arranged on the atmosphere venting pipeline.

Preferably, when the vehicle meets the OBD monitoring condition, the energy-saving electronically controlled valve is adjusted to the OBD diagnosis state, the first valve core is opened, and the second valve core is closed.

The beneficial effects of the present invention are:

1. The energy-saving electronic control valve can block the communication between the fuel tank and the carbon canister, prevent oil vapor from entering the carbon canister, prevent the carbon canister from being overloaded, and reduce environmental pollution.

2. The opening of the channel can be controlled by controlling the moving distance of the driving source, and the volume can be precisely controlled in the process of filling and replenishing fuel.

3. The energy-saving electric control valve has the function of cutting off the air path of the carbon canister, which can assist the fuel system in leak detection, find the risk of leakage as soon as possible, and reduce environmental pollution.

4. The fast response and high sensitivity of the energy-saving electronic control valve allow the fuel system to respond to the vehicle operating conditions at a faster speed and switch the working state.

Description of drawings

Fig. 1 is the schematic diagram of the prior art;

2 is a schematic diagram of an electronically controlled fuel system of the present invention;

Figure 3 is a schematic diagram of the working state when the energy-saving electronically controlled valve is partially opened;

Figure 4 is a schematic diagram of the working state of the energy-saving electronically controlled valve when it is fully opened;

Figure 5 is a schematic diagram of the working state of the energy-saving electronically controlled valve during OBD detection or auxiliary OBD detection;

6 is a schematic diagram of the state of another embodiment of the energy-saving electronically controlled valve when it is closed;

FIG. 7 is a control flow chart of the electronically controlled fuel system.

Detailed ways

The technical solutions of the present application are described in detail below through the examples. The following examples are only exemplary and can only be used to explain and illustrate the technical solutions of the present invention, but cannot be interpreted as limitations on the technical solutions of the present invention.

Fig. 1 is a schematic diagram of the prior art. There is a fuel tank isolation valve 1 between the fuel tank and the carbon canister, and a carbon canister isolation valve 2 between the carbon canister and the atmosphere. The two valves are independent components. The fuel tank isolation valve has the purpose of isolating the fuel tank, and also has an opening and closing function to adapt to different working conditions. The canister isolation valve is used to open and close the passage of atmosphere to the canister. The fuel tank isolation valve and the carbon canister isolation valve are separately controlled by the controller 3, and the carbon canister desorption valve 108 is used to control the purification of the carbon canister.

Aiming at the problems of low control precision, low integration, and difficulty in regulating different components in the current fuel system, the present invention provides an energy-saving electric control valve, which is preferably applied to the fuel system.

As shown in FIGS. 2 to 6 , the present application provides an energy-saving electronically controlled valve, which includes a housing 20 , and four openings are provided on the housing, which are a first connection port 11 , a second connection port 23 , and a first connection port 23 . There are three connection ports 21 and fourth connection ports 22, wherein the first connection port is connected to the fuel tank 100 through a pipeline, the second connection port is connected to the air intake of the carbon canister 107 through a pipeline, and the third connection port is connected to the atmosphere opening pipeline. connection, the fourth connection port is connected with the exhaust port on the carbon canister through a pipeline.

An electrically controlled valve passage is provided in the housing, and the electrically controlled valve passage is divided into a first electrically controlled valve passage 15 and a second electrically controlled valve passage 18 by a partition, wherein the first electrically controlled valve passage communicates with the first connection port and the second electrically controlled valve passage. Two connection ports, the second electric control valve channel communicates with the third connection port and the fourth connection port, and a guide rod perforation is arranged on the partition part.

The upper end of the guide rod 16 is connected to the driving source 30. In the technical solution of the present application, there is no restriction on the type of the driving source, such as motors, cylinders, electromagnetic coils, fuel engines, gas engines, etc. Technical solutions applicable to this application. The guide rod is followed by the second electric control channel 18, the guide rod perforation and the first electric control valve channel 15, the second valve core 17 is fixed on the guide rod, and the second valve core is located in the second electric control valve channel for controlling The third connection port and the fourth connection port are turned on or off.

The first valve core 14 is disposed in the first electronically controlled valve passage 15 through a compressible component, and is not connected to the lower end of the guide rod, and the first valve core is located on the compressible component and/or Under the action of the guide rod, it is used to control the turn-on or turn-off of the first connection port and the second connection port.

In this embodiment, the compressible member includes a first compressible member 12 and a second compressible member 13, the first compressible member and the second compressible member are arranged in parallel. In other embodiments of the present application, the compressible component may be an integral component, and in this case, the axial centerline of the compressible component coincides with the axial centerline of the first valve core to avoid pressure deviation.

As shown in FIG. 6 , an actuator 19 is provided at the lower end of the guide rod 16 , the circumscribed circle area of the actuator is larger than the cross-sectional area of the guide rod, the force application area increases, the force of the first spool is more uniform, and the actuator also Other shapes can be used, such as cones, cubes, cuboids, etc.

As shown in FIG. 2 , it is a schematic diagram of the electronically controlled fuel system of the present invention, which uses the above-mentioned energy-saving electronically controlled valve, and also includes a fuel tank, a liquid level sensor, a pressure sensor, a carbon canister and a controller.

The pressure sensor 106 is used to measure the steam pressure inside the fuel tank, and can be arranged inside the fuel tank or welded on the fuel tank. The liquid level sensor 105 is used to measure the liquid level inside the fuel tank. The controller is connected to the pressure sensor 106 and the liquid level sensor 105, and combined with the information of the vehicle ECU, adjusts the electronic control valve to suit different vehicle operating conditions.

As shown in FIG. 3 , under normal circumstances, the passage from the fuel tank 100 to the carbon canister 107 is closed, and the

compressible parts

12 and 13 are used to realize the self-closing of the first valve core without starting the motor, thus saving energy. At the initial position of the driving source, the guide rod does not touch the first valve core, which is convenient for reset control. The driving source drives the guide rod 16 to achieve linear motion. After contacting the first valve core 15, after overcoming the elastic force of the

compressible parts

12 and 13, the first valve core is pushed down, and the first valve core reaches the temporary position. The control valve passage is partially opened.

If the fuel system is partially opened and cannot be quickly exhausted under the condition of filling, the first electronically controlled valve channel needs to be fully opened. As shown in Figure 3, the driving source pushes the guide rod to continue to move, and the opening area of the first valve core Continue to increase, the first electronically controlled valve channel is fully opened.

After the filling is completed, due to the requirements of the filling operator or the owner of the vehicle, the first filling will continue to be added after skipping. The first electronic control channel opens a small opening to control the amount of supplementation. When the liquid level reaches its maximum value, the energy-saving electronically controlled valve remains in the closed position in Figure 2.

When the liquid level sensor detects that the liquid level in the fuel tank is filled to the rated liquid level Lrated, the exhaust port of the fuel tank is closed, and the pressure in the fuel tank increases to realize the jump gun. By controlling the opening of the exhaust port of the fuel tank, the replenishment function of the fuel tank is realized. In addition, when the vehicle starts to run, the energy-saving electronically controlled valve is in an initial state, and at this time, the first valve core closes the first electronically controlled valve channel, and the second valve core is opened.

As shown in Figure 5, when the vehicle needs to meet the OBD monitoring start conditions, the driving source control guide rod 16 continues to move to the position shown in Figure 5, the atmospheric port is closed, the fuel tank exhaust port is opened, and the fuel system is sealed. The pressure sensor detects the pressure in the fuel system within a certain period of time to determine whether there is a leak in the system. As the requirements of emission regulations become more and more stringent, the above-mentioned OBD detection mode has many restrictions, and additional OBD modules may be added to detect whether the system leaks. On the atmospheric pipeline connected to the connection port.

Fig. 7 is the control flow chart of the electronically controlled fuel system. The electronically controlled valve has a reset state. When the valve is used for the first time or encounters an emergency, the reset is performed. When the electronically controlled fuel system performs desorption, the energy-saving electronically controlled valve is adjusted to the desorption state. When the electronically controlled fuel system meets the OBD detection conditions, the energy-saving electronically controlled valve is adjusted to the OBD diagnosis state. At this time, the first spool is opened, and the second The second spool is closed.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and variations, the scope of the invention is defined by the appended claims and their equivalents.

Claims

An energy-saving electric control valve is characterized in that it comprises a casing, a driving source, a guide rod, a first valve core, a second valve core and a compressible part;

A first connection port, a second connection port, a third connection port and a fourth connection port are arranged on the housing;

An electrically controlled valve passage is provided in the housing, and the electrically controlled valve passage is divided into a first electrically controlled valve passage and a second electrically controlled valve passage, wherein the first electrically controlled valve passage communicates with the first connection port and the second electrically controlled valve passage a connection port, the second electronically controlled valve channel communicates with the third connection port and the fourth connection port;

One end of the guide rod is connected with the driving source, a second valve core is arranged on the guide rod, the guide rod is inserted into the electric control valve channel, and the second valve core is located in the second valve core. In the passage of the electric control valve, it is used to control the turn-on or turn-off of the third connection port and the fourth connection port;

The first valve core is disposed in the first electronically controlled valve passage through the compressible part, and is not connected to the other end of the guide rod, and the first valve core is in the compressible part and/or the guide rod. Under the action of the rod, it is used to control the turn-on or turn-off of the first connection port and the second connection port.
The energy-saving electronically controlled valve according to claim 1, wherein the axial centerline of the compressible member coincides with the axial centerline of the first valve core.
The energy-saving electronically controlled valve according to claim 1, wherein the compressible part comprises a first compressible part and a second compressible part, the first compressible part and the second compressible part Parallel setup.
The energy-saving electronically controlled valve according to claim 1, wherein an actuator is provided at the end of the guide rod that is close to the first valve core, and the area of the circumscribed circle of the actuator is larger than the transverse direction of the guide rod. cross-sectional area.
An electronically controlled fuel system, using the energy-saving electronically controlled valve according to any one of the above claims 1 to 1, is characterized in that, further comprising a fuel tank, a liquid level sensor, a pressure sensor, a carbon canister and a controller;

The liquid level sensor is arranged in the fuel tank, the pressure sensor is arranged on the fuel tank or in the fuel tank or on the pipeline or flange connected with the fuel tank, the liquid level sensor, the pressure sensor and the energy-saving electronic control The valves are all connected with the electrical signal of the controller;

The first connection port on the energy-saving electronic control valve is connected to the exhaust port on the fuel tank through a pipeline, the second connection port is connected to the air inlet on the carbon canister through a pipeline, and the third connection port is connected to the atmosphere pipeline Connect, the fourth connection port is connected with the exhaust port on the carbon canister.
The electronically controlled fuel system according to claim 5, characterized in that, when the vehicle is running, stopped or refilling jumps, the energy-saving electronically controlled valve is in an initial state, the first valve core is closed, and the second valve core is opened .
The electronically controlled fuel system according to claim 5, wherein when the ECU detects that the pressure exceeds the set upper limit value and/or the liquid level is lower than the set lower limit value, the energy-saving electronically controlled valve is adjusted to increase Note that both the first valve core and the second valve core are in the open position.
The electronically controlled fuel system according to claim 5, wherein the electronically controlled fuel system further comprises an OBD detection module for detecting whether the electronically controlled fuel system leaks, and the OBD detection module is arranged on the atmosphere venting pipeline.
The electronically controlled fuel system according to claim 8, wherein when the vehicle meets the OBD monitoring condition, the energy-saving electronically controlled valve is adjusted to the OBD diagnosis state, the first valve core is opened, and the second valve core is closed.