Three-way valve sealing performance and flow detection system

Abstract

The utility model discloses a three-way valve sealing performance and flow detection system. The detection system comprises a test loop and a response test device, wherein the test loop comprises a main pipeline, a first branch pipeline, a second branch pipeline, a third branch pipeline and a fourth branch pipeline; a first pressure sensor, a first control valve, a pressure regulating valve and a third control valve are sequentially arranged on the main pipeline; two ends of a fourth branch pipeline are respectively connected to the main pipeline at two ends of the third control valve; a second control valve and a flow meter are arranged on the fourth branch pipeline; a second pressure sensor and a fourth control valve are respectively arranged on the first branch pipeline, a third pressure sensor and a fifth control valve are respectively arranged on the second branch pipeline, and a fourth pressure sensor, a sixth control valve and a pressure reducing valve are respectively arranged on the third branch pipeline. The reliability of the three-way valve can be guaranteed.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of three-way valve detection, and in particular to a three-way valve sealing and flow detection system. Background Art

[0002] The vehicle braking system is developing towards the direction of wire control, and the main structural form is currently the electronic mechanical hydraulic system. The wire control brake system is mainly composed of a master cylinder, an electric cylinder, a motor, a solenoid valve, a motor position sensor, a pedal displacement sensor, a pressure sensor and an ECU (Electronic Control Unit); when the driver steps on the brake pedal, the ECU of the wire control brake system will detect the change in the pedal displacement sensor connected to the pedal, and then determine the brake pressure required by the electric cylinder based on the change in the value and require the motor to work. The motor drives the electric cylinder to compress the brake fluid to build up the fluid pressure and transmit it to the wheel cylinder, thereby providing braking force to the vehicle.

[0003] The main structure of the three-way valve is that there are three valve oil ports on the valve body. When used in the wire control brake system, its second valve oil port is connected to the wheel cylinder of the wire control brake system, the first valve oil port is connected to the electric cylinder of the wire control brake system, and the third valve oil port is connected to the master cylinder. In the backup brake mode, the three-way valve is not energized. At this time, the valve core of the three-way valve cuts off the connection between the first valve oil port and the second valve oil port, and the second valve oil port is connected to the third valve oil port, so that the liquid in the brake master cylinder can flow to the wheel cylinder; in the wire control brake mode, the coil of the three-way valve is energized, the moving iron and the valve body are attracted, and the valve stem on the moving iron moves downward, so that the valve core moves downward and cuts off the connection between the second valve oil port and the third valve oil port of the three-way valve, so that the first valve oil port and the second valve oil port are connected, and the liquid in the electric cylinder can flow to the wheel cylinder.

[0004] The three-way valve is a safety component of the wire control brake system, and its performance is directly related to the personal safety of the driver. However, there is no technical literature that comprehensively tests various performance parameters of the three-way valve. Utility Model Content

[0005] The embodiment of the utility model provides a three-way valve sealing and flow detection system, which performs comprehensive detection on the sealing and flow of the three-way valve to ensure safety and reliability when applied to a wire control brake system.

[0006] The utility model embodiment provides a three-way valve sealing and flow detection system, the three-way valve includes a first valve oil port, a second valve oil port and a third valve oil port, the detection system includes a test circuit, wherein:

[0007] The test circuit includes a main pipeline, a first branch pipeline, a second branch pipeline, a third branch pipeline and a fourth branch pipeline, one end of the main pipeline is used as a pressure oil inlet, the other end of the main pipeline is connected to one end of the first branch pipeline and the third branch pipeline respectively, and the other ends of the first branch pipeline and the second branch pipeline are connected to the first valve oil port and the third valve oil port respectively;

[0008] The main pipeline between the pressure oil inlet and the first branch pipeline is provided with a first pressure sensor, a first control valve, a pressure regulating valve and a third control valve in sequence; the two ends of the fourth branch pipeline are respectively connected to the main pipeline at both ends of the third control valve, and the fourth branch pipeline is provided with a second control valve and a flow meter;

[0009] The first branch pipeline is respectively provided with a second pressure sensor and a fourth control valve, the second branch pipeline is respectively provided with a third pressure sensor and a fifth control valve, one end of the third branch pipeline is connected to the second valve oil port, and the other end of the third branch pipeline serves as an oil drain port, and the third branch pipeline is respectively provided with a fourth pressure sensor, a sixth control valve and a pressure reducing valve.

[0010] As an optional implementation, in the embodiment of the utility model, the first branch pipeline, the third branch pipeline and the second branch pipeline are also connected to sampling cylinders respectively.

[0011] As an optional implementation, in an embodiment of the utility model, the main pipe is also connected to an accumulator, and the accumulator is connected to one end of the main pipe close to the pressure oil inlet.

[0012] Compared with the prior art, the beneficial effects of the embodiments of the present invention are:

[0013] The embodiment of the utility model tests the sealing and flow rate between the first valve oil port and the second valve oil port, and between the second valve oil port and the third valve oil port of the three-way valve by controlling the on and off of the first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve, the sixth control valve, the pressure regulating valve, and the pressure reducing valve, as well as whether the coil is energized, thereby comprehensively testing the sealing and flow rate performance of the three-way valve, ensuring the reliability of the three-way valve and guaranteeing the safety when used in a brake-by-wire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a three-way valve sealing and flow detection system provided by an embodiment of the utility model;

[0015] Figure 2 It is a structural schematic diagram of a test circuit provided by an embodiment of the utility model;

[0016] Figure 3It is a flow chart of a method for testing the sealing performance between a first valve oil port and a second valve oil port provided in an embodiment of the utility model;

[0017] Figure 4 It is a flow chart of a method for testing flow between a first valve oil port and a second valve oil port provided by an embodiment of the utility model;

[0018] Figure 5 It is a flow chart of a method for testing the sealing performance between the second valve oil port and the third valve oil port provided in an embodiment of the utility model;

[0019] Figure 6 It is a flow chart of a method for testing flow between the second valve oil port and the third valve oil port provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the utility model clearer, the specific embodiments of the utility model are further described in detail below in conjunction with the accompanying drawings. It should be noted that, under the premise of no conflict, the various embodiments described below or the various technical features can be arbitrarily combined to form a new embodiment. Except for special instructions, the materials and equipment used in this embodiment can be purchased from the market. Examples of embodiments are shown in the accompanying drawings, in which the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0021] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "plurality" means two or more, unless otherwise precisely and specifically specified.

[0022] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be connected through an intermediary medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] Embodiment 1

[0025] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of a three-way valve sealing and flow detection system disclosed in one embodiment of the utility model. Figure 1 As shown, the three-way valve sealing and flow detection system includes: a test circuit for sealing and flow testing, and a certain control device.

[0026] Specifically, the test circuit mainly includes pressure / flow detection module and oil / gas circuit module, please refer to Figure 2 As shown, the pressure / flow detection module mainly includes a first pressure sensor 71, a second pressure sensor 73, a third pressure sensor 74, a fourth pressure sensor 75, and a flow meter 72, the oil / gas module mainly includes a main pipeline, a first branch pipeline, a second branch pipeline, a third branch pipeline and a fourth branch pipeline, and the control device can be a control valve, a pressure regulating valve and a pressure reducing valve, and a three-way valve coil that is energized to perform corresponding control modules, etc.

[0027] One end of the main pipeline serves as a pressure oil inlet 82. By supplying a certain amount of pressure oil (or gas) at the pressure oil inlet, a certain pressure is provided for the test circuit. The other end of the main pipeline is connected to one end of the first branch pipeline and the second branch pipeline respectively. The other ends of the first branch pipeline and the second branch pipeline are connected to the first valve oil port 517 and the third valve oil port 519 of the three-way valve 50 respectively.

[0028] The pressure oil inlet 82 is used to communicate with the pump station tank connected to the pressure oil, and the first pressure sensor 71, the first control valve 61, the pressure regulating valve 62 and the third control valve 63 are sequentially arranged on the main pipeline between the pressure oil inlet 82 and the first branch pipeline; the two ends of the fourth branch pipeline are respectively connected to the main pipelines at both ends of the third control valve 63, and the second control valve 64 and the flow meter 72 are arranged on the fourth branch pipeline.

[0029] The first branch pipeline is respectively provided with a second pressure sensor 73 and a fourth control valve 65, the second branch pipeline is respectively provided with a third pressure sensor 74 and a fifth control valve 66, one end of the third branch pipeline is connected to the second valve oil port 523 of the three-way valve 50, and the other end of the third branch pipeline is used as an oil drain port, and the third branch pipeline is respectively provided with a fourth pressure sensor 75, a sixth control valve 67 and a pressure reducing valve 68.

[0030] Since the pressure stability requirement on the test circuit is very high during the performance test, an accumulator 81 is set at one end of the main pipeline close to the pressure oil inlet to ensure the stability of the pressure in the test circuit. In addition, the first branch pipeline, the third branch pipeline and the second branch pipeline can be connected with a first sampling cylinder 83, a second sampling cylinder 84 and a third sampling cylinder 85 respectively, for sampling and analyzing the oil / gas in each branch pipeline.

[0031] There are many ways to control the power supply of the coil. For example, an electronic switch can be set between the coil and the coil power supply (the electronic switch can be regarded as a coil driving module), and the power supply of the coil can be controlled by controlling the on and off of the electronic switch.

[0032] The above-mentioned three-way valve sealing and flow detection system is used to detect the sealing and flow of the three-way valve by controlling the on and off of the first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve, the sixth control valve, the pressure regulating valve, and the pressure reducing valve, as well as whether the coil is energized or not, to test the sealing and flow between the first valve oil port and the second valve oil port, and between the second valve oil port and the third valve oil port of the three-way valve.

[0033] Specifically, test the sealing between the first valve oil port and the second valve oil port of the three-way valve, please refer to Figure 3 As shown, it may include the following steps:

[0034] S111, control the first control valve, the third control valve and the fifth control valve to be turned on, control the second control valve, the fourth control valve and the sixth control valve to be turned off, and the control coil is not energized.

[0035] S112, configuring pressure at the pressure oil inlet, and adjusting the pressure through the pressure regulating valve so that the pressure of the third pressure sensor reaches the first target pressure.

[0036] The first target pressure is set as required, and may be the same as or different from the subsequent second target pressure, third target pressure, and fourth target pressure setting values.

[0037] S113, counting the first pressure change per unit time of the fourth pressure sensor, when the first pressure change is less than the first preset pressure, the sealing between the first valve oil port and the second valve oil port is qualified.

[0038] After the pressure of the third pressure sensor reaches the first target pressure and stabilizes for a certain period of time (preset time), the first pressure change per unit time of the fourth pressure sensor is counted. Stable for a certain period of time here means that the pressure of the third pressure sensor continues to be the first target pressure for a preset time, or the duration within the acceptable fluctuation range of the first target pressure reaches a preset time. The first pressure change can be any first pressure change per unit time, or it can be the average of pressure changes per multiple unit times.

[0039] When the first pressure variation is small enough, it indicates that the sealing performance between the first valve oil port and the second valve oil port is good, and the first pressure variation and the preset pressure can be compared to judge whether the sealing performance between the first valve oil port and the second valve oil port meets the requirements. For example, when the first pressure variation is less than the first preset pressure, the sealing performance between the first valve oil port and the second valve oil port is qualified.

[0040] Test the tightness between the first and second valve ports of the three-way valve. Figure 4 As shown, it may include the following steps:

[0041] S121, control the first control valve, the second control valve, the fourth control valve and the sixth control valve to be turned on, control the third control valve and the fifth control valve to be turned off, and energize the control coil.

[0042] S122, configuring pressure at the pressure oil inlet, and adjusting the pressure through the pressure regulating valve so that the pressure of the second pressure sensor reaches the second target pressure.

[0043] S123, regulating the pressure through the pressure reducing valve to establish a first pressure difference between the first valve oil port and the second valve oil port, and obtaining a first flow value of the flow meter, that is, the flow value between the first valve oil port and the second valve oil port.

[0044] The first pressure difference is also set according to the needs. After the first pressure difference is established, the first flow value of the flow meter is obtained after the pressure (first pressure difference) is stabilized for a certain period of time. The first flow value can be used to determine the flow value between the first valve oil port and the second valve oil port under the first pressure difference. The first pressure difference and the flow can characterize the size of the resistance. When the first pressure difference is constant, the larger the flow, the smaller the resistance. That is, when the first flow value is greater than the first preset flow, the flow between the first valve oil port and the second valve oil port meets the requirements.

[0045] Similarly, test the tightness between the second and third valve ports of the three-way valve, refer to Figure 5 As shown, it may include the following steps:

[0046] S131, controlling the first control valve, the third control valve and the fourth control valve to be turned on, controlling the second control valve, the fifth control valve and the sixth control valve to be turned off, and the control coil is not energized;

[0047] S132, configuring pressure at the pressure oil inlet, and adjusting the pressure through the pressure regulating valve so that the pressure of the second pressure sensor reaches a third target pressure;

[0048] S133, after the third target pressure is stable for a certain period of time, the second pressure change per unit time of the fourth pressure sensor is counted, and when the second pressure change is less than the second preset pressure, the sealing between the second valve oil port and the third valve oil port is qualified.

[0049] To test the flow rate between the second and third valve ports of the three-way valve, refer to Figure 6 As shown, it may include the following steps:

[0050] S141, control the first control valve, the second control valve, the fifth control valve and the sixth control valve to be turned on, control the third control valve and the fourth control valve to be turned off, and energize the control coil.

[0051] S142, configuring pressure at the pressure oil inlet, and regulating the pressure through the pressure regulating valve so that the pressure of the third pressure sensor reaches a fourth target pressure.

[0052] S143, regulating the pressure through the pressure reducing valve to establish a second pressure difference between the second valve oil port and the third valve oil port. After the second pressure difference is stable for a certain period of time, the second flow value of the flow meter is obtained, which is the flow value between the second valve oil port and the third valve oil port.

[0053] The above is a detailed introduction to a three-way valve sealing and flow detection system disclosed in the utility model. Specific examples are used in this article to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model; at the same time, for general technical personnel in this field, according to the idea of ​​the utility model, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. A three-way valve sealing and flow detection system, the three-way valve comprising a first valve oil port, a second valve oil port and a third valve oil port, characterized in that: The detection system comprises a test loop, wherein: The test circuit includes a main pipeline, a first branch pipeline, a second branch pipeline, a third branch pipeline and a fourth branch pipeline, one end of the main pipeline is used as a pressure oil inlet, the other end of the main pipeline is connected to one end of the first branch pipeline and one end of the second branch pipeline respectively, and the other ends of the first branch pipeline and the second branch pipeline are connected to the first valve oil port and the third valve oil port respectively; The main pipeline between the pressure oil inlet and the first branch pipeline is provided with a first pressure sensor, a first control valve, a pressure regulating valve and a third control valve in sequence; the two ends of the fourth branch pipeline are respectively connected to the main pipeline at both ends of the third control valve, and the fourth branch pipeline is provided with a second control valve and a flow meter; The first branch pipeline is respectively provided with a second pressure sensor and a fourth control valve, the second branch pipeline is respectively provided with a third pressure sensor and a fifth control valve, one end of the third branch pipeline is connected to the second valve oil port, and the other end of the third branch pipeline serves as an oil drain port, and the third branch pipeline is respectively provided with a fourth pressure sensor, a sixth control valve and a pressure reducing valve.

2. The three-way valve sealing and flow detection system according to claim 1, characterized in that: The first branch pipeline, the third branch pipeline and the second branch pipeline are also connected to sampling cylinders respectively.

3. The three-way valve sealing and flow detection system according to claim 1, characterized in that: The main pipe is also connected to an accumulator, and the accumulator is connected to one end of the main pipe close to the pressure oil inlet.

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