Pulsed brake fluid replacement device

Abstract

The utility model provides a kind of pulse type brake oil replacement device, including oil pump, electronic pressure relief valve, first communicating vessel, second communicating vessel, oil pipeline and control unit, the first communicating vessel, oil pump, second communicating vessel and electronic pressure relief valve are sequentially connected by oil pipeline and form annular oil circuit;The oil pipeline further includes the oil inlet pipe connected with the first communicating vessel and the oil outlet pipe connected with the second communicating vessel;The control unit includes oil pump control module, solenoid valve control module and main control module, the oil pump control module is under the control of main control module to the motor output drive current of oil pump, so that the brake oil in new oil pot enters annular oil circuit and is output to vehicle brake system by oil outlet pipe;The solenoid valve control module is under the control of main control module to the on-off control signal output to electronic pressure relief valve, so that the oil pressure in annular oil circuit fluctuates according to preset mode.The utility model can effectively reduce the air in oil circuit, so that brake oil replacement is more thorough.

Description

Technical Field

[0001] This utility model relates to the field of vehicle maintenance equipment, and more specifically, to a pulse-type brake fluid replacement device. Background Technology

[0002] With the continuous development of technology, automobiles are becoming increasingly common. Car maintenance is an effective way to extend the lifespan of a vehicle and ensure its safe operation.

[0003] Changing brake fluid is an important part of car maintenance. However, existing methods of changing brake fluid have problems such as incomplete fluid replacement and air easily entering the brake system lines. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a pulse-type brake fluid replacement device to address the problems of incomplete brake fluid replacement and easy entry of air into the vehicle's brake system pipeline.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is to provide a pulse-type brake fluid replacement device, including an oil pump, an electronic pressure relief valve, a first communicating vessel, a second communicating vessel, an oil supply pipeline, and a control unit. The first communicating vessel, the oil pump, the second communicating vessel, and the electronic pressure relief valve are sequentially connected in a ring-shaped oil circuit through the oil supply pipeline. The oil supply pipeline also includes an inlet pipe for connecting a new oil reservoir and an outlet pipe for injecting oil into the vehicle's braking system. The inlet pipe is connected to the first communicating vessel, and the outlet pipe is connected to the second communicating vessel. The control unit includes an oil pump control module and a solenoid valve. The system includes a control module and a main control module, with the oil pump control module and the solenoid valve control module respectively connected to the main control module via signal connections. The oil pump control module is electrically connected to the motor of the oil pump and, under the control of the main control module, outputs a drive current to the motor of the oil pump, causing the brake fluid in the new reservoir to enter the annular oil circuit through the inlet pipe and to be output from the annular oil circuit to the vehicle's braking system through the outlet pipe. The solenoid valve control module is electrically connected to the electronic pressure relief valve and, under the control of the main control module, outputs an on / off control signal to the electronic pressure relief valve, causing the oil pressure in the annular oil circuit to fluctuate according to a preset pattern.

[0006] As a further improvement of this utility model, the electronic pressure relief valve is switched on and off once every 1 second under the control of the main control module and the solenoid valve control module.

[0007] As a further improvement of this utility model, the electronic pressure relief valve is turned on for 0.05 to 0.95 seconds each time under the control of the main control module and the solenoid valve control module.

[0008] As a further improvement of this utility model, the control unit includes an overcurrent protection module, which is electrically connected to the oil pump control module and outputs an overcurrent signal to the main control module when the output current of the oil pump control module is greater than a preset value.

[0009] As a further improvement of this utility model, the control unit includes a digital tube display module, a digital tube driving circuit, a button, and a button circuit. The button circuit and the digital tube driving circuit are electrically connected to the main control module, and the button circuit is triggered by the button to generate an input signal and transmit the input signal to the main control module. The digital tube driving circuit is electrically connected to the digital tube display module and drives the corresponding digital tube in the digital tube display module to emit light under the control of the main control module.

[0010] As a further improvement of this utility model, the oil pipeline includes a first oil pipeline and a second oil pipeline. The first connector is a tee. The end of the oil inlet pipe, the beginning of the first oil pipeline, and the end of the second oil pipeline are respectively connected to the tee. The beginning of the oil inlet pipe is used to connect to a new oil container. The end of the first oil pipeline is connected to the inlet of the oil pump, and the beginning of the second oil pipeline is connected to the outlet of the electronic pressure relief valve.

[0011] As a further improvement of this utility model, the oil supply pipeline includes a third oil supply pipe and a fourth oil supply pipe. The second connector is a four-way connector. The first end of the oil outlet pipe, the end of the third oil supply pipe, and the first end of the fourth oil supply pipe are respectively connected to the four-way connector. The end of the oil outlet pipe is used to connect to the vehicle braking system. The first end of the third oil supply pipe is connected to the outlet of the oil pump, and the end of the fourth oil supply pipe is connected to the inlet of the electronic pressure relief valve.

[0012] As a further improvement of this utility model, a pressure gauge is also connected to the four-way valve.

[0013] As a further improvement of this utility model, the motor of the oil pump is a DC motor, the oil pump control module is composed of a DC motor drive circuit, and the DC motor drive circuit generates a preset DC voltage according to the first PWM signal output by the main control module and outputs it to the DC motor.

[0014] As a further improvement of this utility model, the electronic pressure relief valve includes an electromagnetic unit, and the electromagnetic valve control module generates intermittent on-state voltage and off-state voltage by means of a second PWM signal from the main control module and outputs them to the electromagnetic unit.

[0015] This invention has the following advantages: by setting an oil pump and an electronic pressure relief valve in the annular oil circuit, a pulsed high pressure is formed in the annular oil circuit. Thus, during the brake fluid filling process, the brake fluid can be pulsed to flush the oil circuit of the brake system and push out air bubbles in the oil circuit, effectively reducing the amount of air entering the oil circuit, thereby making the brake fluid replacement more thorough. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the annular oil circuit in the pulse brake fluid replacement device provided in this embodiment of the present invention.

[0017] Figure 2 This is a block diagram of the control unit in the pulse brake fluid replacement device provided in this embodiment of the utility model.

[0018] Figure 3 This is a circuit topology diagram of the oil pump control module in the pulse brake fluid replacement device provided in this embodiment of the utility model.

[0019] Figure 4 This is a circuit topology diagram of the solenoid valve control module in the pulse brake fluid replacement device provided in this embodiment of the utility model. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] like Figure 1 , Figure 2 The diagram shown is a schematic of a pulse-type brake fluid replacement device provided in an embodiment of this utility model. This pulse-type brake fluid replacement device can be used to replace the brake fluid in a vehicle. The pulse-type brake fluid replacement device of this embodiment includes an oil pump 10, an electronic pressure relief valve 20, a first connecting vessel 30, a second connecting vessel 40, an oil supply pipeline, and a control unit. The first connecting vessel 30, oil pump 10, second connecting vessel 40, and electronic pressure relief valve 20 are sequentially connected in a ring-shaped oil circuit via the oil supply pipeline. The oil supply pipeline includes multiple independent pipes (e.g., made of corrosion-resistant metal or polymer materials). Specifically, the first connecting vessel 30 is connected to the oil pump 10 via an independent pipe, the oil pump 10 is connected to the second connecting vessel 40 via another independent pipe, the second connecting vessel 40 is connected to the electronic pressure relief valve 20 via yet another independent pipe, and the electronic pressure relief valve 20 is connected to the first connecting vessel 30 via yet another independent pipe. The above-mentioned connection refers to the hydraulic oil in the pipe flowing between two devices. The length of the pipe between the two devices is related to the distance between each device. The connection (sealed connection) between the pipe and each device can adopt the conventional structure in this field, which will not be described in detail here.

[0022] The oil supply pipeline also includes an inlet pipe 55 for connecting to a new oil reservoir 70 and an outlet pipe 56 for injecting brake fluid into the vehicle's braking system 80. The new oil reservoir 70 can hold brake fluid to be added. The inlet pipe 55 is connected to the first connector 30 (i.e., the end of the inlet pipe 55 not connected to the new oil reservoir 70 is connected to the first connector 30), and the outlet pipe 56 is connected to the second connector 40 (i.e., the end of the outlet pipe 56 not connected to the vehicle's braking system 80 is connected to the second connector 40). The oil pump 10, electronic pressure relief valve 20, first connector 30, second connector 40, and the oil supply pipeline connecting the various devices are all installed in a cabinet, with at least a portion of the inlet pipe 55 and the outlet pipe 56 extending outside the cabinet.

[0023] The oil pump 10 pressurizes the liquid (brake fluid) flowing in through its inlet and outputs it through its outlet, meaning the oil pressure in the pipelines on both sides of the oil pump 10 is different. The electronic pressure relief valve 20 can connect or disconnect the pipelines on both sides; that is, when the electronic pressure relief valve 20 is in the connected state, the oil pressure in the pipelines on both sides is the same, and when it is in the disconnected state, the oil pressure on both sides can be different. The first communicating vessel 30 and the second communicating vessel 40 are used to connect three or more pipelines, and the pressure in all pipelines connected to the first communicating vessel 30 or the second communicating vessel 40 is basically the same. That is, when the oil pump 10 is working and the electronic pressure relief valve 20 is disconnected, the oil pressure in the pipelines between the electronic pressure relief valve 20, the first communicating vessel 30, and the oil pump 10 in the annular oil circuit is basically the same, and the oil pressure in the pipelines between the oil pump 10, the second communicating vessel 40, and the electronic pressure relief valve 20 is also basically the same.

[0024] The control unit includes a main control module 91, an oil pump control module 92, and a solenoid valve control module 93, which can be integrated onto one or more printed circuit boards. The main control module 91 can be composed of a microcontroller chip (MCU) and peripheral circuitry, generating and outputting control signals according to preset control logic. The oil pump control module 92 and the solenoid valve control module 93 are respectively connected to the main control module 91 and obtain control signals from it. Specifically, the main control module 91 can adopt a commonly used solution in the art, as long as it can output two different control signals.

[0025] The aforementioned oil pump control module 92 is electrically connected to the motor of oil pump 10, and under the control of the main control module 91, outputs drive current to the motor of oil pump 10, causing the brake fluid in the new oil reservoir to enter the annular oil circuit through the oil inlet pipe 55 and to be output to the vehicle braking system through the oil outlet pipe 56. The solenoid valve control module 93 is electrically connected to the electronic pressure relief valve 20, and under the control of the main control module 91, outputs on / off control signals to the electronic pressure relief valve 20, causing the oil pressure in the annular oil circuit to fluctuate according to a preset pattern. When the oil pump 10 operates under the control of the main control module 91 and the oil pump control module 92, a negative pressure is formed at its inlet, which can draw the brake fluid in the new oil reservoir 70 connected to the oil inlet pipe 55 into the annular oil circuit. When the electronic pressure relief valve 20 is intermittently opened and closed under the control of the main control module 91 and the solenoid valve control module 93, the oil pressure in the pipeline between the oil pump 10, the second connector 40 and the electronic pressure relief valve 20 fluctuates in a preset manner (e.g., a preset frequency), and the oil outlet pipe 56 can inject the brake fluid with the above pressure fluctuations into the vehicle braking system.

[0026] The aforementioned pulse-type brake fluid replacement device, by installing an oil pump 10 and an electronic pressure relief valve 20 in the annular oil circuit, creates a pulse-type high pressure in the annular oil circuit. Thus, during the brake fluid filling process, the brake fluid can be pulsed to flush the oil circuit of the brake system, while pushing out air bubbles in the oil circuit, effectively reducing the amount of air entering the oil circuit, thereby making the brake fluid replacement more thorough.

[0027] In one embodiment of this utility model, the electronic pressure relief valve 20 is switched on and off once per second under the control of the main control module 91 and the solenoid valve control module 93. Specifically, the conduction time of the electronic pressure relief valve 20 under the control of the main control module 91 and the solenoid valve control module 93 is 0.05 to 0.95 seconds, that is, the conduction time of the electronic pressure relief valve 20 is 0.05-0.95 seconds per second, and it is off for the rest of the time. In practical applications, the frequency of the electronic pressure relief valve 20's on and off and the conduction duration of each cycle can be determined by the control logic of the main control module 91, and can be preset as needed, for example, it can be set according to different vehicle models.

[0028] Similarly, the oil pressure in the annular oil circuit (the section between oil pump 10, second connector 40, and electronic pressure relief valve 20) can be set as needed. The main control module 91 can output a control signal to the oil pump control module 92 according to the set oil pressure, so that the oil pump 10 operates in a preset mode. For example, the oil pressure in the annular oil circuit can be set to 5-30 PSI depending on the vehicle model.

[0029] In one embodiment of this utility model, the control unit further includes an overcurrent protection module, which can also be integrated onto a printed circuit board and electrically connected to the oil pump control module 92. Specifically, the overcurrent protection module is electrically connected to the output terminal of the oil pump control module 92, thereby acquiring the current output to the motor of the oil pump 10 (i.e., the operating current of the motor of the oil pump 10), and outputting an overcurrent signal to the main control module 91 when the output current of the oil pump control module 92 exceeds a preset value. Thus, the main control module 91 can output instructions to the oil pump control module 92 according to preset control logic, causing the motor of the oil pump 10 to reduce power or stop working, and simultaneously output alarm signals, etc. Through the overcurrent protection module, overcurrent in the oil pump 10 can be avoided during oil change, extending the service life of the oil pump 10.

[0030] In one embodiment of this utility model, the control unit further includes a digital tube display module, a digital tube driving circuit 94, buttons, and a button circuit 95. The button circuit 95 and the digital tube driving circuit 94 are integrated onto a printed circuit board and electrically connected to the main control module 91. The button circuit 95 generates an input signal (converting the mechanical action of the button into an electrical signal) triggered by a button and transmits the input signal to the main control module 91, thereby enabling signal input to set or adjust the control logic of the main control module 91 and control the pulse-type brake fluid replacement device. The digital tube driving circuit 94 is electrically connected to the digital tube display module and, under the control of the main control module 91, drives the corresponding digital tube in the digital tube display module to emit light, thereby displaying signals such as system parameters and operating status. Through the digital tube display module, the digital tube driving circuit 94, the buttons, and the button circuit 95, human-machine interaction with the pulse-type brake fluid replacement device can be achieved.

[0031] In practical applications, the aforementioned buttons may include start buttons, stop buttons, and parameter adjustment buttons (such as adjusting oil pressure, adjusting the frequency and working time of the electronic pressure relief valve 20, etc.). The oil filling process of the aforementioned pulse brake fluid replacement device can be controlled through these buttons.

[0032] In one embodiment of this utility model, the oil pipeline includes a first oil pipeline 51 and a second oil pipeline 52, and the first communicating vessel 30 is a tee (i.e., it includes three interconnected interfaces). The end of the inlet pipe 55, the beginning of the first oil pipeline 51, and the end of the second oil pipeline 52 are respectively connected to different interfaces of the tee. The beginning of the inlet pipe 55 is used to connect to the new oil reservoir 70, the end of the first oil pipeline 51 is connected to the inlet of the oil pump 10, and the beginning of the second oil pipeline 52 is connected to the outlet of the electronic pressure relief valve 20. Of course, in practical applications, other devices, such as pressure sensors, can also be connected between the first communicating vessel 30 and the oil pump 10 and the electronic pressure relief valve 20, which will not be elaborated here.

[0033] In one embodiment of this utility model, the aforementioned oil supply pipeline includes a third oil supply pipe 53 and a fourth oil supply pipe 54, and the second communicating vessel 40 is a four-way connector (i.e., it includes four interconnected interfaces). The beginning of the oil outlet pipe 56, the end of the third oil supply pipe 53, and the beginning of the fourth oil supply pipe 54 are respectively connected to different interfaces of the four-way connector. The end of the oil outlet pipe 56 is used to connect to the vehicle braking system, the beginning of the third oil supply pipe 53 is connected to the outlet of the oil pump 10, and the end of the fourth oil supply pipe 54 is connected to the inlet of the electronic pressure relief valve 20. Of course, in practical applications, other devices, such as pressure sensors, can also be connected between the second communicating vessel 40 and the oil pump 10 and the electronic pressure relief valve 20, which will not be elaborated here.

[0034] To provide a clear view of the operating status of the oil pump 10, a pressure gauge 60 is also connected to the aforementioned four-way valve. By reading the pressure value of the pressure gauge 60, the oil pressure injected into the vehicle's braking system can be directly obtained.

[0035] In one embodiment of this utility model, the motor of the oil pump 10 is a DC motor, and correspondingly, as shown in the figure... Figure 3 As shown, the oil pump control module 92 is composed of a DC motor drive circuit, which generates a preset DC voltage based on the first PWM signal output by the main control module 91 and outputs it to the DC motor. The larger the pulse width from the first PWM signal, the larger the output voltage of the oil pump control module 92, and correspondingly, the larger the output power of the motor of the water pump 10. Those skilled in the art will understand that in practical applications, the oil pump control module 92 can also use other existing motor drive circuits, as long as they can control the operation of the oil pump 10; further details will not be provided here.

[0036] In one embodiment of this invention, the electronic pressure relief valve 20 includes an electromagnetic unit (e.g., a coil). The solenoid valve control module 93 generates intermittent on-state and off-state voltages from a second PWM signal from the main control module 91 and outputs them to the electromagnetic unit. For example, when the solenoid valve control module 93 outputs an on-state voltage, the electromagnetic unit generates a magnetic field, attracting the valve core and causing the electronic pressure relief valve 20 to turn on; when the solenoid valve control module 93 outputs an off-state voltage, the electromagnetic unit does not generate a magnetic field, and the electronic pressure relief valve 20 turns off. Those skilled in the art will understand that in practical applications, the solenoid valve control module 93 can also use other existing circuits, as long as they can control the electronic pressure relief valve 20 to turn on and off in a preset manner; further details are omitted here.

[0037] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A pulse-type brake fluid replacement device, characterized in that, The system includes an oil pump, an electronic pressure relief valve, a first communicating vessel, a second communicating vessel, an oil supply pipeline, and a control unit. The first communicating vessel, oil pump, second communicating vessel, and electronic pressure relief valve are sequentially connected through the oil supply pipeline to form a ring-shaped oil circuit. The oil supply pipeline also includes an inlet pipe for connecting a new oil reservoir and an outlet pipe for injecting oil into the vehicle's braking system. The inlet pipe is connected to the first communicating vessel, and the outlet pipe is connected to the second communicating vessel. The control unit includes an oil pump control module, a solenoid valve control module, and a main control module. The oil pump control module and the solenoid valve control module are respectively signal-connected to the main control module. The oil pump control module is electrically connected to the motor of the oil pump and, under the control of the main control module, outputs a drive current to the motor of the oil pump, causing the brake fluid in the new oil reservoir to enter the ring-shaped oil circuit through the inlet pipe and to be output from the ring-shaped oil circuit to the vehicle's braking system through the outlet pipe. The solenoid valve control module is electrically connected to the electronic pressure relief valve and, under the control of the main control module, outputs an on / off control signal to the electronic pressure relief valve, causing the oil pressure in the ring-shaped oil circuit to fluctuate according to a preset pattern.

2. The pulse-type brake fluid replacement device according to claim 1, characterized in that, The electronic pressure relief valve is switched on and off once every second under the control of the main control module and the solenoid valve control module.

3. The pulse-type brake fluid replacement device according to claim 2, characterized in that, The electronic pressure relief valve is activated for 0.05 to 0.95 seconds each time under the control of the main control module and the solenoid valve control module.

4. The pulse-type brake fluid replacement device according to any one of claims 1-3, characterized in that, The control unit includes an overcurrent protection module, which is electrically connected to the oil pump control module and outputs an overcurrent signal to the main control module when the output current of the oil pump control module is greater than a preset value.

5. The pulse-type brake fluid replacement device according to any one of claims 1-3, characterized in that, The control unit includes a digital tube display module, a digital tube driving circuit, buttons, and a button circuit. The button circuit and the digital tube driving circuit are electrically connected to the main control module, and the button circuit is triggered by the button to generate an input signal and transmit the input signal to the main control module. The digital tube driving circuit is electrically connected to the digital tube display module and drives the corresponding digital tube in the digital tube display module to emit light under the control of the main control module.

6. The pulse-type brake fluid replacement device according to any one of claims 1-3, characterized in that, The oil pipeline includes a first oil pipeline and a second oil pipeline. The first connector is a tee. The end of the inlet pipe, the beginning of the first oil pipeline, and the end of the second oil pipeline are respectively connected to the tee. The beginning of the inlet pipe is used to connect to a new oil container. The end of the first oil pipeline is connected to the inlet of the oil pump, and the beginning of the second oil pipeline is connected to the outlet of the electronic pressure relief valve.

7. The pulse-type brake fluid replacement device according to claim 6, characterized in that, The oil supply pipeline includes a third oil supply pipe and a fourth oil supply pipe. The second connector is a four-way connector. The first end of the oil outlet pipe, the end of the third oil supply pipe, and the first end of the fourth oil supply pipe are respectively connected to the four-way connector. The end of the oil outlet pipe is used to connect to the vehicle braking system. The first end of the third oil supply pipe is connected to the outlet of the oil pump, and the end of the fourth oil supply pipe is connected to the inlet of the electronic pressure relief valve.

8. The pulse-type brake fluid replacement device according to claim 7, characterized in that, A pressure gauge is also connected to the four-way valve.

9. The pulse-type brake fluid replacement device according to any one of claims 1-3, characterized in that, The oil pump motor is a DC motor, and the oil pump control module is composed of a DC motor drive circuit. The DC motor drive circuit generates a preset DC voltage according to the first PWM signal output by the main control module and outputs it to the DC motor.

10. The pulse-type brake fluid replacement device according to any one of claims 1-3, characterized in that, The electronic pressure relief valve includes an electromagnetic unit. The electromagnetic valve control module generates intermittent on-state and off-state voltages by using a second PWM signal from the main control module and outputs them to the electromagnetic unit.

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