Brake fluid heating control device of brake system

Abstract

The invention provides a brake fluid heating control device of a brake system, which comprises a test computer for receiving, reading and storing a brake control system signal, a vehicle-mounted signal and a sensor signal and controlling the temperature of a heating device; a heating device; the adapter is used for converting a control signal of a test computer into a current signal so as to control the heating module; the relay is used for overload protection; the switch is used for controlling the on-off of the heating module; the heating module is used for heating brake fluid; the temperature module is used for detecting the temperature of brake fluid of a main cylinder; the brake fluid detector is used for detecting the water content in brake fluid; the sensor module comprises a wheel cylinder temperature module and a wheel cylinder pressure module; the data acquisition equipment is used for acquiring signals and transmitting the signals to the test computer; the heat insulation device is used for insulating heat generated by the heating device; the power supply module supplies power to the device; and the wire harness is used for connecting the modules to realize signal and power transmission.

Description

TECHNICAL FIELD

[0001] The application relates to a heating control device, in particular to a brake fluid heating control device of a brake system. BACKGROUND

[0002] The functional stability and safety of a vehicle brake system are of great importance, especially the thermal stability performance under extreme working conditions. During long-time continuous braking (such as continuous downhill in mountainous areas), the brake fluid is heated due to frequent friction, and the temperature rises sharply, which may cause local boiling of the brake fluid, generate bubbles, and further cause the brake pedal stroke to become longer, the brake response to be delayed, and even the brake force to be reduced, which will seriously affect the vehicle braking safety.

[0003] To solve such problems, various auxiliary thermal management functions have been introduced in electronic brake control systems (such as ESC, one box, EHB, etc.), and the system monitors the driving conditions and calculates the thermal load state of the brake system, and actively intervenes in braking when it is judged that the brake fluid is overheated. To ensure the reliability of these thermal decay monitoring and compensation functions, they must be fully verified during development.

[0004] At present, the mainstream test method in the industry relies on real vehicle mountain road durability test, that is, by repeatedly performing long-distance downhill braking on a typical slope road section, the thermal accumulation process of the brake system is simulated, and the corresponding monitoring and compensation functions are developed and parameter calibrated. However, this type of test method has the following significant problems:

[0005] High development cost: mountain road test requires a large number of test vehicles and personnel;

[0006] Long test cycle: a single thermal accumulation process takes several hours, and the transportation and test preparation of the vehicle also require a large amount of time resources, making it difficult to achieve rapid iteration;

[0007] High safety risk: extreme thermal working condition test is carried out under real road conditions, which has the risk of brake failure causing traffic accidents.

[0008] Although some laboratories attempt to use bench simulation to test thermal working conditions, existing bench systems mostly focus on thermal simulation of mechanical components (such as brake discs and pads), lack the ability to actively and accurately control the brake fluid temperature rise process and bubble generation behavior at the vehicle level, and cannot truly reproduce the hydraulic fluctuations and pedal characteristic changes caused by liquid boiling.

[0009] Therefore, there is an urgent need for a test device that can reproduce brake fluid overheating working conditions in a flat test environment to support the efficient development and verification of electronic brake control system thermal management functions. The existing technology has obvious shortcomings in simulating brake fluid thermal decay working conditions, and it is difficult to balance the authenticity, safety and economy of the test. SUMMARY

[0010] The present application aims to solve the problems of high development cost, long test period and high safety risk caused by relying on mountainous area real vehicle test to verify the heat decay monitoring and compensation function of the electronic brake control system under the working condition of brake fluid overheating in the prior art. At the same time, overcome the technical defects that the existing laboratory bench system cannot actively and accurately reproduce the brake fluid temperature rise, boiling and the resulting hydraulic fluctuation and pedal characteristic change at the vehicle level.

[0011] To solve the above technical problems, the present application provides a brake system brake fluid heating control device, comprising:

[0012] A test computer is used to receive, read and save brake control system signals, vehicle on-board signals and sensor signals, and control the temperature of the heating device.

[0013] A heating device comprises an adapter, a relay, a switch, a heating module, a temperature module and a brake fluid detector. The adapter is used to convert the control signal of the test computer into a current signal to control the heating module. The relay is used for overload protection. The switch is used to control the on-off of the heating module. The heating module is used to heat the brake fluid. The temperature module is used to detect the temperature of the master cylinder brake fluid. The brake fluid detector is used to detect the water content in the brake fluid.

[0014] A sensor module comprises a wheel cylinder temperature module and a wheel cylinder pressure module, which are respectively used to detect the temperature and pressure of the wheel cylinder brake fluid and transmit signals to a data acquisition device.

[0015] A data acquisition device is used to collect sensor module signals, vehicle signals and heating device signals, and transmit them to the test computer.

[0016] A heat insulation device is used to isolate the heat generated by the heating device and protect the surrounding vehicle parts.

[0017] A power module supplies power to the heating device, sensor module and data acquisition device.

[0018] A wire harness is used to connect each module to realize signal and power transmission.

[0019] The heating module comprises a main cavity and a secondary cavity. The main cavity is provided with a brake hard pipe connecting port, a bleeder bolt hole and a sensor mounting hole. An electric heating plug is arranged on the secondary cavity. The electric heating plug transmits heat to the secondary cavity, and the secondary cavity heats the brake fluid.

[0020] The number of electric heating plugs is 4, which are symmetrically arranged on the secondary cavity.

[0021] The temperature module is integrated on the main cavity of the heating module, and is used for monitoring the temperature of the main cylinder brake fluid in real time; the test computer controls the heating device in a closed loop by comparing the signals of the temperature module and the wheel cylinder temperature module.

[0022] The brake fluid detector comprises a brake fluid detection sensor and a display instrument, and is used for detecting and digitally displaying the water content of the brake fluid in real time.

[0023] The data acquisition device is also used for adjusting and calibrating the parameters of the thermal management function through the special software on the test computer when the vehicle is installed with the calibratable test sample of the brake controller.

[0024] The heat insulation device is arranged around the heating device in the foot space area of the passenger in the front seat.

[0025] The power module is a 12V power supply.

[0026] The wire harness adopts a TTP / C or FlexRay communication protocol.

[0027] The test method based on the above device comprises the following steps:

[0028] S1) install and connect each device, and perform heat insulation treatment by using the heat insulation device;

[0029] S2) replace the original brake fluid with standard brake fluid with a specific water content, and remove the air bubbles in the brake system through the air release bolt;

[0030] S3) turn on the power supply, the data acquisition device and the heating device, set the control temperature range through the test computer, activate the heating device when the temperature is lower than the set lower limit, and deactivate the heating device when the temperature exceeds the set upper limit, perform closed loop control by comparing the signals of the heating device temperature module and the wheel cylinder temperature sensor, and repeatedly deep press the brake pedal until the temperature of the wheel cylinder brake fluid reaches the target value;

[0031] S4) disconnect the heating device, start testing and recording data, and evaluate the electronic brake control function; after the test is completed, turn off the heating device, cool the vehicle and disassemble the device.

[0032] Advantages of the present application

[0033] 1. Improve test safety and economy: by actively and controllably heating the brake fluid in a flat laboratory environment, the heat accumulation condition generated by long downhill braking on a mountain road is equivalent to be reproduced, and the traffic safety risk of real vehicle mountain test is completely avoided, and the vehicle, personnel and time cost is greatly reduced.

[0034] 2. Ensuring Test Accuracy and Authenticity: Dual-path monitoring and closed-loop control via an integrated temperature sensor in the heating module and a separate wheel cylinder temperature sensor enable precise control of the brake fluid temperature. Combined with brake fluid water content detection and pressure monitoring, the physical process of brake fluid boiling and bubble formation, leading to increased pedal travel and brake force fade, can be accurately reproduced, ensuring reliable and authentic test results.

[0035] 3. Achieve efficient development and calibration: The device can be integrated with vehicles equipped with calibrable test samples. Through data acquisition equipment and test computer software, the parameters of the thermal management function can be directly adjusted and calibrated online, supporting rapid iterative development of functions and significantly shortening the R&D cycle.

[0036] 4. Excellent versatility and expandability: This device is suitable for testing all vehicle models that use hydraulic braking systems. Its active heating and precision temperature control principles can also be extended to other fields that require temperature regulation and testing of the working medium of hydraulic transmission systems.

[0037] Figure Labels

[0038] Test computer-1;

[0039] Heating device-2;

[0040] Sensor Module-3;

[0041] Data acquisition device-4;

[0042] Insulation device-5;

[0043] Power module-6. Attached Figure Description

[0044] Figure 1 This is a structural block diagram of a brake fluid heating control device for a braking system according to this application;

[0045] Figure 2 This is the flowchart of the method used in this application. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the invention 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 for illustrative purposes only and are not intended to limit the invention.

[0047] This invention provides a brake fluid heating control device for a braking system, comprising:

[0048] Test computer 1 is used to receive, read, and save braking control system signals, vehicle on-board signals, and sensor signals, and to control the temperature of the heating device;

[0049] Heating device 2 includes an adapter, a relay, a switch, a heating module, a temperature module, and a brake fluid detector; the adapter is used to convert the control signal of the test computer into a current signal to control the heating module; the relay is used for overload protection; the switch is used to control the on / off state of the heating module; the heating module is used to heat the brake fluid; the temperature module is used to detect the brake fluid temperature in the master cylinder; and the brake fluid detector is used to detect the water content in the brake fluid.

[0050] Sensor module 3 includes a wheel cylinder temperature module and a wheel cylinder pressure module, which are used to detect the temperature and pressure of the brake fluid in the wheel cylinder, and transmit the signals to the data acquisition device.

[0051] Data acquisition device 4 is used to acquire signals from sensor module 3, vehicle signals and heating device 2, and transmit them to test computer 1;

[0052] Heat insulation device 5 is used to isolate the heat generated by heating device 2 and protect surrounding vehicle components;

[0053] Power module 6 provides power to the heating device 2, sensor module 3 and data acquisition device 4;

[0054] Wiring harnesses are used to connect various modules to enable the transmission of signals and power.

[0055] The heating module includes a main cavity and a secondary cavity. The main cavity is provided with a brake hard pipe connection port, a bleed bolt hole and a sensor mounting hole. The secondary cavity is provided with a glow plug, which transfers heat to the secondary cavity, thereby heating the brake fluid.

[0056] The number of glow plugs is four, symmetrically arranged on the secondary cavity.

[0057] The temperature module is integrated into the main cavity of the heating module and is used to monitor the brake fluid temperature of the master cylinder in real time. The test computer 1 performs closed-loop control of the heating device 2 by comparing the signals from the temperature module and the wheel cylinder temperature module.

[0058] The brake fluid detector includes a brake fluid detection sensor and a display instrument, which is used to detect and digitally display the water content of the brake fluid in real time.

[0059] The data acquisition device 4 is also used to adjust and calibrate the parameters of the thermal management function through dedicated software on the test computer 1 when a calibrable test sample of the brake controller is installed on the vehicle.

[0060] The heat insulation device 5 is arranged around the heating device 2 in the footwell area of ​​the front passenger.

[0061] The power module 6 is a 12V power supply.

[0062] The wiring harness uses the TTP / C or FlexRay communication protocol.

[0063] The test method based on the above device, such as Figure 2 As shown, it includes the following steps:

[0064] S1) Install and connect the various devices, and use the heat insulation device 5 for heat insulation treatment;

[0065] S2) Replace the original brake fluid with standard brake fluid with a specific water content and remove air bubbles from the brake system using the bleed screw.

[0066] S3) Turn on the power supply, data acquisition device 4 and heating device 2. Set the control temperature range through the test computer 1. When the temperature is lower than the set lower limit, activate the heating device 2. When the temperature exceeds the set upper limit, deactivate the heating device 2. Perform closed-loop control by comparing the temperature module of the heating device 2 with the wheel cylinder temperature sensor signal. Repeatedly press the brake pedal until the wheel cylinder brake fluid temperature reaches the target value.

[0067] S4) Disconnect heating device 2, start testing and record data to evaluate the electronic brake control function; after the test is completed, turn off heating device 2, cool the vehicle and disassemble the equipment.

[0068] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0069] Please see Figure 1 , Figure 1 This is a structural block diagram of a brake fluid heating control device for a braking system provided in an embodiment of this application.

[0070] The brake fluid heating control device in this embodiment is used to actively heat the brake fluid in a flat test environment, equivalently replicating the brake fluid heat accumulation process under harsh conditions such as long-term downhill driving, to verify the heat fade monitoring and compensation function of the electronic brake control system (such as ESC). Figure 1 As shown, the device mainly includes: a test computer 1, a heating device 2, a sensor module 3, a data acquisition device 4, a heat insulation device 5, a power supply module 6, and wiring harnesses connecting each module (not shown in the figure).

[0071] Test computer 1 serves as the core of control and data processing for the entire device, and is connected to data acquisition device 4 and heating device 2 via wiring harness. Test computer 1 has built-in dedicated software to perform the following core functions: (1) receiving, reading and storing various signals from the vehicle braking control system, vehicle network and sensor module 3 through data acquisition device 4; (2) sending control commands to heating device 2 according to preset temperature control logic (such as setting temperature range) and real-time acquired brake fluid temperature signals to realize closed-loop control of its heating process.

[0072] Heating device 2 is the direct component responsible for heating the brake fluid and monitoring critical parameters. For example... Figure 1 As shown, it is connected to the test computer 1, data acquisition device 4, and power module 6 via wiring harnesses, obtaining operating power from the power module 6 and being controlled by the program of the test computer 1. The heating device 2 is an integrated functional unit, specifically including: an adapter, relay, switch, heating module, temperature module, and brake fluid detector (each sub-component is located in...). Figure 1 (Seen in the overall block diagram). The adapter converts the control signals from the test computer 1 into current signals that can drive the heating module; the relay acts as an overload protection device; the switch controls the on / off state of the heating circuit; the heating module contains a cavity and glow plugs for directly heating the brake fluid flowing through it; the temperature module integrated into the heating module measures the brake fluid temperature at the master cylinder in real time; and the brake fluid detector monitors the water content in the brake fluid in real time. The heating device 2 uploads the collected master cylinder brake fluid temperature and water content signals to the test computer 1 via the data acquisition device 4.

[0073] Sensor module 3 is used to monitor key state parameters at the wheel ends of the braking system. For example... Figure 1 As shown, it is connected to the data acquisition device 4 and the power module 6 via a wiring harness. The sensor module 3 further includes a wheel cylinder temperature module 31 and a wheel cylinder pressure module 32. The wheel cylinder temperature module 31 is used to detect the temperature of the brake fluid in the wheel cylinder, and is typically composed of a temperature sensor and a matching signal conversion circuit (e.g., a Vector VX1135 measurement hardware) to convert the analog temperature signal into a digital signal. The wheel cylinder pressure module 32 is used to detect the brake pressure in the wheel cylinder, and is also composed of a pressure sensor and a signal conversion circuit. All converted digital signals are sent to the data acquisition device 4.

[0074] Data acquisition device 4 serves as the information hub of the entire device, connected to sensor module 3, heating device 2, vehicle network, power module 6, and test computer 1 via wiring harnesses. Its main functions are: (1) to collect and convert various signals from sensor module 3 (wheel cylinder temperature, pressure) and heating device 2 (master cylinder temperature, water content); (2) to directly obtain braking control system and vehicle status signals from the vehicle bus; and (3) to transmit all collected signals to test computer 1 for processing and storage. In addition, if the vehicle under test is equipped with a calibrable test sample of the brake controller, the parameters of the heat fade monitoring and compensation function can be adjusted and calibrated online via data acquisition device 4 through dedicated software on test computer 1.

[0075] The heat insulation device 5 is arranged around the heating device 2 (for example, when the heating device 2 is arranged in the passenger footwell). Its function is to block the heat generated by the heating device 2 during operation, protect the surrounding vehicle wiring harness, interior parts and other components from high temperatures, and ensure the safety of the testing process.

[0076] The power module 6 provides a stable power supply for the aforementioned power-consuming modules (heating device 2, sensor module 3, data acquisition device 4, etc.). In this embodiment, the power module 6 typically uses an on-board 12V DC power supply and supplies power to multiple devices through a power distribution box and wiring harness.

[0077] The wiring harness is a cable assembly that connects the test computer 1, heating device 2, sensor module 3, data acquisition device 4, and power module 6, forming the physical channel for power transmission and signal interaction within the device. Depending on actual communication requirements, a dedicated wiring harness based on vehicle communication protocols such as CAN (TTP / C) or FlexRay can be selected.

[0078] The embodiments described above are merely further illustrations of the present invention and are not intended to limit the present invention in any other way. The present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding modifications and changes based on the present invention, but all such modifications and changes should fall within the protection scope of the present invention.

Claims

1. A brake fluid heating control device for a brake system, characterized by, The application relates to a test device for testing the heat management function of a brake control system, comprising the following parts: a test computer for receiving, reading, storing brake control system signals, vehicle signals and sensor signals and controlling the temperature of a heating device; a heating device comprising an adapter, a relay, a switch, a heating module, a temperature module and a brake fluid detector; the adapter is used for converting the control signals of the test computer into current signals to control the heating module; the relay is used for overload protection; the switch is used for controlling the on-off of the heating module; the heating module is used for heating brake fluid; the temperature module is used for detecting the temperature of the brake fluid of a master cylinder; the brake fluid detector is used for detecting the water content in the brake fluid; a sensor module comprising a wheel cylinder temperature module and a wheel cylinder pressure module, which are respectively used for detecting the temperature and pressure of the brake fluid of a wheel cylinder and transmitting signals to a data acquisition device; the data acquisition device is used for collecting sensor module signals, vehicle signals and heating device signals and transmitting the signals to the test computer; a heat insulation device for insulating the heat generated by the heating device and protecting the surrounding vehicle parts; a power module for supplying power to the heating device, the sensor module and the data acquisition device; and a wire harness for connecting the modules to realize signal and power transmission. The heating module comprises a main cavity and a secondary cavity, the main cavity is provided with a brake hard pipe connecting port, a bleeder bolt hole and a sensor mounting hole, and an electric heating plug is arranged on the secondary cavity; the electric heating plug transmits heat to the secondary cavity, and the secondary cavity heats the brake fluid. The number of the electric heating plugs is four, and the electric heating plugs are symmetrically arranged on the secondary cavity. The temperature module is integrated on the main cavity of the heating module and is used for monitoring the temperature of the brake fluid of the master cylinder in real time; the test computer controls the heating device in a closed loop mode by comparing the signals of the temperature module and the wheel cylinder temperature module. The brake fluid detector comprises a brake fluid detection sensor and a display instrument and is used for detecting and digitally displaying the water content in the brake fluid in real time. The data acquisition device is also used for adjusting and calibrating the parameters of the heat management function through special software on the test computer when a calibratable test sample of a vehicle provided with a brake controller is installed. The heat insulation device is arranged around the heating device in the foot space area of the front passenger. The power module is a 12V power supply.

2. The brake fluid heating control device of claim 1, wherein The wire harness adopts a TTP / C or FlexRay communication protocol.

3. The brake fluid heating control device of claim 2, wherein The application further comprises the following steps:

4. The brake fluid heating control device of claim 1, wherein S1) installing and connecting the devices and carrying out heat insulation treatment through the heat insulation device; 5. The brake fluid heating control device of claim 1, wherein S2) replacing the original vehicle brake fluid with standard brake fluid with a specific water content and removing bubbles in the brake system through a bleeder bolt; 6. The brake fluid heating control device of claim 1, wherein S3) turning on the power supply, the data acquisition device and the heating device, setting the control temperature range through the test computer, activating the heating device when the temperature is lower than the set lower limit, stopping the heating device when the temperature exceeds the set upper limit, controlling in a closed loop mode by comparing the signals of the heating device temperature module and the wheel cylinder temperature sensor, repeatedly stepping on the brake pedal until the temperature of the brake fluid of the wheel cylinder reaches a target value; 7. The brake fluid heating control device of claim 1, wherein S4) disconnecting the heating device, starting to test and record data and evaluating the electronic brake control function; after the test is completed, the heating device is turned off, the vehicle is cooled and the devices are dismounted.

8. The brake fluid heating control device of claim 1, wherein ​ 9. The brake fluid heating control device of claim 1, wherein ​ 10. A test method for a brake fluid heating control device using the brake system according to any one of claims 1 to 9, characterized by, ​ ​ ​ ​ ​

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