Commercial vehicle non-contact brake drum temperature sensor

Abstract

The invention discloses a commercial vehicle non-contact brake drum temperature sensor, which comprises a temperature measurement module, a control module and an early warning module, and is characterized in that the temperature measurement module is used for receiving an infrared wavelength signal generated by a brake drum during thermal motion in real time and transmitting the infrared wavelength signal to the control module; and the control module calculates the surface temperature and the temperature rise rate of the brake drum at the current time according to the received infrared wavelength signal, compares the surface temperature and the temperature rise rate with preset values, and controls the early warning module to give an alarm if the calculated surface temperature and the temperature rise rate of the brake drum at the current time exceed the preset values. The surface temperature and temperature rise rate data of the brake drum are monitored and calculated on line in real time according to the infrared radiation principle, the measurement accuracy is high, the real-time performance is good, the measurement range is wide, when the measured temperature or temperature rise rate exceeds a preset value, a driver is prompted through the early warning module so as to be reminded to check a vehicle, and the safety of the vehicle is improved. And the driving and personal safety is ensured.

Description

Technical Field

[0001] The present invention relates to the field of vehicle monitoring. More specifically, the present invention relates to a non-contact brake drum temperature sensor for commercial vehicles. Background Art

[0002] The working conditions of traditional commercial trucks with long distances and long mileage mean that their braking frequencies are much higher than those of ordinary passenger cars. Therefore, the wear of their braking mechanisms is also faster. So most trucks adopt drum brake systems to achieve vehicle braking. The drum brake has a simple structure, is easy to repair, and has a low cost. In addition, in heavy-duty working conditions, the drum brake can provide a larger friction area, and its braking force and braking effect are stronger. Therefore, the drum brake is widely used in large trucks. However, due to its closed structure, the heat of the drum brake cannot be quickly dissipated during long-term braking, and it accumulates in the cavity, resulting in a sharp rise in temperature, which reduces the braking deceleration effect and is extremely likely to induce traffic accidents, affecting driving and personal safety. To ensure driving safety, usually, the ABS system internally estimates the temperature of the brake drum through a model, but the temperature data obtained by this method has low accuracy and cannot truly ensure driving safety. Summary of the Invention

[0003] Another object of the present invention is to provide a non-contact brake drum temperature sensor for commercial vehicles that can be used to monitor, calculate the surface temperature and heating rate data of the brake drum in real time during driving, has high measurement accuracy, good real-time performance, a wide measurement range, and can ensure driving safety.

[0004] To achieve these and other advantages in accordance with the present invention, there is provided a non-contact brake drum temperature sensor for commercial vehicles, including a temperature measurement module, a control module, and an early warning module. The temperature measurement module and the control module are arranged above the brake drum. The control module is electrically connected to the temperature measurement module, and the early warning module is electrically connected to the control module. The temperature measurement module is used to receive the infrared wavelength signal generated by the brake drum during thermal movement in real time and transmit the infrared wavelength signal to the control module. The control module calculates the surface temperature and temperature rise rate of the brake drum at the current time based on the received infrared wavelength signal, and compares them with preset values. If the calculated surface temperature and temperature rise rate of the brake drum at the current time exceed the preset values, the control module controls the early warning module to issue an alarm.

[0005] Preferably, the control module is also electrically connected to the bus brake system of the vehicle. When the control module determines that the surface temperature and temperature rise rate of the brake drum at the current time exceed the preset values, the bus brake system controls the water spraying mechanism to cool down the brake drum.

[0006] Preferably, the control module includes a data receiving module and a data processing module that perform data interaction with each other. The data receiving module is used to receive the infrared wavelength signal obtained by the temperature measurement module, and the preset value is stored in the data processing module. The data processing module calculates the surface temperature and temperature rise rate of the brake drum at the current time based on the received infrared wavelength signal, and compares them with the preset value.

[0007] Preferably, after the data processing module performs first-order low-pass filtering and amplitude-limiting filtering on the received infrared wavelength signal, it then calculates the surface temperature and temperature rise rate of the brake drum at the current time.

[0008] Preferably, it further includes a self-checking module that performs data interaction with the data processing module and the warning module. An error threshold is set in the self-checking module. The self-checking module is used to calculate in real time the difference between the temperature rise rate of the brake drum surface at the current time and the previous time calculated by the data processing module. If the compared difference exceeds the error threshold, the self-checking module controls the warning module to issue an alarm.

[0009] Preferably, if the calculated surface temperature and temperature rise rate of the brake drum at the current time exceed the preset value, the warning module issues an alarm in the form of a heat warning signal; if the difference between the temperature rise rate of the brake drum surface at the current time and the previous time exceeds the error threshold, the warning module issues an alarm in the form of signal abnormality.

[0010] Preferably, it further includes a statistics module that is electrically connected to the warning module. The statistics module is used to count the number of heat warning signals issued by the warning module.

[0011] The present invention has at least the following beneficial effects: The present invention monitors, calculates the surface temperature and temperature rise rate data of the brake drum in real time and online through the infrared radiation principle, with high measurement accuracy, good real-time performance, wide measurement range. And when the measured temperature or temperature rise rate exceeds the preset value, it also prompts the driver through the warning module to remind the driver to check the vehicle, ensuring driving and personal safety; the surface temperature of the brake drum can reach up to hundreds of degrees Celsius during emergency braking. The non-contact brake drum temperature sensor for commercial vehicles is arranged above the brake drum, avoiding the situation that the measurement module and control module cannot withstand the high temperature and high pressure environment caused by the contact between the non-contact brake drum temperature sensor for commercial vehicles and the brake drum, resulting in damage, burning or even explosion. At the same time, the non-contact brake drum temperature sensor for commercial vehicles is installed outside the brake drum, improving the convenience of module signal transmission, wire taking and power supply, with easy installation, high matching degree, long service life, high precision and wide application range, and can be applied to the temperature monitoring of any commercial vehicle brake drum mechanism.

[0012] Other advantages, objects, and features of the present invention will be partly shown by the following description, and partly will be understood by those skilled in the art through the research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The circuit connection block diagram of a commercial non-contact brake drum temperature sensor according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The present invention will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement it according to the description in the specification.

[0015] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0016] As Figure 1 shown, the present invention provides a commercial vehicle non-contact brake drum temperature sensor, including a temperature measurement module, a control module, and an early warning module. The temperature measurement module and the control module are arranged above the brake drum. The control module is electrically connected to the temperature measurement module, and the early warning module is electrically connected to the control module; The temperature measurement module is used to receive the infrared wavelength signal generated by the brake drum during thermal movement in real time and transmit the infrared wavelength signal to the control module; the control module calculates the surface temperature and temperature rise rate of the brake drum at the current time according to the received infrared wavelength signal, and compares it with a preset value. If the calculated surface temperature and temperature rise rate of the brake drum at the current time exceed the preset value, the control early warning module issues an alarm.

[0017] In the above technical solution, as Figure 1As shown in the figure, the temperature measurement module is an infrared chip, and the control module is an MCU; the infrared chip and the control module are integrated on a PCB board, and the PCB board is installed above the brake drum. When the brake drum undergoes thermal movement, it continuously radiates infrared rays with a wavelength band of 0.75 - 100 μm in all directions. The infrared chip uses the infrared radiation principle to periodically collect infrared wavelength signals and transmits the wavelength value to the control module through IIC digital communication. The control module calculates the surface temperature and temperature rise rate of the brake drum at the current time per unit time. The control module stores preset values of the surface temperature and the heating rate. When the control module monitors that the calculated surface temperature or temperature rise rate exceeds the preset value, it issues an alarm through the warning module; the warning module can remind the driver by displaying a heat warning signal on the dashboard, thus ensuring driving safety; the present invention monitors, calculates the surface temperature and temperature rise rate data of the brake drum in real time and online through the infrared radiation principle, with high measurement accuracy, good real-time performance, a wide measurement range, and when the measured temperature or temperature rise rate exceeds the preset value, it also prompts the driver through the warning module to remind the driver to check the vehicle, ensuring driving and personal safety; the surface temperature of the brake drum can reach hundreds of degrees Celsius during emergency braking. The non-contact brake drum temperature sensor for commercial vehicles is set above the brake drum, avoiding the situation where the measurement module and the control module cannot withstand the high temperature and high pressure environment due to the contact between the non-contact brake drum temperature sensor for commercial vehicles and the brake drum, resulting in damage, burnout, or even explosion. At the same time, the non-contact brake drum temperature sensor for commercial vehicles is installed outside the brake drum, improving the convenience of module signal transmission, wire taking, and power supply, being easy to install, having a high matching degree, a long service life, high accuracy, and a wide application range, and can be applicable to the temperature monitoring of any commercial vehicle brake drum mechanism.

[0018] In another technical solution, the control module is also electrically connected to the bus brake system of the vehicle. When the control module determines that the surface temperature and temperature rise rate of the brake drum at the current time exceed the preset value, the bus brake system controls the water spraying mechanism to cool down the brake drum.

[0019] In this technical solution, the control module publishes the temperature data and the temperature rise rate to the vehicle bus brake system for interpretation through CAN communication. The total brake system accurately controls the water spraying mechanism to cool down the brake drum by mastering the temperature and temperature rise rate information, so as to further ensure driving safety.

[0020] In another technical solution, the control module includes a data receiving module and a data processing module that interact with each other for data. The data receiving module is used to receive the infrared wavelength signal obtained by the temperature measurement module, and the preset value is stored in the data processing module. The data processing module calculates the surface temperature and temperature rise rate of the brake drum at the current time according to the received infrared wavelength signal and compares it with the preset value.

[0021] In another technical solution, after the data processing module performs first-order low-pass filtering and amplitude-limiting filtering on the received infrared wavelength signal, it then calculates the surface temperature and heating rate of the brake drum at the current time.

[0022] In this technical solution, during the operation of the vehicle, vibrations will occur, and the vibrations will cause fluctuations of different amplitudes in the infrared wavelength signals collected by the temperature measurement module. These distorted signals will cause calculation errors. Therefore, the data processing module first performs first-order low-pass filtering and amplitude-limiting filtering on the received infrared wavelength signal to remove the signal spikes and jitters, and then calculates the temperature data and heating rate, which can ensure the accuracy of the calculated data and the accuracy of the non-contact brake drum temperature sensor monitoring of commercial vehicles.

[0023] In another technical solution, it further includes a self-check module that conducts data interaction with the data processing module and the warning module. An error threshold is set in the self-check module. The self-check module is used to calculate in real time the difference between the surface temperature rise rate of the brake drum at the current time and the previous time calculated by the data processing module. If the compared difference exceeds the error threshold, the self-check module controls the warning module to issue an alarm.

[0024] In this technical solution, affected by the harsh driving environment of commercial vehicles, during the operation of the vehicle, there may be sediment or other particulate matter blocking the sensing area of the temperature measurement module, resulting in distortion of the collected infrared wavelength signal. Therefore, through the data interaction between the self-check module, the data processing module, and the warning module, the self-check module identifies whether there are illegal values in the data collected by the temperature measurement module. If there are illegal values, it notifies the warning module to issue an alarm to remind the driver to get off the vehicle to check the sensor. The warning module can remind the driver by displaying a signal anomaly on the dashboard.

[0025] In another technical solution, if the calculated surface temperature and heating rate of the brake drum at the current time exceed the preset value, the warning module issues an alarm in the form of a heat warning signal; if the difference between the surface temperature rise rate of the brake drum at the current time and the previous time exceeds the error threshold, the warning module issues an alarm in the form of a signal anomaly. By adopting two different alarm forms, it is convenient for the driver to distinguish the types of alarms.

[0026] In another technical solution, it further includes a statistics module, which is electrically connected to the warning module. The statistics module is used to count the number of heat warning signals issued by the warning module.

[0027] In this technical solution, the infrared chip includes rich EEPROM peripherals. The statistical module can be an EEPROM peripheral. When the brake drum temperature or the temperature rise rate reaches a preset value, the control module controls the statistical module to accumulate the number of times of each warning message. Based on the characteristic that the EEPROM power-off data is not lost, when the number of abnormal times accumulates to a set threshold, the control module will report the brake drum life information through the CAN bus to prompt the driver to maintain or replace the brake drum.

[0028] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated and described examples here.

Claims

1. A non-contact brake drum temperature sensor for commercial vehicles, characterized in that it includes a temperature measurement module, a control module and an early warning module. The temperature measurement module and the control module are arranged above the brake drum. The control module is electrically connected to the temperature measurement module, and the early warning module is electrically connected to the control module; The temperature measurement module is used to receive the infrared wavelength signal generated by the brake drum during thermal movement in real time and transmit the infrared wavelength signal to the control module; the control module calculates the surface temperature and temperature rise rate of the brake drum at the current time according to the received infrared wavelength signal, and compares them with the preset values. If the calculated surface temperature and temperature rise rate of the brake drum at the current time exceed the preset values, the control early warning module issues an alarm.

2. The non-contact brake drum temperature sensor for commercial vehicles according to claim 1, characterized in that, The control module is also electrically connected to the vehicle's bus brake system. When the control module determines that the surface temperature and temperature rise rate of the brake drum at the current time exceed the preset values, the bus brake system controls the water spraying mechanism to cool down the brake drum.

3. The non-contact brake drum temperature sensor for commercial vehicles according to claim 1, wherein, The control module includes a data receiving module and a data processing module that interact with each other for data. The data receiving module is used to receive the infrared wavelength signal obtained by the temperature measurement module. The preset values are stored in the data processing module. The data processing module calculates the surface temperature and temperature rise rate of the brake drum at the current time according to the received infrared wavelength signal, and compares them with the preset values.

4. The non-contact brake drum temperature sensor for commercial vehicles according to claim 3, characterized in that, After the data processing module performs first-order low-pass filtering and limiting filtering on the received infrared wavelength signal, it calculates the surface temperature and heating rate of the brake drum at the current time.

5. The non-contact brake drum temperature sensor for commercial vehicles according to claim 3, characterized in that It also includes a self-checking module that interacts with the data processing module and the early warning module. An error threshold is set in the self-checking module. The self-checking module is used to calculate the difference between the surface temperature rise rate of the brake drum at the current time and the previous time calculated by the data processing module in real time. If the compared difference exceeds the error threshold, the self-checking module controls the early warning module to issue an alarm.

6. The non-contact brake drum temperature sensor for commercial vehicles according to claim 5, characterized in that, If the calculated surface temperature and temperature rise rate of the brake drum at the current time exceed the preset values, the early warning module issues an alarm in the form of a thermal warning signal; if the difference between the surface temperature rise rate of the brake drum at the current time and the previous time exceeds the error threshold, the early warning module issues an alarm in the form of signal abnormality.

7. The non-contact brake drum temperature sensor for commercial vehicles according to claim 6, characterized in that, It also includes a statistics module, which is electrically connected to the early warning module. The statistics module is used to count the number of thermal warning signals issued by the early warning module.

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