CN113460019A - Method for monitoring temperature of brake disc in real time, storage medium and vehicle - Google Patents
Method for monitoring temperature of brake disc in real time, storage medium and vehicle Download PDFInfo
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- CN113460019A CN113460019A CN202010242342.XA CN202010242342A CN113460019A CN 113460019 A CN113460019 A CN 113460019A CN 202010242342 A CN202010242342 A CN 202010242342A CN 113460019 A CN113460019 A CN 113460019A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
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Abstract
The invention provides a method for monitoring the temperature of a brake disc in real time, a storage medium and a vehicle, wherein the method comprises the following steps: acquiring the temperature of the brake disc and the ambient temperature at the previous moment; calculating a first temperature difference between the brake disc temperature at the previous moment and the ambient temperature; if the first temperature difference is greater than a preset temperature difference threshold value and the brake pedal is not in a braking state, acquiring an average value of the vehicle speed in the monitoring period; calculating the heat dissipation temperature according to the brake disc temperature at the previous moment, the environment temperature, the vehicle speed average value and a heat dissipation calculation model; and obtaining the real-time temperature of the brake disc according to the heat dissipation temperature and the temperature of the brake disc at the previous moment. According to the method for monitoring the temperature of the brake disc in real time, the radiating temperature is calculated by using the temperature model, so that the temperature of the brake disc is monitored in real time, the cost can be saved, the measurement is simpler and more convenient, and the monitoring universality is improved.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a method for monitoring the temperature of a brake disc in real time, a computer storage medium and a vehicle.
Background
At present, the temperature of the brake disc is measured mainly by arranging a collecting device, for example, a sensor is additionally arranged on the brake disc to directly measure.
In some embodiments, the temperature of the brake disc is measured by attaching a measuring device to the brake disc, which comprises two brake disc pads 1, a thermocouple 2 and a data acquisition system, as shown in fig. 1. Two brake disc contact 1 and the inseparable laminating in brake disc surface, at two fixed thermocouple 2 respectively in the 1 backs of brake disc contact, utilize data acquisition system and record brake disc temperature measurement data through thermocouple 2.
However, in practical application, the temperature of the brake disc is measured by additionally arranging the device, so that the cost is increased, moreover, each vehicle is not suitable for additionally arranging the brake disc temperature detection device, the universality is low, and the development difficulty is increased.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a method for monitoring the temperature of a brake disc in real time, which can save cost and improve the versatility of monitoring the temperature of the brake disc.
A second object of the invention is to propose a computer storage medium.
A third object of the invention is to propose a vehicle.
In order to achieve the above object, a first embodiment of the present invention provides a method for monitoring a temperature of a brake disc in real time, where the method includes: acquiring the temperature of the brake disc and the ambient temperature at the previous moment; calculating a first temperature difference between the brake disc temperature at the previous moment and the ambient temperature; if the first temperature difference is greater than a preset temperature difference threshold value and the brake pedal is not in a braking state, acquiring an average value of the vehicle speed in the monitoring period; calculating the heat dissipation temperature according to the brake disc temperature at the previous moment, the environment temperature, the vehicle speed average value and a heat dissipation calculation model; and obtaining the real-time temperature of the brake disc according to the heat dissipation temperature and the temperature of the brake disc at the previous moment.
According to the method for monitoring the temperature of the brake disc in real time, based on the temperature model suitable for the vehicle, the temperature difference value between the temperature of the brake disc and the ambient temperature at the previous moment is larger than the preset temperature difference threshold value, and when the brake pedal is not in the braking state, the temperature model is used for calculating the heat dissipation temperature, so that the temperature of the brake disc is monitored in real time.
In some embodiments, the method further comprises: detecting a brake signal of the brake pedal; acquiring a vehicle speed value at the braking starting moment, a vehicle speed value at the braking ending moment and an environment temperature; calculating a temperature rise value of a brake disc according to the vehicle speed value at the braking starting moment, the vehicle speed value at the braking ending moment, the environment temperature and a temperature rise calculation model; and obtaining the brake disc temperature at the braking ending moment according to the brake disc temperature rising value and the brake disc temperature at the braking starting moment.
In some embodiments, the temperature rise calculation model satisfies the following equation:
wherein the content of the first and second substances,
wherein, Delta T' is the temperature rise value of the brake disc, v0Is the vehicle speed value at the initial moment of braking, v is the vehicle speed value at the end moment of braking, TeIs the ambient temperature, m is the vehicle mass, mpMass of a single brake disc, c is the specific heat capacity of the material, pdAs the density of the brake disc, cdSpecific heat capacity of brake disc, gammadFor brake disc thermal conductivity, ppIs the density of the friction block, cpIs the specific heat capacity of the friction block, gammapIs the friction block thermal conductivity.
In some embodiments, the heat dissipation temperature includes a convection heat dissipation temperature and a heat radiation heat dissipation temperature, and the calculating the heat dissipation temperature from the previous-time brake disc temperature, the ambient temperature, the vehicle speed average, and a heat dissipation calculation model includes: calculating the convection heat dissipation temperature according to the brake disc temperature at the previous moment, the environment temperature, the vehicle speed average value and a convection heat dissipation calculation model; and calculating the heat radiation temperature according to the brake disc temperature at the previous moment, the environment temperature and a heat radiation calculation model.
In some embodiments, the calculation model of convective heat dissipation satisfies the following formula:
wherein the content of the first and second substances,
wherein, TconvectionFor convective heat dissipation temperature, T is the temperature of the brake disc at the previous moment, TeIs the ambient temperature, A is the brake disc surface area, t is the monitoring cycle time, C is the material specific heat capacity, mpD is the outer diameter of the brake disc, theta is the air heat conduction coefficient, ReIs the Rayleigh coefficient, v is the vehicle speed average, ρairIs the air density and μ is the kinetic viscosity.
In some embodiments, the thermal radiation heat dissipation calculation model satisfies the following formula:
wherein, TradiFor heat radiation of heat radiation temperature, FeEmissivity, FgIs the Bohr constant, T is the brake disc temperature at the previous moment, TeIs the ambient temperature, A is the brake disc surface area, t is the monitoring cycle time, C is the material specific heat capacity, mpIs the total mass of the individual brake discs.
In some embodiments, the method further comprises: calculating a second temperature difference between the real-time temperature of the brake disc and the ambient temperature; and when the second temperature difference exceeds the alarm temperature difference threshold, sending a high-temperature alarm instruction, and activating an active hydraulic device to assist braking. Through the temperature of real-time supervision brake disc, when the brake disc temperature reached warning difference in temperature threshold value, hydraulic pressure through control hydraulic means made to have bigger hydraulic pressure force under the same brake pedal stroke, and then prevented because the not enough phenomenon of braking force that the heat fading phenomenon leads to.
In order to achieve the above object, a second aspect of the present invention provides a non-transitory computer storage medium having a computer program stored thereon, where the computer program is executed to implement the method for monitoring the temperature of a brake disc in real time as described in the above embodiments.
In order to achieve the above object, a third aspect embodiment of the invention proposes a vehicle including a brake system including a brake disc and a brake pedal; the environment temperature sensor is used for acquiring the environment temperature; the brake pedal sensor is used for acquiring a brake signal of the brake pedal; the vehicle speed sensor is used for acquiring a vehicle speed value; a memory storing a computer program; and the processor is connected with the environment temperature sensor, the brake pedal sensor, the vehicle speed sensor and the memory and is used for realizing the method for monitoring the temperature of the brake disc in real time in the embodiment when executing a computer program.
According to the vehicle provided by the embodiment of the invention, the temperature of the brake disc is calculated through the temperature calculation model, so that the real-time monitoring of the temperature of the brake disc is realized, compared with the vehicle additionally provided with a temperature measurement device, the vehicle is not required to be additionally provided with any sensor and device, the cost is lower, and the brake force can be prevented from being reduced due to heat fading caused by overhigh temperature of the brake disc through the real-time monitoring of the temperature of the brake disc, so that the safety of the vehicle cannot be ensured.
In some embodiments, the vehicle further comprises: the alarm device is connected with the processor and used for alarming according to the high-temperature alarm instruction; an active hydraulic device connected to the processor for increasing hydraulic pressure when activated to assist braking. When the temperature of the brake disc is monitored to be larger than a preset temperature threshold value, the alarm device gives an alarm, and the active hydraulic device is controlled to increase hydraulic pressure, so that the situation that the braking force is insufficient due to heat fading is prevented, and the driving safety of the vehicle is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic view of a prior art measuring device;
FIG. 2 is a flow diagram of a method of monitoring brake rotor temperature in real time according to one embodiment of the invention;
FIG. 3 is a flow chart of a method of monitoring brake rotor temperature in real time according to one embodiment of the present invention;
FIG. 4 is a flow chart of a method of monitoring brake rotor temperature in real time according to one embodiment of the present invention;
FIG. 5 is a block diagram of a vehicle according to one embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
During the running of the vehicle, the temperature of the brake disc is increased by braking each time. When the brake disc temperature is too high, the braking force decreases due to heat fading. For example, when braking is carried out on a continuous long downhill, the temperature of a brake disc can be increased sharply, and when braking is carried out again, the phenomenon of insufficient braking force can occur under the same hydraulic pressure, so that the safety cannot be guaranteed. Therefore, real-time monitoring of the brake disc temperature is necessary.
According to the method for monitoring the temperature of the brake disc in real time, disclosed by the embodiment of the invention, the real-time monitoring function of the temperature of the brake disc is realized through the established temperature model of the brake disc and a certain calculation method, and the establishment of the temperature model is firstly described below.
Wherein, when the vehicle is electrified and activated, the temperature of the brake disc is considered to be the same as the ambient temperature, and the temperature of the brake disc is increased every time the vehicle is braked in the running process, in the braking temperature rise process of the brake disc, the influence of heat dissipation is small, the braking time is relatively short, therefore, in an embodiment, the brake disc temperature may be obtained during braking based on a temperature-increasing model, and, in the non-braking state, the temperature of the brake disc gradually decreases, and in the heat dissipation state, the temperature of the brake disc can be obtained based on the heat dissipation model, so as to realize real-time monitoring of the temperature of the brake disc, wherein the real-time monitoring can be monitoring the temperature of the brake disc every other monitoring period, such as every second or every minute, and, because the braking time is short and the probability of braking is relatively low, the temperature of the brake disc at the moment before and after braking can be monitored in the braking state.
For the establishment of the temperature rise calculation model, specifically, the weight of the vehicle is different, the influence on the total energy during vehicle braking is great, and for safety, the calculation is performed by the weight of the full load of the vehicle. The total energy Q of the vehicle in linear motion can be expressed as:
wherein, the total energy is multiplied by a coefficient of 0.9 in consideration of the influence of wind resistance and heat generation of the tire and the ground.
The energy distributed into each brake disc when the vehicle is braking can be expressed as:
Qf＝Q·β/2、Qrq (1- β)/2; formula (2)
The temperature rise of a single disc of a vehicle brake disc, for example, taking a front disc as an example, the calculation of a rear disc is the same, and the temperature rise of the single disc can be expressed as:
wherein the content of the first and second substances,
the temperature rise calculation model can be obtained by conversion from the formula (1), the formula (2) and the formula (3) as follows:
wherein, Delta T' is the temperature rise value of the brake disc, v0Is the vehicle speed value at the initial moment of braking, v is the vehicle speed value at the end moment of braking, TeIs the ambient temperature, m is the vehicle mass, mpMass of a single brake disc, c is the specific heat capacity of the material, pdAs the density of the brake disc, cdSpecific heat capacity of brake disc, gammadFor brake disc thermal conductivity, ppIs the density of the friction block, cpIs the specific heat capacity of the friction block, gammapIs the friction block thermal conductivity.
In the embodiment, the convection heat dissipation calculation model and the heat radiation heat dissipation model are established in consideration of the convection heat dissipation and the heat radiation heat dissipation.
The main problem of convection heat dissipation is that the convection heat transfer coefficient changes with the change of the vehicle speed, and the convection heat dissipation is also related to the temperature difference.
For the establishment of the convection heat dissipation calculation model, firstly, the following heat exchange coefficients are asked for help:
wherein the content of the first and second substances,
further, the convective heat dissipation can be expressed as:
the convective heat dissipation temperature can be expressed as:
wherein, TconvectionFor convective heat dissipation temperature, T is the temperature of the brake disc at the previous moment, TeIs the ambient temperature, A is the brake disc surface area, t is the monitoring cycle time, C is the material specific heat capacity, mpD is the outer diameter of the brake disc, theta is the air heat conduction coefficient, ReIs the Rayleigh coefficient, v is the vehicle speed average, ρairIs the air density and μ is the kinetic viscosity.
For the establishment of the heat radiation heat dissipation calculation model, the heat radiation heat dissipation capacity can be expressed as:
Qradi＝Fe·Fg·A·(T4-Te4) T; formula (8)
According to thermodynamic calculation, a heat radiation calculation formula can be obtained as follows:
wherein, TrddiFor heat radiation of heat radiation temperature, FeEmissivity, FgIs the Bohr constant, T is the brake disc temperature at the previous moment, TeIs the ambient temperature, A is the brake disc surface area, t is the monitoring cycle time, C is the material specific heat capacity, mpIs the total mass of the individual brake discs.
And (3) introducing vehicle fixed parameters related in the temperature calculation formula, such as the outer diameter of a brake disc, the mass of the brake disc, the weight of the vehicle, the specific heat capacity of the material, the heat conductivity of the material, the surface area of the brake disc and the front-rear braking force distribution ratio, into the temperature calculation formula, such as formula (4), formula (7) and formula (9), so as to establish a brake disc temperature calculation model suitable for the vehicle, wherein the brake disc temperature calculation model comprises a heating calculation model and a heat dissipation calculation model, the heating calculation model and the heat dissipation calculation model are stored in a processor, and the heating calculation model and the heat dissipation calculation model are called when the temperature of the brake disc is monitored subsequently.
Based on the brake disc temperature model of the above embodiment, a method for monitoring the brake disc temperature in real time according to an embodiment of the first aspect of the invention is described below with reference to fig. 2-4.
As shown in fig. 2, the method for monitoring the temperature of the brake disc in real time according to the embodiment of the present invention at least includes steps S1-S5, which are described in detail below.
And step S1, acquiring the brake disc temperature and the ambient temperature at the previous moment.
Wherein, can gather ambient temperature through vehicle self temperature sensor to give the treater with ambient temperature transmission, and the treater record has the brake disc temperature of the moment in the past.
In step S2, a first temperature difference between the brake disc temperature and the ambient temperature at the previous time is calculated.
Specifically, the difference between the temperature of the brake disc and the ambient temperature at the previous moment indicates that heat dissipation exists, that is, the temperature of the brake disc is in a heat dissipation state, for example, after braking.
And step S3, if the first temperature difference is larger than a preset temperature difference threshold value and the brake pedal is not in a braking state, acquiring an average value of the vehicle speed in the monitoring period.
For example, the monitoring period is set to 1 second, i.e. the brake disc temperature is monitored every 1 second, and the first temperature difference is, for example, Δ T, when Δ T>At 0, calculate the average value of vehicle speed within 1s, e.g. as V3。
And step S4, calculating the heat dissipation temperature according to the brake disc temperature, the environment temperature, the vehicle speed average value and the heat dissipation calculation model at the previous moment.
Specifically, in the non-braking state, due to convection and heat radiation, the temperature of the brake disc is gradually reduced, namely the brake disc is in a heat dissipation state, and then the first temperature difference delta T and the average value V of the vehicle speed are calculated3And the ambient temperature TeAnd (4) bringing the heat dissipation temperature into a heat dissipation calculation model, and calculating to obtain the heat dissipation temperature.
In an embodiment, the heat dissipation temperature comprises a convection heat dissipation temperature and a heat radiation heat dissipation temperature, and the convection heat dissipation temperature is calculated according to the brake disc temperature, the ambient temperature, the vehicle speed average value and a convection heat dissipation calculation model at the previous moment; and calculating the heat radiation temperature according to the temperature of the brake disc at the previous moment, the ambient temperature and the heat radiation calculation model.
E.g. the previous oneThe temperature difference delta T between the brake disc temperature and the environment temperature is T-TeIf Δ T>0, calculating the heat dissipation temperature of the brake disc every 1s, including convection heat dissipation and radiation heat dissipation, specifically, taking the average value V3 of the vehicle speed within 1s, and substituting the delta T and V3 into ReFormula, calculating the Ralo coefficient ReWhen R is calculated ase≤2.4×105And Re>2.4×105Two cases of (1) give the convection heat dissipation QconvectionAnd heat radiation heat dissipation capacity QradiAnd further calculate the heat dissipation temperature TconvectionAnd TradiI.e., into equations (7) and (9), the convective heat dissipation temperature and the thermal radiation heat dissipation temperature are obtained based on the heat dissipation calculation model.
And step S5, obtaining the real-time temperature of the brake disc according to the heat dissipation temperature and the temperature of the brake disc at the previous moment.
Specifically, when the first temperature difference value Δ T>0, and the brake pedal is in an unbraked state, calculating the real-time temperature T of the brake disc every 1s, wherein the real-time temperature T of the brake disc is the temperature T of the brake disc at the previous moment1Subtracting the heat dissipation temperature, in the running process of the vehicle, the temperature of the brake disc can be increased by braking the vehicle each time, and the heat dissipation quantity of the brake disc can be ignored compared with the heating quantity at the moment, so that when the vehicle is in a braking state, the heat dissipation calculation is stopped.
For example, when the temperature difference Δ T>0, and the vehicle is not in a braking state, and the real-time brake disc temperature T is calculated every 1s, namely T1-Tconvection-TradiTemperature difference Δ T ═ T-TeAnd if the vehicle is in a braking state, stopping heat dissipation calculation.
According to the method for monitoring the temperature of the brake disc in real time, based on the temperature model suitable for the vehicle, the temperature difference value between the temperature of the brake disc and the ambient temperature at the previous moment is larger than the preset temperature difference threshold value, and when the brake pedal is not in the braking state, the temperature model is used for calculating the heat dissipation temperature, so that the temperature of the brake disc is monitored in real time.
In some embodiments, the method of monitoring brake rotor temperature in real time further comprises: detecting a brake signal of a brake pedal; acquiring a vehicle speed value at the braking starting moment, a vehicle speed value at the braking ending moment and an environment temperature; calculating a temperature rise value of a brake disc according to the vehicle speed value at the braking starting moment, the vehicle speed value at the braking ending moment, the environment temperature and a temperature rise calculation model; and obtaining the brake disc temperature at the braking ending moment according to the brake disc temperature rising value and the brake disc temperature at the braking starting moment.
Specifically, the method includes monitoring the state of a brake pedal in real time during the movement of a vehicle, namely monitoring a CAN (Controller Area Network) signal of the brake pedal, recording a vehicle speed value at the time of pressing, namely a vehicle speed value at the starting time of braking, such as V1, when the brake pedal is detected to be in the state of pressing, continuing to detect, recording a vehicle speed value at the time of releasing, namely a vehicle speed value at the ending time of braking, such as V2, when the brake pedal is detected to be released, acquiring the current environment temperature, substituting the vehicle speed value V1 at the starting time of braking, the vehicle speed value V2 at the ending time of braking of the vehicle and the environment temperature into a temperature-raising calculation model, such as the formula (4) above, calculating to obtain a brake disc temperature-raising value, such as Δ T', further calculating a difference value between the brake disc temperature at the starting time of braking and the brake disc temperature-raising value, and acquiring the brake disc temperature at the ending time of braking, wherein the brake disc temperature at the starting time of braking CAN be the brake disc temperature at the moment before the starting time of braking, and after braking is finished, the temperature of the brake disc is higher than the ambient temperature, heat dissipation is started, namely the temperature of the brake disc is monitored in real time based on the heat dissipation model, and at the moment, the obtained temperature of the brake disc at the braking finishing moment is the temperature of the brake disc at the moment before the heat dissipation starting calculation moment.
In some embodiments, the method of monitoring brake rotor temperature in real time further comprises: calculating a second temperature difference between the real-time temperature of the brake disc and the ambient temperature; and when the second temperature difference exceeds the alarm temperature difference threshold, sending a high-temperature alarm instruction, and activating an active hydraulic device to assist braking. The brake disc temperature is monitored in real time, and if the brake disc temperature reaches a set critical point such as an alarm temperature difference threshold value during braking, hydraulic pressure force of a hydraulic device can be controlled, so that larger hydraulic pressure force is provided under the same brake pedal stroke, and the phenomenon of insufficient braking force caused by the heat fading phenomenon is prevented.
Fig. 3 is a flowchart of a method for monitoring a temperature of a brake disc in real time according to an embodiment of the present invention, which specifically includes the following steps.
In step S21, the vehicles are matched.
And step S22, detecting the vehicle state, performing temperature rise calculation based on the temperature rise calculation model when a braking signal is detected, increasing the temperature of the brake disc after braking is finished, wherein the temperature difference exists between the temperature of the brake disc and the ambient temperature, and the brake disc performs heat dissipation, and then performing temperature drop calculation based on the heat dissipation calculation model and monitoring the real-time temperature of the brake disc. This process is a cyclic detection process.
And step S23, monitoring the real-time temperature of the brake disc.
Step S24, if the second temperature difference exceeds the warning temperature difference threshold, a high temperature warning command is sent, for example, to warn on an instrument panel, if the vehicle is in a braking state, an ESP (Electronic Stability Program) is notified to increase corresponding auxiliary power, and in a parking state, hydraulic pressure is increased.
Outputting a temperature value every 1s in the non-braking state as the calculation of the next initial temperature, stopping the heat dissipation calculation when Δ T is 0, Δ T may represent the second temperature difference, and it is difficult to ensure that Δ T is exactly equal to 0 due to the actual calculated value. Therefore, a brake disc alarm temperature threshold value T can be setwaringWhen the second temperature difference reaches the alarm temperature line, the driver is reminded and the active hydraulic device such as the ESP is activated, and the driver is noticed to increase the hydraulic pressure properly during braking to prevent the insufficient braking force phenomenon due to heat fading.
The following describes a process of monitoring the temperature of the brake disc in real time according to an embodiment of the present invention with reference to fig. 4, and as shown in fig. 4, the process is a flowchart of the process of monitoring the temperature of the brake disc in real time according to the embodiment of the present invention, where the process includes a temperature rise calculation and a heat dissipation calculation, and the conditions of the real-time temperature of the brake disc and an alarm temperature are monitored, and the process specifically includes the following steps.
In step S31, vehicle basic parameters are input.
And step S32, establishing a brake disc temperature model comprising a heating model and a heat dissipation model.
In step S33, depression of the brake pedal is detected.
In step S34, the vehicle speed value V1 at the braking start time is recorded. .
In step S35, release of the brake pedal is detected.
In step S36, the vehicle speed value V2 at the brake end time is recorded.
Step S37, substituting V1 and V2 into the heating model to calculate the temperature rise value T +
The steps S33-S37 are a braking temperature rise calculation process, and the following steps are a process of radiating heat and monitoring the temperature of the brake disc in real time.
And step S38, outputting the brake disc temperature.
In step S39, the ambient temperature Te is acquired.
Step S40, calculating a first temperature difference between the brake disc temperature and the ambient temperature, and determining whether the first temperature difference satisfies Δ T >0, if yes, performing step S41, otherwise, performing step S44.
And step S41, acquiring the vehicle speed average value V3 in the monitoring period.
And step S42, substituting the parameters into a heat dissipation calculation model to calculate the temperature drop value T-, and outputting the temperature of the brake disc.
And step S43, judging whether the temperature of the brake disc is higher than the alarm temperature threshold value, if so, executing step S45, and if not, executing step S40.
Step S44 ends the calculation.
Step S45, alarm and activate the active hydraulic device.
In summary, according to the method for monitoring the temperature of the brake disc in real time provided by the embodiment of the invention, the temperature model suitable for the vehicle is established, the temperature difference value between the temperature of the brake disc and the ambient temperature at the previous moment is greater than the preset temperature difference threshold value, and when the brake pedal is not in the braking state, the temperature model is used for calculating the heat dissipation temperature, so that the temperature of the brake disc is monitored in real time. And the temperature of the brake disc is monitored in real time, so that the situation that the brake force is reduced due to heat fading caused by overhigh temperature of the brake disc can be avoided, and the safety of a vehicle cannot be guaranteed.
The computer-readable storage medium of the embodiment of the second aspect of the present invention has a computer program stored thereon, and the computer program is used for executing any one of the above-mentioned methods for monitoring the temperature of the brake disc in real time.
A vehicle according to an embodiment of the third aspect of the invention is described below with reference to the drawings.
Fig. 5 is a block diagram of a vehicle according to an embodiment of the present invention, and as shown in fig. 5, a vehicle 10 of an embodiment of the present invention includes a brake system 11, an ambient temperature sensor 12, a brake pedal sensor 13, a vehicle speed sensor 14, a memory 15, and a processor 17.
Wherein, the brake system 11 comprises a brake disc and a brake pedal; the ambient temperature sensor 12 is used for acquiring ambient temperature; the brake pedal sensor 13 is used for acquiring a brake signal of a brake pedal; the vehicle speed sensor 14 is used for acquiring a vehicle speed value; a memory 15 in which a computer program is stored; the processor 16 is connected to the ambient temperature sensor 12, the brake pedal sensor 13, the vehicle speed sensor 14 and the memory 15, and is used for implementing the method for monitoring the temperature of the brake disc in real time as mentioned in the above embodiment when executing a computer program.
According to the vehicle 10 provided by the embodiment of the invention, the temperature of the brake disc is calculated through the temperature calculation model, so that the real-time monitoring of the temperature of the brake disc is realized, compared with the vehicle with the temperature measurement equipment, the vehicle 10 is low in cost without adding any sensor or device, and the braking force reduction caused by heat fading due to overhigh temperature of the brake disc can be avoided through the real-time monitoring of the temperature of the brake disc, so that the safety of the vehicle cannot be guaranteed.
In some embodiments, the vehicle 10 further includes: the alarm device 17 is connected with the processor 16 and is used for giving an alarm according to a high-temperature alarm instruction; an active hydraulic device 18 is connected to the processor 16 for increasing hydraulic pressure when activated to assist braking. Through the temperature of real-time supervision brake disc, when the brake disc temperature reached alarm device 17's difference in temperature threshold value, make the same brake pedal stroke have bigger hydraulic pressure force down through the hydraulic pressure force of control initiative hydraulic means 18, and then prevent the not enough phenomenon of braking force because the heat fading phenomenon leads to.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A method of monitoring brake disc temperature in real time, comprising:
acquiring the temperature of the brake disc and the ambient temperature at the previous moment;
calculating a first temperature difference between the brake disc temperature at the previous moment and the ambient temperature;
if the first temperature difference is greater than a preset temperature difference threshold value and the brake pedal is not in a braking state, acquiring an average value of the vehicle speed in the monitoring period;
calculating the heat dissipation temperature according to the brake disc temperature at the previous moment, the environment temperature, the vehicle speed average value and a heat dissipation calculation model;
and obtaining the real-time temperature of the brake disc according to the heat dissipation temperature and the temperature of the brake disc at the previous moment.
2. The method of monitoring brake disc temperature in real time of claim 1, further comprising:
detecting a brake signal of the brake pedal;
acquiring a vehicle speed value at the braking starting moment, a vehicle speed value at the braking ending moment and an environment temperature;
calculating a temperature rise value of a brake disc according to the vehicle speed value at the braking starting moment, the vehicle speed value at the braking ending moment, the environment temperature and a temperature rise calculation model;
and obtaining the brake disc temperature at the braking ending moment according to the brake disc temperature rising value and the brake disc temperature at the braking starting moment.
3. The method of real-time monitoring of brake disc temperature according to claim 2, wherein the temperature rise calculation model satisfies the following equation:
wherein the content of the first and second substances,
wherein, Delta T' is the temperature rise value of the brake disc, v0Is the vehicle speed value at the initial moment of braking, v is the vehicle speed value at the end moment of braking, TeIs the ambient temperature, m is the vehicle mass, mpMass of a single brake disc, c is the specific heat capacity of the material, pdAs the density of the brake disc, cdSpecific heat capacity of brake disc, gammadFor brake disc thermal conductivity, ppIs the density of the friction block, cpIs the specific heat capacity of the friction block, gammapIs the friction block thermal conductivity.
4. The method of claim 1, wherein the heat dissipation temperature includes a convective heat dissipation temperature and a radiative heat dissipation temperature, and the calculating the heat dissipation temperature from the previous time brake disc temperature, the ambient temperature, the vehicle speed average, and a heat dissipation calculation model comprises:
calculating the convection heat dissipation temperature according to the brake disc temperature at the previous moment, the environment temperature, the vehicle speed average value and a convection heat dissipation calculation model; and
and calculating the heat radiation temperature according to the brake disc temperature at the previous moment, the environment temperature and a heat radiation calculation model.
5. The method of real-time monitoring of brake disc temperature of claim 4, wherein the convective heat dissipation calculation model satisfies the following equation:
wherein the content of the first and second substances,
wherein, TconvectionFor convective heat dissipation temperature, T is the temperature of the brake disc at the previous moment, TeIs the ambient temperature, A is the brake disc surface area, t is the monitoring cycle time, C is the material specific heat capacity, mpD is the outer diameter of the brake disc, theta is the air heat conduction coefficient, ReIs the Rayleigh coefficient, v is the vehicle speed average, ρairIs the air density and μ is the kinetic viscosity.
6. The method of real-time monitoring of brake disc temperature according to claim 4, wherein the thermal radiation heat dissipation calculation model satisfies the following formula:
wherein, TradiFor heat radiation of heat radiation temperature, FeEmissivity, FgIs the Bohr constant, T is the brake disc temperature at the previous moment, TeIs the ambient temperature, A is the brake disc surface area, t is the monitoring cycle time, C is the material specific heat capacity, mpIs the total mass of the individual brake discs.
7. The method of real-time monitoring of brake disc temperature according to claim 1 or 2, further comprising:
calculating a second temperature difference between the real-time temperature of the brake disc and the ambient temperature;
and when the second temperature difference exceeds the alarm temperature difference threshold, sending a high-temperature alarm instruction, and activating an active hydraulic device to assist braking.
8. A non-transitory computer storage medium having a computer program stored thereon, wherein the computer program when executed implements the method of monitoring brake rotor temperature in real time of any one of claims 1-7.
9. A vehicle, characterized by comprising:
the brake system comprises a brake disc and a brake pedal;
the environment temperature sensor is used for acquiring the environment temperature;
the brake pedal sensor is used for acquiring a brake signal of the brake pedal;
the vehicle speed sensor is used for acquiring a vehicle speed value;
a memory storing a computer program;
a processor connected to the ambient temperature sensor, the brake pedal sensor, the vehicle speed sensor and the memory, for implementing the method of real-time monitoring of brake disc temperature according to any one of claims 1 to 7 when executing the computer program.
10. The vehicle of claim 9, further comprising:
the alarm device is connected with the processor and used for alarming according to the high-temperature alarm instruction;
an active hydraulic device connected to the processor for increasing hydraulic pressure when activated to assist braking.
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| CN115163708A (en) * | 2022-06-21 | 2022-10-11 | 东风柳州汽车有限公司 | Real-time detection method and device for temperature of brake disc |
| CN117574692A (en) * | 2024-01-17 | 2024-02-20 | 中国第一汽车股份有限公司 | Method, system, equipment and storage medium for calculating temperature of vehicle brake disc |
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