CN111376709A - Vehicle heat dissipation control method and system - Google Patents
Vehicle heat dissipation control method and system Download PDFInfo
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- CN111376709A CN111376709A CN201811626685.5A CN201811626685A CN111376709A CN 111376709 A CN111376709 A CN 111376709A CN 201811626685 A CN201811626685 A CN 201811626685A CN 111376709 A CN111376709 A CN 111376709A
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- cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K11/00—Arrangement in connection with cooling of propulsion units
- B60K11/02—Arrangement in connection with cooling of propulsion units with liquid cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- General Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
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- Air-Conditioning For Vehicles (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Abstract
The invention relates to the technical field of vehicle heat dissipation, and provides a vehicle heat dissipation control method and a vehicle heat dissipation control system, wherein the vehicle heat dissipation control method comprises the following steps: detecting the temperature, the temperature change rate and the vehicle running speed of a vehicle heating component; determining a target cooling importance corresponding to the detected temperature and the temperature change rate, wherein the cooling importance indicates the importance of cooling the heat generating component of the vehicle; determining a corresponding cooling request level based on the detected temperature, the temperature change rate and the determined target cooling importance; and controlling the heat dissipation component to perform heat dissipation action of corresponding heat dissipation amplitude based on the detected vehicle running speed and the determined cooling request grade, wherein the heat dissipation amplitude is in positive correlation with the vehicle running speed and the cooling request grade. Therefore, the risk that heating components are burnt due to untimely temperature reduction caused by too fast temperature rise in high-speed running is avoided, and the safe heat management of important heating components in the heat dissipation control process of the vehicle is guaranteed.
Description
Technical Field
The invention relates to the technical field of vehicle heat dissipation, in particular to a vehicle heat dissipation control method and system.
Background
At present, the vehicle mainly drives a heat dissipation component arranged in the vehicle, such as a water pump, so as to realize heat dissipation management on the vehicle, and the function of the vehicle is to enable a power component, a power component and a control component to work within a limit working temperature range designed by a component supplier, so that a passenger compartment meets the comfort requirement and the energy consumption of a heat management component of the whole vehicle is optimal.
At present, some related technologies propose to control the rotation speed of the water pump directly according to the temperature and the temperature change rate so as to realize the balance control between energy conservation and temperature control. However, the inventor of the present application finds that at least the following technical problems exist in the related art at present in the process of practicing the present application: if the whole vehicle runs, even if the temperature is low, the temperature rise of the vehicle is changed quickly in the running process, so that the temperature rise is too fast to be reduced, and when the temperature or the temperature rise is detected to reach a certain threshold value, the temperature reduction measure is taken, so that the parts are burnt out; in addition, the importance degree of different vehicle heating components is different, for example, the vehicle-mounted charger and the motor controller are both vehicle heating components, the safety of the vehicle is not affected by the overheating failure of the vehicle-mounted charger, and the safe operation and driving of the vehicle may be affected by the overheating failure of the motor controller.
Disclosure of Invention
In view of the above, the present invention is directed to a heat dissipation control method, so as to at least solve the problems in the related art that a temperature reduction measure is only taken according to a temperature or a temperature rise, so that the temperature rise is too fast during a driving process, so that the temperature reduction is not timely, and a heat dissipation operation cannot be individually performed according to an important degree of a heat generating component of a vehicle, so that the safety of the important heat generating component is low.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a vehicle heat dissipation control method, wherein the vehicle heat dissipation control method comprises: detecting the temperature, the temperature change rate and the vehicle running speed of a vehicle heating component; determining a target cooling importance corresponding to the detected temperature and the temperature change rate, wherein the cooling importance indicates the importance of cooling the heat generating component of the vehicle; determining a corresponding cooling request level based on the detected temperature, the temperature change rate and the determined target cooling importance; controlling the heat dissipation component to perform a heat dissipation action of a corresponding heat dissipation magnitude based on the detected vehicle running speed and the determined cooling request level, wherein the heat dissipation magnitude has a positive correlation with the vehicle running speed and the cooling request level.
Further, the heat dissipation components include a first heat dissipation component and a second heat dissipation component, wherein the control of the heat dissipation components to perform the heat dissipation actions of the corresponding heat dissipation amplitudes includes: controlling the first heat dissipation part and the second heat dissipation part to operate so as to perform a heat dissipation action corresponding to a first heat dissipation amplitude; or controlling the first heat dissipation part or the second heat dissipation part to operate so as to perform a heat dissipation action corresponding to a second heat dissipation amplitude, wherein the first heat dissipation amplitude is greater than the second heat dissipation amplitude.
Further, the heat dissipation part includes a PWM heat dissipation part, wherein the controlling the heat dissipation part to perform a heat dissipation action of a corresponding heat dissipation magnitude based on the detected vehicle driving speed and the determined cooling request level includes: and adjusting the duty ratio of the PWM heat dissipation part based on the detected vehicle running speed and the determined cooling request grade so as to control the heat dissipation part to perform heat dissipation action with corresponding heat dissipation amplitude.
Further, the controlling the heat dissipation component to perform the heat dissipation action of the corresponding heat dissipation magnitude based on the detected vehicle driving speed and the determined cooling request level includes: when the cooling request level is smaller than a preset first temperature and cold threshold value, comparing the vehicle running speed with the preset first speed threshold value; when the comparison result indicates that the vehicle running speed is smaller than a preset first speed threshold value, the duty ratio of the PWM heat dissipation component is adjusted to be a first duty ratio; and when the comparison result indicates that the vehicle running speed is greater than or equal to the first speed threshold value, adjusting the duty ratio of the PWM heat dissipation component to be a second duty ratio, wherein the first duty ratio is smaller than the second duty ratio.
Further, the heat generating components include a dc converter, a motor control unit, an in-vehicle charger, a motor, and a coolant, wherein the detecting the temperature, the temperature change rate, and the vehicle running speed of the heat generating components of the vehicle includes: detecting temperatures and rates of temperature change of different vehicle heat generating components under different vehicle operating conditions for determining respective levels of cooling requests, comprising: when the vehicle is in a driving working condition, detecting the temperature and the temperature change rate of the direct current converter, the motor control unit, the motor and the cooling liquid; when the vehicle is in a slow charging working condition, detecting the temperature and the temperature change rate of the direct current converter, the vehicle-mounted charger and the cooling liquid; and when the vehicle is in a fast charging working condition, detecting the temperature and the temperature change rate of the direct current converter and the cooling liquid.
Further, the detected heat generating components of the vehicle are plural, wherein the determining the target cooling importance corresponding to the detected temperature and the temperature change rate includes: determining a plurality of corresponding calibrated cooling importance degrees according to a plurality of detected vehicle heat generating components, wherein each vehicle heat generating component corresponds to different calibrated cooling importance degrees respectively; and calculating the determined multiple calibration cooling importance degrees by a linear interpolation method to obtain the target cooling importance degrees corresponding to the detected temperature and the temperature change rate.
Further, the determining a corresponding cooling request level based on the detected temperature, the temperature change rate, and the determined target cooling importance includes: determining an approximate temperature and an approximate temperature change rate matching the detected temperature and temperature change rate in the cooling request reference table, wherein the cooling request reference table includes pre-calibrated relationships among the temperature, the temperature change rate, and the cooling request level; and calculating the corresponding cooling request grade based on the cooling request grades corresponding to the target cooling importance degree, the approximate temperature and the approximate temperature change rate.
Further, the heat sink member includes one or more of: water pump, single-gear fan, multi-gear fan, and PWM fan.
Compared with the prior art, the vehicle heat dissipation control method has the following advantages:
in the vehicle heat dissipation control method, the temperature change rate and the cooling importance of the heating component are detected, so that the corresponding target cooling request grade is determined, and the heat dissipation action of the heat dissipation amplitude in positive correlation is controlled to be executed by the heat dissipation component through the driving speed and the target cooling request grade. Therefore, the vehicle speed is also considered in addition to the temperature and the temperature change rate of the heating component in the heat dissipation process, heat dissipation treatment is carried out even if the temperature is lower and the running speed is higher, and the risk that the heating component is burnt due to untimely temperature reduction caused by too fast running temperature rise can be avoided; furthermore, the important degree of the heating components needing to be cooled is considered in the process of vehicle heat dissipation control, and the safe heat management of the important heating components in the process of vehicle heat dissipation control is guaranteed.
Another objective of the present invention is to provide a vehicle heat dissipation control system, so as to at least solve the problems in the related art that the temperature is too fast due to the temperature rise being too fast when the vehicle is running because the temperature reduction measure is only taken according to the temperature or the temperature rise, and the safety of the important heat generating components is low because the heat dissipation operation cannot be individually performed according to the importance of the heat generating components of the vehicle.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a vehicle heat dissipation control system, wherein the vehicle heat dissipation control system comprises: a detection unit for detecting a temperature, a temperature change rate, and a vehicle running speed of a heat generating component of a vehicle; a target cooling importance determining unit for determining a target cooling importance corresponding to the detected temperature and the temperature change rate; a cooling request level determination unit for determining a corresponding cooling request level based on the detected temperature, the temperature change rate, and the determined target cooling importance level; a heat dissipation control unit for controlling the heat dissipation component to perform a heat dissipation action of a corresponding heat dissipation magnitude based on the detected vehicle running speed and the determined cooling request level, wherein the heat dissipation magnitude has a positive correlation with the vehicle running speed and the cooling request level.
Further, the heat dissipation component comprises a PWM heat dissipation component, wherein the heat dissipation control unit is further configured to adjust a duty ratio of the PWM heat dissipation component based on the detected vehicle driving speed and the determined cooling request level, so as to control the heat dissipation component to perform a heat dissipation action with a corresponding heat dissipation amplitude.
Compared with the prior art, the vehicle heat dissipation control system and the vehicle heat dissipation control method have the same advantages, and are not repeated herein.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a method for controlling heat dissipation in a vehicle according to an embodiment of the present invention;
fig. 2 is a flowchart of regulating and controlling the heat dissipation amplitude by controlling the duty ratio of the pulse signal in the vehicle heat dissipation control method according to an embodiment of the present invention;
FIG. 3 is a flow chart of a vehicle heat dissipation control method according to another embodiment of the present invention;
fig. 4 is a block diagram of a vehicle heat dissipation control system according to an embodiment of the present invention.
Description of reference numerals:
detection unit of 40-vehicle heat dissipation control system 401
402 target cooling importance determination unit 404 heat dissipation control unit
403 cooling request level determination unit
Detailed Description
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1, a vehicle heat dissipation control method according to an embodiment of the present invention includes:
and S11, detecting the temperature, the temperature change rate and the vehicle running speed of the heat generating components of the vehicle.
The execution main body of the method according to the embodiment of the present invention may be various types of processors or controllers, and it may be implemented by additionally installing a processor on the Vehicle, and it may also be implemented by modifying the hardware or software configuration of a controller originally equipped in the Vehicle, such as a VCU (Vehicle Control Unit), and all of them are within the scope of the present invention. In addition, as to the type of the vehicle in the embodiment of the present invention, it may be a new energy vehicle or a conventional fuel vehicle, and all fall within the scope of the present invention.
It should be noted that the type of the heat generating component of the vehicle is not limited herein, and may be any component capable of generating heat in the vehicle, for example, a motor in a new energy vehicle, a DC/DC (direct current converter), a cooling pipe loop, an IGBT (Insulated Gate Bipolar Transistor), a motor, an engine, or the like.
Specifically, the detected temperature and temperature change rate of the heat generating component may also be real-time temperature indicating of a single heat generating component, and may also be temperature or temperature change rate indicating of a plurality of heat generating components, for example, the heat generating component may include a DC converter DC/DC, a Motor Control Unit (MCU), an On-board charger (OBC), a motor, a coolant, and the like. As an example, it may be that the temperature of the heat generating component is detected in a temperature detection period by calling a temperature sensor, and then the corresponding temperature change rate is determined according to the change of the detected temperature of the heat generating component in different temperature detection periods.
S12, determining a corresponding target cooling request level based on the detected temperature and the temperature change rate.
Among them, the target cooling request level may be a magnitude indicating an amount of cooling application for cooling down a heat generating component in an automobile, for example, when the temperature is too high and/or the temperature rises too fast, a large amount of cooling application should be given to the heat generating component.
In some embodiments, when there are multiple heat generating components in the vehicle, the temperatures and temperature change rates of the different heat generating components of the vehicle may be detected under different vehicle operating conditions for determining the corresponding target cooling request levels, for example, the temperatures and temperature change rates of the dc converter, the motor control unit, the motor, and the cooling liquid are detected when the vehicle is in a driving condition; when the vehicle is in a slow charging working condition, detecting the temperature and the temperature change rate of the direct current converter, the vehicle-mounted charger and the cooling liquid; when the vehicle is in a fast charging working condition, the temperature and the temperature change rate of the direct current converter and the cooling liquid are detected. Therefore, the temperatures of the corresponding heating components are respectively and specifically detected according to different working conditions of the vehicle, and the corresponding target cooling request grades are determined according to the temperatures, so that the determined target cooling request grades can meet the heat dissipation individualized requirements of different working conditions.
In some embodiments, the target cooling request level may also be determined by referencing a table in conjunction with pre-calibrated cooling requests. Specifically, it may be a step of querying a pre-calibrated cooling request reference table including pre-calibrated relationships among the temperatures, the temperature change rates, and the calibrated cooling request levels based on the detected temperatures and the temperature change rates to determine the corresponding target cooling request levels. Therefore, by applying the cooling request reference table including the above three-coefficient relationship, in the case where the temperature and the temperature change rate are detected, the corresponding target cooling request level can be specified. It should be noted that, regarding the relationship between the temperature, the temperature change rate and the calibrated cooling request level in the cooling request reference table, the form thereof should not be limited herein, and for example, it may be a calibrated point mapping relationship, a statistical function rule relationship, and the like.
And S13, controlling the heat dissipation component to perform heat dissipation action of corresponding heat dissipation amplitude based on the detected vehicle running speed and the determined target cooling request level, wherein the heat dissipation amplitude is in positive correlation with the vehicle running speed and the target cooling request level.
When the vehicle running speed is higher or the target cooling request level is higher, the heat dissipation amplitude of the heat dissipation action performed by the heat dissipation component is controlled to be larger, so that the vehicle running speed is considered when the heat dissipation component is controlled to perform the heat dissipation operation; in addition, under the condition of the same target cooling request level, when the vehicle runs at a higher speed, the corresponding heat dissipation amplitude is increased, so that a large amount of heat dissipation and temperature reduction operations are started in advance before the temperature or the temperature rise is detected to be increased to the warning range when the vehicle runs at a high speed, the heat management protection of the heat generating components is realized, and the risk that the heat generating components are burnt out is reduced.
Description of the positive correlation: on the one hand, when the vehicle running speed and/or the target cooling request level only need to be increased, the heat dissipation amplitude of the controlled heat dissipation component is correspondingly increased; on the other hand, when the vehicle running speed and/or the target cooling request level increase and exceed the preset critical point, the heat dissipation amplitude of the controlled heat dissipation component correspondingly increases, so that the stepwise increase is realized; the above embodiments are all within the scope of the present invention.
In some embodiments, there are a plurality of heat sink members in the vehicle, such as a first heat sink member, a second member, and a third heat sink member, and so forth. When the heat dissipation action corresponding to the heat dissipation amplitude is controlled, the heat dissipation action can be implemented by controlling the start and stop of different heat dissipation components, for example, by controlling the first heat dissipation component and the second heat dissipation component to operate simultaneously to perform the heat dissipation action corresponding to the first heat dissipation amplitude (or large heat dissipation amplitude), or by controlling the first heat dissipation component or the second heat dissipation component to operate alone to perform the heat dissipation action corresponding to the second heat dissipation amplitude (or small heat dissipation amplitude), wherein the first heat dissipation amplitude is greater than the second heat dissipation amplitude.
Regarding the type of the heat dissipation member of the embodiment of the present invention, it may also be various heat dissipation members for vehicles, which should not be limited herein, for example, it may be one or more of the following: a water pump, a single-gear fan, a multi-gear fan, and a PWM (Pulse Width Modulation) fan. It can be understood that the water pump and the PWM fan belong to the PWM heat sink, and both can control the heat sink of the PWM heat sink by controlling the duty ratio of the driving pulse signal. Specifically, it may be that, based on the detected vehicle running speed and the determined target cooling request level, the duty ratio of the pulse signal for driving the PWM heat dissipation component is adjusted to control the PWM heat dissipation component to perform a heat dissipation action of a corresponding heat dissipation magnitude, for example: when the duty ratio of the pulse signal is large, the corresponding heat dissipation amplitude is high; when the duty ratio of the pulse signal is small, the corresponding heat dissipation amplitude is low.
As shown in fig. 2, a process of regulating and controlling a heat dissipation amplitude by controlling a duty ratio of a pulse signal in a vehicle heat dissipation control method according to an embodiment of the present invention includes:
and S21, when the target cooling request level is smaller than the preset temperature and cold level threshold value, comparing the vehicle running speed with the preset speed threshold value, and judging whether the vehicle running speed is smaller than the preset speed threshold value.
The temperature level threshold may be a low or medium temperature indicating that the heat generating component is not required to be cooled when the vehicle is stationary or running at a low speed, but when the vehicle is running at an accelerated speed or running at a high speed (for example, exceeding the speed threshold), the heat generating component should be cooled accordingly in time to avoid heat dissipation after the temperature rise has increased.
And S22, when the comparison result indicates that the vehicle running speed is less than the preset speed threshold value, adjusting the duty ratio of the PWM heat dissipation component to be a first duty ratio.
And S23, when the comparison result indicates that the running speed of the vehicle is greater than or equal to the speed threshold value, adjusting the duty ratio of the PWM heat dissipation component to be a second duty ratio, wherein the first duty ratio is smaller than the second duty ratio.
The first duty ratio may be 0% or another value greater than 0%, and the second duty ratio is a value greater than the first duty ratio, so that when the vehicle driving speed is too high, the duty ratio of the driving pulse signal output to the PWM heat radiating member may be increased, thereby implementing a heat radiating operation in which a large heat radiating amplitude is applied to the heat generating member.
In the embodiment of the invention, a plurality of ways are provided to realize the adjustment process of the heat dissipation action of the heat dissipation amplitude, for example, when a vehicle is provided with a water pump or a PWM fan, the control of the heat dissipation amplitude of the water pump or the PWM fan can be realized by adjusting the driving pulse; when the vehicle is provided with the single-gear fan, the control on the heat dissipation amplitude can be realized by controlling the on or off of the single-gear fan; and when the vehicle is provided with the multi-gear fan, the gear positions of the fan, such as high, medium and low gears, can be controlled and adjusted, so that the control of the heat dissipation amplitude is realized.
An example of a precalibrated cooling request reference table is shown in Table 1, in which are provided corresponding calibrated cooling request levels (10% -90%) at a plurality of temperatures and rates of temperature change.
In some embodiments, the detected temperature and temperature change rate of the heat generating component of the vehicle may be referred to table 1 to obtain the corresponding cooling request level, and for example, when the detected temperature of the heat generating component is 51 ℃ and the temperature change rate is 0.4 ℃/s, the corresponding cooling request level may be determined to be 20%.
Table 1:
in some embodiments, there are instances where the detected temperature and rate of change of temperature are different from the calibrated temperatures and rates of change of temperature in Table 1, where the corresponding level of cooling request may be determined by way of an approximate match. Specifically, the approximate temperature and the approximate temperature change rate matching with the detected temperature and temperature change rate may be determined in a cooling request reference table, wherein the cooling request reference table includes pre-calibrated relationships among the temperature, the temperature change rate and the cooling request level; further, the corresponding cooling request level is calculated by using the cooling request levels corresponding to the approximate temperature and the approximate temperature change rate.
As shown in fig. 3, a vehicle heat dissipation control method according to another embodiment of the present invention includes:
and S31, detecting the temperature, the temperature change rate and the vehicle running speed of the heat generating components of the vehicle.
And S32, determining a target cooling importance degree corresponding to the detected temperature and the temperature change rate, wherein the cooling importance degree indicates the importance degree of cooling the heat generating components of the vehicle.
In the thermal management process of the vehicle in the related art, personalized consideration on the heat dissipation importance of the heat generating components of the vehicle is not involved, for example, the importance of the vehicle-mounted charger is lower than that of the motor controller, so that the important working devices in the vehicle cannot be reliably heat dissipated.
In view of this, embodiments of the present invention propose and apply a cooling importance level for indicating the importance level of cooling of a heat generating component of a vehicle. Regarding the determination of the target cooling importance in the embodiment of the present invention, it may be realized based on the pre-configured calibrated cooling importance for each heat generating component of the vehicle, and thus it can be directly determined to find out the calibrated cooling importance corresponding to the heat generating component from a plurality of calibrated cooling importance, for example, the cooling importance corresponding to the pre-calibrated motor controller is 9, and when the detected temperature and the temperature change rate are for the motor controller, the determined target cooling importance is 9.
In some embodiments, the detection and control of heat dissipation of a plurality of heat generating components are required, and in this case, the target cooling importance corresponding to the vehicle may be determined specifically by: determining a plurality of corresponding calibrated cooling importance degrees according to a plurality of detected vehicle heat generating components, wherein each vehicle heat generating component corresponds to different calibrated cooling importance degrees respectively; and calculating the determined multiple calibration cooling importance degrees by a linear interpolation method to obtain the target cooling importance degrees corresponding to the detected temperature and the temperature change rate.
And S33, determining the corresponding cooling request level based on the detected temperature, the temperature change rate and the determined target cooling importance.
Specifically, in conjunction with table 1 above, when determining the cooling request level, the corresponding cooling request level may be calculated based on the cooling request levels corresponding to the target cooling importance, the approximate temperature, and the approximate temperature change rate, where the approximate temperature and the approximate temperature change rate may be calibration values approximately matching the detected temperature and temperature change rate in the table. The calculation method can be as follows: when the vehicle controller detects the DC/DC temperature (taking the DC/DC as an example, and the like), subtracting the temperature in the calibration table from the temperature, selecting two temperatures with the difference value of about 0 as a calculation interval, and if one of the differences is 0, selecting two temperatures with the minimum absolute value of the difference value as the calculation interval; when the vehicle control unit calculates the temperature change rate of the DC/DC, subtracting the change rate in the calibration table from the change rate, selecting two temperature change rates with the difference value about 0 as a calculation interval, and if one of the difference values is 0, selecting the change rate and a larger change rate close to the change rate as the calculation interval; a matrix a can be obtained from the calculated intervals determined by the temperature and the rate of change of the temperature,
a, b, c and d are duty ratios in a calibration table; obtaining the temperature change rate and the importance of the temperature through a linear interpolation method according to the detected temperature and the temperature change rate respectively
C＝[h i]Wherein e, f, h, i are weights obtained by linear interpolationA key value;
wherein eh, ei, fh and fi are importance degrees of corresponding duty ratios in the matrix A; and D is aeh + bei + cfh + dfi, and the calculated D is the target cooling request grade under the temperature and the temperature change rate. Therefore, the important degree of the heating components needing to be cooled is considered in the process of vehicle heat dissipation control, and the safety heat management of the important heating components in the process of vehicle heat dissipation control is guaranteed.
S34, based on the detected vehicle running speed and the determined cooling request level, controlling the heat dissipation component to perform heat dissipation action of corresponding heat dissipation amplitude, wherein the heat dissipation amplitude is in positive correlation with the vehicle running speed and the cooling request level.
For some details regarding other aspects of the embodiment shown in fig. 3, reference may be made to the description of other embodiments herein.
The embodiment of the invention also provides a method for controlling the fan and the water pump to dissipate heat, the duty ratio table of the cooling request is calibrated through the temperature and the temperature change rate of different parts, the vehicle control unit inquires the table according to different temperatures and temperature change rates to obtain the cooling request, the fan and the water pump are controlled according to the cooling request, the fan and the water pump can be simultaneously controlled according to the obtained cooling request, and the fans with different control modes can be controlled.
Specifically, firstly, the VCU collects the temperatures of the components (including DC/DC, MCU, OBC, motor, and coolant), calculates the change rate of the temperature every 2 seconds, uses the temperature as one coordinate axis of a duty ratio calibration table, uses the temperature change rate as another coordinate axis, and uses the calibration table as shown in table 1 (the calibration tables of different components are not consistent and can be determined by calibration), and the cooling request is gradually increased along with the increase of the temperature and the increase of the temperature change rate.
In addition, the components detected under different working conditions are different, and the driving working conditions are used for detecting DC/DC, MCU, a motor and cooling liquid; detecting DC/DC, OBC and cooling liquid under a slow charging working condition; and detecting the DC/DC and the cooling liquid under the quick-charging working condition.
According to the detected temperatures of different components and the calculated temperature change rate, a duty ratio can be obtained through a linear interpolation method, the duty ratio is used as a cooling request of the component, the maximum cooling request output of different detection objects is taken to control a fan and a water pump, and meanwhile, the condition of a vehicle speed needs to be considered when the cooling request is low.
Specifically, the embodiments of the present invention also disclose herein heat dissipation control strategies for different types of heat dissipation components, and the following control strategies may be combined in any manner:
the water pump control strategy is as follows: when the cooling request is less than 20% and the vehicle speed is less than 3km/h, the water pump is closed; when the cooling request is less than 20% and the vehicle speed is greater than 5km/h, setting the duty ratio of the water pump to be 20%; when the cooling request is more than or equal to 20% and less than 60%, setting the duty ratio of the water pump to be 30%; when the cooling request is larger than or equal to 60%, the duty ratio of the water pump is set to be 50%.
A fan control strategy comprising:
single-gear fan strategy: when the cooling request is more than or equal to 90%, starting a fan; if the current fan is started, when the cooling request is less than or equal to 85 percent, the fan is closed.
Double-gear fan strategy: when the cooling request is more than or equal to 90%, starting a high-speed fan; if the current high-speed fan is started, when the cooling request is less than or equal to 85 percent, the high-speed fan is closed; if the high-speed fan is not started, when the cooling request is less than or equal to 80% and less than 90%, starting the low-speed fan; if the current low-speed fan is started, when the cooling request is less than or equal to 75 percent, the low-speed fan is closed.
PWM fan strategy: when the cooling request is less than 20% and the vehicle speed is less than 3km/h, the fan is closed; when the cooling request is less than 20% and the vehicle speed is greater than 5km/h, setting the duty ratio of the fan to be 20%; when the cooling request is > 20%, the duty cycle of the fan is the calculated cooling request.
In the embodiment of the invention, cooling requests (or cooling request grades) of different grades are obtained by looking up a table according to the temperature and the temperature change rate, different calibration tables are set according to different parts detected under different working conditions, and a fan and a water pump are controlled according to the cooling requests; in addition, the unified control of the fan and the water pump is beneficial to realizing the platform development, and can ensure more excellent cooling effect; the vehicle speed condition is considered when the temperature of the detection object is low, so that the temperature can be timely reduced when the vehicle speed is increased, and the rapid temperature rise is restrained.
Because the combined control of the fan and the water pump can adopt a set of control strategy, the platform development is facilitated, and the method is suitable for vehicle types with different configurations, thereby reducing the difficulty of subsequent development and maintenance; and because the speed condition is considered when the temperature of the heating part is lower, the problem of untimely temperature reduction caused by too fast running temperature rise can be avoided, and meanwhile, the fan and the water pump can be turned off when the speed is not high, so that the energy-saving effect is achieved, the fan and the water pump work in a cooperative manner, and the high-efficiency balance between energy conservation and temperature reduction is realized.
As shown in fig. 4, a vehicle heat dissipation control system 40 according to an embodiment of the present invention includes: a detection unit 401 for detecting the temperature, the rate of change in temperature, and the vehicle running speed of the heat generating components of the vehicle; a target cooling importance determining unit 402 for determining a target cooling importance corresponding to the detected temperature and the temperature change rate; a cooling request level determination unit 403 for determining a corresponding cooling request level based on the detected temperature, the temperature change rate, and the determined target cooling importance; a heat dissipation control unit 404 for controlling the heat dissipation component to perform a heat dissipation action of a corresponding heat dissipation magnitude based on the detected vehicle running speed and the determined cooling request level, wherein the heat dissipation magnitude has a positive correlation with the vehicle running speed and the cooling request level.
In some embodiments, the heat dissipation part includes a PWM heat dissipation part, wherein the heat dissipation control unit is further configured to adjust a duty ratio of the PWM heat dissipation part based on the detected vehicle driving speed and the determined cooling request level to control the heat dissipation part to perform a heat dissipation action of a corresponding heat dissipation magnitude.
For more details of the vehicle heat dissipation control system according to the embodiment of the present invention, reference may be made to the above description of the vehicle heat dissipation control method, and the same or similar technical effects as those of the vehicle heat dissipation control method may be obtained, so that the details are not repeated herein.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A vehicle heat dissipation control method, characterized by comprising:
detecting the temperature, the temperature change rate and the vehicle running speed of a vehicle heating component;
determining a target cooling importance corresponding to the detected temperature and the temperature change rate, wherein the cooling importance indicates the importance of cooling the heat generating component of the vehicle;
determining a corresponding cooling request level based on the detected temperature, the temperature change rate and the determined target cooling importance;
controlling the heat dissipation component to perform a heat dissipation action of a corresponding heat dissipation magnitude based on the detected vehicle running speed and the determined cooling request level, wherein the heat dissipation magnitude has a positive correlation with the vehicle running speed and the cooling request level.
2. The vehicle heat dissipation control method according to claim 1, wherein the heat dissipation members include a first heat dissipation member and a second heat dissipation member, and wherein the act of controlling the heat dissipation members to perform heat dissipation of the respective heat dissipation magnitudes includes:
controlling the first heat dissipation part and the second heat dissipation part to operate so as to perform a heat dissipation action corresponding to a first heat dissipation amplitude; or
And controlling the first heat dissipation part or the second heat dissipation part to operate so as to execute a heat dissipation action corresponding to a second heat dissipation amplitude, wherein the first heat dissipation amplitude is greater than the second heat dissipation amplitude.
3. The vehicle heat dissipation control method according to claim 1, wherein the heat dissipation component includes a PWM heat dissipation component, and wherein the controlling the heat dissipation component to perform the heat dissipation action of the corresponding heat dissipation magnitude based on the detected vehicle travel speed and the determined cooling request level includes:
and adjusting the duty ratio of the PWM heat dissipation part based on the detected vehicle running speed and the determined cooling request grade so as to control the heat dissipation part to perform heat dissipation action with corresponding heat dissipation amplitude.
4. The vehicle heat dissipation control method according to claim 3, wherein the act of controlling the heat dissipation member to perform heat dissipation of a corresponding magnitude of heat dissipation, based on the detected vehicle travel speed and the determined level of cooling request, comprises:
when the cooling request level is smaller than a preset first temperature and cold threshold value, comparing the vehicle running speed with the preset first speed threshold value; and
when the comparison result indicates that the vehicle running speed is smaller than a preset first speed threshold value, adjusting the duty ratio of the PWM heat dissipation part to be a first duty ratio; and
when the comparison result indicates that the vehicle running speed is greater than or equal to the first speed threshold value, the duty ratio of the PWM heat dissipation component is adjusted to be a second duty ratio, wherein the first duty ratio is smaller than the second duty ratio.
5. The vehicle heat dissipation control method according to claim 1, wherein the heat-generating component includes a dc converter, a motor control unit, an in-vehicle charger, a motor, and a coolant, and wherein the detecting the temperature, the rate of change in the temperature, and the vehicle running speed of the heat-generating component of the vehicle includes:
detecting temperatures and rates of temperature change of different vehicle heat generating components under different vehicle operating conditions for determining respective levels of cooling requests, comprising:
when the vehicle is in a driving working condition, detecting the temperature and the temperature change rate of the direct current converter, the motor control unit, the motor and the cooling liquid;
when the vehicle is in a slow charging working condition, detecting the temperature and the temperature change rate of the direct current converter, the vehicle-mounted charger and the cooling liquid;
and when the vehicle is in a fast charging working condition, detecting the temperature and the temperature change rate of the direct current converter and the cooling liquid.
6. The method of claim 1, wherein the number of detected heat generating components of the vehicle is plural, and wherein the determining the target cooling importance for the detected temperature and the rate of temperature change comprises:
determining a plurality of corresponding calibrated cooling importance degrees according to a plurality of detected vehicle heat generating components, wherein each vehicle heat generating component corresponds to different calibrated cooling importance degrees respectively;
and calculating the determined multiple calibration cooling importance degrees by a linear interpolation method to obtain the target cooling importance degrees corresponding to the detected temperature and the temperature change rate.
7. The method of claim 6, wherein determining a corresponding cooling request level based on the detected temperature, the rate of temperature change, and the determined target cooling importance comprises:
determining an approximate temperature and an approximate temperature change rate matching the detected temperature and temperature change rate in the cooling request reference table, wherein the cooling request reference table includes pre-calibrated relationships among the temperature, the temperature change rate, and the cooling request level;
and calculating the corresponding cooling request grade based on the cooling request grades corresponding to the target cooling importance degree, the approximate temperature and the approximate temperature change rate.
8. The vehicle heat dissipation control method of claim 1, wherein the heat dissipation component comprises one or more of: water pump, single-gear fan, multi-gear fan, and PWM fan.
9. A vehicle heat dissipation control system, characterized in that the vehicle heat dissipation control system comprises:
a detection unit for detecting a temperature, a temperature change rate, and a vehicle running speed of a heat generating component of a vehicle;
a target cooling importance determining unit for determining a target cooling importance corresponding to the detected temperature and the temperature change rate;
a cooling request level determination unit for determining a corresponding cooling request level based on the detected temperature, the temperature change rate, and the determined target cooling importance level;
a heat dissipation control unit for controlling the heat dissipation component to perform a heat dissipation action of a corresponding heat dissipation magnitude based on the detected vehicle running speed and the determined cooling request level, wherein the heat dissipation magnitude has a positive correlation with the vehicle running speed and the cooling request level.
10. The vehicle heat dissipation control system of claim 9, wherein the heat dissipation component comprises a PWM heat dissipation component, and wherein the heat dissipation control unit is further configured to adjust a duty ratio of the PWM heat dissipation component based on the detected vehicle driving speed and the determined cooling request level, so as to control the heat dissipation component to perform a heat dissipation action of a corresponding heat dissipation magnitude.
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