CN117792227A - Method and device for estimating temperature of cooling liquid inlet of vehicle motor controller - Google Patents
Method and device for estimating temperature of cooling liquid inlet of vehicle motor controller Download PDFInfo
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- 239000000110 cooling liquid Substances 0.000 title claims abstract description 72
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- 238000001514 detection method Methods 0.000 claims abstract description 23
- 239000002826 coolant Substances 0.000 claims description 22
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- 230000007613 environmental effect Effects 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
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Abstract
The invention relates to the field of vehicle control, and provides a method and a device for estimating the temperature of a cooling liquid inlet of a vehicle motor controller, wherein the method comprises the following steps: acquiring a sampling temperature through a temperature detection device carried by the IGBT; judging the working state of the motor controller according to whether the power consumption of the IGBT is zero; calculating a temperature difference according to the working state of the motor controller; the temperature difference is the difference between the sampling temperature and the actual temperature of the cooling liquid water inlet; and determining the temperature of the cooling liquid water inlet according to the sampling temperature and the temperature difference. According to the invention, on the premise of not consuming hardware resources, the sampling temperature of the IGBT is monitored in real time to estimate the temperature of the cooling liquid at the all-condition water inlet of the motor controller, the error of the estimation result is within an acceptable range, and the estimation result can be applied to the temperature protection and fault diagnosis of the motor controller for the vehicle.
Description
Technical Field
The invention relates to the technical field of vehicle control, in particular to a method and a device for estimating the temperature of a cooling liquid inlet of a vehicle motor controller.
Background
The motor controller converts the electric energy of the power battery into the electric energy required by the driving motor according to instructions such as gears, throttle, brake and the like to control the starting operation, advancing and retreating speed, climbing force and other running speeds of the electric vehicle or assist the electric vehicle to brake and store part of brake energy into the power battery.
In the running process of the new energy automobile, the temperature protection and fault diagnosis of the motor controller for the automobile are required, so that the temperature of the cooling liquid inlet of the motor controller for the automobile is required to be detected.
In the prior art, most of motor controllers for vehicles are embedded with a temperature sensor at a cooling liquid water inlet, but hardware resources are consumed, and hardware cost is increased.
Disclosure of Invention
The invention provides a method and a device for estimating the temperature of a cooling liquid inlet of a motor controller, which are used for solving the defect that the hardware cost is increased by embedding a temperature sensor in the cooling liquid inlet to detect the temperature of the cooling liquid inlet in the prior art, realizing the effective estimation of the temperature of the cooling liquid inlet of the full-working-condition cooling liquid of an electrolytic controller for a vehicle on the premise of not increasing the hardware cost, and being capable of being applied to the temperature protection and fault diagnosis of the motor controller for the vehicle.
The invention provides a method for estimating the temperature of a cooling liquid inlet of a motor controller for a vehicle, which comprises the following steps:
acquiring a sampling temperature through a temperature detection device carried by the IGBT;
judging the working state of the motor controller according to whether the power consumption of the IGBT is zero;
calculating a temperature difference according to the working state of the motor controller; wherein the temperature difference is the difference between the sampling temperature and the actual temperature of the cooling liquid water inlet;
and determining the temperature of the cooling liquid water inlet according to the sampling temperature and the temperature difference.
According to the method for estimating the temperature of the cooling liquid inlet of the motor controller for the vehicle, which is provided by the invention, the working state of the motor controller is judged according to whether the power consumption of the IGBT is zero or not, and the method comprises the following steps:
when the power consumption of the IGBT is zero, the motor controller is in a normal working condition;
acquiring the change rate of the sampling temperature;
when the power consumption of the IGBT is not zero and the change rate of the sampling temperature is larger than a specific value, the motor controller is in a hot start working condition;
and when the power consumption of the IGBT is not zero and the change rate of the sampling temperature is smaller than or equal to a specific value, the motor controller is in a cold start working condition.
Wherein, the specific value can be selected from 0.045 ℃/s.
According to the method for estimating the temperature of the cooling liquid inlet of the motor controller for the vehicle, which is provided by the invention, the temperature difference is calculated according to the working state of the motor controller, and the method comprises the following steps:
when the motor controller is in a normal working condition, calculating the loss of the IGBT according to the working state of the motor controller;
and determining the temperature of the cooling liquid water inlet according to the sampling temperature, the loss of the IGBT and the thermal resistance parameter of the temperature detection device of the IGBT.
According to the method for estimating the temperature of the cooling liquid inlet of the motor controller for the vehicle, which is provided by the invention, the temperature difference is calculated according to the working state of the motor controller, and the method comprises the following steps:
simulating the cold start working condition to obtain a first curve; wherein the first curve is a corresponding relation curve of the temperature difference and the sampling temperature;
and obtaining a temperature difference according to the first curve and the sampling temperature.
According to the method for estimating the temperature of the cooling liquid inlet of the motor controller for the vehicle, which is provided by the invention, the cold start working condition is simulated to obtain a first curve, and the method comprises the following steps:
under the environmental condition of a laboratory, the temperature of the water inlet cooling liquid is set to be-40 ℃ (Tinlet_N40), 20 ℃ (Tinlet_N20), 0 ℃ (Tinlet_0), 20 ℃ (Tinlet_P20), 40 ℃ (Tinlet_P40) and 60 ℃ (Tinlet_P60);
after each temperature runs for two hours, the sampling temperatures of the temperature detection devices of the IGBT are read, wherein the sampling temperatures are respectively Tntc_N40, tntc_N20, tntc_0, tntc_P20, tntc_P40 and the temperatures of the cooling liquid Tinlet_N40, tinlet_N20, tinlet_0, tinlet_P20, tinlet_P40 and Tinlet_P60;
the temperature difference delta Tc_N40=Tnttc_N40-Tinlet_N40 is calculated, and delta Tc_N20, delta Tc_0, delta Tc_P20, delta Tc_P40 and delta Tc_P60 are also obtained;
the temperature differences Δtc_n40, tc_n20, Δtc_0, Δtc_p20, Δtc_p40 and Δtc_p60 data were linearly discretized to obtain a first curve.
According to the method for estimating the temperature of the cooling liquid inlet of the motor controller for the vehicle, which is provided by the invention, the temperature difference is calculated according to the working state of the motor controller, and the method comprises the following steps:
simulating the hot start working condition to obtain a second curve; the second curve is a corresponding relation curve of the change rate of the sampling temperature and the temperature difference;
and obtaining a temperature difference according to the second curve and the sampling temperature.
According to the method for estimating the temperature of the cooling liquid inlet of the motor controller for the vehicle, which is provided by the invention, the hot start working condition is simulated to obtain a second curve, and the method comprises the following steps:
under the laboratory condition, placing the IGBT in an environmental bin, setting the environmental bin to be 20 ℃, 40 ℃, 60 ℃, 80 ℃ and 100 ℃ respectively, running for one hour respectively, then setting the temperature of cooling liquid to be 0 ℃, starting a cooling system, monitoring and calculating the temperature difference slope RTslop_20, RTslop_40, RTslop_60, RTslop_80 and RTslop_100 of the IGBT under the temperature difference of 20 ℃, 40 ℃, 60 ℃, 80 ℃ and 100 ℃ respectively;
and linearly discretizing the data of the temperature difference slopes RTslop_20, RTslop_40, RTslop_60, RTslop_80 and RTslop_100 to obtain the second curve.
The invention also provides a device for estimating the temperature of the cooling liquid inlet of the motor controller for the vehicle, which comprises the following components:
the temperature detection module is arranged on the IGBT and used for acquiring sampling temperature;
the judging module is used for judging the working state of the motor controller according to the power consumption and the temperature change rate of the IGBT;
the storage module is used for storing a first curve of the corresponding relation between the temperature difference and the sampling temperature under the cold starting working condition of the motor controller and a second curve of the corresponding relation between the change rate of the sampling temperature and the temperature difference under the hot starting working condition;
the processing module is used for calculating the temperature difference according to the first curve or the second curve based on the working state of the motor controller; wherein the temperature difference is the difference between the sampling temperature and the actual temperature of the cooling liquid water inlet;
and the calculation module is used for determining the temperature of the cooling liquid water inlet according to the sampling temperature and the temperature difference.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the steps of the cooling liquid water inlet temperature estimation method of the motor controller for the vehicle when executing the program.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method of estimating a coolant inlet temperature of a motor controller for a vehicle as described in any one of the above.
According to the method and the device for estimating the temperature of the cooling liquid inlet of the motor controller for the vehicle, provided by the invention, the sampling temperature is obtained through the temperature detection device of the IGBT, and the working state of the motor controller is judged according to whether the power consumption of the IGBT is zero or not; the temperature difference is calculated according to the working state of the motor controller, the temperature of the cooling liquid water inlet is determined according to the sampling temperature and the temperature difference, the sampling temperature of the IGBT is monitored in real time to estimate the temperature of the cooling liquid at the full working condition water inlet of the motor controller on the premise of not consuming hardware resources, the error of an estimation result is within an acceptable range, and the estimation result can be applied to temperature protection and fault diagnosis of the motor controller for the vehicle.
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In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for estimating the temperature of a cooling liquid inlet of a motor controller for a vehicle according to the present invention;
FIG. 2 is a second flow chart of the method for estimating the temperature of the coolant inlet of the motor controller for a vehicle according to the present invention;
FIG. 3 is a line drawing of a first curve provided by the present invention;
FIG. 4 is a line drawing of a second curve provided by the present invention;
FIG. 5 is a schematic diagram of a cooling liquid inlet temperature estimation device of a motor controller for a vehicle according to the present invention;
fig. 6 is a schematic structural diagram of an electronic device provided by the present invention;
1. a temperature detection module; 2. a judging module; 3. a storage module; 4. a processing module; 5. and a calculation module.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The method for estimating the temperature of the coolant inlet of the motor controller for a vehicle according to the present invention will be described with reference to fig. 1 to 2.
Firstly, it should be noted that, the temperature of the cooling liquid inlet of the motor controller is estimated, and the full working condition of the motor controller needs to be effectively estimated, rather than the working condition of the IGBT during working; the full operating mode of the motor controller comprises the following steps: cold start conditions, hot start conditions, and normal operating conditions.
The cold start working condition means that the interval time between the IGBT and the last start working is long, and the IGBT and the environment are in cold state balance. The hot start condition means that the interval time between the hot start condition and the last start operation is short enough, and the temperature of the IBGT is higher than the ambient temperature.
As shown in fig. 1, an embodiment of a first aspect of the present invention provides a method for estimating a temperature of a coolant inlet of a motor controller for a vehicle, including the steps of:
s110, acquiring a sampling temperature through a temperature detection device of the IGBT.
The IGBT is an insulated gate bipolar transistor, is a core component for energy conversion and transmission, is mainly responsible for controlling the driving and protection of a motor, and can control the running state of the motor by controlling the on-off of the IGBT so as to realize the operations of starting, stopping, accelerating, decelerating and the like of the motor. The temperature detection device of the IGBT can select a temperature sensor, and the temperature sensor is usually integrated inside the IGBT module and can monitor the working temperature of the IGBT in real time.
In addition, the sampling temperature can be understood as the current real-time temperature of the IGBT.
S120, judging the working state of the motor controller according to whether the power consumption of the IGBT is zero.
When the power consumption of the IGBT is zero, the motor controller is in a normal working condition; when the power consumption of the IGBT is not zero, the motor controller is in an abnormal working condition, and the abnormal working condition comprises a cold starting working condition and a hot starting working condition. Therefore, whether the motor controller is in a normal working state can be judged according to whether the power consumption of the IBGT is zero, so that the motor controller corresponds to different subsequent estimation methods.
S130, calculating a temperature difference according to the working state of the motor controller; the temperature difference is the difference between the sampling temperature and the actual temperature of the cooling liquid water inlet.
The sampling temperature refers to the current real-time temperature of the IGBT; the actual temperature of the coolant inlet refers to the temperature at which the coolant enters the motor controller.
Temperature difference = sampling temperature-actual temperature of the coolant inlet.
S140, determining the temperature of the cooling liquid water inlet according to the sampling temperature and the temperature difference.
Cooling fluid inlet temperature = sampling temperature + temperature difference.
According to the method for estimating the temperature of the cooling liquid inlet of the motor controller for the vehicle, provided by the embodiment of the invention, sampling temperature is obtained through the temperature detection device of the IGBT, and the working state of the motor controller is judged according to whether the power consumption of the IGBT is zero or not; the temperature difference is calculated according to the working state of the motor controller, the temperature of the cooling liquid water inlet is determined according to the sampling temperature and the temperature difference, the sampling temperature of the IGBT is monitored in real time to estimate the temperature of the cooling liquid at the full working condition water inlet of the motor controller on the premise of not consuming hardware resources, the error of an estimation result is within an acceptable range, and the estimation result can be applied to temperature protection and fault diagnosis of the motor controller for the vehicle.
In one possible embodiment of the present invention, in step S120, it includes:
when the power consumption of the IGBT is zero, the motor controller is in a normal working condition;
acquiring the change rate of the sampling temperature;
when the power consumption of the IGBT is not zero and the change rate of the sampling temperature is larger than a specific value, the motor controller is in a hot start working condition;
when the power consumption of the IGBT is not zero and the change rate of the sampling temperature is smaller than or equal to a specific value, the motor controller is in a cold start working condition.
In one embodiment of the present invention, the step of calculating the temperature difference according to the operation state of the motor controller includes:
when the motor controller is in a normal working condition, calculating the loss of the IGBT according to the working state of the motor controller;
and determining the temperature of the cooling liquid water inlet according to the sampling temperature, the loss of the IGBT and the thermal resistance parameter of the temperature detection device of the IGBT.
Specifically, under normal operating conditions, the IGBT is generating losses. Firstly, testing the NTC of an IGBT and the thermal resistance Rth of a water inlet on a motor rack; loss Ploss of the IGBT module during operation is estimated in software, the temperature Tntc of an NTC temperature sensor of the IGBT module is detected, and the temperature of a water inlet cooling liquid of a cooling system during operation of a motor controller for a new energy vehicle is estimated: that is, according to the thermal path formula Δt=ploss×rth, the temperature difference Δtntc2inlet=ploss×rth between the NTC and the water inlet is calculated, thereby obtaining:
water inlet temperature tinlet=tntc+Δtntc2inlet.
In one possible embodiment of the present invention, in step S130, the step of calculating the temperature difference according to the operation state of the motor controller includes the steps of:
s131, simulating the cold start working condition to obtain a first curve; the first curve is a corresponding relation curve of the temperature difference and the sampling temperature;
s132, obtaining a temperature difference according to the first curve and the sampling temperature.
Specifically, in step S131, the simulating the cold start condition to obtain a first curve includes:
under the environmental condition of a laboratory, the temperature of the water inlet cooling liquid is set to be-40 ℃ (Tinlet_N40), 20 ℃ (Tinlet_N20), 0 ℃ (Tinlet_0), 20 ℃ (Tinlet_P20), 40 ℃ (Tinlet_P40) and 60 ℃ (Tinlet_P60);
after each temperature runs for two hours, the sampling temperatures of the temperature detection devices of the IGBT are read, wherein the sampling temperatures are respectively Tntc_N40, tntc_N20, tntc_0, tntc_P20, tntc_P40 and the temperatures of the cooling liquid Tinlet_N40, tinlet_N20, tinlet_0, tinlet_P20, tinlet_P40 and Tinlet_P60;
the temperature difference delta Tc_N40=Tnttc_N40-Tinlet_N40 is calculated, and delta Tc_N20, delta Tc_0, delta Tc_P20, delta Tc_P40 and delta Tc_P60 are also obtained;
the temperature differences Δtc_n40, tc_n20, Δtc_0, Δtc_p20, Δtc_p40 and Δtc_p60 data were linearly discretized to obtain a first curve, as shown in fig. 3.
The estimation process during the cold start working condition is that the real-time temperature Tntc of the NTC temperature sensor of the IGBT module and the change rate RTslope of the temperature of the NTC temperature sensor are monitored in real time, if the RTslope is smaller than a specific value, namely, the current working condition is judged to be the cold start working condition, according to a first curve, namely, in software, the temperature difference delta Tc can be obtained by looking up the table according to the real-time temperature Tntc of the IGBT module in a table look-up mode. Thereby estimate the cooling system water inlet coolant liquid temperature when the motor controller for new energy vehicle cold start:
i.e. water inlet tinlet=tntc+Δtc.
In one possible embodiment of the present invention, in step S130, calculating the temperature difference according to the operation state of the motor controller includes:
s133, simulating a hot start working condition to obtain a second curve; the second curve is a corresponding relation curve of the change rate of the sampling temperature and the temperature difference;
s134, obtaining the temperature difference according to the second curve and the sampling temperature.
Specifically, in step S133, the hot start condition is simulated, and the second curve is obtained, including the following steps:
under the laboratory condition, placing the IGBT in an environmental bin, setting the environmental bin to be 20 ℃, 40 ℃, 60 ℃, 80 ℃ and 100 ℃ respectively, running for one hour respectively, then setting the temperature of cooling liquid to be 0 ℃, starting a cooling system, monitoring and calculating the temperature difference slope RTslop_20, RTslop_40, RTslop_60, RTslop_80 and RTslop_100 of the IGBT under the temperature difference of 20 ℃, 40 ℃, 60 ℃, 80 ℃ and 100 ℃ respectively;
and (3) linearly discretizing the temperature difference slope RTslop_20, RTslop_40, RTslop_60, RTslop_80 and RTslop_100 data to obtain a second curve, as shown in fig. 4.
The motor controller is located the estimation process of hot start operating mode, and the interval time of IGBT and last start operation is short enough, and the temperature of IGBT is higher than ambient temperature, and the temperature still is in the decline trend, and the rate of change RTslope of NTC temperature sensor temperature that monitors at this moment is greater than a specific value.
Calculating the change rate RTslope of the temperature of the NTC temperature sensor of the IGBT module in real time in software, and obtaining a real-time delta Th value according to the relative relation between the RTslope and the delta Th; thereby estimate the cooling system water inlet coolant liquid temperature when the motor controller for new energy vehicle hot start:
i.e. water inlet tinlet=tntc+ +Δth.
As shown in fig. 5, the description of the cooling liquid inlet temperature estimation device for a motor controller for a vehicle provided by the invention is provided below, and the cooling liquid inlet temperature estimation device for a motor controller for a vehicle and the cooling liquid inlet temperature estimation method for a motor controller for a vehicle described below can be referred to correspondingly.
An embodiment of the second aspect of the present invention provides a cooling liquid inlet temperature estimation device of a vehicle motor controller, which comprises a temperature detection module 1, a judgment module 2, a storage module 3, a processing module 4 and a calculation module 5. The temperature detection module 1 is arranged on the IGBT and used for acquiring sampling temperature, and the temperature acquired by the temperature detection module 1 can be determined to be the real-time temperature of the IGBT. The judging module 2 is used for judging the working state of the motor controller according to the power consumption and the temperature change rate of the IGBT; the storage module 3 is used for storing a first curve of the corresponding relation between the temperature difference and the sampling temperature under the cold starting working condition of the motor controller and a second curve of the corresponding relation between the change rate of the sampling temperature and the temperature difference under the hot starting working condition; the processing module 4 is used for calculating the temperature difference according to the first curve or the second curve based on the working state of the motor controller; the temperature difference is the difference between the sampling temperature and the actual temperature of the cooling liquid water inlet. The calculation module 5 is used for determining the temperature of the cooling liquid water inlet according to the sampling temperature and the temperature difference.
According to the cooling liquid inlet temperature estimation device for the motor controller for the vehicle, provided by the embodiment of the second aspect of the invention, the temperature detection module 1 is used for acquiring the sampling temperature, the judgment module 2 is used for judging the working state of the motor controller according to the power consumption and the temperature change rate of the IGBT, the storage module 3 is used for storing a first curve of the corresponding relation between the temperature difference and the sampling temperature under the cold starting working condition of the motor controller and a second curve of the corresponding relation between the change rate of the sampling temperature and the temperature difference under the hot starting working condition, the processing module 4 is used for calculating the temperature difference according to the first curve or the second curve based on the working state of the motor controller, and the calculation module 5 is used for determining the cooling liquid inlet temperature according to the sampling temperature and the temperature difference. The device for estimating the temperature of the cooling liquid inlet of the motor controller for the vehicle can estimate the temperature of the cooling liquid inlet of the motor controller under the full working condition by utilizing the sampling temperature of the IGBT monitored in real time on the premise of not consuming hardware resources, the error of the estimation result is within an acceptable range, and the estimation result can be applied to temperature protection and fault diagnosis of the motor controller for the vehicle.
Fig. 6 illustrates a physical schematic diagram of an electronic device, as shown in fig. 6, which may include: processor 610, communication interface (Communications Interface) 620, memory 630, and communication bus 640, wherein processor 610, communication interface 620, and memory 630 communicate with each other via communication bus 640. The processor 610 may invoke logic instructions in the memory 630 to perform a method for estimating a coolant inlet temperature of a motor controller for a vehicle, the method comprising:
acquiring a sampling temperature through a temperature detection device carried by the IGBT;
judging the working state of the motor controller according to whether the power consumption of the IGBT is zero;
calculating a temperature difference according to the working state of the motor controller; wherein the temperature difference is the difference between the sampling temperature and the actual temperature of the cooling liquid water inlet;
and determining the temperature of the cooling liquid water inlet according to the sampling temperature and the temperature difference.
Further, the logic instructions in the memory 630 may be implemented in the form of software functional units and stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, are capable of performing the method for estimating the coolant inlet temperature of a motor controller for a vehicle provided by the above methods, the method comprising:
acquiring a sampling temperature through a temperature detection device carried by the IGBT;
judging the working state of the motor controller according to whether the power consumption of the IGBT is zero;
calculating a temperature difference according to the working state of the motor controller; wherein the temperature difference is the difference between the sampling temperature and the actual temperature of the cooling liquid water inlet;
and determining the temperature of the cooling liquid water inlet according to the sampling temperature and the temperature difference.
In still another aspect, the present invention provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform the above-provided method for estimating a temperature of a coolant inlet of a motor controller for a vehicle, the method comprising:
acquiring a sampling temperature through a temperature detection device carried by the IGBT;
judging the working state of the motor controller according to whether the power consumption of the IGBT is zero;
calculating a temperature difference according to the working state of the motor controller; wherein the temperature difference is the difference between the sampling temperature and the actual temperature of the cooling liquid water inlet;
and determining the temperature of the cooling liquid water inlet according to the sampling temperature and the temperature difference.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the embodiments of the present invention will be understood by those of ordinary skill in the art according to specific circumstances.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "manner," "particular modes," or "some modes," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or mode is included in at least one embodiment or mode of the embodiments of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or manner. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or ways. Furthermore, various embodiments or modes and features of various embodiments or modes described in this specification can be combined and combined by those skilled in the art without mutual conflict.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The method for estimating the temperature of the cooling liquid inlet of the motor controller for the vehicle is characterized by comprising the following steps of:
acquiring a sampling temperature through a temperature detection device carried by the IGBT;
judging the working state of the motor controller according to whether the power consumption of the IGBT is zero;
calculating a temperature difference according to the working state of the motor controller; wherein the temperature difference is the difference between the sampling temperature and the actual temperature of the cooling liquid water inlet;
and determining the temperature of the cooling liquid water inlet according to the sampling temperature and the temperature difference.
2. The method for estimating a coolant inlet temperature of a motor controller for a vehicle according to claim 1, wherein the determining the operating state of the motor controller according to whether the power consumption of the IGBT is zero comprises:
when the power consumption of the IGBT is zero, the motor controller is in a normal working condition;
acquiring the change rate of the sampling temperature;
when the power consumption of the IGBT is not zero and the change rate of the sampling temperature is larger than a specific value, the motor controller is in a hot start working condition;
and when the power consumption of the IGBT is not zero and the change rate of the sampling temperature is smaller than or equal to a specific value, the motor controller is in a cold start working condition.
3. The method for estimating a coolant inlet temperature of a motor controller for a vehicle according to claim 2, wherein the calculating a temperature difference according to an operation state of the motor controller comprises:
when the motor controller is in a normal working condition, calculating the loss of the IGBT according to the working state of the motor controller;
and determining the temperature of the cooling liquid water inlet according to the sampling temperature, the loss of the IGBT and the thermal resistance parameter of the temperature detection device of the IGBT.
4. The method for estimating a coolant inlet temperature of a motor controller for a vehicle according to claim 2, wherein the calculating a temperature difference according to an operation state of the motor controller comprises:
simulating the cold start working condition to obtain a first curve; wherein the first curve is a corresponding relation curve of the temperature difference and the sampling temperature;
and obtaining a temperature difference according to the first curve and the sampling temperature.
5. The method for estimating a coolant inlet temperature of a vehicle motor controller according to claim 4, wherein said simulating the cold start condition to obtain a first curve comprises:
under the environmental condition of a laboratory, the temperature of the water inlet cooling liquid is set to be-40 ℃ (Tinlet_N40), 20 ℃ (Tinlet_N20), 0 ℃ (Tinlet_0), 20 ℃ (Tinlet_P20), 40 ℃ (Tinlet_P40) and 60 ℃ (Tinlet_P60);
after each temperature runs for two hours, the sampling temperatures of the temperature detection devices of the IGBT are read, wherein the sampling temperatures are respectively Tntc_N40, tntc_N20, tntc_0, tntc_P20, tntc_P40 and the temperatures of the cooling liquid Tinlet_N40, tinlet_N20, tinlet_0, tinlet_P20, tinlet_P40 and Tinlet_P60;
the temperature difference delta Tc_N40=Tnttc_N40-Tinlet_N40 is calculated, and delta Tc_N20, delta Tc_0, delta Tc_P20, delta Tc_P40 and delta Tc_P60 are also obtained;
the temperature differences Δtc_n40, tc_n20, Δtc_0, Δtc_p20, Δtc_p40 and Δtc_p60 data were linearly discretized to obtain a first curve.
6. The method for estimating a coolant inlet temperature of a motor controller for a vehicle according to claim 2, wherein the calculating a temperature difference according to an operation state of the motor controller comprises:
simulating the hot start working condition to obtain a second curve; the second curve is a corresponding relation curve of the change rate of the sampling temperature and the temperature difference;
and obtaining a temperature difference according to the second curve and the sampling temperature.
7. The method for estimating a coolant inlet temperature of a vehicle motor controller according to claim 6, wherein said simulating the hot start condition to obtain a second curve includes:
under the laboratory condition, placing the IGBT in an environmental bin, setting the environmental bin to be 20 ℃, 40 ℃, 60 ℃, 80 ℃ and 100 ℃ respectively, running for one hour respectively, then setting the temperature of cooling liquid to be 0 ℃, starting a cooling system, monitoring and calculating the temperature difference slope RTslop_20, RTslop_40, RTslop_60, RTslop_80 and RTslop_100 of the IGBT under the temperature difference of 20 ℃, 40 ℃, 60 ℃, 80 ℃ and 100 ℃ respectively;
and linearly discretizing the data of the temperature difference slopes RTslop_20, RTslop_40, RTslop_60, RTslop_80 and RTslop_100 to obtain the second curve.
8. A vehicle motor controller coolant water inlet temperature estimation device, using the vehicle motor controller coolant water inlet temperature estimation method according to any one of claims 1 to 7, characterized by comprising:
the temperature detection module (1) is arranged on the IGBT and used for acquiring sampling temperature;
the judging module (2) is used for judging the working state of the motor controller according to the power consumption and the temperature change rate of the IGBT;
the storage module (3) is used for storing a first curve of the corresponding relation between the temperature difference and the sampling temperature under the cold starting working condition of the motor controller and a second curve of the corresponding relation between the change rate of the sampling temperature and the temperature difference under the hot starting working condition;
a processing module (4) for calculating a temperature difference from the first curve or the second curve based on the operating state of the motor controller; wherein the temperature difference is the difference between the sampling temperature and the actual temperature of the cooling liquid water inlet;
and the calculation module (5) is used for determining the temperature of the cooling liquid water inlet according to the sampling temperature and the temperature difference.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method for estimating the coolant inlet temperature of a motor controller for a vehicle according to any one of claims 1 to 7 when executing the program.
10. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the steps of the method for estimating a coolant inlet temperature of a motor controller for a vehicle according to any one of claims 1 to 7.
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| CN202311822722.0A CN117792227A (en) | 2023-12-27 | 2023-12-27 | Method and device for estimating temperature of cooling liquid inlet of vehicle motor controller |
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| CN202311822722.0A CN117792227A (en) | 2023-12-27 | 2023-12-27 | Method and device for estimating temperature of cooling liquid inlet of vehicle motor controller |
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