CN118578901B - Hybrid electric vehicle motor torque capacity prediction method, system and storage medium - Google Patents
Hybrid electric vehicle motor torque capacity prediction method, system and storage medium Download PDFInfo
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Abstract
The invention discloses a method, a system and a storage medium for predicting the torque capacity of a motor of a hybrid electric vehicle, wherein the method comprises the following steps: obtaining a maximum allowable current value and a maximum working junction temperature of a power module under the current working condition of a motor of the hybrid electric vehicle; according to the maximum allowable current value and the highest working junction temperature of the power module, a final circulating current effective value of the power module at a predicted time point is calculated in a circulating mode based on a dichotomy; and according to the final circulating current effective value, table look-up is performed to obtain the predicted motor torque capacity of the predicted time point. Therefore, the invention can predict the motor torque capacity of the motor at the predicted time point, and further expands the estimation of the motor torque capacity and the rationality of the whole vehicle torque distribution.
Description
Technical Field
The invention relates to the technical field of hybrid vehicles, in particular to a hybrid vehicle motor torque capacity prediction method, a hybrid vehicle motor torque capacity prediction system and a storage medium.
Background
The hybrid electric vehicle combines the advantages of the traditional internal combustion engine vehicle and the pure electric vehicle, meets the requirement of fuel economy, solves the problem of mileage anxiety, and gradually improves sales volume and market ratio under the increasingly competitive market environment. In order to meet the requirements of dynamic performance and economy under the full-scene working condition, a hybrid electric vehicle with two power sources of an internal combustion engine and a motor is provided, torque distribution between the two power sources needs to be considered according to the characteristics of the two power sources, wherein the distributed torque of the motor cannot exceed the maximum torque capacity of the motor, and therefore estimation of the maximum torque capacity of the motor becomes a key technical problem for optimizing the torque distribution of the whole vehicle.
The current estimation of the torque capacity of the motor only evaluates the maximum torque capacity of the motor in real time from the angle of battery discharge capacity, but the torque distribution proportion is adjusted by considering that the torque distribution under the condition of sudden acceleration needs to predict the torque capacity of the motor at a future time point, and the working temperature of the power module also directly influences the output of the maximum torque capacity of the motor. Therefore, a method for predicting the torque capacity of the motor from the temperature protection angle of the power module is needed, so as to optimize the torque distribution ratio between the two power sources at the prediction time, thereby further improving the comprehensive performance of the hybrid electric vehicle.
Disclosure of Invention
The invention provides a method, a system and a storage medium for predicting the motor torque capacity of a hybrid electric vehicle, which can predict the motor torque capacity of the motor at a predicted time point and further expand the estimation of the motor torque capacity and the rationality of the whole vehicle torque distribution.
In a first aspect, a method for predicting torque capacity of a motor of a hybrid vehicle is provided, including the following steps:
Obtaining a maximum allowable current value and a maximum working junction temperature of a power module under the current working condition of a motor of the hybrid electric vehicle;
according to the maximum allowable current value and the highest working junction temperature of the power module, a final circulating current effective value of the power module at a predicted time point is calculated in a circulating mode based on a dichotomy;
and according to the final circulating current effective value, table look-up is performed to obtain the predicted motor torque capacity of the predicted time point.
According to a first aspect, in a first possible implementation manner of the first aspect, the step of calculating, according to the maximum allowable current value and the highest working junction temperature of the power module, a final circulation current effective value of the power module at a predicted time point based on a dichotomy circulation specifically includes the following steps:
Setting the maximum allowable current value of the power module as a circulating current upper limit value, and acquiring a circulating current lower limit value;
Obtaining a circulating current effective value calculated in each circulation at a predicted time point based on a dichotomy according to the circulating current upper limit value, the circulating current lower limit value and the highest working junction temperature;
and obtaining a corresponding final circulation current effective value when a preset circulation ending condition is reached according to the circulation current effective value calculated in each circulation.
According to a first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the step of obtaining, based on the upper limit value of the circulating current, the lower limit value of the circulating current and the highest working junction temperature, a circulating current effective value calculated at a predicted time point in each cycle based on a dichotomy specifically includes the following steps:
taking the effective value of the circulating current corresponding to the current circulation as the input of the current circulation, and calculating the loss of the power module corresponding to the current circulation;
calculating the temperature deviation of the power module at a predicted time point corresponding to the current cycle according to the highest working junction temperature and the power module loss corresponding to the current cycle;
And obtaining the next circulation input based on a dichotomy to calculate a circulation current effective value corresponding to the next circulation according to the temperature deviation, the preset deviation precision, the circulation current upper limit value and the circulation current lower limit value corresponding to the current circulation.
According to a second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the step of calculating the power module loss corresponding to the current circulation by taking the effective value of the circulation current corresponding to the current circulation as the input of the current circulation comprises the following steps:
Acquiring the IGBT device switching-on loss, the IGBT device switching-off loss and the diode reverse recovery loss of the power module under the working condition of the effective value of the circulating current corresponding to the current circulation;
acquiring IGBT conduction loss and diode conduction loss;
the sum of the switching-on loss of the IGBT device, the switching-off loss of the IGBT device and the switching-on loss of the IGBT device is the total loss of the IGBT device corresponding to the current cycle;
The sum of the reverse recovery loss of the diode and the conduction loss of the diode is the total loss of the diode corresponding to the current cycle.
In a fourth possible implementation manner of the first aspect, the step of obtaining the IGBT turn-on loss and the diode turn-on loss specifically includes the following steps:
The calculation formula of the IGBT conduction loss P cond_IGBT is as follows:
；
The calculation formula of the diode conduction loss P cond_Diode is as follows:
；
Wherein Vce (t) is a calculation function of collector-emitter voltage drop of the IGBT device; VF (t) is a calculation function of the diode conduction voltage drop; t is time; iph (t) is a calculation function of the output phase current; τ (t) is the IGBT device turn-on duty cycle.
According to a second possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, the step of calculating a temperature deviation of the power module when the power module predicts a time point under the current cycle corresponds to according to the highest working junction temperature and the power module loss corresponding to the current cycle specifically includes the following steps:
Calculating target predicted temperature rise of the power module at a predicted time point corresponding to the current cycle according to the power module loss corresponding to the current cycle;
And adding the highest working junction temperature to the target predicted temperature rise, and subtracting the highest junction temperature limit value of the power module to obtain the temperature deviation of the power module when the predicted time point corresponds to the current cycle.
According to a fifth possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, the step of calculating a target predicted temperature rise of the power module when the current next cycle corresponds to a next predicted time point according to the power module loss corresponding to the current cycle specifically includes the following steps:
calculating predicted temperature rise of IGBT device of power module at predicted time point The following are provided:
wherein, ；
；
Calculating a predicted temperature rise of a diode of a power module at a predicted point in timeThe following are provided:
wherein, ；
；
In the method, in the process of the invention,The total loss of the IGBT device is calculated; Is the total loss of the diode; t is the predicted time; The temperature rise time constant of the IGBT device; r 11 and C 11 are respectively the thermal resistance and the thermal capacity of the IGBT device under the current working condition; The temperature rise time constant of the diode to the IGBT device; r 21 and C 21 are respectively the cross thermal resistance and the cross heat capacity of the diode to the IGBT device under the current working condition; is the temperature rise time constant of the diode; r 22 and C 22 are respectively the thermal resistance and the heat capacity of the diode under the current working condition; The temperature rise time constant of the diode for the IGBT device; r 12 and C 12 are respectively the cross thermal resistance and the cross thermal capacitance of the IGBT device to the diode;
And selecting the maximum value between the predicted temperature rise of the IGBT device at the predicted time point and the predicted temperature rise of the diode at the predicted time point as the target predicted temperature rise.
According to a second possible implementation manner of the first aspect, in a seventh possible implementation manner of the first aspect, the step of obtaining a next cycle input based on a dichotomy to calculate a cycle current effective value corresponding to a next cycle according to the temperature deviation, a preset deviation precision, the cycle current upper limit value, and the cycle current lower limit value corresponding to a current cycle specifically includes the following steps:
when the current circulation times are detected to be the first time, acquiring a circulation current effective value corresponding to the first circulation as the circulation current upper limit value;
When the current circulation times are detected to be the second time, if the temperature deviation corresponding to the second circulation is larger than the preset deviation precision, the effective value of the circulation current corresponding to the second circulation is half of the sum between the upper limit value of the circulation current and the lower limit value of the circulation current; if the temperature deviation corresponding to the second circulation is smaller than the preset deviation precision, the effective value of the circulation current corresponding to the second circulation is the upper limit value of the circulation current;
When the current circulation times are detected to be larger than the second time, if the temperature deviation corresponding to the current circulation is larger than the preset deviation precision, updating the upper limit value of the circulation current to be half of the sum between the upper limit value of the circulation current which is not updated and the lower limit value of the circulation current, and the effective value of the circulation current corresponding to the current circulation is the updated upper limit value of the circulation current; if the temperature deviation corresponding to the current circulation is smaller than the preset deviation precision, the updated circulation current lower limit value is half of the sum between the circulation current upper limit value and the unexplored circulation current lower limit value, and the circulation current effective value corresponding to the current circulation is the updated circulation current lower limit value.
In a second aspect, a hybrid vehicle motor torque capacity prediction system is provided, including:
The data acquisition module is used for acquiring the maximum allowable current value and the maximum working junction temperature of the power module under the current working condition of the motor of the hybrid electric vehicle;
The circulation calculation module is in communication connection with the data acquisition module and is used for circularly calculating the final circulation current effective value of the power module at the predicted time point based on a dichotomy according to the maximum allowable current value and the highest working junction temperature of the power module; and
And the table look-up module is in communication connection with the circulation calculation module and is used for looking up a table according to the final circulation current effective value to obtain the predicted motor torque capacity of the predicted time point.
Compared with the prior art, the invention has the following advantages: the method is different from the prior method for evaluating the real-time maximum torque capacity of the motor from the angle of battery discharging capacity, and the motor torque capacity of the motor at a predicted time point is predicted under the temperature limit of a power module, so that the estimation of the motor torque capacity and the rationality of whole-vehicle torque distribution are further expanded, and the continuous and reliable output of the motor torque under the full-scene working condition can be ensured.
Drawings
FIG. 1 is a flow chart of an embodiment of a method for predicting torque capacity of a hybrid vehicle motor according to the present invention;
FIG. 2 is a flow chart of a method for predicting torque capacity of a hybrid vehicle according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of a power module of the present invention;
FIG. 4 is a schematic representation of the motor torque external characteristics of the present invention;
Fig. 5 is a schematic structural diagram of a motor torque capacity prediction system of a hybrid vehicle according to the present invention.
Detailed Description
Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings. While the invention will be described in conjunction with the specific embodiments, it will be understood that they are not intended to limit the invention to the described embodiments. On the contrary, it is intended to cover alternatives, modifications, and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims. It should be noted that the method steps described herein may be implemented by any functional block or arrangement of functions, and any functional block or arrangement of functions may be implemented as a physical entity or a logical entity, or a combination of both.
The present invention will be described in further detail below with reference to the drawings and detailed description for the purpose of enabling those skilled in the art to understand the invention better.
Note that: the examples to be described below are only one specific example, and not as limiting the embodiments of the present invention necessarily to the following specific steps, values, conditions, data, sequences, etc. Those skilled in the art can, upon reading the present specification, make and use the concepts of the invention to construct further embodiments not mentioned in the specification.
Referring to fig. 1, an embodiment of the present invention provides a method for predicting torque capacity of a motor of a hybrid vehicle, including the following steps:
S100, obtaining a maximum allowable current value I rms_max and a maximum working junction temperature T dev of a power module under the current working condition of a motor of the hybrid electric vehicle; the specific structure diagram of the power module is shown in fig. 3, 6 power devices are sequentially arranged on a cold rail side by side, and two ends of the power module are respectively provided with a cooling liquid inlet and a cooling liquid outlet.
S200, circularly calculating a final circulating current effective value of the power module at a predicted time point based on a dichotomy according to the maximum allowable current value and the highest working junction temperature of the power module;
s300, according to the final circulating current effective value, table look-up is performed to obtain the predicted motor torque capacity of the predicted time point.
And (3) checking a motor torque external characteristic table (see fig. 4 in particular) by utilizing the final circulating current effective value, the bus voltage and the motor rotation speed to respectively obtain maximum torque Tpredmax and minimum torque Tpredmin at a predicted time point, namely the predicted motor torque capacity.
Specifically, in this embodiment, the present invention is different from the current method of evaluating the real-time maximum torque capacity of the motor from the angle of battery discharge capacity, and by predicting the motor torque capacity of the motor at the predicted time point (usually 0-20 s) under the temperature limit of the power module, the estimation of the motor torque capacity and the rationality of the whole vehicle torque distribution are further expanded, and the continuous and reliable output of the motor torque under the full scene working condition can be ensured.
Preferably, in another embodiment of the present application, the step S200 of circularly calculating the final circulation current effective value of the power module at the predicted time point based on the dichotomy according to the maximum allowable current value and the maximum working junction temperature of the power module specifically includes the following steps:
s210, setting the maximum allowable current value of the power module as a circulating current upper limit value, and acquiring a circulating current lower limit value;
And taking 0 current as a circulating current lower limit value I low, and taking the maximum allowable current effective value I rms_max as a circulating current upper limit value I up.
S220, obtaining a circulating current effective value calculated in each circulation at a predicted time point based on a dichotomy according to the circulating current upper limit value, the circulating current lower limit value and the highest working junction temperature;
s230, obtaining a corresponding final circulation current effective value when a preset circulation ending condition is reached according to the circulation current effective value calculated in each circulation.
The preset cycle end condition can be set to be that the cycle number is larger than the maximum cycle number, or the absolute value of the corresponding temperature deviation in each cycle calculation process is smaller than or equal to the preset deviation precision; therefore, when the preset cycle end condition is reached, the effective value of the cycle current obtained by calculating the current cycle number can be set as the effective value of the final cycle current.
Preferably, in another embodiment of the present application, the step S220 of obtaining the effective value of the circulating current calculated each time at the predicted time point based on the dichotomy according to the upper limit value of the circulating current, the lower limit value of the circulating current and the highest working junction temperature specifically includes the steps of:
s221, taking a circulating current effective value corresponding to the current circulation as the current circulation input, and calculating the power module loss corresponding to the current circulation;
s222, calculating the temperature deviation of the power module at a predicted time point under the current cycle according to the highest working junction temperature and the power module loss corresponding to the current cycle;
S223, obtaining the next circulation input based on a dichotomy to calculate the circulation current effective value corresponding to the next circulation according to the temperature deviation, the preset deviation precision, the circulation current upper limit value and the circulation current lower limit value corresponding to the current circulation.
Preferably, in another embodiment of the present application, the step S221, taking the effective value of the circulating current corresponding to the current cycle as the input of the current cycle, calculates the power module loss corresponding to the current cycle, specifically includes the following steps:
Acquiring the IGBT device switching-on loss, the IGBT device switching-off loss and the diode reverse recovery loss of the power module under the working condition of the effective value of the circulating current corresponding to the current circulation;
acquiring IGBT conduction loss and diode conduction loss;
the sum of the switching-on loss of the IGBT device, the switching-off loss of the IGBT device and the switching-on loss of the IGBT device is the total loss of the IGBT device corresponding to the current cycle;
The sum of the reverse recovery loss of the diode and the conduction loss of the diode is the total loss of the diode corresponding to the current cycle.
Specifically, in the present embodiment, the present invention,
Firstly, respectively testing the on-loss Eon of an IGBT device, the off-loss Eoff of the IGBT device and the reverse recovery loss Err of a diode under the combination of bus voltage and current effective values of different temperatures of a power module according to a double-pulse test principle, and the on-voltage drop Vce of the IGBT and the on-voltage drop Vf of the diode which change along with phase current under the different temperatures;
Step two, acquiring actual working condition parameters of the IGBT device, and respectively calculating the switching-on loss P on_IGBT, the switching-off loss P off_IGBT and the diode reverse recovery loss P rr_Diode of the IGBT device under the actual working condition by utilizing an IGBT device loss calculation method according to the working condition parameters and the double pulse loss data in the step one;
step three, linearizing the IGBT conduction voltage drop Vce and the diode conduction voltage drop Vf at different temperatures in step one to obtain expressions of the IGBT conduction voltage drop Vce and the diode conduction voltage drop Vf, respectively, as follows:
Wherein Vce (·) is a calculated function of the collector-emitter voltage drop of the IGBT device; VF (·) is the calculated function of the diode turn-on voltage drop; t is time; vce0 is the on-state IGBT device threshold voltage; rce is on-state IGBT on equivalent resistance; VF0 is the on-state diode threshold voltage; rF is the on equivalent resistance of the on-state diode; iph (·) is a calculated function of the output phase current; iph (t) is the output phase current; |·| is an absolute function.
Step four, the step of acquiring the IGBT conduction loss and the diode conduction loss, which specifically comprises the following steps:
The calculation formula of the IGBT conduction loss P cond_IGBT is as follows:
The calculation formula of the diode conduction loss P cond_Diode is as follows:
Wherein Vce (t) is a calculation function of collector-emitter voltage drop of the IGBT device; VF (t) is a calculation function of the diode conduction voltage drop; t is time; iph (t) is a calculation function of the output phase current; τ (t) is the IGBT device turn-on duty cycle.
Therefore, the IGBT device total lossThe method comprises the following steps:
Total loss of diode The method comprises the following steps:
Preferably, in another embodiment of the present application, the step S222 of calculating a temperature deviation of the power module at a predicted time point under the current cycle according to the highest working junction temperature and the power module loss corresponding to the current cycle specifically includes the following steps:
Calculating target predicted temperature rise of the power module at a predicted time point corresponding to the current cycle according to the power module loss corresponding to the current cycle;
And adding the highest working junction temperature to the target predicted temperature rise, and subtracting the highest junction temperature limit value of the power module to obtain the temperature deviation of the power module when the predicted time point corresponds to the current cycle.
Preferably, in another embodiment of the present application, the step of calculating a target predicted temperature rise of the power module at a predicted time point corresponding to the current cycle according to the power module loss corresponding to the current cycle specifically includes the following steps:
Step one, obtaining the thermal resistance and the heat capacity of an IGBT device, the cross thermal resistance and the cross heat capacity of a diode to the IGBT device, the thermal resistance and the heat capacity of the diode, and the cross thermal resistance and the cross heat capacity of the IGBT device to the diode under the combination of different cooling liquid inlet temperatures and flow rates obtained by a thermal resistance test of a power module;
And step two, acquiring the temperature and the flow of the cooling liquid inlet of the motor controller under the current working condition, so that the thermal resistance and the heat capacity of the IGBT device, the cross thermal resistance and the cross heat capacity of the diode to the IGBT device, the thermal resistance and the heat capacity of the diode, and the cross thermal resistance and the cross heat capacity of the IGBT device to the diode under the current working condition can be obtained according to the step one.
Step three, calculating the predicted temperature rise of the IGBT device of the power module at the predicted time pointThe following are provided:
wherein, ；
；
Calculating a predicted temperature rise of a diode of a power module at a predicted point in timeThe following are provided:
wherein, ；
；
In the method, in the process of the invention,The total loss of the IGBT device is calculated; Is the total loss of the diode; t is the predicted time; The temperature rise time constant of the IGBT device; r 11 and C 11 are respectively the thermal resistance and the thermal capacity of the IGBT device under the current working condition; The temperature rise time constant of the diode to the IGBT device; r 21 and C 21 are respectively the cross thermal resistance and the cross heat capacity of the diode to the IGBT device under the current working condition; is the temperature rise time constant of the diode; r 22 and C 22 are respectively the thermal resistance and the heat capacity of the diode under the current working condition; The temperature rise time constant of the diode for the IGBT device; r 12 and C 12 are respectively the cross thermal resistance and the cross thermal capacitance of the IGBT device to the diode;
And step four, selecting the maximum value between the predicted temperature rise of the IGBT device at the predicted time point and the predicted temperature rise of the diode at the predicted time point as the target predicted temperature rise.
Therefore, the target predicted temperature rise is further performed at this timeAdding the highest working junction temperature T dev and subtracting the highest junction temperature limit value T Devlimit of the power module to obtain the temperature deviation of the power module when the current cycle corresponds to the predicted time point。
Preferably, in another embodiment of the present application, the step S223, according to the temperature deviation, the preset deviation precision, the upper limit value of the circulating current, and the lower limit value of the circulating current corresponding to the current cycle, obtains the next circulating input based on the dichotomy, and calculates the circulating current effective value corresponding to the next circulating, specifically includes the following steps:
when the current circulation times are detected to be the first time, acquiring a circulation current effective value corresponding to the first circulation as the circulation current upper limit value;
When the current circulation times are detected to be the second time, if the temperature deviation corresponding to the second circulation is larger than the preset deviation precision, the effective value of the circulation current corresponding to the second circulation is half of the sum between the upper limit value of the circulation current and the lower limit value of the circulation current; if the temperature deviation corresponding to the second circulation is smaller than the preset deviation precision, the effective value of the circulation current corresponding to the second circulation is the upper limit value of the circulation current;
When the current circulation times are detected to be larger than the second time, if the temperature deviation corresponding to the current circulation is larger than the preset deviation precision, updating the upper limit value of the circulation current to be half of the sum between the upper limit value of the circulation current which is not updated and the lower limit value of the circulation current, and the effective value of the circulation current corresponding to the current circulation is the updated upper limit value of the circulation current; if the temperature deviation corresponding to the current circulation is smaller than the preset deviation precision, the updated circulation current lower limit value is half of the sum between the circulation current upper limit value and the unexplored circulation current lower limit value, and the circulation current effective value corresponding to the current circulation is the updated circulation current lower limit value.
Specifically, in the present embodiment, see fig. 2;
Step one, obtaining a lower limit value I low and an upper limit value Iup of the circulating current, and calculating corresponding temperature deviation every time of circulation And the cycle number N cyc;
If the cycle number N cyc is not equal to 1, continuing to execute the third step, otherwise, enabling the effective value I cyc of the circulating current to be equal to the upper limit value Iup of the circulating current, and continuing to execute the fifth step;
step three, if the cycle number N cyc is not equal to 2, continuing to execute step four, otherwise comparing the temperature deviation Deviation from the set accuracyIf the temperature deviates fromGreater than the set deviationThen the circulating current effective value I cyc is equal to half of the sum of the circulating current lower limit value I low and the circulating current upper limit value I up, and the fourth step (this is that the maximum number of cycles has not been reached) is continued; otherwise (temperature deviation)Less than the set deviation) The effective value I cyc of the circulating current is equal to the upper limit value Iup of the circulating current, and the fifth step is continuously executed;
step four, if the cycle number N cyc is greater than 2, and the temperature deviation Greater than the set deviation accuracyThe upper limit value I up of the circulating current is equal to half of the sum of the lower limit value I low of the circulating current and the upper limit value I up of the circulating current, the effective value I cyc of the circulating current is equal to the upper limit value I up of the circulating current, and the fifth step is continuously executed; otherwise (temperature deviation)Less than the set deviation) The circulation current lower limit value I low is equal to half of the sum of the circulation current lower limit value I low and the circulation current upper limit value I up, the circulation current effective value I cyc is equal to the circulation current lower limit value I low, and the fifth step is continuously executed;
and fifthly, outputting a circulating current effective value I cyc.
Referring to fig. 5, the embodiment of the invention also provides a system for predicting the torque capacity of a motor of a hybrid electric vehicle, which comprises:
The data acquisition module is used for acquiring the maximum allowable current value and the maximum working junction temperature of the power module under the current working condition of the motor of the hybrid electric vehicle;
The circulation calculation module is in communication connection with the data acquisition module and is used for circularly calculating the final circulation current effective value of the power module at the predicted time point based on a dichotomy according to the maximum allowable current value and the highest working junction temperature of the power module; and
And the table look-up module is in communication connection with the circulation calculation module and is used for looking up a table according to the final circulation current effective value to obtain the predicted motor torque capacity of the predicted time point.
The motor torque capacity is predicted from the angle of temperature protection of the power module, the method is a further expansion of the existing motor torque capacity estimation, the time range of the motor torque capacity estimation is increased, and the continuous and reliable output of the motor torque under the full-scene working condition can be ensured.
Specifically, the present embodiment corresponds to the foregoing method embodiments one by one, and the functions of each module are described in detail in the corresponding method embodiments, so that a detailed description is not given.
Based on the same inventive concept, the embodiments of the present application also provide a computer-readable storage medium, on which a computer program is stored, which when being executed by a processor implements all or part of the method steps of the above method.
The present invention may be implemented by implementing all or part of the above-described method flow, or by instructing the relevant hardware by a computer program, which may be stored in a computer readable storage medium, and which when executed by a processor, may implement the steps of the above-described method embodiments. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, executable files or in some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the content of the computer readable medium can be appropriately increased or decreased according to the requirements of the jurisdiction's jurisdiction and the patent practice, for example, in some jurisdictions, the computer readable medium does not include electrical carrier signals and telecommunication signals according to the jurisdiction and the patent practice.
Based on the same inventive concept, the embodiment of the application also provides an electronic device, which comprises a memory and a processor, wherein the memory stores a computer program running on the processor, and the processor executes the computer program to realize all or part of the method steps in the method.
The Processor may be a central processing unit (Central Processing Unit, CPU), other general purpose Processor, digital signal Processor (DIGITAL SIGNAL Processor, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), off-the-shelf Programmable gate array (Field-Programmable GATE ARRAY, FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, the processor being a control center of the computer device, and the various interfaces and lines connecting the various parts of the overall computer device.
The memory may be used to store computer programs and/or modules, and the processor implements various functions of the computer device by running or executing the computer programs and/or modules stored in the memory, and invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function (e.g., a sound playing function, an image playing function, etc.); the storage data area may store data (e.g., audio data, video data, etc.) created according to the use of the handset. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart memory card (SMART MEDIA CARD, SMC), secure Digital (SD) card, flash memory card (FLASH CARD), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, server, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), servers and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. The method for predicting the torque capacity of the motor of the hybrid electric vehicle is characterized by comprising the following steps of:
Obtaining a maximum allowable current value and a maximum working junction temperature of a power module under the current working condition of a motor of the hybrid electric vehicle;
according to the maximum allowable current value and the highest working junction temperature of the power module, a final circulating current effective value of the power module at a predicted time point is calculated in a circulating mode based on a dichotomy;
According to the final circulating current effective value, table look-up is performed to obtain the predicted motor torque capacity of a predicted time point;
the step of circularly calculating the final circulating current effective value of the power module at the predicted time point based on the dichotomy according to the maximum allowable current value and the highest working junction temperature of the power module, specifically comprising the following steps:
Setting the maximum allowable current value of the power module as a circulating current upper limit value, and acquiring a circulating current lower limit value;
Obtaining a circulating current effective value calculated in each circulation at a predicted time point based on a dichotomy according to the circulating current upper limit value, the circulating current lower limit value and the highest working junction temperature;
obtaining a corresponding final circulation current effective value when a preset circulation ending condition is reached according to the circulation current effective value calculated in each circulation;
the step of obtaining the effective value of the circulating current calculated each time in a circulating way at a predicted time point based on a dichotomy according to the upper limit value of the circulating current, the lower limit value of the circulating current and the highest working junction temperature, specifically comprises the following steps:
taking the effective value of the circulating current corresponding to the current circulation as the input of the current circulation, and calculating the loss of the power module corresponding to the current circulation;
calculating the temperature deviation of the power module at a predicted time point corresponding to the current cycle according to the highest working junction temperature and the power module loss corresponding to the current cycle;
And obtaining the next circulation input based on a dichotomy to calculate a circulation current effective value corresponding to the next circulation according to the temperature deviation, the preset deviation precision, the circulation current upper limit value and the circulation current lower limit value corresponding to the current circulation.
2. The method for predicting the torque capacity of a hybrid vehicle motor according to claim 1, wherein the step of calculating the power module loss corresponding to the current cycle using the effective value of the circulating current corresponding to the current cycle as the current cycle input specifically comprises the steps of:
Acquiring the IGBT device switching-on loss, the IGBT device switching-off loss and the diode reverse recovery loss of the power module under the working condition of the effective value of the circulating current corresponding to the current circulation;
acquiring IGBT conduction loss and diode conduction loss;
the sum of the switching-on loss of the IGBT device, the switching-off loss of the IGBT device and the switching-on loss of the IGBT device is the total loss of the IGBT device corresponding to the current cycle;
The sum of the reverse recovery loss of the diode and the conduction loss of the diode is the total loss of the diode corresponding to the current cycle.
3. The method for predicting the torque capacity of a hybrid vehicle motor according to claim 2, wherein the step of obtaining the IGBT turn-on loss and the diode turn-on loss comprises the steps of:
The IGBT conduction loss The calculation formula of (2) is as follows:
；
The diode conduction loss The calculation formula of (2) is as follows:
；
Wherein Vce (t) is a calculation function of collector-emitter voltage drop of the IGBT device; VF (t) is a calculation function of the diode conduction voltage drop; t is time; iph (t) is a calculation function of the output phase current; τ (t) is the IGBT device turn-on duty cycle.
4. The method for predicting the torque capacity of a hybrid vehicle motor according to claim 1, wherein the step of calculating the temperature deviation of the power module at the predicted time point corresponding to the current cycle according to the highest working junction temperature and the power module loss corresponding to the current cycle specifically comprises the steps of:
Calculating target predicted temperature rise of the power module at a predicted time point corresponding to the current cycle according to the power module loss corresponding to the current cycle;
And adding the highest working junction temperature to the target predicted temperature rise, and subtracting the highest junction temperature limit value of the power module to obtain the temperature deviation of the power module when the predicted time point corresponds to the current cycle.
5. The method for predicting the torque capacity of a hybrid vehicle motor according to claim 4, wherein the step of calculating the target predicted temperature rise of the power module at the predicted time point corresponding to the current cycle according to the power module loss corresponding to the current cycle specifically comprises the steps of:
calculating predicted temperature rise of IGBT device of power module at predicted time point The following are provided:
；
wherein, ；
；
Calculating a predicted temperature rise of a diode of a power module at a predicted point in timeThe following are provided:
；
wherein, ；
；
In the method, in the process of the invention,The total loss of the IGBT device is calculated; Is the total loss of the diode; t is the predicted time; The temperature rise time constant of the IGBT device; r 11 and C 11 are respectively the thermal resistance and the thermal capacity of the IGBT device under the current working condition; The temperature rise time constant of the diode to the IGBT device; r 21 and C 21 are respectively the cross thermal resistance and the cross heat capacity of the diode to the IGBT device under the current working condition; is the temperature rise time constant of the diode; r 22 and C 22 are respectively the thermal resistance and the heat capacity of the diode under the current working condition; The temperature rise time constant of the diode for the IGBT device; r 12 and C 12 are respectively the cross thermal resistance and the cross thermal capacitance of the IGBT device to the diode;
And selecting the maximum value between the predicted temperature rise of the IGBT device at the predicted time point and the predicted temperature rise of the diode at the predicted time point as the target predicted temperature rise.
6. The method for predicting the torque capacity of a hybrid vehicle motor according to claim 1, wherein the step of obtaining the next cycle input based on the dichotomy to calculate the effective value of the cycle current corresponding to the next cycle according to the temperature deviation, the preset deviation precision, the upper limit value of the cycle current, and the lower limit value of the cycle current corresponding to the current cycle comprises the steps of:
when the current circulation times are detected to be the first time, acquiring a circulation current effective value corresponding to the first circulation as the circulation current upper limit value;
When the current circulation times are detected to be the second time, if the temperature deviation corresponding to the second circulation is larger than the preset deviation precision, the effective value of the circulation current corresponding to the second circulation is half of the sum between the upper limit value of the circulation current and the lower limit value of the circulation current; if the temperature deviation corresponding to the second circulation is smaller than the preset deviation precision, the effective value of the circulation current corresponding to the second circulation is the upper limit value of the circulation current;
When the current circulation times are detected to be larger than the second time, if the temperature deviation corresponding to the current circulation is larger than the preset deviation precision, updating the upper limit value of the circulation current to be half of the sum between the upper limit value of the circulation current which is not updated and the lower limit value of the circulation current, and the effective value of the circulation current corresponding to the current circulation is the updated upper limit value of the circulation current; if the temperature deviation corresponding to the current circulation is smaller than the preset deviation precision, the updated circulation current lower limit value is half of the sum between the circulation current upper limit value and the unexplored circulation current lower limit value, and the circulation current effective value corresponding to the current circulation is the updated circulation current lower limit value.
7. A hybrid vehicle motor torque capacity prediction system, comprising:
The data acquisition module is used for acquiring the maximum allowable current value and the maximum working junction temperature of the power module under the current working condition of the motor of the hybrid electric vehicle;
The circulation calculation module is in communication connection with the data acquisition module and is used for circularly calculating the final circulation current effective value of the power module at the predicted time point based on a dichotomy according to the maximum allowable current value and the highest working junction temperature of the power module; and
The table look-up module is in communication connection with the circulation calculation module and is used for looking up a table according to the final circulation current effective value to obtain the predicted motor torque capacity of a predicted time point;
the step of circularly calculating the final circulating current effective value of the power module at the predicted time point based on the dichotomy according to the maximum allowable current value and the highest working junction temperature of the power module, specifically comprising the following steps:
Setting the maximum allowable current value of the power module as a circulating current upper limit value, and acquiring a circulating current lower limit value;
Obtaining a circulating current effective value calculated in each circulation at a predicted time point based on a dichotomy according to the circulating current upper limit value, the circulating current lower limit value and the highest working junction temperature;
obtaining a corresponding final circulation current effective value when a preset circulation ending condition is reached according to the circulation current effective value calculated in each circulation;
the step of obtaining the effective value of the circulating current calculated each time in a circulating way at a predicted time point based on a dichotomy according to the upper limit value of the circulating current, the lower limit value of the circulating current and the highest working junction temperature, specifically comprises the following steps:
taking the effective value of the circulating current corresponding to the current circulation as the input of the current circulation, and calculating the loss of the power module corresponding to the current circulation;
calculating the temperature deviation of the power module at a predicted time point corresponding to the current cycle according to the highest working junction temperature and the power module loss corresponding to the current cycle;
And obtaining the next circulation input based on a dichotomy to calculate a circulation current effective value corresponding to the next circulation according to the temperature deviation, the preset deviation precision, the circulation current upper limit value and the circulation current lower limit value corresponding to the current circulation.
8. A storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the hybrid vehicle motor torque capacity prediction method according to any one of claims 1 to 6.
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| CN109774491A (en) * | 2017-11-10 | 2019-05-21 | 宝沃汽车（中国）有限公司 | Torque control method, system, vehicle control device and the electric car of electric car |
| JP7169537B2 (en) * | 2018-10-05 | 2022-11-11 | マツダ株式会社 | Drive control device for hybrid vehicle |
| CN113561778A (en) * | 2021-06-29 | 2021-10-29 | 国网天津市电力公司电力科学研究院 | Electric automobile IGBT power module overheating and power circulation control method |
| CN115009042A (en) * | 2021-08-23 | 2022-09-06 | 长城汽车股份有限公司 | Motor torque control method and device, electronic equipment, storage medium and vehicle |
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| CN103684125A (en) * | 2012-09-07 | 2014-03-26 | 福特全球技术公司 | Electric motor torque control |
| CN109515211A (en) * | 2018-11-09 | 2019-03-26 | 四川南骏汽车集团有限公司 | A kind of pure electric automobile motor output torque calculation method |
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