CN104859483A - Torque correction coefficient calculation and torque analysis methods and systems for electric automobile - Google Patents
Torque correction coefficient calculation and torque analysis methods and systems for electric automobile Download PDFInfo
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- CN104859483A CN104859483A CN201410222853.XA CN201410222853A CN104859483A CN 104859483 A CN104859483 A CN 104859483A CN 201410222853 A CN201410222853 A CN 201410222853A CN 104859483 A CN104859483 A CN 104859483A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/72—Electric energy management in electromobility
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Abstract
The invention provides torque corrosion coefficient calculation and torque analysis methods and systems for an electric automobile. Besides consideration of motor speeds and opening degrees of an accelerator pedal, speeds of the automobile and fault levels are comprehensively considered to determine correction coefficients and correction starting points of torque, and required torque for system analysis is corrected in real time. When the speeds of the automobile and the fault levels are different and the opening degrees of the accelerator pedal are the same, different torque corrosion coefficients can be obtained, and more accurate toque analysis coefficients are obtained; with the adoption of the scheme, more accurate and more comprehensive consideration factors are provided for actual output torque of a motor, and the torque control precision of the whole automobile is improved.
Description
Technical field
The present invention relates to a kind of Control of Electric Vehicles technical field, relate to a kind of method and system that torque correction factor calculates and moment of torsion is resolved of electronlmobil particularly.
Background technology
Under the social overall background of energy-conserving and environment-protective, to develop and the new-energy automobile releasing energy-conserving and environment-protective defines common recognition, electronlmobil is because of its significant effects of energy saving and emission reduction, domestic and international car company is all classified as important developing direction, therefore has very important significance to the R and D of its gordian technique.Electronlmobil is with on-board high-voltage battery for single power source, and by the new-energy automobile of motor direct-drive, as the actuating device of electronlmobil, the output torque of motor determines the travel conditions of electronlmobil.
In prior art about a kind of method of electric automobile torque security monitoring as shown in Figure 1.Output torque coefficient is determined by looking into bivariate table according to motor speed and acceleration pedal aperture.Record motor speed, corresponding relation between acceleration pedal aperture and output torque coefficient in bivariate table wherein, after determining motor speed and acceleration pedal aperture, output torque coefficient corresponding with it can be obtained directly and accurately.According to factor certainty annuity maximum available torque such as the maximum permissible torque of motor in system, the maximum discharge power of battery and maximum charge power.Output torque coefficient is multiplied with system maximum available torque can certainty annuity demand torque.
Said method of the prior art only determines output torque coefficient according to the rotating speed of motor and acceleration pedal aperture.As long as namely motor speed is identical with acceleration pedal aperture, regardless of Full Vehicle System state, output torque coefficient is exactly identical.Motor is as the direct drive unit of electronlmobil, and its actual output torque will inevitably be subject to the impact of Full Vehicle System state except receiving the impact of motor speed and acceleration pedal aperture.And the moment of torsion of the actual output of motor determines on the basis of system requirements moment of torsion, if system requirements moment of torsion is when resolving, only consider motor speed and acceleration pedal aperture, so when the factors such as Full Vehicle System state, fault handling mode change, system requirements moment of torsion can't change, and the actual output torque of the motor obtained on this basis also can not change.Obviously, above-mentioned processing mode does not conform to the real-world operation state of motor, and the actual output torque of the motor obtained is inaccurate, in the operational process of electronlmobil, there is certain potential safety hazard.
Summary of the invention
For this reason, technical matters to be solved by this invention is the impact only considering motor speed and acceleration pedal aperture in prior art for the method for resolving vehicle electric system demand torque, do not consider Full Vehicle System state, the actual output torque of the motor obtained on this basis is inaccurate, safety factor is low, thus proposes a kind of method and system that torque correction factor calculates and moment of torsion is resolved considering the electronlmobil of Full Vehicle System state.
For solving the problems of the technologies described above, the invention provides following technical scheme:
The invention provides a kind of torque correction factor method of calculating of electronlmobil, comprise the steps:
S1: obtain system status parameters, described system status parameters comprises motor speed, acceleration pedal aperture, the speed of a motor vehicle and system failure grade;
S2: according to the described speed of a motor vehicle and described system failure grade determination revision level with revise initial point;
S3: according to described revision level and described motor speed determination torque correction factor.
The torque correction factor method of calculating of above-mentioned electronlmobil, the detailed process of step S2 is as follows:
Utilize the speed of a motor vehicle and the positive grade classification table of system failure social estate system periodical repair, the described speed of a motor vehicle obtained according to step S1 and described system failure grade utilize look-up table determination revision level and revise initial point.
The torque correction factor method of calculating of above-mentioned electronlmobil, in step S2:
Described correction initial point refers to the initial pedal aperture revised moment of torsion parsing coefficient.
The torque correction factor method of calculating of above-mentioned electronlmobil, the detailed process of step S3 is as follows:
Utilize revision level and motor speed to formulate torque correction factor table, utilize look-up table determination torque correction factor according to the described motor speed obtained in the described revision level obtained in step S2 and step S1.
The present invention also provides a kind of moment of torsion analytic method of electronlmobil, comprises the steps:
W1: according to the torque correction factor method of calculating of above-mentioned electronlmobil, obtains the torque correction factor of electronlmobil;
W2: resolve coefficient according to described torque correction factor and moment of torsion and obtain revised moment of torsion and resolve coefficient.
The present invention also provides a kind of torque correction factor computing system of electronlmobil, comprising:
Parameter acquisition module, for obtaining system status parameters, described system status parameters comprises motor speed, acceleration pedal aperture, the speed of a motor vehicle and system failure grade;
First correcting module, according to parameter acquisition module obtain the speed of a motor vehicle and failure system grade determination revision level and revise initial point;
Second correcting module, the revision level obtained according to described first correcting module and motor speed determination torque correction factor.
The torque correction factor computing system of above-mentioned electronlmobil, store the revision level classification scheme utilizing the speed of a motor vehicle and system failure grade to formulate in described first correcting module, the described speed of a motor vehicle obtained according to parameter acquisition module and described system failure grade utilize look-up table determination revision level and revise initial point.
The torque correction factor computing system of above-mentioned electronlmobil, in described first correcting module, described correction initial point refers to the initial pedal aperture revised moment of torsion parsing coefficient.
The torque correction factor computing system of above-mentioned electronlmobil, store in described second correcting module and utilize revision level and motor speed to formulate torque correction factor table, the described motor speed that the described revision level obtained according to the first correcting module and parameter acquisition module obtain utilizes look-up table determination torque correction factor.
The present invention also provides a kind of moment of torsion resolution system of electronlmobil, comprise the torque correction factor computing system of above-described electronlmobil, for obtaining the torque correction factor of electronlmobil, also comprise: the first computing module, resolve coefficient according to described torque correction factor and moment of torsion and obtain revised moment of torsion and resolve coefficient.
Technique scheme of the present invention has the following advantages compared to existing technology:
(1) the torque correction factor method of calculating of electronlmobil of the present invention and system, considering outside motor speed and acceleration pedal aperture, also considered the speed of a motor vehicle and fault level to determine torque correction factor and to revise initial point.When the speed of a motor vehicle is different with fault level, and when acceleration pedal aperture is identical, different torque correction factors can be obtained.The actual output torque that such scheme of the present invention is motor provides more accurately, more fully Consideration, improves the moment of torsion control accuracy of car load.
(2) the moment of torsion analytic method of electronlmobil of the present invention and system, considers the Full Vehicle System state parameter of electronlmobil when obtaining moment of torsion and resolving coefficient, therefore, it is possible to obtain moment of torsion more accurately to resolve coefficient.Further, according to moment of torsion resolve coefficient obtain system requirements moment of torsion and the actual output torque of motor also more accurate.By inputting more accurately for moment of torsion controlling functions provides, improve the dynamic response of car load and the precision of moment of torsion control.
Accompanying drawing explanation
In order to make content of the present invention be more likely to be clearly understood, below according to a particular embodiment of the invention and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is the schematic diagram of the moment of torsion analytic method of a kind of electronlmobil in prior art;
Fig. 2 is the schematic diagram of the torque correction factor method of calculating of a kind of electronlmobil of one embodiment of the invention;
Fig. 3 is the schematic diagram of the moment of torsion analytic method of a kind of electronlmobil of one embodiment of the invention;
Fig. 4 is that the moment of torsion of the electronlmobil of one embodiment of the invention resolves coefficient correction result schematic diagram;
Fig. 5 is the torque correction factor computing system of a kind of electronlmobil of one embodiment of the invention;
Fig. 6 is the moment of torsion resolution system of a kind of electronlmobil of one embodiment of the invention.
Detailed description of the invention
The invention provides specific embodiment and relate generally to two aspects.Wherein a part of embodiment relates to the torque correction factor how calculating electronlmobil, and another part embodiment relates to how obtaining system requirements moment of torsion according to torque correction factor.
embodiment 1
The present embodiment provides a kind of torque correction factor method of calculating of electronlmobil, as shown in Figure 2, comprises the steps:
S1: obtain system status parameters, described system status parameters comprises motor speed, acceleration pedal aperture, the speed of a motor vehicle and system failure grade.
S2: according to the described speed of a motor vehicle and described system failure grade determination revision level with revise initial point.
S3: according to described revision level and described motor speed determination torque correction factor.
Wherein, system status parameters described in step S1, refers to the Full Vehicle System state parameter of electronlmobil.Except comprising motor speed, acceleration pedal aperture, the speed of a motor vehicle and system failure grade, Brake energy recovery state, ABS mode of operation etc. can also be comprised.Coefficient of correction when moment of torsion is resolved can be obtained according to above-mentioned four systems state parameter in the present embodiment.
In step s 2, revise initial point and refer to the initial pedal aperture that moment of torsion parsing coefficient is revised.In the present embodiment, utilize the speed of a motor vehicle and the positive grade classification table of system failure social estate system periodical repair, as shown in table 1.The described speed of a motor vehicle obtained according to step S1 and described system failure grade utilize look-up table determination revision level and revise initial point.
Table 1 revision level classification scheme
As shown in table 1, n
1, n
2, n
3for acceleration pedal opening value, represent with percentum, for different fault levels, revise from different acceleration pedal opening values respectively and resolve moment of torsion.Such as system failure grade is 0 grade, and the speed of a motor vehicle is V
1time, revision level is 0, revise initial point without, now torque correction factor is 1.System failure grade is 2 grades, and the speed of a motor vehicle is V
3time, revision level is 8, when acceleration pedal aperture is n
2in time, starts to revise moment of torsion parsing coefficient.For the fault level related in table 1, be divide according to the order of severity of fault, in national standard, have clear and definite regulation for the order of severity of the various faults in electronlmobil.And the fault level in the present embodiment is not equal to the order of severity of fault.Such as, a certain fault itself belongs to very serious rank, and when so only there is this fault, fault level just may be very high.And some fault itself is not very serious, but occurred a lot of not serious fault, the fault level integrated also may be very high.In the present embodiment, fault level division methods is with reference to ISO26262 standard.
After determining fault level, the speed of a motor vehicle directly to obtain from the control system of electronlmobil in real time.From table 1, directly can determine revision level and revise initial point.As a kind of implementation, the parameters in table 1 can select following value: V1=50KM/ hour, V2=40KM/ hour, V3=30KM/ hour, V4=20KM/ hour, V5=10KM/ hour, n1=30%, n2=40%, n3=50%.Below a kind of specific embodiment is just provided, but those skilled in the art should be understood that table 1 be in Selecting parameter be the empirical value obtained in real-time running state according to electronlmobil, and by carrying out after test of many times constantly adjusting the result obtained, parameter is not changeless.
Further, in step S3, revision level and motor speed is utilized to formulate torque correction factor table, as shown in table 2.Look-up table determination torque correction factor is utilized according to the described motor speed obtained in the described revision level obtained in step S2 and step S1.Obviously, therefrom directly torque correction factor can be found according to the content recorded in table 2.Such as rotating speed be 1000rpm, revision level be 1 time, corresponding coefficient of correction is 0.9, and coefficient of correction can be demarcated.The bivariate table provided in table 2, wherein revision level, motor speed and torque correction factor have well-determined corresponding relation.Therefore, after wherein both determine, corresponding torque correction factor can be found directly and accurately.
Table 2 torque correction factor table
When the speed of a motor vehicle is different with fault level, and when acceleration pedal aperture is identical, adopt the above-mentioned steps in the present embodiment can obtain different torque correction factors.Therefore, adopt the such scheme in the present embodiment, considering outside motor speed and acceleration pedal aperture, the speed of a motor vehicle and fault level are also considered to determine torque correction factor and to revise initial point, the demand torque of update the system parsing in real time, for the actual output torque of motor provide more accurately, more fully Consideration, improve the moment of torsion control accuracy of car load.
As shown in Figure 4, give moment of torsion and resolve coefficient correction result schematic diagram, under three kinds of different system status parameters, to revise initial point be acceleration pedal aperture is 20%, and three torque correction factors obtained are respectively a
1, a
2, a
3, wherein, the coefficient of correction of triangle mark correspondence is a
1, the coefficient of correction of square mark correspondence is a
2, the coefficient of correction of rhombus mark correspondence is a
3.By the result shown in Fig. 3, sufficient proof, under different state of the system, resolving the system requirements moment of torsion obtained is the value changed with state variation.By the such scheme in the present embodiment, the moment of torsion parsing coefficient of more proper electronlmobil practical operation situation can be obtained for different system status parameters, thus system requirements moment of torsion more accurately can be obtained, the actual output torque of the motor obtained further is also more accurate.
embodiment 2
The present embodiment provides a kind of moment of torsion analytic method of electronlmobil, as shown in Figure 3, comprises the steps:
W1: the torque correction factor method of calculating of the electronlmobil according to embodiment 1, obtains the torque correction factor of electronlmobil;
W2: resolve coefficient according to described torque correction factor and moment of torsion and obtain revised moment of torsion and resolve coefficient.
In step W2, the method obtaining revised moment of torsion parsing coefficient according to torque correction factor and moment of torsion parsing coefficient can have a variety of, and according to the electronlmobil of different situations, its correcting mode adopted also may be different.Resolve after coefficient obtaining revised moment of torsion, can verify result, in proof procedure, compute mode be adjusted, the correcting mode of the running condition that finally obtains gearing to actual circumstances.In the present embodiment, obtain revised moment of torsion after resolving multiplication by torque correction factor and moment of torsion and resolve coefficient.
In the present embodiment, in step W2, the acquisition that moment of torsion resolves coefficient is identical with the technical scheme adopted in prior art, determines according to described motor speed and described acceleration pedal aperture.Or direct built-in acquisition moment of torsion resolves the algorithm of coefficient in battery management system or in entire car controller, directly coefficient can be resolved by output torque.
As preferred technical scheme, after obtaining revised moment of torsion and resolving coefficient, in the present embodiment, also comprise the steps: W3 further: resolve coefficient according to system maximum available torque and revised moment of torsion and obtain system requirements moment of torsion.Resolve multiplication by system maximum available torque and revised moment of torsion and obtain system requirements moment of torsion.System maximum available torque is maximum permissible torque according to motor, the maximum discharge power of battery and maximum charge power are determined.
By the such scheme in the present embodiment, because the different conditions considering Full Vehicle System is on the impact of resolving torque coefficient, thus can obtain and resolve torque coefficient more accurately, relative to the actual output torque that can obtain system requirements moment of torsion and motor more accurately prior art, improve the precision that the dynamic response of car load and moment of torsion control.
embodiment 3
The present embodiment provides a kind of torque correction factor computing system of electronlmobil, as shown in Figure 5, comprises parameter acquisition module, the first correcting module, the second correcting module.Wherein, described parameter acquisition module, for obtaining system status parameters, described system status parameters comprises motor speed, acceleration pedal aperture, the speed of a motor vehicle and system failure grade.Described first correcting module, according to parameter acquisition module obtain the speed of a motor vehicle and failure system grade determination revision level and revise initial point.Described second correcting module, the revision level obtained according to described first correcting module and motor speed determination torque correction factor.
Wherein, the described system status parameters that described parameter acquisition module obtains, refers to the Full Vehicle System state parameter of electronlmobil.Adopt said system state parameter can obtain torque correction factor accurately in the present embodiment.In described first correcting module, store the revision level classification scheme utilizing the speed of a motor vehicle and system failure grade to formulate in described first correcting module, the described speed of a motor vehicle obtained according to parameter acquisition module and described system failure grade utilize look-up table determination revision level and revise initial point.Described revision level classification scheme refers to table 1.
Further, store in described second correcting module and utilize revision level and motor speed to formulate torque correction factor table, the described motor speed that the described revision level obtained according to the first correcting module and parameter acquisition module obtain utilizes look-up table determination torque correction factor.Wherein, described torque correction factor table refers to table 2.
When the speed of a motor vehicle is different with fault level, and when acceleration pedal aperture is identical, adopt the such scheme in the present embodiment can obtain different torque correction factors.Due to the such scheme in the present embodiment, considering outside motor speed and acceleration pedal aperture, the speed of a motor vehicle and fault level are also considered to determine torque correction factor and to revise initial point, the demand torque of update the system parsing in real time, for the actual output torque of motor provide more accurately, more fully Consideration, improve the moment of torsion control accuracy of car load.
embodiment 4
The present embodiment provides a kind of moment of torsion resolution system of electronlmobil, as shown in Figure 6, utilize the torque correction factor computing system of the electronlmobil described in embodiment 3, obtain the torque correction factor of electronlmobil, also comprise: the first computing module, resolve coefficient according to described torque correction factor and moment of torsion and obtain revised moment of torsion and resolve coefficient.
When implementing the such scheme in the present embodiment, in described first computing module, the method obtaining revised moment of torsion parsing coefficient according to torque correction factor and moment of torsion parsing coefficient can have a variety of, in the present embodiment, obtain revised moment of torsion after resolving multiplication by torque correction factor and moment of torsion and resolve coefficient.The acquisition that moment of torsion wherein resolves coefficient is identical with the technical scheme adopted in prior art, determines according to described motor speed and described acceleration pedal aperture.Or direct built-in acquisition moment of torsion resolves the algorithm of coefficient in battery management system or in entire car controller, directly coefficient can be resolved by output torque.
As preferred technical scheme, the present embodiment also comprises: the second computing module, resolves coefficient obtain system requirements moment of torsion according to system maximum available torque and revised moment of torsion.Resolve multiplication by system maximum available torque and revised moment of torsion and obtain system requirements moment of torsion.System maximum available torque is maximum permissible torque according to motor, the maximum discharge power of battery and maximum charge power are determined.
By the such scheme in the present embodiment, because the different conditions considering Full Vehicle System is on the impact of resolving torque coefficient, thus can obtain and resolve torque coefficient more accurately, relative to the actual output torque that can obtain system requirements moment of torsion and motor more accurately prior art, improve the precision that the dynamic response of car load and moment of torsion control.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among the protection domain of the invention.
Claims (10)
1. a torque correction factor method of calculating for electronlmobil, is characterized in that, comprise the steps:
S1: obtain system status parameters, described system status parameters comprises motor speed, acceleration pedal aperture, the speed of a motor vehicle and system failure grade;
S2: according to the described speed of a motor vehicle and described system failure grade determination revision level with revise initial point;
S3: according to described revision level and described motor speed determination torque correction factor.
2. the torque correction factor method of calculating of electronlmobil according to claim 1, is characterized in that, the detailed process of step S2 is as follows:
Utilize the speed of a motor vehicle and the positive grade classification table of system failure social estate system periodical repair, the described speed of a motor vehicle obtained according to step S1 and described system failure grade utilize look-up table determination revision level and revise initial point.
3. the torque correction factor method of calculating of electronlmobil according to claim 1 and 2, is characterized in that, in step S2:
Described correction initial point refers to the initial pedal aperture revised moment of torsion parsing coefficient.
4., according to the torque correction factor method of calculating of the arbitrary described electronlmobil of claim 1-3, it is characterized in that, the detailed process of step S3 is as follows:
Utilize revision level and motor speed to formulate torque correction factor table, utilize look-up table determination torque correction factor according to the described motor speed obtained in the described revision level obtained in step S2 and step S1.
5. a moment of torsion analytic method for electronlmobil, is characterized in that, comprise the steps:
W1: according to the torque correction factor method of calculating of the arbitrary described electronlmobil of claim 1-4, obtain the torque correction factor of electronlmobil;
W2: resolve coefficient according to described torque correction factor and moment of torsion and obtain revised moment of torsion and resolve coefficient.
6. a torque correction factor computing system for electronlmobil, is characterized in that, comprising:
Parameter acquisition module, for obtaining system status parameters, described system status parameters comprises motor speed, acceleration pedal aperture, the speed of a motor vehicle and system failure grade;
First correcting module, according to parameter acquisition module obtain the speed of a motor vehicle and failure system grade determination revision level and revise initial point;
Second correcting module, the revision level obtained according to described first correcting module and motor speed determination torque correction factor.
7. the torque correction factor computing system of electronlmobil according to claim 6, is characterized in that,
Store the revision level classification scheme utilizing the speed of a motor vehicle and system failure grade to formulate in described first correcting module, the described speed of a motor vehicle obtained according to parameter acquisition module and described system failure grade utilize look-up table determination revision level and revise initial point.
8. the torque correction factor computing system of the electronlmobil according to claim 6 or 7, is characterized in that,
In described first correcting module, described correction initial point refers to the initial pedal aperture revised moment of torsion parsing coefficient.
9., according to the torque correction factor computing system of the arbitrary described electronlmobil of claim 6-8, it is characterized in that,
Store in described second correcting module and utilize revision level and motor speed to formulate torque correction factor table, the described motor speed that the described revision level obtained according to the first correcting module and parameter acquisition module obtain utilizes look-up table determination torque correction factor.
10. a moment of torsion resolution system for electronlmobil, is characterized in that, comprising the torque correction factor computing system of the arbitrary described electronlmobil of claim 6-9, for obtaining the torque correction factor of electronlmobil, also comprising:
First computing module, resolves coefficient according to described torque correction factor and moment of torsion and obtains revised moment of torsion and resolve coefficient.
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| CN112378559A (en) * | 2020-11-09 | 2021-02-19 | 延边国泰新能源汽车有限公司 | Method for analyzing torque of pedal opening by VCU of automobile |
| CN112378559B (en) * | 2020-11-09 | 2022-03-29 | 延边国泰新能源汽车有限公司 | Method for analyzing torque of pedal opening by VCU of automobile |
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