CN111751726A - Automobile electronic water pump idle running detection method - Google Patents
Automobile electronic water pump idle running detection method Download PDFInfo
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- CN111751726A CN111751726A CN202010645228.1A CN202010645228A CN111751726A CN 111751726 A CN111751726 A CN 111751726A CN 202010645228 A CN202010645228 A CN 202010645228A CN 111751726 A CN111751726 A CN 111751726A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 238000001514 detection method Methods 0.000 title abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 14
- 230000009466 transformation Effects 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 3
- 230000001131 transforming effect Effects 0.000 claims description 3
- 238000004146 energy storage Methods 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 230000000007 visual effect Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 101000841267 Homo sapiens Long chain 3-hydroxyacyl-CoA dehydrogenase Proteins 0.000 description 1
- 102100029107 Long chain 3-hydroxyacyl-CoA dehydrogenase Human genes 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- JJYKJUXBWFATTE-UHFFFAOYSA-N mosher's acid Chemical compound COC(C(O)=O)(C(F)(F)F)C1=CC=CC=C1 JJYKJUXBWFATTE-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention provides an automobile electronic water pump idle running detection method, which is characterized in that three-phase stator currents are converted into a virtual two-axis αβ coordinate system, and the currents I are converted by using Park conversionαAnd IβConverted into an electric current IdAnd Iq(ii) a And then estimating the angle theta of the motor rotor and the rotating speed omega of the motor rotor through a position estimation modelr(ii) a Calculating the actual torque output of the motor according to a motor electromagnetic torque formula; calculating the electromagnetic torque T of the motor once in each electric period in the running process of the motoreAnd will be
With reference value σ0Comparing and judging the motorAnd if the water pump is in an idle state, executing a water pump idle protection strategy. The invention can detect whether the water pump is in an idle state in the whole process of starting and running of the electronic water pump, thereby preventing the water pump from being worn and invalid; compared with the traditional method, the heating power and the energy storage power of the motor in a power and current equation are removed, the detection precision is improved through the judgment of the electromagnetic torque output value, and the torque understanding is simpler and more visual.
Description
Technical Field
The invention relates to an automobile electronic water pump idle running detection method, and belongs to the field of electronic water pump driving.
Background
Energy conservation and emission reduction are development directions of automobile industries all the time, along with the development of technologies, the whole automobile and parts are gradually electronized, and a water pump is used as a part of automobile heat management and is also developed from a mechanical type to an electronic type. The automobile electronic water pump adopts a high-power-density three-phase permanent magnet synchronous motor, and a position sensor is not arranged in the motor, so that the automobile electronic water pump is small in size and high in power density, and is widely used in the field of automobile water pumps.
When the water pump works and liquid leakage occurs in a pipeline or the pressure of a water inlet is insufficient, the water pump motor can idle due to the fact that no refrigerating liquid exists in the water pump motor. When idling, the motor rotor is in direct contact with the shaft, and under the condition of high-speed rotation, the motor shaft can be quickly abraded to cause the water pump to lose efficacy, so that a method capable of detecting the idling state of the water pump is needed at the driving end of the water pump.
The traditional method judges the idle state by setting the effective value range of the motor power or current, and has the defects that the heating power and the energy storage power in the motor are not considered, the current is a characteristic quantity, the actual output of the motor is torque, and the judgment precision is not high.
Disclosure of Invention
In order to improve the precision of the idle detection of the automobile electronic water pump and prevent error diagnosis, the invention provides the idle detection method of the automobile electronic water pump.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an automobile electronic water pump idle running detection method comprises the following specific steps:
s1, obtaining stator three-phase current through current sampling;
s2 transforming the three-phase stator current to a virtual two-axis αβ coordinate system by Clark transformation to respectively obtain current IαAnd Iβ；
S3 utilizes Park transformation to convert the current I under a virtual two-axis αβ coordinate systemαAnd IβConverted into current I under rotor magnetic field dq coordinate systemdAnd Iq；
S4 estimating the motor rotor angle theta and the motor rotor rotation speed omega through a position estimation modelr；
S5, calculating the actual torque output of the motor according to the motor electromagnetic torque formula;
s6 testing the electromagnetic torque T in the idle state of the motor0With the speed of rotation omega0Since the motor torque is proportional to the square of the rotational speed, let the reference value
S7 motor electromagnetic torque T is calculated once in each electric cycle in the motor operation processeAnd will be
And σ0Making a comparison when
If yes, judging that the motor is in an idle state, performing step S8, otherwise, returning to step S1;
s8 implements a water pump idle protection strategy.
Preferably, in S5, the motor electromagnetic torque formula is as shown in formula (1):
in the formula, TeIs the electromagnetic torque of the motor, n is the ratio of the electrical period to the mechanical period,. phirIs the rotor magnetic field strength, LdAnd LqInductance of d-and q-axes of the machine, respectively, wherer，Ld，LqN isThe motor intrinsic parameters.
Has the advantages that: the invention provides an automobile electronic water pump idle running detection method, which has the following advantages compared with the prior art:
1. the invention can detect whether the water pump is in an idle state in the whole process of starting and running of the electronic water pump, thereby preventing the water pump from being worn and invalid;
2. the invention is converted into passing rotation speed omega by the original method of passing power and currentrAnd electromagnetic output torque TeCompared with the traditional method, the method has the advantages that the heating power and the energy storage power of the motor in the power and current equation are removed, the detection precision is improved through the judgment of the electromagnetic torque output value, and the torque understanding is simpler and more visual;
3. the invention is suitable for surface-mounted permanent magnet synchronous motors, namely LdAnd LqWith embedded permanent-magnet synchronous machines, i.e. Ld<Lq；
4. The invention is applicable tod0 current control strategy and MTPA current-per-ampere maximum torque control strategy.
Drawings
Fig. 1 is a flow chart illustrating an idle state diagnosis of an electronic water pump according to the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
An automobile electronic water pump idle running detection method comprises the following specific steps:
s1, obtaining stator three-phase current through current sampling;
s2 transforming the three-phase stator current to a virtual two-axis αβ coordinate system by Clark transformation to respectively obtain current IαAnd Iβ；
S3 utilizes Park transformation to convert the current I under a virtual two-axis αβ coordinate systemαAnd IβConverted into current I under rotor magnetic field dq coordinate systemdAnd Iq；
S4 estimating the motor rotor angle theta and the motor rotor rotation speed omega through a position estimation modelr；
S5, calculating the actual torque output of the motor according to the motor electromagnetic torque formula;
s6 testing the electromagnetic torque T in the idle state of the motor0With the speed of rotation omega0Since the motor torque is proportional to the square of the rotational speed, let the reference value
S7 motor electromagnetic torque T is calculated once in each electric cycle in the motor operation processeAnd will be
And σ0Making a comparison when
If so, judging that the motor is in an idle state, then performing step S8, otherwise, returning to step S1;
s8 implements a water pump idle protection strategy.
Preferably, in S5, the motor electromagnetic torque formula is as shown in formula (1):
in the formula, TeIs the electromagnetic torque of the motor, n is the ratio of the electrical period to the mechanical period,. phirIs the rotor magnetic field strength, LdAnd LqInductance of d-and q-axes of the machine, respectively, wherer，Ld，LqAnd n is an inherent parameter of the motor.
The "Clark transformation", "Park transformation" and "position estimation model" referred to in the present invention are conventional techniques known to those skilled in the art, and thus are not described in detail.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (2)
1. The method for detecting the idling of the automobile electronic water pump is characterized by comprising the following specific steps of:
s1, obtaining stator three-phase current through current sampling;
s2 transforming the three-phase stator current to a virtual two-axis αβ coordinate system by Clark transformation to respectively obtain current IαAnd Iβ；
S3 utilizes Park transformation to convert the current I under a virtual two-axis αβ coordinate systemαAnd IβConverted into current I under rotor magnetic field dq coordinate systemdAnd Iq；
S4 estimating the motor rotor angle theta and the motor rotor rotation speed omega through a position estimation modelr；
S5, calculating the actual torque output of the motor according to the motor electromagnetic torque formula;
s6 testing the electromagnetic torque T in the idle state of the motor0With the speed of rotation omega0Since the motor torque is proportional to the square of the rotational speed, let the reference value
S7 motor electromagnetic torque T is calculated once in each electric cycle in the motor operation processeAnd will be
And σ0Making a comparison when
If yes, judging that the motor is in an idle state, performing step S8, otherwise, returning to step S1;
s8 implements a water pump idle protection strategy.
2. The method for detecting the idle running of the automobile electronic water pump according to claim 1, wherein in the step S5, the electromagnetic torque formula of the motor is shown in formula (1):
in the formula, TeIs the electromagnetic torque of the motor, n is the ratio of the electrical period to the mechanical period,. phirIs the rotor magnetic field strength, LdAnd LqInductance of d-and q-axes of the machine, respectively, wherer，Ld，LqAnd n is an inherent parameter of the motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010645228.1A CN111751726A (en) | 2020-07-07 | 2020-07-07 | Automobile electronic water pump idle running detection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010645228.1A CN111751726A (en) | 2020-07-07 | 2020-07-07 | Automobile electronic water pump idle running detection method |
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| CN111751726A true CN111751726A (en) | 2020-10-09 |
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| CN202010645228.1A Pending CN111751726A (en) | 2020-07-07 | 2020-07-07 | Automobile electronic water pump idle running detection method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1358273A (en) * | 2000-03-27 | 2002-07-10 | 三菱电机株式会社 | Sensor for sensing rotating state of synchronous machine and mehtod of sensing rotating state of synchronous machine |
| CN102158145A (en) * | 2011-03-31 | 2011-08-17 | 苏州士林电机有限公司 | Device and method for detecting and tracking idling speed of motor |
| CN106640691A (en) * | 2016-12-13 | 2017-05-10 | 杭州信多达电器有限公司 | Device and method for water pump fault testing and protecting |
| CN107448398A (en) * | 2017-09-22 | 2017-12-08 | 东莞市深鹏电子有限公司 | A kind of method for detecting DC water pump running status |
| CN107681943A (en) * | 2017-11-01 | 2018-02-09 | 合肥巨动力系统有限公司 | A kind of method of estimation of Electric Vehicle's Alternating motor output torque |
-
2020
- 2020-07-07 CN CN202010645228.1A patent/CN111751726A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1358273A (en) * | 2000-03-27 | 2002-07-10 | 三菱电机株式会社 | Sensor for sensing rotating state of synchronous machine and mehtod of sensing rotating state of synchronous machine |
| CN102158145A (en) * | 2011-03-31 | 2011-08-17 | 苏州士林电机有限公司 | Device and method for detecting and tracking idling speed of motor |
| CN106640691A (en) * | 2016-12-13 | 2017-05-10 | 杭州信多达电器有限公司 | Device and method for water pump fault testing and protecting |
| CN107448398A (en) * | 2017-09-22 | 2017-12-08 | 东莞市深鹏电子有限公司 | A kind of method for detecting DC water pump running status |
| CN107681943A (en) * | 2017-11-01 | 2018-02-09 | 合肥巨动力系统有限公司 | A kind of method of estimation of Electric Vehicle's Alternating motor output torque |
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Application publication date: 20201009 |