CN102735907A - Dual-Hall current sensor detection system and method used for electric vehicle - Google Patents
Dual-Hall current sensor detection system and method used for electric vehicle Download PDFInfo
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- CN102735907A CN102735907A CN2012102351516A CN201210235151A CN102735907A CN 102735907 A CN102735907 A CN 102735907A CN 2012102351516 A CN2012102351516 A CN 2012102351516A CN 201210235151 A CN201210235151 A CN 201210235151A CN 102735907 A CN102735907 A CN 102735907A
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- current sensor
- hall current
- igbt module
- electric vehicle
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Abstract
The invention provides a dual-Hall current sensor detection system and method used for an electric vehicle. A battery pack anode is connected with the input end of a first Hall current sensor; the output end of the first Hall current sensor is divided into two paths; one path is successively connected with a second Hall current sensor and a second IGBT module; the other path is connected with a first IGBT (Insulated Gate Bipolar Translator) module; after being joined, the two paths are connected to a battery pack cathode; a first measurement unit and a second measurement unit are respectively connected with the first Hall current sensor and the second Hall current sensor; the output end of the first measurement unit and the output end of the second measurement unit are respectively connected with a microprocessor; and the output end of the microprocessor is respectively connected with the control ends of the first IGBT module and the second IGBT module by a first driving protection circuit and a second driving protection circuit. A method that the Hall current sensors of different ranges are mutually switched is adopted, the small-range Hall current sensor is selected under starting and cruising state, and a big-range Hall current sensor is selected at an accelerating range. Therefore, the electric vehicle measurement precision is improved, and the cost is lowered.
Description
Technical field
The invention belongs to a kind of series connection power supply current sensing means, is a kind of pick-up unit system and method that adopts two Hall current sensors to realize monitoring electric automobile electric current.
Background technology
Pollution-free when adopting power battery pack to work as the pure electric automobile of car load drive energy, zero-emission will obtain application more and more widely.Electric automobile exist start, quicken, cruise, different operating state such as braking; And vehicle mounted dynamic battery group when work electric current changes greatly; Possibly reach peaces up to a hundred at anxious boost phase electric current; Then only in tens peaces, tradition is sampled to the electrokinetic cell working current and is often adopted the Hall current sensor of 1 wide range, little current sample is not so good as to choose the Hall current sensor of suitable little range at the cruising phase electric current.Adopt Hall current sensor to measure to start, quicken, cruise, the precision of the batteries of electric automobile electric current of different operating state such as braking is not high, and employing wide range, high-precision hall current sensor cost are higher.
Summary of the invention
The technical matters that the present invention will solve is: two Hall current sensor detection systems of a kind of used for electric vehicle and method are provided; Adopt the mutual changing method of the Hall current sensor of different ranges; Improve the precision of electric automobile current measurement, reduce and use the required cost of high-precision sensor.
The present invention solves the problems of the technologies described above the technical scheme of being taked to be: the two Hall current sensor detection systems of a kind of used for electric vehicle; It is characterized in that: the positive pole of electric battery is connected with the input end of first Hall current sensor; The output terminal of first Hall current sensor is divided into two-way; One the tunnel connects second Hall current sensor and the 2nd IGBT module successively, and another road connects an IGBT module, is linked into the negative pole of said electric battery after two-way converges again; First, second measuring unit is connected with first, second Hall current sensor respectively and obtains sampled value; And the output terminal of first, second measuring unit is connected with microprocessor respectively, and the output terminal of microprocessor is connected with the control end of first, second IGBT module respectively through first, second Drive Protecting Circuit; The range of first Hall current sensor is greater than second Hall current sensor.
Press such scheme, described first Hall current sensor is the wide range Hall current sensor, its maximum range I
Amax=1.5*I
a, I
aAccessibility lowest high-current value when being in boost phase for automobile; Described second Hall current sensor is an a small amount of journey Hall current sensor, and its maximum range is I
Bmax=1.5*I
b, I
bFor automobile is in accessibility lowest high-current value when starting with cruising phase at the uniform velocity.
Press such scheme, described first, second measuring unit is made up of current/voltage modular converter and A/D modular converter respectively.
The two Hall current sensor detection methods of a kind of used for electric vehicle, it is characterized in that: it may further comprise the steps:
1) adopts the two Hall current sensor detection systems of used for electric vehicle, during automobile starting, control an IGBT module conducting, control the 2nd IGBT module through second Drive Protecting Circuit and break off through first Drive Protecting Circuit;
2) microprocessor obtains the electric battery working current i by the detection of first Hall current sensor through first measuring unit
a, work as i
aLess than i
1The time, break off an IGBT module, conducting the 2nd IGBT module;
3) when IGBT module disconnection and the 2nd IGBT module conducting, microprocessor obtains the electric battery working current i by the detection of second Hall current sensor through second measuring unit
b, work as i
bMore than or equal to i
2The time, break off the 2nd IGBT module, conducting the one IGBT module;
i
1, i
2Be setting value, and i
1<i
2
Rule of thumb value can be set: described i
1=0.7I
Bmax, i
2=0.9I
Bmax, I wherein
BmaxIt is the maximum range of second Hall current sensor.
Beneficial effect of the present invention is:
1, electric automobile exist starts, quicken, cruise, different operating state such as braking, the unloading phase and cruising phase, the electric current of automobile batteries is lower, so the Hall current sensor that detects these two stages can be selected the Hall current sensor of little range; At boost phase, the electric current of automobile batteries is higher, therefore detects the Hall current sensor that this stage Hall current sensor can be selected wide range; Therefore, adopt the mutual changing method of the Hall current sensor of different ranges, improve the precision of electric automobile current measurement, reduce and use the required cost of high-precision sensor.
2, this method is carried out certain surplus setting when the conducting of setting first, second IGBT module and disconnection decision content, can form the ring that stagnates, and prevents that IGBT from switching damage equipment repeatedly in this value.
Description of drawings
Fig. 1 is the structured flowchart of one embodiment of the invention.
Fig. 2 is the control flow chart of one embodiment of the invention.
Embodiment
Fig. 1 is the structured flowchart of one embodiment of the invention; The positive pole of electric battery 1 is connected with the input end of first Hall current sensor 3; The output terminal of first Hall current sensor 3 is divided into two-way; One the tunnel connects second Hall current sensor 4 and the 2nd IGBT module 5 successively, and another road connects an IGBT module 2, is linked into the negative pole of said electric battery 1 after two-way converges again; First, second measuring unit is connected with first, second Hall current sensor (3,4) respectively and obtains sampled value; And the output terminal of first, second measuring unit is connected with microprocessor MCU respectively, and the output terminal of microprocessor MCU is connected with the control end of first, second IGBT module (2,5) respectively through first, second Drive Protecting Circuit.Wherein first, second measuring unit is made up of current/voltage modular converter and A/D modular converter respectively.
First, second measuring unit is handled the sampled value of first, second Hall current sensor respectively; Microprocessor MCU is after obtaining sampled value; Through judging; Go to control shutoff and the conducting that first, second Drive Protecting Circuit realizes first, second IGBT module, thereby switch the Hall current sensor that uses two different ranges, satisfy accuracy of detection and requirement that vehicle quickens the big electric current and the little electric current that cruises.
If the range of first Hall current sensor is 0 to I
Amax, the range of second Hall current sensor is 0 to I
BmaxFirst Hall current sensor is the wide range Hall current sensor, its maximum range I
Amax=1.5*I
a, I
aAccessibility lowest high-current value when being in boost phase for automobile; Described second Hall current sensor is an a small amount of journey Hall current sensor, its maximum range I
Bmax=1.5*I
b, I
bFor automobile is in accessibility lowest high-current value when starting with cruising phase at the uniform velocity.
The two Hall current sensor detection methods of used for electric vehicle are as shown in Figure 2; After electric automobile starts; MCU controls an IGBT module conducting through first Drive Protecting Circuit; Control the 2nd IGBT module through second Drive Protecting Circuit and break off, then the electric battery working current is detected by first Hall current sensor, and MCU obtains electric battery working current i through first measuring unit
a(obtaining), and the current i that detection is obtained by first Hall current sensor
aWith 0.7I
BmaxCompare and control first, second IGBT module shuts down situation: work as i
aLess than 0.7I
BmaxThe time; Break off an IGBT module, conducting the 2nd IGBT module makes tested electric current simultaneously through first, second Hall current sensor; In order to obtain more precisely electric battery working current, MCU obtains the current value i that second Hall current sensor of little range records through second measuring unit
b, the current i of while MCU through detection is obtained
bWith 0.9I
BmaxCompare the shutoff situation of controlling first, second IGBT module: work as i
bMore than or equal to 0.9I
BmaxThe time, break off the 2nd IGBT module, conducting the one IGBT module.Certain surplus setting is carried out in the conducting of first, second IGBT module and the non-same value of disconnection decision content, can form the ring that stagnates.Prevent that IGBT from switching damage equipment repeatedly in this value.
The content of not doing in this instructions to describe in detail belongs to this area professional and technical personnel's known prior art.
Claims (5)
1. two Hall current sensor detection systems of a used for electric vehicle; It is characterized in that: the positive pole of electric battery is connected with the input end of first Hall current sensor; The output terminal of first Hall current sensor is divided into two-way; One the tunnel connects second Hall current sensor and the 2nd IGBT module successively, and another road connects an IGBT module, is linked into the negative pole of said electric battery after two-way converges again; First, second measuring unit is connected with first, second Hall current sensor respectively and obtains sampled value; And the output terminal of first, second measuring unit is connected with microprocessor respectively, and the output terminal of microprocessor is connected with the control end of first, second IGBT module respectively through first, second Drive Protecting Circuit; The range of first Hall current sensor is greater than second Hall current sensor.
2. the two Hall current sensor detection systems of used for electric vehicle according to claim 1, it is characterized in that: described first Hall current sensor is the wide range Hall current sensor, its maximum range I
Amax=1.5*I
a, I
aAccessibility lowest high-current value when being in boost phase for automobile; Described second Hall current sensor is an a small amount of journey Hall current sensor, and its maximum range is I
Bmax=1.5*I
b, I
bFor automobile is in accessibility lowest high-current value when starting with cruising phase at the uniform velocity.
3. the two Hall current sensor detection systems of used for electric vehicle according to claim 1, it is characterized in that: described first, second measuring unit is made up of current/voltage modular converter and A/D modular converter respectively.
4. two Hall current sensor detection methods of a used for electric vehicle, it is characterized in that: it may further comprise the steps:
1) adopts the two Hall current sensor detection systems of used for electric vehicle, during automobile starting, control an IGBT module conducting, control the 2nd IGBT module through second Drive Protecting Circuit and break off through first Drive Protecting Circuit;
2) microprocessor obtains the electric battery working current i by the detection of first Hall current sensor through first measuring unit
a, work as i
aLess than i
1The time, break off an IGBT module, conducting the 2nd IGBT module;
3) when IGBT module disconnection and the 2nd IGBT module conducting, microprocessor obtains the electric battery working current i by the detection of second Hall current sensor through second measuring unit
b, work as i
bMore than or equal to i
2The time, break off the 2nd IGBT module, conducting the one IGBT module;
i
1, i
2Be setting value, and i
1<i
2
5. the two Hall current sensor detection methods of used for electric vehicle according to claim 4 is characterized in that: described i
1=0.7I
Bmax, i
2=0.9I
Bmax, I wherein
BmaxIt is the maximum range of second Hall current sensor.
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| CN2012102351516A CN102735907A (en) | 2012-07-09 | 2012-07-09 | Dual-Hall current sensor detection system and method used for electric vehicle |
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| CN2012102351516A CN102735907A (en) | 2012-07-09 | 2012-07-09 | Dual-Hall current sensor detection system and method used for electric vehicle |
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| CN105068014A (en) * | 2015-08-28 | 2015-11-18 | 江苏大学 | Parallel single cell performance monitoring system and monitoring method |
| CN105301336A (en) * | 2015-09-30 | 2016-02-03 | 安徽江淮汽车股份有限公司 | Two-channel current sensor-based signal acquisition and fault diagnosis method |
| CN107918105A (en) * | 2016-10-05 | 2018-04-17 | 法可特里亚股份有限公司 | Current measuring device |
| CN110658465A (en) * | 2019-11-01 | 2020-01-07 | 四川长虹电器股份有限公司 | Cadmium-nickel battery management system |
| CN113466772A (en) * | 2021-06-30 | 2021-10-01 | 安徽江淮汽车集团股份有限公司 | Current detection correction method based on Hall current sensor |
| CN115955060A (en) * | 2023-02-14 | 2023-04-11 | 中国科学院宁波材料技术与工程研究所 | Method and system for improving low-current running current resolution of high-power rim motor |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105068014A (en) * | 2015-08-28 | 2015-11-18 | 江苏大学 | Parallel single cell performance monitoring system and monitoring method |
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| CN115955060A (en) * | 2023-02-14 | 2023-04-11 | 中国科学院宁波材料技术与工程研究所 | Method and system for improving low-current running current resolution of high-power rim motor |
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Application publication date: 20121017 |