CN106707152A - Adhesion detection circuit and adhesion detection method for electric automobile power relay - Google Patents
Adhesion detection circuit and adhesion detection method for electric automobile power relay Download PDFInfo
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- CN106707152A CN106707152A CN201611183951.2A CN201611183951A CN106707152A CN 106707152 A CN106707152 A CN 106707152A CN 201611183951 A CN201611183951 A CN 201611183951A CN 106707152 A CN106707152 A CN 106707152A
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- detection
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- power relay
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
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- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses an adhesion detection circuit and an adhesion detection method for an electric automobile power relay. The adhesion detection circuit comprises a detection power supply, a detection resistor, an isolation feedback circuit and a processor, and is characterized in that the detection power supply is connected with the detection resistor and the power relay in series to form a loop and used for applying preset detection voltage when the power relay is disconnected so as to perform detection; the isolation feedback circuit is connected with the detection resistor in parallel and used for acquiring voltage at two ends of the detection resistor and feeding back the voltage to the processor; and the processor is used for judging whether the power relay has adhesion or not according to the fed back voltage. According to the invention, the power relay can be determined to have adhesion if voltage is detected at two ends of the detection resistor under the condition that a closing instruction is not sent to the power relay, so that the judgment condition is simple, complex sampling and calculation are not required to be performed on the detection circuit, a result can be detected timely, and the safety of a power battery and a power control system of an electric automobile is ensured.
Description
Technical field
It is electric the present invention relates to electric vehicle engineering field, more particularly to a kind of adhesion detection of electric automobile power relay
Road and detection method.
Background technology
Electric automobile power relay is between connection electrokinetic cell and motor and controller, electrokinetic cell and charger
Switching device, under various abnormal conditions, disconnecting relay can protect electrokinetic cell and power control system, it is ensured that whole
The operation that vehicle electric system can be circulated safely.Therefore detected the state of relay to vehicle before Vehicular system operation
The operation of safety circulation is most important.But because electric motor starting is frequent, start load weight, and it is often subject to impact load work
With, cause actuating of relay number of times more, easily there is contact adhesion phenomenon, cause potential safety hazard to electric automobile.
The relay status detection method mainly terminal voltage method used in current industry, by measuring relay two ends
Voltage come judge relay whether adhesion or normal.As shown in figure 1, being detected near battery side A points and C points by R1 and R2 partial pressures
Total voltage Vac, then detect the total voltage V near motor and controller side B points and C pointsbc, wherein R1 and R3 is megohm level
Resistance, R2 and R4 is the resistance of kilohm level；By measuring the voltage signal on R2 and R4, and the proportionate relationship of resistance is pushed away
Calculate the size of total voltage.By comparing VacAnd VbcDifference disconnect or close judging the state of relay K1.If
Vac-Vbc≤ k (k is constant, is chosen according to virtual voltage platform), then judge that relay K1 is closure state, otherwise relay K1
It is off-state.According to practical operation situation, if not opening the instruction of closing relay K1, detection finds Vac-Vbc≤ k, i.e.,
Relay is in closure state, then relay K1 adhesions are damaged.But, calculate that total voltage is also easy to produce error by partial pressure,
Need calibration；The difference constant k for comparing needs to select again in different electrokinetic cell voltage platforms, and method of testing is cumbersome；Electricity
When quickly going up electricity again after electricity under machine and its controller, its internal capacitance stores energy causes V within a period of timebcVoltage is still
In the presence of now relatively may result in relay status misjudgment by total voltage.
The content of the invention
A kind of adhesion it is an object of the invention to propose electric automobile power relay detects circuit and detection method, energy
Whether enough power relays for detecting electric automobile in time there is adhesion, it is ensured that the electrokinetic cell and dynamic Control of electric automobile
The safety of system.
It is that, up to this purpose, the present invention uses following technical scheme：
On the one hand, the present invention provides a kind of adhesion detection circuit of electric automobile power relay, including：Detection power supply,
Detection resistance, isolation feedback circuit and processor；
The detection power supply connects to form loop with the detection resistance and power relay, for disconnected in power relay
Apply default detection voltage when opening to be detected；
The isolation feedback circuit is in parallel with the detection resistance, the voltage for obtaining the detection resistance two ends, and
Feed back to the processor；
The processor be used for according to feedback the voltage, judge the power relay whether adhesion.
Wherein, the detection power supply is electric pressure converter；
The input of the electric pressure converter is connected with vehicle-mounted voltage, and one end of output end connects with the power relay
Connect, the other end of output end is connected with the detection resistance, export after default detection voltage for vehicle-mounted voltage to be converted to.
Further, the processor is additionally operable to control the electric pressure converter to open and close.
On the other hand, the present invention also provides a kind of adhesion detection method of electric automobile power relay, using above-mentioned
Adhesion detection circuit is performed, and the detection method includes：
When the power relay disconnects, by the detection power supply export default detection voltage to the power connected after
Electrical equipment and detection resistance；
In the case where relay close command is not carried out, detect whether the detection resistance has electric current to pass through, be then true
The fixed power relay adhesion.
Wherein, detect whether the detection resistance has electric current to pass through, including：
By the isolation feedback circuit in parallel with the detection resistance, the voltage at the detection resistance two ends is obtained；
If the voltage is more than or equal to predetermined threshold value, the detection resistance has electric current to pass through；
The predetermined threshold value is obtained according to the computing the resistor value of the default detection voltage and the detection resistance.
Wherein, default detection voltage to the power relay and detection resistance of series connection, bag are exported by the detection power supply
Include：
After vehicle-mounted voltage to be converted to electric pressure converter default detection voltage, output to series connection power relay and
Detection resistance.
Beneficial effects of the present invention are：
The present invention is not referring to power relay and detection resistance and detection power supply composition loop to power relay closure
In the case of order, if detecting detection resistance two ends has voltage, can determine that adhesion occurs in power relay.The present invention judges bar
Part is simple, it is not necessary to the sampling and computing of complexity are carried out to detection circuit, the power relay of electric automobile can be in time detected
Whether adhesion is occurred, it is ensured that the electrokinetic cell of electric automobile and the safety of power control system.
Brief description of the drawings
Fig. 1 is adhesion detection circuit in the prior art using terminal voltage method.
Fig. 2 is the adhesion detection circuit of the electric automobile power relay that the embodiment of the present invention one is provided.
Fig. 3 is the flow chart of the adhesion detection method of the electric automobile power relay that the embodiment of the present invention two is provided.
Specific embodiment
For make present invention solves the technical problem that, the technical scheme that uses and the technique effect that reaches it is clearer, below
The technical scheme of the embodiment of the present invention will be described in further detail with reference to accompanying drawing, it is clear that described embodiment is only
It is a part of embodiment of the invention, rather than whole embodiments.
Embodiment one
Fig. 2 is the adhesion detection circuit of the electric automobile power relay that the embodiment of the present invention one is provided.As shown in Fig. 2
The present embodiment provides a kind of adhesion detection circuit of electric automobile power relay, the power relay for judging electric automobile
Whether adhesion is occurred.
The adhesion detection circuit includes：Detection power supply 13, detection resistance R5, isolation feedback circuit 12 and processor 11.
It is described detection power supply 13 connect and to form loop with the detection resistance R5 and power relay K2, for power after
Apply default detection voltage when electrical equipment K2 disconnects to be detected.
The isolation feedback circuit 12 is in parallel with the detection resistance R5, the electricity for obtaining the detection resistance R5 two ends
Pressure, and feed back to the processor 11.
The processor 11 be used for according to feedback the voltage, judge the power relay K2 whether adhesion.
Wherein, the detection power supply 13 is electric pressure converter.The input of the electric pressure converter is connected with vehicle-mounted voltage,
One end of output end is connected with the power relay K2, and the other end of output end is connected with the detection resistance R5, for inciting somebody to action
Vehicle-mounted voltage is exported after being converted to default detection voltage.
Or, the detection power supply 13 is the dc source of offer constant voltage, such as low tension battery.The default detection
Voltage is typically relatively low, 5~10V.
Further, the processor 11 is additionally operable to control the electric pressure converter to open and close.
For example, electric pressure converter is DC/DC converters, the vehicle-mounted voltage of the vehicle-mounted storage battery of electric automobile is high from 12V or 24V
Pressure is converted to the output of 5V low pressure.Detection circuit on electricity after, processor 11 do not give power relay K2 close commands in the case of,
Control the electric pressure converter to open and export default detection voltage, if isolation feedback circuit 12 detects detection resistance R5 two ends
Voltage swing answer the size of partial pressure to be consistent with its resistance, then illustrate that detection resistance R5 has electric current to pass through, and then can determine that power
There is adhesion in relay K2.
The present embodiment realizes the adhesion detection of power relay by a simple circuit, and power relay is not being given
In the case of device close command, if detecting detection resistance two ends has voltage, can determine that adhesion occurs in power relay.This reality
Applying example need not carry out the sampling and computing of complexity to detection circuit, can in time detect whether power relay adhesion occurs,
Ensure the electrokinetic cell of electric automobile and the safety of power control system.
Embodiment two
The present embodiment provides a kind of adhesion detection method of electric automobile power relay, using described in above-described embodiment
Adhesion detection circuit is performed, it is adaptable to judge whether the power relay of electric automobile adhesion occurs.
Fig. 3 is the flow chart of the adhesion detection method of the electric automobile power relay that the embodiment of the present invention two is provided.Such as
Shown in Fig. 3, the adhesion detection method comprises the following steps：
S21, when the power relay disconnects, default detection voltage to the work(of series connection is exported by the detection power supply
Rate relay and detection resistance.
After power relay is off-state, or processor control power relay performs open command, by electricity
Vehicle-mounted voltage is converted to default detection voltage by pressure converter, as detection power supply, or provides arbitrary low-voltage dc power supply
As detection power supply, the power relay and detection resistance of output to series connection.
S22, in the case where relay close command is not carried out, detects whether the detection resistance has electric current to pass through, and is
Then determine the power relay adhesion.
By the isolation feedback circuit in parallel with the detection resistance, the voltage at the detection resistance two ends is obtained；If institute
State voltage and be more than or equal to predetermined threshold value, then the detection resistance has electric current to pass through；The predetermined threshold value is according to the default inspection
The computing the resistor value for surveying voltage and the detection resistance is obtained, and is the size that detection resistance answers partial pressure in the loop.
The present embodiment do not give power relay close command in the case of, if detecting detection resistance two ends has voltage,
Then can determine that adhesion occurs in power relay, Rule of judgment is simple, it is not necessary to the sampling and computing of complexity are carried out to detection circuit,
The exception of power relay can in time be detected, it is ensured that the electrokinetic cell of electric automobile and the safety of power control system.
Know-why of the invention is described above in association with specific embodiment.These descriptions are intended merely to explain of the invention
Principle, and can not by any way be construed to limiting the scope of the invention.Based on explanation herein, the technology of this area
Personnel associate other specific embodiments of the invention by would not require any inventive effort, these modes fall within
Within protection scope of the present invention.
Claims (6)
1. the adhesion of a kind of electric automobile power relay detects circuit, it is characterised in that including：Detection power supply, detection resistance,
Isolation feedback circuit and processor；
The detection power supply connects to form loop with the detection resistance and power relay, for when power relay disconnects
Apply default detection voltage to be detected；
The isolation feedback circuit is in parallel with the detection resistance, for obtaining the voltage at the detection resistance two ends, and feeds back
To the processor；
The processor be used for according to feedback the voltage, judge the power relay whether adhesion.
2. adhesion according to claim 1 detects circuit, it is characterised in that：The detection power supply is electric pressure converter；
The input of the electric pressure converter is connected with vehicle-mounted voltage, and one end of output end is connected with the power relay, defeated
The other end for going out end is connected with the detection resistance, export after default detection voltage for vehicle-mounted voltage to be converted to.
3. adhesion according to claim 2 detects circuit, it is characterised in that：
The processor is additionally operable to control the electric pressure converter to open and close.
4. a kind of adhesion detection method of electric automobile power relay, is examined using the adhesion described in any one of claims 1 to 3
Slowdown monitoring circuit is performed, it is characterised in that the detection method includes：
When the power relay disconnects, default detection voltage to the power relay of series connection is exported by the detection power supply
And detection resistance；
In the case where relay close command is not carried out, detect whether the detection resistance has electric current to pass through, be to determine institute
State power relay adhesion.
5. adhesion detection method according to claim 4, it is characterised in that whether the detection detection resistance has electric current to lead to
Cross, including：
By the isolation feedback circuit in parallel with the detection resistance, the voltage at the detection resistance two ends is obtained；
If the voltage is more than or equal to predetermined threshold value, the detection resistance has electric current to pass through；
The predetermined threshold value is obtained according to the computing the resistor value of the default detection voltage and the detection resistance.
6. adhesion detection method according to claim 4, it is characterised in that default detection is exported by the detection power supply
Voltage to series connection power relay and detection resistance, including：
After vehicle-mounted voltage to be converted to electric pressure converter default detection voltage, power relay and detection of the output to series connection
Resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611183951.2A CN106707152A (en) | 2016-12-20 | 2016-12-20 | Adhesion detection circuit and adhesion detection method for electric automobile power relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611183951.2A CN106707152A (en) | 2016-12-20 | 2016-12-20 | Adhesion detection circuit and adhesion detection method for electric automobile power relay |
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| CN106707152A true CN106707152A (en) | 2017-05-24 |
Family
ID=58939343
Family Applications (1)
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| CN201611183951.2A Pending CN106707152A (en) | 2016-12-20 | 2016-12-20 | Adhesion detection circuit and adhesion detection method for electric automobile power relay |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107300670A (en) * | 2017-06-08 | 2017-10-27 | 北京新能源汽车股份有限公司 | Detection circuit of power relay of vehicle-mounted charger, vehicle-mounted charger and automobile |
| CN109239588A (en) * | 2017-07-11 | 2019-01-18 | 宁德时代新能源科技股份有限公司 | Fault detection circuit and method |
| WO2019019082A1 (en) * | 2017-07-27 | 2019-01-31 | 深圳驿普乐氏科技有限公司 | Method and system for detecting switch adhesion of output end of power module |
| CN109353295A (en) * | 2018-10-23 | 2019-02-19 | 武汉格罗夫氢能汽车有限公司 | A kind of integrated PDU system of new-energy automobile |
| CN109633378A (en) * | 2018-12-28 | 2019-04-16 | 深圳市英威腾电动汽车驱动技术有限公司 | High voltage power distribution circuit and switch adhesion detection method |
| CN109669120A (en) * | 2019-01-17 | 2019-04-23 | 力神动力电池系统有限公司 | A kind of battery system relay adhesion detection circuit |
| CN110261766A (en) * | 2019-06-13 | 2019-09-20 | 奇瑞汽车股份有限公司 | Relay is adhered observation circuit and monitoring method |
| CN110470981A (en) * | 2019-07-26 | 2019-11-19 | 东软睿驰汽车技术（沈阳）有限公司 | A kind of circuit of determining contactor state, method and device |
| CN110598876A (en) * | 2019-08-19 | 2019-12-20 | 特瓦特能源科技有限公司 | Fault monitoring method and device, storage medium and electronic equipment |
| CN110888050A (en) * | 2019-11-12 | 2020-03-17 | 东风汽车有限公司 | Relay adhesion detection device and vehicle |
| CN111707934A (en) * | 2020-05-14 | 2020-09-25 | 华为技术有限公司 | Switch detector, use method of switch detector and vehicle |
| CN112213631A (en) * | 2020-09-03 | 2021-01-12 | 珠海格力电器股份有限公司 | Relay state detection device and method and automobile |
| CN112526337A (en) * | 2020-12-08 | 2021-03-19 | 深圳威迈斯新能源股份有限公司 | Electric vehicle relay adhesion detection circuit and detection method thereof |
| CN113311323A (en) * | 2021-06-18 | 2021-08-27 | 湖北亿纬动力有限公司 | New energy automobile relay on-line detection system and method |
| CN113311324A (en) * | 2021-06-18 | 2021-08-27 | 湖北亿纬动力有限公司 | New energy automobile relay on-line detection method, battery management system and battery pack |
| CN113311325A (en) * | 2021-06-18 | 2021-08-27 | 湖北亿纬动力有限公司 | New energy automobile relay on-line detection method and cloud analysis platform |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107300670A (en) * | 2017-06-08 | 2017-10-27 | 北京新能源汽车股份有限公司 | Detection circuit of power relay of vehicle-mounted charger, vehicle-mounted charger and automobile |
| CN109239588A (en) * | 2017-07-11 | 2019-01-18 | 宁德时代新能源科技股份有限公司 | Fault detection circuit and method |
| WO2019019082A1 (en) * | 2017-07-27 | 2019-01-31 | 深圳驿普乐氏科技有限公司 | Method and system for detecting switch adhesion of output end of power module |
| CN109353295A (en) * | 2018-10-23 | 2019-02-19 | 武汉格罗夫氢能汽车有限公司 | A kind of integrated PDU system of new-energy automobile |
| CN109633378A (en) * | 2018-12-28 | 2019-04-16 | 深圳市英威腾电动汽车驱动技术有限公司 | High voltage power distribution circuit and switch adhesion detection method |
| CN109669120A (en) * | 2019-01-17 | 2019-04-23 | 力神动力电池系统有限公司 | A kind of battery system relay adhesion detection circuit |
| CN110261766A (en) * | 2019-06-13 | 2019-09-20 | 奇瑞汽车股份有限公司 | Relay is adhered observation circuit and monitoring method |
| CN110470981A (en) * | 2019-07-26 | 2019-11-19 | 东软睿驰汽车技术（沈阳）有限公司 | A kind of circuit of determining contactor state, method and device |
| CN110598876A (en) * | 2019-08-19 | 2019-12-20 | 特瓦特能源科技有限公司 | Fault monitoring method and device, storage medium and electronic equipment |
| CN110888050A (en) * | 2019-11-12 | 2020-03-17 | 东风汽车有限公司 | Relay adhesion detection device and vehicle |
| CN111707934A (en) * | 2020-05-14 | 2020-09-25 | 华为技术有限公司 | Switch detector, use method of switch detector and vehicle |
| WO2021227582A1 (en) * | 2020-05-14 | 2021-11-18 | 华为数字能源技术有限公司 | Switch detector, method of use of switch detector, and vehicle |
| CN112213631A (en) * | 2020-09-03 | 2021-01-12 | 珠海格力电器股份有限公司 | Relay state detection device and method and automobile |
| CN112213631B (en) * | 2020-09-03 | 2021-11-09 | 珠海格力电器股份有限公司 | Relay state detection device and method and automobile |
| CN112526337A (en) * | 2020-12-08 | 2021-03-19 | 深圳威迈斯新能源股份有限公司 | Electric vehicle relay adhesion detection circuit and detection method thereof |
| CN112526337B (en) * | 2020-12-08 | 2023-12-22 | 深圳威迈斯新能源股份有限公司 | Electric automobile relay adhesion detection circuit and detection method thereof |
| CN113311323A (en) * | 2021-06-18 | 2021-08-27 | 湖北亿纬动力有限公司 | New energy automobile relay on-line detection system and method |
| CN113311324A (en) * | 2021-06-18 | 2021-08-27 | 湖北亿纬动力有限公司 | New energy automobile relay on-line detection method, battery management system and battery pack |
| CN113311325A (en) * | 2021-06-18 | 2021-08-27 | 湖北亿纬动力有限公司 | New energy automobile relay on-line detection method and cloud analysis platform |
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Application publication date: 20170524 |