CN106872173A - Motor temperature sampling loop fault detection method and detection circuit - Google Patents
Motor temperature sampling loop fault detection method and detection circuit Download PDFInfo
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- CN106872173A CN106872173A CN201710293007.0A CN201710293007A CN106872173A CN 106872173 A CN106872173 A CN 106872173A CN 201710293007 A CN201710293007 A CN 201710293007A CN 106872173 A CN106872173 A CN 106872173A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/007—Testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K2205/00—Application of thermometers in motors, e.g. of a vehicle
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Abstract
The invention provides a motor temperature sampling loop fault detection method and a detection circuit, wherein the detection method comprises the following steps: acquiring a sampling signal of a sampling point in a motor temperature sampling loop arranged in a motor, wherein the sampling point is a sampling point corresponding to a temperature detector in the motor temperature sampling loop; and carrying out fault detection on the motor temperature sampling loop according to the sampling signal to obtain a fault detection result. According to the fault detection method for the motor temperature sampling loop, the motor temperature sampling loop is reasonably designed, and sampling signals fed back by the multiple temperature detectors in the motor stator are fully utilized to judge faults of the sampling loop on the basis, so that the fault detection method has the characteristics of simplicity, convenience, easiness in implementation and easiness in implementation, does not additionally increase the manufacturing cost, and has good popularization value.
Description
Technical field
The present invention relates to electric vehicle engineering field, more particularly to a kind of motor temperature sampling circuit fault detection method and
Detection circuit.
Background technology
In face of increasingly severe energy and environment problem, energy-conservation is just turning into the heat of current various countries research with new-energy automobile
Point, the government of Main Countries has all put into a large amount of manpower and materials and has carried out related R＆D work, greatly develop energy-conservation with it is new
Energy automobile is for realizing Global Sustainable Development, protecting earth environment for the survival of mankind significant.In China,
Energy-conservation has obtained the great attention of government and industrial quarters with new-energy automobile, and is set to one of emerging strategic industries.Hair
Exhibition energy-conservation and new-energy automobile, the especially pure electric automobile with no pollution, zero-emission, not only to Chinese energy safety, ring
Border protection is significant, while being also the trend of China's automotive field Future Development.
Pure electric automobile realizes that vehicle is travelled by power wheel, and motor drives and controls to influence weight to vehicle performance
Greatly, the emphasis of major pure electric automobile manufacturers research both at home and abroad is turned into for this.With permanent-magnet material, Power Electronic Technique, control
The development of theoretical, motor manufacturing and signal transacting hardware, permagnetic synchronous motor (PMSM) has obtained commonly used, permanent-magnet synchronous
Motor due to having the advantages that high efficiency, height output torque, high power density and good dynamic property, at present as pure
The main flow of drive system of electric automobile.In the process of running, drive system can produce substantial amounts of heat to pure electric automobile, to ensure
The normal work of drive system, it is necessary to by certain cooling way by the temperature control of motor certain temperature value with
Under.If motor work can produce serious harm to its body under over-temperature conditions, such as permanent magnet permanently demagnetizes, mistake of insulating
Effect, bearing lubrication failure etc., will cause to have a strong impact on when motor occurs problem above to traffic safety.By motor temperature
Control is accurate and effective acquisition motor Current Temperatures in an important prerequisite of normal range (NR), and before obtaining motor temperature
It is motor temperature sampling circuit normal work to carry.
The content of the invention
The embodiment of the present invention provides a kind of motor temperature sampling circuit fault detection method and detection circuit, existing to solve
The Current Temperatures of motor cannot be effectively obtained in technology and motor temperature the problem in a zone of reasonableness cannot be controlled.
The embodiment of the present invention provides a kind of motor temperature sampling circuit fault detection method, and methods described includes：
Acquisition is arranged at the sampled signal of the sampled point in the motor temperature sampling circuit in motor, wherein, the sampling
Point is the corresponding sampled point of temperature detector in the motor temperature sampling circuit；
According to the sampled signal, fault detect is carried out to the motor temperature sampling circuit, obtain failure detection result.
Wherein, methods described also includes：
According to the failure detection result, the fault level of motor is determined；
According to the fault level and the corresponding troubleshooting mode of default fault level, failure is processed.
Wherein, the temperature detector is the thermistor in the motor, and acquisition is arranged at the motor temperature in motor
The step of sampled signal of the sampled point in sampling circuit, includes：
Obtain the thermistor corresponding voltage sample value and/or acquisition in the motor temperature sampling circuit described
The corresponding temperature sampling value of thermistor.
Wherein, the thermistor is obtained to be wrapped the step of corresponding voltage sample value in the motor temperature sampling circuit
Include：
The thermistor is obtained in the motor temperature sampling circuit relative to the first voltage value of supply voltage, really
The fixed first voltage value is the corresponding voltage sample value of the thermistor；Wherein, one end ground connection of the thermistor, separately
One end is connected in series with first resistor (R1), and the first resistor (R1) is connected with power supply.
Wherein, by the voltage detector being arranged in the motor temperature sampling circuit, the first voltage value is obtained；
The voltage detector is connected with a low-pass filter circuit, and the low-pass filter circuit is connected to the first resistor (R1) and institute
State between thermistor.
Wherein, the low-pass filter circuit includes：It is connected between the first resistor (R1) and the thermistor
Second resistance, the first electric capacity (C1) being connected with one end of the second resistance and is connected with the second resistance other end
Second electric capacity (C2), first electric capacity (C1) and second electric capacity (C2) are grounded.
Wherein, the step of obtaining the thermistor corresponding temperature sampling value includes：
Obtain the thermistor corresponding resistance value in the motor temperature sampling circuit；
According to the corresponding resistance value of the thermistor, and the resistance value of the thermistor corresponding with temperature value is closed
System, obtains the corresponding temperature sampling value of the thermistor.
Wherein, obtain the thermistor includes in the motor temperature sampling circuit the step of corresponding resistance value：
By V (supply voltage)/(R1+R0)=V1/R0, the resistance value (R0) of the thermistor is determined；Wherein, it is described
One end ground connection of thermistor, the other end is connected with first resistor (R1), and the first resistor (R1) is connected with power supply, and V1 is institute
State the corresponding first voltage value of thermistor.
Wherein, according to the sampled signal, fault detect is carried out to the motor temperature sampling circuit, obtains fault detect
As a result the step of, includes：
If any one the corresponding voltage sample value in the multiple thermistors set on the motor is more than the first electricity
Pressure threshold value, it is determined that power supply short circuit or open circuit fault occurs in the corresponding motor temperature sampling circuit of the thermistor.
Wherein, according to the sampled signal, fault detect is carried out to the motor temperature sampling circuit, obtains fault detect
As a result the step of, includes：
If any two in the multiple thermistors set on the motor is distinguished in the difference of corresponding temperature sampling value
Maximum, more than preset temperature threshold value, it is determined that the motor occurrence temperature verifies abnormal failure.
Wherein, according to the sampled signal, fault detect is carried out to the motor temperature sampling circuit, obtains fault detect
As a result the step of, includes：
Judge whether any one the corresponding voltage sample value in the multiple thermistors set on the motor is more than
First voltage threshold value；If, it is determined that there is power supply short circuit or disconnected in the corresponding motor temperature sampling circuit of the thermistor
Whether road failure, otherwise, judge any one the corresponding voltage sample value in multiple thermistors less than second voltage threshold value；
When the corresponding voltage sample value of any one thermistor is less than second voltage threshold value, the thermistor pair is determined
There is shorted to earth failure in the motor temperature sampling circuit answered；
When the voltage sample value of multiple thermistors be respectively positioned on the first voltage threshold value and the second voltage threshold value it
Between when, judge that whether any two in multiple thermistors distinguishes the maximum in the difference of corresponding temperature sampling value more than pre-
If temperature threshold, if, it is determined that the motor occurrence temperature verifies abnormal failure.
Wherein, the multiple thermistor is uniformly arranged on the circumference of the stator of the motor.
Wherein, include according to the failure detection result, the step of the fault level for determining motor：
When the corresponding motor temperature sampling circuit of multiple thermistors occur power supply short circuit failure, open circuit fault or
During any one in person's shorted to earth failure, the fault level for determining the motor is the first estate；
When the number for the motor temperature sampling circuit of power supply short circuit failure, open circuit fault or shorted to earth failure occur
Amount determines the fault level of the motor for the second grade more than zero and during less than N, and wherein N is the quantity of multiple thermistors,
One thermistor corresponds to a motor temperature sampling circuit；
When it is determined that during motor occurrence temperature verification abnormal failure, determining the fault level of the motor for the third
Level.
Wherein, according to the fault level and the corresponding troubleshooting mode of default fault level, failure is carried out
The step for the treatment of, includes：
When the fault level of the motor is the first estate, using the corresponding first preset failure prompting side of the first estate
Formula, is reminded；
When the fault level of the motor is the second grade, using the corresponding second preset failure prompting side of the second grade
Formula, is reminded；
When the fault level of the motor is the tertiary gradient, using the corresponding 3rd preset failure prompting side of the tertiary gradient
Formula, is reminded.
The embodiment of the present invention also provides a kind of motor temperature sampling circuit failure detector circuit, including：
Controller, at least one motor temperature sampling circuit being connected with controller；
The motor temperature sampling circuit includes：The first resistor being connected with power supply, the temperature connected with the first resistor
Degree detector；
The controller, the sampling letter for obtaining the sampled point in the motor temperature sampling circuit being arranged in motor
Number, wherein, during the sampled point is the motor temperature sampling circuit, the corresponding sampled point of the temperature detector；And according to
The sampled signal, fault detect is carried out to the motor temperature sampling circuit, obtains failure detection result.
Wherein, the controller is additionally operable to determine according to the failure detection result fault level of motor；According to described
Fault level and the corresponding troubleshooting mode of default fault level, are processed failure.
Wherein, the temperature detector is thermistor；The motor temperature sampling circuit includes：Low-pass filter circuit with
And voltage detector, the low-pass filter circuit is connected between the first resistor (R1) and the thermistor, the electricity
Pressure detector is connected with the low-pass filter circuit.
Wherein, the low-pass filter circuit includes：Is connected between the first resistor (R1) and the thermistor
Two resistance, the first electric capacity (C1) being connected with one end of the second resistance and be connected with the second resistance other end
Two electric capacity (C2), first electric capacity (C1) and second electric capacity (C2) are grounded.
The embodiment of the present invention at least includes following beneficial effect：
Technical solution of the present invention, by rationally design motor temperature acquisition circuit, obtains temperature detector in motor temperature
The sampled signal of corresponding sample point in sampling circuit, and using the sampling of motor stator inside multi-channel temperature measurement device feedback
Signal carries out the judgement of sampling circuit failure, obtains failure detection result, with it is simple and easy to do, be easily achieved the characteristics of, while
Manufacturing cost will not additionally be increased, with good promotional value.Further, after failure detection result is obtained, according to
To the extent of injury of traffic safety under loop fault state, corresponding processing method is determined, on the premise of traffic safety is ensured
Adequately protect the driving experience of driver.
Brief description of the drawings
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is a part of embodiment of the invention, rather than whole embodiments.Based on this hair
Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to the scope of protection of the invention.
Fig. 1 represents motor temperature sampling circuit fault detection method schematic diagram；
Fig. 2 represents motor framework schematic diagram；
Fig. 3 represents motor temperature sampling circuit schematic diagram；
Fig. 4 represents the temperature sampling value fault detect schematic diagram of motor temperature sampling circuit；
Fig. 5 represents the voltage sample value of motor temperature sampling circuit, temperature sampling value fault detect schematic diagram；
Fig. 6 represents motor temperature sampling circuit failure detector circuit schematic diagram.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is a part of embodiment of the invention, rather than whole embodiments.Based on this hair
Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to the scope of protection of the invention.
The embodiment of the present invention provides a kind of motor temperature sampling circuit fault detection method, as shown in figure 1, including：
Step 101, acquisition are arranged at the sampled signal of the sampled point in the motor temperature sampling circuit in motor, wherein,
Sampled point is the corresponding sampled point of temperature detector in motor temperature sampling circuit.
As shown in Fig. 2 the diverse location on motor is respectively arranged with temperature detector 2, motor here is that permanent magnetism is same
Step motor, wherein motor includes：Stator 11, rotor 12 and permanent magnet 13.Multiple temperature detectors 2 may be contained within determining for motor
On the circumference of son 11, that is, it is arranged in stator winding coil, before stator coil winding, multiple temperature detectors 2 is set
In on stator 11, then carrying out coil winding, and position of each temperature detector 2 on motor is different.
Each temperature detector corresponds to a motor temperature sampling circuit, and sampled signal can include the electricity of temperature detector
Pressure sampled value and/or temperature sampling value, temperature detector provided in an embodiment of the present invention is thermistor, and electricity is arranged in acquisition
During the sampled signal of the sampled point in motor temperature sampling circuit in machine, specially：Thermistor is obtained to be adopted in motor temperature
Corresponding voltage sample value and/or the corresponding temperature sampling value of acquisition thermistor in sample loop.
As shown in figure 3, motor temperature sampling circuit includes：Power supply 22, the first resistor 23, Yi Jiyu being connected with power supply 22
The thermistor 21 of the series connection of first resistor 23, one end ground connection of thermistor 21, the other end is connected to electricity by first resistor 23
Source 22.
When thermistor corresponding voltage sample value in motor temperature sampling circuit is obtained：Thermistor is obtained in electricity
Relative to the first voltage value of supply voltage in machine temperature sampling loop, determine that first voltage value is the corresponding voltage of thermistor
Sampled value；Wherein, one end ground connection of thermistor, the other end is connected in series with first resistor (R1), first resistor (R1) with it is electric
Source connects.
Wherein, the process of acquisition first voltage value is：By the voltage detector being arranged in motor temperature sampling circuit,
Obtain first voltage value；Voltage detector is connected with a low-pass filter circuit, and low-pass filter circuit is connected to first resistor (R1)
Between thermistor.
Specifically, as shown in figure 3, motor temperature sampling circuit also includes：Low-pass filter circuit 24, wherein LPF electricity
Road 24 is arranged between first resistor 23 and thermistor 21, first resistor 23, thermistor 21 and low-pass filter circuit 24 1
The intersection at end forms the first test point.
The second test point is formed in the other end of low-pass filter circuit 24, voltage detector 25 is arranged at the second test point
Place, wherein at steady state, corresponding magnitude of voltage is equal at corresponding magnitude of voltage, the second test point at the first test point, and
It is the corresponding voltage sample value of thermistor 21.Using voltage detecting is carried out at 25 pairs of the second test points of voltage detector, i.e.,
The corresponding first voltage value of thermistor 21 can be obtained.Wherein, with the setting voltage at the second test point in the embodiment of the present invention
Detector is illustrated, by after the treatment of low-pass filter circuit so that low frequency signal can be detected normal through reaching second
Point, and the high-frequency signal for exceeding setting critical value is then blocked, weakens.Ignore the influence of interference, at steady state, the first inspection
Measuring point is equal with corresponding magnitude of voltage at the second test point.
It should be noted that at steady state, it is equal with corresponding magnitude of voltage at the second test point at the first test point,
Voltage detector can also be set at the first test point to detect the corresponding voltage sample value of thermistor.
Low-pass filter circuit 24 includes：The second resistance 241 between first resistor (R1) 23 and thermistor 21 is connected to,
The first electric capacity (C1) 242 being connected with one end of second resistance 241 and the second electric capacity being connected with the other end of second resistance 241
(C2) 243, the first electric capacity (C1) 242 and the second electric capacity (C2) 243 are grounded.
Wherein, low-pass filter circuit 24 is by second resistance 241, the first electric capacity (C1) 242 and the structure of the second electric capacity (C2) 243
First end into, second resistance 241 is in the intersection of first resistor (R1) 23 and thermistor 21, and the of second resistance 241
Two ends form the second test point, and the first electric capacity (C1) 242 is in parallel with the second electric capacity (C2) 243, and the of the first electric capacity (C1) 242
One end is connected with the first end of second resistance 241, the second end of the first electric capacity (C1) 242 ground connection, and the of the second electric capacity (C2) 243
One end is connected with the second end of second resistance 241, the second end ground connection of the second electric capacity (C2) 243.Wherein second resistance 241 with
After the intersection of the second electric capacity 243 extends to the direction away from second resistance 241, second can be formed on extension circuit line and detected
Point.
The low-pass filter circuit being made up of second resistance, the first electric capacity (C1) and the second electric capacity (C2) so that low frequency is believed
Number can be normal through, and the high-frequency signal for exceeding setting critical value is then blocked, weakens.Voltage after RC LPFs by carrying out
Collection, the test point of influence first for ignoring interference is equal with the voltage at the second test point.
Wherein, in the first test point and during power supply short circuit, the magnitude of voltage that now detection is obtained at the second test point close to
Supply voltage, it is determined that there occurs motor temperature sampling circuit to power supply short circuit failure.In the first test point and ground wire short circuit, this
When the second test point at the magnitude of voltage that obtains of detection near 0V, it is determined that there occurs motor temperature sampling circuit to earth short therefore
Barrier.When there is open circuit fault at the second test point, the magnitude of voltage that now detection is obtained at the second test point is electric close to power supply
, now there is motor temperature sampling circuit open circuit fault in pressure.
In the corresponding temperature sampling value of acquisition thermistor：Obtain thermistor correspondence in motor temperature sampling circuit
Resistance value；According to the corresponding resistance value of thermistor, and thermistor resistance value and the corresponding relation of temperature value, obtain
The corresponding temperature sampling value of thermistor.
Specifically, obtaining thermistor in motor temperature sampling circuit during corresponding resistance value：By V (power supply electricity
Pressure)/(R1+R0)=V1/R0, determine the resistance value (R0) of thermistor；Wherein, thermistor one end ground connection, the other end with
First resistor (R1) is connected, and first resistor (R1) is connected with power supply, and V1 is the corresponding first voltage value of thermistor.
Thermistor is connected with first resistor, and thermistor, first resistor, power supply are arranged in order to form a string of UNICOMs
Road, calculates resistance value (R0) and first resistor (R1) sum of thermistor, as V (supply voltage) with obtained by and the ratio between value is true
Determine the current value in series via, calculate the ratio between resistance value (R0) of first voltage value (V1) and thermistor and obtain series via
On current value, draw following relational expressions：V/ (R1+R0)=V1/R0；Due to first resistor (R1), first voltage value (V1) with
And supply voltage (V) is given value, then the resistance value R0 of thermistor can be obtained.
After the corresponding resistance value of thermistor is obtained, the resistance value pass corresponding with temperature value according to thermistor
System, searches temperature value corresponding with the resistance of thermistor, acquires the corresponding temperature sampling value of thermistor.
Step 102, according to sampled signal, fault detect is carried out to motor temperature sampling circuit, obtain failure detection result.
Wherein here sampled signal includes：The voltage sample value and/or temperature sampling value of temperature detector, when sampling is believed
Number include：During the voltage sample value of temperature detector, according to sampled signal, fault detect is carried out to motor temperature sampling circuit,
The process for obtaining failure detection result is：If any one the corresponding voltage sample in the multiple thermistors set on motor
Value is more than first voltage threshold value, it is determined that power supply short circuit or open circuit event occurs in the corresponding motor temperature sampling circuit of the thermistor
Barrier.Plurality of thermistor is uniformly arranged on the circumference of the stator of motor.
Specifically, for multiple thermistors, after the corresponding voltage sample value of multiple thermistors is obtained, will
Multiple voltage sample values of acquisition are compared with first voltage threshold value respectively, when the corresponding voltage of one thermistor of presence is adopted
Sample value be more than first voltage threshold value when, it is determined that now the corresponding motor temperature sampling circuit of the thermistor occur power supply short circuit or
Open circuit fault.For example：The quantity of thermistor is 3, respectively thermistor A, thermistor B, thermistor C, positioned at electricity
120 degree of angle is separated between the diverse location of machine, and adjacent thermistor, is adopted the corresponding voltages of thermistor A are obtained
After the corresponding voltage sample value VB1 of sample value VA1, thermistor B, the corresponding voltage sample value VC1 of thermistor C, judge
It is more than first voltage threshold value VH with the presence or absence of a voltage sample value in VA1, VB1, VC1, if VA1 is more than the in VA1, VB1, VC1
One voltage threshold VH, then can determine that the corresponding motor temperature sampling circuits of thermistor A occur power supply short circuit or open circuit fault,
Wherein first voltage threshold value VH is less than supply voltage.
The present invention applicable permagnetic synchronous motor system, in the pre-buried multi way temperature sensor of stator winding inner homogeneous,
Correspondence is obtained in that multi way temperature information, and in the motor course of work, stator winding internal temperature field distributes very evenly, normally
The temperature information of temperature sensor feedback should be basically identical under state, relatively large deviation should not occurs, based on permagnetic synchronous motor
This characteristic provide multi way temperature signal checking method.When sampled signal includes：During the temperature sampling value of temperature detector, root
According to sampled signal, fault detect is carried out to motor temperature sampling circuit, the process for obtaining failure detection result is：If being set on motor
Any two in the multiple thermistors put distinguishes the maximum in the difference of corresponding temperature sampling value, more than preset temperature threshold
Value, it is determined that motor occurrence temperature verifies abnormal failure.
Specifically, for multiple thermistors, after the corresponding temperature sampling value of multiple thermistors is obtained, meter
The difference of the corresponding temperature sampling value of any two thermistor is calculated, after the temperature sampling difference for obtaining predetermined number,
The temperature sampling difference of maximum is determined in the temperature sampling difference of predetermined number, then by maximum temperature sampling difference with it is default
Temperature threshold is compared, and when maximum temperature sampling difference is more than preset temperature threshold value, determines that motor there occurs temperature school
Test abnormal failure.For example：The quantity of thermistor is 3, and respectively thermistor A, thermistor B, thermistor C are located at
120 degree of angle is separated between the diverse location of motor, and adjacent thermistor, the corresponding temperature of thermistor A is being obtained
After the corresponding temperature sampling value TB1 of sampled value TA1, thermistor B, the corresponding temperature sampling value TC1 of thermistor C, perform
Process as shown in Figure 4：
Step 401, calculating | TA1-TB1 |, | TA1-TC1 |, | TB1-TC1 |, determine in three temperature absolute value differences
Maximum difference DELTA T.
Step 402, judge Δ T whether more than preset temperature threshold k T.
Step 403, when Δ T be more than KT when, determine that motor there occurs temperature checking abnormal failure, otherwise terminate flow.
When sampled signal includes：When the voltage sample value and temperature sampling value of temperature detector, according to sampled signal, to electricity
Machine temperature sampling loop carries out fault detect, and the process for obtaining failure detection result is：Judge the multiple temperature-sensitives set on motor
Whether any one the corresponding voltage sample value in resistance is more than first voltage threshold value；If, it is determined that the thermistor pair
There is power supply short circuit or open circuit fault in the motor temperature sampling circuit answered, otherwise, judges any one in multiple thermistors
Whether corresponding voltage sample value is less than second voltage threshold value；When the corresponding voltage sample value of any one thermistor is less than the
During two voltage thresholds, determine that shorted to earth failure occurs in the corresponding motor temperature sampling circuit of the thermistor；When multiple temperature-sensitives
The voltage sample value of resistance is respectively positioned on when between first voltage threshold value and second voltage threshold value, appointing in the multiple thermistors of judgement
Whether the maximum in the difference of the corresponding temperature sampling value of two difference of meaning is more than preset temperature threshold value, if, it is determined that motor
Occurrence temperature verifies abnormal failure.
Specifically, being judged according to the corresponding multiple voltage sample values of multiple thermistors first, multiple heat are being obtained
After the corresponding voltage sample value of quick resistance, the multiple voltage sample values for obtaining are compared with first voltage threshold value respectively,
When the corresponding voltage sample value of one thermistor of presence is more than first voltage threshold value, it is determined that now the thermistor is corresponding
There is power supply short circuit or open circuit fault in motor temperature sampling circuit, terminates flow.
When the corresponding voltage sample value of each thermistor is respectively less than first voltage threshold value, a temperature-sensitive is judged whether
The corresponding voltage sample value of resistance is less than second voltage threshold value；If the corresponding voltage sample value of a wherein thermistor is less than second
Voltage threshold, it is determined that now shorted to earth failure occurs in the corresponding motor temperature sampling circuit of the thermistor.Wherein second
Voltage threshold is less than first voltage threshold value.
When the corresponding voltage sample value of each thermistor is respectively less than first voltage threshold value and more than second voltage threshold value
When, i.e., the corresponding voltage sample value of each thermistor is respectively positioned on the region model that first voltage threshold value and second voltage threshold value are formed
In enclosing, then need to continue to be judged according to the corresponding temperature sampling value of multiple thermistors.For multiple thermistors,
After the corresponding temperature sampling value of multiple thermistors is obtained, the corresponding temperature sampling value of any two thermistor is calculated
Difference, after the temperature sampling difference for obtaining predetermined number, determines the temperature of maximum in the temperature sampling difference of predetermined number
, then with preset temperature threshold value be compared maximum temperature sampling difference by degree sampling difference, when maximum temperature sampling is poor
When value is more than preset temperature threshold value, determine that motor there occurs temperature checking abnormal failure.
For example, the quantity of thermistor is 3, respectively thermistor A, thermistor B, thermistor C, positioned at motor
Diverse location, and between adjacent thermistor between be separated with 120 degree of angle, obtaining the corresponding voltage samples of thermistor A
After the corresponding voltage sample value VB1 of value VA1, thermistor B, the corresponding voltage sample value VC1 of thermistor C, such as Fig. 5 is performed
Shown process：
Step 501, judge to be more than first voltage threshold value VH with the presence or absence of an at least voltage sample value in VA1, VB1, VC1.
If being more than first voltage threshold value VH in the presence of an at least voltage sample value, step 502 is performed, otherwise perform step 503.
There is power supply short circuit or open circuit fault in step 502, a determination at least motor temperature sampling circuit.
Step 503, judge to be less than second voltage threshold value VL with the presence or absence of an at least voltage sample value in VA1, VB1, VC1.
If then performing step 504, step 505 is otherwise performed.
There is shorted to earth failure in step 504, a determination at least motor temperature sampling circuit.
Step 505, the corresponding temperature sampling value TA1 of acquisition thermistor A, the corresponding temperature sampling values of thermistor B
The corresponding temperature sampling value TC1 of TB1, thermistor C, calculates | TA1-TB1 |, | TA1-TC1 |, | TB1-TC1 |, in three temperature
The difference DELTA T of maximum is determined in absolute value differences.
Step 506, judge Δ T whether more than preset temperature threshold k T.
Step 507, when Δ T be more than KT when, determine that motor there occurs temperature checking abnormal failure, otherwise terminate flow.
Various malfunctions can be determined by above-mentioned flow, step 103 is then performed.
Step 103, according to failure detection result, determine the fault level of motor.
After fault detect is carried out according to sampled signal, fault level, sampling letter are determined according to failure detection result
Number include the voltage sample value and/or temperature sampling value of temperature detector, when the sampling of multiple thermistors corresponding motor temperature
When any one in power supply short circuit failure, open circuit fault or shorted to earth failure occurs in loop, failure of motor etc. is determined
Level is the first estate；When the motor temperature sampling circuit for power supply short circuit failure, open circuit fault or shorted to earth failure occur
Quantity determines the fault level of motor for the second grade more than zero and during less than N, and wherein N is the quantity of multiple thermistors, one
Thermistor corresponds to a motor temperature sampling circuit；When it is determined that motor occurrence temperature verifies abnormal failure, motor is determined
Fault level is the tertiary gradient.
Specifically, when being judged for voltage signal, when the quantity of thermistor be it is N number of, and N number of thermistor electricity
Pressure value is not located at when between first voltage threshold value VH and second voltage threshold value VL, determines the corresponding N number of motor of N number of thermistor
There is any one failure in power supply short circuit failure, open circuit fault or shorted to earth failure in temperature sampling loop, now electricity
The corresponding fault level of machine is the first estate.It should be noted that the failure that N number of motor temperature sampling circuit occurs can be with identical
Can also be different, but the failure for being included is three kinds, power supply short circuit failure can all occur or all occur open circuit fault or
All there is shorted to earth failure.There is also following situation：There is power supply short circuit failure, part and open circuit fault occur in part, another
There is shorted to earth failure in part；Or there is power supply short circuit failure, part and open circuit fault occur in part；Or part occur it is right
There is open circuit fault in ground short circuit failure, part；Or part occurs power supply short circuit failure, there is shorted to earth failure in part.
When the quantity of the motor temperature sampling circuit for power supply short circuit failure, open circuit fault or shorted to earth failure occur is big
During in zero and less than N, the temperature information of motor stator can also be now obtained at least through motor temperature sampling circuit all the way, really
The fault level for determining motor is the second grade.
When the quantity of the motor temperature sampling circuit for power supply short circuit failure, open circuit fault or shorted to earth failure occur is
Zero, but during motor occurrence temperature verification abnormal failure, the fault level for determining motor is the tertiary gradient.
Step 104, according to fault level and the corresponding troubleshooting mode of default fault level, at failure
Reason.
It is determined that after fault level, it is necessary to be directed to each fault level carry out it is corresponding treatment strategy, when motor therefore
When barrier grade is the first estate, using the corresponding first preset failure alerting pattern of the first estate, reminded.Now due to complete
Portion's motor temperature sampling circuit breaks down, therefore cannot obtain current motor temperature information, to ensure motor
Traffic safety will not be endangered because of overheat, it is necessary first to which driver is reminded, while by actively limiting drive system
Export to prevent motor overheating.Corresponding first preset failure alerting pattern is：Light motor for instrument system-specific trouble light and
Full Vehicle System trouble light, ring alarm sound in the first preset duration；After time delay Ts, adjustment motor maximum torque available to peace
Full limit value (1/3 peak value external characteristics), forbids vehicle anti-skid car function.
First by light instrument fault lamp and in the first preset duration ring alarm sound form driver is carried out
Prompting, makes it recognize that drive system breaks down first, while producing psychological preparation to the subsequent treatment of the failure；In this base
The output of time delay Ts limiting motors torque capacity, prevents motor excess temperature in this way on plinth.Wherein delay time Ts's
Purpose is to leave driver's certain psychological preparation time for, is prevented because output torque limiting function is unexpected to driving experience generation
Influence.
When the fault level of motor is the second grade, using the corresponding second preset failure alerting pattern of the second grade,
Reminded.The temperature information of motor stator can also be now obtained at least through motor temperature sampling circuit all the way, it is corresponding
Second preset failure alerting pattern is：Motor for instrument system-specific trouble light is lighted, ring alarm sound in the second preset duration；By
In motor temperature sampling circuit failure under this state the (motor of electric machine controller will not be impacted to the normal control of motor
Overheat protector mechanism still is able to effectively realization), therefore only just can by way of lighting instrument fault lamp and the short ring of alarm sound
Play the purpose for reminding driver.Wherein the first preset duration is more than the second preset duration.
When the fault level of motor is the tertiary gradient, using the corresponding 3rd preset failure alerting pattern of the tertiary gradient,
Reminded.If being not detected by motor temperature sampling circuit to break down, judge whether motor temperature sampling circuit school
Exception is tested, is reminded using the 3rd preset failure alerting pattern if in the presence of exception：Light motor for instrument system-specific failure
Lamp.(now motor temperature still is able to obtain, Ke Yibao to anomaly may not cause driving hidden danger in view of simple motor temperature verification
The motor overheat protector mechanism for demonstrate,proving electric machine controller still is able to effectively realization), now only by lighting instrument dependent failure lamp
Processing mode just can play a part of to remind driver, can so avoid influenceing to drive due to excess processes (ring alarm sound)
The driving experience of the person of sailing.
Processing method proposed by the present invention, takes full advantage of the hardware redundancy characteristic of motor temperature sampling circuit, reasonably
One group of fault handling method is designed, it is hidden according to the motor temperature sampling circuit failure safety to be caused in processing method
Suffer from, according to the difference of the extent of injury, be from the superficial to the deep classified it is other processed, respectively by lighting instrument fault lamp, ring alarm
The mode of sound is pointed out driver, and for the situation that sampling circuit all breaks down, is exported by limiting motor
The occurrence of mode of torque prevents motor excess temperature.Above processing method is realized to driving on the basis of traffic safety is ensured
Effective protection of the person's of sailing driving experience.
Motor temperature sampling circuit fault detection method provided in an embodiment of the present invention, first by rationally design motor temperature
Degree sample circuit, and make full use of the signal of motor stator inside multichannel thermistor feedback to carry out sampling circuit on this basis
The judgement and troubleshooting of failure.For fault detect, there is provided two ways carries out motor temperature sampling circuit breakdown judge,
First way be by combine the motor course of work in stator interior temperature field the characteristics of, to feed back multichannel motor temperature
Degree signal is verified, and the validity of temperature signal is judged according to check results, and temperature sampling loop is found in time
Abnormality；The second way is to judge sampling circuit failure by the voltage sample value of motor temperature signal；Two methods phase
With reference to motor temperature sampling circuit failure can be made by effective detection.
On the basis of motor temperature sampling circuit fault detect is completed, the invention provides a kind of fault handling method.
The method takes full advantage of the hardware redundancy characteristic that motor temperature detects sampling circuit, reasonably designs one group of troubleshooting side
Method.Analyze the sampling circuit failure potential safety hazard to be caused in the processing method, and according to the difference of the extent of injury, by
It is shallow enter deep classification is other is processed, respectively by lighting instrument fault lamp, the mode of the alarm sound that rings is pointed out driver,
And for the situation that sampling circuit all breaks down, by way of limiting motor output torque, prevent due to
Failure causes in the case of the motor overheat protector mechanism failure of electric machine controller, the occurrence of motor excess temperature.Process above
Method is preferably protected to driver's driving experience simultaneously on the basis of traffic safety is ensured.
The present invention provide pure electric automobile motor temperature sampling loop fault detection and processing method have it is simple and easy to do,
The characteristics of being easily achieved, while will not additionally increase the manufacturing cost of electric machine controller, therefore with good promotional value.
The embodiment of the present invention also provides a kind of motor temperature sampling circuit failure detector circuit, as shown in fig. 6, including：
Controller 6, at least one motor temperature sampling circuit 7 being connected with controller 6；Motor temperature sampling circuit 7 is wrapped
Include：The first resistor 72 being connected with power supply 71, the temperature detector 73 connected with first resistor 72；Controller 6, sets for obtaining
The sampled signal of the sampled point in the motor temperature sampling circuit 7 being placed in motor, wherein, sampled point is that motor temperature is sampled back
In road 7, the corresponding sampled point of temperature detector 73；And according to sampled signal, failure inspection is carried out to motor temperature sampling circuit 7
Survey, obtain failure detection result.
Specifically, controller 6 is connected with motor temperature sampling circuit 7, wherein the quantity of motor temperature sampling circuit 7 is at least
It it is one, each motor temperature sampling circuit 7 includes：Power supply 71, the first resistor 72 being connected with power supply 71, and with first
The temperature detector 73 of the series connection of resistance 72, one end ground connection of temperature detector 73, the other end is connected to electricity by first resistor 72
Source 71.
Controller obtains the corresponding sampled signal of sample point, according to the sampled signal for obtaining to motor temperature sampling circuit
Fault detect is carried out, failure detection result is obtained.Wherein sampled signal includes：The voltage sample value and/or temperature of temperature detector
Degree sampled value.Controller is additionally operable to according to failure detection result, determines the fault level of motor；According to fault level and default
The corresponding troubleshooting mode of fault level, failure is processed.
Wherein, controller carries out fault detect according to sampled signal to motor temperature sampling circuit, obtains fault detect knot
The process of fruit is：When sampled signal is voltage sample value, any one the corresponding magnitude of voltage in multiple thermistors is judged
Whether first voltage threshold value is more than, if, it is determined that there is power supply short circuit in the corresponding motor temperature sampling circuit of the thermistor
Or open circuit fault.
When sampled signal is temperature sampling value, any two in the multiple thermistors of judgement respectively adopt by corresponding temperature
Maximum in the difference of sample value, if more than preset temperature threshold value, if, it is determined that motor occurrence temperature verifies abnormal failure.
When sampled signal is voltage sample value and temperature sampling value, in judging on motor multiple thermistors of setting
Whether any one corresponding magnitude of voltage is more than first voltage threshold value；If, it is determined that the corresponding motor temperature of the thermistor
There is power supply short circuit or open circuit fault in sampling circuit, otherwise, judges any one the corresponding magnitude of voltage in multiple thermistors
Whether second voltage threshold value is less than；When the corresponding magnitude of voltage of any one thermistor is less than second voltage threshold value, it is determined that should
There is shorted to earth failure in the corresponding motor temperature sampling circuit of thermistor；When the magnitude of voltage of multiple thermistors is respectively positioned on
When between one voltage threshold and second voltage threshold value, judge that any two in multiple thermistors distinguishes corresponding temperature value
Whether the maximum in difference is more than preset temperature threshold value, if, it is determined that motor occurrence temperature verifies abnormal failure.
Controller determines the fault level of motor according to failure detection result, according to fault level and default failure
The corresponding troubleshooting mode of grade, the process processed failure is：
When power supply short circuit failure, open circuit fault or right occurs in the corresponding motor temperature sampling circuit of multiple thermistors
During any one in ground short circuit failure, the fault level for determining motor is the first estate；When occur power supply short circuit failure, open circuit therefore
The quantity of the motor temperature sampling circuit of barrier or shorted to earth failure determines the fault level of motor more than zero and during less than N
It is the second grade, wherein N is the quantity of multiple thermistors, and a thermistor corresponds to a motor temperature sampling circuit；When true
When determining motor occurrence temperature verification abnormal failure, the fault level for determining motor is the tertiary gradient.
When the fault level of motor is the first estate, using the corresponding first preset failure alerting pattern of the first estate,
Reminded；When the fault level of motor is the second grade, using the corresponding second preset failure alerting pattern of the second grade,
Reminded；When the fault level of motor is the tertiary gradient, using the corresponding 3rd preset failure alerting pattern of the tertiary gradient,
Reminded.
In embodiments of the present invention, as shown in fig. 6, temperature detector 73 is thermistor；Motor temperature sampling circuit 7 is also
Including：Low-pass filter circuit 74 and voltage detector 75, low-pass filter circuit 74 are connected to first resistor (R1) 72 and temperature-sensitive
Between resistance, second voltage detector 75 is connected with low-pass filter circuit 74.
Low-pass filter circuit 74 includes：First resistor (R1) second resistance 741 between 72 and thermistor are connected to, with
First electric capacity (C1) 742 of one end connection of two resistance 741 and the second electric capacity (C2) being connected with the other end of second resistance 741
743, the first electric capacity (C1) 742 and the second electric capacity (C2) 743 are grounded.
Specifically, motor temperature sampling circuit 7 also includes：Low-pass filter circuit 74 and voltage detector 75, low pass filtered
Wave circuit 74 is arranged between first resistor 72 and thermistor, first resistor 72, thermistor and low-pass filter circuit 74 1
The intersection at end forms the first test point, and the second test point, voltage detector 75 are formed in the other end of low-pass filter circuit 74
It is arranged at the second test point, using carrying out voltage detecting at 75 pairs of the second test points of voltage detector, you can obtain temperature-sensitive electricity
Hinder corresponding first voltage value.
Low-pass filter circuit 74 is made up of second resistance 741, the first electric capacity (C1) 742 and the second electric capacity (C2) 743, the
The first end of two resistance 741 is in the intersection of first resistor (R1) 72 and thermistor, and the second end of second resistance 741 is formed
Second test point, the first electric capacity (C1) 742 is in parallel with the second electric capacity (C2) 743, the first end of the first electric capacity (C1) 742 and the
The first end connection of two resistance 741, the second end ground connection of the first electric capacity (C1) 742, the first end of the second electric capacity (C2) 743 and the
The second end connection of two resistance 741, the second end ground connection of the second electric capacity (C2) 743.
Above-described is the preferred embodiment of the present invention, it should be pointed out that the ordinary person for the art comes
Say, some improvements and modifications can also be made under the premise of principle of the present invention is not departed from, and these improvements and modifications also exist
In protection scope of the present invention.
Claims (18)
1. a kind of motor temperature sampling circuit fault detection method, it is characterised in that methods described includes：
Acquisition is arranged at the sampled signal of the sampled point in the motor temperature sampling circuit in motor, wherein, the sampled point is
The corresponding sampled point of temperature detector in the motor temperature sampling circuit；
According to the sampled signal, fault detect is carried out to the motor temperature sampling circuit, obtain failure detection result.
2. motor temperature sampling circuit fault detection method according to claim 1, it is characterised in that also include：
According to the failure detection result, the fault level of motor is determined；
According to the fault level and the corresponding troubleshooting mode of default fault level, failure is processed.
3. motor temperature sampling circuit fault detection method according to claim 2, it is characterised in that the temperature detection
Device is the thermistor in the motor, and acquisition is arranged at the sampling letter of the sampled point in the motor temperature sampling circuit in motor
Number the step of include：
Obtain the thermistor corresponding voltage sample value and/or acquisition temperature-sensitive in the motor temperature sampling circuit
The corresponding temperature sampling value of resistance.
4. motor temperature sampling circuit fault detection method according to claim 3, it is characterised in that obtain the temperature-sensitive
Resistance includes in the motor temperature sampling circuit the step of corresponding voltage sample value：
The thermistor is obtained in the motor temperature sampling circuit relative to the first voltage value of supply voltage, institute is determined
First voltage value is stated for the corresponding voltage sample value of the thermistor；Wherein, one end ground connection of the thermistor, the other end
It is connected in series with first resistor (R1), the first resistor (R1) is connected with power supply.
5. motor temperature sampling circuit fault detection method according to claim 4, it is characterised in that by being arranged at
The voltage detector in motor temperature sampling circuit is stated, the first voltage value is obtained；The voltage detector and a low pass filtered
Wave circuit is connected, and the low-pass filter circuit is connected between the first resistor (R1) and the thermistor.
6. motor temperature sampling circuit fault detection method according to claim 5, it is characterised in that the LPF
Circuit includes：The second resistance between the first resistor (R1) and the thermistor is connected to, with the second resistance
First electric capacity (C1) of one end connection and the second electric capacity (C2) being connected with the second resistance other end, first electric capacity
(C1) it is grounded with second electric capacity (C2).
7. motor temperature sampling circuit fault detection method according to claim 3, it is characterised in that obtain the temperature-sensitive
The step of resistance corresponding temperature sampling value, includes：
Obtain the thermistor corresponding resistance value in the motor temperature sampling circuit；
According to the corresponding resistance value of the thermistor, and resistance value and the temperature value of the thermistor corresponding relation,
Obtain the corresponding temperature sampling value of the thermistor.
8. motor temperature sampling circuit fault detection method according to claim 7, it is characterised in that obtain the temperature-sensitive
Resistance includes in the motor temperature sampling circuit the step of corresponding resistance value：
By V (supply voltage)/(R1+R0)=V1/R0, the resistance value (R0) of the thermistor is determined；Wherein, the temperature-sensitive
One end ground connection of resistance, the other end is connected with first resistor (R1), and the first resistor (R1) is connected with power supply, and V1 is the heat
The corresponding first voltage value of quick resistance.
9. motor temperature sampling circuit fault detection method according to claim 3, it is characterised in that according to the sampling
Signal, fault detect is carried out to the motor temperature sampling circuit, is included the step of obtain failure detection result：
If any one the corresponding voltage sample value in the multiple thermistors set on the motor is more than first voltage threshold
Value, it is determined that power supply short circuit or open circuit fault occurs in the corresponding motor temperature sampling circuit of the thermistor.
10. motor temperature sampling circuit fault detection method according to claim 3, it is characterised in that adopted according to described
Sample signal, fault detect is carried out to the motor temperature sampling circuit, is included the step of obtain failure detection result：
If in the difference of the corresponding temperature sampling value of any two difference in the multiple thermistors set on the motor most
Big value, more than preset temperature threshold value, it is determined that the motor occurrence temperature verifies abnormal failure.
11. motor temperature sampling circuit fault detection methods according to claim 3, it is characterised in that adopted according to described
Sample signal, fault detect is carried out to the motor temperature sampling circuit, is included the step of obtain failure detection result：
Judge any one the corresponding voltage sample value in the multiple thermistors set on the motor whether more than first
Voltage threshold；If, it is determined that there is power supply short circuit or open circuit event in the corresponding motor temperature sampling circuit of the thermistor
Whether barrier, otherwise, judge any one the corresponding voltage sample value in multiple thermistors less than second voltage threshold value；
When the corresponding voltage sample value of any one thermistor is less than second voltage threshold value, determine that the thermistor is corresponding
There is shorted to earth failure in the motor temperature sampling circuit；
When the voltage sample value of multiple thermistors is respectively positioned between the first voltage threshold value and the second voltage threshold value,
Judge that whether any two in multiple thermistors distinguishes the maximum in the difference of corresponding temperature sampling value more than default temperature
Degree threshold value, if, it is determined that the motor occurrence temperature verifies abnormal failure.
The 12. motor temperature sampling circuit fault detection method according to claim 9,10 or 11, it is characterised in that described
Multiple thermistors are uniformly arranged on the circumference of the stator of the motor.
13. motor temperature sampling circuit fault detection methods according to claim 11, it is characterised in that according to the event
The step of barrier testing result, fault level for determining motor, includes：
When power supply short circuit failure, open circuit fault or right occurs in the corresponding motor temperature sampling circuit of multiple thermistors
During any one in ground short circuit failure, the fault level for determining the motor is the first estate；
When the quantity for the motor temperature sampling circuit of power supply short circuit failure, open circuit fault or shorted to earth failure occur is big
During in zero and less than N, the fault level of the motor is determined for the second grade, wherein N is the quantity of multiple thermistors, a heat
Quick resistance corresponds to a motor temperature sampling circuit；
When it is determined that the motor occurrence temperature verifies abnormal failure, the fault level for determining the motor is the tertiary gradient.
14. motor temperature sampling circuit fault detection methods according to claim 13, it is characterised in that according to the event
Barrier grade and the corresponding troubleshooting mode of default fault level, include the step of process failure：
When the fault level of the motor is the first estate, using the corresponding first preset failure alerting pattern of the first estate,
Reminded；
When the fault level of the motor is the second grade, using the corresponding second preset failure alerting pattern of the second grade,
Reminded；
When the fault level of the motor is the tertiary gradient, using the corresponding 3rd preset failure alerting pattern of the tertiary gradient,
Reminded.
A kind of 15. motor temperature sampling circuit failure detector circuits, it is characterised in that including：
Controller, at least one motor temperature sampling circuit being connected with controller；
The motor temperature sampling circuit includes：The first resistor being connected with power supply, the temperature inspection connected with the first resistor
Survey device；
The controller, the sampled signal for obtaining the sampled point in the motor temperature sampling circuit being arranged in motor, its
In, during the sampled point is the motor temperature sampling circuit, the corresponding sampled point of the temperature detector；And adopted according to described
Sample signal, fault detect is carried out to the motor temperature sampling circuit, obtains failure detection result.
16. motor temperature sampling circuit failure detector circuits according to claim 15, it is characterised in that
The controller is additionally operable to determine according to the failure detection result fault level of motor；According to the fault level
And the corresponding troubleshooting mode of default fault level, failure is processed.
The 17. motor temperature sampling circuit failure detector circuit according to claim 15 or 16, it is characterised in that the temperature
Degree detector is thermistor；
The motor temperature sampling circuit includes：Low-pass filter circuit and voltage detector, the low-pass filter circuit connection
Between the first resistor (R1) and the thermistor, the voltage detector is connected with the low-pass filter circuit.
18. motor temperature sampling circuit failure detector circuits according to claim 17, it is characterised in that
The low-pass filter circuit includes：Second resistance between the first resistor (R1) and the thermistor is connected to, with
First electric capacity (C1) of one end connection of the second resistance and the second electric capacity being connected with the second resistance other end
(C2), first electric capacity (C1) and second electric capacity (C2) are grounded.
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