CN110187180A - A kind of detection method of vehicle resistance value - Google Patents
A kind of detection method of vehicle resistance value Download PDFInfo
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- CN110187180A CN110187180A CN201910522157.3A CN201910522157A CN110187180A CN 110187180 A CN110187180 A CN 110187180A CN 201910522157 A CN201910522157 A CN 201910522157A CN 110187180 A CN110187180 A CN 110187180A
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- resistance value
- resistance
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- resiso
- value
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
Abstract
The present invention provides a kind of detection methods of vehicle resistance value.The present invention passes through power amplifier to RC circuit output PWM wave, the detection method comprises the following steps: step 1: carrying out RC waveform sampling, and the PWM waveform of operational amplifier output is acquired, while input resistance value computing module, calculate optimal resistance value Resiso；Step 2: the resistance value isoR on high-tension battery face vehicle body ground is calculated by resistance value computing module1With the negative resistance value isoR to vehicle body ground of high-tension battery2；Step 3:PWM output module calculates the output duty cycle of PWM wave, feeds back to operational amplifier.The present invention can accurately detect out high-tension battery bus to the resistance value on vehicle body ground, and detection time is short, and detection efficiency is high, improve the safety of vehicle.
Description
Technical field
The present invention relates to new-energy automobile fields, more particularly to a kind of detection method of vehicle resistance value.
Background technique
Domestic new-energy automobile growth momentum is swift and violent in recent years, has formed one around the huge new of electric car industry
Emerging industrial chain.The resistance value of electric car, can be with overall wire sheaves aging, the reasons such as there was dampness in the air or electronic control unit is surprisingly damaged
It reduces, after resistance value is lower than certain value, life danger can be caused to driver and passenger.It is required according to national standard GBT18384.3,
Need to ensure vehicle insulation resistance > 1000 Ω/V.Insulation monitoring function is essential function on new-energy automobile.In vehicle
When insulation resistance value is declined to a certain extent, insulation fault is quoted, entire car controller is allowed to cut off vehicle power supply, ensures driver and passenger
Safety.
Insulation detection device is exactly a kind of online real-time for the progress of the state of insulation of DC power system bus and branch
Detection with management device, be typically integrated in BMU (battery management unit), but with the variation in industry, Insulation monitoring
Have the tendency that separating from bmu, separately as a modular unit.
Realize that Insulation monitoring, major way have bridge method detection method and low frequency waveform injection method.
Bridge method is access and off resistance between bus and vehicle body ground, when according to access and disconnecting, to busbar voltage
Data are divided, partial pressure calculating is carried out, obtains insulation resistance.This measurement bill could start to survey after needing bus to access battery pack
Amount, the measurement accuracy of insulation resistance value can be influenced by battery pack total voltage.Resistance, which can be accessed, in test causes insulation resistance value to reduce,
It is easy to damage to operate the switching component that electric bridge access disconnects.
Low frequency waveform injection method is that low frequency PWM wave is injected on insulation resistance by an output capacitance, is exported at this time
Capacitor and insulation resistance constitute RC charge-discharge circuit.Insulation resistance is calculated according to RC voltage waveform.This scheme is without relying upon electricity
Pond packet power detecting just can detect insulation resistance value between bus and vehicle body before battery access.Without accessing resistance when test, no
The insulating properties of itself can be reduced, while output capacitance has DC isolation effect, it is safer than bridge method.But when motor works
Afterwards, the voltage change on bus will be injected back as clutter in test circuit, cause insulation resistance to calculate result distortion, need to filter
Wave rejects wrong data, causes detection time elongated.
Summary of the invention
To solve the above problems, the present invention provides a kind of detection method of vehicle resistance value, this method can be examined accurately
High-tension battery bus is measured to the resistance value on vehicle body ground, detection time is short, and detection efficiency is high, improves the safety of vehicle.
The technical solution adopted by the present invention to solve the technical problems is: a kind of detection method of vehicle resistance value, the party
Method is by power amplifier to RC circuit output PWM wave, and the RC circuit is by output capacitance C, output resistance R and measured resistance
Re is sequentially connected in series to be formed, and the measured resistance Re is resistance value of the vehicle high-tension battery bus to vehicle body ground, the detection
Method the following steps are included:
1) step 1: RC waveform sampling is carried out between output resistance R and output capacitance C, and acquires the defeated of operational amplifier
Collected RC waveform and PWM waveform input the resistance value computing module are passed through Kalman filtering by PWM waveform out
The optimal resistance value Resiso of measured resistance Re is calculated, which is the resistance value isoR on high-tension battery face vehicle body ground1
With the negative resistance value isoR to vehicle body ground of high-tension battery2Parallel value；
2) step 2: the resistance value computing module calculates separately the resistance value isoR on high-tension battery face vehicle body ground1With
The negative resistance value isoR to vehicle body ground of high-tension battery2；
3) step 3:PWM output module is according to the calculated isoR of step 21And isoR2, calculate the output duty of PWM wave
Than feeding back to the operational amplifier.
Further, step 1 includes following sub-step:
1) step 1a): the single calculation resistance value Resiso of measured resistance Re is calculated by mapping toroidal function1:
Resiso1=f (Vamplitude, Vsquare, Temp, PWMcycle, t)
Wherein:
F is mapping toroidal function；
VamplitudeFor the amplitude of the single PWM waveform of operational amplifier output；
VsquareFor the PWM waveform of operational amplifier output；
PWMcycleFor the period of the PWM wave of operational amplifier output；
Temp is Current Temperatures；
T is clock timing；
2) step 1b): another single calculation electricity of measured resistance Re is calculated with the method for being different from mapping toroidal function
Resistance value Resiso2；
3) step 1c): according to Resiso1And Resiso2, optimal resistance value Resiso is calculated with Kalman filtering:
Wherein:
K representative calculates back number, and k-1 represents last computation；
H is Resiso1Last time value and last time optimal value difference,
H=Resiso (k-1)-Resiso1(k-1)；
MaxT () indicates the Resiso in multiple PWM waveform periods1Maximum value；
MinT () indicates the Resiso in multiple PWM waveform periods1Minimum value；
Z is Resiso2Noise figure, i.e., Resiso in multiple PWM waveform periods2Maximum value and Resiso2The difference of minimum value
Value.
Further, step 2 passes through the following resistance value isoR that high-tension battery face vehicle body ground is calculated1, and
The negative resistance value isoR to vehicle body ground of high-tension battery2:
Wherein:
VBatteryFor the measured value of high-tension battery total voltage；
VresisoFor the measured value of the high-voltage electricity pressure difference on high-tension battery face vehicle body ground.
Further, step 3 passes through the following output duty cycle that PWM wave is calculated:
PwmFreq=f (isoR1, isoR2)+2×C×(Resiso+R)
Wherein:
PwmFreqFor the frequency for the PWM wave that the PWM output module exports；
C is the capacitance value of output capacitance；
R is the resistance value of output resistance.
Further, step 1b) by following steps calculate Resiso2:
1) step 1b-1): calculate the single resistance of measured resistance Re in RC waveform sampling period when RC circuit charges
Value
Resisoi2:
Resisoi2=(Vwave-Vc)/(Vr/R)
Wherein:
Vc is the pressure drop on output capacitance C；
T is the time cycle of PWM wave；
VwaveVoltage value between output capacitance and output resistance；
VsquareFor the voltage value of the PWM wave of operational amplifier output；
R is the resistance value of output resistance；
C is the capacitance of output capacitance；
Vr is the pressure drop on output resistance R；
VcmaxFor the maximum value of output capacitance C pressure drop in the current PWM wave period；
VcminFor the minimum value of capacitor C pressure drop in the current PWM wave period；
Resisoi2For the resistance value of single in a RC waveform sampling period.
2) step 1b-2): calculate RC circuit discharging when RC waveform sampling period in measured resistance Re single resistance
Value
Resisoi2
Resisoi2=(Vc-Vwave)/(Vr/R)
3) step 1b-3): calculate Resisoi in a PWM waveform period2Average value, obtain calculated result Resiso2:
Wherein:
TsamplingFor the sampling period of RC waveform.
Further, the output resistance R is connected in series by multiple resistance.
Further, the output resistance R is connected in series by three resistance.
The beneficial effects of the present invention are: 1) it is capable of the insulating resistance value of real-time detection vehicle；2) setting PWM waveform is fed back
Module can change the period of PWM waveform by the variation of resistance value in real time, in the case where guaranteeing precision, shorten waveform
Period shortens detection time, improves detection efficiency；3) there are Capacitor apart, safety between insulation resistance and high voltage bus
Property it is high.
Detailed description of the invention
1) Fig. 1 is the waveform diagram of PWM wave in the present invention.
2) Fig. 2 is the RC waveform diagram acquired between output resistance R and output capacitance C in the present invention.
Specific embodiment
In order to which objects and advantages of the present invention are more clearly understood, the present invention is carried out with reference to embodiments further
It is described in detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used in the restriction present invention.
The embodiment is illustrated with reference to the accompanying drawing.
Fig. 1 is the waveform diagram of PWM wave in the present invention, and Fig. 2 is acquired between output resistance R and output capacitance C in the present invention
RC waveform diagram.
A kind of detection method of vehicle resistance value, this method by power amplifier to RC circuit output PWM wave, it is described
RC circuit is sequentially connected in series and is formed by output capacitance C, output resistance R and measured resistance Re, and the measured resistance Re is that vehicle is high
Resistance value of the piezoelectric battery bus to vehicle body ground, which is characterized in that the detection method comprises the following steps:
1) step 1: RC waveform sampling is carried out between output resistance R and output capacitance C, and acquires the defeated of operational amplifier
Collected RC waveform and PWM waveform input the resistance value computing module are passed through Kalman filtering by PWM waveform out
The optimal resistance value Resiso of measured resistance Re is calculated, which is the resistance value isoR on high-tension battery face vehicle body ground1
With the negative resistance value isoR to vehicle body ground of high-tension battery2Parallel value；
2) step 2: the resistance value computing module calculates separately the resistance value isoR on high-tension battery face vehicle body ground1With
The negative resistance value isoR to vehicle body ground of high-tension battery2；
3) step 3:PWM output module is according to the calculated resistance value isoR of step 21And isoR2, calculate the output of PWM wave
Duty ratio feeds back to the operational amplifier.
In the present embodiment, step 1 includes following sub-step:
1) step 1a): the single calculation resistance value Resiso of measured resistance Re is calculated by mapping toroidal function1:
Resiso1=f (Vamplitude, Vsquare, Temp, PWMcycle, t)
Wherein:
F is mapping toroidal function；
VamplitudeFor the amplitude of the single PWM waveform of operational amplifier output；
VsquareFor the PWM waveform of operational amplifier output；
PWMcycleFor the period of the PWM wave of operational amplifier output；
Temp is Current Temperatures；
T is clock timing；
2) step 1b): another single calculation electricity of measured resistance Re is calculated with the method for being different from mapping toroidal function
Resistance value Resiso2, in the present embodiment, Resiso is calculated by following steps2:
Step 1b-1): when PWM waveform is in high voltage, RC circuit is charged state, is calculated primary when the charging of RC circuit
The single resistance value Resisoi of measured resistance Re in the RC waveform sampling period2:
Resisoi2=(Vwave-Vc)/(Vr/R)
Wherein:
Vc is the pressure drop on output capacitance C；
T is the time cycle of PWM wave；
VwaveVoltage value between output capacitance and output resistance；
VsquareFor the voltage value of the PWM wave of operational amplifier output；
R is the resistance value of output resistance；
C is the capacitance of output capacitance；
Vr is the pressure drop on output resistance R；
VcmaxFor the maximum value of output capacitance C pressure drop in the current PWM wave period；
VcminFor the minimum value of capacitor C pressure drop in the current PWM wave period；
Resisoi2For the resistance value of single in a RC waveform sampling period.
Step 1b-2): when PWM waveform is in low-voltage, RC circuit is discharge condition, is calculated primary when RC circuit discharging
The single resistance value Resisoi of measured resistance Re in the RC waveform sampling period2
Resisoi2=(Vc-Vwave)/(Vr/R)
Step 1b-3): calculate Resisoi in a PWM waveform period2Average value, obtain calculated result Resiso2:
Wherein:
TsamplingFor the sampling period of RC waveform.
3) step 1c): according to Resiso1And Resiso2, optimal resistance value Resiso is calculated with Kalman filtering:
Wherein:
K representative calculates back number, and k-1 represents last computation；
H is Resiso1Last time value and last time optimal value difference,
H=Resiso (k-1)-Resiso1(k-1)；
MaxT () indicates the Resiso in multiple PWM waveform periods1Maximum value；
MinT () indicates the Resiso in multiple PWM waveform periods1Minimum value；
Z is Resiso2Noise figure, i.e., Resiso in multiple PWM waveform periods2Maximum value and Resiso2The difference of minimum value
Value.
In the present embodiment, step 2 passes through the following resistance value isoR that high-tension battery face vehicle body ground is calculated1, and
The negative resistance value isoR to vehicle body ground of high-tension battery2:
Wherein:
VBatteryFor the measured value of high-tension battery total voltage；
VresisoFor the measured value of the high-voltage electricity pressure difference on high-tension battery face vehicle body ground.
Step 3 passes through the following output duty cycle that PWM wave is calculated:
PwmFreq=f (isoR1, isoR2)+2×C×(Resiso+R)
Wherein:
PwmFreqFor the frequency for the PWM wave that the PWM output module exports；
C is the capacitance value of output capacitance；
R is the resistance value of output resistance.
The output resistance R is connected in series by multiple resistance, in the present embodiment output resistance R connected by three resistance and
At.
The present invention provides a kind of detection method of vehicle resistance value, this method is capable of the insulation resistance of real-time detection vehicle
Value can be changed the period of PWM waveform in real time, guaranteed by the way that PWM waveform feedback module is arranged by the variation of resistance value
In the case where precision, shortens the period of injection waveform, shorten detection time, improve detection efficiency；In addition, insulation resistance and
There are Capacitor aparts between high voltage bus, highly-safe.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the principle of the present invention, it can also make several improvements and retouch, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (7)
1. a kind of detection method of vehicle resistance value, this method passes through power amplifier to RC circuit output PWM wave, the RC
Circuit is sequentially connected in series and is formed by output capacitance C, output resistance R and measured resistance Re, and the measured resistance Re is vehicle high pressure
Resistance value of the battery power feeds to vehicle body ground, which is characterized in that the detection method comprises the following steps:
1) step 1: carrying out RC waveform sampling between output resistance R and output capacitance C, and acquires operational amplifier output
PWM waveform calculates collected RC waveform and PWM waveform input resistance value computing module tested by Kalman filtering
The optimal resistance value Resiso of resistance Re, the resistance value are the resistance value isoR on high-tension battery face vehicle body ground1And high-tension battery
The negative resistance value isoR to vehicle body ground2Parallel value；
2) step 2: the resistance value computing module calculates separately the resistance value isoR on high-tension battery face vehicle body ground1And high pressure
The negative resistance value isoR to vehicle body ground of battery2；
3) step 3:PWM output module is according to the calculated isoR of step 21And isoR2, the output duty cycle of PWM wave is calculated, instead
Operational amplifier described in feeding.
2. a kind of detection method of vehicle resistance value as described in claim 1, which is characterized in that step 1 includes following sub-step
It is rapid:
1) step 1a): the single calculation resistance value Resiso of measured resistance Re is calculated by mapping toroidal function1:
Resiso1=f (Vamplitude,Vsquare,Temp,PWMcycle,t)
Wherein:
F is mapping toroidal function；
VamplitudeFor the amplitude of the single PWM waveform of operational amplifier output；
VsquareFor the PWM waveform of operational amplifier output；
PWMcycleFor the period of the PWM wave of operational amplifier output；
Temp is Current Temperatures；
T is clock timing；
2) step 1b): another single calculation resistance value of measured resistance Re is calculated with the method for being different from mapping toroidal function
Resiso2；
3) step 1c): according to Resiso1And Resiso2, optimal resistance value Resiso is calculated with Kalman filtering:
Wherein:
K representative calculates back number, and k-1 represents last computation；
H is Resiso1Last time value and last time optimal value difference,
H=Resiso (k-1)-Resiso1(k-1)；
MaxT () indicates the Resiso in multiple PWM waveform periods1Maximum value；
MinT () indicates the Resiso in multiple PWM waveform periods1Minimum value；
Z is Resiso2Noise figure, i.e., Resiso in multiple PWM waveform periods2Maximum value and Resiso2The difference of minimum value.
3. a kind of detection method of vehicle resistance value as described in claim 1, which is characterized in that step 2 passes through following calculating
Obtain the resistance value isoR on high-tension battery face vehicle body ground1And the negative resistance value isoR to vehicle body ground of high-tension battery2:
Wherein:
VBatteryFor the measured value of high-tension battery total voltage；
VresisoFor the measured value of the high-voltage electricity pressure difference on high-tension battery face vehicle body ground.
4. a kind of detection method of vehicle resistance value as described in claim 1, which is characterized in that step 3 passes through following calculating
Obtain the output duty cycle of PWM wave:
PwmFreq=f (isoR1,isoR2)+2×C×(Resiso+R)
Wherein:
PwmFreqFor the frequency for the PWM wave that the PWM output module exports；
C is the capacitance value of output capacitance；
R is the resistance value of output resistance.
5. a kind of detection method of vehicle resistance value as claimed in claim 2, which is characterized in that step 1b) pass through following step
It is rapid to calculate Resiso2:
1) step 1b-1): calculate the single resistance value of measured resistance Re in RC waveform sampling period when RC circuit charges
Resisoi2:
Resisoi2=(Vwave-Vc)/(Vr/R)
Wherein:
Vc is the pressure drop on output capacitance C；
T is the time cycle of PWM wave；
VwaveVoltage value between output capacitance and output resistance；
VsquareFor the voltage value of the PWM wave of operational amplifier output；
R is the resistance value of output resistance；
C is the capacitance of output capacitance；
Vr is the pressure drop on output resistance R；
VcmaxFor the maximum value of output capacitance C pressure drop in the current PWM wave period；
VcminFor the minimum value of capacitor C pressure drop in the current PWM wave period；
Resisoi2For the resistance value of single in a RC waveform sampling period.
2) step 1b-2): calculate RC circuit discharging when RC waveform sampling period in measured resistance Re single resistance value
Resisoi2
Resisoi2=(Vc-Vwave)/(Vr/R)
3) step 1b-3): calculate Resisoi in a PWM waveform period2Average value, obtain calculated result Resiso2:
Wherein:
TsamplingFor the sampling period of RC waveform.
6. a kind of detection method of vehicle resistance value as described in claim 1, which is characterized in that the output resistance R by
Multiple resistance are connected in series.
7. a kind of detection method of vehicle resistance value as claimed in claim 6, which is characterized in that the output resistance R by
Three resistance are connected in series.
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Cited By (1)
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| CN112083299A (en) * | 2020-09-11 | 2020-12-15 | 国网重庆市电力公司北碚供电分公司 | Direct current system insulation fault prediction method based on Kalman filtering |
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