CN104502712A - Insulation detection control device and control method for electric automobile power system - Google Patents
Insulation detection control device and control method for electric automobile power system Download PDFInfo
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Abstract
The invention discloses an insulation detection control device and a control method for an electric automobile power system. The insulation detection control device comprises an insulation detection controller, a first switch, a second switch, an anode insulation detection device and a cathode insulation detection device, wherein an anode of a power storage battery pack is connected with a signal input end of the first switch, a control end of the first switch is connected with a control end of the insulation detection controller, a signal output end of the first switch is connected with a signal input end of the anode insulation detection device, a signal output end of the anode insulation detection device is connected with a signal input end of the insulation detection controller, a cathode of the power storage battery pack is connected with a signal input end of the second switch, a control end of the second switch is connected with the control end of the insulation detection controller, a signal output end of the second switch is connected with a signal input end of the cathode insulation detection device, and a signal output end of the cathode insulation detection device is connected with the signal input end of the insulation detection controller.
Description
Technical field
The present invention relates to automation control area, particularly relate to a kind of power system of electric automobile Insulation monitoring control device and control method.
Background technology
On current electric automobile, the voltage of accumulator power system has all exceeded the safe voltage that human body can bear usually, and such as insulation ag(e)ing, paddle, the objective factor such as to drench with rain all can make original insulation resistance decline further, thus in use or maintenance process, Danger Electric shock risk is brought to use, maintenance personal, therefore, develop a kind of vehicle-mounted real-time high-efficiency, the electric automobile power battery system Insulation monitoring control device of low cost just seems necessary.
Summary of the invention
The present invention is intended at least solve the technical matters existed in prior art, especially innovatively proposes a kind of power system of electric automobile Insulation monitoring control device and control method.
In order to realize above-mentioned purpose of the present invention, the invention provides a kind of power system of electric automobile Insulation monitoring control device, its key is, comprising: Insulation monitoring controller, the first switch, second switch, positive pole insulation detection device, negative insulation pick-up unit
Power accumulator group E1 positive pole connects the first switch signal input end, described first switch control terminal connects Insulation monitoring controller control end, described first switching signal output terminal connects positive pole insulation detection device signal input part, and described positive pole insulation detection device signal output part connects Insulation monitoring controller signals input end;
Power accumulator group E1 negative pole connects second switch signal input part, described second switch control end connects Insulation monitoring controller control end, described second switch signal output part connects negative insulation pick-up unit signal input part, and described negative insulation pick-up unit signal output part connects Insulation monitoring controller signals input end.
Described power system of electric automobile Insulation monitoring control device, preferably, also comprises: the 3rd resistance and the 4th resistance,
Described 3rd resistance one end is connected between power accumulator group E1 positive pole and the first switch signal input end, the described 3rd resistance other end connects electric motor car electricity chassis, described 4th resistance one end is connected between power accumulator group E1 negative pole and second switch signal input part, and the described 4th resistance other end connects electric motor car electricity chassis.
Described power system of electric automobile Insulation monitoring control device, preferably, described positive pole insulation detection device comprises: the first resistance, the second resistance, the first field effect transistor, the second field effect transistor, the first insulation resistance Ro1,
First resistance one end connects the first switch link, the described first resistance other end connects second resistance one end and Insulation monitoring controller signals input end respectively, the described second resistance other end connects the first field effect transistor drain electrode, described first fet gate connects Insulation monitoring controller control end, described first field effect transistor source electrode connects the second field effect transistor source electrode and electric motor car electricity chassis respectively, described second fet gate connects Insulation monitoring controller control end, described second field effect transistor drain electrode connection first insulation resistance Ro1 one end, the described first insulation resistance Ro1 other end connects the first switching signal output terminal.
Described power system of electric automobile Insulation monitoring control device, preferably, described negative insulation pick-up unit comprises: the 5th resistance, the 6th resistance, the 3rd field effect transistor, the 4th field effect transistor, the second insulation resistance Ro2,
3rd field effect transistor source electrode connects second switch signal output part, described 3rd field effect transistor drain electrode connection second insulation resistance Ro2 one end, the described second insulation resistance Ro2 other end connects electric motor car electricity chassis, described second switch signal output part also connects the 4th field effect transistor source electrode, described 4th field effect transistor drain electrode connection the 6th resistance one end, the described 6th resistance other end connects the 5th resistance one end and Insulation monitoring controller signals input end respectively, the described 5th resistance other end also connects the second insulation resistance Ro2, described 4th fet gate connects Insulation monitoring controller signals input end.
Described power system of electric automobile Insulation monitoring control device, preferably, also comprises: battery manager BMS and display device,
Described battery manager BMS signal input part is connected with Insulation monitoring controller signals output terminal by CAN, and described battery manager BMS signal output part connects display device, and described display device is for showing Insulation monitoring data and carrying out alarm indication.
The present invention also discloses a kind of power system of electric automobile Insulation monitoring control method, and its key is, comprises the steps:
Step 1, by device according to claim 1, test power accumulator group positive pole is to electric chassis voltage, thus whether detection insulating resistance value exceedes threshold value, judges whether alarm operation;
Step 2, by device according to claim 1, test power accumulator group negative pole is to electric chassis voltage, thus whether detection insulating resistance value exceedes threshold value, judges whether alarm operation.
Described power system of electric automobile Insulation monitoring control method, preferably, described step 1 comprises:
Step 1-1, first switch control terminal output signal of Insulation monitoring controller makes the first switch connection, first field effect transistor control end of Insulation monitoring controller exports high level signal makes the first field effect transistor saturation conduction, and the second field effect transistor control end output low level signal of Insulation monitoring controller makes the second field effect transistor cut-off disconnect; The second switch control end output signal of Insulation monitoring controller makes second switch be in off-state, passes through formula:
VR3+VR4＝VE1，
VR1+VR2＝VR3，
VR2＝R2×VR3÷(R1+R2)，
In above formula, VR3 is pressure drop on the 3rd resistance, and VR4 is pressure drop on the 4th resistance, and VE1 is the total voltage of battery pack, and VR1 is pressure drop on the first resistance, and VR2 is pressure drop on the second resistance; After using the second ohmically dividing potential drop to be sent to an A/D signal input part of Insulation monitoring controller, the second ohmically pressure drop VR2 is out tested, the magnitude of voltage of this VR2 is substituted into following formula and obtains
VR3＝(R1+R2)×VR2÷R2。
Described power system of electric automobile Insulation monitoring control method, preferably, described step 2 comprises:
Step 2-1, the second switch control end output signal of Insulation monitoring controller makes second switch connect, 4th field effect transistor control end of Insulation monitoring controller exports high level signal makes the 4th field effect transistor saturation conduction, 3rd field effect transistor control end output low level signal of Insulation monitoring controller makes the 3rd field effect transistor cut-off disconnect, first switch control terminal output signal of Insulation monitoring controller makes the first switch be in off-state, as shown in the formula:
VR5+VR6＝VR4，
In above formula, VR4 is pressure drop on the 4th resistance, VR5 is pressure drop on the 5th resistance, VR6 is pressure drop on the 6th resistance, after using the 5th ohmically dividing potential drop to be sent to the 2nd A/D signal input part of Insulation monitoring controller, 5th ohmically pressure drop VR5 is out tested, by the magnitude of voltage of this VR5 substitute into VR5=R5 × VR4 ÷ (R5+R6), obtain as shown in the formula:
VR4＝(R5+R6)×VR5÷R5。
Described power system of electric automobile Insulation monitoring control method, preferably, described step 1 comprises:
Step 1-2, Insulation monitoring controller compares VR3 and VR4, if VR3 > is VR4, the 3rd resistance > the 4th resistance is described, in order to test the 4th resistance, introduces the first insulation resistance of known value;
First switch control terminal output signal of Insulation monitoring controller makes the first switch connection, first field effect transistor control end of Insulation monitoring controller exports high level signal makes the first field effect transistor saturation conduction, and the second field effect transistor control end of Insulation monitoring controller exports high level signal makes the second field effect transistor saturation conduction; The second switch control end output signal of Insulation monitoring controller makes second switch be in off-state, and now the first insulation resistance and the 3rd resistor coupled in parallel, if parallel connection is R3
1, following formula:
VR3
1＝(R1+R2)×VR2
1÷R2，
According to the method for testing of step 1-1, VR2
1also recorded by Insulation monitoring controller, thus obtain VR3 by above formula
1.
Described power system of electric automobile Insulation monitoring control method, preferably, described step 2 comprises:
Step 2-1, if VR4 > is VR3, illustrates the 4th resistance > the 3rd resistance, in order to test the 3rd resistance, introduces the second insulation resistance of known value,
The second switch control end output signal of Insulation monitoring controller makes second switch connect, 4th field effect transistor control end of Insulation monitoring controller exports high level signal makes the 4th field effect transistor saturation conduction, and the 3rd field effect transistor control end of Insulation monitoring controller exports high level signal makes the 3rd field effect transistor saturation conduction; First switch control terminal output signal of Insulation monitoring controller makes the first switch be in off-state, and now the second insulation resistance and the 4th resistor coupled in parallel, if parallel connection is R4
1, as shown in the formula:
VR4
1＝(R5+R6)×VR5
1÷R5，
According to the method for testing that step 2-1 uses, VR5
1recorded by Insulation monitoring controller, thus obtain VR4 by above formula formula
1.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
What adopt due to this device is precision resistance examination survey method, simpler than employing external voltage method of testing circuit, cost decline; When needing to adopt special isolation testing tool to keep in repair or detect the insulation resistance of vehicle, can be in off-state by first, second switch of PC control, also can be that hand switch controls by first, second switch-linear hybrid.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is circuit theory connection layout of the present invention;
Fig. 2 is the 1st pacing examination battery anode voltage equivalent circuit diagram of the present invention;
Fig. 3 is the 2nd pacing examination battery electrode voltage equivalent circuit diagram of the present invention;
Fig. 4 is the 3rd pacing examination battery anode voltage equivalent circuit diagram of the present invention;
Fig. 5 is the 4th pacing examination battery electrode voltage equivalent circuit diagram of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
In describing the invention, it will be appreciated that, term " longitudinal direction ", " transverse direction ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", the orientation of the instruction such as " outward " or position relationship be based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.
In describing the invention, unless otherwise prescribed and limit, it should be noted that, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
The object of this invention is to provide a kind of electric automobile power battery system Insulation monitoring control device, this device travels at vehicle and detects the positive pole of electrokinetic cell system E1 in charging in real time, negative pole is respectively to the insulation resistance of electric chassis (car body), when the secondary insulation resistance value that the insulating resistance value < recorded allows (500 Ω/V), first this device passes to battery manager BMS by CAN secondary insulation Resistance Fault, battery manager BMS controls Displaying Meter and carries out the warning of secondary insulation resistance optical flare, prompting vehicle driver, when the one-level insulating resistance value that the insulating resistance value < recorded allows (100 Ω/V), this device by CAN one-level insulation resistance fault delivery to battery manager BMS, while battery manager BMS control Displaying Meter carries out the warning of one-level insulation resistance optical flare, disconnected by the battery manager BMS control positive and negative electrode of electrokinetic cell system and the power motor of vehicle, to ensure the insulation safety of personnel and vehicle again.
In FIG, first switch, second switch is relay, described first switch, second switch effect adopts other special isolation testing tool to keep in repair or detect vehicle insulation system and arrange to solve, first switch at ordinary times, second switch is normally closed on-state, E1 is power accumulator group, Q1, Q2, Q3, Q4 is N-type field effect transistor, resistance R1+R2=resistance R5+R6 >=10M Ω, R2=R5=1%R1, R1=R6, resistance R1, R2, R5, R6 is the precision resistance of known value, Ro1=Ro2 (calculates by the nominal voltage of power accumulator according to the precision resistance of the known value of 500 Ω/V configurations, during nominal voltage=320V as power accumulator, Ro1=500 × 320=160K Ω.), resistance R3 and R4 is respectively power accumulator group positive and negative electrode to the insulation resistance on electric chassis, be generally finite resistive value, and the two is general also unequal, in R3 or R4, any one exceedes permissible value, be system insulation and exceed permissible value, a namely little resistance value is the insulating resistance value of system, and system carries out reporting to the police and controlling by setup program.
During use, as follows insulation resistance R3 and R4 is tested respectively:
1st step, test battery pack positive pole is to electric chassis voltage VR3:
First switch control terminal A4 output signal of Insulation monitoring controller makes the first switch connection, first field effect transistor control end A2 of Insulation monitoring controller exports high level signal makes the first field effect transistor Q1 saturation conduction, and the second field effect transistor control end A3 output low level signal of Insulation monitoring controller makes the second field effect transistor Q2 cut-off disconnect; The second switch control end A5 output signal of Insulation monitoring controller makes second switch be in off-state, because conducting resistance during field effect transistor saturation conduction is tens milliohm magnitudes, this tens Milliohm resistance does not affect test circuit, be equivalent to short circuit, now there is equivalent electrical circuit as Fig. 2, had by Fig. 2:
VR3+VR4＝VE1 (1)
VR1+VR2＝VR3 (2)
VR2＝R2×VR3÷(R1+R2) (3)
In above-mentioned (1), (2), (3) formula, VR3 is pressure drop on insulation resistance R3, and VR4 is pressure drop on insulation resistance R4, and VE1 is the total voltage of battery pack, and VR1 is pressure drop on precision resistance R1, and VR2 is pressure drop on precision resistance R2; Because R1 and R2 is accurate known resistance, after the dividing potential drop under Fig. 2 uses on R2 is sent to an A/D signal input part A1 of Insulation monitoring controller, the pressure drop VR2 on resistance R2 is out tested, the magnitude of voltage of this VR2 is substituted into (3) formula, obtains
VR3＝(R1+R2)×VR2÷R2 (4)
2nd step, test battery pack negative pole is to electric chassis voltage VR4:
The second switch control end A5 output signal of Insulation monitoring controller makes second switch connect, 4th field effect transistor control end A8 of Insulation monitoring controller exports high level signal makes the 4th field effect transistor Q1 saturation conduction, 3rd field effect transistor control end A6 output low level signal of Insulation monitoring controller makes the 3rd field effect transistor Q3 cut-off disconnect, and the first switch control terminal A4 output signal of Insulation monitoring controller makes the first switch be in off-state; Now there is equivalent electrical circuit as Fig. 3, had by Fig. 3:
VR5+VR6＝VR4 (5)
VR5＝R5×VR4÷(R5+R6) (6)
(5) in formula, VR4 is pressure drop on insulation resistance R4, and VR5 is pressure drop on precision resistance R5, and VR6 is pressure drop on precision resistance R6; Because R5 and R6 is accurate known resistance, after dividing potential drop under Fig. 3 uses on R5 is sent to the 2nd A/D signal input part A7 of Insulation monitoring controller, pressure drop VR5 on resistance R5 tested out (negative pressure can carry out absolute value process), the magnitude of voltage of this VR5 is substituted into (6) formula, obtain
VR4＝(R5+R6)×VR5÷R5 (7)
3rd step, Insulation monitoring controller compares VR3 and VR4, if VR3 > is VR4, insulation resistance R3 > R4 (leakage current flowing through R3 and R4 is equal) is described, system insulating resistance is determined by R4, in order to test R4, introduce the precision resistance Ro1 of known value.
First switch control terminal A4 output signal of Insulation monitoring controller makes the first switch connection, first field effect transistor control end A2 of Insulation monitoring controller exports high level signal makes the first field effect transistor Q1 saturation conduction, and the second field effect transistor control end A3 of Insulation monitoring controller exports high level signal makes the second field effect transistor Q2 saturation conduction; The second switch control end A5 output signal of Insulation monitoring controller makes second switch be in off-state, and now have equivalent electrical circuit as Fig. 4, now Ro1 and R3 is in parallel, if parallel connection is R3
1, had by Fig. 4:
VR3
1＝(R1+R2)×VR2
1÷R2 (8)
According to the method for testing that the 1st step uses, VR2
1also can be recorded by Insulation monitoring controller, thus obtain VR3 by (8) formula
1.
4th step, if VR4 > is VR3, insulation resistance R4 > R3 is described, system insulating resistance is determined by R3, in order to test R3, introduces the precision resistance Ro2 of known value.
The second switch control end A5 output signal of Insulation monitoring controller makes second switch connect, 4th field effect transistor control end A8 of Insulation monitoring controller exports high level signal makes the 4th field effect transistor Q4 saturation conduction, and the 3rd field effect transistor control end A6 of Insulation monitoring controller exports high level signal makes the 3rd field effect transistor Q3 saturation conduction; First switch control terminal A4 output signal of Insulation monitoring controller makes the first switch be in off-state, and now have equivalent electrical circuit as Fig. 5, now Ro2 and R4 is in parallel, if parallel connection is R4
1, had by Fig. 5:
VR4
1＝(R5+R6)×VR5
1÷R5 (9)
According to the method for testing that the 2nd step uses, VR5
1also can be recorded by Insulation monitoring controller, thus obtain VR4 by (9) formula
1.
The result that can obtain this device detection power accumulator group system insulation resistance to (9) formula by above-mentioned (1) formula is:
As VR3 > VR4,
Insulation resistance R4=(VR3-VR3
1) × Ro1 × (1+VR4 ÷ VR3) ÷ VR3
1
As VR4 > VR3,
Insulation resistance R3=(VR4-VR4
1) × Ro2 × (1+VR3 ÷ VR4) ÷ VR4
1
This device, according to recording after insulation resistance judges, is reported to the police accordingly and controls.
Described Insulation monitoring controller uses 89C51 and A/D converter and peripheral circuit to realize, or uses battery management system (BMS).
What adopt due to this device is precision resistance examination survey method, simpler than employing external voltage method of testing circuit, cost decline; When needing to adopt special isolation testing tool to keep in repair or detect the insulation resistance of vehicle, can be in off-state by first, second switch of PC control, also can be that hand switch controls by first, second switch-linear hybrid.
In the description of this instructions, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.
Claims (10)
1. a power system of electric automobile Insulation monitoring control device, is characterized in that, comprising: Insulation monitoring controller, the first switch, second switch, positive pole insulation detection device, negative insulation pick-up unit,
Power accumulator group (E1) positive pole connects the first switch signal input end, described first switch control terminal connects Insulation monitoring controller control end, described first switching signal output terminal connects positive pole insulation detection device signal input part, and described positive pole insulation detection device signal output part connects Insulation monitoring controller signals input end;
Power accumulator group (E1) negative pole connects second switch signal input part, described second switch control end connects Insulation monitoring controller control end, described second switch signal output part connects negative insulation pick-up unit signal input part, and described negative insulation pick-up unit signal output part connects Insulation monitoring controller signals input end.
2. power system of electric automobile Insulation monitoring control device according to claim 1, is characterized in that, also comprise: the 3rd resistance and the 4th resistance,
Described 3rd resistance one end is connected between power accumulator group (E1) positive pole and the first switch signal input end, the described 3rd resistance other end connects electric motor car electricity chassis, described 4th resistance one end is connected between power accumulator group (E1) negative pole and second switch signal input part, and the described 4th resistance other end connects electric motor car electricity chassis.
3. power system of electric automobile Insulation monitoring control device according to claim 1, it is characterized in that, described positive pole insulation detection device comprises: the first resistance, the second resistance, the first field effect transistor, the second field effect transistor, the first insulation resistance (Ro1)
First resistance one end connects the first switch link, the described first resistance other end connects second resistance one end and Insulation monitoring controller signals input end respectively, the described second resistance other end connects the first field effect transistor drain electrode, described first fet gate connects Insulation monitoring controller control end, described first field effect transistor source electrode connects the second field effect transistor source electrode and electric motor car electricity chassis respectively, described second fet gate connects Insulation monitoring controller control end, described second field effect transistor drain electrode connection first insulation resistance (Ro1) one end, described first insulation resistance (Ro1) other end connects the first switching signal output terminal.
4. power system of electric automobile Insulation monitoring control device according to claim 1, it is characterized in that, described negative insulation pick-up unit comprises: the 5th resistance, the 6th resistance, the 3rd field effect transistor, the 4th field effect transistor, the second insulation resistance (Ro2)
3rd field effect transistor source electrode connects second switch signal output part, described 3rd field effect transistor drain electrode connection second insulation resistance (Ro2) one end, described second insulation resistance (Ro2) other end connects electric motor car electricity chassis, described second switch signal output part also connects the 4th field effect transistor source electrode, described 4th field effect transistor drain electrode connection the 6th resistance one end, the described 6th resistance other end connects the 5th resistance one end and Insulation monitoring controller signals input end respectively, the described 5th resistance other end also connects the second insulation resistance (Ro2), described 4th fet gate connects Insulation monitoring controller signals input end.
5. power system of electric automobile Insulation monitoring control device according to claim 1, is characterized in that, also comprise: battery manager (BMS) and display device,
Described battery manager (BMS) signal input part is connected with Insulation monitoring controller signals output terminal by CAN, described battery manager (BMS) signal output part connects display device, and described display device is for showing Insulation monitoring data and carrying out alarm indication.
6. a power system of electric automobile Insulation monitoring control method, is characterized in that, comprises the steps:
Step 1, by device according to claim 1, test power accumulator group positive pole is to electric chassis voltage, thus whether detection insulating resistance value exceedes threshold value, judges whether alarm operation;
Step 2, by device according to claim 1, test power accumulator group negative pole is to electric chassis voltage, thus whether detection insulating resistance value exceedes threshold value, judges whether alarm operation.
7. power system of electric automobile Insulation monitoring control method according to claim 6, it is characterized in that, described step 1 comprises:
Step 1-1, first switch control terminal output signal of Insulation monitoring controller makes the first switch connection, first field effect transistor control end of Insulation monitoring controller exports high level signal makes the first field effect transistor saturation conduction, and the second field effect transistor control end output low level signal of Insulation monitoring controller makes the second field effect transistor cut-off disconnect; The second switch control end output signal of Insulation monitoring controller makes second switch be in off-state, passes through formula:
VR3+VR4＝VE1，
VR1+VR2＝VR3，
VR2＝R2×VR3÷(R1+R2)，
In above formula, VR3 is pressure drop on the 3rd resistance, and VR4 is pressure drop on the 4th resistance, and VE1 is the total voltage of battery pack, and VR1 is pressure drop on the first resistance, and VR2 is pressure drop on the second resistance; After using the second ohmically dividing potential drop to be sent to an A/D signal input part of Insulation monitoring controller, the second ohmically pressure drop VR2 is out tested, the magnitude of voltage of this VR2 is substituted into following formula and obtains
VR3＝(R1+R2)×VR2÷R2。
8. power system of electric automobile Insulation monitoring control method according to claim 6, it is characterized in that, described step 2 comprises:
Step 2-1, the second switch control end output signal of Insulation monitoring controller makes second switch connect, 4th field effect transistor control end of Insulation monitoring controller exports high level signal makes the 4th field effect transistor saturation conduction, 3rd field effect transistor control end output low level signal of Insulation monitoring controller makes the 3rd field effect transistor cut-off disconnect, first switch control terminal output signal of Insulation monitoring controller makes the first switch be in off-state, as shown in the formula:
VR5+VR6＝VR4，
In above formula, VR4 is pressure drop on the 4th resistance, VR5 is pressure drop on the 5th resistance, VR6 is pressure drop on the 6th resistance, after using the 5th ohmically dividing potential drop to be sent to the 2nd A/D signal input part of Insulation monitoring controller, 5th ohmically pressure drop VR5 is out tested, by the magnitude of voltage of this VR5 substitute into VR5=R5 × VR4 ÷ (R5+R6), obtain as shown in the formula:
VR4＝(R5+R6)×VR5÷R5。
9. power system of electric automobile Insulation monitoring control method according to claim 7, it is characterized in that, described step 1 comprises:
Step 1-2, Insulation monitoring controller compares VR3 and VR4, if VR3 > is VR4, the 3rd resistance > the 4th resistance is described, in order to test the 4th resistance, introduces the first insulation resistance of known value;
First switch control terminal output signal of Insulation monitoring controller makes the first switch connection, first field effect transistor control end of Insulation monitoring controller exports high level signal makes the first field effect transistor saturation conduction, and the second field effect transistor control end of Insulation monitoring controller exports high level signal makes the second field effect transistor saturation conduction; The second switch control end output signal of Insulation monitoring controller makes second switch be in off-state, and now the first insulation resistance and the 3rd resistor coupled in parallel, if parallel connection is R3
1, following formula:
VR3
1＝(R1+R2)×VR2
1÷R2，
According to the method for testing of step 1-1, VR2
1also recorded by Insulation monitoring controller, thus obtain VR3 by above formula
1.
10. power system of electric automobile Insulation monitoring control method according to claim 8, it is characterized in that, described step 2 comprises:
Step 2-1, if VR4 > is VR3, illustrates the 4th resistance > the 3rd resistance, in order to test the 3rd resistance, introduces the second insulation resistance of known value,
The second switch control end output signal of Insulation monitoring controller makes second switch connect, 4th field effect transistor control end of Insulation monitoring controller exports high level signal makes the 4th field effect transistor saturation conduction, and the 3rd field effect transistor control end of Insulation monitoring controller exports high level signal makes the 3rd field effect transistor saturation conduction; First switch control terminal output signal of Insulation monitoring controller makes the first switch be in off-state, and now the second insulation resistance and the 4th resistor coupled in parallel, if parallel connection is R4
1, as shown in the formula:
VR4
1＝(R5+R6)×VR5
1÷R5，
According to the method for testing that step 2-1 uses, VR5
1recorded by Insulation monitoring controller, thus obtain VR4 by above formula formula
1.
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