CN204903654U - Electric automobile is resistance measurement device a little on line - Google Patents
Electric automobile is resistance measurement device a little on line Download PDFInfo
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- CN204903654U CN204903654U CN201520481534.0U CN201520481534U CN204903654U CN 204903654 U CN204903654 U CN 204903654U CN 201520481534 U CN201520481534 U CN 201520481534U CN 204903654 U CN204903654 U CN 204903654U
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- electric automobile
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Abstract
The utility model provides an electric automobile is resistance measurement device a little on line, include the MCU signal processing and the the control unit that are connected with the CAN bus to and high voltage isolation probe, be provided with PGA amplifier circuit, AD converting circuit and DSP digital phase -locked loop amplifier circuit between MCU signal processing and the control unit and the high voltage isolation probe. The utility model provides an electric automobile is resistance measurement device a little on line, be one kind under the condition that does not influence electric automobile normal operating, to the device that high voltage power internal resistance of cell, supplementary internal resistance of cell, motor winding resistance, distribution cable connect, the little resistance of switch contact carries out real -time on -line monitoring, storage and transmits.
Description
Technical field
The utility model relates to a kind of electric automobile measurement mechanism, especially relates to the online microresistivity survey device of a kind of electric automobile.
Background technology
The accumulator of electric powered motor power-supply battery and accessory power supply is by voltage at present substantially, electric current, the external manifestation factors such as temperature are assessed, prediction, change by load, consistance, the factor impacts such as rate of ageing difference are difficult to the state of its inherence of accurate assurance, especially power battery pack keeps output to be difficult to use common surveying instrument to measure up to the voltage of hundreds of volt, and from the chemical characteristic of battery, its electromotive force because of material relationships basically identical, the aging increase mainly meaning internal resistance, in real time the dynamic internal resistance of cell of measuring can provide an important underlying parameter to the battery management system of electric automobile, electric motor car inner cable is in addition gathered, connector, switching node is a lot, comprise motor winding and all belong to micro-resistance category, substantially be visual in the past, lower electric multimeter is measured, the means such as line node temperature survey, be limited by measuring accuracy and mode, the restriction of the factor such as experience is difficult to the real-time slight change being presented at resistance under various operating mode intuitively, online micro-resistance detects the production to car load in real time, maintenance provides an important instrument, how the measurement of micro-resistance avoids environmental interference to be crucial.
Utility model content
The utility model provides the online microresistivity survey device of a kind of electric automobile, solve micro-balk ring road resistivity-measuring devices in the past and be not suitable for the micro-resistance loop measurement of high voltage, the problem of long real-time online record also cannot be provided, this device makes electric automobile work in high vibration, high temperature difference, the environment of high humility, many connectors, Multi-Switch part, to Key Circuit carry out real-time online measuring to searching burst, the circuit hidden danger of transient state is very helpful, its technical scheme is as described below:
The online microresistivity survey device of a kind of electric automobile, comprise the MCU signal transacting and control module that are connected with CAN, and high_voltage isolation probe, described MCU signal transacting and control module and high_voltage isolation are provided with PGA amplifying circuit, A/D convertor circuit and DSP digital phase-locked loop amplifying circuit between popping one's head in.
Signal pre-amplification circuit, filtering circuit is provided with between described high_voltage isolation probe and PGA amplifying circuit.
Described MCU signal transacting is also connected with display device by RS232C, RS485 interface with control module.
Described device is provided with and the memory storage be connected with control module with MCU signal transacting.
Described high_voltage isolation probe circuit is provided with the Wheatstone bridge of insertion, inserts for improving measuring accuracy.
The online microresistivity survey device of the electric automobile that the utility model provides, a kind of when not affecting electric automobile and normally running, to the device that the high voltage power internal resistance of cell, boosting battery internal resistance, motor winding resistance, distribution cable joint, the micro-resistance of switch contact carry out real time on-line monitoring, store and transmit.This system uses four lead-in wire high_voltage isolation probe circuits to inject the characteristic signal ripple (non-electrified body is improve measuring accuracy further to insert Wheatstone bridge) of modulation, survey object two ends produce feeble signal enter enlarge leadingly by filtering, enter PGA after filtering to amplify, the laggard line number tone of Chinese characters of AD conversion is managed filtering and is adopted the amplification of DSP digital phase-locked loop to carry out correlation demodulation and inhibits Noise and Interference greatly.For electric automobile research and development, trial-production, production, maintenance, maintenance provide the tool data of deep layer to support.
Accompanying drawing explanation
Fig. 1 is the hardware block diagram of the online microresistivity survey device of described electric automobile;
Fig. 2 is the operational flow diagram of the online microresistivity survey device of described electric automobile.
Embodiment
The electric automobile real-time online microresistivity survey device that the utility model provides, there are two kinds of mode of operations, high pressure line model can be connected to electrical source of power electric battery or the accessory power supply battery pack matching measurement in order to its internal resistance change of Real-Time Monitoring and cable joint, connector, switch contact, motor winding resistance when not affecting electric automobile normally runs, another kind ofly measure for strengthening in conjunction with the precision of Wheatstone bridge under the direct-connected pattern of power-off.
As shown in Figure 1, the online microresistivity survey device of described electric automobile, comprise the MCU signal transacting and control module that are connected with CAN, and high_voltage isolation probe, described MCU signal transacting and control module and high_voltage isolation are provided with PGA amplifying circuit, A/D convertor circuit and DSP digital phase-locked loop amplifying circuit between popping one's head in.
Signal pre-amplification circuit, filtering circuit is provided with between described high_voltage isolation probe and PGA amplifying circuit.
Described MCU signal transacting is also connected with display device by RS232C, RS485 interface with control module.
Described device is provided with and the memory storage be connected with control module with MCU signal transacting.
As shown in Figure 2, device bootloader, selects test mode to its workflow, then the outside DAC of MCU central control unit instruction produces the sinusoidal wave stairstep signal of 24 1KHZ, envelope 1KHZ sine wave signal is taken out through low-pass filtering, weak drive voltage amplitude signal is converted into probe proportional current drive singal, then injected by micrometer resistance circuit by probe after 1:1 isolation drive, the described feeble signal produced by micrometer resistance circuit is popped one's head in through analog isolation and is fetched, through bandpass filtering laggard enter fixed gain difference low noise enlarge leadingly, PGA pga circuit is entered by known gain by setup parameter, digital signal is converted into through inner 12 ADC of MCU, inject after digital filtering digital phase-locked loop amplify carry out correlation demodulation remove noise interferences (output of lock-in amplifier is a DC voltage, being proportional to is the signal amplitude of a certain characteristic frequency in input signal (parameters input frequency).And other frequency contents in input signal can not form any contribution to output voltage).
Inject the conversion of FFT Fourier series in addition and produce frequency spectrum compensation signal, according to setting value, different tested object is compensated, comprehensively carry out the clearing of resistance R value, after the multicycle is average, provides measurement result.
Wherein, reference power supply adopts the voltage source of 10PPM to ensure the temperature stability of DAC and ADC.
And temperature sensing circuit Main Function is for detecting metering circuit substrate temperature to be carried out the drift of compensation for calibrating errors sensitive circuit temperature by MCU, further, the records of values Main Function of three dimension acceleration sensor is the travel condition of vehicle judging that resistance is abnormal when changing.
In addition, EEPROM is setting parameter region, SRAM is data run district, NORFLASH is extender district, NANDFLASH is that mass data storage district is with non-volatile recording collection site data, RS232/RS485 serial port is mainly and other devices communicatings and parameter maintenance, and dual CAN bus Main Function is for reading vehicle-state or sending message notice vehicle information network, and DC/DC power supply Main Function is produce multichannel ultra-low noise element circuit power supply from vehicle accumulator 12/24V power conversion.
Claims (5)
1. the online microresistivity survey device of electric automobile, it is characterized in that: comprise the MCU signal transacting and control module that are connected with CAN, and high_voltage isolation probe, described MCU signal transacting and control module and high_voltage isolation are provided with PGA amplifying circuit, A/D convertor circuit and DSP digital phase-locked loop amplifying circuit between popping one's head in.
2. the online microresistivity survey device of electric automobile according to claim 1, is characterized in that: be provided with signal pre-amplification circuit, filtering circuit between described high_voltage isolation probe and PGA amplifying circuit.
3. the online microresistivity survey device of electric automobile according to claim 1, is characterized in that: described MCU signal transacting is also connected with display device by RS232C, RS485 interface with control module.
4. the online microresistivity survey device of electric automobile according to claim 1, is characterized in that: described device is provided with and the memory storage be connected with control module with MCU signal transacting.
5. the online microresistivity survey device of electric automobile according to claim 1, is characterized in that: described high_voltage isolation probe circuit is provided with the Wheatstone bridge of insertion, inserts for improving measuring accuracy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520481534.0U CN204903654U (en) | 2015-07-06 | 2015-07-06 | Electric automobile is resistance measurement device a little on line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520481534.0U CN204903654U (en) | 2015-07-06 | 2015-07-06 | Electric automobile is resistance measurement device a little on line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204903654U true CN204903654U (en) | 2015-12-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520481534.0U Expired - Fee Related CN204903654U (en) | 2015-07-06 | 2015-07-06 | Electric automobile is resistance measurement device a little on line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204903654U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111208411A (en) * | 2020-01-16 | 2020-05-29 | 冬烨(上海)机电科技有限公司 | Multi-channel low-resistance test system |
| CN111614133A (en) * | 2019-02-22 | 2020-09-01 | 欧若拉飞行科学公司 | Method for reconfiguring a battery system and reconfigurable battery system |
-
2015
- 2015-07-06 CN CN201520481534.0U patent/CN204903654U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111614133A (en) * | 2019-02-22 | 2020-09-01 | 欧若拉飞行科学公司 | Method for reconfiguring a battery system and reconfigurable battery system |
| CN111208411A (en) * | 2020-01-16 | 2020-05-29 | 冬烨(上海)机电科技有限公司 | Multi-channel low-resistance test system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151223 Termination date: 20160706 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |