CN103162971B - Electric motor car driving process wireless test system - Google Patents

Electric motor car driving process wireless test system Download PDF

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CN103162971B
CN103162971B CN201310104668.6A CN201310104668A CN103162971B CN 103162971 B CN103162971 B CN 103162971B CN 201310104668 A CN201310104668 A CN 201310104668A CN 103162971 B CN103162971 B CN 103162971B
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data
electric motor
signal
motor car
driving process
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CN103162971A (en
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周黔
薛荣生
郝允志
林毓培
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Southwest University
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Southwest University
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Abstract

Electric motor car driving process wireless test system, relates to a kind of electronic performance detecting instrument, includes sensor group, be arranged in electric motor car to be measured, gather the raw data in electric motor car driving process to be measured; Wireless communication unit, original data transmissions sensor group collected is to signals collecting mechanism; Signals collecting mechanism, for the raw data that receiving sensor group collects, carries out data processing to raw data, and stores the data after process and show; Signal Analysis System, the data that Received signal strength collecting mechanism sends, and analyzing and processing is carried out to data, output test result.It can data in centering Large Electric car driving process, carry out data interaction, and unify to gather, analyze and record to data, export the various test results in electric motor car driving process, be convenient to test run person and observe by wireless communication unit.

Description

Electric motor car driving process wireless test system
Technical field
The present invention relates to a kind of electronic performance detecting instrument, particularly a kind of detecting and analysing system for medium-and-large-sized electric motor car driving process such as electrocar, motor wagon, electric motor coaches.
Background technology
For the test of electric automobile during traveling process, when the not opening of communication bus agreement, or when the signal provided in communication bus can not meet the demands, the renewal frequency of such as signal is low, or the lazy weight of signal, for test analysis is made troubles.For medium-and-large-sized electric motor car, vehicle body is comparatively large, and all the sensors, at the different parts of vehicle, be connected on measuring and analysing meter by each sensor location, connects up more difficult.In addition, in experimental study process, need often to adjust each parts and signal wire, very inconvenient, and easily cause fault.
Also there is the problem of some technological rationalities in the electric motor car driving process test macro of current existence: the instrument that (1) has does not have writing function, even if there is writing function, but the data acquisition of each instrument is asynchronous, for performance evaluation brings error.(2) for vehicle performance analysis, require that signals collecting has higher real-time and sample frequency, it is more difficult that each instrument of having bought be made all to possess this function.(3) because sensor and corresponding instrument are distributed in the different parts of vehicle, test run person is not easy to observe simultaneously.(4) because each instrument is not for electric motor car design, independent mutually, can not collaborative work, intuitively can not reflect the transport condition of vehicle, such as speed ratio calculating, gradient calculating, power efficiency analysis etc.These problems are that the performance evaluation of electric automobile during traveling process brings difficulty.
Summary of the invention
Object of the present invention is just to provide a kind of electric motor car driving process wireless test system, it can data in centering Large Electric car driving process, data interaction is carried out by wireless communication unit, and unify to gather, analyze and record to data, export the various test results in electric motor car driving process, be convenient to test run person and observe.
The object of the invention is by such technical scheme realize, it includes sensor group, wireless communication unit, signals collecting mechanism and Signal Analysis System;
Sensor group, is arranged in electric motor car to be measured, gathers the raw data in electric motor car driving process to be measured;
Wireless communication unit, original data transmissions sensor group collected is to signals collecting mechanism;
Signals collecting mechanism, for the raw data that receiving sensor group collects, carries out data processing to raw data, and stores the data after process and show;
Signal Analysis System, the data that Received signal strength collecting mechanism sends, and analyzing and processing is carried out to data, output test result.
Further, described signals collecting mechanism includes signals collecting initialization module, and signals collecting initialization module is used for arranging collecting sensor signal passage, frequency acquisition, stored parameter and vehicle parameter; Vehicle parameter includes vehicle wheel roll radius, motor umber of pulse, wheel umber of pulse weekly weekly.
Further, described sensor group includes voltage sensor, current sensor, motor speed sensor, wheel speed sensor, environment temperature sensor, measuring point temperature sensor, equivalent acceleration transducer and driver behavior signal transducer; Driver behavior signal transducer includes accelerator pedal signal transducer, brake signal sensor and shift signal sensor.
Further, described Signal Analysis System includes the real-time computing module of road grade, and its gradient computing formula is:
θ = arcsin ( a e - a g )
Wherein: θ is the angle of gradient, a efor equivalent acceleration, i.e. acceleration transducer output valve, a is vehicle acceleration, and g is acceleration of gravity.
Further, described Signal Analysis System includes transmission state monitoring modular, for monitoring in gearshift procedure, motor speed and the continuous Rapid Variable Design of transmission gear ratio, ratio of gear is calculated according to motor speed and vehicle wheel rotational speed, according to speed ratio change and the monitoring of motor operating point transmission performance, duty and failure message, calculate abrasion condition and ride comfort, motor operating point includes current signal and tach signal.
Further, described Signal Analysis System includes driving analysis module, and according to accelerator pedal signal, brake signal and shift signal in driving procedure, analytical calculation driving habits is on the impact of vehicle mileages of continuation.
Further, described Signal Analysis System includes environment temperature and measuring point temperature test module, and for specific road conditions, environmentally temperature and measuring point temperature, carry out temperature rise model analysis.
Further, described Signal Analysis System includes discharge capacity of the cell analysis module, calculates the actual discharge capacity of battery, analyze the actual usability of battery according to the change curve of electric current and voltage.
Further, described Signal Analysis System includes driving cycle analysis module, for the analytical calculation power of battery, motor operating point and electric efficiency, and utilizes vehicle equation formula, estimation present road situation.
Owing to have employed technique scheme, the present invention has following advantage:
The present invention can unify the various data that receiving sensor gathers, and record the various raw data collected, the raw data collected is sent to Signal Analysis System by wireless communication module.For medium-and-large-sized electric motor car, the invention solves because vehicle body is comparatively large, each sensor location, at the diverse location of vehicle, is difficult to the problem connected up.The present invention by arranging drainage pattern, can also uniform data gather passage, frequency and data layout, make the data that collect can data syn-chronization, be convenient to data analysis work.Signal Analysis System, to the data analysis process collected, direct output electric motor car test result, be convenient to test run person observe, the analytic function of Signal Analysis System is powerful, can meet all test requests of electric motor car test, as required, can also edit test function, increase or deletion test module, extendability is strong.
Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, or can be instructed from the practice of the present invention.Target of the present invention and other advantages can be realized by instructions below and claims and be obtained.
Accompanying drawing explanation
Accompanying drawing of the present invention is described as follows.
Fig. 1 is structural representation of the present invention;
Fig. 2 is test flow chart of the present invention;
Fig. 3 is the structural representation of a kind of embodiment of signals collecting mechanism;
Fig. 4 is the circuit diagram of the power supply of a kind of embodiment of signals collecting mechanism;
Fig. 5 is the circuit diagram of the processor of a kind of embodiment of signals collecting mechanism;
Fig. 6 is the circuit diagram of the wireless communication interface of a kind of embodiment of signals collecting mechanism;
Fig. 7 is the circuit diagram of the storer of a kind of embodiment of signals collecting mechanism.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Electric motor car driving process wireless test system, as shown in Figure 1, includes sensor group, wireless communication unit, signals collecting mechanism and Signal Analysis System;
Sensor group, is arranged in electric motor car to be measured, gathers the raw data in electric motor car driving process to be measured.
Wireless communication unit, original data transmissions sensor group collected is to signals collecting mechanism.Wireless communication unit can comprise a signal receiver be connected with signals collecting mechanism multiple wireless launcher be connected with sensor.Data are sent to wireless receiver by a wireless launcher by one or more sensor, then are sent to signal gathering unit, solve the wiring problem of sensing data transmission line.
Signals collecting mechanism, for the raw data that receiving sensor group collects, carries out data processing to raw data, and stores the data after process and show.
Signal Analysis System, the data that Received signal strength collecting mechanism sends, and analyzing and processing is carried out to data, output test result.Signal Analysis System can be independent host computer, and host computer and signals collecting mechanism carry out data transmission, also can be integrated in signals collecting mechanism.
Described signals collecting mechanism includes signals collecting initialization module, and signals collecting initialization module is used for arranging collecting sensor signal passage, frequency acquisition, stored parameter and vehicle parameter; Vehicle parameter includes vehicle wheel roll radius, motor umber of pulse, wheel umber of pulse weekly weekly.
Described sensor group includes voltage sensor, current sensor, motor speed sensor, wheel speed sensor, environment temperature sensor, measuring point temperature sensor, equivalent acceleration transducer and driver behavior signal transducer; Driver behavior signal transducer includes accelerator pedal signal transducer, brake signal sensor and shift signal sensor.
Obliquity sensor common on market and acceleration transducer, it is in fact equivalent acceleration transducer, its output signal is the superposition of vehicle acceleration and road grade, can not be directly used in the road grade in measuring vehicle driving process, can only static and at the uniform velocity take measurement of an angle under state.The present invention measures equivalent acceleration transducer signals and wheel rotation speed signals simultaneously, and the real-time computing module of road grade calculates vehicle acceleration according to the rate of change of vehicle wheel rotational speed, the signal of equivalent acceleration transducer is deducted the factor of vehicle acceleration.Can calculate road grade, its gradient computing formula is:
θ = arcsin ( a e - a g )
Wherein: θ is the angle of gradient, a efor equivalent acceleration, i.e. acceleration transducer output valve, a is vehicle acceleration, and g is acceleration of gravity.
Transmission state monitoring modular, for monitoring in gearshift procedure, motor speed and the continuous Rapid Variable Design of transmission gear ratio, ratio of gear is calculated according to motor speed and vehicle wheel rotational speed, according to speed ratio change and the monitoring of motor operating point transmission performance, duty and failure message, calculate abrasion condition and ride comfort, motor operating point includes current signal and tach signal.
The test and comparison of the mileages of continuation of current electric motor car single charge is extensive, is travelled in particular link by driver, when battery undervoltage, and record mileages of continuation.Because the factor such as number of times of operating habit, speed of operation and braking has material impact to mileages of continuation, driving analysis module of the present invention, can according to accelerator pedal signal, brake signal and the shift signal in driving procedure, analytical calculation driving habits is on the impact of vehicle mileages of continuation.
Standard mileages of continuation is tested:
Select good road, based on straight road; After vehicle launch, accelerator pedal remains on fixed position as far as possible, and such as, the position of corresponding level road 25km/h, travels with stabilizing speed; Need to adopt the mode slided in advance when slowing down, do not brake as far as possible; Stopping after battery undervoltage, calculating the mileages of continuation from starting to parking, be called standard mileages of continuation.
Mileages of continuation test under complex road condition:
Driver travels under the various road conditions of specifying, record driving process.
Such as, under the complex road condition of urban district, greatly, traffic lights are many, and driver needs frequent starting and brake for the stream of people and vehicle flowrate, can start brake or the impact of parking on mileages of continuation each time by simple method of estimation according to following formula.
ΔS = S r - S c n st
Wherein: △ S is average each startup brake or the mileages of continuation reduced that stops, S rfor standard mileages of continuation, S cfor the mileages of continuation of urban district complex road condition, n stfor the number of times starting brake or stop.
Such as, the category of roads of suburb country is lower, stone road or dirt road more, pavement roughness, road resistance to rolling is large, and the speed of a motor vehicle is not high, and therefore the proportion of windage is lower, although the accelerator pedal of driver constantly changes, braking conditions is less.Can estimate the impact of bad road surface on mileages of continuation according to following formula, the main energy considering road resistance and speed of a motor vehicle change consumption, ignore the impact of windage, therefore the impact of bad road surface on distance travelled is taked number percent to represent,
Δϵ = S r - S u S r · 100 %
Wherein: the ratio of the mileages of continuation that △ ε reduces on bad road surface for traveling, S rfor standard mileages of continuation, S ufor the mileages of continuation under poor road.
Such as, gear has material impact to mileages of continuation, and what current electric automobile had is configured with mechanical transmission, is usually provided with 2-3 gear, and the speed of a motor vehicle of each gear is different.For the Minitype electric automobile with 2 gears common at present, 1 keep off a car speed minimum, usual max. speed is 20-25km/h, 2 gear max. speed is about 45-60km/h.The speed of a motor vehicle is higher, and mileages of continuation is shorter.Gear is separately fixed at different gear, and test mileages of continuation, can investigate the concrete impact of gear on mileages of continuation.
Environment temperature and measuring point temperature test module, for specific road conditions, environmentally temperature and measuring point temperature, carry out temperature rise model analysis.Specific road conditions are the specific road conditions such as level road, ramp, frequent starting.
Discharge capacity of the cell analysis module, calculates the actual discharge capacity of battery, analyzes the actual usability of battery according to the change curve of electric current and voltage.
Driving cycle analysis module, for the analytical calculation power of battery, motor operating point and electric efficiency, and utilizes vehicle equation formula, estimation present road situation.
Determine the duty of each parts according to the signal of test and derive road condition, process is as follows:
Calculate the power of battery:
P bat＝U batI bat
Wherein: P batfor the power of battery, U batfor cell voltage, I batfor battery current.
Determine motor operating point:
According to battery current, i.e. the working current of motor and motor speed n m, look into machine operation performance plot determination motor operating point, obtain Motor torque T mwith electric efficiency η m.
Calculate the speed of a motor vehicle, vehicle acceleration, the gradient, vehicle drive force:
u a＝0.3768n rr
a = du a dt ≈ u a ( t + Δt ) - u a ( t ) Δt
θ = arcsin ( a e - a g )
F r = T m iη r
Wherein: u afor the speed of a motor vehicle, n rfor vehicle wheel rotational speed, vehicle wheel rotational speed n rwith motor speed n mproportional, scale-up factor is determined by the speed ratio i of the variator of vehicle, and η is transmission efficiency, and r is vehicle wheel roll radius, and t is the time, and △ t is the speed data collection time interval, F rfor vehicle drive force.
Analyze vehicle equation formula:
F r = fmg cos θ + C d A u a 2 21.15 + mg sin θ + ma
Wherein: F rfor vehicle drive force, f is rolling resistance coefficient, and m is complete vehicle weight, comprises driver weight, C dfor air resistance coefficient, A is front face area.
In this formula, complete vehicle weight m can measure and obtain; Air resistance coefficient C d, front face area A determines by vehicle; Only have rolling resistance coefficient unknown, this formula therefore can be utilized to calculate rolling resistance coefficient.
For the vehicle had, do not provide air resistance coefficient C d, then can carry out test in straight good road surface and obtain air resistance coefficient C d, method is as follows:
1) rolling resistance coefficient is tested
Select straight good road surface, vehicle is in low-speed stable running status, and vehicle-speed limit, at below 5km/h, ignores windage, and equation formula is reduced to
F r＝fmg
Utilize this formula can calculate rolling resistance coefficient f.
2) air resistance coefficient is calculated
At level road high-speed stable running, equation formula is reduced to
F r = fmg + C d A u a 2 21.15
This formula is utilized to calculate air resistance coefficient.
As shown in Figure 2, concrete steps are testing process of the present invention:
1) signals collecting mechanism is connected with sensor group;
2) initializing signal collecting mechanism;
3) enabling signal collecting mechanism, carries out data acquisition;
4) data that collect of Signal Analysis System analytic signal collecting mechanism, output test result.
Signal Analysis System can be arranged on the host computer of a platform independent, this host computer can be selected to be connected with signals collecting mechanism in test process, while signals collecting, signal is analyzed, also can select to be connected with signals collecting mechanism after test terminates, disposable analysis is carried out to gathered all signals.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of the technical program, it all should be encompassed in the middle of right of the present invention.

Claims (7)

1. electric motor car driving process wireless test system, is characterized in that: described test macro includes sensor group, wireless communication unit, signals collecting mechanism and Signal Analysis System;
Sensor group, is arranged in electric motor car to be measured, gathers the raw data in electric motor car driving process to be measured;
Wireless communication unit, original data transmissions sensor group collected is to signals collecting mechanism;
Signals collecting mechanism, for the raw data that receiving sensor group collects, carries out data processing to raw data, and stores the data after process and show;
Signal Analysis System, the data that Received signal strength collecting mechanism sends, and analyzing and processing is carried out to data, output test result;
Described signals collecting mechanism includes signals collecting initialization module, and signals collecting initialization module is used for arranging collecting sensor signal passage, frequency acquisition, stored parameter and vehicle parameter; Vehicle parameter includes vehicle wheel roll radius, motor umber of pulse, wheel umber of pulse weekly weekly;
Described sensor group includes voltage sensor, current sensor, motor speed sensor, wheel speed sensor, environment temperature sensor, measuring point temperature sensor, equivalent acceleration transducer and driver behavior signal transducer; Driver behavior signal transducer includes accelerator pedal signal transducer, brake signal sensor and shift signal sensor.
2. electric motor car driving process wireless test system as claimed in claim 1, it is characterized in that: described Signal Analysis System includes the real-time computing module of road grade, its gradient computing formula is:
θ = arcsin ( a e - a g )
Wherein: θ is the angle of gradient, a efor equivalent acceleration, i.e. acceleration transducer output valve, a is vehicle acceleration, and g is acceleration of gravity.
3. electric motor car driving process wireless test system as claimed in claim 1, it is characterized in that: described Signal Analysis System includes transmission state monitoring modular, for monitoring in gearshift procedure, motor speed and the continuous Rapid Variable Design of transmission gear ratio, ratio of gear is calculated according to motor speed and vehicle wheel rotational speed, according to speed ratio change and the monitoring of motor operating point transmission performance, duty and failure message, calculate abrasion condition and ride comfort, motor operating point includes current signal and tach signal.
4. electric motor car driving process wireless test system as claimed in claim 1, it is characterized in that: described Signal Analysis System includes driving analysis module, according to accelerator pedal signal, brake signal and shift signal in driving procedure, analytical calculation driving habits is on the impact of vehicle mileages of continuation.
5. electric motor car driving process wireless test system as claimed in claim 1, it is characterized in that: described Signal Analysis System includes environment temperature and measuring point temperature test module, for specific road conditions, environmentally temperature and measuring point temperature, carry out temperature rise model analysis.
6. electric motor car driving process wireless test system as claimed in claim 1, it is characterized in that: described Signal Analysis System includes discharge capacity of the cell analysis module, calculate the actual discharge capacity of battery according to the change curve of electric current and voltage, analyze the actual usability of battery.
7. electric motor car driving process wireless test system as claimed in claim 1, it is characterized in that: described Signal Analysis System includes driving cycle analysis module, for the analytical calculation power of battery, motor operating point and electric efficiency, and utilize vehicle equation formula, estimation present road situation.
CN201310104668.6A 2013-03-28 2013-03-28 Electric motor car driving process wireless test system Expired - Fee Related CN103162971B (en)

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CN106441929A (en) * 2016-09-05 2017-02-22 北京理工大学 Electromobile electric accessory performance testing and collecting system and collecting method
CN107608270A (en) * 2017-09-30 2018-01-19 北京奇虎科技有限公司 The analysis method and device of automotive performance
CN108871424A (en) * 2018-05-02 2018-11-23 西南大学 Driving device for electric vehicle environmental suitability test macro and its data processing method
CN109326014A (en) * 2018-12-05 2019-02-12 天津炜衡科技有限公司 A kind of electric vehicle road test system and method
CN109747433A (en) * 2018-12-29 2019-05-14 中国第一汽车股份有限公司 A kind of electric car P gear control method
MX2022002892A (en) * 2019-09-12 2022-04-06 Valmont Industries System and method for analysis of current and voltage levels within a center pivot irrigation system.

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