CN104458288A - Combined test bed for electric power steering (EPS) system - Google Patents
Combined test bed for electric power steering (EPS) system Download PDFInfo
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- CN104458288A CN104458288A CN201410607092.XA CN201410607092A CN104458288A CN 104458288 A CN104458288 A CN 104458288A CN 201410607092 A CN201410607092 A CN 201410607092A CN 104458288 A CN104458288 A CN 104458288A
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Abstract
The invention discloses a combine test bed for an electric power steering (EPS) system. The combine test bed comprises a bed body, a power steering system installed above the bed body and a load simulator installed below the bed body, the power steering system comprises a steering wheel, a steering input shaft connected with the steering wheel and a steering output shaft connected with the steering input shaft, the steering input shaft is connected with a torque sensor, and the torque sensor detects the value of torque of the steering wheel, the load simulator comprises a gear and rack type direction machine connected with the steering output shaft, and the direction machine is driven by a brushless motor. According to the combine test bed, data transmission is conducted through a wireless communication module according to a Bluetooth wireless communication protocol, no transmission communication line is needed, and stability of EPS transmission signals is guaranteed; multiple vehicle types can be simulated on the same test bed; EPS is not limited by occasions, transmission signals are stable, and service life is long.
Description
Technical field
The present invention relates to automobile chassis performance test apparatus technical field, is especially a kind of electric boosting steering system Comprehensive Testing Facility.
Background technology
In recent years, along with popularizing of automobile, the consumption requirements of international energy increases day by day, urgently wish that new-energy automobile is to replace the automobile of existing high energy consumption both at home and abroad, and electric boosting steering system is as the vitals of new-energy automobile, more and more be subject to people's attention, its market share also increases day by day.Electric boosting steering system will through long-term test in beginning development, and wherein most important part during bench test, only have by bench test, just can carry out follow-up real train test.Electric power steering (Electric Power Steering, be called for short EPS) technology is the new technology in motor turning field in recent years, obtains significant progress abroad, and EPS is also the domestic study hotspot turning to industry at present.EPS is as the safety member of automobile, and its performance direct relation the safe reliability of running car, the manipulation portability of human pilot and sensitivity.Carrying out full test to the performance of each parts of this system is automobile electric booster steering system assembling, factory inspection and the important step of overhauling.Under the environment in laboratory, how to carry out the test of EPS performance and the evaluation of EPS control strategy, be the problem that researcher needs to consider emphatically.Rational load mode, simulated environment true to nature and real-time controlling of sampling are the key issues that EPS performance testing device needs to solve.
But design and the application aspect of existing electric booster system also have the following disadvantages: 1. same stand can not simulate various, because different vehicles exists the difference such as car weight, tyre width, its whole-car parameters differs greatly, cause the ground drag square difference suffered by it also large, existing test-bed is merely able to the situation simulating the single ground moment of resistance, same stand can not simulate the actual conditions of ground drag square suffered by different automobile types.2. use occasion is restricted, and existing EPS is wire transmission, and output signal is easily interfered.3. serviceable life is short, and transmission communication line is continuous aging breakage along with the increase of service time, thus causes output signal unstable or incorrect.4. transmission communication line is easily wound around and breaks, and transmission communication line is easy to, in use along with steering wheel rotation is wound around mutually, is easily pulled off or causes jitter while exporting the signal measured.
How to make EPS be suitable for the simulation test of different automobile types, realize the functional test to electric boosting steering system by wireless signal transmission, also can realize the durable test of electric boosting steering system is the problem needing solution badly simultaneously.
Summary of the invention
Be directed to above-mentioned deficiency, the object of the present invention is to provide a kind of electric boosting steering system Comprehensive Testing Facility, with solve transmission communication line in prior art to the interference of EPS signal transmission and same stand can not be simulated various and problem.
For achieving the above object, the invention provides a kind of electric boosting steering system Comprehensive Testing Facility, it comprises stand, the load simulator being arranged on the servo steering system above described stand and being arranged on below described stand, described servo steering system comprises bearing circle, connect described bearing circle turn to input post, connect described in turn to input shaft turn to output shaft, be connected with torque sensor described turning on input shaft, described torque sensor detects the torque value of described bearing circle; Described load simulator comprises the pinion and-rack steering wheel turning to output shaft described in connection, and described steering wheel is driven by brushless electric machine; It is characterized in that,
Described servo steering system also comprises:
First reducing gear, turns to input shaft described in described torque sensor is connected by described first reducing gear; Described first reducing gear is turned round for increasing of slowing down, and provides booster torquemoment to bearing circle;
Signal acquiring and processing circuit, its torque signal exported for gathering described torque sensor, and convert wireless signal to;
First wireless communication module, it is for launching described wireless signal;
Described load simulator also comprises:
Second reducing gear, its one end connects described brushless electric machine, and its other end connects described steering wheel;
Second controller, it connects described brushless electric machine, for receiving described wireless signal, driving treatment circuit through signals collecting and motor, driving described motor to make it operate;
Host computer, it is in order to send a signal to second controller by wireless transmission, controls second controller fictitious load, realizes the functional test of steering.
EPS adopts Bluetooth wireless communication agreement to carry out data transmission by wireless communication module, avoids the use of transmission communication line, ensure that the stability of EPS signal transmission; Changed by Electronic Control load, can under different automobile types, road conditions and vehicle speed condition, real time modelling goes out true ground moment of resistance size, achieves on same stand and simulates various; EPS is not limited, steady signal transmission by occasion, long service life.
Preferably, described Signal acquiring and processing circuit comprises:
First interface, it is mounted on the torque sensor on the steering column of described bearing circle, for receiving described external torque signal;
Second interface, its data cube computation first wireless communication module;
First capacity cell, one end ground connection, the other end connects described first interface, and it is for preventing static impedance;
First resistive element, one end ground connection, the other end connect described first capacity cell, its for external signal electric current through its to produce a voltage;
One RC filtering circuit, it is in parallel with described first resistive element, and comprise the second resistive element and second capacity cell of series connection, it is for filtering high-frequency interferencing signal;
One end of wherein said second resistive element connects described first resistance, and the other end is connected to described first wireless communication module by the 3rd resistive element; The other end of described second resistive element be also connected with two of series connection in the same way diode to ensure that the voltages being input to Logic judgment processor are no more than 3.3V, protect the first wireless communication module;
Described motor drives treatment circuit to comprise:
Power supply, it provides electric energy for motor;
Four switches, it is the direction of current changed by gauge tap folding in motor;
First and second electrode interface, it is mounted on described motor, for receiving described voltage signal;
Two one group, four switches are connected in parallel on two electrode interface two ends, and power supply is connected between one group of switch, another group switch indirectly.
Preferably, described servo steering system also comprises the first motor, and it connects described first reducing gear; First controller, the first motor described in its control linkage, and the signal receiving described host computer controls the running of described first motor.
Preferably, described host computer receives the described wireless signal that described first wireless communication module is launched, and with reference to storing and the different power-assisted curves in described host computer, realize different load values and by the torque signal of emit periodic to the first wireless communication module and second controller, realize the durable test of steering;
Described host computer can input vehicle speed signal, engine rotational speed signal in real time by radioing to the first controller and second controller, realizes the durable test of steering.
Preferably, the first described wireless communication module directly adopts Bluetooth wireless communication agreement to carry out data transmission.
Preferably, the first described wireless communication module can be communication antenna.
Preferably, described turns to output shaft universal-joint, and universal joint lower end is fixed on steering wheel; The second described reducing gear output terminal fixes spiral gear, and spiral gear is engaged in the tooth bar of steering wheel; Described steering wheel is provided with elastic component away from one end of the second reducing gear, and its effect prevents steering wheel stuck.
For achieving the above object, the present invention also provides a kind of detection method of electric boosting steering system, staff steering wheel rotation, described torque sensor detects torque value, and through Signal acquiring and processing circuit, being converted into wireless signal launches to described host computer by the first wireless communication module, described host computer Received signal strength, and is processed it by signal acquisition circuit;
Described host computer receives the described wireless signal that described first wireless communication module is launched, and with reference to storing and the different power-assisted curves in described host computer, realizes different load values.
Preferably, described host computer gives the first wireless communication module and second controller by the torque signal of emit periodic, realizes the durable test of steering.
The beneficial effect of the invention:
One, electric boosting steering system just just provides power-assisted by motor when turning to, and not consumed energy when not turning to, can reduce the fuel consume of vehicle.
Two, the power-assisted size that electric boosting steering system provides can be adjusted easily by software.When low speed, electric boosting steering system can provide larger power steering, provides the ease of steering of vehicle; Along with the raising of the speed of a motor vehicle, the power steering that electric boosting steering system provides can reduce gradually, and the steering force provided needed for driver when turning to will increase gradually, and such driver just experiences significantly " road feel ", improves intact stability.
Electric boosting steering system can also apply certain additional aligning torque or damping torque, when making low speed, steering wheel can get back to centre position accurately, and vibration and the overshoot of returning at a high speed steering wheel in positive process can be suppressed, take into account return performance during vehicle high, low speed.
Three, electric boosting steering system eliminates the parts such as fluid-link steering oil pump, oil cylinder, fluid pressure line, oil tank, and motor and reducing gear can make an entirety with steering column, steering gear, make whole steering system structural compact, quality is light, assembling is on a production line good, save installation time, be easy to maintaining.
Four, by the setting of program, electric boosting steering system easily mates with different automobile types, can shorten the cycle of producing and developing.
The present invention adopts Bluetooth wireless communication agreement to carry out data transmission by wireless communication module, avoids the use of transmission communication line, ensure that the stability of EPS signal transmission; By Electronic Control torque value, realize load change, can under different automobile types, road conditions and vehicle speed condition, real time modelling goes out true ground moment of resistance size, achieves on same stand and simulates various; EPS is not limited, steady signal transmission by occasion, long service life.
Accompanying drawing explanation
Fig. 1 illustrates the structural representation of electric boosting steering system Comprehensive Testing Facility of the present invention;
Fig. 2 illustrates the stereographic map of electric boosting steering system Comprehensive Testing Facility of the present invention;
Fig. 3 illustrates the steering wheel end construction schematic diagram of electric boosting steering system Comprehensive Testing Facility of the present invention;
Fig. 4 illustrates the Signal acquiring and processing circuit diagram in electric boosting steering system Comprehensive Testing Facility of the present invention;
The motor that Fig. 5 illustrates in electric boosting steering system Comprehensive Testing Facility of the present invention drives treatment circuit figure;
Fig. 6 illustrates the data-signal processing flow chart of electric boosting steering system Comprehensive Testing Facility of the present invention;
Fig. 7 illustrates the control flow chart of electric boosting steering system Comprehensive Testing Facility of the present invention.
Embodiment
For the ease of the understanding of those skilled in the art, below in conjunction with embodiment and accompanying drawing, the present invention is further illustrated, and the content that embodiment is mentioned not is limitation of the invention.
With reference to shown in Fig. 1 and 2, electric boosting steering system Comprehensive Testing Facility of the present invention, comprise stand 1, be provided with servo steering system 2 above described stand 1 and below is provided with load simulator 3, servo steering system 2 comprises bearing circle 21, steering column 22, intermediate shaft 23, first motor 24, torque sensor 25, first reducing gear 26, first controller 27, load simulator 3 comprises the second motor 31, second reducing gear 32, second controller 33, steering wheel 34, two gim pegs 36 are provided with in the middle part of steering wheel 34, and be fixed on below stand 1 by gim peg 36, stage clip 35 fixed by the tooth bar of steering wheel 34 one end, stage clip 35 is fixed on below stand 1 by limited block 37, the tooth bar of steering wheel 34 other end is by spiral gear and the second reducing gear 32 engaged transmission, second reducing gear 32 is fixedly mounted on below stand 1, friend's four pulleys 38 are given up well in stand 1 bottom surface, be convenient to mobile and transport, host computer data cube computation is used for servo steering system 2 and load simulator 3, host computer can input to controller rate signal and engine rotational speed signal.
Wherein, the torque signal of bearing circle 21 sends signal by bluetooth, can give multiple receiving end transmitting energy, information; This application, for a receiving end, comprises transmitter module and a receiver module; This torch measuring system mainly comprises following components: input shaft, output shaft, torsion bar, the torque sensor of exportable digital signal, interface circuit crystal oscillator, I/O interface, MCU, SPI, bluetooth, antenna etc.
When applying, staff steering wheel rotation 21, now torque sensor 25 detects torque value, and through processing of circuit, be converted into Bluetooth signal and launch controller 33 to the first controller 27 and second, first controller 27 primary responsibility controls servo steering system 2, and realizes assist function according to the torque signal recorded; Controller 33 primary responsibility of second, according to the torque signal recorded, realizes load value output, thus can simulate real ground drag square; Now, servo steering system 2, according to the torque value of staff steering wheel rotation 21, exports booster torquemoment by the first motor 24, turns round, thus realize power-assisted through the increasing of slowing down of the first reducing gear 26; Meanwhile, load simulator 3, according to the torque value of staff steering wheel rotation, by the second motor 31 oppositely output torque, turns round through the increasing of slowing down of the second reducing gear 32, thus realizes output load; The size of load, can according to different vehicles, measure real ground drag square size, input in the controller 33 of second by host computer with the form of power-assisted curve, in test process, also need controller 33 vehicle speed signal being inputed to the first controller 27 and second by host computer in real time, engine rotational speed signal, true environment when so just can simulate automobilism completely really and power-assisted situation.
In addition, this testboard bay also can do durable test as durability test desk to electric boosting steering system, primarily of host computer send periodic torque signal to the first controller 27 and second controller 33, do not need staff to carry out steering wheel rotation 21 like this, just can realize the periodic running of servo steering system 2.
With reference to shown in Fig. 3, vertical fixing circular push-pads 39 side on the tooth bar of steering wheel 34 one end, push-pads 39 opposite side fixes stage clip 35 one end, the area of push-pads 39 is greater than stage clip 35, stage clip 35 other end is fixed on limited block 37, limited block 37 is established in " L " type card and is fixed on stage clip 35 end, reinforcement 40 is fixed on limited block 37 both sides in " L " type, utilize triangle stability principle, improve the stability of entirety of limited block 37, the tooth bar of steering wheel 34, stage clip 35 and limited block 37 are located on the same line.
With reference to shown in Fig. 4, Signal acquiring and processing circuit comprises:
TQ1, it is mounted on the torque sensor on the steering column of bearing circle, for receiving described external torque signal;
TQ1_AI, its data cube computation first wireless communication module;
C54, one end ground connection, the other end connects TQ1, and it is for preventing static impedance;
R78, one end ground connection, the other end connect C54, its for external signal electric current through its to produce a voltage;
One RC filtering circuit, it is in parallel with R78, comprises R79 and C55 of series connection, and it is for filtering high frequency interference number;
Wherein one end of R79 connects R78, and the other end is connected to TQ1_AI by R80; The other end of R79 be also connected with two of series connection in the same way diode to ensure that the voltages being input to the first wireless communication module are no more than 3.3V, protect the first wireless communication module; C54 capacitor value is 1nF, R78 resistance be 200K Ω, R79 resistance be 22K Ω, C55 capacitor value is 0.01 μ F, and R80 resistance is 1K Ω.
As shown in Figure 5, motor drives treatment circuit to comprise:
12V is power supply, and it provides electric energy for motor M;
Mosfet a, b, c, d, it is the direction of current changed by pilot relay folding in motor M;
M+, M-, it is mounted on described motor, for receiving described voltage signal;
Mosfet a, b, c, d two one group is connected in parallel on M+, M-two ends, and 12V is that power supply is connected between one group of Mosfet, another group Mosfet indirectly.
With reference to shown in Fig. 6 and 7, torque sensor detects torque value, and produce corresponding steering order through the first controller acquisition process, control the first reducing gear and produce corresponding booster torquemoment, torque sensor will detect torque value by antenna transmission to the 3rd wireless communication module simultaneously, computing machine receives torque signal and produces corresponding steering order and be transferred to second controller by the second wireless communication module, second controller carries out acquisition process to signal and produces corresponding steering order, controls the second reducing gear and produces corresponding reactive torque;
Different power-assisted curves is had in computing machine, computing machine is transmitted to the first controller and second controller by the 3rd wireless communication module, first controller and second controller are by the first wireless communication module and the second wireless communication module Received signal strength, and acquisition process is carried out to signal produce corresponding steering order, the first controller controls the first reducing gear and produces corresponding booster torquemoment and second controller and control the second reducing gear and produce corresponding reactive torque;
Can realize, according to power-assisted curves different in computing machine, realizing different load values; Computing machine is used for inputing to controller rate signal and engine rotational speed signal, true environment when so just can simulate automobilism completely really and power-assisted situation, not only can realize the functional test to electric boosting steering system, also can realize the durable test to electric boosting steering system.
Simple envelope detected circuit is added at demodulating end, AM modulation technique: AM (Amplitude Modulation) refers to that signal amplitude is modulated, in the analog-modulated of continuous wave, the simplest form makes the amplitude of single-frequency cosine wave (CW) at mean value place with modulation signal linear change, or export modulated signal and input modulating signal m (t) linearly corresponding relation, be called traditional modulation, be designated as AM.
All need to send and reception information at power supply transmission interface end and receiving interface end, power supply transmission interface end need send energy, and receiving interface end needs received energy, and this there are certain requirements the antenna sent, receive, and needs suitable antenna matching, realizes resonance coupling.
This testboard bay also can do durable test as durability test desk to electric boosting steering system, periodic torque signal is sent to the first controller and second controller by the process computer monitored, do not need staff to carry out steering wheel rotation like this, just can realize the periodic running of electric boosting steering system.
Embody rule approach of the present invention is a lot, and the above is only the preferred embodiment of the present invention, should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvement, these improvement also should be considered as protection scope of the present invention.
Claims (9)
1. an electric boosting steering system Comprehensive Testing Facility, it comprises stand, the load simulator being arranged on the servo steering system above described stand and being arranged on below described stand, described servo steering system comprises bearing circle, connect described bearing circle turn to input post, connect described in turn to input shaft turn to output shaft, be connected with torque sensor described turning on input shaft, described torque sensor detects the torque value of described bearing circle; Described load simulator comprises the pinion and-rack steering wheel turning to output shaft described in connection, and described steering wheel is driven by brushless electric machine; It is characterized in that,
Described servo steering system also comprises:
First reducing gear, turns to input shaft described in described torque sensor is connected by described first reducing gear; Described first reducing gear is turned round for increasing of slowing down, and provides booster torquemoment to bearing circle;
Signal acquiring and processing circuit, its torque signal exported for gathering described torque sensor, and convert wireless signal to;
First wireless communication module, it is for launching described wireless signal;
Described load simulator also comprises:
Second reducing gear, its one end connects described brushless electric machine, and its other end connects described steering wheel;
Second controller, it connects described brushless electric machine, for receiving described wireless signal, driving treatment circuit through signals collecting and motor, driving described motor to make it operate;
Host computer, it is in order to send a signal to second controller by wireless transmission, controls second controller fictitious load, realizes the functional test of steering.
2. electric boosting steering system Comprehensive Testing Facility according to claim 1, is characterized in that: described Signal acquiring and processing circuit comprises:
First interface, it is mounted on the torque sensor on the steering column of described bearing circle, for receiving described external torque signal;
Second interface, its data cube computation first wireless communication module;
First capacity cell, one end ground connection, the other end connects described first interface, and it is for preventing static impedance;
First resistive element, one end ground connection, the other end connect described first capacity cell, its for external signal electric current through its to produce a voltage;
One RC filtering circuit, it is in parallel with described first resistive element, and comprise the second resistive element and second capacity cell of series connection, it is for filtering high-frequency interferencing signal;
One end of wherein said second resistive element connects described first resistance, and the other end is connected to described first wireless communication module by the 3rd resistive element; The other end of described second resistive element be also connected with two of series connection in the same way diode to ensure that the voltages being input to Logic judgment processor are no more than 3.3V, protect the first wireless communication module;
Described motor drives treatment circuit to comprise:
Power supply, it provides electric energy for motor;
Four switches, it is the direction of current changed by gauge tap folding in motor;
First and second electrode interface, it is mounted on described motor, for receiving described voltage signal;
Two one group, four switches are connected in parallel on two electrode interface two ends, and power supply is connected between one group of switch, another group switch indirectly.
3. electric boosting steering system Comprehensive Testing Facility according to claim 1, is characterized in that: described servo steering system also comprises the first motor, and it connects described first reducing gear; First controller, the first motor described in its control linkage, and the signal receiving described host computer controls the running of described first motor.
4. electric boosting steering system Comprehensive Testing Facility according to claim 1, it is characterized in that: described host computer receives the described wireless signal that described first wireless communication module is launched, and with reference to storing and the different power-assisted curves in described host computer, realize different load values and by the torque signal of emit periodic to the first wireless communication module and second controller, realize the durable test of steering;
Described host computer can input vehicle speed signal, engine rotational speed signal in real time by radioing to the first controller and second controller, realizes the durable test of steering.
5. electric boosting steering system Comprehensive Testing Facility according to claim 1, is characterized in that: the first described wireless communication module directly adopts Bluetooth wireless communication agreement to carry out data transmission.
6. electric boosting steering system Comprehensive Testing Facility according to claim 1, is characterized in that: the first described wireless communication module can be communication antenna.
7. electric boosting steering system Comprehensive Testing Facility according to claim 1, is characterized in that: described turns to output shaft universal-joint, and universal joint lower end is fixed on steering wheel; The second described reducing gear output terminal fixes spiral gear, and spiral gear is engaged in the tooth bar of steering wheel; Described steering wheel is provided with elastic component away from one end of the second reducing gear, and its effect prevents steering wheel stuck.
8. one kind utilizes the detection method of the electric boosting steering system of the electric boosting steering system Comprehensive Testing Facility described in claim 1, it is characterized in that: staff steering wheel rotation, described torque sensor detects torque value, and through Signal acquiring and processing circuit, being converted into wireless signal launches to described host computer by the first wireless communication module, described host computer Received signal strength, and by signal acquisition circuit, it is processed;
Described host computer receives the described wireless signal that described first wireless communication module is launched, and with reference to storing and the different power-assisted curves in described host computer, realizes different load values.
9. the detection method utilizing the electric boosting steering system of electric boosting steering system Comprehensive Testing Facility according to claim 8, it is characterized in that: described host computer passes through the torque signal of emit periodic to the first wireless communication module and second controller, realizes the durable test of steering.
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| CN201410607092.XA CN104458288A (en) | 2014-10-31 | 2014-10-31 | Combined test bed for electric power steering (EPS) system |
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| CN107402138A (en) * | 2017-06-26 | 2017-11-28 | 吉利汽车研究院（宁波）有限公司 | The test system and method for electric power-assisted steering apparatus |
| CN108020433A (en) * | 2017-12-19 | 2018-05-11 | 浙江工业大学 | Utilize the method for electric boosting steering system test platform simulation test performance |
| CN110186698A (en) * | 2019-06-02 | 2019-08-30 | 深圳市中智仿真科技有限公司 | A kind of automobile simulator steering mechanism |
| CN110319967A (en) * | 2019-07-11 | 2019-10-11 | 吉林瑞铭机电设备有限公司 | A kind of EPS handle power automatic detecting machine |
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| CN108020433B (en) * | 2017-12-19 | 2020-01-31 | 浙江工业大学 | Method for simulating test performance by using electric power steering system test platform |
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