CN203216450U - Rotation-angle information acquisition system for steering wheel - Google Patents
Rotation-angle information acquisition system for steering wheel Download PDFInfo
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- CN203216450U CN203216450U CN 201320108186 CN201320108186U CN203216450U CN 203216450 U CN203216450 U CN 203216450U CN 201320108186 CN201320108186 CN 201320108186 CN 201320108186 U CN201320108186 U CN 201320108186U CN 203216450 U CN203216450 U CN 203216450U
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Abstract
The utility model discloses a rotation-angle information acquisition system for a steering wheel, which is used for calculating degree and direction of a rotation angle of the steering wheel, and comprises a signal generation device, a phase demodulation unit and a rotation-angle information processing unit. The signal generation device comprises two pulse signal generators which detect rotation of the steering wheel to generate two paths of pulse signals, and send the pulse signals to the phase modulation unit, wherein the two paths of pulse signals are the same in frequency but different in phase, and the phase of one path of pulse signals is ahead of that of the other path of pulse signals; the phase demodulation unit is connected with the signal generation device, receives the pulse signals, and according to phase sequence of pulse frequency of the two paths of pulse signals, obtains two paths of phase-demodulation signals; and the rotation-angle information processing is connected with the phase demodulation unit, can receive the two paths of phase-demodulation signals output by the phase demodulation unit, determines the direction of the rotation angle according to whether the two paths of phase-demodulation signals are alternate pulse or dc signals, and determines the degree of the rotation angle according to the quantity of pulses of the phase-demodulation signals.
Description
Technical field
The utility model relates to electronic measuring technology field, particularly a kind of steering wheel angle information acquisition system.
Background technology
Along with the development of car industry, traffic safety problem also becomes and paid close attention to by people.Driver's self security for the safe operation problem of studying the driver and when considering test, the more general method of current use be with driving simulator as research platform, utilize various sensors to gather the various characterization parameters of driver's driving behavior.
Driver's driver behavior behavior mainly is the operation to bearing circle, accelerator pedal, brake pedal and clutch coupling.In order to study the driver to the operation behavior of bearing circle, adopt parameters such as steering wheel angle size, corner direction, tarnsition velocity to reflect that the driver is to the operation behavior of bearing circle usually.
In driving simulator specialty fields of measurement, have high-precision rotary angle transmitter to gather corner information at present, the data of its collection can reach very high precision, but price is very high, has increased cost of development, is unfavorable for widespread use.And the acquisition precision of the comparatively cheap rotary angle transmitter of price is lower.Therefore, use rotary angle transmitter, be difficult to satisfy simultaneously the needs of cost and performance.
Summary of the invention
The utility model provides a kind of steering wheel angle information acquisition system, to reach the effect that the lower cost of use obtains higher measurement sensitivity.
The utility model discloses a kind of steering wheel angle information acquisition system, this system is used for corner size and the corner direction of calculated direction dish, and this system comprises signal generation apparatus, phase demodulation unit and corner information processing unit.
This signal generation apparatus, comprise two pulse signal generators, for detection of the rotation of bearing circle to produce two pulse signals, and described pulse signal sent to the phase demodulation unit, the frequency of described two pulse signals is identical but have a phase differential, and wherein the phase-lead of one road pulse signal is in another road pulse signal; This phase demodulation unit is connected in described signal generation apparatus, is used for receiving described pulse signal, according to phase sequence and the pulsed frequency of two pulse signals, obtains the two-way phase discrimination signal; This corner information processing unit, be connected in described phase demodulation unit, can receive the two-way phase discrimination signal of described phase demodulation unit output, be that alternating impulse or direct current signal are judged the corner direction according to the two-way phase discrimination signal, and calculate the corner size according to the pulse number of phase discrimination signal.
Wherein, when the bearing circle rotation direction changed, the road pulse signal of leading over another road pulse signal originally lagged behind another road pulse signal; Described two-way phase discrimination signal, when wherein one road phase discrimination signal was the alternating impulse signal, another road phase discrimination signal was direct current signal.
Wherein, this signal generation apparatus further comprises and can be driven and the disk that rotates and a plurality of magnetic posts that are spaced apart and arranged in the disk side by bearing circle; Two pulse signal generators of described signal generation apparatus comprise respectively one can the described magnetic post of sensing Hall element, described Hall element close on the disk side and over against the magnetic post fix, the orientation of two Hall elements is parallel to the tangential direction of disk.
Wherein, described a plurality of magnetic posts are cylindrical that size equates, and the interval between adjacent two magnetic posts equates.
Wherein, described Hall element is the Hall switch effect sensor, and two input ends connect 5V power supply and ground, output terminal output pulse signal respectively; This signal generation apparatus further comprises first shunt capacitance, and this first shunt capacitance, one end connects 5V power supply one end ground connection; Described pulse signal generator further comprises second shunt capacitance and a pull-up resistor respectively; Described second shunt capacitance, an end is connected in the output terminal of Hall element, other end ground connection; Described pull-up resistor, an end is connected in the 5V power supply, and the other end is connected in the output terminal of Hall element.
Wherein, described pulse signal generator further comprises a light emitting diode respectively; Described light emitting diode is connected with a divider resistance respectively, and the series arm of light emitting diode and divider resistance formation, and an end is connected in the output terminal of Hall element, and the other end is connected in the 5V power supply.
Wherein, described pulse signal generator further comprises a reverser respectively; Described reverser is series at the output terminal of Hall element respectively, is used for sending to the phase demodulation unit after the signals reverse with described Hall element output.
Wherein, described phase demodulation unit comprises d type flip flop, NOR gate circuit and first AND circuit and second AND circuit; This d type flip flop, have input end of clock, data input pin, first output terminal and second output terminal, input end of clock and data input pin insert one road pulse signal respectively, first output terminal is connected in an input end of first AND circuit, and second output terminal is connected in an input end of second AND circuit; This NOR gate circuit has two input ends and an output terminal, and two input ends insert one road pulse signal respectively, and output terminal is connected in input end of first AND circuit and an input end of second AND circuit; This first AND circuit, input end connect the output terminal of this NOR gate circuit and first output terminal of this d type flip flop respectively, and output signal is one road phase discrimination signal; This second AND circuit, input end connect the output terminal of this NOR gate circuit and second output terminal of this d type flip flop respectively, and output signal is one road phase discrimination signal.
Wherein, this corner information processing unit comprises arithmetic unit and pulse counting equipment; This pulse counting equipment receives the two-way phase discrimination signal, records the transition times of the rising edge of described phase discrimination signal pulse; Described arithmetic unit is according to the phase discrimination signal phase difference calculating corner direction of exporting in the phase demodulation unit, according to the number of times calculating corner size of this pulse counting equipment statistics.
Wherein, this system further comprises the corner information storage unit, and this corner information storage unit is connected in this corner information processing unit, receives and preserve corner size and corner direction that this corner information processing unit calculates.
The beneficial effect of the utility model embodiment is: produce the two-way pulse by two pulse signal generators; By phase sequence and the pulsed frequency of phase demodulation element analysis two-way pulse, produce the two-way phase discrimination signal; Calculate the corner size and judge the corner direction according to phase discrimination signal by the corner information processing unit.Use signal frequency to calculate the size of corner, using phase discrimination signal is that alternating impulse or direct current signal are judged the corner direction, can guarantee measuring accuracy, does not need high-precision single angular transducer simultaneously, has reduced manufacturing cost.
Description of drawings
The block diagram of a kind of steering wheel angle information acquisition system that Fig. 1 provides for the utility model preferred embodiment;
The synoptic diagram of the signal generation apparatus of a kind of steering wheel angle information acquisition system that Fig. 2 provides for the utility model preferred embodiment;
The circuit diagram of the signal generation apparatus of a kind of steering wheel angle information acquisition system that Fig. 3 provides for the utility model preferred embodiment;
The phase demodulation unit of a kind of steering wheel angle information acquisition system that Fig. 4 provides for the utility model preferred embodiment and the circuit diagram of corner information processing unit;
The output signal synoptic diagram of a kind of steering wheel angle information acquisition system Hall element when bearing circle turns left that Fig. 5 (a) provides for the utility model preferred embodiment;
The output signal synoptic diagram of a kind of steering wheel angle information acquisition system Hall element when bearing circle is turned right that Fig. 5 (b) provides for the utility model preferred embodiment;
The signal flow diagram of a kind of steering wheel angle information acquisition system phase demodulation unit when bearing circle turns left that Fig. 6 (a) provides for the utility model preferred embodiment;
The signal flow diagram of a kind of steering wheel angle information acquisition system phase demodulation unit when bearing circle turns left that Fig. 6 (b) provides for the utility model preferred embodiment.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing the utility model embodiment is described in further detail.
The block diagram of a kind of steering wheel angle information acquisition system that Fig. 1 provides for the utility model preferred embodiment.This system is used for corner size and the corner direction of calculated direction dish, and this system comprises signal generation apparatus 100, phase demodulation unit 200 and corner information processing unit 300.
This signal generation apparatus 100, comprise two pulse signal generators 110,120, be used for when bearing circle rotates, producing two pulse signals, and described pulse signal sent to phase demodulation unit 200, the frequency of described two pulse signals is identical and have a phase differential, and wherein the phase-lead of one road pulse signal is in another road pulse signal.This phase demodulation unit 200 is connected in signal generation apparatus 100, is used for the received pulse signal, according to phase sequence and the pulsed frequency of two pulse signals, obtains the two-way phase discrimination signal.This corner information processing unit 300, be connected in this phase demodulation unit 200, can receive the two-way phase discrimination signal of these phase demodulation unit 200 outputs, be that alternating impulse or direct current signal are judged the corner direction according to the two-way phase discrimination signal, and calculate the corner size according to the pulse number of phase discrimination signal.
Wherein, when the bearing circle rotation direction changed, phase-lead can lag behind another road pulse signal in one road pulse signal phase place of another road pulse signal originally, and therefore, when the bearing circle rotation direction changed, the phase sequence of two pulse signals also changed.The two-way phase discrimination signal, when wherein one road phase discrimination signal is the alternating impulse signal, another road phase discrimination signal is direct current signal, when the corner direction changes, because the phase sequence of two pulse signals changes, therefore the form of each phase discrimination signal changes, and namely changes into direct current signal by the alternating impulse signal, changes into the alternating impulse signal by direct current signal.The direction of corner can be judged by the form of judging phase discrimination signal, the corner size can be calculated by pulse number.Can obtain the size of corner by the angle of default individual pulse correspondence and the number of the pulse that statistics obtains.
Among the present embodiment, corner information processing unit 300 comprises arithmetic unit 320 and pulse counting equipment 310.Pulse counting equipment 310 receives the two-way phase discrimination signal, records the transition times of rising edge of the pulse of described phase discrimination signal, and in other words, pulse counting equipment 310 can be added up the pulse number of phase discrimination signal.Arithmetic unit 320 is alternating impulse or direct current signal according to the two-way phase discrimination signal, judges the corner direction; According to the number of times of pulse counting equipment record, calculate the corner size.
Steering wheel angle information acquisition system among the present embodiment further comprises corner information storage unit 400, corner information storage unit 400 is connected in this corner information processing unit 300, receives and preserve corner size and corner direction that this corner information processing unit 300 calculates.Corner information processing unit 300 among the present embodiment can be single-chip microcomputer, and corner information storage unit 400 can be host computer, as computing machine etc.
The synoptic diagram of the signal generation apparatus of a kind of steering wheel angle information acquisition system that Fig. 2 provides for the utility model preferred embodiment.Wherein, this signal generation apparatus 100 further comprises and can be driven and the disk that rotates and a plurality of magnetic posts that are spaced apart and arranged in the disk side by bearing circle; Described two pulse signal generators 110,120 close on this disk side, arrange over against the magnetic post, and comprise respectively one can the described magnetic post of sensing Hall element, described Hall element close on the disk side and over against the magnetic post fix, the orientation of two Hall elements is parallel to the tangential direction of disk.Hall element by sensing magnetic post close, away from etc. motion, can the production burst signal.
Preferably, described a plurality of magnetic posts are cylindrical that size equates, and the interval between adjacent two magnetic posts equates.
Preferably, need make phase differential between the pulse signal that two Hall elements produce less than each pulse signal high level among a recurrence interval shared phase place and the shared phase place of low level, therefore when the corner direction changes, the phase place difference of the pulse signal that the corresponding Hall element B of the rising edge of the pulse signal that Hall element A among the present embodiment produces produces, the two-way phase discrimination signal that further can guarantee the output of phase demodulation unit are respectively direct current signal and alternating impulse signal and can wrongly survey.
Wherein, described Hall element is the Hall switch effect sensor, and two input ends connect 5V power supply and ground respectively, and output terminal is output as pulse signal.Use the Hall switch effect sensor, can be so that carry out digital processing.
The circuit diagram of the signal generation apparatus of a kind of steering wheel angle information acquisition system that Fig. 3 provides for the utility model preferred embodiment.This signal generation apparatus further comprises first shunt capacitance, and this first shunt capacitance, one end connects 5V power supply one end ground connection, can be used in the inhibition external noise.Described pulse signal generator is except comprising Hall element, further comprise second shunt capacitance and a pull-up resistor respectively, can be used in and suppress components and parts clock internal noise, described second shunt capacitance, one end is connected in the output terminal of Hall element, other end ground connection; Described pull-up resistor, an end is connected in the 5V power supply, and the other end is connected in the output terminal of Hall element.
Pulse signal generator further comprises a light emitting diode respectively; Described light emitting diode is connected with a divider resistance respectively, and the series arm of light emitting diode and divider resistance formation, and an end is connected in the output terminal of Hall element, and the other end is connected in the 5V power supply.Light emitting diode is by divider resistance, and positive pole connects the output terminal that the high level negative pole connects Hall element.By light emitting diode is set, the duty that can show signal generation apparatus in real time, particularly, when bearing circle rotates, Hall element under the normal operating conditions can cause LED flash by output pulse signal, if light emitting diode does not glimmer, then there is fault in signal generation apparatus, need fix a breakdown.
Wherein, described pulse signal generator further comprises a reverser respectively.Reverser is connected to the output terminal of Hall element, is used for sending to the phase demodulation unit after the signals reverse with described Hall element output.In the side circuit, can determine whether that needs arrange reverser according to the design of phase demodulation unit.Among the present embodiment, output 0V low level when Hall element detects the magnetic post is if therefore the phase demodulation unit has used the rising edge d type flip flop, then by reverser is set, can change the redirect direction of the signal that d type flip flop receives, when corner hour, improve measuring accuracy.
The phase demodulation unit of a kind of steering wheel angle information acquisition system that Fig. 4 provides for the utility model preferred embodiment and the circuit diagram of corner information processing unit.Among the present embodiment, this phase demodulation unit 200 comprises d type flip flop, NOR gate circuit and first AND circuit and second AND circuit, can receive the two pulse signals of signal generation apparatus 100 outputs, output two-way phase discrimination signal.Corner information processing unit 300 is realized with the form of single-chip microcomputer, by interface PT0 and PT1, receives the two-way phase discrimination signal.
Wherein, d type flip flop has input end of clock CLK, data input pin D, the first output terminal Q and second output terminal
Receive the two pulse signals of signal generation apparatus 100 outputs, input end of clock and data input pin insert one road pulse signal respectively, first output terminal is connected in an input end of first AND circuit, and second output terminal is connected in an input end of second AND circuit.This NOR gate circuit, have two input ends and an output terminal, receive the two pulse signals of signal generation apparatus 100 outputs, two input ends insert one road pulse signal respectively, and output terminal is connected in input end of first AND circuit and an input end of second AND circuit.D type flip flop among the present embodiment is the edge d type flip flop, more specifically, is the rising edge d type flip flop.By the porch of input end of clock CLK, the level of corresponding data input end D, the first output terminal Q and second output terminal
One tunnel output high level, one tunnel output low level.The NOR gate circuit output signal is pulse, and the alternative frequency of signal is the twice of the alternative frequency of input pulse signal.
First AND circuit, input end connect the output terminal of this NOR gate circuit and first output terminal of this d type flip flop respectively, and output signal is one road phase discrimination signal.This second AND circuit, input end connect the output terminal of this NOR gate circuit and second output terminal of this d type flip flop respectively, and output signal is one road phase discrimination signal.Because the first output terminal Q and second output terminal
Output level, the one tunnel is high level, the one tunnel is low level, so wherein one road phase discrimination signal of two-way phase discrimination signal is pulse signal, frequency is identical with the output signal frequency of this NOR gate circuit, another road phase discrimination signal is direct current signal.
Be appreciated that easily when the bearing circle rotation direction changed, the phase sequence of the signal that input end of clock CLK and data input pin D receive changed, the first output terminal Q and second output terminal
Output level also change, the form of two-way phase discrimination signal changes.Therefore, the form of two-way phase discrimination signal has reflected the direction of corner.
The NOR gate circuit output signal frequency is the twice of the pulse signal frequency of input, therefore the pulse number of phase discrimination signal has further reflected pulse number and the corner size of the pulse signal that signal generation apparatus 100 produces corresponding to the pulse number of NOR gate circuit output signal.If it is N that order is arranged on the number of the magnetic post of disk side, then detect each pulse of phase discrimination signal, corresponding corner size is 360/(2*N).
From the above mentioned as can be known, by the cooperation of signal generation apparatus 100 of the present utility model and phase demodulation unit 200, the phase discrimination signal that obtains has reflected direction and the corner size of steering wheel angle.
The output signal synoptic diagram of a kind of steering wheel angle information acquisition system Hall element when bearing circle turns left that Fig. 5 (a) provides for the utility model preferred embodiment; The output signal synoptic diagram of a kind of steering wheel angle information acquisition system Hall element when bearing circle is turned right that Fig. 5 (b) provides for the utility model preferred embodiment.The signal flow diagram of a kind of steering wheel angle information acquisition system phase demodulation unit when bearing circle turns left that Fig. 6 (a) provides for the utility model preferred embodiment; The signal flow diagram of a kind of steering wheel angle information acquisition system phase demodulation unit when bearing circle turns left that Fig. 6 (b) provides for the utility model preferred embodiment.Among the present embodiment, among the pulse signal of two Hall element generations: shared phase place and the shared phase place of low level of high level equates that dutycycle is 1/2 in other words among the recurrence interval.
More specifically, the following description is with the measurement of system applies of the present utility model in steering wheel angle direction and size, the implementation of explaining in more detail.
Disk is coaxial to be socketed on the steering column of bearing circle, and it can rotate along with the rotation of bearing circle synchronously.Pulse signal generator is arranged on the collection plate, and collection plate closes on the side of this disk to be fixed, and less spacing is arranged between the disk, for example and the spacing between the disk side be 5mm.Pulse signal generator can be responded to the rotation situation of disk in real time, thereby the rotation information of current bearing circle is gathered and exported with the form of digital voltage pulse signal.In the present embodiment, described disk is that circular diameter is 20mm in one, and outside diameter is 76mm, thickness is the plastic disc of 12mm, fixing 60 small magnetic rods on the center line of disk cylindrical circumference successively, the diameter of each magnetic post is 2mm, and the spacing between the small magnetic rod center of circle is 4mm in twos.Disk is coaxial to be socketed in the turning on the column of bearing circle, rotates synchronously along with the rotation of bearing circle.Collection plate is fixed on the disk side with Hall element, can not with disk generation relative motion.
Hall element among the present embodiment is the A3144 Hall element; Be fixed on from the about 40mm of collection plate left margin, close on the disk side and over against the magnetic post fix, the orientation of two Hall elements is parallel to the tangential direction of disk, perpendicular to the rotor shaft direction of disk.During when the rotation of the magnetic post on the disk and near two Hall elements, Hall element output 0V low level; Otherwise Hall element output 5V high level.So along with the rotation of disk, the digital voltage signal that two Hall elements will output level just change
With
Preferably, the A3144 Hall element is wide temperature, the Hall switch effect sensor that Allegro MicroSystems company produces, and its operating temperature range can reach-40 ℃-150 ℃, has characteristics such as size is little, good stability, sensitivity height.
As shown in Figure 3, the operating voltage of A3144 Hall element is 5V, and the output terminal of A, two sensors of B inserts the input end of reverser 74HC04 respectively, sensor according to the pulse signal of the magnetic post responded to output through output pulse signal PA and PB behind the reverser.In order to suppress external noise and components and parts clock internal noise, between 5V power supply and ground, insert first shunt capacitance that capacity is 100nf, between the output terminal of each sensor and ground, insert second shunt capacitance that capacity is 10nf.Because the output terminal of A3144 Hall element is the OC door, therefore need between the output terminal of each sensor and power end, connect the pull-up resistor of a 10k.For the duty of real-time display circuit, at light emitting diode of output terminal access of each sensor.
By Fig. 5 (a) and Fig. 5 (b) as can be known, because the small magnetic rod on the disk is spaced apart, therefore when driver's steering wheel rotation, Hall element can discontinuity and is periodically sensed magnetic post on the disk.When sensing the magnetic post, Hall element is with regard to output low level; Induction is during less than the magnetic post, and then Hall element is just exported high level.When bearing circle turned left, sensors A was sensed small magnetic rod earlier, thus A elder generation output low level, B output low level more then,
Phase place leading
Phase place.In like manner, when bearing circle turned right, sensor B sensed the magnetic post earlier, thus B elder generation output low level, A output low level more then,
Phase lag
Phase place.
By Fig. 4, Fig. 6 (a) and Fig. 6 (b) as can be known, pulse PA, PB insert d type flip flop 74HC74 and the NOR gate circuit 74HC86 in the phase discriminator respectively, and the output terminal with 74HC74 and 74HC86 links to each other with the input end of 2 AND circuit 74HC08 respectively then.The output terminal of 2 74HC08 inserts the PT0 of single-chip microcomputer respectively, the PT1 port.
Behind pulse PA, PB access phase discriminator, if the phase place of PA is ahead of the phase place of PB, then the output terminal Q of d type flip flop 74HC74 continues the output high level,
Continue output low level.Otherwise, if the phase lag of PA in the phase place of PB, then the output terminal Q of d type flip flop 74HC74 continues output low level,
Continue the output high level.And 74HC86 is NOR gate circuit, and it just exports high level when the pulse of input end is varying level.74HC08 is AND circuit, has only and just export high level when the pulse of input end all is high level.Therefore, when bearing circle turns left, have only 6 pin of 74HC08 to have the digital voltage pulse signal PA' of 0V and 5V alternation to export, and the alternative frequency of pulse signal PA' is the twice of the alternative frequency of pulse signal PA, and the digital voltage pulse signal PB' of the 8 pin output of 74HC08 then is continuously the 0V low level.In like manner, when bearing circle turns right, have only 8 pin of 74HC08 to have the digital voltage pulse signal PB' of 0V and 5V alternation to export, and the alternative frequency of pulse signal PB' is the twice of the alternative frequency of pulse signal PB, and the digital voltage pulse signal PA' of the 6 pin output of 74HC08 then is continuously the 0V low level.
Pulse signal PA' is connected with the PT1 interface with the PT0 interface of single-chip microcomputer respectively with the PB' output terminal, single-chip microcomputer begins the rising edge transition times of paired pulses to be counted, impulse hits number of times when therefore the PT0 interface only turns left to bearing circle is counted, and hop value is designated as N
T0, the impulse hits number of times when the PT1 interface only turns right to bearing circle is counted, and hop value is designated as N
T1, then the corner of bearing circle size θ is:
θ＝θ
per*(N
T0-N
T1)＝3*(N
T0-N
T1)
When the θ value be on the occasion of the time, the direction dish is to left movement, when the θ value was negative value, then the direction dish was for moving right.Among the present embodiment, corner information processing unit 300 is realized with the form of freescale single-chip microcomputer MC9S12XS128, be connected with corner information storage unit 400 by serial port communicating protocol RS232, thereby calculate rotational angle and the rotation direction of bearing circle in real time, and result is sent to the corner information storage unit by serial port communicating protocol RS232
Corner information storage unit 400 is a host computer, receives and store the corner information that corner information processing unit 300 transmits in real time, to be used for the later stage to the analyzing and processing of driver's operation behavior data.
Use the steering wheel angle information acquisition system of present embodiment and realize the step of steering wheel angle information acquisition, comprise: after system starts, two pulse signal generators detect the rotation of bearing circle, export two pulse signals and described pulse signal is sent to the phase demodulation unit, the frequency of described two pulse signals is identical but have a phase differential, and wherein the phase-lead of one road pulse signal is in another road pulse signal; The phase demodulation unit receives two pulse signals, phase sequence and pulsed frequency according to two pulse signals send the two-way phase discrimination signal to the corner information processing unit, one road phase discrimination signal is that the high-low level alternative frequency of alternating impulse and this alternating impulse is the twice of the alternative frequency of described pulse signal, and another road phase discrimination signal is direct current signal; The corner information processing unit receives the two-way phase discrimination signal, is that alternating impulse or direct current signal are judged the corner direction according to the two-way phase discrimination signal, and calculates the corner size according to the pulse number of phase discrimination signal.
More specifically, when system starts, Hall element enters duty, when the driver handles bearing circle on the driving simulator, the coaxial disk that is socketed on the steering column also rotates thereupon synchronously, Hall element induction in real time is the magnetic post on the synchronous disk that rotates along with the rotation of bearing circle, and exports the digital voltage pulse signal of two-way 0V low level and 5V high level alternation accordingly
With
Two pulse signals is oppositely exported and pulse signal the back through reverser
Opposite pulse signal PA and PB; Send pulse signal PA and PB to the phase demodulation unit, according to direction and the angle of driver's steering wheel rotation, output high-low level alternative frequency doubles pulse signal PA' or the PB' of PA or PB; PT0 and PT1 interface that PA' and the PB' pulse signal of the output of phase demodulation unit are imported the MC9S12XS128 single-chip microcomputer respectively carry out analyzing and processing, behind the single-chip microcomputer received pulse signal, adopt the mode of regularly interrupting to record the transition times of the pulse signal rising edge of PT0 and the reception of PT1 interface respectively.After calculating in conjunction with corresponding algorithm according to the number of times of saltus step, obtain rotational angle size and the rotation direction ± θ of bearing circle; The while single-chip microcomputer is sent to host computer with the steering wheel angle information that calculates by serial port communicating protocol RS232 and stores, and is used for further data and handles; Regularly whether detection system cuts off the power supply, if system cut-off, then flow process finishes; Otherwise sensor continue to be gathered steering wheel angle information, circulation and so forth, thereby the corner direction of the bearing circle when reaching real-time collection driver and operating and the purpose of corner size.
Embodiment of the present utility model has following advantage:
(1) phase sequence of the pulse signal that produces by two pulse signal generators relation reflection corner direction has guaranteed measuring accuracy;
(2) alternative frequency of the pulse signal that produces by two pulse signal generators reflection corner size, and do not use expensive high-precision angle sensor, reduced cost;
(3) adopt Design of Digital Circuit, the stability of total system and anti-interference are good;
(4) by light emitting diode is set, can show the duty of signal generation apparatus in real time, in time detect, fix a breakdown.
The above; it only is embodiment of the present utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.
Claims (9)
1. steering wheel angle information acquisition system is characterized in that: this system is used for corner size and the corner direction of calculated direction dish, and this system comprises signal generation apparatus, phase demodulation unit and corner information processing unit;
This signal generation apparatus, comprise two pulse signal generators, for detection of the rotation of bearing circle to produce two pulse signals, and described pulse signal sent to the phase demodulation unit, the frequency of described two pulse signals is identical but have a phase differential, and wherein the phase-lead of one road pulse signal is in another road pulse signal;
This phase demodulation unit is connected in described signal generation apparatus, is used for receiving described pulse signal, according to phase sequence and the pulsed frequency of two pulse signals, obtains the two-way phase discrimination signal;
This corner information processing unit, be connected in described phase demodulation unit, can receive the two-way phase discrimination signal of phase demodulation unit output, be that alternating impulse or direct current signal are judged the corner direction according to the two-way phase discrimination signal, and calculate the corner size according to the pulse number of phase discrimination signal.
2. system according to claim 1 is characterized in that,
This signal generation apparatus further comprises and can be driven and the disk that rotates and a plurality of magnetic posts that are spaced apart and arranged in the disk side by bearing circle;
Two pulse signal generators of described signal generation apparatus comprise respectively one can the described magnetic post of sensing Hall element, described Hall element close on disk the side and over against the magnetic post fix, the orientation of two Hall elements is parallel to the tangential direction of disk.
3. system according to claim 2 is characterized in that,
Described a plurality of magnetic post is cylindrical that size equates, and the interval between adjacent two magnetic posts equates.
4. system according to claim 3 is characterized in that,
Described Hall element is the Hall switch effect sensor, and two input ends connect 5V voltage and ground respectively, and output terminal is output as pulse signal;
This signal generation apparatus further comprises first shunt capacitance, and this first shunt capacitance, one end connects high level one end ground connection;
Described pulse signal generator further comprises second shunt capacitance and a pull-up resistor respectively;
Described second shunt capacitance, an end is connected in the output terminal of Hall element, other end ground connection; Described pull-up resistor, an end is connected in the 5V power supply, and the other end is connected in the output terminal of Hall element.
5. system according to claim 4 is characterized in that,
Described pulse signal generator further comprises a light emitting diode respectively;
Described light emitting diode is connected with a divider resistance respectively, and the series arm of light emitting diode and divider resistance formation, and an end is connected in the output terminal of Hall element, and the other end is connected in the 5V power supply.
6. system according to claim 5 is characterized in that,
Described pulse signal generator further comprises a reverser respectively;
Described reverser is series at the output terminal of Hall element respectively, is used for sending to the phase demodulation unit after the signals reverse with described Hall element output.
7. according to the described system of the arbitrary claim of claim 1 to 6, it is characterized in that,
This phase demodulation unit comprises d type flip flop, NOR gate circuit and first AND circuit and second AND circuit;
This d type flip flop, have input end of clock, data input pin, first output terminal and second output terminal, input end of clock and data input pin insert one road pulse signal respectively, first output terminal is connected in an input end of first AND circuit, and second output terminal is connected in an input end of second AND circuit;
This NOR gate circuit has two input ends and an output terminal, and two input ends insert one road pulse signal respectively, and output terminal is connected in input end of first AND circuit and an input end of second AND circuit;
This first AND circuit, input end connect the output terminal of this NOR gate circuit and first output terminal of this d type flip flop respectively, and output signal is one road phase discrimination signal;
This second AND circuit, input end connect the output terminal of this NOR gate circuit and second output terminal of this d type flip flop respectively, and output signal is one road phase discrimination signal.
8. system according to claim 7 is characterized in that,
This corner information processing unit comprises arithmetic unit and pulse counting equipment;
This pulse counting equipment receives the two-way phase discrimination signal, records the rising edge transition times of described phase discrimination signal pulse;
Described arithmetic unit is alternating impulse or direct current signal according to the two-way phase discrimination signal, judges the corner direction; According to the number of times of pulse counting equipment record, calculate the corner size.
9. according to the described system of the arbitrary claim of claim 1 to 6, it is characterized in that,
This system further comprises the corner information storage unit, and this corner information storage unit is connected in this corner information processing unit, receives and preserve corner size and corner direction that this corner information processing unit calculates.
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| CN 201320108186 CN203216450U (en) | 2013-03-11 | 2013-03-11 | Rotation-angle information acquisition system for steering wheel |
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| CN 201320108186 CN203216450U (en) | 2013-03-11 | 2013-03-11 | Rotation-angle information acquisition system for steering wheel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107449376A (en) * | 2017-09-15 | 2017-12-08 | 深圳大学 | A kind of steering wheel angle acquisition system in real time |
| CN111766400A (en) * | 2019-04-02 | 2020-10-13 | 南京大学 | Method for judging positive and negative rotation of rotor based on charge induction |
-
2013
- 2013-03-11 CN CN 201320108186 patent/CN203216450U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107449376A (en) * | 2017-09-15 | 2017-12-08 | 深圳大学 | A kind of steering wheel angle acquisition system in real time |
| CN107449376B (en) * | 2017-09-15 | 2024-05-17 | 深圳大学 | Real-time steering wheel corner acquisition system |
| CN111766400A (en) * | 2019-04-02 | 2020-10-13 | 南京大学 | Method for judging positive and negative rotation of rotor based on charge induction |
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