CN201980095U - Electronic differential system based on relative slippage rate control - Google Patents
Electronic differential system based on relative slippage rate control Download PDFInfo
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- CN201980095U CN201980095U CN2010201459869U CN201020145986U CN201980095U CN 201980095 U CN201980095 U CN 201980095U CN 2010201459869 U CN2010201459869 U CN 2010201459869U CN 201020145986 U CN201020145986 U CN 201020145986U CN 201980095 U CN201980095 U CN 201980095U
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Abstract
The utility model relates to an electronic differential system based on relative slippage rate control, in particular to an electronic differential control system of an electric automobile, which adopts double motors to independently and directly drive double front wheels. The electronic differential system comprises an accelerator, controllers, driving motors, driving wheels, transmission shafts, a turning angle transducer and a calculation processing circuit. The calculation processing circuit can judge the working conditions of the motors according to current signals; and when the working currents of the motors are smaller or zero, the motors are reset and restarted. The calculation processing circuit can convert the rotational speeds of the driving wheels into objective rotational speeds to participate in calculation according to the signals from the turning angle transducer, so that a steering mode is transferred into a straight driving mode; the relative slippage rate is figured out through the rotational speeds of the driving wheels and taken as a controlling parameter, and a feedback-control closed-loop differential adjusting arithmetic is adopted; according to the characteristics of the motors and the structural characteristics of the double-motor independent and direct double driving mode, the electronic differential system has an electronic differential function and an automatic electronic differential adjusting function.
Description
Technical field
The utility model relates to the control system of electronlmobil, relates in particular to the electronic differential control system of the electronlmobil of the independent and direct drive double front wheel of double-motor.
Background technology
Application number is 02136498.2, denomination of invention be " four wheel electronic differential speed steering control system " patent disclosure a kind of four wheel electronic differential speed steering control system, include motor (1), braking mechanism (7), steering hardware (8) and acceleration electric switch (5), it also includes electric machine controller (2), angular-motion transducer (6), tachogen (3) and central process unit (4), described electric machine controller (2), angular-motion transducer (6), tachogen (3), braking mechanism (7), steering hardware (8) and acceleration electric switch (5) are connected respectively to each corresponding port of central process unit (4), this central process unit is gathered the signal of each sensor and on-vehicle parts, and calculate the corresponding rotating speed of target of each wheel, by sending voltage instruction, adjust vehicle wheel rotational speed then to electric machine controller.This four wheel electronic differential speed steering control system keeps the pure rolling state between each wheel and ground in the time of guaranteeing to travel, reduce wheel and ground-surface friction force, prolongs the service life of each parts of automobile.
Application number is 200320123856.5, the utility model name be called " battery-driven car automatic steering differential gear " patent disclosure a kind of automatic electric car steering differential gear.Existing battery-driven car (electronlmobil, road type electro-tricycle) uses mechanical differential gear box, heavy, cost is high, the battery-driven car that has does not have differential, dangerous, turn dumb, the electric vehicle control stalk that also has or press button, switch control, dangerous, inconvenient.This battery-driven car left and right sides Dual-motors Driving, sensing system is laid at the kinematic link place of bearing circle or steering handle, sensing steering angle size, its sensing signal is transported to controller or is directly transported to the sensing system of speed control crank (or pedal speed-adjusting), and two motor speeds were inequality and reach differential effect when battery-driven car was turned.
Application number is 200720107279.9, the utility model name be called " a kind of electronlmobil turns to the electronic differential controller " patent disclosure a kind of electronlmobil turn to the electronic differential controller.This electronic differential controller comprises the left differential signal generation device of bearing circle, right differential signal generation device, acceleration pedal general speed signal generation device, revolver comparator circuit module and the right wheel comparator circuit module of bearing circle.The utility model compares the output that has realized revolver differential control signal by revolver comparator circuit module to the left differential signal and the acceleration pedal general speed signal of bearing circle; Right wheel comparator circuit module compares the output that has realized right wheel differential control signal to the right differential signal and the acceleration pedal general speed signal of bearing circle, has accurate, safe characteristics.
Application number is 200810020544.9, denomination of invention be " differential control system of two-wheeled driven electric vehicle " patent disclosure a kind of differential control system of two-wheeled driven electric vehicle, comprise a left side, right driver module and Coordination module, Coordination module receives external control signal, an output corresponding working signal control left side, the horsepower output of right driver module, a left side, right driver module constantly is transferred to Coordination module with the dtc signal of two drive wheels, the principle that Coordination module equates according to two driving wheel torques judges whether to adjust the working signal of two driver modules, and Coordination module is adjusted a left side by the PID controller, the working signal of right driver module.System architecture of the present invention is simple, be easy to realize, prevent that slippage from appearring in vehicle, reduce Tyte Wear, guarantee the stability of vehicle ', with micro controller system process information precision height, speed is fast, can adjust driving wheel torque in real time, no longer needs transmission device and differential gear, save the space, improved the efficient of driving system.
Application number is 200820188253.6, the utility model name be called " self-adjusting electric speed differential " patent disclosure a kind of self-adjusting electric speed differential, by accelerator, controller, drive motor, drive wheel, transmission shaft, parts such as the universal cover of transmission shaft are formed, it is characterized in that: described accelerator is by accelerator pedal, accelerator pedal connecting rod and acceleration body are formed, about the accelerator signal line divides two, be connected with left and right sides controller respectively, the output line of described controller is the control line of drive motor, the output line of left and right sides controller is connected with left and right sides drive motor respectively, described drive motor is by the transmission shaft of universal cover connection drive wheel, and transmission shaft connects drive wheel.Self-adjusting electric speed differential of the present utility model is mainly used in double-motor independence and the electronlmobil of direct drive mode.Two drive wheels are respectively by two motor direct-drive, and drive motor has been realized double-motor independence and direct drive mode respectively by the controller control of two same sizes, realizes the self-regulating function of electronic differential.Two controllers by same accelerator control, make two machine operation under identical power line voltage.Because the characteristic of motor by the adjusting of different slippage rates, realizes the self-regulating function of electronic differential.
Application number is 200910104063.0, denomination of invention for the patent disclosure of " based on the battery-driven car differential steering control method of slip rate control " a kind of battery-driven car differential steering control method based on slip rate control, this method comprises the steps: that (1) records battery-driven car trailing wheel wheel speed, drive motor actual output torque according to wheel speed sensors, and the side velocity of vehicle; (2) calculate the side velocity and the yaw velocity of elec. vehicle by the two-freedom steering model, calculate the sideslip angle of four wheels again, thereby calculate the rotating speed of four wheels; With the control of dedicated algorithms realization to the electronic differential speed steering of wheel hub elec. vehicle.Torque distribution is calculated in the present invention and the slip rate of wheel combines, make when designed electronic differential speed steering mechanism has differential, also have the effect of differential locking-device, and have reduction of speed and increase the function of turning round, improved elec. vehicle travel crossing ability and turning efficiency greatly; On function, can not only reach the effect of mechanical differential gear box, and improve driving efficiency, reduce the complexity of mechanical system.
The existing electronic differential control system of disclosed electronlmobil, the electronic differential system that has adopted based on slip rate control, the electronic differential control system that has employing to control based on driving torque are arranged, just be based upon the mode under the desirable model, like this, increased the operand of control, control is played pendulum.The utility model adopts relative slippage rate controlling schemes, adopt the reaction type control algorithm, master mode with hysteresis quality, make vehicle at high speed, low speed, turn to, can both realize preferably when keeping straight on differential operation, particularly when the slippage rate smaller value is the critical value of relative slippage rate relatively, the architectural feature of the pattern of and direct drive independent according to the characteristic of motor and double-motor, the electronic differential system has self-regulating function.
Summary of the invention
The purpose of this utility model is, relative slippage rate by two drive wheels is as controlled variable, adopt the reaction type control algorithm, described reaction type control, be that closed loop has poor control system, hysteresis quality with control, and according to the working current of drive motor as the aux. controls parameter, described working current acts on the motor form with torque and acts on and produce driving wheel torque on the drive wheel, computing by arithmetic processing circuit, produce control signal, described control signal is the control voltage signal that the pedal position signal of accelerator produces in arithmetic processing circuit, and its magnitude of voltage is 0.9-3.5U, the work of controlling and driving motor, adopt pressure-adjusting type electronic differential control algorithm, produce the rotating speed of drive wheel, make electronlmobil in high speed, low speed, turn to, can both operate steadily during craspedodrome, reliably, safety, and relative slippage rate≤1% o'clock, according to the independent and architectural feature of direct drive pattern of the characteristic of drive motor and double-motor, the electronic differential system has self-regulating function.
To achieve these goals, the utility model is by the following technical solutions:
Electronic differential system based on relative slippage rate control of the present utility model, it is the electronic differential control system of the electronlmobil of the independent and direct drive double front wheel of double-motor, by accelerator, controller, drive motor, drive wheel, transmission shaft, steering angle sensor, arithmetic processing circuit is formed, described accelerator through the accelerator signal wire joint to described arithmetic processing circuit, be used to transmit accelerator signal, described steering angle sensor is connected on the described arithmetic processing circuit through the steering angle sensor signal wire (SW), transmit the steering angle sensor signal, described controller is through the tach signal line, the current value indicatrix is connected on the described arithmetic processing circuit, the tach signal line transmits tach signal, current value indicatrix delivered current value indicative signal, described arithmetic processing circuit is connected on the described controller through control signal wire, the output signal that produces in the described arithmetic processing circuit of control signal bundle of lines is delivered in the described controller, it is characterized in that: described electronic differential system based on relative slippage rate control, it is the electronic differential control system of the electronlmobil of the independent and direct drive double front wheel of double-motor, described arithmetic processing circuit is to accelerator signal, tach signal, the current value signal, the steering angle sensor signal carries out calculation process, calculate the relative slippage rate of two drive wheel rotating speeds, produce control signal according to relative slippage rate, described control signal is realized the electronic differential function through described controller control rotating speed of motor.
The utility model has the advantages of:
Electronic differential system based on relative slippage rate control of the present utility model, the input data of arithmetic processing circuit are: left and right steering angle sensor signal, accelerator signal, left and right tach signal, left and right current signal, these incoming signals are through the computing of arithmetic processing circuit, produce the output data of arithmetic processing circuit, described output data is left and right control signal.Steering angle sensor has been installed on steering wheel shaft, and the generation of tach signal and current signal, there is not additional sensor, just the terminal voltage value of hall signal that is produced by the function of controller own and current-limiting resistance is converted into, the steering angle sensor signal converts the computing of tach signal by arithmetic processing circuit to the rotating speed of target signal and participates in computing, the drive wheel rotating speed, it is the actual speed of drive wheel, turning to when travelling, the drive wheel rotating speed converts rotating speed of target to through the arithmetic processing circuit calculation process, when the straight-line travelling pattern, the drive wheel rotating speed is exactly a rotating speed of target, and described rotating speed of target makes and turns to driving mode to convert the straight-line travelling pattern to.Obtain relative slippage rate by rotating speed of target, green phase to slippage rate as controlled variable, adopt the closed loop of reaction type control to have difference to regulate algorithm, realize the electronic differential function by regulating control voltage of signals value, particularly relative slippage rate≤1% o'clock, according to the independent and constructional feature of direct drive pattern of the characteristic of motor and double-motor, do not change the value of control signal, but the self-regulating function by electronic differential realizes the electronic differential function, the utlity model has the self-regulating function of electronic differential.The utility model is judged the working condition of motor according to current signal, and is less or when being zero when the working current of motor, turn-offs control signal and makes reset motor, restarts again.
Description of drawings
Fig. 1 is a work scheme drawing of the present utility model.
Fig. 2 is the base scheme drawing of motor of the present utility model.
Fig. 3 is the upward view of Fig. 2.
Fig. 4 is the left view of Fig. 3.
Fig. 5 is the steering wheel assembly scheme drawing.
In the accompanying drawing: 1, accelerator pedal; 2, accelerator pedal connecting rod; 3, accelerator; 4, arithmetic processing circuit; 5, left-hand rotation velocity signal line; 6, left current value indicatrix; 7, left control signal wire; 8, left controller; 9, left hall signal line adapter; 10, left hall signal line; 11, left Hall control line; 12, left driving wheel; 13, Left Drive axle; 14, left joint boot; 15, bolt and spring washer; 16, the erecting frame of motor; 17, nut and spring washer; 18, left motor; 19, left motor power-supply wire; 20, nut and spring washer; 21, bolt and spring washer; 22, right motor power-supply wire; 23, right motor; 24, right Hall control line; 25, nut and spring washer; 26, bolt and spring washer; 27, right joint boot; 28, right transmission shaft; 29, right drive wheel; 30, right hall signal line; 31, right hall signal line adapter; 32, right controller; 33, right control signal wire; 34, right current value indicatrix; 35, right-hand rotation velocity signal line; 36, bearing circle Connection Block; 37, steering wheel shaft; 38, right steering angle transducer signal wire (SW); 39, left steering angle transducer signal wire (SW); 40, steering angle sensor; 41, accelerator signal line; 42, bearing circle; 43, the seat shoulder of right motor; 44, the middle seat shoulder of motor; 45, the seat shoulder of left motor; 46, motor mounting hole.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described further.
Electronic differential system based on relative slippage rate control of the present utility model, as accompanying drawing 1,2,3,4, shown in 5, accelerator 3 is Hall-types, the position of accelerator pedal 1 converts the control voltage signal to by accelerator 3, form accelerator signal 41, the value of accelerator signal 41 is 0.9U to 3.5U, accelerator signal 41 is linked into and carries out calculation process in the arithmetic processing circuit 4, produce control signal, the magnitude of voltage of control signal is 0.9U to 3.5U, be divided into a left side, right two road control signals, left side control signal passes to left controller 8 through left control signal wire 7, and right control signal passes to right controller 32 through right control signal wire 33, makes a left side, right controller produces switch order, control is left respectively, right motor 18,23 with the switch of power accumulator, the size of the magnitude of voltage of control signal, the dutycycle of the power line voltage switch of control motor is by the difference of dutycycle, regulate the size of the power line voltage of motor, make motor produce required torque and rotating speed.The magnitude of voltage of control signal is when 0.9U to 3.5U changes, and the dutycycle of the operating voltage waveform of motor changes from small to large, and the dutycycle maxim is 1, and at this moment, when not having other signals, the operating voltage of motor is the terminal voltage of power accumulator.The position signal of accelerator pedal 1 is converted to the correspondent voltage signal output, is expressed as accelerator signal, is input in the arithmetic processing circuit 4 through accelerator signal line 41; Steering angle sensor 40 is converted to the correspondent voltage signal output to the angular signal of bearing circle 42, the scope of magnitude of voltage is 0-3.5U, be expressed as the steering angle sensor signal, be divided into left and right steering angle sensor signal, be input in the arithmetic processing circuit 4 through left steering angle transducer signal wire (SW) 39 and right steering angle transducer signal wire (SW) 38 respectively; The hall signal of controller, it is digital signal, transmit through the hall signal line, the hall signal line divides left hall signal line 10, right hall signal line 30, left side hall signal line 10 is divided into two the tunnel through left hall signal line adapter 9, wherein one the tunnel is left Hall control line 11, another road is a left-hand rotation velocity signal line 5, right hall signal line 30 is divided into two the tunnel through right hall signal line adapter 31, wherein one the tunnel is right Hall control line 24, another road is a right-hand rotation velocity signal line 35, fast signal turns left, the fast signal of turning right passes through left-hand rotation velocity signal line 5 respectively, right-hand rotation velocity signal line 35, tach signal is input in the arithmetic processing circuit 4, form tach signal, in arithmetic processing circuit, calculate the relative slippage rate of two drive wheels, described two drive wheels are respectively left driving wheel 12 and right drive wheel 29, described relative slippage rate, be the speed discrepancy of two drive wheels and the percentum of drive wheel rotating speed, also can be expressed as the difference of the slippage rate of two drive wheels, draw in the tach signal slave controller hall signal, do not need additional sensor; The current value signal is the terminal voltage value on the controller current-limiting resistance, draws from current-limiting resistance, does not need additional sensor, and left current value indicatrix 6 of process and right current value indicatrix 34 feedbacks are input in the arithmetic processing circuit 4 and participate in computing respectively.In arithmetic processing circuit 4, the primary input signal is an accelerator signal, and auxiliary incoming signal has, left and right current value signal, and left and right tach signal, left and right steering angle sensor signal divides three kinds of six signals.In arithmetic processing circuit 4, these three kinds of six signals are carried out calculation process, produce left control signal, right control signal respectively, be input in left controller 8 and the right controller 32 through left control signal wire 7 and right control signal wire 33 respectively, controller plays on-off action under the effect of control signal, the switch of control power accumulator and motor makes machine operation, the size of the dutycycle of described switch, the size of the operational voltage value of corresponding motor, the work of decision motor.
Assembly relation:
The erecting frame 16 of motor is connected on the car body by bolt or other modes, the left motor 18 of installation between the middle seat shoulder 44 of the seat shoulder 45 of left motor and motor, the right motor 23 of installation between the middle seat shoulder 44 of the seat shoulder 43 of right motor and motor, the erecting frame 16 of motor and motor is by bolt and spring washer 15,21,26 install, again by nut and spring washer 17,20,25 tightenings, bolt and spring washer 15,21,26 are placed in the motor mounting hole 46, left side motor 18 is connected with left joint boot 14 by spline, right motor 23 is connected with right joint boot 27 by spline, one end of Left Drive axle 13 band universal-joints is placed in the left joint boot 14, one end of right transmission shaft 28 band universal-joints is placed in the right joint boot 27, Left Drive axle 13 is connected with left driving wheel 12 by bearing, right transmission shaft 28 is connected with right drive wheel 29 by bearing, and the housing of vehicle is installed in a left side by suspension, right drive wheel 12, on 29.Left side motor 18 connects left controller 8 by left motor power-supply wire 19, right motor 23 connects right controller 32 by right motor power-supply wire 22, the left hall signal line 10 of left side motor 18 connects left hall signal line adapter 9, the right hall signal line 30 of right motor 23 connects left hall signal line adapter 31, also connect left Hall control line 11 and left-hand rotation velocity signal line 5 respectively on the left side hall signal line adapter 9, also connect right Hall control line 24 and right-hand rotation velocity signal line 35 respectively on the right hall signal line adapter 31, left side Hall control line 11 is connected on the left motor 18, right Hall control line 24 is connected on the left motor 23, left-hand rotation velocity signal line 5 and right-hand rotation velocity signal line 35 insert arithmetic processing circuit 4, left side current value indicatrix 6 and left control signal 7 and right control signal wire 33 and right current value indicatrix 34 insert arithmetic processing circuit 4, left side control signal 7 inserts left controller 8, right control signal wire 33 inserts right controller 32, left side current value indicatrix 6 is connected on the current-limiting resistance of left controller 8, right current value indicatrix 34 is connected on the current-limiting resistance of right controller 32, accelerator signal line 41 1 terminations are gone into arithmetic processing circuit 4, the other end inserts accelerator 3, accelerator 3 has accelerator pedal connecting rod 2, connect accelerator pedal 1, bearing circle 42 closure dish axles 37, steering wheel shaft 37 is installed in bearing circle Connection Block 36, deflection angle sensing 40 is installed on the steering wheel shaft 37, deflection angle sensing 40 has left steering angle transducer signal wire (SW) 39 and right steering angle transducer signal wire (SW) 38, and left steering angle transducer signal wire (SW) 39 and right steering angle transducer signal wire (SW) 38 insert arithmetic processing circuit 4.Left side controller 8 and right controller 32 are by the power accumulator power supply, and power accumulator provides electric energy by controller for motor, drive motor work.
Principle of design of the present utility model is as follows:
1 basic condition of the present utility model
The electronlmobil of the electronic differential system based on the control of relative slippage rate of the present utility model is the independent and direct four-wheel electric automobile of f-w-d of double-motor, and the total mass of electronlmobil is m
a=1200kg: minimum turning radius: R
Min=4.8m, turn radius represent with R, height of center of mass: H=0.55m, wheelspan: B=1.380m, wheelbase: L=2.340m, drive wheel radius: r=0.26m, the rating horsepower of single motor: P
o=2.5kw, single phase winding resistance: R=0.25 Ω, torque factor: K
m=0.71 (Nm/A).
2 controlled variable of the present utility model
2.1 steering angle signal
Steering angle sensor is installed on the steering wheel shaft, is used for the deflection angle of direction of measurement dish, bearing circle steering locking angle: α
m=525 °, cooresponding wheel flutter steering locking angle: β
m=35 °, the deflection angle of bearing circle is represented with α, the deflection angle of wheel flutter represents with β, and turning rate is α: β=15: 1, and bearing circle has certain degree of freedom that turns to, the output signal of steering angle sensor is an analog voltage signal, steering angle signal represents that with Φ its span is Φ=0-3.5U, cooresponding steering angle signal: Φ=0.1U during in α=15 °, when Φ≤0.1U, regulation Φ=0U; Value at the left steering angle signal: Φ
A left sideThe value of＞0.1U, right steering angle signal: Φ
RightDuring=0U, be in the left steering operating mode, at this moment, the left side drive wheel is called as interior wheel, and the right side drive wheel is called as foreign steamer, at the value of right steering angle signal: Φ
RightThe value of＞0.1U, left steering angle signal: Φ
A left sideDuring=0U, be in the right steering operating mode, at this moment, the right side drive wheel is called as interior wheel, and the left side drive wheel is called as foreign steamer.The Turning radius of interior wheel: R
In, the Turning radius of foreign steamer: R
Outward
The formula table of Turning radius is shown:
Steering angle signal Φ
A left side, Φ
RightIn arithmetic processing circuit, participate in computing.
2.2 tach signal
Drive motor of the present utility model is the inner-rotor brushless direct current permanent magnet motor, brushless direct current permanent magnet motor has three Hall elements, produce three hall signals, draw outside the motor with three lines, these three lead-in wires are used A respectively, B, C represents, A, B, the C hall signal is a digital voltage signal, A through controller control brushless direct current permanent magnet motor, B, the conducting direction of C three phasevoltage, the voltage signal that accelerator produces, produce control signal through arithmetic processing circuit, described control signal is an analog voltage signal, magnitude of voltage is 0.9U to 3.5U, the on off state of the three phasevoltage of described control signal control brushless direct current permanent magnet motor, the on off state of described three phasevoltage is exactly the dutycycle of three phasevoltage conducting.Select for use in A, B, the C hall signal wherein one tach signal is a digital voltage signal as the tach signal line, brshless DC motor revolution of the present utility model produces 10 digital pulse signals.
Electronlmobil of the present utility model adopts double-motor independence and the pattern of direct drive, and the rotating speed of drive motor is identical with the drive wheel rotating speed, works as Φ
A left side＞0.1U or Φ
RightDuring＞0.1U, be to turn to driving mode, the formula table of inside and outside rotating speed of taking turns is shown:
After converting rotating speed of target to by rotating speed, just turning to the problem of travelling to be transformed into the problem of straight-line travelling to inside and outside drive wheel.
Work as Φ
A left side=0 and Φ
Right=0 o'clock is the straight-line travelling pattern, and the actual speed of inside and outside drive wheel is exactly the rotating speed of target of each drive wheel, and stipulate this moment, the actual speed n of the drive wheel that actual speed is big
1Expression, the actual speed n of the drive wheel that actual speed is little
2Expression, so, n
1〉=n
2
n
1Be called as fast steamer, n
2Be called as wheel slowly.
Rotating speed identification signal y is set, and y is a digital signal, works as n
A left side〉=n
RightThe time, y=0; Work as n
Right＞n
A left sideThe time, y=1.
Tach signal carries out computing in arithmetic processing circuit, calculate the relative error of the rotating speed of target of two drive wheels, and the percentum of described relative error is called as relative slippage rate, represents with δ, and formula is:
The driving torque of drive wheel is the function of electric current, and formula is: M
e=K
mI, wherein, M
eBe the driving torque of drive wheel, K
mBe the torque factor of motor, I is the working current of motor.
The relational expression of rotating speed of motor and counter electromotive force is: E=K
eω, wherein, the counter electromotive force when E is motor rotation, ω are the cireular frequencys of motor rotation axis, K
eIt is the electro-motive force constant.
When adopting unified unit system, numerically, K
m=K
e, be its dimension difference.
The actual speed formula of motor is:
Wherein, U is the operating voltage of motor, and R is the internal resistance of motor, and I is a working current.
2.3 current signal
The rating horsepower of brushless direct current permanent magnet motor of the present utility model is 2.5kw, uses the power accumulator of 60U120Ah, and the maximum current of motor is I
m=120A, the cut-off current of controller is 100A, the rated current 40A of motor, motor adopts natural cooling, this cooperation, the temperature rise of motor is not high, and operating temperature is about 80 ℃, and highest temperature is less than 100 ℃.Current signal is exactly to adopt the terminal voltage value of the current-limiting resistance of measuring controller to be converted into working current value, uses I
UExpression, the terminal voltage maxim of current-limiting resistance: I
Um=200mU, current signal are analog voltage amounts, and current signal is divided into left current signal I
A U left side, right current signal I
The U right side, I
The U right side, I
The U right sideIn arithmetic processing circuit, participate in computing.Electric current I=kI
U, wherein k is the current conversion coefficient, is constant, when I
UInsert on the direct current milivoltmeter, again the scale of milivoltmeter is revised, can be used to measure the working current of motor.
Current value indicator signal I is set
x, I
xBe digital signal, when current value I＞5A, put I
x=1, when I≤5A, put I
x=0, I
xBe divided into left current of electric value indicative signal I
An x left side, right current of electric value indicative signal I
The x right sideWork as I
x=0 o'clock, be defined as the drive motor state that quits work, promptly drive motor is in off-position.
2.4 accelerator signal
The value of accelerator signal is the analog quantity of 0.9-3.5U, and accelerator signal represents that with S S is the function of accelerator pedal position, accelerator pedal position when reference position, S=0.9U, i.e. S
0=0.9U, accelerator pedal when maximum position, S=3.5U, i.e. S
m=3.5U handles through arithmetic processing circuit, produces output signal, and described output signal is exactly a control signal.
2.5 control signal
Control signal is an analog voltage amount, and the size of magnitude of voltage is 0.9-3.5U, and control signal is represented with V, divides left control signal V
A left side, right control signal V
Right, V
A left sideThrough left control signal wire transmission, V
RightThrough right control signal wire transmission.V
A left sideControl left controller, V
RightControl right controller.The principal parameter of control signal V is accelerator signal S, and subsidiary signal has current signal I
U, relative slippage rate δ, slippage rate δ handles generation by steering angle signal with Φ and tach signal n in arithmetic processing circuit relatively.
3 control relation
3.1 the critical value of relative slippage rate
The under-voltage protection value of 60U storage battery is U
Owe=52.5U.The coefficient of correction of regulating voltage: K is set
U=U
In/ U
Owe=U
In/ 52.5.
The relative error of electrotechnical, electronic instrument is as the grade several times of instrument, and the instrument that China produces accuracy class commonly used has 0.005,0.02,0.05,0.1,0.2,0.4,0.5,1.0,1.5,2.5,4.0 etc., relative error is 1% instrument, its several times grade be 1.0 grades.The utility model is selected the critical value of relative slippage rate δ=1% as relative slippage rate for use.
The utility model is a control variable with the relative slippage rate of two drive wheels, at δ≤1% o'clock, according to the independent and architectural feature of direct drive pattern of the characteristic of drive motor and double-motor, realizes the self-regulating function of electronic differential; At δ＞1% o'clock, by the computing of arithmetic processing circuit, obtain the value of control signal V and change the value of V, realize the voltage type electronic differential function.
When turning to, by
, when turning angle of steering wheel α=15 °, δ
Turn to=1%, relative slippage rate δ=1% of inside and outside drive wheel, when α≤15 °, δ≤1%.Adopt the self-regulating function of electronic differential.
3.2 pressure-adjusting type electronic differential pattern
Work as y=0, δ＞1% o'clock reduces left control signal V
A left sideValue, increase right control signal V
RightValue, adopt the reaction type control algorithm, make δ≤1%, reach the purpose of electronic differential.
Work as y=1, δ＞1% o'clock reduces right control signal V
RightValue, increase left control signal V
A left sideValue, adopt the reaction type control algorithm, make δ≤1%, reach the purpose of electronic differential.
When δ≤1%, the electronic differential system has the self-regulating function of electronic differential, reaches the purpose of electronic differential.
Electric current identification signal I
x=0 o'clock, the sign drive motor was in the state of quitting work, and at this moment, arithmetic processing circuit makes control signal corresponding V zero clearing, restarts.As long as I
An x left side=0 o'clock, control signal V
A left sidePut 0, behind 1s, V
A left sideReturn to initial value again, promptly restart; As long as I
The x right side=0 o'clock, control signal V
RightPut 0, behind 1s, V
RightReturn to initial value again, promptly restart.
3.2.1 closed loop has poor control system
Electronic differential system based on relative slippage rate control of the present utility model is that closed loop has poor control system, it is feedback control system, corrective action realizes according to deviation, must there be deviation to adjust, can not reach absolute stability, but can only reach basicly stable, described deviation is exactly relative slippage rate in the utility model, and the utility model is to be control variable with relative slippage rate, realize the function of electronic differential by voltage-regulation, so adopt the pressure-adjusting type electronic differential function of the self-regulating function of relative slippage rate δ≤1% o'clock and relative slippage rate δ＞at 1% o'clock.
3.2.2 self-adjusting electric differential function
Relative slippage rate δ≤1% o'clock,, adopt the electronic differential pattern of self-regulating function according to the independent and architectural feature of direct drive pattern of the characteristic of motor and double-motor.
Relative slippage rate δ≤1% o'clock, through formula
Derive the l-G simulation test data:
(1), fast steamer: U=60U, I=40A, n=672rpm; Slowly take turns: U=60U, I=41.98A, n=665.5rpm, and Δ I=1.98A; Get δ=1.0%.
(2), fast steamer: U=45U, I=40A, n=470.7rpm; Slowly take turns: U=45U, I=41.39A, n=466.1rpm, and Δ I=1.39A; Get δ=1.0%.
(3), fast steamer: U=30U, I=40A, n=269rpm; Slowly take turns: U=30U, I=40.79A, n=266.34rpm, and Δ I=0.79A; Get δ=1.0%.
3.2.3 the correction U of electronic differential regulated value
Transfer
The coefficient of correction of regulating voltage: K
U=U/U
Owe=U/52.5, the span of control signal V is V=0.9-3.5U, V
Transfer=100 δ K
U, be divided into V
Slowly, V
Hurry upThe operating voltage of cooresponding motor is U=2.5-60U, and then the approximation relation formula is: V=0.045 * U+0.8, V
Slowly=V+V
Transfer, V
Hurry up=V-V
TransferThen, U
Slowly=(V
Slowly-0.8)/0.045, U
Hurry up=(V
Hurry up-0.8)/0.045.
As follows with the emulated data casehistory:
(1), two drive wheels: U=50U, I=40A, n=538rpm, V=3.05U;
Drive wheel operating mode difference, then:
Slowly take turns: U=50U, I=50A, n=504.4rpm; Fast steamer: U=50U, I=30A, n=571.6rpm gets δ=13.3%, V
Slowly=2.92U, V
Hurry up=3.18U;
The electronic differential reaction type is regulated:
Slowly take turns: U=47.2U, I=30A, n=533.7rpm; Fast steamer: U=52.8U, I=50A, n=542.3rpm gets δ=1.622%, V
Hurry up=2.938U, V
Slowly=3.161U;
The electronic differential reaction type is regulated:
Slowly take turns: U=52.5U, I=50A, n=537.4rpm; Fast steamer: U=47.5U, I=30A, n=538rpm gets δ=0.11%.At this moment, δ≤1.0%, the electronic differential system changes the self-regulating function pattern into by the pressure-adjusting type adjustment modes, has realized the electronic differential function.
(2), two drive wheels: U=38U, I=40A, n=376.6rpm, V=2.51U;
Drive wheel operating mode difference, then:
Slowly take turns: U=38U, I=50A, n=343rpm; Fast steamer: U=38U, I=30A, n=410.2rpm gets δ=19.61%, V
Slowly=2.368U, V
Hurry up=2.652U;
The electronic differential reaction type is regulated:
Slowly take turns: U=34.8U, I=30A, n=367.8rpm; Fast steamer: U=41.2U, I=50A, n=385.4rpm gets δ=4.782%, V
Slowly=2.614U, V
Hurry up=2.4U;
The electronic differential reaction type is regulated:
Slowly take turns: U=40.3U, I=50A, n=374.2rpm; Fast steamer: U=35.6U, I=30A, n=377.3rpm gets δ=0.83%.At this moment, δ≤1.0%, the electronic differential system changes the self-regulating function pattern into by the pressure-adjusting type adjustment modes, has realized the electronic differential function.
(3), two drive wheels: U=25U, I=40A, n=201.7rpm, V=1.93U;
Drive wheel operating mode difference, then:
Slowly take turns: U=25U, I=50A, n=168.1rpm; Fast steamer: U=25U, I=30A, n=235.4rpm gets δ=40%, V
Slowly=1.735U, V
Hurry up=2.115U;
The electronic differential reaction type is regulated:
Slowly take turns: U=20.8U, I=30A, n=178.4rpm; Fast steamer: U=29.2U, I=50A, n=225.1rpm gets δ=26.12%, V
Slowly=1.87U, V
Hurry up=1.84U;
The electronic differential reaction type is regulated:
Slowly take turns: U=26U, I-50A, n=181.6rpm; Fast steamer: U=23.1U, I=30A, n=209.3rpm gets δ=15.28%, V
Slowly=1.771U, V
Hurry up=2.046U;
The electronic differential reaction type is regulated:
Slowly take turns: U=21.6U, I=30A, n=189.3rpm; Fast steamer: U=27.7U, I=50A, n=204.2rpm gets δ=7.89%, V
Slowly=2.004U, V
Hurry up=1.8U;
The electronic differential reaction type is regulated:
Slowly take turns: U=26.8U, I=50A, n=191.8rpm; Fast steamer: U=22.3U, I=30A, n=199rpm gets δ=3.8%, V
Slowly=1.787U, V
Hurry up=2.023U;
The electronic differential reaction type is regulated:
Slowly take turns: U=21.9U, I=30A, n=194.2rpm; Fast steamer: U=27.2U, I=50A, n=197.5rpm gets δ=1.69%, V
Slowly=2.014U, V
Hurry up=1.794U;
The electronic differential reaction type is regulated:
Slowly take turns: U=27U, I=50A, n=194.9rpm; Fast steamer: U=22.1U, I=30A, n=196.3rpm gets δ=0.741%, at this moment, and δ≤1.0%, the electronic differential system changes the self-regulating function pattern into by the pressure-adjusting type adjustment modes, has realized the electronic differential function.
When U≤20U, according to the independent and architectural feature of direct drive pattern of the characteristic of motor and double-motor, the electronic differential system works under the self-interacting type pattern
The operating voltage U of drive motor can control by accelerator pedal travel, and the deflection angle α of bearing circle can control by direction of passage dish deflection angle, and I is by the drag torque of drive wheel and the characteristic decision of motor.Therefore, accelerator pedal travel and turning angle of steering wheel have determined the rotating speed of drive wheel, and the resisting moment of drive wheel has determined the actual speed of drive wheel, is control variable with relative slippage rate, realizes the function of electronic differential by voltage-regulation.
Electronlmobil of the present utility model, when turning to driving mode, the transformation of speed of the drive wheel when turning to is a rotating speed of target, turning to driving mode to be transformed into the straight-line travelling pattern, relative slippage rate with drive wheel is a control variable, when relative slippage rate δ≤1.0%,, take the electronic differential algorithm of the self-regulating function of feedback mode control according to the independent and architectural feature of direct drive pattern of the characteristic of motor and double-motor; When relative slippage rate δ＞1.0%, take the electronic differential algorithm of the regulating control signal voltage of feedback mode control, be that closed loop has poor control system, the size of the relative slippage rate of foundation realizes, the adjustment process of electronic differential must have the size variation of relative slippage rate, can not reach absolute stability, but can only reach basicly stable, so adopt the pressure-adjusting type electronic differential function of the self-regulating function of relative slippage rate δ≤1% o'clock and relative slippage rate δ＞at 1% o'clock.
Claims (1)
1. electronic differential system based on the control of relative slippage rate, it is the electronic differential control system of the electronlmobil of the independent and direct drive double front wheel of double-motor, by accelerator, controller, drive motor, drive wheel, transmission shaft, steering angle sensor, arithmetic processing circuit is formed, described accelerator through the accelerator signal wire joint to described arithmetic processing circuit, be used to transmit accelerator signal, described steering angle sensor is connected on the described arithmetic processing circuit through the steering angle sensor signal wire (SW), transmit the steering angle sensor signal, described controller is through the tach signal line, the current value indicatrix is connected on the described arithmetic processing circuit, the tach signal line transmits tach signal, current value indicatrix delivered current value indicative signal, described arithmetic processing circuit is connected on the described controller through control signal wire, the output signal that produces in the described arithmetic processing circuit of control signal bundle of lines is delivered in the described controller, it is characterized in that: described electronic differential system based on relative slippage rate control, it is the electronic differential control system of the electronlmobil of the independent and direct drive double front wheel of double-motor, described arithmetic processing circuit is to accelerator signal, tach signal, the current value signal, the steering angle sensor signal carries out calculation process, calculate the relative slippage rate of two drive wheel rotating speeds, produce control signal according to relative slippage rate, described control signal is realized the electronic differential function through described controller control rotating speed of motor.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101954859A (en) * | 2010-03-26 | 2011-01-26 | 刘宗锋 | Electronic differential system based on relative slip ratio control |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101954859A (en) * | 2010-03-26 | 2011-01-26 | 刘宗锋 | Electronic differential system based on relative slip ratio control |
| CN101954859B (en) * | 2010-03-26 | 2013-02-20 | 枣庄学院 | Electronic differential system based on relative slip ratio control |
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