CN1468772A - Vehicle steering control equipment - Google Patents
Vehicle steering control equipment Download PDFInfo
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- CN1468772A CN1468772A CNA031431917A CN03143191A CN1468772A CN 1468772 A CN1468772 A CN 1468772A CN A031431917 A CNA031431917 A CN A031431917A CN 03143191 A CN03143191 A CN 03143191A CN 1468772 A CN1468772 A CN 1468772A
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- steering
- reaction force
- turning velocity
- control apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
- B62D6/008—Control of feed-back to the steering input member, e.g. simulating road feel in steer-by-wire applications
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
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Abstract
This steering control device for a vehicle is provided with a steering reaction adjusting mechanism 16 capable of adjusting the steering reaction of the vehicle; a steering torque detecting means 6 for detecting steering torque inputted by steering operation; and a steering speed detecting means 8 for detecting the speed in steering operation. When the steering torque detected by the steering torque detecting means 6 is a predetermined prescribed torque value or more and the steering speed detected by the steering speed detecting means 8 is a predetermined prescribed speed value or more, it is constituted to increase the steering reaction adjusted by the steering reaction adjusting mechanism 16.
Description
Technical field
The present invention relates to a kind of Vehicular steering control apparatus that can the control vehicle steering reaction force.
Background technology
Recently, a kind of power steering device that turns to auxiliary force (that is: assisted diversion moment of torsion) that can apply is popularized as the turning facilities that uses in vehicle, so that reduce the steering torque that applies when the vehicle driver operates steering handwheel.Basically, this power steering device is constituted as to apply according to the direction of the steering torque that applies along with the steering operation of steering handwheel and size and turns to auxiliary force.And, developed in response to the speed of a motor vehicle and changed another power steering device that turns to auxiliary force.When with the driven at low speed vehicle, increase turns to auxiliary force, so that further reduce steering effort.When the at high speed steering vehicle, reduce turning to auxiliary force, so that the stable sense that turns to is provided.
Except generating the oil pressure power steering device that turns to auxiliary force, also develop the electric motor driven power steering equipment that can use electrical motor to generate to turn to auxiliary power by adopting oil pressure.Because this electric motor driven power steering equipment can adopt variety of way to control and turn to auxiliary power, thereby has proposed many different technologies thoughts.
For example; control with emptier as a kind of; that is: when deflection angle surpasses predetermined deflection angle near steering locking angle; minimizing/correction assisted diversion moment of torsion; so that to the relevant technology of emptier control that the steering swivel system in the electric motor driven power steering equipment is protected, JP-A-2001-253356 has disclosed near a kind of technology that can increase the minimizing correcting value of assisted diversion moment of torsion steering locking angle in response to turning velocity.As a result, even in so-called " the steering handwheel operation of handling fast ", also can protect steering swivel system really.
And, JP-A-9-58493 has disclosed in electric motor driven power steering mechanism, in response to the technology of coming by the speed of a motor vehicle of car speed sensor detection the power of exporting from the electrical motor of power steering device is controlled, and in response to the next technology that power from electrical motor output is limited of the size of the steering torque that detects by torque sensor.These technology can prevent when the at high speed steering vehicle, the excessive rotary manipulation of the steering handwheel that is caused by the steering handwheel maloperation.
On the other hand, the problem that exists of power steering device is above-mentioned emptier control and can to control the technology institute that turns to auxiliary force in response to the speed of a motor vehicle and steering torque insurmountable.
When turning to the aux. controls operation, the vehicle driver can carry out steering operation easily, and feels that the steering handwheel operation is light.On the other hand, it is generally acknowledged that ham-fisted car-driver can be crossed and operate steering handwheel doughtily.If can even then for this ham-fisted car-driver, also can carry out the suitable aux. controls that turns to and operate in response to coming correct adjustment to assist power-assisted such as the specific behavior of the such vehicle of lane changing.
At this technical elements, following technology has been proposed also.Should be noted that following " steering reaction force (antagonistic force) " is in the directive effect opposite with " turning to auxiliary force ".Therefore, minimizing turns to the similar meaning that auxiliary force has increases steering reaction force.
JP-UM-A-2-43765, JP-A-6-92252, JP-A-8-268309 and JP-A-11-129926 have disclosed a kind of technology that can control steering reaction force in response to the vehicle distortion angle.JP-A-6-92253 and JP-A-8-40293 have disclosed and a kind ofly can control the technology of steering reaction force in response to oversteer/understeering state.
Yet, in these conventional control technologys, the sensor that need be able to detect to the various actions of vehicle, thus the vehicle cost is higher.Therefore, cost-cutting becomes the problem that will solve.
Summary of the invention
The present invention is intended to solve these problems of routine techniques.The purpose of this invention is to provide a kind of can correctly control in response to the vehicle behavior turns to auxiliary force (perhaps: the Vehicular steering control apparatus to realize that cost reduces steering reaction force).
According to a first aspect of the invention, provide a kind of Vehicular steering control apparatus, this equipment comprises: the steering reaction force adjusting mechanism, and it can adjust the steering reaction force of vehicle; Steering speed detecting means is used to detect the steering torque that applies by steering operation; The turning velocity detecting device is used to detect the turning velocity when carrying out steering operation; And control setup, be used for when the steering torque that detects by steering speed detecting means more than or equal to the torque rating that presets, and the turning velocity that is detected by the turning velocity detecting device is during more than or equal to the velocity amplitude that presets, the steering reaction force adjusting mechanism is controlled, to increase steering reaction force.
According to a second aspect of the invention, the steering reaction force adjusting mechanism can be made of electric motor driven power steering mechanism.Perhaps, according to a third aspect of the invention we, vehicle can be equipped with the rope control and turn to (steer-by-wire) formula turning facilities, and, the steering reaction force adjusting mechanism can be the steering reaction force applying mechanism, is used to adopt analog system to apply steering reaction force.
According to a forth aspect of the invention, more than or equal to torque rating that presets and turning velocity under the situation more than or equal to the turning velocity that presets, control setup can be set steering reaction force in response to steering torque and turning velocity at steering torque.
In the case, according to a fifth aspect of the invention, control setup can be set this condition, that is: steering torque increases manyly more, the amount of steering reaction force increases just manyly more, and turning velocity increases manyly more, and the amount of steering reaction force just increases manyly more.
According to a sixth aspect of the invention, the turning velocity detecting device can detect the cireular frequency of the cireular frequency of steering handwheel or steering shaft as turning velocity.
Perhaps, according to a seventh aspect of the invention, the turning velocity detecting device can detect as turning velocity the cireular frequency that is contained in the electrical motor in the electric motor driven power steering mechanism.
Under this alternative case, according to an eighth aspect of the invention, the turning velocity detecting device can be predicted the cireular frequency of electrical motor according to voltage between the Terminal of motor and the electric current that offers electrical motor.
Description of drawings
Fig. 1 illustrates the block scheme of the overall formation of Vehicular steering control apparatus according to an embodiment of the invention;
Fig. 2 is the figure that the basic aux. controls operation of being carried out by Vehicular steering control apparatus is described;
Fig. 3 is the figure that damping (damping) control operation of being carried out by Vehicular steering control apparatus is described;
Fig. 4 is the figure that the additional damping control operation of being carried out by Vehicular steering control apparatus is described;
Fig. 5 is the figure that the relation between steering torque in the Vehicular steering control apparatus and the gain is described;
Fig. 6 illustrates the steering wheel angle in the Vehicular steering control apparatus and the figure of effluxion;
Fig. 7 is to by the diagram of circuit of carrying out according to the Vehicular steering control apparatus of first embodiment of the invention that turns to control operation to describe;
Fig. 8 reduces the figure that describes to the auxiliary current by Vehicular steering control apparatus execution according to another embodiment of the present invention;
Fig. 9 is the figure that the relation between motor angle speed in the Vehicular steering control apparatus and the gain is described;
Figure 10 is to by the diagram of circuit of carrying out according to the Vehicular steering control apparatus of second embodiment of the invention that turns to control operation to describe;
Figure 11 reduces the figure that describes to the auxiliary current maxim by Vehicular steering control apparatus execution according to another embodiment of the present invention;
Figure 12 is the figure that the relation between motor angle speed and the gain is described;
Figure 13 is the scheme drawing that another formation that is applicable to steering control system of the present invention is shown; And
Figure 14 is the scheme drawing that another formation that is applicable to steering control system of the present invention is shown.
The specific embodiment
Hereinafter with reference to accompanying drawing, embodiments of the invention are described.
[first embodiment]
Now, the Vehicular steering control apparatus according to first embodiment of the invention is described according to Fig. 1 to Fig. 7.
Be applicable to the control that turns to of electric motor driven power steering mechanism according to the Vehicular steering control apparatus of this first embodiment.The inside of this Vehicular steering control apparatus constitutes shown in the block scheme of Fig. 1.As shown in Figure 1, in this electric motor driven power steering mechanism 16, wheel flutter 1 and steering handwheel 2 mechanical couplings.The setting midway of the steering effort transfer system of definition can apply the electrical motor 3 that turns to auxiliary force (assisted diversion moment of torsion) between steering handwheel 2 and wheel flutter 1.In the present embodiment, DC (direct current) electrical motor is used as electrical motor 3.(direct current) electrical motor 3 is controlled by motor drive circuit 5 by ECU (electronic control unit) 4.
Should be noted that when turning to auxiliary force to adjust (control), also be adjusted simultaneously at the steering reaction force of the directive effect opposite with turning to auxiliary force by this electric motor driven power steering mechanism 16.Therefore, electric motor driven power steering mechanism 16 is as the steering reaction force adjusting mechanism.
In ECU4, calculate the electric current that offers electrical motor 3 according to the detection information and the information of forecasting that obtain from steering torque sensor (steering speed detecting means) 6, car speed sensor 7 and motor angle prediction of speed device (turning velocity detecting device) 8, and electrical motor 3 is controlled by ECU.When operation during steering handwheel 2, electrical motor 3 produce with this supplying electric current be in proportion turn to auxiliary force.Supplying electric current increases manyly more, turns to auxiliary force to increase just manyly more.On the contrary, supplying electric current reduces fewly more, turns to auxiliary force to reduce just manyly more.
In the present embodiment, the cireular frequency of electrical motor 3 is as turning velocity.Motor angle prediction of speed device 8 is configured to the turning velocity detecting device.This technological thought is to set up with the corresponding this point of phase place of steering component (steering handwheel 2 or steering shaft) according to the rotatable phase of electrical motor 3.Particularly, for electrical motor 3, can calculate the motor angle speed of predicting by using voltage (terminal voltage of motor) and motor current between the Terminal of motor electric current of electrical motor 3 (that is: offer).Motor angle prediction of speed device 8 is predicted motor angle speed by carrying out following formula.
ω＝(V
m-I
m*R
m)/K
e---(1)
In the formula, symbol " ω " expression motor angle speed; Symbol " V
m" the expression terminal voltage of motor; Symbol " I
m" the expression motor current; Symbol " R
m" expression electrical motor resistance winding; Symbol " K
e" expression induced voltage constant.
ECU4 is provided with the various functional elements of basic auxiliary quantity setting device 11, damping variable setting apparatus (auxiliary reduction setting device) 12, friciton compensation variable setting apparatus 13 and inertia compensation variable setting apparatus 14.Any functional element in these functional elements all is used to set the electric current that offers electrical motor 3.Particularly, basic auxiliary quantity setting device 11 and damping variable setting apparatus 12 all are the radical function elements that is used to set this supplying electric current, below will describe in detail this.Friciton compensation variable setting apparatus 13 is used for the abrasion loss component of compensated motor 3, and calculates the wear compensation amount according to each speed of electrical motor.Inertia compensation variable setting apparatus 14 is used to compensate the force of inertia component that imposes on electrical motor 3, and calculates the inertia compensation amount according to the angular acceleration of electrical motor 3.
Now, basic auxiliary quantity setting device 11 is described with reference to Fig. 2.Should be noted that Fig. 2, Fig. 3 and electric current " I shown in Figure 4
b" and " I
d" add/minus symbol turns to the auxiliary force direction corresponding with applying.And, the direction of steering torque and motor angle speed all by add/minus symbol represents.
In basic auxiliary quantity setting device 11,, adopt figure shown in Figure 2 to set basic auxiliary quantity (that is: basic auxiliary current) " I according to by the steering torque " T " of steering torque sensor 6 detections and the speed of a motor vehicle " V " that detects by car speed sensor 7
b".As shown in Figure 2, when the steering torque size | T| is less than predetermined value " T
1" time, basic auxiliary current I
bEqual " 0 ".When the steering torque size | T| is more than or equal to predetermined value " T
1" time, basic auxiliary current I
bWith the steering torque size | proportional linear the increasing of the increase of T| reaches another predetermined value " T up to this steering torque size
2" (T
2＞| T| 〉=T
1).Increasing ratio (that is: the characteristic line gradient among Fig. 2) determines according to the speed of a motor vehicle.Basic auxiliary current " I
b" this increase ratio set in the following ways, that is: the speed of a motor vehicle increases manyly more, basic auxiliary current " I
b" reduce just manyly more (that is: shown in Figure 2 characteristic line gradient reduce).And, when the steering torque size | T| further increases, then more than or equal to predetermined value T
2The time, basic auxiliary current I
bBlocked, so that basic auxiliary current I
bCan be not excessive.
In damping variable setting apparatus 12, set damping amount (the damping current) " I that is used to reduce basic auxiliary quantity
d".This damping current I
dBe used for being suppressed at the steering operation that scorch is carried out with big turning velocity (being meant motor angle speed in the case).Damping variable setting apparatus 12 uses steering torque sensor 6, car speed sensor 7 and turning velocity detecting device 8 and adopts figure shown in Figure 3 to set damping current I
dThe damping current I that sets according to motor angle speed " ω " and the speed of a motor vehicle " N "
dSize along with the increase of motor angle speed " ω " linear increasing.Because by reducing basic auxiliary current I
bDirection applies damping current I
d, thereby as shown in Figure 3, along with basic auxiliary current I
bOpposite direction applies damping current I
dThat is to say, under motor angle speed " ω " is positive situation, (selecting under the situation of a direction in anticlockwise direction and the right rotation direction) damping current I
dBe negative current (that is: along the value that reduces the direction of the auxiliary force of a direction), and motor angle speed " ω " for negative situation under (selecting under the situation of the other direction in anticlockwise direction and the right rotation direction), damping current I
dBe positive current (that is: along the value of minimizing) the direction of the auxiliary force of other direction.And, this motor angle speed " ω " and damping current " I
d" between the degree of dip of linear relationship change along with the speed of a motor vehicle.The speed of a motor vehicle increases manyly more, and gradient increases just manyly more.That is to say that the speed of a motor vehicle increases manyly more, damping current increases just manyly more.
In this Vehicular steering control apparatus, in the motor angle velocity magnitude | ω | more than or equal to predetermined value " ω
Th" and the steering torque size | T| is more than or equal to predetermined value " T
Th" situation under, shown in the figure of Fig. 4, additional damping amount (additional damping electric current) further increases along with steering torque size.At this moment, (2) and (3) according to the following equation, according to the motor angle velocity magnitude | ω | and shown in the figure of Fig. 5 in response to the steering torque size | additional damping electric current " I is calculated in the gain that T| provides " K1 "
Da":
I
da＝-K1*(ω-ω
th)---(2)
(annotate: | ω | 〉=ω
ThAnd during ω 〉=O)
I
da＝-K1*(ω+ω
th)---(3)
(annotate: | ω | 〉=ω
ThAnd during ω＜O)
As shown in Figure 5, in the steering torque size | T| is less than " T
Th" condition under, the gain K1 equal " O ".When the steering torque size | T| is more than or equal to " T
Th" time, gain K1 and steering torque size | proportional linear the increasing of the increase of T|, up to the steering torque size | T| reaches predetermined value " T
3" (T
3＞| T| 〉=T
Th).And, if the steering torque size | T| further increases, then more than or equal to this predetermined value " T
3", the K1 that then gains is blocked, so that can not become excessive gain.
Owing to by above-mentioned formation, thereby for example shown in the diagram of circuit of Fig. 7, turn to control operation according to the Vehicular steering control apparatus of first embodiment.
That is to say, read the speed of a motor vehicle " V ", and read steering torque " T " (step S10) from steering torque sensor 6 from car speed sensor 7.Then, use basic auxiliary quantity setting device 11 to calculate basic auxiliary current " I
b" (step S20).Then, read motor current " I from current sensor 9 and voltage sensor 10 respectively
m" and terminal voltage of motor " E
m" (step S30).Then, according to above-mentioned formula (1), according to motor current I
mWith terminal voltage of motor E
mCome calculating motor cireular frequency " ω " (step S40).
And, use damping variable setting apparatus 12 to calculate basic damping current " I
d" (step S50).
The predetermined angle speed that supposition now is configured for carrying out the reference angle speed of additional damping operation is " ω
Th", Vehicular steering control apparatus is judged the steering torque size | whether T| is more than or equal to predetermined value T
Th(step S60).| T|＜T
ThThe time, from ECU 4 output auxiliary current " I
b+ I
d" (step S100).And, | T| 〉=T
ThThe time, Vehicular steering control apparatus is judged the motor angle velocity magnitude | ω | and whether more than or equal to predetermined value " ω
Th" (step S70).| ω |＜ω
ThThe time, from ECU4 output auxiliary current " I
b+ I
d" (step S110), and | ω | 〉=ω
ThThe time, calculate additional damping electric current " I according to above-mentioned formula (2) and (3)
Da" (step S80).Then, from ECU4 output " I
b+ I
d+ I
Da" as regulation auxiliary current (step S90).
As mentioned above, in the steering torque size | T| is more than or equal to predetermined value T
ThAnd motor angle speed (turning velocity) size | ω | more than or equal to predetermined value ω
ThCondition under because the additional damping electric current I
DaAdditional be used to control the motor power of steering reaction force, thereby can be suppressed the excessive rotary manipulation of chaufeur steering handwheel 2.That is to say, when chaufeur excessively rotates steering handwheel suddenly, motor angle speed (turning velocity) size | ω | and the steering torque size | T| increases.When setting up following condition, that is: steering torque size | T| is more than or equal to predetermined value and motor angle speed (turning velocity) size | ω | during more than or equal to this condition of predetermined value, Vehicular steering control apparatus can be judged as the rotary manipulation strong excessively (too fast) of steering handwheel 2.In the case, increase the additional damping electric current I
Da, so that the excessive rotary manipulation that relies on this excess speed and the powerful steering handwheel 2 that carries out is suppressed.
Fig. 6 is illustrated under the situation of carrying out the additional damping control operation and the figure of the difference between the behavior of the steering handwheel 2 under the situation of not carrying out the additional damping control operation.This diagram shows, the driving condition of carrying out when not carrying out the additional damping control operation is compared, and by relying on additional damping to operate to suppress the large amplitude of crossing of steering wheel angle, can quickly recover to stabilized conditions to driving condition.
For example, when carrying out the steering wheel angle operation at lane changing, shown in the dotted line of Fig. 6, if steering handwheel 2 is excessively rotated, then car body excessively rotates.In order to recover the car body direction, steering handwheel must in the opposite direction excessively rotate.Therefore, the steering handwheel operation can not restrain fast.
Yet, under the situation of the control that relies on additional damping operation, shown in the solid line of Fig. 6, in the process that increases steering wheel angle (that is: in rotation or increase in the process at this angle), at " t constantly
1" and " t
2" between, " t
3" and " t
4" between and " t
5" and " t
6" between as can be seen, need big steering torque.When turning velocity is also higher, carry out big additional damping, so that can the increase of steering wheel angle be suppressed.The result, with compare at the state that does not carry out obtaining under the situation of additional damping control operation, the rotation of steering wheel angle is reduced, and the body oscillating that the counteraction that the rotation by steering handwheel is produced causes reduces, thus can be at short notice the steering handwheel operation either converges to stabilized conditions.
Increase the additional damping electric current I in response to the value of steering torque " T " and the value of motor angle speed (turning velocity) " ω "
DaSteering torque " T " and motor angle speed (turning velocity) " ω " increase manyly more, additional damping electric current " I
Da" increase just manyly more.Therefore, can carry out correct control operation in response to the behavior of vehicle.
When so-called when carrying out " the steering handwheel operation of handling fast " or steering handwheel maloperation,, can make chaufeur recognize this maloperation by increasing steering reaction force.Therefore, can be chaufeur and carry out correct driving guidance.
And, operate owing to when deflection angle speed and steering torque all surpass predetermined value, apply additional damping, thereby for example,,, then also can not apply additional damping and operate if steering torque is less even when turning velocity is higher.That is to say that (that is: when increasing steering wheel angle) applies the additional damping operation when the vehicle driver rotates wheel flutter 2, during this period, chaufeur needs big steering torque.Yet, when chaufeur is transferred revolution steering handwheel 2 (that is: minimizing steering wheel angle), do not apply the additional damping operation, during this period, do not need so big steering torque.Therefore, additional damping can not disturb and make chaufeur then this operation of revolution steering handwheel 2, so that vehicle behavior stability.And, in the high vehicle of center-of-gravity position,, thereby can suppress the excessive rolling of vehicle because when fast rotational steering handwheel 2, steering reaction force increases.
In addition, there is this advantage, that is: because all the sensors that adopts in above-mentioned control operation is all corresponding with accepted standard equipment in electric motor driven power steering mechanism, thereby can be in response to the vehicle behavior with low-cost and turn to auxiliary force (steering reaction force) with correct way control.
[second embodiment]
Below will the Vehicular steering control apparatus according to second embodiment of the invention be described.Although the formation of this Vehicular steering control apparatus and first embodiment are basic identical, yet turn to the control operation difference.That is to say, in first embodiment, all under the situation more than or equal to predetermined value, apply the additional damping operation in response to the steering torque size, so that the control outgoing current in steering torque and motor angle speed.By contrast, according to second embodiment, as Fig. 8 and shown in Figure 9, it is as follows to turn to control operation to carry out: at steering torque " T " and motor angle speed " ω " under the situation more than or equal to predetermined value (| ω | 〉=T
ThWith | ω | 〉=ω
Th), determine basic auxiliary coefficient " K2 " in response to the motor angle velocity magnitude; Make with the cooresponding basic auxiliary current of steering torque and multiply each other, set basic auxiliary current " I with this basic auxiliary coefficient K2
b"; Therefore, according to the basic auxiliary current " I of this setting
b" come the electric current at control motor 3.
That is to say basic auxiliary current " I
b" be set as follows:
I
b＝k*|T|---(4)
(at T
1≤ | T|＜T
ThThe time, symbol " k " is the coefficient that constitutes the gradient of basic feature)
I
b＝I
1+k*K2*(|T|-T
th)---(5)
(| T| 〉=T
ThThe time, symbol " k " is the coefficient that constitutes the gradient of basic feature)
As shown in Figure 9, basic auxiliary coefficient " K2 " is the value of determining according to motor angle velocity magnitude " | ω | "." | ω |＜ω
Th" time, basic auxiliary coefficient K2 is a constant.When the motor angle velocity magnitude | ω | more than or equal to predetermined value " ω
Th" time, basic auxiliary coefficient K2 is along with the motor angle velocity magnitude | ω | increase and linear the minimizing, up to this value | ω | reach the value " ω that presets
1" (ω
Th≤ | ω |＜ω
1).And, when the motor angle velocity magnitude | ω | more than or equal to predetermined value " ω
1" time, basic auxiliary coefficient K2 becomes 0, and auxiliary current I
bBecome I
1Value.
Although Fig. 8 only shows the figure of the specific speed of a motor vehicle, however similar with first embodiment, set basic auxiliary current I according to the speed of a motor vehicle
b
Owing to by above-mentioned formation, thereby for example shown in the diagram of circuit of Figure 10, turn to control operation according to the Vehicular steering control apparatus of second embodiment.
In this Vehicular steering control apparatus, because it is identical with first embodiment in the processing operation that step S70 is defined previously, that is to say, the condition judgment that steering torque is done more than or equal to the situation of predetermined value more than or equal to predetermined value and motor angle speed is identical with first embodiment, thereby the step after step S70 describes.
In step S70, | ω | 〉=ω
ThThe time, calculate basic auxiliary coefficient " K2 " (step S81).Then, calculate final basic auxiliary current " I according to above-mentioned formula (4) and (5)
b".Afterwards, export this auxiliary current " I from ECU4
b+ I
d" as determined electric power (step S91).
As mentioned above, in the steering torque size | T| and motor angle speed (deflection angle speed) size | ω | under the condition more than or equal to predetermined value, reduce by estimated rate owing to be used to control the basic auxiliary current of the motor power of steering reaction force, thereby can suppress the excessive rotary manipulation of chaufeur steering handwheel 2.This can be avoided vehicle because the nonsteady behavior that so-called " the steering handwheel operation of handling fast " or steering handwheel maloperation cause.
Fig. 6 shows difference between the behavior of carrying out and do not carry out the steering handwheel 2 under the additional damping control operation situation with graphics mode, shown in the figure of Fig. 6, compare with the situation of not carrying out the additional damping control operation, by adopting and the similar mode of first embodiment of the invention, the dependence additional damping is operated the large amplitude of crossing that suppresses steering wheel angle, can quickly recover to stabilized conditions to driving condition.
And, increase the additional damping electric current I in response to the value of steering torque " T " and the value of motor angle speed (turning velocity) " ω "
DaSteering torque " T " and motor angle speed (turning velocity) " ω " increase manyly more, additional damping electric current " I
Da" increase just manyly more.Therefore, can carry out correct control operation in response to the vehicle behavior.
When so-called when carrying out " the steering handwheel operation of handling fast " or steering handwheel maloperation,, can make chaufeur recognize this maloperation and mal degree by increasing steering reaction force.Therefore can be chaufeur and carry out correct driving guidance.
When deflection angle speed and steering torque all surpass predetermined value, apply the additional damping operation.For example, even when turning velocity is higher,, then do not apply the additional damping operation if steering torque is less.When chaufeur rotation steering handwheel 2, apply the additional damping operation, during this period, chaufeur needs big steering torque.Yet, when the vehicle driver transfers revolution steering handwheel 2, do not apply the additional damping operation, during this period, do not need so big steering torque.Therefore, additional damping can not disturb chaufeur then this operation of revolution steering handwheel 2, so that vehicle behavior stability.And, in the high vehicle of center-of-gravity position,, thereby can suppress the excessive rolling of vehicle because when fast rotational steering handwheel 2, steering reaction force increases.
In addition, there is this advantage, that is: because all the sensors that adopts in above-mentioned control operation is all corresponding with the standard equipment that uses in electric motor driven power steering mechanism, thereby can be in response to the behavior of vehicle with low-cost and turn to auxiliary force (steering reaction force) with correct way control.
Although above various embodiment of the present invention are described, yet the present invention is not limited only to these embodiment, and can make amendment, change under the situation that does not deviate from technical spirit of the present invention and scope or substitute.
For example, in a second embodiment, outgoing current adopts this method to control, that is: when steering torque size and motor angle velocity magnitude during all more than or equal to predetermined value, determine basic auxiliary coefficient K2 in response to the motor angle velocity magnitude, then, the auxiliary current that relies on steering torque to determine is multiplied each other with basic auxiliary coefficient K2.Perhaps, can determine the maxim " I of basic auxiliary current in response to motor angle speed
Max", and do not obtain basic auxiliary coefficient " K2 ", then, can adopt this mode to control outgoing current, that is: according to this maxim I
MaxLimit the basic auxiliary current that relies on steering torque to determine.
Under this alternative case, for example,,, reduce current maxima " I in response to this condition when motor angle speed during more than or equal to predetermined value as Figure 11 and shown in Figure 12
Max".Therefore, in the scope of steering torque, can rely on current maxima I more than or equal to predetermined value
MaxLimit auxiliary current.That is to say current maxima I
MaxBe according to the motor angle velocity magnitude | ω | the value of determining.| ω |＜ω
ThThe time, this current maxima I
MaxBe steady state value.When the motor angle velocity magnitude | ω | surpass this value ω
ThThe time, this value (ω
Th＜| ω |＜ω
2) along with the motor angle velocity magnitude | ω | increase and linear the minimizing, up to this size | ω | reach predetermined value " ω
2".And, when this size | ω | more than or equal to predetermined value " ω
2" time, current maxima I
MaxBecome minimum value " I
1", and auxiliary current I
bBecome this minimum value " I
1".
In the above-described embodiments, the turning facilities that uses electric motor driven power steering mechanism has been made casehistory.Perhaps, can adopt another turning facilities that the rope control turns to (steer-by-wire) formula power steering mechanism is housed, rather than this electric motor driven power steering mechanism.And, can adopt another turning facilities that oil pressure dynamic steering mechanism is housed.
For example, as shown in figure 13, make in the rope control steering-type steering swivel system that wheel flutter turns at this use steering actuator, steering reaction force can adopt this mode to adjust/control, that is: ECU4 reads each self-information of relevant steering torque and turning velocity, then the steering reaction force applying mechanism (steering reaction force adjusting mechanism) of attaching steering handwheel 2 is controlled.
For example, for shown in Figure 14 this oil pressure dynamic steering mechanism, steering reaction force can adopt this mode to adjust/control, that is: ECU4 reads each self-information of relevant steering torque and turning velocity, controls oil pressure unit then.
As detailed above, vehicle according to the invention steering control apparatus (first to described in the third aspect), although only utilize the standard transducer of power steering mechanism, yet can obtain in the vehicle driving operation process, to suppress this steering reaction force characteristic of the steering operation of manipulation fast.That is to say, have this advantage, that is: can turn to auxiliary force (perhaps, steering reaction force) with correct way and with low cost control in response to the vehicle behavior.
And, when determining steering reaction force, not only consider turning velocity, and consider steering torque.As a result, for example, can assist turning to of the gyratory directions that turns to auxiliary and steering handwheel of the excessive hand of rotation of steering handwheel to differentiate.Therefore, this can not disturb chaufeur then this operation of revolution steering handwheel, so that vehicle behavior stability.And, in the high vehicle of center-of-gravity position, owing to steering reaction force along with the operation of quick operating steering handwheel increases, thereby can suppress the excessive rolling of this vehicle.
In addition, owing to utilize all standard transducers that in power steering mechanism, adopt, thereby can improve the reliability of steering control apparatus, and can reduce its likelihood of failure.
And, according at the described Vehicular steering control apparatus of second aspect,, thereby can be easily under response characteristic preferably, carry out it and turn to control operation because this power steering mechanism is corresponding with electric motor driven power steering mechanism.
And, according at the described Vehicular steering control apparatus of the third aspect, owing to be provided with the steering reaction force application devices, thereby can carry out it easily and turn to control operation, can keep response characteristic preferably simultaneously.
And, according at the described Vehicular steering control apparatus of fourth aspect, owing to can apply correct steering reaction force in response to turning velocity and steering torque size, thereby to have an advantage be to avoid risk that vehicle is played pendulum in advance.
And, according to described Vehicular steering control apparatus aspect the 5th, even when the vehicle driver carried out strong steering handwheel operation mistakenly, because the degree in response to this strong excessively steering handwheel operation applies correct steering reaction force, thereby can adopt the mode of correctly carrying out steering operation to come direct drivers.Therefore, having a kind of advantage is to make the driving performance of vehicle stable.
And according to aspect the 6th and the described Vehicular steering control apparatus in the 7th aspect, having a kind of advantage is to detect turning velocity really so that turn to control operation.
And, according at the described Vehicular steering control apparatus of eight aspect, no longer need this sensor that can detect motor angle speed, thus but cost-cutting.
And owing to be used for detecting the sensor of terminal voltage of motor and motor current sensor with corresponding at electric motor driven power steering mechanism accepted standard sensor, thereby to have a kind of advantage be to be suppressed to low value to rate of breakdown.
Claims (8)
1. Vehicular steering control apparatus, this equipment comprises:
The steering reaction force adjusting mechanism, it can adjust the steering reaction force of vehicle;
Steering speed detecting means is used to detect the steering torque that applies by steering operation;
The turning velocity detecting device is used to detect the turning velocity when carrying out steering operation; And
Control setup, be used for when the steering torque that detects by steering speed detecting means more than or equal to the torque rating that presets, and the turning velocity that is detected by the turning velocity detecting device is during more than or equal to the velocity amplitude that presets, the steering reaction force adjusting mechanism is controlled, to increase steering reaction force.
2. Vehicular steering control apparatus according to claim 1, wherein, the steering reaction force adjusting mechanism is an electric motor driven power steering mechanism.
3. Vehicular steering control apparatus according to claim 1, this equipment also comprise rope control steering-type turning facilities, and wherein, the steering reaction force adjusting mechanism is the steering reaction force applying mechanism, are used to adopt analog system to apply steering reaction force.
4. according to claim 1 any one described Vehicular steering control apparatus to the claim 3, wherein, more than or equal to torque rating that presets and turning velocity under the situation more than or equal to the turning velocity that presets, control setup is set steering reaction force in response to steering torque and turning velocity at steering torque.
5. Vehicular steering control apparatus according to claim 4, wherein, control setup is set this condition, that is: steering torque increases manyly more, the amount of steering reaction force increases just manyly more, and turning velocity increases manyly more, and the amount of steering reaction force just increases manyly more.
6. according to claim 1 any one described Vehicular steering control apparatus to the claim 5, wherein, the turning velocity detecting device detects the cireular frequency of steering handwheel or the cireular frequency of steering shaft, this cireular frequency as turning velocity.
7. Vehicular steering control apparatus according to claim 2, wherein, the turning velocity detecting device detects the cireular frequency that is contained in the electrical motor in the electric motor driven power steering mechanism, this cireular frequency as turning velocity.
8. Vehicular steering control apparatus according to claim 7, wherein, the turning velocity detecting device is predicted the cireular frequency of electrical motor according to voltage between the Terminal of motor and the electric current that offers electrical motor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP164892/2002 | 2002-06-05 | ||
| JP2002164892A JP2004009857A (en) | 2002-06-05 | 2002-06-05 | Steering control device for vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1468772A true CN1468772A (en) | 2004-01-21 |
| CN1250420C CN1250420C (en) | 2006-04-12 |
Family
ID=29720185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03143191 Expired - Fee Related CN1250420C (en) | 2002-06-05 | 2003-06-05 | Vehicle steering control equipment |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2004009857A (en) |
| CN (1) | CN1250420C (en) |
| DE (1) | DE10325587B4 (en) |
| TW (1) | TWI263605B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| TW200307617A (en) | 2003-12-16 |
| TWI263605B (en) | 2006-10-11 |
| JP2004009857A (en) | 2004-01-15 |
| DE10325587B4 (en) | 2006-03-16 |
| CN1250420C (en) | 2006-04-12 |
| DE10325587A1 (en) | 2004-01-08 |
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