EP2004427A2 - Système destiné à influencer le comportement routier d'un véhicule automobile - Google Patents

Système destiné à influencer le comportement routier d'un véhicule automobile

Info

Publication number
EP2004427A2
EP2004427A2 EP07723740A EP07723740A EP2004427A2 EP 2004427 A2 EP2004427 A2 EP 2004427A2 EP 07723740 A EP07723740 A EP 07723740A EP 07723740 A EP07723740 A EP 07723740A EP 2004427 A2 EP2004427 A2 EP 2004427A2
Authority
EP
European Patent Office
Prior art keywords
vehicle
value
wheel
determined
change
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07723740A
Other languages
German (de)
English (en)
Inventor
Johannes Kopp
Martin Moser
Reinhold Schneckenburger
Christian Urban
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP2004427A2 publication Critical patent/EP2004427A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
    • B60G17/016—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by their responsiveness, when the vehicle is travelling, to specific motion, a specific condition, or driver input
    • B60G17/0162—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by their responsiveness, when the vehicle is travelling, to specific motion, a specific condition, or driver input mainly during a motion involving steering operation, e.g. cornering, overtaking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
    • B60G17/016—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by their responsiveness, when the vehicle is travelling, to specific motion, a specific condition, or driver input
    • B60G17/0165—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by their responsiveness, when the vehicle is travelling, to specific motion, a specific condition, or driver input to an external condition, e.g. rough road surface, side wind
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
    • B60G17/033—Spring characteristics, e.g. mechanical springs and mechanical adjusting means characterised by regulating means acting on more than one spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/176—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS
    • B60T8/1764—Regulation during travel on surface with different coefficients of friction, e.g. between left and right sides, mu-split or between front and rear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/80—Interactive suspensions; arrangement affecting more than one suspension unit
    • B60G2204/81—Interactive suspensions; arrangement affecting more than one suspension unit front and rear unit
    • B60G2204/8102—Interactive suspensions; arrangement affecting more than one suspension unit front and rear unit diagonally arranged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/05—Attitude
    • B60G2400/052—Angular rate
    • B60G2400/0523—Yaw rate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/10—Acceleration; Deceleration
    • B60G2400/104—Acceleration; Deceleration lateral or transversal with regard to vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/80—Exterior conditions
    • B60G2400/82—Ground surface
    • B60G2400/822—Road friction coefficient determination affecting wheel traction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
    • B60G2800/01—Attitude or posture control
    • B60G2800/016—Yawing condition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
    • B60G2800/22—Braking, stopping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
    • B60G2800/24—Steering, cornering
    • B60G2800/244—Oversteer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T2260/00—Interaction of vehicle brake system with other systems
    • B60T2260/06—Active Suspension System

Definitions

  • the invention relates to a method and a device for influencing the driving behavior of a vehicle.
  • the vehicle includes fluid suspensions associated with the respective wheels, means for supplying and discharging fluid into and out of the respective fluid suspensions for expansion and contraction of the suspensions independently, and control means for adjusting the supply and discharge devices for controlling vehicle heights at the respective wheels ,
  • the lateral acceleration of the vehicle is detected, and in response to the detected lateral acceleration, a lift control amount is determined which is directly proportional to the lateral acceleration.
  • the vehicle height of the right front wheel is decreased by the lift control amount and the vehicle height of the left front wheel is raised by the lift control amount and the vehicle height of the right rear wheel is raised by the lift control amount and Vehicle height of the left rear wheel lowered by the Hubquettegroße.
  • Suspension units of the rear wheels increased by the same amount, on the other hand, the fluid pressure on the inside of the curve is reduced by the same amount. Overall, there is a yaw moment in the direction of oversteer.
  • the absolute values of the load changes of the individual wheels are the same. The load on a diagonally opposite pair of wheels increases, while the load on the other diagonally opposite pair of wheels decreases. It occurs a load shift, without changing the position of the vehicle body.
  • the vehicle first control means for controlling a the
  • the two control means interact in such a way that, in the case of at least one control means, an amount entering the respective control is influenced as a function of a size of the other control means.
  • control means for influencing wheel contact forces occurring at the vehicle wheels it may also be corresponding control means.
  • an input into the controller is then influenced as a function of a size of the other control means.
  • a desired value for the yaw angular velocity is influenced as a function of a variable which is present in the second control means is generated and represents the to be carried out by the second control means influencing the Radaufstandskrafte.
  • a large which is determined in the determination of said drive magnitudes starting from the actual value and the desired value of the yaw rate as an intermediate and / or which is taken into account in this determination or enters into this, to influence in a corresponding manner.
  • a variable which represents the influencing of the wheel contact forces to be carried out by the second control means is influenced as a function of a deviation quantity determined in the first control means, which represents a deviation between an actual value and the desired value of the yaw angular velocity.
  • the presence of braking on a roadway is detected with different coefficients of friction for the two sides of the vehicle, wherein in the presence of such braking, at least at times a chassis arranged in the vehicle is braced diagonally.
  • a turning amount is determined representing a present turning of the vehicle.
  • the wheel contact force is influenced according to a functional relationship as a function of the determined curve size.
  • the functional relationship is modified, and the influencing of the wheel-treading force in accordance with the modified functional relationship is carried out as a function of the turning magnitude.
  • an associated value for the change quantity is determined for a respectively determined value of the curve size.
  • the turning amount is a magnitude describing the lateral acceleration.
  • a variable describing the yaw rate instead of a variable describing the lateral acceleration.
  • a variable describing the lateral acceleration has the advantage over a magnitude describing the yaw rate that the lateral force transferable and the lateral force transferable by the wheels are directly related, or that the magnitude describing the lateral acceleration and the skew angle occurring at the vehicle wheels are directly related.
  • the high yaw rate describing high speed is dependent.
  • variable describing the lateral acceleration can be determined in different ways. So this size can be measured by means of a lateral acceleration sensor. However, this variable can also be determined as a function of a variable describing the steering angle and a variable describing the vehicle speed.
  • the latter approach has the following advantage over the use of a lateral acceleration sensor: Usually, a lateral acceleration sensor is designed as an inertial sensor, whereas a steering angle sensor is not. In addition, cornering is initiated by adjusting a Radlenkwinkels on the steered wheels. This leads due to the inertia of the vehicle body, delayed to a lateral acceleration, which is arranged by a vehicle
  • Transverse acceleration sensor is detected. Consequently, in the case where the magnitude describing the lateral acceleration is determined in accordance with the quantity describing the steering angle, cornering can be detected earlier in time.
  • a vehicle has a left and a right front wheel and a left and a right rear wheel.
  • a front wheel and a rear wheel of one of the two vehicle diagonals are assigned.
  • the wheel contact forces on the two vehicle wheels are influenced according to the functional relationship as a function of the curve size, wherein the wheel contact forces are changed in the same direction at these two vehicle wheels.
  • the same - minded influence on the Radaufstands exert on the two vehicle wheels of a vehicle diagonal is the prerequisite for the vehicle level remains unchanged despite a change in the wheel contact forces.
  • Under the same direction change of the wheel contact forces on the two vehicle wheels of a vehicle diagonal is to be understood as follows: At these two vehicle wheels RadaufStandskraft is either increased simultaneously or simultaneously reduced.
  • the individual vehicle wheels are each assigned actuators for wheel-specific influencing of the wheel contact force occurring at the respective vehicle wheel.
  • wheel-individual influencing the wheel contact force occurring at the respective vehicle wheel the following is to be understood:
  • the actuator which is assigned to the vehicle wheel whose wheel contact force is to be influenced in a targeted manner is actuated.
  • this also inevitably changes to a certain extent the respective RadaufStandskraft those vehicle wheels whose actuators are not controlled.
  • this is not intended to prevent the designation of this type of activation of the actuators associated with the vehicle wheels from influencing the wheel contact forces present or occurring at the vehicle wheels as wheel-individual influencing of wheel contact forces.
  • the wheel contact forces on the two vehicle wheels of the at least one vehicle diagonal are thereby changed in the same direction, that the actuators of these two vehicle wheels are driven accordingly.
  • the actuators, which are assigned to the two vehicle wheels of the other vehicle diagonals, are not activated. For a reduction of Radaufstandskrafte applies accordingly. Alternatively, it is advisable that the actuators of those vehicle wheels, which are assigned to the other vehicle diagonals, are complementarily controlled.
  • the actuators of the two vehicle wheels of the other vehicle diagonals are activated such that the wheel contact forces on these two vehicle wheels are reduced or reduced.
  • the actuators, which are assigned to the two vehicle wheels of the at least one vehicle diagonal are not activated in this case.
  • Radaufstandskrafte applies accordingly.
  • the following procedure is appropriate: The actuators of those vehicle wheels which are assigned to the at least one vehicle diagonal and the actuators of those vehicle wheels which are assigned to the other vehicle diagonals are actuated in opposite directions.
  • the vehicle When cornering, the vehicle has a curve outer and a curve-inner front wheel and a curve outer and a curve-inner rear wheel, wherein each one front wheel and a rear wheel is assigned to one of the two vehicle diagonals.
  • the wheel contact forces on the two vehicle wheels are influenced for at least one of the two vehicle diagonals in accordance with the functional relationship as a function of the curve size.
  • the procedure is such that the respective wheel contact force is lowered both on the outside front wheel and on the inside rear wheel.
  • the respective Radaufstandskraft is increased both on the inside front wheel and on the outside rear wheel. Overall, thus three control variants are possible.
  • a drive is performed only on the outside front wheel and on the inside rear wheel.
  • a control is performed only on the inside front wheel and on the outside rear wheel.
  • the first and the second control variant are combined. If there is a change in the wheel load distribution according to one of these three activation variants, in particular according to the third activation variant, then the instantaneous pole of the vehicle rotational movement is displaced, namely in the direction Turning center. It creates an oversteering Gi9ermomnet. The resulting change in the rotational movement of the vehicle causes a Agiliatssteig réelle and is subjectively perceived by the driver as athletic.
  • the wheel load distribution resulting from the third drive variant will also be referred to as diagonal or criss-cross bracing. In short: The chassis is braced diagonally or crosswise depending on the lateral acceleration.
  • the individual vehicle wheels respectively associated actuators for wheel-individual influence on the respective vehicle wheel RadaufStandskraft be controlled as follows: According to the first control variant, the outside of the front wheel and the inner rear wheel associated actuators are so controlled that at these two vehicle wheels, the respective Radaufstandskraft is lowered. According to the second control variant, the inner front wheel and the outer rear wheel respectively associated actuators are controlled so that the respective Radaufstandskraft is increased at these two vehicle wheels. According to the third control variant, the controls of the first and the second control variant are combined.
  • the wheel contact forces are increased and / or decreased by the same amount for the two vehicle diagonals.
  • increasing and decreasing the wheel contact forces by the same amount has the advantage that the vehicle level remains unchanged despite a change in the wheel load distribution.
  • a change quantity is determined as a function of the curve size, which is a measure of the change in the wheel contact force to be carried out.
  • the amount of change is the value by which the wheel contact force is to be changed.
  • a desired value for the wheel contact force to be set is determined.
  • a value for the wheel contact force to be set is determined on the basis of the respectively existing wheel contact force in order to achieve the desired wheel load distribution. The required to achieve the desired performance of the vehicle wheel load distribution can thus be set exactly.
  • the vehicle wheel is associated with an actuator for wheel-individual influencing of the wheel contact force occurring on this vehicle wheel.
  • a default value for the actuation of the actuator is determined as a function of the setpoint value for the wheel contact force to be set.
  • the default value depending on which variable is detected on the actuator and thus available for setting the required RadaufStandskraft, advantageously to a setpoint for a distance to be set with the actuator, or to a target value for one of the actuator to be set pressure size.
  • the functional relationship is divided into several sections.
  • the value of the change variable can be optimally adjusted to the value of the Adjust curve size.
  • said functional relationship is divided into four sections.
  • the change amount assumes a first value substantially equal to zero. This means that the change quantity assumes either the value zero or a very small value close to zero.
  • the value of the change magnitude increases from the first value to a second value.
  • the transition from the first to the second section is continuous.
  • the function progression is increasing or increasing monotonically.
  • the function history can have a parabolic, increasing course.
  • the value of the change amount decreases from the second value to a third value.
  • the transition between the second and the third section advantageously proceeds continuously.
  • the function is falling or monotone decreasing.
  • the function course can have a parabolic, decreasing course.
  • the value of the change magnitude substantially maintains the third value. This may mean, for example, that the change quantity maintains this value in the sense of a constant. However, this may also mean that the change magnitude decreases to a fourth value starting with the third value, the fourth value being close to zero is equal to or equal to zero. It is also conceivable that the fourth value is negative. As a rule, the third value is greater in amount than the first value.
  • the predetermined driving state or operating state of the vehicle is then reached or occurs when the turning magnitude is greater than a threshold value and at the same time a time decrease of the turning size or another vehicle size, which also represents a cornering, is determined.
  • the time reduction of the curve size is therefore taken into account or recorded or evaluated, since a retraction of the vehicle is to be detected from the curve. In other words, it is to be determined whether the vehicle is cornering in a Kurvenausfahrvorgang or in a turning process or in a return operation or whether such a process occurs.
  • the steering angle set by the driver is evaluated. Also based on this vehicle size can determine whether the vehicle is in one of the above operations.
  • the tension should not be increased, but only reduced.
  • the driver should not notice an increase in the "cornering" of the vehicle, ie when moving out of the curve, the agility of the vehicle should be further increased compared to the driving situation that existed immediately before retiring If the agility of the vehicle is further increased, this would possibly irritate the driver.
  • the threshold value for the curve size is advantageously the value of the curve size in which the change quantity has its vertex according to the functional relationship its absolute maximum or the functional relationship. This ensures that the maximum possible improvement in the agility of the vehicle can be achieved.
  • a modified change quantity is determined as a function of the curve size, which is a measure of the change in the wheel contact force to be carried out.
  • the respective value of the modified change quantity does not or only insignificantly exceeds the value of the change variable which was determined with the aid of the functional relationship when the predefined driving state or operating state of the vehicle occurred or is present.
  • the respectively determined value of the modified amount of change is smaller in absolute value than the value of the amount of change which occurs when the predetermined driving state or operating state of the vehicle with the aid of the functional state occurs Relationship was determined.
  • the modified change quantity is determined by means of the modified functional relationship until the value of the modified change quantity corresponds to a value of the functionally determined change amount determined for a value of the turn size that is smaller than the value of the turn size. which was present at the occurrence or presence of the predetermined driving state or operating state of the vehicle.
  • This measure ensures that the value of the change quantity is determined again with the aid of the functional relationship only when the value of the turn size is smaller than said threshold value at which the change size has its absolute maximum. It is thus avoided a further increase in the agility and the Kurvenwillmaschine the vehicle.
  • the modified functional relationship is a functional relationship that is related to the value of the turn size and the value of the change quantity determined therefor, both at occurrence or presence of the predetermined driving condition or operating condition of the vehicle, to smaller values of the turn magnitude has a monotonically decreasing course. This not only ensures that there is no further increase in the agility of the vehicle. It is also achieved that the agility of the vehicle is reduced, since the vehicle is on exit from a curve.
  • the value of the slope may be set firmly. This makes it possible to realize a time-optimized transition from the functional relationship to the modified functional relationship.
  • the value of the gradient may be determined in accordance with the value of the amount of change that existed when the predetermined driving condition or operating condition of the vehicle occurred or existed. This approach allows optimal adaptation of the transition from the functional relationship to the modified functional relationship and back to the functional relationship. In this approach, the value of the slope can be adjusted to the transitions between the individual functional relationships so that the driver perceives these transients as little as possible or spurt.
  • the influence of the wheel contact forces or the tension or wheel load distribution carried out as a function of the change in size is changed.
  • the presence of a slip value greater than a predetermined threshold may be detected, for example, by means of a flag generated by said slip control system indicating that it is performing driver-independent interventions to control drive slip.
  • This flag is also referred to as the ASR flag since the slip control system is a traction slip control system or a traction control system.
  • the value of the modified amount of change is determined as follows: The value of the amount of change determined by the functional relationship which existed at the occurrence or presence of the predetermined running condition or operating condition of the vehicle is reversed a fixed value or reduced by a value which is determined as a function of said value of the change magnitude. Alternatively, the value of the amount of change determined by the functional relationship which existed when the predetermined running state or operating state of the vehicle was present is reduced until no more than the driving wheel is engaged to control the traction slip. In particular, the latter approach allows optimal adjustment of RadaufStandskraft.
  • the wheel contact force according to the modified change amount is set by the above-described procedure. That at the inside rear wheel, the wheel contact force is set according to the modified change value.
  • driving condition or operating condition of the vehicle Another predetermined to be taken into account driving condition or operating condition of the vehicle is then reached or exists when a brake intervention is performed during cornering.
  • This driving condition will be For the following reason: When braking in a curve, sufficient lateral force must be ensured to prevent the vehicle from breaking out. Consequently, in this driving state or operating state of the vehicle, the tension is reduced or withdrawn. In this driving condition or operating condition of the vehicle, it is irrelevant whether the braking is performed during cornering by the driver or whether it is a driver-independent brake intervention, such as from a
  • Traction control system or a vehicle dynamics control system with the example, the yaw rate of the vehicle is controlled, can be made.
  • the value of the modified amount of change is determined as follows: the value of the amount of change determined by the functional relationship which existed when the predetermined driving condition or operating condition of the vehicle occurs is reduced by a predetermined value or by a value which is Dependence of said value of the change quantity is determined.
  • the vehicle is equipped with a correspondingly equipped device.
  • the vehicle comprises determining means for determining a turning amount representing a present turning of the vehicle, and biasing means for influencing the wheel standing force on at least one vehicle wheel according to a functional relationship depending on the turning amount.
  • the functional relationship is modified, and the influence the wheel contact force is performed according to the modified functional relationship depending on the turning amount.
  • the device is designed to carry out the further method steps described above.
  • this wording expresses that there is a relationship in the mathematical sense between the amount of the curve on the one hand and the wheel contact force to be influenced, for example due to the assignment in sections
  • this formulation can also be so broad that it should not only be understood to mean a relationship in the mathematical sense, but in a very broad sense it should also cover influencing possibilities, for example a change in the laws of determination
  • a change is made directly to the drive amount of the actuator and not to the change amount, that is, bypassing e in modification of the change size.
  • the change amount is converted into a target value for the wheel contact force and the wheel contact force into a command variable for the actuator.
  • the default size is then modified or reduced. This very broad view applies, for example, to the
  • FIG. 1 shows the technical or physical situation on which the method according to the invention or the device according to the invention is based
  • FIG. 2 shows the course of a functional relationship which shows the dependence of a change quantity on a
  • FIG. 3 shows an overview of a vehicle which is equipped with the device according to the invention in which the method according to the invention runs
  • FIG. 4 shows the structure of an inventive device
  • Fig. 5 shows the structure of an inventive
  • Fig. 6 shows the structure of an inventive
  • Fig. 7 shows the structure of an inventive
  • Fig. 8 shows the sequence of running in he inventive device method
  • Fig. 9 the procedure in the determination of
  • FIG. 10 shows the procedure in the diagonal bracing of the chassis in the presence of predetermined
  • the lateral acceleration is a measure or estimate for the slip angle, with the knowledge thus can determine whether the respective vehicle wheel is in the linear or non-linear range. It thus makes sense to use the lateral acceleration as a curve size, in dependence of which, according to a functional relationship, the wheel contact force is influenced on at least one vehicle wheel.
  • a first section for which the turning magnitude ay is smaller than a first threshold ayl, the change magnitude V assumes a first value V1 substantially equal to zero.
  • the chassis should not or only slightly braced, since in this lateral acceleration range no significant effect can be achieved by a distortion of the chassis - this is true in the case of a high coefficient of friction - or a reduction in the Sum of the wheel side forces on an axle should be avoided - this applies to the case of a low coefficient of friction.
  • a second section (labeled 2a in FIG.
  • the value of the change magnitude V increases from the first value V1 to a second value Vs to. That is, to the apex of the functional relationship, which is at ays, the tension of the chassis is increased, ie the increase in Radaufstandskrafte on the curve rear wheel and the inside front wheel and at the same time reducing the Radaufstandskrafte the curve outer front wheel and the inner rear wheel takes up to said vertex in turn, which in turn continuously increases the turnability of the vehicle from the value ayl of the turn magnitude to the value ays of the turn size.
  • a third section (labeled 2b in FIG.
  • deflection point a so-called “deflection point” is marked on the functional connection This deflection point identifies a predetermined driving state or operating state of the vehicle Up to this deflection point, the curve size ay increases continuously, ie the vehicle is turned into a curve and is located then in a cornering (representation "turning into the curve”). When the deflection point is reached, the curve extension process or return movement or deflection process begins. 2, the cornering magnitude decreases and the vertex of the functional relationship has already been exceeded for the deflection point shown in FIGURE 2.
  • the modified functional relationship is used to determine a modified change variable Vm in dependence on the curve size ay, and the influence on the Radaufstandskraft is carried out according to the modified functional relationship as a function of the Kurvenfahrtucc.
  • the modified functional relationship is maintained until the value of the modified amount of change by means of the modified functional Zusamm enhanges is determined as a function of the Kurven researcher constitutes to the value of the change amount, which is determined by means of the functional relationship as a function of the Kurven marsteur.
  • the predetermined driving state or operating state of the vehicle is then reached or occurs when the turning amount ay is greater than a threshold ays and at the same time a decrease in the turning time - the temporal gradient of the turning size is negative - determined becomes.
  • the decrease in another vehicle size which likewise represents a cornering, can also be detected or evaluated.
  • the steering angle set by the driver offers, for example, the steering angle set by the driver.
  • the change magnitude V represents a difference between the wheel contact forces of the two vehicle wheels of a vehicle axle.
  • a change quantity is determined as a function of the curve size.
  • the course of the functional relationship is shown in FIG.
  • Various approaches are conceivable, such as in a control device contained in the vehicle, based on a value of the curve size, the associated value of the change quantity can be determined.
  • a table can be stored, which simulates the course shown in Figure 2, for a plurality of values of the curve size contains the associated value of the change magnitude.
  • FIG. 3 shows in schematic form a vehicle 301 which is equipped with a device according to the invention is equipped, in which the process of the invention proceeds.
  • the vehicle comprises vehicle wheels 302ij, wherein the index i denotes whether it is a front (v) or a rear (h) vehicle wheel and the index j, whether it is a left (1) or around a right vehicle wheel. If this nomenclature is used for other components, it has the same meaning there.
  • the individual vehicle wheels 302ij are each assigned actuators 303ij. These actuators include, as will be explained below, at least means for generating a braking force and means for influencing the wheel contact force.
  • the vehicle 301 contains a control device 304 with which drive variables or control signals for the actuators 303 ij and a block 305 are generated.
  • the block 305 is intended to comprise an engine arranged in the vehicle together with influencing means with which the engine torque output by this engine can be influenced.
  • the control device 304 can also be supplied with quantities from the actuators 303 ij and the block 305 for processing.
  • the device according to the invention is composed of the control device 304 and at least part of the actuators 303ij. It should be noted at this point that the use of the designation control device should not have any restrictive effect with regard to the generation of the control variables or control signals output by the control device. These quantities or signals can be generated as part of a closed-loop control or as part of a controller.
  • FIG. 4 shows the structure of the control device 304 according to the invention according to a first embodiment.
  • the control device 304 comprises a block 401, which is a vehicle dynamics controller.
  • this Vehicle dynamics controller 401 are supplied with various sensor signals starting from a block 402, which comprises various sensor means contained in the vehicle. As a function of these sensor signals, control variables or control signals for actuating actuators contained in the vehicle are generated in vehicle dynamics controller 401. These actuators are shown in Figure 4 by the blocks 305 and 408ij.
  • the vehicle dynamics controller 401 includes various functionalities.
  • the driving dynamics controller 401 includes the functionality of a brake slip controller with which the brake slip occurring at the vehicle wheels 302ij during a braking operation is regulated.
  • the vehicle dynamics controller 401 is supplied with wheel speed quantities representing the wheel speeds present at the individual vehicle wheels 302 ij, starting from the block 402 which includes wheel speed sensors assigned to the individual vehicle wheels 302 ij.
  • driving variables or control signals are determined in the driving dynamics controller 401 from these wheel speed variables, which are supplied to the individual brake actuators 408ij, which are assigned to the respective vehicle wheels 302ij, for regulating the brake slip.
  • the driving dynamics controller 401 also includes the functionality of a traction control with which the on the vehicle wheels during a
  • the driving dynamics controller 401 is supplied with corresponding sensor signals starting from the block 402. These sensor signals are said wheel speed magnitudes and an engine speed magnitude provided by a sensor for detecting the speed of the vehicle engine included in block 305. In known manner are in the vehicle dynamics controller 401 from generates control signals to these signals which are supplied to the brake actuators 408ij and the traction control block 305. In block 305, the influencing means for reducing the engine torque output by the vehicle engine are actuated by the control variables or control signals.
  • vehicle dynamics controller 401 also generates control variables or control signals for the brake actuators 408ij and the control block 305
  • the vehicle dynamics controller 401 generates control variables or control signals for the brake actuators 408ij for carrying out wheel-individual driver-independent braking interventions with which a yawing moment acting on the vehicle can be generated. If necessary, driving dynamics controller 401 also generates control variables or control signals, which are supplied to block 305, and by means of which the influencing means for reducing the engine torque output by the vehicle engine are actuated.
  • block 401 starting from block 402, receives a lateral acceleration magnitude, a steering angle magnitude, wheel speed magnitudes, and a blank size representative of the brake pressure set by the driver.
  • block 402 includes corresponding sensor means.
  • the vehicle dynamics controller 401 In order to be able to generate the drive variables or control signals described above for controlling the yaw angular velocity, the vehicle dynamics controller 401 still needs information which characterizes a deviation which optionally exists between an actual value determined for the yaw angular velocity and a nominal value prescribed for this purpose. This information is the vehicle dynamics controller 401 from a block 403, which is a Yaw angular velocity controller is supplied. In order to provide this information, a yaw angular velocity magnitude, a steering angle magnitude and wheel speed magnitudes are supplied to block 403 from block 402, which includes corresponding sensor means. With the aid of a mathematical model, in block 403, the steering angle becomes large, depending on the steering angle
  • Vehicle speed magnitude which is determined in block 403 based on the wheel speed variables, a setpoint for the yaw rate detected.
  • An optional deviation between the actual value and the desired value for the yaw angular velocity is determined, for example, by subtraction.
  • the differential size obtained can be fed to block 401.
  • a deviation present for the yaw angular velocity between the actual value and the desired value is converted in block 403 into nominal slip quantity for the individual vehicle wheels 302 ij, and these are then fed to the block 401.
  • a lateral acceleration quantity is supplied to a block 404.
  • a magnitude of change V is determined in accordance with the functional relationship illustrated in FIG. 2, in dependence on the lateral acceleration magnitude, which is the turning magnitude, and the time derivative of the lateral acceleration magnitude.
  • setpoint values Fnsollij for the wheel contact forces to be set for the individual vehicle wheels 302i] are determined in the block 405. These setpoints are fed to a block 407, which is a suspension controller.
  • the dashed representation used in this context in Figure 4 will be discussed below.
  • the actual values Fnistij of the wheel contact forces required in the block 405 are supplied to the block 405 on the basis of the chassis controller 407.
  • the actual values of the wheel contact forces are determined in the chassis controller 407, for example, as a function of the variables supplied to it using suitable models.
  • the chassis controller 407 is part of an active suspension system contained in the vehicle, which in addition to the chassis controller 407 as further components corresponding sensor means to be encompassed by the block 402, and the individual vehicle wheels 302ij associated actuators 409ij for wheel-individual influence on the respective vehicle 302 302ij contains occurring RadaufStandskraft.
  • the active suspension system controls the movements of the body of the vehicle 301 by means of additional wheel contact forces generated on the individual vehicle wheels 302ij by means of the actuators 409ij.
  • the actuators 409ij are active struts assigned to the respective vehicle wheels 302ij, in which spring and shock absorbers are connected in parallel, for example.
  • the coil spring is supported toward the vehicle wheel 302ij on a spring plate fixedly connected to the shock absorber tube and toward the vehicle body on a spring plate which is connected to a single-acting hydraulic cylinder.
  • By hydraulic control of this hydraulic cylinder or adjusting this is moved and thus increases or decreases the bias of the coil spring.
  • the wheel contact force can be influenced on the respective vehicle wheel 302ij.
  • the active struts may also be designed as so-called hydropneumatic springs.
  • the actuators 409ij are actuated by corresponding actuation variables or control signals as a function of the current state of the vehicle 301.
  • the chassis controller 407 receives the current state of the vehicle 301 via sensor signals that are supplied to it from the block 402. These sensor signals are sensor signals that represent the state of movement of the structure of the vehicle 301, sensor signals representing the current vehicle level with respect to the roadway, and sensor signals representing the respective current actuation states of the active struts, more precisely the respective current position of the vehicle Represent adjustment cylinder.
  • the sensor signals representing the state of motion of the structure of the vehicle 301 are, for example, three vertical acceleration quantities describing the vertical acceleration present at three different locations of the vehicle body
  • a lateral acceleration quantity which describes the lateral forces acting on the vehicle and a longitudinal acceleration quantity which describes the acceleration or deceleration of the vehicle are determined by corresponding ones arranged on the vehicle 301
  • the sensor signals which represent the current vehicle level with respect to the road surface, are aided by the individual vehicle wheels 302ij assigned level sensors detected. With the aid of these level sensors, the respective relative distance between the vehicle body and the wheel center is detected. The vehicle level can then be determined from the relative paths detected for the vehicle wheels 302 ij.
  • the sensor signals representing the respective current states of actuation of the active struts are, for example, magnitudes provided by displacement sensors which detect the displacement of the adjusting cylinder or by magnitudes provided by pressure sensors that correspond to those in the adjusting cylinder detect adjusted hydraulic pressure.
  • Block 402 is intended to include the aforesaid sensor means associated with the active suspension system.
  • the control variables or control signals output by the chassis controller 407 to the actuators 409ij represent the adjustment path or the hydraulic pressure, depending on which variable of the adjusting cylinder is influenced according to the control concept implemented in the chassis controller 407.
  • the active suspension system compensates for dynamic body movements such as lifting movements, pitching movements or rolling movements.
  • the active suspension system allows a load-dependent level control on the front and on the rear axle.
  • different algorithms are implemented in the chassis controller 407.
  • a so-called skyhook algorithm minimizes the absolute acceleration value of the body of the vehicle 301 irrespective of the lane excitation from the three vertical acceleration magnitudes.
  • An actacon algo- rithm processes the relative paths between the vehicle body and the individual vehicle wheels 302i. A comparison between the actual value and the reference value for the relative distance makes it possible to bring the vehicle to a certain level or to keep it there. At the same time that will Suspension behavior of the vehicle 301 influenced.
  • the setpoint values Fnsollij for the wheel contact forces supplied by the block 405 can, for example, enter the Aktakon algorithm or the lateral acceleration upshift and are thus taken into account in the control of the actuators 409ij.
  • target values for the wheel contact forces are only determined by the block 405, which are then supplied to the chassis controller 407.
  • setpoint values Fnsollij for the wheel contact forces can also be determined by block 401 and / or block 403.
  • the wheel lift forces setpoint values Fnsollij determined by the block 405 and the blocks 401 and / or 403 are not supplied directly to the chassis controller 407 but to a block 406.
  • Block 406 is a coordinator.
  • the coordination means combines the setpoint values Fnsollij for the wheel contact forces generated by the blocks 401, 403 and 405 into a uniform desired value for the respective vehicle wheels 302ij. This can be done, for example, by a weighted addition, a prioritized selection, or by other suitable procedures.
  • the determination of target values Fnsollij for the wheel contact forces expire:
  • the deviation between the actual value and the desired value present for the yaw angular velocity is converted into said nominal values. If an overdriving driving behavior of the vehicle is to be compensated, then the setpoint values for the wheel contact forces must be set so that the resulting wheel load at the rear axle is greater than the resulting wheel load at the front axle. If an understeering driving behavior of the vehicle is to be compensated, then the setpoint values for the wheel contact forces must be set so that the resulting wheel load at the front axle is greater than the resulting wheel load at the rear axle.
  • V or the present or made diagonal bracing of the chassis should be possible.
  • a present diagonal bracing of the chassis there is a non-zero value for the change in size
  • V before determines whether there is oversteer or understeer the vehicle.
  • the setpoint value for the yaw rate is increased.
  • Understeering driving behavior reduces the yaw angular velocity setpoint.
  • the correction of the target value for the yaw rate is made for the following reason or is necessary for the following reason:
  • the diagonal bracing of the chassis and the concomitant influence on the steering behavior of the vehicle leads to an influence on the driving behavior of the vehicle, which in determining the setpoint for the yaw rate as a function of Vehicle speed and steering angle is not taken into account - the diagonal bracing of the chassis is detected neither by the vehicle speed nor by the steering angle.
  • the yaw angle velocity controller 403 would detect an oversteering drivability of the vehicle, for which reason the vehicle dynamics controller 401 would make brake interventions that was supposed to lift this supposed oversteer driving behavior. Since this is caused by the diagonal bracing of the chassis oversteer driving the vehicle is desired, the target value for the yaw rate is increased accordingly, the yaw rate controller 403 thus detects a neutral handling of the vehicle and there are no stabilizing braking interventions performed - the handling of the vehicle caused by the diagonal bracing of the chassis should be, can thus be adjusted. Whether an oversteering or an understeering driving behavior of the vehicle is present in the
  • Yaw angular velocity controller 403 based on a deviation between the actual value and the setpoint of
  • Yaw rate can be determined. If the actual value is greater than the setpoint, then oversteer is present. If the actual value is smaller than the setpoint, then understeer is present
  • a second reason for this exchange is that the possibility of being influenced by the
  • Gierwinkel horridas 403 on the running in block 405 determination of the wheel load distribution or on the running in block 405 determination of the change variable V is to exist.
  • This possibility of exerting influence may be necessary, for example, for the following reason:
  • the diagonal bracing of the chassis according to the invention when cornering, leads to a desired oversteering driving behavior of the vehicle. As long as this oversteer moves within certain limits, this is perceived by the driver as positive, since the vehicle behaves more agile and shows a more pronounced cornering ability. However, if this oversteer exceeds certain limits, the driver will no longer feel comfortable. In this case, the value of the change quantity V determined in the block 405 is reduced, or the change amount V determined in the block 405 may be replaced by a change amount determined in the block 403. The influence described above by the
  • Yaw angular velocity controller 403 on block 405 is particularly important in the case where yaw rate controller 403 does not output setpoint values Fnsollij for the wheel contact forces. Too much oversteer can be the yaw angular velocity controller 403 by evaluating the deviation between the actual value and the Determine the yaw angular velocity setpoint. Override occurs when the actual value is greater than the setpoint. If this deviation is greater than a predefined threshold value, then the yaw rate controller 403 takes appropriate measures according to the above statements.
  • block 405 can be supplied with the following variables from block 401: an ASR flag which indicates that control variables or control signals for carrying out stabilizing interventions for regulating traction slip are output by vehicle dynamics controller 401.
  • the ASR flag thus indicates that the vehicle dynamics controller 401 is active in accordance with the functionality of a traction control controller.
  • a flag indicating that there is a cornering brake. This flag is generated when, for example, the turning amount has a value other than zero and at the same time an operation of the brake pedal, i. a brake carried out by the driver is present or a driver-independent performed brake intervention is made.
  • a flag indicating that there is a so-called ⁇ -split braking that is, a braking made by the driver while the vehicle is moving on a road having different coefficients of friction for the left and right vehicle sides.
  • Outsourcing the determination of the change magnitude V to a discrete block 405 has the advantage that the diagonal tension of the landing gear can be defined without substantially altering existing controls, such as the yaw rate controller 403, the Driving dynamics controller 401 or the chassis controller 407 must be made.
  • actuators 408ij and 409ij are the actuators which are designated 303ij in FIG.
  • Figure 5 shows the structure of the control device 304 according to the invention according to a second embodiment.
  • the two separate blocks 401 and 403 contained in FIG. 4 ie the yaw angular velocity controller and the vehicle dynamics controller, are combined to form a functional unit 501.
  • block 501 is supplied with the quantities which, according to FIG. 4, are supplied from block 402 to the two blocks 401 and 403.
  • the exchange taking place between the two blocks 405 and 501 comprises the exchange which according to FIG. 4 takes place between the two blocks 403 and 405 on the one hand and between the two blocks 401 and 405 on the other hand.
  • the quantities are supplied to block 406 which, according to FIG.
  • FIG. 4 is supplied from block 401 to block 406 and from block 403 to block 406.
  • the blocks 402, 404, 405, 406, 407, 408ij, 305 and 409ij contained in FIG. 5 correspond to those shown in FIG. Accordingly, the sizes shown in FIG. 5 are also supplied with the variables, as can be seen from the description of FIG. 4, and / or these blocks shown in FIG. 5 likewise display the variables, as can be seen from the description of FIG. Figure 6 shows the structure of the control device 304 according to the invention according to a third embodiment.
  • the yaw angular velocity controller 602 and the vehicle dynamics controller 601 are configured as independent functional units, as is the case with the embodiment shown in FIG.
  • the function of the block 405-and with it also the function of the block 404- is integrated in the yaw rate controller 602 or in the vehicle dynamics controller 601.
  • block 602 is fed the quantities shown in FIG. 4 from block 402 to blocks 403 and 404 be supplied.
  • this replacement comprises the exchange which, according to FIG. 4, takes place, on the one hand, between the blocks 401 and 403 and, on the other hand, between the two blocks 401 and 405.
  • the blocks 601 are supplied with the quantities which, according to the description of FIG. 4, are supplied from the block 402 to the block 401.
  • the setpoint values Fnsollij for the wheel contact forces determined in the block 602 are supplied to the chassis controller 407.
  • setpoint values Fnsollij for the wheel contact forces are also determined by the block 601. In this case will be the respectively determined setpoint values are not fed directly to the chassis controller 407 but to the block 406, in which the setpoint values, as can be seen from the description of FIG. 4, are combined to form a uniform setpoint value.
  • the blocks 601 are fed with the variables shown in FIG. 4 from block 402 to the two blocks 401 and 404 be supplied.
  • this exchange comprises the exchange which, according to FIG. 4, takes place on the one hand between the blocks 401 and 403 and on the other hand between the two blocks 403 and 405.
  • the blocks 602 are supplied with the variables which, according to the description of FIG. 4, are supplied from the block 402 to the block 403.
  • the setpoint values Fnsollij for the wheel contact forces determined in the block 601 are supplied to the chassis controller 407.
  • setpoint values Fnsollij for the wheel contact forces are also determined by the block 602.
  • the respectively determined setpoint values are not fed directly to the chassis controller 407 but to the block 406 in which the setpoint values, as can be gathered from the description for FIG. 4, are combined to form a uniform setpoint value.
  • the blocks 402, 406, 407, 408ij, 305 and 409ij contained in FIG. 6 correspond to those shown in FIG. As a result, these blocks shown in FIG. 6 become also supplied the sizes, as can be seen from the description of Figure 4, and / or give these blocks shown in Figure 6 also the sizes, as can be seen from the description of Figure 4.
  • Figure 7 shows the structure of the control device 304 according to the invention according to a fourth embodiment.
  • the two separate blocks 401 and 403 contained in FIG. 4 ie the yaw angular velocity controller and the vehicle dynamics controller, are combined to form a functional unit 701, into which the functions of the blocks 404 and 405 illustrated in FIG. 4 are integrated.
  • the blocks 701 are supplied with the quantities which, according to FIG. 4, are supplied from the block 402 to the blocks 401, 403 and 404.
  • the set values Fnsollij for the wheel contact forces determined in the block 701 are supplied to the chassis controller 407.
  • the blocks 402, 407, 408ij, 305 and 409ij contained in FIG. 7 correspond to those shown in FIG. Accordingly, the sizes shown in FIG. 7 are likewise supplied to the blocks, as can be seen from the description of FIG. 4, and / or these blocks shown in FIG. 7 also output the variables, as can be seen from the description of FIG.
  • FIG. 8 shows the sequence of the method according to the invention running in the device according to the invention with the aid of a flow chart.
  • the method according to the invention begins with a step 801, which is followed by a step 802.
  • this step 802 it is checked whether an abort criterion is met. For this purpose, it can be checked whether, for example, in one of the controller, ie the yaw rate controller or the Driving dynamics controller or the chassis controller, an error occurs, or if a Fahler occurs at another component involved. If it is determined in the step that the termination criterion has been met, then a step 803 is executed and then the inventive method is terminated with a step 904.
  • step 803 at least the actuators 409 ij associated with the individual vehicle wheels 302 ij, with which the wheel contact force F n ij occurring at the respective vehicle wheel 302 ij can be influenced in a wheel-specific manner, are converted into a defined state.
  • step 805 is subsequently executed following step 802.
  • various magnitudes needed to determine the change magnitude V are provided, including the turn magnitude, which is a magnitude describing lateral acceleration, and the time derivative of the turn magnitude.
  • step 806 subsequent to the step 805 a value for the change amount V is obtained. The concrete procedure here will be discussed in connection with FIG. The step 806 is followed by a step 807 in which, depending on the value of the changeover large set values Fnsollij for the wheel contact forces are determined.
  • step 808 If setpoint values Fnsollij for the wheel contact forces are determined by a plurality of controllers contained in the vehicle, these are combined in a step 808 which follows step 807 to form a uniform setpoint value for the respective vehicle wheels 302ij. Subsequent to step 808, a step 809 is performed. Step 808 is required only when setpoints are applied by various controllers included in the vehicle Fnsollij be determined for the RadaufStands mechanism. If such setpoints are only determined by a controller, then the implementation of step 808 is not necessary. In this case, step 807 is followed directly by step 809. The optional embodiment of step 808 described above is indicated in FIG. 8 by the dashed representation.
  • step 809 setpoint values Fnsollij determined for the individual vehicle wheels 302ij for the wheel contact forces to be set are determined in setpoint values for the adjustment path or hydraulic pressure to be set at the respective actuator 409ij.
  • step 810 subsequent to step 809, the required wheel contact forces on the individual vehicle wheels 302 ij are adjusted by influencing or adjusting the adjustment path or hydraulic pressure by a corresponding activation of the actuators 409 ij. Subsequent to step 810, step 802 is executed again.
  • FIG. 9 shows the determination of the change variable taking place in step 806 or the routine for determining the change variable that runs in step 806.
  • This routine is passed from step 805, followed by step 901.
  • step 901 it is checked whether the value of the turning amount ay is smaller than a first threshold ayl. If the value of the turning amount ay is smaller than the first threshold value ayl, then no diagonal tensioning of the landing gear is made, and therefore, following the step 901, a step 902 is executed in which the change amount V is assigned a first value V1. Step 902 is followed by step 807, via which the change size determination routine is exited.
  • step 903 it is first checked whether a flag is set, which indicates that a diagonal bracing of the chassis is already performed according to the modified functional relationship. If the flag is not set, then following step 903, step 904 is executed. In the step
  • step 904 a value for the amount of change V is determined according to the functional relationship depending on the value of the turning amount ay. That a diagonal bracing of the chassis is carried out according to the functional relationship.
  • step 904 is followed by a step 905.
  • step 905 it is checked if the value of the turn amount ay is smaller than a second threshold ays. In this second threshold, the course of the functional relationship has its vertex or its absolute maximum. If it is determined in step 905 that the value of the turn amount ay is smaller than the second threshold ays, no modification of the functional relationship is required, and therefore, from step 905, it is passed to step 807. If, on the other hand, it is determined in step 905 that the value of the turning amount ay is larger than the second threshold ays, subsequent to step
  • step 906 it is determined whether the driver is returning from the curve or whether the driver is turning back the steering wheel, ie, whether there is a curve extension operation or a deflection process or whether the deflection point has been reached. This can be done, for example, by evaluating the time derivative of the curve size or by evaluating the time derivative of the amount of the Kurven marsgrße be determined. If a negative value for the time derivative is detected, then there is a deflection, the driver steers back from the curve, so a modification of the functional relationship is required. Therefore, if there is a negative derivative for the turn magnitude, then step 906 is followed by step 908.
  • step 908 on the one hand, the flag is set, which indicates that a diagonal tensioning of the chassis is performed according to the modified functional relationship.
  • a value for a modified change quantity Vm is determined in step 908 with the aid of the modified functional relationship as a function of the value of the curve size ayy. This means that a diagonal bracing of the chassis is carried out or carried out according to the modified functional relationship.
  • step 807 is performed. If, on the other hand, in step 906 that the driver does not yet return from the curve, ie that the deflection point has not yet been reached, then it is also not necessary to carry out the diagonal bracing of the chassis according to the modified functional relationship.
  • step 906 step 807 is performed.
  • step 907 it is checked whether the value of the modified change amount determined by the modified functional relationship corresponds to the value of the change amount determined by the functional relationship for the same value of the turn size for which the value of the modified value Change size was determined. If the two values do not match, then step 908 is followed by step 907. It is also made a diagonal bracing of the chassis according to the modified functional relationship.
  • step 909 is performed following step 907. Now that the performance of a diagonal bracing of the chassis according to the modified functional relationship is no longer required, in step 909 said flag is deleted. Subsequent to step 909, step 807 is performed.
  • this is ascertained when two or more steps 905 and 906 are present or when a predetermined driving state or operating state of the vehicle is present.
  • FIG. 10 shows the procedure for the diagonal bracing of the chassis in the presence of predetermined driving states or operating states of the vehicle.
  • the considered predetermined driving states or operating states are, on the one hand, a cornering in which control of the traction slip is performed on at least one drive wheel. On the other hand, it is a cornering, in which at least one vehicle wheel, a brake intervention is performed.
  • step 1002 it is checked whether the value of the turning amount ay is smaller than a first threshold ayl. If the value of the curve size ay is less than the first threshold value ayl, then no diagonal bracing of the landing gear is made, which is why Following step 1002, a step 1003 is performed, in which the change amount V is assigned a first value V1. The step 1003 is followed by a step 1006 with which the method is terminated.
  • step 1004 it is checked whether a flag indicating the execution of traction control on at least one vehicle wheel is set, or whether a flag is set indicating an operation of the brake pedal by the driver and thus the execution of a driver-dependent braking operation. If there is no such flag, then there is no need to make a diagonal bracing of the chassis according to a modified functional relationship.
  • step 1005 is performed, with which measures are carried out for carrying out a diagonal bracing of the chassis according to the functional relationship.
  • step 1006 is executed to terminate the method. If, on the other hand, it is determined in step 1004 that one of the above-mentioned flags is set, then there is a need to perform a diagonal bracing of the chassis according to a modified functional relationship. Therefore, subsequent to step 1004, a step 1007 is performed.
  • step 1004 it is determined by evaluation of the flags that, during cornering, control of the traction slip is performed on at least one drive wheel, then a functional relationship specially adapted to this driving situation is selected, and the diagonal one Bracing the chassis performed according to this context.
  • the tension on the drive wheel, on which the drive slip is regulated is withdrawn, ie canceled, or else reduced.
  • corresponding setpoint values are determined for the wheel contact force to be set on this drive wheel. The withdrawal of the tension can be done for example by means of a time ramp.
  • step 1004 If, in step 1004, it is determined by evaluation of the flags that a braking intervention is performed during cornering, then a functional relationship specially adapted to this driving situation is selected, and the diagonal bracing of the chassis is carried out in accordance with this relationship. According to the modified functional relationship, the stress is reduced or decreased. This can be the case for individual vehicle wheels or for all vehicle wheels. Subsequent to step 1007, a step 1006 is performed.
  • ⁇ -split braking is a driver-driven braking operation in which the vehicle travels on a road surface that has different coefficients of friction for the left and right sides of the vehicle. In such braking, different braking forces are generated on the left and right wheels of the vehicle, which cause the vehicle to turn about its vertical axis, in the direction of Road side, which has the higher coefficient of friction. If the vehicle is equipped with an active suspension system, then in the presence of ⁇ -split braking, a diagonal bracing of the chassis can be made to counteract the rotational movement - at least initially -.
  • the procedure is as follows: First, the RadaufStandskraft the front vehicle, which is located on the road side with the higher coefficient of friction, increased by the toe of the vehicle wheel of the rotation of the vehicle to counteract its vertical axis. At the same time, the wheel contact force is also increased due to the diagonal tension on the rear vehicle wheel, which is on the road side with the lower coefficient of friction. Since the diagonal bracing at the same time relieves the important for directional stability rear wheel, which is located on the side of the road with the higher coefficient of friction, this diagonal bracing can be maintained only at the beginning of the braking process. After a certain period of time, therefore, the wheel contact force on the rear vehicle wheel, which is located on the road side with the higher coefficient of friction, is increased. Again, the suspension is braced diagonally.
  • the described diagonal bracing of the chassis to compensate for the rotational movement of the vehicle about its vertical axis, which occurs in a ⁇ -split braking, does not necessarily have or include all the technical aspects that have been described in connection with Figures 1 to 10 above , If it makes sense technically, for example, because appropriate technical aspects are used or represent an advantageous development, the diagonal bracing of the chassis described here is to compensate for the Rotary movement of the vehicle about its vertical axis with just these technical aspects in any way be combined.
  • setpoint values for the wheel contact force changes can also be predefined.
  • the block 402 does not necessarily have to be designed as a vehicle dynamics controller. It would also be sufficient if block 402 alone had the functionality of a traction controller.
  • Outsourcing the determination of the amount of change V to an independent block 405 has the advantage that the diagonal tension of the landing gear can be defined without having to make fundamental changes to existing controls, such as the yaw rate controller 403, the vehicle dynamics controller 401 or the chassis controller 407 ,
  • a ⁇ -split braking can be detected, for example, based on the curves of the brake pressures of the left and right vehicle wheels.
  • a ⁇ -split braking can also be detected by the vehicle making a rotational movement about its vertical axis, although the driver does not operate the steering wheel and at the same time there is a signal representing an actuation of the brake pedal by the driver.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)

Abstract

La présente invention concerne un système et un dispositif permettant d'influencer le comportement routier d'un véhicule automobile.
EP07723740A 2006-04-13 2007-03-29 Système destiné à influencer le comportement routier d'un véhicule automobile Withdrawn EP2004427A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006017823A DE102006017823A1 (de) 2006-04-13 2006-04-13 System zur Beeinflussung des Fahrverhaltens eines Fahrzeuges
PCT/EP2007/002796 WO2007118587A2 (fr) 2006-04-13 2007-03-29 Système destiné à influencer le comportement routier d'un véhicule automobile

Publications (1)

Publication Number Publication Date
EP2004427A2 true EP2004427A2 (fr) 2008-12-24

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Application Number Title Priority Date Filing Date
EP07723740A Withdrawn EP2004427A2 (fr) 2006-04-13 2007-03-29 Système destiné à influencer le comportement routier d'un véhicule automobile

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US (1) US20100010710A1 (fr)
EP (1) EP2004427A2 (fr)
DE (1) DE102006017823A1 (fr)
WO (1) WO2007118587A2 (fr)

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DE102006017823A1 (de) 2007-10-18
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