EP1399345A1 - Procede de regulation de la stabilite de conduite - Google Patents

Procede de regulation de la stabilite de conduite

Info

Publication number
EP1399345A1
EP1399345A1 EP02748754A EP02748754A EP1399345A1 EP 1399345 A1 EP1399345 A1 EP 1399345A1 EP 02748754 A EP02748754 A EP 02748754A EP 02748754 A EP02748754 A EP 02748754A EP 1399345 A1 EP1399345 A1 EP 1399345A1
Authority
EP
European Patent Office
Prior art keywords
esp
front wheel
limit value
esp intervention
model
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Withdrawn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
EP02748754A
Other languages
German (de)
English (en)
Inventor
Volker Bremeier
Thorsten WICKENHÖFER
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.)
Continental Teves AG and Co OHG
Original Assignee
Continental Teves AG and Co OHG
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 Continental Teves AG and Co OHG filed Critical Continental Teves AG and Co OHG
Publication of EP1399345A1 publication Critical patent/EP1399345A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B60T8/1755—Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve
    • 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
    • B60T2270/00—Further aspects of brake control systems not otherwise provided for
    • B60T2270/86—Optimizing braking by using ESP vehicle or tire model

Definitions

  • the invention relates to a method for controlling driving stability, in which pressures for the individual brakes are determined on the basis of a plurality of input variables, so that the driving stability of the vehicle is increased by an ESP intervention.
  • driving stability control combines four principles for influencing the driving behavior of a vehicle by means of predeterminable pressures or braking forces in or on individual wheel brakes and by intervening in the engine management of the drive motor. These are brake slip control (ABS), which is intended to prevent individual wheels from locking during braking, traction control (ASR), which prevents the driven wheels from spinning, and electronic braking force distribution (EBV), which determines the ratio of braking forces between the front and rear axle of the vehicle and a yaw moment control (ESP), which ensures stable driving conditions when yawing the vehicle around the vertical axis.
  • ABS brake slip control
  • ASR traction control
  • EBV electronic braking force distribution
  • ESP yaw moment control
  • a vehicle is a motor vehicle with four wheels, which is equipped with a hydraulic, electro-hydraulic or electro-mechanical brake system.
  • the driver can apply braking pressure using a pedal-operated master cylinder be built up while the electro-hydraulic and electro-mechanical brake systems build up a braking force dependent on the sensed driver braking request.
  • a hydraulic brake system Each wheel has a brake, which is assigned an inlet valve and an outlet valve.
  • the wheel brakes are connected to the master cylinder via the inlet valves, while the outlet valves lead to an unpressurized container or low-pressure accumulator.
  • there is an auxiliary pressure source which is able to build up pressure in the wheel brakes regardless of the position of the brake pedal.
  • the inlet and outlet valves can be actuated electromagnetically for pressure control in the wheel brakes.
  • the pressure sensor can also be replaced by a pedal travel or pedal force meter if the auxiliary pressure source is arranged in such a way that a brake pressure built up by the driver cannot be distinguished from that of the auxiliary pressure source.
  • a critical situation is an unstable driving condition in which, in extreme cases, the vehicle does not follow the driver's instructions.
  • the function of the driving stability control therefore consists in giving the vehicle the vehicle behavior desired by the driver within the physical limits in such situations.
  • An unstable driving behavior of a vehicle can occur in the case of understeer, in which the measured yaw rate in the manner of deviates from that to be achieved that the vehicle does not turn into the curve as much as expected.
  • An ESP understeering intervention in this case with braking of the rear wheel on the inside of the curve has no effect, in particular in the case of bends driven steadily with a strong understeering tendency and high level of lateral acceleration in vehicles with a high tendency to roll or in certain rear axle constructions (for example torsion beam linkage), since in these driving situations it takes off rear wheel comes inside.
  • an ESP understeer intervention has only a limited effect due to the normal force reduction on the inside of the vehicle on the curve in particularly heavy vehicles. Understeering driving situations of this type arise when the driver specifies or has to specify a steering angle T due to the course of the curve in the case of high-friction conditions, which the vehicle cannot follow at the current speed.
  • the actual reason for the understeering instability recognized by the ESP control in such situations is therefore a vehicle speed which is not adapted to the course of the curve and the high level of lateral acceleration caused by it. Due to the ESP understeer intervention on the inside rear wheel, the instability of the vehicle cannot be reduced or can only be reduced to a limited extent by the introduction of a yaw moment about the vertical axis of the vehicle. A reduction in the understeer tendency is only achieved when a braking effect of the understeer intervention can be achieved or increased.
  • the ESP understeer intervention is also important for vehicles with a high installation center of gravity (e.g. off-road vehicles).
  • the normal force of the wheels on the inside of the curve is reduced so much due to the high lateral accelerations under the boundary conditions mentioned, so that the build-up braking forces are not even one Allow stabilizing build-up of a yaw moment. Since the vehicle speed is reduced only to a small extent, the instability of these vehicles also increases due to the unlimited lateral acceleration level.
  • a reduction in the normal force level which further reduces the effect of the ESP understeering intervention, can also be brought about by shifting the center of gravity towards the front axle (eg vehicles with front-wheel drive and at the same time having a low overall mass).
  • the invention has for its object to provide a modification of the ESP driving stability control that effectively prevents understeering.
  • this object is achieved in that a generic method is carried out in such a way that when cornering with understeering driving behavior it is determined whether a force transmission between the tire and road surface of the vehicle in correlation to a limit value G Scr ⁇ during ESP intervention on the inside rear wheel of the curve iupf is present, and when the limit value is reached or exceeded, the ESP intervention takes place in addition to the inside rear wheel on the inside front wheel.
  • the ESP understeer intervention is modified in such a way that, in addition to braking the rear wheel on the inside of the curve, a suitable braking pressure in the ABS control range is also introduced into the front wheel on the inside of the curve.
  • a suitable braking pressure in the ABS control range is also introduced into the front wheel on the inside of the curve.
  • the loss of cornering force thus counteracts the build-up of a yaw moment counteracting the understeering of the vehicle.
  • the torque caused by the lateral force reduction around the vertical axis of the vehicle increases with increasing longitudinal slip.
  • a maximum longitudinal force that can be transmitted between the tire and the road surface results in accordance with the ⁇ slip curve at approx. 15% longitudinal slip, this corresponds to the control range of the ABS.
  • the loss of lateral force is still relatively small.
  • the method according to the invention therefore generates a torque around the vertical axis against the understeering curve path of the vehicle on the inside of the front wheel on the sum of longitudinal and lateral forces.
  • the method enables vehicle stabilization in the event of understeer or its improvement, in particular for vehicles with a twist-beam axle (rigid axle) but also for vehicles with a high weight, for which braking alone on the inside rear wheel is not sufficient.
  • understeering can be effectively prevented by the special ESP intervention.
  • the ESP intervention takes place on the front wheel on the inside of the curve when the limit value Gs c hiupf has reached or exceeded a slip value ⁇ ⁇ 0% to 20%.
  • the ESP intervention on the front wheel on the inside of the curve is advantageous if the limit value G Sc hi u p f has reached or exceeded a slip value ⁇ of between 10% and 20%, since in this case the longitudinal force build-up on the rear wheel on the inside of the curve is exhausted during dynamic understeer intervention.
  • ESP understeer intervention with braking only the inside rear wheel has no effect when driving through corners with strong understeering tendency and a high level of lateral acceleration in vehicles with high roll tendency or with certain rear axle constructions (e.g. twist beam axle), because in these driving situations it takes off the inside rear wheel comes.
  • an ESP understeer intervention on the inside rear wheel has only a limited effect due to the normal force reduction on the inside side of the vehicle in vehicles with a high total weight.
  • the ESP intervention on the front wheel on the inside of the curve can therefore also take place in that the limit value G SC hiupf is set to a slip value ⁇ of 0%, so that braking pressure is applied to the two wheels on the inside of the curve with each ESP understeering intervention. This advantageously achieves a greater total torque about the vertical axis of the vehicle with an increased reduction in the longitudinal speed.
  • the transverse acceleration of the vehicle is advantageously considered such that the transverse acceleration on the front wheels is detected during the ESP intervention on the inside rear wheel and / or front wheel and compared with a limit value GQ Uer / top / bottom .
  • the deviation of the lateral acceleration from the limit value GQ U erobenun te n during the ESP intervention is determined and the dynamics of the driving maneuver are evaluated in correlation with the slip value. With high slip values and low lateral acceleration, low friction values between the tire and the road can be inferred.
  • a vehicle-specific upper limit value G Que r / top is defined, which occurs when the control of the front wheel on the inside of the curve occurs when it is reached or falling below a lower limit value G Quer / url th.
  • the limit value G Que r / und te n can be between 1m / s 2 and 3m / s 2 , preferably 2m / s 2 .
  • the ESP intervention takes place on the front wheel on the inside of the curve if the following conditions are met: 1.) The model-based maximum lateral force for the essentially linear area on the front axle is exceeded. 2.) No ESP motor torque reduction is activated. 3.) The measured steering angle a measurement is smaller than a model-based steering angle o model , in which the
  • the steering angle c model mentioned under point 3 of the condition measurement ⁇ x modes can according to the relationship
  • s track width.
  • brake pressure is applied to the wheel brake on the inside front wheel in addition to the inside rear wheel.
  • the braking pressure on the front wheel on the inside of the curve is limited to a slip value which corresponds to the ABS blocking pressure level.
  • the fact that the pressure build-up on the front wheel on the inside of the curve up to the ABS control range enables, on the one hand, a relatively large longitudinal force build-up, and thus a resulting maximum total force, which results in a yaw moment about the vertical axis of the vehicle, with a small reduction in lateral force.
  • the control of the brake pressure by means of the ABS control prevents the ABS-controlled wheel from becoming unstable in the event of safety-critical incorrect adjustments. This is particularly important in the two brake circuits customary today, in which an intervention takes place in both brake circuits according to the method according to the invention.
  • the control begins, ie a torque (yaw moment) around the vertical axis of the vehicle is generated via a brake pressure build-up on the two inside wheel brakes if the following conditions are met during ESP understeer intervention on the inside rear wheel: a.)
  • the ESP slip control determines a slip on the rear wheel that is preferably greater than a limit value G Sc i u pf> 15% b.)
  • the lateral acceleration on the front axle is greater than a vehicle-specific limit value GQ U er, above c.
  • GQ U er vehicle-specific limit value
  • ESP engine torque reduction is not active e.
  • Driver braking is preferably not determined.
  • the current steering angle measurement is smaller than the model-based steering angle cc model according to the relationship
  • the ESP understeer intervention on both wheels on the inside of the curve is prevented if g.)
  • the ESP controller performs an oversteer intervention or h.)
  • the actual yaw rate of the vehicle reaches the calculated target yaw rate.
  • the limit G Quet und te n is undershot.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Regulating Braking Force (AREA)

Abstract

L'invention concerne un procédé de régulation de la stabilité de conduite, consistant à déterminer des pressions sur les freins individuels sur la base de plusieurs grandeurs d'entrée de manière à accroître la stabilité du véhicule lors de l'intervention de l'ESP (Programme de Stabilité Electronique). L'invention vise à modifier la régulation de stabilité de conduite ESP de manière à empêcher efficacement tout sous-virage. A cet effet, en cas de sous-virage dans une courbe, on détermine s'il y a transmission de force entre la roue arrière intérieure et la chaussée lors de l'intervention de l'ESP, en corrélation avec une valeur seuil GSchlupf. En cas d'atteinte ou de dépassement de la valeur seuil, l'ESP agit également sur la roue intérieure avant, en plus de la roue intérieure arrière.
EP02748754A 2001-06-13 2002-06-10 Procede de regulation de la stabilite de conduite Withdrawn EP1399345A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10128690 2001-06-13
DE10128690A DE10128690A1 (de) 2001-06-13 2001-06-13 Verfahren zur Regelung der Fahrstabilität
PCT/EP2002/006344 WO2002100697A1 (fr) 2001-06-13 2002-06-10 Procede de regulation de la stabilite de conduite

Publications (1)

Publication Number Publication Date
EP1399345A1 true EP1399345A1 (fr) 2004-03-24

Family

ID=7688155

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02748754A Withdrawn EP1399345A1 (fr) 2001-06-13 2002-06-10 Procede de regulation de la stabilite de conduite

Country Status (5)

Country Link
US (1) US20040162662A1 (fr)
EP (1) EP1399345A1 (fr)
JP (1) JP2004528231A (fr)
DE (1) DE10128690A1 (fr)
WO (1) WO2002100697A1 (fr)

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Publication number Priority date Publication date Assignee Title
US20040186648A1 (en) * 2002-09-26 2004-09-23 Yuhong Zheng Boundary auto-calibration scheme for proportional poppet valve pressure control
KR100599662B1 (ko) * 2004-10-05 2006-07-12 한국타이어 주식회사 차량/타이어의 조종안정성을 위한 스티어 특성의 정량적인분석방법
JP2006306163A (ja) * 2005-04-26 2006-11-09 Fuji Heavy Ind Ltd 車両の挙動制御装置
DE102005053116A1 (de) * 2005-11-08 2007-05-10 Robert Bosch Gmbh Fahrdynamikregelungssystem mit Lastwechsel-Funktion
JP5588242B2 (ja) * 2010-06-29 2014-09-10 富士重工業株式会社 車両の制動力制御装置
DE102011076633A1 (de) * 2010-09-14 2012-03-15 Robert Bosch Gmbh Schräglagenabhängige Anpassung einer Bremskraftregelung bei einspurigen Fahrzeugen
DE102013216977A1 (de) * 2013-08-27 2015-03-19 Volkswagen Aktiengesellschaft Verfahren und Vorrichtung zum Betreiben eines Antriebssystems eines Kraftfahrzeugs mit mindestens einer angetriebenen Starrachse
DE102014201822A1 (de) * 2014-02-03 2015-08-06 Robert Bosch Gmbh Verfahren zum Betreiben eines Fahrzeugs
DE102022125561A1 (de) 2022-10-04 2024-04-04 Bayerische Motoren Werke Aktiengesellschaft Verfahren zum Betreiben eines Fahrzeugs und Fahrzeug

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DE4123232C2 (de) * 1991-07-13 1995-01-26 Daimler Benz Ag Verfahren zur Verhinderung von Instabilitäten des Fahrverhaltens eines Fahrzeuges
US5671143A (en) * 1994-11-25 1997-09-23 Itt Automotive Europe Gmbh Driving stability controller with coefficient of friction dependent limitation of the reference yaw rate
US5735584A (en) * 1994-11-25 1998-04-07 Itt Automotive Europe Gmbh Process for driving stability control with control via pressure gradients
US5774821A (en) * 1994-11-25 1998-06-30 Itt Automotive Europe Gmbh System for driving stability control
DE19601795A1 (de) * 1996-01-19 1997-07-24 Teves Gmbh Alfred Verfahren zur Erhöhung des Giermomentes eines Fahrzeugs
US6325469B1 (en) * 1996-09-06 2001-12-04 General Motors Corporation Brake control system
JPH10167036A (ja) * 1996-12-10 1998-06-23 Unisia Jecs Corp 車両運動制御装置
JPH10264798A (ja) * 1997-03-27 1998-10-06 Mazda Motor Corp 車両の姿勢制御装置
US6292735B1 (en) * 1998-08-10 2001-09-18 Ford Global Technologies, Inc. Wheelslip regulating brake control
DE50013191D1 (de) * 1999-03-08 2006-08-31 Daimler Chrysler Ag Antriebsschlupfregelverfahren mit soll-querbeschleunigung und regelschaltung für die durchführung des antriebsschlupfregelverfahrens
US6640171B2 (en) * 1999-12-15 2003-10-28 Delphi Technologies, Inc. Motor vehicle with supplemental rear steering having open and closed loop modes
US6415215B1 (en) * 2000-02-23 2002-07-02 Koyo Seiko Co., Ltd. Vehicle attitude control apparatus
EP1147960A1 (fr) * 2000-04-18 2001-10-24 Société de Technologie Michelin Actions sur la trajectoire d'un véhicule à partir de la mesure des efforts transversaux

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Title
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Also Published As

Publication number Publication date
JP2004528231A (ja) 2004-09-16
WO2002100697A1 (fr) 2002-12-19
US20040162662A1 (en) 2004-08-19
DE10128690A1 (de) 2002-12-19

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