DE102007030441A1 - Brake system e.g. break-by-wire system, for motor vehicle i.e. small car, has hydraulic brake system comprising simulator unit to extract hydraulic fluid from brake system to provide driver about pedal sensation at brake pedal - Google Patents
Brake system e.g. break-by-wire system, for motor vehicle i.e. small car, has hydraulic brake system comprising simulator unit to extract hydraulic fluid from brake system to provide driver about pedal sensation at brake pedal Download PDFInfo
- Publication number
- DE102007030441A1 DE102007030441A1 DE200710030441 DE102007030441A DE102007030441A1 DE 102007030441 A1 DE102007030441 A1 DE 102007030441A1 DE 200710030441 DE200710030441 DE 200710030441 DE 102007030441 A DE102007030441 A DE 102007030441A DE 102007030441 A1 DE102007030441 A1 DE 102007030441A1
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- Prior art keywords
- brake
- hydraulic
- brake system
- pedal
- braking
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
- B60W30/18—Propelling the vehicle
- B60W30/18009—Propelling the vehicle related to particular drive situations
- B60W30/18109—Braking
- B60W30/18127—Regenerative braking
-
- 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
- B60T7/00—Brake-action initiating means
- B60T7/02—Brake-action initiating means for personal initiation
- B60T7/04—Brake-action initiating means for personal initiation foot actuated
- B60T7/042—Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors
-
- 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
- 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
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/48—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
- B60T8/4809—Traction control, stability control, using both the wheel brakes and other automatic braking systems
- B60T8/4827—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems
- B60T8/4863—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems
- B60T8/4872—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems pump-back systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/18—Conjoint control of vehicle sub-units of different type or different function including control of braking systems
- B60W10/184—Conjoint control of vehicle sub-units of different type or different function including control of braking systems with wheel brakes
-
- 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
- B60T2270/60—Regenerative braking
- B60T2270/613—ESP features related thereto
Abstract
Description
Die vorliegende Erfindung betrifft ein Bremssystem für ein Kraftfahrzeug mit einem Bremspedal, mindestens einem Sensor zur Erfassung eines über das Bremspedal zum Ausdruck gebrachten Fahrerbremswunsches und einem ersten Teilbremssystem, das als Hydraulikbremssystem ausgeführt ist und einen Hauptbremszylinder, mindestens zwei Radbremsen, ein Fahrdynamikregelsystem und mindestens eine Hydraulikleitung umfasst, wobei das Fahrdynamikregelsystem über die mindestens eine Hydraulikleitung mit dem Hauptbremszylinder verbunden ist und ausgelegt ist, Hydraulikfluid von der mindestens einen Hydraulikleitung über jeweils ein zugeordnetes Ventil in mindestens eine Radbremse zu leiten, um dadurch eine Bremswirkung zu erzielen. Sie betrifft überdies ein Verfahren zum Betreiben eines derartigen Bremssystems eines Kraftfahrzeugs.The The present invention relates to a brake system for a motor vehicle having a Brake pedal, at least one sensor for detecting a via the Brake pedal expressed driver brake request and a first partial braking system, which is designed as a hydraulic brake system and a master cylinder, at least two wheel brakes, a vehicle dynamics control system and at least one hydraulic line, wherein the driving dynamics control system on the at least one hydraulic line connected to the master cylinder is and is designed, hydraulic fluid from the at least one hydraulic line via each direct an associated valve into at least one wheel brake, thereby to achieve a braking effect. It also concerns a method for operating such a brake system of Motor vehicle.
Ein
gattungsgemäßes, aus
dem Stand der Technik bekanntes Bremssystem ist in
Bei Hybridantriebsfahrzeugen treten Bremszustände auf, in denen die Fahrzeugverzögerung nicht über die hydraulisch betätigten Radbremsen genauer gesagt Radreibbremsen, sondern auch über einen mit den Rädern verbundenen Generator erfolgen soll, um mit diesem elektrische Energie aus der Bewegungsenergie des Fahrzeugs zurückgewinnen zu können. Zur Rückgewinnung von möglichst viel Energie bei einer Fahrzeugverzögerung ist es erforderlich, dass die Verzögerung ausschließlich oder teilweise – je nach Fahrzustand – über den Generator erfolgt.at Hybrid drive vehicles occur braking conditions in which the vehicle deceleration does not have the hydraulically operated Wheel brakes, more specifically, wheel friction brakes, but also over one with the wheels Connected generator should be made to handle this electrical energy to recover from the kinetic energy of the vehicle. to reclamation from as possible a lot of energy in a vehicle deceleration it is necessary that the delay exclusively or partially - ever after driving condition - over the Generator takes place.
Aus dem Stand der Technik sind überdies Bremseinrichtungen für Hybridantriebsfahrzeuge bekannt, die zwar auch über ein Generatorbremssystem verfügen, bei denen jedoch das Hydraulikbremssystem als „Break-By-Wire-System" ausgeführt ist. Bei diesem bekannten Systemen fehlt die Hydraulikverbindung zwischen Tandemhauptbremszylinder und Radbremsen. Das vom Sensor zur Erfassung des Fahrerbremswunsches erfasste Signal wird in ein elektrisches Signal umgewandelt und an eine Motor-Pumpen-Einheit mit einem Speicher gekoppelt oder an eine Spannkrafterzeugungseinheit pro Rad geleitet, um eine Bremswirkung auszulösen. Reine Break-By-Wire-Systeme sind aufgrund der erforderlichen Sicherheitsanforderungen und des damit einhergehenden Aufwands für zahlreiche Anwendungen, insbesondere in Kleinwagen, zu teuer.Out In addition, the prior art are braking devices for hybrid drive vehicles although they are also known have a generator braking system, however, where the hydraulic brake system is designed as a "break-by-wire system" This known systems lack the hydraulic connection between Tandem master cylinder and wheel brakes. That of the sensor for detecting the Driver brake request detected signal becomes an electrical signal converted and sent to a motor-pump unit with a memory coupled or passed to a clamping force generating unit per wheel, to trigger a braking effect. Pure break-by-wire systems are due to the required safety requirements and the associated expense for numerous applications, in particular in small cars, too expensive.
Bei einem gattungsgemäßen Bremssystem tritt nun, anders als bei einem Break-By-Wire-System, das Problem auf, dass in dem ersten Teilbremssystem, das als Hydraulikbremssystem ausgeführt ist, bei einer Bremspedalbetätigung ein hydraulischer Bremsdruckaufbau an den Radbremsen durch Schließen der den Radbremsen zugeordneten, im Fahrdynamikregelsystem angeordneten Ventile verhindert werden kann, um eine Fahrzeugverzögerung unter Energierückgewinnung zu ermöglichen. Dadurch wird jedoch die Schluckkennlinie des Bremssystems erheblich verändert, wodurch sich eine unerwünschte Veränderung der Charakteristik Pedalkraft/Pedalweg und Pedalweg/Fahrzeugverzögerung ergibt. Diese Veränderung ist deshalb unerwünscht, da hierüber unter anderem auch die Dosierung der Bremse stattfindet. Eine Veränderung der Charakteristik Pedalkraft/Pedalweg und Pedalweg/Fahrzeugverzögerung würde eine korrekte Dosierung der Bremse durch den Fahrer erschweren, was in einer Gefährdung von Fahrzeug und Insassen resultieren würde.at a generic brake system occurs now, unlike a break-by-wire system, the problem arises that in the first partial braking system, acting as a hydraulic brake system is executed, on a brake pedal operation a hydraulic brake pressure build-up on the wheel brakes by closing the Assigned wheel brakes, arranged in the vehicle dynamics control system Valves can be prevented to a vehicle deceleration below Energy recovery to enable. This, however, the Schluckkennlinie the brake system considerably changed which causes an undesirable change the characteristic pedal force / pedal travel and pedal travel / vehicle deceleration results. This change is therefore undesirable since here over Among other things, the dosage of the brake takes place. A change the characteristic pedal force / pedal travel and pedal travel / vehicle deceleration would be a correct dosage of the brake by the driver complicate what is in a danger would result from vehicle and occupants.
Die Aufgabe der vorliegenden Erfindung besteht deshalb darin, ein gattungsgemäßes Bremssystem bzw. ein gattungsgemäßes Verfahren derart weiterzubilden, dass bei hoher Zuverlässigkeit eine Reduktion des Kraftstoffverbrauchs des Kraftfahrzeugs ermöglicht wird ohne Fahrer und Fahrzeug durch ein ungewohntes Pedalgefühl an der Bremse zu gefährden.The object of the present invention is therefore a generic brake System or a generic method such that with high reliability, a reduction of the fuel consumption of the motor vehicle is made possible without compromising driver and vehicle by an unfamiliar pedal feel on the brake.
Diese Aufgabe wird gelöst durch ein Bremssystem mit den Merkmalen von Patentanspruch 1 sowie durch ein Verfahren zum Betreiben eines Bremssystems mit den Merkmalen von Patentanspruch 11.These Task is solved by a braking system with the features of claim 1 and by a method of operating a braking system having the features of claim 11.
Die vorliegende Erfindung basiert auf der Erkenntnis, dass diese Aufgabe gelöst werden kann, wenn zunächst ein gattungsgemäßes Bremssystem um ein zweites Teilbremssystem erweitert wird, das als Generatorbremssystem ausgeführt ist, d. h. ausgelegt ist durch entsprechende Ansteuerung eines Generators eine Bremswirkung zu erzielen. Überdies ist das Hydraulikbremssystem um mindestens eine Simulatoreinheit zu erweitern, die ausgelegt ist, Hydraulikfluid aus dem Hydraulikbremssystem zu entnehmen und in das Hydraulikbremssystem zurückzuführen, um einem Fahrer am Bremspedal ein Pedalgefühl bereitzustellen, das unabhängig von der Art des aktivierten Teilbremssystems/der aktivierten Teilbremssysteme ist. Durch diese Maßnahme kann einerseits eine Reduktion des Kraftstoffverbrauchs des Fahrzeugs sichergestellt werden, zum anderen ist bei entsprechender Dimensionierung der mindestens einen Simulatoreinheit das Pedalgefühl am Bremspedal für den Fahrer unverändert, egal ob eine reine Hydraulikbremsung, eine reine Generatorbremsung oder eine Mischung der beiden vorliegt.The The present invention is based on the finding that this object solved can be, if at first a generic brake system to a second partial braking system is extended, which serves as a generator braking system accomplished is, d. H. is designed by appropriate control of a generator to achieve a braking effect. Moreover, it is the hydraulic brake system to at least one simulator unit expand, which is designed hydraulic fluid from the hydraulic brake system and fed back into the hydraulic brake system to a driver on the brake pedal a pedal feel to provide that independently on the type of activated partial braking system / partial braking systems is. By this measure On the one hand, it can reduce the fuel consumption of the vehicle on the other hand, with appropriate dimensioning the at least one simulator unit the pedal feel on the brake pedal for the Driver unchanged, whether a pure hydraulic braking, a pure generator braking or a mixture of the two is present.
Gemäß der vorliegenden Erfindung wird demnach die durch das Generatorbremssystem verursachte Bremswirkung in eine entsprechende Bremswirkung des Hydrauliksystems umgerechnet und die Menge an Hydraulikfluid, die bei dieser entsprechenden Hydraulikbremsung verdrängt worden wäre, durch die mindestens eine Simulatoreinheit aufgenommen. Wird während eines Bremsvorgangs der Anteil der Generatorbremsung erhöht, wird demnach noch mehr Hydraulikfluid von der Simulatoreinheit aufgenommen, wird der Anteil der Generatorbremsung reduziert, wird in der Simulatoreinheit befindliches Hydraulikfluid von der mindestens einen Simulatoreinheit in das Hydraulikbremssystem zurückgeführt. Damit wird dem Fahrer ein Bremssystem zur Verfügung gestellt, bei dem er nicht mehr unterscheiden kann, welches der Bremssysteme augenblicklich aktiv ist. Dadurch kann er die Bremse in gewohnter Art und Weise und dadurch präzise, korrekt und zuverlässig dimensionieren. Überdies sind durch das erfindungsgemäße Bremssystem die Kosten reduziert, da es nach wie vor auf dem zuverlässigen, bekannten Hydrauliksystem basiert – im Gegensatz zum Break-By-Wire-System – und sich daher quasi als Add-On-System realisieren lässt.According to the present Invention is therefore caused by the generator brake system Braking effect in a corresponding braking effect of the hydraulic system converted and the amount of hydraulic fluid that corresponds to this Hydraulic braking displaced would have been received by the at least one simulator unit. Will during a Braking process increases the proportion of generator braking Accordingly, even more hydraulic fluid is taken up by the simulator unit. If the proportion of generator braking is reduced, this is done in the simulator unit located hydraulic fluid from the at least one simulator unit returned to the hydraulic brake system. In order to the driver is provided with a braking system in which he does not can distinguish more which of the brake systems instantaneously is active. This allows him to brake in the usual way and thereby precise, correct and reliable dimension. moreover are due to the brake system according to the invention the cost is reduced, as it is still on the reliable, well-known Hydraulic system based - in Contrary to the break-by-wire system - and therefore quasi as Implement add-on system leaves.
Bei einer bevorzugten Ausführungsform ist dem Teil des Hydraulikbremssystems nach dem mindestens einen einer Radbremse zugeordneten Ventil eine Schluckkennlinie zugeordnet, wobei die mindestens eine Simulatoreinheit ausgelegt ist, bei einem alleinigen oder zum Hydraulikbremssystem zusätzlichen Betrieb des Generatorbremssystems diese Schluckkennlinie nachzubilden.at a preferred embodiment is the part of the hydraulic brake system after the at least one assigned to a wheel brake associated with a swallow characteristic, wherein the at least one simulator unit is designed, in a sole or to the hydraulic brake system additional operation of the generator brake system to replicate this swallowing characteristic.
Bei einer bevorzugten Realisierung umfasst die mindestens eine Simulatoreinheit eine Ventilvorrichtung und eine Kolbenvorrichtung, wobei die Ventilvorrichtung hydraulisch mit der Hydraulikleitung und die Kolbenvorrichtung hydraulisch mit der Ventilvorrichtung gekoppelt ist. Durch die Ventilvorrichtung kann demnach die Entnahme von Hydraulikfluid aus dem Hydraulikbremssystem bzw. die Zurückführung von Hydraulikfluid in das Hydraulikbremssystem gesteuert werden. Durch die Kolbenvorrichtung kann Hydraulikfluid aufgenommen und wieder abgegeben werden.at A preferred implementation comprises the at least one simulator unit a valve device and a piston device, wherein the valve device hydraulically with the hydraulic line and the piston device hydraulically is coupled to the valve device. Through the valve device can Accordingly, the removal of hydraulic fluid from the hydraulic brake system or the repatriation of Hydraulic fluid to be controlled in the hydraulic brake system. By the piston device can receive hydraulic fluid and again be delivered.
In einer bevorzugten Ausführungsform weist die Ventilvorrichtung eine erste und eine zweite Durchgangscharakteristik auf, wobei gemäß der ersten Durchgangscharakteristik ein Transport von Hydraulikfluid nur von der Kolbenvorrichtung in Richtung zur Hydraulikleitung ermöglicht ist, und wobei gemäß der zweiten Durchgangscharakteristik ein Transport von Hydraulikfluid von der Kolbenvorrichtung in Richtung zur Hydraulikleitung und ein Transport von Hydraulikfluid zur Kolbenvorrichtung ermöglicht ist. Die erste Durchgangscharakteristik korrespondiert daher mit einer reinen Hydraulikbrem sung, die zweite Durchgangscharakteristik mit einer alleinigen oder zur Hydraulikbremsung zusätzlichen Generatorbremsung.In a preferred embodiment The valve device has a first and a second passage characteristic on, according to the first Passing characteristic a transport of hydraulic fluid only from the piston device is allowed in the direction of the hydraulic line, and wherein according to the second Passing characteristic a transport of hydraulic fluid from the Piston device towards the hydraulic line and a transport is made possible by hydraulic fluid to the piston device. The first transmission characteristic therefore corresponds to a pure Hydraulikbrem solution, the second Continuity characteristic with a single or hydraulic braking additional Generator braking.
Bevorzugt ist dabei die zweite Durchgangscharakteristik derart ausgelegt, dass der Transport von Hydraulikfluid von der Hydraulikleitung zur Kolbenvorrichtung durch eine Drossel erfolgt. Durch die Drossel kann eine Verlustcharakteristik eingeführt werden. Dabei dient die Drossel insbesondere zur Simulation der Drosselverluste in den Bremsleitungen zwischen dem Fahrdynamikregelsystem und den Radbremsen sowie der Drosselverluste in dem Fahrdynamikregelsystem.Prefers if the second transmission characteristic is designed in such a way that the transport of hydraulic fluid from the hydraulic line to Piston device is performed by a throttle. Through the throttle a loss characteristic can be introduced. It serves the Throttle in particular for simulating the throttle losses in the brake lines between the vehicle dynamics control system and the wheel brakes and throttle losses in the vehicle dynamics control system.
Die Kolbenvorrichtung umfasst bevorzugt einen Kolben, der hydraulisch an die Ventilvorrichtung gekoppelt ist, wobei der Kolben beweglich über die Feder an der Basis abgestützt ist. Durch die Feder, insbesondere durch Dimensionierung deren Federkonstante, kann eine weitere Verlustcharakteristik in das System eingeführt werden. Bevorzugt ist dabei die Basis beweglich ausgebildet. Insofern ist es weiterhin bevorzugt, wenn die Kolbenvorrichtung eine Antriebsvorrichtung umfasst, um die Basis in Richtung zum Kolben und von diesem wegzubewegen. Damit kann unter Beaufschlagung des Hydraulikfluids durch die Verlustcharakteristik gemäß der Drossel und/oder der Verlustcharakteristik gemäß der Feder die Entnahme bzw. die Zurückführung von Hydraulikfluid beeinflusst werden.The piston device preferably comprises a piston which is hydraulically coupled to the valve device, wherein the piston is movably supported by the spring on the base. By the spring, in particular by dimensioning the spring constant, a further loss characteristic can be introduced into the system. Preferably, the base is designed to be movable. In this respect, it is furthermore preferred if the piston device comprises a drive device in order to move the base in the direction of the piston and away from it. Thus, by acting on the hydraulic fluid by the loss characteristic according to the throttle and / or the loss characteristic according to the spring, the removal or the return of hydraulic fluid can be influenced.
Es ist insbesondere bevorzugt, wenn das Bremssystem eine Steuervorrichtung umfasst mit einem Eingang, der mit dem mindestens einen Sensor zur Erfassung eines über das Bremspedal zum Ausdruck gebrachten Fahrerbremswunsches gekoppelt ist, einem ersten Ausgang zur Ansteuerung der Ventilvorrichtung, um die erste oder die zweite Durchgangscharakteristik auszuwählen, einem zweiten Ausgang zur Ansteuerung der Antriebsvorrichtung der Simulatoreinheit und mindestens zwei weiteren Ausgängen zur Ansteuerung des mindestens einen Ventils, das der mindestens einen Radbremse zugeordnet ist.It is particularly preferred when the brake system is a control device comprising an input connected to the at least one sensor for Capturing an over the brake pedal is expressed coupled to the driver's brake request, a first output for driving the valve device to the select first or second pass characteristics, one second output for controlling the drive device of the simulator unit and at least two further outputs for controlling the at least a valve associated with the at least one wheel brake.
Bevorzugt basiert ein erfindungsgemäßes Bremssystem aus Gründen der erhöhten Sicherheit auf einem bekannten hydraulischen Zweikreis-Bremssystem. Dabei ist eine erste und eine zweite Hydraulikleitung vorgesehen, wobei eine erste Simulatoreinheit mit der ersten Hydraulikleitung und eine zweite Simulatoreinheit mit der zweiten Hydraulikleitung verbunden ist, wobei das Fahrdynamikregelsystem ausgelegt ist, Hydraulikfluid aus der ers ten Hydraulikleitung über ein jeweils zugeordnetes Ventil in eine erste und eine zweite Radbremse und Hydraulikfluid aus der zweiten Hydraulikleitung über ein jeweils zugeordnetes Ventil in eine dritte und eine vierte Radbremse zu leiten. Bei einem so genannten „X-System" sind die Radbremsen VR und HL mit einer Hydraulikleitung und die Radbremsen VL und HR mit der anderen Hydraulikleitung verbunden. Dabei können beide Simulatoreinheiten identisch ausgebildet sein. Bei einem so genannten „Schwarz/Weiß-System", sind die Radbremsen VR und VL mit einer Hydraulikleitung und die Radbremsen HR und HL mit der anderen Hydraulikleitung verbunden. Dabei sind die beiden Simulatoreinheiten zur Nachbildung unterschiedlicher Schluckkennlinien meist unterschiedlich dimensioniert.Prefers is based on a brake system according to the invention for reasons the heightened Safety on a known hydraulic dual-circuit brake system. there a first and a second hydraulic line is provided, wherein a first simulator unit with the first hydraulic line and a second simulator unit connected to the second hydraulic line is, wherein the driving dynamics control system is designed, hydraulic fluid from the first hydraulic line via a respective associated valve in a first and a second wheel brake and hydraulic fluid from the second hydraulic line via one respectively associated valve in a third and a fourth wheel brake conduct. In a so-called "X-system" are the wheel brakes VR and HL with a Hydraulic line and the wheel brakes VL and HR with the other hydraulic line connected. It can Both simulator units may be identical. With a so called "black and white system", are the wheel brakes VR and VL with a hydraulic line and the wheel brakes HR and HL connected to the other hydraulic line. Here are the two Simulator units for simulating different swallow characteristics usually different dimensions.
Weitere bevorzugte Ausführungsformen ergeben sich aus den Unteransprüchen.Further preferred embodiments emerge from the dependent claims.
Die mit Bezug auf das erfindungsgemäße Bremssystem vorgestellten, bevorzugten Ausführungsformen, deren Details und Vorteile gelten entsprechend, soweit anwendbar für das erfindungsgemäße Verfahren.The with reference to the brake system according to the invention presented, preferred embodiments, their details and benefits apply accordingly, as applicable for the inventive method.
Im Nachfolgenden wird nunmehr ein Ausführungsbeispiel eines erfindungsgemäßen Bremssystems unter Bezugnahme auf die beigefügten Zeichnungen näher beschrieben. Es zeigen:in the Below is now an embodiment of a brake system according to the invention with reference to the attached Drawings closer described. Show it:
Die
mit Bezug auf
Bei
einem erfindungsgemäßen Bremssystem
ist zunächst
weiterhin ein Generatorbremssystem
Bei
einem erfindungsgemäßen Bremssystem
ist jede Hydraulikleitung
Dem
Fahrdynamikregelsystem
Zur
Funktionsweise:
Fall 1:
Bei einer rein generatorischen
Bremsung betätigt
der Fahrer in gewohnter Weise das Bremspedal
Case 1:
In a purely regenerative braking, the driver operates in the usual way, the brake pedal
Gleichzeitig
werden die beiden Ventile V1, V2 durch elektrische Ansteuerung der
elektrischen Stellvorrichtungen
Durch
die Wirkung der Kolbenvorrichtungen K1, K2 wird zusammen mit den
Drosseln
Der
Generator
Die
generatorische Bremsleistung reicht jedoch bei weitem nicht zur
vollständigen
Abdeckung aller im Fahrzeugbetrieb aufdeckenden Bremssituationen
aus und ist ferner, wie bereits oben erwähnt, vom Fahrzeugzustand bzw.
vom Zustand elektrischer Komponenten hinter dem Generator
Das
Zusammenwirken der Komponenten eines erfindungsgemäßen Bremssystems
zu diesem Fall wird nun beschrieben:
Fall 2:
Zunächst wird
das Fahrzeug rein generatorisch, siehe oben Fall 1, verzögert. Dann
muss die rein generatorische Bremsung in einem Blendvorgang in eine rein
hydraulische Bremsung überführt werden.
Dazu wird die generatorische Bremsung durch entsprechende Ansteuerung
des Generators
Case 2:
First, the vehicle is delayed in a purely regenerative manner, see case 1 above. Then the pure regenerative braking must be converted into a purely hydraulic braking in a glare process. For this purpose, the regenerative braking by appropriate control of the generator
Ergänzend sei
angemerkt, dass durch die Rückschlagventile
Claims (11)
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