DE3403237A1 - Brake system for motor vehicles - Google Patents
Brake system for motor vehiclesInfo
- Publication number
- DE3403237A1 DE3403237A1 DE19843403237 DE3403237A DE3403237A1 DE 3403237 A1 DE3403237 A1 DE 3403237A1 DE 19843403237 DE19843403237 DE 19843403237 DE 3403237 A DE3403237 A DE 3403237A DE 3403237 A1 DE3403237 A1 DE 3403237A1
- Authority
- DE
- Germany
- Prior art keywords
- brake
- pressure
- brake pressure
- pressure transducer
- master cylinder
- 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.)
- Granted
Links
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000006399 behavior Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 230000028838 turning behavior Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- 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
- B60T8/26—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force characterised by producing differential braking between front and rear wheels
- B60T8/266—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force characterised by producing differential braking between front and rear wheels using valves or actuators with external control means
- B60T8/268—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force characterised by producing differential braking between front and rear wheels using valves or actuators with external control means using the valves of an ABS, ASR or ESP system
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- 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
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
- B60T13/14—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps
- B60T13/142—Systems with master cylinder
- B60T13/145—Master cylinder integrated or hydraulically coupled with booster
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- 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
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
- B60T13/14—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps
- B60T13/148—Arrangements for pressure supply
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- 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
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
- B60T13/16—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using pumps directly, i.e. without interposition of accumulators or reservoirs
- B60T13/161—Systems with master cylinder
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- 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
- B60T8/26—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force characterised by producing differential braking between front and rear wheels
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- 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
- B60T8/343—Systems characterised by their lay-out
- B60T8/344—Hydraulic systems
- B60T8/346—2 Channel systems
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- 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
- B60T8/40—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 comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
- B60T8/4004—Repositioning the piston(s) of the brake control means by means of a fluid pressurising means in order to reduce the brake pressure
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- 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
- B60T8/40—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 comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
- B60T8/404—Control of the pump unit
- B60T8/405—Control of the pump unit involving the start-up phase
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- 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
- B60T8/44—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 co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems
- B60T8/445—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 co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems replenishing the released brake fluid volume into the brake piping
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- 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
- B60T8/44—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 co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems
- B60T8/447—Reducing the boost of the power-assist booster means to reduce brake pressure
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Regulating Braking Force (AREA)
Abstract
Description
Bremsanlage für Kraftfahrzeuge nach PatentBrake system for motor vehicles according to patent
(Patentanmeldung P 33 23 402.7) Die Erfindung betrifft eine Bremsanlage für Kraftfahrzeuge, insbesondere für Straßenfahrzeuge, mit einem pedalbetätigten mehrkreisigen hydraulischen Bremsdruckgeber, der im wesentlichen aus einem Bremskraftverstärker und einem Hauptzylinder besteht und der mit einem Hilfsenergieversorgungssystem verbunden ist, ferner mit Bremsdruckmodulatoren in den zu den Hinterrädern führenden Druckmittelleitungen und mit die Hinterradbremsen mit einem Druckausgleichsbehälter verbindenden Leitungen, in die auf Durchlaß umschaltbare Trennventile eingesetzt sind, sowie mit schaltbaren Ventilen zur Reduzierung der auf den Bremskraftverstärker übertragenen Hilfsenergie, des weiteren mit Sensoren und elektrischen Schaltungen zur Ermittlung und Auswertung des Raddrehverhaltens und zur Erzeugung von Steuersignalen, mit denen die Bremsdruckverteilung auf die Vorderräder und die Hinterräder in Abhängigkeit von dem Schlupf an den Vorderrädern und der Bremsdruckverlauf beim Auftreten von Blockiertendenzen beeinflußbar sind, nach Patent ... (Pttentanmeldung P 33 23 402.7).(Patent application P 33 23 402.7) The invention relates to a brake system for motor vehicles, in particular for road vehicles, with a pedal-operated multi-circuit hydraulic brake pressure transducer, which essentially consists of a brake booster and a master cylinder and that with an auxiliary power supply system is connected, also with brake pressure modulators in the leading to the rear wheels Pressure medium lines and with the rear wheel brakes with a pressure compensation tank connecting lines, inserted into the isolating valves that can be switched to passage are, as well as with switchable valves to reduce the on the brake booster transmitted auxiliary energy, furthermore with sensors and electrical circuits for the determination and evaluation of the wheel rotation behavior and for the generation of control signals, with which the brake pressure distribution to the front wheels and the rear wheels as a function of the slip on the front wheels and the brake pressure curve when Blocking tendencies can be influenced, according to patent ... (Patent application P 33 23 402.7).
Es sind bereits verschiedenartige Bremsanlagen mit Schlupfregelung bekannt. In den meisten Fällen wird bei diesen Anlagen mit Hilfe von Sensoren das Drehverhalten der einzelnen Räder sowie die Fahrzeuggeschwindigkeit ermittelt und, wenn die Meßwerte Blockiergefahr erkennen .lassen, in Abhängigkeit von dem Bremsschlupf, von den zeitlichen Änderungen der Meßwerte usw. der Bremsdruck konstant gehalten, gesenkt und gegebenenfalls wieder erhöhe. Dadurch läßt sich der Radschlupf auf einen für die Abbremsung, die Fahrstabilität und die Lenkfähigkeit des Fahrzeugs günstigen Wert regeln.There are already various types of brake systems with slip control known. In most cases this is done with the help of sensors in these systems Turning behavior the individual wheels as well as the vehicle speed determined and, if the measured values indicate a risk of blocking, depending on from the brake slip, from the changes in the measured values over time, etc. the brake pressure kept constant, lowered and, if necessary, increased again. This allows the Wheel slip on one for braking, driving stability and steering ability regulate the vehicle's favorable value.
Da der Kraftschluß der Räder auf der Straße und die beim Bremsen an den einzelnen Rädern auftretenden Kräfte und Drehmomente von zahlreichen Parametern abhängen, von denen die wichtigsten in sehr weiten Grenzen variieren, sind derartige Bremsschlupfregelanlagen verhältnismäßig aufwendig. Die Vereinfachung der Anlagen und das Verringern des Herstellungsaufwandes bei möglichst gleichbleibender Regelgenauigkeit und gleichem Regelkomfort ist daher eine zentrale Aufgabe bei der Entwicklung von Bremsschlupfregelanlagen.Because the frictional connection of the wheels on the road and when braking Forces and torques occurring on the individual wheels of numerous parameters depend, of which the most important vary within very wide limits, are such Brake slip control systems relatively expensive. The simplification of the facilities and the reduction in manufacturing costs while maintaining the same control accuracy as possible and equal control convenience is therefore a central task in the development of Brake slip control systems.
Bremsanlagen mit einer Hilfsenergiequelle.sind bereits in den deutschen Offenlegungsschriften DE-OS 30 40 561 und DE-OS 30 40 562 beschrieben. Der Bremsdruckgeber enthält bei diesen Anlagen ein mit dem Bremspedal gesteuertes Bremsdruckregelventil, an das ein Bremskreis direkt angeschlossen ist. Über einen Hauptzylinder, der mit dem Bremsdruckregelventil baulich vereinigt ist und der ebenfalls von der durch die Hilfsenergie verstärkten Bremspedalkraft beaufschlagt wird, sind weitere Bremskreise angeschlossen. Zur Bremsschlupfregelung sind an jedem geregelten Rad elektromagnetisch betätigte Einlaß- und Auslaßventile vorhanden, mit denen der Zufluß des Hydraulikmediums zur Radbremse gesperrt und eine hydraulische Verbindung zwischen der Radbremse und einem Druckausgleichsbehälter hergestellt werden kann. Über weitere Schaltventile läßt sich in die Arbeitsräume des Hauptzylinders dynamischer Druck aus der Hilfsenergiequelle einspeisen, wodurch der Abfluß von Hydraulikmedium in den Ausgleichsbehälter ausgeglichen und dadurch ein Erschöpfen bzw. ein "Leerregeln" der Hauptzylinder-Arbeitsräume durch wiederholten Druckabbau verhindert wird. Der erforderliche Aufwand an hydraulischen Baugruppen, einschließlich der Ventile, ist bei solchen Anlagen recht hoch.Brake systems with an auxiliary energy source. Are already in the German Offenlegungsschriften DE-OS 30 40 561 and DE-OS 30 40 562 described. The brake pressure transducer in these systems contains a brake pressure control valve controlled by the brake pedal, to which a brake circuit is directly connected. Via a master cylinder that is connected to the brake pressure control valve is structurally combined and also from the through the auxiliary energy is applied with increased brake pedal force, are further brake circuits connected. For brake slip control there are electromagnetic on each controlled wheel operated inlet and outlet valves with which the inflow of the hydraulic medium to the Wheel brake locked and a hydraulic connection between the wheel brake and a Pressure expansion tank can be produced. Via further switching valves dynamic pressure from the auxiliary energy source into the working spaces of the master cylinder feed, which compensates for the outflow of hydraulic medium into the expansion tank and thereby an exhaustion or an "emptying control" of the master cylinder working spaces is prevented by repeated pressure reduction. The required amount of hydraulic Assemblies, including the valves, is quite high in such systems.
Ferner sind bereits Anlagen mit Umlaufdrosselverstärker (DE-OS 30 40 548 und DE-OS 30 40 540) bekannt, bei denen im Druckmittelkreislauf einer die Hilfsenergie einspeisenden Pumpe ein Drosselventil eingefügt ist, das erst bei Bremsbetätigung schließt, dadurch den Druckaufbau in dem Hilfsenergieversorgungssystem einleitet und für die Bremskraftverstärkung sorgt. Im übrigen ist der Aufbau des wiederum aus einem Bremsventil und einem Hauptzylinder bestehenden Hydraulikaggregates sowie die Anordnung der im Regelfalle geschalteten Magnetventile ähnlich wie in den zuvor beschriebenen Anlagen.Furthermore, systems with circulating throttle amplifiers (DE-OS 30 40 548 and DE-OS 30 40 540) known, in which the pressure medium circuit is one A throttle valve is inserted into the auxiliary energy-feeding pump, which is only activated when the brake is actuated closes, thereby initiating the pressure build-up in the auxiliary energy supply system and takes care of the brake booster. In addition, the structure of the turn hydraulic unit consisting of a brake valve and a master cylinder as well as the arrangement of the normally switched solenoid valves is similar to that in the previous one described systems.
Ein anderes Problem bei der Auslegung von Bremsanlagen stellt die Anpassung der Bremskraftverteilung an die statischen und dynamischen Belastungen der Fahrzeugachsen dar. Die heute üblichen Bremskraftverteiler ermöglichen nur eine druckabhängige Regelung nach einer fest vorgegebenen Kennlinie. Lastabhängige oder verzögerungsabhängige Bremskraftverteiler sind ebenfalls in unterschiedlichen Ausführungen bekannt. Mit allen Geräten läßt sich jedoch nur eine relativ grobe Anpassung an die tatsächliche Achslastverteilung erreichen.Another problem in the design of braking systems poses the Adaptation of the braking force distribution to the static and dynamic loads of the vehicle axles. The brake force distributors commonly used today only allow one Pressure-dependent regulation according to a fixed, predetermined characteristic. Load-dependent or delay-dependent Brake force distributors are also in different Executions known. With all devices, however, only a relatively rough one can be used Achieve adaptation to the actual axle load distribution.
Bei einem weiteren bekannten Bremskraftverteiler wird die statische Achslastverteilung bei stehendem Fahrzeug mit Sensoren gemessen und in einen Mikrocomputer eingegeben, der unter Berücksichtigung dieser Meßwerte und des Bremsdruckes nach einer eingespeicherten mathematischen Beziehung die Bremskraftverteilung auf die Vorderachse und die Hinterachse steuert (europäische Patentanmeldung EP-A1 062246). Dieser Bremskraftverteiler besitzt den Nachteil, daß nur ein errechneter, nicht jedoch der tatsächlich zur Zeit des Bremsvorganges gegebene Kraftschluß für die Bremskraftverteilung maßgebend ist. Daher muß die Bremsanlage, um die gefährliche Überbremsung der Hinterachse mit Sicherheit zu vermeiden, derart ausgelegt werden, daß in den meisten Fällen der Beitrag der Hinterachse zur Abbremsung geringer ist als dies physikalisch möglich wäre. Außerdem ist zu berücksichtigen, daß die Ist-Werte in der Praxis von den rechnerisch vorgegebenen Soll-Werten stark abweichen können.In another known brake force distributor, the static Axle load distribution measured with sensors when the vehicle is stationary and entered into a microcomputer entered, taking these measured values and the brake pressure into account a stored mathematical relationship, the braking force distribution on the Controls the front axle and the rear axle (European patent application EP-A1 062246). This brake force distributor has the disadvantage that only a calculated, not However, the actually given at the time of braking for the frictional connection Brake force distribution is decisive. Therefore, the braking system has to avoid the dangerous Avoid overbraking the rear axle with certainty, designed in such a way that in most cases the contribution of the rear axle to the braking is less than this would be physically possible. It should also be taken into account that the actual values in practice, they can deviate significantly from the calculated target values.
Hinzu kommt, daß die bei der Auslegung der Bremskraftverteilung und bei Eingabe der mathematischen Beziehung als konstant angenommene Bremsen-Kennwerte infolge von Fertigungstoleranzen, Temperaturänderungen, Abnutzung, Verschmutzung usw. erheblichen Änderungen unterliegen. Deshalb wurde auch bereits vorgeschlagen, den Bremsschlupf an Vorder- und Hinterräder mit Hilfe von Rad- und Fahrzeugsensoren sowie von logischen Verknüpfungsschaltungen zu ermitteln und den Bremsschlupf an der Hinterachse in Abhängigkeit von dem Bremsschlupf der Vorderachse derart zu steuern, daß sich bei jedem Bremsvorgang an den Hinterrädern annähernd die gleiche Kraftschlußanstrengung wie an den Vorderrädern einstellt (deutsche Patentanmeldung P 33 01 948.7).In addition, the design of the braking force distribution and When entering the mathematical relationship, brake characteristic values assumed to be constant as a result of manufacturing tolerances, temperature changes, wear and tear, soiling etc. are subject to significant changes. It has therefore already been suggested that Brake slip on the front and rear wheels with the help of wheel and vehicle sensors as well as logic combination circuits to determine and the Brake slip on the rear axle as a function of the brake slip on the front axle to be controlled in such a way that each time the brake is applied to the rear wheels approx sets the same frictional connection effort as on the front wheels (German patent application P 33 01 948.7).
Es bleibt jedoch der Nachteil, daß sich auch mit einem solchen Bremskraftverteiler höchstens erreichen läßt, daß in den meisten Fällen bei zu starker Bremsbetätigung zunächst die Vorderräder und erst dann die Hinterräder blockieren. Dies ist wichtig, weil das Blockieren der Hinterräder mit einer hohen Schleudergefahr verbunden ist, während der Verlust der Lenkfähigkeit durch Blockieren der Vorderräder im Vergleich dazu das kleinere Übel darstellt. Bei zu starker Bremsbetätigung, die sich bei glatter Fahrbahn, z.B. bei Schnee- oder Wasserglätte, schon bei einem geringen Bremspedaldruck einstellt, läßt sich mit allen beschriebenen Bremskraftverteilern nicht verhindern, daß sowohl die Vorderräder als auch die Hinterräder blockieren und dadurch das Fahrzeug seine Lenkfähigkeit und seine Fahrstabilität verliert.However, there remains the disadvantage that even with such a brake force distributor at most can achieve that in most cases when the brakes are applied too hard first block the front wheels and only then block the rear wheels. This is important, because locking the rear wheels is associated with a high risk of skidding, while the loss of steering ability by locking the front wheels in comparison represents the lesser of two evils. If the brakes are applied too hard, which is smoother Road, e.g. on slippery snow or water, even with a low brake pedal pressure adjusts, cannot be prevented with any of the brake force distributors described, that both the front wheels and the rear wheels lock and thereby the vehicle loses its steering ability and driving stability.
Zur Vermeidung dieser Nachteile wurde mit dem Hauptpatent eine Bremsanlage vorgeschlagen, die bei jedem normalen Bremsvorgang die Verteilung des Bremsdruckes auf die Vorderachse und auf die Hinterachse steuert und die außerdem, wenn die Elektronik eine Blockiergefahr ermittelt, durch Konstanthalten des Bremsdruckes oder Absenken den Bremsschlupf regelt und dadurch das Blockieren der einzelnen Räder verhindert. Dies wird durch die eingangs genannte Anlage mit einem relativ einfachen Bremsdruckgeber und wenigen Bremsdruckmodulatoren bzw. schaltbaren Ventilen erreicht. Bei dieser Anlage werden die einzelnen Bauteile sowohl zur Steuerung der Bremskraftverteilung als auch zur Bremsschlupfregelung eingesetzt. Allerdings wird dabei in Kauf genommen, daß in manchen Fällen der Bremsdruck an den beiden Radbremsen der Vorderachse ungleichmäßig ist und daß sich zumindest in einem Bremskreis der Druck nur bis auf einen von der Pedalkraft abhängigen Restwert reduzieren läßt.To avoid these disadvantages, the main patent was a braking system proposed that the distribution of the brake pressure during every normal braking process controls on the front axle and on the rear axle and also if the electronics a risk of locking is determined by keeping the brake pressure constant or by lowering it regulates the brake slip and thereby prevents the individual wheels from locking. This is achieved by the system mentioned at the beginning with a relatively simple brake pressure transducer and few brake pressure modulators or switchable valves achieved. With this system the individual components are used both to control the braking force distribution as also used for brake slip control. However, it is accepted that that in some cases the brake pressure on the two wheel brakes on the front axle is uneven is and that at least in one brake circuit the pressure is only up to one of the Can reduce pedal force dependent residual value.
Der Erfindung liegt daher die Aufgabe zugrunde, den Bremsdruckverlauf bei einer derartigen Bremsanlage zu verbessern und im Bedarfsfalle eine völlige Absenkung des Bremsdruckes an der Vorderachse zu ermöglichen. Dies ist besonders bei geringen Kraftschlußbeiwerten, z.B. auf glatter Fahrbahn, von großer Bedeutung, weil in diesen Fällen bereits ein verhältnismäßig geringer Bremsdruck zum Blockieren führen kann oder eine Wiederbeschleunigung des Rades während des Regelzyklusses verhindert.The invention is therefore based on the object of the brake pressure curve to improve in such a brake system and, if necessary, a complete one To enable lowering of the brake pressure on the front axle. This is special with low adhesion coefficients, e.g. on a slippery road surface, of great importance, because in these cases there is already a relatively low brake pressure for locking or a re-acceleration of the wheel during the control cycle prevented.
Es hat sich nun gezeigt, daß diese Aufgabe in überraschend einfacher Weise durch eine Weiterbildung einer Bremsanlage nach dem Hauptpatent gelöst werden kann, deren Besonderheit darin besteht, daß in dem Hilfsenergieversorgungssystem Drosselstellen und Ventile eingefügt sind, mit denen zum Abbau des Bremsdruckes während der Bremsschlupfregelung eine der Pedalkraft entgegengerichtete Hilfskraft erzeugbar und an den Bremsdruckgeber anschaltbar ist.It has now been shown that this task is surprisingly easier Way can be solved by a further development of a brake system according to the main patent can, the peculiarity of which is that in the auxiliary power supply system Throttles and valves are inserted with which to reduce the brake pressure an auxiliary force opposing the pedal force during the brake slip control can be generated and connected to the brake pressure transducer.
Nach einer vorteilhaften Ausführungsart der Erfindung ist das Hilfsenergieversorgungssystem mit einer Druckmittelpumpe ausgerüstet, die Drosselstelle zur Erzeugung der entgegengerichteten Kraft ist in diesem Falle im Förderstrom der Pumpe, d.h. zwischen der Druckseite der Pumpe und dem Hilfsenergie-Einlaß des Bremsdruckgebers, eingefügt. In Reihe zu dem Ventil, mit dem die auf den Bremsdruckgeber übertragbare Hilfsenergie reduzierbar ist, befindet sich eine weitere Drosselstelle, an der ein Steuerdruck entsteht, mit dem über ein hydraulisch betätigtes Mehrwegeventil die entgegengerichtete Kraft an den Bremsdruckgeber anschaltbar ist.According to an advantageous embodiment of the invention, the auxiliary power supply system equipped with a pressure medium pump, the throttle point to generate the opposite In this case, the force is in the delivery flow of the pump, i.e. between the pressure side the pump and the auxiliary power inlet of the brake pressure transducer. In row to the valve with which the auxiliary energy that can be transmitted to the brake pressure transducer can be reduced there is another throttle point at which a control pressure is created, with the opposing force via a hydraulically operated multi-way valve can be connected to the brake pressure transducer.
Des weiteren ist es nach einer Ausführungsart der Erfindung vorgesehen, daß der Steuerdruck auf ein 3/2-Wegeventil einwirkt, das in der Ruhestellung den Druckausgleichsbehälter und nach der Umschaltung die Druckseite der Druckmittelpumpe mit dem Einlaß des Bremsdruckgebers für den gegen die Pedalkraft wirkenden Druck verbindet.Furthermore, it is provided according to one embodiment of the invention, that the control pressure acts on a 3/2-way valve, which in the rest position the Pressure equalization tank and after switching the pressure side of the pressure medium pump with the inlet of the brake pressure transducer for the pressure acting against the pedal force connects.
Das Verhältnis zwischen dem Differenzdruck über der im Förderstrom der Druckmittelpumpe angeordneten Drosselstelle und dem Steuerdruck liegt erfindungsgemäß zwischen 5:1 und 20:1 und beträgt vorzugsweise etwa 10:1.The ratio between the differential pressure over that in the flow the pressure medium pump arranged throttle point and the control pressure is according to the invention between 5: 1 and 20: 1 and is preferably about 10: 1.
Nach einer besonders einfachen Ausführungsart der Erfindung besteht der Bremsdruckgeber im wesentlichen aus einem mit einem Einfachhauptzylinder kombinierten Umlaufdrosselverstärker, an dessen Drosselventil ein Bremskreis direkt angeschlossen ist. An die beiden hydraulischen Bremskreise dieses Bremsdruckgebers sind in Diagonalaufteilung die Radbremsen angeschaltet, wobei vorzugsweise jeder Bremskreis direkt mit der Radbremse eines Vorderrades und über einen Bremsdruckmodulator, z.B. über ein 2/2-Wegeventil, mit dem diagonalen Hinterrad verbunden ist.According to a particularly simple embodiment of the invention, there is the brake pressure transducer essentially consists of a combined with a single master cylinder Circulating throttle booster, to whose throttle valve a brake circuit is directly connected is. The two hydraulic brake circuits of this brake pressure transducer are diagonally divided the Wheel brakes switched on, preferably each brake circuit directly to the wheel brake a front wheel and a brake pressure modulator, e.g. a 2/2-way valve, connected to the diagonal rear wheel.
Der Bremsdruckgeber kann jedoch auch aus einem hydraulischen Bremskraftverstärker und einem Tandem-Hauptzylinder bestehen.The brake pressure transducer can, however, also consist of a hydraulic brake booster and a tandem master cylinder.
In einem weiteren Ausführungsbeispiel der Erfindung besitzt der Bremsdruckgeber einen pedalbetätigten Stufenkolben, der mit dem Hauptzylinderkolben integriert ist und der eine Ringfläche aufweist, die in Gegenrichtung zur Pedalkraft mit Druck beaufschlagbar ist.In a further exemplary embodiment of the invention, the brake pressure transducer has a pedal-operated stepped piston that is integrated with the master cylinder piston and which has an annular surface which is in the opposite direction to the pedal force with pressure can be acted upon.
Weitere Merkmale, Vorteile und Anwendungsmöglichkeiten der Erfindung gehen aus der nachstehenden Beschreibung eines Ausführungsbeispiels anhand der beigefügten Abbildungen hervor.Further features, advantages and possible uses of the invention go from the following description of an exemplary embodiment with reference to the attached Illustrations.
Es zeigen in schematischer Vereinfachung Fig. 1 das hydraulische und elektrische Schaltbild einer besonders einfachen Bremsanlage nach der Erfindung und Fig. 2 im Axialschnitt einen Bremsdruckgeber für die Bremsanlage nach Fig. 1.It shows in a schematic simplification Fig. 1 the hydraulic and electrical circuit diagram of a particularly simple brake system according to the invention and FIG. 2 shows, in axial section, a brake pressure transducer for the brake system according to FIG. 1.
Die Bremsanlage nach Fig. 1 besitzt zwei diagonal aufgeteilte Bremskreise 1 und 2, die an einen Bremsdruckgeber 3 angeschlossen sind, der sich hier im wesentlichen aus einem Umlaufdrosselverstärker 4 und einem Einfach-Hauptzylinder 5 zusammensetzt. An das Drosselventil des Umlaufdrosselverstärkers 4 ist ein Bremskreis, nämlich der Bremskreis 2, direkt angeschlossen. Daher genügt ein Einfach-Hauptzylinder 5 zum Anschluß des zweiten Bremskreises.The brake system according to Fig. 1 has two diagonally divided brake circuits 1 and 2 attached to a brake pressure transducer 3 are connected to the consists essentially of a circulation throttle amplifier 4 and a single master cylinder 5 composed. A brake circuit is attached to the throttle valve of the circulation throttle booster 4 namely the brake circuit 2, connected directly. A single master cylinder is therefore sufficient 5 for connecting the second brake circuit.
An die Bremskreise 1 und 2 sind die Vorderradbremsen 6,7 unmittelbar, die Hinterradbremsen 8,9 dagegen über Bremsdruckmodulatoren 10,11 angeschlossen.The front wheel brakes 6.7 are directly connected to brake circuits 1 and 2, the rear brakes 8, 9, however, are connected via brake pressure modulators 10, 11.
Zur Versorgung mit Hilfsenergie ist eine elektromotorisch angetriebene Druckmittelpumpe 12 vorhanden, deren Druckseite über eine Drosselstelle 13 mit dem Bremsdruckgeber 3 bzw. dem Verstärker 4 verbunden ist. Der Rücklauf und die Saugseite der Pumpe führen zu einem Druckausgleichsbehälter 14. Außerdem liegt der Pumpe ein Überdruckventil 15 parallel.An electric motor is used to supply auxiliary energy Pressure medium pump 12 available, the pressure side via a throttle point 13 with the Brake pressure transducer 3 or the booster 4 is connected. The return and the suction side the pump lead to a pressure equalization tank 14. In addition, the pump is a Pressure relief valve 15 in parallel.
Die auf den Bremsdruckgeber 3 wirkende Pedalkraft ist durch den Pfeil F symbolisiert. Bei der Pedalbetätigung wird, verstärkt durch die Kraft aus dem Hilfsenergieversorgungssystem, sofort Bremsdruck in den Bremskreisen 1 und 2 und damit in den Vorderradbremsen 6,7 erzeugt. Da die als Bremsdruckmodulatoren 10,11 verwendeten 2/2-Wegeventile in der Ruhestellung gesperrt sind, wird erst dann in den Hinterradbremsen 8,9 Druck aufgebaut, nachdem diese Ventile umgeschaltet sind.The pedal force acting on the brake pressure transducer 3 is indicated by the arrow F symbolizes. When the pedal is operated, it is reinforced by the force from the Auxiliary energy supply system, brake pressure in brake circuits 1 and 2 and immediately thus generated 6.7 in the front brakes. Since the brake pressure modulators 10,11 2/2-way valves used are blocked in the rest position, is only then activated in the rear brakes 8.9 pressure built up after these valves are switched.
Über ein weiteres 2/2-Wegeventil 16 und zwei Rückschlagventile 17,18, die die beiden Hinterradbremsen 8,9 mit dem Ventil 16 verbinden, jedoch eine hydraulische Kopplung verhindern, läßt sich bei der Anordnung nach Fig. 1 eine Verbindung zu dem Druckausgleichsbehälter 14 herstellen, so daß über diesen Weg - nach Umschalten des Ventiles 16 - der Bremsdruck an den Hinterradbremsen 8,9 abgebaut werden kann.Via another 2/2-way valve 16 and two check valves 17, 18, which the two rear brakes 8.9 with connect to valve 16, However, prevent a hydraulic coupling, can be in the arrangement of Fig. 1 establish a connection to the pressure equalization tank 14, so that over this Away - after switching the valve 16 - the brake pressure on the rear brakes 8.9 can be broken down.
Zum Abbau des Vorderradbremsdruckes ist ein weiteres 2/2-Wegeventil 19 parallel zu den Eingängen des Verstärkers 4 für die Hilfsenergie geschaltet. Nach Umschaltung dieses Ventils 19 in die Durchlaßstellung wird die Hilfsenergie gewissermaßen kurzgeschlossen, wobei lediglich wegen einer in Serie zu diesem Ventil geschalteten Drosselstelle 20 ein für die Verstärkung unbedeutender Restdruck bleibt.Another 2/2-way valve is used to reduce the front brake pressure 19 connected in parallel to the inputs of the amplifier 4 for the auxiliary power. After switching this valve 19 into the open position, the auxiliary energy to a certain extent short-circuited, and only because of one in series with this valve switched throttle point 20 remains a residual pressure insignificant for the gain.
Die Steuerung der Bremsdruckmodulatoren 10,11 und der Druckabbauventile 16,19 übernimmt eine Elektronik 22, die die hierfür notwendigen Informationen über das Raddrehverhalten und die Fahrzeuggeschwindigkeit über die Anschlüsse sl bis s4 erhält, die mit induktiven Radsensoren S1 bis S4 verbunden sind.The control of the brake pressure modulators 10, 11 and the pressure reduction valves 16,19 takes over an electronics 22, which the necessary information about the wheel rotation behavior and the vehicle speed via the connections sl to s4, which are connected to inductive wheel sensors S1 to S4.
Zur Erzeugung und Steuerung einer Hilfskraft, die zum Druckabbau der Pedalkraft F entgegengerichtet werden kann, dienen die Drosselstellen 13,20 und ein hydraulisch betätigtes 3/2-Wegeventils 21. Wird das Ventil 21 erregt und dadurch auf Durchfluß geschaltet, fällt über der Drosselstelle 20 ein Steuerdruck ab, der das Ventil 21 umschaltet. Der wesentlich größere, z.B. zehnfache Differenzdruck, der durch die vom Förderstrom der Pumpe 12 durchflossene Drosselstelle 13 erzeugt wird, wird nun über eine Druckmittelleitung 13 an den Einlaß 24 des Bremsdruckgebers 3 angeschaltet, über den der hier eingespeiste Druck der Pedalkraft F entgegenwirkt.To generate and control an auxiliary worker who is responsible for reducing the pressure of the Pedal force F can be counteracted, the throttle points 13, 20 and serve a hydraulically operated 3/2-way valve 21. If the valve 21 is energized and thereby switched to flow, a control pressure drops across the throttle point 20, the the valve 21 switches over. The much larger, e.g. ten times the differential pressure, the is generated by the throttle point 13 through which the flow of the pump 12 flows, is now via a pressure medium line 13 to the inlet 24 of the brake pressure transducer 3 switched on, via which the pressure fed in here counteracts the pedal force F.
Fig. 2 zeigt eine mögliche Ausbildung des Bremsdruckgebers 3 und die Erzeugung einer der Verstärkerkraft entgegenwirkenden Hilfskraft.Fig. 2 shows a possible design of the brake pressure transducer 3 and the Generation of an auxiliary force counteracting the booster force.
Der Bremskraftverstärker 3 besitzt als wesentlichen Bestandteil einen einstückigen Stufenkolben 25, der mit dem Hauptzylinderkolben 25' integriert ist. Die Pedalkraft F wirkt über eine Druckstange 26 unmittelbar auf ein Drosselventil 27, das Bestandteil eines Umlaufdrosselverstärkers ist. Der zum Rücklaufbehälter 14, vergleiche Fig. 1, führende Anschluß ist mit 28 bezeichnet.The brake booster 3 has an essential component one-piece stepped piston 25 which is integrated with the master cylinder piston 25 '. The pedal force F acts directly on a throttle valve via a push rod 26 27, which is part of a circulating throttle amplifier. The one to the return tank 14, see FIG. 1, the leading connection is denoted by 28.
Schließt das Ventil 27, wird in bekannter Weise Druck aufgebaut, der über den Anschluß 29 direkt in den Bremskreis 2 eingespeist wird. Gleichzeitig wird der Stufenkolben 25 verschoben, so daß auch das Schnüffelloch 30 verschlossen und Bremsdruck im Bremskreis 1, dem Hauptzylinderbremskreis, aufgebaut wird.When the valve 27 closes, pressure is built up in a known manner is fed directly into the brake circuit 2 via the connection 29. At the same time will the stepped piston 25 moved so that the sniffer hole 30 closed and Brake pressure in brake circuit 1, the master cylinder brake circuit, is built up.
Der Stufenkolben 25 besitzt des weiteren eine Ringkolbenfläche 32 in einem Ringraum 31 des Bremsdruckgebers 3.The stepped piston 25 also has an annular piston surface 32 in an annular space 31 of the brake pressure transducer 3.
Wird das 3/2-Wegeventil 21, siehe Fig. 2, umgeschaltet, wird der über der Drossel 13 anfallende Differenzdruck über den Einlaß 24 in diesen Ringraum 31 übertragen, so daß eine der Pedalkraft F entgegengerichtete Hilfskraft entsteht. Durch diese sehr einfachen Maßnahmen läßt sich in einer durch die Bremsschlupfregelung ausgelösten Druckabbauphase die Pedalkraft F kompensieren, so daß in beiden Bremskreisen 1 und 2 der Bremsdruck völlig abgebaut werden kann. Dadurch wird es möglich, ohne Einbußen an die Regelgenauigkeit die Bremskreise 1,2 direkt mit den Vorderradbremsen 6,7 zu verbinden. Ein Sperrventil und Druckablaßventile werden dadurch an den Vorderradbremsen überflüssig, was zur Reduzierung des Gesamt-Herstellungsaufwandes der Bremsanlage wesentlich beiträgt.If the 3/2-way valve 21, see FIG. 2, switched over, the over the differential pressure arising from the throttle 13 via the inlet 24 into this annular space 31 transmitted so that an auxiliary force opposing the pedal force F is produced. By these very simple measures in one through the Brake slip regulation triggered pressure reduction phase compensate the pedal force F, so that the brake pressure can be completely reduced in both brake circuits 1 and 2. This makes it possible to use the brake circuits 1, 2 without any loss of control accuracy to connect directly to the front brakes 6,7. A check valve and pressure relief valves are thus superfluous on the front brakes, which reduces the overall manufacturing costs contributes significantly to the braking system.
Anstelle eines Einfach-Hauptzylinders gemäß Fig. 1 und Fig. 2 kann auch ein Tandem-Hauptzylinder verwendet werden, z.B. wenn drei Bremskreise oder der Anschluß beider Bremskreise an den Hauptzylinder aus bestimmten Gründen zweckmäßig sind.Instead of a single master cylinder according to FIGS. 1 and 2, a tandem master cylinder can also be used, e.g. if three brake circuits or the connection of both brake circuits to the master cylinder is useful for certain reasons are.
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Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19843403237 DE3403237A1 (en) | 1983-04-07 | 1984-01-31 | Brake system for motor vehicles |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3312443 | 1983-04-07 | ||
| DE19833323402 DE3323402A1 (en) | 1983-04-07 | 1983-06-29 | BRAKE SYSTEM FOR MOTOR VEHICLES |
| DE19843403237 DE3403237A1 (en) | 1983-04-07 | 1984-01-31 | Brake system for motor vehicles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE3403237A1 true DE3403237A1 (en) | 1985-08-01 |
Family
ID=27190914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19843403237 Granted DE3403237A1 (en) | 1983-04-07 | 1984-01-31 | Brake system for motor vehicles |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE3403237A1 (en) |
Cited By (8)
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| WO1988001954A1 (en) * | 1986-09-11 | 1988-03-24 | Automotive Products Plc | Vehicle antilock braking systems |
| US4750788A (en) * | 1985-07-30 | 1988-06-14 | Alfred Teves Gmbh | Brake unit with slip control |
| EP0310036A2 (en) * | 1987-09-28 | 1989-04-05 | Sumitomo Electric Industries Limited | Proportioning control valve for use with antilock device |
| EP0323731A2 (en) * | 1988-01-04 | 1989-07-12 | LUCAS INDUSTRIES public limited company | Improvements in hydraulic anti-lock braking systems for vehicles |
| EP0325390A1 (en) * | 1988-01-21 | 1989-07-26 | Automotive Products Plc | Vehicle antilock braking systems |
| WO1989008573A2 (en) * | 1988-03-08 | 1989-09-21 | Alfred Teves Gmbh | Brake system |
| WO1993007034A1 (en) * | 1991-09-30 | 1993-04-15 | Robert Bosch Gmbh | Hydraulic braking system, especially for motor vehicles, with differential lock |
| DE4200046A1 (en) * | 1992-01-03 | 1993-07-08 | Daimler Benz Ag | BRAKE SYSTEM WITH ADJUSTABLE CHANGEABLE FRONT AXLE / REAR AXLE BRAKE FORCE DISTRIBUTION |
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| DE2145433B2 (en) * | 1971-09-10 | 1979-06-21 | Alfred Teves Gmbh, 6000 Frankfurt | Antiblocking brake control for vehicles - operates with one control valve and flow restrictions on lines to modulating cylinder |
| DE2609904A1 (en) * | 1976-03-10 | 1977-09-15 | Bosch Gmbh Robert | HYDRAULIC BRAKE AMPLIFIER |
| DE3040561A1 (en) * | 1980-10-28 | 1982-05-27 | Alfred Teves Gmbh, 6000 Frankfurt | FOREIGN ENERGY FEED BRAKE SLIP CONTROL SYSTEM OF A HYDRAULIC VEHICLE BRAKE SYSTEM |
| DE3040562A1 (en) * | 1980-10-28 | 1982-05-27 | Alfred Teves Gmbh, 6000 Frankfurt | FOREIGN ENERGY FEED BRAKE SLIP CONTROL SYSTEM OF A HYDRAULIC VEHICLE BRAKE SYSTEM |
| DE3040540A1 (en) * | 1980-10-28 | 1982-05-27 | Alfred Teves Gmbh, 6000 Frankfurt | FOREIGN ENERGY FEED BRAKE SLIP CONTROL SYSTEM OF A HYDRAULIC VEHICLE BRAKE SYSTEM |
| DE3040548A1 (en) * | 1980-10-28 | 1982-05-27 | Alfred Teves Gmbh, 6000 Frankfurt | BRAKE SLIP CONTROL SYSTEM OF A HYDRAULIC VEHICLE BRAKING SYSTEM |
| EP0062246A1 (en) * | 1981-04-03 | 1982-10-13 | CORINT S.r.l. | Braking system for motorvehicles |
| DE3301948A1 (en) * | 1983-01-21 | 1984-07-26 | Alfred Teves Gmbh, 6000 Frankfurt | METHOD AND DEVICE FOR CONTROLLING THE BRAKING DISTRIBUTION |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4750788A (en) * | 1985-07-30 | 1988-06-14 | Alfred Teves Gmbh | Brake unit with slip control |
| GB2213893A (en) * | 1986-09-11 | 1989-08-23 | Automotive Products Plc | Vehicle antilock braking systems |
| WO1988001954A1 (en) * | 1986-09-11 | 1988-03-24 | Automotive Products Plc | Vehicle antilock braking systems |
| EP0310036A2 (en) * | 1987-09-28 | 1989-04-05 | Sumitomo Electric Industries Limited | Proportioning control valve for use with antilock device |
| EP0310036A3 (en) * | 1987-09-28 | 1989-12-06 | Sumitomo Electric Industries Limited | Proportioning control valve for use with antilock device |
| EP0323731A3 (en) * | 1988-01-04 | 1990-05-23 | Lucas Industries Public Limited Company | Improvements in hydraulic anti-lock braking systems for vehicles |
| EP0323731A2 (en) * | 1988-01-04 | 1989-07-12 | LUCAS INDUSTRIES public limited company | Improvements in hydraulic anti-lock braking systems for vehicles |
| EP0325390A1 (en) * | 1988-01-21 | 1989-07-26 | Automotive Products Plc | Vehicle antilock braking systems |
| WO1989008573A2 (en) * | 1988-03-08 | 1989-09-21 | Alfred Teves Gmbh | Brake system |
| WO1989008573A3 (en) * | 1988-03-08 | 1989-10-19 | Teves Gmbh Alfred | Brake system |
| US5000525A (en) * | 1988-03-08 | 1991-03-19 | Alfred Teves Gmbh | Brake system |
| WO1993007034A1 (en) * | 1991-09-30 | 1993-04-15 | Robert Bosch Gmbh | Hydraulic braking system, especially for motor vehicles, with differential lock |
| DE4200046A1 (en) * | 1992-01-03 | 1993-07-08 | Daimler Benz Ag | BRAKE SYSTEM WITH ADJUSTABLE CHANGEABLE FRONT AXLE / REAR AXLE BRAKE FORCE DISTRIBUTION |
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