EP3472007A1 - Method and device for operating a brake system, brake system - Google Patents

Method and device for operating a brake system, brake system

Info

Publication number
EP3472007A1
EP3472007A1 EP17718351.4A EP17718351A EP3472007A1 EP 3472007 A1 EP3472007 A1 EP 3472007A1 EP 17718351 A EP17718351 A EP 17718351A EP 3472007 A1 EP3472007 A1 EP 3472007A1
Authority
EP
European Patent Office
Prior art keywords
brake pedal
brake
pressure generator
actuation
detected
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Withdrawn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
EP17718351.4A
Other languages
German (de)
French (fr)
Inventor
Andreas Bresser
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority claimed from PCT/EP2017/058823 external-priority patent/WO2017220229A1/en
Publication of EP3472007A1 publication Critical patent/EP3472007A1/en
Withdrawn legal-status Critical Current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
    • 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
    • B60T13/146—Part of the system directly actuated by booster pressure
    • 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
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
    • 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
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
    • B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
    • 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
    • B60T13/74—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 electrical assistance or drive
    • B60T13/745—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 electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder
    • 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
    • B60T8/32—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
    • B60T8/321—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 deceleration
    • B60T8/3255—Systems in which the braking action is dependent on brake pedal data
    • B60T8/3275—Systems with a braking assistant function, i.e. automatic full braking initiation in dependence of brake pedal velocity
    • 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
    • B60T8/4059—Control of the pump unit involving the rate of delivery
    • 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
    • B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for 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
    • 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
    • B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
    • B60T8/4081—Systems with stroke simulating devices for driver input
    • 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
    • B60T2201/00—Particular use of vehicle brake systems; Special systems using also the brakes; Special software modules within the brake system controller
    • B60T2201/03—Brake assistants
    • 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
    • B60T2270/82—Brake-by-Wire, EHB
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/81—Braking systems

Definitions

  • the invention relates to a method for operating a hydraulic motor
  • Brake system of a motor vehicle comprising at least one hydraulically actuated wheel brake, a brake pedal device with an actuated brake pedal for setting a desired braking torque and a pressure generator, which is electrically actuated to generate a hydraulic pressure in dependence on the desired braking torque, wherein an electrical operating current of the pressure generator in Normal operation is limited to a first predetermined limit.
  • the invention relates to a device for carrying out the
  • Vacuum brake booster dispensed and instead an electrically controllable pressure generator is used.
  • This generates the hydraulic pressure without being mechanically coupled to the brake pedal. Rather, the operation of the brake pedal is detected and monitored by one or more sensors and the pressure generator in dependence on the Brake pedal actuation activated.
  • the pressure generator is, for example, a pump, which is associated with an electric motor to set electro-hydraulically the pressure in the brake system. In this case, the pressure generator is controlled such that a required by the driver by pressing the brake pedal desired braking torque is set at one or more wheel brakes of the brake system to delay the motor vehicle.
  • the electric motor is driven such that in the case of low speeds, the torque and thus the operating current are limited to a first limit.
  • the inventive method with the features of claim 1 has the advantage that the brake pedal device on the type of operation of the
  • the method according to the invention has the advantage that the driver is provided with the desired braking torque in a short time during highly dynamic braking processes, while nevertheless ensuring that overheating of the pressure generator, in particular its electric motor, is permanently prevented.
  • Braking does not last long, but is characterized in particular by its temporal brevity, overheating of the electric motor due to the short-term increased load on the electric motor is almost impossible.
  • Brake pedal operating speed exceeds a predetermined second limit.
  • the operating speed of the brake pedal is expediently monitored and compared with the second limit value.
  • Brake pedal actuation speed is in particular by means of a
  • Displacement sensor determines which is assigned to the brake pedal.
  • a highly dynamic actuation is detected when a detected brake pedal travel exceeds a predefinable third limit value.
  • the brake pedal travel is compared here with a third limit value.
  • the third limit value is selected to prevent brake pedal operations, which are performed at a high speed but require only a low braking torque, from being detected as high-dynamic brake pedal operations.
  • the first limit value is predetermined as a function of an operating temperature of the pressure generator.
  • the advantage is achieved that a dynamic control of the pressure generator takes place, which depends on the current operating temperature of the pressure generator.
  • the current operating temperature is compared with a maximum allowable operating temperature to determine whether or not the temperature may continue to rise.
  • the first limit value is varied, so that exceeding the limit temperature is reliably prevented. It is assumed that high-dynamic braking increases the operating temperature only briefly and thus negligibly. According to an advantageous development is also provided that the
  • Limiting the operating current through the first limit only at speeds below a fourth limit occurs. This takes into account that, in particular at low rotational speeds, the torque for driving the pressure generator is high, so that in this case high operating currents occur which lead to heating of the pressure generator, in particular its electric motor. to lead.
  • the pressure generator operates in a high speed range
  • the first limit value as a function of a permissible operating temperature of the pressure generator at a
  • the first limit value is specified in particular fixed and not dynamic and corresponds to the
  • Brake pedal actuation generates a status message and to a
  • Pressure generator activating control unit sends.
  • the brake pedal device thus sends the information as to whether or not a high-dynamic brake pedal actuation has taken place, even to the control device, which then actuates the pressure generator in response to this information or suspends or adjusts the limit by the first limit value.
  • the device according to the invention with the features of claim 8 is characterized by a control unit, which is specially adapted to, at
  • the braking system according to the invention with the features of claim 9 is characterized by the device according to the invention. This results in the already mentioned advantages.
  • Figure 1 shows a hydraulic brake system of a motor vehicle in a schematic representation
  • Figure 2 is a flowchart for explaining an advantageous
  • Figure 1 shows a simplified representation of a brake system 1 for a motor vehicle not shown here in detail.
  • the brake system 1 has a plurality of wheel brakes 2, which by a driver of the motor vehicle by a
  • Brake pedal device 3 can be actuated as service brakes.
  • the wheel brakes 2 are denoted by LR, RF, LF and RR, which explains their position or assignment on the motor vehicle, where LR stands for the left rear, RF for the right front, LF for the left front and RR for the right rear.
  • LR stands for the left rear
  • RF for the right front
  • LF for the left front
  • RR for the right rear.
  • the two brake circuits 4 and 5 are constructed identically, so that the structure of both brake circuits 4, 5 will be explained in more detail below with reference to the brake circuit 4.
  • the brake circuit 4 is first with a master cylinder 6 of the
  • Brake pedal device 3 is connected, wherein the master cylinder 6 is designed here as a double-piston or tandem cylinder, and wherein the brake pedal device 3 also actuated by the driver
  • the brake circuit 4 has a switching valve 8, which follows the master cylinder 6.
  • the switching valve 8 is designed to be normally open and allows a flow of the hydraulic medium of the brake circuit, so the brake fluid, in both directions.
  • the switching valve 8 is further with the two wheel brakes 2 with the interposition of one
  • Inlet valve 10 is connected, which is formed normally open in both directions.
  • the wheel brakes 2 of the brake circuit 4 is also assigned in each case an exhaust valve 11, which is designed to be normally closed.
  • the Exhaust valves 11 are connected on the outlet side with a hydraulic tank 9, which supplies the master cylinder 6 with hydraulic medium.
  • the outlet valves 11 are also connected to a suction side of a pump 13 which is connected on the pressure side between the changeover valve 8 and the inlet valves 10 to the brake circuit 4.
  • the pump 13 is presently designed as a piston pump and mechanically coupled to an electric motor 14, wherein the pump 13 and the electric motor 14 together form a pressure generator 15 of the brake system 1.
  • the electric motor 14 is assigned to the pumps 13 of both brake circuits 3, 4 and 5.
  • each brake circuit 4, 5 has its own electric motor 14.
  • the master cylinder 6 is also a hydraulic
  • Hydraulic pressure is automatically increased by the pressure generator 15 in the brake system 1, so that the driver with little effort a high
  • FIG. 2 shows a simplified flowchart for explaining an advantageous method for operating the brake system.
  • the method Upon actuation of the brake pedal 7 of the braking device 3, the method is started in the first step Sl.
  • a subsequent query S2 it is checked whether the brake pedal operation is a high-dynamic brake pedal operation. For this purpose, the actuation speed and the actuation travel of the brake pedal 7 are detected and compared with a respective limit value.
  • the detected brake pedal travel exceeds the assigned limit value and the actuation speed is higher than the corresponding limit value, it is recognized that a high-dynamic brake actuation occurs (j). However, if the actuation speed is less than the limit and / or the brake pedal is not allowed beyond the associated limit Pedal away, it is recognized that there is no high-dynamic brake pedal operation (s) and referenced to a step S3. In this step, the operating current for the pressure generator 15 is limited to the allowable first limit.
  • Electric motor of the pressure generator 15 is prevented, it is provided that in normal operation, the operating current of the pressure generator is limited by a first limit. This will be explained in more detail with reference to the method shown in FIG.
  • step S4 the pressure generator 15 is then activated in step S4 to generate the hydraulic pressure.
  • the brake pedal actuation is a high-dynamic brake pedal actuation (j)
  • step S4 the procedure advances from step S2 to step S4, so that the limitation of the operating current does not take place or is canceled.
  • the pressure generator 15 can be supplied with an increased operating current in a highly dynamic braking process, so that it is a high even at low speeds
  • Brake system 1 is built in a very short time. Due to the fact that the limitation is only canceled for high-dynamic braking operations, it is ensured in normal operation that the operating temperature is not exceeded. In a highly dynamic braking process, the thermal load depends on the amount and duration of the operating current. Because at a highly dynamic braking process, the thermal load depends on the amount and duration of the operating current. Because at a highly dynamic braking process, the thermal load depends on the amount and duration of the operating current. Because at a highly dynamic
  • Torque increase depends on the dimensioning of the electric motor and the implemented current limits.
  • FIG. 3 shows by way of example in a diagram the torque characteristic of the electric motor 14 of the pressure generator 15, as the pressure moment Md over the speed n, in normal operation (K1) and in the case of a highly dynamic one
  • Characteristics Kl and K2 lie one above the other.

Abstract

The invention relates to a method for operating a hydraulic brake system (1) of a motor vehicle, having at least one hydraulically actuable wheel brake (2), a brake pedal device (3) with an actuable brake pedal (7) for predefining a setpoint braking torque and a pressure generator (15) which is electrically actuated in order to generate a hydraulic pressure as a function of the setpoint braking torque, wherein in a normal operating mode an electrical operating current of the pressure generator (15) is limited to a first predefinable limiting value. There is provision that the brake pedal device (3) is monitored for the type of activation of the brake pedal (7), and in that when a highly dynamic actuation of the brake pedal (7) is detected, the limiting of the operating current is cancelled.

Description

Beschreibung Titel  Description title
Verfahren und Vorrichtung zum Betreiben eines Bremssystems, Bremssystem  Method and device for operating a brake system, brake system
Die Erfindung betrifft ein Verfahren zum Betreiben eines hydraulischen The invention relates to a method for operating a hydraulic
Bremssystems eines Kraftfahrzeugs, aufweisend zumindest eine hydraulisch betätigbare Radbremse, eine Bremspedaleinrichtung mit einem betätigbaren Bremspedal zur Vorgabe eines Soll-Bremsmoments und einen Druckerzeuger, der zur Erzeugung eines Hydraulikdrucks in Abhängigkeit von dem Soll- Bremsmoment elektrisch angesteuert wird, wobei ein elektrischer Betriebsstrom des Druckerzeugers in einem Normalbetrieb auf einen ersten vorgebbaren Grenzwert begrenzt wird. Brake system of a motor vehicle, comprising at least one hydraulically actuated wheel brake, a brake pedal device with an actuated brake pedal for setting a desired braking torque and a pressure generator, which is electrically actuated to generate a hydraulic pressure in dependence on the desired braking torque, wherein an electrical operating current of the pressure generator in Normal operation is limited to a first predetermined limit.
Ferner betrifft die Erfindung eine Vorrichtung zur Durchführung des Furthermore, the invention relates to a device for carrying out the
beschriebenen Verfahrens sowie ein Bremssystem mit einer derartigen described method and a brake system with such
Vorrichtung. Contraption.
Stand der Technik State of the art
Verfahren, Vorrichtungen und Bremssysteme der eingangs genannten Art sind aus dem Stand der Technik bereits bekannt. Während bei konventionellen Bremssystemen ein Vakuumbremskraftverstärker in der Bremspedaleinrichtung genutzt wird, um die von dem Fahrer auf das Bremspedal ausgeübte Bremskraft zu verstärken und in den Hydraulikkreis des Bremssystems einzuleiten, sind mittlerweile auch Bremssysteme bekannt, bei welchen auf einen Methods, devices and braking systems of the type mentioned are already known from the prior art. While in conventional brake systems, a vacuum brake booster is used in the brake pedal device to amplify the braking force exerted by the driver on the brake pedal and to initiate in the hydraulic circuit of the brake system, brake systems are now known in which a
Vakuumbremskraftverstärker verzichtet und stattdessen ein elektrisch ansteuerbarer Druckerzeuger eingesetzt wird. Dieser erzeugt den Hydraulikdruck ohne mechanisch mit dem Bremspedal gekoppelt zu sein. Vielmehr wird die Betätigung des Bremspedals durch einen oder mehrere Sensoren erfasst und überwacht und der Druckerzeuger in Abhängigkeit von der Bremspedalbetätigung angesteuert. Der Druckerzeuger ist beispielsweise eine Pumpe, welcher ein Elektromotor zugeordnet ist, um elektrohydraulisch den Druck in dem Bremssystem einzustellen. Dabei wird der Druckerzeuger derart angesteuert, dass ein von dem Fahrer durch Betätigen des Bremspedals gefordertes Soll-Bremsmoment an einer oder mehreren Radbremsen des Bremssystems eingestellt wird, um das Kraftfahrzeug zu verzögern. Vacuum brake booster dispensed and instead an electrically controllable pressure generator is used. This generates the hydraulic pressure without being mechanically coupled to the brake pedal. Rather, the operation of the brake pedal is detected and monitored by one or more sensors and the pressure generator in dependence on the Brake pedal actuation activated. The pressure generator is, for example, a pump, which is associated with an electric motor to set electro-hydraulically the pressure in the brake system. In this case, the pressure generator is controlled such that a required by the driver by pressing the brake pedal desired braking torque is set at one or more wheel brakes of the brake system to delay the motor vehicle.
Um ein Überhitzen des Druckerzeugers beziehungsweise dessen Elektromotors zu verhindern, wird der Elektromotor derart angesteuert, dass im Fall von niedrigen Drehzahlen das Drehmoment und damit der Betriebsstrom auf einen ersten Grenzwert begrenzt sind. To prevent overheating of the pressure generator or its electric motor, the electric motor is driven such that in the case of low speeds, the torque and thus the operating current are limited to a first limit.
Offenbarung der Erfindung Disclosure of the invention
Das erfindungsgemäße Verfahren mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass die Bremspedaleinrichtung auf die Art der Betätigung des The inventive method with the features of claim 1 has the advantage that the brake pedal device on the type of operation of the
Bremspedals überwacht wird, und dass bei Erfassen einer hoch-dynamischen Betätigung die Begrenzung des Betriebsstroms aufgehoben wird. Das erfindungsgemäße Verfahren hat den Vorteil, dass dem Fahrer bei hochdynamischen Bremsvorgängen das gewünschte Bremsmoment in kurzer Zeit zur Verfügung gestellt wird, wobei dennoch gewährleistet ist, dass eine Überhitzung des Druckerzeugers, insbesondere dessen Elektromotors, dauerhaft verhindert wird. Dadurch, dass die Begrenzung für hoch-dynamische Bremsvorgänge aufgehoben ist, kann der Benutzer bei einem hoch-dynamischen Bremsvorgang in kurzer Zeit das Bremsmoment abfragen. Weil ein hoch-dynamischer Brake pedal is monitored, and that upon detection of a highly dynamic operation, the limitation of the operating current is canceled. The method according to the invention has the advantage that the driver is provided with the desired braking torque in a short time during highly dynamic braking processes, while nevertheless ensuring that overheating of the pressure generator, in particular its electric motor, is permanently prevented. The fact that the limit for high-dynamic braking is canceled, the user can query the braking torque in a high-dynamic braking in a short time. Because a highly dynamic
Bremsvorgang nicht lange anhält, sondern sich insbesondere durch seine zeitliche Kürze auszeichnet, ist ein Überhitzen des Elektromotors aufgrund der kurzzeitigen erhöhten Belastung des Elektromotors nahezu ausgeschlossen. Braking does not last long, but is characterized in particular by its temporal brevity, overheating of the electric motor due to the short-term increased load on the electric motor is almost impossible.
Gemäß einer bevorzugten Weiterbildung der Erfindung ist vorgesehen, dass auf eine hoch-dynamischen Betätigung erkannt wird, wenn eine erfasste According to a preferred embodiment of the invention it is provided that is detected on a highly dynamic actuation when a detected
Bremspedalbetätigungsgeschwindigkeit einen vorgebbaren zweiten Grenzwert überschreitet. Hierzu wird zweckmäßigerweise die Betätigungsgeschwindigkeit des Bremspedals überwacht und mit dem zweiten Grenzwert verglichen. Brake pedal operating speed exceeds a predetermined second limit. For this purpose, the operating speed of the brake pedal is expediently monitored and compared with the second limit value.
Überschreitet die erfasste Geschwindigkeit den zweiten Grenzwert, so wird die zuvor beschriebene Begrenzung des Betriebsstroms aufgehoben. Die If the detected speed exceeds the second limit, the previously described limitation of the operating current canceled. The
Bremspedalbetätigungsgeschwindigkeit wird insbesondere mittels eines Brake pedal actuation speed is in particular by means of a
Wegsensors ermittelt, welcher dem Bremspedal zugeordnet ist. Durch eine einfache Ableitung des Wegsignals über die Zeit ist die Displacement sensor determines which is assigned to the brake pedal. By a simple derivation of the path signal over time is the
Bewegungsgeschwindigkeit des Bremspedals berechenbar, sodass für dasMovement speed of the brake pedal calculable, so for the
Verfahren in kurzer Zeit entscheidbar ist, ob es sich bei einem erfassten Process in a short time is decidable, whether it is a recorded
Bremsvorgang beziehungsweise bei einer erfassten Bremspedalbetätigung um eine hoch-dynamische Betätigung oder um eine normale Betätigung handelt. Braking or a detected brake pedal operation to a highly dynamic operation or a normal operation is.
Weiterhin ist bevorzugt vorgesehen, dass eine hoch-dynamische Betätigung erkannt wird, wenn ein erfasster Bremspedalweg einen vorgebbaren dritten Grenzwert überschreitet. Insbesondere unabhängig zu der Berücksichtigung der Bremspedalbetätigungsgeschwindigkeit wird hierbei der Bremspedalweg mit einem dritten Grenzwert verglichen. Der dritte Grenzwert ist insbesondere derart gewählt, dass verhindert wird, dass Bremspedalbetätigungen, die zwar mit einer hohen Geschwindigkeit erfolgen, jedoch nur ein geringes Bremsmoment erfordern, nicht als hoch-dynamische Bremspedalbetätigungen erfasst werden. Furthermore, it is preferably provided that a highly dynamic actuation is detected when a detected brake pedal travel exceeds a predefinable third limit value. In particular, independently of the consideration of the brake pedal actuation speed, the brake pedal travel is compared here with a third limit value. In particular, the third limit value is selected to prevent brake pedal operations, which are performed at a high speed but require only a low braking torque, from being detected as high-dynamic brake pedal operations.
Weiterhin ist bevorzugt vorgesehen, dass der erste Grenzwert in Abhängigkeit von einer Betriebstemperatur des Druckerzeugers vorgegeben wird. Hierdurch wird der Vorteil erreicht, dass eine dynamische Ansteuerung des Druckerzeugers erfolgt, die von der aktuellen Betriebstemperatur des Druckerzeugers abhängt. Insbesondere wird die aktuelle Betriebstemperatur mit einer maximal zulässigen Betriebstemperatur verglichen, um zu bestimmen, ob die Temperatur weiter ansteigen darf oder nicht. Entsprechend wird der erste Grenzwert variiert, sodass das Überschreiten der Grenztemperatur sicher verhindert ist. Dabei wird davon ausgegangen, dass hoch-dynamische Bremsvorgänge die Betriebstemperatur nur kurzzeitig und damit vernachlässigbar erhöhen. Gemäß einer vorteilhaften Weiterbildung ist außerdem vorgesehen, dass dieFurthermore, it is preferably provided that the first limit value is predetermined as a function of an operating temperature of the pressure generator. As a result, the advantage is achieved that a dynamic control of the pressure generator takes place, which depends on the current operating temperature of the pressure generator. In particular, the current operating temperature is compared with a maximum allowable operating temperature to determine whether or not the temperature may continue to rise. Accordingly, the first limit value is varied, so that exceeding the limit temperature is reliably prevented. It is assumed that high-dynamic braking increases the operating temperature only briefly and thus negligibly. According to an advantageous development is also provided that the
Begrenzung des Betriebsstroms durch den ersten Grenzwert nur bei Drehzahlen unterhalb eines vierten Grenzwertes erfolgt. Hierdurch wird berücksichtigt, dass insbesondere bei niedrigen Drehzahlen das Drehmoment zum Antreiben des Druckerzeugers hoch ist, sodass gerade hier hohe Betriebsströme auftreten, die zu einer Erwärmung des Druckerzeugers, insbesondere dessen Elektromotors, führen. Arbeitet der Druckerzeuger in einem Drehzahlbereich mit hohen Limiting the operating current through the first limit only at speeds below a fourth limit occurs. This takes into account that, in particular at low rotational speeds, the torque for driving the pressure generator is high, so that in this case high operating currents occur which lead to heating of the pressure generator, in particular its electric motor. to lead. The pressure generator operates in a high speed range
Drehzahlen, in welchem ebenfalls ein hoher Betriebsstrom benötigt wird, ist jedoch aufgrund der hohen Drehzahl ein geringes Drehmoment erforderlich, sodass die Erwärmung geringer ausfällt und insofern die Begrenzung auf den ersten Grenzwert entfallen kann. However, because of the high rotational speed, a low torque is required for rotational speeds in which a high operating current is likewise required, so that the heating is lower and thus the limitation to the first limit value can be omitted.
Insbesondere ist vorgesehen, dass der erste Grenzwert in Abhängigkeit von einer zulässigen Betriebstemperatur des Druckerzeugers bei einer In particular, it is provided that the first limit value as a function of a permissible operating temperature of the pressure generator at a
Langzeitbremsung vorgegeben wird. In diesem Fall ist der erste Grenzwert insbesondere fix und nicht dynamisch vorgegeben und entspricht dem Long-term braking is specified. In this case, the first limit value is specified in particular fixed and not dynamic and corresponds to the
Betriebsstrom, der bei einer Langzeitbremsung maximal auftreten darf, ohne dass die Betriebstemperatur des Druckerzeugers den kritischen Wert Operating current, which may occur during a long-term braking maximum, without the operating temperature of the pressure generator, the critical value
überschreitet. exceeds.
Gemäß einer bevorzugten Weiterbildung der Erfindung ist vorgesehen, dass die Bremspedaleinrichtung in Abhängigkeit von der erfassten Art der According to a preferred embodiment of the invention it is provided that the brake pedal device in dependence on the detected type of
Bremspedalbetätigung eine Statusmeldung erzeugt und an ein den Brake pedal actuation generates a status message and to a
Druckerzeuger ansteuerndes Steuergerät sendet. Die Bremspedaleinrichtung sendet somit die Information, ob eine hoch-dynamische Bremspedalbetätigung erfolgt ist oder nicht, selbst an das Steuergerät, welches in Abhängigkeit von dieser Information den Druckerzeuger dann ansteuert beziehungsweise die Begrenzung durch den ersten Grenzwert aufhebt oder einstellt. Pressure generator activating control unit sends. The brake pedal device thus sends the information as to whether or not a high-dynamic brake pedal actuation has taken place, even to the control device, which then actuates the pressure generator in response to this information or suspends or adjusts the limit by the first limit value.
Die erfindungsgemäße Vorrichtung mit den Merkmalen des Anspruchs 8 zeichnet sich durch ein Steuergerät aus, das speziell dazu hergerichtet ist, bei The device according to the invention with the features of claim 8 is characterized by a control unit, which is specially adapted to, at
bestimmungsgemäßem Gebrauch das erfindungsgemäße Verfahren Proper use of the inventive method
durchzuführen. Es ergeben sich hierbei die bereits genannten Vorteile. perform. This results in the already mentioned advantages.
Das erfindungsgemäße Bremssystem mit den Merkmalen des Anspruchs 9 zeichnet sich durch die erfindungsgemäße Vorrichtung aus. Es ergeben sich hierdurch die bereits genannten Vorteile. The braking system according to the invention with the features of claim 9 is characterized by the device according to the invention. This results in the already mentioned advantages.
Weitere Vorteile und bevorzugte Merkmale und Merkmalskombinationen ergeben sich insbesondere aus dem zuvor beschriebenen sowie aus den Ansprüchen. Im Folgenden soll die Erfindung anhand der Zeichnung näher erörtert werden. Dazu zeigen Further advantages and preferred features and combinations of features emerge in particular from the previously described and from the claims. In the following, the invention will be discussed with reference to the drawing. Show this
Figur 1 ein hydraulisches Bremssystem eines Kraftfahrzeugs in einer schematischen Darstellung und Figure 1 shows a hydraulic brake system of a motor vehicle in a schematic representation and
Figur 2 ein Flussdiagramm zur Erläuterung eines vorteilhaften Figure 2 is a flowchart for explaining an advantageous
Verfahrens zum Betreiben des Bremssystems.  Method for operating the brake system.
Figur 1 zeigt in einer vereinfachten Darstellung ein Bremssystem 1 für ein hier nicht näher dargestelltes Kraftfahrzeug. Das Bremssystem 1 weist mehrere Radbremsen 2 auf, die von einem Fahrer des Kraftfahrzeugs durch eine Figure 1 shows a simplified representation of a brake system 1 for a motor vehicle not shown here in detail. The brake system 1 has a plurality of wheel brakes 2, which by a driver of the motor vehicle by a
Bremspedaleinrichtung 3 als Betriebsbremsen betätigbar sind. Die Radbremsen 2 sind dabei durch LR, RF, LF und RR bezeichnet, wodurch ihre Position beziehungsweise Zuordnung am Kraftfahrzeug erklärt wird, wobei LR für links hinten, RF für rechts vorne, LF für links vorne und RR für rechts hinten steht. Zwischen der Bremspedaleinrichtung 3 und den Radbremsen 2 sind zwei Bremskreise 4 und 5 ausgebildet, wobei der Bremskreis 4 den Radbremsen LF und RR und der Bremskreis 5 den Radbremsen LR und RF zugeordnet ist. Die beiden Bremskreise 4 und 5 sind identisch aufgebaut, sodass der Aufbau beider Bremskreise 4, 5 anhand des Bremskreises 4 im Folgenden näher erläutert werden soll. Brake pedal device 3 can be actuated as service brakes. The wheel brakes 2 are denoted by LR, RF, LF and RR, which explains their position or assignment on the motor vehicle, where LR stands for the left rear, RF for the right front, LF for the left front and RR for the right rear. Between the brake pedal device 3 and the wheel brakes 2 two brake circuits 4 and 5 are formed, wherein the brake circuit 4 the wheel brakes LF and RR and the brake circuit 5 is assigned to the wheel brakes LR and RF. The two brake circuits 4 and 5 are constructed identically, so that the structure of both brake circuits 4, 5 will be explained in more detail below with reference to the brake circuit 4.
Der Bremskreis 4 ist zunächst mit einem Hauptbremszylinder 6 der The brake circuit 4 is first with a master cylinder 6 of the
Bremspedaleinrichtung 3 verbunden, wobei der Hauptbremszylinder 6 vorliegend als Doppelkolbenzylinder oder Tandemzylinder ausgebildet ist, und wobei die Bremspedaleinrichtung 3 außerdem ein von dem Fahrer betätigbares Brake pedal device 3 is connected, wherein the master cylinder 6 is designed here as a double-piston or tandem cylinder, and wherein the brake pedal device 3 also actuated by the driver
Bremspedal 7 aufweist. Der Bremskreis 4 weist ein Umschaltventil 8 auf, das auf den Hauptbremszylinder 6 folgt. Das Umschaltventil 8 ist stromlos offen ausgebildet und erlaubt einen Fluss des Hydraulikmediums des Bremskreises, also der Bremsflüssigkeit, in beide Richtungen. Das Umschaltventil 8 ist weiterhin mit den beiden Radbremsen 2 unter Zwischenschaltung jeweils eines Has brake pedal 7. The brake circuit 4 has a switching valve 8, which follows the master cylinder 6. The switching valve 8 is designed to be normally open and allows a flow of the hydraulic medium of the brake circuit, so the brake fluid, in both directions. The switching valve 8 is further with the two wheel brakes 2 with the interposition of one
Einlassventils 10 verbunden, das stromlos in beide Richtungen geöffnet ausgebildet ist. Den Radbremsen 2 des Bremskreises 4 ist außerdem jeweils ein Auslassventil 11 zugeordnet, das stromlos geschlossen ausgebildet ist. Die Auslassventile 11 sind auslassseitig mit einem Hydrauliktank 9 verbunden, der den Hauptbremszylinder 6 mit Hydraulikmedium versorgt. Auslassseitig sind die Auslassventile 11 außerdem mit einer Saugseite einer Pumpe 13 verbunden, die druckseitig zwischen dem Umschaltventil 8 und den Einlassventilen 10 mit dem Bremskreis 4 verbunden ist. Die Pumpe 13 ist vorliegend als Kolbenpumpe ausgebildet und mechanisch mit einem Elektromotor 14 gekoppelt, wobei die Pumpe 13 und der Elektromotor 14 zusammen einen Druckerzeuger 15 des Bremssystems 1 bilden. Es ist vorgesehen, dass der Elektromotor 14 den Pumpen 13 beider Bremskreise 3, 4 und 5 zugeordnet ist. Alternativ kann auch vorgesehen sein, dass jeder Bremskreis 4, 5 einen eigenen Elektromotor 14 aufweist. Dem Hauptbremszylinder 6 ist außerdem ein hydraulischer Inlet valve 10 is connected, which is formed normally open in both directions. The wheel brakes 2 of the brake circuit 4 is also assigned in each case an exhaust valve 11, which is designed to be normally closed. The Exhaust valves 11 are connected on the outlet side with a hydraulic tank 9, which supplies the master cylinder 6 with hydraulic medium. On the outlet side, the outlet valves 11 are also connected to a suction side of a pump 13 which is connected on the pressure side between the changeover valve 8 and the inlet valves 10 to the brake circuit 4. The pump 13 is presently designed as a piston pump and mechanically coupled to an electric motor 14, wherein the pump 13 and the electric motor 14 together form a pressure generator 15 of the brake system 1. It is envisaged that the electric motor 14 is assigned to the pumps 13 of both brake circuits 3, 4 and 5. Alternatively, it can also be provided that each brake circuit 4, 5 has its own electric motor 14. The master cylinder 6 is also a hydraulic
Pedalgefühlsimulator 12 zugeordnet. Associated with pedal feel simulator 12.
Werden die beiden Umschaltventile 8 der Bremskreise 4, 5 geschlossen, so bleibt der Hydraulikdruck in dem dahinter liegenden Abschnitt der Bremskreise 4, 5, also zwischen den Umschaltventilen und den Radbremsen 2, eingesperrt beziehungsweise aufrechterhalten, auch dann, wenn das Bremspedal 7 durch den Fahrer entlastet wird. Zur Bremskraftverstärkung wird der Druckerzeuger 15 angesteuert, sodass zusätzlich zur Betätigung des Bremspedals 7 der If the two switching valves 8 of the brake circuits 4, 5 closed, the hydraulic pressure in the underlying section of the brake circuits 4, 5, ie between the switching valves and the wheel brakes 2, locked or maintained, even if the brake pedal 7 by the driver is relieved. For brake booster, the pressure generator 15 is driven, so that in addition to the operation of the brake pedal 7 of the
Hydraulikdruck durch den Druckerzeuger 15 in dem Bremssystem 1 automatisiert erhöht wird, sodass der Fahrer mit geringem Kraftaufwand ein hohes Hydraulic pressure is automatically increased by the pressure generator 15 in the brake system 1, so that the driver with little effort a high
Bremsmoment erzeugen kann. Can generate braking torque.
Figur 2 zeigt in ein vereinfachtes Flussdiagramm zur Erläuterung eines vorteilhaften Verfahrens zum Betreiben des Bremssystems. Mit Betätigung des Bremspedals 7 der Bremseinrichtung 3 wird im ersten Schritt Sl das Verfahren gestartet. In einer darauffolgenden Abfrage S2 wird geprüft, ob es sich bei der Bremspedalbetätigung um eine hoch-dynamische Bremspedalbetätigung handelt. Dazu werden die Betätigungsgeschwindigkeit sowie der Betätigungsweg des Bremspedals 7 erfasst und mit jeweils einem Grenzwert verglichen. FIG. 2 shows a simplified flowchart for explaining an advantageous method for operating the brake system. Upon actuation of the brake pedal 7 of the braking device 3, the method is started in the first step Sl. In a subsequent query S2, it is checked whether the brake pedal operation is a high-dynamic brake pedal operation. For this purpose, the actuation speed and the actuation travel of the brake pedal 7 are detected and compared with a respective limit value.
Überschreitet der erfasste Bremspedalweg den zugeordneten Grenzwert und ist die Betätigungsgeschwindigkeit höher als der entsprechende Grenzwert, so wird darauf erkannt, dass eine hoch-dynamischer Bremsbetätigung erfolgt (j). Ist die Betätigungsgeschwindigkeit jedoch geringer als der Grenzwert und/oder wird das Bremspedal nicht über den durch den zugehörigen Grenzwert erlaubten Pedalweg hinausbewegt, so wird darauf erkannt, dass keine hoch-dynamische Bremspedalbetätigung vorliegt (n) und zu einem Schritt S3 verwiesen. In diesem Schritt wird der Betriebsstrom für den Druckerzeuger 15 auf den zulässigen ersten Grenzwert begrenzt. If the detected brake pedal travel exceeds the assigned limit value and the actuation speed is higher than the corresponding limit value, it is recognized that a high-dynamic brake actuation occurs (j). However, if the actuation speed is less than the limit and / or the brake pedal is not allowed beyond the associated limit Pedal away, it is recognized that there is no high-dynamic brake pedal operation (s) and referenced to a step S3. In this step, the operating current for the pressure generator 15 is limited to the allowable first limit.
Damit ein Überhitzen des Druckerzeugers 15 beziehungsweise eines So that overheating of the pressure generator 15 or a
Elektromotors des Druckerzeugers 15 verhindert wird, ist vorgesehen, dass im Normalbetrieb der Betriebsstrom des Druckerzeugers durch einen ersten Grenzwert begrenzt wird. Dies soll anhand des in Figur 2 gezeigten Verfahrens näher erläutert werden. Electric motor of the pressure generator 15 is prevented, it is provided that in normal operation, the operating current of the pressure generator is limited by a first limit. This will be explained in more detail with reference to the method shown in FIG.
Mit dem so begrenzten Betriebsstrom wird dann der Druckerzeuger 15 im Schritt S4 zum Erzeugen des Hydraulikdrucks angesteuert. Wird im Schritt S2 jedoch erkannt, dass es sich bei der Bremspedalbetätigung um eine hoch-dynamische Bremspedalbetätigung handelt (j) so wird von dem Schritt S2 zu dem Schritt S4 weitergeleitet, sodass die Begrenzung des Betriebsstroms nicht erfolgt beziehungsweise aufgehoben wird. Hierdurch kann der Druckerzeuger 15 bei einem hoch-dynamischen Bremsvorgang mit einem erhöhten Betriebsstrom versorgt werden, sodass er auch bei niedrigen Drehzahlen ein hohes With the operating current thus limited, the pressure generator 15 is then activated in step S4 to generate the hydraulic pressure. However, if it is detected in step S2 that the brake pedal actuation is a high-dynamic brake pedal actuation (j), then the procedure advances from step S2 to step S4, so that the limitation of the operating current does not take place or is canceled. In this way, the pressure generator 15 can be supplied with an increased operating current in a highly dynamic braking process, so that it is a high even at low speeds
Drehmoment zur Verfügung stellt, sodass der Hydraulikdruck in dem Provides torque so that the hydraulic pressure in the
Bremssystem 1 in kürzester Zeit aufgebaut wird. Dadurch, dass die Begrenzung nur für hoch-dynamische Bremsvorgänge aufgehoben wird, ist im Normalbetrieb gewährleistet, dass die Betriebstemperatur nicht überschritten wird. Bei einem hoch-dynamischen Bremsvorgang ist die thermische Belastung abhängig von Höhe und Dauer des Betriebsstroms. Weil bei einer hoch-dynamischen Brake system 1 is built in a very short time. Due to the fact that the limitation is only canceled for high-dynamic braking operations, it is ensured in normal operation that the operating temperature is not exceeded. In a highly dynamic braking process, the thermal load depends on the amount and duration of the operating current. Because at a highly dynamic
Bremsung der Betriebsstrom nur für kurze Zeit hoch ausfällt, insbesondere solang noch niedrige Drehzahlen vorliegen, ist die Beeinträchtigung der Stopping the operating current only for a short time is high, especially as long as there are still low speeds, is the impairment of
Betriebstemperatur für diese kurze Zeit vernachlässigbar. Entsprechend wird die Erhöhung des Betriebsstroms über den ersten Grenzwert hinaus durch das beschriebene Verfahren vorteilhafterweise erlaubt. Dadurch erhöht sich das Drehmoment des Elektromotors 14 bei einem hoch-dynamischen Bremsvorgang wie bei einem normalen Bremsvorgang, wobei die genaue Höhe oder Operating temperature negligible for a short time. Accordingly, increasing the operating current beyond the first threshold is advantageously allowed by the described method. This increases the torque of the electric motor 14 in a highly dynamic braking operation as in a normal braking operation, the exact height or
Drehmomentsteigerung von der Dimensionierung des Elektromotors und der implementierten Stromgrenzen abhängt. Figur 3 zeigt hierzu beispielhaft in einem Diagramm die Drehmomentkennlinie des Elektromotors 14 des Druckerzeugers 15, als Druckmoment Md über Drehzahl n, im Normalbetrieb (Kl) und bei einem hoch-dynamischen Torque increase depends on the dimensioning of the electric motor and the implemented current limits. FIG. 3 shows by way of example in a diagram the torque characteristic of the electric motor 14 of the pressure generator 15, as the pressure moment Md over the speed n, in normal operation (K1) and in the case of a highly dynamic one
Bremsvorgang (K2). Es ist zu erkennen, dass bei dem hoch-dynamischen Bremsvorgang ein höheres Drehmoment als bei niedrigen Drehzahlen erlaubt ist, während bei höheren Drehzahlen oberhalb von 2000 Umdrehungen die Braking process (K2). It can be seen that in the highly dynamic braking operation, a higher torque than at low speeds is allowed, while at higher speeds above 2000 revolutions the
Kennlinien Kl und K2 übereinander liegen. Characteristics Kl and K2 lie one above the other.

Claims

Ansprüche claims
1. Verfahren zum Betreiben eines hydraulischen Bremssystems (1) eines 1. A method for operating a hydraulic brake system (1) one
Kraftfahrzeugs, aufweisend zumindest eine hydraulisch betätigbare  Motor vehicle, comprising at least one hydraulically actuated
Radbremse (2), eine Bremspedaleinrichtung (3) mit einem betätigbaren Bremspedal (7) zur Vorgabe eines Soll-Bremsmoments und einen  Wheel brake (2), a brake pedal device (3) with an actuated brake pedal (7) for specifying a desired braking torque and a
Druckerzeuger (15), der zur Erzeugung eines Hydraulikdrucks in  Pressure generator (15) for generating a hydraulic pressure in
Abhängigkeit von dem Soll-Bremsmoment elektrisch angesteuert wird, wobei ein elektrischer Betriebsstrom des Druckerzeugers (15) in einem  Depending on the desired braking torque is electrically controlled, wherein an electrical operating current of the pressure generator (15) in one
Normalbetrieb auf einen ersten vorgebbaren Grenzwert begrenzt wird, dadurch gekennzeichnet, dass die Bremspedaleinrichtung (3) auf die Art der Betätigung des Bremspedals (7) überwacht wird, und dass bei Erfassen einer hoch-dynamischen Betätigung des Bremspedals (7) die Begrenzung des Betriebsstroms aufgehoben wird.  Normal operation is limited to a first predetermined limit, characterized in that the brake pedal device (3) on the type of operation of the brake pedal (7) is monitored, and that upon detection of a highly dynamic operation of the brake pedal (7) repealed the limitation of the operating current becomes.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass eine hochdynamische Betätigung erkannt wird, wenn eine erfasste 2. The method according to claim 1, characterized in that a highly dynamic operation is detected when a detected
Bremspedalbetätigungsgeschwindigkeit einen vorgebbaren zweiten  Brake pedal actuation speed a predetermined second
Grenzwert überschreitet.  Exceeds limit.
3. Verfahren nach einem der vorhergehenden Ansprüche, dadurch 3. The method according to any one of the preceding claims, characterized
gekennzeichnet, dass eine hoch-dynamische Betätigung erkannt wird, wenn ein erfasster Bremspedalweg einen vorgebbaren dritten Grenzwert überschreitet.  in that a highly dynamic actuation is detected when a detected brake pedal travel exceeds a predefinable third limit value.
4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch 4. The method according to any one of the preceding claims, characterized
gekennzeichnet, dass der erste Grenzwert in Abhängigkeit von einer Betriebstemperatur des Druckerzeugers vorgegeben wird.  in that the first limit value is predefined as a function of an operating temperature of the pressure generator.
5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch 5. The method according to any one of the preceding claims, characterized
gekennzeichnet, dass die Begrenzung durch den ersten Grenzwert nur bei Drehzahlen unterhalb eines vierten Grenzwerts erfolgt. Verfahren nach einem der vorhergehenden Ansprüche, dadurch characterized in that the limitation by the first limit only occurs at speeds below a fourth limit. Method according to one of the preceding claims, characterized
gekennzeichnet, dass der erste Grenzwert in Abhängigkeit von einer zulässigen Betriebstemperatur des Druckerzeugers (15) bei einer in that the first limit value depends on a permissible operating temperature of the pressure generator (15) at a
Langzeitbremsung vorgegeben wird. Long-term braking is specified.
Verfahren nach einem der vorhergehenden Ansprüche, dadurch Method according to one of the preceding claims, characterized
gekennzeichnet, dass die Bremspedaleinrichtung (3) in Abhängigkeit von der erfassten Art der Bremspedalbetätigung eine Statusmeldung erzeugt und an ein den Druckerzeuger (15) ansteuerndes Steuergerät sendet. in that the brake pedal device (3) generates a status message as a function of the detected type of brake pedal actuation and transmits it to a control device which activates the pressure generator (15).
Vorrichtung zum Betreiben eines Bremssystems (1) eines Kraftfahrzeugs, wobei das Bremssystem (1) wenigstens eine Radbremse (2), eine Device for operating a brake system (1) of a motor vehicle, wherein the brake system (1) at least one wheel brake (2), a
Bremspedaleinrichtung (3) mit einem betätigbaren Bremspedal (7) zur Vorgabe eines Soll-Bremsmoments und zumindest einen Druckerzeuger (15) zur hydraulischen Betätigung der Radbremse (2) aufweist, wobei der Druckerzeuger (15) in Abhängigkeit von einer Betätigung des Bremspedals (7) angesteuert wird, gekennzeichnet durch ein Steuergerät, das speziell dazu hergerichtet ist, bei bestimmungsgemäßem Gebrauch das Verfahren nach einem oder mehreren der Ansprüche 1 bis 7 durchzuführen. Has a brake pedal device (3) with an actuatable brake pedal (7) for specifying a desired braking torque and at least one pressure generator (15) for the hydraulic actuation of the wheel brake (2), wherein the pressure generator (15) in response to an actuation of the brake pedal (7) is controlled, characterized by a control unit, which is specially adapted to carry out the method according to one or more of claims 1 to 7 when used as intended.
Bremssystem (1) für ein Kraftfahrzeug, mit wenigstens einer Radbremse (2), einer Bremspedaleinrichtung (3) und zumindest einem Druckerzeuger (15) zur hydraulischen Betätigung der Radbremse (2), wobei der Druckerzeuger (15) in Abhängigkeit von einer Betätigung des Bremspedals (7) angesteuert wird, gekennzeichnet durch eine Vorrichtung nach Anspruch 8. A braking system (1) for a motor vehicle, comprising at least one wheel brake (2), a brake pedal device (3) and at least one pressure generator (15) for hydraulically actuating the wheel brake (2), wherein the pressure generator (15) in response to an actuation of the brake pedal (7), characterized by a device according to claim 8.
EP17718351.4A 2016-06-20 2017-04-12 Method and device for operating a brake system, brake system Withdrawn EP3472007A1 (en)

Applications Claiming Priority (2)

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DE102016210945.6A DE102016210945A1 (en) 2016-06-20 2016-06-20 Method and device for operating a brake system, brake system
PCT/EP2017/058823 WO2017220229A1 (en) 2016-06-20 2017-04-12 Method and device for operating a brake system, brake system

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DE102022209017B4 (en) 2022-08-31 2024-03-28 Volkswagen Aktiengesellschaft Method for activating functions of a motor vehicle and motor vehicle

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