Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
  • F16D65/00—Parts or details
  • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
  • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
  • F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
  • B60T8/17—Using electrical or electronic regulation means to control braking
  • B60T8/174—Using electrical or electronic regulation means to control braking characterised by using special control logic, e.g. fuzzy logic, neural computing
• • 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
  • B60T13/58—Combined or convertible systems
  • B60T13/588—Combined or convertible systems both fluid and mechanical assistance or drive
• • 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
• • 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
  • B60T13/741—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 an ultimate actuator
• • 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
  • 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
  • B60T7/045—Brake-action initiating means for personal initiation foot actuated with locking and release means, e.g. providing parking brake application
• • 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
  • B60T7/08—Brake-action initiating means for personal initiation hand actuated
  • B60T7/10—Disposition of hand control
  • B60T7/107—Disposition of hand control with electrical power assistance

Definitions

• the invention relates to a method for adjusting the force exerted by a parking brake clamping force in a vehicle.
• an electromechanical parking brake which has as an actuator an electric brake motor, upon actuation of a brake piston with a brake pad is pressed axially against a brake disc.
• the amount of clamping force is influenced by the current supplied to the brake motor.
• the invention has for its object to reduce the load in an electromechanical parking brake, which cooperates with an additional brake device.
• the method according to the invention relates to an electromechanical parking brake in a vehicle, which has as an actuator an electric actuator, via which a clamping force for setting the vehicle at standstill can be generated.
• the actuator is preferably an electric brake motor, the rotational movement of which is converted into an axial adjusting movement of a brake piston, which carrier is a brake pad which is pressed against the end face of a brake disc.
• an electric brake motor as a brake actuator is an advantageous embodiment.
• other electrically adjustable actuators come into consideration, for example, electromagnetic actuators that perform a mechanical adjustment when applying an electrical voltage, through which the brake piston with the brake pad against the brake disc is pressed.
• the auxiliary brake device is advantageously the hydraulic vehicle brake, whose hydraulic pressure acts in a supportive manner on the brake piston.
• the electromechanical brake device can provide the required clamping force without the assistance of the additional brake device.
• a braking force is generated via the additional brake device without request by the parking brake or a parking brake associated control unit, this can be taken into account for the clamping force to be set.
• a form can be generated, which can make a share of the clamping force.
• the actual force curve of the electromechanical clamping force is determined according to the invention during the Zustellvorganges and compared with a characteristic force curve.
• a supplementary auxiliary braking force is currently generated in the auxiliary brake device, which can be used in addition to the electromechanical clamping force.
• There- by the proportion of the electromechanical clamping force can be reduced to the total clamping force to be set, whereby the load in the electromechanical braking device is reduced.
• Another advantage of the method according to the invention is that by exploiting the additional braking force which is generated in the auxiliary brake device, positioning times and also the noise development during the actuation of the parking brake are reduced.
• characteristic curves may be specified as characteristic force profiles with which the actual, measured force curve is compared.
• Each characteristic can be assigned a force level of the auxiliary brake device, which is optionally taken into account as a supporting clamping force.
• Clamping force can be determined, for example, based on the current profile of the electrical actuator.
• the voltage or speed curve or any combination of these variables can also be used for the determination of the clamping force profile.
• the force rise point represents a striking and relatively accurately determinable point in the force curve.
• the force curve of the auxiliary brake device is used as a characteristic, defined force curve.
• the about motor state variables such as electricity or
• Voltage of the electric actuator determinable force curve corresponds at least substantially and at least in sections to the basic force curve of the auxiliary brake device.
• play and elasticity of the auxiliary brake device which have an effect on the force profile line thereof, also influence the force curve, which is determined via the engine state variables of the electric brake device. In this way it can be concluded from the actual force curve on the current state of the auxiliary brake device.
• the hydraulic brake characteristic spring stiffness and play which is reflected for example in the pressure-volume curve of the hydraulic vehicle brake in different grades. In a first pressure range, first the clearance of the hydraulic brake must be overcome by as long hydraulic volume is conveyed until the brake pads abut against the brake disc. In this area there is a steep volume increase, based on the pressure.
• second area shows the compressibility of the brake pads and elastomers, such as an anti-noise coating in the hydraulic brake system; in this second area the transition takes place from a progressively increasing volume per unit pressure to an approximately constant increasing volume.
• an elastic deformation takes place, for example, a bending of the fingers of the brake caliper, which engages over the brake disc.
• the course of the volume as a function of the pressure is at least approximately linear.
• the different ranges from the volume-pressure curve can be converted into a force-displacement curve, wherein in particular the force increase range for each section of the volume-pressure curve has a characteristic course.
• the determination of the actual force curve during the delivery of the parking brake and the comparison with the characteristic curve allows the above-described estimate of the applied braking force of the auxiliary brake device and the consideration in generating the total clamping force.
• the inventive method runs in a control or control unit in the vehicle, which may be part of the parking brake system.
• FIG. 1 shows a section through an electromechanical parking brake for a vehicle, in which the clamping force is generated by an electric brake motor
• 3 is a volume-pressure characteristic of a hydraulic vehicle brake, which is divided into three different areas,
• FIG. 4 is associated with the first region, FIG. 5 with the second region, and FIG. 6 with the third region from the characteristic curve according to FIG. 3.
• Fig. 1 is an electromechanical parking brake 1 for setting a
• the parking brake 1 comprises a caliper 2 with a pair of pliers 9, which engages over a brake disk 10.
• the parking brake 1 an electric motor as a brake motor 3, which drives a spindle 4 in rotation, on which a spindle member 5 is rotatably mounted.
• the spindle member 5 Upon rotation of the spindle 4, the spindle member 5 is moved axially.
• the spindle component 5 moves within a brake piston 6, which is the carrier of a brake pad 7, which is pressed by the brake piston 6 against the brake disk 10.
• On the opposite side of the brake disk 10 is another brake pad 8, which is held stationary on the pliers 9.
• the spindle member 5 during a rotational movement of the spindle 4 axially forward in the direction of the brake disc 10 to move or at an opposite rotational movement of the spindle 4 axially to the rear until reaching a stop 1 1.
• the spindle member 5 acts on the inner end face of the brake piston 6, whereby the axially displaceable mounted in the parking brake 1 brake piston 6 is pressed with the brake pad 7 against the facing end face of the brake disc 10.
• the parking brake can be supported if necessary by a hydraulic vehicle brake, so that the clamping force composed of an electromotive component and a hydraulic component. In the case of hydraulic assistance, the rear side of the brake piston 6 facing the brake motor is subjected to pressurized hydraulic fluid.
• Fig. 2 is a graph showing the current waveform I, the voltage U and the speed curve n of the electric brake motor time-dependent for a Zuspannvorgang.
• the application process begins by applying an electrical voltage and energizing the brake motor when the circuit is closed.
• the voltage U and the engine speed n have reached their maximum.
• the phase between t2 and t3 represents the idle phase in which the current I moves to a minimum level. This is followed by the force build-up phase from the time t3 to the time t4, in which the brake pads bear against the brake disc and are pressed with increasing clamping force F against the brake disc.
• the switching off of the electric brake motor takes place by opening the electric circuit, so that in the further course the speed n of the brake motor drops to zero.
• the force build-up or the course of the clamping force F can be determined, for example, based on the course of the current I of the brake motor, which basically has the same course as the electromechanical clamping force. Starting from the low level during the idle phase between t2 and t3, the current profile increases steeply at the beginning of time t3. This increase in current can be detected and used to determine the force rise point. In principle, however, the course of the force build-up can also be determined from the voltage or speed curve or from any combination of the signals current, voltage and rotational speed.
• the current waveform is shown time-dependent.
• the time-dependent progression can be converted into a path-dependent progression;
• Fig. 3 is a volume-pressure characteristic of the hydraulic vehicle brake for representing the characteristic spring stiffness of the hydraulic brake, taking into account the spring characteristics of the brake pads of the brake disc shown.
• the characteristic curve can be subdivided into three areas I, II and III depending on the pressure.
• the first region I applies to a low pressure interval between zero bar and, for example, three bar, in this interval the volume increases sharply.
• area I the clearance of the hydraulic brake is overcome, it must be nachgeschoben as long hydraulic volume until the brake pads rest against the brake disc.
• Region I is followed by region II, which extends, for example, up to a hydraulic pressure of 60 bar and represents an n-th order curve. bar is.
• region II the compressibility of the brake pads and elastomers used in the brake system, for example, an anti-noise coating comes into play.
• region III which is characterized by a linear-elastic
• FIGS. 4 to 6 each show a force-displacement curve of the force exerted by the parking brake clamping force, which is shown in each case over the travel.
• the force curve according to FIG. 4 is assigned to the region I from FIG. 3, the force curve according to FIG. 5 to the region II and the force curve according to FIG. 6 to the region III.
• the force curves in FIGS. 4 to 6 are exemplary of an actual force curve of the clamping force exerted by the parking brake, which can be determined as described above, for example via the electromotive state variables current I, voltage U and / or rotational speed n.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Transportation (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fuzzy Systems (AREA)
• Mathematical Physics (AREA)
• Software Systems (AREA)
• Theoretical Computer Science (AREA)
• Braking Arrangements (AREA)
• Braking Systems And Boosters (AREA)
• Regulating Braking Force (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=45217543

Family Applications (1)

Country Status (7)

Families Citing this family (11)

Family Cites Families (9)

• 2010
  • 2010-12-17 DE DE102010063365.8A patent/DE102010063365B4/de active Active
• 2011
  • 2011-12-05 KR KR1020137015493A patent/KR101941303B1/ko active IP Right Grant
  • 2011-12-05 EP EP11793411.7A patent/EP2651731A1/de not_active Withdrawn
  • 2011-12-05 WO PCT/EP2011/071767 patent/WO2012080023A1/de active Application Filing
  • 2011-12-05 JP JP2013543639A patent/JP5816295B2/ja not_active Expired - Fee Related
  • 2011-12-05 US US13/994,524 patent/US9272692B2/en active Active
  • 2011-12-05 CN CN201180060259.XA patent/CN103237701B/zh active Active

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events