GB2478348A - Control of the gap between a brake pad and disc - Google Patents
Control of the gap between a brake pad and disc Download PDFInfo
- Publication number
- GB2478348A GB2478348A GB1003662A GB201003662A GB2478348A GB 2478348 A GB2478348 A GB 2478348A GB 1003662 A GB1003662 A GB 1003662A GB 201003662 A GB201003662 A GB 201003662A GB 2478348 A GB2478348 A GB 2478348A
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- GB
- United Kingdom
- Prior art keywords
- brake
- bar
- distance
- pressure
- pad
- 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
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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
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
- B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake 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
- B60T7/00—Brake-action initiating means
- B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/48—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
- B60T8/4809—Traction control, stability control, using both the wheel brakes and other automatic braking systems
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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
- B60T8/48—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
- B60T8/4809—Traction control, stability control, using both the wheel brakes and other automatic braking systems
- B60T8/4827—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems
- B60T8/4863—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems
- B60T8/4872—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems pump-back systems
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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
- B60T2201/00—Particular use of vehicle brake systems; Special systems using also the brakes; Special software modules within the brake system controller
- B60T2201/12—Pre-actuation of braking systems without significant braking effect; Optimizing brake performance by reduction of play between brake pads and brake disc
-
- 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
- B60T2201/12—Pre-actuation of braking systems without significant braking effect; Optimizing brake performance by reduction of play between brake pads and brake disc
- B60T2201/122—Pre-actuation in case of ESP control
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Regulating Braking Force (AREA)
Abstract
A brake pad 16 is positioned at a distance d with respect to a brake disc 14. A predefined prefill pressure is applied to the brake pad 16 for reducing the distance between the pad 16 and disc 14 by a distance d1 by means of an ESC system (electronic brake control modulator) 24 after each detection of a normal brake wish. A normal actuating pressure is applied to the brake pad 16 for reducing the distance between the pad 16 and disc 14 further, wherein the normal actuating pressure is lower than the prefill pressure. Due to the increased prefill pressure compared to common brake systems the brake pad 16 of the brake 12 can be moved by an increased distance towards the brake disc 14 at the beginning of an actuating of the brake 12 without a changed brake feeling for the driver of the vehicle during the brake mode. Due to the increased clearance between the pad 16 and disc 14 the risk of unintended brake friction is reduced or even eliminated. Energy losses and/or drag torque by means of the brake 12 are reduced.
Description
Method for controlling a brake and brake system with reduced energy losses as well as computer program product, software and signal sequence for carrying out the method Des c r ipt ion The invention relates to a method for controlling a brake and a brake system as well as a computer program product, a software and a signal sequence for carrying out the method, by means of which a vehicle may be decelerated.
It is known to use an ESC system ("electronic stability control system") for providing an increased actuating pressure for actuating a brake of a vehicle in the non-normal case that a full braking and/or an emergency braking is detected.
There is a permanent need for reducing energy losses by friction during drive mode, when no decelerating by intended braking is present.
It is the object of the invention to provide a method for controlling a brake and a brake system as well as a computer program product, a software and a signal sequence, by means of which energy losses, particularly during drive mode, can be reduced.
The solution of the object is achieved by a method for controlling a brake with the features of claim 1, by a brake system with the features of claim 7, by a computer program product with the features of claim 11, by a software with the features of claim 12 and by a signal sequence with the features of claim 13. Preferred embodiments are given by the dependent claims.
The method according to the invention for controlling a brake for decelerating a vehicle, comprises the steps of positioning a brake pad at a distance d with respect to a brake disc, applying a predefined prefill pressure to the brake pad for reducing the distance between the brake pad and the brake disc by a distance d1 by means of an ESC system after each detection of a normal brake wish, and applying a normal actuating pressure to the brake pad for reducing the distance between the brake pad and the brake disc further, wherein the normal actuating pressure is at least momentary lower than the prefill pressure.
Due to the increased prefill pressure compared to common brake systems the brake pad of the brake can be moved by an increased distance towards the brake disc at the beginning of an actuating of the brake without a changed brake feeling for the driver of the vehicle during the brake mode. The vehicle may comprise a combustion engine and/or an electrical motor. During drive mode the brake pedal is not actuated yet. Brake mode starts, when a brake wish is detected. Due to the increased clearance between the brake pad and the brake disc the risk that unintended friction occurs between the brake pad and the brake disc for example due to collected dirt or an misalignment of the brake pad with respect to the brake disc is reduced or even eliminated. Energy losses and/or drag torque by means of the brake are reduced leading to a higher energy efficiency of the vehicle and reduced fuel consumption as well as reduced C02-emission. For providing the intended prefill pressure for compensating the increased clearance between the brake pad and the brake disc an already provided ESC system can be used. In contrast to the usual intended use of the ESO system the function of the ESO system of providing an increased pressure for actuating the brake in the case of a full braking and/or an emergency braking is used at each brake wish. This means the prefill function of the ESC system is used not only in the case of a full braking and/or an emergency braking but in every case of an intended brake initiated by the driver.
In contrast to the situation of a detected full braking and/or emergency braking the applied pressure is reduced after moving the brake pad along the distance d1 towards the brake disc without meeting the brake disc to a lower normal actuating pressure for preventing a hard braking and maintaining a comfortable brake feeling. In the case that a non-normal brake wish is detected, particularly a full braking and/or an emergency braking, the pressure reduction from the prefill pressure to the normal actuating pressure can be overridden by the control strategy of the ESC-system for managing such kind of non-normal brake situations. Only a suitable adapted controller and/or suitable programmed software of the ESC system is necessary for implementing the method according to the invention into an already existing motor vehicle design.
The prefill pressure can be provided by means of a pump within a hydraulic control unit comprising the ESC-system for actuating the brake, wherein the increased pressure is not applied to the brake but only when a brake wish, for instance a pressing of the brake pedal, is detected. The brake is particularly designed as disc -4-.
brake comprising a caliper, wherein the caliper comprises at least one brake pad, which can be pressed against the brake disc for decelerating the vehicle. The ESC system particularly comprises a brake assist system, which can be utilized for providing the prefill pressure. If so, the applicable pressure can be higher than the prefill pressure, which is required for compensating the increased clearance between the brake pad and the brake disc for maintaining a normal brake feeling for the driver, for instance, when a high braking effect is required like in the case of a full braking and/or an emergency braking.
Particularly the predefined prefill pressure is higher than the normal actuating pressure by a pressure difference zp of 0.5 bar «= p «= 5.0 bar, particularly 0.8 bar «= Ap «= 3.0 bar and preferably 1.0 bar «= Ap «= 2.0 bar. The pressure increase with respect to a usual provided actuating pressure is sufficient for compensating an increased distance of the brake pad towards the brake disc. Such a pressure difference ip can be handled by a usual pump motor within the hydraulic control unit and/or within the ESC system.
The prefill pressure can be preferably provided hydraulically.
Preferably a brake wish is detected by monitoring the force and/or velocity of actuating the brake pedal.
Depending on the measured force and/or velocity it can be decided whether a normal brake wish or a non-normal brake wish, particularly a full braking and/or emergency braking, is present.
Particularly the actuating pressure may be additionally increased above the prefill pressure by means of the ESC system, when a full braking and/or an -5-.
emergency braking is detected. A full braking and/or an emergency braking may particularly be detected by monitoring the time for shifting the actuation of an accelerator pedal to an actuation of a brake pedal and/or monitoring the velocity of releasing the accelerator pedal and/or monitoring the velocity of pressing the brake pedal and/or monitoring the force applied to the brake pedal. Although the ESC system can be used for every intended brake event, the ESC system can still be used for the usual purpose for providing additional brake force in the case of a full braking and/or an emergency braking. The function of the ESC system and/or the function of a brake assist system are not hampered.
It is possible to detect a full braking and/or an emergency braking even before the driver hit the brake pedal by monitoring the movement of the accelerator pedal. Additional braking pressure can be applied in line with the control strategy of the ESC system, wherein the additional braking pressure can be applied at a later time, for instance after the presence of a full braking and/or an emergency braking is verified. In a situation, when a full braking and/or an emergency braking is estimated, it is possible to compensate the increased distance between the brake pad and the brake disc in order to provide a very fast braking, if required in the actual situation. The effect of reduced energy losses is provided without reducing the safety and/or slowing the braking process.
In a preferred embodiment the distance d1 is 0.05 mm «= d1 «= 1.0 mm, particularly 0.10 rtun «= d1 «= 0.6 mm, preferably 0.13 mm «= di «= 0.4 mm and further preferred 0.15 mm «= d1 «= 0.2 mm. The residual distance d -d1 may be for instance 0.2 mm «= d -d1 «= 0.8 mm, particularly 0.25 mm «= d -d1 «= 0.7 mm, preferably 0.30 mm «= d -d1 «= 0.6 mm and further preferred 0.35 mm «= d -d1 «= 0.4 mm. Such distances d and/or d1 are sufficient for preventing an unintended sliding of the brake pad on the brake disc. Unwanted friction between the brake pad and the brake disc is reduced. Further only a comparatively small increased prefill pressure is sufficient for compensating the increased distance between the brake pad and the brake disc without changing the brake pedal feeling for a driver.
Particularly the normal actuating pressure p is bar «= P «= 50 bar, particularly 15 bar «= P «= 45 bar, preferably 20 bar «= P «= 40 bar and most preferred 25 bar «= P «= 35 bar. Preferably the normal actuating pressure is chosen significantly lower than an ABS-pressure at which an antilock braking system (ABS) may be activated.
The invention further relates to a brake system for decelerating a vehicle, comprising a brake disc for being connected to a wheel shaft, a brake pad for being pressed towards the brake disc, wherein the brake pad is positioned at a distance d with respect to the brake disc during drive mode, and an ESC system comprising a controller for applying a predefined prefill pressure to the brake pad for reducing the distance between the brake pad and the brake disc by a distance d1 after each detection of a normal brake wish, and for applying a normal actuating pressure to the brake pad for reducing the distance between the brake pad and the brake disc further, wherein the normal actuating pressure is lower than the prefill pressure. The brake system can be further designed as previously described with respect to the method for controlling a brake. Due to the increased prefill pressure compared to common brake systems the brake pad of the brake can be moved by an increased distance towards the brake disc at the beginning of an actuating of the brake without a changed brake feeling for the driver of the vehicle during the brake mode. Due to the increased clearance between the brake pad and the brake disc the risk that unintended friction occurs between the brake pad and the brake disc is reduced or even eliminated. Energy losses and/or drag torque by means of the brake are reduced.
Preferably the predefined prefill pressure is higher than the normal actuating pressure by a pressure difference Ap of 0.5 bar «= Ap «= 5.0 bar, particularly 0.8 bar «= Ap «= 3.0 bar and preferably 1.0 bar «= Ap «= 2.0 bar. The pressure increase with respect to a usual provided actuating pressure is sufficient for compensating an increased distance of the brake pad towards the brake disc. Such a pressure difference Ap can be handled by a usual pump motor within the hydraulic control unit and/or within the ESC system.
The prefill pressure can be preferably provided hydraulically.
Particularly the distance d between the brake pad and the brake disc during drive mode is 0.25 mm «= d «= 1.8 mm, particularly 0.35 mm «= d «= 1.3 mm, preferably 0.43 mm «= d «= 1.0 mm and further preferred 0.50 mm d «= 0.6 mm. Such distance d is sufficient for preventing an unintended sliding of the brake pad on the brake disc. Unwanted friction between the brake pad and the brake disc is reduced. Further only a comparatively small increased prefill pressure is sufficient for compensating the increased distance between the brake pad and the brake disc without changing the brake pedal feeling for a driver.
In a preferred embodiment the distance d1 is 0.05 mm «= di «= 1.0 mm, particularly 0.10 mm «= d1 «= 0.6 mm, preferably 0.13 mm «= d1 «= 0.4 mm and further preferred 0.15 mm «= d1 «= 0.2 mm. The residual distance d -d1 may be for instance 0.2 mm «= d -d1 «= 0.8 mm, particularly 0.25 mm «= d -di «= 0.7 mm, preferably 0.30 mm «= d -d1 «= 0.6 mm and further preferred 0.35 mm «= d -d1 «= 0.4 mm. Such distances d and/or d1 are sufficient for preventing an unintended sliding of the brake pad on the brake disc. Unwanted friction between the brake pad and the brake disc is reduced.
The invention further relates to a vehicle comprising a brake system for decelerating the vehicle, wherein the brake system can be designed as previously described. The brake system is particularly adapted for carrying out the above mentioned method for controlling a brake. Due to the increased prefill pressure compared to common brake systems the brake pad of the brake can be moved by an increased distance towards the brake disc at the beginning of an actuating of the brake without a changed brake feeling for the driver of the vehicle during the brake mode. Due to the increased clearance between the brake pad and the brake disc the risk that unintended friction occurs between the brake pad and the brake disc is reduced or even eliminated. Energy losses and/or drag torque by means of the brake are reduced.
The invention further relates to a computer program product comprising program code means stored on a computer readable medium for carrying out the above mentioned method, when the computer program product is executed by a computer, particularly a controller of a brake system, which can be designed as previously described. Due to the computer program product an increased prefill pressure compared to common brake systems is enabled, which allows moving the brake pad of the brake by an increased distance towards the brake disc at the beginning of an actuating of the brake without a changed brake feeling for the driver of the vehicle during the brake mode. Due to the increased clearance between the brake pad and the brake disc the risk that unintended friction occurs between the brake pad and the brake disc is reduced or even eliminated. Energy losses and/or drag torque by means of the brake are reduced.
The invention further relates to a software comprising coded instructions for carrying out the above mentioned method, when the software is executed by a computer, particularly a controller of a brake system, which can be designed as previously described. Due to the executed software an increased prefill pressure compared to common brake systems is enabled, which allows moving the brake pad of the brake by an increased distance towards the brake disc at the beginning of an actuating of the brake without a changed brake feeling for the driver of the vehicle during the brake mode. Due to the increased clearance between the brake pad and the brake disc the risk that unintended friction occurs between the brake pad and the brake disc is reduced or even eliminated. Energy losses and/or drag torque by means of the brake are reduced. Particularly the software can be stored on a computer program product as previously described, particularly portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a portable compact disc read-only memory (CD-ROM), a digital versatile disc (DVD), an optical storage device and/or a magnetic storage device.
The coded instructions can be transmitted using wireless, wireline, optical fiber cable and/or electromagnetic -10 -radiation, particularly radio frequency (RF) radiation.
The software can be particularly provided as a compiled or not compiled data sequence preferably based on a object oriented programming language such as C, C++, Java, Smalitalk, Pascal, Turbo Pascal. The coded instructions of the software may be executed entirely on a computer device, partly on the computer device, as a stand-alone software package, partly on the computer device and partly on a remote computer or entirely on the remote computer or server. The remote computer may be connected to the computer device through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer for example, through the internet using an internet service provider.
The invention further relates to a signal sequence comprising computer readable instructions for carrying out the above mentioned method, when the signal sequence is processed by a computer, particularly a controller of a brake system, which can be designed as previously described. Due to the processed signal sequence an increased prefill pressure compared to common brake systems is enabled, which allows moving the brake pad of the brake by an increased distance towards the brake disc at the beginning of an actuating of the brake without a changed brake feeling for the driver of the vehicle during the brake mode. Due to the increased clearance between the brake pad and the brake disc the risk that unintended friction occurs between the brake pad and the brake disc is reduced or even eliminated. Energy losses and/or drag torque by means of the brake are reduced. The signal sequence can particularly be generated by means of the above mentioned computer program product and/or the above mentioned software. The signal sequence can be embodied as electric pulses, electromagnetic wave, as -11 -part of a carrier wave and/or as optical pulses, which can be transmitted using wireless, wireline, optical fiber cable and/or electromagnetic radiation, particularly radio frequency (RF) radiation.
These and other aspects of the invention will be apparent from and elucidated with reference to a preferred embodiment described hereinafter.
In the drawings: Fig. 1 is a schematic conceptual view of a brake system.
IS The brake system 10 as illustrated in Fig. 1 comprises a brake 12. The brake 12 comprises a brake disc 14, a brake caliper 20, a caliper piston 18 and a brake pad 16. The brake disc 14 can be connected to a wheel shaft 22. The brake pad 16 is arranged at a distance d spaced to the brake disc 14 for reducing the risk of unintended friction between the brake disc 14 and the brake pad 16. An ESC system (electronic brake control modulator) 24 comprises a hydraulic control unit 26 having a pump and a hydraulic circuit, a pump motor 28, an electronic control unit 30, and a controller 32 comprising a suitable software. By means of the software the controller 32 may generate a signal sequence by means of which the brake system 10 can be operated.
The brake pad 16 can be moved towards the brake disc 14 be means of the caliper piston 18 in the brake caliper 20. The pressure in the hydraulic control unit 26 can be build up with the pump motor 28. By means of the ESC system 24 the brake pad 16 can be moved. For that purpose the ESC system 24 is connected to the caliper piston 18 within the brake caliper 24. The ESC system 24 is further -12 -connected to an accelerator pedal 34 and/or a brake pedal 36 for detecting a brake wish and/or the presence of a full braking and/or an emergency braking. The information of the movement of the accelerator pedal 34 and/or a brake pedal 36 is processed by means of the controller 32 of the ESC system 24, which particularly comprises a brake assist system. The controller 32 sends instructions to the electronic control unit 30, after that an increased prefill pressure is provided inside the hydraulic control unit 26 via the pump motor 28 for compensating very fast a larger part of the distance d between the brake pad 16 and the brake disc 14 in the case of an intended brake without hampering the brake pedal feeling for a driver of a vehicle comprising the IS brake system 10.
Re fe rence signs brake system 12 brake 14 brake disc 16 brake pad 18 caliper piston brake caliper 22 wheel shaft 24 ESC system 26 hydraulic control unit 28 pump motor electronic control unit 32 controller 34 accelerator pedal 36 brake pedal 14 1
Claims (13)
- Claims 1. Method for controlling a brake (12) for decelerating a vehicle, comprising the steps of positioning a brake pad (16) of the brake (12) at a distance d with respect to a brake disc (14) of the brake (12), applying a predefined prefill pressure to the brake pad (16) for reducing the distance between the brake pad (16) and the brake disc (14) by a distance d1 by means of an ESC system (24) after each detection of a normal brake wish, and Is applying a normal actuating pressure to the brake pad (16) for reducing the distance between the brake pad (16) and the brake disc (14) further, wherein the normal actuating pressure is at least momentary lower than the prefill pressure.
- 2. Method according to claim 1 wherein the predefined prefill pressure is higher than the normal actuating pressure by a pressure difference of 0.5 bar «= Ap «= 5.0 bar, particularly 0.8 bar «= zp «= 3.0 bar and preferably 1.0 bar «= Ap «= 2.0 bar.
- 3. Method according to claim 1 or 2 wherein a brake wish is detected by monitoring the force and/or velocity of actuating a brake pedal (36)
- 4. Method according to anyone of claims 1 to 3 wherein the distance d between the brake pad (16) and the brake disc (14) during drive mode is 0.25 mm «= d «= 1.8 mm, particularly 0.35 mm «= d «= 1.3 mm, preferably 0.43 mm «= d «= 1.0 mm and further preferred 0.50 mm «= d «= 0.6 mm.
- 5. Method according to anyone of claims 1 to 4 wherein the distance d1 is 0.05 mm «= d1 «= 1.0 mm, particularly 0.10 mm «= d «= 0.6 mm, preferably 0.13 mm «= d1 «= 0.4 mm and further preferred 0.15 mm «= d1 «= 0.2 mm.
- 6. Method according to anyone of claims 1 to 5 wherein the normal actuating pressure p is bar «= P «= 50 bar, particularly bar «= P «= 45 bar, preferably 20 bar «= P «= 40 bar and most preferred 25 bar «= P «= 35 bar.
- 7. Brake system for decelerating a vehicle, comprising a brake disc (14) for being connected to a wheel shaft (22), a brake pad (16) for being pressed towards the brake disc (14), wherein the brake pad (16) is positioned at a distance d with respect to the brake disc (14) during drive mode, and an ESC system (24) comprising a controller (32) for applying a predefined prefill pressure to the brake pad (16) for reducing the distance between the brake pad (16) and the brake disc (14) by a distance d1 after each detection of a normal brake wish, and for applying a normal actuating pressure to the brake pad (16) for reducing the distance between the brake pad (16) and the brake disc (14) further, wherein the normal actuating pressure is lower than the prefill pressure.
- 8. Brake system according to claim 7 characterized in that the predefined prefill pressure is higher than the normal actuating pressure by a pressure difference Ap of 0.5 bar «= Ap «= 5.0 bar, particularly 0.8 bar «= Ap «= 3.0 bar and preferably 1.0 bar«=Lp«= 2.0 bar.
- 9. Brake system according to claim 7 or 8 characterized in that the distance d1 is 0.05 mm «= d1 «= 1.0 mm, particularly 0.10 mm «= d «= 0.6 mm, preferably 0.13 mm «= d «= 0.4 mm and further preferred 0.15 mm «= d1 «= 0.2 mm.
- 10. Vehicle comprising a brake system (10) according to anyone of claims 7 to 9 for decelerating the vehicle, wherein the brake system (10) is particularly adapted for carrying out the method according to anyone of claims 1 to 5.
- 11. Computer program product comprising program code means stored on a computer readable medium for carrying out the method according to anyone of claims 1 to 6, when the computer program product is executed by a computer, particularly a controller (32) of a brake system (10) according to anyone of claims 7 to 9.
- 12. Software comprising coded instructions for carrying out the method according to anyone of claims 1 to 6, when the software is executed by a computer, particularly a controller (32) of a brake system (10) according to anyone of claims 7 to 9.
- 13. Signal sequence comprising computer readable instructions for carrying out the method according to anyone of claims 1 to 6, when the signal sequence is processed by a computer, particularly a controller (32) of a brake system (10) according to anyone of claims 7 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1003662.2A GB2478348B (en) | 2010-03-05 | 2010-03-05 | Method for controlling a brake and brake system with reduced energy losses as well as computer program product, software and signal sequence for carrying |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1003662.2A GB2478348B (en) | 2010-03-05 | 2010-03-05 | Method for controlling a brake and brake system with reduced energy losses as well as computer program product, software and signal sequence for carrying |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB201003662D0 GB201003662D0 (en) | 2010-04-21 |
| GB2478348A true GB2478348A (en) | 2011-09-07 |
| GB2478348B GB2478348B (en) | 2016-09-14 |
Family
ID=42136512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1003662.2A Expired - Fee Related GB2478348B (en) | 2010-03-05 | 2010-03-05 | Method for controlling a brake and brake system with reduced energy losses as well as computer program product, software and signal sequence for carrying |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2478348B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103373335A (en) * | 2012-04-13 | 2013-10-30 | 株式会社万都 | Initial flow increasing module for reducing delay of brake response |
| CN113500985A (en) * | 2021-08-03 | 2021-10-15 | 安徽江淮汽车集团股份有限公司 | Brake gap pre-filling control method, brake gap pre-filling control equipment, storage medium and brake gap pre-filling control device |
| CN115123161A (en) * | 2022-06-24 | 2022-09-30 | 东风汽车有限公司东风日产乘用车公司 | Vehicle control method, vehicle, and storage medium |
| CN117162976A (en) * | 2023-09-08 | 2023-12-05 | 无锡车联天下信息技术有限公司 | Vehicle braking control method and device, electronic equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040201273A1 (en) * | 2003-04-10 | 2004-10-14 | Masahiko Kamiya | Vehicle brake device |
| US20080265663A1 (en) * | 2007-04-25 | 2008-10-30 | Gm Global Technology Operations, Inc. | Active Brake Pads Retraction System and Method |
| WO2009083216A2 (en) * | 2007-12-21 | 2009-07-09 | Ipgate Ag | Brake system with adaptively controllable brake lining clearance |
-
2010
- 2010-03-05 GB GB1003662.2A patent/GB2478348B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040201273A1 (en) * | 2003-04-10 | 2004-10-14 | Masahiko Kamiya | Vehicle brake device |
| US20080265663A1 (en) * | 2007-04-25 | 2008-10-30 | Gm Global Technology Operations, Inc. | Active Brake Pads Retraction System and Method |
| WO2009083216A2 (en) * | 2007-12-21 | 2009-07-09 | Ipgate Ag | Brake system with adaptively controllable brake lining clearance |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103373335A (en) * | 2012-04-13 | 2013-10-30 | 株式会社万都 | Initial flow increasing module for reducing delay of brake response |
| CN113500985A (en) * | 2021-08-03 | 2021-10-15 | 安徽江淮汽车集团股份有限公司 | Brake gap pre-filling control method, brake gap pre-filling control equipment, storage medium and brake gap pre-filling control device |
| CN115123161A (en) * | 2022-06-24 | 2022-09-30 | 东风汽车有限公司东风日产乘用车公司 | Vehicle control method, vehicle, and storage medium |
| CN115123161B (en) * | 2022-06-24 | 2024-04-19 | 东风汽车有限公司东风日产乘用车公司 | Vehicle control method, vehicle, and storage medium |
| CN117162976A (en) * | 2023-09-08 | 2023-12-05 | 无锡车联天下信息技术有限公司 | Vehicle braking control method and device, electronic equipment and storage medium |
| CN117162976B (en) * | 2023-09-08 | 2024-05-03 | 无锡车联天下信息技术有限公司 | Vehicle braking control method and device, electronic equipment and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2478348B (en) | 2016-09-14 |
| GB201003662D0 (en) | 2010-04-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20180305 |