CN112384416B - Method for controlling a hydraulic motor vehicle brake system and motor vehicle brake system - Google Patents
Method for controlling a hydraulic motor vehicle brake system and motor vehicle brake system Download PDFInfo
- Publication number
- CN112384416B CN112384416B CN201980044431.9A CN201980044431A CN112384416B CN 112384416 B CN112384416 B CN 112384416B CN 201980044431 A CN201980044431 A CN 201980044431A CN 112384416 B CN112384416 B CN 112384416B
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- Prior art keywords
- brake
- motor vehicle
- pressure
- drum
- vehicle
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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
- B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
- B60T1/02—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels
- B60T1/06—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels
- B60T1/067—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels employing drum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/02—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 mechanical assistance or drive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—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
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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
Abstract
The invention relates to a method for controlling a hydraulic motor vehicle brake system (100) having a drum brake (120) which acts as a service brake during a driving operation and having an electromechanical brake booster (140). An electromechanical brake booster (140) forms a pre-pressure (p) during vehicle start-up as a function of a vehicle-specific p-V characteristic curve (K) for a drum brake (120) 0 ) The pre-pressure is applied to the drum brake (120) for the purpose of compensating for idle travel and remains unchanged during driving operation. The invention further relates to a corresponding motor vehicle brake system (100).
Description
Technical Field
The invention relates to a method for controlling a hydraulic motor vehicle brake system having a drum brake which, during driving operation, acts as a service brake and having an electromechanical brake booster. The invention further relates to a corresponding motor vehicle brake system for a motor vehicle. Drum brakes have various advantages, such as higher efficiency, lower wear and less brake dust emissions, especially compared to disc brakes. However, drum brakes not only require higher applied pressures, but also have a longer idle stroke due to the larger play, in which no braking torque is formed. This results in a longer brake pedal stroke being experienced until the pressure point at which the brake pads bear against the brake drum is reached. Attempts have been made to eliminate this disadvantage by mechanical measures, for example, adjustment of the spring stack or the adjusting mechanism.
Background
Document DE 10 2008 054 859 A1 describes a method for controlling a hydraulic vehicle brake system having a disk brake or drum brake, wherein an electromechanical brake booster is provided, which forms a boost force, for example by means of an electric motor, which, together with a muscle force applied via a brake pedal, actuates a master brake cylinder. The above-described problem of idle travel in drum brakes is not addressed.
Disclosure of Invention
The object of the present invention is to provide a method for controlling a motor vehicle brake system having a drum brake, which does not have or at least only reduces at least one disadvantage caused by the prior art.
The object is achieved by a method for controlling a hydraulic motor vehicle brake system. The invention also relates to a corresponding motor vehicle brake system. Modifications and designs of the invention are also presented from the following description of the invention and from the accompanying drawings similarly for both inventive solutions.
The method according to the invention is characterized in that the electromechanical brake booster forms a pre-pressure on the drum brake for the compensation of the idle stroke when the vehicle is started, i.e. when the driving preparation of the motor vehicle is completed, said pre-pressure being applied to the drum brake and being held or unchanged during the driving operation (during which the drum brake acts as a service brake).
The pre-pressure enables compensation of the idle stroke on the drum brake. If the driver or driver actuates the brake pedal (or the like), the resulting pressure is superimposed on the held pre-pressure. The idle stroke of the drum brake has been overcome by the pre-compression or the pre-stress achieved thereby and a shorter pedal stroke with a relatively hard pressure point is created (drum brakes are generally characterized by softer pressure points). Thereby creating a subjectively better pedal feel.
The electromechanical brake booster (eBKV) used is formed in that it is capable of generating a brake pressure on a drum brake without the driver having to actuate a brake pedal. For this purpose, electromechanical brake boosters are provided with an EBR (external brake request) interface, for example.
Furthermore, the motor vehicle brake system can have a control valve for driving dynamics control (ESC), with which the wheel brake pressure can be reduced and/or generated in a targeted manner. It is preferably provided that the pre-pressure exerted on the drum brake is maintained, i.e. to some extent "locked", by the control valve.
A further possibility is provided that the motor vehicle brake system has at least one pressure accumulator sleeve with which the pre-pressure exerted on the drum brake is maintained. Such an accumulator sleeve is an additional component which is arranged in a hydraulic branch leading into the drum brake. The accumulator sleeve is preferably constructed with an actuator in order to be able to perform an adaptation in accordance with a desired pre-pressure, which is read, for example, via the vehicle main line by a control device of the electromechanical brake booster or by a control device which is dynamically regulated by the driving (see below).
The p-V characteristic curve shows the hydraulic pressure p (brake pressure) applied to the drum brake as a function of the hydraulic volume V (volume capacity or displaced liquid volume) required for this purpose. In view of manufacturing tolerances, the p-V characteristic is vehicle-specific or vehicle-personalized. The p-V characteristic for the drum brake can be determined during the production of the vehicle, for example in line end detection, and then stored or stored, for example, in a control device of the electromechanical brake booster or in a control device of the driving dynamics control, and thus made available. The p-V characteristic is preferably determined and stored in a number-axis manner. From the p-V characteristic curve, the necessary pre-compression force (p 0 ) This will be described in more detail below. In principle, it is conceivable to determine and store an own p-V characteristic for each drum brake. The p-V characteristic can be recalibrated or retrained later (after the vehicle has been manufactured), for example in a professional.
The motor vehicle stop device according to the invention for a motor vehicle has:
a plurality of, i.e. at least two drum brakes, which act as service brakes during driving operation;
-an electromechanical brake booster; and
a control device or the like, wherein this is in particular a control device of an electromechanical brake booster or a control device of a driving dynamics control, which controls or adjusts a motor vehicle brake system in such a way that the electromechanical brake booster, when the vehicle is started, forms a pre-pressure according to a vehicle-specific p-V characteristic curve for the drum brake, which is applied to the drum brake for the purpose of compensating for the idle stroke and is held or held unchanged.
Preferably, the drum brake is arranged (only) on the rear axle of the motor vehicle, whereas the front axle of the motor vehicle is preferably equipped with a disc brake.
Drawings
The invention is illustrated by way of example and not by way of limitation in the following more detailed description with the aid of the accompanying drawings. The technical features shown in the drawings and/or described below may also be independent of the specific feature combinations, general technical features of the invention and the invention may be modified accordingly.
Fig. 1 shows the characteristic course of the p-V characteristic curve for a drum brake.
Fig. 2 shows a schematic illustration of a motor vehicle brake system according to the invention.
Detailed Description
As shown in fig. 1, the drum brake has a relatively large free travel S, in which no braking torque is produced despite actuation of a brake pedal or the like. The idle stroke S is characterized by a substantially horizontal course of the pressure-volume characteristic curve (K). If the free travel S is overcome while continuing the brake pedal actuation, the brake pressure p increases and a brake torque is formed.
The invention provides that a pre-pressure p is applied to a drum brake of a motor vehicle brake system for compensating for idle travel 0 And thereby to some extent pre-operate the drum brake. The necessary precompression or application pressure p 0 According to the useThe vehicle-specific p-V characteristic curve (K) for a drum brake is determined or derived therefrom and is dimensioned such that the brake linings are not yet rubbed against the brake drum (the result of the rubbed brake linings being able to cause heating and thus self-reinforcing, so-called self-braking). Precompression p 0 Is formed at the end of the horizontal section of the vehicle-specific p-V characteristic curve and can be determined graphically and/or mathematically. For the pressure value p 0 The volume value V is adapted (pre-pressure or applied pressure) 0 (applied volume).
Fig. 2 schematically shows a motor vehicle brake system 100 with two hydraulically actuated disk brakes 110 on a front axle VA and two hydraulically actuated drum brakes 120 on a rear axle HA of the motor vehicle. The drum brake 120 has the characteristics shown in fig. 1. The motor vehicle brake system 100 further has a brake pedal 130, an electromechanical brake booster 140 coupled to the brake pedal 130, and an ESC module 150 for driving dynamics control with a control valve 155 or ESC valve.
When the vehicle is started, i.e. when the operation of the motor vehicle is ready to be completed, a pre-pressure p determined by a stored vehicle-specific p-V characteristic curve for the drum brake 120 is applied to the drum brake 120 0 In that the electromechanical brake booster 140 applies a corresponding brake fluid volume (applied volume) V 0 Pumped into a hydraulic branch leading to the drum brake 120 (without having to operate the brake pedal 130). The control valve 155 is opened for this purpose and then closed, so that the precompression p is achieved 0 Remain unchanged during the following driving operation. During the start-up of the motor vehicle, the electromechanical brake booster 140 approaches the point p0/V0 of the stored p-V characteristic curve (K) and locks the pressure p on the rear axle HA via the ESC valve 0 。
Fig. 2 shows the state in which: when the brake pedal 130 is not actuated, the pressure p=0 at the disk brake 110 of the front axle VA and the pressure p=p at the drum brake of the rear axle HV 0 . By this main hydraulic measure (no additional components) the force on the drum brake 120 has been overcomeThe idle stroke S, i.e. the drum brake 120, can be said to be pre-actuated and the brake lining can be said to be in a position against the idle stroke or in a form against the idle stroke. If the driver steps on the brake pedal 130 during a subsequent driving operation, the control valve 155 opens, as soon as the pressure travelled by the brake pedal 130 exceeds the pressure locked on the rear axle HA or the pre-pressure p 0 The pressure developed by the driver is then superimposed on the locked pressure or pre-pressure p 0 And (3) upper part. A shorter pedal travel with a relatively hard pressure point as in a disk brake is formed. So-called pedal slackening does not occur. Readjusting to the pre-pressure p on the drum brake 120 of the rear axle HA when the brake pedal 130 is released 0 And the brake shoes are correspondingly reset, so that the brake pads are again in their idle-stroke-overcoming position without friction on the brake drum.
List of reference numerals
100. Automobile brake equipment (brake system)
110. Disc brake
120. Drum brake
130. Brake pedal
140. Electromechanical brake booster
150. Driving dynamic adjusting module
155. Control valve
HA rear axle
VA front axle
K characteristic curve
S idle stroke
p brake pressure
p 0 Precompression (applied pressure)
V volume
V 0 The volume is applied.
Claims (9)
1. A method for controlling a hydraulic motor vehicle brake system (100),the motor vehicle brake system comprises a drum brake (120) and an electromechanical brake booster (140), which acts as a service brake during driving operation, wherein the electromechanical brake booster (140) forms a pre-pressure (p) when the vehicle is started according to a vehicle-specific p-V characteristic curve (K) for the drum brake (120) 0 ) Said pre-pressure for achieving a compensation of the idle stroke is applied on the drum brake (120) and is of such a size that the brake lining is not yet rubbed on the brake drum, and wherein said pre-pressure (p 0 ) Remains unchanged during the driving operation.
2. Method according to claim 1, characterized in that a control valve (155) of a driving dynamics control module (150) is also included in the motor vehicle brake system (100), wherein the pre-pressure (p 0 ) Is held by the control valve (155).
3. Method according to claim 1, characterized in that the motor vehicle brake system (100) has at least one accumulator sleeve with which the pre-pressure (p) exerted on the drum brake (120) is maintained 0 )。
4. Method according to any of the preceding claims, characterized in that the vehicle-specific p-V characteristic (K) is stored in a control device of an electromechanical brake booster (140) or in a control device of a driving dynamics control module (150).
5. Method according to claim 1, characterized in that the p-V characteristic curve (K) determined at the time of vehicle manufacture is used.
6. Method according to claim 1, characterized in that a p-V characteristic (K) trained after the manufacture of the vehicle is used.
7. A motor vehicle brake system (100) for a motor vehicle, comprising:
-a plurality of drum brakes (120) acting as service brakes during driving operation;
-an electromechanical brake booster (140); and
-a control device controlling a motor vehicle brake device (100) in a method of: an electromechanical brake booster (140) forms a pre-pressure (p) during vehicle start-up as a function of a vehicle-specific p-V characteristic curve (K) for a drum brake (120) 0 ) Said pre-pressure for achieving a compensation of the idle stroke is applied on the drum brake (120) and is of such a size that the brake lining is not yet rubbed on the brake drum, and wherein said pre-pressure (p 0 ) Remains unchanged during the driving operation.
8. Motor vehicle brake system (100) according to claim 7, characterized in that the control device is a control device of an electromechanical brake booster (140) or a control device of a driving dynamics control module (150).
9. Motor vehicle brake apparatus (100) according to claim 7 or 8, characterized in that the drum brake (120) is arranged on the rear axle of the motor vehicle.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018211052.2A DE102018211052B4 (en) | 2018-07-04 | 2018-07-04 | Method for controlling a hydraulic motor vehicle brake system with drum brakes and free travel compensation, as well as a corresponding motor vehicle brake system |
| DE102018211052.2 | 2018-07-04 | ||
| PCT/EP2019/058639 WO2020007513A1 (en) | 2018-07-04 | 2019-04-05 | Method for controlling a hydraulic motor vehicle brake system with drum brakes and idle travel compensation, and corresponding motor vehicle brake system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112384416A CN112384416A (en) | 2021-02-19 |
| CN112384416B true CN112384416B (en) | 2023-06-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980044431.9A Active CN112384416B (en) | 2018-07-04 | 2019-04-05 | Method for controlling a hydraulic motor vehicle brake system and motor vehicle brake system |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN112384416B (en) |
| DE (1) | DE102018211052B4 (en) |
| WO (1) | WO2020007513A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022127064A1 (en) * | 2022-10-17 | 2024-04-18 | Zf Cv Systems Global Gmbh | Method for adjusting an application pressure of a vehicle brake and vehicle brake in question |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB689506A (en) * | 1950-08-16 | 1953-04-01 | William Bradley | Improvements in tension controlling brake means for apparatus for paying out flexible material |
| WO1998013244A1 (en) * | 1996-09-26 | 1998-04-02 | Toyota Jidosha Kabushiki Kaisha | Braking device |
| DE102008054859A1 (en) | 2008-12-18 | 2010-07-01 | Robert Bosch Gmbh | Method for controlling a brake actuation of a hydraulic vehicle brake system and electromechanical brake booster |
| DE102008054856A1 (en) * | 2008-12-18 | 2010-07-01 | Robert Bosch Gmbh | Method for controlling a hydraulic vehicle brake system |
| DE102010040726A1 (en) * | 2010-09-14 | 2012-03-15 | Robert Bosch Gmbh | Method for controlling a brake system of a motor vehicle and brake system for a motor vehicle |
| CN102205838A (en) * | 2010-11-04 | 2011-10-05 | 上海华普汽车有限公司 | Electric booster brake device for vehicle |
| CN104973038A (en) * | 2014-04-10 | 2015-10-14 | 上海通用汽车有限公司 | Vehicle electric control mechanical power assisting system, control method and vehicle |
| DE102015206918A1 (en) * | 2014-06-13 | 2015-12-17 | Ford Global Technologies, Llc | Method for operating an electromechanical vehicle brake system |
| DE102015200106B3 (en) * | 2015-01-08 | 2016-05-12 | Ford Global Technologies, Llc | Control method for a hydraulic brake system of a motor vehicle and hydraulic brake system |
| DE102016214490A1 (en) * | 2016-08-04 | 2018-02-08 | Volkswagen Aktiengesellschaft | Electromechanical brake booster |
| CN107225978B (en) * | 2017-05-03 | 2020-08-18 | 北京新能源汽车股份有限公司 | Electric vehicle braking method and device and electric vehicle |
-
2018
- 2018-07-04 DE DE102018211052.2A patent/DE102018211052B4/en active Active
-
2019
- 2019-04-05 WO PCT/EP2019/058639 patent/WO2020007513A1/en active Application Filing
- 2019-04-05 CN CN201980044431.9A patent/CN112384416B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112384416A (en) | 2021-02-19 |
| DE102018211052B4 (en) | 2021-05-12 |
| WO2020007513A1 (en) | 2020-01-09 |
| DE102018211052A1 (en) | 2020-01-09 |
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