GB2587377A - A modular braking system - Google Patents

A modular braking system Download PDF

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Publication number
GB2587377A
GB2587377A GB1913851.0A GB201913851A GB2587377A GB 2587377 A GB2587377 A GB 2587377A GB 201913851 A GB201913851 A GB 201913851A GB 2587377 A GB2587377 A GB 2587377A
Authority
GB
United Kingdom
Prior art keywords
braking
linear actuator
lac
braking system
pedal
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.)
Pending
Application number
GB1913851.0A
Other versions
GB201913851D0 (en
Inventor
Florin Lazar Ioan
Ramona Holban Diana
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.)
Continental Teves AG and Co OHG
Continental Automotive Romania SRL
Original Assignee
Continental Teves AG and Co OHG
Continental Automotive Romania SRL
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 Continental Teves AG and Co OHG, Continental Automotive Romania SRL filed Critical Continental Teves AG and Co OHG
Priority to GB1913851.0A priority Critical patent/GB2587377A/en
Publication of GB201913851D0 publication Critical patent/GB201913851D0/en
Publication of GB2587377A publication Critical patent/GB2587377A/en
Pending legal-status Critical Current

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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
    • 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
    • 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
    • B60T1/10—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels by utilising wheel movement for accumulating energy, e.g. driving air compressors
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/343—Systems characterised by their lay-out
    • 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
    • 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
    • B60T8/88—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 with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means
    • B60T8/885—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 with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means using electrical circuitry
    • 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
    • B60T8/88—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 with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means
    • B60T8/92—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 with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means automatically taking corrective action
    • 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
    • F16D61/00—Brakes with means for making the energy absorbed available for use
    • 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
    • B60T2270/40—Failsafe aspects of brake control systems
    • 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
    • B60T2270/40—Failsafe aspects of brake control systems
    • B60T2270/402—Back-up
    • 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
    • B60T2270/40—Failsafe aspects of brake control systems
    • B60T2270/403—Brake circuit failure
    • 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
    • B60T2270/40—Failsafe aspects of brake control systems
    • B60T2270/404—Brake-by-wire or X-by-wire failsafe
    • 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
    • B60T2270/40—Failsafe aspects of brake control systems
    • B60T2270/413—Plausibility monitoring, cross check, redundancy
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Regulating Braking Force (AREA)

Abstract

A modular electro-hydraulic (EHB) brake-by-wire (BBW) braking system comprising a reservoir 1, a pedal 5 with sensor 2-1 and pedal feel simulator 2-2; and at least two identical individually-powered braking modules 31, 32. Each module includes: an electronic control unit 41, 42; two wheel brakes 31-1, 31-2, 31-3, 31-4; a linear actuator 31-2, 31-3 with motor 31-3M, 32-3M and piston 31-3P, 31-3P, electro-mechanical valves 31-4, 32-4 for anti-lock braking (ABS); and sensors, to detect the position of the motor 31-3-S1, 32-3-S1 and piston 31-3-S2, 31-3-S2 and 31-3-S3, 32-3-S3 to detect the current pressure Pc in the circuit. The ECU is configured to receive input from the pedal sensor to determine the required output pressure Preq, receive inputs from the other sensors, control the linear actuator to provide Pc equal to Preq, and determine a failure of the braking module if the relationship between the current pressure and required pressure is wrong, e.g. Pc less than 90 percent of Preq. If failure is determined the ECU turns off the module and outputs a failure message to the driver. The system provides ABS redundancy (failsafe).

Description

Description
A MODULAR BRAKING SYSTEM
Field of the invention
This invention relates to a braking system for vehicles. In particular, this invention relates to a modular braking system that improves the safety of braking in fallback mode.
Background of the invention
The majority of existing vehicles are equipped with hydraulic braking systems provided with an anti-lock braking system ABS. Said hydraulic braking systems integrate generation and wheel-individual modulation of brake pressures in a single module. The energy to provide these pressures is supplied by the on-board power supply of the vehicle, wherein no vacuum is required.
With reference to Fig 1, the existing braking system of the vehicle contain the following component parts: a brake pedal, actuated by the driver when necessary and a corresponding pedal simulator enabling the control of actuation of the pedal, a reservoir for supplying braking fluid in the braking system, an electronic control unit ECU (not represented) for controlling all components of the braking system, a linear actuator LAC for generating pressure in the system, said linear actuator LAC comprising a motor and a piston sliding in its piston housing, a valve block comprising a plurality of electro-mechanical valves ensuring the proper pressure of the braking fluid, a tandem master cylinder TMC ensuring equalization of the braking pressure applied on all wheels of the vehicle, sensors for determining various parameters in the braking system and means of communication between all mentioned component parts.
The braking system is powered from a power supply of the vehicle.
The braking system functions in two mutually excluding operational modes: normal mode and hydraulic fallback mode.
In normal mode, the braking energy from the power supply of the braking system functions normally and, as such, it is able 5 to provide additional pressure necessary for the normal operation of the anti-lock braking system ABS.
When the power supply of the braking system does no longer function, the braking system works in hydraulic fallback mode. In this case, braking energy comes from pedal actuation, wherein the brake fluid pushed out of the tandem master cylinder TMC by a brake pedal stroke is passed through the braking system to the hydraulic wheel brakes and the wheel brake pressures correspond to the brake pedal actuation force. Anti-lock braking system. ABS is not active in hydraulic fallback mode due to lack of power supply.
Disadvantages of prior art
The safety of the braking system is not satisfactory as in hydraulic fallback mode the anti-lock braking system ABS is not active, and thus the brake function is less efficient and/or safe.
The braking system is complex, as it comprises a large number of electro-mechanical valves, placed in such a way to enable mechanical and/or hydraulically connections between them and between certain component parts and all wheels of the vehicle.
Certain functions are carried out by means of valves, such as in a diagnostic operational mode the pressure equalization connection between the primary TMC chamber and the reservoir is temporarily closed by means of a diagnosis valve, while two feed valves being provided for ensuring a hydraulic connection between the linear actuator and the inlet valves, and, additionally, a simulator valve being necessary for providing a hydraulic connection between the TMC and the pedal feel simulator.
This makes the system-usually as a unique assembly, bulky and heavy. This is a major disadvantage because the available space for mounting all the components of the braking system in the vehicle's motor compartment is reduced.
The braking systems allows a limited regenerative brake because it has a single braking module comprising a single motor 5 and power supply.
Problem solved by the invention The problem solved by the invention is to provide a safer and simplified braking system, improving the safety of braking in 10 fallback mode, in particular ensuring the functioning of the anti-lock braking system ABS in fallback mode.
Summary of the invention
In order to solve the problem, the inventors conceived a modular braking system comprising the following components: a brake fluid reservoir, a pedal, at least two braking modules, one braking module corresponding to each pair of either single or double wheels from one axle, and a vehicle bus.
The brake fluid reservoir supplies brake fluid in the modular 20 braking system.
The pedal is actuated by the driver when necessary in order to actuate the modular braking system.
The pedal comprises a pedal sensor, connected with the pedal, and configured to send to the braking modules specific data 25 corresponding to the position and actuation speed of said pedal. The pedal also comprises a pedal feel simulator, mechanically connected to the pedal, and configured to control the force of actuation of the pedal.
The braking modules are identical, individually powered, and 30 are connected to the brake fluid reservoir.
Each braking module comprises: two wheel brakes, one for each either single or double wheels of the vehicle; one linear actuator comprising: a motor and a piston sliding inside its piston housing, a first linear actuator sensor, a second linear actuator sensor, a third linear actuator sensor; a hydraulic braking circuit; a plurality of electro-mechanical valves, and an electronic control unit.
The linear actuator is configured for generating pressure 5 inside the hydraulic braking circuit for operating the two wheel brakes.
The first linear actuator sensor is connected to the linear actuator, is configured to detect the position corresponding to the rotation of the motor of the linear actuator and is further configured to send the result of detection to the electronic control unit.
The second linear actuator sensor is connected to the linear actuator, is configured to detect the position corresponding to the longitudinal movement of the piston inside its piston housing and is further configured to send the result of detection to the electronic control unit.
The third linear actuator sensor is connected to the hydraulic braking circuit, between the linear actuator and the plurality of electro-mechanical valves, is configured to detect the current pressure inside the hydraulic braking circuit and is further configured to send the result of detection to said electronic control unit.
The hydraulic braking circuit is configured to connect the brake fluid reservoir with the linear actuator LAC and with the 25 two wheel brakes.
The plurality of valves is mounted within the hydraulic braking circuit, between the linear actuator LAC and the two wheel brakes, are configured to direct the brake fluid inside said hydraulic braking circuit and to ensure the functioning of the anti-lock braking system ABS on the corresponding two wheels of the respective axle, certain valves being no longer necessary compared to the state of art, e.g. due to the lack of the tandem master cylinder.
The electronic control unit controls the braking module, and is configured: - to receive the results of real time detection from the first, second and third linear actuator sensors respectively; -to correlate said results of detection from the first, second and third linear actuator sensors, respectively, in order to determine the positions of the motor and its piston that correspond to a current pressure in the hydraulic braking circuit; -to connect electronically the pedal with the other components of the braking module; -to receive from the pedal sensor the data regarding the position and the speed of actuation of said pedal corresponding to a required pressure in the hydraulic braking circuit; -to determine the positions of the motor and its corresponding piston of the linear actuator that correspond to the required pressure in the hydraulic braking circuit; - to compare if the current pressure is equal with the required pressure in the hydraulic braking circuit; - in case the current pressure is not equal with the required pressure to send specific instructions to said linear actuator for rotating the motor and for longitudinally moving the piston in order to equal the current pressure with the required pressure; -to determine if a failure of the respective braking module occurs, namely a non-compliance with a set of pre-determined functioning conditions, out of which at least one pre-determined functioning condition refers to the relation between the current pressure and required pressure and, in the affirmative, to turn off the functioning of the braking module for which said failure was determined and to post a failure message on the vehicle panel board.
The vehicle bus is configured to allow data communication between the at least two electronic control units and the other components of the modular braking system.
When the failure of one of the braking modules occurs, due to the individual power supply of each of said at least two braking modules, the modular braking system is configured to ensure the braking function of the vehicle, by means of the braking modules which have not been turned off, said braking modules which have not been turned off continuing to be individually powered, in such a way to ensure the functioning of the anti-lock braking system ABS.
Advantages of the invention -Safer braking system because it ensures the functioning of the anti-lock braking system ABS in the fallback mode; - Simplified configuration of the braking system because of the reduced number of valves; - Better positioning of the components within the engine compartment because the pedal is mechanically separated from the braking system, allowing flexible positioning of the braking modules within motor engine compartment, without being directly connected with the pedal; - Adaptability to a wide range of vehicles from smaller vehicles to big and heavy vehicles because of the modular construction of the braking system; - Enhanced regenerative brake of the modular braking system.
Brief description of the drawings
Fig.1) represents the braking system from the state of art, containing the following references: 1 -brake fluid reservoir; 2 -pedal; 2-1 -pedal sensor; 2-2 -pedal feel simulator PFS; 2-3 -tandem master cylinder Al, A2 -axles of the vehicle; 30-1 -Al wheel brakes; 30-2 -A2 wheel brakes; 30-3 -linear actuator LAC; 30-3-S1 -first linear actuator LAC sensor; 30-3-52 -second linear actuator LAC sensor; 30-3-53 -third linear actuator LAC sensor; 30-3M -motor; 30-3P -piston; 30-4i -electro-mechanical valves.
Fig. 2 represents the modular braking system according to the invention that may comprise n modules, where n is a natural number greater than or equal to 2, one braking module on each axle of the vehicle. For the sake of simplification, Fig. 2 refers to the case of a vehicle with 2 axles, Al and A2, and said modular braking system comprises two braking modules 31 and 32, wherein the list of references is the following: 1 -brake fluid reservoir; 2 -pedal; 2-1 -pedal sensor; 2-2 -pedal feel simulator PFS; Al, A2 -axles of the vehicle; 31, 32 -braking modules; -wheel brakes of braking module 31; -wheel brakes of braking module 32; -linear actuators LAC; first linear actuators LAC sensors; second linear actuators LAC sensors; third linear actuators LAC sensors; 31-3M, 32-3M -motors; 31-1, 31-2 32-1, 32-2 31-3, 32-3 31-3-51, 32-3-51 - 31-3-52, 32-3-52 - 31-3-83, 32-3-83 - 31-32, 32-32 -pistons; 31-4i, 32-4i -electro-mechanical valves; -pressure feed valve; A, B -inlet valves; C, D -outlet valves; 41, 42 -electronic control units ECU.
Detailed description
For an easier understanding of the invention, in Fig. 2 it is represented a modular braking system according to the invention comprising anti-lock braking system ABS and two identical braking modules for a vehicle having four wheels placed on two axles Al and A2. It shall be understood that the modular braking system according to the invention may comprise two or more identical braking modules 31,32_3n for at least two axles Al, A2_An.
Also, for an easier understanding of the teaching of the invention, the detailed description below refers to one of the identical braking modules.
Said at least two braking modules 3n are identical, 20 individually powered, connected to said brake fluid reservoir 1, each of said at least two braking modules 3n acting on the two wheels of the same axle.
The term "wheel", as used in the invention, stands for one wheel or a group of two wheels fulfilling the function of one wheel. 25 Thus, each axle has a pair of either single or double wheels, depending on the vehicle type.
According to Fig. 2, said modular braking system comprises: - a brake fluid reservoir 1 for supplying the brake fluid; - a pedal 2 for actuating said modular braking system; -two braking modules 31 and 32; - a pedal sensor 2-1 connected to said pedal, and configured to send to the braking modules 31,32 by means of at least two electronic control units ECU 41, 42, specific data corresponding to the position and actuation speed of said pedal 2; - a pedal feel simulator 2F5 2-2 mechanically connected to said pedal 2, and configured to control the force of actuation of the pedal 2; - a vehicle bus configured to allow data communication between said at least two electronic control units ECU 41 and the other components of the modular braking system.
In the invention, the fallback mode is triggered by a failure 10 of one of the at least two braking modules 31, 32, whereas in normal mode, all the braking modules are powered and work. The conditions defining the failure refer to the non-compliance with a set of pre-determined functioning conditions for each vehicle. The at least two braking modules 31 and 32 are identical and 15 individually powered and are connected to the brake fluid reservoir 1. Each of the at least two braking modules 31 and 32 acts on the two wheels of the same axle Al and A2, respectively. Each of said at least two braking modules 31 and 32 comprises the following component parts: -two wheel brakes 31-1, 31-2 and 32-1, 32-2, respectively, one-wheel brake corresponding to each wheel of the vehicle; -a linear actuator LAC 31-3, 32-3 configured for generating pressure inside a hydraulic braking circuit, represented with broken line in Fig. 2, for operating said two pairs of wheel brakes 31-1, 31-2 and 32-1, 32-2. The linear actuator LAC 31-3, 32-3 comprises a motor 31-3M, 32-3M and a piston 31-3P, 32-3P sliding inside its piston housing; -the hydraulic braking circuit is configured to hydraulically connect the brake fluid reservoir 1 with the linear actuator LAC 31-3, 32-3 and with the corresponding wheel brakes 31-1, 31-2 and 32-1, 32-2, respectively; -a plurality of electro-mechanical valves 31-41, 32-41 mounted within the hydraulic braking circuit, between the linear actuator LAC 31-3, 32-3 and the corresponding wheel brakes 31-1, 31-2 and 32-1, 32-2, respectively. The plurality of electro-mechanical valves 31-4i, 32-4i are as follows: -a pressure feed valve Fl, F2 connected to the linear actuator LAC 31-3, 32-3, configured to be closed in normal mode, and it being configured for isolating the hydraulic braking circuit in fallback mode; -two inlet valves, namely inlet valve Al, A2 and inlet valve Bl, B2, one for each wheel, configured for ensuring the proper amount of braking fluid for each wheel; said inlet valves Al, B1 and A2, B2 are placed parallel, connected to the corresponding pressure feed valve F1, F2 and to corresponding wheel brakes 31-1, 32-1 and 31-2, 32-2, respectively; -two outlet valves, namely outlet valve 01, 02 and outlet valve D1, D2, one for each wheel, used for activating the anti-lock braking system ABS; said outlet valves Cl, D1 and C2, D2, respectively are placed between the inlet valves Al, B1 and A2, E2 and the corresponding wheels, said outlet valves are also connected with the reservoir 1, and said outlet valves being configured for releasing the wheel pressure in case of activating the anti-lock braking system ABS; -a first linear actuator LAC sensor 31-3-S1, 32-3-S1, connected to the linear actuator LAC 31-3, 32-3, configured to detect the position corresponding to the rotation of the motor 31-3M, 32-3M of the corresponding linear actuator LAC 31-3, 32-3 and further configured to send the result of detection to said electronic control unit ECU 41, 42; - a second linear actuator LAC sensor 31-3-S2, 32-3-32, connected to the linear actuator LAC 31-3, 32-3, configured to detect the position corresponding to the longitudinal movement of the corresponding piston 31-32, 32-3P inside its piston housing and further configured to send the result of detection to said electronic control unit ECU 41, 42; - a third linear actuator LAC sensor 31-3-33, 32-3-33, connected to the hydraulic braking circuit, between the linear actuator LAC 31-3, 32-3 and the plurality of electro-mechanical valves 31-4i, 32-4i, configured to detect the current pressure Pc inside the hydraulic braking circuit and further configured to send the result of detection to said electronic control unit ECU 41, 42; - said electronic control unit ECU 41, 42 controlling the respective braking module 31, 32, and it being configured: -to receive the results of real time detection from the first, second and third linear actuator LAC sensors 31-3-S1, 31-3-52 and 31-3-53 respectively, 32-3-S1, 32-3-52 and 32-3-53 respectively; -to correlate said results of detection from the first, second and third linear actuator LAC sensors 31-3-S1, 31-3-S2 and 31-3-53 respectively, 32-3-S1, 32-3-62 and 32-3-63 respectively, in order to determine the positions of said motor 31-3M, 32-3M and its piston 31-3P, 32-3P, that correspond to a current pressure Pc in the hydraulic braking circuit; -to connect electronically the pedal 2 with the other components of the braking module 31, 32, as marked in Fig. 2 with light thin line; - to receive from the pedal sensor 2-1 the data regarding the position and the speed of actuation of said pedal 2 corresponding to a required pressure Preq in the hydraulic braking circuit; - to determine the positions of said motor 31-3M, 32-3M and its corresponding piston 31-3P, 32-3P of the linear actuator LAC 31-3, 32-3 that correspond to the required pressure Frog in the hydraulic braking circuit; to compare if the current pressure Pc is equal with the required pressure Preq in the hydraulic braking circuit; in case the current pressure Pc is not equal with the required pressure Preq, to send specific instructions to said linear actuator LAC 31-3, 32-3 for rotating the motor 31-3M, 32-3M and for longitudinally moving the piston 31-3P, 32-3P in order to equal the current pressure Pc with the required pressure Preq; to determine if a failure of the respective braking module 31, 32 occurs, namely a non-compliance with a set of pre-determined functioning conditions, out of which at least one pre-determined functioning condition referring to the relation be.Tween the current pressure Pc and required pressure Preq and, in the affirmative, to turn off the functioning of the braking module 3n for which said failure was determined and to post a failure message on the vehicle panel board.
When said failure of one of the braking modules 31 or 32 occurs, due to the individual power of each of said at least two braking modules 31, 32, the modular braking system is configured to ensure the braking function of the vehicle, by means of the remaining at least one braking module 31 or 32 which has not been turned off, said remaining at least one braking module 31 or 32 continuing to be individually powered in such a way to ensure the functioning of the anti-lock braking system ABS by means of the corresponding outlet valves Cl and D1 or 02 and D2.
In a preferred embodiment, the at least one pre-determined functioning condition refers to the relation between the current pressure Sc and the required pressure Freq. Said relation is that the current pressure Pc, deteLiined after the actuation of the pedal 2 must be equal to or greater than a minimum required pressure Pmin req calculated as a percentage xl of the required pressure Dreg, where).C. < 100.
In another preferred embodiment, the minimumrequiredpressure is at least 90-i, inclusively of the required pressure Dreg. In another preferred embodiment, in order to warn the driver about an imminent failure, a set of pre-determined functioning conditions include a warning pressure Pw higher than or equal to 20 the minimum required pressure Pmin req and lower than the required pressure Preq. The electronic control unit ECU 41, 42 of the respective braking module 31, 32 subject to imminent failure is configured to post a warning message on the vehicle panel board when the warning pressure Pw is reached.
In another preferred embodiment, the modular braking system contains a single electronic control unit ECU 4, individually powered, for said at least two braking modules 31, 32.
In another preferred embodiment, the modular braking system is adapted for a vehicle with four wheels placed on two axles, namely two front wheels placed on a front axle, and two rear wheels placed on a rear axle, said modular braking system comprising two identical braking modules, namely a first braking module 31 acting on the front wheels placed on the front axle and a second braking module 32 acting on the rear wheels placed on the rear axle. This embodiment corresponds to the situation presented in the Fig. 2, namely the modular braking system comprising two identical braking modules.
In another preferred embodiment, the modular braking system 5 is configured for a vehicle having a plurality of wheels placed on a plurality of at least three axles Al, A2, A3.... An, each axle having a pair of either single or double wheels, depending on of the vehicle type. The modular braking system comprises a number of braking modules 31, 32, 33...3n, equal with the number of axles 10 of the vehicle.
While the description of the invention is detailed in connection to the preferred embodiments, those skilled in the art will appreciate that changes situation without departing 15 teaching of the invention.
may be made to adapt a particular from the essential scope to the

Claims (7)

  1. Patent claims 1.A modular braking system comprising anti-lock braking system (ABS) for a vehicle having at least four wheels placed on at least two axles (Al, A2), characterized in that said modular braking system comprises: - a brake fluid reservoir (1) for supplying the brake fluid; - a pedal (2) for actuating said modular braking system; - apedal sensor (2-1) connected to said pedal, and configured to send to at least two braking modules (31, 32) by means of at least two electronic control units (ECU) (41, 42) specific data corresponding to the position and actuation speed of said pedal (2); - a pedal feel simulator (PFS) (2-2) mechanically connected to said pedal (2), and configured to control the force of actuation of the pedal (2); - said at least two braking modules (31, 32), identical, individually powered, connected to said brake fluid reservoir (1), each of said at least two braking modules (31, 32) acting on the two wheels of the same axle, and each of said at least two braking modules (31, 32) comprising: -two wheel brakes (31-1, 31-2), (32-1, 32-2), one-wheel brake corresponding to each wheel of the vehicle; -a linear actuator (LAC) (31-3, 32-3), configured for generating pressure inside a hydraulic braking circuit for operating said two wheel brakes (31-1, 31-2), (32-1, 32-2), said linear actuator (LAC) (31-3, 32-3) comprising a motor (31-3M, 32-3M) and a piston (31-3P, 32-3P) sliding inside its piston housing; -said hydraulic braking circuit being configured to connect said brake fluid reservoir (1) with said linear actuator (LAC) (31-3, 32-3) and with said two wheel brakes (31-1, 31-2), (32-1, 32-2); - a plurality of electro-mechanical valves (31-41, 32-41) mounted within the hydraulic braking circuit, between said linear actuator (LAC) (31-3, 32-3) and said two wheel brakes (31-1, 31-2), (32-1, 32-2), said plurality of electro-mechanical valves (31-4i, 32-4i) being configured to direct the brake fluid inside said hydraulic braking circuit and to ensure the functioning of the anti-lock braking system ABS on the corresponding two wheels of the respective axle (Al, A2); a first linear actuator (LAC) sensor (31-3-51, 32-351), connected to the linear actuator linear actuator (LAC) (31-3, 32-3), configured to detect the position corresponding to the rotation of the motor (31-3M, 32-3M) of the linear actuator (LAC) (31-3, 32-3) and further configured to send the result of detection to said electronic control unit (ECU) (41, 42); - a second linear actuator (LAC) sensor (31-3-52, 32-3-S2), connected to the linear actuator (LAC) (3n-3), configured to detect the position corresponding to the longitudinal movement of the piston (31-3P, 32-3P) inside its piston housing and further configured to send the result of detection to said electronic control unit (ECU) (41, 42); a third linear actuator (LAC) sensor (31-3-53, 32-3-53), connected to the hydraulic braking circuit, between the linear actuator (LAC) (31-3, 32-3) and the plurality of electro-mechanical valves (31-4i, 32-4i), configured to detect the current pressure (Pc) inside the hydraulic braking circuit and further configured to send the result of detection to said electronic control unit (ECU) (41, 42); - said electronic control unit (ECU) (41, 42) controlling the respective braking module (31, 32), and said electronic control unit (ECU) (41, 42) being configured: - to receive the results of real time detection from the first, second and third linear actuator (LAC) sensors (31-3-51, 31-3-S2 and 31-3-53 respectively), (32-3-S1, 32-3-S2 and 32-3-S3 respectively); - to correlate said results of detection from the first, second and third linear actuator (LAC) sensors (31-3-S1, 31-3-S2 and 31-3-53 respectively), (32-3-S1, 32-3-S2 and 32-3-S3 respectively), in order to determine the positions of said motor (31-3M, 32-3M) and its piston (31-3P, 32-3P), that correspond to a current pressure (Pc) in the hydraulic braking circuit; -to connect electronically the pedal (2) with the other components of the braking module (31, 32); - to receive from the pedal sensor (2-1) the data regarding the position and the speed of actuation of said pedal (2) corresponding to a required pressure (Preq) in the hydraulic braking circuit; -to determine the positions of said motor (31-3M, 32-3M) and its corresponding piston (31-3P, 32-3P) of the linear actuator (LAC) (31-3, 32-3) that correspond to the required pressure (Preq) in the hydraulic braking circuit; -to compare if the current pressure (Pc) is equal with the required pressure (Preq) in the hydraulic braking circuit; -in case the current pressure (Pc) is not equal with the required pressure (Preq), to send specific instructions to said linear actuator (LAC) (31-3, 32-3) for rotating the motor (31-3M, 32-3M) and for longitudinally moving the piston (31-3P, 32-3P) in order to equal the current pressure (Pc) with the required pressure (Preq); -to determine if a failure of the respective braking module (31, 32) occurs, namely a non-compliance with a set cf pre-determined functioning conditions, out of which at least one pre-determined functioning condition referring to the relation between the current pressure (Pc) and required pressure (Preq) and, in the affirmative, to turn off the functioning of the braking module (31, 32) for which said failure was determined and to post a failure message on the vehicle panel board; -a vehicle bus configured to allow data communication between said at least two electronic control units (ECU) (41, 42) and the other components of the modular braking system, wherein, when said failure of one of the braking modules (31, 32) occurs, due to the individual power of each of said at least two braking modules (31, 32), said modular braking system being configured to ensure the braking function of the vehicle, by means of the braking modules (31, 32) which have not been turned off, said braking modules (31, 32) which have not been turned off continuing to be individually powered in such a way to ensure the functioning of the anti-lock braking system (ABS).
  2. 2.A modular braking system according to claim 1, wherein the at least one pre-determined functioning condition referring to the relation between the current pressure (Pc) and required pressure (Preq) is that the current pressure (Pc) determined after the pedal (2) is actuated, is equal to or greater than a minimum required pressure (Pmin req), calculated as a percentage x% of the required pressure (Preq), where xi < 100-(is.
  3. 3. A modular braking system according claim 2, wherein the minimum required pressure (Pmin req) is at least 90% inclusively of the required pressure (Preq) .
  4. 4.A modular braking system according to claims 2 and 3, wherein in order to warn the driver about an imminent failure, a set of pre-determined functioning conditions include a warning pressure (2w) higher than or equal to the minimum required pressure (2min req) and lower than the required pressure (Preq), the electronic control unit (ECU) (41, 42) of the respective braking module (3n) subject to imminenT failure being configured to post a warning message on the vehicle panel board when the warning pressure (Pw) is reached.
  5. 5.A modular braking system according to any preceding claim, wherein said modular braking system contains a single electronic control unit (ECU) (4), individually powered, for said at least two braking modules (31, 32).
  6. 6.A modular braking system according to any preceding claims, wherein the vehicle has four wheels placed on two axles, namely two front wheels placed on a front axle, and two rear wheels placed on a rear axle, said modular braking system comprising two identical braking modules (31) and (32), namely a first braking module (31) acting on the front wheels placed on the front axle and a second braking module (32) acting on the rear wheels placed on the rear axle.
  7. 7.A modular braking system according to claims from 1 to 5, wherein said vehicle has a plurality of wheels placed on a plurality of at least three axles (Al, A2, A3...An), each axle having a pair of either single or double wheels, depending on of the vehicle type, and said modular braking system comprising a plurality of braking modules (31, 32, 33 _. 3n), each braking module (31, 32, 33...3n) acting on each of the plurality of axles (Al, A2, A3 An).
GB1913851.0A 2019-09-26 2019-09-26 A modular braking system Pending GB2587377A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013217954A1 (en) * 2013-09-09 2015-03-12 Continental Teves Ag & Co. Ohg Brake system for a motor vehicle and operating method
EP2998173A1 (en) * 2013-05-13 2016-03-23 Toyota Jidosha Kabushiki Kaisha Brake device
US20180290640A1 (en) * 2017-04-06 2018-10-11 Ford Global Technologies, Llc Methods and apparatus to control vehicle braking systems
US20180334149A1 (en) * 2017-05-17 2018-11-22 Mando Corporation Electronic brake system
US20190031165A1 (en) * 2016-03-04 2019-01-31 Continental Teves Ag & Co. Ohg Brake system having two pressure-providing devices and method for operating a brake system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2998173A1 (en) * 2013-05-13 2016-03-23 Toyota Jidosha Kabushiki Kaisha Brake device
DE102013217954A1 (en) * 2013-09-09 2015-03-12 Continental Teves Ag & Co. Ohg Brake system for a motor vehicle and operating method
US20190031165A1 (en) * 2016-03-04 2019-01-31 Continental Teves Ag & Co. Ohg Brake system having two pressure-providing devices and method for operating a brake system
US20180290640A1 (en) * 2017-04-06 2018-10-11 Ford Global Technologies, Llc Methods and apparatus to control vehicle braking systems
US20180334149A1 (en) * 2017-05-17 2018-11-22 Mando Corporation Electronic brake system

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