WO2009103645A1 - Electronically controlled brake system for trailer tractors - Google Patents

Electronically controlled brake system for trailer tractors Download PDF

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Publication number
WO2009103645A1
WO2009103645A1 PCT/EP2009/051586 EP2009051586W WO2009103645A1 WO 2009103645 A1 WO2009103645 A1 WO 2009103645A1 EP 2009051586 W EP2009051586 W EP 2009051586W WO 2009103645 A1 WO2009103645 A1 WO 2009103645A1
Authority
WO
WIPO (PCT)
Prior art keywords
tractor
braking
trailer
abs
brake
Prior art date
Application number
PCT/EP2009/051586
Other languages
French (fr)
Inventor
Salvatore Frediani
Enrico Sedoni
Francesco Canuto
Original Assignee
Cnh Italia Spa
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 Cnh Italia Spa filed Critical Cnh Italia Spa
Priority to JP2010547150A priority Critical patent/JP2011514279A/en
Priority to RU2010138820/11A priority patent/RU2484991C2/en
Priority to US12/918,712 priority patent/US8967734B2/en
Priority to BRPI0907491-0A priority patent/BRPI0907491B1/en
Publication of WO2009103645A1 publication Critical patent/WO2009103645A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/16—Master control, e.g. master cylinders
    • B60T11/20—Tandem, side-by-side, or other multiple master cylinder units
    • B60T11/21—Tandem, side-by-side, or other multiple master cylinder units with two pedals operating on respective circuits, pressures therein being equalised when both pedals are operated together, e.g. for steering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/1701—Braking or traction control means specially adapted for particular types of vehicles
    • B60T8/1708—Braking or traction control means specially adapted for particular types of vehicles for lorries or tractor-trailer combinations

Definitions

  • the present invention relates to an electronically controlled brake system for trailer tractors.
  • a major problem of trailer tractors with a steer- by-braking function is preventing the trailer from braking, and therefore swerving of the tractor/trailer as a whole, when the (SBF) function is activated (i.e. by the driver to steer the tractor to the right or left) .
  • the present invention relates to an electronically controlled brake system designed to solve the above problem.
  • Number 10 in the attached drawing indicates as a whole an electronically controlled brake system, in particular for tractors, in accordance with the present invention .
  • System 10 comprises a compressor 11 for supplying compressed air to an air-processing - substantially air- dehumidifying - unit 12.
  • the processed air is stored in two parallel tanks 13a, 13b, both connected pneumatically to a pedal arrangement 14 which provides for both normal braking and steer-by-braking (SBF) of the tractor.
  • SBF steer-by-braking
  • the brake system when the driver presses the left (or right) pedal only, the brake system only brakes the rear left (or right) wheel, thus reducing the turn radius of the tractor, especially during headland manoeuvres.
  • a circuit 15 is connected to tank 13a to feed high- pressure (e.g. 8-bar) air to a brake valve 16 of a trailer (not shown) and to a high-pressure coupling 17 forming part of an assembly BTG for pneumatic connection to the trailer brake system (not shown) .
  • high-pressure e.g. 8-bar
  • a first adjustable low-pressure air circuit Cl and a second adjustable low-pressure air circuit C2 originate from pedal arrangement 14.
  • First circuit Cl comprises two branches Rl, R2, of which a first branch Rl connects pedal arrangement 14 pneumatically to the trailer brake valve 16, and a second branch R2 connects pedal arrangement 14 pneumatically to two front ABS modulators 18, 19.
  • ABS modulator 18 regulates compressed-air supply to a corresponding pneumatic/hydraulic converter 20, which converts the incoming energy, in the form of compressed air, to hydraulic energy to power a corresponding front right brake 21 of a front right wheel (not shown) fitted to an axle AXLl with a conventional differential DFl.
  • ABS modulator 19 regulates compressed-air supply to a corresponding pneumatic/hydraulic converter 22, which converts the incoming energy, in the form of compressed air, to hydraulic energy to power a corresponding front left brake 23 of a front left wheel (not shown) also fitted to axle AXLl.
  • a speed sensor SSl and speed sensor SS2 are provided for determining the speed of the front right wheel and front left wheel respectively.
  • ABS modulators 18, 19 and front-wheel speed sensors SSl, SS2 are connected electrically to an electronic central control unit CNT for the reasons explained below.
  • Second circuit C2 comprises two branches RMl and RM2.
  • a first branch RMl connects pedal arrangement 14 pneumatically to valve 16; and the second branch connects pedal arrangement 14 pneumatically to two rear ABS modulators 24, 25.
  • ABS modulator 24 regulates compressed-air supply to a corresponding pneumatic/hydraulic converter 26, which converts the incoming energy, in the form of compressed air, to hydraulic energy to power a corresponding rear right brake 27 of a rear right wheel (not shown) fitted to an axle AXL2 with a conventional differential DF2.
  • ABS modulator 25 regulates compressed-air supply to a corresponding pneumatic/hydraulic converter
  • a speed sensor SS3 and speed sensor SS4 are provided for determining the speed of the rear right wheel and rear left wheel respectively.
  • ABS modulators 24, 25 and rear-wheel speed sensors SS3, SS4 are also connected electrically to electronic central control unit CNT.
  • valve 30 (more specifically, between valve 16 and an adjustable coupling 31 forming part of assembly BTG) is interposed an electric valve 30, through which flows the adjustable low-pressure compressed air flowing along first branch
  • Electric valve 30 is a normally-open type controlled by electronic central control unit CNT.
  • System 10 operates as follows:
  • the teachings of the present invention also apply to any electronically controlled brake system, such as the brake-by-wire system.
  • the teachings of the present invention may also be applied to three- channel systems (i.e. with two ABS modulators for the rear wheels, and one ABS modulator for both the front wheels), or even to two-channel systems (i.e. with only two ABS modulators for the rear wheels) .
  • the system according to the present invention provides for the following functions: (1) ABS electronic braking;
  • DDC Dynamic drift control

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Regulating Braking Force (AREA)
  • Non-Deflectable Wheels, Steering Of Trailers, Or Other Steering (AREA)

Abstract

An electronically controlled brake system (10) for trailer tractors. The system (10) having: - a device (14) for braking the tractor and trailer, and for steer-by-braking (SBF) the tractor only; - tractor brakes (21, 23, 27, 29); - further devices (16, 30, BTG) for braking the trailer only. And the system (10) being characterized in that the further devices (16, 30, BTG) include a normally-ON valve (30) allowing simultaneous braking of the tractor and trailer; and the valve (30) is switched to OFF when the steer-by-braking function (SBF) is activated.

Description

ELECTRONICALLY CONTROLLED BRAKE SYSTEM FOR TRAILER TRACTORS
The present invention relates to an electronically controlled brake system for trailer tractors.
A major problem of trailer tractors with a steer- by-braking function (SBF) is preventing the trailer from braking, and therefore swerving of the tractor/trailer as a whole, when the (SBF) function is activated (i.e. by the driver to steer the tractor to the right or left) .
The present invention relates to an electronically controlled brake system designed to solve the above problem.
A non-limiting embodiment of the present invention will be described by way of example with reference to the attached drawing.
Number 10 in the attached drawing indicates as a whole an electronically controlled brake system, in particular for tractors, in accordance with the present invention .
System 10 comprises a compressor 11 for supplying compressed air to an air-processing - substantially air- dehumidifying - unit 12.
The processed air is stored in two parallel tanks 13a, 13b, both connected pneumatically to a pedal arrangement 14 which provides for both normal braking and steer-by-braking (SBF) of the tractor.
As is known, with this type of pedal arrangement
14, when the driver presses the left (or right) pedal only, the brake system only brakes the rear left (or right) wheel, thus reducing the turn radius of the tractor, especially during headland manoeuvres.
A circuit 15 is connected to tank 13a to feed high- pressure (e.g. 8-bar) air to a brake valve 16 of a trailer (not shown) and to a high-pressure coupling 17 forming part of an assembly BTG for pneumatic connection to the trailer brake system (not shown) .
As shown in the attached drawing, a first adjustable low-pressure air circuit Cl and a second adjustable low-pressure air circuit C2 originate from pedal arrangement 14.
First circuit Cl comprises two branches Rl, R2, of which a first branch Rl connects pedal arrangement 14 pneumatically to the trailer brake valve 16, and a second branch R2 connects pedal arrangement 14 pneumatically to two front ABS modulators 18, 19.
ABS modulator 18 regulates compressed-air supply to a corresponding pneumatic/hydraulic converter 20, which converts the incoming energy, in the form of compressed air, to hydraulic energy to power a corresponding front right brake 21 of a front right wheel (not shown) fitted to an axle AXLl with a conventional differential DFl.
Likewise, ABS modulator 19 regulates compressed-air supply to a corresponding pneumatic/hydraulic converter 22, which converts the incoming energy, in the form of compressed air, to hydraulic energy to power a corresponding front left brake 23 of a front left wheel (not shown) also fitted to axle AXLl. A speed sensor SSl and speed sensor SS2 are provided for determining the speed of the front right wheel and front left wheel respectively.
ABS modulators 18, 19 and front-wheel speed sensors SSl, SS2 are connected electrically to an electronic central control unit CNT for the reasons explained below.
Second circuit C2 comprises two branches RMl and RM2.
Like branch Rl of circuit Cl, a first branch RMl connects pedal arrangement 14 pneumatically to valve 16; and the second branch connects pedal arrangement 14 pneumatically to two rear ABS modulators 24, 25.
ABS modulator 24 regulates compressed-air supply to a corresponding pneumatic/hydraulic converter 26, which converts the incoming energy, in the form of compressed air, to hydraulic energy to power a corresponding rear right brake 27 of a rear right wheel (not shown) fitted to an axle AXL2 with a conventional differential DF2.
Likewise, ABS modulator 25 regulates compressed-air supply to a corresponding pneumatic/hydraulic converter
28, which converts the incoming energy, in the form of compressed air, to hydraulic energy to power a corresponding rear left brake 29 of a rear left wheel (not shown) also fitted to axle AXL2.
A speed sensor SS3 and speed sensor SS4 are provided for determining the speed of the rear right wheel and rear left wheel respectively. ABS modulators 24, 25 and rear-wheel speed sensors SS3, SS4 are also connected electrically to electronic central control unit CNT.
Between valve 16 and trailer brake assembly BTG
(more specifically, between valve 16 and an adjustable coupling 31 forming part of assembly BTG) is interposed an electric valve 30, through which flows the adjustable low-pressure compressed air flowing along first branch
RMl of circuit C2 to assembly BTG.
Electric valve 30 is a normally-open type controlled by electronic central control unit CNT.
System 10 according to the present invention operates as follows:
(A) To simply brake the tractor and trailer (if any) , the driver acts accordingly on pedal arrangement 14; compressed air, adjustable according to driver operation of pedal arrangement 14, is supplied simultaneously to the four ABS modulators 18, 19, 24, 25, thus initiating braking of all four wheels, which is regulated electronically by electronic central control unit CNT using ABS logic.
(B) To simply brake the tractor towing a trailer, electric valve 30 is open, and so permits adjustable-air flow from valve 16 to assembly BTG. (C) Conversely, to implement the steer-by-braking function (SBF) using pedal arrangement 14, since nothing is gained - in fact, driver safety is even jeopardized - by also involving the trailer, electronic central control unit CNT closes electric valve 30 to cut off adjustable-air supply to assembly BTG.
(D) The four wheel speeds detected by sensors SSl, SS2, SS3, SS4 and transmitted to electronic central control unit CNT obviously also play their part in controlling both normal braking of the four wheels (with electric valve 30 open) , and steer-by-braking (SBF)
(with electric valve 30 closed) of either the rear right wheel by brake 27, or the rear left wheel by brake 29, depending on the desired turn direction. Though the above description with reference to the attached drawing refers to a particular electronic system employing ABS logic, the teachings of the present invention also apply to any electronically controlled brake system, such as the brake-by-wire system. Similarly, though the above description refers to a system comprising four ABS modulators, the teachings of the present invention may also be applied to three- channel systems (i.e. with two ABS modulators for the rear wheels, and one ABS modulator for both the front wheels), or even to two-channel systems (i.e. with only two ABS modulators for the rear wheels) .
The system according to the present invention provides for the following functions: (1) ABS electronic braking;
(2) Electronic steer-by-braking (e-SBF) ;
(3) Yaw moment control (YMC) ;
(4) Cornering brake control (CBC) for stabilizing and preventing the tractor from swerving when braking around bends; this control operates with no intervention on the part of the ABS system;
(5) Dynamic drift control (DDC) for stabilizing the vehicle when braking around bends, and preventing swerving during intervention of the ABS system; and
(6) Electronic brake distribution (EBD) to avoid damaging the clutch.

Claims

1) An electronically controlled brake system (10) for trailer tractors; the system (10) comprising: - means (11, 12, 13a, 13b, 15, Cl, C2) for producing and distributing compressed fluid;
- means (14) for braking the tractor and trailer, and for steer-by-braking (SBF) the tractor only;
- compressed-fluid modulating means (18, 19, 24, 25) for activating tractor brakes (21, 23, 27, 29); said modulating means (18, 19, 24, 25) being connected electrically to a brake-control electronic central control unit (CNT) ; further means (16, 30, BTG) for braking the trailer only; and the system (10) being characterized in that said further means (16, 30, BTG) comprise normally-ON valve means (30) normally allowing simultaneous braking of the tractor and trailer; said valve means (30) being controlled by said electronic central control unit (CNT) to switch to OFF when the steer-by-braking function (SBF) is activated.
2) A system (10) as claimed in Claim 1, characterized in that said modulating means (18, 19, 24, 25) act on pneumatic/hydraulic converting means (20, 22, 26, 28) which convert the incoming energy, in the form of compressed air, to hydraulic energy to power corresponding brakes (21, 23, 27, 29) . 3) A system (10) as claimed in either of the foregoing Claims, characterized in that said electronic central control unit (CNT) controls said modulating means (18, 19, 24, 25) . 4) A system (10) as claimed in any one of the foregoing Claims, characterized in that said electronic central control unit (CNT) acquires and process signals indicating the instantaneous speeds of the tractor wheels . 5) A system (10) as claimed in Claim 4, characterized in that said signals indicating the instantaneous speeds of the tractor wheels are supplied by a number of sensors (SSl, SS2, SS3, SS4), each located at a respective wheel. 6) A system (10) as claimed in any one of the foregoing Claims, characterized in that said means (14) for braking the tractor and trailer, and for steer-by-braking (SBF) the tractor only; and - said compressed-fluid modulating means (18, 19, 24, 25) acting on said converting means (20, 22, 26, 28) and for activating tractor brakes (21, 23, 27, 29); form part of an ABS brake system.
7) A system (10) as claimed in any one of Claims 1 to 5, characterized in that said means (14) for braking the tractor and trailer, and for steer-by-braking (SBF) the tractor only; and - said compressed-fluid modulating means (18, 19, 24, 25) acting on said converting means (20, 22, 26, 28) and for activating tractor brakes (21, 23, 27, 29); form part of a brake-by-wire system. 8) A system (10) as claimed in any one of Claims 1 to 6, characterized by comprising four ABS modulators.
9) A system (10) as claimed in any one of Claims 1 to 6, characterized by comprising three ABS modulators, i.e. two ABS modulators for the rear wheels, and one ABS modulator for both the front wheels.
10) A system (10) as claimed in any one of Claims 1 to 6, characterized by comprising two ABS modulators for the rear wheels.
PCT/EP2009/051586 2008-02-21 2009-02-11 Electronically controlled brake system for trailer tractors WO2009103645A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2010547150A JP2011514279A (en) 2008-02-21 2009-02-11 Electronically controlled brake system for trailer tractor
RU2010138820/11A RU2484991C2 (en) 2008-02-21 2009-02-11 Electronically controlled braking system for tractors with trailers
US12/918,712 US8967734B2 (en) 2008-02-21 2009-02-11 Electronically controlled brake system for trailer tractors
BRPI0907491-0A BRPI0907491B1 (en) 2008-02-21 2009-02-11 ELECTRONICALLY CONTROLLED BRAKE SYSTEM FOR TRAILER TRACTORS

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP08425107.3 2008-02-21
EP08425107.3A EP2093117B1 (en) 2008-02-21 2008-02-21 Electronically controlled brake system for trailer tractors

Publications (1)

Publication Number Publication Date
WO2009103645A1 true WO2009103645A1 (en) 2009-08-27

Family

ID=39624647

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/051586 WO2009103645A1 (en) 2008-02-21 2009-02-11 Electronically controlled brake system for trailer tractors

Country Status (6)

Country Link
US (1) US8967734B2 (en)
EP (1) EP2093117B1 (en)
JP (1) JP2011514279A (en)
BR (1) BRPI0907491B1 (en)
RU (1) RU2484991C2 (en)
WO (1) WO2009103645A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013004315A1 (en) 2011-07-04 2013-01-10 Cnh Italia S.P.A. Method of and apparatus for braking a tractor-trailer combination
WO2013004314A1 (en) 2011-07-04 2013-01-10 Cnh Italia S.P.A Method of and apparatus for braking a tractor-trailer combination

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMO20120320A1 (en) * 2012-12-21 2014-06-21 Cnh Italia Spa METHOD AND APPARATUS FOR CHECKING THE BRAKING OF A TRAILER TRAILER COMBINATION.
US9758140B2 (en) 2015-12-16 2017-09-12 Bendix Commercial Vehicle Systems Llc System and method for controlling pneumatic control signal
DE102019114270A1 (en) * 2019-05-28 2020-12-03 Wabco Gmbh Electronically controlled pneumatic brake system with two single-channel axle modulators and ABS valves as well as the vehicle with such a brake system
US11807206B2 (en) 2021-03-25 2023-11-07 Toyota Research Institute, Inc. Emergency maneuvering using lateral sliding

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US2366310A (en) * 1943-01-07 1945-01-02 Wagner Electric Corp Combined air-hydraulic actuating system
DE9206185U1 (en) * 1992-05-08 1993-09-09 Lucas Ind Plc Hydraulic steering brake system for vehicles
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US20050209762A1 (en) * 2004-03-18 2005-09-22 Ford Global Technologies, Llc Method and apparatus for controlling a vehicle using an object detection system and brake-steer
WO2007131758A1 (en) * 2006-05-16 2007-11-22 Vhit S.P.A. A valve for disconnecting the front braking and/or the trailer braking, for a farm tractor or a similar vehicle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013004315A1 (en) 2011-07-04 2013-01-10 Cnh Italia S.P.A. Method of and apparatus for braking a tractor-trailer combination
WO2013004314A1 (en) 2011-07-04 2013-01-10 Cnh Italia S.P.A Method of and apparatus for braking a tractor-trailer combination

Also Published As

Publication number Publication date
US8967734B2 (en) 2015-03-03
RU2484991C2 (en) 2013-06-20
BRPI0907491B1 (en) 2019-09-24
BRPI0907491A2 (en) 2015-07-14
RU2010138820A (en) 2012-03-27
JP2011514279A (en) 2011-05-06
EP2093117A1 (en) 2009-08-26
US20110057507A1 (en) 2011-03-10
EP2093117B1 (en) 2016-04-06

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