GB2497131A - Trailer having a hill hold function - Google Patents

Trailer having a hill hold function Download PDF

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Publication number
GB2497131A
GB2497131A GB1120747.9A GB201120747A GB2497131A GB 2497131 A GB2497131 A GB 2497131A GB 201120747 A GB201120747 A GB 201120747A GB 2497131 A GB2497131 A GB 2497131A
Authority
GB
United Kingdom
Prior art keywords
text
trailer
brake pressure
brake
braking
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.)
Withdrawn
Application number
GB1120747.9A
Other versions
GB201120747D0 (en
Inventor
Matthew Fry
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.)
Knorr Bremse Systeme fuer Schienenfahrzeuge GmbH
Knorr Bremse Systems for Commercial Vehicles Ltd
Original Assignee
Knorr Bremse Systeme fuer Schienenfahrzeuge GmbH
Knorr Bremse Systems for Commercial Vehicles Ltd
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 Knorr Bremse Systeme fuer Schienenfahrzeuge GmbH, Knorr Bremse Systems for Commercial Vehicles Ltd filed Critical Knorr Bremse Systeme fuer Schienenfahrzeuge GmbH
Priority to GB1120747.9A priority Critical patent/GB2497131A/en
Publication of GB201120747D0 publication Critical patent/GB201120747D0/en
Publication of GB2497131A publication Critical patent/GB2497131A/en
Withdrawn legal-status Critical Current

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
    • B60T7/00—Brake-action initiating means
    • B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
    • B60T7/122—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger for locking of reverse movement
    • 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
    • B60T13/683—Electrical control in fluid-pressure brake systems by electrically-controlled valves in pneumatic 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
    • B60T7/00—Brake-action initiating means
    • B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
    • B60T7/20—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger specially for trailers, e.g. in case of uncoupling of or overrunning by trailer
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T2201/00—Particular use of vehicle brake systems; Special systems using also the brakes; Special software modules within the brake system controller
    • B60T2201/06—Hill holder; Start aid systems on inclined road

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Regulating Braking Force (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

A trailer braking system comprising a braking ECU 13 arranged to receive a signal indicating that the trailer is stationary and a brake pressure demand signal. An air brake reservoir 27 is connected with a supply input of the breaking ECU 13 and an ABS valve 32. The ABS valve 32 is assigned to brake cylinders 18, 19. Two electric control inputs are sent from the ABS valve 32 to the braking ECU 13 by electric line 35 and a pneumatic control input 36 which is connected to the pneumatic control connection 23 by a return valve 37. The pneumatic control input 36 is connected by a pneumatic control line 38 with a pneumatic control input of the pressure control module 13. The pressure control module 13 has an integrated pressure sensor which measures the pressure in the pneumatic control line 38. If the braking ECU 13 detects a drop in brake pressure demand, brake pressure is held for a predetermined period of time and then released to the actual brake pressure demand to thereby provide a hill hold function in a trailer.

Description

Trailer Electronic Brakina System The invention relates to a trailer &ectronic braking system.
Hill hold systems which prevent a vehicle loin, rolling away during a hill start are flow a common feature on passenger cars. A hill hold system detects whether a vehicle is on a slope and applies the brakes tbr approximately 2s, so that the driver can put the clutch at the friction point and press thc accelerator pedal without the vehicle rolling away. [he feature is also available for commercial vehicles but due to cost considerations, it is not often specified. it is also not generally possible to retrofit hill hold functionality in a commercial vehicle, brake system as it would require a re-proamming and retesting of the brake syst.Irailer braking systems do not have a hill hold function as the trailer brake pressure control module is desiied to Ibliow the truck brake pressure as closely as possible The present invention seeks to provide an electronic braldug system for use in a commercial vehicle trailer combination.
According to the invention there is provided a braking system for use with a trailer, the braking system comprising a braking device capable of generating a braking force on an axle on the trailer, a brake force into the brake cylinders being controllable by a braking ECU. wherein the braking ECU receives a signal indicating that the trailer is stationary and a brake pressure demand, wherein in the event that the braking ECU detects a drop in brake pressure dcnrnnd, the brake pressure is held for a pre determined period of time and then released to the actual brake pressure demand.
Preferably, the braking ECU receives a signal from wheel speed sensors on the trailer and/or a truck connected to the trailer. Preferably, the braking ECU receives a signal indicating whether a brake pedal on a truck connected to the trailer is depressed.
Preferably, the braking ECu is adapted to monitor the brake pressure demand and determine whether a peak in pressure demand has been reached. Preferably, the brake pressure is h&d only when the brake pressure is eater than i bar, Preferably, the brake pressure is held when the brake pressure drops by approximately 200mBar.
Preferably, the brake pressure is held for approximately 2s before being released. *1 2.
Preferably, the trailer is provided with an accelerometer adapted to measure acceleration in a longitudinal axis of the trailer arid thereby detect whether the trailer is on a slope in the invention, counter--intuitively, a delay is built into the trailer brake pressure control algorithm unlike kncsvn systems which seek to minimise the delay and eliminate causes of time lag between the truck and trailer brake pressure responses.
The invention provides for a low cost hill hold solution on a truck trailer combination that is additionally and advantageously retrofittabie to the trailer.
Exemplary embodiments of the invention will now be described in &eater detail with reference to the drawings in which: Fig. I shows a trailer electronic braking system The utility vehicle trailer has a steerable front axle with front wheeLs 1, 2 and a rear axle with rear wheels 3, 4. Rotational wheel speed sensors 5--S are in each case assigned to the front wheels 1, 2 and the rear wheels 3,4, and are connected by way of electric lines 9-12 with an electropneumatic brake pressure control module 13 (PBS module) which is primarily assigned to the rear axle brakes. One brake 14-17 is in each case assigned to the front wheels 1, 2 and the rear wheels 3 4, which brake 14- 17 can be applied by means of brake cylinders 18, 19 of the front axe or spring-goaded brake cylinders 20, 21 of the rear axle.
The braking system of the trailer vehicle can be connected by way of three connectIons, specifically a pneumatic supply line connection 22, a pneumatic control line connection 23 and an electric control connection 24, with the braking system of a tractor or a further trailer.
The supply line connection 22 is connected by way of a return valve 25 and a parking valve 26 with an air brake reservoir 27. From the air l,rake reservoir 27, a. pneumatic line 28, 31 leads to a supply input of the pressure control module 13 and ABS valve 32. n addition, a pneumatic line 29 branches off the parking valve 26 to the pressure control module 13. A pneumatic line 30 extends between the parking valve 26 and the air brake reservoir 27.
The ABS valve 32 is assigned Jointly to both brake cylinders 18. 19 of the front axle and is connected xvith the brake cylinder 18 by way of a pneumatic line 33 and with the brake cylinder 19 by way of a pneumatic Line 34. The ABS valve 32 has two electric control inputs which are connected by way of one' electric line 35 shown here only schematically with the pressure control module 13.
Furthermore, the ABS valve 32 has a pneumatic control input 36 which is connected l,y way of a return valve 37 with the pneumatic control connection 23. The pneumatic contro' input 36 is also connected. by way of a pneumatic control line 38 with a pneumatic control input of the pressure control module 12. The pressure control module 13 has an integrated pressure sensor (not shown) which measures the pressure in the pneumatic control line 38. that is, the control pressure present at the pneumatic control input 36 of the ABS valve, which control pressure is identical to the maximal pressure which can be controlled into the brake cylinders 18, 19.
The pressure control module 13 has pneumatic outputs 39 42 which are connected by way of assiwied pneumatic lines with the spring brake cylinders 20 or 21.
Furthermore, pneumatic axle load sensors or air bellows 43, 44 are provided at the rear axle and permit a determination of the axle load, parlicularly of the dynamic axle load during braking and starting. The axle load sensors 43, 44 are connected by way of electric lines with the pressure control module 1 3 which is shown here only as an example by means of the electric line 55. Correspondingly axle load sensors 45, 46 may be. provided at the front axle. However, the axle load sensors 45,46 are not absolutely necessary.
To provide stability control a lateral acceleration sensor 50 is provided, which may also he integrated with a yaw sensor, and the output of the lateral acceleration sensor is fed. to the pressure control module/ECU 13. Typically the lateral acceleration sensor is integrated into the pressure control module/ECU 13. inn the event that lateral acceleration on the trailer is detected, the pressure control module can provide for increased brake force at the front and/or rear axles. When the lateral acceleration sensor 50 detects lateral acceleration on the trailer in which it is installed, the sensor generates a siwlal setting the stability control to active.
With respect to the embodiment described to Figure 1, the ABS valve 32 may be replaced with an electro-pneumatie valve where the electric control line 35 consists of a commutation means preferably CAN! and an electric power source.
The pressure control module 13 receives data from the wheel speed sensors on the trailer and also receives a siia1 indicating whether the brake pedal in the vehicle cab is depressed or not, as well as the brake pressure demand.
In the event that the pressure control module detects that the vehicle is stationary and that the brake pedal is depressed and/or the brake pressure demand is eater than approximately I bar, These conditions strongly imply that the vehicle is being held on a slope or hill. The pressure control module then looks for a pea.k in brake pressure demand whilst these conditions are maintained, When the brake pressure demand reduces by 200 niBar below the peak pressure, the brake pressure is held for approximately 2 seconds before being released. This enables the driver to engage tile clutch without the trailer rolling away.
It would also be possible to detect if the trailer is on a slope by the use of an accelerometer arranged in the iontudinai axis of the trailer. This could be either a standalone accelerometer or, alternatively, the accelerometer could be a twin axis aceeleronieter.

Claims (1)

  1. <claim-text>Claims I. A braking system for use with a trailer, the braking system comprising a braking device capable of generating a braking force on an axle on the trailer, a brake force into the brake cylinders being controllable by a hraking ECU, wherein the braking F-CU receives a signal indicating that the trailer is stationaiy and a brake pressure demand, wherein in the event that the b-raking ECU detects a drop in brake pressure demand, the brake pressure is held for a predetermined period of time and then released to the actual brake pressure demand.</claim-text> <claim-text>2. A braking system according to Claim I, wherein the braking ECU receives a signal from wheel speed sensors on the trailer and/or a truck connected to the trailer.</claim-text> <claim-text>3, A braking system according to Claim 1 or Claim 2, wherein the braking ECU receives a signal indicating whether a brake pedal on a truck connected to the trailer is depressed.</claim-text> <claim-text>4. A braking system according to any one of Claims 1 to 3, wherein the braking ECU is adapted to monitor the brake pressure demand and determine whether a peak in pressure demand has been reached.</claim-text> <claim-text>5, A braking system according to any one of Claims I to 4, wherein the brake pressure is held only when the brake pressure is greater than i bar.</claim-text> <claim-text>6. A braking system according to any one of Claims i to 5, wherein the brake pressure is held when the brake pressure drops by approximately 200mBar.</claim-text> <claim-text>7. A braking system according to any one of Claims I to 6, wherein the brake pressure is held for approximately 2s before being released.</claim-text> <claim-text>8, A braking system according to any one of Claims I to 7, wherein the trailer is provided with an accelerometer adapted to measure acceleration in a longitudinal axis of the trailer and thereby detect whether the trailer is on a slope.</claim-text> <claim-text>9. A braking system substantially as described herein, by reference to, and as illustrated in, the accompanying drawing.</claim-text>
GB1120747.9A 2011-12-02 2011-12-02 Trailer having a hill hold function Withdrawn GB2497131A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1120747.9A GB2497131A (en) 2011-12-02 2011-12-02 Trailer having a hill hold function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1120747.9A GB2497131A (en) 2011-12-02 2011-12-02 Trailer having a hill hold function

Publications (2)

Publication Number Publication Date
GB201120747D0 GB201120747D0 (en) 2012-01-11
GB2497131A true GB2497131A (en) 2013-06-05

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Family Applications (1)

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GB1120747.9A Withdrawn GB2497131A (en) 2011-12-02 2011-12-02 Trailer having a hill hold function

Country Status (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015032457A1 (en) * 2013-09-04 2015-03-12 Wabco Gmbh Method of controlling an electronic braking system
CN109476296A (en) * 2016-09-21 2019-03-15 威伯科欧洲有限责任公司 For manipulating spring energy-storage-parking braking device parking braking-valve gear

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008115132A1 (en) * 2007-03-16 2008-09-25 Scania Cv Ab (Publ) Brake control system and method of controlling a braking system
EP2082933A1 (en) * 2008-01-24 2009-07-29 Eaton Corporation Foundation brake hill start aide system
US20110006591A1 (en) * 2008-03-04 2011-01-13 Toyota Jidosha Kabushiki Kaisha Braking apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008115132A1 (en) * 2007-03-16 2008-09-25 Scania Cv Ab (Publ) Brake control system and method of controlling a braking system
EP2082933A1 (en) * 2008-01-24 2009-07-29 Eaton Corporation Foundation brake hill start aide system
US20110006591A1 (en) * 2008-03-04 2011-01-13 Toyota Jidosha Kabushiki Kaisha Braking apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015032457A1 (en) * 2013-09-04 2015-03-12 Wabco Gmbh Method of controlling an electronic braking system
CN105492264A (en) * 2013-09-04 2016-04-13 威伯科有限公司 Method of controlling an electronic braking system
US9944260B2 (en) 2013-09-04 2018-04-17 Wabco Gmbh Method of controlling an electronic braking system
CN105492264B (en) * 2013-09-04 2019-10-11 威伯科有限公司 Method for controlling electric brake system
EP3041718B1 (en) * 2013-09-04 2020-11-25 WABCO GmbH Method of controlling an electronic braking system
CN109476296A (en) * 2016-09-21 2019-03-15 威伯科欧洲有限责任公司 For manipulating spring energy-storage-parking braking device parking braking-valve gear

Also Published As

Publication number Publication date
GB201120747D0 (en) 2012-01-11

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)