GB2467101A - Tipper trailer brake control - Google Patents

Tipper trailer brake control Download PDF

Info

Publication number
GB2467101A
GB2467101A GB0821796A GB0821796A GB2467101A GB 2467101 A GB2467101 A GB 2467101A GB 0821796 A GB0821796 A GB 0821796A GB 0821796 A GB0821796 A GB 0821796A GB 2467101 A GB2467101 A GB 2467101A
Authority
GB
United Kingdom
Prior art keywords
trailer
truck
tipper
controlling
brake pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB0821796A
Other versions
GB2467101B (en
GB0821796D0 (en
Inventor
Matthew Fry
Colin Ross
Stefan Pahl
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 Nutzfahrzeuge GmbH
Knorr Bremse Systems for Commercial Vehicles Ltd
Original Assignee
Knorr Bremse Systeme fuer Nutzfahrzeuge 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 Nutzfahrzeuge GmbH, Knorr Bremse Systems for Commercial Vehicles Ltd filed Critical Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Priority to GB0821796.0A priority Critical patent/GB2467101B/en
Publication of GB0821796D0 publication Critical patent/GB0821796D0/en
Publication of GB2467101A publication Critical patent/GB2467101A/en
Application granted granted Critical
Publication of GB2467101B publication Critical patent/GB2467101B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • B60P—VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
    • B60P1/00—Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading
    • B60P1/04—Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading with a tipping movement of load-transporting element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60P—VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
    • B60P1/00—Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading
    • B60P1/04—Vehicles predominantly for transporting loads and modified to facilitate loading, consolidating the load, or unloading with a tipping movement of load-transporting element
    • B60P1/28—Tipping body constructions
    • B60P1/283—Elements of tipping 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
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/1701—Braking or traction control means specially adapted for particular types of vehicles
    • 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
    • B60T8/171—Detecting parameters used in the regulation; Measuring values used in the regulation
    • 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
    • B60T8/18—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 vehicle weight or load, e.g. load distribution
    • 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

Abstract

An apparatus for controlling a tipper trailer or truck with a raisable body 201, e.g. when the vehicle is discharging a load e.g. into a road surface laying or paving machine, has a brake system with a braking ECU (fig 2) to control braking pressure to at least one wheel of the tipper trailer or truck. An accelerometer detects a change in acceleration due to the inclination of the tipper trailer or truck. If the gradient of the road changes, the accelerometer provides a signal to the brake system, so that the brake pressure to the tipper can be adjusted.

Description

Road Laying Apparatus The invention relates to road laying apparatus and in particular a brake system for such apparatus and a method of operating the brake system.
Asphalt or concrete roads are commonly laid using a paving machine. The paving machine has a hopper, which feeds the asphalt to a conveyor system, which then allows the paving machine to apply the material to the ground surface and then to screed the material to form the road surface as the paving machine is advanced across the ground surface.
Due to the volume of material that needs to be used, it is common for the material to be fed from a tipper truck or trailer into the hopper. To do this continuously, the tipper is put into neutral and a light brake pressure applied to its brakes so that the truck or trailer does not roll away on an incline. The paving machine in use then pushes the tipper as it advances across the road surface and can therefore be constantly topped up. As the load on the tipper varies greatly from full to empty, the light brake pressure is adjusted in dependence on the measured load on the tipper.
This is typically determined by monitoring the pressure in the air springs of the tipper.
The known systems suffer from the drawback that the brake pressure is not dynamic and requires manual intervention, in particular if the gradient of the road changes.
The present invention seeks to overcome this problem by providing for an automatic adjustment of the brake pressure applied to the tipper.
According to the invention there is provided apparatus for controlling a tipper trailer or truck having a brake system, which brake system comprises a braking ECU adapted to control braking pressure to at least one wheel of the tipper trailer or truck, an accelerometer adapted to detect a change in acceleration due to the inclination of the tipper trailer or truck, the output of the accelerometer being passed to the braking ECU such that the braking pressures to the at least one wheel is adjustable in response to the output of the accelerometer.
Preferably, the apparatus detects that the trailer or truck is stationery and that a raisable body has been raised before the braking pressure is adjusted. Preferably, where the trailer or truck is adapted to discharge a load from an end, if the output of the accelerometer indicates that the trailer or truck is on an upward incline with respect to the end, the brake pressure is reduced compared to the brake pressure applicable when the trailer or truck is substantially horizontal. Preferably, where the trailer or truck is adapted to discharge a load from an end, if the output of the accelerometer indicates that the trailer or truck is on an downward incline with respect to the end, the brake pressure is increased compared to the brake pressure applicable when the trailer or truck is substantially horizontal. Preferably, the brake pressure applicable when the trailer or truck is substantially horizontal is 1.0 bar.
Preferably, the brake pressure applicable on an upward incline is 0.5 bar. Preferably the brake pressure applicable on a downward incline 1.5 bar.
The solution according to the invention eliminates the need for manual intervention on the braking system of the trailer or truck when the load is being dispensed into a paving machine during use at very low cost thereby enhancing the safety of road laying machines.
An exemplary invention will now be described in greater detail with reference to the drawings in which: Fig. 1 shows a schematic of a trailer with its body raised Fig. 2 shows a typical schematic of an ECU for a commercial vehicle brake system Figure 1 shows a schematic of a trailer that is provided with a raisable body 201 in the raised position, so that the trailer's cargo can be discharged through the rear of the body 204. Such trailers are commonly used for transporting building materials including asphalt. Tipping trucks, where the raisable body is mounted on the truck chassis, are also common. The raisable body is raised by means of a hydraulically driven strut 202, which will typically be powered from a hydraulic pump powered from a tractor's drive train. In use, the vehicle is placed into neutral and the body will be raised so that the load can be fed slowly to the hopper of a paving machine. The paving machine will then push the trailer along as the asphalt is laid on the ground to form the road surface The trailer is provided with a longitudinal acceleration sensor described in more detail with reference to Figure 2, which is adapted to detect and measure any longitudinal acceleration on the trailer body. The output of the acceleration sensor is passed to the trailer brake control unit. The microcomputer or ECU comprises an EEPROM as a non-volatile storage memory means in which the memory is divided into two blocks.
The first block comprises the main safety critical control parameters in particular those related to the actuation and operation of the vehicle brakes. The second block of memory comprises a discretely programmable storage means for carrying operating data relating to one or more auxiliary functions. This separation ensure the security of safety critical functions.
Figure 2 shows a schematic of an electronic control unit (ECU) for a commercial vehicle brake system. The ECU receives inputs from a variety of sensors, which may include wheel speed sensors 1, pressure sensors in the brake system, a lateral acceleration sensor 2 and other auxiliary sensors. The outputs of these sensors are fed via a respective input stage 6 to one of two microcomputers 7. The microcomputers 7 comprise a RAM for volatile memory storage and an EEPROM for programmable non-volatile memory storage. The two microcomputers 7 are adapted to talk to each other for reasons of redundancy. The microcomputers 7 then communicate via output stages 8, which output stages are in turn adapted to communicate to control the pressure control valves 9 of the brake system. The microcomputers 7 are also adapted to directly signal to a warning lamp or alarm 11.
The ECU is also adapted to control the lift axle control valve 12, retarder valve 13 and relay valve 14. The ECU is powered from a power supply 5 charged by the vehicle battery 4.
The trailer or truck of the invention is provided with an accelerometer adapted to measure acceleration in a longitudinal direction on the trailer. The accelerometer is mounted on the chassis such that its output varies in dependence on the angle to the vertical with respect to the longitudinal direction of the vehicle. The output of the accelerometer is passed to the ECU 7, which in turn can be programmed to manipulate the brake pressure in response to its output.
In a first example, if the accelerometer detects that the trailer is located on a substantially horizontal surface and the trailer is placed into neutral, which can be detected by monitoring the park brake status, and that the raisable body is raised, the ECU 7 will apply a brake pressure to the wheels of approximately 1.0 bar. However, if the output of the accelerometer indicates that the trailer is on an upslope, the ECU 7 will reduce the brake pressure to 0.5 bar. Conversely, if the output of the accelerometer indicates that the trailer is on a downslope, the ECU 7 will increase the brake pressure to around 1.5 bar to stop the trailer from running away down the slope.
Whilst longitudinal accelerometers are not known in the field of trailers, lateral acceleration sensors are now standard on trailer braking systems. It would therefore be possible to use a twin axis accelerometer adapted to measure both longitudinal acceleration due to the declination of the trailer and any lateral acceleration due to a loss of stability.

Claims (8)

  1. Claims 1 Apparatus for controlling a tipper trailer or truck having a brake system, which brake system comprises a braking ECU adapted to control braking pressure to at least one wheel of the tipper trailer or truck, an accelerometer adapted to detect a change in acceleration due to the inclination of the tipper trailer or truck, the output of the accelerometer being passed to the braking ECU such that the braking pressures to the at least one wheel is adjustable in response to the output of the accelerometer.
  2. 2. Apparatus for controlling a tipper trailer or truck according to Claim 1, wherein the apparatus detects that the trailer or truck is stationery and that a raisable body has been raised before the braking pressure is adjusted.
  3. 3. Apparatus for controlling a tipper trailer or truck according to Claims I or Claim 2, wherein where the trailer or truck is adapted to discharge a load from an end, if the output of the accelerometer indicates that the trailer or truck is on an upward incline with respect to the end, the brake pressure is reduced compared to the brake pressure applicable when the trailer or truck is substantially horizontal.
  4. 4. Apparatus for controlling a tipper trailer or truck according to any one of Claims 1 to 3, wherein, where the trailer or truck is adapted to discharge a load from an end, if the output of the accelerometer indicates that the trailer or truck is on an downward incline with respect to the end, the brake pressure is increased compared to the brake pressure applicable when the trailer or truck is substantially horizontal.
  5. 5. Apparatus for controlling a tipper trailer or truck according to any one of Claims 1 to 4, wherein the brake pressure applicable when the trailer or truck is substantially horizontal is 1.0 bar.
  6. 6. Apparatus for controlling a tipper trailer or truck according to any one of Claims 1 to 5, wherein the brake pressure applicable on an upward incline is 0.5 bar.
  7. 7. Apparatus for controlling a tipper trailer or truck according to any one of Claims 1 to 6, wherein the brake pressure applicable on a downward incline is 1.5 bar.
  8. 8. Apparatus for controlling a tipper trailer or truck substantially as describe herein, with reference to and as illustrated in the accompanying drawings.
GB0821796.0A 2008-11-28 2008-11-28 Road laying apparatus Expired - Fee Related GB2467101B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0821796.0A GB2467101B (en) 2008-11-28 2008-11-28 Road laying apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0821796.0A GB2467101B (en) 2008-11-28 2008-11-28 Road laying apparatus

Publications (3)

Publication Number Publication Date
GB0821796D0 GB0821796D0 (en) 2009-01-07
GB2467101A true GB2467101A (en) 2010-07-21
GB2467101B GB2467101B (en) 2013-05-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB0821796.0A Expired - Fee Related GB2467101B (en) 2008-11-28 2008-11-28 Road laying apparatus

Country Status (1)

Country Link
GB (1) GB2467101B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201503865D0 (en) * 2015-03-06 2015-04-22 Hyva Holding Bv Method and system for determining the load mass in a tipper body

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008086087A2 (en) * 2007-01-03 2008-07-17 Ken Degrave Hybrid trailer system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008086087A2 (en) * 2007-01-03 2008-07-17 Ken Degrave Hybrid trailer system

Also Published As

Publication number Publication date
GB2467101B (en) 2013-05-01
GB0821796D0 (en) 2009-01-07

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Free format text: REQUEST FOR REINSTATEMENT FILED

Effective date: 20100603

S20A Reinstatement of application (sect. 20a/patents act 1977)

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Effective date: 20100616

PCNP Patent ceased through non-payment of renewal fee

Effective date: 20201128