WO1984003262A1 - Systeme d'alarme de renversement - Google Patents

Systeme d'alarme de renversement Download PDF

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Publication number
WO1984003262A1
WO1984003262A1 PCT/GB1984/000050 GB8400050W WO8403262A1 WO 1984003262 A1 WO1984003262 A1 WO 1984003262A1 GB 8400050 W GB8400050 W GB 8400050W WO 8403262 A1 WO8403262 A1 WO 8403262A1
Authority
WO
WIPO (PCT)
Prior art keywords
shift
loading
signals
maximum
centre
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.)
Ceased
Application number
PCT/GB1984/000050
Other languages
English (en)
Inventor
John Harbour
Roger West
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.)
TRW Probe Electronics Co Ltd
Original Assignee
TRW Probe Electronics Co 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 TRW Probe Electronics Co Ltd filed Critical TRW Probe Electronics Co Ltd
Priority to AU26519/84A priority Critical patent/AU2651984A/en
Publication of WO1984003262A1 publication Critical patent/WO1984003262A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D49/00—Tractors
    • B62D49/08—Tractors having means for preventing overturning or tipping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q9/00—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling

Definitions

  • This invention relates to a roll-over warning system for motor vehicles having a load carrying chassis mounted on a wheel assembly with or without an intermediate suspension system.
  • Such vehicles particularly lorries and especially articulated lorries
  • negotiation of a bend at too great a speed can lead to rolling over.
  • the speed at which such rolling can take place may be quite low, particu larly if the bend is tight, such as on a roundabout.
  • French Patent No. 2,352,692 which relies on the optical detection of the surface of a bath of mercury exceeding a given angle in relation to the transvers plane of the vehicle.
  • Another is described in published British Specification No. 2,066,538A, which correlates vehicle speed with steering angle and, as well as operating an alarm, interferes with the vehicle controls when danger is approached.
  • a third technique is adopted in published British Specification No. 2,088,606A, which proposes
  • ⁇ accelerometers to measure lateral acceleration.
  • the first two take no account of vehicle loading, which is the most important factor in determining imminent roll over, and the proposal to over-ride the driver's controls, particularly the steering, is extremely dangerous.
  • the third system puts the accelerometers on the axle and the chassis respectively, and recognises that their movement is different as a result of a compliant suspension.
  • One part of the system relies on external indications of the nature of the bend to be negotiated, such as roadside signs or signal loops below the road surface, which do not exist and which are not likely to as the cost would be prohibitiv
  • the other part compares lateral accelerations and from them determines the roll angle of the chassis.
  • a roll-over warning device for vehicles having a chassis mounted on a wheel assembly or assemblies, the device comprising laterally spaced means on a wheel axle for producing electrical signals represen ⁇ tative of local loading means for combining said signals to determine the degree of shift of the effective centre of loading of the vehicle, means for comparing said shift signal with an electrical signal representative of a pre ⁇ determined maximum safe .shift,and means for operating a warning when the comparison indicates an approach to said maximum.
  • a roll-over warning device for vehicles having a chassis mounted on a wheel assembly or assemblies, the device comprising laterally spaced means for determining from said signals the rate and/or acceleration of shift of the effective centre of loading, means for calculating therefrom a predicted maximum shift of centre of loading, means for comparing this predicted maximum shift of centre of loading with a predetermined maximum safe shift, and means for operating a warning when the comparison indicates an approach to said maximum.
  • the chassis will be mounted by a compliant suspension on the wheel assembly or assemblies. There will then be means for combining said signals to determine total loading, and the calculating means will have an input for at least one parameter corresponding to the suspension compliance and damping for the determined load.
  • the load signals producing means are strain transducers, arranged to produce signals corresponding to axle bending moments. Such transducers may be of the form described in British Patent No. 2,050,62
  • Figure 1 is a diagrammatic end view of a vehicle equipped with transducers on an axle
  • Figure 2 is a block diagram of a vehicle roll- over warning device
  • Figure 3 shows characteristics obtainable from the axle transducers.
  • a load M which will include the chassis of the vehicle, is carried by a compliant suspensio indicated by arrowed lines 1 and 2 on an axle 3 having wheels 4 and 5.
  • Strain gauge transducers 6 and 7 are attached symmetrically to the axle either side of its centr point.
  • the suspension spacing is S
  • the transducer spacing is T
  • the wheel spacing is W
  • the height of the centre of mass of the load M above the axle is H.
  • the suspension forces are SL and SR (L and R indicating left and right as one looks at the figure)
  • the bending moments at the transducers are TL and TR
  • the ground reaction forces on the wheels are WL and WR.
  • a sideways force on the load as a result of cornering for example, is F.
  • TR-TR Mg T (W - S) (11)
  • the approach to the danger point is determined from the ratio k between the sum and difference responses of the sensors, and the critical value of this ratio depen on the vehicle constants of spacing between the sensors, and spacing between the suspension points.
  • the outputs of the strain gauges 6 and 7 are amplified in 8 and 9, digitized in A-D converter 10 and fed to a microcomputer 11.
  • the micro ⁇ computer processes the strain gauge signals and has output to energize warning indicators 12, 13, 14 as required. As evident from the drawing, these may show a numeric quantit indicate a directional warning by an illuminated arrow and sound an audible alarm.
  • This microcomputer may be of a type which is already used to produce axle load indication and overload warning,, and will not be described in detail.
  • the vehicle will be on the verge of falling over when the difference signal from left and right sensors stands in a certain ratio (the danger ratio) to the sum signal.
  • the difference between the actual ratio at any instant and the danger ratio is the safety margin.
  • the compliances of the suspension will allow a danger situation to occur which may not be correctable unless an appropriate manoeuvre is made. This tendency will be modified by the damping and nonlinearity of the suspension.
  • Advance warning can in principle be obtained by continuously calculating from the shift, rate of shift, and acceleration of shift of effective loading, the maximum shift that will occur in the absence of an appropriate manoeuvre. A warning will be issued if this maximum predicted shift exceeds the danger ratio.
  • the calculation will require as an extra input at least one parameter corresponding to the suspension compliances and damping for the particular load.
  • a range of such parameters may be available as constants on a look-up table and the appropriate one or ones could be manually keyed in; or they may be in memory and automatically accessed accordin.g to the load, which can be determined from the sum of the transducer outputs (see equation (5) ) .
  • the degree by which the warning of roll-over will precede the event will be a function of the vehicle suspension time constants.
  • the first graph (a) indicates that, at constant speed and radius, the sideways force F likewise remains constant over time C.
  • the second graph (b) indicates that the difference/ sum ratio R from the transducers will increase at a rate, and to an extent, dependent on the weight of the load, the suspension influencing the curves.
  • the rate and acceleration of load shift have characteristics as shown in the third and fourth graphs (c) and (d) , and the peaks of either or both character ⁇ istics, which are readily detectable in periods C and D some time before the ratio R approaches the danger level, can be used to calculate the final maximum ratio. Since the effect on suspension dynamic roll characteristics is substantially predictable from the total load (the sum of the sensor outputs) all the information required is available from the sensors. It will be understood that the transducers may be fitted to one or any number of axles, and that if two or more are so equipped, any one of the transducer pairs could give a warning, independently of the others.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Human Computer Interaction (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

Un système d'alarme de renversement pour des véhicules à roues possède des transducteurs de jauge de contrainte (6, 7) montés sur un essieu (3) symétrique par rapport au centre. Leurs signaux combinés peuvent indiquer la charge, et le degré de déplacement latéral effectif de la charge lorsque le véhicule négocie un virage. Ces indications peuvent être comparées à un maximum prédéterminé et une alarme est donnée lorsque le niveau de danger est approché. La vitesse et l'accélération du déplacement de la charge peuvent également être déterminées pour anticiper une telle approche. Des paramètres dépendant de la suspension compressible conventionnelle (1, 2) ainsi que la charge sont introduits dans le processus de calcul.
PCT/GB1984/000050 1983-02-22 1984-02-20 Systeme d'alarme de renversement Ceased WO1984003262A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU26519/84A AU2651984A (en) 1983-02-22 1984-02-20 A roll-over warning system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB838304884A GB8304884D0 (en) 1983-02-22 1983-02-22 Rollover warning system

Publications (1)

Publication Number Publication Date
WO1984003262A1 true WO1984003262A1 (fr) 1984-08-30

Family

ID=10538404

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1984/000050 Ceased WO1984003262A1 (fr) 1983-02-22 1984-02-20 Systeme d'alarme de renversement

Country Status (4)

Country Link
EP (1) EP0165924A1 (fr)
JP (1) JPS60500856A (fr)
GB (1) GB8304884D0 (fr)
WO (1) WO1984003262A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5825284A (en) * 1996-12-10 1998-10-20 Rollover Operations, Llc System and method for the detection of vehicle rollover conditions
GB2324871A (en) * 1997-04-30 1998-11-04 Nicholas James Handy Lateral stability indicator
US6185489B1 (en) 1998-06-12 2001-02-06 Roger Dean Strickler Vehicle overturn monitor
GB2385452A (en) * 2002-02-15 2003-08-20 Roland William Jones A safety system for vehicles
GB2426106A (en) * 2005-05-11 2006-11-15 Harborough Rail Systems Ltd Instability alarm for a vehicle with a load bearing arm
CN103770702A (zh) * 2014-01-26 2014-05-07 中国神华能源股份有限公司 一种车辆溜车检测装置和检测方法
GB2523185A (en) * 2014-02-18 2015-08-19 Caterpillar Sarl Method of determining whether a frame of a work machine is approaching a tip over point

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Coal Age, Vol. 86, December 1981, No. 12 (New York, US) N.P. CHIRONIS: "How to Prevent Loader Rollovers", pages 62-65, see figure 3 *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5825284A (en) * 1996-12-10 1998-10-20 Rollover Operations, Llc System and method for the detection of vehicle rollover conditions
GB2324871A (en) * 1997-04-30 1998-11-04 Nicholas James Handy Lateral stability indicator
GB2324871B (en) * 1997-04-30 1999-04-07 Nicholas James Handy Lateral stability indicator
US6185489B1 (en) 1998-06-12 2001-02-06 Roger Dean Strickler Vehicle overturn monitor
GB2385452A (en) * 2002-02-15 2003-08-20 Roland William Jones A safety system for vehicles
GB2426106A (en) * 2005-05-11 2006-11-15 Harborough Rail Systems Ltd Instability alarm for a vehicle with a load bearing arm
CN103770702A (zh) * 2014-01-26 2014-05-07 中国神华能源股份有限公司 一种车辆溜车检测装置和检测方法
GB2523185A (en) * 2014-02-18 2015-08-19 Caterpillar Sarl Method of determining whether a frame of a work machine is approaching a tip over point
WO2015124329A1 (fr) * 2014-02-18 2015-08-27 Caterpillar Sarl Procédé de détermination du fait que le châssis d'une machine de travail s'approche ou non d'un point de basculement
GB2523185B (en) * 2014-02-18 2017-03-08 Caterpillar Sarl Method of determining whether a frame of a work machine is approaching a tip over point
US9796392B2 (en) 2014-02-18 2017-10-24 Caterpillar Sarl Method of determining whether a frame of a work machine is approaching a tip over point

Also Published As

Publication number Publication date
EP0165924A1 (fr) 1986-01-02
JPS60500856A (ja) 1985-06-06
GB8304884D0 (en) 1983-03-23

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