GB2387582A - A vehicle air suspension system including trailer load measurement means - Google Patents

A vehicle air suspension system including trailer load measurement means Download PDF

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Publication number
GB2387582A
GB2387582A GB0307287A GB0307287A GB2387582A GB 2387582 A GB2387582 A GB 2387582A GB 0307287 A GB0307287 A GB 0307287A GB 0307287 A GB0307287 A GB 0307287A GB 2387582 A GB2387582 A GB 2387582A
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GB
United Kingdom
Prior art keywords
ride height
air
vehicle
load
trailer
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
GB0307287A
Other versions
GB0307287D0 (en
GB2387582B (en
Inventor
Jeremy John Greenwood
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.)
Ford Global Technologies LLC
Original Assignee
Ford Global Technologies LLC
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 Ford Global Technologies LLC filed Critical Ford Global Technologies LLC
Publication of GB0307287D0 publication Critical patent/GB0307287D0/en
Publication of GB2387582A publication Critical patent/GB2387582A/en
Application granted granted Critical
Publication of GB2387582B publication Critical patent/GB2387582B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
    • B60G17/016—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by their responsiveness, when the vehicle is travelling, to specific motion, a specific condition, or driver input
    • B60G17/0161—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by their responsiveness, when the vehicle is travelling, to specific motion, a specific condition, or driver input mainly during straight-line motion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60D—VEHICLE CONNECTIONS
    • B60D1/00—Traction couplings; Hitches; Draw-gear; Towing devices
    • B60D1/24—Traction couplings; Hitches; Draw-gear; Towing devices characterised by arrangements for particular functions
    • B60D1/247—Traction couplings; Hitches; Draw-gear; Towing devices characterised by arrangements for particular functions for improving weight distribution
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60D—VEHICLE CONNECTIONS
    • B60D1/00—Traction couplings; Hitches; Draw-gear; Towing devices
    • B60D1/58—Auxiliary devices
    • B60D1/62—Auxiliary devices involving supply lines, electric circuits, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/08—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for incorporation in vehicles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G5/00—Weighing apparatus wherein the balancing is effected by fluid action
    • G01G5/006—Weighing apparatus wherein the balancing is effected by fluid action with pneumatic means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2300/00—Indexing codes relating to the type of vehicle
    • B60G2300/04—Trailers
    • B60G2300/042—Semi-trailers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/25—Stroke; Height; Displacement
    • B60G2400/252—Stroke; Height; Displacement vertical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/50—Pressure
    • B60G2400/51—Pressure in suspension unit
    • B60G2400/512—Pressure in suspension unit in spring
    • B60G2400/5122—Fluid spring
    • B60G2400/51222—Pneumatic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/60—Load
    • B60G2400/61—Load distribution
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/20—Spring action or springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
    • B60G2800/01—Attitude or posture control
    • B60G2800/014—Pitch; Nose dive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
    • B60G2800/01—Attitude or posture control
    • B60G2800/019—Inclination due to load distribution or road gradient
    • B60G2800/0192—Inclination due to load distribution or road gradient longitudinal with regard to vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
    • B60G2800/16—Running
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
    • B60G2800/90—System Controller type
    • B60G2800/91—Suspension Control
    • B60G2800/912—Attitude Control; levelling control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
    • B60G2800/90—System Controller type
    • B60G2800/91—Suspension Control
    • B60G2800/914—Height Control System

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transportation (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

A vehicle air suspension system comprises a control unit 24 which controls the flow of air to and from the air springs 16, 18 via a valve block 22. Pressure sensors 28 and ride height sensors 30 enable the control unit 24 to measure the air pressure in the air springs 16, 18 and the ride height at each of the wheels. A remote control unit 34 controls the suspension system to raise the vehicle to bring the vehicle's tow ball 42 into contact with a tow bar 44 of a trailer 46. A step change in the air pressure at the point of contact is used to measure the trailer nose load which is transmitted to the remote control unit 34 which displays it to the driver.

Description

TRAILER LOAD MEASUREMENT
The present invention relates to the measurement of the loads exerted by a trailer on a towing vehicle.
s The stability of a trailer when being towed by a towing vehicle is affected by a number of factors, one of which is the vertical load exerted on the tow ball or other towing attachment by the front end of the trailer. This load is referred to as the trailer nose weight. It is therefore desirable that the driver 10 of a towing vehicle can determine the nose weight of a trailer that the vehicle is towing.
The present invention comprises apparatus for measuring a load exerted by a trailer on a towing vehicle fitted with air springs, the Apparatus including; 15 means for monitoring air pressure in at least one of said air springs, means for varying a ride height of the towing vehicle, . means for monitoring the ride height of the towing vehicle, and means for detecting a step change in the relationship between monitored air pressure and monitored ride height as the ride height is 20 varied, thereby to measure said load.
In one embodiment, the means for monitoring air pressure is adapted to monitor air pressure only in an air spring fitted at the rear of the towing vehicle. Optionally, the apparatus may be configured to apply a correction to the 25 measured load dependent upon rotation of the towing vehicle about a trailer attachment point.
The ride height monitoring means may comprise one or more ride height sensors arranged to measure vertical travel of the vehicle body relative to
the vehicle wheels. However any suitable means of measuring vertical movement of the towing attachment could be used.
Preferably the apparatus further comprises display means arranged to indicate said load to a user.
5 A user operable activation unit may be provided in order to communicate with the means for varying the ride height..
The apparatus may further comprise warning means arranged to provide a warning if the load exceeds a predetermined value.
Preferred embodiments of the present invention will now be described by 10 way of example only with reference to the accompanying drawings in which: Figure 1 is a schematic view of a vehicle including a suspension system according to the invention; Figure 2 is a graph showing the relationship between air spring pressure and ride height in an ideal suspension system; and Figures 3 and 4 are graphs showing variations in air spring pressure and 20 ride height in the system of Figure 1.
_ Referring to Figure 1 a vehicle comprises two front wheels 10 and two rear wheels 12 and a body 14. The wheels 10, 12 and the hubs on which they are mounted, which comprise unsprung parts of the vehicle, are connected to 25 the body by means of a suspension system which includes front air springs 16 for the front wheels and rear air springs 18 for the rear wheels. The body 14 and any parts of the vehicle that moves with it therefore form the sprung parts of the vehicle.
The suspension system further comprises a compressor 20 and a valve block 22 which includes valves which control the flow of air from the compressor to the air springs 16, 18 and from the air springs to atmosphere.
An electronic control unit 24 controls the operation of the valve block 22 5 so as to control the volume and pressure of the air in each of the air springs 16, 18, thereby controlling the height of the body 14 relative to the wheels 10, 12 and the surface 26 on which the vehicle is standing or travelling.
An air pressure sensor 28 and a ride height sensor 30 on each of the air 10 springs 16, 18 provide signals to the control unit 24 enabling it to measure the air pressure in each of the air springs and the ride height of the body 14 relative to each of the wheels 10, 12.
The control unit 24 controls a number of functions of the air- suspension 15 system, including the vehicle ride height, which can be considered as an average of the ride heights at each of the four wheels 10, 12. A driver input 32 is provided within the vehicle and connected to the control unit 24 to enable the driver to select one of a plurality of ride heights for the vehicle, depending on the conditions in which he expects to be driving. A remote 20 control unit 34 is also provided which can communicate remotely with the control unit 24 by means of a communications link 36 which in this embodiment is a two way radio link. The remote control unit 34 has a user input in the form of a number of buttons 38 enabling a user to input commands which can then be transmitted to the control unit 24, and a 25 display 40 which can display information relating to the operation of the air suspension system to the user.
A towing attachment, in the form of a tow ball 42 is attached to the rear of the vehicle body 14 and is arranged for attachment to the tow bar 44 of a 30 trailer 46, the tow bar 44 having a socket 48 which is arranged to fit over the top of the tow ball 42. The trailer also comprises a jockey wheel 50 on
the tow bar 44 which can support the front end of the trailer 46 when it is not supported on the tow ball 42.
In order to aid in hitching up the trailer 46 to the vehicle, the remote S control unit 34 is arranged to allow a user to input commands to increase and decrease the vehicle ride height to raise and lower the vehicle body 14, and hence the tow ball 42. This enables the user to lower the ride height to its lowest level, move the trailer 46 so that the socket 48 is positioned - above the tow ball 42 with the front of the trailer supported on the jockey 10 wheel 50, and then raise the vehicle body and tow ball 42 so that the tow ball comes into contact with the socket and then lifts the front end of the trailer 46, lifting the jockey wheel 50 off the ground 26. During this operation the control unit 24 is arranged to measure the change in the vertical load, or nose weight, exerted by the front end of the trailer 46 on 15 the tow ball 42- as will be described below.
Referring to Figure 2, in an ideal air suspension system in which the air springs support the entire weight of the vehicle, the air pressure P in the air springs will remain constant if air is pumped into them or released from 20 them. Only the volume of the air in the springs will change as the vertical displacement D of the body, i.e. the ride height, changes. Changes in ride height can therefore be represented as a flat line characteristic as shown in Figure 2.
25 In a typical air suspension system, as the volume of air in the springs is changed to change the ride height D, the pressure also changes. This is as a result of the suspension geometry which may vary the air pressure required to support the vehicle as the ride height changes, and also due to dynamically generated changes in load, and stiction effects which will be 30 particularly pronounced if the suspension geometry is such that a change in ride height results in a change in track width, as is the case with most -
independent suspensions. The result of these effects is that the pressure P changes with ride height D in an irregular manner as shown in Figure 3.
When the suspension is used to lift the front end of the trailer 46 as 5 described above, there will be a certain ride height Do at which the tow ball 42 comes into contact with the tow bar socket 48. At this point the ride height will remain substantially constant while the air pressure increases to - a level sufficient to support the additional load, which is the nose weight of the trailer 46, applied to the tow ball-42. Then when the air pressure has 10 increased sufficiently the ride height will again-start to increase as the front end of the trailer 46 is lifted so that the jockey wheel 50 is lifted clear of the ground 26. The result of this is that the air pressure will vary with ride height as shown in Figure 4. As can be seen from Figure 4 the pressure varies with ride height in an irregular manner similar to that of Figure 3, 15 but, at the ride height D, where the tow ball comes into contact with the trailer socket 48, there is a step change x in the air pressure P with substantially no change in ride height.
The control unit 24 is arranged, in response to a command from the remote 20 control unit 34 to raise the vehicle, to control the flow if air into the air springs 16, 18 to increase the ride height and, as the air is being pumped into the air springs, to monitor the changes in air pressure P and ride height D. The control unit 24 then analyses the signals from the sensors 28, 30 to detect the occurrence of a step change in pressure, and, if such a step 25 change is detected, to measure its height. From this measurement the nose weight of the trailer can be determined. The control unit 24 then transmits a signal to the remote control unit 34 indicating the measured nose weight, which is displayed to the user on the display 40.
30 It will be appreciated that when the tow ball contacts the tow bar socket it will be possible for the ride height at the wheels to change slightly without any change in height of the tow ball 42, as the vehicle rotates about the tow
ball 42 with the front rising more rapidly than the rear. Therefore the algorithm for detecting the step change in air pressure will need to take this into account.
5 In some cases, rather than using the air pressure in all of the air springs to measure the nose weight, it is preferable to use only the rear springs 18. In particular if the suspension includes a levelling system it may be arranged to increase the air pressure in the rear springs more than in the front springs to counteract the effect of the trailer which will tend to hold down the rear -10 of the vehicle more than the front. Therefore in a modification to the system described above the changes in air pressure in the rear air springs i 8 only is measured and used to determine the trailer nose weight.
Similarly because the ride height of the front wheels 10 can vary with very little effect on the height of the tow ball 42, in a further modification the 15 ride height of only the rear wheels 12 is monitored as the ride height increases and used to determine the point at which the tow ball has come into contact with the trailer socket 48. -
In a further embodiment, rather than indicating to the user the trailer nose 20 weight, the control unit is arranged to detect a nose weight greater than a predetermined value, which might for example - be the maximum nose weight which the vehicle can safely tow. If this limiting nose weight is exceeded then the driver is warned, either via the remote control unit or via some form of alarm or indicator on the vehicle.

Claims (10)

- --1 CLAIMS
1. Apparatus for measuring a load exerted by a trailer on a towing vehicle fitted with air springs, the apparatus including; 5 means for monitoring air pressure in at least one of said air springs, means for varying a ride height of the towing vehicle, means for monitoring the ride height of the towing vehicle, and means for detecting a step change in the relationship between monitored air pressure and monitored ride height as the ride height is 10 varied, thereby to measure said load.
2. Apparatus according to claim I in which the means for monitoring air pressure is adapted to monitor air pressure only in an air spring fitted at the rear of the towing vehicle.
3. Apparatus according to either foregoing claim in which the device is 15 configured to apply a correction to the measured load dependent upon rotation of the towing vehicle about a trailer attachment-point.
4. Apparatus according to any foregoing claim further comprising display means arranged to indicate said load to a user.
5. Apparatus according to any foregoing claim further comprising a 20 user-operable activation unit arranged to communicate with the means for varying the ride height.
6. Apparatus according to claim 5 wherein the activation unit is operable from positions remote from the vehicle.
7. Apparatus according to claim 5 or claim 6 when dependent on claim 25 4 wherein the display means forms part of the activation unit.
8. Apparatus according to any foregoing claim further comprising warning means arranged to provide a warning if the load exceeds a predetermined value.
9. Apparatus for measuring a load substantially as hereinbefore 5 described with reference to Figures 1, 3 and 4 of the accompanying drawings.
10. A vehicle including the apparatus according to any foregoing claim.
A method for measuring a load exerted by a trailer on a towing vehicle fitted with air springs, the method including the steps of; 10 monitoring air pressure in at least one of said air springs, varying a ride height of the towing vehicle, monitoring the ride height of the towing vehicle, and detecting a step change in the relationship between.m.onitored air pressure and monitored ride height as the ride height is varied, thereby 15 to measure said load. - -
GB0307287A 2002-04-12 2003-03-31 Trailer load measurement Expired - Lifetime GB2387582B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB0208450.7A GB0208450D0 (en) 2002-04-12 2002-04-12 Trailer load measurement

Publications (3)

Publication Number Publication Date
GB0307287D0 GB0307287D0 (en) 2003-05-07
GB2387582A true GB2387582A (en) 2003-10-22
GB2387582B GB2387582B (en) 2005-04-06

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GBGB0208450.7A Ceased GB0208450D0 (en) 2002-04-12 2002-04-12 Trailer load measurement
GB0307287A Expired - Lifetime GB2387582B (en) 2002-04-12 2003-03-31 Trailer load measurement

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005073001A1 (en) * 2004-01-30 2005-08-11 Curtiss-Wright Antriebstechnik Gmbh Hydropneumatic spring device and method for controlling the same
WO2005080100A1 (en) * 2004-02-24 2005-09-01 Bayerische Motoren Werke Aktiengesellschaft Method for coupling a trailer using a vehicle level regulator
US8840129B2 (en) 2012-07-31 2014-09-23 Clark Equipment Company Mechanism for automatically lifting a trailer drawbar support
EP2052889B1 (en) 2007-10-26 2016-06-15 Strömsholmen AB Hydropneumatic spring-damping device and method of operation of a hydropneumatic spring-damping device
GB2546806A (en) * 2016-02-01 2017-08-02 Jaguar Land Rover Ltd Vehicle air suspension switch
DE102006049541B4 (en) * 2006-10-20 2018-10-31 Volkswagen Ag Method and device for determining a trailer support load
GB2571780A (en) * 2018-03-09 2019-09-11 Ford Global Tech Llc Trailer detection system for a vehicle
LU101495B1 (en) * 2019-11-25 2021-05-26 Hellgeth Eng Spezialfahrzeugbau Gmbh Device and method for soil pressure distribution
WO2022159974A1 (en) * 2021-01-22 2022-07-28 Continental Automotive Systems, Inc. High accuracy vehicle load calculation
US11827232B2 (en) 2021-01-22 2023-11-28 Continental Automotive Systems, Inc. High accuracy vehicle load management

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6431557B1 (en) * 1997-01-24 2002-08-13 Volvo Lastvagnar Ab Driving mode ride height adjustment

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6431557B1 (en) * 1997-01-24 2002-08-13 Volvo Lastvagnar Ab Driving mode ride height adjustment

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005073001A1 (en) * 2004-01-30 2005-08-11 Curtiss-Wright Antriebstechnik Gmbh Hydropneumatic spring device and method for controlling the same
WO2005080100A1 (en) * 2004-02-24 2005-09-01 Bayerische Motoren Werke Aktiengesellschaft Method for coupling a trailer using a vehicle level regulator
US7429051B2 (en) 2004-02-24 2008-09-30 Bayerische Motoren Werke Aktiengesellschaft Process for coupling a trailer with the use of a vehicle level regulation system
CN100513213C (en) * 2004-02-24 2009-07-15 宝马股份公司 Method for coupling a trailer using a vehicle level regulator
DE102006049541B4 (en) * 2006-10-20 2018-10-31 Volkswagen Ag Method and device for determining a trailer support load
EP2052889B1 (en) 2007-10-26 2016-06-15 Strömsholmen AB Hydropneumatic spring-damping device and method of operation of a hydropneumatic spring-damping device
US8840129B2 (en) 2012-07-31 2014-09-23 Clark Equipment Company Mechanism for automatically lifting a trailer drawbar support
GB2546806B (en) * 2016-02-01 2018-11-07 Jaguar Land Rover Ltd Vehicle air suspension switch
GB2546806A (en) * 2016-02-01 2017-08-02 Jaguar Land Rover Ltd Vehicle air suspension switch
US10730361B2 (en) 2016-02-01 2020-08-04 Jaguar Land Rover Limited Vehicle air suspension switch
GB2571780A (en) * 2018-03-09 2019-09-11 Ford Global Tech Llc Trailer detection system for a vehicle
GB2571780B (en) * 2018-03-09 2020-04-01 Ford Global Tech Llc Trailer detection system for a vehicle
LU101495B1 (en) * 2019-11-25 2021-05-26 Hellgeth Eng Spezialfahrzeugbau Gmbh Device and method for soil pressure distribution
EP3825155A1 (en) * 2019-11-25 2021-05-26 Hellgeth engineering Spezialfahrzeugbau GmbH Device and method for floor pressure distribution
WO2022159974A1 (en) * 2021-01-22 2022-07-28 Continental Automotive Systems, Inc. High accuracy vehicle load calculation
US11827232B2 (en) 2021-01-22 2023-11-28 Continental Automotive Systems, Inc. High accuracy vehicle load management

Also Published As

Publication number Publication date
GB0307287D0 (en) 2003-05-07
GB0208450D0 (en) 2002-05-22
GB2387582B (en) 2005-04-06

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Date Code Title Description
746 Register noted 'licences of right' (sect. 46/1977)

Effective date: 20090304

PE20 Patent expired after termination of 20 years

Expiry date: 20230330