GB2344323A - Pneumatic adjustable vehicle suspension - Google Patents

Pneumatic adjustable vehicle suspension Download PDF

Info

Publication number
GB2344323A
GB2344323A GB9928229A GB9928229A GB2344323A GB 2344323 A GB2344323 A GB 2344323A GB 9928229 A GB9928229 A GB 9928229A GB 9928229 A GB9928229 A GB 9928229A GB 2344323 A GB2344323 A GB 2344323A
Authority
GB
United Kingdom
Prior art keywords
vehicle
gas
pressure
tyre
control means
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
GB9928229A
Other versions
GB9928229D0 (en
GB2344323B (en
Inventor
Richard Graham Woodhouse
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.)
MG Rover Group Ltd
Original Assignee
MG Rover Group 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 MG Rover Group Ltd filed Critical MG Rover Group Ltd
Priority to GB0213250A priority Critical patent/GB2373224B/en
Priority to GB0213172A priority patent/GB2373223B/en
Publication of GB9928229D0 publication Critical patent/GB9928229D0/en
Publication of GB2344323A publication Critical patent/GB2344323A/en
Application granted granted Critical
Publication of GB2344323B publication Critical patent/GB2344323B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • B60G17/019—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 the type of sensor or the arrangement thereof
    • 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
    • B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
    • B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
    • B60G17/052—Pneumatic spring characteristics
    • B60G17/0523—Regulating distributors or valves for pneumatic springs
    • 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
    • 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
    • B60G2400/52—Pressure in tyre
    • 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
    • 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
    • B60G2500/201—Air spring system type
    • B60G2500/2012—Open systems
    • 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
    • B60G2500/205—Air-compressor operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/30—Height or ground clearance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2600/00—Indexing codes relating to particular elements, systems or processes used on suspension systems or suspension control systems
    • B60G2600/08—Failure or malfunction detecting means

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

A vehicle air suspension system comprises gas springs 22, 24, 26 and 28 associated with each of the vehicle's wheels 48, a reservoir 38, a compressor 12 and a single pressure sensor 42, all connected to a main line 18 of a pneumatic circuit by respective valves 30, 32, 34, 36 and 40. The valves are controlled so as to connect the pressure sensor to various parts of the system to measure the pressure there and the measured pressures are used for various functions such as monitoring the weight of the vehicle, fault diagnosis and varying the ride height.

Description

Vehicle Suspensions The present invention relates to air suspension systems for vehicles.
It is known, for example from DE 19603593, to measure the pressure at various points in a vehicle air suspension system using a single sensor. It is an aim of the present invention to provide an improved vehicle air suspension using information from such a sensors and from other types of sensors.
The present invention provides a suspension system for connecting a plurality of vehicle wheels to a vehicle body, the system comprising a pneumatic circuit including a source of pressurized gas, gas springs for supporting the vehicle body, each of which is associated with one of the wheels, a gas pressure reservoir, a pressure sensor for measuring gas pressure, and a plurality of valves, and control means arranged to determine a condition in which one of the gas springs needs to be inflated wherein, in response to detection of such a condition, the control means is arranged to compare the pressures of said one of the gas springs and the reservoir and, if the pressure of the gas spring is higher than that of the reservoir, to connect the gas spring to the pressure source and disconnect both the pressure source and the gas spring from the reservoir thereby to inflate the gas spring directly from the source.
The present invention further provides a suspension system for connecting a plurality of vehicle wheels to a vehicle body, the system comprising a pneumatic circuit including a source of pressurized gas, gas springs for supporting the vehicle body, an inlet valve which can connect the gas springs to the source of pressurized gas to increase the ride height of the vehicle, an exhaust valve which can release gas from the gas springs to decrease the ride height of the vehicle and control means arranged to control the valves and to respond to a request for an increase in ride height by checking the operation of the exhaust valve and only increasing the ride height if the exhaust valve is operable to release gas from the springs.
Preferably the control means is arranged to check the operation of the exhaust valve by sending a signal to open the exhaust valve and subsequently monitoring the pressure in part of the system connected to the exhaust valve to check that it decreases at at least a predetermined rate.
The present invention further provides apparatus for measuring the ride height at a wheel of a vehicle, the wheel having a hub and a tyre, the apparatus comprising height measuring means for measuring the distance between the wheel hub and a sprung part of the vehicle, load measuring means for measuring the load on the wheel and control means arranged to produce a measure of the distance between the sprung part of the vehicle and a surface on which the wheel is resting using the measured distance and an estimate of the degree of compression of the tyre produced by the load.
Preferably the apparatus further comprises pressure sensing means arranged to measure the air pressure in the tyre, and the control means is arranged to use the measured air pressure in estimating the degree of compression of the tyre.
Preferred embodiments of the present invention will now be described by way of example only with reference to the accompanying Figure 1 which is a diagrammatic representation of a suspension system according to the invention.
A vehicle air suspension system comprises a pneumatic circuit 10 comprising an electric compressor 12 supplying air under pressure via a non-return valve 14 and an air dryer 16 to a main pneumatic line 18. An exhaust valve 20 is provided which can be opened to exhaust the line 18 to atmosphere. Four gas springs 22,24, 26,28 are each connected to the line 18 by respective spring valves 30,32,34,36 which can each be opened to connect the respective spring to the line 18 or closed to isolate the respective spring. An air pressure reservoir 38 is also connected to the line 18 by a reservoir valve 40 which can also be opened to connect the reservoir to the line 18 or closed to isolate the reservoir. Finally a pressure sensor 42 is connected to line 18 to measure the pressure in it. A suspension control unit 44 controls all of the valves 20,30,32,34,36,40 and the compressor 12 to control the ride height of each of the wheels in response to signals from the pressure sensor. The control unit 44 also receives signals from ride height sensors 46 each associated with one of the wheels 48 which produce signals indicative of the distance between an unsprung part of the suspension which moves vertically with the wheel hub 50, such as the steering knuckle in the front wheels, or part of a beam axle close to the respective wheel, and a sprung part of the vehicle, such as part of the body 52. It may also receive signals from one or more accelerometers indicating acceleration of the vehicle body in the longitudinal, lateral and vertical directions.
At regular intervals when it will not interfere with the normal control of the suspension system, the control unit 44 is arranged to close the exhaust valve 20 and all but one of the other valves 30,32,34,36,40 so as to connect the pressure sensor to one of the gas springs 22,24,26,28 or the reservoir 38, and to record the pressure measured by the sensor 42. This enables the control unit to measure the pressures in each of the gas springs and the reservoir 38. This measurement of the various gas pressures can then be used in various ways as will be described below.
In order to determine the total sprung weight of the vehicle, including its load, the control unit measures the pressures of each of the gas springs 22,24,26, 28. These pressures each give a measurement of the load on the gas springs, and the loads can be added together to give a measurement of the total weight of the vehicle, or simply of the load carried by the vehicle. The conversion of pressures to loads will generally depend on a number of factors, including in particular the effective cross sectional area of the gas spring piston. This cross sectional area is often arranged so as to vary with the ride height of the vehicle, and is therefore variable but known. The loads can therefore conveniently be determined using look-up tables. This weight can either be displayed continuously to the driver by means of, for example, an LED display in the driver's compartment. Alternatively, or in addition, it can be used to trigger an alarm, such as a flashing light or buzzer, if the total vehicle weight exceeds a predetermined maximum, indicating overloading. Where the vehicle includes an on-board system for controlling the level of inflation of its tyres, the vehicle weight can be input to a tyre inflation control system which then controls tyre inflation in response to the measured weight of the vehicle. Finally the vehicle weight can be used to modify a roll control function in the vehicle suspension. For example where the roll control system measures lateral acceleration of the vehicle and produces a roll correction force which is calculated, for example, so as to keep the vehicle level, the vehicle weight will affect the relationship between the lateral acceleration and the force required to keep the vehicle level. If the weight is measured as described above this can be input to the roll control system which can respond accordingly. This will apply whether the roll correction force is provided by controlling the inflation of the gas springs in the system shown in Figure 1, or by an active anti-roll bar.
The individual wheel loads can also be used to refine the operation of the active suspension system. This is because the ride height sensors 46 measure the distance h from the wheel hubs 50, to part of the vehicle body 52, whereas the measurement actually required by the system to operate optimally is that of the distance (h+h') between the body 52 and the ground, which will also be affected by the level of tyre squash. The distance h'between the hub 50 and the ground is dependent on the tyre pressures and the load on the wheel. The control unit 44 therefore uses the measured wheel loads, and tyre pressure measurement from a tyre pressure sensor 54, to modify the measured ride heights to take tyre squash into account. This enables, for example, the vehicle levelling function of the system to operate more accurately. Since the height h'will also depend on the type of tyre on the wheel 48, which could obviously be changed by the driver, the control unit 44 is also programmable to account for changes in tyre type. Alternatively the tyre pressure sensor, which can be of the type embedded in the tyre, can also be arranged to transmit to the control unit 44 further information to enable more accurate determination of the distance h'between hub and ground, for example the tyre type and temperature. Such sensors are disclosed, for example in W096/28311.
A further feature of the control of the system is that, because the pressure in the reservoir 38 and the gas springs 22,24,26,28 is continuously monitored, the inflation of the gas springs can be controlled to avoid accidental deflation. When the control unit 44 determines that one of the gas springs needs to be inflated, it checks the pressure of that spring and the reservoir. If the reservoir pressure is higher it opens the reservoir valve 40 and the valve of the relevant gas spring to connect the gas spring to the reservoir to inflate the gas spring. If, on the other hand the reservoir pressure is lower than the spring pressure, the reservoir valve 40 is closed to cut off the reservoir from both the gas spring and the compressor 12, and the gas spring valve is opened to connect the gas spring to the compressor so that it can be inflated directly from the compressor. This ensures that all the air from the compressor is fed directly to the gas spring to inflate it quickly thereby minimizing vehicle lifting times. It also means that there is no need for a nonreturn valve to prevent accidental deflation of the gas spring. Furthermore it ensures that the pressure reservoir 38 can be used whenever its pressure is higher than that of the gas spring which is to be inflated.
The control unit 44 is also arranged to monitor the system continuously for faults, particularly in the valves. It does this by sending a signal to one of the valves to open or close it and then monitoring the gas pressure in part or the system to determine whether the expected pressure changes result. For example, to check the operation of one of the spring valves 22,24,26,28 the control unit sends a signal to open it, thereby connecting the pressure sensor to the gas spring, and then checks that the oscillations in gas pressure expected from the motion of the wheel associated with that spring over a surface are detected. If they are not a warning can be given to the driver or a fault stored in memory for interrogation using service diagnostics equipment. Similarly to check the operation of the exhaust valve, the main line 18 and drier 16 can be connected briefly to the reservoir 38 to increase their pressure, then a signal then sent to open the exhaust valve and the subsequent decay of pressure monitored. If the pressure does not decay as quickly as expected this indicates that the exhaust valve is stuck closed.
A stuck closed reservoir valve would be indicated by too rapid an increase in pressure when running the compressor to charge the reservoir while the reservoir valve is signalled to be open. A stuck open reservoir valve would be indicated by a failure of the pressure in the main line 18 to drop rapidly when the exhaust valve 20 is open and the reservoir valve 40 signalled to be closed. Finally a slow increase of pressure when charging the reservoir may be indicative of a faulty compressor or a leak in the air supply.
Checking the operation of the exhaust valve is particularly important where the control unit 44 is arranged to allow the ride height of the vehicle to be varied.
In off road vehicles it is known to have a choice of ride heights so that for off-road driving the ride height can be increased to give greater wheel travel, and for on road driving the ride height can be decreased again to reduce wind resistance and improve handling particularly through corners. The control unit 44 is then arranged to respond to a request for an increase in ride height by first checking the operation of the exhaust valve 20 as described above to ensure that it can release air from the system. Only of the exhaust valve is operating properly is the ride height increased. If it is not, the request for an increased ride height is overridden. This helps to ensure that the vehicle ride height is not increased to a level above that which is optimum for on-road driving if it will not be possible to reduce it again afterwards. It will be appreciated that this check could in fact be made under the same conditions using a different means for checking the proper operation of the exhaust valve. However, methods which check for the exhaust of air from the system, rather than simply the opening of the valve, are preferable because the latter would not detect other problems such as a blocked pipe.

Claims (7)

  1. CLAIMS 1. A suspension system for connecting a plurality of vehicle wheels to a vehicle body, the system comprising a pneumatic circuit including a source of pressurized gas, gas springs for supporting the vehicle body, each of which is associated with one of the wheels, a gas pressure reservoir, a pressure sensor for measuring gas pressure, and a plurality of valves, and control means arranged to determine a condition in which one of the gas springs needs to be inflated characterized in that, in response to detection of such a condition, the control means is arranged to compare the pressures of said one of the gas springs and the reservoir and, if the pressure of the gas spring is higher than that of the reservoir, to connect the gas spring to the pressure source and disconnect both the pressure source and the gas spring from the reservoir thereby to inflate the gas spring directly from the source.
  2. 2. A suspension system for connecting a plurality of vehicle wheels to a vehicle body, the system comprising a pneumatic circuit including a source of pressurized gas, gas springs for supporting the vehicle body, an inlet valve which can connect the gas springs to the source of pressurized gas to increase the ride height of the vehicle, an exhaust valve which can release gas from the gas springs to decrease the ride height of the vehicle and control means arranged to control the valves, characterized in that the control means is arranged to respond to a request for an increase in ride height by checking the operation of the exhaust valve and only increasing the ride height if the exhaust valve is operable to release gas from the springs.
  3. 3. A system according to claim 1 characterized in that the control means is arranged to check the operation of the exhaust valve by sending a signal to open the exhaust valve and subsequently monitoring the pressure in part of the system connected to the exhaust valve to check that it decreases at at least a predetermined rate.
  4. 4. Apparatus for measuring the ride height at a wheel of a vehicle, the wheel having a hub and a tyre, the apparatus comprising height measuring means for measuring the distance between the wheel hub and a sprung part of the vehicle, load measuring means for measuring the load on the wheel and control means characterized in that the control means is arranged to produce a measure of the distance between the sprung part of the vehicle and a surface on which the wheel is resting using the measured distance and an estimate of the degree of compression of the tyre produced by the load.
  5. 5. Apparatus according to claim 4 further comprising pressure sensing means arranged to measure the air pressure in the tyre, characterized in that the control means is arranged to use the measured air pressure in estimating the degree of compression of the tyre.
  6. 6. Apparatus according to claim 5 or claim 6 including tyre type identification means characterized in that the control means is arranged to use information on the type of tyre in estimating the degree of compression of the tyre.
  7. 7. A vehicle suspension system substantially as hereinbefore described with reference to the accompanying drawings.
GB9928229A 1998-12-04 1999-12-01 Vehicle suspensions Expired - Fee Related GB2344323B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0213250A GB2373224B (en) 1998-12-04 1999-12-01 Vehicle suspensions
GB0213172A GB2373223B (en) 1998-12-04 1999-12-01 Vehicle suspensions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB9826643.0A GB9826643D0 (en) 1998-12-04 1998-12-04 Vehicle suspensions

Publications (3)

Publication Number Publication Date
GB9928229D0 GB9928229D0 (en) 2000-01-26
GB2344323A true GB2344323A (en) 2000-06-07
GB2344323B GB2344323B (en) 2002-08-14

Family

ID=10843619

Family Applications (2)

Application Number Title Priority Date Filing Date
GBGB9826643.0A Ceased GB9826643D0 (en) 1998-12-04 1998-12-04 Vehicle suspensions
GB9928229A Expired - Fee Related GB2344323B (en) 1998-12-04 1999-12-01 Vehicle suspensions

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GBGB9826643.0A Ceased GB9826643D0 (en) 1998-12-04 1998-12-04 Vehicle suspensions

Country Status (1)

Country Link
GB (2) GB9826643D0 (en)

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1002676A3 (en) * 1998-11-18 2000-11-29 DaimlerChrysler AG Method for height control and wheeled vehicle with a height control system
EP1190926A2 (en) 2000-09-26 2002-03-27 DaimlerChrysler Rail Systems GmbH Control of the pneumatic suspension and pneumatic suspension for a railway vehicle
EP1123822A3 (en) * 2000-02-11 2004-04-21 Continental Aktiengesellschaft Method of replenishing a pressure medium chamber of a level control equipment from a pressure medium accumulator
EP1321320A3 (en) * 2001-12-21 2004-11-03 KNORR-BREMSE SYSTEME FÜR NUTZFAHRZEUGE GmbH Air spring installation and device for sensing pressures
EP1484204A2 (en) * 2003-06-04 2004-12-08 Isuzu Motors Limited Vehicle height adjustment system
WO2005123426A1 (en) * 2004-06-17 2005-12-29 Daimlerchrysler Ag Tire protection system
EP1342596A3 (en) * 2002-03-08 2006-07-05 Continental Aktiengesellschaft Air leakage detection in a height control device using pneumatic springs
EP1680290A1 (en) * 2003-10-17 2006-07-19 Active Air Suspension Limited Vehicle suspension control
WO2007022989A1 (en) 2005-08-26 2007-03-01 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Method and device for detecting malfunctions in the running gear of vehicles with pneumatic suspensions
WO2007033754A1 (en) * 2005-09-20 2007-03-29 Continental Aktiengesellschaft Level control system for a vehicle, and method for the operation thereof
WO2008031650A1 (en) 2006-09-16 2008-03-20 Continental Aktiengesellschaft Method for controlling and/or regulating the level of a vehicle body of a motor vehicle
EP1970229A1 (en) * 2007-03-14 2008-09-17 ArvinMeritor Technology, LLC Control unit for suspension using single pressure sensor
WO2010054917A1 (en) * 2008-11-11 2010-05-20 Continental Aktiengesellschaft Method for the functional testing of a valve
WO2011160735A1 (en) * 2010-06-24 2011-12-29 Wabco Gmbh Air supply device for a vehicle having pneumatic devices
DE102010032046A1 (en) 2010-07-23 2012-01-26 Volkswagen Ag Method for controlling load of air-springy motor car, involves adjusting pressure of pneumatic springs, and providing target parameter with height-dependent target component that is determined depending on pivotal point of motor car
CN103527462A (en) * 2012-07-04 2014-01-22 现代摩比斯株式会社 Method for detecting error of air compressor
CN105059075A (en) * 2015-09-17 2015-11-18 上海海事大学 Two-stage regulating system and method of height of car body
US11685220B2 (en) 2021-10-12 2023-06-27 DRiV Automotive Inc. Control systems and methods for suspension systems
US11691474B2 (en) 2021-10-12 2023-07-04 DRiV Automotive Inc. Suspension system tank filling systems and methods
US11697319B2 (en) 2021-10-12 2023-07-11 DRiV Automotive Inc. Suspension system with comfort valve integration
US11865889B2 (en) 2021-10-12 2024-01-09 DRiV Automotive Inc. Suspension system with comfort valves between cross-over hydraulic circuits
US11865887B2 (en) 2021-10-12 2024-01-09 DRiV Automotive Inc. Suspension system with incremental roll and pitch stiffness control
US11904841B2 (en) 2021-10-12 2024-02-20 DRiV Automotive Inc. Suspension system integration with advanced driver assistance system
US11912092B2 (en) 2021-10-12 2024-02-27 DRiV Automotive Inc. Suspension leak check systems and methods
US11919355B2 (en) 2021-10-12 2024-03-05 DRiV Automotive Inc. Valve diagnostic systems and methods
US11938772B2 (en) 2021-10-12 2024-03-26 DRiV Automotive Inc. System for grading filling of a hydraulic suspension system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4390187A (en) * 1980-01-18 1983-06-28 Tokico Ltd. Vehicle leveling system
GB2331494A (en) * 1997-11-19 1999-05-26 Btr Industries Ltd Vehicle suspension gas supply system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19801665C2 (en) * 1998-01-17 2000-04-20 Daimler Chrysler Ag Method for detecting malfunctions in a compressed air system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4390187A (en) * 1980-01-18 1983-06-28 Tokico Ltd. Vehicle leveling system
GB2331494A (en) * 1997-11-19 1999-05-26 Btr Industries Ltd Vehicle suspension gas supply system

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1002676A3 (en) * 1998-11-18 2000-11-29 DaimlerChrysler AG Method for height control and wheeled vehicle with a height control system
US6293562B1 (en) 1998-11-18 2001-09-25 Daimlerchrysler Ag Method and apparatus for controlling ride height of a wheeled vehicle
EP1123822A3 (en) * 2000-02-11 2004-04-21 Continental Aktiengesellschaft Method of replenishing a pressure medium chamber of a level control equipment from a pressure medium accumulator
EP1190926A2 (en) 2000-09-26 2002-03-27 DaimlerChrysler Rail Systems GmbH Control of the pneumatic suspension and pneumatic suspension for a railway vehicle
EP1190926A3 (en) * 2000-09-26 2002-11-13 DaimlerChrysler Rail Systems GmbH Control of the pneumatic suspension and pneumatic suspension for a railway vehicle
EP1321320A3 (en) * 2001-12-21 2004-11-03 KNORR-BREMSE SYSTEME FÜR NUTZFAHRZEUGE GmbH Air spring installation and device for sensing pressures
EP1342596A3 (en) * 2002-03-08 2006-07-05 Continental Aktiengesellschaft Air leakage detection in a height control device using pneumatic springs
EP1484204A3 (en) * 2003-06-04 2005-11-16 Isuzu Motors Limited Vehicle height adjustment system
US7637517B2 (en) 2003-06-04 2009-12-29 Isuzu Motors Limited Vehicle height adjustment system
EP1484204A2 (en) * 2003-06-04 2004-12-08 Isuzu Motors Limited Vehicle height adjustment system
CN100406284C (en) * 2003-06-04 2008-07-30 五十铃自动车株式会社 Vehicle height adjustment system
EP1680290A4 (en) * 2003-10-17 2007-11-07 Active Air Suspension Ltd Vehicle suspension control
EP1680290A1 (en) * 2003-10-17 2006-07-19 Active Air Suspension Limited Vehicle suspension control
WO2005123426A1 (en) * 2004-06-17 2005-12-29 Daimlerchrysler Ag Tire protection system
WO2007022989A1 (en) 2005-08-26 2007-03-01 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Method and device for detecting malfunctions in the running gear of vehicles with pneumatic suspensions
US8761999B2 (en) 2005-09-20 2014-06-24 Continental Aktienesellschaft Level control system for a vehicle, and method for operating a level control system for a vehicle
WO2007033754A1 (en) * 2005-09-20 2007-03-29 Continental Aktiengesellschaft Level control system for a vehicle, and method for the operation thereof
JP2010503572A (en) * 2006-09-16 2010-02-04 コンチネンタル アクチェンゲゼルシャフト Method for controlling and / or adjusting the height of a vehicle body of an automobile
WO2008031650A1 (en) 2006-09-16 2008-03-20 Continental Aktiengesellschaft Method for controlling and/or regulating the level of a vehicle body of a motor vehicle
EP1970229A1 (en) * 2007-03-14 2008-09-17 ArvinMeritor Technology, LLC Control unit for suspension using single pressure sensor
WO2010054917A1 (en) * 2008-11-11 2010-05-20 Continental Aktiengesellschaft Method for the functional testing of a valve
US9346334B2 (en) 2010-06-24 2016-05-24 Wabco Gmbh Air supply device for a vehicle having pneumatic devices
WO2011160735A1 (en) * 2010-06-24 2011-12-29 Wabco Gmbh Air supply device for a vehicle having pneumatic devices
CN102958715A (en) * 2010-06-24 2013-03-06 威伯科有限公司 Air supply device for a vehicle having pneumatic devices
CN102958715B (en) * 2010-06-24 2016-01-13 威伯科有限公司 For the air supply device of the vehicle with pneumatics
DE102010032046A1 (en) 2010-07-23 2012-01-26 Volkswagen Ag Method for controlling load of air-springy motor car, involves adjusting pressure of pneumatic springs, and providing target parameter with height-dependent target component that is determined depending on pivotal point of motor car
DE102010032046B4 (en) * 2010-07-23 2016-09-01 Volkswagen Ag Method for leveling an air-suspended motor vehicle and device therefor
CN103527462A (en) * 2012-07-04 2014-01-22 现代摩比斯株式会社 Method for detecting error of air compressor
CN103527462B (en) * 2012-07-04 2016-02-24 现代摩比斯株式会社 The error-detecting method of air compressor
CN105059075A (en) * 2015-09-17 2015-11-18 上海海事大学 Two-stage regulating system and method of height of car body
US11685220B2 (en) 2021-10-12 2023-06-27 DRiV Automotive Inc. Control systems and methods for suspension systems
US11691474B2 (en) 2021-10-12 2023-07-04 DRiV Automotive Inc. Suspension system tank filling systems and methods
US11697319B2 (en) 2021-10-12 2023-07-11 DRiV Automotive Inc. Suspension system with comfort valve integration
US11865889B2 (en) 2021-10-12 2024-01-09 DRiV Automotive Inc. Suspension system with comfort valves between cross-over hydraulic circuits
US11865887B2 (en) 2021-10-12 2024-01-09 DRiV Automotive Inc. Suspension system with incremental roll and pitch stiffness control
US11904841B2 (en) 2021-10-12 2024-02-20 DRiV Automotive Inc. Suspension system integration with advanced driver assistance system
US11912092B2 (en) 2021-10-12 2024-02-27 DRiV Automotive Inc. Suspension leak check systems and methods
US11919355B2 (en) 2021-10-12 2024-03-05 DRiV Automotive Inc. Valve diagnostic systems and methods
US11938772B2 (en) 2021-10-12 2024-03-26 DRiV Automotive Inc. System for grading filling of a hydraulic suspension system

Also Published As

Publication number Publication date
GB9826643D0 (en) 1999-01-27
GB9928229D0 (en) 2000-01-26
GB2344323B (en) 2002-08-14

Similar Documents

Publication Publication Date Title
GB2344323A (en) Pneumatic adjustable vehicle suspension
EP1497145B1 (en) Active adaptation of control algorithms for a central tire inflation system
USRE41756E1 (en) Tire pressure monitoring method
US7398668B2 (en) Weight sensing system and method for vehicles with non-fluid springs
US7191637B2 (en) Method for testing vibration dampers in motor vehicle
US6604414B1 (en) Supply and tire pressure sensing apparatus and method
EP1642108B1 (en) Method and system for determining a tyre load during the running of a motor vehicle
US4783089A (en) Air spring control system and method
US6666078B1 (en) Target tire pressure learning method
GB2421343A (en) Determining vehicle overload using a tyre pressure monitoring system and auto levelling system
WO2008036145A1 (en) A tire inflation method
CA2413380A1 (en) Tire pressure management system valve integrity verification method
US20150241313A1 (en) Method, control unit, and system for determining a parameter that indicates a state of at least one component of a motor vehicle
EP1044828A1 (en) Tire pressure management system
GB2373224A (en) An apparatus for measuring the ride height of a vehicle
GB2387582A (en) A vehicle air suspension system including trailer load measurement means
CN112248738A (en) Load monitoring system and method for commercial vehicle electric control air suspension
WO2024009123A2 (en) Two-piston smart valve with adjustable tire inflation
US11535077B2 (en) Automatic axle lifting system
KR101294120B1 (en) Tire pressure monitoring system and method for monitoring the same
CN115056622A (en) Control method of air suspension system and air suspension system
KR20050013762A (en) An apparatus and method of Tire presure monitoring system for low air pressure alarm

Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
746 Register noted 'licences of right' (sect. 46/1977)

Effective date: 20050713

732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)

Free format text: REGISTERED BETWEEN 20131128 AND 20131204

PCNP Patent ceased through non-payment of renewal fee

Effective date: 20181201