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WO1989009703A1 - Systeme de reglage de hauteur pour vehicule a suspension pneumatique - Google Patents

Systeme de reglage de hauteur pour vehicule a suspension pneumatique Download PDF

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Publication number
WO1989009703A1
WO1989009703A1 PCT/EP1988/000315 EP8800315W WO8909703A1 WO 1989009703 A1 WO1989009703 A1 WO 1989009703A1 EP 8800315 W EP8800315 W EP 8800315W WO 8909703 A1 WO8909703 A1 WO 8909703A1
Authority
WO
WIPO (PCT)
Prior art keywords
height
vehicle
regulating system
axle
regulation
Prior art date
Application number
PCT/EP1988/000315
Other languages
English (en)
Inventor
Jürgen PISCHKE
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to PCT/EP1988/000315 priority Critical patent/WO1989009703A1/fr
Publication of WO1989009703A1 publication Critical patent/WO1989009703A1/fr

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
    • B60G17/0162—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 a motion involving steering operation, e.g. cornering, overtaking
    • 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
    • B60G17/018—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 use of a specific signal treatment or control method
    • 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
    • B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
    • B60G21/10—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces not permanently interconnected, e.g. operative only on acceleration, only on deceleration or only at off-straight position of steering
    • B60G21/106—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces not permanently interconnected, e.g. operative only on acceleration, only on deceleration or only at off-straight position of steering transversally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/10—Type of spring
    • B60G2202/15—Fluid spring
    • B60G2202/152—Pneumatic spring
    • 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
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/02—Supply or exhaust flow rates; Pump 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
    • B60G2600/02—Retarders, delaying means, dead zones, threshold values, cut-off frequency, timer interruption
    • 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
    • B60G2600/07—Inhibiting means
    • 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
    • B60G2600/12—Sampling or average detecting; Addition or substraction
    • 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

Definitions

  • the present invention relates to a height regulating system of the kind described in the pre-characterizing clause of claim 1.
  • a height regulating system of the kind described in the pre-characterizing clause of claim 1.
  • Such a system is known from EP-A-0091 017 wherein compressed air is admitted to the air spring when a distance sensor senses that the height of the vehicle body is below a threshold and air is released from the air spring when the distance sensor senses that the body height is above the threshold.
  • Fig. 1 is a diagram of an air spring suspension system for a vehicle fitted with height regulation
  • Fig. 2 is a block diagram of the height regulating system which can be disabled on cornering in accordance with the invention. DESCRIPTION OF THE EXEMPLARY EMBODIMENTS
  • Fig. 1 shows diagrammatically a part of a vehicle body 10 attached to an axle 12 by an air spring suspension system.
  • the air spring suspension system comprises at each end of the axle 12 an air spring bellows 16,17, and a height measuring sensor 20,21, each arranged between the respective side of the vehicle body 10 and the respective end of the axle 12.
  • Each height measuring sensor 20,21 can be a simple potentiometer or variable resistor or an inductive transducer.
  • the air spring bellows 16,17 are filled and emptied as required by a compressed air reservoir 22 and respective solenoid valve arrangements 24,25.
  • the reservoir 22 is charged from a compressor (not shown) via a line 26 containing a non-return valve 28.
  • Each valve arrangement 24,25 comprises a 3-port, 2- position valve 30,31 and a 2-port, 2-position valve 32,33 in a line 34,35 between the reservoir 22 and the respective suspension bellows 16,17.
  • the valves are spring-biased to their positions shown and are operated by solenoids 36,38 or 37,39.
  • Actuation of both valves 30,32 or 31,33 of a valve arrangement 24 or 25 connects the air spring bellows 16 or 17 to the reservoir 22 in order to feed compressed air to the bellows 14 or 15 and thereby increase the height h e or h r of the vehicle body 10 relative to the axle 12 at the left-hand or right-hand side of the vehicle, respectively.
  • Actuation of the valve 32 or 33 alone connects the air spring bellows 16 or 17 via the unactuated valve 30 or 31 to exhaust and thereby decrease the height e or h r of the vehicle body 10 at the respective side.
  • each height sensor 20,21 is connected via a respective filter 50,51 to a respective comparator arrangement 52,53.
  • Each comparator arrangement 52 comprises two comparators of which one responds when the smoothed height NIV e or NIV r rises above a threshold h and the other responds when the smoothed height NIV e or NIV r is below a threshold h 2 -
  • the desired height of h 0 lies in the "dead" range between hi and h2 and this "dead" range is no more than is necessary to provide a response hysteresis and so avoid an excessive number of opening and closing operations of the valves.
  • the outputs of the four comparators are connected to a control computer 44 which controls the energisation of the valve solenoids 36,38 and 37,39 via respective end stage amplifiers 46,48 and 47,49.
  • the measured height h e temporarily decreases to a value below t ** 2 and the control computer 44 responds to open both of the solenoid valves 30 and 32 to admit compressed air to the left-hand air spring bellows 16 and so raise the vehicle body back to the desired height h 0 at that side.
  • the filters 50,51 having a time constant t serve to smooth the signals h e and h r to prevent response to oscillations which can be generated when driving on a rough road or over a pothole.
  • each comparator arrangement 54,55 receives the reference height signals h ⁇ ,h2 and comprises two comparators 56,58 or 57,59 respectively.
  • the comparators 56, 57, 58 and 59 respond respectively when h e > hi, h r > hi, h e ⁇ h2 and h r ⁇ h2 .
  • the outputs of the comparators 56,58,57,59 are connected respectively to a first input of an AND gate 60, a first input of an AND gate 61, a second input of the AND gate 61 and a second input of the AND gate 60.
  • the outputs of the AND gates 60 and 61 are connected via an OR gate to the control computer 44.
  • the comparators 58 and 57 supply signals to both inputs of the AND gate 61 which signals the control device 44 via the OR gate 62 to inhibit height regulation. Because of the filters 50 and 51, such inhibit signal acts on the control computer 44 before the correction signals h2 - NIV e and NIV r - h i reach the control computer from the comparator arrangements 52 and 53.
  • the control computer 44 contains a delay device to prevent re-establishment of height regulation until a predetermined time interval after removal of the inhibit signal has elapsed. This allows time for any swaying motion of the vehicle as it comes out of the bend to die away before the height regulation again becomes operative.

Landscapes

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

Abstract

Dans un système de réglage de hauteur pour véhicule ayant un système de suspension à amortisseur pneumatique avec réglage de la hauteur au moyen d'agencements comparateurs (52, 53) avec retard dans les filtres (50, 51), les variations de hauteur non filtrées (h et hr) aux extrémités opposées de l'essieu (12) sont comparées avec la hauteur désirée (ho) dans d'autres agencements comparateurs (54, 55). Le réglage automatique de la hauteur est invalidée dans les virages du fait que toute augmentation de la hauteur mesurée d'un côté du véhicule accompagnée en même temps d'une diminution de l'autre côté produit un signal d'interdiction via des portes (60, 61, 62). Ce signal d'interdiction est introduit dans l'ordinateur de commande (44), lequel reporte également le rétablissement du réglage de la hauteur après la disparition du signal d'interdiction.
PCT/EP1988/000315 1988-04-14 1988-04-14 Systeme de reglage de hauteur pour vehicule a suspension pneumatique WO1989009703A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP1988/000315 WO1989009703A1 (fr) 1988-04-14 1988-04-14 Systeme de reglage de hauteur pour vehicule a suspension pneumatique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1988/000315 WO1989009703A1 (fr) 1988-04-14 1988-04-14 Systeme de reglage de hauteur pour vehicule a suspension pneumatique

Publications (1)

Publication Number Publication Date
WO1989009703A1 true WO1989009703A1 (fr) 1989-10-19

Family

ID=8165262

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1988/000315 WO1989009703A1 (fr) 1988-04-14 1988-04-14 Systeme de reglage de hauteur pour vehicule a suspension pneumatique

Country Status (1)

Country Link
WO (1) WO1989009703A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0658453A3 (fr) * 1993-12-16 1996-06-26 Bosch Gmbh Robert Procédé et dispositif de régulation de niveau pour véhicule à moteur.
WO2008112763A1 (fr) * 2007-03-12 2008-09-18 Bfs Diversified Products, Llc Système de suspension de véhicule et son procédé d'utilisation
EP3778269A1 (fr) * 2019-08-16 2021-02-17 Parker Hannifin Corporation Procédé et dispositif de détection de braquage de véhicule
EP4534304A1 (fr) * 2023-10-04 2025-04-09 Volvo Truck Corporation Agencement de suspension pneumatique contenant un fluide non newtonien

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033204A2 (fr) * 1980-01-26 1981-08-05 LUCAS INDUSTRIES public limited company Systèmes de suspension pour véhicules
EP0091017A2 (fr) * 1982-04-06 1983-10-12 Nissan Motor Co., Ltd. Système automatique de réglage de la hauteur d'un véhicule
EP0174772A2 (fr) * 1984-08-28 1986-03-19 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Système de régulation du niveau pour un véhicule
EP0215315A2 (fr) * 1985-09-14 1987-03-25 Robert Bosch Gmbh Suspension pour véhicules

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033204A2 (fr) * 1980-01-26 1981-08-05 LUCAS INDUSTRIES public limited company Systèmes de suspension pour véhicules
EP0091017A2 (fr) * 1982-04-06 1983-10-12 Nissan Motor Co., Ltd. Système automatique de réglage de la hauteur d'un véhicule
EP0174772A2 (fr) * 1984-08-28 1986-03-19 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Système de régulation du niveau pour un véhicule
EP0215315A2 (fr) * 1985-09-14 1987-03-25 Robert Bosch Gmbh Suspension pour véhicules

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0658453A3 (fr) * 1993-12-16 1996-06-26 Bosch Gmbh Robert Procédé et dispositif de régulation de niveau pour véhicule à moteur.
WO2008112763A1 (fr) * 2007-03-12 2008-09-18 Bfs Diversified Products, Llc Système de suspension de véhicule et son procédé d'utilisation
US7957865B2 (en) 2007-03-12 2011-06-07 Driveright Holdings, Ltd. Vehicle suspension system and method of operating same
EP3778269A1 (fr) * 2019-08-16 2021-02-17 Parker Hannifin Corporation Procédé et dispositif de détection de braquage de véhicule
EP4534304A1 (fr) * 2023-10-04 2025-04-09 Volvo Truck Corporation Agencement de suspension pneumatique contenant un fluide non newtonien

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