GB1604416A - Vehicle suspension system - Google Patents
Vehicle suspension system Download PDFInfo
- Publication number
- GB1604416A GB1604416A GB4470377A GB4470377A GB1604416A GB 1604416 A GB1604416 A GB 1604416A GB 4470377 A GB4470377 A GB 4470377A GB 4470377 A GB4470377 A GB 4470377A GB 1604416 A GB1604416 A GB 1604416A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pressure
- velocity
- unit
- vehicle
- wheel
- 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.)
- Expired
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
- B60G17/018—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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vehicle Body Suspensions (AREA)
Description
(54) VEHICLE SUSPENSION SYSTEM
(71) We, LUCAS INDUSTRIES LIMITED, a British Company, of Great King Street,
Birmingham B 19 2XF, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
This invention relates to vehicle suspension systems and is modification of the system disclosed and claimed in our British
Patent No. 1,555,124 filed 7th June, 1975.
A system in accordance with one aspect of the present invention comprises a plurality of hydro-pneumatic suspension units, one for each of the respective wheels of the vehicle, each such unit including a cylinder and a piston slidable therein, one of the two parts comprising the piston and the cylinder being mounted on the vehicle body and the other being supportingly connected to the vehicle wheel, a dividing wall in said cylinder dividing a portion of the cylinder in which the piston is slidable from another portion thereof which is held under pressure by pneumatic pressurising means, a damping control valve connecting said one portion of the cylinder to said other portion thereof, said damping control valve being electrically controlled, a plurality of electrohydraulic pressure transducer means each arranged to sense the hydraulic pressure in said one portion of an associated one of the cylinders, a plurality of wheel velocity transducers associated with the respective suspension units and each producing an electrical output corresponding to the velocity of movement of the associated wheel axis relative to the body, and control means receiving input signals from the pressure transducer means and the velocity transducers and controlling said damping control valves to vary the damping effect of each damping control valve so as to establish a desired functional inter-relationship between the pressure and velocity signals.
In accordance with another aspect of the present invention there is provided a vehicle suspension system comprising a plurality of hydraulic suspension units, one for each of the respective wheels of the vehicle, electrohydraulic transducer means associated with each hydraulic suspension unit and producing an electrical output corresponding to the hydraulic pressure in the associated suspension unit, a plurality of velocity transducers associated respectively with the suspension units and each producing an output corresponding to the velocity of movement of the associated wheel axis relative to the vehicle body, a plurality of damping control valves associated respectively with the respective suspension units and control means for the damping control valves, said control means having inputs from the pressure transducer means and the velocity transducers and providing outputs to vary the damping effect of each damping valve so as to establish a desired functional inter-relationship between the pressure and velocity outputs, and said control means further including means sensitive to said pressure outputs for overridingly opening the damping control valve of any of the suspension units when the pressure in such suspension unit is above a predetermined upper limit or below a predetermined lower limit.
An example of the invention is shown in the accompanying drawings in which:
Figure 1 is a diagrammatic representation of one of a plurality of hydropneumatic suspension units used in the system,
Figure 2 is a block diagram of the electrical control arrangement used in the system and
Figure 3 is a circuit diagram of a pressure control shown in Figure 2.
The unit shown in Figure 1 includes a cylinder 10 in one portion 11 of which a piston 12 is slidable. The cylinder 10 is mounted on the vehicle body and the piston 12 is mounted on a wheel carrier 13 so that the unit transmits the weight of the vehicle to the wheels 14. The cylinder 10 has another portion 15 separated from the portion 11 by a dividing wall 16 and closed off by a flexible diaphragm 17 separating the portion 15 from a pressurised gas chamber 18. the gas acting to provide resilience.
Communication between the portions 11 and 15 is via an electrically controlled damping control valve 19.
An hydraulic pressure transducer 20 is associated with the unit and is arranged to sense the hydraulic pressure in the first mentioned portion 11 of the cylinder, such pressure being indicative of the force being carried by the unit in question. Each unit also has associated with it a velocity transducer 21 which produces an electrical output signal corresponding to the vertical component of the velocity of the wheel carrier 13 relative to the vehicle body. Such transducer 21, may of course, be a position transducer associated withan electronic differentiating circuit.
The transducers 20a to 20dand 21a to 21d associated with the four wheels of the vehicle all provided input signals to a common electronic control circuit controlling the damping control valves 19a to l9d. The circuit is the same as that described in Patent
No. 1,555,124, with the exception that a pressure control 60 for each channel is added.
The pressure control 60a, as shown in
Figure 3, comprises two comparators 61a, 62a connected to detect when the pressure signal from the associated pressure transducer 20a is above an upper limit and below a lower limit respectively. The outputs of the comparators 61 a, 62a are combined by an
OR gate 63a the output of which is applied to a trigger circuit 64a with hysteresis to prevent spurious triggering by interference pulses.
The output of the trigger circuit 64a is connected via an absolute value circuit 65a to the output amplifier of the associated channel.
The result of this added circuit in each channel is firstly to limit the pressure which can be reached in each hydro-pneumatic suspension unit to a level at which no damage is suffered by the unit by overridingly opening the damping control valve. In addition in the event of very low pressure being detected, indicating that the wheel in question has lost contact with the ground, the damping control valve is overridingly opened to allow the wheel to move rapidly back into contact with the ground. The lower limit can be set lower than the pressure which exists in the suspension unit when that unit is fully extended (even though the wheel is out of contact with the ground), so as to override the normal control only when the wheel is off the ground and travelling freely.
WHAT WE CLAIM IS:- 1. A vehicle suspension system comprises ing a plurality of hydro-pneumatic suspension units, one for each of the respective wheels of the vehicle, each such unit including a cylinder and a piston slidable therein, one of the two parts comprising the piston and the cylinder being mounted on the vehicle body and the other being supportingly connected to the vehicle wheel, a dividing wall in said cylinder dividing a portion of the cylinder in which the piston is slidable from another portion thereof which is held under pressure by pneumatic pressurising means, a damping control valve connecting said one portion of the cylinder to said other portion thereof, said damping control valve being electrically controlled, a plurality of electrohydraulic pressure transducer means each arranged to sense the hydraulic presure in said one portion of an associated one of the cylinders, a plurality of wheel velocity transducers associated with the respective suspension units and each producing an electrical output corresponding to the velocity of movement of the associated wheel axis relative to the body, and control means receiving input signals from the pressure transducer means and the velocity transducers and controlling said damping control valves to vary the damping effect of each damping control valve so as to establish a desired functional inter-relationship between the pressure and velocity signals.
2. A vehicle suspension system comprising a plurality of hydraulic suspension units, one for each of the respective wheels of the vehicle, electro-hydraulic transducer means associated with each hydraulic suspension unit and producing an electrical output corresponding to the hydraulic pressure in the associated suspension unit, a plurality of velocity transducers associated respectively with the suspension units and each producing an output corresponding to the velocity of movement of the associated wheel axis relative to the vehicle body, a plurality of damping control valves associated respectively with the respective suspension units and control means for the damping control valves, said control means having inputs from the pressure transducer means and the velocity transducers and providing outputs to vary the damping effect of each damping valve so as to establish a desired functional inter-relationship between the pressure and velocity outputs, and said control means further including means sensitive to said pressure outputs for overridingly opening the damping control valve of any of the suspension units when the pressure in such suspension unit is above a predetermined upper
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (3)
1. A vehicle suspension system comprises ing a plurality of hydro-pneumatic suspension units, one for each of the respective wheels of the vehicle, each such unit including a cylinder and a piston slidable therein, one of the two parts comprising the piston and the cylinder being mounted on the vehicle body and the other being supportingly connected to the vehicle wheel, a dividing wall in said cylinder dividing a portion of the cylinder in which the piston is slidable from another portion thereof which is held under pressure by pneumatic pressurising means, a damping control valve connecting said one portion of the cylinder to said other portion thereof, said damping control valve being electrically controlled, a plurality of electrohydraulic pressure transducer means each arranged to sense the hydraulic presure in said one portion of an associated one of the cylinders, a plurality of wheel velocity transducers associated with the respective suspension units and each producing an electrical output corresponding to the velocity of movement of the associated wheel axis relative to the body, and control means receiving input signals from the pressure transducer means and the velocity transducers and controlling said damping control valves to vary the damping effect of each damping control valve so as to establish a desired functional inter-relationship between the pressure and velocity signals.
2. A vehicle suspension system comprising a plurality of hydraulic suspension units, one for each of the respective wheels of the vehicle, electro-hydraulic transducer means associated with each hydraulic suspension unit and producing an electrical output corresponding to the hydraulic pressure in the associated suspension unit, a plurality of velocity transducers associated respectively with the suspension units and each producing an output corresponding to the velocity of movement of the associated wheel axis relative to the vehicle body, a plurality of damping control valves associated respectively with the respective suspension units and control means for the damping control valves, said control means having inputs from the pressure transducer means and the velocity transducers and providing outputs to vary the damping effect of each damping valve so as to establish a desired functional inter-relationship between the pressure and velocity outputs, and said control means further including means sensitive to said pressure outputs for overridingly opening the damping control valve of any of the suspension units when the pressure in such suspension unit is above a predetermined upper
limit or below a predetermined lower limit.
3. A vehicle suspension system substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4470377A GB1604416A (en) | 1978-05-30 | 1978-05-30 | Vehicle suspension system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4470377A GB1604416A (en) | 1978-05-30 | 1978-05-30 | Vehicle suspension system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1604416A true GB1604416A (en) | 1981-12-09 |
Family
ID=10434400
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4470377A Expired GB1604416A (en) | 1978-05-30 | 1978-05-30 | Vehicle suspension system |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1604416A (en) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0080291A2 (en) * | 1981-11-17 | 1983-06-01 | Lonnie K. Woods | Computer optimized adaptive suspension system having combined shock absorber/air spring unit |
DE3343338A1 (en) * | 1982-11-30 | 1984-05-30 | Atsugi Motor Parts Co. Ltd., Atsugi, Kanagawa | ELECTRONIC CONTROL SYSTEM FOR ADJUSTABLE SHOCK ABSORBERS |
EP0114757A1 (en) * | 1983-01-21 | 1984-08-01 | Group Lotus Plc | Vehicle suspension system |
EP0127094A2 (en) * | 1983-05-20 | 1984-12-05 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Active suspension apparatus |
DE3427843A1 (en) * | 1983-07-29 | 1985-02-14 | Tokico Ltd., Kawasaki, Kanagawa | HYDRO-PNEUMATIC SUSPENSION DEVICE |
EP0133589A2 (en) * | 1983-08-15 | 1985-02-27 | Lonnie K. Woods | Computer optimized adaptive suspension system |
DE3406875A1 (en) * | 1984-02-25 | 1985-09-05 | Boge Gmbh, 5208 Eitorf | VIBRATION DAMPER FOR VEHICLES |
EP0162818A1 (en) * | 1984-05-11 | 1985-11-27 | FIAT AUTO S.p.A. | Device for the control of the suspension shock-absorbers particularly for motor vehicles |
DE3518503C1 (en) * | 1985-05-23 | 1986-10-23 | Daimler-Benz Ag, 7000 Stuttgart | Device for computer-aided, road-dependent control of dampers of a vehicle suspension |
US4634142A (en) * | 1983-08-15 | 1987-01-06 | C & K Venture Income I-Coast | Computer optimized adaptive suspension system |
US4722548A (en) * | 1981-11-17 | 1988-02-02 | Hamilton James M | Computer optimized adaptive suspension system having combined shock absorber/air spring unit |
FR2660705A1 (en) * | 1990-04-10 | 1991-10-11 | Renault | Device for servo control of a hydraulic jack in terms of force and motor vehicle suspension equipped with such a device |
FR2683186A1 (en) * | 1991-11-02 | 1993-05-07 | Fichtel & Sachs Ag | METHOD FOR INFLUENCING AN ELASTICAL SUPPORT SYSTEM AND SHOCK ABSORBER BETWEEN THE CHASSIS AND BODY OF A VEHICLE AND A SUPPORT SYSTEM FOR ITS IMPLEMENTATION |
US5529152A (en) * | 1994-07-08 | 1996-06-25 | Aimrite Systems International, Inc. | Variable constant force hydraulic components and systems |
US6502837B1 (en) | 1998-11-11 | 2003-01-07 | Kenmar Company Trust | Enhanced computer optimized adaptive suspension system and method |
US11279196B2 (en) * | 2018-05-16 | 2022-03-22 | Toyota Jidosha Kabushiki Kaisha | Damping force control device |
-
1978
- 1978-05-30 GB GB4470377A patent/GB1604416A/en not_active Expired
Cited By (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0080291A2 (en) * | 1981-11-17 | 1983-06-01 | Lonnie K. Woods | Computer optimized adaptive suspension system having combined shock absorber/air spring unit |
EP0080291A3 (en) * | 1981-11-17 | 1984-07-04 | Lonnie K. Woods | Computer optimized adaptive suspension system having combined shock absorber/air spring unit |
US4722548A (en) * | 1981-11-17 | 1988-02-02 | Hamilton James M | Computer optimized adaptive suspension system having combined shock absorber/air spring unit |
DE3343338A1 (en) * | 1982-11-30 | 1984-05-30 | Atsugi Motor Parts Co. Ltd., Atsugi, Kanagawa | ELECTRONIC CONTROL SYSTEM FOR ADJUSTABLE SHOCK ABSORBERS |
WO1984002886A1 (en) * | 1983-01-21 | 1984-08-02 | Lotus Car | Vehicle suspension system |
EP0114757A1 (en) * | 1983-01-21 | 1984-08-01 | Group Lotus Plc | Vehicle suspension system |
US4625993A (en) * | 1983-01-21 | 1986-12-02 | Group Lotus Public Limited Company | Vehicle suspension system |
EP0127094A2 (en) * | 1983-05-20 | 1984-12-05 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Active suspension apparatus |
EP0127094A3 (en) * | 1983-05-20 | 1985-11-27 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Active suspension apparatus |
DE3427843A1 (en) * | 1983-07-29 | 1985-02-14 | Tokico Ltd., Kawasaki, Kanagawa | HYDRO-PNEUMATIC SUSPENSION DEVICE |
EP0133589A2 (en) * | 1983-08-15 | 1985-02-27 | Lonnie K. Woods | Computer optimized adaptive suspension system |
US4634142A (en) * | 1983-08-15 | 1987-01-06 | C & K Venture Income I-Coast | Computer optimized adaptive suspension system |
EP0133589A3 (en) * | 1983-08-15 | 1986-12-17 | Lonnie K. Woods | Computer optimized adaptive suspension system |
DE3406875A1 (en) * | 1984-02-25 | 1985-09-05 | Boge Gmbh, 5208 Eitorf | VIBRATION DAMPER FOR VEHICLES |
GB2154700A (en) * | 1984-02-25 | 1985-09-11 | Boge Gmbh | Control of dampers for vehicle suspension |
EP0162818A1 (en) * | 1984-05-11 | 1985-11-27 | FIAT AUTO S.p.A. | Device for the control of the suspension shock-absorbers particularly for motor vehicles |
DE3518503C1 (en) * | 1985-05-23 | 1986-10-23 | Daimler-Benz Ag, 7000 Stuttgart | Device for computer-aided, road-dependent control of dampers of a vehicle suspension |
FR2582262A1 (en) * | 1985-05-23 | 1986-11-28 | Daimler Benz Ag | DEVICE FOR CONTROLLING DAMPERS OF A MOTOR VEHICLE |
FR2660705A1 (en) * | 1990-04-10 | 1991-10-11 | Renault | Device for servo control of a hydraulic jack in terms of force and motor vehicle suspension equipped with such a device |
FR2683186A1 (en) * | 1991-11-02 | 1993-05-07 | Fichtel & Sachs Ag | METHOD FOR INFLUENCING AN ELASTICAL SUPPORT SYSTEM AND SHOCK ABSORBER BETWEEN THE CHASSIS AND BODY OF A VEHICLE AND A SUPPORT SYSTEM FOR ITS IMPLEMENTATION |
US5527060A (en) * | 1991-11-02 | 1996-06-18 | Fichtel & Sachs Ag | Load-sensitive vehicular suspension system |
US5529152A (en) * | 1994-07-08 | 1996-06-25 | Aimrite Systems International, Inc. | Variable constant force hydraulic components and systems |
US6502837B1 (en) | 1998-11-11 | 2003-01-07 | Kenmar Company Trust | Enhanced computer optimized adaptive suspension system and method |
US7076351B2 (en) | 1998-11-11 | 2006-07-11 | Great Northern Technologies, Llc | Enhanced computer optimized adaptive suspension system and method |
US11279196B2 (en) * | 2018-05-16 | 2022-03-22 | Toyota Jidosha Kabushiki Kaisha | Damping force control device |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |