GB2234211A - Control of a vehicle suspension - Google Patents
Control of a vehicle suspension Download PDFInfo
- Publication number
- GB2234211A GB2234211A GB9011973A GB9011973A GB2234211A GB 2234211 A GB2234211 A GB 2234211A GB 9011973 A GB9011973 A GB 9011973A GB 9011973 A GB9011973 A GB 9011973A GB 2234211 A GB2234211 A GB 2234211A
- Authority
- GB
- United Kingdom
- Prior art keywords
- support unit
- acceleration
- characteristic
- control apparatus
- vehicle body
- 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
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
-
- 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
- B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
- B60G2400/10—Acceleration; Deceleration
- B60G2400/102—Acceleration; Deceleration 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
- B60G2400/10—Acceleration; Deceleration
- B60G2400/104—Acceleration; Deceleration lateral or transversal with regard to vehicle
-
- 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
- B60G2400/20—Speed
- B60G2400/204—Vehicle speed
-
- 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
- B60G2400/40—Steering conditions
- B60G2400/41—Steering angle
- B60G2400/412—Steering angle of steering wheel or column
-
- 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
- B60G2400/80—Exterior conditions
- B60G2400/82—Ground surface
- B60G2400/821—Uneven, rough road sensing affecting vehicle body vibration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2500/00—Indexing codes relating to the regulated action or device
- B60G2500/10—Damping action or damper
-
- 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
- B60G2500/22—Spring constant
-
- 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
- B60G2600/04—Means for informing, instructing or displaying
-
- 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
- B60G2600/16—Integrating means, i.e. integral control
-
- 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
- B60G2600/18—Automatic control means
-
- 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
- B60G2800/162—Reducing road induced vibrations
Abstract
An active vehicle suspension control is described in which vertical and/or lateral acceleration of a vehicle body is detected and used to control a characteristic of a suspension for supporting the vehicle body, i.e. a damping force and/or a spring constant of a suspension, or torsion quantity of a stabilizer, on the basis of the quantity of the acceleration or a differentiated value thereof and the duration of the acceleration equal to or more than a predetermined value.
Description
CONTROL APPARATUS OF SUPPORT UNIT
The present invention relates to a control apparatus for controlling characteristic of a support unit, in other words, a suspension and/or a stabilizer, for supporting a vehicle body in order to restrain vibrations thereof.
It is better for improving comfort to ride in while a vehicle is running to adapt characteristic of a support unit of the vehicle body to be SOFT. Concretely, it is better that a damping force of the suspension is reduced, a spring constant of the same is small and soft, and torsion quantity of the stabilizer is reduced. On the other hand, it is better for improving steering stability to adapt the characteristic of the support unit of vehicle body to be HARD.
Concretely, it is better that a damping force of the suspension is large, the spring constant thereof is large and hard, aiid torsion < uanLi ty of tile stabilizer is larger.
A change-oser system has tween developed which has set
SOFT (or MEDIUM between HARD and SOFT) the characteristic of the support unit in the normal running condition and changes over the characteristic to be HARD by driving change-over means for changing-over the characteristic of the support unit corresponding to necessity, such as variation, in the road surface condition or the posture of vehicle body. Such system is disclosed in, for example, the Japanese Patent Application Laid-Open No. 60-47709, which measures the duration of acceleration not less than a predetermined value of vibration of the body, so that only when the duration is not less than a predetermined time, the damping force of the suspension is raised or the spring constant thereof is increased.
In such example, poor comfort to ride in caused by vertical vibrations of the vehicle body in the vicinity of the above-spring resonance frequency is detected on the basis of the duration of acceleration not less than the predetermined value, thereby controlling harder the characteristic of suspension. In this case, unless at least a half cycle period of time of the decision frequency in the vicinity of the above-spring resonance frequency passes, it is impossible to decide whether or not the characteristic of suspension is properly controlled, thereby delaying the control. Also, it is defective that an initially large body shock caused when the vehicle runs over a large mound, or a large variation in the posture of vehicle body, is difficult to properly control.
Also, it is judged whether the vehicle is running on a bad road and the characteristic of the suspension or the stabilizer is changed to MEDIUM on the basis of the frequency component of below-spring vibration of the vehicle body or a vertical or lateral vibration pattern, thereby executing control to keep good comfort to ride and in touch with a bad road. In this case, control cannot be executed even on the bad road until reliable decision for the vibration frequency or the vibration pattern ends.
As the above-mentioned, at an initial stage of vibration of the vehicle body, it is not clear whether the characteristic of suspension or stabilizer is to be HARD or
MEDIUM, and it takes much time to determine an optimum control parameter only from the information of vibration frequency. Also, in the following stage, when the vibration waveform represents a pattern of complicatedly superposing the above-spring vibration on the below-spring vibration, the following decision is imperfect and there is a possibility that the decision further delays, as disclosed in the
Japanese Patent Application Laid-Open No.63-8010.
An object of the present invention is to provide a control apparatus of support unit, which is capable of reliably restraining a shock on the vehicle body or useless vibrations thereof even when the vehicle runs over a large mound.
Another object of the present invention is to provide a control apparatus of support unit, which is capable of restraining in the smallest time poor comfort to ride in caused by a false decision.
The control apparatus of support unit of the present invention detects the acceleration of a vehicle body and changes over the characteristic of the support unit on the basis of the detected acceleration and the duration of detecting the acceleration not less than a predetermined value, or on the basis of a differentiated value of the detected acceleration and the duration of detecting the acceleration not less than a predetermined value. When quantity of the detected acceleration or the differentiated value thereof is not less than a predetermined value, the characteristic of support unit is set to a certain step so that it is decided whether the characteristic of support unit is maintained in this step or in another step corresponding to the duration of detecting the acceleration not less than the predetermined value.
Herein, the characteristic of the support unit is a damping force or a spring constant of a suspension, or torsion quantity of a stabilizer. Also, the detected acceleration of the vehicle body is the vertical and/or lateral acceleration thereof.
The above and further objects and features of the invention will more fully be apparent from the following detailed description with accompanying drawings.
Fig. 1 is a block diagram showing a basic construction of a control apparatus of the present invention,
Fig. 2 is a perspective view showing a condition where each member is mounted in a vehicle, when the present invention is applied to change-over of damping force of a suspension,
Fig. 3 is a block diagram showing a construction of each member shown in Fig. 2,
Fig. 4 is a flow chart showing a procedure of first embodiment of the present invention, and
Fig. 5 is a flow chart showing a procedure of second embodiment of the present invention.
(First Embodiment)
Fig. 1 is a block diagram of a control apparatus of the present invention, in which a vehicle body 1 is provided with acceleration detecting means 2 for detecting the acceleration vertical, lateral or in both the directions, of the vehicle body 1, so that a detection signal obtained by the acceleration detecting means 2 is output to a control device 7. Between each wheel 3a, 3b and the vehicle body 1 is disposed a suspension as a support unit. Between wheels 3a and 3b is disposed a stabilizer as a support unit. A damping force of the suspension is changed-over into three steps of HARD, MEDIUM and SOFT by a damping force changing means 4 as change-over means. A spring constant of the suspension is changed-over into three steps of HARD, MEDIUM and
SOFT by a spring constant changing means 5 as change-over means.Furthermore, torsion quantity of the stabilizer is changed-over into three steps of HARD, MEDIUM and SOFT by a torsion quantity changing means 6 as change-over means. The damping force changing means 4, spring constant changing means 5 and torsion quantity changing means 6 all change over characteristic of the support unit corresponding thereto on the basis of a command signal from the control device 7. The control device 7 decides quantity of acceleration and duration of acceleration not less than a first predetermined value on the basis of detection signal from the acceleration detecting means 2, thereby outputting to each change-over means the command signal for changing over the characteristic. The damping force changing means 4 and the spring constaiit changing means 5 use ones disclosed in
Japanese Patent Application Laid-Open No.60-47709 or
No.240511. And the torsion quantity changing means 6 uses one disclosed in Japanese Patent Application Laid-Open
No.63-25119 or No.63-28709.
Figs. 2 and 3 show an example of applying the control apparatus of the invention to change-over of damping force of the suspension, in which the control device 7 comprising a microcomputer is given outputs of a steering sensor 11 for detecting steering condition of a handle, a speed sensor 12 for detecting a vehicle speed, an accelerator sensor 13 for detecting operation of acceleration and deceleration for the vehicle body 1, a brake switch 14 for detecting the braking action, an acceleration sensor 20 as the acceleration detecting means, for detecting the vertical acceleration of the vehicle body 11 and a select switch 15 for setting a standard for decision of characteristic of the damping force.The control device 7 controls four damping force change means 4 for changing over characteristics of four suspensions and an indicator 16 corresponding to the outputs from these sensors and switches.
The acceleration sensor 20 for detecting the vertical acceleration uses an acceleration pickup composed of, for example, a piezoelectric member. a sensor of a differential transformer type, or an acceleration sensor of a semiconductor strain gauge type for a car, and continuously outputs the vertical acceleration by analog voltage on the basis of the output level during the zero acceleration. The output of acceleration sensor 20 is digital-converted and thereafter input to the control device 7 and its signal level and variation duration are obtained. In addition, in the Fig. 2 example, one acceleration sensor 20 is mounted at the center of gravity of the vehicle body 1, but its mounting position may be the utmost end of vehicle body 1, or the number of sensor 20 may be two in the front and the rear, or one sensor may be provided at every suspension for each wheel.
Next, explanation will be given on the procedure of the control device 7 with reference to Fig. 4.
At first, in Step S1, a signal of the acceleration sensor 20 is read, in Step S2, quantity of vertical acceleration on the boundary of a desired reference point (+OG) is decided, and in Step S3, the duration of acceleration not less than a first predetermined value is counted by a timer.
In Step S4, it is judged whether or not the acceleration not less than a second predetermined value is generated. When generated (YES in Step S4), the procedure advances to Step S5, in which the damping force of suspension is set to MEDIUM and the timer for maintaining this state is set to a predetermined time to start counting, and if NO in Step S4, the procedure advances to Step S6.
In Step S6, it is judged whether or not the timer for maintaining a higher damping force is operating. If in operation (YES in Step S6), the procedure advances to Step
S7. If not in operation (NO in Step S6), the procedure advances to Step S11 to thereby return the damping force to the basic SOFT.
In Step S7, it is judged whether or not measurement of duration of acceleration not less than the first predetermined value ends and conditions to raise the present state of MEDIUM to HARD, are satisfied. If satisfies (YES in Step
S7), that is, the measured duration is a predetermined value corresponding to acceleration of vibration near the abovespring resonance of the vehicle body 1, in Step S8, the present state of MEDIUM is changed to HARD and a timer for maintaining HARD is set to a predetermined time, thereby starting counting. If not satisfied (NO in Step S7), the procedure advances to Step S9, so that it is judged whether or not measurement of duration of acceleration not less than the first predetermined value ends and conditions to maintain MEDIUM are satisfied.
When conditions to maintain MEDIUM are satisfied (YES in Step S9), in other words, when a predetermined quantity of vibration of vertical acceleration is about medium or the duration of vibration is a predetermined value corresponding to the below-spring resonance of the vehicle body 1, in Step
S10, the damping force is changed to MEDIUM a timer for maintaining MEDIUM is set (or reset). On the other hand, if
NO in Step S9, the present state is not changed and the procedure returns.
In addition, in Step S4, it is judged whether or not the acceleration not less than the second predetermined value continues for the predetermined time or more, which is effective for removing a passing-away shock, such as noises.
In addition, in the above-mentioned example, the procedure on the basis of the vertical acceleration of the vehicle body 1 is described, but the damping force of the suspension on the basis of the lateral acceleration of vehicle body 1 is adjusted as the same as the above. In this case, the judgment reference in Step S7 is whether or not the duration of acceleration not less than the first predetermined value corresponds to the lateral or roll-directional resonance. YES in Step S9 indicates the case where the duration of vibration is a predetermined value corresponding to the lateral acceleration of vehicle body 1 on a bad road.
(Second Embodiment)
The present embodiment of the control apparatus of the invention is the same in construction as the first embodiment shown in Figs. 1, 2 and 3. In the second embodiment, however, a differentiated value of acceleration and duration of acceleration not less than the first predetermined value are decided on the basis of the information from the ac celeration detecting means 2, so that a command signal is output, corresponding to the result of decision, to the damping force changing means 4, spring constant changing means 5 and torsion quantity changing means 6.
Next, explanation will be given on the procedure of the control device 7 of the second embodiment with reference to
Fig. 5.
At first, in Step S1, a signal of the acceleration sensor 20 is read, in Step S2, a differentiated value of vertical acceleration on the boundary of a desired reference point (jOG), in other words, a variation in the acceleration per unit time, is decided, and in Step S3, the duration of acceleration not less than a first predetermined value is counted by a timer.
In Step S4, it is judged whether or not a differentiated value of acceleration not less than a second predetermined value is generated. If generated (YES in Step
S4), the procedure advances to Step S5. In Step S5, the damping force of the suspension is set to MEDIUM and the timer for maintaining this state is set to a predetermined time to start counting. If NO in Step S4, the procedure advances to Step S6.
In Step S6, it is judged whether or not the timer for maintaining a higher damping force is operating. If operating (YES in Step S6), the procedure advances to Step S7.
If not operating (NO in Step S6), the procedure advances to
Step S11 to thereby return the damping force to the basis
SOFT.
In Step S7, it is judged whether or not measurement of duration of acceleration not less than the first predetermined value ends and conditions to raise the present state (MEDIUM) to HARD are satisfied. If satisfied (YES in Step S?), in other words, where the measured duration is near a half cycle period of vibration of the above-spring resonance of vehicle body 1, in Step S8, the present state of MEDIUM is changed to HARD and a timer for maintaining HARD is set to a predetermined time to start counting. If not satisfied (NO in Step S7), the procedure advances to Step S9 so as to judge whether or not measurement of duration of acceleration not less than the first predetermined value ends and conditions to maintain MEDIUM are satisfied.
When conditions to maintain MEDIUM are satisfied (YES in Step S9), in other words, when a predetermined quantity of vibration of vertical acceleration is about medium or the duration of vibration is near a half cycle period of the below-spring resonance of vehicle body 1, in Step S10, the damping force is changed to MEDIUM ad a timer for maintaining MEDIUM is set (or reset). On the other hand, if NO in
Step S9, the present state is not changed and the procedure returns.
In addition, when it is intended to be judged in Step S4 whether or not the differentiated value of acceleration is not less than the second predetermined value and the acceleration is not less than a predetermined value, it is effective for removing a passing-away shock, such as noises.
In addition, the aforesaid embodiment is described of its procedure on the basis of vertical acceleration of vehicle body 1, but the damping force of suspension can be adjusted on the basis of lateral acceleration of vehicle body 1 as the same as the above. In this case, the judgment reference in Step S7 is whether or not the duration of acceleration not less than the first predetermined value is close to a half cycle period of lateral or roll-directional resonance. When YES in Step S9, the duration of vibration is close to a half cycle period of lateral acceleration of vehicle body 1 on a bad road.
In the above-mentioned first and second embodiments, the examples of controlling the damping force of suspension are described, but the spring constant of suspension and torsion quantity of stabilizer are quite similarly controllable. All of them may of course be simultaneously controlled.
Also, the characteristic is changed over into 3 steps of SOFT, MEDIUM and HARD, but not limited thereto. The present invention is applicable to a case where the char acteristic is changed-over into two or four steps or more.
As this invention may be embodied in several forms without departing from the spirit of essential characteristics thereof, the present embodiment is therefore illustrative and not restrictive, since the scope of the invention is defined by the appended claims rather than by the description preceding them, and all changes that fall within the meets and bounds of the claims, or equivalence of such meets and bounds thereof are therefore intended to be embraced by the claims.
Claims (16)
1. A control apparatus of support unit for supporting a vehicle body which controls characteristic thereof, comprising:
detecting means for detecting acceleration of said vehicle body;
change-over means for changing over the characteristic of said support unit into a plurality of steps; and
control means for controlling said change-over means on the basis of the acceleration detected by said detecting means and of duration for which the acceleration equal to or more than a first predetermined value is detected.
2. A control apparatus of support unit according to
Claim 1, wherein said control means, when the acceleration detected by said detecting means is equal to or more than a second predetermined value, controls said change-over means so that the characteristic of said support unit becomes a first step.
3. A control apparatus of support unit according to
Claim 2, wherein said control means decides whether the characteristic of said support unit is maintained in said first step or changed to a second step corresponding to the length of said duration.
4. A control apparatus of support unit according to
Claim I, wherein said support unit is a suspension and said characteristic is a damping force ad/or a spring constant of said suspension.
5. A control apparatus of support unit according to
Claim 1, wherein said support unit is a stabilizer and said characteristic is torsion quantity of said stabilizer.
6. A control apparatus of support unit according to
Claim 1, wherein said support unit is a suspension and a stabilizer, and said characteristic is a damping force and/or a spring constant of said suspension and torsion quantity of said stabilizer.
7. A control apparatus of support unit according to
Claim 1, wherein said detecting means detects vertical acceleration of said vehicle body.
8. A control apparatus of support unit according to
Claim 1, wherein said detecting means detects lateral acceleration of said vehicle body.
9. A control apparatus of support unit for supporting a vehicle body which controls characteristic thereof, comprising:
detecting means for detecting acceleration of said vehicle body;
change-over means for changing over the characteristic of said support unit into a plurality of steps; and
control means for controlling said change-over means on the basis of a differentiated value of the acceleration detected by said detecting means and of duration for which the acceleration equal to or more than a first predetermined value is detected.
10. A control apparatus of support unit according to
Claim 9, wherein said control means, when the differentiated value of the acceleration detected by said detecting means is equal to or more than a second predetermined value, controls said change-over means so that the characteristic of said support unit becomes a first step.
11. A control apparatus of support unit according to
Claim 10, wherein said control means decides whether the characteristics of said support unit is maintained in said first step or changed to a second step corresponding to the length of said duration.
12. A control apparatus of support unit according to
Claim 9, wherein said support unit is a suspension and said characteristic is a damping force and/or a spring constant of said suspension.
13. A control apparatus of support unit according to
Claim 9, wherein said support unit is a stabilizer and said characteristic is torsion quantity of said stabilizer.
14. A control apparatus of support unit according to
Claim 9, wherein said support unit is a suspension and a stabilizer, and said characteristic is a damping force and/or a spring constant of said suspension and torsion quantity of said stabilizer.
15. A control apparatus of support unit according to
Claim 9, wherein said detecting means detects vertical acceleration of said vehicle body.
16. A control apparatus of support unit according to
Claim 9, wherein said detecting means detects lateral acceleration of said vehicle body.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13522189 | 1989-05-29 | ||
| JP13522289 | 1989-05-29 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9011973D0 GB9011973D0 (en) | 1990-07-18 |
| GB2234211A true GB2234211A (en) | 1991-01-30 |
| GB2234211B GB2234211B (en) | 1993-11-10 |
Family
ID=26469116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9011973A Expired - Fee Related GB2234211B (en) | 1989-05-29 | 1990-05-29 | Control appartaus of support unit |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH0374215A (en) |
| KR (1) | KR930009380B1 (en) |
| GB (1) | GB2234211B (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2279425A (en) * | 1991-01-31 | 1995-01-04 | Fichtel & Sachs Ag | Controlling a vibration damper |
| GB2282784A (en) * | 1993-10-08 | 1995-04-19 | Acg France | Vehicle suspension system |
| US5485417A (en) * | 1991-01-31 | 1996-01-16 | Fichtel & Sachs Ag | Process and arrangement for controlling a vibration damper |
| EP0780748A2 (en) * | 1992-02-17 | 1997-06-25 | Hitachi, Ltd. | A controller for controlling a moving object, a method of controlling that object, and a sensor for use in such a controller |
| US6282471B1 (en) | 1998-06-09 | 2001-08-28 | Land Rover Group Limited | Vehicle roll control |
| US11285964B2 (en) | 2014-10-31 | 2022-03-29 | Polaris Industries Inc. | System and method for controlling a vehicle |
| US11332071B2 (en) | 2004-10-05 | 2022-05-17 | Vision Works Ip Corporation | Absolute acceleration sensor for use within moving vehicles |
| US11400785B2 (en) | 2012-11-07 | 2022-08-02 | Polaris Industries Inc. | Vehicle having suspension with continuous damping control |
| US11407357B2 (en) | 2013-08-28 | 2022-08-09 | Vision Works Ip Corporation | Absolute acceleration sensor for use within moving vehicles |
| US11479075B2 (en) | 2017-06-09 | 2022-10-25 | Polaris Industries Inc. | Adjustable vehicle suspension system |
| US11577705B2 (en) | 2004-10-05 | 2023-02-14 | VisionWorks IP Corporation | Absolute acceleration sensor for use within moving vehicles |
| US11878678B2 (en) | 2016-11-18 | 2024-01-23 | Polaris Industries Inc. | Vehicle having adjustable suspension |
| US11884117B2 (en) | 2018-11-21 | 2024-01-30 | Polaris Industries Inc. | Vehicle having adjustable compression and rebound damping |
| US11904648B2 (en) | 2020-07-17 | 2024-02-20 | Polaris Industries Inc. | Adjustable suspensions and vehicle operation for off-road recreational vehicles |
| US11963064B2 (en) | 2016-02-10 | 2024-04-16 | Polaris Industries Inc. | Recreational vehicle group management system |
| US11970036B2 (en) | 2022-06-27 | 2024-04-30 | Polaris Industries Inc. | Vehicle having suspension with continuous damping control |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030015044A (en) * | 2001-08-14 | 2003-02-20 | 현대자동차주식회사 | Suspension for vehicle |
| JP5814014B2 (en) * | 2011-07-05 | 2015-11-17 | クラリオン株式会社 | Navigation device |
| IT201700024189A1 (en) * | 2017-03-03 | 2018-09-03 | Piaggio & C Spa | LEAKAGE CONTRAST METHOD PROMOTED BY A RESONANCE SWING IN A THREE-WHEEL-ROLLING MOTOR WHEEL |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0001009A1 (en) * | 1977-08-22 | 1979-03-07 | Spring Hill Laboratories, Inc. | A vehicle suspension system |
| EP0167159A2 (en) * | 1984-07-04 | 1986-01-08 | Nissan Motor Co., Ltd. | Automotive suspension control system ensuring riding comfort and driving stability, and especially riding comfort on undulating roads |
| EP0227343A1 (en) * | 1985-12-16 | 1987-07-01 | Ford Motor Company Limited | Control system for an adjustable suspension |
| GB2211154A (en) * | 1987-10-15 | 1989-06-28 | Mitsubishi Motors Corp | Anti-dive vehicle suspension apparatus |
-
1990
- 1990-05-25 KR KR1019900007615A patent/KR930009380B1/en not_active IP Right Cessation
- 1990-05-28 JP JP2137385A patent/JPH0374215A/en active Pending
- 1990-05-29 GB GB9011973A patent/GB2234211B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0001009A1 (en) * | 1977-08-22 | 1979-03-07 | Spring Hill Laboratories, Inc. | A vehicle suspension system |
| EP0167159A2 (en) * | 1984-07-04 | 1986-01-08 | Nissan Motor Co., Ltd. | Automotive suspension control system ensuring riding comfort and driving stability, and especially riding comfort on undulating roads |
| EP0227343A1 (en) * | 1985-12-16 | 1987-07-01 | Ford Motor Company Limited | Control system for an adjustable suspension |
| GB2211154A (en) * | 1987-10-15 | 1989-06-28 | Mitsubishi Motors Corp | Anti-dive vehicle suspension apparatus |
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2279425A (en) * | 1991-01-31 | 1995-01-04 | Fichtel & Sachs Ag | Controlling a vibration damper |
| GB2279425B (en) * | 1991-01-31 | 1995-08-16 | Fichtel & Sachs Ag | Process and arrangement for controlling a vibration damper |
| US5485417A (en) * | 1991-01-31 | 1996-01-16 | Fichtel & Sachs Ag | Process and arrangement for controlling a vibration damper |
| EP0780748A2 (en) * | 1992-02-17 | 1997-06-25 | Hitachi, Ltd. | A controller for controlling a moving object, a method of controlling that object, and a sensor for use in such a controller |
| EP0780748B1 (en) * | 1992-02-17 | 2002-11-13 | Hitachi, Ltd. | A controller for controlling a moving object, a method of controlling that object, and a sensor for use in such a controller |
| GB2282784A (en) * | 1993-10-08 | 1995-04-19 | Acg France | Vehicle suspension system |
| US6282471B1 (en) | 1998-06-09 | 2001-08-28 | Land Rover Group Limited | Vehicle roll control |
| US11577705B2 (en) | 2004-10-05 | 2023-02-14 | VisionWorks IP Corporation | Absolute acceleration sensor for use within moving vehicles |
| US11332071B2 (en) | 2004-10-05 | 2022-05-17 | Vision Works Ip Corporation | Absolute acceleration sensor for use within moving vehicles |
| US11400785B2 (en) | 2012-11-07 | 2022-08-02 | Polaris Industries Inc. | Vehicle having suspension with continuous damping control |
| US11400787B2 (en) | 2012-11-07 | 2022-08-02 | Polaris Industries Inc. | Vehicle having suspension with continuous damping control |
| US11400784B2 (en) | 2012-11-07 | 2022-08-02 | Polaris Industries Inc. | Vehicle having suspension with continuous damping control |
| US11400786B2 (en) | 2012-11-07 | 2022-08-02 | Polaris Industries Inc. | Vehicle having suspension with continuous damping control |
| US11407357B2 (en) | 2013-08-28 | 2022-08-09 | Vision Works Ip Corporation | Absolute acceleration sensor for use within moving vehicles |
| US11919524B2 (en) | 2014-10-31 | 2024-03-05 | Polaris Industries Inc. | System and method for controlling a vehicle |
| US11285964B2 (en) | 2014-10-31 | 2022-03-29 | Polaris Industries Inc. | System and method for controlling a vehicle |
| US11963064B2 (en) | 2016-02-10 | 2024-04-16 | Polaris Industries Inc. | Recreational vehicle group management system |
| US11878678B2 (en) | 2016-11-18 | 2024-01-23 | Polaris Industries Inc. | Vehicle having adjustable suspension |
| US11479075B2 (en) | 2017-06-09 | 2022-10-25 | Polaris Industries Inc. | Adjustable vehicle suspension system |
| US11912096B2 (en) | 2017-06-09 | 2024-02-27 | Polaris Industries Inc. | Adjustable vehicle suspension system |
| US11884117B2 (en) | 2018-11-21 | 2024-01-30 | Polaris Industries Inc. | Vehicle having adjustable compression and rebound damping |
| US11904648B2 (en) | 2020-07-17 | 2024-02-20 | Polaris Industries Inc. | Adjustable suspensions and vehicle operation for off-road recreational vehicles |
| US11970036B2 (en) | 2022-06-27 | 2024-04-30 | Polaris Industries Inc. | Vehicle having suspension with continuous damping control |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0374215A (en) | 1991-03-28 |
| GB9011973D0 (en) | 1990-07-18 |
| KR930009380B1 (en) | 1993-10-02 |
| GB2234211B (en) | 1993-11-10 |
| KR900017819A (en) | 1990-12-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20020529 |