CA1153081A - Condition indicating device for wheeled vehicle shock absorbers - Google Patents
Condition indicating device for wheeled vehicle shock absorbersInfo
- Publication number
- CA1153081A CA1153081A CA000351068A CA351068A CA1153081A CA 1153081 A CA1153081 A CA 1153081A CA 000351068 A CA000351068 A CA 000351068A CA 351068 A CA351068 A CA 351068A CA 1153081 A CA1153081 A CA 1153081A
- Authority
- CA
- Canada
- Prior art keywords
- signal
- damping
- accelerometer
- shock absorber
- indication
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D66/02—Apparatus for indicating wear
- F16D66/021—Apparatus for indicating wear using electrical detection or indication means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q9/00—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/58—Combined or convertible systems
- B60T13/585—Combined or convertible systems comprising friction brakes and retarders
- B60T13/586—Combined or convertible systems comprising friction brakes and retarders the retarders being of the electric type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/173—Eliminating or reducing the effect of unwanted signals, e.g. due to vibrations or electrical noise
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
- G01M17/04—Suspension or damping
Abstract
Abstract The invention relates to a device for indicating the condition of shock absorbers of wheeled vehicles. According to the in-vention, an accelerometer (G) is attached on the spring susp-ension (U) of the wheel (H) in question and capable upon pass-ing of the vehicle over road irregularities to emit a decaying A.C. signal (S) with information on the oscillations of the axle (A) and the damping of the tyre. After integration in an integrator (I) the signal is a measure of the difference betw-een the damping of the shock absorber at expansion and at com-pression. This signal is compared in a comparator (K) with a reference signal (Vref) for the permissible damping difference and results in alarm (L) upon achieving said difference.
Description
~3(~8~.
Condition indicating device for wheeled vehicle shock absorbers This invention relates to a device for indicating the conditi-on of shock absorbers of wheeled vehicles by using an acceler-ation-sensitive means, which is rigidly attached near the shock absorber and emits a signal resulting in indication when a pre-determined acceleration value has been exceeded.
When designing shoc~ absorbers, they are to be dimensioned so as to yield maximum damping without causing the tyres a-t upward motion to loose road hold, and so as to damp sufficiently soft-ly to prevent the vehicle from being bumpy at downward motion.
These two criteria imply, that the shock absorber must have prop-erties, which are different for compression and expansion. A
worn absorber more and more loses its capacity of damping oscill-ations. As the absorber works predominantly at compression, the damping for compression consequently decreases relatively rapidly. At a new absorber the difference between the damping at' expansion and at compression is great, but decreases with increasing wear. It was, therefore, desired to obtain a reli-able indication of worn shock absorbers, preferably from ~he driver's seat.
One indication arrangement of the kind referred to above in the introductory portion is known from GB-PS 1 483 231. The acceleration-sensitive means there is located on -the vehicle body in order to be actuated by the mechanic oscillations of the body via the shock absorber. When the maximum amp].itude of the body oscillation - i.e. the first oscillation - at the passing over a distinctive road irregularity exceeds a certain value, the means becomes operative for releasing a signal to an indication circuit. Thus, the influence of the ~,7 ~.~53~
shock absorber on the first body oscillation at road bumps is measured, which renders an unsafe and gross indication.
By the present invention, however, an indication is obtained which is both safe and sensitive, and which is based on meas~
uring the effect of the shock absorber on oscillations, which are generated in the tyre surface proper and transferred to the wheel axle. In accordance therewith, the present invention is characterized in that the acceleration-sensitive means~e~-si~t~_o~ an accelerometer, preferably a piezoelectric element, which is rigidly attached adjacent the wheel hub and continu-ously measures the oscillations of the wheel axle and emits a correspondingly varying electric signal to an integrator, the output signal of which is compared in a comparator with a reference signal corresponding to the predetermined acceler-ation value, in order upon achievement thereof to release in-dication, for example lighting-up of an alarm lamp.
The invention is described in greater detail in the following, with reference to the accompanying drawing, in which an embodi-ment of the arrangement of the invention for indicating worn shock absorbers is illustrated.
In the drawing, a car wheel H with axle A and stationary spring suspension means U and absorber spring indicated at D is shown.
The wheel load, and therewith the damping, being approximately symmetric, it is considered sufficient to carry out the measur-ing of the absorber behaviour at a single one of the four wheels.
According to circumstances~ however, it may be motivated to measure at several wheels by using identically alike measuring arrangements.
For the indication of the absorber wear, a measure of the afore-said difference between the damping at expansion and at compress-ion can be obtained by measuring the oscillation of the axle, in order to obtain the difference between rising and dropping speed. The axle oscillation is a measure of oscillations gener-3Q~
ated in the tyre surface and depending on the tyre properties~damping and natural oscillation frequency) when the vehicle passes over road irregularities. For measuring the axle oscill-ations influenced also by the shoc~ absorber, an acceleration transducer G, a so-called accelerometer, is attached to the wheel suspension U. Sa~d accelerometer may be a piezoelectric quartz element, which ~ the embodiment shown is mounted fac-ing upward on the wheel suspension U, and at its free end supports a metal plate. When the base point of the piezoelect-ric ele~ent is accelerated at the passing of the vehicle over road irregularities~ the point motion is transferred vertic-ally via the piezoelectric element to said plate. The mass inertia of the plate opposes the acceleration motion ana there-by momentarily compresses the element. The piezoelectric effect thereof results in a measurable current impulse S, which is proportional to its compression caused by the road bumps via the tyre~ axle and absorber spring, and the amplitude of which decays due to the damping of the axle oscillation.
The output signal S of the transducer (piezoelectric element) G is passed to a low-pass filter LP in order to eliminate dist-urbing shock transients in the signal. The output of the filter LP is connected to the input of an amplifier F, the output of which is connected to the input of an integrator I. The output signal Va therefrom then is a measure of the difference of the absorber and is fed to one input of a comparator K. To the second output thereof a reference voltage Vref is fed which corresponds to an acceptable minimum value of the absorber difference. The reerence voltage Vref is derived from a region of the damping~frequency characteristic of the tyre where the damping is changed little with the variations in the natural oscillation frequency of the tyre, while the output signal Va refers to a region where the frequency dependency of the damp---ing is high. When the signal Va in question has diminished to the reference voltage Vref, i.e. the difference has decreased to the permissible minimum value, the comparator emits an out-put signal to an indicator, for example a lamp L, which prefer-" ~.
3~8~
ably is mounted on the instrument panel of the car, in orderto warn the driver on the poor condition of the shock absorb-er.
The invention is not restricted to the embodiment described above, but a great number of different modifications can be imagined within the scope of the invention. It is especially possible to use a separa~e voltage source for generating the reference voltage Vref~ instead of deriving it from the tyre characteristic. Furthermore, instead of utilizing the reduct-ion of the signal to the comparator down to the reference voltage for indication, the increase of the signal up to the reference voltage can be utilized. Of course, accelerometers of a kind other than piezoelectric ones can be used.
~ ~
Condition indicating device for wheeled vehicle shock absorbers This invention relates to a device for indicating the conditi-on of shock absorbers of wheeled vehicles by using an acceler-ation-sensitive means, which is rigidly attached near the shock absorber and emits a signal resulting in indication when a pre-determined acceleration value has been exceeded.
When designing shoc~ absorbers, they are to be dimensioned so as to yield maximum damping without causing the tyres a-t upward motion to loose road hold, and so as to damp sufficiently soft-ly to prevent the vehicle from being bumpy at downward motion.
These two criteria imply, that the shock absorber must have prop-erties, which are different for compression and expansion. A
worn absorber more and more loses its capacity of damping oscill-ations. As the absorber works predominantly at compression, the damping for compression consequently decreases relatively rapidly. At a new absorber the difference between the damping at' expansion and at compression is great, but decreases with increasing wear. It was, therefore, desired to obtain a reli-able indication of worn shock absorbers, preferably from ~he driver's seat.
One indication arrangement of the kind referred to above in the introductory portion is known from GB-PS 1 483 231. The acceleration-sensitive means there is located on -the vehicle body in order to be actuated by the mechanic oscillations of the body via the shock absorber. When the maximum amp].itude of the body oscillation - i.e. the first oscillation - at the passing over a distinctive road irregularity exceeds a certain value, the means becomes operative for releasing a signal to an indication circuit. Thus, the influence of the ~,7 ~.~53~
shock absorber on the first body oscillation at road bumps is measured, which renders an unsafe and gross indication.
By the present invention, however, an indication is obtained which is both safe and sensitive, and which is based on meas~
uring the effect of the shock absorber on oscillations, which are generated in the tyre surface proper and transferred to the wheel axle. In accordance therewith, the present invention is characterized in that the acceleration-sensitive means~e~-si~t~_o~ an accelerometer, preferably a piezoelectric element, which is rigidly attached adjacent the wheel hub and continu-ously measures the oscillations of the wheel axle and emits a correspondingly varying electric signal to an integrator, the output signal of which is compared in a comparator with a reference signal corresponding to the predetermined acceler-ation value, in order upon achievement thereof to release in-dication, for example lighting-up of an alarm lamp.
The invention is described in greater detail in the following, with reference to the accompanying drawing, in which an embodi-ment of the arrangement of the invention for indicating worn shock absorbers is illustrated.
In the drawing, a car wheel H with axle A and stationary spring suspension means U and absorber spring indicated at D is shown.
The wheel load, and therewith the damping, being approximately symmetric, it is considered sufficient to carry out the measur-ing of the absorber behaviour at a single one of the four wheels.
According to circumstances~ however, it may be motivated to measure at several wheels by using identically alike measuring arrangements.
For the indication of the absorber wear, a measure of the afore-said difference between the damping at expansion and at compress-ion can be obtained by measuring the oscillation of the axle, in order to obtain the difference between rising and dropping speed. The axle oscillation is a measure of oscillations gener-3Q~
ated in the tyre surface and depending on the tyre properties~damping and natural oscillation frequency) when the vehicle passes over road irregularities. For measuring the axle oscill-ations influenced also by the shoc~ absorber, an acceleration transducer G, a so-called accelerometer, is attached to the wheel suspension U. Sa~d accelerometer may be a piezoelectric quartz element, which ~ the embodiment shown is mounted fac-ing upward on the wheel suspension U, and at its free end supports a metal plate. When the base point of the piezoelect-ric ele~ent is accelerated at the passing of the vehicle over road irregularities~ the point motion is transferred vertic-ally via the piezoelectric element to said plate. The mass inertia of the plate opposes the acceleration motion ana there-by momentarily compresses the element. The piezoelectric effect thereof results in a measurable current impulse S, which is proportional to its compression caused by the road bumps via the tyre~ axle and absorber spring, and the amplitude of which decays due to the damping of the axle oscillation.
The output signal S of the transducer (piezoelectric element) G is passed to a low-pass filter LP in order to eliminate dist-urbing shock transients in the signal. The output of the filter LP is connected to the input of an amplifier F, the output of which is connected to the input of an integrator I. The output signal Va therefrom then is a measure of the difference of the absorber and is fed to one input of a comparator K. To the second output thereof a reference voltage Vref is fed which corresponds to an acceptable minimum value of the absorber difference. The reerence voltage Vref is derived from a region of the damping~frequency characteristic of the tyre where the damping is changed little with the variations in the natural oscillation frequency of the tyre, while the output signal Va refers to a region where the frequency dependency of the damp---ing is high. When the signal Va in question has diminished to the reference voltage Vref, i.e. the difference has decreased to the permissible minimum value, the comparator emits an out-put signal to an indicator, for example a lamp L, which prefer-" ~.
3~8~
ably is mounted on the instrument panel of the car, in orderto warn the driver on the poor condition of the shock absorb-er.
The invention is not restricted to the embodiment described above, but a great number of different modifications can be imagined within the scope of the invention. It is especially possible to use a separa~e voltage source for generating the reference voltage Vref~ instead of deriving it from the tyre characteristic. Furthermore, instead of utilizing the reduct-ion of the signal to the comparator down to the reference voltage for indication, the increase of the signal up to the reference voltage can be utilized. Of course, accelerometers of a kind other than piezoelectric ones can be used.
~ ~
Claims (4)
1. A device for indicating the condition of shock absorbers of wheeled vehicles by using an acceleration-sensitive means, which is rigidly attached on the vehicle near the shock absorber and emits a signal which via an electronic circuit results in an indication when a predetermined acceleration value is exceeded, characterized in that the means includes an accelerometer, which is rigidly attached adjacent the wheel hub for continuously measuring the oscillations of the wheel axle, induced via a shock absorber by vertical irregularities in the road, and emitting correspondingly varying electric signals to an integrator, the output signal of which is compared in a com-parator with a reference signal corresponding to a predetermined unpermissable shock absorber value, in order to, upon reaching the same release an indication, for example lighting up an alarm lamp.
2. A device as defined in claim 1, characterized in that the reference signal is derived from a relatively frequency-in-dependent region of the damping/frequency characteristic of the tire.
3. A device as defined in claim 1 or 2, characterized in that a low-pass filter and an amplifier are inserted between the accelerometer and the integrator.
4. A device as in claim 1 wherein the accelerometer in-cludes a piezoelectric element.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7903814-7 | 1979-05-02 | ||
| SE7903814A SE426379B (en) | 1979-05-02 | 1979-05-02 | DEVICE FOR INDICATING THE CONDITION OF SUVERS IN A WHEEL VEHICLE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1153081A true CA1153081A (en) | 1983-08-30 |
Family
ID=20337948
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000351068A Expired CA1153081A (en) | 1979-05-02 | 1980-05-01 | Condition indicating device for wheeled vehicle shock absorbers |
| CA000351069A Expired CA1154842A (en) | 1979-05-02 | 1980-05-01 | Device for eliminating the vehicle wheel locking risk at braking |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000351069A Expired CA1154842A (en) | 1979-05-02 | 1980-05-01 | Device for eliminating the vehicle wheel locking risk at braking |
Country Status (8)
| Country | Link |
|---|---|
| US (2) | US4317105A (en) |
| EP (2) | EP0018960B1 (en) |
| JP (2) | JPS5622928A (en) |
| BR (2) | BR8002595A (en) |
| CA (2) | CA1153081A (en) |
| DE (2) | DE3063437D1 (en) |
| IN (1) | IN154269B (en) |
| SE (1) | SE426379B (en) |
Families Citing this family (36)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2506014B1 (en) * | 1981-05-14 | 1987-08-21 | Brisard Gerard | ON-BOARD APPARATUS FOR CONTROLLING SUSPENSION SHOCK ABSORBERS |
| US4547771A (en) * | 1982-08-13 | 1985-10-15 | A. W. Chesterton Company | Vibration sensor |
| US4638179A (en) * | 1984-03-31 | 1987-01-20 | Robert Bosch Gmbh | Extended response trigger circuit |
| CN1012301B (en) * | 1984-10-16 | 1991-04-03 | 三洋电机株式会社 | Display apparatus |
| DE3621580C2 (en) * | 1986-06-27 | 1995-06-29 | Bosch Gmbh Robert | Device for triggering occupant protection systems |
| US4744239A (en) * | 1986-11-28 | 1988-05-17 | Caterpillar Inc. | Method for monitoring a work vehicle suspension |
| JPH0814525B2 (en) * | 1986-11-28 | 1996-02-14 | キャタピラー インコーポレーテッド | How to monitor work vehicle suspensions |
| US4887454A (en) * | 1986-11-28 | 1989-12-19 | Caterpillar Inc. | Method for monitoring a work vehicle suspension |
| US4845975A (en) * | 1986-11-28 | 1989-07-11 | Caterpillar Inc. | Method for monitoring a work vehicle suspension |
| DE3714470A1 (en) * | 1987-04-30 | 1988-11-17 | Lehn F Heinrich | METHOD AND DEVICE FOR MONITORING VIBRATION EXPLORERS IN CHASSIS COMPONENTS IN MOTOR VEHICLES DURING DRIVING |
| US5396973A (en) * | 1991-11-15 | 1995-03-14 | Lord Corporation | Variable shock absorber with integrated controller, actuator and sensors |
| US5301130A (en) * | 1992-10-22 | 1994-04-05 | Hughes Aircraft Company | Absoulte velocity sensor |
| JP3268092B2 (en) * | 1993-11-15 | 2002-03-25 | 本田技研工業株式会社 | Vehicle road simulator |
| JP3391157B2 (en) * | 1994-11-02 | 2003-03-31 | 株式会社デンソー | Braking force control device |
| DE4440413A1 (en) * | 1994-11-11 | 1996-05-15 | Fichtel & Sachs Ag | Monitoring system for determining efficiency of esp. motor vehicle shock absorber |
| US5586669A (en) * | 1995-05-03 | 1996-12-24 | Fm Industries, Inc. | Cushioning unit fault detector |
| ATE315219T1 (en) * | 1999-05-19 | 2006-02-15 | Vibro Meter Ag | METHOD AND ARRANGEMENT FOR COMBINED VIBRATION MEASUREMENT |
| US7334717B2 (en) | 2001-10-05 | 2008-02-26 | Tyco Healthcare Group Lp | Surgical fastener applying apparatus |
| JP4245480B2 (en) * | 2001-10-05 | 2009-03-25 | タイコ ヘルスケア グループ エルピー | Surgical stapling apparatus and method |
| US7238195B2 (en) * | 2002-05-10 | 2007-07-03 | Tyco Healthcare Group Lp | Wound closure material applicator and stapler |
| WO2004048134A2 (en) * | 2002-11-26 | 2004-06-10 | Shock-Doc Ltd | Monitoring of shock absorbers |
| US7296722B2 (en) | 2003-10-17 | 2007-11-20 | Tyco Healthcare Group Lp | Surgical fastener applying apparatus with controlled beam deflection |
| JP4543908B2 (en) | 2004-12-07 | 2010-09-15 | 日産自動車株式会社 | VEHICLE DRIVE OPERATION ASSISTANCE DEVICE AND VEHICLE HAVING VEHICLE DRIVE OPERATION ASSISTANCE DEVICE |
| DE102006040676B3 (en) * | 2006-08-30 | 2008-03-27 | Ab Skf | Road vehicle, namely passenger cars or lorries |
| US8616351B2 (en) | 2009-10-06 | 2013-12-31 | Tenneco Automotive Operating Company Inc. | Damper with digital valve |
| DE102010016587A1 (en) | 2010-04-22 | 2011-10-27 | Ipetronik Gmbh & Co. Kg | wheelset |
| US9217483B2 (en) | 2013-02-28 | 2015-12-22 | Tenneco Automotive Operating Company Inc. | Valve switching controls for adjustable damper |
| US9399383B2 (en) | 2013-02-28 | 2016-07-26 | Tenneco Automotive Operating Company Inc. | Damper with integrated electronics |
| US9884533B2 (en) | 2013-02-28 | 2018-02-06 | Tenneco Automotive Operating Company Inc. | Autonomous control damper |
| US9879748B2 (en) | 2013-03-15 | 2018-01-30 | Tenneco Automotive Operating Company Inc. | Two position valve with face seal and pressure relief port |
| US9879746B2 (en) | 2013-03-15 | 2018-01-30 | Tenneco Automotive Operating Company Inc. | Rod guide system and method with multiple solenoid valve cartridges and multiple pressure regulated valve assemblies |
| US10559138B2 (en) * | 2015-12-18 | 2020-02-11 | Ge Global Sourcing Llc | Sensor signal processing system and method |
| JP6547793B2 (en) * | 2016-08-12 | 2019-07-24 | 株式会社デンソー | Tire mount sensor, diagnosis history storage device and diagnosis notification device |
| US10479160B2 (en) | 2017-06-06 | 2019-11-19 | Tenneco Automotive Operating Company Inc. | Damper with printed circuit board carrier |
| US10588233B2 (en) | 2017-06-06 | 2020-03-10 | Tenneco Automotive Operating Company Inc. | Damper with printed circuit board carrier |
| CN111386203B (en) * | 2017-11-28 | 2023-05-23 | 沃尔沃卡车集团 | Method for determining the functional state of a vehicle shock absorber device |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1378958A (en) * | 1963-09-30 | 1964-11-20 | Hispano Suiza Sa | Improvements to braking devices for aerodyne landing gears, in particular to those with hydraulic servo control |
| US3383909A (en) * | 1965-09-10 | 1968-05-21 | Union Oil Co | Dynamic shock absorber tester and method |
| US3455149A (en) * | 1966-01-20 | 1969-07-15 | Reliance Electric & Eng Co | Vibration amplitude monitor |
| US3544172A (en) * | 1968-12-16 | 1970-12-01 | Bendix Corp | Adaptive braking system false trigger hold-off circuit |
| US3681976A (en) * | 1970-06-29 | 1972-08-08 | Gen Electric | Free and loose object detection system |
| US3743361A (en) * | 1971-08-13 | 1973-07-03 | Diamond Squared Ind Inc | Anti-skid system and method |
| US3744321A (en) * | 1971-12-16 | 1973-07-10 | J Hauge | Rotating body unbalance detector-locator |
| SE370906B (en) * | 1973-03-09 | 1974-11-04 | Asea Ab | |
| DE2334737A1 (en) * | 1973-07-09 | 1975-04-03 | Volkswagenwerk Ag | PROCEDURE FOR TESTING THE WORKABILITY OF SHOCK ABSORBERS |
| JPS5079688A (en) * | 1973-11-24 | 1975-06-28 | ||
| US3921945A (en) * | 1974-07-25 | 1975-11-25 | Us Navy | Train resonant car-body rocking detector system |
| US3923345A (en) * | 1974-10-03 | 1975-12-02 | Joseph Louis Poggie | Anti-skid braking system with torque sensing means |
| US4085349A (en) * | 1976-03-12 | 1978-04-18 | Ird Mechanalysis, Inc. | Piezo electric transducer for measuring instantaneous vibration velocity |
| DE2713640A1 (en) * | 1977-03-28 | 1978-10-12 | Kraftwerk Union Ag | PROCEDURE FOR MONITORING A PLANT AND ARRANGEMENT FOR IMPLEMENTING THE PROCEDURE |
-
1979
- 1979-05-02 SE SE7903814A patent/SE426379B/en not_active IP Right Cessation
-
1980
- 1980-04-28 BR BR8002595A patent/BR8002595A/en unknown
- 1980-04-28 BR BR8002594A patent/BR8002594A/en unknown
- 1980-04-29 DE DE8080850064T patent/DE3063437D1/en not_active Expired
- 1980-04-29 EP EP80850065A patent/EP0018960B1/en not_active Expired
- 1980-04-29 EP EP80850064A patent/EP0018959B1/en not_active Expired
- 1980-04-29 DE DE8080850065T patent/DE3071848D1/en not_active Expired
- 1980-04-30 US US06/144,971 patent/US4317105A/en not_active Expired - Lifetime
- 1980-04-30 US US06/145,213 patent/US4333146A/en not_active Expired - Lifetime
- 1980-05-01 CA CA000351068A patent/CA1153081A/en not_active Expired
- 1980-05-01 CA CA000351069A patent/CA1154842A/en not_active Expired
- 1980-05-02 JP JP5933380A patent/JPS5622928A/en active Granted
- 1980-05-02 JP JP5933480A patent/JPS5621943A/en active Granted
-
1981
- 1981-05-01 IN IN457/CAL/81A patent/IN154269B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP0018959B1 (en) | 1983-05-25 |
| DE3063437D1 (en) | 1983-07-07 |
| US4317105A (en) | 1982-02-23 |
| IN154269B (en) | 1984-10-13 |
| BR8002595A (en) | 1980-12-09 |
| EP0018959A1 (en) | 1980-11-12 |
| JPS5622928A (en) | 1981-03-04 |
| SE7903814L (en) | 1980-11-03 |
| CA1154842A (en) | 1983-10-04 |
| JPS5621943A (en) | 1981-02-28 |
| BR8002594A (en) | 1980-12-09 |
| DE3071848D1 (en) | 1987-01-15 |
| SE426379B (en) | 1983-01-17 |
| EP0018960A2 (en) | 1980-11-12 |
| JPH0224334B2 (en) | 1990-05-29 |
| US4333146A (en) | 1982-06-01 |
| JPH0134820B2 (en) | 1989-07-21 |
| EP0018960A3 (en) | 1983-02-23 |
| EP0018960B1 (en) | 1986-12-03 |
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