US6754571B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of magnetorheological engine mount
Assignee: BWI Co Ltd SA
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Filing: 2001-07-30
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Granted: 2004-06-22
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Expires: 2021-07-30
Abstract
Abstract A system and method of controlling engine vibration mounted within a vehicle including at least one hydraulic mount, each mount including a fluid chamber. A pair of accelerometers sense relative acceleration across the mount between the engine and the frame and generate a relative acceleration signal. A control unit is electrically connected to the accelerometers. The control unit is adapted to generate an electronic control signal in response to the relative acceleration signal. The control device is responsive to the electric control signal for controlling the damping force of the hydraulic mount. A control algorithm calibrates the control unit such that maximum vibration damping occurs at and around the engine resonance bounce frequency.
Inventors
- 👤 Prasad V. Gade
- 👤 Sanjiv G. Tewani
- 👤 Thomas A. Baudendistel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:00
CPC Classifications
F; F16; F16F; F16F13/00; F16F13/04; F16F13/26; F16F13/30; F16F13/305; F16F2230/00; F16F2230/18
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
102 words
A method of controlling a hydraulic mount of a engine comprising: calibrating at least one tunable parameter of a control system of the mount based on an engine bounce resonant frequency; generating a first acceleration signal; generating a second acceleration signal; determining a relative acceleration across the mount based on the first and second acceleration signals; generating a control signal responsive to the determined relative acceleration based on the at least one tunable parameter; and controlling the flow of MR mount fluid in the mount responsive to the control signal such that maximum vibration damping occurs at a predetermined band of frequencies.
Claim 2
Independent Claim
102 words
A method of controlling a hydraulic mount of a engine comprising: calibrating at least one tunable parameter of a control system of the mount based on an engine bounce resonant frequency; generating a first acceleration signal; generating a second acceleration signal; determining a relative acceleration across the mount based on the first and second acceleration signals; generating a control signal responsive to the determined relative acceleration based on the at least one tunable parameter; and controlling the flow of MR mount fluid in the mount responsive to the control signal such that maximum vibration damping occurs at a predetermined band of frequencies.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein the predetermined band of frequencies occurs at and around the resonance bounce frequency of the engine.
Claim 4
Dependent Claim
22 words
The method of claim 2 wherein calibrating at least one tunable parameter comprises tuning an objective function obtained by a sensitivity function.
Claim 5
Dependent Claim
17 words
The method of claim 3 wherein calibrating at least one tunable parameter comprises tuning a weighting function.
Claim 6
Dependent Claim
16 words
The method of claim 4 wherein the weighting function is limited to the resonance bounce frequency.
Claim 7
Dependent Claim
18 words
The method of claim 5 wherein calibrating at least one tunable parameter comprises tuning an associated scalable factor.
Claim 8
Dependent Claim
22 words
The method of claim 6 wherein the associated scalable factor is used to increase and decrease the magnitude of the weighting function.
Claim 9
Independent Claim
129 words
A system for controlling a hydraulic vibration damping engine mount for a vehicle comprising: at least one mount, each mount defining a fluid chamber; means for sensing relative acceleration across each mount; a tunable control device operably connected to the sensing means for generating a control signal based on the sensed relative acceleration and maximized at a predetermined band of frequencies; and a coil member positioned adjacent to the mount, the coil member operably connected to the control device for generating a magnetic field in the fluid chamber based on the control signal; wherein the sensing means is a pair of accelerometers positioned such that a first accelerometer is placed on an engine of the vehicle and a second accelerometer is placed on a frame member of the vehicle.
Claim 10
Independent Claim
129 words
A system for controlling a hydraulic vibration damping engine mount for a vehicle comprising: at least one mount, each mount defining a fluid chamber; means for sensing relative acceleration across each mount; a tunable control device operably connected to the sensing means for generating a control signal based on the sensed relative acceleration and maximized at a predetermined band of frequencies; and a coil member positioned adjacent to the mount, the coil member operably connected to the control device for generating a magnetic field in the fluid chamber based on the control signal; wherein the sensing means is a pair of accelerometers positioned such that a first accelerometer is placed on an engine of the vehicle and a second accelerometer is placed on a frame member of the vehicle.
Claim 11
Dependent Claim
18 words
The system of claim 8 wherein the at least one mount includes a first and a second mount.
Claim 12
Dependent Claim
24 words
The system of claim 9 wherein the first and second mounts are placed between the engine and the frame in a spaced apart configuration.
Claim 13
Dependent Claim
13 words
The system of claim 8 wherein the mount includes a magnetorheological mount fluid.
Claim 14
Dependent Claim
25 words
The system of claim 11 wherein the coil is positioned to control the flow of magnetorheological fluid between upper and lower chambers of each mount.
Claim 15
Dependent Claim
31 words
The system of claim 12 wherein the coil includes an annular coil positioned adjacent at least one passageway through a plate, the plate being positioned between the upper and lower chambers.
Claim 16
Dependent Claim
28 words
The system of claim 13 wherein the coil is adapted to impart an increased shear resistance to the magnetorheological fluid when a current is passed through the coil.
Claim 17
Independent Claim
112 words
A system for controlling a hydraulic mount of a engine comprising: means for modifying at least one tunable parameter of a control system of the mount based on an engine bounce resonant frequency; means for generating a first acceleration signal; means for generating a second acceleration signal; means for calculating a relative acceleration across the mount based on the first and second acceleration signals; means for generating a control signal responsive to the relative acceleration based on the at least one tunable parameter; and means for controlling the flow of MR fluid in the mount responsive to the control signal such that maximum vibration damping occurs at a predetermined band of frequencies.
Claim 18
Independent Claim
112 words
A system for controlling a hydraulic mount of a engine comprising: means for modifying at least one tunable parameter of a control system of the mount based on an engine bounce resonant frequency; means for generating a first acceleration signal; means for generating a second acceleration signal; means for calculating a relative acceleration across the mount based on the first and second acceleration signals; means for generating a control signal responsive to the relative acceleration based on the at least one tunable parameter; and means for controlling the flow of MR fluid in the mount responsive to the control signal such that maximum vibration damping occurs at a predetermined band of frequencies.
Claim 19
Dependent Claim
22 words
The system of claim 15 wherein the predetermined band of frequencies occurs at and around the resonance bounce frequency of the engine.
Claim 20
Dependent Claim
24 words
The system of claim 16 wherein the means for tuning at least one tunable parameter comprises an objective function obtained by a sensitivity function.
Claim 21
Dependent Claim
19 words
The system of claim 17 wherein the means for tuning at least one tunable parameter comprises a weighting function.
Claim 22
Dependent Claim
16 words
The system of claim 18 wherein the weighting function is based on the resonance bounce frequency.
Claim 23
Dependent Claim
20 words
The system of claim 19 wherein the means for tuning at least one tunable parameter comprises an associated scalable factor.
Claim 24
Dependent Claim
22 words
The system of claim 20 wherein the associated scalable factor is used to increase and decrease the magnitude of the weighting function.
Claim 25
Dependent Claim
88 words
A control system for a hydraulic mount for a comprising: means for generating a first acceleration signal; means for generating a second acceleration signal; means for determining a relative acceleration across the mount based on the first and second acceleration signals; means for generating a control signal corresponding to the relative acceleration; means for controlling the flow of MR fluid in the mount responsive to the control signal; means for tuning the control system such that maximum vibration damping occurs at and around the engine resonance bounce frequency.
Claim 26
Dependent Claim
88 words
A control system for a hydraulic mount for a comprising: means for generating a first acceleration signal; means for generating a second acceleration signal; means for determining a relative acceleration across the mount based on the first and second acceleration signals; means for generating a control signal corresponding to the relative acceleration; means for controlling the flow of MR fluid in the mount responsive to the control signal; means for tuning the control system such that maximum vibration damping occurs at and around the engine resonance bounce frequency.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2007-06-22 | 2007-12-22 | 2008-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-06-22 | 2011-12-22 | 2012-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-06-22 | 2015-12-22 | 2016-06-22 | $7700.00 | Window Closed / Lapsed |