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EP0262602A2
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EP
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In-gear vibration elimination system
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1987-09-25
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Granted: —
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Expires: 2007-09-25
Abstract
Abstract An in-gear vibration elimination system provided in a vehicle includes a detector (1a, 1b) for detecting a speed of a drive wheel, a speed of a non-drive wheel, and a speed of a vehicle. An antiskid control and/or a brake traction control (4, 18) is provided for detecting a deviation of the wheel speed from the vehicle speed. When the speed of the wheel deviates from the speed of the vehicle, a wheel speed control (18) is operated to control the speed of the wheel to become nearly equal to the vehicle speed. A differential circuit (2) is provided for taking a second order differential of the drive wheel speed, which is compared with a reference level. When second order differential exceeds over the reference level, indicating that the in-gear vibration is present, the operation of the wheel speed control (18) is interrupted to eliminate the in-gear vibration caused by the wheel speed control (18).
Inventors
- 👤 Hideaki C/O Itami Works Of Sumitomo Fujioka
- 👤 Koji C/O Itami Works Of Sumitomo Takata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 18:28
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/17; B60T8/175; B60T8/173; B60T2270/00; B60T2270/20; B60T2270/206
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
64 words
A method for detecting an in-gear vibration of a vehicle comprising the steps of: detecting a speed of a drive wheel; taking a second order differential of said drive wheel speed; producing a reference level; and comparing said second order differential with said reference level and producing a signal indicative of the in-gear vibration when said second order differential exceeds over said reference level.
Claim 2
Independent Claim
64 words
A method for detecting an in-gear vibration of a vehicle comprising the steps of: detecting a speed of a drive wheel; taking a second order differential of said drive wheel speed; producing a reference level; and comparing said second order differential with said reference level and producing a signal indicative of the in-gear vibration when said second order differential exceeds over said reference level.
Claim 3
Dependent Claim
67 words
An in-gear vibration detector mounted in a vehicle comprising: means (1a) for detecting a speed of a drive wheel; means (2) for taking a differential of said drive wheel speed; means (15) for producing a reference level; and means (16) for comparing said differential with said reference level and for producing an in-gear signal indicative of the in-gear vibration when said differential exceeds over said reference level.
Claim 4
Dependent Claim
67 words
An in-gear vibration detector mounted in a vehicle comprising: means (1a) for detecting a speed of a drive wheel; means (2) for taking a differential of said drive wheel speed; means (15) for producing a reference level; and means (16) for comparing said differential with said reference level and for producing an in-gear signal indicative of the in-gear vibration when said differential exceeds over said reference level.
Claim 5
Dependent Claim
25 words
An in-gear vibration detector as claimed in claim 2, wherein said differential taking means (2) takes a second order differential of said drive wheel speed.
Claim 6
Dependent Claim
19 words
An in-gear vibration detector as claimed in claim 2, wherein said producing means (15) produces a constant reference level.
Claim 7
Dependent Claim
30 words
An in-gear vibration detector as claimed in claim 2, wherein said producing means (15) produces a reference level which is variable with re- .spect to an acceleration of the vehicle.
Claim 8
Dependent Claim
45 words
An in-gear vibration detector as claimed in claim 2, wherein said producing means (15) comprises means for detecting a vertical acceleration of the vehicle, means for taking an average of the vertial acceleration, and means for adding the average to said a predetermined reference value.
Claim 9
Dependent Claim
31 words
An in-gear vibration detector as claimed in claim 2, wherein said producing means (15) produces first reference level in a positive region and a second reference level in a negative region.
Claim 10
Dependent Claim
33 words
An in-gear vibration detector as claimed in claim 2, wherein said comparing means (16) produces said in-gear signal indicative of the in-gear vibration when said differential exceeds over said reference level twice sequentially.
Claim 11
Dependent Claim
173 words
An in-gear vibration elimination system provided in a vehicle comprising: means (1 a) for detecting a speed of a drive wheel; means (16) for detecting a speed of a non-drive wheel; means (3) for detecting a speed of a vehicle; means (4) for detecting a deviation of the wheel speed from the vehicle speed; wheel speed control means (18) for controlling the speed of the wheel to become nearly equal to the vehicle speed when said deviation detecting means detects that the speed of the wheel deviates from the speed of the vehicle; means (2) for taking a differential of said drive wheel speed; means (15) for producing a reference level; means (16) for comparing said differential with said reference level and for producing an in-gear signal indicative of the in-gear vibration when said differential exceeds over said reference level; and interrupting means (17) for interrupting the operation of said wheel speed control means in respone to said in-gear signal, thereby eliminating the in-gear vibration caused by said wheel speed control means (18).
Claim 12
Dependent Claim
173 words
An in-gear vibration elimination system provided in a vehicle comprising: means (1 a) for detecting a speed of a drive wheel; means (16) for detecting a speed of a non-drive wheel; means (3) for detecting a speed of a vehicle; means (4) for detecting a deviation of the wheel speed from the vehicle speed; wheel speed control means (18) for controlling the speed of the wheel to become nearly equal to the vehicle speed when said deviation detecting means detects that the speed of the wheel deviates from the speed of the vehicle; means (2) for taking a differential of said drive wheel speed; means (15) for producing a reference level; means (16) for comparing said differential with said reference level and for producing an in-gear signal indicative of the in-gear vibration when said differential exceeds over said reference level; and interrupting means (17) for interrupting the operation of said wheel speed control means in respone to said in-gear signal, thereby eliminating the in-gear vibration caused by said wheel speed control means (18).
Claim 13
Dependent Claim
26 words
An in-gear vibration elimination system as claimed in claim 9, wherein said differential taking means (2) takes a second order differential of said drive wheel speed.
Claim 14
Dependent Claim
20 words
An in-gear vibration elimination system as claimed in claim 9, wherein said producing means (15) produces a constant reference signal.
Claim 15
Dependent Claim
30 words
An in-gear vibration elimination system as claimed in claim 9, wherein said producing means (15) produces a reference level which is variable with respect to an acceleration of the vehicle.
Claim 16
Dependent Claim
46 words
An in-gear vibration elimination system as claimed in claim 9, wherein said producing means (15) comprises means for detecting a vertical acceleration of the vehicle, means for taking an average of the vertical acceleration, and means for adding the average to said a predetermined reference value.
Claim 17
Dependent Claim
32 words
An in-gear vibration elimination system as claimed in claim 9, wherein said producing means (15) produces first reference level in a positive region and a second reference level in a negative region.
Claim 18
Dependent Claim
34 words
An in-gear vibration elimination system as claimed in claim 9, wherein said comparing means (16) produces said in-gear signal indicative of the in-gear vibration when said differential exceeds over said reference level twice sequentially.
Claim 19
Dependent Claim
22 words
An in-gear vibration elimination system as claimed in claim 9, wherein said wheel speed control means (18) is an antiskid control means.
Claim 20
Dependent Claim
23 words
An in-gear vibration elimination system as claimed in claim 9, wherein said wheel speed control means (18) is a brake traction control means.
Claim 21
Dependent Claim
27 words
An in-gear vibration elimination system as claimed in claim 9, wherein said wheel speed control means (18) controls the wheel speed by a brake pressure change signal.
Claim 22
Dependent Claim
35 words
An in-gear vibration elimination system as claimed in claim 18, wherein said interrupting means (17) interrupts said wheel speed control means (18) by maintaining the brake pressure constant regardless of said brake pressure change signal.
References Cited (Backward Citations)
No citation records indexed.
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