Patent US2734707A successfully refreshed from Google Patents.
Patent EP0322911A2 successfully refreshed from Google Patents.
EP0322911A2
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EP
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Wheel reference velocity calculation apparatus
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1988-12-29
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Granted: —
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Expires: 2008-12-29
Abstract
Abstract A reference wheel velocity (Vr) calculation apparatus for use in an automotive vehicle includes a device (1a, 1b, 1c, 1d) for sampling actual wheel velocities detected at a predetermined sampling cycle, a device (2) to select a suitable velocity (Vm) as the basis for the calculation of reference wheel velocity, and a calculator (3, 4) for calculating an intermediate reference velocity (Vi) of the present sampling point from the selected wheel velocity (Vm) by suppressing the variance of intermediate reference velocity within predetermined limit(s) (Dv). Further, a greater one of the presently sampled selected wheel velocity (Vm) and a calculated intermediate reference velocity (Vi) is selected as a quasi-reference wheel velocity (Vt) which is then smoothed according to index (A) to obtain the reference wheel velocity (Vr). The limit of the variance (Dv) may be changed in regard to the accelerometer provided in the vehicle. Also, the smoothing index (A) may be changed with respect to the factors such as the behavior of the wheel velocity (Vm).
Inventors
- 👤 Koji C/O Itami Works Takata
- 👤 Tatuji c/o Itami Works Matumoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 21:22
CPC Classifications
G; G01; G01P; G01P11/00; B; B60; B60T; B60T8/00; B60T8/17; B60T8/172; B60T2250/00; B60T2250/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
144 words
A reference wheel velocity (Vr) calculation apparatus for use in an automotive vehicle comprising: means (1a, 1b, 1c, 1d) for sampling actual wheel velocities of each wheel detected at a predetermined sampling cycle; means (2) for selecting a selected wheel velocity (Vm) from the plurality of actual wheel velocities; means (3, 4) for calculating an intermediate reference velocity (Vi) from the selected wheel velocity Vm by suppressing the variance of intermediate reference velocity within predetermined limit(s) (Dv); means (5) for setting a quasi-reference wheel velocity (Vt) which is the greater one of the presently sampled selected wheel velocity (Vm) and the calculated intermediate reference velocity (Vi); means (7) for setting an index (A) based on the behavior of selected wheel velocity (Vm); and means (6, 8) for computing the reference wheel velocity (Vr) by smoothing the quasi-reference wheel velocity (Vt) according to index A.
Claim 2
Dependent Claim
144 words
A reference wheel velocity (Vr) calculation apparatus for use in an automotive vehicle comprising: means (1a, 1b, 1c, 1d) for sampling actual wheel velocities of each wheel detected at a predetermined sampling cycle; means (2) for selecting a selected wheel velocity (Vm) from the plurality of actual wheel velocities; means (3, 4) for calculating an intermediate reference velocity (Vi) from the selected wheel velocity Vm by suppressing the variance of intermediate reference velocity within predetermined limit(s) (Dv); means (5) for setting a quasi-reference wheel velocity (Vt) which is the greater one of the presently sampled selected wheel velocity (Vm) and the calculated intermediate reference velocity (Vi); means (7) for setting an index (A) based on the behavior of selected wheel velocity (Vm); and means (6, 8) for computing the reference wheel velocity (Vr) by smoothing the quasi-reference wheel velocity (Vt) according to index A.
Claim 3
Dependent Claim
38 words
A reference wheel velocity (Vr) calculation apparatus as claimed in claim 1, further comprising means for obtaining an acceleration of the vehicle and, wherein said predetermined limit(s) of variance (Dv) is varied based on the obtained vehicle acceleration.
Claim 4
Dependent Claim
52 words
A reference wheel velocity (Vr) calculation apparatus as claimed in claim 1 or 2, wherein said predetermined limit(s) of variance (Dv) is set for each of lower end (Dv₁) and upper end (Dv₂) and lower limit of variance (Dv₁) is equal to the maximum possible deceleration for the vehicle at that moment.
Claim 5
Dependent Claim
88 words
A reference wheel velocity (Vr) calculation apparatus as claimed in claim 1, 2, or 3, wherein said computing means (6, 8) computes the reference wheel velocity (Vr) by the following equation: Vr i = Vr i-1 + A(Vt i - Vr i-1 ) 0 < A < 1.0 wherein Vr i and Vr i-1 are reference wheel velocity obtained in the present and previous cycles, respectively, Vt i is the quasi-reference wheel velocity obtained in the present cycle and A is the index set by setting means (7).
Claim 6
Dependent Claim
54 words
A reference wheel velocity (Vr) calculation apparatus as claimed in claim 4, wherein a value of said index A is set higher when the difference between said reference wheel velocity (Vr) and said selected wheel velocity (Vm) is on an increasing trend, and is set lower when said difference is on a decreasing trend.
Claim 7
Dependent Claim
54 words
A reference wheel velocity (Vr) calculation apparatus as claimed in claim 4, wherein a value of said index A is set lower when said reference wheel velocity (Vr) is greater than said quasi-reference wheel velocity (Vt), and is set higher when said reference wheel velocity (Vr) is lower than said quasi-reference wheel velocity (Vt).
Claim 8
Dependent Claim
37 words
A reference wheel velocity (Vr) calculation apparatus as claimed in claim 4, further comprising means for obtaining an acceleration of the vehicle and, wherein a value of said index A is set variably according to vehicle acceleration.
Claim 9
Dependent Claim
23 words
A reference wheel velocity (Vr) calculation apparatus as claimed in claim 7, wherein said vehicle acceleration (Ar) is calculated from the following equation:
Claim 10
Dependent Claim
44 words
A reference wheel velocity (Vr) calculation apparatus as claimed in claim 8, wherein said reference wheel velocity (Vr) is used for an antilock brake control system, and wherein a value of said index B is set higher during non-antilock braking than during antilock braking.
References Cited (Backward Citations)
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