SYSTEMS AND METHODS FOR DETECTING AND REDUCING HIGH DRIVELINE TORSIONAL LEVELS IN AUTOMOBILE TRANSMISSIONS
First Claim
1. A method to detect and reduce disturbances arising from any high driveline torsional vibration levels in an automobile transmission, comprising:
- measuring one of transmission turbine speed and transmission input speed;
detecting vibration arising from any high driveline torsional vibration levels based on the measured speed; and
controlling slip in a launch device of a transmission responsive to detecting vibrations.
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Abstract
The present disclosure provides systems and methods to detect and reduce any high driveline torsional levels, such as due to the cylinder deactivation in variable displacement system engines or aggressive lock-up strategies for fuel efficiency, in automobile transmissions. The present disclosure utilizes a controller in an automobile to operate a computationally thrifty method for quickly detecting noise and vibration disturbances in the transmission. This quick detection enables fuel economic calibrations that aggressively reduce the disturbances by controlling slip in a launch device of the transmission. As problem disturbances arise, they are detected before occupants notice objectionable behavior. Once detected, the disturbances are reduced, such as by increasing launch device slip, which effectively intercepts the objectionable disturbances before they are transferred through the entire drivetrain. The present disclosure can also apply to launch devices in Dual Clutch Transmissions and Electronically-controlled Manual Transmissions.
87 Citations
20 Claims
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1. A method to detect and reduce disturbances arising from any high driveline torsional vibration levels in an automobile transmission, comprising:
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measuring one of transmission turbine speed and transmission input speed; detecting vibration arising from any high driveline torsional vibration levels based on the measured speed; and controlling slip in a launch device of a transmission responsive to detecting vibrations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A processor-based method to detect and reduce disturbances arising from any high driveline torsional vibration levels in an automobile transmission, comprising:
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measuring N speed samples, h0, . . . , hN−
1, wherein the speed samples comprise one of transmission turbine speed samples and transmission input speed samples, and wherein the samples are substantially spaced in time over Δ
seconds;calculating an average speed of the N speed samples, wherein the average speed comprises one of have=mean (h0, . . . , hN−
1) and have=median (h0, . . . , hN−
1);calculating a frequency value, fV, where vibration is expected, wherein fV=p·
(have+s), where p=2 for an eight-cylinder variable displacement engine, and p=1.5 for a six-cylinder variable displacement engine, and s is launch device slip;calculating a discrete frequency, m, wherein m=round (fVDS/δ
f), and δ
f=1/(Δ
·
N);computing a matrix W, where Wi,j=w(i−
1)(j−
1), i=1, . . . , N/2+1, and j=1, . . . , N, and wherein w=e2m/N;multiplying the (m+1)th row of the matrix by h0, . . . , hN−
1; andsquaring the result of the multiplying step to provide an estimate of frequency power at the discrete frequency. - View Dependent Claims (16, 17, 18, 19)
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20. A controller configured to detect and reduce disturbances arising from any high driveline torsional vibration levels in an automobile transmission, comprising:
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memory comprising an operating system, and a disturbance detection engine; a data store coupled to the memory through a local interface, wherein the data store comprises pre-computed values used by the disturbance detection engine; input/output interfaces coupled to the data store and memory through the local interface, wherein the input/output interfaces are configured to receive one of transmission turbine and transmission input speed measurements and to transmit control information to a transmission; and a processor configured to operate the disturbance detection engine, wherein the disturbance detection engine is configured to; measure one of transmission turbine speed samples and transmission input speed sample substantially spaced in time over Δ
seconds;calculate a frequency value where vibration arising from, any high driveline torsional vibration levels is expected; calculate a discrete frequency value as close as possible to the frequency value; perform a discrete-time Fourier transform at the discrete frequency value; compare the power at the discrete frequency value to a threshold value to determine if disturbances are present; and control a launch device in the transmission responsive to the detection of disturbances.
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Specification