Patent US6493744B1 successfully refreshed from Google Patents.
EP0127082A2
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Control device for vehicular engine continuously variable transmission system
Assignee: Nissan Motor Co Ltd
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Filing: 1984-05-17
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Granted: —
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Expires: 2004-05-17
Abstract
Abstract A deviation of an actual reduction ratio from a desired reduction ratio is computed. A proportional and integral control is carried out so as to reduce the deviation in good response. A proportional term control gain and an integral term control gain are given different values for downshifting and upshifting, respectively, so as to provide a quick response in downshifting and a gradual response in upshifting.
Inventors
- 👤 Katsunori Oshiage
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 17:04
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/66; B; B60; B60W; B60W10/00; B60W10/04; B60W10/10; B60W10/101; B60W30/00; B60W30/18; B60W30/1819; F16H61/662; F16H61/66254; F16H61/66259
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
152 words
A control device for a vehicular engine continuously variable transmission system, comprising: means for determining a desired reduction ratio; means for determining an actual reduction ratio of the continuously variable transmission; means for computing a deviation by subtracting the actual reduction ratio from the desired reduction ratio; means for determining whether the deviation is positive or negative; means for setting a first control constant if the deviation is positive and a second control constant if the deviation is negative and generating a control constant indicative signal; means for determining a speed at which the actual reduction ratio of the continuously variable transmission is to be shifted toward the desired reduction ratio in response to the control constant indicative signal and generating an actuating speed indicative signal; and means for adjusting the actual reduction ratio of the continuously variable transmission toward the desired reduction ratio in response to the actuating speed indicative signal.
Claim 2
Dependent Claim
152 words
A control device for a vehicular engine continuously variable transmission system, comprising: means for determining a desired reduction ratio; means for determining an actual reduction ratio of the continuously variable transmission; means for computing a deviation by subtracting the actual reduction ratio from the desired reduction ratio; means for determining whether the deviation is positive or negative; means for setting a first control constant if the deviation is positive and a second control constant if the deviation is negative and generating a control constant indicative signal; means for determining a speed at which the actual reduction ratio of the continuously variable transmission is to be shifted toward the desired reduction ratio in response to the control constant indicative signal and generating an actuating speed indicative signal; and means for adjusting the actual reduction ratio of the continuously variable transmission toward the desired reduction ratio in response to the actuating speed indicative signal.
Claim 3
Dependent Claim
168 words
A control device for a vehicular engine continuously variable transmission system having a shift control mechanism including a motor, the control device comprising: means for determining a desired reduction ratio; means for determining an actual reduction ratio of the continuously variable transmission; means for determining a deviation of the actual reduction ratio from the desired reduction ratio; means for determining a first control gain if the deviation indicates a downshifting is required and a second control gain if the deviation indicates an upshifting is required and generating a control gain indicative signal; means for computing a speed at which the motor of the shift control mechanism is to be actuated in response to the control gain indicative signal and generating an actuating inducative signal; means for actuating the motor by one predetermined unit in a direction to reduce the deviation whenever it is rendered into operation; and means for periodically rendering said actuating means into operation with a frequency which is variable with the actuating speed indicative signal.
Claim 4
Dependent Claim
168 words
A control device for a vehicular engine continuously variable transmission system having a shift control mechanism including a motor, the control device comprising: means for determining a desired reduction ratio; means for determining an actual reduction ratio of the continuously variable transmission; means for determining a deviation of the actual reduction ratio from the desired reduction ratio; means for determining a first control gain if the deviation indicates a downshifting is required and a second control gain if the deviation indicates an upshifting is required and generating a control gain indicative signal; means for computing a speed at which the motor of the shift control mechanism is to be actuated in response to the control gain indicative signal and generating an actuating inducative signal; means for actuating the motor by one predetermined unit in a direction to reduce the deviation whenever it is rendered into operation; and means for periodically rendering said actuating means into operation with a frequency which is variable with the actuating speed indicative signal.
Claim 5
Dependent Claim
20 words
A control device as claimed in claim 2, wherein said first control gain is larger than the second control gain.
References Cited (Backward Citations)
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