EP0092227A1
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EP
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Method for controlling reduction ratio of continuously variable transmission with acceleration compensation
Assignee: Nissan Motor Co Ltd
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Filing: 1983-04-19
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Granted: —
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Expires: 2003-04-19
Abstract
Abstract A method and an apparatus for controlling the reduction ratio of a continuously variable transmission are disclosed wherein normally the reduction ratio is controlled in response to a desired optimum reduction ratio indicative signal obtained by retrieving the data stored in a memory versus engine load and vehicle speed, but when more vehicle acceleration is needed, the reduction ratio is controlled by a corrected desired optimum reduction ratio indicative signal to increase the reduction ratio.
Inventors
- 👤 Sigeaki Yamamuro
- 👤 Keiju Abo
- 👤 Yoshikazu Tanaka
- 👤 Haruyoshi Kumura
- 👤 Hiroyuki Hirano
- 👤 Yoshiro Morimoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 17:43
CPC Classifications
B; B60; B60W; B60W10/00; B60W10/04; B60W10/06; B60W10/10; B60W10/101; B60W30/00; B60W30/18; B60W30/1819; F; F16; F16H; F16H61/00; F16H61/66; B60W2520/00; B60W2520/10; B60W2520/105; B60W2710/00; B60W2710/10; B60W2710/1005
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
141 words
A method for controlling a reduction ratio of a continuously variable transmission of an automotive vehicle having an internal combustion engine, comprising: a) generating an acceleration indicative signal representing a vehicle acceleration of the automotive vehicle; b) detecting at least one operating condition of the automotive vehicle; c) generating a desired optimum reduction ratio indicative signal representing a desired optimum reduction ratio for the detected operating condition of the automotive vehicle in response to at least the acceleration indicative signal; d) adjusting the actual reduction ratio of the continuously variable transmission toward a value which agrees with the desired optimum reduction ratio represented by the optimum reduction ratio indicative signal; and e) repeating the steps a), b), c) and d) until the actual reduction ratio agrees with said desired optimum reduction ratio represented by the desired optimum reduction ratio indicative signal.
Claim 2
Independent Claim
141 words
A method for controlling a reduction ratio of a continuously variable transmission of an automotive vehicle having an internal combustion engine, comprising: a) generating an acceleration indicative signal representing a vehicle acceleration of the automotive vehicle; b) detecting at least one operating condition of the automotive vehicle; c) generating a desired optimum reduction ratio indicative signal representing a desired optimum reduction ratio for the detected operating condition of the automotive vehicle in response to at least the acceleration indicative signal; d) adjusting the actual reduction ratio of the continuously variable transmission toward a value which agrees with the desired optimum reduction ratio represented by the optimum reduction ratio indicative signal; and e) repeating the steps a), b), c) and d) until the actual reduction ratio agrees with said desired optimum reduction ratio represented by the desired optimum reduction ratio indicative signal.
Claim 3
Dependent Claim
51 words
A method as claimed in claim 1, including: generating a reference acceleration indicative signal representing a reference acceleration; and comparing the acceleration indicative signal with the reference acceleration indicative signal, and wherein the correcting step is effected when the actual acceleration indicative signal is less than the reference acceleration indicative signal.
Claim 4
Dependent Claim
28 words
A method as claimed in claim 2, wherein said at least one operating condition is represented by an engine load indicative signal and a vehicle speed indicative signal.
Claim 5
Dependent Claim
41 words
A method as claimed in claim 2, wherein the desired reduction ratio indicative signal is a function having as a variable a value which is proportional to a difference between the actual acceleration indicative signal and the reference acceleration indicative signal.
Claim 6
Dependent Claim
23 words
A method as claimed in claim 2, wherein the desired reduction ratio indicative signal is obtained by correction based on a predetermined value.
Claim 7
Dependent Claim
57 words
A method as claimed in claim 3, wherein the desired' optimum reduction ratio indicative signal data are stored in a memory for a set of the engine load indicative signal and the vehcicle speed indicative signal, and wherein the desired optimum reduction ratio indicative signal obtained by retrieving the first reduction ratio indicative signal data is corrected.
Claim 8
Dependent Claim
49 words
A method as claimed in claim 6, wherein the correction of the desired optimum reduction ratio indicative signal is effected by varying the desired optimum reduction ratio indicative signal by a value which is proportional to a difference between the acceleration indicative signal and the reference acceleration indicative signal.
Claim 9
Dependent Claim
33 words
A method as claimed in claim 6, wherein the correction of the desired optimum reduction ratio indicative signal is effected by varying the desired optimum reduction ratio indicative signal by a predetermined value.
Claim 10
Dependent Claim
82 words
A method as claimed in claim 3, wherein the desired optimum reduction ratio indicative signal data are stored in a memory for a set of the engine load indicative signal and the vehicle speed indicative signal, and wherein the engine load indicative signal is corrected to provide a corrected engine load indicative signal, and the desired optimum reduction ratio indicative signal is obtained by retrieving the first desired optimum reduction ratio indicative signal data based on the corrected engine load indicative, signal.
Claim 11
Dependent Claim
79 words
A method as claimed in claim 3, wherein the desired optimum reduction ratio indicative signal data are stored in a memory for a set of the engine load indicative signal and the vehicle speed indicative signal, and wherein the vehicle speed indicative signal is corrected to provide a corrected vehicle speed indicative signal and the desired optimum reduction ratio indicative signal is obtained by retrieving the optimum reduction ratio indicative signal based upon the corrected vehicle speed indicative signal.
Claim 12
Dependent Claim
40 words
A method as claimed in claim 2, wherein the data of the reference acceleration are acceleration values given when the automotiove vehicle travels through the plain terrain with the reduction ratio represented by the desired optimum reduction ratio indicative signal.
Claim 13
Dependent Claim
31 words
A method as claimed in claim 2, wherein with the reduction ratio represented by the desired optimum reduction ratio signal, the automotive vehicle can travel at the minum fuel consumption rate.
Claim 14
Dependent Claim
74 words
A method as claimed in claim 1, including: generating a reference acceleration indicative signal representing a reference acceleration; generating a load indicative signal representing an engine load on the internal combustion engine, and wherein the desired optimum reduction ratio signal is corrected when the acceleration indicative signal is at least equal to the reference acceleration indicative signal and at the same time when the engine load indicative signal is less than a predetermined value.
Claim 15
Dependent Claim
28 words
A method as claimed in claim 13, wherein said at least one operating condition is represented by an engine load indicative signal and a vehicle speed indicative signal.
Claim 16
Dependent Claim
50 words
A method as claimed in claim 14, wherein the vehicle acceleration indicative signal is obtained as a result of computing a difference between a first vehicle speed value measured at a particular instance and a second vehicle speed value measured at another instance after the elapse of a predetermined period.
Claim 17
Dependent Claim
22 words
A method as claimed in claim 13, wherein the idle state of the engine is detected by measuring the throttle opening degree.
Claim 18
Dependent Claim
15 words
A method as claimed in claim 13, wherein the reference acceleration is a zero value.
Claim 19
Dependent Claim
57 words
A method as claimed in claim 14, wherein the desired optimum reduction ratio indicative signal data are stored in a memory for a set of the engine load indicative signal and the vehicle speed indicative signal, and wherein the desired optimum reduction ratio indicative signal is corrected after retrieving the desired optimum reduction ratio indicative signal data.
Claim 20
Dependent Claim
23 words
A method as claimed in claim 14, including generating an engine revolution speed indicative signal representing the engine revolution speed of the engine.
Claim 21
Dependent Claim
96 words
A method as claimed in claim 19, wherein the desired optimum reduction ratio indicative signal data are stored in a memory for a set of the engine load indicative signal and the vehicle speed indicative signal, and wherein an actual reduction ratio is obtained from the engine revolution speed indicative signal and the vehicle speed indicative signal, an actual reduction ratio indicative signal is obtained which corresponds to the actual reduction ratio and has a predetermined relation with same, and the desired reduction ratio indicative signal is obtained by correcting the actual reduction ratio indicative signal.
Claim 22
Dependent Claim
99 words
A method as claimed in claim 19, wherein the desired optimum reduction ratio indicative signal data are stored in a memory for a set of the engine load indicative signal and the vehicle speed indicative signal, and wherein the engine revolution speed indicative signal is corrected to provide a corrected engine revolution speed indicative signal, a corrected reduction ratio is obtained from the corrected engine revolution speed indicative signal and the vehicle speed indicative signal, and the desired optimum reduction ratio indicative signal is obtained which corresponds to the corrected reduction ratio and has a predetermined relation with same.
Claim 23
Dependent Claim
97 words
A method as claimed in claim 14, wherein the desired optimum reduction ratio indicative signal data are stored in a memory for a set of the engine load indicative signal and the vehicle speed indicative signal, and wherein the vehicle speed indicative signal is corrected to provide a corrected vehicle speed indicative signal, a corrected reduction ratio is obtained from the engine revolution speed indicative signal and the corrected vehicle speed indicative signal, and said desired optimum reduction ratio indicative signal is obtained which corresponds to the corrected reduction ratio and has a predetermined relation with same.
Claim 24
Independent Claim
21 words
A method as claimed in claim-13, wherein the desired optimum reduction ratio is obtained by correction based on a predetermined value.
Claim 25
Dependent Claim
40 words
A method as claimed in claim 13, wherein the desired reduction ratio indicative signal is a function having as a variable a value which is proportional to a difference between the acceleration indicative signal and the reference acceleration indicative signal.
Claim 26
Dependent Claim
51 words
A method as claimed in claim 18, wherein when the brake is not used and when the acceleration indicative signal shifts from a value greater than the reference acceleration indicative signal to a value less than the reference acceleration indicative signal, the correction of the desired optimum reduction ratio is recorrected.
Claim 27
Independent Claim
116 words
An apparatus for controlling a reduction ratio of a continuously variable transmission of an automotive vehicle having an internal combustion engine, comprising: means for generating an acceleration indicative signal representing a vehicle acceleration of the automotive vehicle; means for detecting at least one operating condition of the automotive vehicle; means for generating a desired optimum reduction ratio indicative signal representing a desired optimum reduction ratio for the detected operating condition of the automotive vehicle in response to at least the acceleration indicative signal; and means for adjusting the actual reduction ratio of the continuously variable transmission toward a value which agrees with the desired optimum reduction ratio represented by the second optimum reduction ratio indicative signal.
Claim 28
Independent Claim
116 words
An apparatus for controlling a reduction ratio of a continuously variable transmission of an automotive vehicle having an internal combustion engine, comprising: means for generating an acceleration indicative signal representing a vehicle acceleration of the automotive vehicle; means for detecting at least one operating condition of the automotive vehicle; means for generating a desired optimum reduction ratio indicative signal representing a desired optimum reduction ratio for the detected operating condition of the automotive vehicle in response to at least the acceleration indicative signal; and means for adjusting the actual reduction ratio of the continuously variable transmission toward a value which agrees with the desired optimum reduction ratio represented by the second optimum reduction ratio indicative signal.
Claim 29
Dependent Claim
55 words
An apparatus as claimed in claim 26, including: means for generating a reference acceleration indicative signal representing a reference acceleration; and means for comparing the acceleration indicative signal with the reference acceleration indicative signal, and wherein the correcting step is effected when the actual acceleration indicative signal is less than the reference acceleration indicative signal.
Claim 30
Dependent Claim
28 words
An apparatus as claimed in claim 27, wherein said at least one operating condition is represented by an engine load indicative signal and a vehicle speed indicative signal.
Claim 31
Dependent Claim
41 words
An apparatus as claimed in claim 27, wherein the desired reduction ratio indicative signal is a function having as a variable a value which is proportional to a difference between the actual acceleration indicative signal and the reference acceleration indicative signal.
Claim 32
Dependent Claim
23 words
An apparatus as claimed in claim 27, wherein the desired reduction ratio indicative signal is obtained by correction based on a predetermined value.
Claim 33
Dependent Claim
56 words
An apparatus as claimed in claim 28, wherein the desired optimum reduction ratio indicative signal data are stored in a memory for a set of the engine load indicative signal and the vehcicle speed indicative signal, and wherein the desired optimum reduction ratio indicative signal is corrected after retrieving the desired reduction ratio indicative signal data.
Claim 34
Dependent Claim
81 words
An apparatus as claimed in claim 28, wherein the desired optimum reduction ratio indicative signal data are stored in a memory for a set of the engine load indicative signal and the vehicle speed indicative signal-, and wherein the engine load indicative signal is corrected to provide a corrected engine load indicative signal, and the desired optimum reduction ratio indicative signal is obtained by retrieving the desired optimum reduction ratio indicative signal data based on the corrected engine load indicative signal.
Claim 35
Dependent Claim
79 words
An apparatus as claimed in claim 28, wherein the desired optimum reduction ratio indicative signal data are stored in a memory for a set of the engine load indicative signal and the vehicle speed indicative signal, and wherein the vehicle speed indicative signal is corrected to provide a corrected vehicle speed indicative signal and the desired optimum reduction ratio indicative signal is obtained by retrieving the optimum reduction ratio indicative signal based upon the corrected vehicle speed indicative signal.
Claim 36
Dependent Claim
40 words
An apparatus as claimed in claim 27, wherein the data of the reference acceleration are acceleration values given when the automotiove vehicle travels through the plain terrain with the reduction ratio represented by the desired optimum reduction ratio indicative signal.
Claim 37
Dependent Claim
79 words
An apparatus as claimed in claim 26, including: means for generating a reference acceleration indicative signal representing a reference acceleration; means for generating a load indicative signal representing an engine load on the internal combustion engine, and wherein the desired optimum reduction ratio indicative signal is corrected when the acceleration indicative signal is at least equal to the reference acceleration indicative signal and at the same time when the engine load indicative signal is less than a predetermined value.
Claim 38
Dependent Claim
28 words
An apparatus as claimed in claim 35, wherein said at least one operating condition is represented by an engine load indicative signal and a vehicle speed indicative signal.
Claim 39
Dependent Claim
67 words
An apparatus as claimed in claim 36, wherein the desired optimum reduction ratio indicative signal data are stored in a memory for a set of the engine load indicative signal and the vehicle speed indicative signal, and wherein the desired optimum reduction ratio indicative signal is obtained by correcting the desired optimum reduction ratio indicative signal obtained by retrieving the desired optimum reduction ratio indicative signal data.
Claim 40
Dependent Claim
25 words
An apparatus as claimed in claim 36, including means for generating an engine revolution speed indicative signal representing the engine revolution speed of the engine.
Claim 41
Dependent Claim
96 words
An apparatus as claimed in claim 36, wherein the desired optimum reduction ratio indicative signal data are stored in a memory for a set of the engine load indicative signal and the vehicle speed indicative signal, and wherein an actual reduction ratio is obtained from the engine revolution speed indicative signal and the vehicle speed indicative signal, an actual reduction ratio indicative signal is obtained which corresponds to the actual reduction ratio and has a predetermined relation with same, and the desired reduction ratio indicative signal is obtained by correcting the actual reduction ratio indicative signal.
Claim 42
Dependent Claim
99 words
An apparatus as claimed in claim 36, wherein the desired optimum reduction ratio indicative signal data are stored in a memory for a set of the engine load indicative signal and the vehicle speed indicative signal, and "wherein the engine revolution speed indicative signal is corrected to provide a corrected engine revolution speed indicative signal, a corrected reduction ratio is obtained from the corrected engine revolution speed indicative signal and the vehicle speed indicative signal, and the desired optimum reduction ratio indicative signal is obtained which corresponds to the corrected reduction ratio and has a predetermined relation with same.
Claim 43
Dependent Claim
97 words
An apparatus as claimed in claim 36, wherein the desired optimum reduction ratio indicative signal data are stored in a memory for a set of the engine load indicative signal and the vehicle speed indicative signal, and wherein the vehicle speed indicative signal is corrected to provide a corrected vehicle speed indicative signal, a corrected reduction ratio is obtained from the engine revolution speed indicative signal and the corrected vehicle speed indicative signal, and said desired optimum reduction ratio indicative signal is obtained which corresponds to the corrected reduction ratio and has a predetermined relation with same.
Claim 44
Dependent Claim
51 words
An apparatus as claimed in claim 37, wherein when the brake is not used and when the acceleration indicative signal shifts from a value greater than the reference acceleration indicative signal to a value less than the reference acceleration indicative signal, the correction of the desired optimum reduction ratio is recorrected.
References Cited (Backward Citations)
US4157124A
Cited
US4246807A
Cited
FR2423689A1
Cited
GB2042658A
Cited
DE2923986A1
Cited
DE3003749A1
Cited
FR2461169A1
Cited
DE2947658A1
Cited
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