EP0093312A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method and apparatus for controlling reduction ratio of continuously variable transmission with accelerator pedal displacement speed compensation
Assignee: Nissan Motor Co Ltd
•
Filing: 1983-04-19
•
Granted: —
•
Expires: 2003-04-19
Abstract
Abstract A method and an apparatus controls a reduction ratio of a continuously variable transmission of an automotive vehicle, wherein the reduction ratio is increased when the depression degree of the accelerator pedal is increased rapidly for ensuring quick acceleration. When the depression degree of the accelerator pedal is decreased rapidly, the reduction ratio is held for a predetermined period of time. Under this condition, the reduction ratio may be controlled to accomplish a predetermined deceleration.
Inventors
- 👤 Keiju Abo
- 👤 Haruyoshi Kumura
- 👤 Hiroyuki Hirano
- 👤 Yoshikazu Tanaka
- 👤 Sigeaki Yamamuro
- 👤 Yoshiro Morimoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 20:06
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/66; F16H61/662; F16H61/66254; F16H61/66259; F16H2061/6604; F16H2061/6611; F16H2061/6612; F16H59/00; F16H59/14; F16H59/141; F16H59/18; F16H59/22
Claims Analysis
Total Claims: 54
Claim 1
Independent Claim
157 words
A method for controlling a reduction ratio of a continuously variable transmission of an automotive vehicle having a brake pedal and an internal combustion engine with an accelerator pedal; comprising: a) generating an accelerator pedal displacement speed indicative signal representing the speed of displacement of the accelerator pedal; 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 accelerator pedal displacement speed 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 desired 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
157 words
A method for controlling a reduction ratio of a continuously variable transmission of an automotive vehicle having a brake pedal and an internal combustion engine with an accelerator pedal; comprising: a) generating an accelerator pedal displacement speed indicative signal representing the speed of displacement of the accelerator pedal; 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 accelerator pedal displacement speed 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 desired 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
59 words
A method as claimed in claim 1, further comprising: generating a vehicle speed indicative signal representing a vehicle speed of the automotive vehicle; and generating an engine load indicative signal representing a load on the internal combustion engine, wherein said at least one operating condition is represented by the vehicle speed indicative signal and the engine load indicative signal.
Claim 4
Dependent Claim
56 words
A method as claimed in claim 2, wherein, at least when the accelerator pedal displacement speed indicative signal is at least equal to a predetermined accelerator pedal displacement speed value, a corrected desired optimum reduction ratio is obtained which is larger than a normal desired optimum reduction ratio otherwise obtained for the same detected operating condition.
Claim 5
Dependent Claim
69 words
A method as claimed in claim 3, including: carrying out a correction, at least when the accelerator pedal displacement speed indicative signal is at least equal to the predetermined acclerator pedal displacement speed value, by a value determined by a predetermined function having as a variable the accelerator pedal displacement speed indicative signal to generate the desired optimum reduction ratio indicative signal representing the corrected desired optimum reduction ratio.
Claim 6
Dependent Claim
54 words
A method as claimed in claim 3, including: carrying out a correction, at least when the accelerator pedal displacement speed indicative signal is at least equal to the predetermined accelerator pedal displacement speed value, by a constant value to generate the desired optimum reduction ratio indicative signal representing the corrected desired optimum reduction ratio.
Claim 7
Dependent Claim
83 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, at least when the accelerator pedal displacement speed indicative signal is at least equal to the predetermined accelerator pedal displacement speed value, the desired optimum reduction ratio indicative signal representing the corrected desired optimum reduction ratio is obtained by correcting the engine load indicative signal.
Claim 8
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, at least when the accelerator pedal displacement speed indicative signal is at least equal to the predetermined accelerator pedal displacement speed value, the desired optimum reduction ratio indicative signal representing the corrected optimum reduction ratio is obtained by correcting the vehicle speed indicative signal.
Claim 9
Dependent Claim
92 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, at least when the accelerator pedal indicative signal is at least equal to the predetermined accelerator pedal displacement speed value, the desired optimum reduction ratio indicative signal representing the corrected reduction ratio is obtained by correcting the desired optimum reduction ratio indicative signal obtained by retrieving the desired optimum reduction ratio indicative signal data.
Claim 10
Dependent Claim
139 words
A method as claimed in claim 3, wherein first 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 second desired optimum reduction ratio indicative signal data are stored in the 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 representing the normal reduction ratio is obtained by retrieving the first desired optimum reduction ratio indicative signal data and, at least when the accelerator pedal displacement speed indicative signal is at least equal to the predetermined accelerator pedal displacement speed value, the desired optimum reduction ratio indicative signal representing the corrected reduction ratio is obtained by retrieving the second optimum reduction ratio indicative signal data.
Claim 11
Dependent Claim
70 words
A method as claimed in claim 2, wherein, when the vehicle speed indicative signal is at least equal to a predetermined vehicle speed value and the accelerator pedal displacement speed indicative signal is at least equal to a predetermined accelerator pedal displacement speed value, a corrected desired optimum reduction ratio is obtained which is larger than a normal desired optimum reduction ratio otherwise obtained for the same detected operating condition.
Claim 12
Dependent Claim
104 words
A method as claimed in claim 1, further comprising: generating a release signal; generating an accelerator pedal depression degree indicative signal representing the depression degree of the accelerator pedal; holding the desired optimum reduction ratio indicative signal as long as the release signal is absent for a first predetermined period of time after an instance when the accelerator pedal displacement speed indicative signal becomes at least equal to a predetermined accelerator pedal displacement speed value and indicates that the degree of the acclerator pedal decreases and when the accelerator pedal depression degree indicative signal becomes less than a predetermined accelerator pedal depression degree value.
Claim 13
Dependent Claim
60 words
A method as claimed in claim 11, further comprising: generating a vehicle speed indicative signal representing a vehicle speed of the automotive vehicle; and generating an engine load indicative signal representing a load on the internal combustion engine, wherein said at least one operating condition is represented by the vehicle speed indicative signal and the engine load indicative signal. 1
Claim 14
Dependent Claim
31 words
A method as claimed in claim 11, wherein the desired optimum reduction ratio held for the first predetermined period of time represents a desired optimum reduction ratio obtained at said instance.
Claim 15
Dependent Claim
30 words
A method as claimed in claim 12, wherein the release signal is generated when the vehicle speed indicative signal is less than or equal to a predetermined vehicle speed value.
Claim 16
Dependent Claim
19 words
A method as claimed in claim 11, wherein the release signal is generated when the brake pedal is depressed.
Claim 17
Dependent Claim
31 words
A method as claimed in claim 11, wherein the release signal is generated when the accelerator pedal depression degree indicative signal is greater than the predetermined accelerator pedal depression degree value.
Claim 18
Dependent Claim
39 words
A method as claimed in claim 11, wherein the accelerator pedal displacement speed indicative signal is obtained by computing a difference in depression degree indicative signal obtained each time after the elapse of a second predetermined period of time.
Claim 19
Dependent Claim
23 words
A method as claimed in claim 17, wherein the second predetermined period of time is shorter than the first predetermined period of time.
Claim 20
Dependent Claim
36 words
A method as claimed in claim 12, 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.
Claim 21
Dependent Claim
80 words
20 A method as claimed in claim 19, including: holding the engine load indicative signal for the first predetermined period of time after said instance to generate the same engine load indicative signal; and retrieving the desired optimum reduction ratio indicative signal data based on the same engine load indicative signal generated by said holding step and the vehicle speed indicative signal for said first predetermined period of time to generate substantially the same desired optimum reduction ratio indicative signal.
Claim 22
Dependent Claim
133 words
A method as claimed in claim 19, including: generating an engine revolution speed indicative signal representing the engine revolution speed; retrieving the desired optimum reduction ratio signal data based on the engine load indicative signal and the vehicle speed indicative signal to obtain the desired optimum reduction ratio indicative signal; computing a predetermined equation having as variables the engine revolution speed indicative signal and the vehicle speed indicative signal which are obtained at said instance to provide an actual reduction ratio; generating an actual reduction ratio indicative signal which corresponds to said actual reduction ratio and has a predetermined relation with same; and giving said desired optimum reduction ratio obtained by retrieving the desired optimum reduction ratio indicative signal data said actual reduction ratio indicative signal for the first predetermined period of time.
Claim 23
Dependent Claim
54 words
A method as claimed in claim 11, further comprising: detecting a deceleration of the automotive vehicle from said vehicle indicative signal and generating a deceleration indicative signal; correcting that desired optimum reduction ratio which is held at said instance by a predetermined value until the deceleration indicative signal agrees with a predetermined deceleration value.
Claim 24
Dependent Claim
26 words
A method as claimed in claim 22, wherein the predetermined deceleration value is determined by a function having as a variable the vehicle speed indicative signal.
Claim 25
Dependent Claim
41 words
A method as claimed in claim 22, wherein said predetermined value by which the desired optimum reduction indicative signal is corrected is determined by a function having as a variable a difference between the deceleration indicative signal and a desired deceleration.
Claim 26
Dependent Claim
34 words
A method as claimed in claim 22, wherein the value by which the desired reduction ratio indicative signal is corrected is determined by a function having as a variable the vehicle speed indicative signal.
Claim 27
Dependent Claim
29 words
A method as claimed in claim 22, wherein the release signal is generated when the vehicle speed indicative signal is less than or equal to a predetermined vehicle speed.
Claim 28
Dependent Claim
19 words
A method as claimed in claim 22, wherein the release signal is generated when the brake pedal is depressed.
Claim 29
Dependent Claim
29 words
A method as claimed in claim 22, wherein the release signal is generated when the accelerator pedal depression indicative signal is greater than a predetermined accelerator pedal depression value.
Claim 30
Dependent Claim
72 words
A method as claimed in claim 22, wherein the accelerator pedal displacement indicative signal is obtained by computing a difference in the throttle opening degree indicative signal obtained each time after the elapse of a second predetermined period of time and the vehicle speed deceleration indicative signal is obtained by computing a difference in the vehicle speed indicative signal obtained each time after the elapse of the second predetermined period of time.
Claim 31
Dependent Claim
23 words
A method as claimed in claim 29, wherein the second predetermined period of time is shorter than the first predetermined period of time.
Claim 32
Independent Claim
131 words
An apparatus for controlling a reduction ratio of a continuously variable transmission of an automotive vehicle having a brake pedal and an internal combustion engine with an accelerator pedal, comprising: means for generating an accelerator pedal displacement speed indicative signal representing the speed of displacement of the accelerator pedal; 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 accelerator pedal displacement speed 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 desired optimum reduction ratio indicative signal.
Claim 33
Independent Claim
131 words
An apparatus for controlling a reduction ratio of a continuously variable transmission of an automotive vehicle having a brake pedal and an internal combustion engine with an accelerator pedal, comprising: means for generating an accelerator pedal displacement speed indicative signal representing the speed of displacement of the accelerator pedal; 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 accelerator pedal displacement speed 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 desired optimum reduction ratio indicative signal.
Claim 34
Dependent Claim
63 words
An apparaus as claimed in claim 31, further comprising: means for generating a vehicle speed indicative signal representing a vehicle speed of the automotive vehicle; and means for generating an engine load indicative signal representing a load on the internal combustion engine, wherein said at least one operating condition is represented by the vehicle speed indicative signal and the engine load indicative signal.
Claim 35
Dependent Claim
57 words
An apparatus as claimed in claim 32, wherein, at least when the accelerator pedal displacement speed indicative signal is at least equal to a predetermined accelerator pedal displacement speed value, a corrected desired optimum reduction ratio is obtained which is larger than a normal desired optimum reduction ratio . otherwise obtained for the same detected operating condition.
Claim 36
Dependent Claim
71 words
An apparatus as claimed in claim 33, including: means for carrying out a correction, at least when the accelerator pedal displacement speed indicative signal is at least equal to the predetermined acclerator pedal displacement speed value, by a value determined by a predetermined function having as a variable the accelerator pedal displacement speed indicative signal to generate the desired optimum reduction ratio indicative signal representing the corrected desired optimum reduction ratio.
Claim 37
Dependent Claim
56 words
An apparatus as claimed in claim 33, including: means for carrying out a correction, at least when the accelerator pedal displacement speed indicative signal is at least equal to the predetermined accelerator pedal displacement speed value, by a constant value to generate the desired optimum reduction ratio indicative signal representing the corrected desired optimum reduction ratio.
Claim 38
Dependent Claim
83 words
An apparatus as claimed in claim 33, 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, at least when the accelerator pedal displacement speed indicative signal is at least equal to the predetermined accelerator pedal displacement speed value, the desired optimum reduction ratio indicative signal representing the corrected desired optimum reduction ratio is obtained by correcting the engine load indicative signal.
Claim 39
Dependent Claim
82 words
An apparatus as claimed in claim 33, 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, at least when the accelerator pedal displacement speed indicative signal is at least equal to the predetermined accelerator pedal displacement speed value, the desired optimum reduction ratio indicative signal representing the corrected optimum reduction ratio is obtained by correcting the vehicle speed indicative signal.
Claim 40
Dependent Claim
92 words
An apparatus as claimed in claim 33, 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, at least when the accelerator pedal indicative signal is at least equal to the predetermined accelerator pedal displacement speed value, the desired optimum reduction ratio indicative signal representing the corrected reduction ratio is obtained by correcting the desired optimum reduction ratio indicative signal obtained by retrieving the desired optimum reduction ratio indicative signal data.
Claim 41
Dependent Claim
139 words
An apparatus as claimed in claim 33, wherein first 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 second desired optimum reduction ratio indicative signal data are stored in the 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 representing the normal reduction ratio is obtained by retrieving the first desired optimum reduction ratio indicative signal data and, at least when the accelerator pedal displacement speed indicative signal is at least equal to the predetermined accelerator pedal displacement speed value, the desired optimum reduction ratio indicative signal representing the corrected reduction ratio is obtained by retrieving the second optimum reduction ratio indicative signal data.
Claim 42
Dependent Claim
70 words
An apparatus as claimed in claim 32, wherein, when the vehicle speed indicative signal is at least equal to a predetermined vehicle speed value and the accelerator pedal displacement speed indicative signal is at least equal to a predetermined accelerator pedal displacement speed value, a corrected desired optimum reduction ratio is obtained which is larger than a normal desired optimum reduction ratio otherwise obtained for the same detected operating condition.
Claim 43
Dependent Claim
110 words
An apparatus as claimed in claim 31, further comprising: means for generating a release signal; means for generating an accelerator pedal depression degree indicative signal representing the depression degree of the accelerator pedal; means for holding the desired optimum reduction ratio indicative signal as long as the release signal is absent for a first predetermined period of time after an instance when the accelerator pedal displacement speed indicative signal becomes at least equal to a predetermined accelerator pedal displacement speed value and indicates that the degree of the acclerator pedal decreases and when the accelerator pedal depression degree indicative signal becomes less than a predetermined accelerator pedal depression degree value.
Claim 44
Dependent Claim
63 words
An apparatus as claimed in claim 41, further comprising: means for generating a vehicle speed indicative signal representing a vehicle speed of the automotive vehicle; and means for generating an engine load indicative signal representing a load on the internal combustion engine, wherein said at least one operating condition is represented by the vehicle speed indicative signal and the engine load indicative signal.
Claim 45
Dependent Claim
31 words
An apparatus as claimed in claim 41, wherein the desired optimum reduction ratio held for the first predetermined period of time represents a desired optimum reduction ratio obtained at said instance.
Claim 46
Dependent Claim
30 words
An apparatus as claimed in claim 42, wherein the release signal is generated when the vehicle speed indicative signal is less than or equal to a predetermined vehicle speed value.
Claim 47
Dependent Claim
19 words
An apparatus as claimed in claim 41, wherein the release signal is generated when the brake pedal is depressed.
Claim 48
Dependent Claim
31 words
An apparatus as claimed in claim 41, wherein the release signal is generated when the accelerator pedal depression degree indicative signal is greater than the predetermined accelerator pedal depression degree value.
Claim 49
Dependent Claim
39 words
An apparatus as claimed in claim 41, wherein the accelerator pedal displacement speed indicative signal is obtained by computing a difference in depression degree indicative signal obtained each time after the elapse of a second predetermined period of time.
Claim 50
Dependent Claim
23 words
An apparatus as claimed in claim 47, wherein the second predetermined period of time is shorter than the first predetermined period of time.
Claim 51
Dependent Claim
36 words
An apparatus as claimed in claim 42, 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.
Claim 52
Dependent Claim
83 words
An apparatus as claimed in claim 49, including: means for holding the engine load indicative signal for the first predetermined period of time after said instance to generate the same engine load indicative signal; and means for retrieving the desired optimum reduction ratio indicative signal data based on the same engine load indicative signal generated by said holding means and the vehicle speed indicative signal for said first predetermined period of time to generate substantially the same desired optimum reduction ratio indicative signal.
Claim 53
Dependent Claim
143 words
An apparatus as claimed in claim 49, including: means for generating an engine revolution speed indicative signal representing the engine revolution speed; means for retrieving the desired optimum reduction ratio signal data based on the engine load indicative signal and the vehicle speed indicative signal to obtain the desired optimum reduction ratio indicative signal; means for computing a predetermined equation having as variables the engine revolution speed indicative signal and the vehicle speed indicative signal which are obtained at said instance to provide an actual reduction ratio; means for generating an actual reduction ratio indicative signal which corresponds to said actual reduction ratio and has a predetermined relation with same; and means for giving said desired optimum reduction ratio obtained by retrieving the desired optimum reduction ratio indicative signal data said actual reduction ratio indicative signal for the first predetermined period of time.
Claim 54
Dependent Claim
58 words
An apparatus as claimed in claim 41, further comprising: means for detecting a deceleration of the automotive vehicle from said vehicle indicative signal and generating a deceleration indicative signal; means for correcting that desired optimum reduction ratio which is held at said instance by a predetermined value until the deceleration indicative signal agrees with a predetermined deceleration value.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.