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| Device for receiving sound waves in a well |
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Apparatus for controlling continuously variable transmission
| Details |
Inventors: Osanai, Akinori; Niwa, Takao; Gono, Takeshi;
Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota, JP)
Primary Examiner: Lall; P. S.
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Fisher, Spivak, McClelland & Maier
A continuously variable transmission (CVT) is controlled such that an actual engine speed Ne is equalized to a desired engine speed Ne'. Defining Nc as a positive constant, the speed ratio e of the CVT is substantially fixed during a period of time when the Ne changes from Ne<Ne'-Nc to Ne'-Nc.ltoreq.Ne<Ne' and then changes to Ne.gtoreq.Ne'. Ne'-Nc is defined as a temporarily desired engine speed during a period of time when the Ne changes from Ne.gtoreq.Ne' to Ne'-Nc.ltoreq.Ne<Ne' and then changes to Ne<Ne'-Nc. During the period of time the speed ratio of the CVT is changed such that the actual engine speed Ne is equalized to the temporarily desired engine speed Ne'-Nc. |
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DETAILED DESCRIPTION An object of the present invention is to provide an apparatus for controlling a continuously variable transmission (CVT) which is advantageous both in a specific fuel consumption and acceleration performance.
According to the present invention to achieve this object, in the apparatus for controlling the CVT such that an actual engine speed Ne is equalized to a desired engine speed Ne', the speed change of the CVT is controlled such that when (a) the Nc is defined as a positive constant, (b) Ne becomes Ne<Ne'-Nc and then Ne'-Nc.
ltoreq.
Ne<Ne', the speed ratio e of the CVT is fixed or or almost fixed until Ne becomes Ne.
gtoreq.
-Ne' and (c) when Ne becomes Ne.
gtoreq.
Ne' and then Ne'-Nc.
ltoreq.
Ne<Ne', Ne'-Nc is set to a temporary desired engine speed Net' until Ne becomes Ne<Ne'-Nc to achieve Ne=Net'.
As a result, in acceleration, a period of time when the speed ratio e is approximately fixed and that when the speed change of the CVT is performed appear alternatively and a fixed value of the speed ratio e increases stepwise to ensure a satisfactory acceleration performance while the fixing time of the speed ratio e in the acceleration increases to restrain the transmission loss of the CVT and improve the specific fuel consumption.
Also in the acceleration, the speed ratio e may be approximately fixed (slight speed change) instead of being fixed.
In a short, the speed change may be controlled only in high transmission efficiency.
In this case Ne'>Ne is to be provided without the acceleration (vehicle speed increase) in Net'<Ne<Ne'.
In a preferred embodiment, to judge whichever Ne becomes Ne'-Nc.
ltoreq.
Ne<Ne' from Ne<Ne'-Nc or Ne.
ltoreq.
-Ne', a flag Fn is set if Ne.
gtoreq.
-Ne' and reset if Ne<Ne'-Nc.
Thus, when Ne'Nc.
ltoreq.
-Ne<Ne' and Fn=0, the speed ratio e is approximately fixed, and when Ne'-Nc.
ltoreq.
Ne<Ne' and Fn=1, Ne'-Nc is set to a temporary desired engine speed Net' and the speed change of the CVT is controlled so as to provide Ne=Net'
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