Interrelated power delivery controls – including engine control – Transmission control – Engine controlled by transmission
Patent
1995-02-21
1996-03-26
Wright, Dirk
Interrelated power delivery controls, including engine control
Transmission control
Engine controlled by transmission
B60K 4104
Patent
active
055016421
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a shift control system for a vehicular automatic transmission.
BACKGROUND ART
In the prior art, there is disclosed in Japanese Patent Laid-Open No. 191238/1987 a structure in which an engine output torque is increased to raise the engine output temporarily at an inertial time by means for increasing the fuel temporarily at a shiftdown time.
However, this Laid-Open has not disclosed in the least what instant of the shiftdown time the timing for raising the engine output temporarily is to be set.
Generally speaking, there is conceived a method by which the timing for raising the engine output temporarily is turned and set beforehand for each of the kinds of vehicles. In this case, it is difficult to adjust the temporary engine output raising timing in advance for the aging of the automatic transmission. If the engine output raising timing is premature at the 2-1 shiftdown, for example, an accelerating state is established at the 2nd speed. If the timing is too late, on the other hand, the returning shock from the negative torque of the inertia is promoted to accelerate the vehicle at the 1st speed.
Therefore, the present invention has an object to provide a system capable of controlling the engine output timing properly at all times irrespective of the aging of the automatic transmission.
DISCLOSURE OF THE INVENTION
In order to solve the above-specified problem, according to the present invention, there is provided a shift control system for a vehicular automatic transmission, which system comprises: release end detecting means for detecting the release end of a frictional engagement element for a higher gear stage, at a shifting time from higher to lower gear stages; synchronism detecting means for detecting the synchronism between an engine R.P.M. and a rotating element in the automatic transmission at the lower gear stage; and engine output control means for controlling the output of the engine, wherein the aforementioned engine output control means starts the rise control of the engine output, when the release end of the frictional engagement element for the higher gear stage is detected by the aforementioned release end detecting means, and ends the rise control of the aforementioned engine output when the synchronism between the engine R.P.M. and the rotating element in the automatic transmission at the lower gear stage is detected by the aforementioned synchronism detecting means.
Thanks to the above-specified construction, according to the present invention, the aforementioned engine output control means starts the rise control of the engine output, when the release end of the frictional engagement element for the higher gear stage is detected by the aforementioned release end detecting means, and ends the rise control of the aforementioned engine output when the synchronism between the engine R.P.M. and the rotating element in the automatic transmission at the lower gear stage is detected by the aforementioned synchronism detecting means, so that the start and end of the engine output rise can be accurately controlled.
As described above according to the present invention, the aforementioned engine output control means starts the rise control of the engine output, when the release end of the frictional engagement element for the higher gear stage is detected by the aforementioned release end detecting means, and ends the rise control of the aforementioned engine output when the synchronism between the engine R.P.M. and the rotating element in the automatic transmission at the lower gear stage is detected by the aforementioned synchronism detecting means, so that the start and end of the engine output rise can be accurately controlled irrespective of the aging of the automatic transmission.
Since, moreover, the synchronism can be detected to start the application of the frictional engagement element for the lower gear stage by the synchronism detecting means, the shift control and the engine output control can be synchronized irrespective of the
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Hattori Masashi
Hojo Yasuo
Inuzuka Takeshi
Kaigawa Masato
Shirai Kenji
Aisin Aw Co. Ltd.
Wright Dirk
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