Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Reexamination Certificate
1999-11-12
2001-04-10
Wright, Dirk (Department: 3681)
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
Reexamination Certificate
active
06213914
ABSTRACT:
BACKGROUND OF THE INVENTION
This application claims priority of DE 198 52 292.4, filed Nov. 12, 1998, the disclosure of which is expressly incorporated by reference herein.
The present invention relates to a method for selecting a gear position of an automatic transmission with at least one forward driving position and a reverse driving position, in the case of which, at defined operating conditions, a shifting operation from the forward gear position into the reverse gear position or vice-versa is ignored, characterized in that the shifting operation is carried out up to a defined first speed of the vehicle (v
1
)
Conventionally, different driving positions are provided in an automatic transmission. These include various forward driving position and at least one reverse driving position. In the case of a shifting operation from a forward driving position, for example, D, into a reverse driving position R, safety devices are installed in order to avoid damage to the transmission when shifting at an excessive vehicle speed.
In such a known shifting operation above a certain speed, the shifting operation is at first ignored. If the vehicle speed then falls below the defined limit speed, a subsequent engagement of the selected driving position will take place. This subsequent engagement of the stored driving position may surprise the driver and result in an uncomfortable engagement.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a method which avoids the above-mentioned effects such as surprise in the event of faulty operations of an automatic transmission.
This object is achieved by a method in which, in a speed range of the vehicle between the first and a second speed (v
1
<v<v
2
), during the shifting operation, only a neutral gear position is engaged; and ignoring the shifting operation above the second speed (v
2
).
REFERENCES:
patent: 4419909 (1983-12-01), Opperud et al.
patent: 4574661 (1986-03-01), Opperud et al.
patent: 4680983 (1987-07-01), Brown
patent: 5916291 (1999-06-01), McKee
patent: 36 90 165 (1986-03-01), None
patent: 44 20 930 (1994-06-01), None
Ehrmaier Rudolf
Fuerst Sigmund
Neuner Josef
Sedlmaier Anette
Bayerische Motoren Werke Aktiengesellschaft
Evenson, McKeown, Edwards & Lenahan P.L.L.C.
Wright Dirk
LandOfFree
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