METHOD FOR THE CONTROL OF A SHIFTING OPERATION OF AN AUTOMATIC TRANSMISSION
A method is provided for the control of a shifting operation of an automatic transmission by means of an electronic transmission control unit. The transmission control unit receives of a maximum engine rotational speed EGSmax from an engine control unit, compares the current engine rotational speed EGScurrent with the maximum engine rotational speed EGSmax, and initiates upshifting if EGScurrent≧EGSmax-x, where x is a calibratable offset.
1 . A method for control of a shifting operation of an automatic transmission, comprising:
receiving, with a transmission control unit, a maximum engine rotational speed (EGSmax) from an engine control unit; and
comparing, with the transmission control unit, a current engine rotational speed (EGScurrent) with the maximum engine rotational speed (EGSmax); and
initiating an upshifting if EGScurrent≧EGSmax-x,
wherein x is a first calibratable offset.
2 . The method according to claim 1 , the method further comprising:
comparing, with the transmission control unit, a engine rotational speed (EGSlg) in a lower gear with the maximum engine rotational speed (EGSmax) in event of a command for downshifting into the lower gear; and
preventing downshifting if EGSlg≧EGSmax-y,
wherein y is a second calibratable offset.
3 . The method according to claim 1 , further comprising incorporating changes of the current engine rotational speed (EGScurrent) in the first calibratable offset (x) during the upshifting.
4 . The method according to claim 2 , further comprising incorporating changes of the current engine rotational speed (EGScurrent) in the second calibratable offset (y) during downshifting.
5 . The method according to claim 1 , further comprising incorporating a temperature in the maximum engine rotational speed (EGSmax) determined by the engine control unit.
6 . The method according to claim 1 , further comprising incorporating a pressure in the maximum engine rotational speed (EGSmax) determined by the engine control unit.
7 . The method according to claim 1 , further comprising incorporating engine friction in the maximum engine rotational speed (EGSmax) determined by the engine control unit.
8 . The method according to claim 1 , further comprising incorporation output power of an engine applied to a crankshaft in the maximum engine rotational speed (EGSmax) determined by the engine control unit.
9 . An apparatus for the controlling a shifting operation of an automatic transmission, comprising:
an engine control unit adapted to provide a maximum engine rotational speed (EGSmax);
a transmission control unit adapted to:
receive the maximum engine rotational speed (EGSmax) from the engine control unit;
compare a current engine rotational speed (EGScurrent) with the maximum engine rotational speed (EGSmax); and
initiating upshifting if EGScurrent≧EGSmax-x,
wherein x is a first calibratable offset.
10 . The apparatus according to claim 9 , the transmission control unit further adapted to:
compare a engine rotational speed (EGSlg) in a lower gear with the maximum engine rotational speed (EGSmax) in event of a command for downshifting into the lower gear; and
prevent downshifting if EGSlg≧EGSmax-y,
wherein y is a second calibratable offset.
11 . The apparatus according to claim 9 , the transmission control unit further adapted to incorporate changes of the current engine rotational speed (EGScurrent) in the first calibratable offset (x) during the upshifting.
12 . The apparatus according to claim 10 , the transmission control unit further adapted to incorporate changes of the current engine rotational speed (EGScurrent) in the second calibratable offset (y) during downshifting.
13 . The apparatus according to claim 10 , the transmission control unit further adapted to incorporate a temperature in the maximum engine rotational speed (EGSmax) determined by the engine control unit.
14 . The apparatus according to claim 9 , the transmission control unit further adapted to incorporate a pressure in the maximum engine rotational speed (EGSmax) determined by the engine control unit.
15 . The apparatus according to claim 9 , the transmission control unit further adapted to incorporate engine friction in the maximum engine rotational speed (EGSmax) determined by the engine control unit.
16 . The apparatus according to claim 9 , the transmission control unit further adapted to incorporate output power of an engine applied to a crankshaft in the maximum engine rotational speed (EGSmax) determined by the engine control unit.