| 摘要 |
PROBLEM TO BE SOLVED: To surely attenuate the shock of gear change even if the torque rise for avoiding a torque drop is not sufficient at an engine torque upper limit. SOLUTION: The drop of the output torque shown in the dotted line of (a) is dissolved by the waveform of an engine torque TeU at the time of torque increase, which realizes the aimed waveform To(t) in the correspondent period and the subsequent aimed output torque waveform To(t) is realized by the torque decrease TeD and the aimed shelf pressure Pco. When the TeU is restricted to the upper limit value of the engine torque Teup as (b) and the deficiency in the torque increase shown in the hatching part is caused, it is improved only to the degree that shows in (b) with a chain line although the drop as shown in (a) with a dotted line is improved only to the degree as shown in (b) with a chain line and the subsequent steep increase becomes big. In this case, Pco is recalculated to a value (which becomes lower as Teup becomes smaller) shown by (b) so that the torque difference level does not become big around t2 and the torque waveform of TeU is the torque waveform simultaneously so that it is increasing gradually toward Teup between t2 from t1. Thereby, the torque waveform shown in (b) with the chain line is improved as shown with the dotted line. COPYRIGHT: (C)2005,JPO&NCIPI |
