Patent ID: 7188717
Filing Date: 2007-03-13
Classification: B60W,F16D,F16H,Y10T

Abstract:
1. A control apparatus for a power train including a continuously variable transmission and a clutch that is arranged in series with the continuously variable transmission, comprising: an engaging pressure reducing unit that reduces an engaging pressure of the clutch that is in a fully engaged state until a slip of the clutch occurs; a re-engaging unit that increases the engaging pressure of the clutch after detection of the slip so as to re-engage the clutch; a pressure calculating unit that calculates the engaging pressure of the clutch by giving a predetermined excess pressure to the engaging pressure at which the clutch is re-engaged, such that an excess amount of a transmitted torque of the clutch over a transmitted torque with which a slip occurs in the clutch is set smaller than an excess amount of a transmitted torque of the continuously variable transmission over a transmitted torque with which a slip occurs in the transmission; a judder history determining unit that determines whether the clutch has experienced judder; and an engaging pressure change rate setting unit that sets a first rate of change of the engaging pressure of the clutch in a case where the judder history determining unit determines that the clutch has experienced the judder, to be larger than a second rate of change of the engaging pressure in a case where the judder history determining unit determines that the clutch has experienced no judder.