Patent ID: 6176812
Filing Date: 2001-01-23
Classification: F16H,Y10T

Abstract:
A speed change transition control apparatus for an automatic transmission which has a speed change mechanism for performing speed changes by locking or releasing a plurality of friction engaging elements and also which is equipped with a fluid pressure control element for controlling engagement pressure which is supplied to said plurality of friction engaging elements, the speed change transition control apparatus comprising:rotational speed detection means for detecting an input shaft rotation speed of said speed change mechanism;arithmetic means for computing a difference between an input shaft rotation speed at an actual inertia phase start point on a first target rotation slope with an input shaft rotation speed at a previously set inertia phase start point as the starting point and an actual input shaft rotation speed detected at an actual inertia phase start point by said rotational speed detection means;target rotation slope correction means for setting a second target rotation slope having said actual input shaft rotation speed as its starting point by moving said first target rotation slope in a parallel direction in correspondence to the input shaft rotation speed difference computed by said arithmetic means; andfeedback control means for controlling said engagement pressure through said fluid pressure control element in such a manner that said input shaft rotation speed during a speed change follows said second target rotation slope set by said target rotation slope correction means.