CONTROL DEVICE AND CONTROL METHOD FOR A VEHICULAR AUTOMATIC TRANSMISSION

• Main Authors: KATO SHINJI, SAKAMOTO NAOYUKI, HOJO YASUO, WATANABE KAZUYUKI, AYABE ATSUSHI, SATO TOSHIMITSU, KIMURA HIROMICHI
• Format: Patent
• Language: English; Korean
• Published: 09.06.2003
• Edition: 7
• Subjects: BLASTING; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; THERMAL INSULATION IN GENERAL; WEAPONS

PURPOSE: To prevent the shift shock in shifting gears from a driving gear stage where correction of learning is difficult to a non-driving gear stage effectively regardless of the individual difference or deterioration with age of a friction engaging device and its control system, etc. CONSTITUTION: The duty ratio DSL3A of the linear solenoid SL3 at the constant pressure standby time when a clutch C1 is released for shifting gears from the 'D' to the 'N' range is calculated according to the following expression using the reference duty ratio dsdn at the constant pressure standby time, a correction value dsdntmp for the AT oil temperature TOIL, a correction value dsnne for the engine rotation speed NE, and learning correction values gdndlrn and gdcstapl at the time of gear-shifting from the 'N' to the 'D' range for engaging the clutch C1 and at the time of coast down-shifting from the fourth to the third speed range respectively; DSL3A=dsdn+dsdntmp+-dsdnne+ Kxgdndlrn+(1-K)gdcstapl. In the expression, K is a coefficient and set as a prescribed value in the range 0≤K≤1. D →N 시프트시에 클러치 (C1) 를 해방시킬 때 정압 대기시의 리니어 솔레노이드 (SL3) 의 듀티비 (DSL3) 를, 정압 대기의 기준 듀티비 (dsdn), AT 유온 (T) 에 관한 보정값 (dsdntmp), 엔진회전수 (NE) 에 관한 보정값 (dsdnne), 클러치 (C1) 를 걸어맞추는 N →D 시프트시 및 4 →3 코우스트 다운 시프트시의 각 학습보정값 (gdndlrn, gdcstapl) 을 이용하여 다음 식에 따라 산출하도록 하였다. K는 계수이며 0 ≤K ≤1 범위 내의 일정값이 정해진다. DSL3= dsdn＋dsdntmp＋dsdnne＋K ×gdndlrn＋ (1-K) gdcstapl