Method and apparatus for controlling a continuously variable tra

Details Method and apparatus for controlling a continuously variable tra Method and apparatus for controlling a continuously variable tra

1996-04-09

1998-02-24

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

474 28, 477 46, F16H 6100

Patent

active

057206929

ABSTRACT:
In order to optimize the speed change control of a continuously variable transmission, a necessary minimum primary pressure (Ppmin) for achieving a target speed change ratio is computed, and also a necessary minimum line pressure (Plmin) for the non occurrence of slippage between a secondary pulley 5 and a belt 6 is computed, and a required speed change ratio line pressure (Plratio) which can realize a target speed change ratio without slippage on the primary pulley 4 side is computed. The highest of these is then selected. The selected line pressure (Pl base) is then corrected by a transition line pressure (Pl add) determined from engine torque (TQ.sub.ENG) and speed change speed (SV), to obtain a final output line pressure (Plprs) which is then used to control a secondary pulley actuator 5a. In this way, speed change control can be optimized, for example by controlling slipping of the belt 6 at the time of rapid speed change.

REFERENCES:
patent: 4642069 (1987-02-01), Sawada et al.
patent: 4673378 (1987-06-01), Tokoro et al.
patent: 4674363 (1987-06-01), Miyawaki
patent: 4682519 (1987-07-01), Okada et al.
patent: 4708031 (1987-11-01), Morimoto et al.
patent: 4747327 (1988-05-01), Itoh et al.
patent: 4759236 (1988-07-01), Tezuka et al.
patent: 4785690 (1988-11-01), Yokoyama et al.
patent: 4846765 (1989-07-01), Sakai
patent: 4858497 (1989-08-01), Kouno
patent: 4881925 (1989-11-01), Hattori
patent: 4962678 (1990-10-01), Murano et al.

Affiliated with

Also associated with

Rating

Method and apparatus for controlling a continuously variable tra does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for controlling a continuously variable tra, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for controlling a continuously variable tra will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1871950