Closed loop downshift quality control for an automatic transmiss

Details Closed loop downshift quality control for an automatic transmiss Closed loop downshift quality control for an automatic transmiss

1990-01-31

1992-05-12

Braun, Leslie A.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74867, B60K 4106

Patent

active

051117177

ABSTRACT:
A downshift quality control for a predetermined downshift involving engagement of a predetermined hydraulically operated friction element, i.e., a low clutch, is disclosed. A hydraulic fluid supply circuit communicates with the low clutch and includes a variable flow restrictor, i.e., an orifice and a timing valve. The timing valve is operated by a solenoid under control of a control unit. The control unit monitors a speed ratio of a revolution speed of an internal combustion engine to a revolution speed of an output member of an automatic transmission and energizes or deenergizes the solenoid to shift the timing valve to a position where a passage bypassing the orifice is opened.

REFERENCES:
patent: 4289221 (1981-09-01), Chambers et al.
patent: 4411174 (1983-10-01), Yokoi et al.
patent: 4497222 (1985-02-01), Nagaoka et al.
patent: 4527678 (1985-07-01), Pierce et al.
patent: 4653351 (1987-03-01), Downs et al.
patent: 4685356 (1987-08-01), Iwatsuki
patent: 4763545 (1988-08-01), Shibayama et al.
patent: 4789936 (1988-12-01), Kurihara et al.
patent: 4793216 (1988-12-01), Hiramatsu et al.
patent: 4796490 (1989-01-01), Butts et al.
patent: 4800497 (1989-01-01), Koori et al.
patent: 4823646 (1989-04-01), Yoshimura et al.
patent: 4838126 (1989-06-01), Walfinger et al.
patent: 4955259 (1990-09-01), Narita

Affiliated with

Also associated with

Rating

Closed loop downshift quality control for an automatic transmiss does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Closed loop downshift quality control for an automatic transmiss, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Closed loop downshift quality control for an automatic transmiss will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2423124