Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1987-11-25
1989-06-13
Braun, Leslie A.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74866, 3644241, B60K 4110
Patent
active
048381268
ABSTRACT:
An electro/hydraulic control system for automatically shifting gear stages of a multiple stage transmission gear mechanism by selectively controlling the operable effectiveness of various hydraulically operated friction units in accordance with vehicle operating conditions. The control system includes a series of hydraulic shift valves arranged in combination with at least two pressure regulator valves for controlling the supply of hydraulic actuating fluid to the friction units in response to ratio selection signals derived in an electronic control. The control system further includes at least one variable pressure solenoid whose variable pressure output is multiplexed to each pressure regulator valve in the system to provide for quality shifts between gear ratios. The desired end is effected by programmably profiling the output of the variable pressure solenoid. The regulator valves allows the profiled output of the variable pressure solenoid to pass to the effected friction unit to effect a smooth transition between gear ratios and then to deliver full actuating fluid pressure to the respective friction unit to complete the shift. To assure performance and commercial reliability, the control system includes a unique redundancy feature or characteristic. That is, the full actuating fluid pressure which is delivered to the respective friction unit is derived by either maximizing the pressure output of the variable pressure solenoid after the shift or gear change is effected or by allowing full actuating fluid pressure to pass through the regulator valve from the shift valve to the respective friction unit. In either manner, the friction unit is assuredly operated and the gear shift is effected.
REFERENCES:
patent: 3813964 (1974-06-01), Ichimura et al.
patent: 3937105 (1976-02-01), Arai et al.
patent: 3943799 (1976-03-01), Sakai et al.
patent: 4208929 (1980-06-01), Heino et al.
patent: 4262335 (1981-04-01), Ahlen et al.
patent: 4308764 (1982-01-01), Kawamoto et al.
patent: 4345489 (1982-08-01), Muller et al.
patent: 4351206 (1982-09-01), Lemieux et al.
patent: 4523281 (1985-06-01), Noda et al.
patent: 4551802 (1985-11-01), Smyth
patent: 4558612 (1985-12-01), Shimizu et al.
patent: 4563918 (1986-01-01), Sugano
patent: 4579020 (1986-04-01), Sugano
patent: 4607542 (1986-08-01), Sugano
patent: 4616531 (1986-10-01), Ogasawara et al.
patent: 4616532 (1986-10-01), Sakai et al.
patent: 4617841 (1986-10-01), Sugano
patent: 4622866 (1986-11-01), Ito et al.
patent: 4628771 (1986-12-01), Person et al.
patent: 4628772 (1986-12-01), Nishikawa et al.
patent: 4637281 (1987-01-01), Van Selous
patent: 4660441 (1987-04-01), Young
patent: 4665770 (1987-11-01), Van Selous
patent: 4665774 (1987-05-01), Oguri
patent: 4665776 (1987-05-01), Sugano
patent: 4667540 (1987-05-01), Yagi
patent: 4679466 (1987-07-01), Kumara et al.
patent: 4679988 (1987-07-01), Leorat et al.
patent: 4680989 (1987-07-01), Sykora et al.
patent: 4680992 (1987-07-01), Hayasaki et al.
patent: 4685356 (1987-08-01), Iwatsuki
patent: 4690015 (1987-09-01), Nagano et al.
patent: 4691285 (1987-09-01), Takeda
patent: 4691594 (1987-09-01), Taga et al.
Firth Darren L.
Polomski Ronald J.
Wilfinger Erich L.
Braun Leslie A.
BTR Engineering (Australia) Limited
Fox Douglas
LandOfFree
Electro/hydraulic control system for an automatic transmission does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electro/hydraulic control system for an automatic transmission, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electro/hydraulic control system for an automatic transmission will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1268317