192 clutches and power-stop control – Transmission control and clutch control – Common control
Reexamination Certificate
2007-08-14
2007-08-14
Lorence, Richard M. (Department: 3681)
192 clutches and power-stop control
Transmission control and clutch control
Common control
C192S083000, C475S116000
Reexamination Certificate
active
11581468
ABSTRACT:
A hydraulic control circuit for an automatic transmission of a vehicle, the transmission including hydraulically operated coupling devices at least one of which is selectively operated to establish a corresponding one of speed steps, the hydraulic control circuit including electromagnetic valve devices which output respective hydraulic pressures to operate the hydraulically operated coupling devices, respectively, an all-fail detecting and switching valve device which is switched, based on an all-fail state of the electromagnetic valve devices in which none of the electromagnetic valve devices output the respective hydraulic pressures, to an operation state corresponding to a fail position to output, as a first hydraulic pressure, a source hydraulic pressure to a first hydraulically operated coupling device out of the plurality of hydraulically operated coupling devices, and an operation-state memory valve which is switched, based on a state of the vehicle before the all-fail state occurs, from a non-running position indicating that the vehicle is not running, to a running position indicating that the vehicle is running, which is kept at one of the non-running position and the running position, and which supplies an operating hydraulic pressure to one of a second and a third hydraulically operated coupling device out of the plurality of hydraulically operated coupling devices that corresponds to the one of the non-running position and the running position at which the operation-state memory valve is kept.
REFERENCES:
patent: 4628772 (1986-12-01), Nishikawa et al.
patent: 4981052 (1991-01-01), Gierer
patent: 4995285 (1991-02-01), Hayakawa et al.
patent: 5222581 (1993-06-01), Paulsen
patent: 6077182 (2000-06-01), Long et al.
patent: 6929584 (2005-08-01), Miyata et al.
patent: 2006/0025281 (2006-02-01), Nozaki et al.
patent: 37 25 578 (1988-02-01), None
patent: 1 031 770 (2000-08-01), None
patent: 9-303545 (1997-11-01), None
patent: 2000-240776 (2000-09-01), None
Miyata Hideki
Morise Masaru
Sugawara Akio
Yasuda Yuji
Lorence Richard M.
Toyota Jidosha & Kabushiki Kaisha
LandOfFree
Hydraulic control circuit for automatic transmission of vehicle does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydraulic control circuit for automatic transmission of vehicle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic control circuit for automatic transmission of vehicle will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3879188