Hydraulic control system for multi-mode hybrid transmission...

Details Hydraulic control system for multi-mode hybrid transmission... Hydraulic control system for multi-mode hybrid transmission...

2008-07-25

2011-11-15

Lewis, Tisha (Department: 3655)

Interrelated power delivery controls, including engine control

Transmission control

Including fluid drive

C477S156000, C180S065275

Reexamination Certificate

active

08057355

ABSTRACT:
A hydraulic control system for a multi-mode hybrid-type power transmission is provided, including an engine-driven main pump in fluid communication with a main regulator valve, and an electrically driven auxiliary pump in fluid communication with an auxiliary regulator valve. A first pressure control solenoid is configured to provide boost pressure to the main regulator valve and thereby boost output of the main pump. A second pressure control solenoid is configured to provide boost pressure to the auxiliary regulator valve and thereby boost output of the auxiliary pump. The distribution of boost pressure from the pressure control solenoids is selectively modified such that at least one of the flows of pressurized fluid from the pumps is equal to the current line pressure requirements of the transmission during engine auto-start and auto-stop, and transitions thereto. An improved method for regulating the hydraulic control system is also provided.

REFERENCES:
patent: 4514147 (1985-04-01), Borman et al.
patent: 5944632 (1999-08-01), Hara et al.
patent: 6799109 (2004-09-01), Nakamori et al.
patent: 6805647 (2004-10-01), Silveri et al.
patent: 7041030 (2006-05-01), Kuroda et al.
patent: 2007/0240776 (2007-10-01), Mizui

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