Select shock attenuating method and system for automatic transmi

Details Select shock attenuating method and system for automatic transmi Select shock attenuating method and system for automatic transmi

1993-05-18

1995-01-31

Koczo, Jr., Michael

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

477117, G60K 4118

Patent

active

053855116

ABSTRACT:
According to a select shock attenuating method, line pressure, under which hydraulic fluid is supplied to hydraulically actuable and frictionally engageable coupling or couplings which are assigned to establish a gear ratio in an automatic transmission, is controlled. The automatic transmission has a plurality of selectable modes. In one mode, an appropriate one gear ratio state for a motor vehicle to start under normal road condition is established after placing a manual valve to a drive range position from a non-drive range position, while in another mode the automatic transmission is conditioned to another gear ratio. In the one mode, control signal on which the line pressure depends is subject to a pulse-like change with a first height corresponding to a first precharge level and a first duration corresponding to a first precharge period of time, then to a gradual increase at a first rate until a first coupling period of time is expired, and then to a drop to such a level as to keep the line pressure high enough to maintain torque transmission. In the another mode, the control signal is subject to a pulse-like change with a second height corresponding to a second precharge level and a second duration corresponding to a second precharge period of time, then to a gradual increase at a second rate until a second coupling period of time is expired, and then to a drop to such a level as to keep the line pressure high enough to maintain torque transmission.

REFERENCES:
patent: 4707789 (1987-11-01), Downs et al.
patent: 4730521 (1988-03-01), Hayasaki et al.
patent: 4748870 (1988-06-01), Sugino et al.
patent: 4807496 (1989-02-01), Hayasaki et al.
patent: 5046178 (1991-09-01), Hibner et al.
patent: 5131295 (1992-07-01), Kodama
patent: 5329830 (1994-07-01), Kitagawa et al.
Service Manual (Publication No. A261C07) "Nissan Full Range Electronically Controlled Automatic Transmission RE4R01A Type" 1987, pp. 1-90.

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