Automotive drive control for hydrostatic transmission

Details Automotive drive control for hydrostatic transmission Automotive drive control for hydrostatic transmission

1995-03-16

1996-04-02

Gluck, Richard E.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

4172221, 60444, F04B 126

Patent

active

055035345

ABSTRACT:
A control (27)is disclosed which may be used as an automotive drive control for a variable displacement hydrostatic pump (11). The pump displacement is controlled by servos (37, 39) by control pressure from a charge pump (21). As a pedal (P) of a vehicle engine (E) is depressed, an increasing pressure differential across a fixed orifice (79) moves a control spool (73) to port control fluid to a first servo port (A). If engine speed becomes excessive, or in response to an external pressure signal (121) representing another vehicle condition, the control spool (73) is moved to a position (FIG. 5 )in which control pressure is ported to a second servo port (B), thus positively reducing the displacement of the pump (11).

REFERENCES:
patent: 4368798 (1983-01-01), Meyerle et al.
patent: 4382360 (1983-05-01), Dummer
patent: 4388941 (1983-06-01), Riedhammer
patent: 4478041 (1984-10-01), Pollman
patent: 4495767 (1985-01-01), Akiyama et al.
patent: 4559778 (1985-12-01), Krusche
patent: 4747746 (1988-05-01), Geringen
patent: 5108267 (1992-04-01), Horst
patent: 5271722 (1993-12-01), Hansell

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