Warm-up control for transmission hydrostatic unit

Details Warm-up control for transmission hydrostatic unit Warm-up control for transmission hydrostatic unit

1989-06-12

1990-08-28

Look, Edward K.

Power plants

Pressure fluid source and motor

Condition responsive control means responsive to, or...

60394, 60464, F16H 5972

Patent

active

049514660

ABSTRACT:
To inhibit potentially damaging cold startup of a hydrostatic unit in a vehicle transmission, a portion of the makeup fluid pump to the hydraulic pump and motor loop circuit of the hydrostatic unit is directed through a branch line including a viscosity insensitive, flow regulating fluidic element and a viscosity sensitive fluidic element. The latter element develops a fluidic signal varying as a function of fluid viscosity, which is utilized to control a valve to prevent over-pressurization of the loop circuit and to control a transmission controller to condition the transmission to neutral until the hydraulic fluid warms to a safe operating viscosity.

REFERENCES:
patent: Re29672 (1978-06-01), Van Gerpen
patent: 2906518 (1959-09-01), Kelley
patent: 3922856 (1975-12-01), Bosch
patent: 4047578 (1977-09-01), Appleman
patent: 4126993 (1978-11-01), Grattapaglia et al.
patent: 4167853 (1979-09-01), Hamma et al.
patent: 4332134 (1982-06-01), Cochran et al.
patent: 4373869 (1983-02-01), Appleman
patent: 4426194 (1984-01-01), Pollman

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