Warm-up control for transmission hydrostatic unit

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

F - Mech Eng,Light,Heat,Weapons

15

B

138/41.1

F15B 13/02 (2006.01) F16H 39/40 (2006.01)

Patent

CA 2014905

Dkt. No. 35 OR-914 ABSTRACT OF THE DISCLOSURE To inhibit potentially damaging cold startup of a hydrostatic unit in a vehicle transmission, a portion of the makeup fluid pumped 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.

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