| 摘要 |
<p>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 (14) and motor (16) loop (18) circuit of the hydrostatic unit is directed through a branch line (44) including a viscosity insensitive, flow regulating fluidic element (46) and a viscosity sensitive fluidic element (50). The latter element (50) develops a fluidic signal (52) varying as a function of fluid viscosity, which is utilized to control a valve (54) to prevent over-pressurization of the loop circuit (18) and to control a transmission controller (24) to condition the transmission to neutral until the hydraulic fluid warms to a safe operating viscosity.</p> |
