HYSTAT DRIVE SYSTEM HAVING ENGINE SPEED CONTROL

摘要

A drive system (14) is disclosed. The drive system may have an engine-driven pump (38), and a motor (40) connected to the pump. The drive system may also have a speed input (18) to select a maximum allowable engine speed, a throttle input (20) to indicate a desired speed of the engine as a function of the maximum allowable engine speed, a transmission input (24) to select a desired transmission control setting, and a controller (28) configured to selectively adjust operation of the engine based on the throttle input and to selectively limit the actual engine speed based on the maximum allowable speed. The controller may also select for use a particular relationship between the actual engine speed and a travel speed from a plurality of available relationships based on the desired transmission control setting, and selectively adjust displacements of the pump and motor based on the actual engine speed and the selected particular relationship.