Patent ID: 6409628
Filing Date: 2002-06-25
Classification: B60W,F16H,Y10T

Abstract:
A transmission assembly, comprising:a continuously variable transmission driven by an input shaft at an input speed; a mechanical transmission coupled to the continuously variable transmission for selecting a first gear range and a second gear range; an output shaft driven by the mechanical transmission at an output speed; and a controller operable to (i) receive a speed command and generate a transmission ratio command which control a ratio of the output speed to the input speed, and (ii) generate a shift command which causes the mechanical transmission to shift from the first gear range to the second gear range, wherein: an upper transmission ratio limit defined by an engine lug limit, a lower transmission ratio limit is defined by an engine overspeed limit, the controller causes the transmission to execute a shift from the first gear range to the second gear range which causes an instantaneous change in output speed, and the engine lug limit or the engine overspeed limit are adjusted to inhibit a subsequent shift from the second gear range to the first gear range.