Patent ID: 8818653
Filing Date: 2014-08-26
Classification: F16H,Y10T

Abstract:
1. A method of engaging a transmission of a series hydraulic hybrid system having an input shaft for receiving power from a prime mover, an output drive shaft, at least one primary hydraulic pump/motor, and at least one secondary hydraulic pump/motor connected to the primary hydraulic pump/motor via a high pressure manifold and selectively connectable to the output drive shaft of the transmission, the method comprising the steps of: calculating a desired speed of the output shaft of the at least one secondary pump/motor via an electronic control; operating the at least one secondary pump/motor at a target speed via the electronic control, the target speed being the desired output shaft speed plus a desired speed dither provided by the electronic control; and engaging the output shaft of the at least one secondary pump/motor with the output drive shaft of the transmission via power transmission components when the target speed is reached within a prescribed speed error threshold; wherein the operating includes regulating the flow of fluid to and from an accumulator that stores pressurized fluid to the at least one secondary pump/motor to achieve the target speed.