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[CN 201610656305.7] Control Method of Full Power Power Switching for Hydro-mechanical Stepless Transmission
[CN 201610656305.7] Hydraulic Mechanical Stepless Transmission Full Power Switching Control Method Title: Hydraulic Mechanical Stepless Transmission Full Power Switching Control Method Application Number: CN 201610656305.7 Applicant: Yanshan University Application Date: 2016-8-12 Patent Type: Invention Application The present invention provides a hydraulic mechanical stepless transmission full power switching control method, including the following steps: the hydraulic mechanical controller monitors the key state parameters such as the speed and pressure of the current segment in real time, and takes the ratio of the speed of the fixed displacement hydraulic component to the input speed as the criterion of the ideal timing of the segment change. Under the ideal switching timing, the target segment clutch is combined, and the hydraulic machinery enters the pre-stable stage from the current segment; the controller predicts the working state of the target segment according to the key state parameters of the current segment, and plans the displacement adjustment process during the power transition; in the power transition phase, according to the planned displacement adjustment process, by adjusting the displacement of variable displacement hydraulic components, the power transition is realized by actively controlling the pressure release and pressure build-up process of the high and low pressure sides of the closed hydraulic circuit. After the power transition is completed, the change section enters the post-stabilization phase; finally, the clutch of the current section is disengaged, the change section is completed, and the hydraulic machinery enters the target section. The use of this segment change control method enables the hydraulic machinery to complete the segment change in the overlap of the two clutches, to achieve a smooth transition from the current segment to the target segment, and to transmit power normally during the segment change process, to achieve full-power power segment change.
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