Oil pressure closed-loop control method and system for continuously variable transmission system
A continuously variable transmission, closed-loop control technology, used in transmission control, fluid pressure actuation system components, fluid pressure actuation devices, etc., can solve problems such as low master/slave pressure, increased oil pump load, and reduced transmission efficiency. , to achieve the effect of improving the ability to cover the dispersion difference, improving the transmission efficiency, and reducing the load of the oil pump
Pending Publication Date: 2022-02-25
柳州赛克科技发展有限公司
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[0003] In the current control strategy, Pline=Max(Psec, Pprim)+△P, where Pline represents the system pressure, Psec represents the slave pressure, Pprim represents the active pressure, and △P represents the differential pressure; since the system pressure does not have a pressure sensor, only Open-loop control cannot achieve accurate closed-loop control. In the application, in order to ensure that the actual pressure of the system is greater than the master / slave pressure, the pressure difference is set comprehensively considering factors such as the manufacturing dispersion of the system pressure control valve and the performance attenuation after durability. △P=5bar, and the increase of the system pressure directly leads to the increase of the load of the oil pump, which leads to the reduction of the transmission efficiency and affects the fuel economy; in extreme cases, 5bar cannot cover the dispersion difference, resulting in low master / slave pressure
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[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0030] The embodiment of the present invention discloses an oil pressure closed-loop control method and system of a continuously variable transmission system, which can reduce the pressure difference ΔP of the system pressure, reduce the load of the oil pump, and improve the transmission efficiency of the continuously variable transmission assembly; Poor ability, avoiding the low master / slave pressure caused by the system pressure control in extreme cases, redu...
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The invention discloses an oil pressure closed-loop control method and system for a continuously variable transmission system, which are applied to the technical field of continuously variable transmission, and are used for feeding back closed-loop control parameters of a driving / driven pressure controller to a system pressure controller, and determining the system pressure according to an actual driving / driven pressure value and the closed-loop control parameters of the driving / driven pressure controller. According to the oil pressure closed-loop control method and system for the continuously variable transmission system, under the condition that a hydraulic system is not provided with a system pressure sensor, an incidence relation between the system pressure and the driving / driven pressure is recognized, closed-loop system pressure control is achieved through the driving / transmission pressure, system pressure closed-loop control is indirectly achieved, and under an existing hardware condition, a contradictory relationship between transmission efficiency improvement and failure is solved.
Description
technical field [0001] The invention relates to the technical field of transmissions, and more specifically relates to a method and system for closed-loop control of oil pressure in a continuously variable transmission system. Background technique [0002] In the hydraulic control system controlled by the independent oil circuit of the continuously variable transmission, the main / slave pressure is controlled by an independent control valve, which can realize the independent precise control of the main / slave pressure and realize the fast speed change response. According to the hydraulic control principle, The system pressure must be greater than the main / slave pressure, otherwise the main / slave pressure will be low, the speed ratio control will deviate, and the steel belt will even slip. [0003] In the current control strategy, Pline=Max(Psec, Pprim)+△P, where Pline represents the system pressure, Psec represents the slave pressure, Pprim represents the active pressure, and ...
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IPC IPC(8): F16H61/00F15B21/02
CPCF16H61/0021F15B21/02F16H2061/0078F16H2061/0015
Inventor 谷城廖振伟刘志军安文波卢师秋唐红云
Owner 柳州赛克科技发展有限公司