Hydraulic pressure control system of infinitely variable transmission
A technology of hydraulic control system and continuously variable transmission, which is applied in transmission device control, components with teeth, transmission device parts, etc., and can solve problems such as poor control accuracy and dynamic adjustment
Active Publication Date: 2020-04-14
SAIC MOTOR
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Problems solved by technology
[0004] However, in the existing dual-pump hydraulic control system, the main reference factor for the switching of the oil pump is the pressure of the cooling and lubricating oil circuit, which is usually a fixed value, so it cannot be dynamically adjusted according to actual needs, and the control accuracy is poor.
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[0055] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0056] Please refer to figure 1 , figure 1 It is a hydraulic principle diagram of a specific embodiment of the hydraulic control system of the continuously variable transmission provided by the present invention.
[0057] In this embodiment, the hydraulic control system of the continuously variable transmission includes a double-outlet oil pump 11, and the two oil outlets of the double-outlet oil pump 11 are connected to the main oil circuit; specifically, the double-outlet oil pump 11 is a mechanical pump driven by the engine. Pump the hydraulic oil in the oil tank to the main oil circuit.
[0058] The pressure of the main oil circuit is regulated by the main oil circuit pressure regulating valve 21, and the oil inlet of the main...
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The invention discloses a hydraulic control system of an infinitely variable transmission. The system comprises a dual-outlet oil pump, two oil outlets of the dual-outlet oil pump are connected with amain oil way, a main oil way pressure adjusting valve used for adjusting pressure of the main oil way, an oil pump switching valve used for switching the work mode of the dual-outlet oil pump, a first electromagnetic valve with the output end connected to a first control end of the oil pump switching valve and a controller used for adjusting the output end pressure of the first electromagnetic valve according to the vehicle running state are further included, the second control end of the oil pump switching valve is connected with an oil draining opening of the main oil path pressure adjusting valve, and the first control end and the second control end of the oil pump switching valve are oppositely arranged. According to the hydraulic control system, according to the actual work conditionof an engine, work states of a dual pump can be adjusted, and control precision is high.
Description
technical field [0001] The invention relates to the technical field of transmissions, in particular to a hydraulic control system of a continuously variable transmission. Background technique [0002] Continuously variable transmission (CVT for short) is more and more recognized by the market because of its comfort, economy and power. The hydraulic control system is the core component of the continuously variable transmission, which is mainly responsible for providing pressure for each actuator and realizing power transmission and speed ratio changes. [0003] In the existing CVT, in order to reduce the energy consumption of the hydraulic system and improve the efficiency of the CVT, a dual-pump hydraulic control system is designed. The dual-export oil pumps work simultaneously to provide high-pressure oil to the hydraulic system. When the engine is running at high speed or the flow demand is low, Controlling the switching of the oil pump switching valve makes the double ou...
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Login to View More IPC IPC(8): F16H61/40F16H57/04
CPCF16H57/0412F16H57/0434F16H61/40
Inventor 孙光辉张涔涔方伟荣雷太奇徐旭初
Owner SAIC MOTOR