A pressure control method for a cvt dual pressure hydraulic system

A technology of pressure control and hydraulic system, applied in fluid pressure actuation system components, transmission device control, fluid pressure actuation device, etc., can solve the problem of high energy consumption, achieve the effect of improving operating efficiency and reducing loss

Active Publication Date: 2021-06-25
HUNAN JIANGLU & RONGDA VEHICLE TRANSMISSION LIMITED
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] CVT hydraulic system can be divided into dual-pressure system (ie, dual-pressure hydraulic circuit system) and single-pressure system (ie, single-pressure hydraulic circuit system) according to the dependence of the pressure of the active and passive cylinders. For the single-pressure system, the pressure of the passive cylinder is equal to that of the main oil circuit. Pressure, the pressure of the active cylinder is decompressed to the active cylinder through the proportional pressure reducing valve, therefore, the pressure of the passive cylinder is greater than the pressure of the active cylinder at any time, and under some working conditions, the pressure of the active cylinder must be greater than the pressure of the passive cylinder, so the area of ​​the active cylinder needs to be set The area of ​​the passive cylinder is larger than that of the passive cylinder; for the dual-pressure system, the pressure of the main oil circuit, the pressure of the driving pulley and the passive pulley can be controlled separately, and the pressure of the main and passive cylinders is adjusted through their respective pressure reducing valves. The pressure control is independent, and for the dual-pressure hydraulic system, after professional analysis, it is found that the pressure of the main oil circuit is often greater than the pressure of the passive cylinder and the pressure of the active cylinder, and there is a P line =Max(P sec , P pri )+ΔP, at this time, the main oil circuit pressure is always greater than the maximum value of the passive cylinder and the active cylinder ΔP (the deviation value is in bar, such as 5bar), but the main oil circuit pressure is high, which means There is a problem of high energy consumption during pressure control

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A pressure control method for a cvt dual pressure hydraulic system
  • A pressure control method for a cvt dual pressure hydraulic system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment one: figure 2 It is a pressure control method of a CVT dual-pressure hydraulic system in Embodiment 1 of the present invention. In consideration of saving hardware cost and other reasons, in reality, a pressure sensor is often installed at the passive pulley, but not at the driving pulley ( figure 2 represents such a common situation), since the pressure control means of the present invention cannot perform closed-loop control of the main oil circuit pressure control valve based on the target pressure of the active cylinder, so at this time only the target pressure of the passive cylinder P sec Considered as the maximum target pressure Max(P sec , P pri ), and perform closed-loop control or full-open control on the passive cylinder pressure control valve 16 to suppress the pressure of the main oil circuit of the system and reduce losses. figure 2 During the entire control process of the illustrated Smart Mode, the active cylinder pressure control valve ...

Embodiment 2

[0051] Embodiment two: with figure 2 The first embodiment shown is different. In this embodiment, pressure sensors are installed at the passive pulley and the driving pulley of the CVT dual-pressure hydraulic system. At this time, it is necessary to determine in advance which one is the target pressure of the active cylinder or the target pressure of the passive cylinder. is larger, and select the pressure control valve corresponding to the maximum value as the controlled control valve, and the pulley controlled by the controlled control valve is regarded as the controlled pulley (that is, if the target pressure of the active cylinder is greater than the target pressure of the passive cylinder, the active cylinder cylinder pressure control valve as the controlled control valve, otherwise, the passive cylinder pressure control valve as the controlled control valve), and its corresponding target pressure as the controlled target pressure; as for the other pressure control valve,...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a pressure control method of a CVT dual-pressure hydraulic system. The control method reduces the pressure of the main oil circuit according to different situations, thereby reducing the loss of hydraulic energy consumption. The target pressure of the hydraulic cylinder and the target pressure of the passive pulley hydraulic cylinder. When the target pressure of the passive cylinder is greater than or equal to a certain value of the target pressure of the active cylinder, the target pressure of the main oil circuit is set to the same value as the target pressure of the passive cylinder. At the same time, the pressure of the main oil circuit From open-loop control to closed-loop control, the target pressure of the passive cylinder is increased by a certain value ΔP on the original basis, the main oil circuit pressure replaces the pressure of the passive cylinder, and the pressure control valve of the passive cylinder does not work. Through the pressure control method of the present invention, the pressure of the main oil circuit can be reduced, thereby improving the efficiency of the transmission.

Description

technical field [0001] The invention belongs to the technical field of automobile automatic transmission control, relates to an automatic transmission pressure control technology, in particular to a pressure control method of a CVT dual-pressure hydraulic system. Background technique [0002] CVT hydraulic system can be divided into dual-pressure system (ie, dual-pressure hydraulic circuit system) and single-pressure system (ie, single-pressure hydraulic circuit system) according to the dependence of the pressure of the active and passive cylinders. For the single-pressure system, the pressure of the passive cylinder is equal to that of the main oil circuit. Pressure, the pressure of the active cylinder is decompressed to the active cylinder through the proportional pressure reducing valve, therefore, the pressure of the passive cylinder is greater than the pressure of the active cylinder at any time, and under some working conditions, the pressure of the active cylinder must...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/662F16H61/00F15B11/028F15B11/16F15B13/06F15B21/02
CPCF15B11/028F15B11/16F15B13/06F15B21/02F16H61/0021F16H61/662F16H2061/0078
Inventor 曹成龙罗威黄生豪王韶峰王刚陆海涵周志程
Owner HUNAN JIANGLU & RONGDA VEHICLE TRANSMISSION LIMITED
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap