Automobile continuously variable transmission (CVT) system, and design and control methods thereof

Abstract

The invention discloses an automobile CVT system, and design and control methods thereof. The automobile CVT system consists of a hydraulic torque divider, a CVT, a shift lever controller and an output mechanism, wherein the hydraulic torque divider is a centrifugal-type hydraulic torque divider or an axial flow-type hydraulic torque divider; the design method of the automobile CVT system comprises the following steps of: 1, determining design parameters; 2, determining the structural parameters of the hydraulic torque divider; 3, determining the structural parameters of the CVT; and 4, determining the structural parameters of the shift lever controller and the output mechanism; the CVT process of automobile is automatically finished by adopting a control method combining the following features that automatic adjustment for the actual rotating speed of automobile is realized by means of the operating state of the hydraulic torque divider and that synchronous dynamic feedback and adjustment are performed on the operating state of the hydraulic torque divider by means of the adjustment state and amount of the actual rotating speed of automobile. The automobile CVT system disclosed by the invention is simple in structure, reasonable in design, low in cost, simple in use and operation and convenient for implementation, can realize CVT automatically without any external force, and has stable and reliable working performance.

Description

technical field [0001] The invention belongs to the technical field of continuously variable transmission for automobiles, and in particular relates to a continuously variable transmission system for automobiles and a design and control method thereof. Background technique [0002] Continuously variable transmission refers to a transmission system that can continuously obtain any transmission ratio within the variable speed range. Through continuously variable transmission, the best match between the drive train and the engine operating conditions can be obtained. Common continuously variable transmissions include hydromechanical continuously variable transmission and metal belt continuously variable transmission (VDT-CVT). Among them, CVT technology has only been used in automobiles for more than ten years, but its advantages over traditional manual and automatic transmissions are obvious: 1. Simple structure, small size, few parts and certain cost after mass production I...

AI Technical Summary

Problems solved by technology

Of course, CVT technology also has its weaknesses, such as the transmission belt is easily damaged, unable to bear large loads, etc. These technical difficulties have made it mostly used in small-displacement, low-power cars.

Nowadays, the CVT systems used in the market all have various defects and deficiencies such as complicated working principle, high cost of use, poor use effect, and inability to realize CVT automatically.

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