Multi-mode electromechanical continuously variable transmission device and control method

Abstract

A multi-mode electro-mechanical variable speed transmission, includes an input shaft (Input), an output system (Output), at least one planetary gear set having at least three branches each representing a co-axial rotating member, two electric machines (EM1, EM2) along with the associated controllers for the electric machines, and at least a clutch (CL). The first branch couples to the first electric machine (EM1) with a constant speed ratio, the second branch couples to the output system (Output) with a constant speed ratio, the third branch couples to the input shaft (Input) with a constant speed ratio, and the second electric machine (EM2) selectively couples to two different branches of the planetary gear set with two different constant speed ratios, respectively. Said multi-mode electro-mechanical variable speed transmission is capable of providing multiple operation modes including two electric drive modes and two power split operation modes. Different operation modes cover different speed ratio regimes and are suitable for different power requirements. At the mode switching point, the corresponding clutch is automatically synchronized. This avoids shock loads during operation mode switching. The transmission is capable of providing operations with at least a fixed output to input speed ratio.

Description

technical field [0001] The invention belongs to a multi-mode electromechanical stepless transmission device in a power transmission system and an operation method thereof. It can be widely used in various vehicles and power equipment. Background technique [0002] In order to reduce fuel consumption and emissions, hybrid vehicles combine two different forms of energy drive, electric drive and traditional internal combustion engine (also known as engine) drive. Internal combustion engines have a certain range of speed and power, and they work best within a small range. However, the actual road conditions are ever-changing, not only in the speed of the driving wheels, but also in the torque required by the driving wheels. Therefore, the speed and torque of the internal combustion engine, that is, the matching of the power state of the internal combustion engine and the power state of the driving wheel is one of the primary tasks of the transmission. [0003] In recent years...

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Problems solved by technology

Therefore, THS is not suitable for pure electric drive under high power

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