Active electric power steering system capable of changing steering system transmission ratio

Abstract

The invention discloses an active electric power steering system capable of changing a steering system transmission ratio, which comprises a steering wheel, a steering column, a steering angle sensor, a torque sensor, a worm gear speed reducer, an assisted motor, a gear rack steering gear, an infinitely variable transmission, a steering angle speed ratio adjustment motor which drives the infinitely variable transmission, a wheel speed sensor, a gyroscope and a steering system controller. The gear ratio control adjustment motor realizes the continuous and smoothly infinite variation of steering transmission ratios at different vehicle speeds, and also can perform steering angle compensation; and in the steering transition of a vehicle, negative steering adjustment is actively performed, and in the steering process, the adjustment motor and the assisted motor perform flexible control and compensate for each other, thereby perfectly combining steering flexibility, convenience and operation stability and improving maneuvering performance and security performance.

Description

technical field [0001] The invention relates to a steering mechanism, in particular to an active electric power steering system with variable transmission ratio of the steering system. Background technique [0002] The existing electric power steering system is developed from the original traditional mechanical steering system. The angular transmission ratio of the mechanical steering system is fixed. At present, the electric power steering system cannot change the angular transmission ratio of the steering system, but can only reduce the steering force. torque, but at low speeds and when parking in situ, the steering stroke (steering angle) cannot be reduced, and the labor intensity of the driver can be reduced, and the requirements for stable steering (low sensitivity) cannot be met at high speeds. [0003] In other words, the steering angle ratio of the steering wheel to the front wheels is always the same whether you are slowing down the narrow streets of the city or run...

AI Technical Summary

Problems solved by technology

If direct steering is used, the driver does not need to turn the steering wheel significantly when passing a sharp bend, but when driving at high speed, the subtle movements of the steering wheel will affect the driving stability; The higher the driving stability on the road, but the handling when cornering must be sacrificed

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