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Electric power-assisted steering system with VTMS (Variable Transmission Motor System) speed variable transmission ratio

A technology of electric power steering and variable transmission ratio, applied in the direction of electric steering mechanism, electric components, mechanical steering gear, etc., can solve the problems of high assembly and manufacturing precision, complex system mechanism, cumbersome control algorithm, etc., to improve safety and speed change The process is simple and the effect of eliminating the need for a mechanical transmission system

Active Publication Date: 2011-02-16
ZHUZHOU ELITE ELECTRO MECHANICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current variable transmission ratio technology of the steering system is based on the planetary gear transmission transmission system. This system has complex mechanism, high assembly and manufacturing precision, cumbersome control algorithm and high cost.

Method used

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  • Electric power-assisted steering system with VTMS (Variable Transmission Motor System) speed variable transmission ratio
  • Electric power-assisted steering system with VTMS (Variable Transmission Motor System) speed variable transmission ratio
  • Electric power-assisted steering system with VTMS (Variable Transmission Motor System) speed variable transmission ratio

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In embodiment one:

[0030] When it is detected that the wheel speed signal 19 is 0 or the speed is very low, turn the steering wheel 1, the motor stator winding 22 rotates in opposite directions around the permanent magnet rotor 23, the output of the motor angle signal 13 is a forward speed signal, and the wheel speed signal 19 gradually changes. small, the motor stator winding 22 rotates in opposite directions around the permanent magnet rotor 23, and the speed of the motor stator winding 22 gradually increases, the output speed signal of the motor angle signal 13 also becomes higher, and at the same time, the angular transmission ratio of the steering system decreases, and the steering becomes more and more The more direct, the less steering travel, making for more responsive steering in place and at low speeds.

Embodiment 2

[0031] In the second embodiment:

[0032] When it is detected that the wheel speed signal 19 is at a high speed, the steering wheel 1 is rotated, and the motor stator winding 22 rotates in the opposite direction around the permanent magnet rotor 23. The rotational speed of the winding 22 around the permanent magnet rotor 23 is also gradually increased, and the output rotational speed signal of the motor angle signal 13 is enhanced. At the same time, the angular transmission ratio of the steering system is getting larger and larger, and the steering is more indirect, so that the steering of the car at high speed is more stable and improves the speed. Car driving safety.

Embodiment 3

[0033] In embodiment three:

[0034] When it is detected that the wheel speed signal 19 is at a medium speed, turn the steering wheel 1, the motor stator winding 22 is relatively stationary around the permanent magnet rotor 23, the VTMS 5 is in a locked-rotor state, the output of the motor angle signal 13 is about 0, and the VTMS 5 does not turn. It is gear changing function; when VTMS 5 breaks down, the relay 27 pushes the clutch 26 to engage, and the steering action is transmitted from the intermediate transmission shaft 4 to the output shaft 25. The entire steering system will not have the function of variable transmission ratio, but the steering system can still work .

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Abstract

The invention relates to an electric power-assisted steering system with VTMS (Variable Transmission Motor System) variable speed transmission ratio and provides an electronic controlled electric power-assisted steering stability safety device which is realized by arranging a VTMS between a steering wheel and a transmission shaft and connecting an electric power-assisted steering system with variable transmission ratio, wherein the VTMS consists of eight basic parts of a middle transmission shaft, a motor angle sensor, a motor stator coil, a rotor permanent magnet, a stator framework, an output shaft, a protection shaft sleeve and a relay. In the invention, by monitoring various signal values of the VTMS, the torque quantity of a steering column of a vehicle can be worked out, thereby omitting torque sensors, torque bars and other crucial parts used in traditional technology and achieving the advantages of cost saving and simple assembling and manufacturing; in addition, during the process of steering, the VTMS and a power-assisted motor are under flexible control and mutually compensate, and therefore, the sensitivity, the portability and the stability of steering can be combined perfectly, and the operation performance and the safety can also be improved.

Description

technical field [0001] The present invention relates to a steering mechanism, in particular to a VTMS (Variable Transmission Motor System, variable transmission ratio motor system for a steering system) electric power steering system with variable transmission ratio with speed. Background technique [0002] The existing electric power steering system is developed from the original traditional mechanical steering system. The angular transmission ratio of the traditional mechanical steering system is fixed. At present, the electric power steering system cannot change the angular transmission ratio of the steering system. It can only reduce the Steering torque, therefore can not utilize reducing steering stroke (steering angle) to reduce driver's labor intensity when parking in place at low speeds, cannot meet the requirement of steady steering (low sensitivity) at high speeds. [0003] In other words, the steering angle ratio of the steering wheel to the front wheels is always...

Claims

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Application Information

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IPC IPC(8): B62D3/04H02K7/10B62D5/04
Inventor 高明陈奇志付伟赵斌张宝明
Owner ZHUZHOU ELITE ELECTRO MECHANICAL
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