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Electric power-assisted steering system with variable transmission ratio and method for controlling transmission ratio thereof

A technology of electric power steering and transmission ratio, applied in the direction of automatic steering control components, electric steering mechanism, steering mechanism, etc., can solve problems such as oversteering, changing the performance of the steering system, hidden dangers of vehicle handling stability, etc., and achieve variable transmission ratio Effects of Control and Active Steering Interventions

Inactive Publication Date: 2010-06-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] At present, the electric power steering system at home and abroad adopts a fixed transmission ratio, but the fixed transmission ratio is not conducive to changing the performance of the steering system: the steering wheel tends to sink at low speeds; At high speeds, dangerous conditions such as oversteer are prone to occur, and there are hidden dangers in the handling stability of the car.

Method used

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  • Electric power-assisted steering system with variable transmission ratio and method for controlling transmission ratio thereof
  • Electric power-assisted steering system with variable transmission ratio and method for controlling transmission ratio thereof
  • Electric power-assisted steering system with variable transmission ratio and method for controlling transmission ratio thereof

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Embodiment Construction

[0016] Such as figure 1 As shown, a variable transmission ratio electric power steering system consists of a steering wheel 1, a rack 9 connected to the steering wheel 1 through a steering column 5, and a torque sensor 2 located below the steering wheel. The booster motor 7 connected to the rack 9 through the reduction mechanism 8 also includes a steering rocker 10 connected to the rack 9, and also includes an electronic control unit ECU12; it is characterized in that: between the torque sensor 2 and the rack 9 A planetary gear mechanism is installed on the steering column, which is composed of a planetary gear 4, a sun gear 5, and a ring gear 6, wherein: the ring gear 6 is connected to the steering motor 3, and the sun gear is connected to the steering column 5 located below the planetary gear mechanism. The planetary gear 4 is connected with the torque sensor 2 located under the steering wheel 1 .

[0017] Such as figure 2 As shown, a variable transmission ratio control m...

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Abstract

The invention relates to an electric power-assisted steering system with a variable transmission ratio and a method for controlling transmission ratio thereof, and belongs to an electric power-assisted steering system. A planetary gear mechanism and a steering motor are arranged between a torque sensor and a gear rack; and on the basis of completing the conventional electric power-assisted steering, the electric power-assisted steering system can realize the functions of variable transmission ratio control and active steering interference.

Description

technical field [0001] The invention relates to an electric power steering system, in particular to an electric power steering system with a variable transmission ratio, which can realize variable transmission ratio control and active steering intervention functions, and ensure that the road feel of the electric power steering is not affected. Background technique [0002] The electric power steering system is a new and promising power steering system. It completely cancels the hydraulic components. The whole system is composed of a steering wheel torque sensor, a vehicle speed sensor, a controller, a power assist motor and its deceleration mechanism. The basic principle is that the controller receives the steering wheel torque signal and the vehicle speed signal, and after judgment and processing, outputs a control signal according to the pre-determined power boost characteristics, and controls the motor to output power boost torque. [0003] At present, the electric power ...

Claims

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Application Information

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IPC IPC(8): B62D5/04B62D6/00B62D119/00B62D113/00B62D137/00
Inventor 刘顺赵万忠蒋朱龙蔡辉梁荀
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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