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Electric Power Steering

 

Overview

        In the global trend of emission reduction, miniaturization, lightweight, the application of the electric power steering system (EPS) is gradually becoming the mainstream of the automobile steering system technology, especially in the field of new energy and electric passenger cars.

        EPS can provide optimal steering power for the driver according to the automobile steering torque, steering wheel angle, speed and road conditions, etc., making the diversion more easily. It also provides the vehicle with the ability to keep straight driving and inhibit the bumpy road reaction, ensuring the steering feel under various driving conditions.

        Founded in 2006, Hirain EPS R&D is a professional team that has cooperated with several first-class steering system providers. We have successfully develope a high-end EPS control system based on brushless motor and a low-cost EPS control system based on a brush motor, the technology has reached the level of similar products abroad. Our products have already been equipped in the Tri-Ring Group production vehicles.

 

Product lines

•  Brushed Product line

        Power level: 45A, 65A; Suitable for small cars with a front axle load of less than 900kg.For example, the brush-motor-based column-type power assist system shown in the figure below.

 

 

      Basic functions

        ?Provide the driver with variable support,according to the torque and speed of the steering wheel;

        ?Fault diagnosis and failure protection;

        ?Friction and damping compensation;

        ?Multiform calibration;

        ?Power management function.

      Optional functions

        ?Active Return-to-middle Control;

        ?End protection function.

 

•  Brushless product line

        Power level: 80A, 120A; suitable for mid-size cars or SUVs with front axle loads of 700kg-1500kg. For example, the brushless-motor-based column-type power assist system and the rack-type power assist system shown in the figure below.

 

Brushless-motor based R-EPS system and control unit 3D digital model

 

Brushless-motor based C-EPS system and control unit 3D digital model

 

    ♦  Basic functions

        ?Provide the driver with variable support,according to the torque and speed of the steering wheel;

        ?Active Return-to-middle Control;

        ?Fault diagnosis and failure protection;

        ?Temperature and power management functions;

        ?Inertia, damping and friction compensation;

        ?Multiform calibration;

        ?Fluctuation suppression function;

        ?End protection function.

        ?Lock-rotor indication and protection.

 

Advantages

•  A full range of functional safety assessment and design, able to comply with ISO 26262. Standardized processes are strictly followed throughout the product development cycle to meet the high safety requirements of the ASIL-D;
•  Power-assisted algorithm based on model design, superior to similar domestic products, commensurate with foreign EPS products;
•  Non-contact torque sensor using the redundancy signals effectively improve the reliability and longevity of the product;
•  Intelligent control strategy for superior steering feel and a delightful driving experience
•  EPS electronic control products can cover many types of electric power steering systems.

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