Compared with traditional hydraulic power steering system, electric power steering system has the following advantages:

1. The motor only provides power during steering, which can significantly reduce fuel consumption

The traditional hydraulic power steering system uses the engine to drive the steering oil pump, which consumes part of the engine power whether steering or not. The electric power steering system is only assisted by the motor when steering, and does not consume energy when not steering. Therefore, the electric power steering system can reduce the fuel consumption of vehicles.

The comparison test with hydraulic power steering system shows that electric power steering can reduce fuel consumption by 2.5% without steering; When steering, it can be reduced by 5.5%.

2. The size of steering power can be adjusted by software, which can give consideration to the portability of steering at low speed and the handling stability at high speed, with good centering performance.

The steering power provided by the traditional hydraulic power steering system cannot be changed with the increase of vehicle speed. This makes the vehicle have good steering portability at low speed, but the steering wheel is too light at high speed, resulting in the phenomenon of steering "floating", and the driver lacks a significant "road feel", which reduces the vehicle stability and driver's sense of safety at high speed.

The power assisted by the electric power steering system can be easily adjusted by software. At low speed, the electric power steering system can provide greater steering power, and provide the steering portability of the vehicle; With the increase of vehicle speed, the steering power provided by the electric power steering system can be gradually reduced, and the steering force required by the driver during steering will gradually increase, so that the driver will feel an obvious "road feel" and improve the vehicle stability.

The electric power steering system can also apply a certain additional return torque or damping torque, so that the steering wheel can accurately return to the middle position at low speed, and can suppress the oscillation and overshoot of the steering wheel during high-speed return, taking into account the return performance of the vehicle at high and low speeds.

3. Compact structure, light weight, good assembly of production line and easy maintenance

The electric power steering system cancels the hydraulic steering oil pump, oil cylinder, hydraulic pipeline, oil tank and other components, and the motor and reduction mechanism can be integrated with the steering column and steering gear, making the whole steering system compact in structure, light in weight, good in assembly on the production line, saving assembly time and easy to maintain.

4. Through the program setting, the electric power steering system is easy to match with different models, and the production and development cycle can be shortened.

Due to the above advantages, electric power steering system has been more and more widely used in recent years.

The electric power steering system is based on the mechanical steering system, which is equipped with a motor, a reduction mechanism, a torque angle sensor, a speed sensor and an ECU.