EPS is widely welcomed by the Chinese market. Why does EPS attract favor?

EPS is the development direction of automobile steering systems. On the one hand, it originates from the guidance of energy conservation and environmental protection policies and regulations. On the other hand, the technology itself belongs to upgraded and trend-based configurations.

Currently, the penetration rate of EPS in the US and European markets is more than 80%, and the domestic market only accounts for about 30%, but it will leapfrog at a double-digit rate every year. Not only electric vehicles are standard, but traditional internal combustion engine cars are also actively using this one. advanced technology.

EPS is widely welcomed by the Chinese market

The core technology of the steering gear has two: one is the material and mechanical transmission system, and the second is the system solution of the electronic appliance. Judging from the segmentation market of the Chinese auto market, although the passenger car market belonging to the passenger vehicle continues to occupy the largest market share, it continues to shrink slightly, while the SUV has maintained a double-digit growth rate for several consecutive years. If we can provide corresponding EPS boosting products, it not only satisfies the needs of customers' products, but also conforms to the current market situation in which SUVs continue to sell.

In China's auto market, the application of electronic assist EPS has been increasing year by year. Compared with traditional steering products, EPS can not only improve the level of steering control, but also can significantly reduce its own weight, improve fuel efficiency and increase mileage.

At present, in the Chinese automobile market, the use of power-assisted products has not yet reached 100% as in Europe and the United States, and there are also some conventional hydraulic or mechanical electronic assistance. Now the country advocates the electrification of automobiles, and the energy consumption and efficiency requirements are very high. The proportion of EPS electric power promotion and popularization will become higher and higher. In this process, along with the trend of electrification and automatic driving, some international component giants Line-assisted power steering products are also at the stage of R&D and engineering prototypes. They must not only lead the current market, but also carry out technological extensions to comply with the development trend of auto-electricity and auto-driving to better serve customers.

Why is EPS favored?

EPS is a power steering system that directly depends on the motor to provide auxiliary torque. It is mainly composed of a torque sensor, a vehicle speed sensor, a motor, a speed reduction mechanism, and an electronic control unit (ECU).

Compared with the HPS (Hydraulic Power Steering), EPS has the following main advantages:

1

Provide assistance only when turning, significantly reducing fuel consumption

The hydraulic power steering system is driven by the engine to the steering oil pump and consumes part of the power of the engine regardless of steering or steering. The EPS is powered by the motor only when it turns, and does not consume energy when it is not turning. Comparing with the hydraulic power steering system, the test showed that when there is no steering, the electric power steering can reduce fuel consumption by 2.5%; when steering, it can reduce by 5.5%.

2

Take into account the low-speed steering lightness and high-speed handling stability

The steering assistance can be adjusted intelligently, and it can take into account the ease of steering at low speeds and the stability of operation at high speeds. The steering assist provided by the hydraulic power steering system cannot be changed with the increase of the vehicle speed, and the assistance provided by the EPS can be adjusted through an intelligent program. At low speeds, the EPS can provide greater steering assistance and achieve lighter steering; as the vehicle speed increases, the steering assist force can gradually decrease, and the steering force will gradually increase when steering, so that the driver feels obvious "road feeling". , improve vehicle stability.

In addition, EPS can also impose a certain additional positive torque or damping torque, so that the steering wheel can accurately return to the middle position at low speed, and can inhibit the oscillation and overshoot of the steering wheel in the process of high-speed return, taking into account the high vehicle, Return to normal performance at low speeds.

3

Realize precise, timely and intelligent control

The direction of automotive development is electrification and smart interconnection. EPS can transmit signals with all related systems of the entire vehicle through electrical signals, thereby realizing accurate, timely and intelligent control.

4

Modular design, small size, cost savings

The direction of automotive development is electrification and smart interconnection. EPS can transmit signals with all related systems of the entire vehicle through electrical signals, thereby realizing accurate, timely and intelligent control.

Improve vehicle safety

All countries in the world are researching intelligent networked vehicles. On the surface, they have nothing to do with the steering gear. However, from the perspective of security, the steering gear must also cooperate with the intelligence of vehicles to improve safety. Safety can be divided into active safety and passive safety. In the automatic driving stage, when danger is found, the vehicle is required to be more than just stop, but also more intelligent. Specifically, it is necessary to analyze the greatest dangers. Through analysis, we choose a strategy with the best safety and the least danger, and it can be realized through autonomous control of the vehicle. This is the participation of automatic steering.

EPS is the core safety system of automobiles. As a subsystem, it will be linked with more electronic control units. At present, some vehicle manufacturers in Europe, America and Japan are doing the design of related control concepts and control modules. ”

The main feature of Advanced Auxiliary Steering System is the automatic avoidance function. When a person or a car suddenly enters the front of the car, the driver may not be able to completely avoid the brakes and steering. The sensor will detect the danger for the first time and the system will automatically and quickly drive the car to avoid collision. In addition, after the emergency avoidance danger is completed, the system will automatically reverse the steering wheel in order to ensure the normal driving and steering of the vehicle, so that the vehicle can quickly return to a safe driving state.

The important function of the EPS is to recover the energy generated during the deceleration of the electric vehicle to the “regenerative braking system” of the battery as much as possible, and the “automatic braking system” that is currently used by many cars to avoid collisions. In order to realize these functions, compared with the conventional braking system, the internal structure reaction is required to be more sensitive, smaller, and lighter in quality. At present, NSK has developed a lightweight, low-energy ball screw for automotive EHB that can play an important role in improving system efficiency and reducing power consumption.

Make parts become the highlight of the vehicle

From a global perspective, the manufacturers of steering gears, whether they are German, Japanese, or domestic brands, are currently growing rapidly. Faced with such fierce competition, how to stand out from competitors and win the favor of OEMs is a question worth considering.

Now that the car is in an era of great change, the technical boundaries of the host plant and parts companies have become increasingly blurred. Some OEMs are increasingly relying on some key component companies to innovate and implement some subsystems, from design to verification and fusion. And integration, this way, the supplier considers more business than the number, but in-depth study of technology, understanding customers, customer service, while forming a complementary with the host plant.

When purchasing a vehicle, users pay attention to the brand of the vehicle, the performance and functions of the vehicle, and the user also pays attention to the brand of the component. This year, there was a car company that specifically indicated in the model briefing session that it had adopted a new generation of EPS for a well-known brand, which was recognized by consumers and was willing to pay for this option.

The international spare parts giants are also working in this direction. On the one hand, relying on technical strengths - friction, to improve transmission efficiency; on the other hand, using superior products to make larger systems or units available to customers and reduce customers Design energy investment in the vehicle. For example, the wheel motor that NSK is currently working on will become a perfect match for electric vehicles (four hub motors plus one central control, all with remote control and high efficiency). If the hub motor and wheels are assembled together to form a system solution To the customer, to enhance the user experience, the market effect will be revealed, it will become the highlight of the vehicle.

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