Hitachi Automotive Systems has developed a new electronic control technology for semi-active suspension. Using this technology, it is possible to reduce the posture change of the vehicle by about 10% in the case of vehicle vibration, turning, and the like while traveling.
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Hitachi Automotive Systems Co., Ltd. stated that in semi-active suspension, if the spring's flexibility is increased in order to reduce vehicle vibration, the function of maintaining the balance of the vehicle body during cornering and the like is reduced, thereby improving ride comfort and driving stability. Sex is a subject that is facing. This time, the company developed an algorithm that analyzes the vibration and tilt of the vehicle with higher accuracy than before, making it possible to flexibly control the spring expansion of the semi-active suspension.
Specifically, an algorithm has been developed that includes more quantitative indicators that affect vehicle vibration, that is, rate of change in acceleration, to improve ride comfort. At the same time, the operation of the vehicle with high running stability is formulated, and an algorithm that can reproduce these actions is developed to improve driving stability. By embedding these two algorithms in the electronic control unit of the semi-active suspension, smooth ride comfort and improved driving stability can be achieved.
Moreover, the number of sensors equipped to detect the condition of the vehicle provided to control the action of the semi-active suspension is also reduced. The number of sensors commonly used is seven, and the Hitachi Automotive system achieves performance comparable to the past by using a technology that accurately estimates the state of the vehicle, using only four sensors, thus reducing costs.
In addition, Hitachi Automotive Systems introduced the details of the technology at the SAE 2015 World Congress in Detroit, USA (April 21-23, 2015).
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