Intelligentization of Automotive Power Steering System Innovation: A Patent Based Analysis

As safety, comfort and pleasure of driving are concerned, the properties of the steering system as a relevant subsystem of automobiles, as well as an essential interface with the driver, are of great importance. Power steering system, which has the unparalleled advantages in terms of technology, cost and environmental protection, occupies the majority of present automotive steering system market share. However, with the rapid expansion of new energy vehicles and autonomous vehicles, it is still in doubt that the technological innovation of power steering system is able to meet the future higher requirements. This paper, based on patent portfolio analysis, assesses the innovation of power steering system. The innovation source and focuses of automotive steering systems are unveiled through the dynamic analysis of patent amounts, major patentees and patent classification codes. The findings show that the research and development of automotive power steering technology focuses on power-assisting mechanisms and monitoring devices, considered as two core technologies. Our analysis also shows that intelligentization, such as the motor control and control algorithm design, is the trend of future technological innovation. We believe that power steering system is still absolutely competitive. Our study deepens the understanding of the dynamics of automotive power steering system innovation.