Electric Power Steering Damper Damage Detection
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Solution Overview
Problem
Damage to electric power steering (EPS) systems often goes undetected after collisions, as existing systems lack effective methods to assess damage to components like dampers, which can be impacted by external forces.
Innovation Solution
An EPS system that includes a steering rack with dampers coupled to its ends, equipped with a steering angle sensor and an electronic controller to detect damage by comparing steering angle data to a threshold, and optionally featuring an electrical circuit within the dampers to send signals to the controller for damage determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional EPS systems are used without damage detection mechanisms, then the system structure remains simple, but damage to components goes undetected after collisions
Solution Approach 1:
The patent applies preliminary action by pre-installing dampers with electrical circuits inside the EPS system components. These circuits are prepared in advance to detect impact forces before actual damage occurs. When a collision happens, the pre-positioned sensors immediately detect the impact and send signals to the controller, enabling timely damage detection without requiring complex post-collision inspection systems.
Solution Approach 2:
The patent uses dampers as intermediary elements between external impact forces and the EPS control system. The dampers absorb impact forces and contain electrical circuits that convert mechanical impact into electrical signals. This intermediary mechanism translates physical damage indicators into detectable electrical signals that the controller can process, bridging the gap between mechanical impact and electronic detection without requiring direct sensor placement on all components.
2Reliability
If dampers with electrical circuits are installed to detect impact forces, then damage detection capability is improved, but the complexity of the damper structure increases
Solution Approach 1:
The patent merges the damper's mechanical shock-absorbing function with an electrical detection function into a single integrated component. The electrical circuit is embedded within the damper structure, combining two previously separate functions (mechanical damping and electrical sensing) into one unified element. This reduces overall system complexity by eliminating the need for separate sensors and wiring harnesses that would otherwise be required.
Solution Approach 2:
The damper is designed with multi-functionality, serving both as a mechanical shock absorber and as an impact detection sensor. The same component that protects the EPS system from impact forces also contains the electrical circuit that detects and reports those forces. This universal design allows a single component to fulfill multiple roles, reducing the total number of parts and simplifying the overall system architecture.
Data Source
AI summary
An electric power steering system. The system includes a steering rack having a first end and a second end and at least one damper coupled to one of the first end and the second end. The system also includes an electronic controller configured to determine if the damper has been destroyed based upon a sensed steering angle being above a maximum steering angle threshold or based upon a received signal from an electrical circuit enclosed within the at least one damper.