Smart Power Running Board Actuator for Localized Step Control
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Solution Overview
Problem
Automotive control systems face challenges with large data transfer demands over local area networks (LAN) when operating multiple vehicle functions simultaneously, particularly in zonal architectures like automatic power steps and running boards, necessitating a smart actuator for local control without continuous ECU communication.
Innovation Solution
A vehicle step arrangement with a local controller connected to an actuator and LAN, capable of receiving data and executing step commands independently, incorporating a calibration file for obstacle detection and speed control, and an ECU for smooth operation and power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a central control system with ECU and LAN is used to control all vehicle functions, then centralized control and coordination are achieved, but data transfer demands become large and system complexity increases
Solution Approach 1:
The control system is segmented into a central ECU and a local controller (zonal module) integrated with the actuator. The local controller handles specific control tasks for the power step/running board locally, while the ECU manages overall vehicle functions. This segmentation reduces LAN data transfer demands and distributes system complexity appropriately.
Solution Approach 2:
The local controller is extracted from the central ECU and integrated directly with the actuator. This extraction enables autonomous local control of the power step function, eliminating the need for continuous communication with the central ECU and reducing the burden on the LAN.
2Reliability
If continuous communication with ECU over LAN is maintained for control, then centralized monitoring and coordination are preserved, but communication demands increase and response time may be delayed
Solution Approach 1:
The local controller is pre-programmed with control algorithms and parameters during system initialization or manufacturing. This preliminary configuration enables the local controller to execute control commands autonomously without waiting for real-time instructions from the ECU, significantly reducing response time while maintaining reliable operation.
3Productivity
If a smart actuator with local controller is implemented, then local control capability and reduced communication demands are achieved, but device complexity at the actuator level increases
Solution Approach 1:
The local controller is merged with the actuator to form an integrated smart actuator assembly. This merging combines the control functions and actuation functions into a single unified device, improving control efficiency by eliminating communication delays while managing complexity through integration rather than separate components.
Data Source
AI summary
A vehicle step arrangement includes a step connected to a vehicle, capable of moving between stowed and deployed positions. The arrangement further includes at least one actuator connected to a transmission that controls and drives the step's movement. A local controller, connected to both the actuator and the vehicle's local area network (LAN), receives vehicle information data from the LAN and is programmed with step commands to operate the actuator and move the step. The step command from the local controller is generated independent of the LAN, thereby eliminating the need for LAN oversight of all of the functions of the vehicle step arrangement.