Network Actuator Control via Multi-Drop Bus
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Solution Overview
Problem
Existing actuator control systems face challenges in efficiently managing a large number of actuators due to complex wiring and limited feedback information, leading to difficulties in precise control and flexibility in robot design changes.
Innovation Solution
A network-type actuator module control method that allows for flexible packet instruction transfer, removing restrictions on field lengths and reducing delay times, enabling simultaneous and accurate control of multiple actuators through a multi-drop scheme with enhanced communication protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large number of actuators are connected to the actuator control unit, then the robot can perform more complex operations, but the wiring complexity increases significantly requiring 10n wirings for n actuators
Solution Approach 1:
The patent combines multiple separate control units into a single integrated actuator control unit that can manage multiple actuators through a unified control interface. This merging eliminates the need for separate control circuits for each actuator, reducing wiring complexity from 10n connections to a manageable bus-based connection scheme while maintaining the ability to control large numbers of actuators
Solution Approach 2:
The patent introduces a communication bus as an intermediary between the actuator control unit and multiple actuators. This bus-based communication system replaces direct point-to-point wiring with a shared communication medium, allowing multiple actuators to be addressed and controlled through software rather than requiring separate physical control lines for each actuator
2Device complexity
If conventional sensor units are used with limited feedback types, then the system structure remains simple, but it becomes difficult to implement automatic control mechanisms for problems like overcurrent or overheating
Solution Approach 1:
The patent implements comprehensive feedback mechanisms where sensor units provide multiple types of status information including current, voltage, temperature, and operational state to the actuator control unit. This multi-parameter feedback enables the control unit to automatically detect abnormal conditions such as overcurrent or overheating and implement protective control actions without external intervention
Solution Approach 2:
The patent designs sensor units with multi-functional capabilities that can detect various physical quantities (current, voltage, temperature, position) and provide unified digital feedback through standard communication protocols. This universal sensor design allows the same hardware to support both simple structural applications and complex automatic control requirements
3Device complexity
If all signal processing load is concentrated on one actuator control unit, then the control architecture remains centralized and simple, but smooth operation of robots with large numbers of actuators becomes difficult to achieve
Solution Approach 1:
The patent segments the control functions by distributing processing tasks between the actuator control unit and individual actuator modules. Each actuator module contains local processing capability to handle its own control signals and feedback processing, reducing the computational burden on the central actuator control unit and enabling smoother operation of robots with many actuators
Data Source
AI summary
Described herein is a method for controlling a network-type actuator module, and provides a method for controlling a plurality of network-type actuator modules which are connected to a main controller through a multi-drop scheme including the steps of: the main controller transmitting to the actuator module one instruction packet comprising a plurality of IDs; and an actuator module, which corresponds to the ID, transmitting a status packet to the main controller, wherein the actuator module transmits the status packet according to the order of the ID, which is expressed on the instruction packet. Accordingly, unlimited information required from the plurality of actuators can be read from a single transmission of the packet instruction by flexibly expanding limitations due to limitations on the length of each field in accordance with an instruction set and a definition of a parameter.