Electric Machine Propulsion Lockout for Unintentional Start Prevention
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Solution Overview
Problem
Existing methods fail to effectively prevent unintentional starts of work-performing machines, which can be safety-critical due to hardware or software errors, especially when there is no driver input but the electric machine is in a propulsion mode.
Innovation Solution
A method that checks for a driving request from the driver and detects the operating mode of the electric machine, determining a safety-critical state if no driver input is detected while the machine is in a propulsion mode, and sends a signal to transition the electric machine to a non-propulsion state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the electric machine is allowed to start automatically when in propulsion mode, then the machine can respond quickly to driving conditions, but unintentional starts may occur due to hardware or software errors causing safety-critical situations
Solution Approach 1:
The control device performs preliminary checks before allowing the electric machine to start. It verifies that a driving request from the driver is present and that the operating mode is appropriate before enabling propulsion, preventing unintentional starts while maintaining quick response when conditions are proper
Solution Approach 2:
The control device continuously monitors the operating mode and driving requests, creating a feedback loop that constantly verifies safety conditions. When the electric machine is in propulsion mode, the system checks for valid driver input and transitions to a non-propulsion state if no driving request is detected, preventing safety-critical situations
2Reliability
If the electric machine transitions to a non-propulsion state when safety-critical conditions are detected, then safety is improved, but the machine loses operational capability
Solution Approach 1:
The control device dynamically adjusts the operating state of the electric machine based on real-time conditions. When safety-critical situations are detected (propulsion mode without valid driving request), the system transitions to a non-propulsion state. When proper driving requests are present, the machine returns to operational propulsion mode, balancing safety with productivity
Data Source
AI summary
A method for preventing an unintentional start of a work-performing machine, wherein the work-performing machine includes an electric machine for propelling the work-performing machine, the method including checking whether there is a driving request from a driver of the work-performing machine and detecting information relating to an operating mode of the electric machine. The method further includes determining, based on the checking in relation to the driving request and the detected operating mode of the electric machine, whether the electric machine is in a safety-critical state and, if it is determined that the electric machine is in the safety-critical state, sending a signal to the electric machine to transition the electric machine to a state not suitable for propulsion.