EV Activation Sequence With Wake State and Propulsion Lockout
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Solution Overview
Problem
Electric vehicles are challenging to activate due to their quiet operation, making it difficult for operators to perceive the vehicle's state during start-up, unlike internal combustion engine vehicles where engine sound indicates readiness.
Innovation Solution
A method and system that utilize a two-command sequence via an operator input device to transition an electric vehicle from an inactive state to a wake state and then a ready state, including visual indications and conditional propulsion authorization, with regenerative braking in the wake state to prevent unintended movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If electric vehicles operate quietly to reduce noise pollution, then environmental friendliness is improved, but operator awareness of vehicle state deteriorates
Solution Approach 1:
The patent introduces visual indicators (lights, displays) as intermediary elements to convey vehicle state information to the operator. These indicators serve as a mediator between the quiet electric motor and the operator, providing awareness without requiring acoustic signals. The system uses colored lights and graphical representations on displays to communicate vehicle status, replacing the acoustic feedback function traditionally provided by engine noise.
Solution Approach 2:
The patent replaces the acoustic feedback mechanism (engine sound) with visual feedback mechanisms (lights, displays). Instead of relying on mechanical/acoustic phenomena to convey vehicle state, the system uses electrical/optical components to provide information to the operator, substituting one sensory modality for another more suitable to electric vehicle operation.
2Reliability
If a two-command activation sequence is implemented, then safety is improved, but operation complexity increases
Solution Approach 1:
The patent segments the vehicle activation process into distinct states (off state, wake state, ready state) with specific transition requirements. By dividing the activation sequence into manageable stages with clear visual feedback for each state, the system provides safety through controlled progression while maintaining ease of operation through intuitive visual guidance. Each state transition is clearly indicated, reducing operator confusion despite the multi-step process.
3Loss of information
If visual indicators are added to show vehicle state, then operator awareness is improved, but device complexity increases
Solution Approach 1:
The patent integrates visual indicators into existing vehicle components, particularly the instrument panel and display systems. These components serve multiple functions: traditional vehicle instrumentation and the new vehicle state indication function. By making existing elements multi-functional rather than adding completely separate indicator systems, the patent reduces overall device complexity while still providing comprehensive visual feedback for vehicle state awareness.
Data Source
AI summary
Methods and systems for activating electric vehicles are provided. One method includes, in response to a first command to activate the vehicle, transitioning the vehicle from an inactive state to a wake state where a controller of the vehicle is activated and the vehicle is prevented from being propelled by an electric motor of the vehicle. The method also includes, in response to receiving a second command to activate the vehicle after receiving the first command, transitioning the vehicle from the wake state to a ready state where the vehicle is permitted to be propelled by the electric motor.