Electronic Ignition Interface for Lawn Mowers Using Code Entry
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Solution Overview
Problem
Conventional ignition systems for larger outdoor power equipment, such as riding lawn mowers, rely on key-operated switches, which provide a limited user interface and lack additional functionality, hindering operator convenience and equipment utilization.
Innovation Solution
An electronic ignition system with processing circuitry that defines multiple operating modes, allowing operators to start and control the engine without a physical key, using code entry keys to shift between starting and running modes, and incorporating a user interface with light indicators and function buttons for intuitive operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a key-operated switch is used for ignition, then the starting function is reliable, but the user interface is limited and additional functionality is lost
Solution Approach 1:
The ignition interface is transformed from a simple key-operated switch into a multi-functional electronic control unit that can perform starting, code entry, and various operational mode selections. The processing circuitry enables the same interface to handle multiple functions that would otherwise require separate controls, thereby improving versatility without proportionally increasing complexity.
Solution Approach 2:
The mechanical key-operated switch is replaced with an electronic ignition interface that uses processing circuitry and electronic signals. This substitution eliminates the need for physical keys while enabling digital code entry and electronic control of multiple functions, significantly expanding user interface capabilities.
2Ease of operation
If code entry keys are added to enable keyless operation, then user convenience is improved, but the ignition interface complexity increases
Solution Approach 1:
The mechanical key insertion and turning action is replaced with electronic code entry through buttons or keypad. This substitution improves ease of operation by eliminating the need for physical keys while the electronic implementation integrates seamlessly with the existing processing circuitry, minimizing the increase in overall system complexity.
Solution Approach 2:
The system provides self-service functionality by enabling operators to start the engine and select operating modes through code entry without requiring external keys or additional mechanical components. The processing circuitry handles authentication and mode selection automatically, reducing the need for complex mechanical ignition mechanisms.
3Adaptability or versatility
If multiple operating modes are implemented, then equipment utilization is maximized, but the control system complexity increases
Solution Approach 1:
The ignition interface is designed as a universal control unit that handles multiple operating modes (starting mode, running mode, and various functional modes) through a single integrated processing circuitry system. This approach enables the equipment to perform diverse functions while maintaining a unified control interface, thereby improving versatility without requiring separate control systems for each mode.
Solution Approach 2:
The ignition interface dynamically adapts its functionality based on the current operating mode. The processing circuitry automatically adjusts available functions and interface behavior according to whether the system is in starting mode, running mode, or other operational states, enabling versatile operation while keeping the control logic manageable through state-dependent behavior.
Data Source
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AI summary
A lawn care device may include an engine to selectively power the device, a frame supporting the engine and an operator of the device, and an ignition interface having processing circuitry configured to define a plurality of operating modes. The operating modes may include at least a starting mode in which the ignition interface is usable by the operator to start the engine, and a running mode in which the engine is running. The ignition interface may include code entry keys configured to, responsive to entry of a code via the code entry keys, enable use of the ignition interface to shift from the starting mode to the running mode without a physical starting key.