Engine Speed Governor Ignition Skipping Control
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Solution Overview
Problem
Existing engine control systems struggle to maintain engine speed below a certain threshold efficiently, particularly in light-duty combustion engines, especially when transitioning between idle and throttle modes, leading to potential engine damage from excessive speed.
Innovation Solution
A method and system that utilize an engine speed governor to limit engine speed by skipping ignition events and adjusting ignition timing, coupled with a control system that determines engine mode through throttle valve actuation detection and speed threshold comparisons, ensuring the engine operates within safe speed limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine speed governor limits the engine speed by skipping ignition events, then the engine speed is maintained below the threshold, but the productivity and power output are reduced
Solution Approach 1:
The engine speed governor dynamically adjusts ignition timing and skips ignition events based on real-time engine speed measurements. The control system continuously monitors engine speed and modifies ignition patterns to maintain speed below the threshold while minimizing impact on power output during transient conditions
Solution Approach 2:
The governor applies periodic skipping of ignition events rather than continuous suppression. By selectively skipping ignition events at controlled intervals and using pulse-width modulation of the ignition system, the system maintains average engine speed below the threshold while preserving power output during periods when ignition events are not skipped
2Power
If the engine operates at high speed, then the power output increases, but the engine may exceed safe speed limits and suffer damage
Solution Approach 1:
The engine speed governor implements a closed-loop feedback control system that continuously measures engine speed and adjusts ignition timing and event frequency accordingly. When engine speed approaches the threshold, the governor increases the frequency of skipped ignition events to bring speed back below the limit, preventing excessive speed and potential damage
Solution Approach 2:
The governor anticipates potential speed excursions by proactively skipping ignition events before the engine speed can reach dangerous levels. The control system uses predicted engine behavior and current operating conditions to preemptively adjust ignition patterns, preventing the engine from exceeding safe speed limits
3Use of energy by moving object
If the ignition timing is advanced for high-speed operation, then the combustion efficiency improves, but the engine speed control becomes more difficult
Solution Approach 1:
The control system dynamically adjusts ignition timing based on real-time engine speed and load conditions. At high speeds, the governor advances ignition timing to maintain combustion efficiency, while simultaneously coordinating ignition event skipping to control overall engine speed. The system continuously adapts ignition parameters to balance combustion efficiency with speed control requirements
Solution Approach 2:
The governor changes multiple ignition parameters simultaneously, including ignition timing advance angle, ignition event frequency, and spark duration. By coordinating changes in these parameters, the system maintains combustion efficiency through timing advancement while using event frequency reduction to control engine speed, managing the complexity through integrated parameter control
Data Source
AI summary
In at least some implementations, a method of maintaining an engine speed below a first threshold, includes: (a) determining an engine speed; (b) comparing the engine speed to a second threshold that is less than the first threshold; (c) allowing an engine ignition event to occur during a subsequent engine cycle if the engine speed is less than the second threshold; and (d) skipping at least one subsequent engine ignition event if the engine speed is greater than the second threshold. In at least some implementations, the second threshold is less than the first threshold by a maximum acceleration of the engine after one ignition event so that an ignition event when the engine speed is less than the second threshold does not cause the engine speed to increase above the first threshold.