RPM Threshold Capture for Spark-Ignition Engines
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Solution Overview
Problem
Existing methods for capturing RPM thresholds in high-performance vehicles, especially with nitrous oxide injection systems, are hazardous and inefficient, requiring engines to reach redline RPM under load, which can lead to engine damage and pose safety risks during setup.
Innovation Solution
A method that allows users to safely capture RPM thresholds at a lower, unloaded engine speed, using a single button and indicator, independent of tachometry signal configuration or rate, eliminating the need for complex setups and reducing hardware requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RPM thresholds are captured at redline RPM under load using traditional methods, then accurate threshold capture is achieved, but engine damage risk and safety hazards increase
Solution Approach 1:
The patent applies preliminary action by capturing RPM thresholds at a safe, lower RPM (approximately half of the desired threshold) before the engine reaches dangerous redline conditions. The method calculates the actual threshold from this preliminary capture at a reduced RPM, thereby achieving accurate threshold setting without exposing the engine to damaging high-RPM unloaded conditions.
2Ease of operation
If traditional RPM capture methods are used, then RPM thresholds can be set, but complex hardware setups and multiple components are required
Solution Approach 1:
The patent implements self-service by using the vehicle's existing tachometer display as part of the capture process. The user simply observes the tachometer needle position or digital display during the capture procedure, eliminating the need for external tachometers or complex measurement equipment. The system uses readily available vehicle instruments to complete the threshold setting process.
3Manufacturing precision
If RPM thresholds are captured at high RPM under load, then accurate shift points are established, but setup time and engine stress increase
Solution Approach 1:
The patent applies preliminary action by performing the RPM capture at a lower, safer RPM that can be achieved quickly without prolonged engine stress. The method then calculates the actual high-RPM threshold from this preliminary low-RPM capture, significantly reducing the time required for setup while avoiding the need to sustain high-RPM conditions during the threshold setting process.
4Ease of operation
If traditional capture methods requiring engine loading are used, then RPM thresholds can be captured, but safety risks during setup increase
Solution Approach 1:
The patent applies preliminary action by capturing the RPM threshold at a safe, pre-determined lower RPM (approximately 50% of the desired threshold) before any dangerous conditions arise. This preliminary capture at reduced RPM maintains operational simplicity while eliminating the safety risks associated with capturing thresholds at high engine speeds under unloaded conditions.
Data Source
AI summary
A method for safely capturing an engine RPM threshold in a spark-ignition internal combustion engine which may exceed the maximum safe unloaded RPM for that engine. Typical engines having a safe RPM high speed redline when coupled to a load, and a reduced RPM redline when decoupled and unloaded, can be set to activate ancillary equipment at a high redline, engine loaded RPM by deriving and processing data from the engine at a low, unloaded reduced RPM speed. The method requires operator reference to an existing OEM or after-market tachometer which enables the user to set a low RPM reference point while the engine is unloaded and running at a slow RPM. Raw data from the latter low RPM reference point selected by a user is safely captured to form a raw threshold while the engine is operating unloaded, and a higher RPM operating threshold is calculated and set from the raw threshold. The higher RPM operating threshold may exceed the maximum safe unloaded RPM for said engine.