Engine Control Ignition Timing via Expected Air Amount
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing engine control systems face challenges in preventing knocking when sudden changes in intake air occur, particularly due to rapid accelerator pedal operations, as they rely on slow ignition timing adjustments that fail to accurately account for rapid air amount variations.
Innovation Solution
An engine control method that calculates an expected air amount by monitoring engine operation data, including crank position and rotation speed, to determine an optimal ignition timing, thereby preventing or reducing knocking by accurately managing fuel injection and ignition timing based on expected air conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the ignition timing is advanced to increase the output torque of the engine, then the output torque is improved, but knocking may occur
Solution Approach 1:
The controller calculates the expected air amount in advance based on the current air amount and its change rate before determining the ignition timing. This preliminary calculation allows the system to anticipate future air amount conditions and adjust ignition timing proactively, preventing knocking before it occurs while maintaining optimal torque output
2Object-affected harmful factors
If the ignition timing is controlled slowly to prevent knocking, then knocking is reduced, but knocking may occur due to sudden and rapid change of intake air amount when the accelerator pedal is depressed suddenly
Solution Approach 1:
The controller dynamically adjusts the ignition timing based on the calculated expected air amount, which incorporates the change rate of the air amount. This dynamic adjustment mechanism allows the system to respond rapidly to sudden accelerator pedal operations while maintaining knock prevention, as the ignition timing is continuously optimized based on real-time air amount trends
3Device complexity
If the ignition timing depends on the measured air amount, then the control is simple, but the ignition timing may not accurately reflect the actual air amount at the critical combustion moment
Solution Approach 1:
The controller introduces an intermediate calculation step by computing the expected air amount based on the current air amount and its change rate. This intermediary value serves as a more accurate representation of the air amount at the critical combustion moment, bridging the gap between simple measurement and precise timing control without significantly increasing system complexity
Data Source
AI summary
A method for controlling an engine of a vehicle includes: monitoring, by a controller, engine operation data including a crank position and an engine rotation speed; obtaining, by the controller, a measured air amount flowing into to a specific cylinder; calculating, by the controller, an expected air amount at an intake valve closing time based on the measured air amount; calculating, by the controller, a fuel amount based on the expected air amount; calculating, by the controller, an ignition timing based on the engine rotation speed and the expected air amount; and injecting, by the controller, the calculated fuel amount and performing ignition at the ignition timing.