Engine Controller Ignition Timing Feedback for Smooth Deceleration
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Solution Overview
Problem
Existing engine control methods struggle to achieve smooth deceleration due to fluctuations in engine rotation number during deceleration, leading to inadequate responsiveness and optimal engine behavior.
Innovation Solution
An engine working apparatus that includes a controller to adjust ignition timing based on detected rotation number deviations, using feedback control mechanisms such as PI control and map control to maintain target rotation numbers, especially during deceleration conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If feedback control is executed during deceleration to adjust ignition timing, then deceleration smoothness is improved, but the complexity of the control system increases
Solution Approach 1:
The patent implements feedback control by continuously monitoring the actual rotation number during deceleration and adjusting the ignition timing based on the deviation from the target rotation number. The controller executes feedback control when the detected rotation number satisfies predetermined deceleration conditions, comparing actual vs. target values and dynamically adjusting ignition timing to minimize rotation number fluctuations and achieve smooth deceleration.
2Speed
If ignition timing is adjusted based on rotation number deviation, then responsiveness to rotation number changes is improved, but the difficulty of control increases
Solution Approach 1:
The patent employs dynamic control by making the ignition timing adjustable and dependent on real-time rotation number conditions. The ignition timing is not fixed but is dynamically modified based on the current rotation number and its deviation from target values during deceleration. The control system adapts ignition timing in real-time according to changing engine conditions, enabling responsive control while managing complexity through condition-based execution.
3Measurement precision
If feedback control is executed only under predetermined deceleration conditions, then control precision is improved, but the loss of time due to condition checking increases
Solution Approach 1:
The patent applies preliminary action by pre-defining the deceleration conditions that trigger feedback control. The controller is configured to execute feedback control when specific predetermined deceleration conditions are met, rather than continuously executing control under all operating conditions. This approach prepares the control system to act precisely when needed while avoiding unnecessary computational overhead during normal operation, thus balancing precision with time efficiency.
Data Source
AI summary
Provided is an engine working apparatus capable of smoothly decelerating an engine. The engine working apparatus includes: an internal combustion engine including a piston reciprocally movable in a cylinder and a combustion chamber defined by the piston; an ignition plug configured to ignite air-fuel mixture in the combustion chamber; a detector configured to detect a rotation number of the internal combustion engine; and a controller configured to control an ignition timing of the ignition plug based on the detected rotation number, execute feedback control of determining the ignition timing based on a deviation between a target rotation number and the detected rotation number, and to execute the feedback control when the detected rotation number satisfies a predetermined deceleration condition.