Engine Ignition and Air Control for Idle Vibration Reduction
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Solution Overview
Problem
The configuration of internal combustion engines with a 65-degree angle between banks results in a less regular torque trend and significant third-order amplitude, leading to irregular vibrations and noise, particularly at idle speed, necessitating a method to reduce these irregularities.
Innovation Solution
A method involving a control unit that adjusts the ignition advance angles and air quantity for each cylinder based on the rotation angle of the drive shaft to stabilize the torque and pressure trends, using a transducer to monitor shaft speed and a control unit to optimize these parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a V12 configuration with 65 degrees angle between banks is used to reduce overall engine dimensions, then the engine size is reduced, but the torque trend becomes irregular with significant third order amplitude causing vibrations and noise
Solution Approach 1:
The invention changes the operational parameters of the engine by adjusting the ignition advance angles and air quantities for each cylinder bank. Specifically, it modifies the ignition timing (advance angle) and fuel-air mixture composition to compensate for the irregular torque production inherent in the 65-degree V12 configuration, thereby reducing vibrations and noise without changing the physical engine dimensions
Solution Approach 2:
The invention implements a feedback mechanism where the control unit continuously monitors the torque production and dynamically adjusts the ignition advance angles and air quantities based on detected torque values. This closed-loop control system detects deviations from optimal torque production and applies corrective adjustments to maintain smooth operation and minimize harmful vibrations
2Object-generated harmful factors
If the ignition advance angles and air quantities are adjusted to smooth the torque trend, then vibrations and noise are reduced, but the complexity of the control system increases
Solution Approach 1:
The control unit performs multiple functions: it monitors torque production, calculates optimal ignition advance angles, controls fuel injection timing and quantity, and manages air intake. By consolidating these diverse control functions into a single multi-functional control unit, the invention reduces overall system complexity while achieving smooth torque production and minimizing vibrations
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method stabilizes the torque and pressure trends, reducing the amplitude of irregular vibrations and noise by adjusting ignition advance angles and air quantity, resulting in a more consistent torque delivery.
Implementation Method 1
the ignition of the mixture of fuel and fresh air is ignited. This ignition raises the pressure inside the chamber, causing the movement of the piston towards the bottom dead centre
Data Source
AI summary
A method to adjust an internal combustion engine is described, comprising the steps of: i) controlling a first and second adjustment member so as to adjust a first and second quantity of air in a first and second cylinder provided with a first and second piston; ii) operating a first and second ignition member with a first and second advance angle relative to the first and second top dead centre of the first and second piston; iii) processing a value of one of the amplitudes associated with a respective frequency of a driving member; iv) detecting that the amplitude at a corresponding desired frequency exceeds a threshold value; v) reducing the first advance angle; and vi) increasing the first quantity of air so as to maintain the average value of the resulting torque constant at two complete rotations of said driving member.