Angled Throttle Valve Phase Angle for Engine Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Internal combustion engines with parallel cylinders face inefficiencies due to differing intake and exhaust pipe configurations, leading to unstable combustion and unburned gas generation, especially at low revolutions, as existing synchronized throttle systems fail to account for varying cylinder efficiencies.
Innovation Solution
An intake system with angled throttle valves and a phase angle adjustment mechanism is introduced, allowing for synchronized operation of throttle valves with a phase angle, specifically targeting cylinders with low output during idling to improve combustion efficiency and stabilize engine revolutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all throttle valves are closed at full close position, then the intake passages are completely closed, but the cylinders have mutually different combustion efficiencies leading to unstable revolutions
Solution Approach 1:
The patent applies asymmetry by setting different phase angles for different throttle valves. Specifically, the first throttle valve is positioned at a phase angle of 0 degrees while the second throttle valve is positioned at a phase angle of 180 degrees. This asymmetric configuration ensures that when one throttle valve is fully closed, the other remains open, allowing each cylinder to maintain appropriate intake flow for stable combustion and preventing unstable revolutions.
2Productivity
If the intake pipe and exhaust pipe are elongated and thinned, then inertial forces increase charging and discharging efficiencies, but intake and exhaust resistances increase causing reduction in output
Solution Approach 1:
The patent applies dynamics by making the throttle valves adjustable rather than fixed. The throttle valves can be rotated to different opening degrees, allowing the intake system to dynamically adapt to different operating conditions. At low revolutions, the throttle valves can be positioned to utilize inertial forces for improved charging efficiency, while at high revolutions, they can be opened wider to reduce intake resistance and maintain output.
3Device complexity
If a shared throttle shaft penetrates both throttle bodies, then the structure is simplified and throttle valves rotate simultaneously, but combustion efficiency differences between cylinders cannot be compensated
Solution Approach 1:
The patent applies local quality by giving each throttle valve individual phase angle settings while maintaining a shared throttle shaft structure. The first throttle valve has a phase angle of 0 degrees and the second has a phase angle of 180 degrees. This allows local optimization of each cylinder's intake flow characteristics without requiring separate throttle shafts, thus maintaining structural simplicity while improving combustion efficiency.
Data Source
AI summary
An intake system of an internal combustion engine, in which a phase angle between throttle valves is provided in order to perform combustion appropriate for each cylinder so as to stabilize a number of revolutions and thereby suppress generation of unburned gas, is provided. The intake system is provided to intake passages of an internal combustion engine with parallel cylinders. The intake system includes a power transmission mechanism configured to transmit power from a power source to throttle shafts so as to synchronize and simultaneously turn a plurality of throttle valves and thereby open and close the intake passages. At least one of the throttle valves is an angled throttle valve having a phase angle at an open position relative to the other throttle valve.