Sliding Plate Variable Charge Motion System for Tumble Flow Control
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Solution Overview
Problem
Conventional Variable Charge Motion Systems (VCM) for engines can only generate two tumble flow strengths, which limits their ability to enhance combustion speed and thermal efficiency, particularly in gasoline engines employing Atkinson cycles or Exhaust Gas Recirculation systems, necessitating a solution that can continuously control tumble flow strength without hardware additions or extensive design modifications.
Innovation Solution
A variable position shift type VCM system utilizing a sliding plate within the intake port, adjusted by a pulley and actuator controlled by a PWM signal, to continuously vary the strength of the tumble flow based on engine operating conditions, allowing for efficient adjustment of intake flow and enhancing thermal efficiency without additional hardware or design modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a flap-type VCM is used with ON/OFF control method, then the structure is simple, but only two tumble flow strengths can be generated which limits combustion speed enhancement
Solution Approach 1:
The patent converts the static flap structure into a dynamic sliding plate system that can continuously adjust its position along the intake port. The sliding plate moves along a guide wall to vary the intake flow area dynamically, enabling continuous tumble flow strength adjustment from high to low levels according to engine operating conditions, thereby resolving the limitation of fixed two-state control.
Solution Approach 2:
The patent changes the control parameter from binary ON/OFF states to continuous positional parameters. By controlling the sliding plate's position along the guide wall, the system varies the intake flow area and consequently the tumble flow strength continuously. This parameter transformation enables adaptive control matching different engine operating regions.
2Productivity
If the sliding plate moves to block the intake flow, then the tumble flow strength increases, but the interference with air flow increases
Solution Approach 1:
The patent applies local quality by providing a guide wall structure that guides the sliding plate's movement path. The guide wall ensures the sliding plate moves in a controlled manner that generates effective tumble flow while minimizing chaotic air flow interference. The local structural guidance optimizes the interaction between the sliding plate and intake air.
Solution Approach 2:
The system dynamically adjusts the sliding plate position based on engine operating conditions rather than maintaining a fixed blocking position. This dynamic adjustment allows the system to achieve optimal tumble flow strength at each operating point while minimizing unnecessary air flow interference, balancing productivity and harmful factors adaptively.
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 system effectively adjusts tumble flow strength from high to low according to engine conditions, improving thermal efficiency and combustion characteristics by continuously varying the strength of the tumble flow, outperforming conventional ON/OFF methods in terms of efficiency and adaptability.
Implementation Method 1
a sliding plate positioned internal to a pipeline of an intake port connected to a combustion chamber, and slide and moved for inducing a tumble flow with respect to an intake flow of the air which flows the pipeline and entering into the combustion chamber
Data Source
AI summary
A variable charge motion system may include a sliding plate positioned internal to a pipeline of an intake port connected to a combustion chamber, and slide and moved to induce a tumble flow with respect to an intake flow of the air which flows the pipeline and enters into the combustion chamber, wherein the sliding plate is positioned along a guide wall formed in the pipeline.