Throttle Body Boost Venturi for Low-Speed Fuel Mixture
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Solution Overview
Problem
Existing fuel and air charge forming systems for combustion engines face challenges in efficiently controlling fuel flow and air mixture at varying engine operating conditions, particularly at low engine speeds and loads, where fuel pooling and inconsistent mixtures can occur due to inadequate airflow and pressure management.
Innovation Solution
The proposed throttle body assembly incorporates a boost venturi, metering valves, and a control module with a pressure chamber and actuator system, which allows for precise control of fuel flow and air induction, using a boost venturi to increase airflow velocity and create a consistent pressure drop for improved fuel-air mixing, even at low engine speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a throttle valve is used to control air flow in conventional systems, then air flow can be regulated, but fuel pooling and inconsistent fuel-air mixtures occur at low engine speeds and loads due to inadequate airflow and pressure management
Solution Approach 1:
The system dynamically adjusts fuel metering based on throttle valve position and engine operating conditions. The metering valve responds to changes in airflow demand by adjusting fuel flow rates in real-time, ensuring consistent fuel-air mixtures across varying engine speeds and loads rather than using fixed metering arrangements
Solution Approach 2:
The system uses feedback from throttle position sensors and engine operating parameters to control the metering valve. This closed-loop control ensures that fuel flow is precisely regulated according to actual airflow conditions, preventing fuel pooling and maintaining mixture consistency particularly at low engine speeds where conventional open-loop systems fail
2Stress or pressure
If high pressure fuel injection is used, then fuel delivery pressure is sufficient, but fuel flow control precision is reduced leading to pooling issues at low flow rates
Solution Approach 1:
The fuel delivery system is segmented into two independent control stages: a high-pressure fuel delivery system that ensures sufficient injection pressure, and a separate low-pressure metering system that provides precise fuel flow control. This segmentation allows each subsystem to optimize its function without compromise
Solution Approach 2:
The metering valve acts as an intermediary component between the high-pressure fuel source and the injection system. It reduces and precisely controls fuel flow pressure and rate before delivery, enabling accurate fuel metering at low flow rates while maintaining the capability for high-pressure delivery when needed
3Quantity of substance
If fuel flow is increased to prevent pooling, then fuel availability is improved, but fuel-air mixture consistency deteriorates due to inadequate airflow management
Solution Approach 1:
The metering valve is controlled by feedback from throttle position sensors and engine operating parameters. This allows the system to precisely match fuel flow quantity to actual airflow demand, increasing fuel flow when needed to prevent pooling while simultaneously adjusting to maintain optimal fuel-air mixture composition across all operating conditions
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
This solution ensures a consistent and efficient fuel-air mixture delivery across a range of engine conditions, preventing fuel pooling and enhancing engine performance by optimizing airflow and pressure management, particularly at idle and low-load operations.
Implementation Method 1
The boost venturi is located in the throttle bore and having an inner passage that is open at both ends to the throttle bore
Implementation Method 2
fuel flows from the pressure chamber to the metering valve under the force of gravity or under a pressure of less than 6 psi
Data Source
AI summary
A throttle body assembly for a combustion engine includes a throttle body having a pressure chamber including a supply of liquid fuel, and a throttle bore with an inlet through which air is received. A throttle valve is carried by the throttle body with a valve head movable relative to the throttle bore. A metering valve is coupled to the throttle body, and has a valve element that is movable between open and closed positions. A boost venturi is located in the throttle bore and has an inner passage that is open at both ends to the throttle bore. The boost venturi has an opening through which fuel flows into the inner passage when the valve element is in the open position, wherein fuel flows from the pressure chamber to the metering valve under the force of gravity or under a pressure of less than 6 psi.