Annular Venturi Vacuum Pump for Vehicle Brake Systems
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Solution Overview
Problem
Existing vehicle systems face challenges in efficiently generating and managing vacuum for vacuum consumption devices, such as brake boosters and purge canisters, due to limitations in throttle-based vacuum generation and the added complexity and cost of using aspirators, which also pose space and packaging constraints.
Innovation Solution
A vacuum generating device with identically shaped upper and lower halves forming an annular venturi passage is used to replenish vacuum, allowing air to flow through the passage and generate vacuum without electronic valves or actuators, adjusting intake air flow based on engine conditions to provide vacuum to consumption devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple control bores are added to utilize vacuum generated at the entire periphery of the throttle, then vacuum supply capability is improved, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The vacuum generation function is segmented from the throttle and assigned to a separate vacuum pump device. This allows the throttle to maintain its primary function while the vacuum pump independently generates vacuum through venturi passages, eliminating the need for multiple control bores in the throttle body.
Solution Approach 2:
A vacuum pump acts as an intermediary device between the intake manifold and vacuum consumption devices. The vacuum pump uses venturi passages to generate vacuum from engine airflow and supplies it to consumption devices, decoupling vacuum generation from the throttle design.
2Quantity of substance
If aspirators are used to generate vacuum, then vacuum supply capability is improved, but device complexity and packaging constraints increase due to multiple components
Solution Approach 1:
The vacuum pump combines multiple aspirator components (nozzle, mixing section, diffusion section, and check valve) into a single integrated device. This consolidation maintains vacuum generation capability while eliminating the need for separate parts and reducing packaging constraints.
Solution Approach 2:
The vacuum pump serves multiple functions: it generates vacuum through venturi passages, controls airflow to the intake manifold, and supplies vacuum to consumption devices. This multi-functionality replaces the need for separate aspirator components and electronic valves.
3Quantity of substance
If aspirators are installed in the intake, then vacuum generation capability is improved, but space availability and packaging flexibility are reduced
Solution Approach 1:
The vacuum pump is designed with nested components where the nozzle, mixing section, diffusion section, and check valve are arranged concentrically within a single housing. This compact nested structure minimizes the volume occupied in the intake system while maintaining full vacuum generation capability.
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 effectively generates and manages vacuum for vacuum consumption devices, reducing costs and packaging constraints while efficiently adjusting to varying engine loads, thereby improving the overall efficiency and design of vehicle engine systems.
Implementation Method 1
air flows through an annular venturi passage located between identically shaped upper and lower halves
Data Source
AI summary
Methods and systems are provided for vacuum generating devices. In one example, a system includes a vacuum generating device having an annular venturi passage located between two identical halves.