Vehicle exhaust removal system for buildings and method of control
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Solution Overview
Problem
Existing facility exhaust ventilation systems face issues with energy inefficiency, unnecessary operation, and nuisance activations due to unreliable vehicle proximity transmitters and lack of phase loss protection, leading to unsafe and costly conditions.
Innovation Solution
An intelligent facility exhaust ventilation system with a vehicle-equipped transmitter providing operational status, an ID scanner for vehicle identification, pressure and air quality sensors, and a control system with variable speed motor drives and phase protection, integrated with induction loops for precise vehicle tracking and zone-based activation decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple proximity transmitter is used to control exhaust ventilation activation, then the system can be activated when a vehicle is near the facility, but nuisance activations occur when vehicles are within wireless range but outside the facility
Solution Approach 1:
The control system is divided into multiple independent components: a receiver that detects transmitter signals, induction loops embedded in the driveway that detect vehicle presence, and a control panel that processes both signals to make activation decisions. This segmentation allows each component to perform a specific function reliably without requiring the entire system to be overly complex.
Solution Approach 2:
Induction loops serve as an intermediary verification mechanism between the transmitter signal and the ventilation activation decision. The loops detect whether a vehicle is physically present on the driveway, providing additional confirmation that prevents nuisance activations from distant vehicles while maintaining system reliability.
2Reliability
If the exhaust ventilation system operates continuously to ensure safety, then exhaust removal is guaranteed, but energy consumption increases and conditioned air is lost
Solution Approach 1:
The ventilation system transitions from continuous operation to dynamic on-demand operation. The system activates only when both a transmitter signal is received and a vehicle is detected on the driveway by induction loops, and deactivates when neither condition is met. This dynamic operation maintains exhaust removal safety during vehicle operations while reducing energy consumption and conditioned air loss during idle periods.
Solution Approach 2:
The system uses feedback from both the transmitter and induction loops to control ventilation activation. This dual-feedback mechanism ensures the system operates only when actually needed (when a vehicle is present and running), preventing unnecessary energy consumption while maintaining safety during vehicle operations.
3Power
If a three-phase motor is used to drive the exhaust fan, then sufficient power is available for high-volume air removal, but phase loss can cause motor overheating and failure
Solution Approach 1:
The control panel performs preliminary monitoring of all three-phase power inputs before the motor starts operating. By continuously checking for phase loss conditions in advance, the system can prevent motor overheating and failure before they occur, ensuring both the power output and reliability of the motor system.
Solution Approach 2:
The control panel automatically monitors the three-phase power supply and provides protection without requiring external intervention. The system self-detects phase loss conditions and prevents motor operation under faulty conditions, making the motor more reliable while maintaining its high power capability for air removal.
Data Source
AI summary
A system and method for controlling facility exhaust systems and vehicle power interconnections. A controller for controlling exhaust ventilation systems in facilities related to vehicles, wherein the controller automatically engages and reengages operation of the exhaust ventilation system, based on vehicle status inputs and wherein the system is capable of determining location of a vehicle even when receiving an operational status signal, to avoid unnecessary operation when the vehicle is out of the facility and there is no need for ventilation of exhaust gases for the vehicle.