Fuel Delivery Pressure Regulation for Clogged Filter Conditions
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Solution Overview
Problem
In transport climate control systems, the inlet pressure of prime movers can drop due to dirty fuel filters and adverse weather conditions, leading to potential shutdowns, especially when there is no mechanism to compensate for increased system resistance or air and water bleeds.
Innovation Solution
A fuel delivery system with a pressure regulator and positive displacement pump is used to manage inlet pressure, featuring a bleeder to reduce air ingestion and maintain pressure within manufacturer-specified limits, even under varying filter loading and temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fuel filter operates without a pressure compensation mechanism, then the system structure remains simple, but the inlet pressure drops below predetermined levels when the filter becomes dirty and clogged
Solution Approach 1:
A pressure regulator is introduced as an intermediary component between the fuel filter and the prime mover. The pressure regulator accepts input fuel flow from the filter and uses return fuel flow pressure as a reference to actively control and maintain outlet pressure within prescribed limits, thereby compensating for pressure drops caused by filter clogging without requiring complete system redesign
Solution Approach 2:
The pressure regulator implements a feedback mechanism by using the return fuel flow pressure as a reference pressure to control the outlet pressure. This closed-loop control ensures that the inlet pressure to the prime mover is maintained within manufacturer-specified limits despite variations in filter loading conditions
2Object-generated harmful factors
If air and water bleeds flow in reverse through the bleeder, then the system can vent air and water, but the inlet temperature increases and air ingestion occurs
Solution Approach 1:
The system design ensures that under normal operating conditions, air and water are prevented from reaching the bleeder in the first place through proper fuel system configuration and pressure management. The pressure regulator maintains positive pressure to prevent reverse flow, and the bleeder is positioned to allow air and water to escape before they can cause temperature increases or air ingestion
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 ensures consistent fuel flow and pressure control, preventing prime mover shutdowns and maintaining performance across a range of conditions, including cold weather and filter clogging.
Implementation Method 1
a pump disposed downstream of the fuel tank... The pump is configured to provide a first fuel flow through the first filter
Implementation Method 2
The pressure regulator is configured to accept a second portion of the first fuel flow as an input fuel flow and to accept a pressure of the return fuel flow as a reference pressure
Data Source
AI summary
A fuel delivery system for controlling an inlet pressure of a prime mover in a transport climate control system is provided. The fuel delivery system includes a fuel tank, a pressure regulator, a pump disposed downstream of the fuel tank, a first filter disposed downstream of the pump, and the prime mover disposed downstream of the first filter. The prime mover is located above the fuel tank in a vertical direction. The pump is configured to provide a first fuel flow through the first filter. The prime mover is configured to accept a first portion of the first fuel flow and is configured to provide a return fuel flow. The pressure regulator is disposed downstream of the first filter. The pressure regulator is configured to accept a second portion of the first fuel flow, and to accept a pressure of the return fuel flow as a reference pressure.