Hybrid Engine Controller Fuel Vapor Purging
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Solution Overview
Problem
Existing hybrid vehicle propulsion systems face challenges in selecting combustion modes due to insufficient fuel vapor purging, which affects fuel efficiency and emissions, particularly when transitioning between spark ignition (SI) and homogeneous charge compression ignition (HCCI) modes.
Innovation Solution
A hybrid vehicle propulsion system that includes an engine capable of operating in multiple combustion modes, an energy storage device, a motor, and a fuel tank vapor purging system, with a controller that coordinates fuel vapor supply during different combustion modes to improve fuel economy and reduce emissions by enabling fuel vapor purging in SI mode before transitioning to HCCI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the engine operates in HCCI mode to improve fuel efficiency and reduce emissions, then fuel economy is improved, but fuel vapor purging becomes insufficient
Solution Approach 1:
The controller performs fuel vapor purging during SI mode operation before transitioning to HCCI mode. This preliminary action ensures that fuel vapors are adequately purged from the fuel tank while the engine is still in SI mode, so that when the engine transitions to HCCI mode for improved fuel economy, the fuel vapor purging requirement has already been satisfied.
2Adaptability or versatility
If the engine transitions between SI and HCCI modes based on driving conditions, then adaptability is improved, but insufficient fuel vapor purging occurs during HCCI operation
Solution Approach 1:
The controller is configured to perform fuel vapor purging operations during SI mode before the engine transitions to HCCI mode. This ensures that when the engine operates in HCCI mode for improved fuel economy and reduced emissions, the fuel vapor purging requirement has already been satisfied during the preceding SI mode operation.
3Reliability
If fuel vapor purging is limited during HCCI operation, then HCCI mode stability is improved, but fuel vapor emissions increase
Solution Approach 1:
The controller performs fuel vapor purging during SI mode operation before transitioning to HCCI mode. This preliminary purging action ensures that fuel vapors are adequately removed from the fuel tank while the engine is in SI mode, so that when the engine transitions to HCCI mode for improved stability and fuel economy, the fuel vapor purging requirement has already been satisfied, preventing fuel vapor emissions during HCCI operation.
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 approach enhances fuel economy and reduces emissions by ensuring sufficient fuel vapor purging during HCCI operation, allowing for more efficient engine mode selection and motor/storage operation, while maintaining desired propulsion system output.
Implementation Method 1
a motor configured to absorb at least a portion of an output produced by the engine and convert said absorbed engine output to energy storable by the energy storage device
Implementation Method 2
the motor is further configured to produce a motor output
Implementation Method 3
An internal combustion engine for a vehicle may operate in variety of combustion modes
Data Source
AI summary
A hybrid vehicle propulsion system, comprising of an engine having at least one combustion cylinder configured to selectively operate in one of a plurality of combustion modes, wherein a first combustion mode is a spark ignition mode and a second combustion mode is a homogeneous charge compression ignition mode, an energy storage device configured to store energy, a motor configured to absorb at least a portion of an output produced by the engine and convert said absorbed engine output to energy storable by the energy storage device and wherein the motor is further configured to produce a motor output, a fuel tank vapor purging system coupled to the engine, and a controller configured to vary fuel vapors supplied to the engine during different combustion modes of the engine.