Active Purge System for Hybrid Vehicle Evaporation Gas Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional purge systems for hybrid vehicles with superchargers fail to effectively move evaporation gas from a canister to the intake pipe due to higher internal pressure, leading to reduced fuel efficiency and increased CO2 emissions when the engine's operating line is optimized for system efficiency.
Innovation Solution
An active purge system with a control unit that adjusts the RPM of a purge pump and the opening amount of a purge valve to manage evaporation gas throughput based on engine torque, system efficiency, and battery state of charge, ensuring evaporation gas is effectively purged even when the operating line changes with increased part load max.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a supercharger is mounted to generate large output, then engine power is improved, but intake pipe pressure increases making it difficult to move evaporation gas from canister to intake pipe
Solution Approach 1:
A purge pump is introduced as an intermediary device to actively transport evaporation gas from the canister to the intake pipe, overcoming the pressure barrier created by the supercharger. The purge pump serves as a mediator that enables gas flow despite the high intake pressure that would otherwise prevent effective purging.
Solution Approach 2:
The passive mechanical purging system (relying on intake negative pressure) is replaced with an active mechanical system using an electrically-driven purge pump. This substitution allows the system to overcome pressure differentials that cannot be resolved by natural intake pressure alone, particularly when the supercharger creates high intake pressure.
2Loss of energy
If engine torque is increased to satisfy updated optimal operating line, then system efficiency is improved, but evaporation gas throughput must be controlled to prevent excessive purging
Solution Approach 1:
The purge pump RPM and purge valve opening amount are dynamically adjusted based on real-time operating conditions including engine torque, optimal operating line position, and evaporation gas generation rate. This dynamic control allows the system to optimize fuel efficiency while preventing excessive purging that would occur with fixed-rate purging systems.
Solution Approach 2:
The control unit continuously monitors engine operating parameters and adjusts the purge pump operation and purge valve opening accordingly. This feedback mechanism ensures that evaporation gas throughput matches actual generation rates and system efficiency requirements, preventing both insufficient purging and excessive purging that would waste fuel.
3Productivity
If purge pump RPM and purge valve opening are controlled for each step, then evaporation gas throughput is precisely managed, but control system complexity increases
Solution Approach 1:
The control system uses dynamic, multi-level adjustment of purge pump RPM and purge valve opening amount based on operating conditions. Rather than simple on/off control, the system employs stepped or continuous adjustment across multiple levels, allowing precise management of evaporation gas throughput while responding to changing engine loads and efficiency requirements.
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 active purge system effectively moves evaporation gas from the canister to the intake pipe, enhancing fuel efficiency and reducing CO2 emissions by optimizing the purge process in hybrid vehicles with turbocharged engines, even during expanded EV traveling modes.
Implementation Method 1
a purge line (100) connecting the intake pipe (I) to a canister (C) for adsorbing the evaporation gas, a purge pump (200) mounted on the purge line (100)... an active purge unit for pressing the evaporation gas generated by a fuel tank and supplying the pressed evaporation gas to an intake pipe
Data Source
AI summary
The present disclosure relates to an active purge system and an active purge method for a hybrid vehicle, and changes a control method for the throughput of the evaporation gas according to the engine torque according to a change in an optimal operating line, the system efficiency, or the state of charge (SOC) condition of a battery using an active purge unit for pressing the evaporation gas generated by a fuel tank and supplying the pressed evaporation gas to an intake pipe, thereby efficiently purging the evaporation gas.