Hybrid Control Unit AER-Based Catalyst Heating
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Solution Overview
Problem
Hybrid electric vehicles face challenges in reducing exhaust gas emissions, particularly when transitioning from charge depleting (CD) to charge sustaining (CS) mode, as catalyst heating and warm-up controls lead to excessive exhaust gas discharge during high power requirements, compromising fuel efficiency and marketability.
Innovation Solution
Implementing a system with a hybrid control unit that calculates and manages the all electric range (AER) to perform catalyst heating and warm-up controls in the CD mode, starting the engine only when the AER exceeds a reference level, and controlling engine power to maintain low load driving, thereby optimizing exhaust performance without deteriorating marketability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If catalyst heating and warm-up control is performed in charge sustaining (CS) mode when required power is large, then engine power is used to satisfy driving power, but exhaust gas is excessively discharged deteriorating exhaust performance
Solution Approach 1:
The patent performs catalyst heating and warm-up control in advance during charge depleting (CD) mode before transitioning to charge sustaining (CS) mode. By pre-heating the catalyst and engine during CD mode when the engine is already running, the system ensures that when CS mode is entered, the catalyst is already at optimal temperature, eliminating the need for additional catalyst heating in CS mode and thereby reducing exhaust gas emissions during high power demand periods.
2Object-generated harmful factors
If engine is started in charge depleting (CD) mode to perform catalyst heating and warm-up control in advance, then exhaust performance is improved, but all electric range (AER) is decreased deteriorating fuel efficiency certification value and marketability
Solution Approach 1:
The patent dynamically adjusts the control strategy based on real-time monitoring of all electric range (AER). The hybrid control unit continuously calculates AER and compares it with a predetermined reference value, making dynamic decisions about when to initiate catalyst heating and warm-up control. This dynamic approach allows the system to optimize exhaust performance while preserving AER by only activating engine-based heating when sufficient electric range is available.
Solution Approach 2:
The system implements a feedback mechanism where the hybrid control unit continuously monitors AER and uses this information to control the timing and duration of catalyst heating and warm-up operations. The feedback loop ensures that engine start decisions are made based on real-time AER status, preventing excessive engine usage that would compromise all electric range while still achieving adequate catalyst heating for exhaust performance.
3Loss of energy
If hybrid electric vehicle transitions from charge depleting (CD) to charge sustaining (CS) mode, then system efficiency is maintained, but catalyst heating and warm-up control causes excessive exhaust gas discharge
Solution Approach 1:
The patent performs catalyst heating and warm-up control in advance during charge depleting (CD) mode before transitioning to charge sustaining (CS) mode. By pre-heating the catalyst and engine during CD mode when the engine is already running, the system ensures that when CS mode is entered, the catalyst is already at optimal temperature, eliminating the need for additional catalyst heating in CS mode and thereby reducing exhaust gas emissions during high power demand periods.
Data Source
AI summary
A system and a method for reducing exhaust gas of a hybrid electric vehicle are disclosed. A system for reducing exhaust gas of a hybrid electric vehicle according to an exemplary form of the present disclosure may include: a battery management system measuring a state of charge (SOC) of a high voltage battery of the hybrid electric vehicle; a motor control unit controlling a driving motor with power of the high voltage battery to generate motor driving force; an engine control unit controlling an engine to generate engine driving force; and a hybrid control unit checking an all electric range (AER) according to a driving in a charge depleting (CD) mode of the hybrid electric vehicle to perform a catalyst heating and warm up control by starting the engine in the CD mode in the case in which the checked AER exceeds a reference AER.