Hybrid EV Catalyst Heating Control for Demand Torque Spikes
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Solution Overview
Problem
Hybrid electric vehicles face challenges in determining the optimal time for catalyst heating control, leading to inefficient engine usage, increased fuel consumption, and repetitive engine starting due to unpredictable driver demand torque and catalyst temperature management.
Innovation Solution
A catalyst heating control method that switches from a drive motor-only mode to an engine-driven mode for catalyst heating, maintaining the engine mode until demand torque exceeds the motor's maximum output plus a predetermined margin, thereby optimizing catalyst temperature and preventing unnecessary engine starts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If catalyst heating control is started early to ensure catalyst temperature reaches activation temperature, then exhaust gas purification performance is improved, but fuel consumption increases due to extended engine operation
Solution Approach 1:
The system performs preliminary prediction of the engine startup time based on driver behavior patterns and vehicle operating conditions. Catalyst heating control is started at this predicted time rather than immediately or at fixed intervals, allowing the catalyst to be heated only when actually needed for exhaust purification, thereby avoiding unnecessary fuel consumption while ensuring emission standards are met.
2Use of energy by moving object
If catalyst heating control is delayed to reduce fuel consumption, then fuel efficiency is improved, but exhaust gas emission standards may not be satisfied
Solution Approach 1:
The system continuously monitors catalyst temperature, engine operating conditions, and vehicle state to dynamically adjust the catalyst heating control timing. This feedback mechanism ensures that heating is maintained long enough to achieve activation temperature and sustain it through the period when exhaust gases are being processed, guaranteeing emission compliance while avoiding excessive heating duration that would waste fuel.
3Temperature
If engine operation is extended to maintain catalyst temperature, then catalyst activation is ensured, but engine wear and operational complexity increase
Solution Approach 1:
The system dynamically adjusts engine operation parameters including idle RPM, ignition timing, and fuel injection based on real-time catalyst temperature and vehicle operating conditions. This dynamic control allows the engine to operate at optimal settings for catalyst heating when needed, then transition to fuel-efficient modes when catalyst temperature is sufficient, reducing overall operational complexity and wear while maintaining catalyst activation.
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 ensures efficient catalyst heating, reduces fuel consumption, and minimizes repetitive engine starting by aligning engine usage with driver demand torque, thus enhancing exhaust performance and fuel efficiency.
Implementation Method 1
the catalyst is heated through operation of the internal combustion engine
Data Source
AI summary
A hybrid electric vehicle and a catalyst heating control method are configured to select a point in time at which catalyst heating control is performed and to perform a follow-up measure based on the selected point in time. The catalyst heating control method includes performing mode switching from a first mode in which only a drive motor is used as a driving source to a second mode in which an engine is driven in a state in which a drive shaft and the engine are disconnected from each other to start heating of a catalyst of the engine. When demand torque higher than a maximum output of the drive motor occurs before the catalyst heating is completed, the second mode is maintained until the demand torque is greater than the sum of the maximum output and a predetermined margin.