Hybrid Power Control for Catalyst Temperature and Ammonia Slip
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Solution Overview
Problem
Conventional hybrid electric vehicles face issues with ammonia slip due to rapid catalyst temperature rises during sudden engine output changes, leading to decreased ammonia adsorption and subsequent emissions.
Innovation Solution
A hybrid vehicle system adjusts fuel injection quantity and motor torque based on catalyst temperature and battery state of charge (SOC) to prevent rapid catalyst temperature increases, using correction coefficients to calculate reduced fuel injection and increased motor torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If engine output is increased rapidly to meet power demand, then vehicle acceleration performance is improved, but catalyst temperature rises rapidly causing ammonia desorption and emissions
Solution Approach 1:
The control system performs preliminary action by predicting future catalyst temperature based on current temperature and engine output changes. This allows the system to preemptively adjust fuel injection and motor torque to prevent rapid temperature rises that would cause ammonia desorption, rather than reacting after emissions occur.
Solution Approach 2:
The invention applies dynamics by making the fuel injection quantity and motor torque dynamically adjustable based on real-time catalyst temperature and predicted temperature changes. The control amounts are continuously modified to maintain optimal catalyst temperature for ammonia adsorption while meeting power demands.
2Object-generated harmful factors
If fuel injection quantity is reduced to prevent catalyst temperature rise, then ammonia emissions are suppressed, but vehicle power output decreases
Solution Approach 1:
The invention merges the functions of the engine and motor into a coordinated powertrain system. When fuel injection is reduced to suppress ammonia emissions, the motor provides compensating torque to maintain overall vehicle power output. This combination allows emission control without sacrificing performance.
Solution Approach 2:
The system changes parameters by adjusting both fuel injection quantity and motor torque simultaneously based on catalyst temperature conditions. Rather than changing only one parameter, the coordinated adjustment of multiple parameters enables emission reduction while maintaining power output through motor compensation.
3Power
If motor torque is increased to compensate for reduced engine output, then vehicle power is maintained, but battery discharge rate increases
Solution Approach 1:
The control system employs feedback by continuously monitoring catalyst temperature, engine output, and motor torque, then adjusting fuel injection and motor power accordingly. This closed-loop control ensures that motor compensation is applied only when and where needed to maintain power while controlling emissions, optimizing battery energy usage.
Solution Approach 2:
The system dynamically balances engine and motor power contribution based on real-time conditions. Motor torque is increased only to the extent necessary to compensate for engine output reduction, and this compensation is continuously adjusted as catalyst temperature and power demands change, optimizing energy efficiency.
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 effectively suppresses ammonia slip by stabilizing catalyst temperature and maintaining battery SOC, ensuring efficient power distribution without ammonia emissions.
Implementation Method 1
The catalyst reduces NOx emissions by adsorbing ammonia, which is contained in urea water injected into the exhaust gas
Implementation Method 2
reacting NOx contained in the exhaust gas with the ammonia to reduce NOx to nitrogen and water
Implementation Method 3
a charging rate of a battery that supplies electricity to the motor
Data Source
AI summary
A hybrid vehicle includes: a first determination part that determines a fuel injection quantity of an engine and a motor torque generated by a motor on the basis of an opening degree of the accelerator; a second determination part that determines a correction coefficient for correcting the fuel injection quantity and the motor torque on the basis of (i) the temperature of a catalyst that purifies NOx contained in exhaust gas of the engine, by reacting the NOx with ammonia, which is contained in urea water injected into the exhaust gas, and (ii) an SOC of the battery 6 that supplies electricity to the motor; and a calculation part that calculates a corrected fuel injection quantity that is smaller than the fuel injection quantity and a corrected motor torque that is larger than the motor torque on the basis of the correction coefficient.