Hybrid Vehicle Catalyst Control via Dynamic Fuel Injection
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Solution Overview
Problem
Hybrid vehicles experience deterioration of exhaust emission control device catalyst performance due to oxygen accumulation when the catalyst temperature is high and fuel supply is cut, leading to reduced conversion performance.
Innovation Solution
A hybrid vehicle control system that adjusts engine and motor operation based on catalyst temperature, using fuel injection when the temperature is above a predetermined level to prevent oxygen accumulation and operates without fuel injection when the temperature is below this level to avoid oxygen supply, thereby maintaining catalyst performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If fuel supply is cut when catalyst temperature is high to charge the battery, then charging power is improved, but oxygen accumulates in the catalyst and conversion performance deteriorates
Solution Approach 1:
The control device changes the operating parameter (fuel supply state) based on the catalyst temperature parameter. When catalyst temperature is high, fuel supply is maintained to prevent oxygen accumulation and preserve catalyst performance. When catalyst temperature is low, fuel supply is cut to enable battery charging. This dynamic parameter adjustment resolves the contradiction between charging power and catalyst performance.
2Power
If fuel supply is cut during engine rotation to charge the battery, then battery charging is improved, but oxygen accumulates in the exhaust emission control device
Solution Approach 1:
The system dynamically changes the fuel supply parameter based on catalyst temperature conditions. At high temperatures where oxygen accumulation is problematic, fuel supply is maintained. At low temperatures where the catalyst is less active and less prone to oxygen accumulation, fuel supply is cut to maximize charging. This resolves the contradiction between battery charging and oxygen accumulation.
3Use of energy by moving object
If the engine is rotated without fuel injection to save energy, then energy consumption is reduced, but catalyst temperature decreases and oxygen accumulation risk increases
Solution Approach 1:
The control device adjusts the fuel injection parameter based on catalyst temperature. When catalyst temperature is high, the engine operates without fuel injection to save energy. When catalyst temperature drops below the threshold, fuel injection is restored to maintain temperature and prevent oxygen accumulation. This dynamic adjustment resolves the contradiction between energy saving and catalyst temperature maintenance.
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 oxygen accumulation and deterioration of the catalyst's conversion performance by optimizing engine and motor control according to catalyst temperature, ensuring efficient operation and longevity of the exhaust emission control device.
Implementation Method 1
an exhaust emission control device equipped with a catalyst when a catalyst temperature in the exhaust emission control device is equal to or higher than a predetermined temperature
Data Source
AI summary
A hybrid vehicle comprises an engine configured to output power for driving and equipped with an exhaust emission control device in an exhaust system thereof. The hybrid vehicle further comprises a control device. In response to a predetermined rotation request for rotating the engine with no need to output power from the engine, the control device performs a control to rotate the engine with fuel injection when a catalyst temperature in the exhaust emission control device is equal to or higher than a predetermined temperature, while performing a control to rotate the engine without the fuel injection when the catalyst temperature is lower than the predetermined temperature.