Engine Control Adjusting Speed Rate for Catalyst Temperature
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Solution Overview
Problem
Existing engine control systems fail to effectively manage catalyst temperature, leading to inefficient exhaust gas purification due to high temperatures, which can degrade catalyst efficiency and increase exhaust emissions.
Innovation Solution
An engine control system that adjusts the rate of increase in engine output speed based on catalyst temperature, reducing the delivery of exhaust gas when the catalyst is at high temperatures to prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the engine speed is corrected to operate within the discharge amount limit range to generate electricity, then the exhaust emissions are reduced, but the catalyst temperature becomes too high to allow effective purification
Solution Approach 1:
The patent applies dynamics by making the engine speed correction rate variable rather than fixed. The control section adjusts the correction rate dynamically based on the catalyst temperature, increasing the correction rate when temperature is low to quickly reduce emissions, and decreasing the correction rate when temperature is high to prevent overheating. This dynamic adjustment resolves the contradiction between reducing emissions and maintaining catalyst temperature within effective ranges.
Solution Approach 2:
The patent changes the parameter of engine speed correction rate based on catalyst temperature conditions. By monitoring catalyst temperature and adjusting the correction rate parameter accordingly, the system optimizes the balance between emission reduction and catalyst temperature control. This parameter change approach allows the system to adapt to varying thermal conditions and maintain optimal purification efficiency.
2Use of energy by moving object
If the engine operation range is determined based on discharge amount limit to generate electricity, then fuel economy is improved, but the catalyst purification efficiency deteriorates due to high temperature
Solution Approach 1:
The patent implements feedback control by continuously monitoring catalyst temperature and using this information to adjust the engine speed correction rate. The control section receives temperature feedback from the catalyst and modifies the emission control strategy in real-time. This feedback mechanism ensures that fuel economy improvements do not compromise catalyst purification efficiency, as the system automatically reduces correction aggressiveness when temperature indicates potential efficiency loss.
Data Source
AI summary
An engine control system for an engine equipped with a catalyst that purifies exhaust gas includes: a catalyst temperature acquisition section that acquires the temperature of the catalyst; and a control section that controls an engine such that a rate of increase in engine output speed is changed in accordance with the temperature of the catalyst.