Exhaust Catalyst Temperature Control via Fuel Injection
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Solution Overview
Problem
Increasing the catalyst temperature in exhaust purification systems to improve particulate matter removal leads to fluctuations in driving torque and acceleration, resulting in decreased drivability.
Innovation Solution
The exhaust purification system employs an execution control unit to determine when to increase the catalyst temperature by comparing the fuel injection amount with thresholds based on engine rotational speed and driving torque fluctuations, ensuring minimal impact on drivability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fuel injection amount is increased to raise the catalyst temperature, then the particulate matter removal ability is improved, but the driving torque fluctuates and drivability deteriorates
Solution Approach 1:
The control system dynamically adjusts the fuel injection amount based on real-time driving conditions and catalyst temperature requirements. The execution control unit modifies the fuel injection strategy to raise catalyst temperature only when it does not conflict with drivability requirements, making the system adaptive rather than static.
Solution Approach 2:
The system changes the fuel injection amount parameter to control catalyst temperature. By carefully managing this parameter change within specific thresholds and conditions, the system achieves the desired temperature increase while minimizing the impact on driving torque and overall drivability.
2Productivity
If the catalyst temperature is increased to activate the catalyst, then the exhaust purification efficiency is improved, but abnormal noise is generated and drivability decreases
Solution Approach 1:
The system performs preliminary assessment of driving conditions before initiating catalyst temperature increase. The execution control unit evaluates whether the current driving state can tolerate the upcoming temperature rise actions, preventing drivability degradation by avoiding temperature increases during critical driving phases.
Solution Approach 2:
The control system continuously monitors driving torque, accelerator opening degree, and catalyst temperature to provide feedback to the execution control unit. This feedback mechanism allows real-time adjustment of the fuel injection strategy to maintain both exhaust purification efficiency and drivability.
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 the decrease in drivability when transitioning to a temperature rise mode, maintaining vehicle performance and driver experience.
Implementation Method 1
a catalyst to remove particulate matter contained in exhaust from a diesel engine... By increasing the temperature of the catalyst, an ability to remove the particulate matter contained in the exhaust is improved
Data Source
Figure 1
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AI summary
This exhaust purification system 1 is provided with: a fuel injection amount acquisition unit 11 for acquiring fuel injection amounts of a vehicle; a temperature acquisition unit 12 for acquiring the temperature of a catalyst for reducing and purifying nitrogen compounds in exhaust; a temperature control unit 13 for controlling the temperature of the catalyst; and an execution control unit 14 which causes the temperature control unit 13 to increase the temperature of the catalyst when the temperature of the catalyst is lower than a prescribed threshold and the fuel injection amount satisfies a prescribed condition.