Engine Control Logic for Diesel Particulate Filter Regeneration
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Solution Overview
Problem
Current thermal management strategies for diesel particulate filters (DPFs) in heavy-duty diesel engines are not optimal for low engine speed and load conditions, leading to unnecessary fuel consumption without sufficient exhaust temperature increase for efficient DPF regeneration, which can shorten the life of the DPF and affect fuel economy.
Innovation Solution
A method that determines engine operational status and discontinues thermal management if not required for DPF regeneration, re-initiating it only when predetermined conditions are met, ensuring efficient operation and reducing particulate and soot production, thereby optimizing the aftertreatment environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermal management mode is implemented to increase exhaust temperature for DPF regeneration, then DPF regeneration is facilitated, but fuel consumption increases unnecessarily during low engine speed and load conditions
Solution Approach 1:
The patent applies dynamics by making the thermal management mode conditional and adaptive rather than fixed. The control system dynamically adjusts whether thermal management is activated based on real-time evaluation of engine operating conditions (speed, load, vehicle speed, exhaust temperature) and DPF regeneration status. This allows the system to transition between thermal management mode and normal operation mode optimally, avoiding unnecessary fuel consumption during low engine speed and load conditions while still facilitating DPF regeneration when needed.
2Temperature
If thermal management operates during low engine speed and load conditions, then exhaust temperature is increased, but DPF regeneration efficiency is insufficient
Solution Approach 1:
The patent applies parameter changes by establishing specific threshold criteria for engine speed, engine load, vehicle speed, and exhaust temperature that must be met for thermal management to be considered effective. The control system continuously monitors these parameters and only maintains thermal management mode when the combination of parameters indicates both sufficient exhaust temperature and appropriate engine operating conditions for efficient DPF regeneration. This prevents ineffective thermal management operation during low engine speed and load conditions where regeneration efficiency would be insufficient.
3Reliability
If thermal management is continuously operated to ensure DPF regeneration, then DPF regeneration is maintained, but fuel economy deteriorates
Solution Approach 1:
The patent applies feedback by implementing a control system that continuously monitors engine operating conditions (speed, load, vehicle speed), exhaust temperature, and DPF regeneration status, then uses this feedback to determine whether thermal management mode should be maintained or discontinued. The system evaluates whether the current operating conditions satisfy predetermined criteria for effective DPF regeneration and adjusts thermal management operation accordingly. This feedback mechanism ensures DPF regeneration is maintained when needed while avoiding unnecessary thermal management operation that would deteriorate fuel economy.
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 reduces fuel consumption and extends the life of the DPF by ensuring optimal operating conditions for DPF regeneration, preventing unnecessary high temperatures and maintaining efficient engine operation during low load and speed conditions.
Implementation Method 1
an aftertreatment exhaust system with a diesel oxidation catalyst (DOC) and a diesel particulate filter (DPF)
Implementation Method 2
diesel oxidation catalyst (DOC) and a diesel particulate filter (DPF)
Data Source
AI summary
A method to operate an electronically controlled internal combustion engine that recognizes when thermal management mode of operation is being applied to an engine but is not attaining desired exhaust temperature for aftertreatment. When the Engine Control System (ECS) recognizes that the engine in operating in thermal management mode in a futile effort, the ECS aborts thermal management mode and returns to normal operating mode.