Diesel DPF Regeneration Control for Inappropriate Conditions
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Solution Overview
Problem
Existing diesel engine exhaust treatment devices lack the ability to prohibit driving-time forced regenerating of the DPF when it is inappropriate, such as during low exhaust temperature or hazardous ingredient concentration levels.
Innovation Solution
The exhaust treatment device includes a DPF, PM accumulation estimation means, DPF regenerating means, DPF regenerating control means, memory, acceleration regenerating request information notification means, and mode switch manipulation means, allowing for switching between normal and acceleration coexistence regenerating modes or acceleration-sole regenerating modes to control and prohibit DPF regenerating processing based on specific determination values and driver input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving-time forced regenerating is automatically started and continued, then PM accumulation in DPF is reduced, but the system cannot prohibit regenerating when exhaust temperature or hazardous ingredient concentration is low
Solution Approach 1:
The patent introduces a dynamic control system that allows the DPF regenerating process to be started, continued, or prohibited based on real-time conditions and driver input. The control unit monitors exhaust temperature, hazardous ingredient concentration, and driver operations (accelerator depression, brake application) to dynamically adjust whether regenerating proceeds, enabling the system to adapt to varying operational conditions rather than automatically continuing regardless of context
Solution Approach 2:
The system incorporates feedback mechanisms where the control unit continuously monitors exhaust parameters (temperature, hazardous ingredient concentration) and driver operations, then uses this feedback to determine whether to permit or prohibit regenerating. The notification unit provides feedback to the driver about regenerating status and requirements, creating a closed-loop control system that responds to changing conditions
2Productivity
If DPF regenerating processing is executed automatically, then PM is combusted and eliminated, but exhaust temperature and hazardous ingredient concentration cannot be maintained at low levels
Solution Approach 1:
The system applies preliminary anti-action by checking whether regenerating should be prohibited before actually executing the regenerating process. The control unit evaluates exhaust temperature, hazardous ingredient concentration, and driver operations in advance, and can prevent regenerating from starting or continuing based on these pre-assessments, thereby avoiding situations where regenerating would cause harmful effects
Solution Approach 2:
The patent utilizes parameter changes by monitoring exhaust temperature and hazardous ingredient concentration as key parameters to determine regenerating eligibility. When these parameters indicate inappropriate conditions (low temperature, high hazardous ingredients), the system changes the regenerating state from active to prohibited, effectively using parameter thresholds to control the process
3Reliability
If DPF regenerating processing is executed automatically, then PM accumulation is reduced, but fuel efficiency degrades and engine output is reduced
Solution Approach 1:
The system dynamically determines whether to execute regenerating based on real-time assessment of exhaust conditions and driver intent, rather than following a fixed automatic schedule. By evaluating multiple parameters including exhaust temperature, hazardous ingredient concentration, and driver operations, the system can dynamically prohibit regenerating when conditions suggest it would be inefficient or inappropriate, thereby preserving fuel efficiency and engine output
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
Enables the prohibition of DPF regenerating processing in inappropriate situations, maintaining low exhaust temperature and hazardous ingredient levels, while preventing prolonged regenerating processing that could degrade fuel efficiency or reduce engine output, and alerts for potential DPF clogging or abnormal conditions.
Implementation Method 1
a DOC 10 which oxidizes and combusts non-combustion fuel through oxygen within exhaust 11
Implementation Method 2
oxidizes and combusts non-combustion fuel through oxygen within exhaust 11, thereby raising a temperature of exhaust 11
Implementation Method 3
a DPF 1; PM accumulation estimation means 2 for PM accumulated in the DPF 1
Data Source
AI summary
An object of the present invention is to provide the exhaust treatment device of a diesel engine which is capable of prohibiting the execution of DPF regenerating processing in a situation in which the DPF regenerating processing is inappropriate. In order to achieve the object, DPF regenerating mode switch manipulation means (7a) switches a DPF regenerating mode to a normal and acceleration coexistence regenerating mode (51) or an acceleration-sole regenerating mode (52), and DPF regenerating selection manipulation means (7b) switches a position to a normal regenerating permission position (53), a normal regenerating cancel position (54), or an acceleration regenerating execution position (55). When the DPF regenerating mode is in the acceleration-sole regenerating mode (52), the DPF regenerating control means prohibits normal regenerating processing by the DPF regenerating means irrespective of a position selected by the DPF regenerating selection manipulation means (7b).