Diesel DPF Regeneration Control for Fuel Economy
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Solution Overview
Problem
Conventional exhaust-gas processing devices for diesel engines fail to timely warn the necessity of stopping-forced-regeneration, leading to prolonged running-forced-regeneration, which deteriorates fuel-consumption and reduces output.
Innovation Solution
An exhaust-gas processing device with a DPF, a PM deposited-amount presuming means, DPF-regeneration control means, storing means, and message sending means for accelerated regeneration, allowing for automatic switching from normal to accelerated regeneration based on predefined judging values and time thresholds, thereby preventing prolonged regeneration processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If running-forced-regeneration is automatically initiated when PM deposited amount reaches the first set value, then the DPF can be cleaned during vehicle operation, but the regeneration process may continue for a long time causing fuel-consumption deterioration and output reduction
Solution Approach 1:
The system performs preliminary action by storing a reservation term (T1) in advance when PM deposited amount reaches the first set value. During this reservation period, the system monitors whether PM amount decreases below the first set value. If it does, accelerated regeneration is triggered before normal regeneration would start, preventing prolonged regeneration and reducing fuel consumption while ensuring DPF cleaning effectiveness.
2Device complexity
If the system waits for PM deposited amount to reach the second set value before warning stopping-forced-regeneration, then the warning system is simple, but the warning is delayed causing normal regeneration to continue unnecessarily
Solution Approach 1:
The system performs preliminary monitoring action by storing the reservation term (T1) when PM reaches the first set value. Instead of waiting for the second set value, the system proactively checks during the reservation period whether PM decreases. This preliminary detection enables timely warning and switching to accelerated regeneration, reducing unnecessary regeneration time while maintaining simple system architecture through existing set value thresholds.
3Reliability
If normal regeneration processing continues for an extended period, then complete PM removal is ensured, but fuel-consumption deterioration and output reduction occur
Solution Approach 1:
The system dynamically adjusts the regeneration mode based on real-time PM deposited amount monitoring. During the reservation term (T1), if PM decreases below the first set value, the system switches from the planned normal regeneration to accelerated regeneration. This dynamic adjustment ensures complete PM removal while minimizing regeneration duration, thereby preventing engine output reduction and fuel-consumption deterioration.
Solution Approach 2:
The system changes the regeneration parameter by switching from normal regeneration to accelerated regeneration based on PM deposited amount trends. When PM decreases during the reservation period, the system activates accelerated regeneration mode, which uses different operational parameters (higher injection quantity, higher exhaust temperature) to complete PM removal faster, thus maintaining engine productivity while ensuring reliability.
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 solution inhibits fuel-consumption deterioration and output reduction by promptly switching to accelerated regeneration when necessary, preventing extended normal regeneration processing and ensuring the DPF remains unclogged, thus maintaining engine operation stability.
Implementation Method 1
the DPF captures the PM in the exhaust gas
Implementation Method 2
a running-forced-regeneration for activating the forced-regeneration means is automatically initiated to burn the PM for removing it
Implementation Method 3
the DPF-regeneration control means 4 automatically enables the DPF-regeneration means 3 to start the normal regeneration processing (S2) so as to increase the temperature of the exhaust gas to be passed through the DPF 1
Data Source
AI summary
The present invention has an object to provide an exhaust-gas processing device for a diesel engine, able to inhibit the deterioration of the fuel-consumption and the output reduction.In order to accomplish the above object, the device is provided with a DPF, a means for presuming the amount of PM to be deposited on the DPF, a DPF-regeneration means, a DPF-regeneration control means, a storing means, a means for sending message to demand an accelerated regeneration, and an operation means for starting the accelerated regeneration. While a normal regeneration processing is being continued (S6) since it has started (S2), the time when a term (T1) for reserving judgment as to the demand for accelerated regeneration has elapsed is taken as the judging time (T3). At this judging time (T3), if the assumed value of the PM deposed amount exceeds a value (J2) for judgment as to the demand for accelerated regeneration, the accelerated regeneration is deemed to be demanded. Then the DPF-regeneration control means allows the means for sending message to demand the accelerated regeneration to start (S8) sending the message to demand the accelerated regeneration.