Diesel Particle Filter Regeneration Control Strategy

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Solution Overview

Problem

Diesel particle filters in vehicles often fail to regenerate effectively in certain operating conditions, such as off-road or town driving, leading to blockages due to insufficient exhaust gas temperature for active regeneration and undesirable high NOx emissions for passive regeneration.

Innovation Solution

A method to determine the appropriate regeneration strategy for a diesel particle filter based on vehicle operating conditions, including soot mass, vehicle speed, engine speed, and exhaust characteristics, to initiate either active or forced passive regeneration, or to cease regeneration when conditions are unfavorable.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If active regeneration is used to raise exhaust gas temperature to 600°C, then regeneration effectiveness is improved, but fuel consumption increases and engine lubricant contamination worsens

Engineering Contradiction:

Improveregeneration effectivenessVSAvoidfuel consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The system changes the regeneration approach based on operating parameters. When exhaust temperature is sufficient, passive regeneration is allowed; when temperature is insufficient, active regeneration is triggered. This dynamic parameter-based selection optimizes fuel consumption while ensuring regeneration effectiveness.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The control system continuously monitors exhaust gas temperature, vehicle speed, and DPF soot loading to determine the appropriate regeneration strategy. This feedback mechanism allows the system to adapt to changing operating conditions and select the most efficient regeneration mode.

Inventive Principle:

Principle #23Feedback

2Use of energy by moving object

If passive regeneration is used to operate at lower exhaust gas temperature, then fuel consumption is reduced, but NOx emissions increase and regeneration may not complete in certain driving conditions

Engineering Contradiction:

Improvefuel consumptionVSAvoidNOx emissions

Core Design Contradiction:

Use of energy by moving objectVSObject-generated harmful factors

Solution Approach 1:

The system monitors exhaust temperature and vehicle operating conditions to dynamically select between passive and active regeneration. When exhaust temperature and vehicle speed indicate suitable conditions, passive regeneration is permitted; otherwise, active regeneration is triggered to ensure complete soot oxidation without excessive NOx emissions.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If active regeneration is initiated in off-road or town driving conditions, then regeneration can be achieved, but fuel consumption increases significantly due to insufficient exhaust gas temperature

Engineering Contradiction:

Improveregeneration completionVSAvoidfuel consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The control system evaluates vehicle speed, exhaust temperature, and DPF soot loading to determine whether active regeneration is appropriate. In off-road or town driving conditions with low exhaust temperature, the system permits passive regeneration when possible or delays regeneration until more favorable conditions occur, thereby minimizing fuel consumption while ensuring regeneration completion.

Inventive Principle:

Principle #35Parameter changes

4Productivity

If the DPF allows high soot mass accumulation before regeneration, then regeneration frequency is reduced, but the risk of blockage increases

Engineering Contradiction:

Improveregeneration frequencyVSAvoidDPF blockage risk

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system continuously monitors DPF soot loading and compares it against dynamically determined thresholds based on vehicle operating conditions. This feedback mechanism allows the system to initiate regeneration at optimal times, balancing the need to reduce regeneration frequency with the risk of DPF blockage.

Inventive Principle:

Principle #23Feedback

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 allows for efficient regeneration with minimal fuel consumption and reduced NOx emissions by adapting the regeneration strategy to the vehicle's operating conditions, ensuring the diesel particle filter remains effective without forcing the engine to produce high NOx emissions.

Implementation Method 1

Such filters trap small carbonaceous particles of an exhaust gas stream, to prevent emission to atmosphere

Methodology Applied

Scientific EffectPhysical filtration: Filter (physical)

Implementation Method 2

The unburned fuel is combusted in the usual catalytic converter, and thereby raises the temperature of the exhaust gas so that regeneration of the DPF can occur spontaneously

Methodology Applied

Scientific EffectCombustion: Combustion

Implementation Method 3

The unburned fuel is combusted in the usual catalytic converter

Methodology Applied

Scientific EffectCatalysis: Catalysis

Implementation Method 4

Regeneration is accomplished by oxidizing the soot mass

Methodology Applied

Scientific EffectOxidation: Oxidation

Data Source

PatentUS9976459B2Regeneration of diesel particle filter

Publication Date: 2018.05.22 JAGUAR LAND ROVER LTD

AI summary

Regeneration of a diesel particle filter of an internal combustion engine of a vehicle is controlled according to soot mass loading and the vehicle operating condition. Regeneration modes include active regeneration and forced passive regeneration, and operating conditions include highway, town and off-road driving. One strategy may determine initiation of regeneration, and another may determine cessation. Regeneration mode may change in real time.