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Real-World Comparison of Diesel Vehicle Emissions Before and After CDPF Installation

2025-07-13

Field test data clearly demonstrates that installing a CDPF (Catalyzed Diesel Particulate Filter) on diesel vehicles leads to significant improvements in emission performance. Major reductions are observed in particulate matter (PM), smoke opacity, and visible black smoke (Ringelmann scale).

Test Overview:

Vehicle: Euro IV light-duty diesel truck
Test Methods: Free acceleration + static opacity test
CDPF Specs: 400 CPSI, silicon carbide substrate, low-temp catalytic coating
Regeneration: Combined passive and active modes
Condition: Both cold-start and warm engine tests were conducted

Key Results Comparison:

Test Parameter	Before Installation	After Installation	Reduction Rate
Ringelmann Smoke Level	Level 3–4	Level 0–1	~75% decrease
PM Emissions	0.35 g/kWh	0.04 g/kWh	~88% decrease
Exhaust Opacity	42%	8%	~81% decrease
Odor Intensity (Subjective)	Strong/irritating	Barely noticeable	Significant improvement
OBD Fault Code Frequency	Occasional alerts	No alerts	Stable system

Analysis:

After CDPF installation, emissions remained low under both cold and hot engine conditions.
The low-temperature catalyst and passive regeneration ensured stable soot oxidation.
Black smoke and odor were virtually eliminated; emissions inspection passed smoothly.
No adverse effects such as excessive backpressure or reduced engine power were observed.

Conclusion: High-efficiency CDPFs provide excellent emission reduction results for diesel vehicles, making them ideal for use in environmentally regulated areas like city logistics and construction zones.

Wuxi Grace Environmental Technology CO,.LTD

products

Catalyst DPF

Three Way Catalytic Converter

SCR Denox Catalyst

Honeycomb Catalyst

DPF Diesel Particulate Filter

Metallic Catalyst Substrates

VOC Catalyst

claudia@graceet.com 86-138-6182-2490

No.333 Jincheng East Road, Xinwu District, Wuxi City, Jiangsu Province, China

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Real-World Comparison of Diesel Vehicle Emissions Before and After CDPF Installation

Field test data clearly demonstrates that installing a CDPF (Catalyzed Diesel Particulate Filter) on diesel vehicles leads to significant improvements in emission performance. Major reductions are observed in particulate matter (PM), smoke opacity, and visible black smoke (Ringelmann scale).

Test Overview:

Vehicle: Euro IV light-duty diesel truck

Test Methods: Free acceleration + static opacity test

CDPF Specs: 400 CPSI, silicon carbide substrate, low-temp catalytic coating

Regeneration: Combined passive and active modes

Condition: Both cold-start and warm engine tests were conducted

Key Results Comparison:

Test Parameter

Before Installation

After Installation

Reduction Rate

Ringelmann Smoke Level

Level 3–4

Level 0–1

~75% decrease

PM Emissions

0.35 g/kWh

0.04 g/kWh

~88% decrease

Exhaust Opacity

42%

8%

~81% decrease

Odor Intensity (Subjective)

Strong/irritating

Barely noticeable

Significant improvement

OBD Fault Code Frequency

Occasional alerts

No alerts

Stable system

Analysis:

After CDPF installation, emissions remained low under both cold and hot engine conditions.

The low-temperature catalyst and passive regeneration ensured stable soot oxidation.

Black smoke and odor were virtually eliminated; emissions inspection passed smoothly.

No adverse effects such as excessive backpressure or reduced engine power were observed.

Conclusion: High-efficiency CDPFs provide excellent emission reduction results for diesel vehicles, making them ideal for use in environmentally regulated areas like city logistics and construction zones.

Catalyst DPF

Three Way Catalytic Converter

SCR Denox Catalyst

Honeycomb Catalyst

DPF Diesel Particulate Filter

Metallic Catalyst Substrates

VOC Catalyst