G&M Tech Inc

Fuel Dosing Unit for DPF

PRODUCT > Fuel Dosing Unit for DPF

◆ DPF ( Diesel Particulate Filter )

Diesel engines produce a variety of particles during combustion. Wall-flow diesel particulate filters, also known as DPF (Diesel Particulate Filter), usually remove 85% or up to 100% of these particles(soot). And filters are designed to burn off the accumulated particulate either passively through the use of a catalyst or by active means such as a fuel burner which heats the filter to soot combustion temperatures. This burn off process is known as filter regeneration.

Regeneration is the process of removing the accumulated soot from the filter. This is done either passively or actively introducing very high heat into the exhaust system. On-board active filter management can use a variety of strategies:

Engine management to increase exhaust temperature through late fuel injection or injection during the exhaust stroke
Use of a fuel borne catalyst to reduce soot burn-out temperature
A catalytic oxidizer to increase the exhaust temperature, with after injection (HC-Doser)
Resistive heating coils to increase the exhaust temperature
Microwave energy to increase the particulate temperature
A fuel burner after the turbo charger to increase the exhaust temperature

Fuel burner strategy is mainly used. especially in retrofit market. And Most of on-board active systems also use extra fuel, whether through burning to heat the DPF. The additional fuel can be supplied by a dosing unit which has a metering pump and/or air compressor.

On-board fuel burner regeneration system (typical)

The controller monitors one or more sensors that measure back pressure and/or temperature, and based on pre-programmed set points the controller makes decisions on when to activate the regeneration cycle.

During regeneration cycle, the dosing unit inject the fuel into burner to heat DOC and DPF upon controller’s signal. The amount of injected fuel must match the amount of heat demand corresponding to temperature of DOC and/or DPF at given driving conditions.

◆ Fuel Dosing Unit

The main functions of the fuel dosing module include:

- Dosing of the precise amount of fuel necessary to heat DPF, and

- Supplying the air to spray and burn air/fuel mixture in the burner

Dosing unit consists of a solenoid fuel pump, oil-less air compressor and air pressure sensor. It can supply a mixture of fuel/air to burner and delivers the air pressure to the controller.

◆ Specification

Model	12V	24V
Operating voltage	10 ~ 15 V	19 ~ 29 V
Air flow rate @ 1ba	over 6.5 L/min	over 7 L/min
Fuel injection rate	20~250 g/min
Air Pressure sensor	0~0.785MPa (0.5~4.5Vdc
Electric Connector	KET MG654349
Weight	4 kg
Dimension	273 x 197 x 94
Fuel inlet/Return	Standard Ø7.89 (SAE J2044)
Fuel Outlet	Rc1/8 thread

1	Case	Material: ADC12
2	Cover	Material: SCP1
3	Oil-less Air Compressor	BLDC MOtor
4	Fuel Pump	Solenoid Piston Pump
5	Air Pressure Sensor
6	Electric Connector
7	Fuel In/Return Quick Connection Adapter
8	Fuel Outlet Fitting

◆ Dimension