Field of the invention
[0001]This invention relates to the field of a fuel injector assembly.
Background of the invention
[0002]Controlling of exhaust from engines has become important in view stringent emission regulations worldwide. The methods employed to reduce emissions are selective catalytic reduction technology (SCR) and diesel particulate filter (DPF) to remove particulate matter. The subject of interest here is the DPF technology. To ensure that particulates are oxidized at a sufficient rate, the filter must operate at a sufficient temperature, one of the methods for increasing the temperature of exhaust is by fuel combustion in the exhaust system. An electric feed pump located proximal to the exhaust system sucks fuel from the fuel tank and injects the same during regeneration of DPF. Since the DPF regeneration happens only when there is requirement for controlling particulate emission, the use of electric feed pump for said purposes is not economical. Hence there is need fuel to made available during dosing requirement without the use of a separate electric feed pump.
Brief description of the accompanying drawing
[0003] Different modes of the invention are disclosed in detail in the description and
illustrated in the accompanying drawing:
[0004] FIG. 1 illustrates a device for enabling hydrocarbon injection; and
Detailed description of the embodiments
[0005] FIG. 1 illustrates a device 100 for enabling hydrocarbon injection. The device 100 is located upstream to a diesel particulate filter (DPF) 102. The DPF 102 is located along the exhaust path and comprises at least an inlet port in flow communication with a high pressure fuel injection pump, a pressurizing chamber comprising a reciprocating plunger 110. The pressuring chamber 108 adapted to

receive fuel from the inlet port 104, and, an outlet port 112 adapted to receive fuel from the pressurizing chamber 108 and deliver the fuel to a dosing module of the DPF 102.
[0006]The constructional features of the device 100 will be explained in further detail. The device 100 is located upstream to the diesel particulate filter (DPF 102), the DPF 102 is located along the exhaust path. The device 100 comprises an an inlet port 104 in flow communication with a high pressure fuel injection pump. The function of the inlet port 104 is to receive fuel from the high pressure fuel injection pump. The fuel that is received from the high pressure fuel injection pump is usually the excess fuel that cannot be delivered to the common rail and/ or the injector. This excess fuel is received by the device. The device 100 comprises a pressurizing chamber 108. The pressurizing chamber 108 comprises a reciprocating plunger 110. The plunger 110 may be driven by the engine crankshaft or by supplying the pressurized lube oil or air. The device 100 also comprises an outlet port 112 adapted to receive fuel from the pressurizing chamber 108 and deliver the fuel to a dosing module of the DPF 102.
[0007]During working, fuel from the fuel tank is delivered to the high pressure fuel injection pump for pressurization. A part of the fuel from the high pressure fuel injection pump is delivered to the common rail. A flow path from the fuel injection pump is in flow communication with the device. Fuel flows through the flow path and reaches the inlet port 104. The inlet port 104 is in flow communication with a high pressure fuel injection pump. The pressurizing chamber 108 is adapted to receive fuel from the inlet port 104 and comprises a reciprocating plunger 110. The reciprocating plunger 110 may receive motion from the engine crankshaft. The fuel that is received in the pressurizing chamber 108 is pressurized by the plunger 110 and the fuel flows via the outlet port 112 and is delivered to the dosing module of the DPF 102. With the use of the above mentioned device, it is possible to use the fuel from the high pressure fuel injection pump for meeting the dosing requirements at the exhaust. This obviates the need for a separate electric feed pump at exhaust for injecting fuel into the dosing module for DPF 102 regeneration.

[0011]It should be understood that embodiments explained in the description above are only illustrative and do not limit the scope of this invention in terms of the type of injector used and the material used for sealing washer. Many such embodiments and other modifications and changes in the embodiment explained in the description are envisaged. The scope of the invention is only limited by the scope of the claims.

CLAIMS
We Claim:
1. A device 100 for enabling hydrocarbon injection, said device 100 located
upstream to a diesel particulate filter (DPF) 102, said DPF 102 located along
exhaust path, said device 100 comprises at least:
an inlet port 104 in flow communication with a high pressure fuel
injection pump;
a pressurizing chamber 108 comprising a reciprocating plunger 110,
said pressuring chamber 108 adapted to receive fuel from said inlet
port 104; and
an outlet port 112 adapted to receive fuel from said pressurizing
chamber 108 and deliver said fuel to a dosing module of said DPF 102.
2. The device 100 of claim 1, wherein said reciprocating plunger 110 is driven by
engine crankshaft.