Claims:We Claim:
1. A method of controlling flow of fuel in an exhaust brake system, said exhaust brake system adapted to control flow of fuel into an engine cylinder, method comprising:

detecting (100), by a control unit an event of actuation of said exhaust brake;

detecting (102), by said control unit position of inlet port and exhaust port of said engine cylinder;

actuating (104), by said control unit a control valve, said control valve located upstream to said inlet port, said control valve enables flow communication of fuel with a fuel tank via a flow path.

2. The method of claim 1, wherein said control valve is a mechanically operated valve.

3. The fuel injection pump of claim 1, wherein said control valve is an electronically actuated valve.

, Description:Complete Specification:

The following specification describes and ascertains the nature of this invention and the manner in which it is to be performed.
Field of the invention
[0001]This invention relates to the field of exhaust brake system.

Background of the invention
[0002] In the current of mechanical fuel injection system we cannot control the injection during application of exhaust brake on in internal combustion engines. The exhaust brake blocks the path of the exhaust, causing an increase in pressure in the exhaust manifold. When the exhaust brake is applied exhaust is compressed, and fuel is being injected, the engine works backwards, slowing down the vehicle. The amount of negative torque generated is usually directly proportional to the back pressure of the engine. This leads to fuel that is let out as unburnt product and goes unused. This fuel which comes out as unburnt can create a flash/fire in exhaust system.

[0003]Prior art patent application JP58106146A discloses a safety device by fuel out and exhaust port shut. To perform a fuel cut and exhaust port shut with a single operation and prevent a secondary accident of a vehicle, by connecting a device actuating an exhaust brake and a device actuating a fuel out device of a fuel pump to a common control device. A safety device of a vehicle comprises an exhaust brake valve and fuel cut lever. If the driver depresses a pedal in case of emergency, an air control valve is opened to flow pressurized air into a control cylinder and actuate the valve. While a control rod 8 is moved downward to actuate a fuel cut lever of a fuel pump through a link lever and cable. In this way, emission of high temperature exhaust to the outside is prevented while fuel can be cut, and a secondary accident can be prevented.

Brief description of the accompanying drawing
[0004] Different modes of the invention are disclosed in detail in the description and illustrated in the accompanying drawing:

[0005] FIG. 1 a method of controlling flow of fuel in an exhaust brake system.

Detailed description of the embodiments
[0006] FIG. 1 a method of controlling flow of fuel in an exhaust brake system. The exhaust brake system is adapted to control flow of fuel into an engine cylinder. The method comprises, at step 100, detecting an event of actuation of the exhaust brake by a control unit. At step 102, the position of the inlet and exhaust port of the engine cylinder is detected by the control unit. The control unit actuates, at step 104, a control valve that is located upstream to the inlet port. The control valve enables flow communication with a fuel tank via a flow path. The control valve may be a mechanically operated valve or an electronically actuated valve.

[0007]The working of the exhaust brake system will be explained in further detail. This exhaust brake system comprises control valve. The function of the control valve here it to prevent flow of fuel into the engine cylinder during application of the exhaust brake. The control valve in the exhaust brake system functions like a bypass valve which will open during the application of exhaust brake. This valve can be activated/deactivated by a lever and springs mechanism, magnetic actuator or any other means of actuation. Consider the case when the user of a vehicle needs to actuate the exhaust brake. When the exhaust brake is applied, the control unit at step 100 detects the event of application of exhaust brake. At step 102, control unit detects the position of inlet port and exhaust port. This is required to so the during actuation of the exhaust brake, the inlet port and exhaust port must be closed so that there is no injection of fuel. The control unit then actuates 104 a control valve that is located upstream to the inlet port. The control valve enables flow communication of fuel with the fuel tank via the flow path. By enabling the fuel to flow via the flow path and into the fuel tank, the injection of fuel during application of exhaust brake is thus prevented.

[0008] By using the above mentioned method it is now possible to achieve better fuel economy, also, the problem of flash fire in the internal combustion engine may be avoided.

[0009]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 fuel injection pump. 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.