The present invention is related to 'CNG Injection Strategy, based on Exhaust Gas Temperature in Dual Fuel (Diesel +CNG) Engine in part load condition for tractor application'. Said CNG injection system is based on Exhaust temperature sensor output in dual fuel (Diesel+ CNG) engine at part load conditions for tractor application. The customized assembly of the said CNG injection system with the duel fuel engine and its peripheral components towards realizing the said strategy of CNG injection, particularly for application in tractor, comprises Engine Cylinder Head, Intake Manifold, Exhaust Manifold, CNG Injector, CNG Pressure Regulator, CNG Supply Tank, ECU, Exhaust Temperature Sensor, Diesel Fuel Supply Tank and Diesel Injector; wherein said CNG injection strategy, based on exhaust gas temperature, in duel fuel engine is characterized in the followings:
• Load condition estimation based on exhaust gas temperature; and
• CNG injection quantity to be governed based on exhaust gas temperature.
Exhaust temperature sensor is mounted on exhaust elbow to sense the exhaust gas temperature. At any constant speed if the load is changed subsequent change in exhaust gas temperature is observed. By using temperature sensor exhaust gas temperature is sensed. Such an input is

given to ECU and accordingly injection quantity is varied. This approach is used for part load conditions during operation.
Background and object of the present invention:
Conventionally, in dual fuel engine, diesel fuel quantity is controlled by mechanical inline injection pump with throttle rack and governor arrangement. To control CNG electronic FI (fuel injection) system is used. In existing technology, the CNG fuel control was based on throttle position sensor input.
It has been observed by the inventor herein that in the duel fuel engines, particularly to be used in tractors, exhaust gas temperature changes with respect to change in load condition of an engine. So vice-e-versa this exhaust gas temperature can be used to estimate the change in load condition of an engine. Based on this input CNG injection can be varied as per required loading condition.
Apart from mechanism of mechanical inline injection pump with throttle rack and governor arrangement, the prior Patent US10287943B1 describes a system for an HHDD engine comprising a dual fuel system, said dual fuel comprising diesel fuel and natural gas, an up-fit after-treatment system, wherein operation of said system for the HHDD engine reduces diesel fuel consumption, exhaust C02 and NOx emissions as compared to an HHDD engine not equipped with said system, oxidizes NMHC and CO, and filters particulate matter at least to meet CARB Title 13. CCR. Section 2025 mandate 2010 for emission regulatory standard levels (the "Mandate") said system for the HHDD engine further comprising an exhaust thermal

management system to facilitate rapid DOC and SCR thermal activation, as compared to an HHDD engine not equipped with said system for the HHDD engine, said exhaust thermal management system further comprising a pre-DOC CH4 sensor, pre-DOC NG injector, pre-DOC igniter, post DOC/DPF CH4 sensor, Pre-SCR NG injector, pre-SCR igniter, pre-SCR temp sensor and at least one ECM controller, said after treatment system comprising a diesel oxidation catalyst, a diesel particulate filter, and a selective catalytic reduction system, said after treatment system injecting an amount of a diesel exhaust fluid comprising a urea compound upstream of the selective catalytic reduction system to reduce at least a portion of said NOx emission to N2 and C02 and H20.
Therefore, the prime objet of the present invention is to provide a CNG Injection mechanism for Dual Fuel Engine used in tractor igniting diesel and CNG; wherein the CNG injection is based on Exhaust Gas Temperature in Dual Fuel (Diesel +CNG) Engine in part load condition.
Another object of the present invention is to provide a CNG injection mechanism for the duel fuel (Diesel +CNG) engine in a tractor, characterized in the following steps:
• Load condition estimation based on exhaust gas temperature.
• CNG injection quantity to be governed based on exhaust gas temperature.
Another object of the present invention is to provide such a CNG injection mechanism for the duel fuel (Diesel +CNG) engine in a tractor, wherein the exhaust temperature sensor is mounted on exhaust elbow to sense the

exhaust gas temperature; and wherein further at any constant speed if the load is changed, subsequent change in exhaust gas temperature is observed. Such an input is given to ECU and accordingly injection quantity is varied. This approach is used for part load conditions during operation.
SUMMARY OF THE INVENTION:
The present invention is related to 'CNG Injection Strategy based on Exhaust Gas Temperature in Dual Fuel (Diesel +CNG) Engine in part load condition for tractor application'.
The customized assembly of the said duel fuel engine and its peripheral components towards realizing the said strategy of CNG injection, particularly for application in tractor, comprises Engine Cylinder Head, Intake Manifold, Exhaust Manifold, CNG Injector, CNG Pressure Regulator, CNG Supply Tank, Electronic Control Unit (ECU), Exhaust Temperature Sensor, Diesel Fuel Supply Tank and Diesel Injector; wherein said CNG injection strategy, based on exhaust gas temperature, in duel fuel engine is characterized in the followings:
• Load condition estimation based on exhaust gas temperature; and
• CNG injection quantity to be governed based on exhaust gas temperature.
Exhaust temperature sensor is mounted on exhaust elbow to sense the exhaust gas temperature. At any constant speed if the load is changed subsequent change in exhaust gas temperature is observed. By using temperature sensor exhaust gas temperature is sensed. Such an input is

given to ECU and accordingly injection quantity is varied. This approach is used for part load conditions during operation.
DESCRIPTION OF INVENTION
Subject matter invention is substantially described and illustrated with the help of accompanying drawing hereinbelow.
Short details of the drawing:
Figure 1: Represents the schematic plan for assembly of components towards realizing the instant CNG injection strategy, based on Exhaust Gas Temperature in Dual Fuel (Diesel +CNG) Engine, preferably in part load condition for tractor application.
The numerical references used in the said Figure 1, indicating the structural and/or functional components assembled together towards realizing the instant CNG injection strategy, based on Exhaust Gas Temperature in Dual Fuel (Diesel +CNG) Engine, preferably in part load condition for tractor application, are as under:-

Reference Numerals Constructional/structural feature of the instant inventive concept relating to the CNG Injection Strategy based on Exhaust Gas Temperature in Dual Fuel (Diesel +CNG) Engine in part load condition for tractor application
1 Engine Cylinder Head
2 Intake Manifold
3 Exhaust Manifold
4 CNG Injector

5 CNG Pressure Regulator
6 CNG Supply Tank
7 ECU (Electronic Control Unit)
8 Exhaust Temperature Sensor
9 Diesel Fuel Supply Tank
10 Diesel Injector
11 Electrical Circuit
12 CNG Gas Flow
13 Diesel Fuel Flow
The customized assembly of the said duel fuel engine and its peripheral components towards realizing the said strategy of CNG injection, particularly for application in part load condition of a tractor, comprises Engine Cylinder Head (1), Intake Manifold (2), Exhaust Manifold (3), CNG Injector (4), CNG Pressure Regulator (5), CNG Supply Tank (6), Electronic Control Unit (ECU) (7), Exhaust Temperature Sensor (8), Diesel Fuel Supply Tank (9) and Diesel Injector (10). The overall assembly for the said CNG injection system includes the electrical circuit (11), CNG gas flow line (12) and the diesel fuel low line (13), as indicated in the Figure 1. The Figure 1 represents a novel CNG injection mechanism, applicable for those engines, which are provisioned to burn two kind of fuel, one diesel (in liquid form) and another as compressed natural gas (CNG) (in gaseous form); preferably applicable in part load condition in a tractor. The operation of the said CNG injection mechanism and its efficacy are particularly based on the exhaust gas temperature and the response of the exhaust temperature sensor applied therein.

Said CNG injection strategy, based on exhaust gas temperature, in duel fuel engine is characterized in the followings:
• Load condition estimation based on exhaust gas temperature; and
• CNG injection quantity to be governed based on exhaust gas temperature.
CNG injection Strategy, as described and illustrated herein, the CNG gas flow line (12) initiates from the CNG Supply Tank (6) and duly regulated by the CNG Pressure Regulator (5) and using the CNG injector (4) CNG flow is injected into the intake manifold (2) so as to effectively reach to the Engine Cylinder Head (1). In the duel fuel igniting engine, the Engine Cylinder Head (1) is also provisioned to receive the diesel fuel flow (13), piped from the diesel supply tank (9) through the diesel fuel injector (10). Thus the instant CNG Injection Strategy is so designed to further regulate the flow of at least one fuel (that is the CNG herein) and the overall fuel efficiency of the vehicle (preferably a tractor), by monitoring the exhaust gas temperature in the Exhaust Manifold (3), particularly by using an exhaust temperature sensor (8) at the exhaust elbow.
Exhaust temperature sensor (8) is mounted on exhaust elbow to sense the exhaust gas temperature. At any constant speed if the load is changed subsequent change in exhaust gas temperature is observed. By using temperature sensor (8) exhaust gas temperature is sensed. Such an input is given to ECU (7) and accordingly injection quantity is varied. This approach is used for part load conditions during operation.

Actually, under the instant invention, conventionally existing diesel engine has been upgraded to dual fuel (diesel + CNG) engine in tractor application. Accordingly the overall construction of the engine block and its peripheral components, including the CNG injector (4) as well as diesel injector (10) are redesigned and customized. For injecting diesel, conventional mechanical FI (fuel injection) system is conventionally used. Contrary to the convention fuel injection system, CNG in the said duel fuel engine is injected with such an electronic FI system wherein one fuel is CNG and another fuel selected is diesel. Various inputs are required to be sent to ECU (7) to understand working condition of engine, particularly the Exhaust temperature changes with the change in load at particular speed. This input is used to estimate the load condition in this project. By using exhaust temperature to predict the load CNG injection has been ensured.
It is to be noted that the present invention is susceptible to modifications, adaptations and changes by those skilled in the art. Such variant embodiments employing the concepts and features of this invention are intended to be within the scope of the present invention, which is further set forth under the following claims:-

WE CLAIM:

1. CNG injection Strategy, based on Exhaust Gas Temperature in Dual
Fuel (Diesel +CNG) Engine, preferably in tractor application in part
load condition; wherein the customized assembly of the said CNG
injection system in the duel fuel engine and its peripheral components
towards realizing the said CNG injection strategy comprises Engine
Cylinder Head (1), Intake Manifold (2), Exhaust Manifold (3), CNG
Injector (4), CNG Pressure Regulator (5), CNG Supply Tank (6),
Electronic Control Unit (ECU) (7), Exhaust Temperature Sensor (8),
Diesel Fuel Supply Tank (9) and Diesel Injector (10); wherein said
CNG injection strategy, based on exhaust gas temperature, in duel
fuel engine is characterized in the followings:
• Load condition estimation based on exhaust gas temperature; and
• CNG injection quantity to be governed based on exhaust gas temperature.

2. CNG injection Strategy in Dual Fuel (Diesel +CNG) Engine, as claimed in the claim 1, is based on Exhaust temperature sensor output in dual fuel (Diesel+ CNG) engine at part load conditions for tractor application.
3. CNG Injection system in Dual Fuel (Diesel +CNG) Engine, as claimed in the claim 1, wherein the customized assembly of the said CNG injection system in the duel fuel engine and its peripheral components

towards realizing the said strategy of CNG injection, particularly for application in tractor, comprises Engine Cylinder Head (1), Intake Manifold (2), Exhaust Manifold (3), CNG Injector (4), CNG Pressure Regulator (5), CNG Supply Tank (6), ECU (7), Exhaust Temperature Sensor (8), Diesel Fuel Supply Tank (9) and Diesel Injector (10); wherein said CNG injection strategy, based on exhaust gas temperature, in duel fuel engine is characterized in the followings:
• Load condition estimation based on exhaust gas temperature; and
• CNG injection quantity to be governed based on exhaust gas temperature.

4. CNG Injection system in Dual Fuel (Diesel +CNG) Engine, as claimed in the claim 1, wherein exhaust temperature sensor (8) is mounted on exhaust elbow to sense the exhaust gas temperature.
5. CNG injection Strategy, as claimed in claim 1, wherein at any constant speed if the load is changed, subsequent change in exhaust gas temperature is observed by the said exhaust temperature sensor (8), which supplies its input to the ECU (7) and accordingly injection quantity is varied.
6. CNG Injection Strategy in Dual Fuel (Diesel +CNG) Engine, as claimed in the claim 1, as indicated in the Figure-1, as under:-

1. Engine Cylinder Head
2. Intake Manifold
3. Exhaust Manifold
4. CNG Injector
5. CNG Pressure Regulator
6. CNG Supply Tank
7- ECU
&. Exhaust Temperature Sensor
?- Diesel Fuel Supply Tank
10, Diesel injector
Electrical Circuit
—•— CNG Gas. Flow
Diesel Fuel Flow


Fig. 1:- Schematic Diagram 7. CNG injection Strategy, as claimed in claim 1, wherein:
• the CNG gas flow line (12) initiates from the CNG Supply Tank (6) and duly regulated by the CNG Pressure Regulator (5) and using the CNG injector (4) CNG flow is injected into the intake manifold (2) so as to effectively reach to the Engine Cylinder Head (1);
• In the duel fuel igniting engine, the Engine Cylinder Head (1) is also provisioned to receive the diesel fuel flow (13), piped from the diesel supply tank (9) through the diesel fuel injector (10);
• Thus the instant CNG Injection Strategy is so designed to further regulate the flow of at least one fuel (that is the CNG

herein) and the overall fuel efficiency of the vehicle (preferably a tractor), by monitoring the exhaust gas temperature in the Exhaust Manifold (3), particularly by using an exhaust temperature sensor (8) at the exhaust elbow.