FIELD OF INVENTION:

[0001]The present invention relates to an engine driven machine having hydraulic and transmission combined loads on the engine and more particularly to a power management system (PMX) that functions during loading on a loader in specific and any machine that has a front loader and is used for loading in general.

BACKGROUND OF THE INVENTION
[0002]Hydraulic machines like hydraulic excavators, use engines to drive hydraulic pumps, which in turn provide hydraulic power to cylinders. The engine often operates at a fixed speed regardless of the actual instantaneous power requirement of the machine. Many earth moving vehicles use pressurized hydraulic fluid as a mechanism for performing work. For example, with a motor grader, an earth-engaging blade downwardly depending from a main frame may be lifted, rotated and tilted using hydraulic cylinders; while with an excavator, a boom arm may be articulated with first and second hinged arms and a bucket at the terminus of the arms.
[0003].Another example is a loader. A loader can be wheeled or track-type variety and include a lift arm hinged to the loader, with a rotatable bucket or other implement hinged to an end of the lift arm. A lift cylinder may be associated with the lift arm and a tilt cylinder may be associated with the bucket or other implements. The systems used in the prior art gave a large amount of power that could not be controlled by the hydraulic and transmission systems
[0004]US 8336232 B2A discloses a hydraulic system for an earth-moving vehicle may include first and second hydraulic cylinders, first and second hydraulic pumps and control valves including a combiner valve to modulate hydraulic fluid and pressure from the first and second hydraulic pumps to the first and second hydraulic cylinders as appropriate for the task being performed. If the task is digging, the first and second cylinders may be associated with tilting and lifting, respectively, and the control valves may be oriented so as to make each pump dedicated to one of the cylinders, and if demand is not being met, to then diminish power to the drivetrain to allow the tilting and lifting to be performed. If the task is not digging, the combiner valve can be opened to allow for cross-flow between the pumps and the cylinders.
[0005]The present invention addresses the shortcomings of the prior art by providing a power management system (PMX) that can be used during loading on a loader and has hydraulic and transmission combine loads on the engine .The instant invention is cost effective and fuel efficient system. With the help of the present invention energy demands of system can be optimized and smaller engine can be used or more functionalities can be achieved.

SUMMARY OF THE INVENTION:
[0006]The present invention relates to an engine driven machine having hydraulic and transmission combined loads on the engine, particularly to a power management system that functions during loading on a loader and any machine that has a front loader and is used for loading in general.
[0007]The primary objective of the invention is to provide a power management system(PMX) for the purpose of loading on a backhoe loader.
[0008]Another objective of the invention is to provide fuel efficient system.
[0009] Yet another objective of the invention is to provide cost effective system that can be applied to any engine driven machine having hydraulic and transmission combined loads.

BRIEF DESCRIPTION OF DRAWINGS
[0010] FIG 1. illustrates schematic view of power management system(PMX).

DESCRIPTION OF PREFERRED EMBODIMENT
[0011] FIG 1 illustrates schematic view of power management system(PMX) .The power management system has hydraulic and transmission combined loads on an engine driven machine for loading on a backhoe loader .The power management system comprises an Electric Control Unit 1, a hydraulic tank 9, an accelerated pedal sensor 5, an engine RPM sensor 4 , a valve block 11 , a solenoid unloader valve 3 ,a hydraulic cylinder 10, a pump 1 6, a pump 2 7, a pressure sensor 2, IC Engine 8.
[0012]The inputs of the Power Management System (PMX) are IC engine 8, an engine RPM sensor 4, a pump 1 6, a pressure sensor 2 and an accelerated pedal sensor 5.The inputs mentioned above are fed into the Electric Control Unit 1 and output is generated through a solenoid unloader valve 3, a hydraulic tank 9 and a pump 2 7.
[0013] In the power management system there is an electronic controller for managing power generation response within an electric drive system and to monitor the following parameters on the system
Engine RPM (below 1500)
System Hydraulic Pressure (100 – 300 bars) and has sensors
Accelerator Pedal Position
d(RPM)/ dt < 0
[0014]The controller determines the rate of drop of RPM with respect to load from the accelerator pedal sensor 5 and engine rpm input. If the difference of the rate of drop of RPM with respect to load is more than stall RPM and simultaneously the system hydraulic pressure is more than the preset pressure, this would indicate that the machine is under combined stall. In this condition the electronic controller would switch off hydraulic oil flow from one pump in the system by activating a solenoid 3 thus reducing the hydraulic load on the engine. In case the conditions are not true i.e. difference between desired and achieved rpms is small Revival RPM or hydraulic pressure is well within the working pressure range, then in this case the controller deactivates the solenoid 3 and full hydraulic flow is restored.

ALTERNATIVE EMBODIMENT
[0015]The accelerated pedal sensor 5 is a digital sensor as it is cost effective but said sensor can be analog also. The range defined above may vary according to the work machine
[0016] Although the subject matter has been described in considerable detail with reference to certain preferred embodiments thereof, other embodiments are also possible. As such, the spirit and scope of the disclosure should not be limited to the description of the preferred embodiment contained therein.
Referral Numerals
1 Electric Control Unit
2 Pressure Sensor
3 Solenoid Unloader Valve
4 Engine RPM Sensor
5 Accelerated pedal sensor
6 Pump 1
7 Pump 2
8 IC Engine
9 Hydraulic Tank
10 Hydraulic Cylinder
11 Valve Block

CLAIMS:

1. An efficient power management system installed in an engine driven machine comprising of:

At least one primary pump unit (6) for pumping hydraulic fluid from a hydraulic tank (9);
At least one auxiliary pump unit (7) for pumping hydraulic fluid from the hydraulic tank (9);
At least one internal combustion engine (8) connected to the primary and auxiliary pumps (6 & 7) ;
At least one engine RPM sensing unit (4) mounted on the engine (8);
At least one pressure sensor unit (2) mounted on the either of pumps (6 & 7) to measure hydraulic pressure across primary pump unit (6) or auxiliary pump unit (7) or both;
At least one electronic control unit (1) which receive inputs from an acceleration pedal sensor (5) and the engine RPM sensor ( 4) and the pressure sensor (2) mounted on the either of pumps (6 & 7) for further processing and sends output signals ;
At least one solenoid valve (3) mounted on the either of pumps (6 & 7) which receive the signals from the electronic control unit (1);
At least one hydraulic fluid pressure relief valve or control valve (11) for controlling the hydraulic fluid circulation; and
At least one work hydraulic cylinder (10) used for various work operations.

2. The efficient power management system claimed in claim1 ,wherein the solenoid valve (3) activates based on the electronic control unit (1) signals to dump the hydraulic fluid to the hydraulic tank (9) on
? Engine RPM detected by the engine RPM sensing unit (4) is less than a pre-determined engine RPM in the electronic control unit (1); and
? the acceleration pedal sensor (5) detects fully press situation of the acceleration pedal; and
? hydraulic pressure detected by the pressure sensor unit (2) mounted on the either of pumps (6 & 7) is more than a pre-determined hydraulic pressure in the electronic control unit (1).
3. The efficient power management system claimed in claim1 ,wherein the solenoid valve (3) activates based on the electronic control unit (1) signals to dump the hydraulic fluid to the hydraulic tank (9) on
? Engine RPM detected by the engine RPM sensing unit (4) is less than a pre-determined engine RPM in the electronic control unit (1); or
? the acceleration pedal sensor (5) detects fully press situation of the acceleration pedal; or combination of both.
4. The efficient power management system claimed in claim1 ,wherein the solenoid valve (3) activates based on the electronic control unit (1) signals to dump the hydraulic fluid to the hydraulic tank (9) on
? the acceleration pedal sensor (5) detects fully press situation of the acceleration pedal; or
? hydraulic pressure detected by the pressure sensor unit (2) mounted on the either of pumps (6 & 7) is more than a pre-determined hydraulic pressure in the electronic control unit (1); or combination of both.
5. The efficient power management system claimed in claim1 ,wherein the solenoid valve (3) activates based on the electronic control unit (1) signals to dump the hydraulic fluid to the hydraulic tank (9) on
? Engine RPM detected by the engine RPM sensing unit (4) is less than a pre-determined engine RPM in the electronic control unit (1); or
? hydraulic pressure detected by the pressure sensor unit (2) mounted on the either of pumps (6 & 7) is more than a pre-determined hydraulic pressure in the electronic control unit (1); or combination of both.

6. The efficient power management system claimed in claim1 ,wherein the solenoid valve (3) activates based on the electronic control unit (1) signals to deliver the hydraulic fluid to the work hydraulic cylinder (10) through the control valve (11) on
? Engine RPM detected by the engine RPM sensing unit (4) is more than the pre-determined engine RPM in the electronic control unit (1); or
? the acceleration pedal sensor (5) detects the acceleration pedal not pressed; or
? hydraulic pressure detected by the pressure sensor unit (2) mounted on the either of pumps (6 & 7) is less than the pre-determined hydraulic pressure in the electronic control unit (1).
7. The efficient power management system claimed in claim1 ,wherein the solenoid valve (3) activates based on the electronic control unit (1) signals to deliver the hydraulic fluid to the work hydraulic cylinder (10) through the control valve (11) on
? Engine RPM detected by the engine RPM sensing unit (4) is more than the pre-determined engine RPM in the electronic control unit (1); or
? the acceleration pedal sensor (5) detects the acceleration pedal not pressed; or combination of both.
8. The efficient power management system claimed in claim1 ,wherein the solenoid valve (3) activates based on the electronic control unit (1) signals to deliver the hydraulic fluid to the work hydraulic cylinder (10) through the control valve (11) on
? the acceleration pedal sensor (5) detects the acceleration pedal not pressed; or
? hydraulic pressure detected by the pressure sensor unit (2) mounted on the either of pumps (6 & 7) is less than the pre-determined hydraulic pressure in the electronic control unit (1); or combination of both.

9. The efficient power management system claimed in claim1 ,wherein the solenoid valve (3) activates based on the electronic control unit (1) signals to deliver the hydraulic fluid to the work hydraulic cylinder (10) through the control valve (11) on
? Engine RPM detected by the engine RPM sensing unit (4) is more than the pre-determined engine RPM in the electronic control unit (1); or
? hydraulic pressure detected by the pressure sensor unit (2) mounted on the either of pumps (6 & 7) is less than the pre-determined hydraulic pressure in the electronic control unit (1); or combination of both.