Combined computerised system of adjustment of thermal machine fuel adjustment

FIELD: engines and pumps.

SUBSTANCE: proposed system comprises fuel pump, fuel heater, thermal machine control component, booster valve, thermal machine coolant cooler and coolant pump. Said system additionally incorporates: first fuel metre to measure fuel temperature at high-pressure pumps inlets, second metre to measure output of thermal machine, third metre to measure temperature of fuel bled from fuel tank by fuel pump, two-way bypass valve arranged between fuel heater and coolant cooler; first, second and third setpoint adjusters and first, second and third comparators. Third comparator is connected with third metre and third setpoint adjuster. Second comparator is connected with second metre and second setpoint adjuster. First comparator is connected with first metre. First setpoint adjuster, second and third comparators and two-way bypass valve drive. First metre, first setpoint adjuster, and two-valve bypass valve with drive make temperature controller that regulates temperature in compliance with current temperature deviation from preset temperature. Second metre, second setpoint adjuster, and two-valve bypass valve with drive make temperature controller that regulates temperature in compliance with thermal machine power output disturbance (first disturbance). Third metre, third setpoint adjuster, third comparator and two-valve bypass valve with drive make temperature controller that regulates temperature in compliance with current temperature of fuel bled from fuel tank (second disturbance) Functions of first, second and third setpoint adjusters, first, second and third comparators are fulfilled by microprocessor controller that ensure required static and dynamic operating parametres of proposed system in compliance with programmed algorithms.

EFFECT: higher fuel efficiency.

3 dwg

 

The technical field to which the invention relates.

The invention can be applied to heat engines, in particular internal combustion engines, and can be used in the operation of diesel engines running on viscous or low-viscosity fuels.

The level of technology

The known system, a collection of characteristics which are similar to the set of essential features of the invention.

A known fuel heating system locomotive diesel [diesel Locomotive TEM./ Avinadav, Gselection, Lajjalu and others - M.: Transport, 1989. - pp.96-102], which contains the fuel tank, filter, fuel, fuel pump with safety valve, toplivopodachej associated with the cooling system of diesel engine, filter, fuel, fuel pumps of a high pressure nozzle, retaining valve, the pipelines.

The disadvantages of this manual heating fuel is a significant dependence of the temperature of the fuel before the fuel pumps of high pressure from the cooling water temperature of the diesel engine at the entrance to toplivopodachej, from outdoor air temperature (i.e. the temperature of the fuel pick up fuel pump from the fuel tank), fuel flow through toplivopodachej (i.e. from power diesel), as well as from those who lateinisch parameters and characteristics of toplivopodayuschaya. This manual, the fuel heating system may not provide the desired temperature of the fuel before the fuel high-pressure pump. Heating system fuel shall apply only to raise the temperature of the fuel in the fuel tank in the cold season, because at low temperature the fuel from it are waxy substances that clog pipes, fittings and especially the filters.

The known method the power of the internal combustion engine, which consists in the fact that in order to increase the efficiency change of the temperature of the fuel before the fuel high-pressure pump depending on the engine operation mode is linear from 70 to 20°C in accordance with the increase in load from idle up to a nominal mode of operation of the engine [the Way of the power of the internal combustion engine. As the USSR №1560767, CL F02M 53/00, 1990]. This invention provides technical solutions for the implementation of the proposed method.

The analogue of the present invention is closest to him in essential characteristics (prototype)

Known mixer with automatic temperature controller of the fuel in the fuel injection system of diesel engine [Mixer with automatic temperature controller of the fuel in the fuel injection system of the diesel engine. RF patent №2094644, CL 6 F02M 37/00, 1997]. This mixer is heated is about and unheated fuel includes a housing with intake and drainage channels and the guide tube, cylindrical Cup mounted on the housing coaxially with the latter, a conical funnel with a cylindrical socket mounted for movement along the axis of the guide tube and the tube and the guide tube is made holes with bypass drainage of heated fuel directly into the guide pipe, the mixer is equipped with a temperature sensor with a temperature-sensitive element mounted in the intake channel coaxial with the guide tube, the sleeve is installed with the possibility of interaction of the tapered sleeve, and the last holes with messages guide tube with intake channel; and the axis of the holes in the pipe, the guide pipe and the sleeve angled to the axis of the guide tube.

The first significant disadvantage of this known device is that the temperature of the fuel in the intake channel, and means at the inlet to the fuel pump of a high pressure, varies in the range of 30-40°C and does not depend on the power of diesel engine, and depends only on the temperature of the fuel in the fuel tank and the fuel economy of a diesel engine.

Another significant disadvantage of this known device is that it control the temperature of the applied temperature sensor with solid filler ceresin. It is known [Bows NM Carried out the systematic regulation of the temperature of the engine. - M.: Mashinostroenie, 1995 (p.92-98)], such that the temperature sensors in water have high inertia. It is obvious that the inertia of the fuel will be more, since the coefficient of heat transfer from the fuel to the sensor is less than from the water to the sensor. The increased inertia of the temperature sensor decreases the stability and quality system temperature control, leads to fluctuations of temperature in a wide range. Significant dynamic asymmetry and ambiguity of the static characteristics of the temperature sensors with solid filler also reduces the resistance and degrade the quality of the systems temperature control.

The invention

As you know, any automatic system contains two main functional parts: the object of regulation of the PRS and the automatic regulator AR. Any automatic regulator AR contains two main series-connected functional parts: the governing body of the PP and a regulating device for ER. The governing body of the PP contains devices: measurement (PS), define (ZU)comparing (SU), amplification-transforming (CU). In turn, a regulating device ADT contains two main series-connected functional parts: actuator THEM and the regulatory authorities is n RO.

Functional diagram of the proposed automatic combination of a microprocessor system the temperature control of the fuel thermal machine presented in figure 1. Indicate on the diagram: PR (POS.1) is the object of the regulation; EU (pos.2) and measuring device (sensor controlled quantity φ); U (3), IW (pos.4) - measuring devices (sensors) of the main disturbing influences λ1and λ2; SU (5), 2ND (pos.6), SS3 (pos.7) - comparing device; CH1 (pos.8), CH2 (position 9), SU (pos.10) - setting device (referencing the specified values); RO (pos.11) - regulatory authority; (pos.12) - actuator; IRA (POS) - Executive-regulating device; µ - regulating effect on the PR; hthem- output signal; xl÷3- output signals of the sensors; xl÷3- output signals of the control devices; Δsu- output signals SU; ηl÷3the reference signals.

The principal block diagram of the automatic combination of a microprocessor system the temperature control of the fuel thermal machine (see figure 2) contains the following main elements: fuel tank 14, the coarse filter fuel 15, fuel pre-supply pump 16, the relief valve 17, toplivopodachej 18, sensor 2 temperature T1fuel inlet of the fuel pumps of a high pressure heat engine 19, iltr thin clearing of fuel 20, the two-way bypass valve 11 with the actuator 12, the governing body 21 of a heat engine, a retaining valve 22, a cooler 23 cooling medium of a heat engine, the pump 24 cooling medium of a heat engine, the sensor 4 temperature T4fuel pick up fuel pump 15 from the fuel tank 14, a microprocessor controller (IPC) 25 that is connected to the sensors 2 and 4 and the governing body 21, and the actuator 12 of the valve 11. In figure 2 the notation T2and T3- corresponds to the temperature of the cooling medium at the outlet of a heat engine and at the entrance to her.

In the proposed combined automatic microprocessor control system, fuel temperature thermal machine as PR performs the fuel heating system (TMS), function IU performs sensor 2 temperature T1fuel inlet of the fuel pumps of a high pressure thermal machines; function IU performs the sensor 3 to the power of Nea heat engine that is part of the governing body 21, the function U sensor 4 temperature T4fuel taken from the fuel tank 14; function RO performs the two-way valve 11; and the functions THEY drive 12 of the valve 11. The temperature sensors 2 and 4 low-inertia electric. The functional elements of a regulatory system IU, CH1, SU, IT and RO form a temperature controller according to the deviation adjust the second temperature from the setpoint, functional elements U, CH2, 2ND, and RO - temperature controller according to the power of Ne(by perturbing influence of λ1heat machine, and functional elements of IOS, THUS, CPS, it and RO - temperature regulator on the fuel temperature T4withdrawn from the fuel tank (on the perturbing influence of λ2). The controller according to the deviation together with the PR form a closed circuit in the system of regulation and regulators on disturbances - open contours. In the proposed system the functions of all master devices CH1, CH2 AND SO and comparing devices SW, 2ND AND SS3 performs microprocessor controller 25.

In the proposed combined automatic microprocessor control system, fuel temperature of a heat engine uses two additional control signal: the power of Nea heat engine and the temperature of the fuel taken from the fuel tank T4so this system is a combined automatic microprocessor control system with signal compensation basic perturbation λ1and λ2: the power of Ne(fuel consumption) of a heat engine and the temperature of the fuel taken from the fuel tank T4. The use of additional control signals allows to obtain the desired static characteristic of the system is s temperature control of the fuel with negative static irregularity in the power of N eand the static non-uniformity equal to zero, the temperature of the fuel taken from the fuel tank T4as seen on the static characteristic of the automatic combination of a microprocessor system the temperature control of the fuel thermal machine presented in figure 3, and significantly increase system stability and quality of its work (relative overshoot, the time regulation and others), that is to reduce the amplitude of the temperature T1fuel inlet to the fuel pumps a heat engine.

We offer combined automatic microprocessor control system fuel temperature of a heat engine in accordance with the algorithms, implemented in the program for the microprocessor-based controller 25 operates as follows.

If the value is adjustable fuel temperature T1equal to the maximum value of TMax(70°C), when the power of Nethermal machine, equal power idling at a temperature T4fuel taken from the fuel tank, is equal to TMinoutput signal of the temperature sensor 2 IT1maximum, and the temperature sensor 4 - IT4- minimum. The output signal of microprocessor controller 25 IIPChas a maximum value when the output signal of the actuator 12 who meet the maximum value and the valve 11 is fully open, providing a maximum flow rate of Qmaxthe cooling medium of a heat engine 19 through toplivopodachej 18. This is the maximum possible fuel heating.

If the capacity c of a heat engine 19 will start to increase, this leads to an increase of the output signal of the IPPthe governing body 21 and to the decrease of the output signal of the IIPCmicroprocessor controller 25, which in turn leads to a reduction of the flow Q of the cooling medium of the heat of the machine through toplivopodachej 18, to reduce heat in toplivopotreblenie 18 and to reduce the temperature T1. This change in the flow rate Q of the cooling medium of the heat of the machine through toplivopodachej 18 happens every time you change the power of Nea heat engine 19.

The increase in the temperature of the fuel taken from the fuel tank T4leads to the increase of the output signal of the IT4a temperature sensor 4, to decrease the output signal of the IIPCmicroprocessor controller 25. This in turn leads to a reduction of the flow Q of the cooling medium of a heat engine 19 through toplivopodachej 18 and to the reduction of heat sink in toplivopotreblenie 18. This change in the flow rate Q of the cooling medium of a heat engine 19 through toplivopodachej 18 occurs whenever a change in fuel temperature Tsub> 4withdrawn from the fuel tank. In the adjustable fuel temperature T1remains constant when changing the fuel temperature T4withdrawn from the fuel tank, in a wide range.

Thus, changes in the power of Nea heat engine 19 or fuel temperature T4withdrawn from the fuel tank, lead to corresponding changes in the flow rate Q of the cooling medium of a heat engine 19 through toplivopodachej 18 while maintaining a controlled temperature T1at a given level (in accordance with the static characteristic is presented on figure 3), i.e. Q (T1NeT4). This combined control of temperature T1using additional control signals on the power of Neand temperature T4that is summed with the signal at the regulated temperature T1in accordance with the algorithm incorporated in the work program of the microprocessor of the controller 25 provides accurate maintaining it at a given level without hesitation and increases the efficiency of a heat engine.

The technical result - the fuel efficiency of a heat engine by providing the optimal values of the temperature of the fuel before the fuel high-pressure pump depending on the mode of operation of the machine and independently researched the mo from the conditions of its operation.

We offer combined automatic microprocessor control system fuel temperature thermal machine does not have the disadvantages inherent in the known systems of heating fuel. The temperature of the fuel before the high pressure pump diesel leads, on the one hand, to improve the quality of mixing, reduce the time of preparation of the fuel, and on the other hand, causes deterioration of the characteristics of the law of supply fuel. The combination of these factors has an impact on fuel consumption diesel, which varies differently depending on the capacity. Experimentally determined linear dependence of the temperature of the fuel before the high pressure pump diesel from his power: when operating a diesel engine at idle, this temperature should be 70°C, at rated power fuel temperature must be 20°C. Thus, the automatic control system fuel temperature thermal machines must have a negative static uneven power equal to 50°C.

The technical result is achieved due to the fact that the combined automatic microprocessor control system fuel temperature thermal machine that contains the fuel tank, filter, fuel, fuel pump, relief valve, obligatoriament, the filter of thin clearing of fuel, the governing body of a heat engine, retaining valve, chiller cooling medium of a heat engine, pump, cooling medium heat machine, further comprises: a first measuring device for measuring the fuel temperature at the inlet to the fuel pumps of a high pressure heat engine; a second measuring device for measuring power of a heat engine; a third measuring device for measuring the temperature of the fuel pick up fuel pump from the fuel tank; two-way bypass valve with actuator mounted between toplivopotreblenie and cooler cooling medium of a heat engine; first, second and third setting device; the first, the second and the third comparing unit. The third compares the device is associated with the third measuring device and the third driving device. Second comparing device is associated with the second measuring device and the second driving device. First comparing device connected with the first measuring device, the first driving device, the second and the third comparing devices, and drive the two-way bypass valve. The first measuring device, the first setting device, personnalisee device, the two-way bypass valve with actuator form a temperature controller according to the deviation of the controlled temperature from the setpoint. The second measuring device, the second setting device, the second comparing device, two-way bypass valve with actuator form a temperature controller for heat machine (first disturbing effects). The third measuring device, the third driver, the third comparing unit, the two-way bypass valve with actuator form a temperature controller the temperature of the fuel taken from the fuel tank (second perturbing effects). Functions of the first, second and third sets of devices, first, second and third comparing device performs a microprocessor controller that provides, in accordance with the algorithms embedded in its work program, the required static and dynamic characteristics of automatic combination of a microprocessor system the temperature control of the fuel thermal machine.

List of drawings

Figure 1. Functional diagram of the automatic combination of a microprocessor system the temperature control of the fuel thermal machine.

Figure 2. The principal block diagram of the proposed automatic combined microprocessor systemrequirement fuel temperature of a heat engine.

Figure 3. Static characteristic of the automatic combination of a microprocessor system the temperature control of the fuel thermal machine.

Literature

1. Bows NM Fundamentals of automation and automation of diesel locomotives. - M.: Transport, 1989.

2. Locomotive TEM. / Avinadav, Gselection, Lajjalu and others - M.: Transport, 1989. - 295 S.

3. The way the power of the internal combustion engine. As the USSR №1560767, CL F02M 53/00, 1990.

4. Mixer with automatic temperature controller of the fuel in the fuel injection system of the diesel engine. RF patent №2094644, CL 6 F02M 37/00, 1997.

5. Bows NM Automatic temperature control engines. - M.: Mashinostroenie, 1977.

Automatic combined microprocessor system the temperature control of the fuel thermal machine that contains the fuel tank, filter, fuel, fuel pump, relief valve, toplivopodachej, the fuel fine filter, the governing body of a heat engine, retaining valve, chiller cooling medium of a heat engine, pump, cooling medium of a heat engine, characterized in that it further comprises: a first measuring device for measuring the fuel temperature at the inlet to the fuel pumps of a high pressure heat engine; a second measuring device that is destined is Achensee to measure the power of a heat engine; a third measuring device for measuring the temperature of the fuel pick up fuel pump from the fuel tank; two-way bypass valve with actuator mounted between toplivopotreblenie and cooler cooling medium of a heat engine; first, second and third setting device; the first, second, and third comparing device; the third compares the device is associated with the third measuring device and the third driving device, the second comparing device is associated with the second measuring device and the second driving device, and the first comparing device connected with the first measuring device, the first driving device, the second and the third comparing devices, and drive the two-way by-pass valve; the first measuring device, the first setting device, the first comparing device, two-way bypass valve with actuator form a temperature controller according to the deviation of the controlled temperature from the set value; a second measuring device, the second setting device, the second comparing device, two-way bypass valve with actuator form a temperature controller for heat machine (first disturbing effects); the third measuring device Tr is Thiey specifies the device third comparing unit, the two-way bypass valve with actuator form a temperature controller the temperature of the fuel taken from the fuel tank (second disturbing influence); and the function of the first, second and third sets of devices, first, second and third comparing device performs a microprocessor controller that provides, in accordance with the algorithms embedded in its work program, the required static and dynamic characteristics of automatic combination of a microprocessor system the temperature control of the fuel thermal machine.



 

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