Automatic combined microprocessor-based temperature controller of transport vehicle power plant

FIELD: engines and pumps.

SUBSTANCE: automatic combined microprocessor-based temperature controller incorporated with the vehicle power plant comprises AC current source, control element with temperature pickup, two identical induction motors with phase rotors and stator windings connected to electric power source. Rotor windings are connected in series via resistors; rotor and stator shafts are linked up with cooling fan shaft. Rotary stator of one of the induction motors is linked up with control element. Proposed device additionally comprises power plant output pickup, ambient cooling air temperature pickup and stator turn angle pickup connected to microprocessor controller inputs. Induction motor stator turning mechanism is connected to one of the controller outputs. Saturation throttle operating windings (magnetic amplifiers) are connected parallel to resistors that connect induction motor rotor windings, control windings of the former being connected to the second output of microprocessor controller via control unit. In compliance with another version of the temperature controller, induction motor rotor windings are connected in series via emitter-collector junctions of the transistors with their bases and emitters connected to aforesaid second output of microprocessor controller control transistor control unit.

EFFECT: automatic combined microprocessor-based temperature controller incorporated with the vehicle power plant.

2 cl, 5 dwg

 

The technical field to which the invention relates.

Automatic combined microprocessor temperature controller power unit of the vehicle relates to the transport industry, in particular to automatic systems the temperature regulation (vysokonogoye items, water, oil, charge air, and other heat engines, the windings of electrical machines, transformers, elements of semiconductor converters and others) in the cooling systems of power plants vehicles (locomotives, cars, tractors and other).

The level of technology

Known automatic temperature controls, a collection of characteristics which are similar to the set of essential features of the invention.

Known automatic control of coolant temperature power plant comprising as the governing body of the pneumatic temperature Converter with a power amplifier, and as a regulating device is a membrane spring actuator and fan with electric motor and rotary blades [Bows NM automation of diesel and gas turbine-electric locomotives and diesel trains. - M.: Mashinostroenie, 1988, s].

Also known automatic microprocessor reg is a torus temperature of the traction electric machine, containing a microprocessor governing body with the current sensor and the sensor voltage controlled winding of the traction electric machine, the principle of which is based on the dependence of the resistance of the controlled winding from its temperature, the amplifier output signal of the microprocessor of the governing body, the transducer electrical signal into a pneumatic, power amplifier, diaphragm spring actuator, axial fan with a mechanical drive and rotary blades [A.S. P.O. box Automatic temperature control windings of the traction electric machines locomotives. - M.: the Route, 2005, pp.182-191].

A common disadvantage of these temperature controllers is that they are static, i.e. P-regulators. Automatic temperature control traction electric machines, as well as automatic temperature control power plants, with P-regulators are also static. Static system supports adjustable temperature T1within a static non-uniformity (Fig 1. Static features automatic temperature control: 1-e P-regulator at T2; 2-e P-regulator at TMax; 3 and 4 - with a combined temperature regulators the tours), resulting adjustable temperature T1changes like changing the power N power plant, and when the temperature of the external cooling air T2(feature 1 in figure 1). However, automatic temperature control windings of electrical machines, transformers and elements of semiconductor converters must maintain a constant temperature regardless of changes in the power N of the power plant and the temperature of the external cooling air T2(feature 3 in figure 1). The constancy of temperature of the windings of electrical machines, transformers and elements of semiconductor converters provides a higher reliability of electrical machines, transformers and elements of semiconductor converters and lower energy costs for cooling than with temperature fluctuations.

Automatic temperature control vysokonogoye items, water, oil, charge air and other power plants must maintain the temperature in a certain relation to power N power plant and regardless of the temperature of the external cooling air T2(feature 4 in figure 1), which reduces engine fuel consumption, increase its reliability and Eisenia of energy consumption for cooling of the engine.

In order automatic temperature control could have a static characteristics 3 and 4, presented in figure 1, they shall contain a combination of temperature controllers, using additional control signals according to the power N power plant and the temperature of the external cooling air T2. For automatic temperature regulation system had static characteristics 3 and 4, presented in figure 1, should be used for more control signals according to the power N power plant and the temperature of the external cooling air T2.

The prior art closest to it in essential characteristics (prototype)

As a prototype of the proposed invention the selected automatic temperature controller with electric actuator fan AC [RF patent 2241837, temperature Controller energy vehicle setup/ Nmeav, Assomigliante, Iaaiiinou. - Publ. 10.12.04., B. I. No. 34]. It is a regulator of the temperature T1power plant of the vehicle containing the power source AC, the governing body with a temperature sensor, cooling fan and two asynchronous motor with slip-ring rotor is mi, the stator windings are connected to a power source, the rotor windings are connected in series with resistors and a shaft connected with the shaft of the cooling fan; the stator of one of the asynchronous motors are pivoted and connected to the rotation mechanism connected to the control authority. This regulator also has a major drawback, which is the following. In the circuit of the rotor windings of induction motors always-on resistance Rdresistors, so the maximum speed of the drive of the cooling fan is limited to the velocity that is less than the rated value by 6-10%. Increased slip s results when the angle of rotation of the stator β=180 electrical degrees to the corresponding reduction (6-10%) efficiency drive of the cooling fan and to the work when the power is less than the nominal. All this reduces the technical-economic indicators of the temperature controller. The easiest way to eliminate this drawback temperature controller with electric actuator fan AC is increasing the drive speed of the cooling fan by shunting with small slides additional resistors in the rotor circuit. To reduce the surge current and torque necessary to smoothly decrease the resistance in the circuit of the mouth of the situations of the windings in the rotation angle of the stator β somewhat less, than 180°. This smooth decrease of resistance in the circuit the rotor windings can be accomplished in two ways: by connecting in parallel with the resistors connecting the rotor winding, managed inductance of the saturable reactors (magnetic amplifier) (first method) and by connecting the rotor windings through a transistor - controlled semiconductor resistor (the second method).

The invention

Offer automatic combined microprocessor temperature controller power unit of the vehicle in the first method of reducing resistance in the circuit the rotor windings contains the following main elements (figure 2. The principal block diagram of the proposed automatic combined microprocessor temperature controller power unit of the vehicle with the saturable reactors in the circuit of the rotor windings of asynchronous motors): sensor 1 adjustable temperature T1power plant, sensor 2 power N power plant, sensor 3, the temperature of the external cooling air

T2and the sensor 4 angle β stator connected to the inputs of microprocessor controller 5, one of the outputs of which are connected mechanism 6 regards the PTA stator induction motor 7, shaft which is connected to the shaft of the second asynchronous motor 8 and the shaft of the cooling fan 9, the stator windings of induction motors connected to the power source 10, and the rotor winding are connected in series through resistor 11, which are connected in parallel to the secondary (working) winding 12 of the saturable reactors (magnetic amplifier) 13, a control winding 14 which is connected to the second output of the microprocessor of the controller 5 through the control unit 15.

Offer automatic combined microprocessor temperature controller power unit of the vehicle operates in accordance with the algorithms that are incorporated in the microprocessor of the controller 5. When the value of the variable temperature T1less than the minimum value of T1 minthe output signals U1temperature sensor 1 and U5and U6microprocessor controller 5 are the minimum value, when the output signal of the rotation mechanism of the stator 6 αwithalso has a minimum value of αwithmin. The stator of the induction motor 7 is in a position (i.e. a rotation angle β), in which the rotation speed of the fan shaft ωinand its flow rate Q is equal to zero. This is because when the agreed position of the stator asynchronically 7 and 8, when β=0 El. degrees, EMF EPin the rotor windings are directed oppositely and total Ep=EP1+Fp2=0. Thus the current in the rotor circuit I2equal to zero and the motors 7 and 8 of the fan drive have the torque (M)is equal to zero, and the rotation speed of the cooling fan 9 ωin=0.

With increasing temperature T1and achievement values above T1 minincreases the output signal of the temperature sensor 1, increase the signal αwithand the angle β. This EMF Ep1>0; in the windings of the rotors of induction motors 7 and 8 is the current I2>0, the electric fan will have the time M>0 and the rotation speed ωin>0, with increased flow rate Q of the fan 9. The process of increasing signals T1U1U5αwith, β, EP1, I2and ωinwill continue until, until thermal equilibrium mode of operation of the cooling system of the power plant. When the angle β from 0 to 90° El. one of the asynchronous motors will operate in the generator (braking) mode, and the second propulsion mode. With further increase of the angle β and the condition of 90° e.<β<180° El. both active components of the current I2>0, i.e. both asynchronous motor operate in motor mode, developing different moments. In the limiting case, when β=180° El. vectors EMF winding rotors are the same and Ep=EP1+Ep2; induction motors develop the same moments, as two ordinary induction motor. At temperature T1=T1maxthe signals U1U5αwith, β and ωinmaximum. In this case the angle β of 180° El., i.e. the stator of an induction motor 7 will occupy the position at which the rotation speed ωinmaxwill be because of the resistance of the resistors 11 to 8-12% less synchronous.

Therefore, to increase the rotation speed ωin(to speed when the resistance of the resistors RD=0, i.e. at the natural mechanical characteristics of engines and supply cooling fan at an angle β=180° El. offer automatic combined microprocessor temperature controller power unit of a vehicle equipped with a controllable saturable reactors (magnetic amplifier) 13, the operating winding 12 which is connected in parallel with the resistors 11 and their control winding 14 is connected to the second output of the microprocessor of the controller 5 through the control unit 15. For large slides s inductive resistance xDworking windings 12 chokes 13 great and all current rotor windings passes through the resistance RDresistors 11. However, milling the definition of the characteristics of the drive cooling fan has appearance shown in figure 4 (lines 4-9). With increasing speed of rotation ωindecreases the current frequency f2rotor windings and inductive resistance xDworking windings 12 choke 13 is reduced; however, a large part of the current I2passes through the working winding 12 of the inductors 13 and the rotation speed ωindrive cooling fan 9 is increased. While the mechanical characteristics of the drive cooling fan have the form shown in figure 4 (lines 1-3). With increasing current passing through the working winding 12 of the inductors 13, the resistance of xDthese windings is reduced. After reaching conditions, when the angle β=180° El. and increases the temperature T1output signal U6microprocessor controller 5 increases (in accordance with the algorithm embedded in the program), which leads to an increase of the current IYin the control windings 14 of the choke 13, to reduce the inductive reactance xDtheir working windings 12, to increase the current I2and to increase the rotation speed ωincooling fan 9 (figure 5). Thus, application of the bias chokes 13 current IYcontrol windings 14 allows virtually shorting resistance of the resistors 11 and to increase the rotation speed ωincooling fan 9 almost to value is, close to the speed of rotation ωinnatural mechanical characteristics of the asynchronous motor (line 1 in figure 5), and to improve the energy performance of the proposed combined automatic microprocessor-based temperature controller power unit of the vehicle.

If the power N power plant will start to increase, this leads to an increase of the output signals U2sensor 2 and U5(or U6at an angle β=180° El.) microprocessor controller 5, which in turn leads to an increase of the rotation frequency ωinand submission Q axial fan 8 and to increase heat transfer in the cooler without changing the temperature T1. This change of the flow Q of the axial fan 8 happens every time you change power N power plant.

The increase in temperature T2external cooling air leads to an increase of the output signals U3sensor 3 temperature of the external cooling air and U5(or U6at an angle β=180° El.) microprocessor controller 5. This in turn leads to an increase of the rotation frequency ωinand submission Q axial fan 8 and to increase heat transfer in the cooler power plant. This change of the flow Q of the axial fan 8 happens every time you change t is mperature T 2external cooling air.

Thus, changes in the power N power plant or temperature T2external cooling air lead to a corresponding change of the rotation frequency ωinand submission Q axial fan 9 while maintaining a controlled temperature T1at a given level (in accordance with the static characteristics 2 or 3, are presented in figure 1), i.e. Q(T1T2N). This combined control of temperature T1using additional control signals according to the power N power plant and the temperature T2external cooling air, which is summed with the signal at the regulated temperature T1in accordance with the algorithm of operation of the temperature controller incorporated in the work program of the microprocessor of the controller 5 provides the exact maintain it at a given level without hesitation. It is known that only the combined system of temperature control have a large inventory of sustainability and high quality work. This significantly increases the efficiency and reliability of the power plant and its cooling system.

Offer automatic combined microprocessor temperature controller power unit vehicles is the second method of reducing resistance in the circuit the rotor windings contains the following main elements (figure 3. The principal block diagram of the proposed automatic combined microprocessor temperature controller power unit of the vehicle with the transistors in the circuit of the rotor windings of asynchronous motors): sensor 1 adjustable temperature T1power plant, sensor 2 power N power plant, sensor 3, the temperature of the external cooling air T2and the sensor 4 angle β stator is connected to the four inputs of the microprocessor of the controller 5, one of the two outputs of which are connected mechanism 6 rotate the stator of an induction motor 7, which shaft is connected with the shaft of the second asynchronous motor 8 and the shaft of the cooling fan 9, the stator windings of induction motors connected to the power source 10, and the rotor winding are connected in series through transistors 16 Tg1-Tg6base and the emitter of which is connected to the second output of the microprocessor of the controller 5 through the control unit 15.

Offer automatic combined microprocessor temperature controller power unit of the vehicle operates in accordance with the algorithms that are incorporated in the microprocessor of the controller 5. When the value of the variable temperature T1less min is a high value of T 1minthe output signals U1temperature sensor 1 and U5and U6microprocessor controller 5 are the minimum value, when the output signal of the rotation mechanism of the stator 6 αwithalso has a minimum value of αwithmin. The stator of the induction motor 7 is in a position (i.e. a rotation angle β), in which the rotation speed of the fan shaft ωinand its flow rate Q is equal to zero. This is because when the agreed position of the stator of induction motors 7 and 8, when β=0 El. degrees, EMF EPin the rotor windings are directed oppositely and total Ep=EP1+FP2=0. Thus the current in the rotor circuit I2equal to zero and the motors 7 and 8 of the fan drive have the torque (M)is equal to zero, and the rotation speed of the cooling fan 9 ωin=0.

With increasing temperature T1and achievement values above T1minincreases the output signal of the temperature sensor 1, increase the signal

αwithand the angle β. This EMF Ep1>0; in the windings of the rotors of induction motors 7 and 8 is the current I2>0, the electric fan will have the time M>0 and the rotation speed ωin>0, with increased flow rate Q of the fan 9. The process of increasing signals T1U1U5αwith, β, EP1I 2and ωinwill continue until, until thermal equilibrium mode of operation of the cooling system of the power plant. When the angle β from 0 to 90° El. one of the asynchronous motors will operate in the generator (braking) mode, and the second propulsion mode. With further increase of the angle β and the condition of 90° e.<β<180° El. both active components of the current I2>0, i.e. both asynchronous motor operate in motor mode, developing different moments. In the limiting case, when the angle β=180° El. vectors EMF winding rotors are the same and Ep=EP1+FP2; induction motors develop the same moments, as two ordinary induction motor. At temperature T1=T1maxthe signals U1U5αwith, β and ωinmaximum. In this case the angle β of 180° El., i.e. the stator of an induction motor 7 will occupy the position at which the rotation speed ωinmaxwill be because of the resistance of the transistors Tg1-Tg68-12% less synchronous.

Therefore, to increase the rotation speed ωin(to speed when the resistance of the transistors RDT=0, i.e. at the natural mechanical characteristics of engines and supply cooling fan at an angle β=180° El. offer automatic combo receiver the config microprocessor temperature controller power unit of a vehicle equipped with a controllable transistors Tg 1-Tg6base and the emitter of which is connected to the second output of the microprocessor of the controller 5 through the control unit 11. For large slides s resistance transistors Tg1-Tg6great and current rotor windings is limited. While the mechanical characteristics of the drive cooling fan have the form shown in figure 4 (lines 4-9). With increasing speed of rotation ωindecreases the resistance of the transistors Tg1-Tg6and the current rotor windings increases and the rotation speed ωindrive cooling fan 9 is increased. While the mechanical characteristics of the drive cooling fan have the form shown in figure 4 (lines 1-3). After reaching conditions, when the angle β=180° El. and increases the temperature T1output signal U6microprocessor controller 5 increases (in accordance with the algorithm embedded in the program), which leads to an increase of the current I2and to increase the rotation speed ωincooling fan 9 (figure 5). Thus, the use of transistors Tg1-Tg6allows virtually shorting rotor winding and to increase the rotation speed ωinthe cooling fan 9 is almost up to values close to the speed of rotation ωinnatural mechanical characteristics of the synchronous motor (line 1 in figure 5), and to improve the energy performance of the proposed combined automatic microprocessor-based temperature controller power unit of the vehicle.

If the power N power plant will start to increase, this leads to an increase of the output signals U2sensor 2 and U5(or U6at an angle β=180° El.) microprocessor controller 5, which in turn leads to an increase of the rotation frequency ωinand submission Q axial fan 8 and to increase heat transfer in the cooler without changing the temperature T1. This change of the flow Q of the axial fan 8 happens every time you change power N power plant.

The increase in temperature T2external cooling air leads to an increase of the output signals U3sensor 3 temperature of the external cooling air and U5(or U6at an angle β=180° El.) microprocessor controller 5. This in turn leads to an increase of the rotation frequency ωinand submission Q axial fan 8 and to increase heat transfer in the cooler power plant. This change of the flow Q of the axial fan 8 occurs every time when the temperature T2external cooling air.

Thus, changes in the power N power plants or those which the temperature T 2external cooling air lead to a corresponding change of the rotation frequency ωinand submission Q axial fan 9 while maintaining a controlled temperature T1at a given level (in accordance with the static characteristics 2 or 3, are presented in figure 1), i.e. Q(T1T2N). This combined control of temperature T1using additional control signals according to the power N power plant and the temperature T2external cooling air, which is summed with the signal at the regulated temperature T1in accordance with the algorithm of operation of the temperature controller incorporated in the work program of the microprocessor of the controller 5 provides the exact maintain it at a given level without hesitation. It is known that only the combined system of temperature control have a large inventory of sustainability and high quality work. This significantly increases the efficiency and reliability of the power plant and its cooling system.

Figure captions Figure 1. Static features automatic temperature control:

1 - s P-regulator at T2 min; 2 - s P-regulator at T2 max; 3 and 4 - with a combined temperature controllers;

Figure 2. Principal b is OK-scheme of an automatic combined microprocessor temperature controller power unit of the vehicle with the saturable reactors in the circuit the rotor windings;

Figure 3. The principal block diagram of the proposed automatic combined microprocessor temperature controller power unit of the vehicle with the transistors in the circuit of the rotor windings of induction motors;

Figure 4. The mechanical characteristics of the drive with a rotary stator cooling fan (lines 1-9) and cooling fan (line 10) at different angles β of rotation of the stator (lines 4-9) and at different currents IYin the windings of the control chokes (lines 1-3) when the angle of rotation of the stator β=180°: 4-180; 5-150; 6-120; 7-90; 8-75; 9-40°; 4-9 at IY=0; 1-3 at Iy1>Iy2>Iy3;

Figure 5. Relative current I2/INomin the rotor windings of the motor drive with the rotating stator cooling fan on the relative speed of rotation ωinMr.when the angle of rotation of the stator β from 0 to 180° (line 1) and changing the current IYin the windings of the control chokes from zero (at point a) to the nominal value (point) (line 2).

Sources of information

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

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

3. Bows NM Automatic temperature control engines. - M.: Mashinostroenie, 1995.

4. Bows NM automation of diesel and gas turbine-electric locomotives and diesel trains. - M.: Mashinostroenie, 1988.

5. P.O. box A.S. Automatic temperature control windings of the traction electric machines locomotives. - M.: Routing, 2005.

6. Vinokurov V.A., Popov D.A. Electrical machinery railway transportation. - M.: Transport, 1986.

7. RF patent 2241837. The temperature controller energy vehicle setup/ Nmeav, Assomigliante, Iaaiiinou. - Publ. 10.12.04., BI No. 34.

1. Automatic combined microprocessor temperature controller power unit of the vehicle that contains the power source AC, the governing body with a temperature sensor, two identical asynchronous motor with slip-ring rotor, the stator windings are connected to a power source, the rotor windings are connected in series with resistors and a shaft connected with the shaft of the cooling fan; the stator of one of the asynchronous motors are pivoted and connected to the rotation mechanism connected to the control body temperature sensor, characterized in that it applied: sensor adjustable temperature power plant, power sensor power plant, temperature sensor, outdoor cooling air and the angle sensor stator, connected to the inputs of a microprocessor-based controller, to one of the outputs of microprocessor controller connected to the rotation mechanism of the stator of an induction motor, and in parallel with the resistors connected to the working winding of the saturable reactors (magnetic amplifier), the managers, the winding of which is connected to the second output of the microprocessor controller through the control unit.

2. Automatic combined microprocessor temperature controller power unit of a vehicle according to claim 1, characterized in that therein the rotor asynchronous motors are connected in series through the emitter-collector transitions of transistors, the bases and the emitters of which are connected to the second output of the microprocessor controller through the control unit transistors.



 

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2 dwg

FIELD: transport engineering.

SUBSTANCE: invention relates to combination cooling systems of vehicles powered by internal combustion engines. Proposed engine cooling system, including two ejectors and two centrifugal fans operating in parallel with ejectors, fan fluid coupling supply main line filled with oil from transmission and steering mechanism, is furnished with two-position fan on-off valve operating from oil pressure in engine lubricating system oil outlet line. If pressure in engine lubricating system exceeds 0.32 MPa, spring-loaded spool of valve cuts off delivery of oil into hydraulic fluid coupling and switches off fan. Invention provides automatic switching on/off of fan which improves reliability of system in winter providing heating of system after starting of engine and further operation under recommended temperature conditions.

EFFECT: improved operation of engine.

2 cl, 2 dwg

FIELD: mechanical engineering; transport engineering.

SUBSTANCE: invention relates to automatic control of liquid temperature in engine cooling system. According to proposed invention, device contains three-way control member with branch pipes to deliver cooling liquid from engine, directing liquid to bypassing and to radiator, temperature transmitter, electric actuator, control unit. Control member has cooling liquid distributing reservoir with rotary valve connected with electric actuator and through holes, with branch pipes to direct cooling liquid to bypassing, radiator and additional branch pipe whose output is connected to heater. Device is furnished also with load transmitter installed on engine and connected with programmable control unit containing setter and comparator whose input is connected to temperature and load transmitters, and output, to electric actuator of control member.

EFFECT: simplified design of control members, reduced time taken for warming up to engine working temperature, possibility of selection of cooling system working temperature and maintaining preset temperature conditions at variable loads of engine.

2 cl, 3 dwg

FIELD: mechanical engineering; internal combustion engines.

SUBSTANCE: invention can be used in vehicle internal combustion engines. Proposed temperature controller containing housing with branch pipes to supply cooling liquid from engine, and direct cooling liquid for bypassing and to radiator, temperature transmitter, sealing element, two valves installed inside housing on rod, temperature transmitter, control unit, reciprocating actuating mechanism, and spring is furnished additionally with load sensor, setter and comparator whose input is connected to temperature transmitter and load sensor, and output is connected to control unit made programmable for changing temperature at variable loads. Moreover, temperature controller contains ultrasonic device whose input is connected with control unit and output, through transmitters and receivers installed on branch pipes directing liquid for bypassing and to radiator, as well as amplifier, are connected to phase-meter. Invention makes it possible to maintain higher temperature of cooling liquid at partial loads, warming up, especially at low ambient temperatures, and purposeful maintenance of low temperature at rated loads of engine and timely elimination of faults in valve system.

EFFECT: enhanced operation.

2 cl, 1 dwg

FIELD: mechanical engineering.

SUBSTANCE: proposed temperature control system contains cooling system with air-liquid radiator and pump connected by pipelines with fitted-in temperature transmitter; fan; induction motors whose stator windings are connected to ac generator driven by heat machine. Shaft of fan is connected with shafts of two similar induction motors with phase-wound rotors whose series-connected rotor windings are connected to rectifier. Stator of one of induction motors is made turnable, being connected with temperature transmitter by means of first control unit and microprocessor controller to which second control unit of heat machine is connected. Semiconductor thermoelectric cooler is connected to cooling system pipeline at outlet from heat machine, cooler being connected with output of rectifier. System is furnished with device for closing rotor windings of induction motors connected to microprocessor controller.

EFFECT: improved stability of control, reduced energy consumption for cooling of heat machine.

2 dwg

Electric thermostat // 2270923

FIELD: automotive industry; vehicle internal combustion engines.

SUBSTANCE: proposed thermostat contains solid filler, electric heater, housing with branch pipes to supply cooling liquid from engine and let it out to bypass into engine and radiator, two valves installed inside housing of rod, temperature and load sensors, comparator, control unit. Thermostat is installed in housing with possibility of heat exchange between solid filler and cooling liquid of cooling system and electric heater installed out of the cooling liquid whose input is connected to control unit, and output is connected with valves through filler, elongated rod and guide bushing. Thermostat can contain also built-in thermoelectric element installed out of cooling liquid whose input is connected to control unit, output is coupled with valves through filler, elongated rod and guide bushing, and junctions of thermoelectric element are connected through heat exchanger to cooling liquid end of cooling system. Moreover, electric thermostat inside housing can contain mechanical thermostat coupled with electric thermostat for parallel operation and switching off of electric thermostat at nominal loads.

EFFECT: possibility of maintaining optimum temperature conditions at partial loads within nonuniformity zone.

3 cl, 3 dwg

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