CN102313416A - Control system of heating device for vehicular refrigerating equipment and method thereof - Google Patents
Control system of heating device for vehicular refrigerating equipment and method thereof Download PDFInfo
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- CN102313416A CN102313416A CN201110299314A CN201110299314A CN102313416A CN 102313416 A CN102313416 A CN 102313416A CN 201110299314 A CN201110299314 A CN 201110299314A CN 201110299314 A CN201110299314 A CN 201110299314A CN 102313416 A CN102313416 A CN 102313416A
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Abstract
The invention relates to a control system of a heating device for vehicular refrigerating equipment, which comprises the heating device, a refrigeration control switch, a processor, a storage unit and a heat exchanger inlet temperature sensor, wherein the refrigeration control switch controls the vehicular refrigerating equipment to work circularly; the storage unit stores a heat exchanger inlet water temperature reference value; the heat exchanger inlet temperature sensor detects a heat exchanger inlet water temperature value at a cooling water inlet of a heat exchanger; the heating device comprises a bypass branch connected onto a cooling water circulating pipeline of an engine in a bypass way; the bypass branch is provided with the heat exchanger; and the processor controls the refrigeration control switch to be connected when the heat exchanger inlet water temperature value is more than the heat exchanger inlet water temperature reference value, so that a vehicular refrigeration circulating system works, and the processor controls the refrigeration control switch to be disconnected when the heat exchanger inlet water temperature value is less than or equal to the heat exchanger inlet water temperature reference value, so that the vehicular refrigeration circulating system stops working. Therefore, the condition that the refrigerating equipment cannot circulate idly when the heating is not sufficient is effectively avoided, and the service life of the whole refrigerating equipment is prolonged.
Description
[technical field]
The present invention relates to a kind of vehicle-mounted refrigeration plant, more particularly, relate to a kind of control system and method thereof of vehicle-mounted refrigeration plant heating plant.
[background technology]
In the prior art, utilize the technology of thermal refrigerating that two kinds of implementations are arranged usually: absorption and absorption type.For vehicle-mounted refrigeration plant, be installed in the confined space of car body absorption the dispersion more easily, thereby be more suitable for vehicle-mounted.
Absorption refrigeration equipment generally includes generator, condenser, evaporimeter and absorber; Generator utilizes the thermal source heated solution to form refrigerant vapour and concentrated solution; Wherein refrigerant vapour forms water as refrigerant after getting into condenser condenses; Spray into evaporation in the evaporimeter again, with the surrounding air cooling, the water as refrigerant after the evaporation gets into absorber again; In addition, the concentrated solution in the generator by concentrated solution be pumped in the absorber with evaporation after the water as refrigerant blended absorbent after form weak solution, carry out circularly cooling next time by weak solution pumped back generator again.
The engine cool water circulation system comprises circulation and engine cooling water outer circulation in the engine cooling water; Circulation and engine cooling water outer circulation are communicated with in the engine cooling water; The engine cooling water outer circulation is provided with radiator, and the heat of cooling water is delivered in the outer air of car body.In absorption vehicle-mounted refrigeration plant, can generator be heated through waste heat that heating plant utilizes engine cooling water and tail gas being set as thermal source.But energy contained in the waste heat that engine cooling water and tail gas provide can constantly change because of the rotating speed of engine, can not stably be input in the generator, causes the refrigeration problem of unstable easily.In addition, when engine just started, the shortage of heat of thermal source was to support whole cooling cycle system, and solution can't evaporate in the generator, and influence produces refrigeration, causes the cooling cycle system idle loop, has influence on the service life of refrigeration plant.
[summary of the invention]
The technical problem underlying that the present invention will solve is; There is the problem of idle loop in refrigeration plant when having engine start to the heating plant of vehicle-mounted refrigeration plant in the prior art; A kind of control system of vehicle-mounted refrigeration plant heating plant is provided; Just start refrigeration plant after making cooling water water temperature in the heating plant reach requirement,, increase the service life to prevent idle loop.
The present invention solves this technical problem the technical scheme that is adopted: the control system that constructs a kind of vehicle-mounted refrigeration plant heating plant; The refrigeration gauge tap that comprises heating plant, the vehicle-mounted refrigeration plant periodic duty of control, also comprise processor, store heat exchanger entrance water temperature a reference value memory, detect the heat exchanger entrance temperature sensor of the heat exchanger entrance water temperature value at place, said heat exchanger cooling water inlet; Said heating plant comprises that the side is connected on the bypass branch road on the engine cool water circulation pipe, and said bypass branch road is provided with the heat exchanger that solution in cooling water on the bypass branch road and the generator is carried out heat exchange; Said processor compares heat exchanger entrance water temperature value and heat exchanger entrance water temperature a reference value after startup; And control said refrigeration gauge tap during greater than heat exchanger entrance water temperature a reference value in said heat exchanger entrance water temperature value and connect; Make vehicle-mounted cooling cycle system work; Break off and when said heat exchanger entrance water temperature value is less than or equal to heat exchanger entrance water temperature a reference value, control said refrigeration gauge tap; Make vehicle-mounted cooling cycle system quit work, and the heat exchanger entrance water temperature value that continues to read the input of heat exchanger entrance temperature sensor relatively heat exchanger entrance water temperature value and heat exchanger entrance water temperature a reference value again.
In the control system of vehicle-mounted refrigeration plant heating plant according to the invention, also comprise inspection vehicle internal milieu temperature value environment temperature sensor, the setting module of target temperature value is set; Said processor is more said ambient temperature value of elder generation and target temperature value after startup; And carry out the comparison of heat exchanger entrance water temperature value and heat exchanger entrance water temperature a reference value again during greater than target temperature value in said ambient temperature value, control the break-make of said refrigeration gauge tap according to comparative result; And when said ambient temperature value is less than or equal to target temperature value, continue to read the ambient temperature value of said environment temperature sensor input.
In the control system of vehicle-mounted refrigeration plant heating plant according to the invention; Said engine cool water circulation pipe is provided with and detects the outer outlet temperature sensor that follows that follows the outlet water temperature value in the said engine cool water circulation pipe outside the coolant outlet place, and said store memory contains the outer outlet water temperature a reference value of following; Said bypass branch road also comprises first three-way magnetic valve, second three-way magnetic valve, circulating pump, and said first three-way magnetic valve and second three-way magnetic valve are controlled said bypass branch road and the engine cool water circulation pipe is switched on or switched off; Said circulating pump is that the cooling water on the bypass branch road provides power; Said processor after startup earlier more said outer follow the outlet water temperature value and outside follow and export the water temperature a reference value; And outside said, follow the outlet water temperature value greater than outside when following outlet water temperature a reference value; Controlling said first three-way magnetic valve and second three-way magnetic valve connects said bypass branch road and engine cool water circulation pipe; Control said circulating pump and start, carry out the comparison of said ambient temperature value and target temperature value again, carry out down-stream according to comparative result; Be less than or equal to outer following when exporting the water temperature a reference value and outside said, follow the outlet water temperature value; Controlling said first three-way magnetic valve and second three-way magnetic valve breaks off said bypass branch road and engine cool water circulation pipe; Control said circulating pump and stop, continuing to read the said outer outer outlet water temperature value of following of following the outlet temperature sensor input.
In the control system of vehicle-mounted refrigeration plant heating plant according to the invention, said store memory contains heat exchanger exit water temperature a reference value; Said heat exchanger coolant outlet place is provided with the said heating plant of heat exchanger outlet temperature sensor that detects the heat exchanger exit water temperature value and also comprises through high-temperature gas changing-over valve and be connected the tail gas branch road on the engines tail tracheae; Said high-temperature gas changing-over valve can be regulated the exhaust flow that imports said tail gas branch road, and said tail gas branch road comprises the heater that the cooling water in tail gas on the tail gas branch road and the said heat exchanger is carried out heat exchange; When said processor is less than or equal to heat exchanger entrance water temperature a reference value in said heat exchanger entrance water temperature value; Control said high-temperature gas changing-over valve and increase the exhaust flow that imports the tail gas branch road; Controlling said refrigeration gauge tap breaks off; More said then heat exchanger exit water temperature value and heat exchanger exit water temperature a reference value; In said heat exchanger exit water temperature value during greater than heat exchanger exit water temperature a reference value; Control the exhaust flow that said high-temperature gas changing-over valve reduces to import the tail gas branch road, and the heat exchanger entrance water temperature value that continues to read the input of heat exchanger entrance temperature sensor relatively heat exchanger entrance water temperature value and heat exchanger entrance water temperature a reference value again, carry out down-stream according to comparative result; And when said heat exchanger exit water temperature value is less than or equal to heat exchanger exit water temperature a reference value; The heat exchanger entrance water temperature value that continues to read the input of heat exchanger entrance temperature sensor is relatively heat exchanger entrance water temperature value and heat exchanger entrance water temperature a reference value again, carries out down-stream according to comparative result.
In the control system of vehicle-mounted refrigeration plant heating plant according to the invention, said store memory contains the outlet air temperature a reference value, and said heater tail gas exit is provided with the tail gas outlet temperature sensor that detects the outlet air temperature value; Also comprise and send the ash disposal warning device that heater needs the information of ash disposal; When said processor is less than or equal to heat exchanger exit water temperature a reference value in said heat exchanger exit water temperature value; Control said high-temperature gas changing-over valve and increase the exhaust flow that imports the tail gas branch road; More said again outlet air temperature value and outlet air temperature a reference value; In said outlet air temperature value during greater than the outlet air temperature a reference value; Trigger said ash disposal warning device and send information, and the heat exchanger entrance water temperature value that continues to read the input of heat exchanger entrance temperature sensor relatively heat exchanger entrance water temperature value and heat exchanger entrance water temperature a reference value again, carry out down-stream according to comparative result; When said outlet air temperature value is less than or equal to the outlet air temperature a reference value; The heat exchanger entrance water temperature value that continues to read the input of heat exchanger entrance temperature sensor is relatively heat exchanger entrance water temperature value and heat exchanger entrance water temperature a reference value again, carries out down-stream according to comparative result.
Another technical problem that the present invention will solve is; There is the problem of idle loop in refrigeration plant when having engine start to the heating plant of vehicle-mounted refrigeration plant in the prior art; A kind of control method of vehicle-mounted refrigeration plant heating plant is provided; Just start refrigeration plant after making cooling water water temperature in the heating plant reach requirement,, increase the service life to prevent idle loop.
The present invention solves this technical problem the technical scheme that is adopted: construct a kind of control method of vehicle-mounted refrigeration plant heating plant, may further comprise the steps:
S0, the refrigeration gauge tap of vehicle-mounted cooling cycle system work is set on vehicle-mounted refrigeration plant, the refrigeration gauge tap is set controls break-make by processor; Heating plant is set comprises and other be connected on the bypass branch road on the engine cool water circulation pipe, on said bypass branch road, be provided with cooling water on the bypass branch road and generator in the solution heat exchanger that carries out heat exchange; The place is provided with the heat exchanger entrance temperature sensor that detects the heat exchanger entrance water temperature value in said heat exchanger cooling water inlet; Preset heat exchanger entrance water temperature a reference value also is stored in it in memory;
S10, startup make processor, memory, heat exchanger entrance temperature sensor start working;
S40, heat exchanger entrance temperature sensor detect the heat exchanger entrance water temperature value at place, heat exchanger cooling water inlet, and processor reads the heat exchanger entrance water temperature a reference value in the memory;
S50, the more said heat exchanger entrance water temperature value of processor and heat exchanger entrance water temperature a reference value when the heat exchanger entrance water temperature value gets into step S60 during greater than heat exchanger entrance water temperature a reference value, otherwise get into step S70;
S60, processor are controlled said refrigeration gauge tap and are connected, and make vehicle-mounted refrigeration plant begin kind of refrigeration cycle work, return step S40;
S70, processor are controlled said refrigeration gauge tap and are broken off, and make vehicle-mounted refrigeration plant quit work, and return step S40.
In the control method of vehicle-mounted refrigeration plant heating plant according to the invention, comprise also among the said step S0 that environment temperature sensor is set comes inspection vehicle internal milieu temperature value; Setting module is set comes the target setting temperature value; Further comprising the steps of after the said step S10:
S31, environment temperature sensor inspection vehicle internal milieu temperature value, processor read the heat exchanger entrance water temperature a reference value in the memory;
S33, the more said ambient temperature value of processor and target temperature value when said ambient temperature value during greater than target temperature value, get into step S40; Otherwise get into step S31.
In the control method of vehicle-mounted refrigeration plant heating plant according to the invention, also be included among the said step S0 to be provided with on the engine cool water circulation pipe and detect the outer outlet temperature sensor that follows that follows the outlet water temperature value in the said engine cool water circulation pipe outside the coolant outlet place; Preset outer follow outlet water temperature a reference value and it is stored in the memory; Further comprising the steps of after the said step S10:
S21, follow outlet temperature sensor outward and detect the outer outlet water temperature value of following, processor reads the outer outlet water temperature a reference value of following;
S23, processor are more said to follow the outlet water temperature value and follows outlet water temperature a reference value outward outward, when said outer follow the outlet water temperature value greater than outside when following outlet water temperature a reference value, entering step S25; Otherwise get into step S27;
S25, said bypass branch road and engine cool water circulation pipe are connected, got into step S31;
S27, said bypass branch road and engine cool water circulation pipe are broken off, get into step S21.
In the control method of vehicle-mounted refrigeration plant heating plant according to the invention, comprise also among the said step S0 that the heat exchanger outlet temperature sensor is set detects said heat exchanger coolant outlet place heat exchanger exit water temperature value; Heating plant is set also to be comprised through high-temperature gas changing-over valve and is connected the tail gas branch road on the engines tail tracheae; High-temperature gas changing-over valve is set regulates the exhaust flow that imports said tail gas branch road, heater is set on the tail gas branch road cooling water in tail gas on the tail gas branch road and the said heat exchanger is carried out heat exchange; Preset heat exchanger exit water temperature a reference value also is stored in it in memory; Said step 70 comprises step by step following:
S71, processor are controlled said refrigeration gauge tap and are broken off, and make vehicle-mounted cooling cycle system quit work; Processor control high-temperature gas changing-over valve increases the exhaust flow that imports the tail gas branch road;
S72, heat exchanger outlet temperature sensor detect the heat exchanger exit water temperature value, and processor reads heat exchanger exit water temperature a reference value;
S73, processor be heat exchanger exit water temperature value and heat exchanger exit water temperature a reference value relatively, gets into step S74 during greater than heat exchanger exit water temperature a reference value in the heat exchanger exit water temperature value; Otherwise get into step S40;
S74, processor are controlled the exhaust flow that said high-temperature gas changing-over valve reduces to import the tail gas branch road, return step S40.
In the control method of vehicle-mounted refrigeration plant heating plant according to the invention, also be included in heater tail gas exit among the said step S0 tail gas outlet temperature sensor that detects the outlet air temperature value is set; Setting can be sent the ash disposal warning device that heater needs the information of ash disposal; Preset outlet air temperature a reference value also is stored in it in memory; Said step 73 comprises step by step following:
S75, processor be heat exchanger exit water temperature value and heat exchanger exit water temperature a reference value relatively, gets into step S74 during greater than heat exchanger exit water temperature a reference value in the heat exchanger exit water temperature value; Otherwise get into step S76;
S76, tail gas outlet temperature sensor detect the outlet air temperature value, and processor reads the outlet air temperature a reference value;
S77, processor be outlet air temperature value and outlet air temperature a reference value relatively, during greater than the outlet air temperature a reference value, gets into step S78 in said outlet air temperature value; Otherwise get into step S40;
S78, processor trigger said ash disposal warning device and send information, return step S40.
The control system and method for the said vehicle-mounted refrigeration plant heating plant of embodiment of the present invention; Has following beneficial effect: through the heat exchanger entrance water temperature value that the heat exchanger entrance temperature sensor detects place, heat exchanger cooling water inlet is set; And relatively with itself and heat exchanger entrance water temperature a reference value; When heat exchanger entrance water temperature value during, explain that the temperature of engine cooling water is enough to support vehicle-mounted refrigeration plant to carry out kind of refrigeration cycle work greater than heat exchanger entrance water temperature a reference value; At this moment, processor control refrigeration gauge tap is connected, and vehicle-mounted refrigeration plant begins kind of refrigeration cycle.When the heat exchanger entrance water temperature value is less than or equal to heat exchanger entrance water temperature a reference value; The temperature that engine cooling water is described is not enough to support vehicle-mounted refrigeration plant and carries out kind of refrigeration cycle; Processor control this moment refrigeration gauge tap breaks off, and vehicle-mounted refrigeration plant quits work; Thereby effectively avoided the refrigeration plant can idle loop when heat supply is not enough, prolonged the service life of whole refrigeration plant.The engine cooling water generally temperature when starting is lower, treats engine operation after a period of time, and the temperature of cooling water can progressively raise, and is enough to the refrigeration plant heat supply.Therefore; When the heat exchanger entrance water temperature value is less than or equal to heat exchanger entrance water temperature a reference value; Continue to detect the heat exchanger entrance water temperature value, and relatively heat exchanger entrance water temperature value and heat exchanger entrance water temperature a reference value, up to the heat exchanger entrance water temperature value during greater than heat exchanger entrance water temperature a reference value through the heat exchanger entrance temperature sensor; Automatically start vehicle-mounted refrigeration plant, need not people's hand operated.
To combine accompanying drawing and embodiment that the present invention is described further below.
[description of drawings]
Fig. 1 is the structural representation of the control system of vehicle-mounted refrigeration plant heating plant according to the invention;
Fig. 2 is the system block diagram of the control system of vehicle-mounted refrigeration plant heating plant according to the invention;
Fig. 3 is the flow chart of the control method of vehicle-mounted refrigeration plant heating plant according to the invention;
Fig. 3 a is the detail flowchart of step S70 among Fig. 3;
Fig. 3 b is the detail flowchart of step S73 among Fig. 3 a.
[specific embodiment]
Like Fig. 1,2, shown in 3; Vehicle-mounted refrigeration plant comprises the generator 11 and refrigeration gauge tap 12 (as shown in Figure 2) that is arranged on the vehicle-mounted refrigerating device refrigeration closed circuit 10; Heating plant comprises the other bypass branch road 21 on the engine cool water circulation pipe that is connected on, and bypass branch road 21 is provided with the heat exchanger 23 that solution in cooling water on the bypass branch road 21 and the generator 11 is carried out heat exchange.In the preferred embodiment of the control system of vehicle-mounted refrigeration plant heating plant according to the invention; Comprise and supply processor 120, memory 130 and heat exchanger entrance temperature sensor S2; Wherein processor 120 reaches the vehicle-mounted refrigeration plant of control and whether opens kind of refrigeration cycle through the break-make of control refrigeration gauge tap 12; Heat exchanger entrance temperature sensor S2 is used to detect the water temperature value of the engine cooling water porch of heat exchanger 23, i.e. heat exchanger entrance water temperature value t2; Store heat exchanger entrance water temperature a reference value T2 in the memory 130.After the control system starts; Processor 120 compares heat exchanger entrance water temperature value t2 and heat exchanger entrance water temperature a reference value T2 earlier; And said heat exchanger entrance water temperature value t2 greater than heat exchanger entrance water temperature a reference value T2 time control refrigeration gauge tap 12 connect; Make vehicle-mounted refrigeration plant start kind of refrigeration cycle, begin cooling gas in car body.Processor is controlled said refrigeration gauge tap 12 disconnections when said heat exchanger entrance water temperature value t2 is less than or equal to heat exchanger entrance water temperature a reference value T2, makes vehicle-mounted refrigeration plant stop kind of refrigeration cycle, stops cooling gas in car body.Particularly, processor 120 can carry out drive controlling to refrigeration gauge tap 12 through drive circuit, to control its break-make.
The engine cooling water generally temperature when starting is lower, treats engine operation after a period of time, and the temperature of cooling water can progressively raise, and is enough to vehicle-mounted refrigeration plant heat supply.Therefore; When heat exchanger entrance water temperature value t2 is less than or equal to heat exchanger entrance water temperature a reference value T2; Continue to detect heat exchanger entrance water temperature value t2, and relatively heat exchanger entrance water temperature value t2 and heat exchanger entrance water temperature a reference value T2, up to heat exchanger entrance water temperature value t2 during greater than heat exchanger entrance water temperature a reference value T2 through heat exchanger entrance temperature sensor S2; The control system can start vehicle-mounted refrigeration plant automatically and get into kind of refrigeration cycle, need not personal monitoring and operation.
In the preferred embodiment of the control system of vehicle-mounted refrigeration plant heating plant according to the invention, preferably also comprise the environment temperature sensor S14 that is arranged in the car body, be used for detecting the ambient temperature value t14 in the car body; Also comprise and be used for the setting module 110 of target setting temperature value T14.After the control system started, processor 120 is more said ambient temperature value t14 and target temperature value T14 earlier, during greater than target temperature value T14, explained that the interior environment temperature of car body is too high at said ambient temperature value t14, need freeze; Carry out the comparison of heat exchanger entrance water temperature value t2 and heat exchanger entrance water temperature a reference value T2 this moment again; Control the break-make of said refrigeration gauge tap 12 according to comparative result; When the waste heat of engine cooling water is enough to support whole vehicle-mounted refrigeration plant and carries out kind of refrigeration cycle, start vehicle-mounted refrigeration plant and freeze.When said ambient temperature value t14 is less than or equal to target temperature value T14; Explain that the environment temperature in the car body is lower; Do not need to freeze again, so processor 120 continues to read the ambient temperature value t14 of said environment temperature sensor S14 input, environment temperature is monitored; Automatically open vehicle-mounted refrigeration plant and carry out kind of refrigeration cycle in the environment temperature back that raises, remain near the target temperature value T14 to keep in the car body environment temperature.
For ease target temperature value T14 is set; Setting module 110 preferably is set comprises keyboard circuit 111 and keyboard 112; When needing target setting temperature value T14; Through keyboard 112 input target temperature value T14, through keyboard circuit 111 target temperature value T14 is input in the processor 120 again; Also can target temperature value T14 be stored in the memory 130, read for processor 120 through keyboard circuit 111.
In this preferred embodiment; The outer outlet temperature sensor S1 that follows that follows outlet water temperature value t1 in the detection of engine cooling water circulation line outside the coolant outlet place preferably is set on the engine cool water circulation pipe, stores the outer outlet water temperature a reference value T1 that follows in the memory 130.Bypass branch road 21 comprises that also the first three-way magnetic valve 22a, the second three-way magnetic valve 22b, circulating pump 24, the first three-way magnetic valve 22a and second three-way magnetic valve 22b control bypass branch road 21 are switched on or switched off with the engine cool water circulation pipe; Circulating pump 24 provides power for the cooling water on the bypass branch road 21.When outside follow outlet water temperature value t1 greater than outside when following outlet water temperature a reference value T1; Explain that the cooling water temperature in the engine cooling water circulation circulation line raises; And be enough to support whole vehicle-mounted refrigeration plant and carry out kind of refrigeration cycle; This moment, the processor 120 control first three-way magnetic valve 22a and the second three-way magnetic valve 22b connected bypass branch road 21 and engine cool water circulation pipe; Control said circulating pump 24 and start, engine cooling water is imported in the heat exchanger 23, for vehicle-mounted refrigeration plant provides heat energy; The inlet I1 of first and second three-way magnetic valve is a normal open with outlet I2 particularly, and this moment, processor 120 was controlled the inlet I1 and outlet I3 conducting of first and second three-way magnetic valve through drive circuit, can bypass branch road 21 be inserted on the engine cool water circulation pipe.Follow outlet water temperature value t1 outside said and be less than or equal to outer following when exporting water temperature a reference value T1, explain that engine just starts, the cooling water temperature in the engine cool water circulation pipe is lower; Also be not elevated to sufficiently high temperature; Therefore the processor 120 control first three-way magnetic valve 22a and the second three-way magnetic valve 22b break off bypass branch road 21 and engine cool water circulation pipe, and control circulating pump 24 stops, and continue to read the outer outer outlet water temperature value t1 that follows that follows outlet temperature sensor S1 input; Temperature with the monitoring engine cooling water; And follow outlet water temperature value t1 outside and reach outer when following outlet water temperature a reference value T1, automatically bypass branch road 21 being inserted the engine cool water circulation pipes again, control circulating pump 24 starts; Engine cooling water is imported in the heat exchanger 23, for vehicle-mounted refrigeration plant provides heat energy; The inlet I1 of first and second three-way magnetic valve is a normal open with outlet I2 particularly; This moment, processor 120 broke off with outlet I3 through the inlet I1 of first and second three-way magnetic valve of drive circuit control, can bypass branch road 21 be broken off from the engine cool water circulation pipe.
The engine cool water circulation pipe generally includes cooling water inner loop pipeline 13 and cooling water external circulation line 14; Engine interior is provided with mechanical type temperature-sensing valve 1, and 1 connection of mechanical type temperature-sensing valve is arranged between cooling water inner loop pipeline 13 and the cooling water external circulation line 14.Behind the engine start, the engine interior cooling water recirculation system is started working simultaneously, and along with engine operating duration increases, its inner loop cooling system is not enough to take away the heat that engine produces, thereby the temperature of cooling water is raise.The mechanical type temperature-sensing valve that is positioned at engine interior this moment is opened; High-temperature cooling water enters into cooling water external circulation line 14 from cooling water inner loop pipeline 13; And dispel the heat through the heat abstractor 2 that is provided with on the cooling water external circulation line 14; Thereby reduce the temperature of cooling water, the cooling water after the cooling returns in the engine inner loop pipeline engine is cooled off.
In the control system of vehicle-mounted refrigeration plant heating plant according to the invention, can also utilize tail gas that engine cooling water is heated, to increase the energy of thermal source.Heating plant preferably is set also to be comprised through high-temperature gas changing-over valve 26 and is connected the tail gas branch road 25 on the engines tail tracheae 15; High-temperature gas changing-over valve 26 can be regulated the exhaust flow that imports tail gas branch road 25, and tail gas branch road 25 comprises the heater 27 that the cooling water in tail gas on the tail gas branch road 25 and the heat exchanger 23 is carried out heat exchange.Particularly, high-temperature gas changing-over valve 26 comprises inlet II1 and two an outlet II2, II3, and inlet II1 is connected with engines tail tracheae 15, and one exports II2 and is connected with tail gas branch road 25, and another exports the direct conducting of II3 to ambient atmosphere; Behind the engine start, a tail gas part that is produced is imported into tail gas branch road 25, and another part directly drains in the atmosphere.Processor 120 is through high-temperature gas changing-over valve drive circuit 101 control high-temperature gas changing-over valves 26, and then adjusting imports the exhaust flow of tail gas branch road 25.The tail gas of tail gas branch road 25 carries out heat exchange through heater 27 and heat exchanger 23 interior cooling waters, can further improve the temperature of cooling water, increases the driving heat source of generator 11, can increase the refrigeration work consumption of vehicle-mounted refrigeration plant.
But the flow of the discharging of motor exhaust is uneven, and its temperature is very unstable, if as thermal source then can cause the instability of refrigeration plant.In this preferred embodiment, preferably be provided with the heat exchanger outlet temperature sensor S3 that detects heat exchanger exit water temperature value t3, and in memory 130, store heat exchanger exit water temperature a reference value T3 at heat exchanger 23 coolant outlet places.When heat exchanger entrance water temperature value t2 is less than or equal to heat exchanger entrance water temperature a reference value T2; Explain that the shortage of heat of depending engine cooling water alone is to drive whole vehicle-mounted refrigeration plant; This moment, processor 120 control high-temperature gas changing-over valves 26 increased the exhaust flow that imports tail gas branch road 25; Improve the temperature of engine cooling water, control refrigeration gauge tap 12 break-makes; The comparative result that compares heat exchanger exit water temperature value t3 and heat exchanger exit water temperature a reference value T3 again; At heat exchanger exit water temperature value t3 during greater than heat exchanger exit water temperature a reference value T3; Explain that the heat of depending engine cooling water alone is enough to drive whole vehicle-mounted refrigeration plant, the said high-temperature gas changing-over valve 26 of processor 120 controls this moment reduces to import the exhaust flow of tail gas branch road 25; If this moment, heat exchanger exit water temperature value t3 was less than or equal to heat exchanger exit water temperature a reference value T3; Explain that heat exchanger 23 is still less to the heat that generator 11 provides; This moment, the cooling water water temperature of heat exchangers 23 porch was monitored in processor 120 continuation; And, increase the exhaust flow that imports tail gas branch roads 25 as continuing control control high-temperature gas changing-over valve 26 according to its water temperature and a reference value continued down-stream relatively.
In the control system of vehicle-mounted refrigeration plant according to the invention,, need periodic cleaning in order to prevent the heater 27 stifled ashes on the tail gas branch road 25.Because the working time of 27 each period of heater is different in size, so its situation that stifled ash takes place is also different, and periodic cleaning can not be got rid of the generation of stifled grey situation fully and increase maintenance cost.In this preferred embodiment, the tail gas outlet temperature sensor S6 that detects outlet air temperature value t6 is set in heater 27 tail gas exits preferably; And in memory 130, store outlet air temperature a reference value T6, and ash disposal warning device 28 is set.And processor 120 is set when heat exchanger exit water temperature value t3 is less than or equal to heat exchanger exit water temperature a reference value T3; Control said high-temperature gas changing-over valve 26 and increase the exhaust flow that imports tail gas branch road 25, more said again outlet air temperature value t6 and outlet air temperature a reference value T6; If this moment, outlet air temperature value t6 was greater than outlet air temperature a reference value T6; Even explain that increasing exhaust flow can not improve heat exchanger 23 outlet water temperatures; Explain stifled ash taken place in the heater 27 that this moment, processor 120 triggering ash disposal warning devices 28 sent the information that heater 27 needs ash disposal; If when this moment, outlet air temperature value t6 was less than or equal to outlet air temperature a reference value T6, the also no show limit of exhaust flow is described, is needed the regular hour could improve heat exchanger 23 delivery port water temperatures; This moment, processor 120 continued to read heat exchanger entrance water temperature value t2, compared heat exchanger entrance water temperature value t2 and heat exchanger entrance water temperature a reference value T2 again, carried out down-stream according to comparative result.
In this preferred embodiment, ash disposal warning device 28 can send the information that heater 27 needs ash disposal through variety of way, like the sound of reporting to the police, the light of looking screen or reporting to the police of warning.In this preferred embodiment, ash disposal warning device 28 preferably is set comprises display screen 103 and display driver circuit 102, when needs sent information, processor 120 triggered display driver circuit 102 through display screen 103 display reminding information.Whether situation Laian County eliminating ash of stifled ash so just can take place according to reality, has saved maintenance cost.
In the above-described embodiments, all temps a reference value can be regulated according to actual needs, particularly, can be provided with through setting module 110, is provided with to be stored in after the completion to supply processors 120 to read in the memory 130 again.Like this, when carrying out system debug, can constantly change the parameter of a reference value, to obtain the best parameter value as whole system.
Shown in Fig. 3,3a, 3b, in the preferred embodiment of the control method of vehicle-mounted refrigeration plant heating plant according to the invention, comprise the steps:
At first initialization is provided with corresponding sensor AT STATION in the refrigeration plant, and in memory 130, presets all temps a reference value, shown in step S0 among the figure; Can adjust setting to the said temperature a reference value as required.Start-up control system then makes processor 120, memory 130 and each temperature sensor operate as normal, shown in step S10 among the figure.At this moment, follow outer the following of outlet temperature sensor S1 detection outward and export water temperature value t1, and it is passed to processor 120, follow outlet water temperature a reference value T1 outside processor 120 reads in memory 130, shown in step S21 among the figure.Processor 120 is relatively outer to follow outlet water temperature value t1 and follows outlet water temperature a reference value T1 outward; When outside follow outlet water temperature value t1 and be less than or equal to outer following when exporting water temperature a reference value T1, explain that engine just starts, cooling water temperature is also lower; Can not be used for to generator 11 heat supplies; Thereby, continue the outer outlet water temperature value t1 that follows of monitoring again, shown in step S23 in scheming with bypass branch road 21 and the disconnection of engine cool water circulation pipe; Up to outside follow outlet water temperature value t1 greater than outside follow outlet water temperature a reference value T1; Then bypass branch road 21 and engine cool water circulation pipe are connected; Make engine cooling water get into bypass branch road 21, continue following procedure again, shown in step S25 among the figure for generator 11 heat supplies.
At this moment, environment temperature sensor S14 testing environment temperature value t14, and it is passed to processor 120, processor 120 reads target temperature value T14 in memory 130, shown in step S31 among the figure; Wherein target temperature value T14 can set through setting module 110.Processor 120 is ambient temperature value t14 and target temperature value T14 relatively; If ambient temperature value t14 is less than or equal to target temperature value T14; Explain that environment temperature is lower in car body this moment; Need not open refrigeration plant and freeze, then environment temperature sensor S14 continues monitoring of environmental temperature value t14, shown in step S33 among the figure.Greater than target temperature value T14, explain that environment temperature is higher in car body this moment up to ambient temperature value t14, need to open refrigeration plant and freeze, continue following procedure this moment.
Before opening vehicle-mounted refrigeration plant and carrying out kind of refrigeration cycle, need look at also whether heat that cooling water provides is enough to support whole vehicle-mounted refrigeration plant and carries out kind of refrigeration cycle, to prevent the refrigeration plant idle loop.At this moment, heat exchanger entrance temperature sensor S2 detects the heat exchanger entrance water temperature value t2 at place, heat exchanger 23 cooling water inlets, and processor 120 reads the heat exchanger entrance water temperature a reference value T2 in the memory 130, shown in step S40 among the figure.Processor 120 more said heat exchanger entrance water temperature value t2 and heat exchanger entrance water temperature a reference value T2 then; As heat exchanger entrance water temperature value t2 during greater than heat exchanger entrance water temperature a reference value T2; Explain that heat that engine cooling water provides is enough to support vehicle-mounted refrigeration plant and carries out kind of refrigeration cycle; Then get into step S60, otherwise get into step S70, shown in step S50 among the figure.When heat that engine cooling water provided is enough to support vehicle-mounted refrigeration plant and carries out kind of refrigeration cycle; Processor 120 control refrigeration gauge taps 12 are connected; Make vehicle-mounted refrigeration plant begin kind of refrigeration cycle work; Return step S40 again, continue the water temperature value of monitoring engine cooling water porch, shown in step S60 among the figure.When the shortage of heat that engine cooling water provided is carried out kind of refrigeration cycle to support vehicle-mounted refrigeration plant; The said refrigeration gauge tap 12 of processor 120 controls breaks off; Make vehicle-mounted refrigeration plant quit work; Return step S40, continue the water temperature value of monitoring engine cooling water porch, shown in step S70 among the figure.
Shown in Fig. 3 a, also comprise step by step following among the above-mentioned steps S70: when the shortage of heat that engine cooling water provided was carried out kind of refrigeration cycle to support vehicle-mounted refrigeration plant, the said refrigeration gauge tap 12 of processor 120 controls broke off; And processor 120 control high-temperature gas changing-over valves 26 increase the exhaust flow that imports tail gas branch road 25, shown in step S71 among the figure.At this moment,, can increase the heat of engine cooling water, carry out kind of refrigeration cycle so that it is enough to support vehicle-mounted refrigeration plant through increasing the exhaust flow that imports tail gas branch road 25.At this moment, heat exchanger outlet temperature sensor S3 detects heat exchanger exit water temperature value t3, and processor 120 reads heat exchanger exit water temperature a reference value T3, shown in step S72 among the figure.Processor 120 compares heat exchanger exit water temperature value t3 and heat exchanger exit water temperature a reference value T3 then; At heat exchanger exit water temperature value t3 during greater than heat exchanger exit water temperature a reference value T3; It is enough to the heat of cooling water to explain that tail gas replenishes; Make the heat of cooling water be enough to support vehicle-mounted refrigeration plant and carry out kind of refrigeration cycle, get into step S74 this moment; Otherwise get into step S40, continue monitoring heat exchanger outlet water temperature value t3, and according to circumstances determine whether to need to continue to increase the exhaust flow that imports tail gas branch road 25, shown in step 73 among the figure.As heat exchanger exit water temperature value t3 during greater than heat exchanger exit water temperature a reference value T3; Explain that the exhaust flow that imports is bigger, the said high-temperature gas changing-over valve 26 of processor 120 controls reduces to import the exhaust flow of tail gas branch road 25, so that guarantee that cooling water is to generator 11 heat supply stably; Return step S40 again; Continue monitoring heat exchanger outlet water temperature value t3, and according to circumstances determine whether to need to continue to increase the exhaust flow that imports tail gas branch road 25, shown in step S74 among the figure.
Shown in Fig. 3 b; Also comprise step by step following among the above-mentioned steps S73: processor 120 is heat exchanger exit water temperature value t3 and heat exchanger exit water temperature a reference value T3 relatively; Get into step S74 during greater than heat exchanger exit water temperature a reference value T3 at heat exchanger exit water temperature value t3, continue according to original program; Otherwise get into step S76, shown in step S75 among the figure.When heat exchanger exit water temperature value t3 was less than or equal to heat exchanger exit water temperature a reference value T3, tail gas outlet temperature sensor S6 detected outlet air temperature value t6, and processor 120 reads outlet air temperature a reference value T6, shown in step S76 among the figure.Processor 120 compares outlet air temperature value t6 and outlet air temperature a reference value T6 then; As outlet air temperature value t6 during greater than outlet air temperature a reference value T6; The exhaust flow that tail gas branch road 25 is described continue the water temperature value that has never increased heat exchanger 23 outlets, explains stifled ash has taken place, and need remove ash manipulation; This moment, processor 120 triggering ash disposal warning devices 28 sent information, returned step S40 again; Otherwise do not do prompting and directly get into step S40.
The above embodiment has only expressed several kinds of embodiments of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the present invention's design, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (10)
1. the control system of a vehicle-mounted refrigeration plant heating plant; The refrigeration gauge tap that comprises heating plant, the vehicle-mounted refrigeration plant periodic duty of control; It is characterized in that, also comprise processor, store heat exchanger entrance water temperature a reference value (T2) memory, detect the heat exchanger entrance temperature sensor (S2) of the heat exchanger entrance water temperature value (t2) at place, said heat exchanger cooling water inlet; Said heating plant comprises that the side is connected on the bypass branch road on the engine cool water circulation pipe, and said bypass branch road is provided with the heat exchanger that solution in cooling water on the bypass branch road and the generator is carried out heat exchange;
Said processor compares heat exchanger entrance water temperature value (t2) and heat exchanger entrance water temperature a reference value (T2) after startup; And control said refrigeration gauge tap during greater than heat exchanger entrance water temperature a reference value (T2) in said heat exchanger entrance water temperature value (t2) and connect; Make vehicle-mounted cooling cycle system work; Break off and when said heat exchanger entrance water temperature value (t2) is less than or equal to heat exchanger entrance water temperature a reference value (T2), control said refrigeration gauge tap; Make vehicle-mounted cooling cycle system quit work, and the heat exchanger entrance water temperature value (t2) that continues to read heat exchanger entrance temperature sensor (S2) input relatively heat exchanger entrance water temperature value (t2) and heat exchanger entrance water temperature a reference value (T2) again.
2. according to the control system of the said vehicle-mounted refrigeration plant of claim 1, it is characterized in that, also comprise inspection vehicle internal milieu temperature value (t14) environment temperature sensor (S14), the setting module of target temperature value (T14) is set;
Said processor is elder generation's more said ambient temperature value (t14) and target temperature value (T14) after startup; And carry out the comparison of heat exchanger entrance water temperature value (t2) and heat exchanger entrance water temperature a reference value (T2) again during greater than target temperature value (T14) in said ambient temperature value (t14), control the break-make of said refrigeration gauge tap according to comparative result; And when said ambient temperature value (t14) is less than or equal to target temperature value (T14), continue to read the ambient temperature value (t14) of said environment temperature sensor (S 14) input.
3. according to the control system of the said vehicle-mounted refrigeration plant of claim 2; It is characterized in that; Said engine cool water circulation pipe is provided with and detects the outer outlet temperature sensor (S1) that follows that follows outlet water temperature value (t1) in the said engine cool water circulation pipe outside the coolant outlet place, and said store memory contains the outer outlet water temperature a reference value (T1) of following;
Said bypass branch road also comprises first three-way magnetic valve, second three-way magnetic valve, circulating pump, and said first three-way magnetic valve and second three-way magnetic valve are controlled said bypass branch road and the engine cool water circulation pipe is switched on or switched off; Said circulating pump is that the cooling water on the bypass branch road provides power;
Said processor after startup earlier more said outer follow outlet water temperature value (t1) and outside follow and export water temperature a reference value (T1); And outside said, follow outlet water temperature value (t1) greater than outside follow outlet water temperature a reference value when (T1); Controlling said first three-way magnetic valve and second three-way magnetic valve connects said bypass branch road and engine cool water circulation pipe; Control said circulating pump and start, carry out the comparison of said ambient temperature value (t14) and target temperature value (T14) again, carry out down-stream according to comparative result; Be less than or equal to outer following when exporting water temperature a reference value (T1) and outside said, follow outlet water temperature value (t1); Controlling said first three-way magnetic valve and second three-way magnetic valve breaks off said bypass branch road and engine cool water circulation pipe; Control said circulating pump and stop, continuing to read the said outer outer outlet water temperature value (t1) of following of following outlet temperature sensor (S1) input.
4. according to the control system of each said vehicle-mounted refrigeration plant in the claim 1 to 3, it is characterized in that said store memory contains heat exchanger exit water temperature a reference value (T3); Said heat exchanger coolant outlet place is provided with the heat exchanger outlet temperature sensor (S3) that detects heat exchanger exit water temperature value (t3)
Said heating plant also comprises through high-temperature gas changing-over valve and is connected the tail gas branch road on the engines tail tracheae; Said high-temperature gas changing-over valve can be regulated the exhaust flow that imports said tail gas branch road, and said tail gas branch road comprises the heater that the cooling water in tail gas on the tail gas branch road and the said heat exchanger is carried out heat exchange;
When said processor is less than or equal to heat exchanger entrance water temperature a reference value (T2) in said heat exchanger entrance water temperature value (t2); Control said high-temperature gas changing-over valve and increase the exhaust flow that imports the tail gas branch road; Controlling said refrigeration gauge tap breaks off; More said then heat exchanger exit water temperature value (t3) and heat exchanger exit water temperature a reference value (T3); In said heat exchanger exit water temperature value (t3) during greater than heat exchanger exit water temperature a reference value (T3); Control the exhaust flow that said high-temperature gas changing-over valve reduces to import the tail gas branch road, and the heat exchanger entrance water temperature value (t2) that continues to read heat exchanger entrance temperature sensor (S2) input relatively heat exchanger entrance water temperature value (t2) and heat exchanger entrance water temperature a reference value (T2) again, carry out down-stream according to comparative result;
And when said heat exchanger exit water temperature value (t3) is less than or equal to heat exchanger exit water temperature a reference value (T3); The heat exchanger entrance water temperature value (t2) that continues to read heat exchanger entrance temperature sensor (S2) input is relatively heat exchanger entrance water temperature value (t2) and heat exchanger entrance water temperature a reference value (T2) again, carries out down-stream according to comparative result.
5. according to the control system of the said vehicle-mounted refrigeration plant of claim 4, it is characterized in that said store memory contains outlet air temperature a reference value (T6), said heater tail gas exit is provided with the tail gas outlet temperature sensor (S6) that detects outlet air temperature value (t6);
Also comprise and send the ash disposal warning device that heater needs the information of ash disposal;
When said processor is less than or equal to heat exchanger exit water temperature a reference value (T3) in said heat exchanger exit water temperature value (t3); Control said high-temperature gas changing-over valve and increase the exhaust flow that imports the tail gas branch road; More said again outlet air temperature value (t6) and outlet air temperature a reference value (T6); In said outlet air temperature value (t6) during greater than outlet air temperature a reference value (T6); Trigger said ash disposal warning device and send information, and the heat exchanger entrance water temperature value (t2) that continues to read heat exchanger entrance temperature sensor (S2) input relatively heat exchanger entrance water temperature value (t2) and heat exchanger entrance water temperature a reference value (T2) again, carry out down-stream according to comparative result;
When said outlet air temperature value (t6) is less than or equal to outlet air temperature a reference value (T6); The heat exchanger entrance water temperature value (t2) that continues to read heat exchanger entrance temperature sensor (S2) input is relatively heat exchanger entrance water temperature value (t2) and heat exchanger entrance water temperature a reference value (T2) again, carries out down-stream according to comparative result.
6. the control method of a vehicle-mounted refrigeration plant heating plant is characterized in that, may further comprise the steps:
S0, the refrigeration gauge tap of vehicle-mounted cooling cycle system work is set on vehicle-mounted refrigeration plant, the refrigeration gauge tap is set controls break-make by processor; Heating plant is set comprises and other be connected on the bypass branch road on the engine cool water circulation pipe, on said bypass branch road, be provided with cooling water on the bypass branch road and generator in the solution heat exchanger that carries out heat exchange; The place is provided with the heat exchanger entrance temperature sensor (S2) that detects heat exchanger entrance water temperature value (t2) in said heat exchanger cooling water inlet; Preset heat exchanger entrance water temperature a reference value (T2) also is stored in it in memory;
S10, startup make processor, memory, heat exchanger entrance temperature sensor (S2) start working;
S40, heat exchanger entrance temperature sensor (S2) detect the heat exchanger entrance water temperature value (t2) at place, heat exchanger cooling water inlet, and processor reads the heat exchanger entrance water temperature a reference value (T2) in the memory;
S50, the more said heat exchanger entrance water temperature value of processor (t2) and heat exchanger entrance water temperature a reference value (T2) when heat exchanger entrance water temperature value (t2) gets into step S60 during greater than heat exchanger entrance water temperature a reference value (T2), otherwise get into step S70;
S60, processor are controlled said refrigeration gauge tap and are connected, and make vehicle-mounted refrigeration plant begin kind of refrigeration cycle work, return step S40;
S70, processor are controlled said refrigeration gauge tap and are broken off, and make vehicle-mounted refrigeration plant quit work, and return step S40.
7. according to the control method of the said vehicle-mounted refrigeration plant heating plant of claim 6, it is characterized in that, comprise also among the said step S0 that environment temperature sensor (S14) is set comes inspection vehicle internal milieu temperature value (t14); Setting module is set comes target setting temperature value (T14); Further comprising the steps of after the said step S10:
S31, environment temperature sensor (S14) inspection vehicle internal milieu temperature value (t14), processor read the heat exchanger entrance water temperature a reference value (T2) in the memory;
S33, the more said ambient temperature value of processor (t14) and target temperature value (T14) when said ambient temperature value (t14) during greater than target temperature value (T14), get into step S40; Otherwise get into step S31.
8. according to the control method of the said vehicle-mounted refrigeration plant heating plant of claim 7; It is characterized in that, also be included among the said step S0 to be provided with on the engine cool water circulation pipe and detect the outer outlet temperature sensor (S1) that follows that follows outlet water temperature value (t1) in the said engine cool water circulation pipe outside the coolant outlet place; Preset outer follow outlet water temperature a reference value (T1) and it is stored in the memory; Further comprising the steps of after the said step S10:
S21, follow outlet temperature sensor (S1) outward and detect the outer outlet water temperature value (t1) of following, processor reads the outer outlet water temperature a reference value (T1) of following;
S23, processor are more said to follow outlet water temperature value (t1) and follows outlet water temperature a reference value (T1) outward outward, when said outer follow outlet water temperature value (t1) greater than outside follow when exporting water temperature a reference value (T1) entering step S25; Otherwise get into step S27;
S25, said bypass branch road and engine cool water circulation pipe are connected, got into step S31;
S27, said bypass branch road and engine cool water circulation pipe are broken off, get into step S21.
9. according to the control method of each said vehicle-mounted refrigeration plant heating plant in the claim 6 to 8; It is characterized in that, comprise also among the said step S0 that heat exchanger outlet temperature sensor (S3) is set detects said heat exchanger coolant outlet place's heat exchanger exit water temperature value (t3); Heating plant is set also to be comprised through high-temperature gas changing-over valve and is connected the tail gas branch road on the engines tail tracheae; High-temperature gas changing-over valve is set regulates the exhaust flow that imports said tail gas branch road, heater is set on the tail gas branch road cooling water in tail gas on the tail gas branch road and the said heat exchanger is carried out heat exchange; Preset heat exchanger exit water temperature a reference value (T3) also is stored in it in memory; Said step 70 comprises step by step following:
S71, processor are controlled said refrigeration gauge tap and are broken off, and make vehicle-mounted cooling cycle system quit work; Processor control high-temperature gas changing-over valve increases the exhaust flow that imports the tail gas branch road;
S72, heat exchanger outlet temperature sensor (S3) detect heat exchanger exit water temperature value (t3), and processor reads heat exchanger exit water temperature a reference value (T3);
S73, processor be heat exchanger exit water temperature value (t3) and heat exchanger exit water temperature a reference value (T3) relatively, at heat exchanger exit water temperature value (t3) entering step S74 during greater than heat exchanger exit water temperature a reference value (T3); Otherwise get into step S40;
S74, processor are controlled the exhaust flow that said high-temperature gas changing-over valve reduces to import the tail gas branch road, return step S40.
10. according to the control method of the said vehicle-mounted refrigeration plant heating plant of claim 9, it is characterized in that, also be included in heater tail gas exit among the said step S0 tail gas outlet temperature sensor (S6) that detects outlet air temperature value (t6) is set; Setting can be sent the ash disposal warning device that heater needs the information of ash disposal; Preset outlet air temperature a reference value (T6) also is stored in it in memory; Said step 73 comprises step by step following:
S75, processor be heat exchanger exit water temperature value (t3) and heat exchanger exit water temperature a reference value (T3) relatively, at heat exchanger exit water temperature value (t3) entering step S74 during greater than heat exchanger exit water temperature a reference value (T3); Otherwise get into step S76;
S76, tail gas outlet temperature sensor (S6) detect outlet air temperature value (t6), and processor reads outlet air temperature a reference value (T6);
S77, processor be outlet air temperature value (t6) and outlet air temperature a reference value (T6) relatively, in said outlet air temperature value (t6) during greater than outlet air temperature a reference value (T6), and entering step S78; Otherwise get into step S40;
S78, processor trigger said ash disposal warning device and send information, return step S40.
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