CN110529227A - Diesel engine cooling system with variable water flow becomes height above sea level control strategy - Google Patents
Diesel engine cooling system with variable water flow becomes height above sea level control strategy Download PDFInfo
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- CN110529227A CN110529227A CN201810499558.7A CN201810499558A CN110529227A CN 110529227 A CN110529227 A CN 110529227A CN 201810499558 A CN201810499558 A CN 201810499558A CN 110529227 A CN110529227 A CN 110529227A
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- diesel engine
- cooling system
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- cooling
- deviation
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/02—Controlling of coolant flow the coolant being cooling-air
- F01P7/04—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
- F01P7/044—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio using hydraulic drives
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
- F01P7/164—Controlling of coolant flow the coolant being liquid by thermostatic control by varying pump speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
- F01P7/167—Controlling of coolant flow the coolant being liquid by thermostatic control by adjusting the pre-set temperature according to engine parameters, e.g. engine load, engine speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2025/00—Measuring
- F01P2025/04—Pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2025/00—Measuring
- F01P2025/08—Temperature
- F01P2025/13—Ambient temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2025/00—Measuring
- F01P2025/60—Operating parameters
- F01P2025/62—Load
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2025/00—Measuring
- F01P2025/60—Operating parameters
- F01P2025/64—Number of revolutions
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Feedback Control In General (AREA)
Abstract
A kind of diesel engine cooling system with variable water flow change height above sea level control strategy, atmospheric pressure, atmospheric temperature, diesel engine speed, diesel load in the 0m~5500m altitude ranges arrived according to data collecting module collected in cooling system, coolant temperature deviation and its change rate signal are converted to analog signal to Electric Actuator by Varied scope fuzzy control device, to control Electric Actuator real-time control Diesel Engine Coolants total flow, large and small cycles flow and cooling air delivery, cooling system parasitic loss is reduced.The control strategy uses the change height above sea level cooling system with variable water flow integrated control based on Varied scope fuzzy control strategy, in face of Different Altitude difference operating condition, realize cooling water pump, thermostat, cooling fan Collaborative Control, rationally control Diesel Engine Coolants total flow, large and small cycles flow and cooling air delivery.
Description
Technical field
The present invention relates to Diesel Engine Technique Fields, become height above sea level control more particularly to a kind of diesel engine cooling system with variable water flow
Strategy.
Background technique
The chain drives such as vehicle, engineering machinery are when plateau is run, due to heat dissipation performance variation and diesel oil machine-heating load
Increase etc. lead to problems such as diesel engine occur cooling water easily boils, the decline of cooling system cooling capacity, body easily overheat, and will most
Diesel engine is caused to there is different degrees of decline in highlands continuous operation ability and operation intensity eventually.These problems can be with
It is attributed to diesel engine cooling system and working process of diesel engine matching variation, High aititude cooling system control strategy is immature.
Part of cooling system includes thermostat, cooling water pump, cooling fan, Diesel Engine Mechanical formula cooling system cooling capacity
According to diesel engine maximum heating load operating condition design, part of cooling system (water pump, fan) is directly driven by V belt translation by crankshaft,
The driving method couples water pump, rotation speed of the fan with diesel engine speed, in face of the complex work ring of Different Altitude, different operating conditions
The radiating requirements in border, diesel engine cannot be met.It is paraffin thermostat, tool that more thermostat is applied in diesel engines at present
There is the characteristic of response delay and " hysteresis ", and is not to close between the aperture and coolant temperature of paraffin thermostat correspondingly
System can not achieve the accurate control to the distribution of coolant liquid large and small circular flow.
With the continuous improvement of internal combustion engine reinforcing degree, the thermic load of components is consequently increased, and only passes through cooling water
Heat accounts for fuel heat release total amount 20~30% are taken away, from the angle of the engine cycle thermal efficiency, it is desirable to pass through cooling system
The heat dissipation capacity of system will be lacked as far as possible, but consider the limitation of part heat load and reliability, the heat dissipation of cooling system simultaneously
Amount again cannot be very few, this requires optimizing internal-combustion engine cooling system as far as possible, reduces heat transfer loss, improves engine thermal efficiency.
Currently, being directed to the improvement of diesel engine cooling system mainly around in part of cooling system (such as water pump, fan, section temperature
Device) single control in terms of, control strategy mostly uses PID control, but under the particular surroundings of plateau, the optimization control of single part
System is insufficient for the radiating requirements of diesel altitude-variable, and controls precision and be not being met.
Summary of the invention
For technological deficiency existing for existing diesel cooling system under High aititude operating condition, the present invention provides a kind of diesel engine
Cooling system with variable water flow becomes height above sea level control strategy, which uses the change height above sea level unsteady flow based on Varied scope fuzzy control strategy
Cooling system integrated control is measured, Different Altitude difference operating condition is faced, realizes the collaboration control of cooling water pump, thermostat, cooling fan
System rationally controls Diesel Engine Coolants total flow, large and small cycles flow and cooling air delivery.
As above design, the technical scheme is that a kind of diesel engine cooling system with variable water flow becomes height above sea level control strategy,
It is characterized in that: atmospheric pressure, big temperature in the 0m~5500m altitude ranges arrived according to data collecting module collected in cooling system
Degree, diesel engine speed, diesel load, Varied scope fuzzy control device are converted to coolant temperature deviation and its change rate signal
Analog signal is to Electric Actuator, to control Electric Actuator real-time control Diesel Engine Coolants total flow, large and small cycles stream
Amount and cooling air delivery reduce cooling system parasitic loss.
Above-mentioned Varied scope fuzzy control device uses Diesel Engine Coolants temperature deviation e=Te-TedAnd its change rateMake
To input, using cooling fan proportional overflow valve opening increment, thermostat aperture increment and cooling water pump incremental speed u conduct
The formula of output, deviation and the transformation of deviation variation rate domain is E=< keE+0.5>, EC=<kecEc+0.5>, wherein "<>" indicates
Contraction-expansion factor α (x) is added in basic domain under the premise of basic domain rule is constant in downward rounding operation, i.e., initial opinion
Domain [- E, E] is [- α (x) E, α (x) E] by the way that contraction-expansion factor α (x) variation is added, and so that domain is become smaller with deviation and is shunk, with inclined
Difference increases and expands, to mention high control precision, wherein α (x) is the continuous function of deviation variables e, stringent single on [0, E]
It adjusts.
The present invention reads environmental pressure, temperature and diesel engine speed within the scope of current altitude, load and passes through coolant liquid
Temperature calibration MAP obtains best coolant temperature under current state, according to proportional overflow valve opening, cooling water pump revolving speed and Jie Wen
Device aperture demarcates MAP and adjusts cooling flow, by feedback coolant temperature deviation and its change rate signal, Varied scope fuzzy control device
Analog signal is converted electrical signals to actuator, intensity of cooling is adjusted in real time, reaches cooling fan, cooling water pump, thermostat
The purpose of Collaborative Control is realized to reduce diesel engine cooling system parasitic loss and becomes height above sea level in 0m~5500m altitude ranges
Diesel Engine Coolants total flow, large and small cycles flow and cooling under (atmospheric temperature, atmospheric pressure), variable working condition (load, revolving speed)
The real-time optimistic control of air mass flow.
Detailed description of the invention
Fig. 1 is Varied scope fuzzy control system block diagram of the invention；
Fig. 2 is change height above sea level variable flow cooling control system figure of the invention；
Fig. 3 is cooling control system flow chart of the invention.
2 description of symbols of attached drawing: 1- hydraulic oil container；2- hydraulic oil pump；3- proportional pressure control valve；4- temperature thermostat；5- liquid
Pressure motor；6- variable water pump；7,8- temperature sensor；9,10,11- flow sensor；12- proportional overflow valve opening executes
Device；13- temperature thermostat opening actuator；14- flow-changing water revolution speed actuator；15- power supply.
Specific embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.It should be appreciated that described herein
Specific embodiment be only used to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, a kind of diesel engine cooling system with variable water flow becomes height above sea level control strategy, using Varied scope fuzzy control skill
Art, the wherein practical coolant temperature of input language variables choice of Varied scope fuzzy control device and the deviation e=T of target temperaturee-
TedAnd its change rateOutput quantity is cooling fan proportional overflow valve opening increment, thermostat aperture increment and cooling
Pump rotary speed increment u.On the basis of basic fuzzy control domain (initial domain) [- E, E], it is added contraction-expansion factor α (x), initially
Domain [- E, E] is [- α (x) E, α (x) E] by contraction-expansion factor α (x) variation, so that domain is become smaller with deviation and is shunk, with deviation
Increase and expand, to mention high control precision.Under Different Altitude environmental condition, according to data acquisition module block signal, inquiry cooling
Pump rotary speed, thermostat aperture and proportional overflow valve opening MAP control coolant rate and cooling air delivery, through variable universe
Processing of the fuzzy controller to input signal, adjusts intensity of cooling in real time, and the cooling system is made to realize that change height above sea level full working scope is adaptive
It should control.
As shown in Figure 2: diesel altitude-variable variable flow cooling control system is executed by hydraulic fan proportional overflow valve opening
Device 12, temperature thermostat actuator 13, variable water pump actuator 14, cooling-water temperature transmitter 7,8, coolant rate biography
Sensor 9,10,11 and Diesel Engine Control unit ECU composition.Cooling water pump is driven by motor, and cooling fan is driven by hydraulic motor
It is dynamic, 3 aperture of proportional pressure control valve, 4 aperture of 6 revolving speed of variable water pump and temperature thermostat are controlled by ECU.The coolant temperature
Sensor 7, flow sensor 11 are mounted on the coolant outlet road between diesel engine outlet and temperature thermostat 4, cold
But liquid stream quantity sensor 9,10 is separately mounted to two exits of temperature thermostat 4, and the cooling-water temperature transmitter 8 is pacified
Mounted in the coolant pipe road of radiator outlet；The input signal of the ECU control unit has: Different Altitude atmospheric pressure, temperature
The environmental conditions parameters such as degree, density, coolant liquid boiling point and the operating conditions such as cooling system thermal parameter and diesel engine speed, load
Parameter；It is hydraulic fan proportional pressure control valve opening actuator 12, the execution of temperature thermostat that ECU control unit, which exports control object,
Device 13, variable water pump actuator 14.
Realization principle of the present invention is as follows:
The diesel altitude-variable cooling system with variable water flow control strategy, which is characterized in that the basic domain of fuzzy controller is drawn
Point, if the basic domain of deviation signal is [- e, e], quantization domain is discrete set {-n0,-n0+1,…,0,…n0-1,n0,
Defining deviation quantizing factor isIf the basic domain of deviation variation rate is [- ec, ec], quantization domain is discrete set
{-n1,-n1+1,…,0,…n1-1,n1, defining deviation quantizing factor isIf the basic opinion of fuzzy controller output
Domain is [- u, u], and quantization domain is discrete set {-n2,-n2+1,…,0,…n2-1,n2, defining deviation quantizing factor isDeviation and the formula of deviation variation rate domain transformation are E=< keE+0.5>, EC=<kecEc+0.5 >, wherein E and EC
Respectively quantify the deviation and deviation variation rate on domain, is fuzzy quantity；"<>" indicates downward rounding operation, e, ec, n0、n1、
n2Depending on practical change height above sea level unsteady flow cooling system radiating requirements.
Choose 7 Linguistic Values about E, EC, U for linguistic variable: negative big (PB), it is negative in (PM), bear small (PS), zero
(ZE), just small (NS), center (NM), honest (NB), wherein it is large, medium and small, zero indicate its departure degree.In basic domain rule
Under the premise of constant, contraction-expansion factor α (x) is added in basic domain, i.e., initial domain [- E, E] is changed by contraction-expansion factor α (x)
For [- α (x) E, α (x) E], domain is made to become smaller with deviation and shrink, increases with deviation and expand, so that high control precision is mentioned,
Middle α (x) is the continuous function of deviation variables e, the strictly monotone on [0, E].
Varied scope fuzzy control follows a basic principle: when deviation is big or it is larger when, select control amount to eliminate as early as possible
Based on deviation；When deviation is smaller, control amount is selected it is noted that preventing overshoot, to guarantee that the stability of system is mainly to set out
Point obtains following Varied scope fuzzy control rule list based on the principle and expertise.
Become in cooling flow real-time control becoming height above sea level, control unit ECU reads current environment pressure, temperature and bavin first
Oil machine revolving speed, load simultaneously obtain best coolant temperature under current state by coolant temperature calibration MAP, according to proportional overflow
Valve opening, cooling water pump revolving speed and thermostat aperture calibration MAP adjust cooling flow, by feedback coolant temperature deviation and its change
Rate signal, Varied scope fuzzy control device convert electrical signals to analog signal to actuator, adjust intensity of cooling in real time, specifically
Control flow is as shown in figure 3, achieve the purpose that cooling fan, cooling water pump, thermostat Collaborative Control, so that it is cold to reduce diesel engine
But system parasitic losses, realize 0~5500m become altitude environment under the conditions of, diesel engine cooling system intensity of cooling in real time most
Excellent control.
Claims (2)
1. a kind of diesel engine cooling system with variable water flow becomes height above sea level control strategy, it is characterised in that: adopted according to data in cooling system
Collect atmospheric pressure, atmospheric temperature, diesel engine speed, diesel load in the collected 0m~5500m altitude ranges of module, becomes opinion
Coolant temperature deviation and its change rate signal are converted to analog signal to Electric Actuator, to control by domain fuzzy controller
Electric Actuator real-time control Diesel Engine Coolants total flow, large and small cycles flow and cooling air delivery reduce cooling system
Parasitic loss.
2. a kind of diesel engine cooling system with variable water flow according to claim 1 becomes height above sea level control strategy, it is characterised in that: on
Varied scope fuzzy control device is stated using Diesel Engine Coolants temperature deviation e=Te-TedAnd its change rateAs input, adopt
Use cooling fan proportional overflow valve opening increment, thermostat aperture increment and cooling water pump incremental speed u as output, deviation
Formula with the transformation of deviation variation rate domain is E=< keE+0.5>, EC=<kecEc+0.5>, wherein "<>" indicates to be rounded downwards
Under the premise of basic domain rule is constant contraction-expansion factor α (x) is added in basic domain, i.e., initial domain [- E, E] in operation
It is [- α (x) E, α (x) E] by the way that contraction-expansion factor α (x) variation is added, domain is made to become smaller with deviation and shrink, with deviation increase
Expansion, to mention high control precision, wherein α (x) is the continuous function of deviation variables e, the strictly monotone on [0, E].
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| CN201810499558.7A CN110529227B (en) | 2018-05-23 | 2018-05-23 | Variable-altitude control strategy for diesel engine variable-flow cooling system |
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| CN201810499558.7A CN110529227B (en) | 2018-05-23 | 2018-05-23 | Variable-altitude control strategy for diesel engine variable-flow cooling system |
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| CN110529227B CN110529227B (en) | 2022-04-22 |
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Cited By (7)
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| CN111577441A (en) * | 2020-06-11 | 2020-08-25 | 汉腾新能源汽车科技有限公司 | Control method of engine cooling system |
| CN112693365A (en) * | 2021-01-04 | 2021-04-23 | 吉林大学 | Power coupling heat control system of extended range electric automobile and control method thereof |
| CN113027590A (en) * | 2021-03-12 | 2021-06-25 | 中国人民解放军海军工程大学 | Control method of internal combustion engine intelligent cooling system based on improved control algorithm |
| CN113494347A (en) * | 2021-08-09 | 2021-10-12 | 一汽解放汽车有限公司 | Control method of engine cooling system and engine cooling system |
| CN114076042A (en) * | 2020-08-11 | 2022-02-22 | 郑州宇通客车股份有限公司 | Engine heat management method and vehicle adopting same |
| CN114320560A (en) * | 2022-01-04 | 2022-04-12 | 中国人民解放军陆军装甲兵学院 | Adaptive adjustment control method for engine cooling system of crawler vehicle in plateau environment |
| CN115143007A (en) * | 2021-03-30 | 2022-10-04 | 广州汽车集团股份有限公司 | Temperature control module control method and device and computer storage medium |
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| CN110529227B (en) | 2022-04-22 |
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