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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 PDF

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Publication number
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
variable
cooling system
deviation
flow
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CN110529227B (en
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刘瑞林
杨春浩
周广猛
张众杰
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Military Transportation University of PLA
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00Controlling of coolant flow
    • F01P7/02Controlling of coolant flow the coolant being cooling-air
    • F01P7/04Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
    • F01P7/044Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio using hydraulic drives
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00Controlling of coolant flow
    • F01P7/14Controlling of coolant flow the coolant being liquid
    • F01P7/16Controlling of coolant flow the coolant being liquid by thermostatic control
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00Controlling of coolant flow
    • F01P7/14Controlling of coolant flow the coolant being liquid
    • F01P7/16Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/164Controlling of coolant flow the coolant being liquid by thermostatic control by varying pump speed
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00Controlling of coolant flow
    • F01P7/14Controlling of coolant flow the coolant being liquid
    • F01P7/16Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/167Controlling 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00Measuring
    • F01P2025/04Pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00Measuring
    • F01P2025/08Temperature
    • F01P2025/13Ambient temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00Measuring
    • F01P2025/60Operating parameters
    • F01P2025/62Load
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00Measuring
    • F01P2025/60Operating parameters
    • F01P2025/64Number 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)
  • Feedback Control In General (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

一种柴油机变流量冷却系统变海拔控制策略,根据冷却系统中数据采集模块采集到的0m~5500m海拔范围内大气压力、大气温度、柴油机转速、柴油机负荷,变论域模糊控制器将冷却液温度偏差及其变化率信号转换为模拟信号至电动执行器,从而控制电动执行器实时控制柴油机冷却液总流量、大小循环流量和冷却空气流量,降低冷却系统寄生损失。该控制策略采用基于变论域模糊控制策略的变海拔变流量冷却系统集成控制,面对不同海拔不同工况,实现冷却水泵、节温器、冷却风扇的协同控制,合理控制柴油机冷却液总流量、大小循环流量和冷却空气流量。

A variable-altitude control strategy for a variable-flow cooling system of a diesel engine. According to the atmospheric pressure, atmospheric temperature, diesel engine speed, and diesel engine load collected by the data acquisition module in the cooling system within the altitude range of 0m to 5500m, the variable domain fuzzy controller controls the coolant temperature The deviation and its rate of change signals are converted into analog signals and sent to the electric actuator, so that the electric actuator can control the total flow of diesel engine coolant, large and small circulation flow and cooling air flow in real time, reducing the parasitic loss of the cooling system. The control strategy adopts the integrated control of the variable altitude and variable flow cooling system based on the variable universe fuzzy control strategy. In the face of different altitudes and different working conditions, it realizes the coordinated control of the cooling water pump, thermostat, and cooling fan, and reasonably controls the total flow of the diesel engine coolant. , size circulation flow and cooling air flow.

Description

柴油机变流量冷却系统变海拔控制策略Variable Altitude Control Strategy for Variable Flow Cooling System of Diesel Engine

技术领域technical field

本发明涉及柴油机技术领域,特别是涉及一种柴油机变流量冷却系统变海拔控制策略。The invention relates to the technical field of diesel engines, in particular to a variable altitude control strategy for a variable flow cooling system of a diesel engine.

背景技术Background technique

车辆、工程机械等动力装备在高原运行时,由于散热性能变差以及柴油机热负荷增大等导致柴油机出现冷却水易开锅、冷却系统冷却能力下降、机体易过热等问题,并将最终导致柴油机在高原地区持续作业能力和作业强度均存在不同程度的下降。这些问题可以归结为柴油机冷却系统与柴油机工作过程匹配性变差、高海拔冷却系统控制策略不成熟。When vehicles, construction machinery and other power equipment are running on high altitudes, due to the deterioration of heat dissipation performance and the increase of the heat load of the diesel engine, the cooling water of the diesel engine is easy to boil, the cooling capacity of the cooling system is reduced, and the body is easy to overheat, etc. The continuous operating capacity and operating intensity in the plateau area have declined to varying degrees. These problems can be attributed to the poor match between the cooling system of the diesel engine and the working process of the diesel engine, and the immature control strategy of the high-altitude cooling system.

冷却系统部件包括节温器、冷却水泵、冷却风扇,柴油机机械式冷却系统冷却能力按照柴油机最大热负荷工况设计,由曲轴通过带传动直接驱动冷却系统部件(水泵、风扇),该驱动方式使得水泵、风扇转速与柴油机转速耦合,面对不同海拔、不同工况的复杂工作环境,柴油机的散热需求不能得到满足。目前柴油机中应用较多的节温器为石蜡节温器,其具有响应延时和“滞回”的特性,且石蜡节温器的开度与冷却液温度之间并不是一一对应的关系,不能实现对冷却液大、小循环流量分配的精确控制。The cooling system components include thermostat, cooling water pump and cooling fan. The cooling capacity of the diesel engine mechanical cooling system is designed according to the maximum heat load condition of the diesel engine. The crankshaft directly drives the cooling system components (water pump, fan) through the belt drive. This driving method makes The speed of the water pump and fan is coupled with the speed of the diesel engine. Faced with complex working environments with different altitudes and different working conditions, the heat dissipation requirements of the diesel engine cannot be met. At present, the most widely used thermostat in diesel engines is the paraffin thermostat, which has the characteristics of response delay and "hysteresis", and there is not a one-to-one correspondence between the opening of the paraffin thermostat and the temperature of the coolant , It is impossible to realize the precise control of the large and small circulation flow distribution of the coolant.

随着内燃机强化程度的不断提高,其零部件的热负荷也随之增加,仅通过冷却水带走热量占燃料放热总量的20~30%,从内燃机循环热效率的角度出发,希望通过冷却系统的散热量要尽可能的少,但同时考虑到零部件热负荷与可靠性的限制,冷却系统的散热量又不能过少,这就要求尽可能优化内燃机冷却系统,减少传热损失,提高发动机热效率。With the continuous improvement of the internal combustion engine's strengthening degree, the heat load of its components also increases. Only the heat taken away by the cooling water accounts for 20-30% of the total heat release of the fuel. From the perspective of the internal combustion engine cycle heat efficiency, it is hoped that through cooling The heat dissipation of the system should be as small as possible, but at the same time considering the thermal load and reliability constraints of the components, the heat dissipation of the cooling system should not be too small, which requires optimizing the cooling system of the internal combustion engine as much as possible to reduce heat transfer losses and improve engine thermal efficiency.

目前,针对柴油机冷却系统的改进主要围绕在冷却系统部件(如水泵、风扇、节温器)的单一控制方面,控制策略大都采用PID控制,但在高原特殊环境下,单一部件的优化控制不足以满足柴油机变海拔的散热需求,且控制精度得不到满足。At present, the improvement of the diesel engine cooling system mainly focuses on the single control of the cooling system components (such as water pumps, fans, and thermostats), and most of the control strategies use PID control. To meet the heat dissipation requirements of diesel engines at variable altitudes, and the control accuracy cannot be met.

发明内容Contents of the invention

针对高海拔工况下现有柴油机冷却系统存在的技术缺陷,本发明提供一种柴油机变流量冷却系统变海拔控制策略,该控制策略采用基于变论域模糊控制策略的变海拔变流量冷却系统集成控制,面对不同海拔不同工况,实现冷却水泵、节温器、冷却风扇的协同控制,合理控制柴油机冷却液总流量、大小循环流量和冷却空气流量。Aiming at the technical defects existing in the existing diesel engine cooling system under high-altitude working conditions, the present invention provides a variable-altitude control strategy for the variable-flow cooling system of the diesel engine. Control, in the face of different altitudes and different working conditions, realize the coordinated control of cooling water pumps, thermostats, and cooling fans, and reasonably control the total flow of diesel engine coolant, large and small circulation flow, and cooling air flow.

如上构思,本发明的技术方案是:一种柴油机变流量冷却系统变海拔控制策略,其特征在于:根据冷却系统中数据采集模块采集到的0m~5500m海拔范围内大气压力、大气温度、柴油机转速、柴油机负荷,变论域模糊控制器将冷却液温度偏差及其变化率信号转换为模拟信号至电动执行器,从而控制电动执行器实时控制柴油机冷却液总流量、大小循环流量和冷却空气流量,降低冷却系统寄生损失。As conceived above, the technical solution of the present invention is: a diesel engine variable flow cooling system variable altitude control strategy, which is characterized in that: according to the atmospheric pressure, atmospheric temperature, and diesel engine speed within the altitude range of 0m to 5500m collected by the data acquisition module in the cooling system , Diesel engine load, the variable domain fuzzy controller converts the coolant temperature deviation and its change rate signal into an analog signal to the electric actuator, so as to control the electric actuator to control the total flow of diesel engine coolant, the size of the circulation flow and the cooling air flow in real time. Reduce cooling system parasitic losses.

上述变论域模糊控制器采用柴油机冷却液温度偏差e=Te-Ted及其变化率作为输入,采用冷却风扇比例溢流阀开度增量、节温器开度增量以及冷却水泵转速增量u作为输出,偏差和偏差变化率论域变换的公式为E=<kee+0.5>、EC=<kecec+0.5>,其中“<>”表示向下取整运算,在基本论域规则不变的前提下,在基本论域中加入伸缩因子α(x),即初始论域[-E,E]通过加入伸缩因子α(x)变化为[-α(x)E,α(x)E],使论域随偏差变小而收缩,随偏差增大而扩张,从而提高控制精度,其中α(x)是偏差变量e的连续函数,在[0,E]上严格单调。The above-mentioned variable domain fuzzy controller adopts diesel engine coolant temperature deviation e=T e -T ed and its change rate As input, the cooling fan proportional overflow valve opening increment, thermostat opening increment and cooling water pump rotational speed increment u are used as output, and the formula for the domain transformation of deviation and deviation change rate is E=<k e e+ 0.5>, EC=<k ec ec+0.5>, where “<>” represents the rounding down operation, and on the premise that the rules of the basic domain of discourse remain unchanged, the scaling factor α(x) is added to the basic domain of discourse, namely The initial domain of discourse [-E, E] is changed to [-α(x)E, α(x)E] by adding the expansion factor α(x), so that the domain of discourse shrinks as the deviation decreases and expands as the deviation increases , so as to improve the control accuracy, where α(x) is a continuous function of the deviation variable e, which is strictly monotonous on [0,E].

本发明读取当前海拔范围内的环境压力、温度和柴油机转速、负荷并通过冷却液温度标定MAP得到当前状态下最佳冷却液温度,根据比例溢流阀开度、冷却水泵转速和节温器开度标定MAP调节冷却流量,由反馈冷却液温度偏差及其变化率信号,变论域模糊控制器将电信号转换为模拟信号至执行器,实时调节冷却强度,达到冷却风扇、冷却水泵、节温器协同控制的目的,从而降低柴油机冷却系统寄生损失,实现0m~5500m海拔范围内变海拔(大气温度、大气压力)、变工况(负荷、转速)下柴油机冷却液总流量、大小循环流量和冷却空气流量的实时最优控制。The invention reads the ambient pressure, temperature, diesel engine speed and load within the current altitude range, and obtains the best coolant temperature in the current state through the coolant temperature calibration MAP, according to the proportional overflow valve opening, cooling water pump speed and thermostat The opening calibration MAP adjusts the cooling flow. By feeding back the coolant temperature deviation and its change rate signal, the variable domain fuzzy controller converts the electrical signal into an analog signal and sends it to the actuator to adjust the cooling intensity in real time. The purpose of synergistic control of the thermostat is to reduce the parasitic loss of the diesel engine cooling system, and realize the total flow rate of the diesel engine coolant and the large and small circulation flow rate under variable altitude (atmospheric temperature, atmospheric pressure) and variable working conditions (load, speed) within the altitude range of 0m to 5500m and real-time optimal control of cooling air flow.

附图说明Description of drawings

图1是本发明的变论域模糊控制系统框图;Fig. 1 is the variable universe fuzzy control system block diagram of the present invention;

图2是本发明的变海拔变流量冷却控制系统图;Fig. 2 is a diagram of the variable altitude and variable flow cooling control system of the present invention;

图3是本发明的冷却控制系统流程图。Fig. 3 is a flowchart of the cooling control system of the present invention.

附图2标记说明:1-液压油箱;2-液压油泵;3-比例溢流阀;4-变温度节温器;5-液压马达;6-变流量水泵;7、8-温度传感器;9、10、11-流量传感器;12-比例溢流阀开度执行器;13-变温度节温器开度执行器;14-变流量水泵转速执行器;15-电源。Description of attached drawings 2 signs: 1-hydraulic oil tank; 2-hydraulic oil pump; 3-proportional overflow valve; 4-variable temperature thermostat; 5-hydraulic motor; 6-variable flow water pump; 7, 8-temperature sensor; 9 , 10, 11-flow sensor; 12-proportional relief valve opening actuator; 13-variable temperature thermostat opening actuator; 14-variable flow water pump speed actuator; 15-power supply.

具体实施方式Detailed ways

以下结合附图和具体实施例对本发明作进一步详细说明。应当理解,此处所描述的具体实施例仅仅用以解释本发明,并不用于限定本发明。The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

如图1所示,一种柴油机变流量冷却系统变海拔控制策略,应用变论域模糊控制技术,其中变论域模糊控制器的输入语言变量选择实际冷却液温度与目标温度的偏差e=Te-Ted及其变化率输出量为冷却风扇比例溢流阀开度增量、节温器开度增量以及冷却水泵转速增量u。在基本模糊控制论域(初始论域)[-E,E]基础上,加入伸缩因子α(x),初始论域[-E,E]通过伸缩因子α(x)变化为[-α(x)E,α(x)E],使论域随偏差变小而收缩,随偏差增大而扩张,从而提高控制精度。不同海拔环境条件下,根据数据采集模块信号,查询冷却水泵转速、节温器开度及比例溢流阀开度MAP,控制冷却液流量和冷却空气流量,经变论域模糊控制器对输入信号的处理,实时调节冷却强度,使该冷却系统实现变海拔全工况自适应控制。As shown in Figure 1, a variable altitude control strategy for a diesel engine variable flow cooling system applies variable universe fuzzy control technology, in which the input language variable of the variable universe fuzzy controller selects the deviation between the actual coolant temperature and the target temperature e=T e -T ed and its rate of change The output is the opening increment of the proportional overflow valve of the cooling fan, the opening increment of the thermostat and the speed increment of the cooling water pump u. On the basis of the basic fuzzy control domain (initial domain) [-E, E], adding expansion factor α(x), the initial domain [-E, E] changes to [-α( x)E,α(x)E], so that the domain of discourse shrinks as the deviation decreases, and expands as the deviation increases, thereby improving the control accuracy. Under different altitude environmental conditions, according to the signal of the data acquisition module, query the cooling water pump speed, thermostat opening and proportional overflow valve opening MAP, control the flow of cooling liquid and cooling air, and the fuzzy controller of the variable domain controls the input signal The cooling intensity is adjusted in real time, so that the cooling system can realize adaptive control of all working conditions at variable altitudes.

如图2所示:柴油机变海拔变流量冷却控制系统,由液压风扇比例溢流阀开度执行器12、变温度节温器执行器13、变流量水泵执行器14、冷却液温度传感器7、8、冷却液流量传感器9、10、11以及柴油机控制单元ECU组成。冷却水泵由电机驱动,冷却风扇由液压马达驱动,由ECU控制比例溢流阀3开度、变流量水泵6转速与变温度节温器4开度。所述冷却液温度传感器7、流量传感器11安装在柴油机出口与变温度节温器4之间的冷却液出口管路上,冷却液流量传感器9、10分别安装在变温度节温器4的两个出口处,所述冷却液温度传感器8安装在散热器出口的冷却液管路上;所述ECU控制单元的输入信号有:不同海拔大气压力、温度、密度、冷却液沸点等环境条件参数和冷却系统热力参数,以及柴油机转速、负荷等工况参数;ECU控制单元输出控制对象为液压风扇比例溢流阀开度执行器12、变温度节温器执行器13、变流量水泵执行器14。As shown in Figure 2: the variable altitude and variable flow cooling control system for diesel engines consists of hydraulic fan proportional relief valve opening actuator 12, variable temperature thermostat actuator 13, variable flow water pump actuator 14, coolant temperature sensor 7, 8. Composed of coolant flow sensors 9, 10, 11 and diesel engine control unit ECU. The cooling water pump is driven by a motor, the cooling fan is driven by a hydraulic motor, and the ECU controls the proportional overflow valve 3 opening degrees, the variable flow water pump 6 speeds and the variable temperature thermostat 4 opening degrees. The coolant temperature sensor 7 and the flow sensor 11 are installed on the coolant outlet pipeline between the outlet of the diesel engine and the variable temperature thermostat 4, and the coolant flow sensors 9 and 10 are respectively installed on two ends of the variable temperature thermostat 4. At the outlet, the coolant temperature sensor 8 is installed on the coolant pipeline at the outlet of the radiator; the input signals of the ECU control unit include: atmospheric pressure at different altitudes, temperature, density, coolant boiling point and other environmental condition parameters and cooling system Thermal parameters, as well as working condition parameters such as diesel engine speed and load; the output control objects of the ECU control unit are hydraulic fan proportional relief valve opening actuator 12, variable temperature thermostat actuator 13, and variable flow water pump actuator 14.

本发明实现原理如下:The realization principle of the present invention is as follows:

该柴油机变海拔变流量冷却系统控制策略,其特征在于,模糊控制器基本论域划分,设偏差信号的基本论域为[-e,e],量化论域为离散集合{-n0,-n0+1,…,0,…n0-1,n0},定义偏差量化因子为设偏差变化率的基本论域为[-ec,ec],量化论域为离散集合{-n1,-n1+1,…,0,…n1-1,n1},定义偏差量化因子为设模糊控制器输出的基本论域为[-u,u],量化论域为离散集合{-n2,-n2+1,…,0,…n2-1,n2},定义偏差量化因子为偏差和偏差变化率论域变换的公式为E=<kee+0.5>、EC=<kecec+0.5>,其中E和EC分别为量化论域上的偏差和偏差变化率,均为模糊量;“<>”表示向下取整运算,e、ec、n0、n1、n2根据实际变海拔变流冷却系统散热需求而定。The control strategy of the diesel engine variable altitude and variable flow cooling system is characterized in that the basic domain of discourse of the fuzzy controller is divided, and the basic domain of discourse of the deviation signal is [-e, e], and the domain of quantification is a discrete set {-n 0 ,- n 0 +1,…,0,…n 0 -1,n 0 }, define the deviation quantization factor as Let the basic discourse domain of deviation change rate be [-ec,ec], quantize discourse domain as discrete set {-n 1 ,-n 1 +1,…,0,…n 1 -1,n 1 }, define deviation quantization factor is Let the basic discourse domain output by the fuzzy controller be [-u,u], the quantization discourse domain be a discrete set {-n 2 ,-n 2 +1,…,0,…n 2 -1,n 2 }, define the deviation The quantization factor is The formulas for the domain transformation of deviation and deviation change rate are E=<k e e+0.5>, EC=<k ec ec+0.5>, where E and EC are respectively the deviation and deviation change rate in the quantitative universe, both are Fuzzy quantity; "<>" indicates the rounding down operation, and e, ec, n 0 , n 1 , n 2 are determined according to the actual heat dissipation requirements of the variable-altitude variable-flow cooling system.

为语言变量选取关于E、EC、U的7个语言值:负大(PB)、负中(PM)、负小(PS)、零(ZE)、正小(NS)、正中(NM)、正大(NB),其中大、中、小、零表示其偏离程度。在基本论域规则不变的前提下,基本论域中加入伸缩因子α(x),即初始论域[-E,E]通过伸缩因子α(x)变化为[-α(x)E,α(x)E],使论域随偏差变小而收缩,随偏差增大而扩张,从而提高控制精度,其中α(x)是偏差变量e的连续函数,在[0,E]上严格单调。Select seven linguistic values about E, EC, and U for linguistic variables: negative big (PB), negative middle (PM), negative small (PS), zero (ZE), positive small (NS), positive middle (NM), Zhengda (NB), where large, medium, small, and zero represent the degree of deviation. On the premise that the rules of the basic domain of discourse remain unchanged, the expansion factor α(x) is added to the basic domain of discourse, that is, the initial domain of discourse [-E,E] changes to [-α(x)E, α(x)E], so that the domain of discourse shrinks as the deviation decreases, and expands as the deviation increases, thereby improving the control accuracy, where α(x) is a continuous function of the deviation variable e, strictly on [0,E] monotonous.

变论域模糊控制遵循一个基本原则:当偏差大或较大时,选择控制量以尽快消除偏差为主;当偏差较小时,选择控制量要注意防止超调,以保证系统的稳定性为主要出发点,基于该原则及专家经验得到以下变论域模糊控制规则表。The variable universe fuzzy control follows a basic principle: when the deviation is large or large, the selection of the control quantity should be based on eliminating the deviation as soon as possible; when the deviation is small, the selection of the control quantity should pay attention to prevent overshooting and ensure the stability of the system. Starting point, based on this principle and expert experience, the following variable domain fuzzy control rule table is obtained.

在变海拔变冷却流量实时控制中,控制单元ECU首先读取当前环境压力、温度和柴油机转速、负荷并通过冷却液温度标定MAP得到当前状态下最佳冷却液温度,根据比例溢流阀开度、冷却水泵转速和节温器开度标定MAP调节冷却流量,由反馈冷却液温度偏差及其变化率信号,变论域模糊控制器将电信号转换为模拟信号至执行器,实时调节冷却强度,具体控制流程如图3所示,达到冷却风扇、冷却水泵、节温器协同控制的目的,从而降低柴油机冷却系统寄生损失,实现在0~5500m变海拔环境条件下,柴油机冷却系统冷却强度的实时最优控制。In the real-time control of variable altitude and variable cooling flow, the control unit ECU first reads the current ambient pressure, temperature, diesel engine speed and load, and obtains the best coolant temperature under the current state through the coolant temperature calibration MAP, according to the proportional overflow valve opening , Cooling water pump speed and thermostat opening calibration MAP to adjust the cooling flow, feedback the coolant temperature deviation and its rate of change signal, the variable domain fuzzy controller converts the electrical signal into an analog signal to the actuator, and adjusts the cooling intensity in real time. The specific control process is shown in Figure 3, to achieve the purpose of cooperative control of cooling fan, cooling water pump, and thermostat, thereby reducing the parasitic loss of the diesel engine cooling system, and realizing real-time control of the cooling intensity of the diesel engine cooling system under the environmental conditions of variable altitudes from 0 to 5500m best 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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