EP1454039B1 - Verfahren zur temperaturregelung eines motors - Google Patents

Verfahren zur temperaturregelung eines motors Download PDF

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Publication number
EP1454039B1
EP1454039B1 EP02747231A EP02747231A EP1454039B1 EP 1454039 B1 EP1454039 B1 EP 1454039B1 EP 02747231 A EP02747231 A EP 02747231A EP 02747231 A EP02747231 A EP 02747231A EP 1454039 B1 EP1454039 B1 EP 1454039B1
Authority
EP
European Patent Office
Prior art keywords
coolant
temperature
engine
pump
loop
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02747231A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1454039A1 (de
Inventor
Roland Herynek
Martin Vollmer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1454039A1 publication Critical patent/EP1454039A1/de
Application granted granted Critical
Publication of EP1454039B1 publication Critical patent/EP1454039B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/14—Indicating devices; Other safety devices
    • F01P11/16—Indicating devices; Other safety devices concerning coolant 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
    • 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
    • F01P2023/00—Signal processing; Details thereof
    • 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
    • F01P2025/06—Pressure for determining flow
    • 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
    • F01P2025/30—Engine incoming fluid 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
    • F01P2025/08—Temperature
    • F01P2025/32—Engine outcoming fluid 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
    • F01P2025/08—Temperature
    • F01P2025/46—Engine parts temperature

Definitions

  • the invention relates to a method for controlling the temperature of an engine, in particular an internal combustion engine of a motor vehicle, according to the preamble of the main claim.
  • the coolant temperature can be measured by a temperature sensor in the cooling circuit is arranged and detects the current, present temperature of the cooling water and forwards, for example, to a control unit. This control monitors the temperature of the coolant and compares this with a maximum permissible temperature for the coolant or for the coolant flowing through the engine, which must not be exceeded during operation.
  • a device and a method for cooling an internal combustion engine is known in which a first temperature sensor detects the temperature of the coolant outlet of the cylinder head. Furthermore, the method of the EP 0 442 489 A1 another temperature sensor, which is mounted directly on the engine block and which serves to determine the engine oil temperature. When the engine oil temperature rises above a set value, the coolant flow passing through the engine is divided into two different branches. The first branch of the coolant flow continues to flow through the cylinder head, whereas the second remaining part of the coolant flow flows through the cylinder block.
  • the coolant volume flow through the cylinder block can be regulated according to the engine oil temperature in the cylinder block.
  • the EP 0 894 953 A1 discloses a cooling system for the internal combustion engine of a motor vehicle having a plurality of sensors which measure a corresponding number of parameters of the engine during operation.
  • the cooling system of the EP 0 894 953 A1 in particular three temperature sensors, which are mounted on the one hand in the cylinder head cooling circuit, on the other hand in the engine block cooling circuit and finally at the outlet of the cylinder head cooling circuit. These sensors each detect a temperature of the motor housing and pass the corresponding signals to a central, electronic control unit of the cooling circuit.
  • the central control unit of the cooling system controls based on the different sensor signals different, located in the cooling circuit components of the cooling system, such as a cooling air blower, a coolant pump or a throttle or bypass valve.
  • a disadvantage of the in the EP 0 894 953 A1 disclosed cooling system for the internal combustion engine of a motor vehicle is the fact that for the determination of the engine temperature, a plurality of sensors, in particular temperature sensors, must be used. These sensors are very susceptible to malfunction or total failure of their function due to the high mechanical and thermal stress in the engine compartment of a motor vehicle.
  • the use of a large number of sensors means a not inconsiderable cost factor and the significant increase in the complexity of the cooling system or its regulation.
  • a cooling system for an internal combustion engine is known in which the number of sensors compared to previously known systems could be reduced by a temperature of the internal combustion engine is determined based on a measured coolant temperature and a volume flow of the coolant through the internal combustion engine.
  • the inventive method for controlling the temperature of an engine with the characterizing features of the main claim has the advantage that the number of sensors used in the cooling system can be reduced to a minimum.
  • the engine temperature or the temperature of individual components of the engine by the coolant temperature and the flow rate of the coolant, by the engine or individual components of the engine is passed, determine.
  • the engine temperature or the temperature of individual components of the engine by the coolant temperature and the flow rate of the coolant, by the engine or individual components of the engine is passed, determine.
  • the engine temperature or the temperature of individual components of the engine by the coolant temperature and the flow rate of the coolant, by the engine or individual components of the engine is passed, determine.
  • the constant diagnosis of the engine temperature that the thermally sensitive parts of the engine are not damaged.
  • the value required for determining the component temperature of the motor for the volume flow of the coolant is determined from the electrical current required by the circulation pump of the coolant or from the electrical voltage present across the circulation pump.
  • An electric pump for circulating the coolant in the cooling circuit will promote a constant volume flow in steady state at a constant electrical voltage U, constant electric current I and a speed N of the pump.
  • the operating point of the pump that is to say the pressure increase ⁇ p, and the volume flow ⁇ V / ⁇ t can be determined on the basis of the known pump characteristics and the known flow resistance of the cooling circuit from the knowledge of the above values (U, I, N).
  • a numerical model of the cooling circuit with its individual components, in particular the engine or a thermal model of the engine, the hose guide with the associated flow resistance, the position of the valves, and other, the cooling circuit descriptive parameter is stored in a belonging to the cooling circuit controller ,
  • the control unit thus has a model or a rating which models the influence or the maximum permissible deviations of the coolant volume flow on the component temperature.
  • the inventive method uses a second manipulated variable or a second correction signal to ensure that the cooling capacity of the cooling circuit in an optimal range for the engine is working.
  • This second correction signal can be generated directly from the coolant temperature.
  • the coolant temperature is detected for example via a temperature sensor and compared the temporal change in the temperature of the coolant with a stored in the control unit, time-dependent model for the development of the coolant temperature.
  • This in the control unit stored, time-dependent model for the coolant temperature for example, be a mathematical model of the development of the coolant temperature at cold start of the motor vehicle or simulate other typical driving situations.
  • the theoretical model makes it possible to detect whether the coolant temperature of the cooling circuit increases in the "correct dimensions".
  • an optimal temperature bandwidth for the engine - depending on the particular driving situation - be stored in the control unit.
  • a second correction signal is then generated.
  • the control or regulation of the cooling circuit by this second control variable may be superimposed on the corresponding control of the volume flow, so that this second control can be used as an additional security control for the cooling circuit.
  • the delivery rate of the circulation pump that is, in particular their speed can be varied according to the generated correction signals. So it is possible to vary the coolant flow rate, and thus the engine temperature, as needed.
  • the valves arranged in the cooling circuit and further, the cooling circuit associated components, such as a cooling air blower for the radiator of the cooling circuit according to the generated correction signals can be controlled by the control unit as needed, so that at any time, one of optimal driving situation adapted coolant volume flow or an optimized coolant temperature in the cooling circuit is present.
  • the inventive method also allows the control unit can regulate the cooling capacity of the cooling circuit and in particular the coolant volume flow through the engine, taking into account further operating parameters of the vehicle.
  • the control unit can regulate the cooling capacity of the cooling circuit and in particular the coolant volume flow through the engine, taking into account further operating parameters of the vehicle.
  • a pollutant sensor can forward a corresponding signal to the control unit of the cooling circuit, so that the controller performs an optimized configuration for the active control elements of the cooling circuit to achieve minimum pollutant emissions due to an optimized engine temperature.
  • a model or a rating in the form of a characteristic diagram or a database is provided which describes the influence of the coolant volume flow on the pollutant emission of the vehicle.
  • Deviations from the calculated or previously stored in the control unit values of the engine parameters can not only be diagnosed by the control unit but also actively corrected.
  • the driver can be informed by appropriate delusions about the deviations in the cooling system.
  • the "Onboard Diagnosis” also makes it possible to detect faults or defects in the cooling system, such as blocked valves, crushed connecting lines or defective pumps.
  • the control of the active components of the cooling circuit controller may be advantageously an engine control unit.
  • FIG. 1 shows, in a simplified, schematic illustration, an engine compartment 10 of a vehicle in which an internal combustion engine 12 and a cooling circuit 14 for this internal combustion engine 12 are located.
  • the waste heat of the internal combustion engine 12 is preferably discharged to the outside via the cooling circuit 14, which forms a cooling system.
  • the cooling circuit has for this purpose a cooler 16 which is arranged in the cooling air flow 18 of the moving vehicle.
  • the cooling air flow 18, and thus indirectly the cooling capacity the cooling system can be controlled via louvers 20 which are mounted in the body 22 of the vehicle.
  • the cooling capacity of the cooling circuit results from the present temperature of the coolant and the circulating in the cooling system coolant flow.
  • the louvers 20 or additional, further louvers may also be disposed between the radiator 16 and the fan 24.
  • the cooling system For circulating a coolant 30 through the connecting lines 32 of the cooling system, the cooling system has an electric coolant pump 34.
  • the coolant used is preferably water, which can be admixed with a corresponding cold protection for low temperatures.
  • the coolant 30 is supplied from the radiator 16 through the coolant pump 34 and a flow line 35 to the motor 12.
  • To determine the coolant temperature is located in the region of a coolant inlet 36 of the engine 12, a temperature sensor 38 in the cooling circuit.
  • the coolant 30 flows through the motor 12 in ways not shown in Figure 1, wherein it receives a certain amount of heat from the engine 12, in order to then leave this again through a coolant outlet 40.
  • the internal combustion engine 12 in the embodiment of Figure 1 a second coolant outlet 50, via which a portion of the heated coolant to a heat exchanger, for example, for the interior of the motor vehicle, can be supplied.
  • the coolant outlet 40 of the engine 12 there is another, second temperature sensor 42, which detects the temperature of the coolant 30 after it leaves the engine 12.
  • the coolant 30 passes via a return line 44 back to the radiator 16 of the cooling circuit.
  • a valve 46 is provided, which allows the coolant to bypass the cooler 16 via a bypass line 48.
  • the active components of the cooling system are by means of a controller 52 which a memory 54, a processing block 66 and a comparison element 68 has been set or regulated via data lines 56 in such a way that the motor 12 of the vehicle has an optimum temperature at any time of a drive cycle or having temperature distribution.
  • This optimum temperature can for example be characterized by the lowest possible fuel consumption or the lowest possible pollutant emission of the engine.
  • a pollutant sensor 72 is provided, which is likewise connected to the control unit 52 via a data line 74.
  • the method according to the invention for controlling the temperature of an engine is explained in more detail below with reference to a block diagram in FIG.
  • the active, adjustable components of the cooling system such as the louvers 20, the fan 24, the coolant pump 34, the bypass valve 46 and other not explicitly defined in the embodiment components 60 of the cooling circuit via signal lines 56, which also allow the electrical power supply of these adjustable components connected to the controller 52.
  • the other components 60 of the cooling circuit may be, for example, additional, adjustable valves or also an additional coolant pump.
  • the temperature sensors 38 and 42 for determining the coolant temperature are also connected via corresponding data lines 58 to the control unit 52. .
  • the electric coolant pump 34 has a power supply 62, which may be coupled, for example via the control unit 52 to the electrical system of the vehicle.
  • the control unit 52 detects the operating point of the coolant pump 34, that is, the volume flow delivered by the pump - in the embodiment of Figure 2 - based on the required by the electric pump electric current I from the power supply. This signal is also supplied to the control unit 52 via a data line 64.
  • the control unit 52 calculates from the currently present actual parameters of the cooling circuit, such as the current, detected coolant temperature or required by the coolant pump 34 electrical current I the circulating in the cooling circuit coolant flow and from the engine temperature and the temperatures of various engine components.
  • Deposited in the memory 54 of the control unit 52 is a thermal model of the cooling circuit with its components, such as the connection guide, the viscosity change of the coolant, the position of the valves, the cooling capacity of the radiator 16 and the fan 24 and other, the cooling system descriptive parameters.
  • the control unit 52 thus has a rating that models the influence of a specific coolant volume flow on the engine temperature or on the temperature of various components of the engine.
  • the electric pump 34 will promote a steady flow in steady state operation. This is done at a constant electrical voltage U, constant electric current I and a predetermined speed N of the pump.
  • the respective operating point of the pump that is to say the pressure build-up ⁇ P and the volume flow ⁇ V / ⁇ t can thus be determined by the control unit via the pump characteristics and the stored flow resistances of the cooling circuit from the knowledge of the values of electrical voltage U, electric current I and rotational speed N of the pump become.
  • the control unit for example, from the measurement of the electric current I, the pump pulls at a constant drive by a constant voltage U and at constant speed N, on the Close the volume flow delivered by the pump.
  • the required electric current I of the coolant pump can thus be used to evaluate and diagnose the pumped by the pump 34 coolant flow.
  • the volume flow of the coolant diagnosed in this way via the electric current of the pump 34 is used by the control unit together with the coolant temperature determined, for example, via the temperature sensor 42 in order to calculate the current engine temperature.
  • the correction signal is used to control the active elements of the cooling circuit, such as the coolant pump 34, the cooling air blower 24, the bypass valve 46 or the louvers 20 or regulate.
  • the coolant pump 34 the coolant volume flow through the engine 12 can be adjusted and an optimization of the temperature of the engine or of the temperatures of various engine components with respect to fuel consumption and / or pollutant emission can be achieved.
  • control unit 52 also supplies an actuating and control signal to the bypass valve 46, which can adjust the temperature of the coolant at the coolant inlet 36 to the desired value by opening or closing the bypass line 48.
  • the temperature sensor 38, the coolant temperature in front of the coolant inlet 36 of the engine 12 determine and forward this signal to the controller 52. In this way, it is possible to detect a defective component of the cooling circuit, should this thermally not follow the specifications of the controller 52 and the controller stored in the thermal model.
  • the temporal change in the temperature of the coolant in the starting phase of the internal combustion engine with a stored in the control unit, time-dependent model of the coolant temperature for this phase can be compared. If the actual temperature values deviate from the predefined setpoint temperature values, which may be stored in the memory 54 of the control unit 52, for example in the form of a temperature range, the control unit 52 additionally issues a corresponding warning signal which indicates a malfunction of the cooling circuit and thus an eventual malfunction present defective component indicates.
  • control unit also has, for example, corresponding pollutant sensors 72 which detect the current pollutant emission of the internal combustion engine and report it via a connection 74 to the processing block 66 of the control unit 52.
  • the pollutant sensors 72 thus also make it possible, by comparison 68 with corresponding data stored in the memory 54 of the control unit, to adjust the engine temperature to its respectively optimum value.
  • the inventive method is not limited to the described embodiment.
  • the present engine temperature or the component temperature of the engine can be diagnosed indirectly via other characteristics of the coolant pump. If at constant control, that is, at a constant voltage U, the pump always "pulls" a constant electric current I, then it can be concluded from the speed N of the pump on the load and thus on the delivered volume flow. With the help of the thus detected volume flow and the measured coolant temperature can then be inferred in turn to a component temperature of the engine.
  • the respective other parameters (U, N) of the coolant pump must be detected and processed by the control unit 52.
  • the measured variables (U, I, N) are currently evaluated by the control unit 52 and compared there with the calculated model and the stored characteristic curves of the pump. Deviations from the calculated or previously stored in the control unit data thus allow detection of errors in the cooling system, for example by blocked valves, defective lines, or even a non-functional coolant pump.

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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)
EP02747231A 2001-09-08 2002-06-20 Verfahren zur temperaturregelung eines motors Expired - Lifetime EP1454039B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10144275 2001-09-08
DE10144275A DE10144275A1 (de) 2001-09-08 2001-09-08 Verfahren zur Temperaturregelung eines Motors
PCT/DE2002/002254 WO2003027456A1 (de) 2001-09-08 2002-06-20 Verfahren zur temperaturregelung eines motors

Publications (2)

Publication Number Publication Date
EP1454039A1 EP1454039A1 (de) 2004-09-08
EP1454039B1 true EP1454039B1 (de) 2008-01-23

Family

ID=7698319

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02747231A Expired - Lifetime EP1454039B1 (de) 2001-09-08 2002-06-20 Verfahren zur temperaturregelung eines motors

Country Status (5)

Country Link
US (1) US20040011304A1 (ja)
EP (1) EP1454039B1 (ja)
JP (1) JP2005504209A (ja)
DE (2) DE10144275A1 (ja)
WO (1) WO2003027456A1 (ja)

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WO2021218550A1 (zh) * 2020-04-28 2021-11-04 博鼎汽车科技(山东)有限公司 一种应用电子温控阀的发动机热管理系统及其实现方法
DE102020206513A1 (de) 2020-05-26 2021-12-02 Zf Friedrichshafen Ag Verfahren zum Betrieb einer Pumpenantriebseinheit

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DE102006009892A1 (de) * 2006-03-03 2007-09-06 Audi Ag Steuervorrichtung zum Steuern der Kühlmitteltemperatur eines Verbrennungsmotors eines Kraftfahrzeugs sowie Verbrennungsmotor mit einer solchen Steuervorrichtung
DE102007000373A1 (de) * 2007-07-11 2009-01-15 Hilti Aktiengesellschaft Brennkraftbetriebenes Setzgerät
DE102008011225A1 (de) * 2008-02-26 2009-08-27 Robert Bosch Gmbh Diagnoseverfahren und Antriebssteuerung
US8215283B2 (en) * 2009-04-06 2012-07-10 Honda Motor Co., Ltd. Cooling system for variable cylinder engines
JP2011088268A (ja) * 2009-10-26 2011-05-06 Fanuc Ltd ファンモータを有する工作機械用モータ駆動装置
US9447765B2 (en) * 2011-07-11 2016-09-20 Ford Global Technologies, Llc Powertrain delta current estimation method
CN104364489B (zh) * 2012-06-18 2017-02-22 丰田自动车株式会社 粘度测定装置
KR101406504B1 (ko) * 2013-05-15 2014-06-13 기아자동차주식회사 차량의 냉각수부족 진단방법 및 시스템
DE102013216627A1 (de) * 2013-08-22 2015-02-26 Robert Bosch Gmbh Drehzahlvariable Fluid-Kühl-Filter-Anordnung
CN104691457A (zh) * 2013-12-09 2015-06-10 福特全球技术公司 车辆
US9523306B2 (en) * 2014-05-13 2016-12-20 International Engine Intellectual Property Company, Llc. Engine cooling fan control strategy
JP6079759B2 (ja) 2014-12-01 2017-02-15 トヨタ自動車株式会社 エンジン冷却システムの孔詰まり判定装置及び方法
US9752492B2 (en) * 2015-03-06 2017-09-05 Deere & Company Fan control system and method
AT518199B1 (de) * 2016-01-18 2017-11-15 Secop Gmbh Verfahren zur Detektion eines blockierten Ventils eines Kältemittelkompressors und ein Steuerungssystem für einen Kältemittelkompressor
US10605151B2 (en) * 2016-06-09 2020-03-31 GM Global Technology Operations LLC Electric pump operating strategy
DE102017209484B4 (de) * 2017-06-06 2022-05-12 Vitesco Technologies GmbH Kühlvorrichtung, Kraftfahrzeug und Verfahren zum Betreiben einer Kühlvorrichtung
CN114542263B (zh) * 2022-03-22 2023-04-18 潍柴动力股份有限公司 一种冷却水温度调控方法及控制系统

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021218550A1 (zh) * 2020-04-28 2021-11-04 博鼎汽车科技(山东)有限公司 一种应用电子温控阀的发动机热管理系统及其实现方法
DE102020206513A1 (de) 2020-05-26 2021-12-02 Zf Friedrichshafen Ag Verfahren zum Betrieb einer Pumpenantriebseinheit

Also Published As

Publication number Publication date
DE50211623D1 (de) 2008-03-13
EP1454039A1 (de) 2004-09-08
DE10144275A1 (de) 2003-03-27
US20040011304A1 (en) 2004-01-22
WO2003027456A1 (de) 2003-04-03
JP2005504209A (ja) 2005-02-10

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