CN105804852A - Novel internal combustion engine cooling system and control method thereof - Google Patents
Novel internal combustion engine cooling system and control method thereof Download PDFInfo
- Publication number
- CN105804852A CN105804852A CN201610234867.2A CN201610234867A CN105804852A CN 105804852 A CN105804852 A CN 105804852A CN 201610234867 A CN201610234867 A CN 201610234867A CN 105804852 A CN105804852 A CN 105804852A
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- Prior art keywords
- temperature
- thermophore
- combustion engine
- threshold value
- thermostat
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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
- F01P3/00—Liquid cooling
- F01P3/20—Cooling circuits not specific to a single part of engine or machine
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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
- F01P7/10—Controlling of coolant flow the coolant being cooling-air by throttling amount of air flowing through liquid-to-air heat exchangers
- F01P7/12—Controlling of coolant flow the coolant being cooling-air by throttling amount of air flowing through liquid-to-air heat exchangers 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
- F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
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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
- F01P7/167—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N19/00—Starting aids for combustion engines, not otherwise provided for
- F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
- F02N19/04—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines
- F02N19/10—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines by heating of engine coolants
-
- 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
- F01P2007/146—Controlling of coolant flow the coolant being liquid using valves
-
- 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
Abstract
The invention relates to the technical field of heat management of engineering machinery and internal combustion engines for vehicles, in particular to a novel internal combustion engine cooling system and a control method thereof. The cooling liquid temperature control of an internal combustion engine is an important optimal heat management content about performance, and has higher technical difficulty under the condition of large-range variable working conditions and variable environment factors. A three-way valve is arranged behind a radiator; one way of outlet directly flows to an engine; another way of outlet flows to the engine by a heat accumulator; and the two ways of cooling liquid flowing to the engine are merged with small circulating cooling liquid from a thermostat to enter the engine. The control method comprises control policies of the three-way valve, a fan, the thermostat and the like, and further comprises auxiliary heating control in cold starting. Through optical control of inner wall surface temperature of a cylinder, the engine satisfies the requirements of optimal heat management in a wide range under the large-range variable working conditions, so that the oil consumption is saved, the emission is reduced, the superheating is prevented, and the wear is reduced.
Description
Technical field
The present invention relates to internal combustion engine thermal management technology field, including construction equipment engine and Vehicular internal combustion engine, particularly relate to a kind of novel cooling system and control method.
Background technology
The performance of internal combustion engine is had extremely important meaning by cooling liquid of IC engine temperature.Too low coolant temperature can cause that radiation loss increases, and oil consumption raises；In cylinder, piece surface temperature is too low, and hydrocarbon particulate emission, smoke intensity increase；Parts depreciation increases etc. endanger.And too high coolant temperature, cause that piece surface temperature raises so that discharged nitrous oxides increases, electromotor volumetric efficiency declines and causes that power drop, part Cracking Failure etc. endanger.So coolant temperature controls, it it is the important heat management content improving engine life, reduction oil consumption, reduction discharge.
But there are technological difficulties in engine thermal management technique, the conventional traditional cooling system adopted and control program thereof at present, it is difficult to, under electromotor variable working condition, change speed, changing environment temperature conditions, coolant temperature is carried out optimal control timely and effectively.
Change according to engine operating condition, adopts different coolant temperatures to cool down, and electromotor can be made when variable working condition to be in excellent service behaviour state all the time, is also one of the developing direction of present engine thermal management technology.Current technology path mainly adopts electric-controlled thermostat, electric control pump, automatically controlled (or multistage clutch) fan etc..But control strategy constitutes one of Major Difficulties；And in electromotor Fast variable operating condition situation, coolant temperature is due to thermal inertia and hysteresis characteristic, it is impossible to timely respond to also become technological difficulties.So the design temperature of actual coolant, can not change timely in a big way with operating mode and ambient condition, limit the further optimization of engine performance.
Not enough for existing engine thermal management technique, the technological thought of the present invention: engine low load adopts high coolant temperature when running, low coolant temperature is adopted during heavy-duty service, auxiliary equipment when adopting thermophore as load switching, make coolant temperature can quickly load-responsive change requirement, by optimal control cylinder inner wall surface temperature, make electromotor when variable working condition on a large scale, meeting the requirement optimizing heat management on a large scale, fuel-economizing consumes, reduction of discharging is put, it is overheated to prevent, drop abrasion.
1, during underload, coolant temperature is compared existing conventional art and is had and significantly raise, and improves cylinder temperature, and during underload, burning is improved, and oil consumption, discharge reduce.
2, variable working condition coolant mean temperature raises, and engine radiating loss reduces, and oil consumption reduces.
3, the existing conventional art of employing is compared, under big loading condiction, in cylinder, part maximum temperature slightly declines as design and controls target, so can so that charging efficiency slightly rises (power raisings) during big load, discharged nitrous oxides minimizing, part will not be overheated.Due to the strategy that piece surface temperature when adopting big load is controlled, the issuable piece surface temperature overheating phenomenon of prior art more can be got rid of.
4, new cooling system framework and supporting control strategy thereof, electromotor can be made to change under the impact of the complicated factor such as (automobile-used machine), variation of ambient temperature, load variations at face velocity, remain to cold night liquid temp, cylinder wall surface temperature optimal control.
5, on above-mentioned cooling system physical structure basis, tap the potential energy, independent cold start-up operational mode is set, utilize the heat stored by thermophore, cylinder Part temperature is made to be climbed to normal working temperature, shortening cold car and run the time, minimizing abrasion, raising service life of aeroengine, reduction start fuel oil consumption and granular material discharged.
Summary of the invention
1, shown in Fig. 1, one three-way valve is set after engine radiator, one way outlet of this three-way valve flows directly into electromotor, another way outlet connects a thermophore, accumulator outlet coolant flow direction engine, the coolant of above two-way flow direction engine and the partial circulating coolant from thermostat are converged, and enter back into electromotor.
2, invention also includes the control strategy to three-way valve, fan, thermostat etc..
3, auxiliary computer heating control when also including engine cold-start is invented.
Accompanying drawing explanation
Fig. 1: the structure principle chart described in foregoing invention content 1.
Fig. 2: simulation result analysis.Upper figure is that prior paraffin thermostat carries out coolant temperature control；Figure below is that the thermal management technology adopting the present invention is controlled.During visible employing the technology of the present invention, busy hour (external characteristics), cylinder inner wall exemplary position temperature (representatively, slightly declines without loss of generality), and during underrun, temperature is significantly raised.
Fig. 3: simulation result analysis.Upper figure represents in same design con-trol target (cylinder inner wall exemplary position temperature) situation, does not adopt thermophore, controls the temperature variations of target；Situation when figure below is for complete employing thermal management technology of the present invention (comprising thermophore).As seen from the figure, when not adopting thermophore, when load rises rapidly to close to full load, due to the response thermal inertia of cooling system, the factor such as delayed, control object can produce obvious superheating phenomenon.This simulation calculates and is used for relatively some other thermal management technology (such as electric-controlled thermostat control coolant temperature), important difference with the present invention: adopt thermophore in the present invention, and the thermophore design of key, connection and fortune control form, it is possible to it is fully achieved default control target.In other words, compared to the key technology of the present invention, the technology path of (not adopting thermophore) shown in upper figure, it has to adopting less coolant temperature as design parameter, to prevent engine overheat, optimization range is restricted.Reflect one of key technology of the present invention Core Superiority Comparatively speaking.
Fig. 4: simulation result analysis.Advantage when this accompanying drawing shows the thermophore being previously mentioned in present invention explanation for engine cold-start.Upper figure adopts existing routine techniques, and when controlling cold start-up with paraffin thermostat, large and small circulation carries out temperature controlled process.Figure below is the thermal management technology of the present invention situation when cold start-up.Comparing calculation analyzes result, it is seen that the technology of the present invention within the time of much shorter, can make engine cylinder temperature be increased to normal working temperature.Parts depreciation when decreasing cold start-up, oil consumption, smoke intensity etc..
Specific implementation method:
1, after engine radiator, one three-way valve is set, one way outlet of this three-way valve is directly to electromotor, another way outlet connects a thermophore, accumulator outlet coolant flow direction engine, the coolant of above two-way flow direction engine and the partial circulating coolant from thermostat are converged, then flow into electromotor.
2, thermophore is the high-power phase change heat accumulator of transient state, and phase transition temperature is different with purposes according to type of internal combustion engine, is designed as between 75～100 DEG C (such as 90 DEG C), thermophore during the course rapidly (100～101Number of seconds magnitude) absorb heat and heat release.
3, after radiator, a three-way valve is set before thermophore, is used for radiator outlet coolant being directly entered internal combustion engine or entering back into internal combustion engine the two path by thermophore switching over control.
4, by experiment each rotating speed of electromotor is obtained one and optimizes load, as threshold value set in advance, when electromotor is by when setting the underload of below threshold value to more than threshold value high load capacity variable working condition, by the action of three-way valve, short time incision thermophore, for quickly lowering the temperature to coolant；When electromotor is by when setting the high load capacity of more than threshold value to underload variable working condition below threshold value, by the action of three-way valve, short time incision thermophore, utilize cooling capacity affluence at this moment that thermophore is lowered the temperature (cooling capacity regeneration).
5, when electromotor is by when setting the underload of below threshold value to more than threshold value high load capacity variable working condition, the method adopting machinery or circuit realiration, blower fan shift temperature (or temperature control curve) is made when comparing underload, to deduct downwards an offset value, so that blower fan is got involved earlier；When electromotor is by when setting the high load capacity of more than threshold value to underload variable working condition below threshold value, the method adopting machinery or circuit realiration, blower fan shift temperature (or temperature control curve) is made upwards to add an offset value when comparing high load capacity, so that the more late intervention of blower fan.
6, optimization temperature requirement to coolant when thermostat standard-sized sheet temperature is according to underload, it is set in higher value, when electromotor is by when setting the underload of below threshold value to more than threshold value high load capacity variable working condition, control action makes the controlled coolant temperature that the temperature acting on thermostat obtains than sensing increase an offset value, so that thermostat increases aperture, strengthen cooling；When electromotor is by when setting the high load capacity of more than threshold value to underload variable working condition below threshold value, removes above-mentioned control side-play amount, make the controlled coolant temperature that the temperature acting on thermostat obtains equal to sensing, so that the coolant temperature that thermostat controls raises.
7, when engine cold-start, control the aperture of thermostat, it is made to have big aperture at short notice, control three-way valve simultaneously, so that coolant flows quickly through thermophore, utilize the heat auxiliary warming-up of thermophore, thermostat aperture is in this warming-up supporting process, from large to small, until close to partial circulating (conventional cold start state), auxiliary warming-up process terminates.
Claims (8)
1. the thermal management technology of an internal-combustion engine cooling system, including being arranged at the three-way valve after cooling water radiator, thermophore and adapter, control method: after engine radiator, one three-way valve is set, one way outlet of this three-way valve is directly to electromotor, another way outlet connects a thermophore, accumulator outlet coolant flow direction engine, and the coolant of above two-way flow direction engine and the partial circulating coolant from thermostat are converged, flow into electromotor again, be further characterized in that control method.
2. the thermal management technology of internal-combustion engine cooling system as claimed in claim 1, it is characterized in that: described thermophore is the high-power phase change heat accumulator of transient state, phase transition temperature is different with purposes according to type of internal combustion engine, is designed as between 75～100 DEG C, thermophore during the course rapidly (100～101Number of seconds magnitude) absorb heat and heat release.
3. the thermal management technology of internal-combustion engine cooling system as claimed in claim 1, it is characterized in that: the three-way valve after being arranged at radiator, before thermophore, be used for radiator outlet coolant being directly entered internal combustion engine or entering back into internal combustion engine the two path by thermophore switching over control.
4. internal-combustion engine cooling system as claimed in claim 1 the three-way valve control method of thermal management technology, it is characterized in that: by experiment each rotating speed of electromotor is obtained one and optimizes load, as threshold value set in advance, when electromotor is by when setting the underload of below threshold value to more than threshold value high load capacity variable working condition, by the action of three-way valve, short time incision thermophore, for quickly lowering the temperature to coolant.
5. internal-combustion engine cooling system as claimed in claim 1 the three-way valve control method of thermal management technology, it is characterized in that: when electromotor is by when setting the high load capacity of more than threshold value to underload variable working condition below threshold value, by the action of three-way valve, short time incision thermophore, utilizes cooling capacity affluence at this moment that thermophore is lowered the temperature (cooling capacity regeneration).
6. internal-combustion engine cooling system as claimed in claim 1 the blower control method of thermal management technology, it is characterized in that: when electromotor is by when setting the underload of below threshold value to more than threshold value high load capacity variable working condition, the method adopting machinery or circuit realiration, blower fan shift temperature (or temperature control curve) is made when comparing underload, to deduct downwards an offset value, so that blower fan is got involved earlier；When electromotor is by when setting the high load capacity of more than threshold value to underload variable working condition below threshold value, the method adopting machinery or circuit realiration, blower fan shift temperature (or temperature control curve) is made upwards to add an offset value when comparing high load capacity, so that the more late intervention of blower fan.
7. the thermostat control method of the thermal management technology of internal-combustion engine cooling system as claimed in claim 1, it is characterized in that: optimization temperature requirement to coolant when thermostat standard-sized sheet temperature is according to underload, it is set in higher value, when electromotor is by when setting the underload of below threshold value to more than threshold value high load capacity variable working condition, control action makes the controlled coolant temperature that the temperature acting on thermostat obtains than sensing increase an offset value, so that thermostat increases aperture, strengthen cooling；When electromotor is by when setting the high load capacity of more than threshold value to underload variable working condition below threshold value, removes above-mentioned control side-play amount, make the controlled coolant temperature that the temperature acting on thermostat obtains equal to sensing, so that the coolant temperature that thermostat controls raises.
8. the control method of the thermal management technology of internal-combustion engine cooling system as claimed in claim 1, it is characterized in that: when thermophore is for the auxiliary warming-up of engine cold-start process, control the aperture of thermostat, it is made to have big aperture at short notice, control three-way valve simultaneously, so that coolant flows quickly through thermophore, utilize the heat auxiliary warming-up of thermophore, thermostat aperture is in this warming-up supporting process, from large to small, until close to partial circulating (conventional cold start state), auxiliary warming-up process terminates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610234867.2A CN105804852A (en) | 2016-04-15 | 2016-04-15 | Novel internal combustion engine cooling system and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610234867.2A CN105804852A (en) | 2016-04-15 | 2016-04-15 | Novel internal combustion engine cooling system and control method thereof |
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| CN105804852A true CN105804852A (en) | 2016-07-27 |
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| CN201610234867.2A Pending CN105804852A (en) | 2016-04-15 | 2016-04-15 | Novel internal combustion engine cooling system and control method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109209612A (en) * | 2018-09-20 | 2019-01-15 | 中汽动力（沈阳）有限公司 | Water tank, engine-cooling system and its control method and vehicle of vehicle |
| CN109595065A (en) * | 2019-01-15 | 2019-04-09 | 上海汽车集团股份有限公司 | The quick heat engine cooling system of automobile engine |
| CN115217609A (en) * | 2022-06-06 | 2022-10-21 | 广州汽车集团股份有限公司 | Engine thermal management control method and device, electronic equipment and storage medium |
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| CN115217609B (en) * | 2022-06-06 | 2023-07-14 | 广州汽车集团股份有限公司 | Engine thermal management control method and device, electronic equipment and storage medium |
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