CN114593000A - Vehicle heat cycle system, and engine preheating method and device - Google Patents
Vehicle heat cycle system, and engine preheating method and device Download PDFInfo
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- CN114593000A CN114593000A CN202210263880.6A CN202210263880A CN114593000A CN 114593000 A CN114593000 A CN 114593000A CN 202210263880 A CN202210263880 A CN 202210263880A CN 114593000 A CN114593000 A CN 114593000A
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000000110 cooling liquid Substances 0.000 claims abstract description 15
- 239000002826 coolant Substances 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 230000017525 heat dissipation Effects 0.000 claims description 80
- 238000010438 heat treatment Methods 0.000 claims description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 230000004044 response Effects 0.000 claims description 9
- 238000010792 warming Methods 0.000 claims description 9
- 238000013507 mapping Methods 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims description 6
- 238000003860 storage Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000004422 calculation algorithm Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005382 thermal cycling Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
Abstract
The invention provides a heat cycle system for preheating a vehicle engine and an engine preheating method and device adopting the heat cycle system, wherein the heat cycle system comprises: the engine and the first radiator are connected through a pipeline of cooling liquid to form a first thermal cycle, and the first three-way valve, the second radiator, the second three-way valve and the plurality of high-pressure devices are sequentially connected end to end through the pipeline of the cooling liquid to form a second thermal cycle; the idle valve port of the first three-way valve is connected with a coolant inlet of the engine so as to introduce the cooling liquid in the second thermal cycle into the engine for preheating, and the idle valve port of the second three-way valve is connected with a coolant outlet of the engine so as to receive the liquid for preheating the engine and return to the second thermal cycle; the first three-way valve and the second three-way valve are connected with the PLC controller to control the opening degree of three valve ports on the two three-way valves.
Description
Technical Field
The invention relates to the field of vehicle thermal management, in particular to a thermal cycle system of a vehicle, and an engine preheating method and device.
Background
The starting working conditions of the engine of the vehicle are divided into cold starting and hot starting, wherein the cold starting is started under the condition that the temperature of the engine water is low, and generally occurs after the vehicle is kept still for a long time or is a long time away from the last starting. The loss of the cold start to the engine is very large, firstly, because the clearance of the machine parts is larger before the engine is not preheated, the lubricating oil sinks to the bottom of the oil, and at the moment, if the engine speed is increased by the oil boom, the temperature is rapidly increased, and the abrasion of the machine parts is increased. On the other hand, the cold start also can increase the exhaust emission to a certain extent, reduces emission quality, because in the process of cold start, because the engine water temperature is lower, the rotational speed is unstable, and automobile emission purifier does not reach the starting condition (for example, the temperature is 200 ℃ -300 ℃) this moment, can lead to that automobile exhaust emission exceeds standard. Therefore, the cold start of the engine is not beneficial to the service life of the engine and the environmental protection, and after long-time stop, the engine needs to be preheated in advance before starting.
With the increasing requirements of engine emission regulations and environmental protection, cold start of an engine is one of main factors for worsening emission, and optimization of cold start of the engine has important significance for optimizing engine emission.
In order to overcome the above defects in the prior art, there is an urgent need in the art for a vehicle heat cycle system and an engine preheating method, which are used for preheating a vehicle engine by using heat dissipation heat of vehicle high-voltage equipment, effectively avoiding cold start of the engine, balancing heating requirements of the engine and heat dissipation requirements of the equipment, and dynamically adjusting the opening degree of a valve port of a three-way valve in the heat cycle system to achieve the optimal heat cycle effect.
Disclosure of Invention
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
In order to overcome the above-mentioned drawbacks of the prior art, the present invention provides a heat cycle system for vehicle engine warm-up, comprising: the engine and the first radiator are connected through a pipeline of cooling liquid to form a first heat cycle, and the first three-way valve, the second radiator, the second three-way valve and the high-pressure equipment are sequentially connected end to end through the pipeline of the cooling liquid to form a second heat cycle; the idle valve port of the first three-way valve is connected with a coolant inlet of the engine so as to introduce the cooling liquid in the second thermal cycle into the engine for preheating, and the idle valve port of the second three-way valve is connected with a coolant outlet of the engine so as to receive the liquid for preheating the engine and return the liquid to the second thermal cycle; and the first three-way valve and the second three-way valve are connected with a PLC controller to control the opening degrees of three valve ports on the two three-way valves.
In one embodiment, the engine and the plurality of high-pressure devices are preferably provided with sensors, and the sensors are connected with the PLC controller to dynamically control the opening degrees of the valve ports of the two three-way valves according to the heating requirement of the engine and the heat dissipation requirements of the plurality of high-pressure devices.
In an embodiment, it is preferable that the vehicle further includes a vehicle ambient temperature sensor, and the vehicle ambient temperature sensor is connected to the PLC controller to dynamically control the opening of the valve ports of the two three-way valves according to the vehicle ambient temperature, the heating requirement of the engine, and the heat dissipation requirement of the plurality of high-pressure devices.
In one embodiment, a water pump is preferably further provided in the second thermal cycle for assisting the circulation of the cooling liquid in the second thermal cycle.
In an embodiment, optionally, the plurality of high voltage devices includes a generator, a driving motor, and a charger.
Another aspect of the present invention is a warm-up method of a vehicle engine employing the heat cycle system for warm-up of a vehicle engine according to claim 1, the warm-up method comprising: in response to the actual temperature of the engine meeting a preset temperature threshold, closing valve ports of the first three-way valve and the second three-way valve connected with the engine to stop preheating the engine; determining the heat dissipation requirement levels of the plurality of high-voltage devices, and closing a valve port of the first three-way valve connected with the second radiator to stop the second radiator from dissipating heat for the plurality of high-voltage devices in response to the heat dissipation requirement levels being lower than a preset level; and in response to the actual temperature of the engine not meeting the preset temperature threshold and the heat dissipation requirement levels of the plurality of high-voltage devices not being lower than the preset level, determining a heating requirement level of the engine, and dynamically controlling the opening degrees of the first three-way valve and the second three-way valve based on the heating requirement level of the engine and the heat dissipation requirement levels of the plurality of high-voltage devices.
In one embodiment, preferably, the dynamically controlling the opening degrees of the first three-way valve and the second three-way valve based on the heating demand level of the engine and the heat dissipation demand level of the plurality of high-pressure devices includes: determining a thermal cycle demand level of the thermal cycle system based on the heating demand level of the engine and the heat dissipation demand level of the plurality of high-voltage devices; and according to the thermal cycle demand grade, determining the valve port opening values of the first three-way valve and the second three-way valve by looking up a table, and representing the valve port opening values of the first three-way valve and the second three-way valve under different thermal cycle demand grades.
In one embodiment, preferably, the determining a heat cycle demand level of the heat cycle system based on the heating demand level of the engine and the heat dissipation demand level of the plurality of high voltage devices includes: determining a weighting factor of a heating demand level of the engine and a heat dissipation demand level of the plurality of high-voltage devices according to the vehicle ambient temperature; and weighting the heating demand level of the engine and the heat dissipation demand levels of the plurality of high-voltage devices by adopting the weight coefficient to obtain the thermal cycle demand level.
In one embodiment, preferably, the determining the heating demand level of the engine comprises: when the target temperature of the engine is higher than the actual temperature, calculating a ratio of a difference value of the target temperature and the actual temperature of the engine to the target temperature, and determining the heating demand level of the engine according to a mapping relation between the ratio value and the heating demand level of the engine; and when the target temperature of the engine is not higher than the actual temperature, the engine has no heating requirement.
In one embodiment, preferably, determining the heat dissipation requirement level of the plurality of high voltage devices comprises: when the actual temperature of a high-voltage device is higher than the target temperature, calculating a ratio of a difference value between the actual temperature and the target temperature of the high-voltage device to the target temperature, and determining the heat dissipation requirement grade of the high-voltage device according to a mapping relation between the ratio and the heat dissipation requirement grade of the high-voltage device; when the actual temperature of the high-voltage equipment is not higher than the target temperature, the high-voltage equipment has no heat dissipation requirement; and taking the maximum value of the heat dissipation requirement grades in the plurality of high-voltage devices as the heat dissipation requirement grades of the plurality of high-voltage devices.
The present invention also provides a preheating device of a vehicle engine, comprising: a memory; and a processor coupled to the memory, the processor configured to perform the steps of any of the above-described vehicle engine warm-up methods.
The invention also provides a computer-readable medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method for warming up a vehicle engine as described in any one of the preceding claims.
Drawings
The above features and advantages of the present disclosure will be better understood upon reading the detailed description of embodiments of the disclosure in conjunction with the following drawings. In the drawings, components are not necessarily drawn to scale, and components having similar relative characteristics or features may have the same or similar reference numerals.
FIG. 1 is a system diagram illustrating a thermal cycle system for vehicle engine warm-up according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a method for warming up an engine using a thermal cycle system according to another aspect of the present disclosure;
FIG. 3 is a graph illustrating a numerical correspondence between valve port openings of two three-way valves as a function of a thermal cycle demand level according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating a method of engine warm-up according to an embodiment of the present disclosure; and
fig. 5 is a schematic device structure diagram of a vehicle engine preheating device according to another aspect of the present invention.
For clarity, a brief description of the reference numerals is given below:
101 engine
102 first radiator
103 second heat sink
104 first three-way valve
1041 first valve port
1042 second valve port
1043 third valve
105 second three-way valve
1051 first valve port
1052 second valve port
1053 third valve
106 electric generator
107 driving motor
108 charger
109 first thermal cycle
110 second thermal cycle
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the invention will be described in connection with the preferred embodiments, there is no intent to limit the features of the invention to those embodiments. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Additionally, the terms "upper," "lower," "left," "right," "top," "bottom," "horizontal," "vertical" and the like as used in the following description are to be understood as referring to the segment and the associated drawings in the illustrated orientation. The relative terms are used for convenience of description only and do not imply that the described apparatus should be constructed or operated in a particular orientation and therefore should not be construed as limiting the invention.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, regions, layers and/or sections, these elements, regions, layers and/or sections should not be limited by these terms, but rather are used to distinguish one element, region, layer and/or section from another element, region, layer and/or section. Thus, a first component, region, layer or section discussed below could be termed a second component, region, layer or section without departing from some embodiments of the present invention.
In order to overcome the defects in the prior art, the invention provides a vehicle heat cycle system and an engine preheating method, which are used for preheating a vehicle engine by using heat dissipation of vehicle high-voltage equipment, effectively avoiding cold start of the engine, balancing the heating requirement of the engine and the heat dissipation requirement of the equipment, and dynamically adjusting the opening of a valve port of a three-way valve in the heat cycle system so as to achieve the optimal heat cycle effect.
Fig. 1 is a system configuration diagram of a heat cycle system for vehicle engine warm-up according to an embodiment of the present invention.
Referring to fig. 1, the present invention provides a heat cycle system for warming up a vehicle engine, including: an engine 101, a plurality of high-pressure devices, a first radiator 102, a second radiator 103, a first three-way valve 104, and a second three-way valve 105.
The engine 101 and the first radiator 102 are connected by a coolant line to form a first heat cycle 109. The first thermal cycle 109 is used for dissipating heat of the engine after the engine is started, and the first thermal cycle 109 closes small-cycle heat dissipation before the water temperature of the engine 101 does not exceed a certain threshold value, so that the engine 101 can quickly enter a warm-up state.
The first three-way valve 104, the second radiator 103, the second three-way valve 105 and the plurality of high-pressure devices are also connected end to end in sequence through a pipeline of the cooling liquid to form a second heat cycle 110. The second thermal cycle 110 functions primarily to radiate heat generated by the plurality of high voltage devices into the air by heat dissipation through the heat sink.
In one embodiment, as shown in fig. 1, the plurality of high voltage devices includes a generator 106, a driving motor 107, and a charger 108. These high voltage devices generate heat before the vehicle is started, thereby having a heat dissipation requirement.
In an embodiment, a water pump 111 is further disposed in the second thermal cycle 110 for assisting the cooling liquid to circulate in the second thermal cycle.
With continued reference to fig. 1, in the second thermal cycle 110, the coolant flows from the generator 106, through the first port 1041 of the first three-way valve 104, and out the third port 1043 of the first three-way valve 104. Meanwhile, the free port, i.e., the second port 1042, of the first three-way valve 104 is connected to the coolant inlet of the engine 101 to introduce the coolant in the second thermal cycle 110 into the engine 101 for preheating.
On the other hand, in the second heat cycle 110, the coolant flows out from the second radiator 103 to the second three-way valve 105, flows in through the second port 1052 of the second three-way valve 105, and flows out through the first port 1051, and at the same time, the free port of the second three-way valve 105, i.e., the third port 1053, is connected to the coolant outlet of the engine 101 to receive the return flow of the fluid for warming up the engine 101 to the second heat cycle 110.
In addition, the first three-way valve 104 and the second three-way valve 105 are connected to a PLC controller, i.e. a programmable logic controller, which is a digital operation electronic system specially designed for application in industrial environment, to control the opening of three ports on the two three-way valves. It uses a programmable memory, in which the instructions for implementing logical operation, sequence control, timing, counting and arithmetic operation are stored, and utilizes digital or analog input and output to control various mechanical equipments or production processes. The first three-way valve 104 and the second three-way valve 105 are connected with the PLC controller, so that the flow direction of the cooling liquid in the heat cycle system can be dynamically controlled, and better heat dissipation and preheating effects can be achieved.
In one embodiment, sensors are disposed on the engine 101 and the plurality of high voltage devices (including the generator 106, the driving motor 107 and the charger 108), and the sensors are connected to the PLC controller to dynamically control the opening of the valve ports of the two three-way valves according to the heating requirement of the engine and the heat dissipation requirement of the plurality of high voltage devices.
In an embodiment, a vehicle ambient temperature sensor is further disposed in the heat cycle system, and the vehicle ambient temperature sensor is connected to the PLC controller to dynamically control the opening of the valve ports of the two three-way valves according to the vehicle ambient temperature, the heating requirement of the engine, and the heat dissipation requirements of the plurality of high-pressure devices.
FIG. 2 is a schematic flow chart illustrating a method for warming up an engine using a thermal cycle system according to another aspect of the present disclosure.
Referring to fig. 2, a vehicle engine warm-up method 200 provided by the present invention includes:
step 201: and in response to the actual temperature of the engine meeting a preset temperature threshold, closing the valve ports of the first three-way valve and the second three-way valve, which are connected with the engine, to stop preheating the engine.
As is readily understood by those skilled in the art, when the vehicle is driven by the electric energy of the high-voltage storage battery before the engine reaches the threshold value of the starting water temperature, a large amount of heat is inevitably generated in the second heat cycle, and the heat dissipation in the form of the second heat cycle of the cooling liquid and the preheating of the engine is controlled by adjusting the two three-way valves.
The water temperature of the engine needs to be monitored in real time in the working process, when the starting temperature of the engine meets the requirement, a connecting channel between the engine and the second heat cycle is closed, and when the temperature of the engine cannot meet the temperature threshold value for warming up, valve ports, connected with the engine, of the first three-way valve and the second three-way valve need to be opened, so that the engine can absorb a part of heat from the second heat cycle to heat the engine.
When the heating of the engine is finished and the preset temperature threshold is reached, the pipeline connection between the engine and the second heat cycle is closed, and the engine does not participate in the heat management cycle any more, so that the reliability of the heat dissipation cycle of the engine and the heat dissipation of the high-voltage equipment is ensured.
With continued reference to fig. 2, the vehicle engine warm-up method 200 provided by the present invention further includes:
step 202: and determining the heat dissipation requirement levels of the plurality of high-voltage devices, and closing a valve port of the first three-way valve connected with the second radiator to stop the second radiator from dissipating heat for the plurality of high-voltage devices in response to the heat dissipation requirement levels being lower than a preset level.
In one embodiment, determining the heat dissipation requirement level of the plurality of high voltage devices comprises: when the actual temperature of a high-voltage device is higher than the target temperature, calculating a ratio of a difference value between the actual temperature and the target temperature of the high-voltage device to the target temperature, and determining the heat dissipation requirement grade of the high-voltage device according to a mapping relation between the ratio and the heat dissipation requirement grade of the high-voltage device; when the actual temperature of the high-voltage equipment is not higher than the target temperature, the high-voltage equipment has no heat dissipation requirement; and taking the maximum value of the heat dissipation requirement grades in the plurality of high-voltage devices as the heat dissipation requirement grades of the plurality of high-voltage devices.
For example, the heat dissipation requirement level is determined by the temperature sensors arranged on the high-voltage equipment, the body temperatures of the generator, the driving motor and the charger CAN be respectively obtained through the CAN signals of the temperature sensors, and the heat dissipation requirement of the high-voltage equipment is calculated through the following formula:
the heat dissipation requirement Y (generator) of the high-voltage equipment is (actual temperature-target temperature)/target temperature 100%;
the heat dissipation requirement Y (driving motor) of the high-voltage equipment is (actual temperature-target temperature)/target temperature 100%;
the heat dissipation requirement Y (a charger) of the high-voltage equipment is equal to (actual temperature-target temperature)/target temperature 100%;
y MAX (generator), Y (driving motor), Y (charger) }
It is easy to understand that if the calculated percentage of the heat dissipation requirement is negative, it indicates that the high voltage device has no heat dissipation requirement.
After the percentage of the heat dissipation requirement is calculated, the following table can be checked, and the heat dissipation requirement grade of the high-voltage equipment is determined according to the calculated percentage of the heat dissipation requirement.
When the heat dissipation requirement of the high-pressure equipment is low, the third valve port of the first three-way valve can be closed, so that the cooling liquid in the second heat cycle does not dissipate heat through the second radiator any more.
With continued reference to fig. 2, the vehicle engine warm-up method 200 provided by the present invention further includes:
step 203: and in response to the actual temperature of the engine not meeting the preset temperature threshold and the heat dissipation requirement levels of the plurality of high-voltage devices not being lower than the preset level, determining the heating requirement level of the engine, and dynamically controlling the opening degrees of the first three-way valve and the second three-way valve based on the heating requirement level of the engine and the heat dissipation requirement levels of the plurality of high-voltage devices.
In one embodiment, determining the heating demand level of the engine comprises: when the target temperature of the engine is higher than the actual temperature, calculating a ratio of a difference value between the target temperature and the actual temperature of the engine to the target temperature, and determining the heating demand level of the engine according to a mapping relation between the ratio value and the heating demand level of the engine; and when the target temperature of the engine is not higher than the actual temperature, the engine has no heating requirement.
For example, the real-time temperature of the engine is obtained through a sensor arranged on the engine, and then the heating requirement of the engine is calculated according to the following formula:
the engine heating demand percentage X ═ (target temperature-actual temperature)/target temperature 100%;
it will be appreciated that if the calculated percentage of heating demand is negative, it indicates that the engine is not presently demanding heating.
The heating demand level is then determined based on the percentage of heating demand of the engine according to the following table.
In one embodiment, the dynamically controlling the opening degrees of the first three-way valve and the second three-way valve based on the heating demand level of the engine and the heat dissipation demand level of the plurality of high-pressure devices includes: determining a thermal cycle demand level for the thermal cycle system based on the heating demand level of the engine and the heat dissipation demand level of the plurality of high-voltage devices; and according to the thermal cycle demand grade, determining the valve port opening values of the first three-way valve and the second three-way valve by looking up a table, and representing the valve port opening values of the first three-way valve and the second three-way valve under different thermal cycle demand grades.
In one embodiment, the determining a heat cycle demand level of the heat cycle system based on the heating demand level of the engine and the heat dissipation demand level of the plurality of high voltage devices includes: determining a weighting coefficient of a heating demand level of the engine and a heat dissipation demand level of the plurality of high-voltage devices according to an ambient temperature of the vehicle; and weighting the heating demand level of the engine and the heat dissipation demand levels of the plurality of high-voltage devices by adopting the weight coefficient to obtain the thermal cycle demand level.
For example, the thermal cycle demand level may be set to Q ═ a × Lv _ heating + b × Lv _ Cooling, where Lv _ heating is the heating demand level of the engine, and Lv _ Cooling is the heat dissipation demand level of the high-voltage device, and the weighted values a and b are different at different temperatures, for example, the weighted values may be determined according to the ambient temperature by looking at the following table.
TABLE 3 ambient temperature and weight coefficient mapping table
| Ambient temperature deg.C | T≤-10℃ | -10℃＜T≤10 | 10℃＜T≤35 | 35℃＜T |
| Weight coefficient | a＝0.9 b＝0.1 | a＝0.6 b＝0.4 | a＝0.4 b＝0.6 | a＝0.1 b＝0.9 |
It will be readily appreciated that the thermal cycle demand level Q calculated by the above method is likely to be fractional, and the integer value of the thermal cycle demand level can be determined by the following table for arithmetic processing of the square wave.
TABLE 4 thermal cycle demand level correction
| |
0≤Q≤1 | 1＜Q≤3 | 3＜Q≤4 | 4＜Q≤5 | 5＜Q≤6 | 6＜Q≤7 | 7＜Q≤9 | 9＜Q≤10 |
| |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
We thus get a thermal cycle demand level weighted by the engine heating demand and the high voltage device heat dissipation demand.
Fig. 3 is a numerical map showing the valve port opening of two three-way valves according to the variation of the heat cycle demand level according to an embodiment of the present invention.
Referring to fig. 3, the abscissa in fig. 3 represents the thermal cycle demand level, and the ordinate represents the opening degree of the third valve ports of the first three-way valve and the second three-way valve.
For example, as shown in fig. 3, assuming that the heat cycle demand level is 5 according to the above calculation method, the curve scaled by the square in fig. 3 is the opening degree value of the third port of the first three-way valve, i.e., 77%, and the curve scaled by the triangle is the opening degree value of the third port of the second three-way valve, i.e., 61%. The graph shown in fig. 3 can be obtained from a number of experiments.
By adopting the method, the opening degree signals of the first three-way valve and the second three-way valve are dynamically corrected in real time, so that the effect of heating the engine is realized while the high-voltage equipment is effectively radiated.
FIG. 4 is a flowchart illustrating a method for warming up an engine according to an embodiment of the present invention.
Referring to fig. 4, in an embodiment, the engine warm-up method according to the present invention first executes step 401: and judging whether the water temperature of the engine meets a preset threshold temperature. If yes, go to step 402: the engine connection to the second thermal cycle is closed. In connection with fig. 1, the second port 1042 of the first three-way valve 104 and the third port 1053 of the second three-way valve 105 in fig. 1 are closed. After the valve is closed, the liquid flow direction of the first three-way valve flows into the first valve port, and flows out of the third valve port; the fluid flow direction of the second three-way valve is that the second valve port flows in and the first valve port flows out.
If the water temperature of the engine does not reach the preset threshold, go to step 403: and judging whether the heat dissipation requirement of the high-voltage equipment is high. The criterion for determining whether the heat dissipation requirement is high can be seen in table 1. If not, go to step 404: the second radiator passage is closed, which in connection with fig. 1 is the third valve port 1043 of the first three-way valve 104 and the second valve port 1052 of the second three-way valve 105, so that the coolant no longer enters the second radiator 103 for heat dissipation. At this time, the flow direction of the first three-way valve is the first valve port inflow and the second valve port outflow, and the liquid flow direction of the second three-way valve is the third valve port inflow and the first valve port outflow.
At the same time step 405 is executed: meanwhile, whether the starting water temperature of the engine meets a preset threshold value is judged, and if yes, the step 402 is returned to.
Step 406 is also performed: and judging whether the high-voltage equipment has high heat dissipation requirements or not, wherein the judgment standard can be seen in table 1.
No matter the judgment is made in step 403 or step 406, if there is a high heat dissipation requirement in the high voltage device, step 407 is executed: the opening of the valve port of the three-way valve is dynamically adjusted according to the method set forth above. In this case, the sum of the opening values of the second port and the third port is 100% for the first three-way valve, and similarly, the sum of the opening values of the second port and the third port is 100% for the second three-way valve.
It should be noted that, the sum of the opening values of 100% is only an exemplary illustration, and the purpose is to illustrate that the sum of the outlet ports of the two three-way valves reaches the maximum value when the opening values of the two three-way valves are dynamically adjusted. In practice, this maximum value is not necessarily 100%, and may vary depending on the type of valve.
While, for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated that the methodologies are not limited by the order of acts, as some acts may, in accordance with one or more embodiments, occur in different orders and/or concurrently with other acts from that shown and described herein or not shown and described herein, as would be understood by one skilled in the art.
Fig. 5 is a schematic device structure diagram of a vehicle engine preheating device according to another aspect of the present invention.
Another aspect of the present invention provides a vehicle engine warm-up device 500, comprising a memory 501 and a processor 502 coupled to the memory, the processor 502 being configured to perform the steps of any of the engine warm-up methods described above.
According to another aspect of the present invention, embodiments of a computer storage medium are also provided herein.
The computer storage medium has a computer program stored thereon. The computer program, when executed by a processor, may implement the steps of any of the vehicle engine warm-up methods described above.
Those of skill in the art would understand that information, signals, and data may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits (bits), symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The processors described herein may be implemented using electronic hardware, computer software, or any combination thereof. Whether such processors are implemented as hardware or software depends upon the particular application and the overall design constraints imposed on the system. As an example, a processor, any portion of a processor, or any combination of processors presented in this disclosure may be implemented with a microprocessor, a microcontroller, a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), a Programmable Logic Device (PLD), a state machine, gated logic, discrete hardware circuitry, and other suitable processing components configured to perform the various functions described throughout this disclosure. The functionality of a processor, any portion of a processor, or any combination of processors presented in this disclosure may be implemented in software executed by a microprocessor, microcontroller, DSP, or other suitable platform.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.
In one or more exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software as a computer program product, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a web site, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk (disk) and disc (disc), as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk and blu-ray disc where disks (disks) usually reproduce data magnetically, while discs (discs) reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. A heat cycle system for vehicle engine warm-up comprising: the engine and the first radiator are connected through a pipeline of cooling liquid to form a first heat cycle, and the first three-way valve, the second radiator, the second three-way valve and the high-pressure equipment are sequentially connected end to end through the pipeline of the cooling liquid to form a second heat cycle;
the idle valve port of the first three-way valve is connected with a coolant inlet of the engine so as to introduce the cooling liquid in the second thermal cycle into the engine for preheating, and the idle valve port of the second three-way valve is connected with a coolant outlet of the engine so as to receive the liquid for preheating the engine and return the liquid to the second thermal cycle; and
the first three-way valve and the second three-way valve are connected with a PLC controller to control the opening degree of three valve ports on the two three-way valves.
2. The heat cycle system as claimed in claim 1, wherein sensors are provided on the engine and the plurality of high-pressure devices, and the sensors are connected to the PLC controller to dynamically control the opening degrees of the two three-way valves according to the heating requirement of the engine and the heat dissipation requirement of the plurality of high-pressure devices.
3. The heat cycle system of claim 2, further comprising a vehicle ambient temperature sensor connected to the PLC controller to dynamically control the opening of the valve ports of the two three-way valves in conjunction with the vehicle ambient temperature, the heating requirements of the engine, and the heat dissipation requirements of the plurality of high-pressure devices.
4. A heat cycle system as set forth in claim 1, wherein a water pump is further provided in said second heat cycle for assisting the circulation of the coolant in said second heat cycle.
5. The thermal cycle system of claim 1, wherein the plurality of high voltage devices include a generator, a drive motor, and a charger.
6. A warm-up method of a vehicle engine employing the heat cycle system for warm-up of a vehicle engine according to claim 1, the warm-up method comprising:
in response to the actual temperature of the engine meeting a preset temperature threshold, closing valve ports of the first and second three-way valves connected with the engine to stop preheating the engine;
determining the heat dissipation requirement levels of the plurality of high-voltage devices, and in response to the heat dissipation requirement levels being lower than preset levels, closing valve ports, connected with the second heat dissipater, of the first three-way valve to stop the second heat dissipater from dissipating heat for the plurality of high-voltage devices; and
in response to the actual temperature of the engine not meeting the preset temperature threshold and the heat dissipation requirement levels of the plurality of high-voltage devices not being lower than the preset level, determining a heating requirement level of the engine, and dynamically controlling the opening degrees of the first three-way valve and the second three-way valve based on the heating requirement level of the engine and the heat dissipation requirement levels of the plurality of high-voltage devices.
7. The warm-up method according to claim 6, wherein the dynamically controlling the opening degrees of the first three-way valve and the second three-way valve based on the heating demand level of the engine and the heat dissipation demand level of the plurality of high-pressure devices, includes:
determining a thermal cycle demand level of the thermal cycle system based on a heating demand level of the engine and a heat dissipation demand level of the plurality of high-voltage devices; and
according to the thermal cycle demand grade, determining the valve port opening values of the first three-way valve and the second three-way valve by looking up a table, and representing the valve port opening values of the first three-way valve and the second three-way valve under different thermal cycle demand grades.
8. The warm-up method according to claim 7, wherein the determining the heat cycle demand level of the heat cycle system based on the heating demand level of the engine and the heat dissipation demand levels of the plurality of high-voltage devices includes:
determining weighting coefficients of a heating demand level of the engine and a heat dissipation demand level of the plurality of high-voltage devices according to a vehicle ambient temperature; and
and weighting the heating demand level of the engine and the heat dissipation demand levels of the plurality of high-voltage devices by adopting the weight coefficients to obtain the heat cycle demand level.
9. The warm-up method of claim 6, wherein said determining a heating demand level of said engine comprises:
when the target temperature of the engine is higher than the actual temperature, calculating a ratio of a difference value between the target temperature and the actual temperature of the engine to the target temperature, and determining the heating demand level of the engine according to a mapping relation between the ratio and the heating demand level of the engine; and
when the target temperature of the engine is not higher than the actual temperature, the engine has no heating requirement.
10. The method of preheating according to claim 6, wherein determining a heat dissipation requirement level of the plurality of high voltage devices comprises:
when the actual temperature of a high-voltage device is higher than the target temperature, calculating the ratio of the difference value between the actual temperature and the target temperature of the high-voltage device to the target temperature, and determining the heat dissipation requirement grade of the high-voltage device according to the mapping relation between the ratio value and the heat dissipation requirement grade of the high-voltage device;
when the actual temperature of the high-voltage equipment is not higher than the target temperature, the high-voltage equipment has no heat dissipation requirement; and
and taking the maximum value of the heat dissipation requirement grades in the high-voltage equipment as the heat dissipation requirement grades of the high-voltage equipment.
11. A warm-up device of a vehicle engine, comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the steps of the method of warming up a vehicle engine according to any one of claims 6 to 10.
12. A computer-readable medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method for warming up a vehicle engine according to any one of claims 6 to 10.
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Address after: 314500 988 Tong Tong Road, Wu Tong Street, Tongxiang, Jiaxing, Zhejiang Applicant after: United New Energy Automobile Co.,Ltd. Address before: 314500 988 Tong Tong Road, Wu Tong Street, Tongxiang, Jiaxing, Zhejiang Applicant before: Hezhong New Energy Vehicle Co.,Ltd. |
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Denomination of invention: A thermal cycle system, engine preheating method and device for vehicles Granted publication date: 20230922 Pledgee: Tongxiang Science and Technology Entrepreneurship Service Center Co.,Ltd. Pledgor: United New Energy Automobile Co.,Ltd. Registration number: Y2024330000709 |