CN111022236A - Engine thermal management system and vehicle - Google Patents
Engine thermal management system and vehicle Download PDFInfo
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- CN111022236A CN111022236A CN201911366692.0A CN201911366692A CN111022236A CN 111022236 A CN111022236 A CN 111022236A CN 201911366692 A CN201911366692 A CN 201911366692A CN 111022236 A CN111022236 A CN 111022236A
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- waste heat
- water jacket
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/02—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant
- B60H1/04—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant from cooling liquid of the plant
- B60H1/06—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant from cooling liquid of the plant directly from main radiator
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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
- F01P3/02—Arrangements for cooling cylinders or cylinder heads
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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
- 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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- 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
- F01P3/02—Arrangements for cooling cylinders or cylinder heads
- F01P2003/027—Cooling cylinders and cylinder heads in parallel
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
The application provides an engine heat management system and a vehicle, wherein the system comprises an engine, a waste heat exchanger, an electric control valve and a water pump, wherein the electric control valve is respectively communicated with the engine, the water pump and the waste heat exchanger, and the engine is respectively communicated with the water pump and the waste heat exchanger; the engine is provided with a cylinder body water jacket and a cylinder cover water jacket, the cylinder cover water jacket and the cylinder body water jacket are arranged in parallel, and the cylinder body water jacket and the waste heat exchanger are arranged in series; the electric control valve is used for controlling the distribution of fluid flow in the cylinder body water jacket and the cylinder cover water jacket. This application can fully consider the cylinder body cylinder cap to the accurate demand of temperature, realizes the cylinder body part to the special demand of temperature rise and high temperature to reduce the oil consumption and discharge.
Description
Technical Field
The application belongs to the technical field of automobile engines, and particularly relates to an engine heat management system and a vehicle.
Background
With the increasingly strict fuel consumption and emission regulations in the global automobile industry, the fuel consumption per hundred kilometers in 2025 is required to be reduced to 4L, and the target fuel consumption per hundred kilometers in 2030 is 3.2L, so that the electromotion and intellectualization are inevitable trends in automobile development. And pure electric vehicles face the problems of high vehicle price due to the cost of a battery pack, charging anxiety caused by lack of infrastructure charging facilities and user mileage anxiety. International major production host plants agree that the automotive industry will be the major development direction in the hybrid mode for some time in the future. The hybrid power heat management system has a large influence on the oil consumption and the emission of the whole vehicle, so that subsequent continuous optimization and improvement are needed.
Fig. 1 is a schematic diagram of a thermal management system of an engine in the prior art, which includes an engine, a waste heat exchanger, a catalyst, a cooling channel, a heater, and the like. As shown in fig. 1, the prior art only connects a waste heat exchanger to an engine cold cooling circulation system to solve the problem of hybrid heating in winter, but does not consider the precise requirement of a cylinder head on temperature, does not perform other precise control, and cannot effectively reduce oil consumption and emission.
Disclosure of Invention
In order to consider the accurate demand of cylinder block cylinder cap to the temperature, realize the cylinder block part to the special demand of temperature rise and high temperature to reduce oil consumption and discharge, this application provides an engine thermal management system and vehicle.
On one hand, the application provides an engine heat management system which comprises an engine, a waste heat exchanger, an electronic control valve and a water pump, wherein the electronic control valve is respectively communicated with the engine, the water pump and the waste heat exchanger, and the engine is respectively communicated with the water pump and the waste heat exchanger;
the engine is provided with a cylinder body water jacket and a cylinder cover water jacket, the cylinder cover water jacket and the cylinder body water jacket are arranged in parallel, and the cylinder body water jacket and the waste heat exchanger are arranged in series;
the electric control valve is used for controlling the distribution of fluid flow in the cylinder body water jacket and the cylinder cover water jacket.
Further, an outlet end of the water pump is communicated with an inlet end of the electric control valve, an outlet end of the electric control valve is respectively communicated with an inlet end of the waste heat exchanger and an inlet end of the engine, an outlet end of the engine is communicated with an inlet end of the water pump, and an outlet end of the waste heat exchanger is communicated with an inlet end of the cylinder water jacket;
the electric control valve is used for closing a flow passage of the cylinder water jacket when the outlet water temperature of the engine is less than or equal to a first threshold value;
the flow channel size of the cylinder water jacket and the flow channel size of the cylinder head water jacket are adjusted when the outlet water temperature of the engine is greater than the first threshold and is less than or equal to a third threshold, so that the fluid flow in the cylinder water jacket is lower than a fourth threshold;
the flow channel size of the cylinder water jacket and the flow channel size of the cylinder head water jacket are adjusted when the outlet water temperature of the engine is higher than the third threshold value, so that the fluid flow in the cylinder water jacket is lower than a fifth threshold value;
wherein the fourth threshold is less than the fifth threshold.
Further, when the outlet water temperature of the engine is less than or equal to the first threshold, the fluid flow in the water pump is lower than a second threshold;
wherein the second threshold is less than the fifth threshold.
Furthermore, a waste heat bypass valve is arranged between the electric control valve and the waste heat exchanger,
the waste heat bypass valve is used for controlling the waste heat exchanger to be in a circulation state when the outlet water temperature of the engine is less than or equal to the first threshold value, so that the waste heat exchanger heats a cylinder of the engine;
the waste heat exchanger is controlled to be in a circulation state when the outlet water temperature of the engine is greater than the first threshold and less than or equal to a sixth threshold, so that the waste heat exchanger heats fluid entering the cylinder water jacket;
the waste heat bypass valve is closed when the outlet water temperature of the engine is higher than the sixth threshold value, so that the waste heat exchanger is in a non-flow state;
wherein the sixth threshold is greater than the third threshold.
Further, the electronic control valve is further configured to control the fluid flow in the cylinder water jacket to be greater than an eighth threshold and control the fluid flow in the cylinder water jacket 6 to be lower than a ninth threshold when the external environment temperature of the engine is lower than a seventh threshold;
the waste heat bypass valve is further used for controlling the waste heat exchanger to be in a circulation state when the temperature of the external environment where the engine is located is lower than a seventh threshold value, so that the waste heat exchanger heats the fluid entering the cylinder water jacket and the fluid in the cylinder head water jacket;
wherein the fourth threshold, the fifth threshold, and the ninth threshold are all less than the eighth threshold.
Further, the system also includes a thermostat and a radiator, the thermostat being in communication with the engine and the radiator, respectively;
when the engine is in a small circulation state, the outlet end of the engine is communicated with the inlet end of the thermostat, and the outlet end of the thermostat is communicated with the inlet end of the water pump;
when the engine is in a large circulation state, the outlet end of the engine is communicated with the inlet end of the thermostat, the outlet end of the thermostat is communicated with the inlet end of the radiator, and the outlet end of the radiator is communicated with the inlet end of the water pump.
Furthermore, the system also comprises a warm air circulating device, one end of the warm air circulating device is communicated with the outlet end of the engine, and the other end of the warm air circulating device is communicated with the inlet end of the water pump.
Furthermore, the system also comprises an expansion water bottle, wherein one end of the expansion water bottle is communicated with the outlet end of the engine, and the other end of the expansion water bottle is communicated with the inlet end of the water pump.
Furthermore, a heat-insulating layer is arranged on the water jacket of the cylinder body.
In another aspect, the present application further provides a vehicle including an engine thermal management system as described above.
The application provides an engine thermal management system and vehicle sets up the automatically controlled valve in sender thermal management system, this automatically controlled valve respectively with the engine the water pump with waste heat exchanger intercommunication, through the automatically controlled valve control the cylinder body water jacket with the distribution of the fluid flow in the cylinder cap water jacket can be to the accurate demand of cylinder body cylinder cap to the temperature, through the control flow distribution, and accurate control makes the cylinder wall temperature rise, reduces friction and heat transfer effect to reduce the oil consumption and discharge. The problems of cold-state oil consumption and emission of the engine, high heating energy consumption and influence on hybrid endurance mileage during low-temperature running of the whole vehicle, and low temperature of the cylinder wall of the hybrid engine and great space improvement are effectively solved.
Drawings
In order to more clearly illustrate the technical solutions and advantages of the embodiments of the present application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a prior art engine thermal management system.
FIG. 2 is a schematic structural diagram of an engine thermal management system according to an embodiment of the present disclosure.
Wherein, the reference numbers in the figures are: 1-engine, 2-waste heat exchanger, 3-electric control valve, 4-water pump, 5-cylinder water jacket, 6-cylinder water jacket, 7-waste heat bypass valve, 8-thermostat, 9-radiator, 10-warm air circulating device, 11-expansion kettle and 12-insulating layer.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
FIG. 2 is a schematic structural diagram of an engine thermal management system according to an embodiment of the present disclosure. As shown in FIG. 2, the engine thermal management system may include: the system comprises an engine 1, a waste heat exchanger 2, an electronic control valve 3 and a water pump 4, wherein the electronic control valve 3 is respectively communicated with the engine 1, the water pump 4 and the waste heat exchanger 2, and the engine 1 is respectively communicated with the water pump 4 and the waste heat exchanger 2.
The engine 1 is provided with a cylinder body water jacket 5 and a cylinder cover water jacket 6, the cylinder cover water jacket 6 is connected with the cylinder body water jacket 5 in parallel, and the cylinder body water jacket 5 is connected with the waste heat exchanger 2 in series.
The electrically controlled valve 3 may be used to control the distribution of fluid flow in the cylinder block water jacket 5 and the cylinder head water jacket 6.
In the embodiment of the application, the outlet end of the water pump 4 is communicated with the inlet end of the electric control valve 3, the outlet end of the electric control valve 3 is communicated with the inlet end of the waste heat exchanger 2 and the inlet end of the engine 1, the outlet end of the engine 1 is communicated with the inlet end of the water pump 4, and the outlet end of the waste heat exchanger 2 is communicated with the inlet end of the cylinder water jacket 5.
The electronic control valve 3 may be configured to close a flow passage of the cylinder water jacket 5 when the outlet water temperature of the engine 1 is less than or equal to a first threshold.
In practical application, when the outlet water temperature of the engine 1 is less than or equal to the first threshold, the cylinder water channel flow channel is controlled to be closed through the electric control valve, so that no water flows through the cylinder water channel, and oil consumption and emission at the stage are reduced.
The electronic control valve 3 may be further configured to adjust the size of the flow passage of the cylinder water jacket 5 and the size of the flow passage of the cylinder head water jacket 6 when the outlet water temperature of the engine 1 is greater than the first threshold and is less than or equal to a third threshold, so that the fluid flow rate in the cylinder water jacket 5 is lower than a fourth threshold.
In practical application, when the outlet water temperature of the engine 1 is greater than the first threshold and less than or equal to the third threshold, the electric control valve controls the opening of the water channel flow passage, and adjusts the flow distribution of the cylinder water jacket and the cylinder cover water jacket to enable the cylinder water channel to be in a low flow state.
The electronic control valve 3 may be further configured to adjust the size of the flow passage of the cylinder water jacket 5 and the size of the flow passage of the cylinder head water jacket 6 when the outlet water temperature of the engine 1 is greater than the third threshold, so that the fluid flow rate in the cylinder water jacket 5 is lower than a fifth threshold.
Wherein the fourth threshold is less than the fifth threshold.
In practical application, when the outlet water temperature of the engine 1 is greater than the third threshold, the electric control valve is adjusted to enable the flow of the cylinder water jacket to be in a proper small flow state.
In the embodiment of the present application, when the outlet water temperature of the engine 1 is less than or equal to the first threshold, the fluid flow rate in the water pump 4 is lower than a second threshold; wherein the second threshold is less than the fifth threshold.
In practical application, when the outlet water temperature of the engine 1 is less than or equal to the first threshold, the water pump may be controlled to be in a low flow mode or a zero flow mode, so as to reduce oil consumption and emission at this stage.
In practical application, the water pump may be an electronic water pump, the electric control valve may be an electric control three-way valve, and the value range of the threshold value may be determined according to a specific vehicle type and a specific application scenario. For example, in an application scenario, the first threshold may have a value range of 40 to 60 ℃, the third threshold may have a value range of 80 to 100 ℃, the fourth threshold may be a value representing a low flow state, the fifth threshold may be a value representing a low flow state, and the fifth threshold may be a value representing a low flow mode or a zero flow mode.
In the implementation of the application, a waste heat bypass valve 7 is further arranged between the electric control valve 3 and the waste heat exchanger 2, and the waste heat bypass valve 7 controls whether the waste heat exchanger 2 circulates or not.
The waste heat bypass valve 7 may be configured to be in an open state when the outlet water temperature of the engine 1 is less than or equal to the first threshold, and control the waste heat exchanger 2 to be in a flow state, so that the waste heat exchanger 2 heats the cylinder block of the engine 1.
In practical application, when the outlet water temperature of the engine 1 is less than or equal to the first threshold, since the flow passage of the cylinder water jacket 5 is in a closed state at the moment and no water flows, the waste heat exchanger 2 can directly heat the cylinder wall, so that the temperature of the cylinder wall is rapidly increased, and oil consumption and emission in a later stage are reduced.
The waste heat bypass valve 7 may be further configured to control the waste heat exchanger 2 to be in a flow state when the outlet water temperature of the engine 1 is greater than the first threshold and less than or equal to a sixth threshold, so that the waste heat exchanger 2 heats the fluid in the cylinder water jacket 5. Wherein the sixth threshold is greater than the third threshold.
The waste heat bypass valve 7 may be further configured to close the waste heat bypass valve 7 when the outlet water temperature of the engine 1 is greater than the sixth threshold value, so that the waste heat exchanger 2 is in a non-flow state.
In practical application, the value range of the sixth threshold may be 100-120 ℃, and when the temperature of the outlet water of the engine 1 is greater than the first threshold and less than or equal to the third threshold, the waste heat bypass valve 7 is opened (in a circulation state), and since the water jacket of the cylinder body is in a low flow state at this time, the cylinder wall temperature is further raised by heating through the waste heat exchanger 2, and meanwhile, the water temperature rise is accelerated, which is beneficial to the heating requirement. When the outlet water temperature of the engine 1 is higher than the third threshold and lower than the sixth threshold, the waste heat bypass valve 7 is opened (in a circulation state), and the cylinder water jacket is in a low-flow state at the moment, so that the water temperature entering the cylinder water jacket is greatly increased by 10 ℃ or even more after being heated by the waste heat exchanger, the cylinder wall temperature can be greatly increased by about 10 ℃, the friction is effectively reduced, the heat dissipation loss is reduced, and the oil consumption and the emission are reduced. When the outlet water temperature of the engine 1 is higher than the sixth threshold value, the waste heat bypass valve 7 is closed, and the cylinder water jacket flow passage is not heated by the waste heat exchanger, so that the cooling effect of the system is improved.
In the embodiment of the present application, when the external environment temperature of the engine is lower than the seventh threshold, the electronic control valve 3 may be further configured to control the fluid flow in the cylinder water jacket 5 to be greater than the eighth threshold, and control the fluid flow in the cylinder water jacket 6 to be lower than the ninth threshold.
The waste heat bypass valve 7 may be further configured to control the waste heat exchanger 2 to be in a circulation state, so that the waste heat exchanger 2 heats the fluid in the cylinder water jacket 5 and the fluid in the cylinder head water jacket 6. Wherein the fourth threshold, the fifth threshold, and the ninth threshold are all less than the eighth threshold.
In practical applications, the seventh threshold value may represent a value in a low-temperature environment, the eighth threshold value may represent a value in which the flow rate is large, and the ninth threshold value may represent a value in which the flow rate is small or zero.
This application embodiment, to the difference of cylinder body cylinder cap temperature demand, through the flow distribution of control valve control, accurate control makes cylinder wall temperature rise faster, and it is better to reduce friction and heat transfer effect to further reduce the oil consumption and discharge.
In one possible embodiment, continuing with fig. 2, the engine thermal management system may include an engine 1, a waste heat exchanger 2, an electronic control valve 3 and water pump 4, a waste heat bypass valve 7, a thermostat 8 and a radiator 9, the electric control valve 3 is respectively communicated with the engine 1, the water pump 4 and the waste heat exchanger 2, the engine 1 is respectively communicated with the water pump 4 and the waste heat exchanger 2, a cylinder body water jacket 5 and a cylinder cover water jacket 6 are arranged on the engine 1, the cylinder cover water jacket 6 and the cylinder body water jacket 5 are arranged in parallel, the cylinder body water jacket 5 and the waste heat exchanger 2 are arranged in series, a waste heat bypass valve 7 is arranged between the electric control valve 3 and the waste heat exchanger 2, the thermostat 8 is respectively communicated with the engine 1 and the radiator 9, and the warmer 8 is used for controlling the large and small circulation.
During the microcirculation, the temperature saver is connected with the water pump, specifically is: when the engine 1 is in a small circulation state, the outlet end of the engine 1 is communicated with the inlet end of the thermostat 8, and the outlet end of the thermostat 8 is communicated with the inlet end of the water pump 4;
during the major cycle, the thermostat is connected with the radiator, specifically is: when the engine is in a large circulation state, the outlet end of the engine 1 is communicated with the inlet end of the thermostat 8, the outlet end of the thermostat 8 is communicated with the inlet end of the radiator 9, and the outlet end of the radiator 9 is communicated with the inlet end of the water pump 4.
In practical application, the thermostat can automatically adjust the water quantity entering a radiator or a water pump, ensure that an engine works in a proper temperature range, and play a role in saving energy consumption and the like.
In a possible embodiment, as shown in fig. 2, the engine thermal management system may include an engine 1, a waste heat exchanger 2, an electronic control valve 3 and a water pump 4, a waste heat bypass valve 7, a thermostat 8, a radiator 9, and a warm air circulating device 10, wherein the electronic control valve 3 is respectively communicated with the engine 1, the water pump 4 and the waste heat exchanger 2, the engine 1 is respectively communicated with the water pump 4 and the waste heat exchanger 2, the engine 1 is provided with a cylinder water jacket 5 and a cylinder water jacket 6, the cylinder water jacket 6 is arranged in parallel with the cylinder water jacket 5, the cylinder water jacket 5 is arranged in series with the waste heat exchanger 2, the waste heat bypass valve 7 is arranged between the electronic control valve 3 and the waste heat exchanger 2, the thermostat 8 is respectively communicated with the engine 1 and the radiator 9, one end of the warm air circulating device 10 is communicated with an outlet end of the engine 1, the other end is communicated with the inlet end of the water pump 4.
In a possible embodiment, as shown in fig. 2, the engine thermal management system may include an engine 1, a waste heat exchanger 2, an electronic control valve 3 and a water pump 4, a waste heat bypass valve 7, a thermostat 8, a radiator 9, a warm air circulating device 10 and an expansion kettle 11, the electronic control valve 3 is respectively communicated with the engine 1, the water pump 4 and the waste heat exchanger 2, the engine 1 is respectively communicated with the water pump 4 and the waste heat exchanger 2, a cylinder water jacket 5 and a cylinder water jacket 6 are arranged on the engine 1, the cylinder water jacket 6 is arranged in parallel with the cylinder water jacket 5, the cylinder water jacket 5 is arranged in series with the waste heat exchanger 2, the bypass valve 7 is arranged between the electronic control valve 3 and the waste heat exchanger 2, the thermostat 8 is respectively communicated with the engine 1 and the radiator 9, one end of the warm air circulating device 10 is communicated with the outlet end of the engine 1, the other end of the warm air circulating device is communicated with the inlet end of the water pump 4, one end of the expansion kettle 11 is communicated with the outlet end of the engine 1, and the other end of the expansion kettle is communicated with the inlet end of the water pump 4.
In a possible embodiment, as shown in fig. 2, the outer side of the cylinder water jacket 5 is further provided with a heat preservation layer 12, and in the hybrid pure electric mode, the cylinder water jacket heat preservation layer plays a role in heat preservation, so that oil consumption and emission in the next short-interval starting are facilitated.
In the following, taking a hybrid vehicle as an example, the control principle of the engine thermal management system provided by the embodiment of the present application is described:
monitoring the cylinder body outlet water temperature and water temperature of the engine in real time;
when the engine is in a cold start state, the water temperature T of the cylinder body outlet water is less than or equal to 50 ℃: the electric control valve controls the closing of a water jacket flow passage of the cylinder body, the opening of the waste heat bypass valve (flow state), and the electronic water pump is in a low flow mode or an O flow mode, so that the temperature of the cylinder wall is rapidly increased, and the oil consumption and the emission at the stage are reduced.
When the temperature T of the water discharged from the engine cylinder is more than 50 ℃, the electric control valve controls the opening of a cylinder water jacket flow channel, adjusts the flow distribution of the cylinder water jacket and the cylinder cover water jacket, opens the waste heat bypass valve (in a circulation state), and the cylinder water jacket is in a low-flow state, is heated by the waste heat exchanger, further raises the temperature of the cylinder wall, accelerates the rising of the water temperature, and is favorable for the heating requirement.
When the engine is in a heat engine state, the cylinder body water outlet temperature T is more than 90 ℃, the electric control valve is adjusted to enable the cylinder body water jacket to be in a proper small flow state, the waste heat bypass valve is opened (in a circulation state), the water temperature entering the cylinder body water jacket is greatly increased by 10 ℃ or even more after being heated by the waste heat exchanger, the cylinder wall temperature can be greatly increased by about 10 ℃, friction is effectively reduced, heat dissipation loss is reduced, and oil consumption and emission are reduced.
When the engine is in a high-temperature state, the cylinder body outlet water temperature T is higher than 110 ℃, the waste heat bypass valve is closed, and the cylinder body flow channel is not heated by the waste heat exchanger, so that the cooling effect of the system is improved.
Under the low temperature environment, if the passenger has the heating demand, the flow distribution is controlled to the automatically controlled valve: the cylinder body water jacket has large flow, and the cylinder cover water jacket has small flow or zero flow. At the moment, the waste heat bypass valve is opened, the heat exchange amount is increased, the heating is guaranteed, the atomization under the low-temperature condition is facilitated due to the small flow or the zero flow of the cylinder cover, and the oil consumption and the emission can be effectively reduced.
The embodiment of the application also provides a vehicle, and the vehicle comprises the engine thermal management system in the embodiment.
The engine heat management system and the vehicle provided by the embodiment of the application have the following beneficial effects:
(1) the engine, the water pump and the waste heat exchanger are respectively communicated with the engine, the water pump and the waste heat exchanger, the distribution of fluid flow in the cylinder body water jacket and the cylinder cover water jacket is controlled through the electric control valve, the temperature of a cylinder wall can be accurately controlled to rise by controlling flow distribution according to the accurate requirement of the cylinder body and the cylinder cover on the temperature, and the friction and heat transfer effects are reduced, so that the oil consumption and the emission are reduced.
(2) When the engine is in a cold state, the temperature of water flow entering the cylinder body branch is heated by the waste heat heater, so that the temperature rise of the cylinder wall is accelerated, and oil consumption and emission are reduced.
(3) When the engine is in a heat engine state, the flow (small flow) entering the cylinder body is controlled by the control valve, and further the waste heat heater is used for heating, so that the temperature of the cylinder wall can be increased to reduce friction and heat dissipation loss, and oil consumption and emission are reduced.
(4) When the external environment of the engine is a low-temperature environment, the purpose of heating is achieved by utilizing exhaust waste heat recovery, and the endurance mileage of the hybrid power is increased.
(5) This application scribbles the heat preservation at the outer surface of cylinder body water jacket, can keep warm to the engine under whole car is in pure electric mode to start engine warm-up time next time with higher speed, further reduce the oil consumption and discharge.
It should be noted that: the sequence of the embodiments of the present application is only for description, and does not represent the advantages and disadvantages of the embodiments. And specific embodiments thereof have been described above. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. The engine heat management system is characterized by comprising an engine (1), a waste heat exchanger (2), an electronic control valve (3) and a water pump (4), wherein the electronic control valve (3) is respectively communicated with the engine (1), the water pump (4) and the waste heat exchanger (2), and the engine (1) is respectively communicated with the water pump (4) and the waste heat exchanger (2);
the engine (1) is provided with a cylinder body water jacket (5) and a cylinder cover water jacket (6), the cylinder cover water jacket (6) and the cylinder body water jacket (5) are arranged in parallel, and the cylinder body water jacket (5) and the waste heat exchanger (2) are arranged in series;
the electric control valve (3) is used for controlling distribution of fluid flow in the cylinder body water jacket (5) and the cylinder cover water jacket (6).
2. The system according to claim 1, characterized in that the outlet end of the water pump (4) communicates with the inlet end of the electrically controlled valve (3), the outlet end of the electrically controlled valve (3) communicates with the inlet ends of the waste heat exchanger (2) and the engine (1), respectively, the outlet end of the engine (1) communicates with the inlet end of the water pump (4), and the outlet end of the waste heat exchanger (2) communicates with the inlet end of the block water jacket (5);
the electronic control valve (3) is used for closing a flow passage of the cylinder water jacket (5) when the outlet water temperature of the engine (1) is less than or equal to a first threshold value;
and the flow channel size of the cylinder water jacket (5) and the flow channel size of the cylinder head water jacket (6) are adjusted when the outlet water temperature of the engine (1) is greater than the first threshold and is less than or equal to a third threshold, so that the fluid flow in the cylinder water jacket (5) is lower than a fourth threshold;
and the flow channel size of the cylinder water jacket (5) and the flow channel size of the cylinder head water jacket (6) are adjusted when the outlet water temperature of the engine (1) is greater than the third threshold value, so that the fluid flow in the cylinder water jacket (5) is lower than a fifth threshold value;
wherein the fourth threshold is less than the fifth threshold.
3. The system according to claim 2, characterized in that when the leaving water temperature of the engine (1) is less than or equal to the first threshold value, the fluid flow in the water pump (4) is lower than a second threshold value;
wherein the second threshold is less than the fifth threshold.
4. System according to claim 2, characterized in that a waste heat bypass valve (7) is further arranged between the electrically controlled valve (3) and the waste heat exchanger (2),
the waste heat bypass valve (7) is used for controlling the waste heat exchanger (2) to be in a circulation state when the outlet water temperature of the engine (1) is less than or equal to the first threshold value, so that the waste heat exchanger (2) heats a cylinder block of the engine (1);
and when the outlet water temperature of the engine (1) is greater than the first threshold value and less than or equal to a sixth threshold value, controlling the waste heat exchanger (2) to be in a circulation state, so that the waste heat exchanger (2) heats the fluid entering the cylinder water jacket (5);
and the waste heat bypass valve (7) is closed when the outlet water temperature of the engine (1) is higher than the sixth threshold value, so that the waste heat exchanger (2) is in a non-circulation state;
wherein the sixth threshold is greater than the third threshold.
5. The system of claim 2,
the electronic control valve (3) is further used for controlling the fluid flow in the cylinder water jacket (5) to be larger than an eighth threshold value and controlling the fluid flow in the cylinder head water jacket ()6 to be lower than a ninth threshold value when the external environment temperature of the engine is lower than a seventh threshold value;
the waste heat bypass valve (7) is further used for controlling the waste heat exchanger (2) to be in a circulation state when the temperature of the external environment where the engine is located is lower than the seventh threshold value, so that the waste heat exchanger (2) heats the fluid entering the cylinder water jacket (5) and the fluid in the cylinder head water jacket (6);
wherein the fourth threshold, the fifth threshold, and the ninth threshold are all less than the eighth threshold.
6. The system according to claim 1, characterized in that it further comprises a thermostat (8) and a radiator (9), said thermostat (8) being in communication with said engine (1) and said radiator (9), respectively;
when the engine (1) is in a small circulation state, the outlet end of the engine (1) is communicated with the inlet end of the thermostat (8), and the outlet end of the thermostat (8) is communicated with the inlet end of the water pump (4);
when the engine is in a large circulation state, the outlet end of the engine (1) is communicated with the inlet end of the thermostat (8), the outlet end of the thermostat (8) is communicated with the inlet end of the radiator (9), and the outlet end of the radiator (9) is communicated with the inlet end of the water pump (4).
7. The system according to claim 1, characterized in that it further comprises a warm air circulating device (10), one end of the warm air circulating device (10) being in communication with an outlet end of the engine (1) and the other end being in communication with an inlet end of the water pump (4).
8. The system according to claim 1, characterized in that it further comprises an expansion tank (11), one end of said expansion tank (11) communicating with the outlet end of said engine (1) and the other end communicating with the inlet end of said water pump (4).
9. The system according to claim 2, characterized in that the outer surface of the block jacket (5) is further provided with an insulation layer (12).
10. A vehicle comprising an engine thermal management system according to any of claims 1-9.
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