CN111237095B - Water tank temperature control system for water-jet engine and control method thereof - Google Patents

Water tank temperature control system for water-jet engine and control method thereof Download PDF

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Publication number
CN111237095B
CN111237095B CN202010112043.4A CN202010112043A CN111237095B CN 111237095 B CN111237095 B CN 111237095B CN 202010112043 A CN202010112043 A CN 202010112043A CN 111237095 B CN111237095 B CN 111237095B
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water
water tank
engine
temperature
coolant
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CN111237095A (en
Inventor
钱丁超
段加全
刘耀东
王振喜
张连方
李显
宋志平
宫艳峰
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FAW Group Corp
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FAW Group Corp
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Priority to PCT/CN2021/077557 priority patent/WO2021169968A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/022—Adding fuel and water emulsion, water or steam
    • F02M25/0227—Control aspects; Arrangement of sensors; Diagnostics; Actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/022—Adding fuel and water emulsion, water or steam
    • F02M25/0221—Details of the water supply system, e.g. pumps or arrangement of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/022—Adding fuel and water emulsion, water or steam
    • F02M25/025—Adding water
    • F02M25/03—Adding water into the cylinder or the pre-combustion chamber

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

The invention relates to the technical field of automobiles, in particular to a carA water tank temperature control system for a water jet engine and a control method thereof. The water tank temperature control system for the water-jet engine comprises a water tank, a heating module, an acquisition module and a control module, wherein the heating module comprises an electric heating unit and an engine coolant heating unit which are used for heating water in the water tank; acquisition module can be used to gather temperature T in the water tankWater tankThe ambient temperature T of the vehicleEnvironment(s)And the temperature T of the coolant in the engineEngine(ii) a The control module is in communication connection with the heating module and the acquisition module respectively and is used for controlling the starting or stopping of the heating module according to the information acquired by the acquisition module. This water tank temperature control system can guarantee that the vehicle is long-term to be gone and water in the water tank can not freeze under extremely cold environment, has expanded the ambient temperature lower limit that water injection system used, guarantees water injection system job stabilization.

Description

Water tank temperature control system for water-jet engine and control method thereof
Technical Field
The invention relates to the technical field of automobiles, in particular to a water tank temperature control system for a water jet engine and a control method thereof.
Background
With the increasing strictness of oil consumption and emission regulations, the compression ratio is raised to be an important technical measure for improving the thermal efficiency of the engine, but the higher the compression ratio is, the higher the possibility of knocking under a heavy load condition is. The engine water injection technology can reduce the temperature of intake air by injecting water into an intake manifold or a cylinder, thereby reducing the temperature of the whole working cycle and effectively inhibiting the occurrence of knocking, so that the engine water injection technology is a technology for effectively improving the thermal efficiency of an engine.
Water freezes below freezing, and water injection systems therefore face freezing problems in cold environments. The icing of water in the water tank of the water spraying system can cause the system to be incapable of normally supplying water to the engine, and the icing of water stored in the pipeline can cause the damage of parts such as a water rail, a water sprayer and the like, so that the existing engine water spraying system can stop working when the ambient temperature is close to 0 ℃, and does not spray water to the engine any more, so that the working temperature range of the water spraying system is greatly limited, and the engine water spraying technology is not favorable for being used in high-latitude cold regions.
Therefore, a need exists for a water tank temperature control system for a water jet engine that addresses the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a water tank temperature control system for a water-jet engine, which aims to solve the problem that a water-jet system of the water-jet engine in the prior art cannot be used in a cold region.
In order to realize the purpose, the following technical scheme is provided:
in one aspect, a water tank temperature control system for a water jet engine is provided, comprising:
a water tank for containing water;
the heating module is arranged in the water tank and comprises an electric heating unit and an engine coolant heating unit;
a collection module for collecting the temperature T of water in the water tankWater tankThe ambient temperature T of the vehicleEnvironment(s)And the temperature T of the coolant in the engineEngine；
And the control module is in communication connection with the heating module and the acquisition module respectively, and is used for controlling the electric heating unit and the engine coolant heating unit to start or stop according to the information acquired by the acquisition module.
As a preferable scheme of the water tank temperature control system for the water jet engine, the electric heating unit comprises an electric heater, at least part of a heating end of the electric heater is located below a water level, and the electric heater is in communication connection with the control module, so that the control module controls the electric heater to start or stop according to the information collected by the collection module.
As a preferable aspect of the water tank temperature control system for a water jet engine, the engine coolant heating unit includes:
one end of the waterway switch is communicated with a cooling liquid outlet end of the engine, and the waterway switch is in communication connection with the control module;
and the water inlet end of the cooling liquid heating pipeline is communicated with the other end of the waterway switch, the water outlet end of the cooling liquid heating pipeline is communicated with the cooling liquid inlet end of the engine, and the control module controls the waterway switch to be opened or closed according to the information acquired by the acquisition module so that the cooling liquid flowing out of the engine heats the water in the water tank.
As a preferable scheme of the water tank temperature control system for the water jet engine, the acquisition module comprises:
a water tank temperature sensor arranged in the water tank and below the water level for monitoring the temperature T of the water in the water tankWater tankAnd send this information to the control module;
an ambient temperature sensor configured to be disposed on the vehicle for monitoring an ambient temperature T at which the vehicle is locatedEnvironment(s)And send this information to the control module;
an engine coolant temperature sensor configured to be disposed at a coolant outlet end of the engine for monitoring a coolant temperature T in the engineEngineAnd send this information to the control module.
As a preferable scheme of the water tank temperature control system for the water jet engine, the acquisition module further comprises:
the water tank liquid level sensor is arranged in the water tank and used for monitoring the liquid level height of water in the water tank and sending the information to the control module; when in useThe liquid level of the water in the water tank is lower than a set value H0When the temperature is higher than the preset temperature, the control module controls the heating module to stop heating, wherein H0The minimum liquid level height of the water in the water tank required by the normal work of the water spraying system.
As a preferable scheme of the water tank temperature control system for the water jet engine, when the water tank is a non-circular water tank, the electric heater is suspended in the water tank and located at the center of the water tank, and the water tank water temperature sensor is arranged on the inner wall of the water tank and located at the position farthest from the electric heater; and/or when the water tank is a round water tank, the electric heater is suspended in the water tank and is positioned in the center of the water tank, and the water tank water temperature sensor is arranged on the inner wall of the water tank.
As a preferable scheme of the water tank temperature control system for the water jet engine, the coolant heating pipeline comprises a heating part, at least part of the heating part is positioned below the water level, and when the water tank is a rectangular water tank, the heating part is in a snake shape; or when the water tank is circular, the heating part is spiral.
In another aspect, a water tank temperature control method for a water-jet engine is provided, and based on the water tank temperature control system for the water-jet engine, in a vehicle power-on starting stage, the water tank temperature control method for the water-jet engine comprises the following steps:
s11 collecting the temperature T of water in a water tankWater tankThe ambient temperature T of the vehicleEnvironment(s)And the temperature T of the coolant in the engineEngine；
S12, judgment TWater tankWhether or not T is less than or equal to0，T0Is the freezing temperature of the water in the water tank; if yes, go to step S13;
s13, judgment TEnvironment(s)Whether or not T is greater than or equal tolow，TlowThe minimum working temperature of the water injection system; if yes, go to step S14;
s14, judgment TEngineWhether or not less than Tnor，TnorIs the normal operating temperature of the engine; if yes, go to step S15; if not, go to step S16;
s15, starting the electric heating unit;
and S16, starting the engine coolant heating unit.
As a preferable aspect of the water tank temperature control method for the water jet engine, the water tank temperature control method for the water jet engine includes the steps of, during a normal driving phase of the vehicle:
s21, collecting the temperature T of the water in the water tankWater tankThe ambient temperature T at which the vehicle is locatedEnvironment(s)And a coolant temperature T in the engineEngine；
S22, judgment TWater tankWhether or not T is less than or equal to0(ii) a If yes, go to step S23;
s23, judgment TEnvironment(s)Whether or not T is greater than or equal tolow(ii) a If yes, go to step S24;
and S24, starting the engine coolant heating unit.
As a preferable scheme of the water tank temperature control method for the water jet engine, at step S11, at Δ t1Monitoring the temperature T of the water in the water tank with a sampling frequencyWater tankThe ambient temperature T at which the vehicle is locatedEnvironment(s)And a coolant temperature T in the engineEngineΔ t of said1Greater than 10 Hz; and/or at Δ t in step S212Monitoring the temperature T of the water in the water tank with a sampling frequencyWater tankThe ambient temperature T at which the vehicle is locatedEnvironment(s)And a coolant temperature T in the engineEngineΔ t of said2Greater than 10 Hz.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a water tank temperature control system for a water-jet engine, which comprises a water tank, a heating module, an acquisition module and a control module, wherein water is contained in the water tank, the heating module is arranged in the water tank, the heating module comprises an electric heating unit and an engine coolant heating unit, and the electric heating unit and the engine coolant heating unit are used for heating water in the water tankHeating the water in the water tank; acquisition module can be used to gather temperature T in the water tankWater tankThe ambient temperature T of the vehicleEnvironment(s)And the temperature T of the coolant in the engineEngine(ii) a The control module is in communication connection with the heating module and the acquisition module respectively, and the control module is used for controlling the electric heating unit and the engine coolant heating unit to start or stop according to the information acquired by the acquisition module. This water tank temperature control system can utilize electric heating unit and engine coolant liquid heating unit to heat the water in the water tank, guarantees that the vehicle is gone for a long time and can not freeze in the water of water tank under the extremely cold environment, has expanded the ambient temperature lower limit that water injection system used, and can keep the temperature in the water tank at the vehicle in-process of traveling, guarantees water injection system job stabilization.
According to the water tank temperature control method for the water-jet engine, the water tank temperature control system for the water-jet engine is applied, so that water in the water tank can be prevented from being frozen when a vehicle runs in an extremely cold environment for a long time, the lower limit of the environmental temperature of the water-jet system is expanded, the temperature of the water in the water tank can be kept in the running process of the vehicle, and the stable operation of the water-jet system is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a first schematic diagram of a water tank temperature control system for a water jet engine according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a first example of a layout of a water temperature sensor and an electric heater in a water tank according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a second example of a layout of a water temperature sensor and an electric heater in a water tank according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a first cooling liquid heating circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a second coolant heating circuit according to an embodiment of the present invention;
FIG. 6 is a second schematic diagram of a water tank temperature control system for a water jet engine according to a first embodiment of the present invention;
FIG. 7 is a schematic flow chart of a method for controlling a temperature of a water tank during a vehicle start-up phase according to a second embodiment of the present invention;
fig. 8 is a schematic flow chart of a water tank temperature control method in a normal driving phase of a vehicle according to a second embodiment of the present invention.
Reference numerals:
10-an engine; 101-engine radiator; 102-engine water pump; 103-an engine radiator inlet pipe; 104-an engine radiator water outlet pipe; 105-engine cylinder cover water outlet seat; 106-an engine temperature control module; 20-a water sprayer; 201-water spray pump; 202-water spraying pipeline; 203-water rail;
1-a water tank;
21-an electric heater; 211-a battery jar; 22-waterway switch; 23-coolant heating line; 231-a heating section; 24-a water inlet communicating pipe; 25-a water outlet communicating pipe;
31-water tank temperature sensor; 32-ambient temperature sensor; 33-tank level sensor;
and 4, controlling the module.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally laid out when the product is used, and are only for convenience of description of the present invention, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", and the like are used for descriptive purposes only or to distinguish between different structures or components and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable 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.
Example one
As shown in fig. 1, the present embodiment provides a water tank temperature control system for a water jet engine, which includes a water tank 1, a heating module, an acquisition module and a control module 4, wherein the water tank 1 is used for holding water, the heating module is arranged in the water tank 1, the heating module includes an electric heating unit and an engine coolant heating unit, both of which are used for heating water in the water tank 1; the acquisition module can be used to acquire the temperature T of the water in the water tank 1Water tankThe ambient temperature T of the vehicleEnvironment(s)And the coolant temperature T in the engine 10Engine(ii) a The control module 4 is respectively in communication connection with the heating module and the acquisition module, and the control module 4 is used for controlling the electric heating unit and the engine coolant heating unit to start or stop according to the information acquired by the acquisition module. This water tank temperature control system can utilize electric heating unit and engine coolant liquid heating unit to heat the water in the water tank 1, guarantees that the vehicle is gone for a long time and can not freeze at the water in the extremely cold environment water tank 1, has expanded the ambient temperature lower limit that water injection system used, and can keep the temperature in the water tank 1 at the vehicle in-process of traveling, guarantees water injection system job stabilization.
The water-jet engine system in the embodiment comprises an engine 10, an engine radiator 101, an engine water pump 102, an engine radiator inlet pipe 103, an engine radiator outlet pipe 104 and an engine cylinder head outlet seat 105. The engine cylinder head water outlet seat 105 is communicated with an outlet end of the engine 10, the engine water pump 102 is communicated with an inlet end of the engine 10, one end of the engine radiator water inlet pipe 103 is communicated with the engine cylinder head water outlet seat 105, the other end of the engine radiator water inlet pipe is communicated with an inlet end of the engine radiator 101, one end of the engine radiator water outlet pipe 104 is communicated with the engine water pump 102, and the other end of the engine radiator water outlet pipe is communicated with an outlet end of the engine radiator 101. Engine radiator 101 is used to radiate heat from the coolant in engine 10.
The water spraying system in the embodiment includes the water tank temperature control system, and further includes a water sprayer 20, a water spraying pump 201, a water spraying pipeline 202 and a water rail 203, wherein the water sprayer 20 is communicated with the engine 10, one end of the water spraying pipeline 202 is communicated with the water sprayer 20 through the water rail 203, the other end of the water spraying pipeline 202 is inserted below the water level in the water tank 1, and the water spraying pump 201 is arranged on the water spraying pipeline 202 and located between the water sprayer 20 and the water tank 1, and is used for pumping the water in the water tank 1 into the engine 10, so that occurrence of knocking can be effectively suppressed.
The control module 4 is used for acquiring signals of various sensors in the system and sending control signals to various actuators of the system, and can be a controller special for a water tank temperature control system or integrated with an engine ECU.
Illustratively, the Control module 4 in this embodiment is an Electronic Control Unit (ECU), which is composed of a microprocessor (CPU), a memory (ROM, RAM), an input/output interface (I/O), an analog-to-digital converter (a/D), and a large-scale integrated circuit such as a shaping circuit and a driving circuit, and the ECU is a brain of the vehicle to Control the operation of the water spraying system and the water tank temperature Control system according to the information collected by the collection module.
Preferably, the electric heating unit comprises an electric heater 21, a heating end of the electric heater 21 is at least partially positioned below the water level to ensure that the electric heater 21 can heat the water in the water tank 1, and the electric heater 21 is in communication connection with the control module 4 to enable the control module 4 to control the electric heater 21 to start or stop according to the information collected by the collecting module.
Alternatively, the number of the electric heaters 21 is at least one, and may be designed according to the requirement, and is not limited herein.
Further, the electric heating unit further comprises a battery 211, and the battery 211 is electrically connected with the electric heater 21 to provide power for the electric heater 21, so that the electric heater 21 can work normally.
Preferably, the engine coolant heating unit includes a water path switch 22 and a coolant heating pipeline 23, a water inlet end of the coolant heating pipeline 23 is communicated with a coolant outlet end of the engine 10, a water outlet end of the coolant heating pipeline is communicated with a coolant inlet end of the engine 10, the water path switch 22 is installed on the coolant heating pipeline 23 and is in communication connection with the control module 4, and the control module 4 controls the on-off of the water path switch 22 according to the information acquired by the acquisition module, so that the coolant flowing out of the engine 10 heats the water in the water tank 1.
Specifically, when the water path switch 22 is turned on, high-temperature engine coolant is led out from the engine head water outlet base 105 to the coolant heating pipe 23 in the water tank 1, and when the water path switch 22 is turned off, no new high-temperature engine coolant enters the coolant heating pipe 23 in the water tank 1.
Further, the engine coolant heating unit further includes a water inlet communicating pipe 24 and a water outlet communicating pipe 25. Wherein, one end of the water inlet communicating pipe 24 is communicated with the water outlet seat 105 of the engine cylinder cover, the other end is communicated with the water inlet end of the cooling liquid heating pipeline 23, and the waterway switch 22 is arranged on the water inlet communicating pipe 24 and is used for opening or closing the water inlet communicating pipe 24. One end of the water outlet communicating pipe 25 is communicated with the water outlet pipe 104 of the engine radiator, and the other end is communicated with the water outlet end of the cooling liquid heating pipeline 23. When the waterway switch 22 is turned on, the coolant flowing out of the engine 10 enters the coolant heating pipe 23 in the water tank 1 through the inlet communicating pipe 24, thereby heating the water in the water tank 1, and then flows out of the outlet communicating pipe 25 and enters the engine 10 by the engine water pump 102.
Specifically, the water tank 1 is used for storing pure water used by the water injection system, and the pure water in the water tank 1 enters the water rail 203 through the water injection pipeline 202 under the action of the water injection pump 201 and is injected into the engine 10 through the water injector 20. High-temperature engine coolant led out from an engine cylinder head water outlet seat 105 enters a coolant heating pipeline 23 in the water tank 1 through a water inlet communicating pipe 24, the coolant heating pipeline 23 in the water tank 1 is used for heating purified water in the water tank 1 by using heat of the engine coolant, and then the engine coolant is led into an engine radiator water outlet pipe 104 between an engine radiator 101 and an engine water pump 102 through a water outlet communicating pipe 25 to return the part of the coolant to engine coolant circulation.
Preferably, the acquisition module comprises a tank water temperature sensor 31, the tank water temperature sensor 31 being arranged in the tank 1 below the water level for monitoring the temperature T of the water in the tank 1Water tankAnd sends this information to the control module 4 so that the control module 4 controls the heating module to start or stop.
Alternatively, a plurality of tank water temperature sensors 31 may be disposed in the tank 1 and dispersed in the tank 1 as much as possible, wherein the temperature T of water in the tank 1Water tankThe value of (d) is calculated as the lowest value among the temperatures detected by the respective tank water temperature sensors 31. The tank water temperature sensor 31 needs to be mounted at a position lower than the lowest level of the tank to ensure that the temperature of the liquid in the tank is always measured by the sensor and the temperature of the air in the tank is not measured because the liquid level is lower than the sensor.
Regarding the arrangement positions of the electric heater 21 and the tank water temperature sensor 31 in the water tank 1, it is suggested to arrange only one electric heater 21 and the tank water temperature sensor 31 in view of reducing the cost of the entire vehicle, the electric heater 21 being arranged in the central region of the water tank 1, and the tank water temperature sensor 31 being arranged at the edge of the water tank 1. If the water tank 1 is square or approximately square, the distance between the two is recommended to be more than half of the length of the diagonal line, as shown in fig. 2; if the tank is circular or nearly circular, it is recommended to be larger than the tank radius, as shown in fig. 3.
Optionally, when the water tank 1 is a non-circular water tank, the electric heater 21 is suspended in the water tank 1 and located at the center of the water tank 1, and the water tank temperature sensor 31 is disposed on the inner wall of the water tank 1 and located at the farthest position from the electric heater 21, so as to reduce the influence of the electric heater 21 on the water tank temperature sensor 31 and improve the control accuracy of the control module 4.
Alternatively, when the water tank 1 is a circular water tank, the electric heater 21 is suspended in the water tank 1 at a central position of the water tank 1, and the tank water temperature sensor 31 is disposed on an inner wall of the water tank 1 to reduce an influence of the electric heater 21 on the tank temperature sensor 31.
The "circle" in the present embodiment refers to a circle and other figures that approximate a circle, and is not limited to a standard circle.
Preferably, the acquisition module further comprises an ambient temperature sensor 32, the ambient temperature sensor 32 being configured to be arranged on the vehicle for monitoring an ambient temperature T at which the vehicle is locatedEnvironment(s)And sends this information to the control module 4 so that the control module 4 controls the heating module to start or stop.
Preferably, the acquisition module further comprises an engine coolant temperature sensor (not shown) configured to be disposed at a coolant outlet end of the engine 10 for monitoring a coolant temperature T within the engine 10EngineAnd sends this information to the control module 4 so that the control module 4 controls the heating module to start or stop.
Preferably, the acquisition module further comprises a water tank liquid level sensor 33, and the water tank liquid level sensor 33 is arranged in the water tank 1 and used for monitoring the liquid level height of water in the water tank 1 and sending the information to the control module 4; when the liquid level of the water in the water tank 1 is lower than the set value H0When the temperature is higher than the preset temperature, the control module 4 controls the heating module to stop heating, wherein H0The minimum level of water in the tank 1 required for the sprinkler 20 to function properly.
Alternatively, the number of the tank level sensors 33 is at least one, and the design may be performed according to the requirement, and is not limited herein. The more the number of the water tank liquid level sensors 33 is, the higher the detection precision is, and the safety of the water tank temperature control system is improved.
Presetting a water tank water level minimum value H allowing the system to normally work in a control strategy0. When the water level sensor 33 in the water tank 1 detects that the water level in the water tank 1 is lower than the minimum value H0When the water tank 1 is short of water, the engine controller stops spraying water to the engine 10, and the control module 4 stops heating the module.
Preferably, the water inlet end pipeline and the water outlet end pipeline of the cooling liquid heating pipeline 23 are perpendicular to the bottom surface of the water tank 1, so as to increase the flow speed of the cooling liquid in the water inlet end pipeline and the water outlet end pipeline of the cooling liquid heating pipeline 23.
Further, the coolant heating line 23 includes a heating portion 231, and the heating portion 231 is at least partially located below the water level to ensure that the high-temperature coolant flowing out from the engine 10 heats the water in the water tank 1. Specifically, the heating part 231 is substantially parallel to the bottom surface of the water tank 1 to ensure that the heating part 231 is mostly located below the water level.
Preferably, the distance between the heating part 231 of the coolant heating pipeline 23 and the bottom surface of the water tank 1 is not more than one third of the height of the water tank 1, so as to ensure that the heating part 231 is still below the water level when the liquid level in the water tank 1 is low, and the heat exchange efficiency is not affected.
Alternatively, in order to increase the heat exchange amount of the pipe line with the purified water in the water tank 1, as shown in fig. 4, when the water tank 1 is a rectangular water tank, the heating part 231 has a serpentine shape to increase the flow path of the coolant heating pipe line 23, thereby improving heating efficiency.
Alternatively, in order to increase the heat exchange amount of the pipe line with the purified water in the water tank 1, as shown in fig. 5, when the water tank 1 is circular, the heating part 231 is spiral to increase the flow path of the coolant heating pipe line 23, improving heating efficiency.
Preferably, as shown in fig. 6, the water-jet engine system further includes an engine temperature control module 106, the engine temperature control module 106 is disposed on the engine cylinder head water outlet seat 105, and the engine temperature control module 106 may be an electronic thermostat or a thermal management module, and in a mode in which the engine coolant heating unit operates, if the temperature increase rate is smaller than a fixed value Δ q, the amount of circulating water is increased until the maximum amount of water q. And if the temperature rise rate is still less than the fixed value delta q, the electric heating unit is started.
Example two
The embodiment provides a water tank temperature control method for a water-jet engine, which is based on the water tank temperature control system for the water-jet engine provided by the embodiment one, so that water in the water tank 1 is heated, the water in the water tank 1 is prevented from being frozen when a vehicle runs in an extremely cold environment for a long time, the lower limit of the environmental temperature of the water-jet system is expanded, the temperature of the water in the water tank 1 can be kept in the running process of the vehicle, and the stable operation of the water-jet system is ensured.
As shown in fig. 7, the method for controlling the temperature of the water tank of the water-jet engine provided by the embodiment comprises the following steps in the vehicle power-on starting stage:
s11, collecting the temperature T of water in the water tank 1Water tankThe ambient temperature T of the vehicleEnvironment(s)And the coolant temperature T in the engine 10Engine；
S12, judgment TWater tankWhether or not T is less than or equal to0，T0Is the freezing temperature of the water in the water tank 1; if yes, go to step S13;
s13, judgment TEnvironment(s)Whether or not T is greater than or equal tolow，TlowThe minimum working temperature of the water injection system; if yes, go to step S14;
s14, judgment TEngineWhether or not less than Tnor，TnorIs the normal operating temperature of engine 10; if yes, go to step S15; if not, go to step S16;
s15, starting the electric heating unit;
and S16, starting the engine coolant heating unit.
Preferably, in step S12, if TWater tankGreater than T0Then step S11 is executed until TWater tankLess than or equal to T0Then, step S13 is executed.
Preferably, in step S13, if TEnvironment(s)Less than TlowThen step S11 is executed until TEnvironment(s)Greater than or equal to TlowThen, step S14 is executed. Alternatively, TlowThe range of (A) is-40 ℃ to-20 ℃.
In addition, in order to prevent the water spraying system from being damaged due to icing in an extremely cold environment, if the control module 4 monitors the ambient temperature TEnvironment(s)Continuously lower than the minimum working temperature T of the water injection systemlowIs greater than a calibrated value Delta T1Time, Delta T1The range of (2) is 5min-10min, the engine controller stops the water spraying of the engine, the control module 4 stops the heating module, then controls the water spraying pump 201 to rotate reversely for a period of time, and part or all of the purified water in the water spraying pipeline 202 and the water rail 203 is pumped back to the water tank 1, so that the damage to parts caused by the icing of the pipeline is prevented.
Preferably, in step S14, TnorIs 90 ℃.
Preferably, after step S15 or step S16, the method further comprises:
s17, judgment TWater tankWhether or not greater than T1If yes, stopping the electric heating unit or stopping the engine coolant heating unit; if not, step S14 is executed. Wherein, T1The upper temperature limit for the control module to shut down the heating system is preferably 1 to 4 ℃. The reason is that: in practice the water in the tank is above T1The risk of icing does not exist, heating is not needed, unnecessary heat dissipation is increased if the heating function is reused at the moment, and the efficiency of the engine is reduced on the contrary.
Optionally, in step S11, at Δ t1Monitoring the temperature T of the water in the water tank 1 at a sampling frequencyWater tankThe ambient temperature T of the vehicleEnvironment(s)And the coolant temperature T in the engine 10Engine，Δt1Greater than 10 Hz.
As shown in fig. 8, the method for controlling the temperature of the water tank of the water-jet engine provided by the embodiment comprises the following steps in the normal driving stage of the vehicle:
s21, collecting the temperature T of water in the water tank 1Water tankThe ambient temperature T of the vehicleEnvironment(s)And the coolant temperature T in the engine 10Engine；
S22, judgment TWater tankWhether or not T is less than or equal to0(ii) a If yes, go to step S23;
s23, judgment TEnvironment(s)Whether or not T is greater than or equal tolow(ii) a If yes, go to step S24;
and S24, starting the engine coolant heating unit.
Preferably, in step S22, if TWater tankGreater than T0Then step S21 is re-executed until TWater tankLess than or equal to T0Then, step S23 is executed.
Preferably, in step S23, if TEnvironment(s)Less than TlowThen step S21 is re-executed until TEnvironment(s)Greater than or equal to TlowThen, step S24 is executed. Alternatively, TlowThe range of (A) is-40 ℃ to-20 ℃.
Optionally, in step S21, at Δ t2Monitoring the temperature T of the water in the water tank 1 at a sampling frequencyWater tankThe ambient temperature T of the vehicleEnvironment(s)And the coolant temperature T in the engine 10Engine，Δt2Greater than 10 Hz.
Preferably, after step S24, the method further includes:
s25, judgment TWater tankWhether or not greater than T1If yes, go to step S26; if not, go to step S21; wherein, T1An upper temperature limit for turning off the heating system for the control module;
s26, stopping the electric heating unit or stopping the engine coolant heating unit;
s27, judging whether the engine stalls or not, if so, closing the water tank temperature control system; if not, step S21 is executed again.
Preferably, T1From 1 ℃ to 4 ℃. The reason is that: in practice the water in the tank is above T1The risk of icing does not exist, heating is not needed, unnecessary heat dissipation is increased if the heating function is reused at the moment, and the efficiency of the engine is reduced on the contrary.
Furthermore, it should be noted that the minimum operating temperature T of the water injection systemlowTwo factors are mainly considered for the selection of (1): firstly, when the ambient temperature is lower than TlowMeanwhile, the temperature of the intake air of the engine 10 when it enters the cylinder is also lowThe temperature of the whole working cycle is low, knocking is not easy to occur, and the performance of the engine 10 is improved without starting a water injection system, so that the water tank 1 is not required to be preheated by starting a water tank temperature control system, and unnecessary energy waste is avoided; secondly, when the ambient temperature is lower than TlowIn time, the tank temperature control system is used to defrost the purified water in the tank 1 or maintain the water temperature at the freezing temperature T0The above electric energy consumption is large, the heat dissipation loss of the engine coolant is also large, the performance improvement of the engine 10 caused by the operation of the water injection system cannot compensate the consumption caused by the electric energy consumption and the excessive heat dissipation loss of the engine coolant, and the fuel economy of the whole vehicle is reduced, so that the starting of the water tank temperature control system is not suggested.
The water tank temperature control method for the water-jet engine can solve the problem that a water-jet system can normally supply water in a cold environment, and provides the technical scheme that the water tank is unfrozen when a vehicle is started in the cold environment and the technical scheme that the water-jet system is prevented from being frozen in the running process of the vehicle, so that water stored in the water tank for starting the vehicle in the cold environment can be unfrozen as soon as possible, and the freezing phenomenon can be avoided in the running process.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (3)

1. The water tank temperature control method for the water-jet engine is characterized in that based on a water tank temperature control system for the water-jet engine, the water tank temperature control system for the water-jet engine comprises a water tank (1), a heating module, an acquisition module and a control module (4), wherein the water tank (1) is used for containing water; the heating module is arranged in the water tank (1), and comprises an electric heating unit and an engine coolant heating unit; the acquisition module is used for acquiring a water temperature T water tank in the water tank (1), an environment temperature T environment where a vehicle is located and a cooling liquid temperature T engine in the engine (10); the control module (4) is respectively in communication connection with the heating module and the acquisition module, and the control module (4) is used for controlling the electric heating unit and the engine coolant heating unit to start or stop according to the information acquired by the acquisition module;
in the vehicle power-on starting stage, the water tank temperature control method for the water-jet engine comprises the following steps:
s11, collecting the temperature T of water in the water tank (1)Water tankThe ambient temperature T of the vehicleEnvironment(s)And a coolant temperature T in the engine (10)Engine；
S12, judgment TWater tankWhether or not T is less than or equal to0，T0Is the freezing temperature of the water in the water tank (1); if yes, go to step S13;
s13, judgment TEnvironment(s)Whether or not T is greater than or equal tolow，TlowThe minimum working temperature of the water injection system; if yes, go to step S14;
s14, judgment TEngineWhether or not less than Tnor，TnorIs a normal operating temperature of the engine (10); if yes, go to step S15; if not, go to step S16;
s15, starting the electric heating unit;
and S16, starting the engine coolant heating unit.
2. The water tank temperature control method for a water jet engine according to claim 1, characterized in that the water tank temperature control method for a water jet engine comprises the steps of:
s21, collecting the temperature T of the water in the water tank (1) when the vehicle normally runsWater tankThe ambient temperature T at which the vehicle is locatedEnvironment(s)And a coolant temperature T in the engine (10)Engine；
S22, judgment TWater tankWhether or not T is less than or equal to0(ii) a If yes, go to step S23;
s23, judgment TEnvironment(s)Whether or not T is greater than or equal tolow(ii) a If yes, go to step S24;
and S24, starting the engine coolant heating unit.
3. The water tank temperature control method for a water jet engine as claimed in claim 2, characterized in that in step S11, at Δ t1Monitoring the temperature T of the water in the tank (1)Water tankThe ambient temperature T at which the vehicle is locatedEnvironment(s)And a coolant temperature T in the engine (10)EngineΔ t of said1Greater than 10 Hz; and/or
In step S21, Δ t2Monitoring the temperature T of the water in the tank (1)Water tankThe ambient temperature T at which the vehicle is locatedEnvironment(s)And a coolant temperature T in the engine (10)EngineΔ t of said2Greater than 10 Hz.
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