CN107701292B - Anti-scalding expansion water tank cover at high temperature of engine, expansion water tank and control method thereof - Google Patents
Anti-scalding expansion water tank cover at high temperature of engine, expansion water tank and control method thereof Download PDFInfo
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- CN107701292B CN107701292B CN201711143279.9A CN201711143279A CN107701292B CN 107701292 B CN107701292 B CN 107701292B CN 201711143279 A CN201711143279 A CN 201711143279A CN 107701292 B CN107701292 B CN 107701292B
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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
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
- F01P11/0204—Filling
- F01P11/0209—Closure caps
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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
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
- F01P11/0204—Filling
- F01P11/0209—Closure caps
- F01P11/0247—Safety; Locking against opening
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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
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/14—Indicating devices; Other safety devices
- F01P11/16—Indicating devices; Other safety devices concerning coolant temperature
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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
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/14—Indicating devices; Other safety devices
- F01P11/18—Indicating devices; Other safety devices concerning coolant pressure, coolant flow, or liquid-coolant level
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2023/00—Signal processing; Details thereof
- F01P2023/08—Microprocessor; Microcomputer
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Temperature (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses an expansion water tank cover for preventing scalding at high temperature of an engine, which comprises the following components: a housing having an inner groove, and a through hole provided at an upper portion thereof and communicating with the inner groove, and a stopper spring provided at a lower portion thereof; an electromagnet provided at an upper portion of the inner tank; the upper part of the push rod is provided with a magnet which can be matched with the electromagnetic body to attract or separate, the lower part of the push rod is provided with a fluted disc, the push rod can slide up and down in the inner groove relative to the shell, and the sliding position is determined by the stop spring; the gear ring is fixed above the inside of the water tank, and can be meshed with the fluted disc to fix the fluted disc when the push rod slides upwards; and a spring disposed between the electromagnet and the push rod. The invention also discloses an expansion water tank for preventing scalding at high temperature of the engine. The invention also discloses a control method of the expansion water tank for preventing scalding at high temperature of the engine.
Description
Technical Field
The invention relates to the field of engine water tanks, in particular to an expansion water tank cover capable of preventing scalding during high temperature of an engine, an expansion water tank and a control method of the expansion water tank.
Background
The high-temperature fault (commonly called boiling) of the engine is often encountered in the running process of the automobile, and at the moment, the working temperature of the automobile reaches the temperature which is too high for the normal working temperature range, so that the normal working of the machine is influenced and the machine is damaged. The engine is high in temperature because of a plurality of reasons, and besides high-temperature weather, the overload operation of the air conditioner and the failure of the radiating element can also cause the vehicle to be high in temperature. When the engine fails at high temperature, water in the expansion water tank can boil and generate certain pressure in the expansion water tank, however, many drivers immediately blindly open the expansion water tank cover to add cooling liquid after the engine fails at high temperature, and under the action of the pressure, the high-temperature cooling liquid can be sprayed outwards to cause personnel scalding. The driver is often scalded by such events each year.
Disclosure of Invention
The invention designs and develops an expansion water tank cover for preventing scalding when an engine is at a high temperature, and aims to prevent the expansion water tank cover from being blindly opened by a driver when the engine is in high-temperature fault, and the problem of scalding caused by high-temperature cooling liquid spraying.
The invention designs and develops an expansion water tank for preventing scalding when an engine is at a high temperature, and aims to prevent the expansion water tank from being blindly opened by a driver when the engine is in high-temperature fault and the problem of scalding caused by high-temperature cooling liquid spraying.
The invention designs and develops a control method of an expansion water tank for preventing scalding when an engine is at a high temperature, and aims to pre-judge whether an electromagnet is electrified or not according to pre-processed pressure data and temperature data so as to better match a push rod in the water tank to slide up and down and prevent a water tank cover from being blindly opened by a driver.
The technical scheme provided by the invention is as follows:
an expansion tank cap for preventing scalding at high temperature of an engine, comprising:
a housing having an inner groove, and a through hole provided at an upper portion thereof, which communicates with the inner groove, and a stopper spring provided at a lower portion thereof;
an electromagnet provided at an upper portion of the inner tank;
the upper part of the push rod is provided with a magnet which can be matched with the electromagnetic body to attract or separate, the lower part of the push rod is provided with a fluted disc, the push rod can slide up and down in the inner groove relative to the shell, and the sliding position is determined by the stop spring;
the gear ring is fixed above the inside of the water tank, and can be meshed with the fluted disc to fix the fluted disc when the push rod slides upwards;
and a spring disposed between the electromagnet and the push rod.
Preferably, the housing is threadably connected to the engine water tank.
Preferably, a sealing ring is arranged at the contact part of the top of the push rod and the inner groove.
An expansion water tank for preventing scald when an engine is at high temperature comprises an expansion water tank cover.
It is preferred that the composition of the present invention,
a temperature sensor fixedly installed below the inside of the water tank;
a pressure sensor fixedly installed above the inside of the water tank;
and a controller electrically coupling the temperature sensor, the pressure sensor, and the electromagnet.
A control method of an expansion water tank for preventing scalding when an engine is at high temperature, which comprises the following steps:
firstly, collecting temperature data and pressure data in a water tank, and performing empirical preprocessing on the pressure data to obtain preprocessed pressure data;
step two, transmitting the temperature data and the preprocessing pressure data to a controller;
step three, the controller is used for judging whether the electromagnet is electrified forward or electrified backward, and further controlling the electromagnet to be electrified forward or electrified backward;
wherein, in the first step, preprocessing the pressure data includes:
the pretreatment pressure P' is calculated as follows:
wherein P' is the pressure in the pretreatment water tank, P is the pressure in the water tank which is actually monitored, T is the temperature in the water tank which is actually monitored, T 0 The temperature in the tank is compared empirically.
Preferably, in the third step, the fuzzy control is adopted to output the reverse energizing probability so as to judge whether to reversely energize the electromagnet, and the method comprises the following steps:
converting the preprocessing pressure change rate, the temperature change rate in the water tank and the reverse power-on probability into quantization levels in the fuzzy theory domain respectively;
inputting the preprocessing pressure change rate and the temperature change rate in the water tank into a fuzzy control model, and uniformly dividing the preprocessing pressure change rate and the temperature change rate into 7 grades;
the fuzzy control model is output as the reverse power-on probability and is divided into 5 grades;
judging whether the electromagnet is reversely electrified according to the reverse electrifying probability;
the theory domain of the pretreatment pressure change rate is [ -1,1], the theory domain of the temperature change rate in the water tank is [ -1,1], the theory domain of the reverse power-on probability is [0,1], the quantization factors are all 1, and the threshold value of the reverse power-on probability is set to be one value of 0.45-0.58.
Preferably, the fuzzy set of the change rate of the pretreatment pressure is { NB, NM, NS, ZO, PS, PM, PB }, the fuzzy set of the change rate of the temperature in the water tank is { NB, NM, NS, ZO, PS, PM, PB }, and the fuzzy set of the reverse energizing probability is { S, SM, M, MB, B }; the membership functions are trigonometric functions.
Preferably, the control rule of the fuzzy control model is:
if the change rate of the pretreatment pressure is PM or PB, the change rate of the temperature in the water tank is PM or PB, the reverse power-on probability is B, namely data can be output, and the controller reversely powers on the electromagnet;
and if the preprocessing pressure change rate is NB, NM or NB, the temperature change rate in the water tank is NB or NM, the reverse power-on probability is S, namely data can not be output, and the controller carries out forward power-on the electromagnet.
Preferably, data output is performed according to the reverse power-on probability, and if the reverse power-on probability output is S or SM, data cannot be output; if the reverse power-on probability output is MB or B, data can be output; and if the reverse energization probability output is M, the reverse energization probability is a threshold.
Compared with the prior art, the invention has the following beneficial effects:
1. the anti-scalding expansion water tank cover device can actively and effectively prevent a driver from being scalded by cooling liquid when the engine is at high temperature, and has better safety compared with the prior common water tank cover which only provides text warning;
2. the anti-scalding expansion water tank cover device comprises an electric control device and a traditional mechanical structure, and accurate control is ensured to be realized through the synergistic effect of the electric control device and the traditional mechanical structure, so that the reliability is high and the working stability is good;
3. when the engine is shut down, the electric control element stops working, but the principle of mechanical structure design can still meet the working requirement of high-temperature locking, so that the problem that the water tank cover is opened to spray high-temperature cooling liquid due to power failure of the electric control element after the engine is shut down is avoided, and the applicability is strong;
4. the invention relates to an anti-scalding expansion water tank cover device at high temperature of an engine, wherein a water tank cover cannot rotate at high temperature of the engine; the possibility that a water tank cover comprising a pressure relief device is scalded by high-temperature steam when a driver is subjected to pressure relief is avoided;
5. according to different temperatures in the water tank, the invention preprocesses the pressure data in the water tank, reduces the error of the pressure data, adopts a fuzzy control model to carry out fuzzy control on the output of the energizing probability of the electromagnet, increases the forecasting accuracy, improves the energizing probability of the electromagnet, and better matches the up-and-down sliding of the push rod to meet the locking requirement of the water tank cover.
Drawings
Fig. 1 is a sectional view of a tank cover.
FIG. 2 is a cross-sectional view of the pushrod of FIG. 1 taken along the "A-A" plane.
Fig. 3 is a cross-sectional view showing the case cover and the case body not being mated when the temperature of the coolant is low.
Fig. 4 is a cross-sectional view of the tank cover and the tank body after the tank cover is matched with the tank body at high temperature of the engine.
Fig. 5 is a partial cross-sectional view taken along the plane "B-B" of the gear ring gear of fig. 4 engaged.
Fig. 6 is a cross-sectional view showing the case cover and the case body not being mated when the temperature of the coolant is low.
Fig. 7 is a cross-sectional view of the tank cover and the tank body after the tank cover is mated at high temperature of the engine.
FIG. 8 is a partial cross-sectional view of the gear tooth ring of FIG. 7 engaged along the "B-B" plane.
FIG. 9 is a graph of membership functions for the rate of change of preconditioning pressure.
Fig. 10 is a graph showing membership functions for the rate of change of temperature in a water tank.
Fig. 11 is a membership function of reverse energization probability.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
The invention discloses an expansion water tank cover device for preventing scalding when an engine is at high temperature; when the engine has high-temperature fault, the ECU selects the current direction and the current magnitude to electrify the electromagnet by reading a signal of a temperature sensor arranged in the expansion water tank, so that the electromagnet and the head part of the push rod with the magnet are attracted to each other; in addition, a certain pressure is generated in the expansion water tank, and under the combined action of the pressure and the pressure, the square push rod head in the water tank cover overcomes the pretightening force of the spring to compress the spring to move upwards under the action of the attractive force and the pressure; the gear disc at the tail end of the push rod is meshed with the gear ring fixed in the water tank, and the expansion water tank cover cannot be opened in a rotating mode at the moment; after the water temperature is reduced, the ECU selects a current direction opposite to the previous direction to electrify the electromagnet by reading a signal of a temperature sensor arranged in the expansion water tank, so that the electromagnetic is mutually repelled with the head of the push rod with the magnet, the internal pressure of the cooling system is reduced, the push rod moves downwards under the action of the pretightening force and repulsive force of the spring, the gear disc is separated from the gear ring, and the water tank cover can be rotated and opened to meet the requirements of daily cooling liquid compensation and replacement.
As shown in fig. 1 to 3, the present invention discloses an expansion tank cover for preventing scald at high temperature of an engine, wherein the outer shape of a tank cover housing 100 is a stepped cylinder, the upper cylinder acts to increase friction force with hands when rotating the tank cover, the lower end of the tank cover housing 100 is provided with threads for connecting with an expansion tank body, a through hole 160 is provided above the tank cover housing 100, a square inner groove 120 communicated with the through hole 160 is provided inside, an electromagnet 111b is placed above the inside of the square inner groove 120, and wires of the electromagnet can be connected to outside through the through hole; the position of the electromagnet is fixed by a stop spring 140; a cylindrical spring 150 is arranged below the electromagnet, and a push rod mechanism is arranged below the spring; the through hole 160 ensures that the pressure above the upper surface of the push rod mechanism is atmospheric; a groove is arranged below the square inner groove and is used for placing the stop spring 140; the push rod consists of a step square head 110, a square sealing ring 130, an upper surface magnet 111a and a terminal gear 112a, and the push rod head 110 and the terminal gear 112a are connected by a cylinder; the sealing is ensured by the matching surface between the push rod head and the square inner groove surface, and meanwhile, the square sealing ring 130 is arranged above the push rod head to ensure sealing again; the head of the push rod can move up and down in the square inner groove under the attraction and repulsion force of the electromagnet and the pressure difference.
As shown in fig. 3 to 5, the present invention discloses an expansion tank for preventing scald at high temperature of an engine, comprising an expansion tank cover using the present invention, a temperature sensor 220 and an ECU controller; the temperature sensor 220 is installed below the inside 210 of the water tank, and the ECU controller electrically connects the temperature sensor 220 and the electromagnet 111b, and controls the electromagnet according to the temperature inside the water tank.
As shown in fig. 6 to 8, in another embodiment, a pressure sensor 230 is further included, which is installed above the tank interior 210, and at this time, the ECU controller simultaneously electrically connects the temperature sensor 220, the pressure sensor 230 and the electromagnet 111b, and controls the electromagnet according to the pressure and temperature in the tank.
The actual working process of the anti-scald water tank cover is specifically described below by combining the upper limit position and the lower limit position of the push rod.
Example 1
The invention discloses a control method of an expansion water tank for preventing scalding when an engine is at a high temperature, as shown in fig. 3, setting a temperature threshold value to be 50 ℃, when the water temperature is lower than 50 ℃, an ECU reads a signal of a temperature sensor 220 arranged in the expansion water tank, and after judging that the temperature is lower than 50 ℃, the electromagnet is electrified positively; after the forward power is applied, the electromagnet generates the same magnetic pole as the magnet on the surface of the push rod, the electromagnet and the push rod repel each other, the push rod generates a downward movement trend, and in addition, the push rod mechanism is also under the elasticity of the compressed cylindrical spring and the action of self gravity; under the combined action of the three, the push rod is positioned at a lower limit position, and the lower limit position is determined by the position of the stop spring 140; when the water tank cover is installed, firstly, the angle of the water tank cover is adjusted to enable the tail end gear 112a of the push rod to pass through the gear ring 112b on the water tank body; at this time, the gear is not meshed with the gear ring, the gear is arranged below the gear ring, the water tank cover is connected with the water tank body through threads after the water tank cover is rotated, the distance between the gear and the gear ring is continuously increased, and after the threads are screwed, if the cooling liquid in the expansion water tank is in a normal temperature state at this time, the working state of the whole expansion water tank is shown in figure 3.
As shown in fig. 4 and 5, when the temperature of the engine water is higher than 50 ℃, particularly when a high-temperature fault occurs, the temperature of the cooling liquid rises and even boils, the interior 210 of the expansion tank generates higher pressure, the pressure acts on the lower surface 114 of the push rod head, a pressure difference is generated between the pressure and the atmospheric pressure on the upper surface, and the push rod has a tendency to move upwards under the pressure effect; in addition, the ECU reads the signal of the temperature sensor 220 arranged in the expansion tank, and after judging that the temperature is higher than 50 ℃, the electromagnet is reversely electrified, and after the reverse electrification, the electromagnet generates a magnetic pole opposite to that of the magnet on the surface of the push rod, and the two mutually attract each other, so that the push rod generates a trend of upward movement; under the combined action of air pressure and attractive force, the push rod moves upwards until the cylindrical spring 150 is compressed to the maximum compression deformation, the push rod reaches the upper limit position, the gear 112a at the tail end is meshed with the gear ring 112b fixed on the water tank body, namely the working state shown in fig. 4 is achieved, at the moment, if the water tank cover is rotated, the push rod cannot rotate due to the meshing of the gear ring, and the square inner groove in the water tank cover shell is matched with the head part of the push rod, and the square structure does not generate relative rotation between the square inner groove and the head part of the push rod; therefore, in the case of fig. 4, the entire water tank cover cannot be rotated, that is, the water tank cover cannot be opened.
When the temperature of the cooling liquid is reduced below 50 ℃, the pressure in the expansion water tank is greatly reduced, the push rod moves downwards to reach the lower limit position again under the action of repulsive force, spring force and self gravity of the push rod, at the moment, the gear is separated from the gear ring, and after the threads of the rotary water tank cover are completely unscrewed, the gear is still below the gear ring, namely the gear ring cannot interfere the rotary motion of the water tank cover; at this time, the angle of the water tank cover is adjusted to enable the end gear 112a of the push rod to pass through the gear ring 112b on the water tank body, and the water tank cover can be integrally opened to meet the daily cooling liquid compensation and replacement requirements.
When the engine has high-temperature faults, most drivers can choose to stop and stall, at the moment, the ECU cannot acquire temperature information, the electromagnet is powered off, and at the moment, the device is changed into a pure mechanical control structure; if the water temperature is high, the expansion tank interior 210 generates high pressure, the pressure acts on the lower surface 114 of the push rod head, and a pressure difference is generated between the pressure and the atmospheric pressure on the upper surface, the push rod moves upwards under the pressure, at this time, the gear 112a at the tail end of the push rod and the gear ring 112b fixed on the tank body can still be meshed, and the tank cover cannot be opened. Along with the temperature reduction, the pressure in the expansion tank is greatly reduced, the push rod moves downwards to reach the lower limit position again under the action of spring force and gravity of the push rod, and the tank cover can be opened at the moment, namely the effect of protecting the safety of a driver can be still achieved after the operation is stopped.
Example 2
As shown in fig. 6 to 8, the invention also discloses a control method of the expansion water tank for preventing scalding at high temperature of the engine, which comprises the following steps:
firstly, collecting temperature T and pressure P in a water tank, and performing empirical pretreatment on pressure data to obtain pretreatment pressure P';
step two, transmitting the temperature T and the pretreatment pressure P' to a controller;
step three, the ECU controller is used for judging whether the electromagnet is electrified forward or reversely, so that the electromagnet is controlled to be electrified forward or reversely, when the ECU controller is used for electrifying the electromagnet forward after judgment, the electromagnet generates the same magnetic pole as the magnet on the surface of the push rod after the electromagnet is electrified forward, the electromagnet and the push rod repel each other, and the push rod generates a downward movement trend; when the ECU controller reversely electrifies the electromagnet after judgment, the electromagnet generates magnetic poles opposite to the magnet on the surface of the push rod after reverse electrifies, the two magnetic poles are attracted to each other, and the push rod generates a trend of upward movement;
wherein, in step one, preprocessing the pressure data includes:
the pretreatment pressure P' is calculated as follows:
wherein P' is the pressure in the pretreatment water tank, the unit is MPa, P is the pressure in the water tank actually monitored, the unit is MPa, T is the temperature in the water tank actually monitored, the unit is DEG C 0 For empirically comparing the temperature in the water tank, the unit is the temperature; in the present embodiment, T 0 ＝50℃。
In another embodiment, in the third step, a fuzzy control model is used to output a reverse power-on probability to determine whether reverse power-on data is output, including the following steps: the pretreatment pressure change rates E P Rate of change E of temperature in tank T And converting the reverse power-on probability into a quantization level in the fuzzy theory domain; rate of change of pressure E to be pretreated P Rate of change E of temperature in tank T Inputting a fuzzy control model, outputting the fuzzy control model as reverse power-on probability, further predicting whether data is output or not, wherein the threshold value of the reverse power-on probability is one value of 0.45-0.58, if the reverse power-on probability reaches a set threshold value, the reverse power-on probability data can be output, reverse power-on is performed, and if the reverse power-on probability does not reach the set threshold value, the reverse power-on probability data cannot be output, and forward power-on is performed; in the present embodiment, in order to ensure the control accuracy, the control device can be used in different environmentsThe control was performed well, and the threshold was determined to be 0.51 based on trial and error.
Pretreatment pressure change rate E P The variation range of (C) is [ -1,1]Rate of change E of temperature in tank T The variation range of (C) is [ -1,1]The quantization factors are set to 1, so the pretreatment pressure change rate E P The domains of the temperature change rate in the water tank are [ -1,1 respectively]And [ -1,1]The argument of reverse power-on probability is [0,1]The method comprises the steps of carrying out a first treatment on the surface of the In order to ensure the control precision, the device can well control the pressure in different environments, and finally the pretreatment pressure change rate E is realized according to trial and error P The range of variation of (2) is divided into 7 grades, the fuzzy set is { NB, NM, NS, ZO, PS, PM, PB }, NB represents negative big, NM represents negative medium, NS represents negative small, ZO represents zero, PS represents positive small, PM represents positive medium, PB represents positive big; rate of change E of temperature in tank T The range of variation of (2) is divided into 7 grades, the fuzzy set is { NB, NM, NS, ZO, PS, PM, PB }, NB represents negative big, NM represents negative medium, NS represents negative small, ZO represents zero, PS represents positive small, PM represents positive medium, PB represents positive big; the output reverse power-on probability is divided into 5 grades, the fuzzy set is { S, SM, M, MB, B }, S represents small, SM represents small, M represents medium, MB represents large, and B represents large; the membership functions are triangular membership functions, as shown in fig. 9, 10 and 11.
The control rule selection experience of the fuzzy control model is as follows:
if the pretreatment pressure change rate E P The temperature change rate E in the water tank is positive or neutral T If the current is positive or positive, the reverse electrifying probability is high, namely data can be output, and at the moment, the ECU controller reversely electrifies the electromagnet;
if the pretreatment pressure change rate E P Is negative big, negative medium or negative small, and the temperature change rate E in the water tank T And if the power is negative, large or negative, or medium, the reverse power-on probability is small, namely data can not be output, and the ECU controller carries out forward power-on the electromagnet.
That is, if the reverse energization probability is "small or smaller", data is not outputtable, at which time the ECU controller performs forward energization control of the electromagnet; if the reverse power-on probability is 'large or larger', data can be output, and the ECU controller performs reverse power-on control on the electromagnet at the moment; if the reverse power-on probability is 'medium', the reverse power-on probability is a threshold value, and if the temperature or the pressure in the water tank is slightly changed, switching between the two cases of reverse power-on and forward power-on is necessarily formed; specific fuzzy control rules are shown in table 1.
TABLE 1 fuzzy control rules
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (9)
1. An expansion tank cover for preventing scalding at high temperature of an engine, comprising:
a housing having an inner groove, and a through hole provided at an upper portion thereof, which communicates with the inner groove, and a stopper spring provided at a lower portion thereof;
an electromagnet disposed on the upper portion of the inner tank;
the upper part of the push rod is provided with a magnet which can be matched with the electromagnet for attraction or separation, the lower part of the push rod is provided with a fluted disc, the push rod can slide up and down in the inner groove relative to the shell, and the sliding position is determined by the stop spring;
the gear ring is fixed above the inside of the water tank, and can be meshed with the fluted disc to fix the fluted disc when the push rod slides upwards;
a spring disposed between the electromagnet and the push rod;
and a sealing ring is arranged at the contact part of the top of the push rod and the inner groove.
2. The expansion tank cover for preventing scald at high temperature of engine as defined in claim 1, wherein said housing is screw-connected with the engine tank.
3. An expansion tank for preventing scalding at a high temperature of an engine, comprising an expansion tank cover according to any one of claims 1 to 2.
4. An expansion tank for preventing scalding at high temperature of an engine as set forth in claim 3,
a temperature sensor fixedly installed below the inside of the water tank;
a pressure sensor fixedly installed above the inside of the water tank;
and the controller is electrically connected with the temperature sensor, the pressure sensor and the electromagnet.
5. A method of controlling an expansion tank for preventing scalding at a high temperature of an engine, characterized by using the expansion tank according to any one of claims 3 to 4, comprising the steps of:
firstly, collecting temperature data and pressure data in a water tank, and performing empirical preprocessing on the pressure data to obtain preprocessed pressure data;
step two, transmitting the temperature data and the preprocessing pressure data to a controller;
step three, the controller is used for judging whether the electromagnet is electrified forward or electrified backward, and further controlling the electromagnet to be electrified forward or electrified backward;
wherein, in the first step, preprocessing the pressure data includes:
the pretreatment pressure P' is calculated as follows:
wherein P' is the pressure in the pretreatment water tank, P is the pressure in the water tank which is actually monitored, T is the temperature in the water tank which is actually monitored, T 0 The temperature in the tank is compared empirically.
6. The method for controlling an expansion tank for preventing burn at high temperature of engine as claimed in claim 5, wherein in said step three, a reverse energizing probability is outputted by fuzzy control to judge whether to reversely energize the electromagnet, comprising the steps of:
converting the preprocessing pressure change rate, the temperature change rate in the water tank and the reverse power-on probability into quantization levels in the fuzzy theory domain respectively;
inputting the preprocessing pressure change rate and the temperature change rate in the water tank into a fuzzy control model, and uniformly dividing the preprocessing pressure change rate and the temperature change rate into 7 grades;
the fuzzy control model is output as the reverse power-on probability and is divided into 5 grades;
judging whether the electromagnet is reversely electrified according to the reverse electrifying probability;
the theory domain of the pretreatment pressure change rate is [ -1,1], the theory domain of the temperature change rate in the water tank is [ -1,1], the theory domain of the reverse power-on probability is [0,1], the quantization factors are all 1, and the threshold value of the reverse power-on probability is set to be one value of 0.45-0.58.
7. The method for controlling an expansion tank for preventing burn-out at high engine temperature according to claim 6, wherein said fuzzy set of the pre-treatment pressure change rate is { NB, NM, NS, ZO, PS, PM, PB }, said fuzzy set of the temperature change rate in the tank is { NB, NM, NS, ZO, PS, PM, PB }, and said fuzzy set of the reverse energization probability is { S, SM, M, MB, B }; the membership functions are trigonometric functions.
8. The method for controlling an expansion tank for preventing scald at high temperature of an engine as claimed in claim 7, wherein the control rule of the fuzzy control model is:
if the change rate of the pretreatment pressure is PM or PB, the change rate of the temperature in the water tank is PM or PB, the reverse power-on probability is B, namely data can be output, and the controller reversely powers on the electromagnet;
and if the preprocessing pressure change rate is NB, NM or NB, the temperature change rate in the water tank is NB or NM, the reverse power-on probability is S, namely data can not be output, and the controller carries out forward power-on the electromagnet.
9. The control method of an expansion tank for preventing burn at high temperature of engine according to claim 8, wherein data output is performed according to the reverse energization probability, and if the reverse energization probability output is S or SM, data is not outputtable; if the reverse power-on probability output is MB or B, data can be output; and if the reverse energization probability output is M, the reverse energization probability is a threshold.
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| CN110966080B (en) * | 2018-09-30 | 2021-11-05 | 北汽福田汽车股份有限公司 | Cover body structure, auxiliary water tank, vehicle and locking method of cover body structure of auxiliary water tank |
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