CN112664366B - Oil rail heating system and method and vehicle - Google Patents
Oil rail heating system and method and vehicle Download PDFInfo
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- CN112664366B CN112664366B CN202011548189.XA CN202011548189A CN112664366B CN 112664366 B CN112664366 B CN 112664366B CN 202011548189 A CN202011548189 A CN 202011548189A CN 112664366 B CN112664366 B CN 112664366B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 281
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000446 fuel Substances 0.000 claims abstract description 115
- 239000002826 coolant Substances 0.000 claims abstract description 50
- 238000004321 preservation Methods 0.000 claims description 11
- 238000001704 evaporation Methods 0.000 abstract description 12
- 230000008020 evaporation Effects 0.000 abstract description 12
- 239000003921 oil Substances 0.000 description 85
- 238000011217 control strategy Methods 0.000 description 14
- 238000000889 atomisation Methods 0.000 description 11
- 230000001276 controlling effect Effects 0.000 description 11
- 238000002347 injection Methods 0.000 description 9
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
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- 238000005265 energy consumption Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Combined Controls Of Internal Combustion Engines (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The application discloses an oil rail heating system, an oil rail heating method and a vehicle, wherein the oil rail heating system comprises an oil rail body, a heating unit and a heating control unit, and the heating unit is connected with the oil rail body and used for heating the oil rail body; the heating control unit is electrically connected with the heating unit, and the heating control unit is configured to control the working mode of the heating unit according to the ambient temperature, the fuel temperature and the engine coolant temperature. The utility model discloses an oil rail heating system can carry out the corresponding mode of execution of control heating unit after comprehensive judgement according to ambient temperature, fuel temperature and engine coolant temperature, realizes heating for the oil rail body under the low temperature condition for this internal fuel temperature of oil rail rises, and the evaporation performance of fuel is improved, and the atomizing quality obtains improving.
Description
Technical Field
The application relates to the technical field of automobiles, in particular to an oil rail heating system, an oil rail heating method and an oil rail heating vehicle.
Background
As consumer demands for vehicle performance increase and emissions standards and related emissions regulations tighten, the starting performance, fuel economy, and emissions performance of automotive engines are facing higher challenges. At the same time, there is an increasing demand from consumers for alternative fuels (e.g., ethanol, methanol) that also place higher demands on the cold start performance of the engine. The cold start refers to the fact that an automobile is started under the condition that the water temperature of an engine is low, fuel evaporation is poor at the moment, the atomization effect of the fuel after injection is poor, the fuel is not easy to ignite, the phenomenon of difficulty in starting is easy to occur, and customer experience is seriously influenced.
In order to ensure successful starting, the traditional gasoline engine generally increases the fuel injection amount during cold starting, but the fuel injection amount can cause serious wet wall of an intake manifold, a cylinder barrel, a piston and the like, the fuel consumption is increased sharply, and the emission exceeds the standard and the carbon deposit amount is increased.
On some special fuel engines (such as ethanol engines), two or more heating resistors are installed in the oil rail to heat the fuel, but the structure of the oil rail is complex, the difficulty of designing and manufacturing the oil rail is increased, and the development cost is increased. Moreover, the heating device is usually of an internal heating type, and a heating resistor is in direct contact with fuel, so that if the heating device is not used properly, the risk of engine fire and the like can be caused.
Disclosure of Invention
In view of this, the present application provides an oil rail heating system, a method and a vehicle, which can improve the fuel atomization effect and have higher safety.
The following technical scheme is specifically adopted in the application:
one aspect of the present application provides an oil rail heating system, which includes an oil rail body, a heating unit, and a heating control unit,
the heating unit is connected with the oil rail body and used for heating the oil rail body;
the heating control unit is electrically connected with the heating unit, and the heating control unit is configured to control the working mode of the heating unit according to the ambient temperature, the fuel temperature and the engine coolant temperature.
Preferably, the heating unit is a heating belt, and the heating belt is attached to the outer wall of the oil rail body;
a thermistor is arranged in a heating loop of the heating belt;
the heating control unit is configured to acquire a resistance value of the thermistor, and obtain the fuel temperature based on the resistance value of the thermistor.
Preferably, the system comprises a first temperature sensor and a second temperature sensor, both of which are electrically connected to the heating control unit;
the first temperature sensor is used for acquiring an environment temperature signal and sending the environment temperature signal to the heating control unit;
the second temperature sensor is used for collecting an engine coolant temperature signal and sending the engine coolant temperature signal to the heating control unit;
the heating control unit is further configured to receive the ambient temperature signal and the engine coolant temperature signal.
Preferably, the heating control unit is further configured to control the heating unit to be in a heating mode when the ambient temperature is below a first threshold;
in the heating mode, if the resistance value of the thermistor is higher than a second threshold value, the heating unit is controlled to keep the current heating mode.
Preferably, the heating control unit is further configured to control the heating unit to be in a warm-keeping mode if the resistance value of the thermistor is lower than the second threshold value and the engine coolant temperature is lower than a third threshold value in the heating mode.
Preferably, the heating control unit is further configured to control the heating unit to be in an off mode if the resistance value of the thermistor is lower than the second threshold value and the engine coolant temperature is higher than the third threshold value in the heating mode.
Another aspect of the present application provides a method of heating an oil rail, the method comprising the steps of:
acquiring an ambient temperature, and controlling a heating unit to be in a heating mode when the ambient temperature is lower than a first threshold value, wherein the heating unit comprises a thermistor;
acquiring the resistance value of the thermistor;
and in the heating mode, if the resistance value of the thermistor is higher than a second threshold value, controlling the heating unit to keep the current heating mode.
Preferably, the method further comprises:
in the heating mode, if the resistance value of the thermistor is lower than the second threshold value, acquiring the temperature of engine coolant;
controlling the heating unit to be in a heat-preserving mode when the temperature of the engine coolant is lower than a third threshold;
controlling the heating unit in a shut-down mode when the engine coolant temperature is above a third threshold.
Preferably, after the obtaining the ambient temperature, the method further comprises:
controlling the heating unit in an off mode when the ambient temperature is above a first threshold.
It is a further aspect of the present application to provide a vehicle having the above-described oil rail heating system.
The beneficial effects of the embodiment of the application at least lie in:
the oil rail heating system that this application embodiment provided has set up heating unit alone for the oil rail body to heating unit can be for the heating of oil rail body under microthermal condition, makes this internal fuel temperature of oil rail rise, and the evaporation performance is improved, and the atomizing quality obtains improving. The heating control unit determines the heating time of the oil rail body after comprehensive judgment according to the environment temperature, the fuel temperature and the engine coolant temperature, and the heating control unit executes the heating time automatically, so that the workload of people is reduced, and the problem of vehicle safety caused by heating the oil rail body at an improper time is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic composition diagram of an oil rail heating system provided in an embodiment of the present application.
Reference numerals are as follows:
1. an oil rail body; 2. a heating unit; 3. a heating control unit; 4. a power source.
Detailed Description
In order to make the technical solutions and advantages of the present application clearer, the following will describe the embodiments of the present application in further detail with reference to the accompanying drawings.
The starting performance of the automobile directly influences the maneuvering performance of the automobile, the labor intensity of a driver and the driving safety, is an important expression of the working reliability of the automobile and is one of important performances which the automobile needs to have in normal operation. Especially in cold regions, the starting performance of the vehicle is particularly important.
Under the condition of low temperature, the viscosity and density of the fuel are increased, the evaporativity is poor, and the atomization effect is poor after the fuel is sprayed, so that most of the fuel exists in a cylinder in a liquid state, on one hand, the wet walls of an air inlet manifold, a cylinder barrel, a piston and the like are severe, the oil consumption is increased, and the economical efficiency is influenced; on the other hand, the fuel is difficult to mix with air, which causes the over-lean mixed gas which actually participates in combustion, is difficult to catch fire, and makes the engine difficult to start. Moreover, the fuel cannot be fully combusted, and the emission is overproof, the environment is polluted, excessive carbon deposition is generated, and partial parts cannot be normally used. Therefore, overcoming the above-mentioned problems caused by the fuel property at low temperatures is of great significance for improving the starting performance of automobiles.
The embodiment of the application provides an oil rail heating system, can be automatically for the oil rail heating under the low temperature condition, and then improve the atomizing quality of fuel, promote the startability of car.
As shown in fig. 1, the oil rail heating system provided by the embodiment of the application includes an oil rail body 1, a heating unit 2 and a heating control unit 3, wherein the heating unit 2 is connected with the oil rail body 1 and is used for heating the oil rail body 1; the heating control unit 3 is electrically connected to the heating unit 2, and the heating control unit 3 is configured to control an operation mode of the heating unit 2 according to an ambient temperature, a fuel temperature, and an engine coolant temperature.
In a cold environment, when the automobile is not started for a long time, the temperature of the fuel in the fuel rail body 1 is usually close to the ambient temperature, which may result in increased viscosity and density of the fuel, poor evaporation performance, and unfavorable starting performance of the automobile. In this application embodiment, connect heating element 2 on the outer wall of oil rail body 1, like this when heating element 2 during operation, the heat of its output can be passed through oil rail body 1 and is transferred to the fuel of the inside loading of oil rail body 1, promotes the temperature of fuel, reduces the viscosity and the density of fuel, improves its evaporation performance.
The heating control unit 3 can accurately judge the heating time of the heating unit 2 for the oil rail body 1 according to the ambient temperature, the fuel temperature and the temperature of the engine coolant, and control the heating unit 2 to enter the working mode according with the current time.
The operation modes of the heating unit 2 may include a heating mode, a keeping warm mode, and a shut-down mode. Wherein, the heating mode means that the heating unit 2 continuously works to output heat to the oil rail body 1, so as to raise the temperature of the oil rail body 1; the heat preservation mode is that the heating unit 2 works intermittently to heat the oil rail body 1 when the temperature of the oil rail body 1 is dissipated too much, so that the oil rail body 1 is maintained at the current temperature, and in the heat preservation mode, the current temperature of the oil rail body 1 is usually higher than the ambient temperature; the off mode refers to that the heating unit 2 does not work and does not output heat to the oil rail body 1, and at the moment, the oil rail body 1 naturally dissipates heat.
To sum up, the oil rail heating system that this application embodiment provided has set up heating unit 2 alone for oil rail body 1 to heating unit 2 can be for the heating of oil rail body 1 under microthermal condition, makes the fuel temperature in the oil rail body 1 rise, and evaporation performance obtains improving, and the atomization quality obtains improving. The heating time of the heating unit 2 for the oil rail body 1 is determined by the heating control unit 3 after comprehensive judgment according to the environment temperature, the fuel temperature and the engine coolant temperature, and the heating is automatically executed, so that the workload of people is reduced, and the vehicle safety problem caused by heating the oil rail body 1 at an inappropriate time is avoided.
The heating apparatus in the related art is generally disposed inside the fuel rail body 1 to directly heat the fuel, but this arrangement complicates the structure of the fuel rail body 1, and if it is not properly used, it is likely to cause the risk of the engine igniting, etc. due to the direct contact of the heating apparatus with the fuel.
In some implementations of the embodiments of the present application, the heating unit 2 is a heating belt, and the heating belt is attached to the outer wall of the oil rail body 1. In the embodiment of the present application, the heating belt refers to a device with a heating function, which has flexibility and can be coated on the surface of a structure.
In the embodiment of the present application, the shape of the heating tape may be, for example, a tape shape, a sheet shape, etc., and based on the flexible design of the heating tape, the direction of the heating tape is generally arranged according to the shape of the oil rail body 1, and the heating tape is attached to the outer wall of the oil rail body 1 by, for example, pasting or binding, so as to comprehensively and uniformly heat the oil rail body 1, thereby improving the heating efficiency. The internal material and structural characteristics of the heating belt can be designed and selected according to factors such as heating speed and highest temperature requirement, so as to meet special requirements of different types and different fuel types. The heating belt is not in direct contact with fuel, and the risk of engine fire is avoided.
Illustratively, the heating belt may be an electromagnetic heating belt or a resistance heating belt.
In some embodiments of the present application, the heating circuit of the heating belt has a thermistor therein, which may be a negative temperature coefficient thermistor (NTC), i.e. the higher the temperature, the lower the resistance of the thermistor. After the heating tape is attached to the outer wall of the oil rail body 1, the thermistor is also in close contact with the outer wall of the oil rail body 1, so that after the temperature is stabilized, the temperature of the thermistor, the temperature of the oil rail body 1 and the temperature of the fuel are the same.
In the embodiment of the present application, the heating control unit 3 is configured to acquire the resistance value of the thermistor, and obtain the fuel temperature based on the resistance value of the thermistor. That is to say, in the oil rail heating system provided by the embodiment of the present application, a special sensor is not provided to collect the fuel temperature, but the heating control unit 3 reversely deduces the temperature of the thermistor through the resistance value of the thermistor, so as to obtain the fuel temperature.
The resistance value of the thermistor and the temperature have a corresponding relation, the heating control unit 3 can obtain the current resistance value of the thermistor by obtaining the current voltage loaded to the thermistor and the current passing through the thermistor, and then the temperature corresponding to the current resistance value can be found in the resistance value-temperature relation corresponding table of the thermistor through a table look-up method, wherein the temperature is the fuel temperature.
The thermistor and the heating control unit 3 can be connected through a wire harness, and the heating control unit 3 can be powered through the power supply 4.
In some implementations of embodiments of the present application, the oil rail heating system includes a first temperature sensor and a second temperature sensor, both of which are electrically connected to the heating control unit 3. The first temperature sensor is used for acquiring an environment temperature signal and sending the environment temperature signal to the heating control unit 3; the second temperature sensor is used for acquiring an engine coolant temperature signal and sending the engine coolant temperature signal to the heating control unit 3; the heating control unit 3 is also configured to receive an ambient temperature signal and an engine coolant temperature signal.
In some embodiments of the present application, the first temperature sensor may collect an external ambient temperature and transmit a collected ambient temperature signal to the heating control unit 3 in real time. The second temperature sensor may be located in the engine water jacket, collects the engine coolant temperature, and sends the collected engine coolant temperature to the heating control unit 3 in real time. The heating control unit 3 controls the operating mode of the heating element according to a preset control strategy based on the resistance value of the thermistor, the ambient temperature signal and the engine coolant temperature signal.
In some implementations of embodiments of the present application, the heating control unit 3 is further configured to:
when the ambient temperature is lower than a first threshold value, controlling the heating unit 2 to be in a heating mode;
in the heating mode, if the resistance value of the thermistor is higher than the second threshold value, the heating unit 2 is controlled to maintain the current heating mode.
In a control strategy of the heating control unit 3, when the ambient temperature is lower than the first threshold, since the fuel temperature is substantially equal to the ambient temperature, the viscosity and density of the fuel are both greatly increased, the atomization effect is poor, and smooth start of the automobile engine is not facilitated. In this case, the heating unit 2 is controlled to be in the heating mode, and at this time, since the temperature of the thermistor is low and the resistance value is large, the heating power is large, and the rapid temperature rise can be realized. After the temperature of the heating unit 2 rises, the heat is transferred to the oil rail body 1, and the oil rail body 1 further transfers the heat to the fuel in the inner cavity. In the temperature rise process of the heating unit 2, the resistance value of the thermistor is continuously reduced, and if the resistance value of the thermistor is higher than the second threshold value, it indicates that the temperature of the fuel is still not high enough at this time, the evaporation performance is still poor, and at this time, the current heating mode still needs to be maintained to continue heating. Wherein the first threshold is determined based on the characteristic of the fuel and the atomization quality of the fuel is poor when the ambient temperature is below the first threshold, which may be, for example, between-20 ℃ and-30 ℃. The second threshold is also determined based on the characteristics of the fuel, and when the resistance value of the thermistor is lower than the second threshold, the fuel temperature is higher, the pressure is too large, and danger is easy to occur, and the second threshold may be a resistance value corresponding to the thermistor at a temperature of 0 ℃. Generally, the second threshold corresponds to a temperature higher than the first threshold.
In some implementations of embodiments of the present application, the heating control unit 3 is further configured to:
in the heating mode, if the resistance value of the thermistor is lower than the second threshold value and the temperature of the engine coolant is lower than the third threshold value, the heating unit 2 is controlled to be in the heat preservation mode.
In another control strategy of the heating control unit 3, when the resistance value of the thermistor reaches a second threshold value, which indicates that the fuel temperature is higher, the viscosity of the fuel is reduced, and the evaporation performance is greatly improved. Illustratively, when the resistance value of the thermistor is smaller than the second threshold value, the resistance value of the thermistor can be reduced to be close to zero, and the heating unit 2 hardly generates heat any more, so as to achieve the purposes of heat preservation and protection.
And then, the temperature condition of the engine coolant needs to be further judged, if the temperature of the engine coolant is lower than a third threshold value, the fuel injection quantity is large, the air-fuel ratio is not reasonable enough, the current temperature needs to be kept, and the temperature of the engine water needs to be increased as soon as possible. At the moment, the heating unit 2 is in a heat preservation mode, namely when the resistance value of the thermistor is smaller than a second threshold value, the resistance value of the thermistor is close to zero, and no heat is generated; when the resistance value of the thermistor is larger than the second threshold value, the resistance value of the thermistor is larger, and heat is generated to heat the oil rail body 1. The third threshold is the temperature of the engine coolant under normal conditions, and when the temperature is lower than the third threshold, the fuel mixing effect is poor, the fuel consumption is increased, and the third threshold may be 80 ℃.
In some implementations of embodiments of the present application, the heating control unit 3 is further configured to:
in the heating mode, if the resistance value of the thermistor is lower than the second threshold value and the engine coolant temperature is higher than the third threshold value, the heating unit 2 is controlled to be in the off mode.
In another control strategy of the heating control unit 3, when the resistance value of the thermistor is lower than the second threshold value and the temperature of the engine coolant is higher than the third threshold value, the temperature of the engine water reaches the normal range at the moment, the fuel injection quantity is proper, the air-fuel ratio is reasonable, the engine is in a stable running state, the fuel rail body 1 does not need to be heated, and the heating unit 2 is controlled to be in a closed mode.
Therefore, in the oil rail heating system provided by the embodiment of the application, the heating control unit 3 can control the heating speed, the heating time and whether to work of the heating unit 2 by adjusting the voltage loaded to the thermistor and the on-off of the control loop, and the control strategy includes three working modes of heating, heat preservation and closing. In the heating mode, a larger voltage is adopted to increase the heating power and realize rapid heating, and the magnitude of the voltage can be adjusted according to a defined strategy; in the heat preservation mode, the voltage is regulated to a small value, the energy consumption of the system is reduced as much as possible under the condition of maintaining the temperature to be stable, and meanwhile, the potential safety hazard caused by abnormal temperature rise is avoided; in the off mode, the control circuit is turned off and the fuel rail body 1 is no longer heated.
After the corresponding control strategy is formulated according to different external environments and using condition requirements, the heating control unit 3 can judge the mode required by the heating unit 2, the magnitude of the control voltage and the on-off state of the control loop according to the preset control strategy and the actual state of the vehicle, so that the heating unit 2 works in the optimal state. For example, at low temperatures, before the engine is started, the control voltage may be increased to achieve a rapid warm-up; after the fuel rail is started and warmed up, after the temperature of the fuel in the fuel rail body 1 reaches a second threshold value, the voltage can be properly reduced, so that the load of a battery and the interference on peripheral electronic parts are reduced; after warming up, the fuel atomization quality is greatly improved, and low voltage can be used for heat preservation; if further heating of the fuel is not required, the control circuit can be turned off and the fuel supply can be turned into an off mode to reduce power consumption.
To sum up, the oil rail heating system that this application embodiment provided, according to different external environment and service condition demand formulate control strategy in advance, then utilize the heating control unit to match and carry out corresponding control strategy according to the current state of vehicle (including the temperature of vehicle present environment, fuel temperature and engine coolant temperature), make the heating unit adopt different mode to heat the oil rail body under different operating modes, thereby the evaporation performance and the atomizing quality of fuel under the low temperature condition have been improved, make the fuel easily lighted, the problem of engine cold start difficulty has been solved, simultaneously because the fuel can more fully burn, effectively reduced the production of harmful emission, reduced the oil consumption, reduced the carbon deposition of part in the cylinder, air intake manifold and cylinder wet wall phenomenon and the engine oil dilution phenomenon have been improved. The heating unit that this application embodiment provided has heating, keeps warm, closes three kinds of mode, simple structure, easy to carry out, need not change or destroy current oil rail structural design, and application scope is wide.
The embodiment of the present application further provides an oil rail heating method, and an execution main body of the method may be the oil rail heating system, the heating Control Unit, or even an Electronic Control Unit (ECU) of a vehicle. The method for heating an oil rail provided by the embodiment of the present application is described below by taking an example in which the execution main body is a heating control unit.
The oil rail heating method provided by the embodiment of the application comprises the following steps:
step 201, obtaining an ambient temperature.
Under the condition of low temperature, the viscosity and density of the fuel are increased, the evaporability is poor, and the atomization effect is poor after injection, so that most of the fuel exists in a cylinder in a liquid state, on one hand, the wet walls of an intake manifold, a cylinder barrel, a piston and the like are easy to be serious, the oil consumption is increased, and the economy is influenced; on the other hand, the fuel is difficult to mix with air, which causes the over-lean mixed gas which actually participates in combustion, is difficult to catch fire, and makes the engine difficult to start. Moreover, the fuel cannot be fully combusted, and the emission is overproof, the environment is polluted, excessive carbon deposition is generated, and partial parts cannot be normally used.
Based on the above characteristics of the fuel, when the method for heating the oil rail provided by the embodiment of the application is executed, the ambient temperature needs to be acquired first. The current ambient temperature of the environment can be detected by the first sensor.
The first sensor is electrically connected with the heating control unit and sends the acquired ambient temperature signal to the heating control unit in real time.
The heating control unit can judge the magnitude relation between the acquired environmental temperature and the first threshold value, and controls the heating unit to enter a corresponding working mode according to a preset control strategy. Wherein, when the ambient temperature is higher than the first threshold, step 202 is executed; when the ambient temperature is lower than the first threshold, step 203 is performed.
Step 202, controlling the heating unit in an off mode when the ambient temperature is higher than a first threshold.
When the ambient temperature is higher than the first threshold, it is indicated that the atomization performance of the fuel is still acceptable at the temperature, the fuel is easy to ignite, and the engine can be smoothly started, so that the heating unit is in a closed mode without heating the oil rail body and the fuel. In the off mode, the heating unit does not work and does not output heat to the oil rail body and the fuel, and the oil rail body and the fuel naturally dissipate heat at the moment. Wherein the first threshold is determined based on the characteristic of the fuel, and the atomization quality of the fuel is poor when the ambient temperature is lower than the first threshold, and the first threshold may be, for example, between-20 ℃ and-30 ℃.
And step 203, controlling the heating unit to be in a heating mode when the ambient temperature is lower than the first threshold value.
When the ambient temperature is lower than the first threshold value, the heating control unit controls the heating unit to be in a heating mode, and the heating unit continuously works in the heating mode to output heat to the oil rail body and the fuel so as to increase the temperature of the oil rail body and the fuel. The heating element in the heating unit is a thermistor, and the thermistor is attached to the outer wall of the oil rail body. The thermistor is a negative temperature coefficient thermistor (NTC), i.e. the higher the temperature, the lower the resistance of the thermistor. Before heating, the temperature of the thermistor is approximately the same as the ambient temperature, so that the resistance value of the thermistor is larger at the moment, and after the heating mode is started, the heating power is large, and the rapid temperature rise can be realized.
In the heating mode, the fuel temperature needs to be judged, and the control strategy of the next step is determined according to the current fuel temperature.
And step 204, acquiring the resistance value of the thermistor.
The resistance value of the thermistor and the fuel temperature have a corresponding relation, the heating control unit can obtain the current resistance value of the thermistor by obtaining the current voltage loaded to the thermistor and the current passing through the thermistor, and then the temperature corresponding to the current resistance value can be found in a resistance value-temperature relation corresponding table of the thermistor through a table look-up method, wherein the temperature is the fuel temperature. The fuel temperature is reflected by the resistance value of the thermistor.
If the resistance value of the thermistor is higher than the second threshold, go to step 205; if the resistance of the thermistor is lower than the second threshold, step 206 is executed.
And step 205, if the resistance value of the thermistor is higher than the second threshold value, controlling the heating unit to keep the current heating mode.
In the temperature rise process of the heating unit, the resistance value of the thermistor is continuously reduced, and if the resistance value of the thermistor is higher than a second threshold value, the temperature of the fuel is still not high enough at the moment, the evaporation performance is still poor, and the heating is still required to be continuously carried out in the current heating mode. The second threshold is determined based on the characteristic of the fuel, and when the resistance value of the thermistor is lower than the second threshold, the temperature of the fuel is higher, the pressure is too high, and danger is easy to occur. Generally, the second threshold corresponds to a temperature higher than the first threshold.
And step 206, if the resistance value of the thermistor is lower than a second threshold value, acquiring the temperature of the engine coolant.
When the resistance value of the thermistor drops to the second threshold value, which shows that the fuel temperature is higher, the viscosity of the fuel is reduced, and the evaporation performance is greatly improved. It is next necessary to further determine the temperature condition of the engine coolant, and determine whether heating is to be continued based on the temperature of the engine coolant.
The engine coolant temperature can be collected by a second sensor, and the second temperature sensor can be located in the engine water jacket and electrically connected with the heating control unit, and is used for sending the collected engine coolant temperature to the heating control unit in real time, so that the heating control unit controls the working mode of the heating element according to a preset control strategy.
On the basis, if the engine coolant temperature is lower than the third threshold, step 207 is executed; if the engine coolant temperature is above the third threshold, step 208 is performed.
And step 207, if the temperature of the engine coolant is lower than a third threshold value, controlling the heating unit to be in a heat preservation mode.
When the temperature of the engine coolant is lower than a third threshold value, the fuel injection quantity of the fuel injector is large, the air-fuel ratio is not reasonable enough, the current temperature needs to be kept, and the temperature of the engine coolant is waited to be increased as soon as possible. At the moment, the heating unit is in a heat preservation mode, namely when the resistance value of the thermistor is smaller than a second threshold value, the resistance value of the thermistor is close to zero, and no heat is generated; when the resistance value of the thermistor is larger than the second threshold value, the resistance value of the thermistor is larger, and heat is generated to heat the oil rail body. In the warm-up mode, the current temperature of the oil rail body is usually higher than the ambient temperature. The third threshold is the temperature of the engine coolant under normal conditions, and when the temperature is lower than the third threshold, the fuel mixing effect is poor, the fuel consumption is increased, and the third threshold may be 80 ℃.
And step 208, if the temperature of the engine coolant is higher than a third threshold value, controlling the heating unit to be in a closing mode.
When engine coolant temperature was higher than the third threshold value, engine water temperature reached normal range this moment, and the fuel injection quantity is suitable, and the air-fuel ratio is reasonable, and the engine is in steady operation state, need not to heat for the oil rail body again, can control heating unit and be in the mode of closing, reduces the energy consumption.
To sum up, the oil rail heating method provided by the embodiment of the application makes control strategies according to different external environments and use condition requirements in advance, and then the heating control unit is used for matching and executing corresponding control strategies according to the current state of the vehicle (including the temperature of the environment where the vehicle is located, the fuel temperature and the temperature of engine cooling liquid), so that the heating unit adopts different working modes to heat the oil rail body under different working conditions, thereby improving the evaporation performance and the atomization quality of the fuel under the low-temperature condition, enabling the fuel to be easily ignited, and solving the problem of difficulty in cold start of the engine.
This application still provides a vehicle, and this vehicle has above-mentioned oil rail heating system to can realize under the low temperature condition to the heating of this internal fuel of oil rail body and oil rail, the fuel through the heating promotes from sprayer injection back atomizing quality, makes the cold startability of vehicle, fuel economy obtain promoting, combustion performance improves, has effectively avoided harmful substance to discharge, the in-cylinder carbon deposit phenomenon, has reduced the machine oil and has diluted the risk.
In this application, it should be understood that the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated.
The above description is only for facilitating the understanding of the technical solutions of the present application by those skilled in the art, and is not intended to limit the present application. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (5)
1. An oil rail heating system is characterized by comprising an oil rail body (1), a heating unit (2) and a heating control unit (3),
the heating unit (2) is a heating belt, the heating belt is attached to the outer wall of the oil rail body (1) and used for heating the oil rail body (1), and a negative temperature coefficient thermistor is arranged in a heating loop of the heating belt;
the heating control unit (3) is electrically connected with the heating unit (2), and the heating control unit (3) is configured to control the working mode of the heating unit (2) according to the ambient temperature, the fuel temperature and the engine coolant temperature, acquire the resistance value of the thermistor and obtain the fuel temperature based on the resistance value of the thermistor;
wherein when the ambient temperature is below a first threshold, the heating unit (2) is controlled to be in a heating mode, and in the heating mode:
if the resistance value of the thermistor is higher than a second threshold value, controlling the heating unit (2) to keep the current heating mode;
if the resistance value of the thermistor is lower than the second threshold value and the temperature of the engine coolant is lower than a third threshold value, controlling the heating unit (2) to be in a heat preservation mode;
and if the resistance value of the thermistor is lower than the second threshold value and the temperature of the engine coolant is higher than the third threshold value, controlling the heating unit (2) to be in a closing mode.
2. Oil rail heating system according to claim 1, characterized in that the system comprises a first temperature sensor and a second temperature sensor, both of which are electrically connected with the heating control unit (3);
the first temperature sensor is used for collecting an environment temperature signal and sending the environment temperature signal to the heating control unit (3);
the second temperature sensor is used for collecting an engine coolant temperature signal and sending the engine coolant temperature signal to the heating control unit (3);
the heating control unit (3) is further configured to receive the ambient temperature signal and the engine coolant temperature signal.
3. A method of heating an oil rail, the method comprising the steps of:
acquiring ambient temperature, and when the ambient temperature is lower than a first threshold value, controlling a heating unit (2) to be in a heating mode, wherein the heating unit (2) is a heating belt, the heating belt is attached to the outer wall of an oil rail body (1) and used for heating the oil rail body (1), and a heating loop of the heating belt is provided with a negative temperature coefficient thermistor;
acquiring the resistance value of the thermistor;
in the heating mode, if the resistance value of the thermistor is higher than a second threshold value, controlling the heating unit (2) to keep the current heating mode;
and if the resistance value of the thermistor is lower than the second threshold value, acquiring the temperature of the engine coolant, wherein,
controlling the heating unit (2) in a keep warm mode when the engine coolant temperature is below a third threshold;
controlling the heating unit (2) in a shut-down mode when the engine coolant temperature is above a third threshold.
4. The method of claim 3, wherein after obtaining the ambient temperature, the method further comprises:
controlling the heating unit (2) in an off mode when the ambient temperature is above a first threshold.
5. A vehicle, characterized in that the vehicle is provided with an oil rail heating system according to any one of claims 1-2.
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| CN202011548189.XA CN112664366B (en) | 2020-12-24 | 2020-12-24 | Oil rail heating system and method and vehicle |
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| CN113063602B (en) * | 2021-04-30 | 2023-05-16 | 中国第一汽车股份有限公司 | Low-temperature cold start oil injection test evaluation method for direct injection gasoline engine bench |
| CN113202670B (en) * | 2021-05-14 | 2022-07-12 | 奇瑞汽车股份有限公司 | Heating method, device, equipment and storage medium for fuel oil rail |
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| FR2596811B1 (en) * | 1986-04-07 | 1990-10-12 | Grenet Edouard | FUEL DEFIGETING PROCESS AND DEVICE |
| JP3692025B2 (en) * | 2000-11-08 | 2005-09-07 | トヨタ自動車株式会社 | Control method for shutoff of heater for fuel injection valve |
| CN201925055U (en) * | 2010-08-16 | 2011-08-10 | 北汽福田汽车股份有限公司 | Fuel heating device for gasoline engine |
| CN104454258A (en) * | 2014-10-27 | 2015-03-25 | 安徽江淮汽车股份有限公司 | Alcohol fuel cylinder preheating independent control method and system |
| US20120298078A1 (en) * | 2011-05-24 | 2012-11-29 | Wen-Chen Wu | Method of Using Fuel in Transportation Means for Reduction of Fuel Consumption and Carbon Emission |
| CN102852691B (en) * | 2012-09-05 | 2015-02-25 | 安徽江淮汽车股份有限公司 | Cold start method and system for flexible fuel vehicle |
| CN105257437B (en) * | 2015-06-26 | 2018-07-06 | 杨记 | A kind of method and apparatus for promoting motor vehicle fuel thermal effect |
| CN107013395A (en) * | 2017-04-24 | 2017-08-04 | 浙江吉利控股集团有限公司 | A kind of vehicle motor activation system and method |
| CN111608825A (en) * | 2019-02-26 | 2020-09-01 | 上汽通用汽车有限公司 | Fuel heating device, fuel heating control method, engine fuel system and vehicle |
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