阅读说明：本技术 用于燃料电池系统的电子节温器控制方法及燃料电池系统 (Electronic thermostat control method for fuel cell system and fuel cell system ) 是由 宋亚召 原瑞 崔欢 于 2020-03-27 设计创作，主要内容包括：本发明公开了一种用于燃料电池系统的电子节温器控制方法及燃料电池系统,电子节温器的控制方法包括：S1：根据燃料电池的需求功率确定冷却液设定温度；S2：根据实际冷却液温度与所述冷却液设定温度的差值确定第一节温器开度变化速率；根据冷却液温度变化速率确定第二节温器开度变化速率；S3：根据所述第一节温器开度变化速率和所述第二节温器开度变化速率控制确定实际节温器开度变化速率。根据本发明的电子节温器的控制方法可以根据实际的冷却液温度变化情况对电子节温器的开度进行调节,冷却系统的稳定性好,响应速率快,不会引起系统震荡。(The invention discloses a control method of an electronic thermostat for a fuel cell system and the fuel cell system, wherein the control method of the electronic thermostat comprises the following steps: s1: determining a coolant set temperature according to the required power of the fuel cell; s2: determining the opening change rate of a first thermostat according to the difference between the actual temperature of the cooling liquid and the set temperature of the cooling liquid; determining the change rate of the opening of the second thermostat according to the temperature change rate of the cooling liquid; s3: and controlling and determining the actual opening change rate of the thermostat according to the opening change rate of the first thermostat and the opening change rate of the second thermostat. According to the control method of the electronic thermostat, the opening of the electronic thermostat can be adjusted according to the actual temperature change condition of the cooling liquid, the cooling system is good in stability and high in response speed, and system oscillation cannot be caused.)

1. A control method for an electronic thermostat of a fuel cell system, comprising:

s1: determining a coolant set temperature according to the required power of the fuel cell;

s2: determining the opening change rate of a first thermostat according to the difference between the actual temperature of the cooling liquid and the set temperature of the cooling liquid; determining the change rate of the opening of the second thermostat according to the temperature change rate of the cooling liquid;

s3: and controlling and determining the actual opening change rate of the thermostat according to the opening change rate of the first thermostat and the opening change rate of the second thermostat.

2. The control method for an electronic thermostat of a fuel cell system according to claim 1, characterized in that the first thermostat opening change rate is obtained in a temperature difference versus thermostat opening change rate curve from a difference between an actual coolant temperature and the coolant set temperature, and the second thermostat opening change rate is obtained in a coolant temperature change rate versus thermostat opening change rate curve from a coolant temperature change rate.

3. The control method for an electronic thermostat of a fuel cell system according to claim 1, characterized in that the actual thermostat opening change rate is obtained by weighting the first thermostat opening change rate and the second thermostat opening change rate.

4. The control method of an electronic thermostat for a fuel cell system according to claim 1, characterized by further comprising:

q1: determining the closing temperature and the full opening temperature of the electronic thermostat according to the required power of the fuel cell;

q2: and detecting the actual temperature of the cooling liquid, and determining the target opening degree of the electronic thermostat according to the actual temperature of the cooling liquid if the actual temperature of the cooling liquid is between the closing temperature and the full-opening temperature.

5. The control method for the electronic thermostat of a fuel cell system according to claim 4, characterized in that if the actual temperature of the coolant is between the off-temperature and the full on-temperature, the target opening degree of the electronic thermostat is obtained in a temperature and electronic thermostat opening degree variation curve based on the actual temperature of the coolant.

6. The control method for an electronic thermostat of a fuel cell system according to claim 5, characterized in that the electronic thermostat is opened from a current opening to the thermostat target opening at the actual thermostat opening change rate if the current opening of the electronic thermostat does not reach a target opening.

7. The control method of an electronic thermostat for a fuel cell system according to claim 3, characterized in that the electronic thermostat is completely turned off if the detected actual temperature of the coolant is less than a turn-off temperature of the electronic thermostat, and is completely turned on if the detected actual temperature of the coolant is greater than a full turn-on temperature of the electronic thermostat.

8. The control method for the electronic thermostat of a fuel cell system according to claim 1, characterized in that the coolant temperature change rate is a difference between a current water temperature and a coolant temperature one second before a current execution cycle.

9. The control method for an electronic thermostat of a fuel cell system according to claim 1, characterized in that the difference between the actual coolant temperature and the coolant set temperature is positively correlated with the first thermostat opening change rate, and the coolant temperature change rate is negatively correlated with the second thermostat opening change rate.

10. A fuel cell system, characterized by comprising: a method of controlling an electronic thermostat according to any of claims 1-9.

Technical Field

The invention relates to the field of fuel cells, in particular to an electronic thermostat control method for a fuel cell system and the fuel cell system.

Background

In the related art, for a vehicle using a fuel cell, the temperature of the fuel cell is regulated by a cooling system. The temperature of the cooling liquid in the cooling system is controlled by an electronic thermostat in the cooling system. The rate of change of the electronic thermostat opening affects the temperature change of the coolant. If the opening of the electronic thermostat changes too fast, the temperature of the cooling liquid changes too fast, which can cause the cooling system to vibrate. If the opening degree change speed is too slow, the response speed of the cooling system is slow, and the cooling system may have static difference.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a method for controlling an electronic thermostat of a fuel cell system, which can adjust the opening of the electronic thermostat according to the actual temperature change of the coolant, and has the advantages of good cooling system stability, fast response speed, and no system oscillation.

A control method for an electronic thermostat of a fuel cell system according to the present invention includes: s1: determining a coolant set temperature according to the required power of the fuel cell; s2: determining the opening change rate of a first thermostat according to the difference between the actual temperature of the cooling liquid and the set temperature of the cooling liquid; determining the change rate of the opening of the second thermostat according to the temperature change rate of the cooling liquid; s3: and controlling and determining the actual opening change rate of the thermostat according to the opening change rate of the first thermostat and the opening change rate of the second thermostat.

According to the control method of the thermostat for the fuel cell system, the set temperature of the cooling liquid is determined according to the required power of the fuel cell, the change rate of the opening of the first thermostat is determined according to the difference between the actual temperature of the cooling liquid and the set temperature of the cooling liquid, and the change rate of the second thermostat is determined according to the change rate of the temperature, so that the response speed of the electronic thermostat is considered, and the vibration of the cooling system caused by the too fast temperature change of the cooling liquid is avoided, so that the stability of the electronic thermostat is improved, and the cooling system is more reliable.

According to an embodiment of the present invention, the first thermostat opening rate of change is obtained in a temperature difference versus thermostat opening rate curve based on a difference between an actual coolant temperature and the coolant set temperature, and the second thermostat opening rate of change is obtained in a coolant temperature change rate versus thermostat opening rate curve based on a coolant temperature rate of change.

According to an embodiment of the present invention, the actual thermostat opening change rate is obtained by weighting the first thermostat opening change rate and the second thermostat opening change rate.

According to an embodiment of the present invention, the control method for an electronic thermostat of a fuel cell system further includes: q1: determining the closing temperature and the full opening temperature of the electronic thermostat according to the required power of the fuel cell; q2: and detecting the actual temperature of the cooling liquid, and determining the target opening degree of the electronic thermostat according to the actual temperature of the cooling liquid if the actual temperature of the cooling liquid is between the closing temperature and the full-opening temperature.

According to one embodiment of the present invention, a target opening of the electronic thermostat is obtained in a temperature and electronic thermostat opening variation curve based on an actual temperature of the coolant if the actual temperature of the coolant is between an off temperature and a full on temperature.

According to one embodiment of the present invention, if the current opening of the electronic thermostat does not reach a target opening, the electronic thermostat is opened from the current opening to the thermostat target opening at the actual thermostat opening rate of change.

According to one embodiment of the invention, the electronic thermostat is fully closed if the actual temperature of the coolant is detected to be less than the closed temperature of the electronic thermostat, and fully open if the actual temperature of the coolant is detected to be greater than the fully open temperature of the electronic thermostat.

According to one embodiment of the present invention, the coolant temperature change rate is a difference between the current water temperature and the coolant temperature one second before the current execution cycle.

According to one embodiment of the present invention, the difference between the actual coolant temperature and the coolant set temperature is positively correlated with the first thermostat opening change rate, and the coolant temperature change rate is negatively correlated with the second thermostat opening change rate.

The fuel cell system according to the present invention is briefly described below.

The fuel cell system can be applied to a vehicle, and the electronic thermostat is correspondingly arranged in a cooling system of the vehicle to regulate the temperature of the fuel cell.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a flowchart of a method for controlling an electronic thermostat according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

A control method of an electronic thermostat for a fuel cell system according to an embodiment of the invention is described below with reference to fig. 1.

The control method for the electronic thermostat according to the invention comprises the following steps: determining a coolant set temperature according to the required power of the fuel cell; determining the opening change rate of the first thermostat according to the difference between the actual temperature of the cooling liquid and the set temperature of the cooling liquid; determining the change rate of the opening of the second thermostat according to the temperature change rate of the cooling liquid; and controlling the actual opening change rate of the thermostat according to the opening change rate of the first thermostat and the opening change rate of the second thermostat.

The aperture change rate of electronic thermostat can produce great influence to vehicle cooling system's temperature, and the aperture change rate of if electronic thermostat can lead to the temperature variation of coolant liquid too fast to lead to cooling system vibrations, if the switching rate can lead to cooling system's response speed slow too slow, cooling system has the discrepancy.

The control method for the electronic thermostat of the fuel cell system according to the application firstly determines the set temperature of the cooling liquid according to the required power of the fuel cell, determines the on-off change rate of the first thermostat according to the difference between the actual temperature and the set temperature, and determines the change rate of the second thermostat according to the temperature change rate of the cooling liquid; it should be noted that the first thermostat rate of change and the second thermostat rate of change are both referred to as the same electronic thermostat, but are target rates of change derived from different factors.

After the first electronic thermostat change rate and the second electronic thermostat change rate are obtained, the actual thermostat opening change rate can be obtained for the two target rates through corresponding algorithms.

According to the control method of the thermostat for the fuel cell system, the set temperature of the cooling liquid is determined according to the required power of the fuel cell, the change rate of the opening of the first thermostat is determined according to the difference between the actual temperature of the cooling liquid and the set temperature of the cooling liquid, and the change rate of the second thermostat is determined according to the change rate of the temperature, so that the response speed of the electronic thermostat is considered, and the vibration of the cooling system caused by the too fast temperature change of the cooling liquid is avoided, so that the stability of the electronic thermostat is improved, and the cooling system is more reliable.

According to one embodiment of the present invention, a first thermostat opening rate of change is obtained in a temperature difference versus thermostat opening rate curve based on a difference between an actual coolant temperature and a coolant setpoint temperature, and a second thermostat opening rate of change is obtained in a coolant temperature change rate versus thermostat opening rate curve based on a coolant temperature rate of change.

It should be noted here that the "temperature difference versus thermostat opening rate curve" and the "coolant temperature change rate versus thermostat opening rate curve" are curves obtained by performing a plurality of tests on an actual cooling system. After a sensor of the cooling system detects the actual temperature, the corresponding first thermostat opening degree change rate can be found out according to the corresponding temperature difference and the thermostat opening degree change rate curve by calculating the difference value between the actual temperature and the set temperature; similarly, a second thermostat rate of change is found in a corresponding coolant temperature rate of change versus thermostat opening rate curve based on the coolant temperature rate of change.

According to the 'curve of the temperature difference and the opening change rate of the thermostat' and the 'curve of the temperature change rate of the cooling liquid and the opening change rate of the thermostat' calibrated by experiments, the opening change rate of the thermostat can be controlled more accurately, and the control stability and reliability of the electronic thermostat are improved.

According to one embodiment of the invention, the actual opening change rate is obtained after weighting the first thermostat opening change rate and the second thermostat opening change rate, and the actual opening change rate is finally obtained by respectively taking the first thermostat opening change rate and the second thermostat opening change rate as reference factors through corresponding weighting algorithms, so that the actual thermostat opening change rate can better adjust the thermostat opening.

According to an embodiment of the present invention, the control method for an electronic thermostat of a fuel cell system further includes Q1: determining the closing temperature and the full opening temperature of the electronic thermostat according to the required power of the fuel cell; q2: and detecting the actual temperature of the cooling liquid, and determining the target opening degree of the electronic thermostat according to the actual temperature of the cooling liquid if the actual temperature of the cooling liquid is between the closing temperature and the full-opening temperature. When the actual water temperature is between the closed temperature and the full open temperature, the thermostat is required to regulate the flow of the cooling liquid of the cooling system. The vehicle can quickly reach the optimal working temperature, and the working state of the vehicle is in the state with the highest working efficiency.

According to one embodiment of the invention, the target opening of the electronic thermostat is obtained from a temperature and electronic thermostat opening variation curve based on the actual temperature of the coolant if the actual temperature of the coolant is between the off temperature and the full on temperature. The change curve of the temperature and the opening degree of the electronic thermostat is obtained by calibrating according to experiments, the opening degree of the electronic thermostat is obtained according to the change curve of the temperature and the opening degree of the electronic thermostat, and the optimal opening degree of a vehicle at the corresponding temperature can be better confirmed through the change curve of the temperature and the opening degree of the electronic thermostat calibrated according to the experiments, so that the adjusting effect of the thermostat on a cooling system at the corresponding temperature is improved.

According to one embodiment of the invention, if the current opening of the electronic thermostat does not reach the target opening, the electronic thermostat is opened from the current opening to the target opening of the thermostat at the actual opening change rate of the thermostat, and the opening change rate of the electronic thermostat is changed in real time through the process of opening to the target opening at the actual opening change rate of the thermostat, so that system oscillation caused by too fast opening change rate is reduced, and the reliability of the whole vehicle is improved.

According to an embodiment of the present invention, the coolant temperature change rate is a difference between the current water temperature and the coolant temperature one second before the current real cycle, and of course, the detection period of the water temperature change rate can be adjusted according to actual conditions to meet the adjustment modes of the electronic thermostat in different systems.

According to one embodiment of the invention, the difference between the actual coolant temperature and the coolant setpoint temperature is positively correlated to the rate of change of the first thermostat opening and the rate of change of the coolant temperature is negatively correlated to the rate of change of the second thermostat opening. When the difference value between the actual cooling liquid temperature and the set temperature is larger, the response speed of the electronic thermostat which needs to be adjusted is higher, and when the difference value between the actual cooling liquid temperature and the set temperature is larger, the response speed of the electronic thermostat is higher, so that the static difference of the system is reduced; and the cooling temperature change rate is inversely related to the second thermostat opening change rate, so that the system oscillation caused by the rapid change of the system temperature due to the too fast change of the opening of the electronic thermostat can be avoided, the electronic thermostat is correspondingly adjusted according to the actual cooling liquid temperature change rate, the system oscillation caused by the too fast temperature change rate of the cooling liquid is avoided, and the stability of the whole system is improved.

The fuel cell system according to the present invention is briefly described below.

The fuel cell system can be applied to a vehicle, and the electronic thermostat is correspondingly arranged in a cooling system of the vehicle to regulate the temperature of the fuel cell.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features.

In the description of the present invention, "a plurality" means two or more.

In the description of the present invention, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween.

In the description of the invention, "above", "over" and "above" a first feature in a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.