Environmental self-detection method, device, system and automobile based on fuel cell system

Abstract

The embodiments of the present invention provide an environmental self-detection method based on a fuel cell system, an environmental self-detection device based on a fuel cell system, an environmental self-detection system based on a fuel cell system, and an automobile, and relate to the field of fuel cell technology. The method includes: obtaining a first pressure value of a coolant circuit and a first speed of a cooling water pump; obtaining a first calibrated pressure value corresponding to the first speed, the first calibrated pressure value being the pressure value corresponding to the coolant circuit at the first speed under preset conditions; calculating a first difference between the first pressure value and the first calibrated pressure value; and using a first altitude corresponding to the first difference at the first speed as the current altitude. The present invention can effectively detect parameters such as external environmental pressure changes and operating altitude without adding additional environmental pressure sensors.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to an environmental self-detection method based on a fuel cell system, an environmental self-detection device based on a fuel cell system, an environmental self-detection system based on a fuel cell system, and a vehicle. Background Art

[0002] The fuel cell system is mainly composed of a stack, hydrogen, air, coolant circuit and electrical parts. The matching of each part helps the fuel cell system to operate in a suitable working environment while meeting the needs of the whole vehicle. However, at present, in order to detect whether the fuel cell system can still match the suitable working range of the stack in a complex external environment, an environmental pressure sensor is often added to the vehicle to detect the change of environmental pressure. However, artificially adding sensors involves additional costs and will cause problems such as non-compact layout space and EMC electromagnetic interference. Summary of the invention

[0003] The purpose of the embodiments of the present invention is to provide a method, device, system and automobile for self-detection of the environment based on a fuel cell system, so as to solve the problem that the existing fuel cell system needs to artificially add sensors to detect the external environment.

[0004] In order to achieve the above-mentioned object, in a first aspect of the present invention, there is provided an environmental self-detection method based on a fuel cell system, wherein the fuel cell system comprises a coolant circuit for cooling a fuel cell stack and an overflow tank connected to the coolant circuit, wherein the coolant circuit comprises a cooling water pump for driving the coolant to circulate in the coolant circuit, and the method comprises:

[0005] When the overflow tank is connected to the atmosphere:

[0006] Acquiring a first pressure value in the coolant circuit and a first speed of the cooling water pump;

[0007] Acquire a first calibrated pressure value corresponding to the first speed, the first calibrated pressure value being a pressure value of the coolant circuit corresponding to the first speed under preset conditions;

[0008] Calculating a first difference between the first pressure value and the first calibrated pressure value;

[0009] A first altitude corresponding to the first difference at the first speed is taken as the current altitude.

[0010] Optionally, the preset condition is an altitude zero point or a standard atmospheric pressure value.

[0011] Optionally, the cooling water pump drives the coolant to flow in from the water inlet of the fuel cell stack and out from the water outlet of the fuel cell stack; the first pressure value and the first calibrated pressure value are both pressure values ​​at the water inlet of the fuel cell stack.

[0012] Optionally, obtaining a first calibrated pressure value corresponding to the first rotation speed includes:

[0013] The first calibrated pressure value corresponding to the first rotational speed is determined by a first relationship table or a first fitting curve, wherein the first relationship table or the first fitting curve has at least the first calibrated pressure values ​​corresponding to different rotational speeds of the cooling water pump under the preset conditions.

[0014] Optionally, taking a first altitude corresponding to the first difference at the first speed as the current altitude includes:

[0015] Determine a first altitude corresponding to the first difference through a second relationship table or a second fitting curve, and use the first altitude as the current altitude, wherein the second relationship table or the second fitting curve has at least an altitude corresponding to a difference between a second calibrated pressure value corresponding to the coolant circuit at different atmospheric pressure values ​​at the same speed of the cooling water pump and a reference calibrated pressure value corresponding to the current speed;

[0016] The reference calibrated pressure value corresponding to the current rotation speed is the pressure value corresponding to the coolant circuit under the current rotation speed of the cooling water pump and the preset conditions.

[0017] In a second aspect of the present invention, there is provided an environmental self-detection method based on a fuel cell system, wherein the fuel cell system comprises a coolant circuit for cooling a fuel cell stack and an overflow tank connected to the coolant circuit, wherein the coolant circuit comprises a cooling water pump for driving the coolant to circulate in the coolant circuit, wherein the method comprises:

[0018] When the overflow tank is connected to the atmosphere:

[0019] Acquiring a second pressure value in the coolant circuit and a second speed of the cooling water pump;

[0020] A second altitude corresponding to the second pressure value at the second speed is used as the current altitude.

[0021] Optionally, taking a second altitude corresponding to the second pressure value at the second speed as the current altitude includes:

[0022] Determine the atmospheric pressure value corresponding to the second pressure value through a third relationship table or a third fitting curve, determine the second altitude corresponding to the atmospheric pressure value corresponding to the second pressure value through a fourth relationship table or a fourth fitting curve, and use the second altitude as the current altitude;

[0023] Among them, the third relationship table or the third fitting curve at least has the pressure value in the coolant circuit corresponding to different atmospheric pressure values ​​at a certain speed of the cooling water pump; the fourth relationship table or the fourth fitting curve at least has the altitude corresponding to different atmospheric pressure values.

[0024] In a third aspect of the present invention, there is provided an environment self-detection device based on a fuel cell system, applying the above-mentioned environment self-detection method based on a fuel cell system, the device comprising:

[0025] A first data acquisition module is configured to acquire a first pressure value in the coolant circuit and a first speed of the cooling water pump;

[0026] A second data acquisition module is configured to acquire a first calibrated pressure value corresponding to the first speed, wherein the first calibrated pressure value is a pressure value of the coolant circuit corresponding to the first speed under preset conditions;

[0027] A first calculation module is configured to calculate a first difference between the first pressure value and the first calibrated pressure value;

[0028] The second calculation module is configured to use a first altitude corresponding to the first difference at the first rotation speed as a current altitude.

[0029] In a fourth aspect of the present invention, there is provided an environmental self-detection system based on a fuel cell system, comprising:

[0030] The above-mentioned environmental self-detection device based on the fuel cell system;

[0031] A pressure sensor for detecting a pressure value in the coolant circuit; and

[0032] A rotation speed sensor is used to detect the rotation speed of the cooling water pump.

[0033] In a fifth aspect of the present invention, there is provided an automobile comprising the above-mentioned fuel cell system-based environmental self-detection system.

[0034] The above technical solution of the present invention utilizes the accurate coolant circuit pressure value collected by the fuel cell system's own sensor to obtain the corresponding ambient absolute pressure, and obtains the corresponding altitude based on the ambient absolute pressure, thereby effectively detecting external ambient pressure changes and operating altitude and other parameters without adding additional ambient pressure sensors.

[0035] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0037] Figure 1 is a method flow chart of an environmental self-detection method based on a fuel cell system provided in a preferred embodiment of the present invention;

[0038] Figure 2 is a schematic diagram of the structure of a fuel cell system provided by a preferred embodiment of the present invention;

[0039] Figure 3 It is a device structure block diagram of an environmental self-detection device based on a fuel cell system provided in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0040] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0041] like Figure 1 As shown, in a first aspect of the present invention, a method for self-detection of an environment based on a fuel cell system is provided, wherein the fuel cell system comprises a coolant circuit for cooling a fuel cell stack and an overflow tank connected to the coolant circuit, wherein the coolant circuit comprises a cooling water pump for driving the coolant to circulate in the coolant circuit, as shown in FIG. Figure 2 As shown, the method includes, when the overflow tank is connected to the atmosphere:

[0042] S100, obtaining a first pressure value in a coolant circuit and a first speed of a cooling water pump;

[0043] S200, obtaining a first calibrated pressure value corresponding to a first speed, the first calibrated pressure value being a pressure value of a coolant circuit corresponding to the first speed under preset conditions;

[0044] S300, calculating a first difference between a first pressure value and a first calibrated pressure value;

[0045] S400: Taking a first altitude corresponding to the first difference at a first rotation speed as a current altitude.

[0046] This embodiment uses the accurate coolant circuit pressure value collected by the fuel cell system's own sensor to obtain the corresponding ambient absolute pressure, and obtains the corresponding altitude based on the ambient absolute pressure, thereby effectively detecting external ambient pressure changes and operating altitude and other parameters without adding additional ambient pressure sensors.

[0047] Specifically, the output capacity of the fuel cell system is directly related to the power performance and safety performance of the whole vehicle, among which the stability of the fuel cell stack is the key to maintaining the output capacity of the fuel cell system. However, the performance of the fuel cell stack is very sensitive to air pressure, excess coefficient, etc., especially under high power output conditions, the performance of the fuel cell requires an appropriate air control strategy to ensure the stability of the fuel cell performance, especially in high altitude areas, due to the thin air and low air pressure, it may cause the fuel cell stack cathode to be short of gas, the single chip voltage is too low, and other problems. If the air control strategy is not adjusted according to the external environment in time, it will affect the output capacity and life of the fuel cell. Therefore, real-time detection of the external environment of the vehicle is conducive to timely adjustment of the air control strategy, thereby maintaining the stability of the performance of the fuel cell. In the existing fuel cell system, the coolant circuit includes a cooling water pump, a stack, a thermostat, a radiator and a pressure sensor connected in sequence. At the same time, an overflow tank is connected to the coolant circuit, and the coolant in the cooling water pump drive circuit circulates in the circuit to cool the stack. In the existing fuel cell system, the overflow tank usually has a steam valve with a certain opening pressure. When the pressure in the coolant circuit is too high, the steam valve of the overflow tank opens so that the gas in the circuit can be discharged smoothly, thereby maintaining the pressure in the circuit stable. The overflow tank of the present embodiment is a normal pressure open overflow tank, that is, the valve of the overflow tank is kept open, so that the coolant circuit can be directly connected to the external atmosphere, thereby eliminating the pressure change in the coolant circuit due to temperature change. On this basis, the pressure change in the coolant circuit is only related to the water pump speed and the external environmental pressure, and the external environmental pressure is directly related to the altitude. Therefore, through the improvement of the fuel cell system, the present embodiment can, without adding an additional environmental pressure sensor, pre-calibrate the first calibrated pressure value in the coolant circuit corresponding to the cooling water pump at different speeds under a certain preset condition, and calibrate the difference between the pressure in the coolant circuit and the first calibrated pressure value at each different speed, that is, at different atmospheric pressure environments, at different altitudes, i.e., the pressure in the coolant circuit at the same speed at different altitudes is associated with the difference between the first calibrated pressure value, that is, the altitude corresponding to the first difference can be obtained according to the first difference between the first pressure value and the first calibrated pressure value obtained in real time, and the altitude is the altitude of the current environment.

[0048] The preset condition is the zero point above sea level or the standard atmospheric pressure value, that is, the first calibrated pressure value corresponding to each speed is calibrated at sea level or when the atmospheric pressure is 101.325 kpa as a calculation basis.

[0049] In the coolant circuit, the cooling water pump drives the coolant to flow in from the water inlet of the fuel cell stack and flow out from the water outlet of the fuel cell stack. In order to further ensure the accuracy of pressure detection in the coolant circuit, in this embodiment, the first pressure value and the first calibrated pressure value are both the pressure values ​​at the water inlet of the fuel cell stack.

[0050] Wherein, obtaining a first calibrated pressure value corresponding to the first rotation speed includes:

[0051] The first calibrated pressure value corresponding to the first speed is determined by a first relationship table or a first fitting curve, wherein the first relationship table or the first fitting curve has at least the first calibrated pressure values ​​corresponding to different speeds of the cooling water pump under preset conditions. For example, a relationship table is pre-established for the first calibrated pressure value P1 corresponding to the coolant circuit when the speed is V1 and the atmospheric pressure is the standard atmospheric pressure, the first calibrated pressure value P2 corresponding to the coolant circuit when the speed is V2 and the atmospheric pressure is the standard atmospheric pressure, and the first calibrated pressure value Pn corresponding to the coolant circuit when the speed is Vn and the atmospheric pressure is the standard atmospheric pressure, and is stored in a memory so that relevant data can be read therefrom when the method of this embodiment is executed.

[0052] Similarly, taking the first altitude corresponding to the first difference at the first speed as the current altitude includes:

[0053] The first altitude corresponding to the first difference is determined by a second relationship table or a second fitting curve, and the first altitude is used as the current altitude, wherein the second relationship table or the second fitting curve has at least an altitude corresponding to the difference between a second calibrated pressure value corresponding to the coolant circuit of the cooling water pump at different atmospheric pressure values ​​at the same speed and a reference calibrated pressure value corresponding to the current speed; the reference calibrated pressure value corresponding to the current speed is a pressure value corresponding to the coolant circuit of the cooling water pump at the current speed and preset conditions.

[0054] For example, the altitude H1 corresponding to the atmospheric pressure AP1 is pre-calibrated, and the second calibration pressure value p1 corresponding to the coolant circuit when the speed of the cooling water pump is V1 and the atmospheric pressure is AP1, and the reference calibration pressure value BP1 in the coolant circuit when the speed is V1 and the atmospheric pressure is the standard atmospheric pressure, the difference ΔP1 between p1 and BP1 is calculated, and the corresponding relationship of ΔP1-AP1-H1 is established. Similarly, the corresponding relationship of ΔPn-APn-Hn is established. Based on all the established corresponding relationships, a second relationship table is constructed and stored in the memory. In this way, After obtaining the first pressure value of the coolant circuit and the current speed of the cooling water pump in real time, read the corresponding first calibrated pressure value in the first relationship table, thereby calculating the first difference, matching the first difference with the second relationship table, and obtaining the altitude of the current environment, and then accurately detecting the current external altitude without adding an external environment sensor. The altitude can be further corresponded to the atmospheric pressure, so that the air control strategy of the fuel cell system can be adjusted in real time with the altitude or atmospheric pressure as an input parameter to ensure the stability of the performance of the fuel cell system. In order to reduce the amount of calculation, when calibrating the second relationship table, a reasonable range can be given for the difference between the second calibrated pressure value corresponding to the coolant circuit and the reference calibrated pressure value corresponding to the current speed. For example, when the first difference obtained in real time is within the range of ΔP1±x, it is considered that the first difference matches ΔP1.

[0055] In a second aspect of this embodiment, there is provided an environmental self-detection method based on a fuel cell system, wherein the fuel cell system comprises a coolant circuit for cooling a fuel cell stack and an overflow tank connected to the coolant circuit, wherein the coolant circuit comprises a cooling water pump for driving the coolant to circulate in the coolant circuit, and the method comprises:

[0056] When the overflow tank is connected to the atmosphere:

[0057] A second pressure value in the coolant circuit and a second speed of the cooling water pump are obtained; and a second altitude corresponding to the second pressure value at the second speed is used as the current altitude.

[0058] The second altitude corresponding to the second pressure value at the second speed is used as the current altitude, including:

[0059] The atmospheric pressure value corresponding to the second pressure value is determined by a third relationship table or a third fitting curve, and the second altitude corresponding to the atmospheric pressure value corresponding to the second pressure value is determined by a fourth relationship table or a fourth fitting curve, and the second altitude is used as the current altitude; wherein the third relationship table or the third fitting curve has at least pressure values ​​in the coolant circuit corresponding to different atmospheric pressure values ​​at a certain speed of the cooling water pump; and the fourth relationship table or the fourth fitting curve has at least altitudes corresponding to different atmospheric pressure values.

[0060] In this way, by pre-calibrating the corresponding relationship between each atmospheric pressure value and the second pressure value in the coolant circuit when the speed of the cooling water pump is a certain speed and the external environment is different atmospheric pressures, as well as the corresponding relationship between each atmospheric pressure value and the altitude, the altitude corresponding to the second pressure value in the current coolant circuit at a certain speed can be quickly obtained. For example, when the speed is V1 and the external atmospheric pressure is AP1, the second pressure value in the coolant circuit is PA1 at this time. When the speed is V1 and the external atmospheric pressure is AP2, the second pressure value in the coolant circuit is PA2 at this time. By analogy, the corresponding relationship between the external atmospheric pressure and the second pressure value when the speed is Vn is established, thereby constructing a third relationship table. In this way, through the third relationship table and the fourth relationship table, the second pressure value is corresponded to the altitude, and the altitude and atmospheric pressure of the current external environment can be quickly obtained.

[0061] like Figure 3 As shown, in a third aspect of this embodiment, an environment self-detection device based on a fuel cell system is also provided, and the environment self-detection method based on a fuel cell system is applied, and the device includes:

[0062] A first data acquisition module is configured to acquire a first pressure value in a coolant circuit and a first speed of a cooling water pump;

[0063] A second data acquisition module is configured to acquire a first calibrated pressure value corresponding to the first speed, the first calibrated pressure value being a pressure value of the coolant circuit corresponding to the first speed under preset conditions;

[0064] A first calculation module is configured to calculate a first difference between a first pressure value and a first calibrated pressure value;

[0065] The second calculation module is configured to use a first altitude corresponding to the first difference at a first rotation speed as a current altitude.

[0066] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0067] In a fourth aspect of this embodiment, there is also provided an environment self-detection system based on a fuel cell system, comprising:

[0068] The above-mentioned environmental self-detection device based on the fuel cell system;

[0069] A pressure sensor for detecting a pressure value in a coolant circuit; and

[0070] A rotation speed sensor is used to detect the rotation speed of the cooling water pump.

[0071] In a fifth aspect of the present embodiment, there is also provided an automobile, comprising the above-mentioned fuel cell system-based environmental self-detection system.

[0072] To summarize, the present embodiment utilizes the fuel cell system's own sensors to collect the real-time pressure value of the coolant circuit. By keeping the overflow tank in the open state at normal pressure, the pressure in the coolant circuit is only affected by the cooling water pump speed and the atmospheric pressure. A corresponding relationship between the real-time pressure value and the altitude, the atmospheric pressure and the cooling water pump speed is established. Thus, the current environmental altitude and atmospheric pressure can be accurately obtained based only on the cooling water pump speed and the real-time pressure of the coolant circuit. There is no need to add an additional environmental pressure sensor. In the case of limited internal layout space in the current vehicle, the use of system layout space can be effectively reduced, saving internal layout space in the vehicle. At the same time, it can reduce system electromagnetic interference, improve the degree of system integration, and save costs.

[0073] The optional embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

[0074] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0075] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed in the embodiments of the present invention.

Claims

1. An environmental self-detection method based on a fuel cell system, wherein the fuel cell system comprises a coolant circuit for cooling a fuel cell stack and an overflow tank connected to the coolant circuit, wherein the coolant circuit comprises a cooling water pump for driving the coolant to circulate in the coolant circuit, characterized in that: The method comprises: When the overflow tank is connected to the atmosphere: Acquiring a first pressure value in the coolant circuit and a first speed of the cooling water pump; Determine a first calibrated pressure value corresponding to the first speed through a first relationship table or a first fitting curve, wherein the first relationship table or the first fitting curve has at least first calibrated pressure values ​​corresponding to different speeds of the cooling water pump under preset conditions, and the first calibrated pressure value is a pressure value of the coolant circuit corresponding to the first speed under the preset conditions; Calculating a first difference between the first pressure value and the first calibrated pressure value; The first altitude corresponding to the first difference is determined by a second relationship table or a second fitting curve, and the first altitude is used as the current altitude, wherein the second relationship table or the second fitting curve has at least an altitude corresponding to the difference between the second calibrated pressure value corresponding to the coolant circuit at different atmospheric pressure values ​​at the same speed of the cooling water pump and the reference calibrated pressure value corresponding to the current speed, and the reference calibrated pressure value corresponding to the current speed is the pressure value corresponding to the coolant circuit of the cooling water pump at the current speed and the preset conditions.

2. The method for self-detection of the environment based on the fuel cell system according to claim 1, characterized in that: The preset condition is the zero point above sea level or the standard atmospheric pressure value.

3. The method for environmental self-detection based on a fuel cell system according to claim 1, characterized in that: The cooling water pump drives the coolant to flow into the water inlet of the fuel cell stack and flow out of the water outlet of the fuel cell stack; the first pressure value and the first calibrated pressure value are both pressure values ​​at the water inlet of the fuel cell stack.

4. An environmental self-detection method based on a fuel cell system, wherein the fuel cell system comprises a coolant circuit for cooling a fuel cell stack and an overflow tank connected to the coolant circuit, wherein the coolant circuit comprises a cooling water pump for driving the coolant to circulate in the coolant circuit, characterized in that: The method comprises: When the overflow tank is connected to the atmosphere: Acquiring a second pressure value in the coolant circuit and a second speed of the cooling water pump; Determine the atmospheric pressure value corresponding to the second pressure value through a third relationship table or a third fitting curve, determine the second altitude corresponding to the atmospheric pressure value corresponding to the second pressure value through a fourth relationship table or a fourth fitting curve, and use the second altitude as the current altitude; Among them, the third relationship table or the third fitting curve at least has the pressure value in the coolant circuit corresponding to different atmospheric pressure values ​​at a certain speed of the cooling water pump; the fourth relationship table or the fourth fitting curve at least has the altitude corresponding to different atmospheric pressure values.

5. An environmental self-detection device based on a fuel cell system, applying the environmental self-detection method based on a fuel cell system according to any one of claims 1 to 3, characterized in that: The device comprises: A first data acquisition module is configured to acquire a first pressure value in the coolant circuit and a first speed of the cooling water pump; A second data acquisition module is configured to determine a first calibrated pressure value corresponding to the first speed through a first relationship table or a first fitting curve, wherein the first relationship table or the first fitting curve has at least first calibrated pressure values ​​corresponding to different speeds of the cooling water pump under preset conditions, and the first calibrated pressure value is a pressure value of the coolant circuit corresponding to the first speed under the preset conditions; A first calculation module is configured to calculate a first difference between the first pressure value and the first calibrated pressure value; The second calculation module is configured to determine the first altitude corresponding to the first difference through a second relationship table or a second fitting curve, and use the first altitude as the current altitude, wherein the second relationship table or the second fitting curve has at least the altitude corresponding to the difference between the second calibrated pressure value corresponding to the coolant circuit at different atmospheric pressure values ​​at the same speed of the cooling water pump and the reference calibrated pressure value corresponding to the current speed, and the reference calibrated pressure value corresponding to the current speed is the pressure value corresponding to the coolant circuit of the cooling water pump at the current speed and the preset conditions.

6. An environmental self-detection system based on a fuel cell system, characterized in that: include: The environmental self-detection device based on the fuel cell system as described in claim 5; A pressure sensor for detecting the pressure value in the coolant circuit; as well as A rotation speed sensor is used to detect the rotation speed of the cooling water pump.

7. A car, characterized in that: Including the fuel cell system-based environmental self-detection system as described in claim 6.

Images