Control method and device of hydrogen ejector, terminal equipment and storage medium

Abstract

The invention discloses a control method and device of a hydrogen ejector, terminal equipment and a storage medium. The control method of the hydrogen ejector comprises the steps that in the opening period, first driving current is provided for the hydrogen ejector so as to control an electromagnetic valve of the hydrogen ejector to be opened; in the closing period, second driving current is provided for the hydrogen ejector so as to control the electromagnetic valve of the hydrogen ejector to be closed; the maximum value of the second driving current is smaller than the maximum value of the first driving current. The opening period is used for meeting the requirement of engine torque for the hydrogen injection amount, and the closing period is used for slowing down return seating of the electromagnetic valve. According to the scheme, the impact force of the valve element when the electromagnetic valve of the hydrogen ejector is closed can be reduced, the slow seating effect of the electromagnetic valve is achieved, abrasion of the electromagnetic valve is reduced, the service life of a hydrogen burner is prolonged, and the durability and reliability of the hydrogen ejector are improved.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of automobile technology, and in particular to a control method, device, terminal equipment and storage medium for a hydrogen injector. Background Art

[0002] In the field of new energy, fuel cell vehicles use hydrogen as fuel. Hydrogen reacts chemically with oxygen in the air to convert chemical energy into electrical energy or kinetic energy, while generating water. Hydrogen fuel cell vehicles are considered to be an ideal solution to the energy crisis and environmental pollution caused by the development of automobiles due to their high efficiency, energy saving and zero emissions.

[0003] The hydrogen injector is an important actuator in a hydrogen fuel cell vehicle. The durability and reliability of the hydrogen injector directly affect the service life of the hydrogen engine. The hydrogen injector control method in the prior art is difficult to meet the requirements for the durability and reliability of the hydrogen injector. Summary of the invention

[0004] Based on the above-mentioned defects of the prior art, the embodiments of the present invention provide a control method, an apparatus, a terminal device and a storage medium for a hydrogen injector to improve the durability and reliability of the hydrogen injector.

[0005] In a first aspect, an embodiment of the present invention provides a control method for a hydrogen injector, wherein the hydrogen injector includes an opening period and a closing period, and at least one of the opening period and the closing period includes a plurality of sub-control stages; the control method includes:

[0006] During the opening period, a first driving current is provided to the hydrogen injector to control the solenoid valve of the hydrogen injector to open;

[0007] During the closing period, a second driving current is provided to the hydrogen injector to control the solenoid valve of the hydrogen injector to close; and a maximum value of the second driving current is smaller than a maximum value of the first driving current.

[0008] In a second aspect, an embodiment of the present invention further provides a control device for a hydrogen injector, which is used to execute a control method for a hydrogen injector provided in any embodiment of the present invention, and the control device includes:

[0009] The solenoid valve control module is used to provide a first driving current to the hydrogen injector during an opening period to control the solenoid valve of the hydrogen injector to open, and is also used to provide a second driving current to the hydrogen injector during a closing period to control the solenoid valve of the hydrogen injector to close; the maximum value of the second driving current is less than the maximum value of the first driving current.

[0010] In a third aspect, an embodiment of the present invention further provides a terminal device, including:

[0011] one or more processors;

[0012] A storage device for storing one or more programs;

[0013] The one or more programs are executed by the one or more processors, so that the one or more processors implement the control method of the hydrogen injector provided in the embodiment of the present invention.

[0014] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control method of the hydrogen injector provided by an embodiment of the present invention.

[0015] In the embodiment of the present invention, the hydrogen injector includes an opening period and a closing period, and at least one of the opening period and the closing period includes multiple sub-control stages. The control method of the hydrogen injector includes: in the opening period, providing a first driving current to the hydrogen injector to control the opening of the solenoid valve of the hydrogen injector; in the closing period, providing a second driving current to the hydrogen injector to control the closing of the solenoid valve of the hydrogen injector; the maximum value of the second driving current is less than the maximum value of the first driving current. The opening period is used to meet the engine torque demand for hydrogen injection amount, and the closing period is used to slow down the return of the solenoid valve. Through the above scheme, the impact of the valve core of the solenoid valve of the hydrogen injector when it is closed can be offset, and the impact force of the valve core when the solenoid valve is closed can be reduced, so as to achieve the effect of slow seating of the solenoid valve. Reduce the wear of the solenoid valve, extend the service life of the hydrogen burner, and improve the durability and reliability of the hydrogen injector. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic flow chart of a method for controlling a hydrogen injector provided in an embodiment of the present invention;

[0017] Figure 2 A waveform diagram of a driving current provided by an embodiment of the present invention;

[0018] Figure 3 A waveform diagram of a driving signal provided by an embodiment of the present invention;

[0019] Figure 4 Another driving current waveform diagram provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It is also necessary to explain that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0021] It should be mentioned before discussing exemplary embodiments in more detail that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe various operations (or steps) as sequential processes, many operations therein can be implemented in parallel, concurrently or simultaneously. In addition, the order of various operations can be rearranged. The process can be terminated when its operation is completed, but can also have additional steps not included in the accompanying drawings. The process can correspond to methods, functions, procedures, subroutines, subprograms, etc. In addition, the embodiments in the present invention and the features in the embodiments can be combined with each other without conflict.

[0022] The term “including” and its variations used in the present invention are open inclusions, that is, “including but not limited to.” The term “based on” means “based at least in part on.” The term “one embodiment” means “at least one embodiment.”

[0023] It should be noted that the concepts such as "first" and "second" mentioned in the present invention are only used to distinguish the corresponding contents, and are not used to limit the order or interdependence.

[0024] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0025] The control method of the hydrogen injector provided in an embodiment of the present invention is suitable for controlling the solenoid valve of the hydrogen injector. The method can be executed by a control device of the hydrogen injector, wherein the device can be implemented by software and / or hardware and is generally integrated on a terminal device. In this embodiment, the terminal device includes but is not limited to an engine controller, such as an electronic control unit (ECU) and other devices.

[0026] Figure 1 The present invention provides a flow chart of a control method for a hydrogen injector. In the present invention, the hydrogen injector includes an opening period and a closing period, and at least one of the opening period and the closing period includes multiple sub-control stages. Figure 1 As shown, a control method for a hydrogen injector provided in an embodiment of the present invention comprises the following steps:

[0027] S110 , in the opening period, providing a first driving current to the hydrogen injector to control the solenoid valve of the hydrogen injector to open.

[0028] The opening period and the closing period can be regarded as two control sub-processes performed sequentially in an injection process of the hydrogen injector. The control device may include a command issuing module and a solenoid valve control module. The command issuing module issues an injection command to the solenoid valve control module according to driving requirements. The solenoid valve control module provides a first driving current to the solenoid valve in response to the injection command. The first driving current is used to control the solenoid valve to open and maintain the open state.

[0029] Among them, the embodiment of the present invention proposes that at least one of the opening period and the closing period includes multiple sub-control stages. The hydrogen injector is a solenoid valve controlled injection device driven by current, and is generally controlled by a segmented current control strategy. The segmented current control strategy refers to using different currents to drive the solenoid valve in different sub-stages. The segmented current control strategy has the advantages of optimizing hydrogen utilization, reducing energy consumption, and improving system flexibility and stability.

[0030] For example, if the opening period includes multiple sub-control stages, the first driving current is not a fixed current, but multiple currents provided in segments. In the opening period, the hydrogen injector injects hydrogen matching the hydrogen demand under the action of the first driving current. After the opening period ends, the solenoid valve no longer receives the first driving current and immediately enters the closing period.

[0031] S120 . During the closing period, provide a second driving current to the hydrogen injector to control the solenoid valve of the hydrogen injector to close.

[0032] The maximum value of the second driving current is less than the maximum value of the first driving current. The driving current in each control period can also be understood as the working current of the hydrogen injector (or solenoid valve).

[0033] In the prior art, after the supply of the first drive current ends and the opening period ends, hydrogen generally directly adjusts the solenoid valve to the power-off state and closes the solenoid valve. However, the inventors found that under this control mode, when the solenoid valve is closed, the valve core will quickly return to its seat, resulting in a large seating impact. Since the lubrication of the gas injector is worse, the hydrogen injector needs to be opened / closed hundreds of millions of times during the life cycle of a car. When the solenoid valve is subjected to a large impact for a long time, it will cause serious wear of the solenoid valve and reduce the service life of the hydrogen injector.

[0034] Based on this, the embodiment of the present invention proposes that after the start period ends, a smaller second drive current can be provided to the hydrogen injector. The second drive current will provide a smaller opening force to the solenoid valve, and the opening force is opposite to the direction of the normal closing force of the valve core after the opening period ends, thereby offsetting the impact of the valve core when it is seated and closed, reducing the impact force of the valve core when the solenoid valve is closed, and achieving the effect of slow seating of the solenoid valve. Reduce the wear of the solenoid valve, extend the service life of the hydrogen burner, and improve the durability and reliability of the hydrogen injector.

[0035] Optionally, the embodiments of the present invention do not limit the specific waveforms and sizes of the first driving current and the second driving current, and those skilled in the art may set them according to actual needs.

[0036] A control method for a hydrogen injector provided in an embodiment of the present invention, the hydrogen injector includes an opening period and a closing period, and at least one of the opening period and the closing period includes multiple sub-control stages. In the opening period, a first driving current is provided to the hydrogen injector to control the opening of the solenoid valve of the hydrogen injector; in the closing period, a second driving current is provided to the hydrogen injector to control the closing of the solenoid valve of the hydrogen injector; the maximum value of the second driving current is less than the maximum value of the first driving current. The opening period is used to meet the engine torque demand for hydrogen injection amount, and the closing period is used to slow down the return of the solenoid valve to the seat. Through the above scheme, the impact of the valve core when it is seated and closed can be offset, and the impact force of the valve core when the solenoid valve is closed can be reduced, so as to achieve the effect of slow seating of the solenoid valve. Reduce the wear of the solenoid valve, extend the service life of the hydrogen burner, and improve the durability and reliability of the hydrogen injector.

[0037] Based on the above embodiment, a variant embodiment of the above embodiment is proposed. It should be noted that in order to make the description concise, only the differences from the above embodiment are described in the variant embodiment.

[0038] Optionally, in one embodiment, the start-up period includes a plurality of sub-control stages performed in sequence, the plurality of sub-control stages of the start-up period include a first sub-control stage, and the first sub-control stage is the first sub-control stage in the start-up period; the hydrogen injector has a first sub-rated drive current in the first sub-control stage, and the first sub-rated drive current is calibrated when the hydrogen injector is factory set; the first drive current includes a first sub-drive current; (S110) in the above embodiment can be further refined as: providing a first sub-drive current to the hydrogen injector in the first sub-control stage; wherein the maximum value of the first sub-drive current is less than the first sub-rated drive current.

[0039] In a preferred embodiment, a segmented control strategy can be adopted for the opening period, wherein the first sub-control stage is the first control stage performed in the opening period. In the first sub-control stage, the solenoid valve is driven by a first drive current. In order to improve the response rate of the solenoid valve, a larger value of the first sub-drive current is set. Generally, the first sub-drive current is the maximum drive current in the multi-segment sub-control stage. The present invention takes into account that when the solenoid valve is opened, there is also the problem of impact on the valve core. When the current in the first sub-drive stage is very large, the solenoid valve opens very quickly, which will cause a large impact on the valve core.

[0040] Based on this, an embodiment of the present invention proposes that the driving current of the first sub-control stage can be designed to reduce the degree of mechanical impact caused by the opening of the solenoid valve.

[0041] Specifically, the rated drive current of each sub-control stage of the hydrogen injector will be calibrated before leaving the factory. The rated drive current corresponding to the first sub-control stage is the first sub-rated drive current, and the first sub-rated drive current is provided by the hydrogen injector manufacturer. Figure 2 A waveform diagram of a driving current provided by an embodiment of the present invention, Figure 2 The figure shows the change of the first driving current corresponding to each sub-control stage in the starting period, with the horizontal axis representing the driving time and the vertical axis representing the current value. Figure 2 The thicker dotted line in the first sub-control stage in FIG. 1 represents the first sub-rated drive current, and the thinner solid line represents the first sub-drive current. Figure 2 As shown, in this embodiment, the maximum value of the first sub-driving current (i.e., the first sub-driving current) provided by the solenoid valve control module to the solenoid valve in the first sub-control stage can be set to be less than the first sub-rated driving current. In other words, the maximum value of the actual working current of the solenoid valve in the first sub-control stage is less than the maximum value of its rated working current. In this way, the opening rate of the solenoid valve is reduced by reducing the working current of the solenoid valve in the initial opening period, thereby reducing the impact when the solenoid valve is opened and extending the service life of the hydrogen injector.

[0042] Among them, it should be noted that when the driving current of the first sub-control stage is reduced, the response time of the solenoid valve opening will increase. When actually selecting the first sub-driving current, a balance must be struck between delaying the response time and reducing the impact, while achieving the effect of reducing the impact and rapid response. The value of the first sub-driving current is not limited and can be set according to the bench test results.

[0043] Optionally, in some embodiments, the multiple sub-control stages of the opening period also include a second sub-control stage and a third sub-control stage; the first sub-control stage, the second sub-control stage and the third sub-control stage are performed sequentially; the first drive current also includes a second sub-drive current and a third sub-drive current; in the above embodiment (after the first sub-control stage provides the first sub-drive current to the hydrogen injector), it may also include: providing the second sub-drive current to the hydrogen injector in the second sub-control stage, and providing the third sub-drive current to the hydrogen injector in the third sub-control stage; wherein the maximum value of the second sub-drive current is less than the maximum value of the first sub-drive current, and the maximum value of the third sub-drive current is less than the maximum value of the second sub-drive current.

[0044] Can continue Figure 2 , the multiple sub-control stages of the opening period may include a first sub-control stage, a second sub-control stage and a third sub-control stage which are performed in sequence, and the above three sub-control stages are driven by different drive currents respectively. The design method of the first sub-drive current is the same as that of the above embodiment, and will not be repeated here; in the second sub-control stage, the solenoid valve is driven by the second sub-drive current; in the third sub-control stage, the solenoid valve is driven by the third sub-drive current. The duration of the first sub-control stage, the second sub-control stage and the third sub-control stage can be set according to actual needs, and the embodiment of the present invention does not limit this.

[0045] Furthermore, this embodiment stipulates that during the opening period, the first drive current of the solenoid valve shows a gradually decreasing trend, that is, the maximum value of the first sub-drive current is greater than the maximum value of the second sub-drive current, and the maximum value of the second sub-drive current is greater than the maximum value of the first sub-drive current.

[0046] like Figure 2 As shown, the driving current of the first sub-control stage uses the driving current with a boost circuit. This driving current is usually the largest current among the three driving currents. The purpose is to make the solenoid valve open quickly and improve the response rate of the solenoid valve; the driving current of the second sub-control stage uses the driving current driven by the battery voltage. This driving current is generally less than or equal to the first sub-driving current. The purpose is to completely overcome the spring force and make the hydrogen injector solenoid valve fully open; the driving current of the third sub-control stage also uses the driving current driven by the battery voltage. This driving current is generally much smaller than the second sub-driving current and is the smallest current among the three driving currents. It is generally the minimum current used to maintain the solenoid valve open. The purpose is to keep the solenoid valve open and ensure that the injector is always in the open injection state.

[0047] One thing that needs to be explained is that Figure 2As shown, the first sub-drive current includes a peak current; the second sub-drive current and the third sub-drive current are oscillating currents including multiple peak currents. The maximum value of each drive current may refer to its corresponding peak current. The end time of the first sub-control stage is the time when the peak current is reached.

[0048] Optionally, in some embodiments, the hydrogen injector has a second sub-rated driving current in the second sub-control stage and a third sub-rated driving current in the third sub-control stage, and the second sub-rated driving current and the third sub-rated driving current are calibrated when the hydrogen injector is factory set; the current mean of the second sub-driving current is equal to the second sub-rated driving current, and the current mean of the third sub-driving current is equal to the third sub-rated driving current.

[0049] Since the driving current values ​​in the second sub-control stage and the third sub-control stage are reduced and the solenoid valve has been opened, the hydrogen injector can be controlled according to the rated driving current to ensure that the solenoid valve is stably opened during the entire opening period.

[0050] Exemplarily, as described in the above embodiment, the second sub-drive current and the third sub-drive current are oscillating currents, then the current mean (average current value) of the second sub-drive current in the second sub-control stage is equal to the second sub-rated drive current, and the current mean (average current value) of the third sub-drive current in the third sub-control stage is equal to the third sub-rated drive current.

[0051] The embodiment of the present invention does not limit specific values ​​of the first sub-driving current, the second sub-driving current, and the third sub-driving current.

[0052] Optionally, in some embodiments, the hydrogen injector adopts a voltage source current control scheme; the above embodiment (providing a first sub-drive current to the hydrogen injector in the first sub-control stage) can be further refined as: transmitting a first sub-drive voltage signal to the hydrogen injector in the first sub-control stage, and the first sub-drive voltage signal is converted into a first sub-drive current; (providing a second sub-drive current to the hydrogen injector in the second sub-control stage, and providing a third sub-drive current to the hydrogen injector in the third sub-control stage) can be further refined as: transmitting a second sub-drive voltage signal to the hydrogen injector in the second sub-control stage, and the second sub-drive voltage signal is converted into a second sub-drive current; transmitting a third sub-drive voltage signal to the hydrogen injector in the third sub-control stage, and the third sub-drive voltage signal is converted into a third sub-drive current.

[0053] In this embodiment, the solenoid valve control module can transmit a driving voltage signal to the solenoid valve, and the driving voltage signal is converted into a corresponding driving current, thereby controlling the solenoid valve. As described above, the first sub-driving voltage signal can be a driving voltage signal provided by the boost circuit, and the second sub-driving voltage signal and the third sub-driving voltage signal can be driving voltage signals provided by the battery voltage.

[0054] Of course, in an embodiment not shown in the present invention, the solenoid valve control module may directly transmit the corresponding driving current to the solenoid valve, which is not described in detail in the embodiment of the present invention.

[0055] Further, Figure 3 A waveform diagram of a driving signal provided by an embodiment of the present invention, Figure 3 Figure (a) is a waveform diagram of the first driving current, where the horizontal axis is the driving time and the vertical axis is the driving current. Figure 3 Figure (b) is a waveform diagram of the first driving voltage signal, where the abscissa is the driving time and the ordinate is the driving voltage. Figure 3 The thinner solid line in FIG. 1 represents the first driving voltage signal. Figure 2 and Figure 3 In some embodiments, the first sub-driving voltage signal, the second sub-driving voltage signal and the third sub-driving voltage signal are all pulse width modulation signals; the duty cycle of the first sub-driving voltage signal is greater than the duty cycle of the second sub-driving voltage signal, and the duty cycle of the second sub-driving voltage signal is greater than the duty cycle of the third sub-driving voltage signal.

[0056] Pulse Width Modulation (PWM) is a technology that uses the digital output of a microprocessor to control an analog circuit. The average level of the output signal is controlled by adjusting the duty cycle of the digital signal, that is, the ratio of the pulse width to the cycle duration. The voltage values ​​corresponding to the first sub-driving voltage signal, the second sub-driving voltage signal, and the third sub-driving voltage signal are the PWM driving voltages of the hydrogen injector, and the values ​​may be the same.

[0057] In order to obtain Figure 2 The first driving current waveform shown can set the duty cycles of the first sub-driving voltage signal, the second sub-driving voltage signal and the third sub-driving voltage signal to gradually decrease, that is, the duty cycle of the first sub-driving voltage signal is the largest, the duty cycle of the second sub-driving voltage signal is the second largest, and the duty cycle of the third sub-driving voltage signal is the smallest.

[0058] The embodiments of the present invention do not limit the duty cycle values ​​of each driving voltage signal, and those skilled in the art can set it according to time requirements. For example, in some exemplary schemes, the duty cycle of the first sub-driving voltage signal can be 100%, the maximum value of the first sub-driving current is 16A, the duty cycle of the second sub-driving voltage signal can be 50%, the current mean value of the second sub-driving current can be 15A, the duty cycle of the third sub-driving voltage signal can be 42%, and the current mean value of the third sub-driving current can be 5A. The above values ​​are only examples and do not represent design solutions.

[0059] Among them, on the engine controller with the hydrogen injector hardware current closed-loop drive control, the magnitude of the first sub-drive current is directly set to automatically generate the first drive voltage signal corresponding to the first sub-drive current. On the engine controller without the hydrogen injector hardware current closed-loop drive control, the staff needs to calculate the first sub-drive signal according to the parameters such as the internal resistance of the hydrogen injector.

[0060] Optional, you can continue to refer to Figure 2 and Figure 3 In some embodiments, the duration of the first sub-control stage is shorter than the duration of the second sub-control stage, and the duration of the second sub-control stage is shorter than the duration of the third sub-control stage.

[0061] The first sub-control stage is mainly used to quickly open the solenoid valve, and the duration of this stage can be shorter; the second sub-control stage is used to fully open the solenoid valve, and the duration of this stage can be longer than the first sub-control stage; the third sub-control stage is used to maintain the opening of the solenoid valve, and the duration of this stage can be longer than the second sub-control stage. Among them, the duration of the first sub-control stage and the second sub-control stage is basically determined in the factory design stage, and the duration of the third sub-control stage is not a fixed value. Its value depends on the final hydrogen injection amount and the injection flow characteristics of the hydrogen injector. The larger the injection amount, the longer the duration and the longer the hydrogen injection time.

[0062] Optionally, in some embodiments, the hydrogen injector also has a first rated duration in the first sub-control stage; the above embodiment (providing a first sub-drive current to the hydrogen injector in the first sub-control stage) can be refined as: transmitting a first sub-drive voltage signal to the hydrogen injector in the first sub-control stage, and converting the first sub-drive voltage signal into a first sub-drive current; wherein, the actual duration of the first sub-drive voltage signal in the first sub-control stage is less than the first rated duration.

[0063] Among them, the first rated duration may also be included in the hydrogen factory setting, and the first rated duration refers to the preset duration of the first sub-driving voltage signal required to achieve the first sub-rated driving current. It can be understood that the duration of the driving voltage signal is related to the driving current corresponding to it. When the first sub-driving current actually required is less than the first sub-rated driving current, the duration of the first sub-driving voltage signal should also be appropriately shortened.

[0064] For example, in the time dimension, the first sub-driving voltage may be outputted with a delay of a certain length of time, and the reference Figure 2 and Figure 3 , Figure 3The thicker dotted line in the figure represents the waveform of the first sub-drive voltage signal under rated conditions before the improvement of the scheme of the present invention is performed. Under the original rated conditions, the first sub-drive voltage signal is transmitted to the hydrogen burner at the first moment T0, and the first sub-control stage is entered. After the first sub-control stage lasts for the first rated duration T01, the transmission of the first sub-drive voltage signal is terminated. After the improvement of the scheme of the present invention is performed, the first sub-drive voltage signal is transmitted to the hydrogen burner at the first moment T1, and the first sub-control stage is entered. After the first sub-control stage lasts for a certain duration (i.e., the actual duration T11), the transmission of the first sub-drive voltage signal is terminated. The delay duration of the start moment of the first sub-drive voltage signal is the actual duration T11-the first rated duration T01.

[0065] Optionally, in some embodiments, the control method of the hydrogen burner also includes: determining a delay duration; the delay duration is the difference between the first rated duration and the actual duration of the first sub-drive voltage signal; taking the sum of the delay duration and the preset injection start time as the actual injection start time; the preset injection start time is the injection start time of the hydrogen injector when the hydrogen injector reaches the first sub-rated drive current in the first sub-control stage.

[0066] Since the first sub-driving current of the hydrogen injector is reduced, there is a delay in the start time of the hydrogen injector, that is, there is a delay in the start time of the first sub-driving voltage signal. In order to ensure the precise control of the hydrogen injector, it is necessary to increase the compensation control for the delayed opening of the hydrogen injector. After determining the delay time of the start time of the first sub-driving voltage signal, the actual injection start time of the hydrogen injector driven by the first sub-driving current can be calculated, thereby increasing the compensation control for the delayed opening.

[0067] On an engine controller that does not have a hydrogen injector hardware current closed-loop drive control, the compensation opening time needs to be calculated based on the battery voltage controlled by the hydrogen injector PWM. The lower the battery voltage, the longer the compensation time. The specific compensation time needs to be obtained based on the oil pump bench test. On an engine controller that has a hydrogen injector hardware current closed-loop drive control, the compensation opening time is a fixed value within a certain battery voltage range. When it is lower than the battery voltage threshold of the hardware current closed-loop control, the battery voltage is corrected. The lower the battery voltage, the longer the compensation time. The specific compensation time needs to be obtained based on the oil pump bench test.

[0068] Optionally, in some embodiments, the shutdown period includes a fourth sub-control stage and a fifth sub-control stage performed sequentially, and the second drive current includes a fourth sub-drive current and a fifth sub-drive current; the above embodiment (S120, during the shutdown period, providing the second drive current to the hydrogen injector) includes: in the fourth sub-control stage, providing the fourth sub-drive current to the hydrogen injector; in the fifth sub-control stage, providing the fifth sub-drive current to the hydrogen injector; wherein the maximum value of the fourth sub-drive current is greater than the maximum value of the fifth sub-drive current.

[0069] In a preferred embodiment, the closing period may also adopt a segmented control strategy, and the multiple sub-control stages of the opening period may include a fourth sub-control stage and a fifth sub-control stage that are performed in sequence. In the fourth sub-control stage, the solenoid valve is driven by the fourth sub-drive current, and in the fifth sub-control stage, the solenoid valve is driven by the fifth sub-drive current. This embodiment stipulates that during the closing period, the second drive current of the solenoid valve shows a gradually decreasing trend, that is, the maximum value of the fourth sub-drive current is greater than the maximum value of the fifth sub-drive current.

[0070] Figure 4 Another driving current waveform diagram provided by an embodiment of the present invention. Figure 4 The figure shows the change of the driving current corresponding to each sub-control stage in the start period and the closing period. In the time dimension, the first half corresponds to the current waveforms of the first sub-control stage, the second sub-control stage and the third sub-control stage in the opening period, which can be the same as in the above embodiment and will not be described here; the second half corresponds to the current waveforms of the fourth sub-control stage and the fifth sub-control stage in the closing period.

[0071] refer to Figure 4 As shown, in this embodiment, the driving current of the fourth sub-control stage (the fourth sub-driving current) uses a driving current with a boost circuit, and this driving current is usually the maximum current among the multiple driving currents in the off period, which includes a peak current (the same waveform as the first sub-driving current, but a different value); the driving current of the fifth sub-control stage (the fifth sub-driving current) uses a driving current driven by the battery voltage, which is an oscillating current including multiple peak currents (the same waveform as the second sub-driving current, but a different value), and the maximum value (or current average) of the fifth sub-driving current is less than the fourth sub-driving current.

[0072] As mentioned above, the purpose of the fourth sub-drive current and the fifth sub-drive current is to provide a reverse force to the solenoid valve to achieve the purpose of slow seating of the solenoid valve. The segmented control strategy is also adopted during the closing period, which meets the driving current requirements for the opening of the solenoid valve in the hydrogen burner, can ensure the response rate of the solenoid valve, balance the closing rate and the buffering effect, and avoid the solenoid valve closing time being too long due to the existence of the second driving current.

[0073] Optionally, in a possible embodiment, the fourth sub-driving current is greater than the minimum value of the first driving current and less than the maximum value of the first driving current, and the fifth sub-driving current is less than or equal to the minimum value of the first driving current.

[0074] Specifically, the current value of the fourth sub-drive current may be less than the current value of the second sub-drive current in the opening period, and greater than the current value of the third sub-drive current; the current value of the fifth sub-drive current may be less than or equal to the current value of the third sub-drive current. Thus, under the premise of providing sufficient reverse force, it is prevented that the solenoid valve is opened again due to excessive reverse force. It should be noted that the current values ​​of different drive currents compared in the embodiment of the present invention are the maximum values ​​for the current provided by the boost circuit and the average current values ​​for the current provided by the battery voltage.

[0075] The above-mentioned segmented control strategy of the closing period can also be regarded as a three-stage control strategy, and the fifth sub-control stage also includes a sixth sub-control stage, and the sixth sub-control stage provides a sixth sub-drive current to the hydrogen injector, and the sixth sub-drive current is 0.

[0076] Of course, in other embodiments not shown, the closing period may also adopt a one-stage control strategy or a multi-stage control strategy, which will not be described in detail in the present invention.

[0077] Optionally, in some embodiments, the control method of the hydrogen burner may further include: recording the injection duration of the hydrogen injector; the injection duration is the duration of the opening period.

[0078] This embodiment proposes a method for calculating the duration of the hydrogen injector. Since the second driving current during the closing period is insufficient to open the hydrogen injector solenoid valve and no hydrogen is ejected, the driving duration during the closing period is not included in the driving duration of the hydrogen injector. Therefore, the duration of the hydrogen injector (i.e., the duration of the injection) is the duration of the opening period.

[0079] For example, in a specific embodiment, the following parameters are calibrated when the hydrogen injector is factory set: the first sub-rated driving current in the three-stage control strategy in the start period is 19 A, the second sub-rated driving current is 15 A, and the third sub-rated driving current is 5 A. The three-stage current is realized by using PWM segmented duty cycle control, the PWM driving voltage of the hydrogen injector (i.e., the voltage value of the first sub-driving voltage signal and the second sub-driving voltage signal) is 24 V, and the driving frequency is 100 kHz. In the first sub-control stage, the duty cycle of the first sub-drive voltage signal is 100%, and the first rated duration of the first sub-control stage is 250us, so that the first sub-rated drive current reaches 19A; the duty cycle of the second sub-drive voltage signal in the second sub-control stage is 50%, so that the second sub-rated drive current reaches 15A, and the rated duration of the second sub-control stage is 750us; the duty cycle of the third sub-drive voltage signal in the third sub-control stage is 42%, so that the third sub-rated drive current reaches 5A, and the rated duration of the second sub-control stage is 1000us.

[0080] In the optimized three-stage control strategy in the specific embodiment of the present invention, the first sub-drive current is 16A, the second sub-drive current is 15A, and the third sub-drive current is 5A. The three-stage drive current is realized by using PWM segmented duty cycle control, the hydrogen injector PWM drive voltage is 24V, and the drive frequency is 100kHz. In the first sub-control stage, the duty cycle of the first sub-drive voltage signal is 100%, and the actual duration of the first sub-control stage is 210us, so that the first sub-rated drive current reaches 16A; the duty cycle of the second sub-drive voltage signal in the second sub-control stage is 50%, so that the second sub-rated drive current reaches 15A, and the actual duration of the second sub-control stage is 750us; the duty cycle of the third sub-drive voltage signal in the third sub-control stage is 42%, so that the third sub-rated drive current reaches 5A, and the actual duration of the second sub-control stage is 1000us. Thereby reducing the drive current of the first sub-control stage and slowing down the mechanical impact when the solenoid valve is opened.

[0081] Furthermore, in the off period, the fourth sub-drive current is 10A and the fifth sub-drive current is 5A. The PWM drive voltage in the off period is 24V and the drive frequency is 100kHz. The duty cycle of the fourth sub-drive voltage signal in the fourth sub-control stage is 30%, and the fourth sub-drive current can reach 10A; the duty cycle of the fifth sub-drive voltage signal in the fifth sub-control stage is 42%, the fifth sub-drive current is 5A, and the duration of the fifth sub-control stage is 400us.

[0082] Furthermore, since the first sub-driving current of the hydrogen injector is reduced, the start time of the hydrogen injector is delayed by 250us-210us=40us. Therefore, it is necessary to add a fixed delay correction time of 40us to the start time of the hydrogen injector according to the actual needs of each engine working condition. For example: at a certain working condition, the original hydrogen injection start time is 10000us before the engine compression top dead center, and the corrected actual injection start time is 10040us before the engine compression top dead center.

[0083] Furthermore, since the driving current during the closing period is insufficient to open the hydrogen injector solenoid valve and no hydrogen is ejected, the driving duration during the closing period is not included in the driving duration of the hydrogen injector. The injection duration of the hydrogen injector is 210us+750us+1000us=1960us.

[0084] According to actual tests, during the hydrogen injector opening period, by reducing the first sub-drive current of the hydrogen injector from 19A to 16A, the opening time is slowed by 40us, but the durability is significantly improved. When the opening scheme is enabled alone, the number of hydrogen injector switches can be increased from 10 million to 20 million times. During the hydrogen injector closing period, the durability can be significantly improved by adding a small current (second drive current) to inject the drive to offset the impact of the valve core when it is seated and closed. When the closing scheme is enabled alone, the number of hydrogen injector switches can be increased from 10 million to 20 million times. When both the opening and closing schemes are enabled, the number of switches can reach 35 million times.

[0085] Based on the same concept, an embodiment of the present invention further provides a control device for a hydrogen injector, which is used to execute the control method for a hydrogen injector provided in any embodiment of the present invention. The device can be implemented by software and / or hardware, and is generally integrated on a terminal device. The control device for the hydrogen injector includes a solenoid valve control module, which is used to provide a first drive current to the hydrogen injector during an opening period to control the solenoid valve of the hydrogen injector to open, and is also used to provide a second drive current to the hydrogen injector during a closing period to control the solenoid valve of the hydrogen injector to close; the maximum value of the second drive current is less than the maximum value of the first drive current.

[0086] Through the above scheme, the impact of the valve core when it is seated and closed can be offset, and the impact force of the valve core when the solenoid valve is closed can be reduced, so as to achieve the effect of slow seating of the solenoid valve, reduce the wear of the solenoid valve, extend the service life of the hydrogen burner, and improve the durability and reliability of the hydrogen injector.

[0087] The control device of the hydrogen injector provided in the embodiment of the present invention can execute the control method of the hydrogen injector provided in any embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. The contents not fully described in the embodiments corresponding to the control device can refer to the embodiments corresponding to the control method.

[0088] An embodiment of the present invention further provides a terminal device, comprising: one or more processors; a storage device for storing one or more programs; when the one or more programs are executed by one or more processors, the one or more processors implement a control method for a hydrogen injector as in any embodiment of the present invention.

[0089] The storage device in the terminal device is a computer-readable storage medium and can be used to store one or more programs, which can be software programs, computer executable programs and modules, such as program instructions / modules corresponding to the control method of the hydrogen injector provided in the embodiment of the present invention. The processor executes various functional applications and data processing of the terminal device by running the software programs, instructions and modules stored in the storage device, that is, realizing the control method of the hydrogen injector in the above method embodiment.

[0090] The storage device may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function; the data storage area may store data created according to the use of the device, etc. In addition, the storage device may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the storage device may further include a memory remotely arranged relative to the processor, and these remote memories may be connected to the device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0091] An embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, it is used to execute the control method of the hydrogen injector of any embodiment of the present invention.

[0092] The computer storage medium of the embodiment of the present invention may adopt any combination of one or more computer-readable media. The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples (non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable CD-ROM, an optical storage device, a magnetic storage device, or any suitable combination of the above. The computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, device or device.

[0093] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to: electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0094] The program code contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, optical cable, radio frequency (RF), etc., or any suitable combination of the above.

[0095] Computer program code for performing the operations of the present invention may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0096] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for controlling a hydrogen injector, characterized in that: The hydrogen injector includes an opening period and a closing period, and at least one of the opening period and the closing period includes a plurality of sub-control stages; the control method includes: During the opening period, a first driving current is provided to the hydrogen injector to control the solenoid valve of the hydrogen injector to open; During the closing period, a second driving current is provided to the hydrogen injector to control the solenoid valve of the hydrogen injector to close; and a maximum value of the second driving current is smaller than a maximum value of the first driving current.

2. The control method of the hydrogen injector according to claim 1, characterized in that: The opening period includes a plurality of sub-control stages that are performed sequentially, wherein the plurality of sub-control stages of the opening period include a first sub-control stage, and the first sub-control stage is the first sub-control stage in the opening period; the hydrogen injector has a first sub-rated driving current in the first sub-control stage, and the first sub-rated driving current is calibrated when the hydrogen injector is factory set; The first driving current includes a first sub-driving current; During the on period, providing a first driving current to the hydrogen injector comprises: In the first sub-control stage, a first sub-driving current is provided to the hydrogen injector; wherein a maximum value of the first sub-driving current is less than the first sub-rated driving current.

3. The control method of the hydrogen injector according to claim 2, characterized in that: The hydrogen injector adopts a voltage source current control scheme; the hydrogen injector also has a first rated duration in the first sub-control stage; Providing a first sub-driving current to the hydrogen injector in the first sub-control stage includes: In the first sub-control stage, a first sub-driving voltage signal is transmitted to the hydrogen injector, and the first sub-driving voltage signal is converted into the first sub-driving current; wherein the actual duration of the first sub-driving voltage signal in the first sub-control stage is less than the first rated duration.

4. The control method of the hydrogen injector according to claim 3, characterized in that: The control method further comprises: Determine a delay duration; the delay duration being a difference between the first rated duration and the actual duration of the first sub-driving voltage signal; The sum of the delay time and the preset injection start time is used as the actual injection start time; the preset injection start time is the injection start time of the hydrogen injector when the hydrogen injector reaches the first sub-rated driving current in the first sub-control stage.

5. The control method of the hydrogen injector according to claim 2, characterized in that: The multiple sub-control stages of the opening period also include a second sub-control stage and a third sub-control stage; the first sub-control stage, the second sub-control stage and the third sub-control stage are performed sequentially; the first drive current also includes a second sub-drive current and a third sub-drive current; After providing the first sub-driving current to the hydrogen injector in the first sub-control stage, the method further includes: In the second sub-control stage, a second sub-driving current is provided to the hydrogen injector, and in the third sub-control stage, a third sub-driving current is provided to the hydrogen injector; wherein the maximum value of the second sub-driving current is less than the maximum value of the first sub-driving current, and the maximum value of the third sub-driving current is less than the maximum value of the second sub-driving current.

6. The control method of the hydrogen injector according to claim 5, characterized in that: The hydrogen injector has a second sub-rated driving current in the second sub-control stage, and has a third sub-rated driving current in the third sub-control stage, and the second sub-rated driving current and the third sub-rated driving current are calibrated when the hydrogen injector is factory set; The current average value of the second sub-driving current is equal to the second sub-rated driving current, and the current average value of the third sub-driving current is equal to the third sub-rated driving current.

7. The control method of the hydrogen injector according to claim 5, characterized in that: The hydrogen injector adopts a voltage source type current control scheme; Providing a first sub-driving current to the hydrogen injector in the first sub-control stage includes: In the first sub-control stage, a first sub-driving voltage signal is transmitted to the hydrogen injector, and the first sub-driving voltage signal is converted into the first sub-driving current; Providing a second sub-driving current to the hydrogen injector in the second sub-control stage, and providing a third sub-driving current to the hydrogen injector in the third sub-control stage, comprises: In the second sub-control stage, a second sub-driving voltage signal is transmitted to the hydrogen injector, and the second sub-driving voltage signal is converted into the second sub-driving current; in the third sub-control stage, a third sub-driving voltage signal is transmitted to the hydrogen injector, and the third sub-driving voltage signal is converted into the third sub-driving current.

8. The control method of the hydrogen injector according to claim 7, characterized in that: The first sub-driving voltage signal, the second sub-driving voltage signal and the third sub-driving voltage signal are all pulse width modulation signals; The duty cycle of the first sub driving voltage signal is greater than the duty cycle of the second sub driving voltage signal, and the duty cycle of the second sub driving voltage signal is greater than the duty cycle of the third sub driving voltage signal.

9. The control method of the hydrogen injector according to claim 5, characterized in that: The duration of the first sub-control phase is shorter than the duration of the second sub-control phase, and the duration of the second sub-control phase is shorter than the duration of the third sub-control phase.

10. The control method of the hydrogen injector according to claim 1, characterized in that: The closing period includes a fourth sub-control stage and a fifth sub-control stage which are performed sequentially, and the second driving current includes a fourth sub-driving current and a fifth sub-driving current; During the closing period, providing a second driving current to the hydrogen injector comprises: In the fourth sub-control stage, providing the fourth sub-driving current to the hydrogen injector; In the fifth sub-control stage, providing the fifth sub-driving current to the hydrogen injector; Wherein, the maximum value of the fourth sub-driving current is greater than the maximum value of the fifth sub-driving current.

11. The control method of the hydrogen injector according to claim 10, characterized in that: The fourth sub-driving current is greater than a minimum value of the first driving current and less than a maximum value of the first driving current, and the fifth sub-driving current is less than or equal to a minimum value of the first driving current.

12. The control method of the hydrogen injector according to claim 1, characterized in that: The control method further comprises: The injection duration of the hydrogen injector is recorded; the injection duration is the duration of the opening period.

13. A control device for a hydrogen injector, characterized in that: For executing the control method of the hydrogen injector according to any one of claims 1 to 12, the control device comprises: The solenoid valve control module is used to provide a first driving current to the hydrogen injector during an opening period to control the solenoid valve of the hydrogen injector to open, and is also used to provide a second driving current to the hydrogen injector during a closing period to control the solenoid valve of the hydrogen injector to close; the maximum value of the second driving current is less than the maximum value of the first driving current.

14. A terminal device, characterized in that: include: one or more processors; A storage device for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method for controlling the hydrogen injector according to any one of claims 1 to 12.

15. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the control method of the hydrogen injector as claimed in any one of claims 1 to 12 is implemented.

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