Gas injector assembly, its control chip, and control method

Abstract

The present application provides a control method for a gas injector assembly. The gas injector assembly includes a control chip, an upper gas rail, a lower gas rail, and a plurality of injectors. The control chip controls the on / off states of the plurality of injectors. Only a single injector is on and the other injectors are off at the same time period. When the injector is on, the injector connects the upper gas rail and the lower gas rail, and the gas in the upper gas rail is injected into the lower gas rail through the injector. It is characterized in that it includes a compensation working mode, and the compensation working mode mainly includes that if a certain specific injector fails to inject successfully, the injection time of other injectors is extended to compensate for the injection volume that the specific injector fails to actually inject. Using the present application, effective compensation for the gas injector can be achieved.

Description

Technical Field

[0001] This application relates to the field of gas injection, and more particularly to a gas injection field formed by multiple injectors. Background Art

[0002] As an effective supplement to fuel injectors, gas injectors are applied in many important occasions where natural gas is used as fuel. The gas injector works with the support of a dispenser, and sensors are arranged on the dispenser to collect the pressure and temperature data in the gas injector.

[0003] Some gas injector assemblies include multiple injectors, and during use, the multiple injectors sequentially inject gas into the gas rail. However, during the cold start of the gas injector assembly, due to the temperature, some injectors may not be able to successfully complete the injection action. If a certain injector fails to complete the injection, it will cause insufficient gas in the rear cylinder. Summary of the Invention

[0004] The purpose of this application is to provide a gas injector assembly, its control chip, and control method.

[0005] To achieve the above application purpose, this application provides a control method for a gas injector assembly. The gas injector assembly includes a control chip, an upper gas rail, a lower gas rail, and multiple injectors. The control chip controls the on / off of the multiple injectors. Only a single injector is on and the other injectors are off at the same time period. When the injector is on, the injector connects the upper gas rail and the lower gas rail, and the gas in the upper gas rail is injected into the lower gas rail through the injector. It is characterized in that it includes a compensation working mode, and this compensation working mode includes the following steps:

[0006] Obtain the actual pressure value in the upper gas rail at a specific time point after the predetermined injection start of a certain specific injector;

[0007] Judge whether the specific injector has successfully injected;

[0008] If the specific injector fails to inject successfully, compensate for the injection volume that the specific injector has not actually injected by extending the injection time of other injectors.

[0009] This application also has the following feature. It is judged whether the specific injector has successfully injected by whether the pressure drop between the start injection time set by the specific injector and the pressure at this specific time point meets the preset conditions. The specific time point is when the predetermined injection is completed.

[0010] This application also has the following feature. It is judged whether the specific injector has successfully injected by comparing the actual pressure value at the completion of injection set by the specific injector with the preset pressure value. The specific time point is when the predetermined injection is completed.

[0011] The present application also has the following feature: compensating for the amount of gas not injected by the specific injector by extending the injection time of the injector that starts next for the specific injector.

[0012] The present application also has the following feature: compensating for the amount of gas not injected by the specific injector by extending the overall injection time of other injectors except the specific injector that fails to inject successfully.

[0013] The present application also has the following feature: including the step of obtaining the ambient temperature when the gas injector assembly is operating, and entering the compensation operating mode when the ambient temperature is lower than a predetermined value.

[0014] The present application also has the following feature: including the step of exiting the compensation operating mode when it is detected that all the injectors are operating normally and the gas temperature is greater than a preset value.

[0015] The present application also has the following feature: the gas injector assembly includes a plurality of cylinders in gas communication with the gas rail, including a gas tank, a pressure reducing valve is provided between the gas tank and the upper gas rail, the injector is an electronic switch valve, the gas is natural gas, and the actual pressure value is obtained by measuring with a set sensor.

[0016] The present application further provides a control chip for a gas injector assembly, characterized in that a non-volatile computer instruction sequence capable of implementing the above-described control method for the gas injector assembly is stored therein.

[0017] The present application also provides a gas injector assembly, including a plurality of injectors and an upper gas rail and a lower gas rail communicated with the injectors, and the above-described control chip controls the injectors.

[0018] When the technical solution provided by the present application is used, when some injectors cannot inject successfully, the other injectors can be used for compensating injection, so that the gas injector assembly can operate normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The exemplary embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the embodiments described below are only for explaining the present application and do not limit the scope of the present application. In the accompanying drawings:

[0020] Figure 1 is a structural block diagram of an embodiment of the gas injector assembly of the present application;

[0021] Figure 2 is a flowchart of the control method for the gas injector assembly of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] It should be understood that the drawings are only used for exemplary illustration of the present application. The longitudinal axis of each device in the present application is understood as the axis in the longer direction of the main body of the device.

[0023] Please refer to Figure 1 As shown, it is a structural block diagram of an embodiment of the gas injector assembly of the present application. The gas injector assembly 100 includes a gas tank 1. The gas tank 1 is connected to the upper gas rail 2 through a pressure reducing valve (not shown in the figure), and the pressure reducing valve can be opened or closed as needed. In some embodiments including this embodiment, the gas in the gas tank 1 is natural gas, and the pressure reducing valve is an electronic pressure reducing valve and is controlled by the control chip 4 of the gas injector assembly 100. The upper gas rail 2 is in gas communication with a plurality of injectors 7, which is N in this embodiment, preferably 6. The injector 7 is an electronic switching valve and is controlled by the control chip 4. At the same time, the injector 7 is in gas communication with the lower gas rail 6, and the lower gas rail 6 is connected to 6 cylinders 3 through 6 air pipes (not numbered). It can be seen that in this embodiment, the number of injectors 7 is the same as the number of cylinders 3, but it can be different in other embodiments. In this embodiment, the gas injector assembly 100 includes a temperature sensor, which is arranged on the injector 7 in this embodiment to measure the temperature of the gas. The gas injector assembly 100 includes a pressure sensor, which is arranged in the upper gas rail 2 in this embodiment to measure the pressure of the gas in the upper gas rail. Of course, in other embodiments, other methods can also be used to obtain the values of temperature and pressure, such as mathematical operations based on other parameters. Although there are 6 injectors 7 in this embodiment, only one injector 7 injects gas into the lower gas rail 6 under the control of the control chip 4 at the same time period.

[0024] Please refer to in conjunction with Figure 2As shown, it is a flow chart of an embodiment of the gas injector assembly control method of the present application. The control method includes the following steps. First, in step S001, the natural gas temperature in the injector is measured by a temperature sensor, because the control method can be used when the gas injector assembly is cold started. In this case, the natural gas temperature in the injector is actually the ambient temperature. When the ambient temperature is lower than the predetermined value, step S002 is entered, that is, the compensation working mode. The predetermined value is stored in the control chip 4 in this embodiment, which is 0 degrees Celsius (calibrable). In step S002, the gas pressure of the first injector 7 in the upper gas rail 2 before the injection starts is obtained by a pressure sensor. Because multiple injectors 7 work in sequence under the control of the control chip 4, for the convenience of explanation, the injector 7 that needs to be measured to enter the working state is referred to as a specific injector in this application. In this embodiment, the gas pressure is the same as the gas pressure of the specific injector 7, and the gas pressure is lower than the gas pressure in the gas box 1. Then enter step S003, in which it is determined whether the specific injector 7 has successfully injected. Here, the determination method of whether the injection is successful is described in two ways. The first is to judge by the pressure drop between the pressure in the upper gas rail 2 before the specific injector 7 injects and the predetermined gas pressure value after the injection is completed. Because in theory, there will be a certain decrease in pressure before and after the injection of the specific injector 7, and the value of this pressure drop can be obtained through practice or theoretical calculation, and stored in the control chip 4 in advance. If the value of the pressure drop actually measured reaches the theoretical value of the pressure drop, it is determined that the specific injector 7 has successfully injected, and the system returns to step S002 and measures the second specific injector 7. If the value of the pressure drop actually obtained before and after the first specific injector 7 works is less than the preset theoretical value of the pressure drop, it belongs to the specific injector 7 Unsuccessful injection. Another way is to obtain the theoretical value of the gas pressure in the upper gas rail 2 after the first specific injector 7 is injected according to practice or theoretical calculation, and obtain the actual pressure value in the upper gas rail 2 after the preset first specific injector is injected. If the actual pressure value is the same as the aforementioned theoretical value, it is considered that the specific injector 7 has successfully injected. If the actual pressure value is equal to the theoretical pressure value, the system returns to step S002 and starts measuring the second specific injector 7. If the actual pressure value is less than the theoretical pressure value, it is considered that the first specific injector 7 has not successfully injected. In step S003, the amount of gas that has not been injected by the specific injector 7 is compensated by extending the injection time of other injectors 7. For the method of compensating injection, two methods are exemplified here. The first method is to extend the injection amount of the second specific injector 7, and to complete the extension of the injection time of the second specific injector 7 to compensate for the injection amount of the first specific injector 7.The second method is to extend the injection amounts of other injectors except the first specific injector 7 that fails to inject successfully, and jointly compensate for the injection amount that the first specific injector 7 fails to inject successfully by averaging and extending the injection times of other injectors. Considering that in most cases, if the gas temperature is higher than a certain temperature, the possibility that the injector 7 fails to inject successfully is relatively small. Therefore, in this embodiment, step S004 is included, which is a step of exiting the compensation working mode if it is detected that all the injectors (7) are working normally for a predetermined time and the gas temperature is greater than a preset value.

[0025] In this embodiment, for the actual pressure value, at the time point when the predetermined injection is completed, the pressure at this place is measured by a sensor. In other embodiments, this time point can be any specific time point after the injection starts. And the actual pressure value can also be obtained by other means, such as being calculated by software using a specific algorithm in combination with other data of the product.

[0026] In addition, the present application also discloses a control chip 4 for a gas injector assembly. To cooperate with the implementation of the above method, a non-volatile computer instruction sequence that can complete the above method is stored in the control chip 4 during implementation.

[0027] Of course, the present application can also have other implementation manners, as long as the results do not violate the creative concept of the present application, they all fall within the protection scope of the present application.

Claims

1. A method for controlling a gas injector assembly, the gas injector assembly (100) comprising a control chip (4), an upper gas rail (2), a lower gas rail (6) and a plurality of injectors (7), wherein the control chip (4) controls the on / off of the plurality of injectors (7), and only a single injector (7) is on and the other injectors (7) are off at the same time period. When the injector (7) is on, the injector (7) connects the upper gas rail (2) and the lower gas rail (6), and the gas in the upper gas rail (2) is injected into the lower gas rail (6) through the injector (7), characterized in that, including a compensation operation mode, which includes the following steps obtaining an actual pressure value in the upper air rail (2) at a specific time point after the predetermined injection start of a certain specific injector (7); judging whether the specific injector (7) has successfully injected; if the specific injector (7) has not successfully injected, compensating for the injection volume not actually injected by the specific injector (7) by extending the injection time of other injectors (7).

2. The gas injector assembly control method according to claim 1, characterized in that, judging whether the specific injector (7) has successfully injected by determining whether the pressure drop from the start of injection set by the specific injector (7) to this specific time point conforms to a preset condition, where the specific time point is when the predetermined injection is completed; 3. The gas injector assembly control method according to claim 1, characterized in that, judging whether the specific injector (7) has successfully injected by comparing the actual pressure value at the completion of injection set by the specific injector (7) with a preset pressure value, where the specific time point is when the predetermined injection is completed; 4. The method for controlling a gas injector assembly according to claim 1 or 2 or 3, characterized in that, compensating for the gas volume not injected by the specific injector (7) by extending the injection time of the next injector started by the specific injector (7).

5. The method for controlling a gas injector assembly according to claim 1 or 2 or 3, characterized in that, compensating for the gas volume not injected by the specific injector (7) by extending the overall injection time of other injectors except the specific injector (7) that has not successfully injected.

6. The method for controlling a gas injector assembly according to claim 1, wherein, including the step of obtaining the ambient temperature when the gas injector assembly (100) is operating, and entering the compensation operation mode when the ambient temperature is lower than a predetermined value.

7. The method for controlling a gas injector assembly according to claim 1, characterized in that, including the step of exiting the compensation operation mode when it is detected that all the injectors (7) are operating normally and the gas temperature is greater than a preset value.

8. The injector assembly control method according to claim 1 or 2 or 3 or 6 or 7, characterized in that, The gas injector assembly (100) includes a plurality of cylinders in gas communication with the lower air rail (6), including a gas tank (1). A pressure reducing valve is provided between the gas tank (1) and the upper air rail (2). The injector is an electronic switching valve. The gas is natural gas. The actual pressure value is obtained by measuring with a set sensor.

9. The injector assembly control method according to claim 4, characterized in that, The gas injector assembly (100) includes a plurality of cylinders in gas communication with the lower air rail (6), including a gas tank (1). A pressure reducing valve is provided between the gas tank (1) and the upper air rail (2). The injector is an electronic switching valve. The gas is natural gas. The actual pressure value is obtained by measuring with a set sensor.

10. The injector assembly control method according to claim 5, wherein, The gas injector assembly (100) includes a plurality of cylinders in gas communication with the lower air rail (6), including a gas tank (1). A pressure reducing valve is provided between the gas tank (1) and the upper air rail (2). The injector is an electronic switching valve. The gas is natural gas. The actual pressure value is obtained by measuring with a set sensor.

11. Gas injector assembly control chip (4), characterized in that, It stores a non-volatile computer instruction sequence that can implement the gas injector assembly control method as described in any one of claims 1 to 10.

12. A gas injector assembly (100), including a plurality of injectors (7), an upper air rail (2) and a lower air rail (6) communicated with the injectors (7), and the control chip (4) as described in claim 11 controls the injectors (7).

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