Control method, control device and control system of methanol supply system

Abstract

The invention discloses a control method, a control device and a control system of a methanol supply system, and relates to the field of methanol supply systems.The methanol supply system comprises a methanol box, a first methanol rough filtration branch, a methanol fine filter, a common rail pipe and an ejector which are sequentially connected; the first methanol coarse filtration branch comprises a first methanol coarse filter, a first methanol pump connected with the first methanol coarse filter, and a first pressure difference measuring device arranged at the inlet and outlet ends of the first methanol coarse filter. The control method comprises the steps that after the engine is powered on, the engine controller controls the first methanol pump to work, obtains the first pressure difference, measured by the first pressure difference measuring device, between the outlet and the inlet of the first methanol coarse strainer, and outputs prompt information for replacing the first methanol coarse strainer under the condition that the first pressure difference exceeds a first pressure difference threshold value. By means of the real-time pressure difference monitoring technology, the blocking state of the methanol coarse filter can be accurately judged, replacement prompt can be triggered in time, and stable operation of a methanol supply system is effectively guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of methanol supply systems, in particular to a control method, a control device and a control system of a methanol supply system. BACKGROUND

[0002] Methanol, as a low-cost and low-carbon emission alternative fuel, is an important development direction of engine fuel. At present, methanol engines have gradually entered the market. The methanol supply system corresponding to the methanol engine generally follows the following process: methanol flows out from the methanol tank, passes through the methanol coarse filter, the methanol pump with pressure relief valve and the methanol fine filter in turn, and finally enters the common rail pipe and is injected into the engine through the injector.

[0003] Since the impurity content of methanol is relatively high, and the internal structure of components such as methanol pump and injector is precise, if the impurities are not effectively filtered, these precise components will be quickly worn out, which seriously affects the system reliability and service life. Therefore, the methanol filter is an indispensable key component in the methanol supply system.

[0004] At present, the maintenance strategy of the methanol filter mainly adopts two ways: one is to replace the methanol filter regularly, and the other is to replace it when the abnormal common rail pressure (rail pressure) is monitored. However, both of these two ways have obvious deficiencies: the regular replacement strategy is easily affected by the rationality of the replacement period setting, and if the actual clogging speed of the methanol filter exceeds the expectation, it may be invalid before the replacement period; and the replacement triggered by the rail pressure abnormality has a lag, at this time the system may have suffered a certain degree of wear due to the invasion of impurities. In addition, the existing rail pressure control technology needs to dynamically consider the fuel consumption during engine operation, which leads to large flow fluctuations in the common rail pipe, further increasing the error of rail pressure measurement. SUMMARY

[0005] Therefore, the present application discloses a control method, a control device and a control system of a methanol supply system to realize real-time differential pressure monitoring technology, which can not only accurately determine the clogging state of the methanol coarse filter, but also timely trigger the replacement prompt, thereby effectively ensuring the stable operation of the methanol supply system.

[0006] A control method of a methanol supply system applied to an engine controller, the methanol supply system comprising: a methanol tank 11, a first methanol coarse filter branch, a methanol fine filter 12, a common rail pipe 13 and an injector 14 connected in turn, the first methanol coarse filter branch comprising: a first methanol coarse filter 21, a first methanol pump 22 connected with the first methanol coarse filter 21, and a first differential pressure measuring device arranged at the inlet and outlet of the first methanol coarse filter 21, the control method comprising:

[0007] controlling the first methanol pump 22 to work when the engine is powered on, and acquiring a first pressure difference between the outlet and the inlet of the first methanol coarse filter 21 measured by the first pressure difference measuring device;

[0008] outputting prompt information for replacing the first methanol coarse filter 21 when the first pressure difference exceeds a first pressure difference threshold.

[0009] Optionally, if the methanol supply system further comprises a second methanol coarse filter branch connected with the methanol tank 11 and the methanol fine filter 12 respectively, the second methanol coarse filter branch comprises a second methanol coarse filter 31, a second methanol pump 32 connected with the second methanol coarse filter 31, and a second pressure difference measuring device arranged at the inlet and outlet of the second methanol coarse filter 31, the pressure relief valve of the second methanol pump 32 is connected with the methanol tank 11, and the control method further comprises:

[0010] controlling the second methanol pump 32 to work when the first pressure difference does not exceed the first pressure difference threshold, and acquiring a second pressure difference between the outlet and the inlet of the second methanol coarse filter 31 measured by the second pressure difference measuring device;

[0011] outputting prompt information for replacing the second methanol coarse filter 31 when the second pressure difference exceeds the first pressure difference threshold.

[0012] Optionally, the control method further comprises:

[0013] controlling the first methanol pump 22 to stop working and controlling the second methanol pump 32 to work when the first pressure difference exceeds the first pressure difference threshold;

[0014] or,

[0015] controlling the second methanol pump 32 to stop working and controlling the first methanol pump 22 to work when the second pressure difference exceeds the first pressure difference threshold.

[0016] Optionally, if the methanol supply system further comprises a third pressure difference measuring device arranged at the inlet and outlet of the methanol fine filter 12, the control method further comprises:

[0017] acquiring a third pressure difference between the outlet and the inlet of the methanol fine filter 12 measured by the third pressure difference measuring device;

[0018] outputting prompt information for replacing the methanol fine filter 12 when the third pressure difference exceeds a second pressure difference threshold.

[0019] A control device of a methanol supply system, applied to an engine controller, the methanol supply system comprising: a methanol tank 11, a first methanol coarse filter branch, a methanol fine filter 12, a common rail pipe 13 and an injector 14 connected in sequence, the first methanol coarse filter branch comprising: a first methanol coarse filter 21, a first methanol pump 22 connected with the first methanol coarse filter 21, and a first differential pressure measuring device arranged at the inlet and outlet of the first methanol coarse filter 21, the control device comprising:

[0020] a first differential pressure acquisition unit, configured to control the first methanol pump 22 to work after the engine is powered on, and acquire a first differential pressure between the outlet and the inlet of the first methanol coarse filter 21 measured by the first differential pressure measuring device;

[0021] a first information output unit, configured to output prompt information for replacing the first methanol coarse filter 21 if the first differential pressure exceeds a first differential pressure threshold.

[0022] Optionally, if the methanol supply system further comprises: a second methanol coarse filter branch, the second methanol coarse filter branch being connected with the methanol tank 11 and the methanol fine filter 12 respectively, the second methanol coarse filter branch comprising: a second methanol coarse filter 31, a second methanol pump 32 connected with the second methanol coarse filter 31, and a second differential pressure measuring device arranged at the inlet and outlet of the second methanol coarse filter 31, the control device further comprising:

[0023] a second differential pressure acquisition unit, configured to control the second methanol pump 32 to work if the first differential pressure does not exceed the first differential pressure threshold, and acquire a second differential pressure between the outlet and the inlet of the second methanol coarse filter 31 measured by the second differential pressure measuring device;

[0024] a second information output unit, configured to output prompt information for replacing the second methanol coarse filter 31 if the second differential pressure exceeds the first differential pressure threshold.

[0025] A control system of a methanol supply system, comprising: a methanol supply system and an engine controller;

[0026] the methanol supply system comprising: a methanol tank 11, a first methanol coarse filter branch, a methanol fine filter 12, a common rail pipe 13 and an injector 14 connected in sequence;

[0027] the first methanol coarse filter branch comprising: a first methanol coarse filter 21, a first methanol pump 22 connected with the first methanol coarse filter 21, and a first differential pressure measuring device arranged at the inlet and outlet of the first methanol coarse filter 21;

[0028] The engine controller is connected with the first methanol pump 22 and the first differential pressure measuring device respectively, for controlling the first methanol pump 22 to work after the engine is powered on, and acquiring the first differential pressure of the outlet and the inlet of the first methanol filter 21 measured by the first differential pressure measuring device, and outputting the prompt information of replacing the first methanol filter 21 when the first differential pressure exceeds the first differential pressure threshold.

[0029] Optionally, the first differential pressure measuring device comprises a first pressure sensor 23 and a second pressure sensor 24.

[0030] The first pressure sensor 23 is arranged between the first methanol filter 21 and the first methanol pump 22, for collecting the outlet pressure of the first methanol filter 21.

[0031] The second pressure sensor 24 is arranged between the first methanol filter 21 and the methanol tank 11, for collecting the inlet pressure of the first methanol filter 21.

[0032] Optionally, the methanol supply system further comprises a second methanol filter branch.

[0033] The second methanol filter branch is connected with the methanol tank 11 and the methanol filter 12 respectively, and the second methanol filter branch comprises a second methanol filter 31, a second methanol pump 32 connected with the second methanol filter 31, and a second differential pressure measuring device arranged at the inlet and outlet of the second methanol filter 31.

[0034] The engine controller is connected with the second methanol pump 32 and the second differential pressure measuring device respectively, for controlling the second methanol pump 32 to work when the first differential pressure does not exceed the first differential pressure threshold, and acquiring the second differential pressure of the outlet and the inlet of the second methanol filter 31 measured by the second differential pressure measuring device, and outputting the prompt information of replacing the second methanol filter 31 when the second differential pressure exceeds the first differential pressure threshold.

[0035] Optionally, the second differential pressure measuring device comprises a second pressure sensor 24 and a third pressure sensor 33.

[0036] The second pressure sensor 24 is arranged in a common passage connected with the methanol tank 11, the second methanol filter 31 and the first methanol filter 21, for collecting the inlet pressure of the second methanol filter 31 when the first methanol pump 22 stops working and the second methanol pump 32 works.

[0037] The third pressure sensor 33 is arranged between the second methanol coarse filter 31 and the second methanol pump 32, and is used to collect the outlet pressure of the second methanol coarse filter 31.

[0038] Optionally, the pressure relief valve of the first methanol pump 22, the pressure relief valve of the second methanol pump 32 and the pressure relief valve of the common rail pipe 13 are all connected with the methanol tank 11.

[0039] Optionally, the methanol supply system further comprises a third differential pressure measuring device.

[0040] The third differential pressure measuring device is connected with the methanol fine filter 12 and the engine controller respectively.

[0041] The third differential pressure measuring device is used to measure the third differential pressure between the outlet and the inlet of the methanol fine filter 12, and output the third differential pressure to the engine controller.

[0042] The engine controller is used to output the prompt information for replacing the methanol fine filter 12 when the third differential pressure exceeds the second differential pressure threshold.

[0043] From the above technical solution, the application discloses a control method, a control device and a control system of a methanol supply system, the methanol supply system comprising: a methanol tank 11, a first methanol coarse filter branch, a methanol fine filter 12, a common rail pipe 13 and an injector 14 connected in sequence, the first methanol coarse filter branch comprising: a first methanol coarse filter 21, a first methanol pump 22 connected with the first methanol coarse filter 21, and a first differential pressure measuring device arranged at the inlet and outlet of the first methanol coarse filter 21. The control method comprises: the engine controller controls the first methanol pump 22 to work after the engine is powered on, and acquires the first differential pressure between the outlet and the inlet of the first methanol coarse filter 21 measured by the first differential pressure measuring device, and outputs the prompt information for replacing the first methanol coarse filter 21 when the first differential pressure exceeds the first differential pressure threshold. The application adds the first differential pressure measuring device at the inlet and outlet of the first methanol coarse filter 21, realizes the real-time monitoring of the first differential pressure between the outlet and the inlet of the first methanol coarse filter 21, and determines that the first methanol coarse filter 21 is seriously blocked when the first differential pressure exceeds the first differential pressure threshold. At this time, the engine controller automatically generates the replacement prompt information to remind the user to replace the first methanol coarse filter 21 in time. Compared with the traditional replacement mode of regular replacement or replacement after rail pressure abnormality, the application can accurately determine the blocking state of the methanol coarse filter by the real-time differential pressure monitoring technology, and timely triggers the replacement prompt, so as to effectively guarantee the stable operation of the methanol supply system. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only aim to explain part of the embodiments of the present application, and all other embodiments obtained by a person of ordinary skill in the art without any creative effort belong to the protection scope of the present application.

[0045] Figure 1 A schematic diagram of a methanol supply system disclosed in an embodiment of the present application;

[0046] Figure 2 A control method flow chart of a methanol supply system disclosed in an embodiment of the present application;

[0047] Figure 3 A schematic diagram of another methanol supply system disclosed in an embodiment of the present application;

[0048] Figure 4 A control method flow chart of another methanol supply system disclosed in an embodiment of the present application;

[0049] Figure 5 A structural schematic diagram of a control device of a methanol supply system disclosed in an embodiment of the present application;

[0050] Figure 6 A structural schematic diagram of a control device of another methanol supply system disclosed in an embodiment of the present application.

[0051] The reference signs are explained as follows:

[0052] A first methanol coarse filter 21, a methanol tank 11, a methanol fine filter 12, a common rail pipe 13, and an injector 14;

[0053] A first pressure relief valve 131, a first methanol pump 22, a second pressure relief valve 221, and a rail pressure sensor 15;

[0054] A first pressure sensor 23 and a second pressure sensor 24;

[0055] A second methanol coarse filter 31, a second methanol pump 32, a third pressure relief valve 321, and a third pressure sensor 33. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without any creative effort belong to the protection scope of the present application.

[0057] The embodiment of the present application discloses a control method, a control device and a control system of a methanol supply system, a first pressure difference measuring device is additionally arranged at the inlet and outlet of a first methanol coarse filter 21, so that the first pressure difference between the outlet and the inlet of the first methanol coarse filter 21 can be monitored in real time. When the first pressure difference exceeds a first pressure difference threshold, it is determined that serious blockage occurs in the first methanol coarse filter 21, and the engine controller automatically generates a replacement prompt information to remind the user to replace the first methanol coarse filter 21 in time. Compared with the traditional replacement mode of periodic replacement or replacement after rail pressure abnormality, the real-time pressure difference monitoring technology can not only accurately determine the blockage state of the methanol coarse filter, but also timely trigger the replacement prompt, so that the stable operation of the methanol supply system is effectively ensured.

[0058] Referring to Figure 1 The embodiment of the present application discloses a schematic diagram of a methanol supply system, which comprises a methanol tank 11, a first methanol coarse filter branch, a methanol fine filter 12, a common rail pipe 13 and an injector 14 connected in sequence.

[0059] It should be noted that the common rail pipe 13 is provided with a first pressure relief valve 131, and the common rail pipe 13 is connected with the methanol tank 11 through the first pressure relief valve 131. When the pressure in the common rail pipe 13 exceeds the set pressure of the first pressure relief valve 131, the first pressure relief valve 131 will automatically open to release the excess pressure in the common rail pipe 13 to the methanol tank 11, so as to prevent the common rail pipe 13 from being damaged due to excessive pressure and realize the safety protection of the methanol supply system.

[0060] The first methanol coarse filter branch comprises a first methanol coarse filter 21, a first methanol pump 22 connected with the first methanol coarse filter 21, and a first pressure difference measuring device arranged at the inlet and outlet of the first methanol coarse filter 21.

[0061] It should be noted that the first methanol pump 22 is provided with a second pressure relief valve 221, and the first methanol pump 22 is connected with the methanol tank 11 through the second pressure relief valve 221. When the pressure in the first methanol pump 22 exceeds the set pressure of the second pressure relief valve 221, the second pressure relief valve 221 will automatically open to release the excess pressure in the first methanol pump 22 to the methanol tank 11, so as to prevent the first methanol pump 22 from being damaged due to excessive pressure and realize the safety protection of the methanol supply system.

[0062] Preferably, the first pressure difference measuring device can comprise a first pressure sensor 23 and a second pressure sensor 24.

[0063] The first pressure sensor 23 is arranged between the first methanol coarse filter 21 and the first methanol pump 22 and is used for collecting the outlet pressure of the first methanol coarse filter 21.

[0064] The second pressure sensor 24 is arranged between the first methanol coarse filter 21 and the methanol tank 11, and is used to collect the inlet pressure of the first methanol coarse filter 21.

[0065] The pressure difference between the outlet pressure of the first methanol coarse filter 21 and the inlet pressure of the first methanol coarse filter 21 is the first pressure difference between the outlet and the inlet of the first methanol coarse filter 21.

[0066] In an embodiment, the methanol supply system can further comprise a rail pressure sensor 15.

[0067] The rail pressure sensor 15 is arranged on the common rail pipe 13, and is used to collect the rail pressure of the common rail pipe 13.

[0068] Figure 1 The working principle of the methanol supply system is as follows:

[0069] When the engine is powered on, the methanol flows out of the methanol tank 11, passes through the first methanol coarse filter 21, the first methanol pump 22, and the methanol fine filter 12 in sequence, and finally enters the common rail pipe 13 and is injected into the engine through the injector 14. During this period, the first pressure difference measuring device measures the first pressure difference between the outlet and the inlet of the first methanol coarse filter 21 in real time.

[0070] Taking an example in which the first pressure difference measuring device comprises the first pressure sensor 23 and the second pressure sensor 24, the first pressure sensor 23 collects the outlet pressure of the first methanol coarse filter 21, and the second pressure sensor 24 collects the inlet pressure of the first methanol coarse filter 21. The difference between the outlet pressure and the inlet pressure is the first pressure difference between the outlet and the inlet of the first methanol coarse filter 21 measured by the first pressure difference measuring device.

[0071] For the methanol supply system shown in the figure, the present application further provides a control method of the methanol supply system. Figure 1 For the methanol supply system shown in the figure, the present application further provides a control method of the methanol supply system.

[0072] Referring to Figure 2 , the flow chart of the control method of the methanol supply system disclosed in the embodiment of the present application, the method is applied to an engine controller, the engine controller is connected with Figure 1 the methanol supply system shown in the figure, and the control method comprises the following steps.

[0073] In step S101, when the engine is powered on, the first methanol pump 22 is controlled to work, and the first pressure difference between the outlet and the inlet of the first methanol coarse filter 21 measured by the first pressure difference measuring device is obtained.

[0074] In the embodiment, the first pressure difference measuring device is connected with the engine controller, and the first pressure difference measuring device can output the first pressure difference between the outlet and the inlet of the first methanol coarse filter 21 measured by the first pressure difference measuring device to the engine controller.

[0075] In practical application, when the first pressure difference measuring device comprises: a first pressure sensor 23 arranged between the first methanol coarse filter 21 and the first methanol pump 22, and a second pressure sensor 24 arranged between the first methanol coarse filter 21 and the methanol tank 11, the engine controller obtains the outlet pressure of the first methanol coarse filter 21 collected by the first pressure sensor 23 and the inlet pressure of the first methanol coarse filter 21 collected by the second pressure sensor 24, and obtains the first pressure difference by calculating the difference between the outlet pressure and the inlet pressure.

[0076] In step S102, it is judged whether the first pressure difference exceeds the first pressure difference threshold value, and if yes, step S103 is executed.

[0077] In step S103, prompt information for replacing the first methanol coarse filter 21 is outputted.

[0078] In practical application, the prompt information for replacing the first methanol coarse filter 21 can be outputted on the instrument panel.

[0079] The value of the first pressure difference threshold value is determined according to actual needs, which is not limited in the present application.

[0080] When the first pressure difference between the outlet and the inlet of the first methanol coarse filter 21 exceeds the first pressure difference threshold value, it indicates that the first methanol coarse filter 21 is seriously blocked, and at this time, the prompt information for replacing the first methanol coarse filter 21 is outputted, so as to facilitate the technical personnel to replace the first methanol coarse filter 21 in time, thereby ensuring the stable operation of the methanol supply system.

[0081] The application discloses a control method of a methanol supply system, and the methanol supply system comprises a methanol tank 11, a first methanol coarse filter branch, a methanol fine filter 12, a common rail pipe 13 and an injector 14 which are sequentially connected, the first methanol coarse filter branch comprises a first methanol coarse filter 21, a first methanol pump 22 connected with the first methanol coarse filter 21 and a first differential pressure measuring device arranged at the inlet and outlet of the first methanol coarse filter 21. The control method comprises the following steps: after the engine controller is powered on, the first methanol pump 22 is controlled to work, the first differential pressure between the outlet and the inlet of the first methanol coarse filter 21 measured by the first differential pressure measuring device is acquired, and the prompt information for replacing the first methanol coarse filter 21 is outputted when the first differential pressure exceeds a first differential pressure threshold. By arranging the first differential pressure measuring device at the inlet and outlet of the first methanol coarse filter 21, the first differential pressure between the outlet and the inlet of the first methanol coarse filter 21 can be monitored in real time. When the first differential pressure exceeds the first differential pressure threshold, it is determined that the first methanol coarse filter 21 is seriously blocked, and the engine controller automatically generates the replacement prompt information to remind the user to replace the first methanol coarse filter 21 in time. Compared with the traditional replacement mode of periodically replacing or replacing after the rail pressure is abnormal, the real-time differential pressure monitoring technology can accurately determine the blocking state of the methanol coarse filter and timely trigger the replacement prompt, thereby effectively guaranteeing the stable operation of the methanol supply system.

[0082] In Figure 1 On the basis of the embodiment shown in the figure, referring to Figure 3 The embodiment of the application discloses another schematic diagram of a methanol supply system, and the methanol supply system comprises a first methanol coarse filter branch and a second methanol coarse filter branch which are connected with the methanol tank 11 and the methanol fine filter 12 respectively.

[0083] The second methanol coarse filter branch comprises a second methanol coarse filter 31, a second methanol pump 32 connected with the second methanol coarse filter 31 and a second differential pressure measuring device arranged at the inlet and outlet of the second methanol coarse filter.

[0084] It should be noted that the second methanol pump 32 is provided with a third pressure relief valve 321, and the second methanol pump 32 is connected with the methanol tank 11 through the third pressure relief valve 321. When the pressure in the second methanol pump 32 exceeds the set pressure of the third pressure relief valve 321, the third pressure relief valve 321 will automatically open to release the excessive pressure in the second methanol pump 32 to the methanol tank 11, so that the second methanol pump 32 is prevented from being damaged due to the excessively high pressure, and the safety protection of the methanol supply system is realized.

[0085] Preferably, the second differential pressure measuring device can comprise a second pressure sensor 24 and a third pressure sensor 33.

[0086] The second pressure sensor 24 is arranged in the common passage between the methanol tank 11 and the second methanol coarse filter 31 and the first methanol coarse filter 21, and is used to collect the inlet pressure of the second methanol coarse filter 31 when the first methanol pump 22 stops working and the second methanol pump 32 works.

[0087] In order to reduce the hardware cost of the methanol supply system, a pressure sensor, i.e. the second pressure sensor 24, is arranged in the common passage between the methanol tank 11 and the second methanol coarse filter 31 and the first methanol coarse filter 21. The first methanol coarse filter branch and the second methanol coarse filter branch are redundant to each other. When the first methanol coarse filter branch works, i.e. when the first methanol pump 22 works, the second pressure sensor 24 collects the inlet pressure of the first methanol coarse filter 21; when the second methanol coarse filter branch works, i.e. when the second methanol pump 32 works, the second pressure sensor 24 collects the inlet pressure of the second methanol coarse filter 31.

[0088] It should be particularly pointed out that, in order to make the service life of the first methanol coarse filter branch and the second methanol coarse filter branch close to each other, the two branches are operated in a way of alternately working.

[0089] The third pressure sensor 33 is arranged between the second methanol coarse filter 31 and the second methanol pump 32, and is used to collect the outlet pressure of the second methanol coarse filter 31.

[0090] The pressure difference between the outlet pressure of the second methanol coarse filter 31 and the inlet pressure of the second methanol coarse filter 31 is the second pressure difference between the outlet and the inlet of the second methanol coarse filter 31.

[0091] Figure 3 The working principle of the methanol supply system shown is as follows:

[0092] (1) The first methanol coarse filter branch works and the second methanol coarse filter branch does not work;

[0093] After the engine is powered on, the methanol flows out from the methanol tank 11, passes through the first methanol coarse filter 21, the first methanol pump 22 and the methanol fine filter 12 in sequence, and finally enters the common rail pipe 13 and is injected into the engine through the injector 14. During this period, the first pressure difference measuring device measures the first pressure difference between the outlet and the inlet of the first methanol coarse filter 21 in real time.

[0094] Taking the first pressure difference measuring device including the first pressure sensor 23 and the second pressure sensor 24 as an example, the first pressure sensor 23 collects the outlet pressure of the first methanol coarse filter 21, and the second pressure sensor 24 collects the inlet pressure of the first methanol coarse filter 21. The difference between the outlet pressure and the inlet pressure is the first pressure difference between the outlet and the inlet of the first methanol coarse filter 21 measured by the first pressure difference measuring device.

[0095] (2) The first methanol coarse filtration branch is working and the second methanol coarse filtration branch is not working;

[0096] When the engine is powered on, methanol flows out of the methanol tank 11, passes sequentially through the second methanol coarse filter 31, the second methanol pump 32, and the methanol fine filter 12, and finally enters the common rail 13 and is injected into the engine through the injector 14. During this period, the second differential pressure measuring device measures the second differential pressure between the outlet and inlet of the second methanol coarse filter 31 in real time.

[0097] Taking the second differential pressure measuring device as an example, which includes a second pressure sensor 24 and a third pressure sensor 33, the third pressure sensor 33 collects the outlet pressure of the second methanol coarse filter 31, and the second pressure sensor 24 collects the inlet pressure of the second methanol coarse filter 31. The difference between the outlet pressure and the inlet pressure is the second differential pressure between the outlet and inlet of the second methanol coarse filter 31 measured by the second differential pressure measuring device.

[0098] against Figure 3 The present invention also provides a control method for the methanol supply system shown in the methanol supply system.

[0099] See Figure 4 The present invention discloses another control method flowchart for a methanol supply system, which is applied to an engine controller. The engine controller and... Figure 3 The methanol supply system connection shown is in Figure 2 Based on the control method shown, if the determination in step S102 is negative, the control method may further include:

[0100] Step S104: Control the second methanol pump 32 to work and obtain the second pressure difference between the outlet and inlet of the second methanol coarse filter 31 as measured by the second differential pressure measuring device.

[0101] In this embodiment, the second differential pressure measuring device is connected to the engine controller, and the second differential pressure measuring device can output the measured second differential pressure between the outlet and inlet of the second methanol coarse filter 31 to the engine controller.

[0102] In practical applications, when the second differential pressure measuring device includes a third pressure sensor 33 located between the second methanol coarse filter 31 and the second methanol pump 32, and a second pressure sensor 24 located between the second methanol coarse filter 31 and the methanol tank 11, the engine controller obtains the outlet pressure of the second methanol coarse filter 31 collected by the third pressure sensor 33 and the inlet pressure of the second methanol coarse filter 31 collected by the second pressure sensor 24. The second differential pressure is obtained by calculating the difference between the outlet pressure and the inlet pressure.

[0103] Step S105: Determine whether the second differential pressure exceeds the first differential pressure threshold. If so, proceed to step S106.

[0104] In step S106, prompt information for replacing the second methanol coarse filter 31 is output.

[0105] In actual application, the prompt information for replacing the second methanol coarse filter 31 can be output on the dashboard.

[0106] When the second pressure difference between the outlet and the inlet of the second methanol coarse filter 31 exceeds the first pressure difference threshold, it indicates that the second methanol coarse filter 31 is seriously blocked. At this time, by outputting the prompt information for replacing the second methanol coarse filter 31, the technician can replace the second methanol coarse filter 31 in time, so as to ensure the stable operation of the methanol supply system.

[0107] In this embodiment, after the engine is powered on, first, the first methanol pump 22 works, and the self-checking operation on the first methanol coarse filter 21 is started, that is, the flowchart shown in FIG. 6 is executed. Figure 2 When the self-checking of the first methanol coarse filter 21 fails, the prompt information for replacing the first methanol coarse filter 21 is output; when the self-checking of the first methanol coarse filter 21 passes, the working of the first methanol pump 22 is switched to the working of the second methanol pump 32, and the self-checking operation on the second methanol coarse filter 31 is started, that is, the flowchart shown in FIG. 7 is executed. Figure 4 When the self-checking of the second methanol coarse filter 31 fails, the prompt information for replacing the second methanol coarse filter 31 is output; when the self-checking of the second methanol coarse filter 31 passes, it is determined that the engine works normally.

[0108] In summary, after the engine controller is powered on, the first methanol pump 22 is controlled to work, and the first pressure difference between the outlet and the inlet of the first methanol filter 21 is measured by the first pressure difference measuring device. If the first pressure difference exceeds the first pressure difference threshold, the engine controller outputs a prompt message to replace the first methanol filter 21. If the first pressure difference does not exceed the first pressure difference threshold, the second methanol pump 32 is controlled to work, and the second pressure difference between the outlet and the inlet of the second methanol filter 31 is measured by the second pressure difference measuring device. If the second pressure difference exceeds the first pressure difference threshold, the engine controller outputs a prompt message to replace the second methanol filter 31. By adding the first pressure difference measuring device at the inlet and outlet of the first methanol filter 21, the first pressure difference between the outlet and the inlet of the first methanol filter 21 is monitored in real time. If the first pressure difference exceeds the first pressure difference threshold, it is determined that the first methanol filter 21 is severely clogged. At this time, the engine controller automatically generates a replacement prompt message to remind the user to replace the first methanol filter 21 in time. By adding the second pressure difference measuring device at the inlet and outlet of the second methanol filter 31, the second pressure difference between the outlet and the inlet of the second methanol filter 31 is monitored in real time. If the second pressure difference exceeds the first pressure difference threshold, it is determined that the second methanol filter 31 is severely clogged. At this time, the engine controller automatically generates a replacement prompt message to remind the user to replace the second methanol filter 31 in time. Compared with the traditional replacement method of replacing the methanol filter periodically or after the rail pressure is abnormal, the real-time pressure difference monitoring technology of the present application can accurately determine the clogging state of the methanol filter and timely trigger a replacement prompt, thereby effectively ensuring the stable operation of the methanol supply system.

[0109] In one embodiment, the control method of the methanol supply system can further include:

[0110] If the first pressure difference exceeds the first pressure difference threshold, the first methanol pump 22 is controlled to stop working, and the second methanol pump 32 is controlled to work.

[0111] Alternatively,

[0112] If the second pressure difference exceeds the first pressure difference threshold, the second methanol pump 32 is controlled to stop working, and the first methanol pump 22 is controlled to work.

[0113] It should be noted that the first methanol crude filter branch and the second methanol crude filter branch are redundant in the present application. When the first methanol crude filter 21 in the first methanol crude filter branch is seriously blocked (i.e., the first pressure difference exceeds the first pressure difference threshold), the first methanol pump 22 is controlled to stop working, and the second methanol pump 32 is controlled to work, so that the methanol supply system is switched from the first methanol crude filter branch to the second methanol crude filter branch. When the second methanol crude filter 31 in the second methanol crude filter branch is seriously blocked (i.e., the second pressure difference exceeds the first pressure difference threshold), the second methanol pump 32 is controlled to stop working, and the first methanol pump 22 is controlled to work, so that the methanol supply system is switched from the second methanol crude filter branch to the first methanol crude filter branch.

[0114] In Figure 1 and Figure 3 On the basis of the embodiments shown in the figures, the methanol supply system can further include a third pressure difference measuring device (not shown in the figures). Figure 1 and Figure 3 ).

[0115] The third pressure difference measuring device is arranged at the inlet and outlet of the methanol fine filter 12, and is used to measure the third pressure difference between the outlet and the inlet of the methanol fine filter 12.

[0116] In practical applications, the third pressure difference measuring device can include a fourth pressure sensor and a fifth pressure sensor.

[0117] The fourth pressure sensor is arranged at the inlet of the methanol fine filter 12, and is used to collect the inlet pressure of the methanol fine filter 12.

[0118] The fifth pressure sensor is arranged at the outlet of the methanol fine filter 12, and is used to collect the outlet pressure of the methanol fine filter 12.

[0119] Correspondingly, the control method of the methanol supply system can further include:

[0120] acquiring the third pressure difference between the outlet and the inlet of the methanol fine filter 12 measured by the third pressure difference measuring device;

[0121] In the case where the third pressure difference exceeds the second pressure difference threshold, outputting prompt information for replacing the methanol fine filter 12.

[0122] The value of the second pressure difference threshold is determined according to actual needs, which is not limited in the present application.

[0123] In summary, the third differential pressure between the outlet and the inlet of the methanol filter 12 is monitored in real time by adding the third differential pressure measuring device to the inlet and outlet of the methanol filter 12. When the third differential pressure exceeds the second differential pressure threshold, it is determined that the methanol filter 12 is seriously blocked, and the engine controller automatically generates a replacement prompt to remind the user to replace the methanol filter 12 in time. Compared with the traditional replacement method or the replacement method after the rail pressure is abnormal, the real-time differential pressure monitoring technology can accurately determine the blocking state of the methanol filter 12 and timely trigger the replacement prompt, thereby effectively ensuring the stable operation of the methanol supply system.

[0124] Corresponding to the control method embodiment of the methanol supply system, the application also discloses a control device of a methanol supply system.

[0125] Referring to Figure 5 The control device of the methanol supply system disclosed in the embodiment of the application is shown in the structure diagram, and the control device is applied to an engine controller. Figure 1 The control device comprises:

[0126] The first differential pressure acquisition unit 201 is used for controlling the first methanol pump 22 to work after the engine is powered on, and acquiring the first differential pressure between the outlet and the inlet of the first methanol filter 21 measured by the first differential pressure measuring device.

[0127] In the embodiment, the first differential pressure measuring device is connected with the engine controller, and the first differential pressure measuring device can output the measured first differential pressure between the outlet and the inlet of the first methanol filter 21 to the engine controller.

[0128] In actual application, when the first differential pressure measuring device comprises the first pressure sensor 23 arranged between the first methanol filter 21 and the first methanol pump 22 and the second pressure sensor 24 arranged between the first methanol filter 21 and the methanol tank 11, the engine controller acquires the outlet pressure of the first methanol filter 21 collected by the first pressure sensor 23 and the inlet pressure of the first methanol filter 21 collected by the second pressure sensor 24, and obtains the first differential pressure by calculating the difference between the outlet pressure and the inlet pressure.

[0129] The first information output unit 202 is used for outputting the prompt information for replacing the first methanol filter 21 when the first differential pressure exceeds the first differential pressure threshold.

[0130] In actual application, the prompt information for replacing the first methanol filter 21 can be output on the instrument panel.

[0131] The value of the first differential pressure threshold is determined according to actual needs, which is not limited in the application.

[0132] In summary, the application discloses a control device of a methanol supply system, when the first pressure difference exceeds the first pressure difference threshold, it is determined that the first methanol coarse filter 21 has been seriously blocked, at this time, the engine controller automatically generates a replacement prompt information to remind the user to replace the first methanol coarse filter 21 in time. Compared with the traditional periodic replacement or replacement after the rail pressure is abnormal, the application can accurately determine the methanol coarse filter blockage state through the real-time pressure difference monitoring technology, and can also timely trigger the replacement prompt, thereby effectively guaranteeing the stable operation of the methanol supply system.

[0133] As shown in Figure 3 When the methanol supply system further comprises a second methanol coarse filter branch, referring to Figure 6 The control device of the methanol supply system disclosed in the embodiment of the application can further comprise:

[0134] The second pressure difference acquisition unit 203 is configured to control the second methanol pump 32 to work and acquire the second pressure difference between the outlet and the inlet of the second methanol coarse filter 31 measured by the second pressure difference measuring device when the first pressure difference does not exceed the first pressure difference threshold.

[0135] The second information output unit 204 is configured to output the prompt information for replacing the second methanol coarse filter 31 when the second pressure difference exceeds the first pressure difference threshold.

[0136] In summary, the application discloses a control device of a methanol supply system, when the first pressure difference exceeds the first pressure difference threshold, it is determined that the first methanol coarse filter 21 has been seriously blocked, at this time, the engine controller automatically generates a replacement prompt information to remind the user to replace the first methanol coarse filter 21 in time. Compared with the traditional periodic replacement or replacement after the rail pressure is abnormal, the application can accurately determine the methanol coarse filter blockage state through the real-time pressure difference monitoring technology, and can also timely trigger the replacement prompt, thereby effectively guaranteeing the stable operation of the methanol supply system.

[0137] In one embodiment, the application further discloses a control system of a methanol supply system, the control system comprising: the methanol supply system and an engine controller.

[0138] When the methanol supply system is as follows Figure 1 As shown, the engine controller is connected to the first methanol pump 22 and the first differential pressure measuring device respectively. When the engine is powered on, it controls the first methanol pump 22 to work and obtains the first differential pressure between the outlet and inlet of the first methanol coarse filter 21 measured by the first differential pressure measuring device. If the first differential pressure exceeds the first differential pressure threshold, it outputs a prompt message to replace the first methanol coarse filter 21.

[0139] When the methanol supply system is as follows Figure 3 As shown, the methanol supply system is in Figure 1 Based on the embodiment shown, it further includes: when the second methanol coarse filter branch is in operation, the engine controller is connected to the second methanol pump 32 and the second differential pressure measuring device respectively, and is used to control the second methanol pump 32 to work when the first differential pressure does not exceed the first differential pressure threshold, and to obtain the second differential pressure between the outlet and inlet of the second methanol coarse filter 31 measured by the second differential pressure measuring device. When the second differential pressure exceeds the first differential pressure threshold, a prompt message to replace the second methanol coarse filter 31 is output.

[0140] It should be noted that in this invention, the pressure relief valves of the first methanol pump 22, the second methanol pump 32, and the common rail 13 are all connected to the methanol tank 11.

[0141] In one embodiment, the methanol supply system may further include: a third differential pressure measuring device;

[0142] The third differential pressure measuring device is connected to both the methanol fine filter and the engine controller.

[0143] The third differential pressure measuring device is used to measure the third differential pressure between the outlet and inlet of the methanol fine filter and output the third differential pressure to the engine controller.

[0144] The engine controller is used to output a prompt message to replace the methanol filter when the third differential pressure exceeds the second differential pressure threshold.

[0145] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0146] The various embodiments described in this specification are presented by way of example, and each embodiment is not necessarily composed of all features described with respect to other embodiments. Each embodiment describes a distinct invention independent of the other embodiments, and each of the individual embodiments can be implemented and used independently of the other embodiments.

[0147] The previous description of the disclosed embodiments is not intended to limit the scope of the application, but is merely intended to describe the ways in which the application can be practiced. Numerous modifications of the embodiments as described herein will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the scope of the application. The present application is thus to be accorded the widest scope encompassed by the foregoing description, including equivalents of the features described in this specification.

Claims

1. A control method of a methanol supply system, characterized by, The application is applied to engine controller, and the methanol supply system comprises a methanol tank (11), a first methanol rough filter branch, a methanol fine filter (12), a common rail pipe (13) and an injector (14) connected in sequence, the first methanol rough filter branch comprises a first methanol rough filter (21), a first methanol pump (22) connected with the first methanol rough filter (21) and a first differential pressure measuring device arranged at the inlet and outlet of the first methanol rough filter (21), and the control method comprises the following steps: When the engine is powered on, the first methanol pump (22) is controlled to work, and the first differential pressure between the outlet and the inlet of the first methanol rough filter (21) measured by the first differential pressure measuring device is obtained; If the first differential pressure exceeds a first differential pressure threshold, prompt information for replacing the first methanol rough filter (21) is outputted.

2. The control method of the methanol supply system according to claim 1, characterized by, If the methanol supply system further comprises a second methanol rough filter branch connected with the methanol tank (11) and the methanol fine filter (12) respectively, the second methanol rough filter branch comprises a second methanol rough filter (31), a second methanol pump (32) connected with the second methanol rough filter (31) and a second differential pressure measuring device arranged at the inlet and outlet of the second methanol rough filter (31), the pressure relief valve of the second methanol pump (32) is connected with the methanol tank (11), and the control method further comprises the following steps: If the first differential pressure does not exceed the first differential pressure threshold, the second methanol pump (32) is controlled to work, and the second differential pressure between the outlet and the inlet of the second methanol rough filter (31) measured by the second differential pressure measuring device is obtained; If the second differential pressure exceeds the first differential pressure threshold, prompt information for replacing the second methanol rough filter (31) is outputted.

3. The control method of the methanol supply system according to claim 2, characterized by, The control method further comprises the following steps: If the first differential pressure exceeds the first differential pressure threshold, the first methanol pump (22) is controlled to stop working, and the second methanol pump (32) is controlled to work; Or, If the second differential pressure exceeds the first differential pressure threshold, the second methanol pump (32) is controlled to stop working, and the first methanol pump (22) is controlled to work.

4. The control method of the methanol supply system according to any one of claims 1 to 3, characterized by If the methanol supply system further comprises a third differential pressure measuring device arranged at the inlet and outlet of the methanol fine filter (12), the control method further comprises the following steps: The third differential pressure between the outlet and the inlet of the methanol fine filter (12) measured by the third differential pressure measuring device is obtained; If the third differential pressure exceeds a second differential pressure threshold, prompt information for replacing the methanol fine filter (12) is outputted.

5. A control device of a methanol supply system characterized by comprising: The application is applied to engine controller, and the methanol supply system comprises a methanol tank (11), a first methanol rough filter branch, a methanol fine filter (12), a common rail pipe (13) and an injector (14) connected in sequence, the first methanol rough filter branch comprises a first methanol rough filter (21), a first methanol pump (22) connected with the first methanol rough filter (21) and a first differential pressure measuring device arranged at the inlet and outlet of the first methanol rough filter (21), and the control device comprises the following steps: The first differential pressure acquisition unit is configured to control the first methanol pump (22) to work after the engine is powered on, and acquire the first differential pressure between the outlet and the inlet of the first methanol coarse filter (21) measured by the first differential pressure measuring device. The first information output unit is configured to output prompt information for replacing the first methanol coarse filter (21) when the first differential pressure exceeds the first differential pressure threshold.

6. The control device of the methanol supply system according to claim 5, characterized by If the methanol supply system further comprises a second methanol coarse filter branch connected to the methanol tank (11) and the methanol fine filter (12), respectively, the second methanol coarse filter branch comprises a second methanol coarse filter (31), a second methanol pump (32) connected to the second methanol coarse filter (31), and a second differential pressure measuring device arranged at the inlet and outlet of the second methanol coarse filter (31), and the control device further comprises: The second differential pressure acquisition unit is configured to control the second methanol pump (32) to work when the first differential pressure does not exceed the first differential pressure threshold, and acquire the second differential pressure between the outlet and the inlet of the second methanol coarse filter (31) measured by the second differential pressure measuring device. The second information output unit is configured to output prompt information for replacing the second methanol coarse filter (31) when the second differential pressure exceeds the first differential pressure threshold.

7. A control system of a methanol supply system, characterized by, It comprises: a methanol supply system and an engine controller; The methanol supply system comprises a methanol tank (11), a first methanol coarse filter branch, a methanol fine filter (12), a common rail pipe (13) and an injector (14) connected in sequence; The first methanol coarse filter branch comprises a first methanol coarse filter (21), a first methanol pump (22) connected to the first methanol coarse filter (21), and a first differential pressure measuring device arranged at the inlet and outlet of the first methanol coarse filter (21); The engine controller is connected to the first methanol pump (22) and the first differential pressure measuring device, respectively, for controlling the first methanol pump (22) to work after the engine is powered on, and acquiring the first differential pressure between the outlet and the inlet of the first methanol coarse filter (21) measured by the first differential pressure measuring device, and outputting prompt information for replacing the first methanol coarse filter (21) when the first differential pressure exceeds the first differential pressure threshold.

8. The control system of the methanol supply system according to claim 7, characterized by, The first differential pressure measuring device comprises a first pressure sensor (23) and a second pressure sensor (24); The first pressure sensor (23) is arranged between the first methanol coarse filter (21) and the first methanol pump (22) to collect the outlet pressure of the first methanol coarse filter (21); The second pressure sensor (24) is arranged between the first methanol coarse filter (21) and the methanol tank (11) to collect the inlet pressure of the first methanol coarse filter (21).

9. The control system of the methanol supply system according to claim 7 or 8, characterized by, The methanol supply system further comprises a second methanol coarse filter branch; The second methanol coarse filter branch is connected with the methanol tank (11) and the methanol fine filter (12) respectively, and comprises a second methanol coarse filter (31), a second methanol pump (32) connected with the second methanol coarse filter (31), and a second differential pressure measuring device arranged at the inlet and outlet of the second methanol coarse filter (31); The engine controller is connected with the second methanol pump (32) and the second differential pressure measuring device respectively, and is configured to control the second methanol pump (32) to work when the first differential pressure does not exceed the first differential pressure threshold, and acquire the second differential pressure between the outlet and the inlet of the second methanol coarse filter (31) measured by the second differential pressure measuring device, and output prompt information for replacing the second methanol coarse filter (31) when the second differential pressure exceeds the first differential pressure threshold.

10. The control system of the methanol supply system according to claim 9, characterized by The second differential pressure measuring device comprises a second pressure sensor (24) and a third pressure sensor (33); The second pressure sensor (24) is arranged in a common passage connected with the second methanol coarse filter (31) and the first methanol coarse filter (21) of the methanol tank (11), and is configured to collect the inlet pressure of the second methanol coarse filter (31) when the first methanol pump (22) stops working and the second methanol pump (32) works; The third pressure sensor (33) is arranged between the second methanol coarse filter (31) and the second methanol pump (32), and is configured to collect the outlet pressure of the second methanol coarse filter (31).

11. The control system of the methanol supply system according to claim 9, characterized by, The pressure relief valves of the first methanol pump (22), the second methanol pump (32) and the common rail pipe (13) are connected with the methanol tank (11).

12. The control system of the methanol supply system according to claim 7 or 8, characterized by, The methanol supply system further comprises a third differential pressure measuring device; The third differential pressure measuring device is connected with the methanol fine filter (12) and the engine controller respectively; The third differential pressure measuring device is configured to measure a third differential pressure between the outlet and the inlet of the methanol fine filter (12) and output the third differential pressure to the engine controller; The engine controller is configured to output prompt information for replacing the methanol fine filter (12) when the third differential pressure exceeds a second differential pressure threshold.

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