Knock suppression control device and method for methanol dual-fuel mode switching

Abstract

The invention relates to the technical field of dual-fuel engines, and provides a methanol dual-fuel mode switching knock suppression control device and method.The methanol dual-fuel mode switching knock suppression control device comprises a temperature sensor used for collecting tail gas temperature data, a fixing mechanism used for fixedly installing the temperature sensor and a master control box used for controlling the knock suppression action; the fixing mechanism comprises a base which is provided with two clamping blocks used for clamping and fixing the temperature sensor; the wedging assembly is used for promoting the two clamping blocks to continuously clamp the temperature sensor; the driving assembly is used for driving the wedging assembly to perform wedging action by utilizing an engine vibration effect; the temperature sensor is clamped through the two clamping blocks, the wedge-caulking assembly is driven to perform wedge-caulking action through the driving assembly by utilizing the vibration effect of an engine, so that the two clamping blocks continuously clamp the temperature sensor, and the temperature sensor is prevented from loosening displacement or even falling off due to vibration of the engine; and the function reliability of the whole knock suppression control device is ensured.

Description

Technical Field

[0001] This invention relates to the field of dual-fuel engine technology, specifically to a knock suppression control device and method for methanol dual-fuel mode switching. Background Technology

[0002] In marine propulsion systems, marine methanol dual-fuel engines have become a key technological path to achieve the shipping industry's energy conservation and emission reduction goals due to their ability to flexibly switch between clean fuel (methanol) and traditional fuel oil. These engines can dynamically switch between methanol fuel mode and fuel oil mode according to operating conditions.

[0003] During the switching and operation of methanol dual-fuel mode, the engine faces a severe knocking challenge due to the significant differences in the physicochemical properties of methanol fuel compared to traditional diesel. To effectively suppress knocking, existing technologies typically employ knock suppression control devices based on multi-sensor fusion. One key technical approach is to install a temperature sensor at the engine exhaust outlet (exhaust temperature is a core parameter reflecting the engine's combustion state; when knocking occurs, the abnormally intense combustion process leads to a sharp rise in exhaust temperature. By monitoring exhaust temperature changes in real time, knocking symptoms can be quickly identified and suppression measures (such as adjusting the ignition advance angle and fuel injection strategy) can be triggered, thereby achieving effective knock control). Currently, temperature sensors installed at the exhaust outlet are mostly rigidly fixed to the measuring point using bolts. However, during the operation of a methanol dual-fuel engine, the strong vibrations generated by the engine itself are transmitted to the exhaust outlet, causing high-frequency mechanical impact on the temperature sensor. This can easily lead to bolt preload attenuation, loosening of the threaded joint, or even failure, causing displacement or deflection of the temperature sensor and resulting in inaccurate measurements. In extreme cases, the sensor may completely detach, causing signal interruption and directly affecting the functional reliability of the entire knock suppression control device.

[0004] Therefore, this invention proposes a knock suppression control device and method for methanol dual-fuel mode switching to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a knock suppression control device and method for methanol dual-fuel mode switching to solve the above-mentioned problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A methanol dual-fuel mode switching knock suppression control device includes a temperature sensor for collecting exhaust gas temperature data, a fixing mechanism for fixing the temperature sensor, and a main control box for controlling the knock suppression action. The fixing mechanism includes: A base, on which two clamping blocks are provided for holding and fixing the temperature sensor; A wedge clamping assembly used to continuously clamp the temperature sensor between the two clamping blocks; A drive assembly that utilizes the vibration effect of the engine to drive the wedging assembly to perform a wedging action.

[0007] In one alternative embodiment: the fixing mechanism further includes a clamping and loosening assembly for driving the two clamping blocks to clamp / loosen. The clamping and loosening assembly includes a first mounting member, two drive rods that can move with the first mounting member to drive the two clamping blocks to perform clamping and loosening actions respectively, a threaded rod that passes through the first mounting member in the form of a threaded engagement, and several first guide rods that slide through the first mounting member. The clamping blocks are provided with wedge-shaped grooves, and the inclined side of the wedge-shaped grooves is provided with slots. One end of the drive rod is provided with a protrusion that slides and engages with the slots.

[0008] In one alternative: the wedge clamping assembly includes a second mounting member located below the first mounting member, the first mounting member having two wedge-shaped members symmetrically and slidably disposed on it with their inclined sides abutting against the second mounting member, a plurality of connecting ropes being provided between the first mounting member and the second mounting member, and two drive rods being disposed on the second mounting member.

[0009] In one alternative embodiment: the drive assembly includes a frame and a linkage rod ball-jointed on the frame. The frame is separately mounted from the engine. A first seat is provided at the engine exhaust end. A second seat is also slidably mounted on the frame. The first seat has a first conical groove, and the second seat has a second conical groove. The two ends of the linkage rod are respectively located in the first conical groove and the second conical groove. The drive assembly also includes a striking component for striking two wedge-shaped pieces. The striking component is driven by the sliding motion of the second seat.

[0010] In one alternative embodiment: the striking component includes a platform and a carrier plate. The carrier plate is provided with several second guide rods that slide through the platform. Two gears corresponding to the wedge-shaped parts are rotatably provided on the platform. A swing arm is provided on the gear. A striking part is provided at the end of the swing arm away from the gear. A first cable is provided between the carrier plate and the second seat, and an elastic element is provided at either end of the first cable. Two racks are provided on the carrier plate that mesh with the gears respectively.

[0011] In one alternative embodiment, the knock suppression control device further includes a dustproof mechanism for protecting the temperature sensing end of the temperature sensor from dust. The dustproof mechanism includes a filter cartridge mounted on a base for covering the temperature sensing end of the temperature sensor and a dust removal assembly for brushing and cleaning the outer surface of the filter cartridge.

[0012] In one alternative embodiment: the base is provided with an insertion port for a temperature sensor to pass through and enter the filter cartridge, the insertion port is provided with a seal, the dust removal assembly includes an L-shaped component rotatably mounted on the filter cartridge, the L-shaped component is provided with bristles that contact the filter surface of the filter cartridge, a torsion spring is provided at the rotatable connection between the L-shaped component and the filter cartridge, the L-shaped component is also provided with a winding wheel, a second cable is wound on the winding wheel, and the movable end of the second cable is connected to the second base body.

[0013] A method for suppressing knocking during methanol dual-fuel mode switching, employing the knock suppression control device for methanol dual-fuel mode switching as described in any of the above technical solutions, includes the following steps: S1: The temperature sensor is fixedly installed at the exhaust end by a fixing mechanism. Specifically, the temperature sensor is clamped by two clamping blocks. The drive component uses the engine vibration effect to drive the wedge clamping component to perform a wedge clamping action, thereby causing the two clamping blocks to continuously clamp the temperature sensor. S2: Collects exhaust gas temperature data through a temperature sensor and transmits it to the main control box for knock logic judgment. Then, the main control box generates control commands to execute suppression actions to achieve engine knock suppression.

[0014] In one alternative: the suppression action performed in step S2 includes: ignition / injection timing delay, methanol injection quantity gradient control, and boost and intake air temperature management.

[0015] Compared with the prior art, the beneficial effects of the embodiments of the present invention are as follows: The temperature sensor is held by two clamping blocks. The drive assembly uses the engine vibration effect to drive the wedge clamping assembly to perform a wedge clamping action, thereby causing the two clamping blocks to continuously clamp the temperature sensor, preventing the temperature sensor from loosening, shifting or even falling off due to engine vibration, and ensuring the functional reliability of the entire knock suppression control device. By setting up a filter cartridge to filter out dust particles, the temperature sensor's sensing end is prevented from being affected by the accumulation of dust particles, thus ensuring accurate temperature measurement. During the upward sliding stroke of the second base, the second cable is pulled, which in turn drives the L-shaped component to rotate, thus cleaning the filter cartridge surface. This ensures that the exhaust gas can normally enter the filter cartridge and be properly measured by the temperature sensor. During the downward sliding stroke of the second base, the L-shaped component rotates and resets under the action of the torsion spring. This cycle continues, keeping the filter cartridge clean and unobstructed.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Furthermore, these drawings and textual descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this application to those skilled in the art through reference to specific embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0019] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0020] Figure 3 This is a top view of the relationship between the two clamping blocks and the temperature sensor in an embodiment of the present invention.

[0021] Figure 4 for Figure 1 Enlarged view of section B in the middle.

[0022] Figure 5 for Figure 1 Enlarged view of point C in the middle.

[0023] Figure 6 for Figure 1 Enlarged view of point D in the middle.

[0024] Figure reference numerals: 1-Exhaust gas emission end, 2-Temperature sensor, 3-Fixing mechanism, 301-Base, 302-Clamping block, 303-Platform, 304-Carrier plate, 305-Elastic element, 306-First cable, 307-Frame, 308-First seat, 309-Second seat, 310-First conical groove, 311-Linkage rod, 312-Second conical groove, 313-Striking element, 314-Wedge groove, 315-Slot, 316-Driver 317-Protrusion, 318-First mounting part, 319-Second mounting part, 320-Wedge-shaped part, 321-First guide rod, 322-Threaded rod, 323-Connecting rope, 324-Swing rod, 325-Gear, 326-Second guide rod, 327-Rack, 4-Dustproof mechanism, 401-Second cable, 402-Filter cartridge, 403-Installation port, 404-Sealing part, 405-L-shaped part, 406-Bristles, 407-Winding and unwinding reel. Detailed Implementation

[0025] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0026] Please see Figure 1 A knock suppression control device for methanol dual-fuel mode switching includes a temperature sensor 2 for collecting exhaust gas temperature data, a fixing mechanism 3 for fixing the temperature sensor 2, and a main control box (not shown in the figure) for controlling the knock suppression action. The fixing mechanism 3 includes: The base 301 is provided with two clamping blocks 302 for clamping and fixing the temperature sensor 2; A wedge clamping assembly used to continuously clamp the temperature sensor 2 between the two clamping blocks 302; A drive assembly that utilizes the vibration effect of the engine to drive the wedging assembly to perform a wedging action.

[0027] It should be noted that the knock suppression control device also includes an in-cylinder knock sensor, an intake manifold pressure and temperature sensor, a crankshaft position sensor, and a methanol fuel rail pressure sensor. The main control box has a built-in corresponding electronic control unit with multiple signal acquisition interfaces, a high-performance microprocessor, and preset control algorithms. It continuously collects and processes signals from each sensor, and through algorithm and logic judgment, generates control commands to execute suppression actions, thereby achieving efficient and adaptive knock suppression. This is existing technology and will not be elaborated here.

[0028] Temperature sensor 2 is fixedly installed at the exhaust gas emission end by fixing mechanism 3. Temperature sensor 2 collects exhaust gas temperature data and transmits it to the main control box for knock logic judgment. Then, the main control box generates control commands to execute suppression actions to suppress engine knock. The specific fixing action of fixing mechanism 3 for temperature sensor 2 is as follows: temperature sensor 2 (terminal) is clamped by two clamping blocks 302. The drive component uses the engine vibration effect to drive the wedge clamping component to perform a wedge clamping action, thereby causing the two clamping blocks 302 to continuously clamp temperature sensor 2, preventing temperature sensor 2 from loosening, displacement or even falling off due to engine vibration, and ensuring the functional reliability of the entire knock suppression control device. In addition, it should be further explained that for other types of sensors installed in different positions on the engine, fixing mechanism 3 can also be used for fixing installation according to the specific installation position, type and applicable conditions of the sensor.

[0029] Please see Figures 1 to 5In one embodiment of the present invention, the fixing mechanism 3 further includes a clamping and loosening assembly for driving the two clamping blocks 302 to clamp / loosen. The clamping and loosening assembly includes a first mounting member 318, two drive rods 316 that can move with the first mounting member 318 to drive the two clamping blocks 302 to perform clamping and loosening actions respectively, a threaded rod 322 that passes through the first mounting member 318 in the form of a threaded engagement, and a plurality of first guide rods 321 that slide through the first mounting member 318. The clamping block 302 is provided with a wedge-shaped groove 314, and a slot 315 is provided on the inclined side of the wedge-shaped groove 314. One end of the drive rod 316 is provided with a protrusion 317 that slides and engages with the slot 315. The clamping block 302 is slidably disposed on the base 301. The wedge clamping assembly includes a second mounting member 319 located below the first mounting member 318. The first mounting member 318 has two wedge-shaped members 320 symmetrically and slidably provided with inclined sides that abut against the second mounting member 319. A plurality of connecting ropes 323 are also provided between the first mounting member 318 and the second mounting member 319. The two drive rods 316 are provided on the second mounting member 319. The drive assembly includes a frame 307 and a linkage rod 311 ball-jointed on the frame 307. The frame 307 is separately mounted from the engine (i.e., the frame 307 does not contact the engine; for example, it is fixed on the side wall of the engine compartment to avoid resonance between the frame 307 and the engine). A first seat 308 is provided at the engine exhaust end. A second seat 309 is also slidably mounted on the frame 307. The first seat 308 has a first conical groove 310, and the second seat 309 has a second conical groove 312. The two ends of the linkage rod 311 are located in the first conical groove 310 and the second conical groove 312, respectively. The length of the rod segment between the ball joint point of the linkage rod 311 and the first seat 308 is less than the length of the rod segment between the ball joint point of the linkage rod 311 and the second seat 309. The lever structure is used to amplify the engine amplitude. The drive assembly also includes a striking component for striking two wedge-shaped pieces 320. The striking component is driven by the sliding motion of the second seat 309. The striking component includes a platform 303 and a carrier plate 304. The carrier plate 304 is provided with several second guide rods 326 that slide through the platform 303. The platform 303 is rotatably provided with two gears 325 that correspond to the wedge-shaped member 320 respectively. The gears 325 are provided with swing rods 324. The end of the swing rod 324 away from the gears 325 is provided with a striking element 313 (the striking element 313 is made of rubber material to avoid damaging the wedge-shaped member 320). A first cable 306 is provided between the carrier plate 304 and the second seat 309. Each end of the first cable 306 is also provided with an elastic element 305 (the elastic element 305 is a spring, elastic rubber column, etc. in the prior art). The carrier plate 304 is provided with two racks 327 that mesh with the gears 325 respectively.

[0030] In this embodiment, rotating the threaded rod 322 moves the first mounting member 318, which in turn moves the second mounting member 319 accordingly, thus achieving the clamping / unclamping action of the two clamping blocks 302. The connecting rope 323 allows the second mounting member 319 to move away from the first mounting member 318 after the first mounting member 318 and the second mounting member 319 are pressed together (i.e., the temperature sensor 2 is clamped and fixed), thereby enabling the second mounting member 319 to perform a wedging action. When the engine vibrates, the upper end of the linkage rod 311 swings back and forth with a large amplitude, thereby driving the second seat 309 to slide up and down. During the upward sliding stroke of the second seat 309, the first cable 306 pulls the carrier plate 304 upward accordingly (to... Figure 1 (Explained from the angle shown) Under the meshing transmission action of rack 327 and gear 325, rack 327 moves upward, driving rocker arm 324 to deflect, thereby causing striking element 313 to strike wedge 320. During the downward stroke of second seat 309, carrier plate 304 moves downward under its own gravity, and the two rocker arms 324 reset accordingly. This cycle is repeated, so that wedge 320 is continuously fed and wedge-tightened, realizing continuous and stable clamping of temperature sensor 2. It should be noted that before clamping temperature sensor 2, the two wedge 320 are moved horizontally towards the corresponding striking element 313, and then the subsequent clamping action is performed to ensure that wedge 320 has sufficient feeding and wedge-tightening distance.

[0031] Please see Figure 1 and Figure 6 In one embodiment of the present invention, the knock suppression control device further includes a dustproof mechanism 4 for preventing dust from the temperature sensing end of the temperature sensor 2. The dustproof mechanism 4 includes a filter cartridge 402 disposed on the base 301 for covering the temperature sensing end of the temperature sensor 2 and a dust removal assembly for brushing and removing dust from the outer surface of the filter cartridge 402. The base 301 is provided with an insertion port 403 through which the temperature sensing end of the temperature sensor 2 enters the filter cartridge 402. The insertion port 403 is provided with a sealing element 404 (the sealing element 404 is an O-ring, rubber ring, etc., to prevent dust particles in the exhaust gas from seeping into the filter cartridge 402 through the gap between the insertion port 403 and the temperature sensing end of the temperature sensor 2). The dust removal assembly includes an L-shaped part 405 rotatably mounted on the filter cartridge 402. The L-shaped part 405 is provided with bristles 406 that contact the filter surface of the filter cartridge 402. A torsion spring (not shown in the figure) is provided at the rotatable connection between the L-shaped part 405 and the filter cartridge 402. The L-shaped part 405 is also provided with a winding wheel 407. A second pull cable 401 is wound on the winding wheel 407. The movable end of the second pull cable 401 is connected to the second base 309. The dust removal assembly also includes several guide wheels for guiding the transmission of the second pull cable 401.

[0032] In this embodiment, since the exhaust gas contains dust particles such as carbon soot, in order to prevent the temperature sensing end of the temperature sensor 2 from being affected by the accumulation of dust particles and thus affecting the accuracy of temperature acquisition, a filter cartridge 402 is set to filter dust particles and prevent dust. During the upward sliding stroke of the second seat 309, the second cable 401 is pulled, which in turn drives the L-shaped part 405 to rotate, thereby cleaning the filter surface of the filter cartridge 402. This ensures that the exhaust gas usually enters the filter cartridge 402 and is properly measured by the temperature sensor 2. During the downward sliding stroke of the second seat 309, the L-shaped part 405 rotates and resets under the action of the torsion spring (in the opposite direction). This cycle is repeated to keep the filter cartridge 402 clean and unobstructed.

[0033] The present invention also provides a knock suppression method for methanol dual-fuel mode switching, and the knock suppression control device for methanol dual-fuel mode switching using any one of the above technical solutions includes the following steps: S1: The temperature sensor 2 is fixedly installed at the exhaust gas emission end by the fixing mechanism 3. Specifically, the temperature sensor 2 is clamped by two clamping blocks 302. The driving component uses the engine vibration effect to drive the wedge clamping component to perform a wedge clamping action, thereby causing the two clamping blocks 302 to continuously clamp the temperature sensor 2. S2: The exhaust gas temperature data is collected by temperature sensor 2 and transmitted to the main control box for knock logic judgment. Then, the main control box generates control commands to execute suppression actions to suppress engine knock.

[0034] The suppression actions described in step S2 include: ignition / injection timing delay (dynamically delaying the ignition or ignition fuel injection time through real-time feedback control to reduce peak combustion pressure and temperature), methanol injection quantity gradient control (using a methanol substitution rate gradual change strategy and knock feedback intervention to achieve a smooth transition of fuel mode), and boost and intake air temperature management (precisely controlling boost pressure and strengthening intercooling to ensure that intake air density and temperature are within the anti-knock safe range).

[0035] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A methanol dual-fuel mode switching knock suppression control device, comprising a temperature sensor (2) for collecting exhaust gas temperature data, a fixing mechanism (3) for fixing the temperature sensor (2), and a main control box for controlling the knock suppression action, characterized in that, The fixing mechanism (3) includes: The base (301) is provided with two clamping blocks (302) for clamping and fixing the temperature sensor (2). A clamping and releasing assembly for driving two clamping blocks (302) to clamp / release, the clamping and releasing assembly includes a first mounting member (318) and two drive rods (316) that can move with the first mounting member (318) to drive the two clamping blocks (302) to perform clamping and releasing actions respectively. A wedge clamping assembly for causing the two clamping blocks (302) to continuously clamp the temperature sensor (2) includes a second mounting member (319) located below the first mounting member (318). The first mounting member (318) has two wedge-shaped members (320) symmetrically and slidably provided with inclined sides abutting against the second mounting member (319). Two drive rods (316) are provided on the second mounting member (319). A drive assembly that utilizes the vibration effect of the engine to drive the wedging assembly to perform a wedging action.

2. The knock suppression control device for methanol dual-fuel mode switching according to claim 1, characterized in that, The clamping assembly also includes a threaded rod (322) that passes through the first mounting member (318) in the form of a threaded engagement and several first guide rods (321) that slide through the first mounting member (318). The clamping block (302) is provided with a wedge-shaped groove (314), and the inclined side of the wedge-shaped groove (314) is provided with a slot (315). One end of the drive rod (316) is provided with a protrusion (317) that slides and engages with the slot (315).

3. The knock suppression control device for methanol dual-fuel mode switching according to claim 1, characterized in that, Several connecting ropes (323) are also provided between the first mounting component (318) and the second mounting component (319).

4. The knock suppression control device for methanol dual-fuel mode switching according to claim 1, characterized in that, The drive assembly includes a frame (307) and a linkage rod (311) ball-jointed on the frame (307). The frame (307) is separated from the engine. The exhaust end of the engine is provided with a first seat (308). The frame (307) is also provided with a second seat (309) that slides up and down. The first seat (308) is provided with a first conical groove (310), and the second seat (309) is provided with a second conical groove (312). The two ends of the linkage rod (311) are respectively located in the first conical groove (310) and the second conical groove (312). The drive assembly also includes a striking component for striking two wedge-shaped pieces (320). The striking component is driven by the second seat (309) sliding up and down.

5. The knock suppression control device for methanol dual-fuel mode switching according to claim 4, characterized in that, The striking component includes a platform (303) and a carrier plate (304). The carrier plate (304) is provided with a plurality of second guide rods (326) that slide through the platform (303). The platform (303) is provided with two gears (325) that correspond to the wedge-shaped piece (320) respectively. The gears (325) are provided with a rocker arm (324). The end of the rocker arm (324) away from the gears (325) is provided with a striking element (313). The carrier plate (304) and the second seat (309) are provided with a first cable (306), and each end of the first cable (306) is also provided with an elastic element (305). The carrier plate (304) is provided with two racks (327) that mesh with the gears (325) respectively.

6. The knock suppression control device for methanol dual-fuel mode switching according to claim 4, characterized in that, The knock suppression control device also includes a dustproof mechanism (4) for protecting the temperature sensing end of the temperature sensor (2) from dust. The dustproof mechanism (4) includes a filter cartridge (402) mounted on a base (301) for covering the temperature sensing end of the temperature sensor (2) and a dust removal assembly for brushing and removing dust from the outer surface of the filter cartridge (402).

7. The knock suppression control device for methanol dual-fuel mode switching according to claim 6, characterized in that, The base (301) is provided with a temperature sensing end for the temperature sensor (2) passing through an insertion port (403) into the filter cartridge (402). The insertion port (403) is provided with a sealing element (404). The dust removal assembly includes an L-shaped part (405) rotatably mounted on the filter cartridge (402). The L-shaped part (405) is provided with bristles (406) that contact the filter surface of the filter cartridge (402). A torsion spring is provided at the rotatable connection between the L-shaped part (405) and the filter cartridge (402). The L-shaped part (405) is also provided with a winding wheel (407). A second cable (401) is wound on the winding wheel (407). The movable end of the second cable (401) is connected to the second base (309).

8. A method for suppressing knock during methanol dual-fuel mode switching, comprising the methanol dual-fuel mode switching knock suppression control device as described in any one of claims 1-7, characterized in that, Includes the following steps: S1: The temperature sensor (2) is fixedly installed at the exhaust gas emission end by the fixing mechanism (3). Specifically, the temperature sensor (2) is clamped by two clamping blocks (302). The driving component uses the engine vibration effect to drive the wedge clamping component to perform a wedge clamping action, thereby causing the two clamping blocks (302) to continuously clamp the temperature sensor (2). S2: The exhaust gas temperature data is collected by the temperature sensor (2) and transmitted to the main control box to participate in the knock logic judgment. Then, the main control box generates control commands to perform suppression actions to achieve engine knock suppression.

9. The method for suppressing knocking during methanol dual-fuel mode switching according to claim 8, characterized in that, The suppression actions described in step S2 include: ignition / injection timing delay, methanol injection quantity gradient control, and boost and intake air temperature management.

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