Cryogenic fuel engine cold-start system, control method, apparatus, device, medium, and vehicle

Abstract

Disclosed in the present invention are a cryogenic fuel engine cold-start system, a control method, an apparatus, a device, a medium, and a vehicle. The cryogenic fuel engine cold-start system comprises: a cryogenic fuel engine, a cryogenic fuel tank, a master controller, a battery, and a cryogenic fuel injector. The cryogenic fuel tank is connected to a feed port of the cryogenic fuel injector; a nozzle of the cryogenic fuel injector is connected to the cryogenic fuel engine, and is used for injecting a cryogenic fuel to the cryogenic fuel engine; the cryogenic fuel engine is provided with an electric heating apparatus communicationally connected to the master controller; the battery is electrically connected to the electric heating apparatus; and the electric heating apparatus at least comprises an air channel heating apparatus. In the present invention, by means of the air channel heating apparatus arranged in an air inlet channel, a cryogenic fuel jet is boiled, thereby solving the cold-start problem of a cryogenic fuel, i.e., solving the cold-start problem of methanol, and matching an extended-range technology route. In addition, compared with the prior art that gasoline is used for heating, the present invention uses the electric heating apparatus, thereby avoiding the problems in the prior art of emission exceedance and emission aftertreatment that need to be considered when gasoline is used for heating.

Description

Low-temperature fuel engine cold start system, control method, device, equipment, medium and vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on January 2, 2024, with application number 202410008742.2 and application name “Methanol engine cold start system, control method, device and vehicle”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present invention relates to the technical field of vehicles, and is related to, but not limited to, a low-temperature fuel engine cold start system, control method, device, equipment, medium and vehicle. Background Art

[0004] Most methanol engines use ignition combustion, where methanol is injected into the combustion chamber through an intake pipe or intake duct, and the mixture is directly ignited by a spark plug arranged in the combustion chamber.

[0005] The amount of heat absorbed by methanol fuel during vaporization of the same mass is three to four times that of gasoline. The high latent heat of vaporization of methanol makes it difficult for methanol fuel to absorb enough heat from the surrounding cold air and cold engine parts in a low-temperature environment to form a combustible mixture, making it difficult for the methanol engine to start cold and difficult to start when the temperature is below 6°C.

[0006] In the prior art, in order to solve the problem of difficult cold start of methanol engines, most of them adopt a dual-fuel injection system (methanol and gasoline) to heat the methanol by burning gasoline.

[0007] However, when cold-starting a large-displacement methanol engine and using a large amount of gasoline for heating, the engine's emissions exceed standards during the cold start process. Using a smaller amount of gasoline can easily lead to engine cold start failure due to insufficient heat. Furthermore, a dual-fuel system introduces inconveniences in vehicle layout and operation, and requires additional gasoline exhaust aftertreatment equipment. Summary of the Invention

[0008] Based on this, it is necessary to provide a low-temperature fuel engine cold start system, control method, device, equipment, medium and vehicle to address the technical problem of difficulty in cold starting of methanol engines in the existing technology.

[0009] The present invention provides a low-temperature fuel engine cold start system, comprising: a low-temperature fuel engine, a low-temperature fuel tank, a main controller, a battery, and a low-temperature fuel injector, wherein the low-temperature fuel tank is connected to a feed port of the low-temperature fuel injector, the nozzle of the low-temperature fuel injector is connected to the low-temperature fuel engine and is used to spray low-temperature fuel into the low-temperature fuel engine, the low-temperature fuel engine is provided with an electric heating device communicatively connected to the main controller, and the battery is electrically connected to the electric heating device;

[0010] The electric heating device includes at least an air duct heating device. The low-temperature fuel engine is provided with an air intake duct connected to the combustion chamber. The low-temperature fuel injector is partially inserted into the air intake duct and connected to the interior of the low-temperature fuel engine. The air duct heating device is fixedly connected to the air intake duct.

[0011] Furthermore, the low-temperature fuel injector includes a low-temperature fuel main injector and a low-temperature fuel auxiliary injector, the low-temperature fuel main injector is partially inserted into the intake duct, and the nozzle direction of the low-temperature fuel main injector points to the valve of the low-temperature fuel engine, the low-temperature fuel auxiliary injector is inserted into the first area of ​​the intake duct, and the nozzle direction of the low-temperature fuel auxiliary injector is inclined to point to the second area of ​​the intake duct opposite to the first area, and the air duct heating device is fixedly set in the first area and the second area.

[0012] Furthermore, the electric heating device includes a water jacket heating device, the low-temperature fuel engine is provided with an engine coolant channel for accommodating engine coolant, and the water jacket heating device is connected in series to the engine coolant channel.

[0013] Furthermore, the engine coolant channel also includes a water pump connected in series with the water jacket heating device.

[0014] Furthermore, it also includes a supercharger, an EGR valve, an EGR cooler, and an EGR mixing valve. The exhaust port of the low-temperature fuel engine is connected to the air inlet of the EGR cooler through the EGR valve, the air outlet of the EGR cooler is connected to the first air inlet of the EGR mixing valve, the air outlet of the supercharger is connected to the second air inlet of the EGR mixing valve, the air outlet of the EGR mixing valve is connected to the air inlet of the low-temperature fuel engine, and the cooling liquid channel of the EGR cooler is connected to the cooling liquid channel of the engine.

[0015] The present invention provides a control method for a low-temperature fuel engine cold start system as described above, comprising:

[0016] When the ambient temperature and the intake air temperature are lower than a first temperature threshold, controlling the electric heating device to heat;

[0017] After the injector temperature at the low-temperature fuel injector position is greater than or equal to a second temperature threshold, controlling the low-temperature fuel injector to inject low-temperature fuel into the low-temperature fuel engine and ignite the low-temperature fuel;

[0018] After the cylinder temperature of the low-temperature fuel engine is greater than or equal to a third temperature threshold, the electric heating device is controlled to stop heating or reduce the heating power of the electric heating device.

[0019] Furthermore, the cryogenic fuel engine is provided with an intake duct communicating with the combustion chamber, the cryogenic fuel injector is partially inserted into the intake duct and communicates with the interior of the cryogenic fuel engine, the cryogenic fuel injector comprises a cryogenic fuel main injector and a cryogenic fuel auxiliary injector, the cryogenic fuel main injector is partially inserted into the intake duct, and the nozzle direction of the cryogenic fuel main injector is directed towards the valve of the cryogenic fuel engine;

[0020] After the temperature of the injector is greater than or equal to a second temperature threshold, controlling the low-temperature fuel injector to inject low-temperature fuel into the low-temperature fuel engine and igniting the low-temperature fuel comprises:

[0021] After the injector temperature is greater than or equal to a second temperature threshold, the low-temperature fuel auxiliary injector is controlled to inject low-temperature fuel into the low-temperature fuel engine and ignite the low-temperature fuel.

[0022] Furthermore, after the cylinder temperature of the low-temperature fuel engine is greater than or equal to a third temperature threshold, controlling the electric heating device to stop heating or reducing the heating power of the electric heating device includes:

[0023] After the cylinder temperature of the low-temperature fuel engine is greater than or equal to a third temperature threshold, the low-temperature fuel main injector is controlled to spray low-temperature fuel into the low-temperature fuel engine, the low-temperature fuel auxiliary injector is stopped from spraying low-temperature fuel, and the electric heating device is controlled to stop heating or reduce the heating power of the electric heating device.

[0024] Furthermore, the electric heating device further includes a water jacket heating device, the low-temperature fuel engine is provided with an engine coolant channel for accommodating engine coolant, the water jacket heating device is connected in series to the engine coolant channel, and when the ambient and intake air temperatures are lower than a first temperature threshold, controlling the electric heating device to heat includes:

[0025] When the ambient and intake air temperatures are lower than a first temperature threshold, the water jacket heating device is controlled to heat, and at the same time or after a period of time, the air duct heating device is controlled to heat.

[0026] Furthermore, the low-temperature fuel engine cold start system further includes a supercharger, an EGR valve, an EGR cooler, and an EGR mixing valve; the exhaust port of the low-temperature fuel engine is connected to the air inlet of the EGR cooler through the EGR valve; the air outlet of the EGR cooler is connected to the first air inlet of the EGR mixing valve; the air outlet of the supercharger is connected to the second air inlet of the EGR mixing valve; the air outlet of the EGR mixing valve is connected to the air inlet of the low-temperature fuel engine; and the cooling liquid channel of the EGR cooler is connected to the engine cooling liquid channel;

[0027] After the injector temperature at the low-temperature fuel injector position is greater than or equal to a second temperature threshold, controlling the low-temperature fuel injector to inject low-temperature fuel into the low-temperature fuel engine and igniting the low-temperature fuel, the method further includes:

[0028] The EGR valve is opened to allow high-temperature exhaust gas to pass through the EGR valve, thereby heating the coolant in the EGR cooler and the intake air.

[0029] The present invention provides a control device for a cold start system of a low-temperature fuel engine as described above, comprising:

[0030] a heating part, configured to control the electric heating device to heat when the ambient and intake air temperatures are lower than a first temperature threshold;

[0031] a low-temperature fuel combustion and heating portion configured to control the low-temperature fuel injector to inject low-temperature fuel into the low-temperature fuel engine and ignite the low-temperature fuel after the injector temperature at the low-temperature fuel injector position is greater than or equal to a second temperature threshold;

[0032] The stabilizing working part is configured to control the electric heating device to stop heating or reduce the heating power of the electric heating device after the cylinder temperature of the low-temperature fuel engine is greater than or equal to a third temperature threshold.

[0033] The present invention provides an electronic device, comprising:

[0034] at least one processor; and,

[0035] a memory communicatively connected to at least one of the processors; wherein,

[0036] The memory stores instructions that can be executed by the at least one processor. The instructions are executed by the at least one processor to enable the at least one processor to perform the control method of the low-temperature fuel engine cold start system as described above.

[0037] The present invention provides a storage medium storing computer instructions. When a computer executes the computer instructions, the storage medium is used to execute all steps of the control method of the cold start system of a low-temperature fuel engine as described above.

[0038] The present invention provides a vehicle, comprising the control device of the cold start system of the low-temperature fuel engine as described above, or the electronic device as described above.

[0039] The low-temperature fuel engine cold start system of the present invention includes a low-temperature fuel engine, a low-temperature fuel tank, a main controller, a battery and a low-temperature fuel injector, wherein the low-temperature fuel tank is connected to the feed port of the low-temperature fuel injector, and the nozzle of the low-temperature fuel injector is connected to the low-temperature fuel engine for spraying low-temperature fuel to the low-temperature fuel engine. The low-temperature fuel engine is provided with an electric heating device that is communicatively connected to the main controller, and the battery is electrically connected to the electric heating device, and the electric heating device includes at least an airway heating device. The present invention solves the problem of low-temperature fuel cold start, that is, solves the problem of methanol cold start, by arranging an airway heating device in the air intake duct to make the low-temperature fuel jet boil. This solves the problem of low-temperature fuel cold start, that is, solves the problem of methanol cold start, and matches the range extension technology route. The low-temperature fuel engine of the present invention can control the exhaust emissions during the cold start process within the standard range by adopting an electric heating device, thereby avoiding the problem of excessive emissions and post-emission treatment.

[0040] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0043] FIG1 is a schematic structural diagram of a cold start system for a low-temperature fuel engine according to an embodiment of the present invention;

[0044] FIG2 is a perspective view of a cryogenic fuel engine according to an embodiment of the present invention;

[0045] FIG3 is a schematic diagram of an air intake duct according to an embodiment of the present invention;

[0046] FIG4 is a partial cross-sectional view of a cryogenic fuel engine according to an embodiment of the present invention;

[0047] FIG5 is a flowchart of a control method for a cold start system of a low-temperature fuel engine as described above according to an embodiment of the present invention;

[0048] FIG6 is a flowchart of a control method for a cold start system of a low-temperature fuel engine as described above according to another embodiment of the present invention;

[0049] 7 is a schematic diagram of a main controller receiving parameters and control components according to another embodiment of the present invention;

[0050] FIG8 is a flowchart of a control method for a cold start system of a low-temperature fuel engine as described above according to a preferred embodiment of the present invention;

[0051] FIG9 is a schematic diagram of a control device for a cold start system of a low-temperature fuel engine as described above according to an embodiment of the present invention;

[0052] FIG10 is a schematic diagram of the hardware structure of an electronic device according to the present invention.

[0053] Marking explanation 1- low-temperature fuel engine; 2- low-temperature fuel tank; 3- main controller; 4- battery; 5- airway heating device; 6- intake duct; 61- first area; 62- second area; 7- low-temperature fuel main injector; 8- low-temperature fuel auxiliary injector; 9- water jacket heating device; 10- water pump; 11- supercharger; 12- EGR valve; 13- EGR cooler; 14- EGR mixing valve; 15- power controller; 16- low-temperature fuel rail; 17- airway metal temperature sensor; 18- engine metal temperature sensor; 19- intake / ambient and intake temperature sensor; 20- spark plug; 21- intake manifold. DETAILED DESCRIPTION

[0054] The following further describes specific embodiments of the present invention with reference to the accompanying drawings. Like components are denoted by like reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inward" and "outward" refer to directions toward or away from the geometric center of a particular component, respectively.

[0055] FIG1 is a schematic structural diagram of a low-temperature fuel engine cold start system according to an embodiment of the present invention, comprising: a low-temperature fuel engine 1, a low-temperature fuel tank 2, a main controller 3, a battery 4, and a low-temperature fuel injector. The low-temperature fuel tank 2 is connected to the feed port of the low-temperature fuel injector, and the nozzle of the low-temperature fuel injector is connected to the low-temperature fuel engine 1 for spraying low-temperature fuel into the low-temperature fuel engine 1. The low-temperature fuel engine 1 is provided with an electric heating device in communication with the main controller 3, and the battery 4 is electrically connected to the electric heating device.

[0056] The electric heating device includes at least an air duct heating device 5. The low-temperature fuel engine 1 is provided with an air intake duct 6 connected to the combustion chamber. The low-temperature fuel injector is partially inserted into the air intake duct 6 and connected to the interior of the low-temperature fuel engine 1. The air duct heating device 5 is fixedly connected to the air intake duct 6.

[0057] Specifically, the cryogenic fuel engine 1 is preferably an M100 cryogenic fuel engine, that is, an engine that uses cryogenic fuel as a single fuel. The cryogenic fuel engine 1 is an existing cryogenic fuel engine, including a cylinder head, a cylinder body, etc. The physical three-dimensional model is shown in Figure 2. Taking a four-cylinder engine with a displacement of 1.5-3.0L as an example, the cylinder head and the cylinder body are both made of aluminum alloy. The cryogenic fuel tank 2 is used to accommodate cryogenic fuel. The cryogenic fuel tank 2 is connected to the feed port of the cryogenic fuel injector through the cryogenic fuel rail 16. The nozzle of the cryogenic fuel injector is connected to the cryogenic fuel engine 1 to spray cryogenic fuel into the cryogenic fuel engine 1.

[0058] It should be noted that the engine in this application may be a range-extended engine.

[0059] In an embodiment of the present application, if the low-temperature fuel is methanol, the low-temperature fuel engine cold start system is specifically a methanol engine cold start system. The methanol engine cold start system includes a methanol engine, a methanol fuel tank, a main controller, a battery, and a methanol injector. The methanol fuel tank is connected to the feed port of the methanol injector. The nozzle of the methanol injector is connected to the methanol engine for injecting methanol into the methanol engine. The methanol engine is provided with an electric heating device that is communicatively connected to the main controller, and the battery is electrically connected to the electric heating device.

[0060] The electric heating device at least includes an air duct heating device. The methanol engine is provided with an air duct connected to the combustion chamber. The methanol injector is partially inserted into the air duct and connected to the interior of the methanol engine. The air duct heating device is fixedly connected to the air duct.

[0061] If the cryogenic fuel is methanol, the cryogenic fuel rail is a methanol rail.

[0062] The low-temperature fuel engine 1 is provided with an electric heating device in communication with a main controller 3. A battery 4 is electrically connected to the electric heating device. The main controller 3 is preferably an electronic control unit (ECU) of the vehicle. The battery 4 is used to power the electric heating device. There may be one or more electric heating devices.

[0063] In some embodiments, the electric heating device is a ceramic or thick film metal heating element to achieve rapid heating.

[0064] A plurality of temperature sensors are provided on the cryogenic fuel engine 1 to obtain temperatures at different locations.

[0065] In some embodiments:

[0066] An airway metal temperature sensor 17 is provided in the airway 6 of the low-temperature fuel engine 1 to detect the temperature of the airway 6;

[0067] An engine metal temperature sensor 18 is provided on the cryogenic fuel engine 1 to detect the cylinder temperature of the cryogenic fuel engine 1;

[0068] An intake air / ambient and intake air temperature sensor 19 is provided at the air intake of the supercharger 11 of the low-temperature fuel engine 1 to detect the intake air, ambient and intake air temperatures.

[0069] When the low-temperature fuel engine 1 is cold started, the working state of the electric heating device is controlled according to the detected temperature, such as starting the electric heating device and / or controlling the heating power of the electric heating device, so that the low-temperature fuel sprayed by the low-temperature fuel injector can ignite and burn at a suitable temperature, thereby achieving a rapid cold start of the low-temperature fuel engine 1.

[0070] As shown in FIG. 2 , the cryogenic fuel engine 1 is provided with an intake duct 6 , which communicates with a combustion chamber of the cryogenic fuel engine 1 .

[0071] As shown in Figures 2 and 3, the low-temperature fuel injector is partially inserted into the intake duct 6 and communicates with the combustion chamber, thereby injecting low-temperature fuel into the combustion chamber.

[0072] The air duct heating device 5 is mainly used to provide heat for fuel vaporization in a low-temperature environment during cold start conditions, such as when the engine speed is between 800-1000 rpm. Preferably, the power of the air duct heating device 5 is greater than 0.5 kW.

[0073] In some embodiments, the gas channel heating device 5 is a coating heater. Preferably, the gas channel heating device 5 is a thick film positive temperature coefficient (PTC) heater.

[0074] The low-temperature fuel engine cold start system of the present invention includes a low-temperature fuel engine 1, a low-temperature fuel tank 2, a main controller 3, a battery 4 and a low-temperature fuel injector. The low-temperature fuel tank 2 is connected to the feed port of the low-temperature fuel injector. The nozzle of the low-temperature fuel injector is connected to the low-temperature fuel engine 1 for spraying low-temperature fuel to the low-temperature fuel engine 1. The low-temperature fuel engine 1 is provided with an electric heating device that is communicatively connected to the main controller 3. The battery 4 is electrically connected to the electric heating device, and the electric heating device includes at least an airway heating device 5. The present invention boils the low-temperature fuel jet by setting the airway heating device 5 in the air intake 6, thereby solving the problem of low-temperature fuel cold start and matching the range extension technology route. At the same time, compared with the prior art that uses gasoline for heating, the present invention avoids the problems of excessive emissions and post-emission treatment that need to be considered when the prior art uses gasoline for heating due to the use of an electric heating device.

[0075] As shown in Figures 1 to 4, there are schematic structural diagrams of a low-temperature fuel engine cold start system according to another embodiment of the present invention, comprising: a low-temperature fuel engine 1, a low-temperature fuel tank 2, a main controller 3, a battery 4, a low-temperature fuel injector, a supercharger 11, an exhaust gas recirculation (EGR) valve 12, an EGR cooler 13 and an EGR mixing valve 14. The low-temperature fuel tank 2 is connected to the feed port of the low-temperature fuel injector, and the nozzle of the low-temperature fuel injector is connected to the low-temperature fuel engine 1 for spraying low-temperature fuel to the low-temperature fuel engine 1. The low-temperature fuel engine 1 is provided with an electric heating device that is communicatively connected to the main controller 3, and the battery 4 is electrically connected to the electric heating device.

[0076] The electric heating device includes an airway heating device 5 and / or a water jacket heating device 9 .

[0077] The low-temperature fuel engine 1 is provided with an intake duct 6 communicating with a combustion chamber, the low-temperature fuel injector is partially inserted into the intake duct 6 and communicates with the interior of the low-temperature fuel engine 1, the air duct heating device 5 is fixedly connected to the intake duct 6, the low-temperature fuel injector includes a low-temperature fuel main injector 7 and a low-temperature fuel auxiliary injector 8, the low-temperature fuel main injector 7 is partially inserted into the intake duct 6, and the nozzle direction of the low-temperature fuel main injector 7 points to the valve of the low-temperature fuel engine 1, the low-temperature fuel auxiliary injector 8 is inserted into the intake duct 6 from a first area 61 of the intake duct 6, and the nozzle direction of the low-temperature fuel auxiliary injector 8 is inclined to point to a second area 62 of the intake duct 6 opposite to the first area 61, and the air duct heating device 5 is fixedly provided in the first area 61 and the second area 62;

[0078] The low-temperature fuel engine 1 is provided with an engine coolant channel for accommodating engine coolant, the water jacket heating device 9 is connected in series to the engine coolant channel, and the engine coolant channel also includes a water pump 10 connected in series to the water jacket heating device 9.

[0079] In the embodiment of the present application, if the low-temperature fuel is methanol, the low-temperature fuel injector is a methanol injector, and the methanol injector includes a methanol main injector and a methanol auxiliary injector.

[0080] The exhaust port of the low-temperature fuel engine 1 is connected to the air inlet of the EGR cooler 13 through the EGR valve 12, the air outlet of the EGR cooler 13 is connected to the first air inlet of the EGR mixing valve 14, the air outlet of the supercharger 11 is connected to the second air inlet of the EGR mixing valve 14, the air outlet of the EGR mixing valve 14 is connected to the air inlet of the low-temperature fuel engine 1, and the cooling liquid channel of the EGR cooler 13 is connected to the engine cooling liquid channel.

[0081] Specifically, the cryogenic fuel engine 1 may also be referred to as a range extender, and is the primary power source. Preferably, the displacement of the cryogenic fuel engine 1 is greater than 1.5L.

[0082] The battery 4 is used for heating and energy storage. Preferably, the capacity of the battery 4 is greater than 3kW*h.

[0083] The cryogenic fuel tank 2 is a fuel storage device that provides cryogenic fuel to the cryogenic fuel injectors via the cryogenic fuel rail 16. Preferably, the capacity of the cryogenic fuel tank 2 is greater than 60L. Preferably, the cryogenic fuel rail 16 is a port injection system that uses low-pressure injection.

[0084] In an embodiment of the present application, if the low-temperature fuel engine is a methanol engine, the exhaust port of the methanol engine is connected to the air inlet of the EGR cooler through the EGR valve, the air outlet of the EGR cooler is connected to the first air inlet of the EGR mixing valve, the air outlet of the supercharger is connected to the second air inlet of the EGR mixing valve, the air outlet of the EGR mixing valve is connected to the air inlet of the methanol engine, and the coolant channel of the EGR cooler is connected to the engine coolant channel. Specifically, the methanol engine can also be called a range extender, which is the main power source. Preferably, the displacement of the methanol engine is greater than 1.5L. The methanol tank is a fuel storage device that provides methanol to the methanol injector through the methanol rail. Preferably, the capacity of the methanol tank is greater than 60L. Preferably, the methanol rail is an airway injection, using low-pressure injection.

[0085] In some embodiments, an airway metal temperature sensor 17 , an engine metal temperature sensor 18 , and an intake / ambient and intake air temperature sensor 19 are further included as three temperature signal input sources.

[0086] Optionally, the detection range of the airway metal temperature sensor 17, the engine metal temperature sensor 18, and the intake / environment and intake air temperature sensor 19 is -50°C to 500°C.

[0087] The main controller 3 is preferably an ECU. The main controller 3 and the power controller 15 form a control system.

[0088] In an embodiment of the present application, if the low-temperature fuel is methanol, the methanol engine cold start system also includes an airway metal temperature sensor, an engine metal temperature sensor, and an intake / ambient and intake temperature sensor as three temperature signal input sources.

[0089] In some embodiments, the battery 4 is electrically connected to the electric heating device through the power controller 15 , and the main controller 3 controls the power controller 15 to control the electric heating device with different heating powers according to the detected temperature.

[0090] Among them, the electric heating device includes an air duct heating device 5, the low-temperature fuel engine 1 is provided with an air intake duct 6 connected to the combustion chamber, the low-temperature fuel injector part is inserted into the air intake duct 6 and connected to the combustion chamber of the low-temperature fuel engine 1, and the air duct heating device 5 is fixedly connected to the air intake duct 6.

[0091] In this embodiment, an airway heating device 5 is provided in the air intake duct 6 to heat the low-temperature fuel jet injected by the low-temperature fuel injector, thereby achieving boiling of the low-temperature fuel jet.

[0092] The low-temperature fuel injector includes a low-temperature fuel main injector 7 and a low-temperature fuel auxiliary injector 8. The low-temperature fuel main injector 7 is partially inserted into the intake duct 6, and the nozzle direction of the low-temperature fuel main injector 7 points to the valve of the low-temperature fuel engine 1. The low-temperature fuel auxiliary injector 8 is inserted into the intake duct 6 from the first area 61 of the intake duct 6, and the nozzle direction of the low-temperature fuel auxiliary injector 8 is inclined to point to the second area 62 in the intake duct 6 opposite to the first area 61. The air duct heating device 5 is fixedly set in the first area 61 and the second area 62.

[0093] Specifically, the low-temperature fuel injector includes a main low-temperature fuel injector 7 and a secondary low-temperature fuel injector 8. The airway heating device 5 includes two airway heating devices 5 disposed in the first region 61 and the second region 62 of the intake duct 6. The main low-temperature fuel injector 7 is the primary injector when the engine is running at speeds greater than 800 r / min, as shown in FIG3 , and employs port injection or direct injection. The secondary low-temperature fuel injector 8 is used in cold start conditions, with its injection direction directed toward the airway heating device 5 in the first region 61 of the intake duct 6 and its refraction direction directed toward the airway heating device 5 in the second region 62 of the intake duct 6.

[0094] In some embodiments, the low-temperature fuel engine 1 is provided with four intake ducts 6 , and the first region 61 and the second region 62 of each intake duct 6 are provided with an air duct heating device 5 .

[0095] Preferably, the injection pressure of the cryogenic fuel main injector 7 and the cryogenic fuel auxiliary injector 8 is 3-10 bar.

[0096] In some embodiments, the first region 61 is the upper region of the air intake duct 6 , and the second region 62 is the lower region of the air intake duct 6 ; or the first region 61 is the lower region of the air intake duct 6 , and the second region 62 is the upper region of the air intake duct 6 .

[0097] Taking a four-cylinder engine with a displacement of 1.5-3.0L as an example, the cylinder head and cylinder block are both made of aluminum alloy. The low-temperature fuel main injector 7 and low-temperature fuel secondary injector 8, with an injection pressure of 6-10 bar, are integrated into the intake duct 6 of the aluminum alloy cylinder head. As shown in Figure 3, the aluminum alloy intake duct 6 has a wall thickness of 4-6mm and is embedded with an air duct heater 5 with a wall thickness of 1-2mm. The air duct heater 5 and the intake duct 6 are contoured. The surface area of ​​the air duct heater 5 is 800-1500mm² for a single cylinder, and 3200-6000mm² for a four-cylinder engine. An insulating layer is provided between the air duct heater 5 and the aluminum alloy cylinder head. The operating temperature of the air duct heater 5 is 150-500°C, while the temperature of the aluminum alloy is less than 150°C.

[0098] Figure 4 is a cross-sectional view of a low-temperature fuel engine along the axis of the low-temperature fuel injector. The black arrow indicates the injection direction of the low-temperature fuel injector. The intake manifold 21 is connected to the intake manifold 6, and the low-temperature fuel main injector 7 and low-temperature fuel auxiliary injector 8 are fixed to the intake manifold 6. The nozzle direction of the low-temperature fuel main injector 7, i.e., the injection direction, is in the direction of the valve, which facilitates airflow organization and mixture combustion. The nozzle direction of the low-temperature fuel auxiliary injector 8 is directed toward the first region 61 of the intake manifold 6. The low-temperature fuel ejected by the low-temperature fuel auxiliary injector 8 transforms into low-temperature fuel vapor after heat exchange and nucleate boiling on the surface of the air manifold heating device 5 in the first region 61. After secondary refraction, it contacts the air manifold heating device 5 in the second region 62 of the intake manifold 6 for further heating, ultimately transforming mostly into low-temperature fuel vapor and high-temperature droplets. This fuel enters the cylinder of the low-temperature fuel engine 1 along with the air during the intake stroke. After a compression ratio of 15-18, it is ignited by the spark plug 20 and burns to produce work.

[0099] In an embodiment of the present application, if the low-temperature fuel is methanol, the methanol engine cold start system further includes a spark plug and an intake manifold.

[0100] This embodiment adds a low-temperature fuel auxiliary injector 8, which is used in cold start conditions. The low-temperature fuel sprayed by the low-temperature fuel auxiliary injector 8 is refracted in the intake duct 6 and heated multiple times, so that most of it becomes low-temperature fuel vapor and high-temperature droplets, which follow the air into the cylinder of the low-temperature fuel engine 1 during the intake stroke to burn and perform work, thereby achieving a rapid cold start of the engine. At the same time, under normal operating conditions, the low-temperature fuel main injector 7 toward the valve sprays low-temperature fuel to provide a normal low-temperature fuel supply. This embodiment uses a single low-temperature fuel, and mainly utilizes low-temperature fuel heating to achieve low-temperature fuel jet boiling, thereby achieving a cold start in a low-temperature environment. By using two sets of injectors, the low-temperature fuel main injector 7 and the low-temperature fuel auxiliary injector 8, the thermal efficiency of cold start and normal operating conditions is optimized.

[0101] The electric heating device further includes a water jacket heating device 9. The low-temperature fuel engine 1 is provided with an engine coolant channel for accommodating engine coolant. The water jacket heating device 9 is provided in the engine coolant channel.

[0102] The jacket water heater 9 primarily heats the engine during cold-start conditions in low-temperature environments. The cryogenic fuel engine 1 has an engine coolant channel containing coolant to cool the engine 1. The jacket water heater 9 can be an existing coolant heater. The jacket water heater 9 is installed in series with the engine coolant channel to heat the coolant within the channel.

[0103] Preferably, the power of the water jacket heating device 9 is >3 kW.

[0104] This embodiment adds a water jacket heating device 9 to heat the engine coolant, thereby increasing the temperature of the low-temperature fuel engine 1 and achieving a rapid cold start of the low-temperature fuel engine 1 .

[0105] The engine coolant passage further includes a water pump 10 connected in series with the water jacket heating device 9 .

[0106] Specifically, the water pump 10 is used to drive the coolant to flow. According to the heating demand, the water pump 10 can be controlled to drive the coolant in the engine coolant channel to flow in a low-speed small circulation, thereby quickly warming up the engine.

[0107] In this embodiment, a water pump 10 is added to the engine coolant channel to achieve rapid warm-up.

[0108] The low-temperature fuel engine cold start system also includes a supercharger 11, an EGR valve 12, an EGR cooler 13, and an EGR mixing valve 14. The exhaust port of the low-temperature fuel engine 1 is connected to the air inlet of the EGR cooler 13 via the EGR valve 12. The outlet of the EGR cooler 13 is connected to the first air inlet of the EGR mixing valve 14. The outlet of the supercharger 11 is connected to the second air inlet of the EGR mixing valve 14. The outlet of the EGR mixing valve 14 is connected to the air inlet of the low-temperature fuel engine 1. The coolant channel of the EGR cooler 13 is connected to the engine coolant channel. The supercharger 11 is a turbocharger that uses exhaust gas energy to increase intake pressure. The EGR valve 12 is used to control the opening and ratio of exhaust gas circulation. The EGR cooler 13 is used to cool the exhaust gas and heat the coolant. The EGR mixing valve 14 is used to control the ratio of EGR to fresh air. The water pump 10 is preferably an electronic water pump for controlling the flow of coolant.

[0109] Specifically, after the high-temperature exhaust passes through the EGR valve 12, it heats the coolant in the coolant channel of the EGR cooler 13. Since the coolant channel of the EGR cooler 13 is connected to the engine coolant channel, the coolant in the coolant channel of the EGR cooler 13 flows back to the engine coolant channel, thereby heating the low-temperature fuel engine 1. At the same time, the supercharger 11 increases the pressure and provides fresh air to the EGR mixing valve 14. The exhaust gas from the EGR cooler 13 is also added to the EGR mixing valve 14, where it is mixed and then enters the low-temperature fuel engine 1. Therefore, the exhaust gas from the EGR cooler 13 also heats the intake air of the low-temperature fuel engine 1.

[0110] In this embodiment, after the high-temperature exhaust gas passes through the ERG valve, on the one hand, the coolant of the EGR cooler 13 is heated, and on the other hand, the intake air of the low-temperature fuel engine 1 is heated, thereby providing another heating method to achieve a rapid cold start of the low-temperature fuel engine 1.

[0111] FIG5 is a flowchart of a control method for a cold start system of a low-temperature fuel engine according to an embodiment of the present invention, which includes:

[0112] Step S501, when the ambient temperature and the intake air temperature are lower than a first temperature threshold, controlling the electric heating device to heat;

[0113] Step S502, after the injector temperature at the low-temperature fuel injector position is greater than or equal to a second temperature threshold, controlling the low-temperature fuel injector to inject low-temperature fuel into the low-temperature fuel engine 1 and ignite;

[0114] Step S503: After the cylinder temperature of the low-temperature fuel engine 1 is greater than or equal to a third temperature threshold, the electric heating device is controlled to stop heating or reduce the heating power of the electric heating device.

[0115] Specifically, this embodiment can be applied to electronic devices with processing capabilities, such as an electronic control unit (ECU) of a vehicle. Preferably, the control method of this embodiment is applied to the main controller 3 shown in FIG1 .

[0116] Specifically, the vehicle inputs a power demand signal to the main controller 3, and the main controller 3 can collect the ambient and intake air temperatures through the intake / environment and intake air temperature sensors 19. When the ambient and intake air temperatures are lower than the first temperature threshold, for example, -20°C, the low-temperature fuel engine 1 is in a cold start condition, and step S501 is executed to control the electric heating device to heat.

[0117] The electric heating device may include an airway heating device 5 and a water jacket heating device 9, and controlling the heating of the electric heating device includes:

[0118] Controlling the airway heating device 5 to heat; or

[0119] Control the water jacket heating device 9 to heat; or

[0120] The air channel heating device 5 and the water jacket heating device 9 are controlled to heat together.

[0121] Then, the injector temperature is detected by the airway metal temperature sensor 17. When the injector temperature at the low-temperature fuel injector position is greater than or equal to the second temperature threshold, that is, the temperature at the low-temperature fuel injector position meets the conditions for low-temperature fuel jet boiling and nucleate boiling, step S502 is executed to control the low-temperature fuel injector to inject low-temperature fuel into the low-temperature fuel engine 1 and ignite it.

[0122] Afterwards, the cylinder temperature of the low-temperature fuel engine 1 is detected by the engine metal temperature sensor 18. After the cylinder temperature is greater than or equal to the third temperature threshold, step S503 is executed to control the electric heating device to stop heating or reduce the heating power of the electric heating device to perform normal power output >800r / min.

[0123] This embodiment uses an electric heating device for heating, so that the low-temperature fuel engine 1 meets the conditions of low-temperature fuel jet boiling and nucleate boiling, realizes the cold start of the low-temperature fuel engine 1, and achieves the purpose of rapid warm-up and high efficiency.

[0124] FIG6 is a flowchart showing a control method for a cold start system of a low-temperature fuel engine as described above in another embodiment of the present invention, wherein the electric heating device further includes a water jacket heating device 9, the low-temperature fuel engine 1 is provided with an engine coolant passage for accommodating engine coolant, the water jacket heating device 9 is connected in series to the engine coolant passage, the low-temperature fuel engine 1 is provided with an intake passage 6 communicating with a combustion chamber, the low-temperature fuel injector is partially inserted into the intake passage 6 and communicates with the interior of the low-temperature fuel engine 1, the low-temperature fuel injector includes a low-temperature fuel main injector 7 and a low-temperature fuel auxiliary injector 8, the low-temperature fuel main injector 7 is partially inserted into the intake passage 6, and the low-temperature fuel main injector 8 is connected to the low-temperature fuel auxiliary injector 8. The nozzle direction of the injector 7 points to the valve of the low-temperature fuel engine 1. The low-temperature fuel engine cold start system also includes a supercharger 11, an EGR valve 12, an EGR cooler 13, and an EGR mixing valve 14. The exhaust port of the low-temperature fuel engine 1 is connected to the air inlet of the EGR cooler 13 through the EGR valve 12, the air outlet of the EGR cooler 13 is connected to the first air inlet of the EGR mixing valve 14, the air outlet of the supercharger 11 is connected to the second air inlet of the EGR mixing valve 14, the air outlet of the EGR mixing valve 14 is connected to the air inlet of the low-temperature fuel engine 1, and the coolant channel of the EGR cooler 13 is connected to the engine coolant channel. The method includes:

[0125] Step S601 , when the ambient and intake air temperatures are lower than a first temperature threshold, the water jacket heating device 9 is controlled to heat, and at the same time or after a period of time, the air duct heating device 5 is controlled to heat.

[0126] Step S602: After the injector temperature is greater than or equal to a second temperature threshold, control the low-temperature fuel auxiliary injector 8 to inject low-temperature fuel into the low-temperature fuel engine 1 and ignite the low-temperature fuel.

[0127] Step S603 , opening the EGR valve 12 so that the high-temperature exhaust gas passes through the EGR valve 12 , thereby heating the coolant in the EGR cooler 13 and the intake air.

[0128] Step S604, after the cylinder temperature of the low-temperature fuel engine 1 is greater than or equal to the third temperature threshold, control the low-temperature fuel main injector 7 to inject low-temperature fuel into the low-temperature fuel engine 1, stop the low-temperature fuel auxiliary injector 8 from injecting low-temperature fuel, and control the electric heating device to stop heating or reduce the heating power of the electric heating device.

[0129] Specifically, Figure 7 shows a schematic diagram of parameters and control components received by the main controller 3. The main controller 3 receives a power demand signal, an airway temperature T1 from an airway metal temperature sensor 17, an engine body metal temperature T2 from an engine metal temperature sensor 18, and an ambient temperature T3 from an intake / ambient and intake air temperature sensor 19.

[0130] The vehicle inputs a power demand signal to the main controller 3. The main controller 3 collects the ambient and intake air temperatures through the intake / environment and intake air temperature sensors 19. If the ambient and intake air temperatures are less than a first temperature threshold, for example, -20°C, it is determined that the vehicle is in a cold start condition, and step S601 is executed to control the water jacket heating device 9 to heat up. At the same time or after a period of time, the air duct heating device 5 is controlled to heat up.

[0131] The injector temperature is then detected by the airway metal temperature sensor 17. When the injector temperature at the low-temperature fuel injector position is greater than or equal to the second temperature threshold, that is, the temperature at the low-temperature fuel injector position meets the conditions for low-temperature fuel jet boiling and nucleate boiling, step S602 is executed to control the low-temperature fuel injector to inject low-temperature fuel into the low-temperature fuel engine 1. Following the intake stroke, the mixture enters the combustion chamber, is compressed, and ignites and burns, outputting power and simultaneously heating the low-temperature fuel engine 1.

[0132] Then, step S603 is executed to open the EGR valve 12 so that the high-temperature exhaust gas passes through the EGR valve 12 to heat the coolant in the EGR cooler 13 and the intake air.

[0133] Afterwards, the cylinder temperature of the low-temperature fuel engine 1 is detected by the engine metal temperature sensor 18. After the cylinder temperature is greater than or equal to the third temperature threshold, step S604 is executed to control the low-temperature fuel main injector 7 to inject low-temperature fuel to the low-temperature fuel engine 1, stop the low-temperature fuel auxiliary injector 8 from injecting low-temperature fuel, and control the electric heating device to stop heating or reduce the heating power of the electric heating device to perform normal power output >800r / min.

[0134] This embodiment mainly utilizes the airway heating device 5, in conjunction with the water jacket heating device 9 and EGR technology to achieve rapid low-temperature cold start, and can control the combination ratio of these three methods to achieve the purpose of rapid warm-up and high efficiency.

[0135] FIG8 is a flowchart of a control method for a cold start system of a low-temperature fuel engine as described above according to a preferred embodiment of the present invention, comprising:

[0136] In step S801, the vehicle inputs a power demand signal to the main controller 3. The main controller 3 collects the ambient and intake air temperatures T3 through the intake / ambient and intake air temperature sensors 19. If the ambient and intake air temperatures T3 are less than a first temperature threshold, for example, -20°C, it is determined that the vehicle is in a cold start condition and step S802 is executed.

[0137] In step S802, the main controller 3 controls the battery 4 and the power controller 15 based on the information obtained in step S801 to activate the water jacket heater 9 to heat the coolant and activate the electronic water pump 10 to perform a low-speed, small-cycle, rapid warm-up. Preferably, the cold-start speed of the water pump 10 is 100-500 rpm.

[0138] At step S803, simultaneously or after a period of time, the main controller 3 controls the battery 4 and the power controller 15 based on the information obtained in step S801, and starts the gas channel heating device 5 to quickly heat the gas channel until the gas channel temperature T1 received from the gas channel metal temperature sensor 17 reaches the second temperature threshold, wherein the second temperature threshold satisfies the conditions of jet boiling and nucleate boiling of the low-temperature fuel, the second temperature threshold is 100-240°C, and the interval time is 20-200s;

[0139] Step S804: When T1 reaches the second temperature value, the low-temperature fuel auxiliary injector 8 is started to inject low-temperature fuel. The low-temperature fuel injected during the cold start follows the intake stroke, and the mixture enters the combustion chamber for compression, wherein the compression ratio is preferably 15-22;

[0140] Step S805: After the low-temperature fuel mixture is compressed, it is ignited and burned by the spark plug 20. The output power simultaneously heats the low-temperature fuel engine 1. After combustion, the main controller 3 controls the EGR valve 12 and the EGR mixing valve 14 to open, and the high-temperature EGR gas participates in the next cycle of combustion. At the same time, the coolant in the EGR cooler 13 heats the engine body. Preferably, the EGR ratio is 5-20%.

[0141] Step S806: Under the action of the water jacket heating device 9, low-temperature fuel combustion, and EGR coolant heating, the metal temperature T2 of the engine body is raised to a third temperature threshold within a set start-up time. Preferably, the cold start time is 100-200 seconds, and the third temperature threshold is 30-50°C.

[0142] Step S807, receiving the engine body metal temperature T2 from the engine metal temperature sensor 18 and inputting it into the main controller 3, after T2 reaches the third temperature threshold, the low-temperature fuel main injector 7 meets the stable operation state, then the injection of the low-temperature fuel auxiliary injector 8 is stopped, and the low-temperature fuel main injector 7 is started, and the normal power output is >800r / min, and at the same time the power controller 15 reduces the output of the heating power.

[0143] This embodiment has three specific ways to heat the low-temperature fuel engine 1 until the low-temperature fuel main injector 7 can spray and burn normally: first, the battery 4 and the power controller 15 are controlled to start the water jacket heating device 9 to heat the coolant, and the electronic water pump 10 is started to perform a low-speed small cycle rapid warm-up; second, at the same time or after a period of time, the main controller 3 controls the battery 4 and the power controller 15, starts the airway heating device 5 to quickly heat up to the conditions that meet the low-temperature fuel jet boiling and nucleate boiling, and then starts the low-temperature fuel auxiliary injector 8 to spray, following the intake stroke, the mixture enters the combustion chamber, is compressed, ignited and burned, and the output power simultaneously heats the range extender; third, after the high-temperature exhaust passes through the EGR valve 12, the coolant of the EGR cooler 13 is heated, and the intake air is heated.

[0144] In addition, if the purpose is to speed up the combustion, the heating power input of the gas channel heating device 5 can be reduced to maximize the efficiency of the balanced system.

[0145] After the metal temperature of the engine body rises to a temperature condition where the low-temperature fuel main injector 7 can spray and burn normally, the injection of the low-temperature fuel auxiliary injector 8 is stopped, and the low-temperature fuel main injector 7 is started to perform normal power output>800r / min.

[0146] This embodiment utilizes the above three methods, or a flexible combination thereof (the first method is optional), to achieve a rapid cold start of the low-temperature fuel engine 1. By primarily controlling low-temperature fuel heating and jet boiling, combined with control of the water jacket heater 9 and EGR technology, a cold start of the M100 low-temperature fuel engine is achieved while also maintaining thermal efficiency.

[0147] Based on the same inventive concept, FIG9 is a schematic diagram of a control device for a cold start system of a low-temperature fuel engine as described above according to an embodiment of the present invention, comprising:

[0148] The heating part 901 is configured to control the electric heating device to heat when the ambient temperature and the intake air temperature are lower than a first temperature threshold;

[0149] The low-temperature fuel combustion and heating part 902 is configured to control the low-temperature fuel injector to inject low-temperature fuel into the low-temperature fuel engine 1 and ignite the low-temperature fuel after the injector temperature at the low-temperature fuel injector position is greater than or equal to a second temperature threshold;

[0150] The stabilizing working part 903 is configured to control the electric heating device to stop heating or reduce the heating power of the electric heating device after the cylinder temperature of the low-temperature fuel engine 1 is greater than or equal to a third temperature threshold.

[0151] This embodiment uses an electric heating device for heating, so that the low-temperature fuel engine 1 meets the conditions of low-temperature fuel jet boiling and nucleate boiling, realizes the cold start of the low-temperature fuel engine 1, and achieves the purpose of rapid warm-up and high efficiency.

[0152] In one embodiment, the cryogenic fuel engine 1 is provided with an intake duct 6 communicating with the combustion chamber, the cryogenic fuel injector is partially inserted into the intake duct 6 and communicates with the interior of the cryogenic fuel engine 1, the cryogenic fuel injector includes a cryogenic fuel main injector 7 and a cryogenic fuel auxiliary injector 8, the cryogenic fuel main injector 7 is partially inserted into the intake duct 6, and the nozzle direction of the cryogenic fuel main injector 7 is directed towards the valve of the cryogenic fuel engine 1;

[0153] After the temperature of the injector is greater than or equal to a second temperature threshold, controlling the low-temperature fuel injector to inject low-temperature fuel into the low-temperature fuel engine 1 and igniting the low-temperature fuel includes:

[0154] After the injector temperature is greater than or equal to a second temperature threshold, the low-temperature fuel auxiliary injector 8 is controlled to inject low-temperature fuel into the low-temperature fuel engine 1 and ignite the low-temperature fuel.

[0155] In one embodiment, after the cylinder temperature of the low-temperature fuel engine 1 is greater than or equal to a third temperature threshold, controlling the electric heating device to stop heating or reducing the heating power of the electric heating device includes:

[0156] After the cylinder temperature of the low-temperature fuel engine 1 is greater than or equal to the third temperature threshold, the low-temperature fuel main injector 7 is controlled to inject low-temperature fuel into the low-temperature fuel engine 1, the low-temperature fuel auxiliary injector 8 is stopped from injecting low-temperature fuel, and the electric heating device is controlled to stop heating or reduce the heating power of the electric heating device.

[0157] In one embodiment, the electric heating device further includes a water jacket heating device 9. The low-temperature fuel engine 1 is provided with an engine coolant channel for accommodating engine coolant. The water jacket heating device 9 is connected in series to the engine coolant channel. When the ambient and intake air temperatures are lower than a first temperature threshold, controlling the electric heating device to heat includes:

[0158] When the ambient and intake air temperatures are lower than a first temperature threshold, the water jacket heating device 9 is controlled to heat, and simultaneously or after a period of time, the airway heating device 5 is controlled to heat.

[0159] In one embodiment, the low-temperature fuel engine cold start system further includes a supercharger 11, an EGR valve 12, an EGR cooler 13, and an EGR mixing valve 14. The exhaust port of the low-temperature fuel engine 1 is communicated with the air inlet of the EGR cooler 13 through the EGR valve 12, the air outlet of the EGR cooler 13 is communicated with the first air inlet of the EGR mixing valve 14, the air outlet of the supercharger 11 is communicated with the second air inlet of the EGR mixing valve 14, the air outlet of the EGR mixing valve 14 is communicated with the air inlet of the low-temperature fuel engine 1, and the cooling liquid channel of the EGR cooler 13 is communicated with the engine cooling liquid channel;

[0160] The device further includes an EGR control portion configured to:

[0161] The EGR valve 12 is opened, so that high-temperature exhaust gas passes through the EGR valve 12 , thereby heating the coolant in the EGR cooler 13 and the intake air.

[0162] Regarding the apparatus in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0163] FIG10 is a schematic diagram of the hardware structure of an electronic device according to the present invention, comprising:

[0164] at least one processor 1001; and,

[0165] A memory 1002 in communication with at least one of the processors 1001; wherein,

[0166] The memory 1002 stores instructions that can be executed by at least one of the processors. The instructions are executed by at least one of the processors to enable the at least one processor to execute the control method of the low-temperature fuel engine cold start system as described above.

[0167] FIG10 takes a processor 1001 as an example.

[0168] The electronic device may further include: an input device 1003 and a display device 1004 .

[0169] The processor 1001, the memory 1002, the input device 1003 and the display device 1004 may be connected via a bus or other means, with the figure taking the bus connection as an example.

[0170] Memory 1002, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as the program instructions / modules corresponding to the control method for a low-temperature fuel engine cold-start system in the embodiments of the present application, for example, the method flows shown in Figures 5 and 6. Processor 1001 executes the non-volatile software programs, instructions, and modules stored in memory 1002 to perform various functional applications and data processing, thereby implementing the control method for a low-temperature fuel engine cold-start system in the above-mentioned embodiments.

[0171] Memory 1002 may include a program storage area and a data storage area. The program storage area may store an operating system and application programs required for at least one function; the data storage area may store data generated based on the use of the control method for the cold-start system for a low-temperature fuel engine. Furthermore, memory 1002 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state memory device. In some embodiments, memory 1002 may optionally include memory remote from processor 1001. Such remote memory may be connected to a device executing the control method for the cold-start system for a low-temperature fuel engine via a network. Examples of such networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0172] The input device 1003 can receive user clicks and generate signal input related to user settings and function control of the control method of the low-temperature fuel engine cold start system. The display device 1004 can include a display device such as a display screen.

[0173] The one or more modules are stored in the memory 1002 and, when executed by the one or more processors 1001 , execute the control method of the low-temperature fuel engine cold start system in any of the above method embodiments.

[0174] This embodiment uses an electric heating device for heating, so that the low-temperature fuel engine meets the conditions of low-temperature fuel jet boiling and nucleate boiling, realizes the cold start of the low-temperature fuel engine, and achieves the purpose of rapid warm-up and high efficiency.

[0175] An embodiment of the present invention provides a storage medium storing computer instructions. When a computer executes the computer instructions, the storage medium is used to execute all steps of the control method of the low-temperature fuel engine cold start system as described above.

[0176] In the context of the present application, a storage medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. The storage medium may be a machine-readable signal medium or a machine-readable storage medium. Alternatively, the storage medium may be a non-transitory computer-readable storage medium, for example, a non-transitory computer-readable storage medium may be a ROM, a random access memory (RAM), a compact disc read-only memory (CD-ROM), a magnetic tape, a floppy disk, an optical data storage device, or the like.

[0177] One embodiment of the present invention provides a vehicle comprising a control device for a low-temperature fuel engine cold-start system as described above, or an electronic device as described above. It will be appreciated that the vehicle may also include a processor, a memory, and a computer program. The computer program is stored in the memory and configured to be executed by the processor to implement the control method for a low-temperature fuel engine cold-start system provided in the embodiment of the present application. The processor and memory have already been described in the embodiment shown in FIG6 and are not further described here.

[0178] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims. Industrial Applicability

[0179] The embodiments of the present application provide a low-temperature fuel engine cold start system, control method, device, equipment, medium and vehicle. The low-temperature fuel engine cold start system includes: a low-temperature fuel engine, a low-temperature fuel tank, a main controller, a battery and a low-temperature fuel injector. The low-temperature fuel tank is connected to the feed port of the low-temperature fuel injector. The nozzle of the low-temperature fuel injector is connected to the low-temperature fuel engine for spraying low-temperature fuel to the low-temperature fuel engine. The low-temperature fuel engine is provided with an electric heating device that is communicatively connected to the main controller. The battery is electrically connected to the electric heating device. The electric heating device includes at least an airway heating device. The present invention solves the problem of low-temperature fuel cold start, that is, solves the problem of methanol cold start, matches the range extension technology route, and because the low-temperature fuel engine uses an electric heating device, it can control the exhaust emissions during the cold start process within the standard range, avoiding excessive emissions and emission post-treatment problems.

Claims

1. A cold start system for a low-temperature fuel engine, comprising: A cryogenic fuel engine, a cryogenic fuel tank, a main controller, a battery, and a cryogenic fuel injector. The cryogenic fuel tank is connected to the inlet of the cryogenic fuel injector. The nozzle of the cryogenic fuel injector is connected to the cryogenic fuel engine and is used to spray cryogenic fuel into the cryogenic fuel engine. The cryogenic fuel engine is provided with an electric heating device communicatively connected to the main controller, and the battery is electrically connected to the electric heating device; The electric heating device at least includes an air passage heating device. The cryogenic fuel engine is provided with an intake passage communicating with the combustion chamber. The cryogenic fuel injector is partially inserted into the intake passage and communicates with the inside of the cryogenic fuel engine. The air passage heating device is fixedly connected to the intake passage.

2. The cold start system for a cryogenic fuel engine according to claim 1, wherein, The cryogenic fuel injector includes a cryogenic fuel main injector and a cryogenic fuel sub-injector. The cryogenic fuel main injector is partially inserted into the intake passage, and the nozzle direction of the cryogenic fuel main injector points to the valve of the cryogenic fuel engine. The cryogenic fuel sub-injector is inserted into the first area of the intake passage, and the nozzle direction of the cryogenic fuel sub-injector is inclined to point to the second area of the intake passage opposite to the first area. The air passage heating device is fixedly arranged in the first area and the second area.

3. The cold start system for a cryogenic fuel engine according to claim 1, wherein, The electric heating device further includes a water jacket heating device. The cryogenic fuel engine is provided with an engine coolant passage for accommodating engine coolant, and the water jacket heating device is connected in series in the engine coolant passage.

4. The cold start system for a cryogenic fuel engine according to claim 3, wherein, The engine coolant passage further includes a water pump connected in series with the water jacket heating device.

5. The cold start system for a cryogenic fuel engine according to claim 3, wherein, It further includes a supercharger, an EGR valve, an EGR cooler, and an EGR mixing valve. The exhaust port of the cryogenic fuel engine is communicated with the inlet of the EGR cooler through the EGR valve. The outlet of the EGR cooler is communicated with the first inlet of the EGR mixing valve. The outlet of the supercharger is communicated with the second inlet of the EGR mixing valve. The outlet of the EGR mixing valve is communicated with the inlet of the cryogenic fuel engine. The coolant passage of the EGR cooler is communicated with the engine coolant passage.

6. A control method for a cold start system of a cryogenic fuel engine according to any one of claims 1 to 5, including: When the ambient and intake air temperatures are lower than the first temperature threshold, controlling the electric heating device to heat; After the injector temperature at the position of the cryogenic fuel injector is greater than or equal to the second temperature threshold, controlling the cryogenic fuel injector to inject cryogenic fuel into the cryogenic fuel engine and ignite; After the cylinder block temperature of the cryogenic fuel engine is greater than or equal to the third temperature threshold, controlling the electric heating device to stop heating or reducing the heating power of the electric heating device.

7. The control method of the cold start system of a cryogenic fuel engine according to claim 6, wherein, The low-temperature fuel engine is provided with an air inlet passage communicating with the combustion chamber. The low-temperature fuel injector is partially inserted into the air inlet passage and communicates with the interior of the low-temperature fuel engine. The low-temperature fuel injector includes a low-temperature fuel main injector and a low-temperature fuel auxiliary injector. The low-temperature fuel main injector is partially inserted into the air inlet passage, and the nozzle direction of the low-temperature fuel main injector points to the valve of the low-temperature fuel engine. After the temperature of the injector is greater than or equal to the second temperature threshold, controlling the low-temperature fuel injector to inject low-temperature fuel into the low-temperature fuel engine and ignite, includes: After the temperature of the injector is greater than or equal to the second temperature threshold, controlling the low-temperature fuel auxiliary injector to inject low-temperature fuel into the low-temperature fuel engine and ignite.

8. The control method of the cold start system of the cryogenic fuel engine according to claim 7, wherein, After the cylinder block temperature of the low-temperature fuel engine is greater than or equal to the third temperature threshold, controlling the electric heating device to stop heating or reduce the heating power of the electric heating device, includes: After the cylinder block temperature of the low-temperature fuel engine is greater than or equal to the third temperature threshold, controlling the low-temperature fuel main injector to inject low-temperature fuel into the low-temperature fuel engine, stopping the low-temperature fuel auxiliary injector from injecting low-temperature fuel, and controlling the electric heating device to stop heating or reduce the heating power of the electric heating device.

9. The control method of the cold start system of the low-temperature fuel engine according to claim 6, wherein, The electric heating device further includes a water jacket heating device. The low-temperature fuel engine is provided with an engine coolant passage for accommodating engine coolant. The water jacket heating device is connected in series in the engine coolant passage. When the ambient and intake air temperatures are lower than the first temperature threshold, controlling the electric heating device to heat, includes: When the ambient and intake air temperatures are lower than the first temperature threshold, controlling the water jacket heating device to heat, and at the same time or after an interval, controlling the air passage heating device to heat.

10. The control method of the cold start system of a cryogenic fuel engine according to claim 6, wherein, The low-temperature fuel engine cold start system further includes a supercharger, an EGR valve, an EGR cooler, and an EGR mixing valve. The exhaust port of the low-temperature fuel engine is communicated with the intake port of the EGR cooler through the EGR valve. The outlet of the EGR cooler is communicated with the first intake port of the EGR mixing valve. The outlet of the supercharger is communicated with the second intake port of the EGR mixing valve. The outlet of the EGR mixing valve is communicated with the intake port of the low-temperature fuel engine. The coolant passage of the EGR cooler is communicated with the engine coolant passage. After the temperature of the injector at the position of the low-temperature fuel injector is greater than or equal to the second temperature threshold, and after controlling the low-temperature fuel injector to inject low-temperature fuel into the low-temperature fuel engine and ignite, the method further includes: Opening the EGR valve, so that after the high-temperature exhaust gas passes through the EGR valve, heating the coolant of the EGR cooler and heating the intake air.

11. A control device for a low-temperature fuel engine cold start system according to any one of claims 1 to 5, includes: A heating part, configured to control the electric heating device to heat when the ambient and intake air temperatures are lower than the first temperature threshold. The low-temperature fuel combustion heating part is configured to control the low-temperature fuel injector to inject low-temperature fuel into the low-temperature fuel engine and ignite after the injector temperature at the position of the low-temperature fuel injector is greater than or equal to the second temperature threshold; The stable operation part is configured to control the electric heating device to stop heating or reduce the heating power of the electric heating device after the cylinder block temperature of the low-temperature fuel engine is greater than or equal to the third temperature threshold.

12. An electronic device, comprising: At least one processor; And, A memory communicatively connected to at least one of the processors; wherein, The memory stores instructions executable by at least one of the processors, and the instructions are executed by at least one of the processors so that at least one of the processors can execute the control method of the cold start system of the low-temperature fuel engine according to any one of claims 6 to 10.

13. A storage medium stores computer instructions, and when a computer executes the computer instructions, it is used to execute all steps of the control method of the cold start system of the low-temperature fuel engine according to any one of claims 6 to 10.

14. A vehicle includes the cold start system of the low-temperature fuel engine according to any one of claims 1-5.

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