A method for reducing the temperature of an oil head of an oil injector and related device

Abstract

The application discloses a fuel injector head temperature reduction method and related device, applied to the engine technical field, including responding to the engine braking request, controlling the engine to be in the braking mode, when detecting that the engine continuous running number exceeds the preset number of revolutions, controlling the engine cylinder in the braking state to be switched to the motoring state, and sequentially controlling each engine cylinder corresponding to the fuel injector in the motoring state to spray the preset fuel injection amount to reduce the fuel injector head temperature, and when the temperature reduction of all fuel injector heads is completed, controlling the engine to return to the braking mode. When the engine is controlled to be in the braking mode, and the engine continuous running number exceeds the preset number of revolutions is detected, it is determined that the fuel injector head temperature exceeds the temperature limit value, the engine cylinder in the braking state is switched to the motoring state, and the single-cylinder fuel injector is controlled to spray a small amount of oil to reduce the fuel injector head temperature, thereby effectively improving the service life of the fuel injector and the reliability of other engine parts.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engine technology, and more particularly, to a method for reducing the temperature of an oil head of an oil injector and related device. BACKGROUND

[0002] Engine cylinder braking is a way to provide auxiliary braking force by an engine. A user opens an auxiliary braking switch on a vehicle to make the engine provide a large negative torque, which makes the vehicle speed decrease to achieve the purpose of slowing down and reduce the pressure of the main brake system. At present, the demand for engine cylinder braking in the tractor market is increasing, including increasing the braking power, increasing the brake cylinder pressure, increasing the braking frequency, and even replacing the hydraulic retarder with engine cylinder braking for some vehicles.

[0003] At present, for the working conditions of heavy load downhill in mountainous areas, the engine cylinder braking is frequently opened, and the duration of each braking opening is also increased. With the increase of the brake cylinder pressure, the cylinder temperature during braking also increases. At the same time, since the oil injector of the engine does not inject oil during braking, the head of the oil injector exceeds the allowable temperature for use due to the inability to cool by injection, which leads to the deterioration of the oil injector and further affects the working reliability of the engine, for example, causing the piston of the engine to melt. SUMMARY

[0004] Therefore, the present application discloses a method for reducing the temperature of an oil head of an oil injector and related device to reduce the temperature of the oil head of the oil injector, effectively improve the service life of the oil injector and the reliability of other components of the engine, and improve the working reliability of the engine.

[0005] A method for reducing the temperature of an oil head of an oil injector, comprising:

[0006] In response to an engine braking request, controlling the engine to be in a braking mode;

[0007] When it is detected that the number of continuous engine operations exceeds a preset number of revolutions, controlling the engine cylinders in the braking state to be switched to a reverse drag state, and sequentially controlling each oil injector corresponding to the engine cylinders switched to the reverse drag state to inject a preset amount of oil to reduce the temperature of the oil head of the oil injector, wherein the preset number of revolutions is the number of continuous engine operations corresponding to the temperature limit of the oil head of the oil injector;

[0008] When the temperature reduction of all oil heads of the oil injectors is completed, controlling the engine to return to the braking mode.

[0009] Optionally, the step of controlling the engine to be in the braking mode in response to the engine braking request comprises:

[0010] When the engine braking request is received, determining whether the braking level identifier carried in the engine braking request is a first-level braking mode identifier or a second-level braking mode identifier;

[0011] If it is the first-level braking mode flag, controlling the engine to be in the first-level braking mode;

[0012] If it is the secondary braking mode identifier, the engine is controlled to be in the secondary braking mode.

[0013] Optionally, when it is detected that the number of continuous engine operations exceeds a preset number of revolutions, the engine cylinder in the braking state is controlled to switch to a reverse drag state, and the injector corresponding to each engine cylinder switched to the reverse drag state is sequentially controlled to inject a preset injection amount to cool the injector head, including:

[0014] When the engine is in the first-level braking mode, when it is detected that the number of continuous engine operations exceeds the preset number of revolutions, the engine cylinder in the braking state in the first-level braking mode is controlled to switch to the reverse drag state;

[0015] The fuel injector corresponding to each engine cylinder switched to the reverse drag state is controlled in sequence to inject the preset fuel injection amount to cool the fuel injector head.

[0016] Optionally, when it is detected that the number of continuous engine operations exceeds a preset number of revolutions, the engine cylinder in the braking state is controlled to switch to a reverse drag state, and the injector corresponding to each engine cylinder switched to the reverse drag state is sequentially controlled to inject a preset injection amount to cool the injector head, including:

[0017] When the engine is in the secondary braking mode, when it is detected that the engine has been running continuously for more than the preset number of revolutions, a preset number of first engine cylinders are controlled to maintain the braking state, and the remaining second engine cylinders are controlled to enter the reverse drag state;

[0018] sequentially controlling the fuel injector corresponding to each second engine cylinder switched to the reverse dragging state to inject the preset fuel injection amount to cool the fuel injector head, and after the cooling of all the fuel injector heads is completed, controlling all the second engine cylinders to return from the reverse dragging state to the braking state;

[0019] Controlling the preset number of the first engine cylinders to switch from the braking state to the reverse drag state;

[0020] The fuel injector corresponding to each first engine cylinder switched to the reverse drag state is sequentially controlled to inject the preset fuel injection amount to cool the injector oil head, and after the cooling is completed, each first engine cylinder is controlled to return from the reverse drag state to the braking state.

[0021] Optionally, the sequentially controlling the fuel injector corresponding to each engine cylinder switched to the reverse drag state to inject the preset fuel injection amount for fuel injector head temperature reduction comprises:

[0022] For the fuel injector corresponding to each engine cylinder switched to the reverse drag state, control the fuel injector to continuously inject the preset fuel injection amount for multiple times until the corresponding fuel injector head temperature is reduced to the preset temperature value, and then control the next fuel injector to continuously inject the preset fuel injection amount for multiple times for fuel injector head temperature reduction.

[0023] Optionally, the sequentially controlling the fuel injector corresponding to each engine cylinder switched to the reverse drag state to inject the preset fuel injection amount for fuel injector head temperature reduction comprises:

[0024] Control the fuel injector corresponding to each engine cylinder switched to the reverse drag state to sequentially inject the preset fuel injection amount once, and detect the fuel injector head temperature after each injection is completed;

[0025] When the fuel injector head temperature is not reduced to the preset temperature value, control the fuel injector corresponding to each engine cylinder switched to the reverse drag state to sequentially inject the preset fuel injection amount once again, and repeat the cycle until the fuel injector head temperature of each fuel injector is reduced to the preset temperature value.

[0026] A fuel injector head temperature reduction device comprises:

[0027] A response unit is configured to control the engine to be in a braking mode in response to an engine braking request;

[0028] A temperature reduction unit is configured to control the engine cylinder in a braking state to be switched to a reverse drag state when it is detected that the number of continuous engine operations exceeds a preset number of revolutions, and sequentially control the fuel injector corresponding to each engine cylinder switched to the reverse drag state to inject the preset fuel injection amount for fuel injector head temperature reduction, wherein the preset number of revolutions is the number of continuous engine operations when the fuel injector head temperature is a temperature limit value;

[0029] A mode recovery unit is configured to control the engine to be restored to the braking mode after the temperature reduction of all fuel injectors is completed.

[0030] A computer program product comprises computer readable instructions, which, when executed on an electronic device, cause the electronic device to implement the above-mentioned fuel injector head temperature reduction method.

[0031] An electronic device comprises at least one processor and a memory connected to the processor, wherein:

[0032] The memory is configured to store a computer program;

[0033] The processor is configured to execute the computer program to enable the electronic device to implement the method for reducing the temperature of the oil head of the fuel injector.

[0034] A computer storage medium carrying one or more computer programs, when the one or more computer programs are executed by an electronic device, can enable the electronic device to implement the method for reducing the temperature of the oil head of the fuel injector.

[0035] From the above technical solution, the application discloses a method for reducing the temperature of the oil head of the fuel injector and related devices. In response to an engine braking request, the engine is controlled to be in a braking mode. When it is detected that the number of continuous engine operations exceeds a preset number of revolutions, the engine cylinders in the braking state are switched to a motoring state, and the fuel injectors corresponding to each engine cylinder switched to the motoring state are controlled to spray a preset fuel injection amount to cool the fuel injector oil head. After the cooling of all fuel injector oil heads is completed, the engine is controlled to return to the braking mode. In the present application, when the engine is controlled to be in the braking mode and it is detected that the number of continuous engine operations exceeds the preset number of revolutions, it is determined that the temperature of the fuel injector oil head exceeds a temperature limit. At this time, the engine cylinders in the braking state are switched to the motoring state, and the single-cylinder fuel injectors are controlled to spray a small amount of fuel to cool the fuel injector oil head, thereby effectively improving the service life of the fuel injector and the reliability of other engine parts, and further improving the working reliability of the engine. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the disclosed drawings.

[0037] Figure 1 A flowchart of a method for reducing the temperature of the oil head of the fuel injector disclosed in an embodiment of the present application;

[0038] Figure 2 A flowchart of a method for reducing the temperature of the oil head of the fuel injector disclosed in an embodiment of the present application;

[0039] Figure 3 Another flowchart of a method for reducing the temperature of the oil head of the fuel injector disclosed in an embodiment of the present application;

[0040] Figure 4A structure schematic diagram of a fuel injector oil head temperature reducing device disclosed by the embodiment of the present application is disclosed.

[0041] Figure 5 A structure schematic diagram of an electronic device disclosed by the embodiment of the present application is disclosed. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0043] The embodiment of the present application discloses a fuel injector oil head temperature reducing method and related device, in response to an engine braking request, the engine is controlled to be in a braking mode, when it is detected that the number of continuous engine operation times exceeds a preset number of revolutions, the engine cylinder in the braking state is switched to a motoring state, and the fuel injector of each engine cylinder switched to the motoring state is controlled to spray a preset fuel injection amount to cool the fuel injector oil head. When the cooling of all fuel injector oil heads is completed, the engine is controlled to return to the braking mode. In the present application, when the engine is controlled to be in the braking mode, and it is detected that the number of continuous engine operation times exceeds a preset number of revolutions, it is determined that the temperature of the fuel injector oil head exceeds a temperature limit value. At this time, the engine cylinder in the braking state is switched to the motoring state, and the single-cylinder fuel injector is controlled to spray a small amount of fuel to cool, so as to cool the fuel injector oil head, thereby effectively improving the service life of the fuel injector and the reliability of other engine parts, and further improving the working reliability of the engine.

[0044] Referring to Figure 1 The embodiment of the present application discloses a fuel injector oil head temperature reducing method flow chart, the method comprises:

[0045] Step S101, in response to an engine braking request, the engine is controlled to be in a braking mode.

[0046] In actual application, the driver can determine whether to trigger the engine braking request according to the road condition information, for example, the road condition of the vehicle driving on a long downhill road section, and the road condition of the vehicle driving on a wet and slippery road.

[0047] In the present application, the engine braking request carries a braking level identifier, which is a first braking mode identifier or a second braking mode identifier, so as to determine which level of braking mode the engine is controlled to be in.

[0048] Specifically, when the engine braking request is received, it is judged whether the braking level identifier carried in the engine braking request is a first braking mode identifier or a second braking mode identifier.

[0049] If the first brake mode is identified, control the engine in the first brake mode;

[0050] If the second brake mode is identified, control the engine in the second brake mode.

[0051] The first brake mode refers to that half of the engine cylinders are in the brake state, and the other half of the engine cylinders are in the motoring state, but the injectors of the engine do not spray oil.

[0052] The second brake mode refers to that all the engine cylinders are in the brake state.

[0053] In step S102, when it is detected that the number of continuous engine rotations exceeds the preset number of rotations, the engine cylinders in the brake state are switched to the motoring state, and the injectors corresponding to each engine cylinder switched to the motoring state are sequentially controlled to spray a preset amount of oil to cool the injector oil head.

[0054] The preset number of rotations is the number of continuous engine rotations corresponding to the temperature limit of the injector oil head temperature, and the value of the preset number of rotations is determined according to actual needs, which is not limited in the present application.

[0055] Under normal circumstances, the engine generates power by burning fuel to drive the vehicle forward. However, in some specific situations, such as when the driver suddenly pulls back the accelerator pedal, the vehicle will continue to move forward due to inertia, and the engine will start to be rotated by the vehicle due to the loss of power source. At this time, the engine is switched to the motoring state. When the engine cylinders are switched to the motoring state, the engine operates, but the injectors do not spray oil, so the engine not only does not output power externally, but also needs to consume the power provided by the vehicle. That is, the output power of the engine is negative, which is the mechanical loss of the engine itself.

[0056] In practical applications, the number of commonly used engine cylinders of an automobile includes 3 cylinders, 4 cylinders, 5 cylinders, 6 cylinders, 8 cylinders, 10 cylinders, and 12 cylinders, etc. Each engine cylinder corresponds to an injector.

[0057] The working principle of the injector is to atomize the fuel into fine oil droplets and spray it to a specific position in the combustion chamber through the oil hole of the head (i.e. the oil head).

[0058] In order to avoid the influence of the high temperature of the injector oil head on the working reliability of the engine, the present application pre-calibrates the number of continuous engine rotations corresponding to the temperature limit of the injector oil head temperature through experiments to obtain the preset number of rotations.

[0059] One rotation of the engine refers to one rotation of the engine crankshaft.

[0060] The oil head of the oil injector refers to the oil nozzle of the oil injector, and the temperature limit of the oil head temperature refers to the maximum temperature that the material of the oil nozzle can withstand. If the oil head temperature is always higher than the temperature limit, the oil head itself will be correspondingly deteriorated (such as material deformation, melting, serious carbon deposition, etc.).

[0061] The present application limits the oil injection amount when the oil head of the oil injector is cooled, that is, limits the oil injection amount of each oil injector to be the preset oil injection amount each time, and limits only one oil injector to inject the preset oil injection amount at the same time. The preset oil injection amount is calibrated according to the basis of realizing the cooling of the oil head of the oil injector without affecting the normal operation of the engine, and the specific value is determined according to the actual needs, which is not limited in the present application.

[0062] Step S103, when the cooling of all oil heads of the oil injector is completed, the engine is controlled to return to the brake mode.

[0063] When the cooling of all oil heads of the engine is completed, that is, all oil heads of the oil injector are cooled to the preset temperature value, the engine is controlled to return to the brake mode in response to the engine brake request.

[0064] Specifically, if the engine is controlled to be in the first brake mode in response to the engine brake request, after the cooling of all oil heads of the oil injector is completed, the engine is controlled to return to the first brake mode.

[0065] If the engine is controlled to be in the second brake mode in response to the engine brake request, after the cooling of all oil heads of the oil injector is completed, the engine is controlled to return to the second brake mode.

[0066] It should be noted that when the engine returns to the brake mode, if the engine continuous running number is detected to exceed the preset number of revolutions again, steps S102 and S103 are executed again, and the cooling protection of the oil head of the oil injector is realized through repeated execution.

[0067] In conclusion, the application discloses a method for reducing the temperature of the oil head of an oil injector, in response to an engine braking request, the engine is controlled to be in a braking mode, when it is detected that the number of continuous engine operations exceeds a preset number of revolutions, the engine cylinders in the braking state are controlled to be switched to a motoring state, and the oil injectors corresponding to each engine cylinder switched to the motoring state are controlled to spray a preset amount of oil to reduce the temperature of the oil head of the oil injector, and when the temperature reduction of all the oil heads of the oil injectors is completed, the engine is controlled to return to the braking mode. After the engine is controlled to be in the braking mode, when it is detected that the number of continuous engine operations exceeds the preset number of revolutions, it is determined that the temperature of the oil head of the oil injector exceeds a temperature limit value, at this time, the engine cylinders in the braking state are switched to the motoring state, and the single-cylinder oil injectors are controlled to spray a small amount of oil to cool, so that the temperature of the oil head of the oil injector is reduced, thereby effectively improving the service life of the oil injector and the reliability of other engine parts, and further improving the working reliability of the engine.

[0068] In one embodiment, referring to Figure 2 The method flowchart for controlling the oil injectors corresponding to each engine cylinder switched to the motoring state to spray a preset amount of oil to reduce the temperature of the oil head of the oil injector, that is, step S102, can specifically include the following steps.

[0069] Step S201, when the engine is in a first braking mode, if it is detected that the number of continuous engine operations exceeds a preset number of revolutions, the engine cylinders in the braking state in the first braking mode are controlled to be switched to a motoring state.

[0070] In the first braking mode of the engine, half of the engine cylinders are in the braking state, and the other half of the engine cylinders are in the motoring state. When the engine is in the first braking mode, if it is detected that the number of continuous engine operations exceeds the preset number of revolutions, it is determined that the temperature of the oil head of the oil injector corresponding to the engine cylinder in the braking state exceeds a temperature limit value. In order to avoid the deterioration of the oil injector caused by the excessively high temperature of the oil head of the oil injector, the engine cylinders in the braking state in the first braking mode are controlled to be switched to the motoring state.

[0071] Step S202, the oil injectors corresponding to each engine cylinder switched to the motoring state are controlled to spray a preset amount of oil to reduce the temperature of the oil head of the oil injector.

[0072] It should be noted that although half of the engine cylinders are in the motoring state when the engine is in the first braking mode, the application only controls the oil head of the oil injector of each engine cylinder switched from the braking state to the motoring state to be cooled, and does not control the oil head of the oil injector of the engine cylinder originally in the motoring state to be cooled.

[0073] In conclusion, in the case that the engine is in the first brake mode, when it is detected that the engine continuous running time exceeds the preset number of revolutions, it is determined that the oil head temperature of the fuel injector exceeds the temperature limit, at this time, the engine cylinder in the brake state under the first brake mode is switched to the motoring state, and the fuel injector corresponding to each engine cylinder switched to the motoring state is controlled to spray the preset fuel injection amount to cool the oil head of the fuel injector, effectively improving the service life of the fuel injector and the reliability of other engine parts, and further improving the working reliability of the engine.

[0074] In one embodiment, referring to Figure 3 The embodiment of the application discloses another method flow chart for controlling the fuel injector corresponding to each engine cylinder switched to the motoring state to spray the preset fuel injection amount to cool the oil head of the fuel injector, that is, step S102 can specifically include:

[0075] Step S301, in the case that the engine is in the second brake mode, when it is detected that the engine continuous running time exceeds the preset number of revolutions, a preset number of first engine cylinders are controlled to maintain the brake state, and the remaining second engine cylinders are controlled to enter the motoring state.

[0076] Wherein, the preset number is determined according to actual needs, for example, the preset number is half of the total number of engine cylinders.

[0077] When the engine is in the second brake mode, all engine cylinders are in the brake state. When it is detected that the engine continuous running time exceeds the preset number of revolutions, it is determined that the oil head of the fuel injector corresponding to the engine cylinder in the brake state exceeds the temperature limit. In order to avoid the deterioration of the fuel injector caused by the high temperature of the oil head of the fuel injector, and at the same time ensure the working state of the engine, the application controls the preset number of first engine cylinders to maintain the brake state unchanged, and only controls the remaining second engine to enter the motoring state, at this time, the brake mode of the engine is similar to the first brake mode.

[0078] Wherein, the "first" in the first engine cylinder and the "second" in the second engine cylinder are only used to distinguish the engine cylinders in the brake state and the engine cylinders in the motoring state, and do not represent any actual relationship or order between the first engine cylinder and the second engine cylinder.

[0079] Step S302, sequentially control the fuel injector corresponding to each second engine cylinder switched to the motoring state to spray the preset fuel injection amount to cool the oil head of the fuel injector, and control all the second engine cylinders to recover from the motoring state to the brake state after all the fuel injector oil head cooling is completed.

[0080] The application first controls the fuel injector corresponding to each second engine cylinder in the motoring state to perform the temperature reduction operation, that is, controls the fuel injector corresponding to each second engine cylinder to inject the preset fuel injection amount to realize the temperature reduction of the fuel injector head, and when the temperature reduction of the fuel injector head of all the second engine cylinders is completed, controls all the second engine cylinders to recover from the motoring state to the braking state.

[0081] Step S303: controls the preset number of first engine cylinders to switch from the braking state to the motoring state.

[0082] When the fuel injector corresponding to each second engine cylinder performs the temperature reduction operation of the fuel injector head, the fuel injector corresponding to the preset number of first engine cylinders is controlled to perform the temperature reduction operation of the fuel injector head. Before the temperature reduction operation of the fuel injector head is performed, the preset number of first engine cylinders are first controlled to switch from the braking state to the motoring state.

[0083] Step S304: controls the fuel injector corresponding to each first engine cylinder switched to the motoring state to inject the preset fuel injection amount to perform the temperature reduction operation of the fuel injector head, and controls each first engine cylinder to recover from the motoring state to the braking state after the temperature reduction is completed.

[0084] When the preset number of first engine cylinders are switched from the braking state to the motoring state, the fuel injector corresponding to each first engine cylinder switched to the motoring state is controlled to perform the temperature reduction operation, that is, the fuel injector corresponding to each first engine cylinder is controlled to inject the preset fuel injection amount to realize the temperature reduction of the fuel injector head, and when the temperature reduction of the fuel injector head of all the first engine cylinders is completed, all the first engine cylinders are controlled to recover from the motoring state to the braking state.

[0085] In summary, in the case that the engine is in the second brake mode, when it is detected that the number of continuous engine running exceeds the preset number of revolutions, it is determined that the oil head temperature of the fuel injector exceeds the temperature limit value. At this time, a preset number of first engine cylinders are controlled to maintain the brake state, and the remaining second engine cylinders are controlled to enter the reverse drag state. First, the fuel injector corresponding to each second engine cylinder switched to the reverse drag state is controlled to inject a preset fuel injection amount to cool the fuel injector head, and after all the fuel injector head cooling is completed, all the second engine cylinders are controlled to recover from the reverse drag state to the brake state. Then, the preset number of first engine cylinders are controlled to switch from the brake state to the reverse drag state, and the fuel injector corresponding to each first engine cylinder switched to the reverse drag state is controlled to inject a preset fuel injection amount to cool the fuel injector head, and after the cooling is completed, each first engine cylinder is controlled to recover from the reverse drag state to the brake state. The engine cylinder in the brake state is switched to the reverse drag state, and a small amount of fuel is injected to cool the fuel injector, thereby cooling the fuel injector head, thereby effectively improving the service life of the fuel injector and the reliability of other engine parts, and further improving the working reliability of the engine.

[0086] In one embodiment, the process of sequentially controlling the fuel injector corresponding to each engine cylinder switched to the reverse drag state to inject a preset fuel injection amount to cool the fuel injector head can specifically include:

[0087] For the fuel injector corresponding to each engine cylinder switched to the reverse drag state, the fuel injector is controlled to continuously inject the preset fuel injection amount multiple times until the corresponding fuel injector head is cooled to a preset temperature value, and then the next fuel injector is controlled to continuously inject the preset fuel injection amount multiple times to cool the fuel injector head.

[0088] In actual application, when controlling the fuel injector corresponding to each engine cylinder switched to the reverse drag state to inject and cool, starting from the first fuel injector, each fuel injector can be sequentially controlled to continuously inject the preset fuel injection amount multiple times, and the fuel injector head temperature is detected after each fuel injection of the fuel injector, until the fuel injector head is cooled to the preset temperature value. Then, the next fuel injector is controlled to continuously inject the preset fuel injection amount multiple times, and the fuel injector head temperature is detected after each fuel injection of the fuel injector, until the fuel injector head is cooled to the preset temperature value. This cycle is repeated until the fuel injector head of all fuel injectors is cooled to the preset temperature value. The value of the preset temperature value is determined according to actual needs, which is not limited herein.

[0089] The value of the preset fuel injection amount is calibrated according to the fact that it does not affect the normal operation of the engine while achieving fuel injector head cooling, and the specific value is determined according to actual needs, which is not limited herein.

[0090] The oil head of each fuel injector is cooled in the application. During the fuel injection of a single fuel injector, other engine cylinders are subjected to cylinder braking and motoring. Therefore, the engine braking power caused by the fuel injection of a single fuel injector will not be greatly reduced.

[0091] In an embodiment, the process of sequentially controlling the fuel injectors corresponding to each engine cylinder switched to the motoring state to inject a preset fuel injection amount for oil head cooling of the fuel injectors can specifically include:

[0092] The fuel injectors corresponding to each engine cylinder switched to the motoring state are sequentially controlled to inject a preset fuel injection amount once, and the temperature of the oil head of the fuel injector is detected after each injection.

[0093] When the temperature of the oil head of the fuel injector is not reduced to a preset temperature value, the fuel injectors corresponding to each engine cylinder switched to the motoring state are again controlled to inject the preset fuel injection amount once. This process is repeated until the temperature of the oil head of each fuel injector is reduced to the preset temperature value.

[0094] In actual application, when the fuel injectors corresponding to each engine cylinder switched to the motoring state are controlled to inject and cool, the fuel injectors corresponding to each engine cylinder switched to the motoring state can be sequentially controlled to inject a preset fuel injection amount once. The temperature of the oil head of the fuel injector is detected after each injection to determine whether to continue fuel injection. If the temperature of the oil head of the fuel injector is not reduced to a preset temperature value, the fuel injectors corresponding to each engine cylinder switched to the motoring state are again controlled to inject a preset fuel injection amount once. This process is repeated until the temperature of the oil head of each fuel injector is reduced to the preset temperature value, and the fuel injection process is ended.

[0095] Corresponding to the method embodiments described above, the application also discloses a device for reducing the temperature of the oil head of a fuel injector.

[0096] Referring to Figure 4 The application discloses a structural diagram of a device for reducing the temperature of the oil head of a fuel injector. The device can include:

[0097] The response unit 401 is used to control the engine to be in a braking mode in response to an engine braking request.

[0098] In actual application, the driver can determine whether to trigger an engine braking request according to road condition information, for example, road conditions of a vehicle driving on a long downhill road section and road conditions of a vehicle driving on a wet and slippery road surface.

[0099] In the application, the engine braking request carries a braking level identifier, which is a first braking mode identifier or a second braking mode identifier, so as to determine which level of braking mode the engine is controlled to be in.

[0100] The temperature reduction unit 402 is configured to control the engine cylinder in the braking state to switch to the motoring state when it is detected that the number of continuous engine rotations exceeds the preset number of rotations, and sequentially control the fuel injector of each engine cylinder switched to the motoring state to spray a preset amount of fuel to reduce the temperature of the fuel injector head.

[0101] The preset number of rotations is the number of continuous engine rotations corresponding to the temperature limit of the fuel injector head temperature, and the value of the preset number of rotations is determined according to actual needs, which is not limited in the present application.

[0102] Under normal circumstances, the engine generates power by burning fuel to drive the vehicle forward. However, in some specific situations, such as when the driver suddenly pulls back the accelerator pedal, the vehicle will continue to move forward due to inertia, and the engine will start to be rotated by the vehicle due to the loss of power source. At this time, the engine is switched to the motoring state. When the engine cylinder is switched to the motoring state, the engine is running, but the fuel injector does not spray fuel, so the engine not only does not output power to the outside, but also needs to consume the power provided by the vehicle. That is, the output power of the engine is negative, which is the mechanical loss of the engine itself.

[0103] In practical applications, the number of commonly used engine cylinders of a vehicle includes 3 cylinders, 4 cylinders, 5 cylinders, 6 cylinders, 8 cylinders, 10 cylinders, and 12 cylinders, etc. Each engine cylinder corresponds to a fuel injector.

[0104] The working principle of the fuel injector is to atomize the fuel into fine oil droplets and spray it through the oil hole of the head (i.e. the oil head) to a specific position in the combustion chamber.

[0105] In order to avoid the influence of the high temperature of the fuel injector head on the working reliability of the engine, the present application pre-calibrates the number of continuous engine rotations corresponding to the temperature limit of the fuel injector head temperature through experiments to obtain the preset number of rotations.

[0106] The engine rotation refers to one rotation of the engine crankshaft.

[0107] The fuel injector head refers to the fuel injector nozzle, and the temperature limit of the fuel injector head temperature refers to the maximum temperature that the nozzle material itself can withstand. If the temperature of the fuel injector head is always higher than the temperature limit, it will cause corresponding deterioration of the fuel injector head itself (such as material deformation, melting, serious carbon deposition, etc.).

[0108] The application limits the oil injection amount when the oil head of the oil injector is cooled, that is, the oil injection amount of each oil injector in each injection is limited to a preset oil injection amount, and only one oil injector injects the preset oil injection amount at the same time. The preset oil injection amount is calibrated based on the premise that the oil head of the oil injector is cooled without affecting the normal operation of the engine, and the specific value is determined according to actual needs, which is not limited in the application.

[0109] The mode recovery unit 403 is configured to control the engine to return to the brake mode when the cooling of all the oil heads of the oil injectors is completed.

[0110] When the cooling of all the oil heads of the oil injectors is completed, that is, all the oil heads of the oil injectors are cooled to a preset temperature value, the engine is controlled to return to the brake mode in which the engine is in when the engine brake request is responded.

[0111] Specifically, when the engine is controlled to be in the first brake mode in response to the engine brake request, the engine is controlled to return to the first brake mode after the cooling of all the oil heads of the oil injectors is completed.

[0112] When the engine is controlled to be in the second brake mode in response to the engine brake request, the engine is controlled to return to the second brake mode after the cooling of all the oil heads of the oil injectors is completed.

[0113] It should be noted that when the engine returns to the brake mode, if the engine continuous running number is detected to exceed the preset number of revolutions again, steps S102 and S103 are executed again, and the cooling of the oil heads of the oil injectors is repeatedly implemented.

[0114] In summary, the application discloses a device for reducing the temperature of the oil head of an oil injector. In response to an engine brake request, the engine is controlled to be in a brake mode. When the engine continuous running number is detected to exceed a preset number of revolutions, the engine cylinder in the brake state is switched to a motoring state, and the oil head of the oil injector corresponding to each engine cylinder switched to the motoring state is cooled by injecting a preset oil injection amount. When the cooling of all the oil heads of the oil injectors is completed, the engine is controlled to return to the brake mode. When the engine is controlled to be in the brake mode and the engine continuous running number is detected to exceed the preset number of revolutions, it is determined that the temperature of the oil head of the oil injector exceeds a temperature limit value. At this time, the engine cylinder in the brake state is switched to the motoring state, and the oil head of the oil injector is cooled by injecting a small amount of oil, so as to effectively improve the service life of the oil injector and the reliability of other parts of the engine, and further improve the working reliability of the engine.

[0115] In one embodiment, the response unit 401 can be specifically used for:

[0116] when receiving the engine braking request, judging whether the braking level identifier carried in the engine braking request is a first braking mode identifier or a second braking mode identifier;

[0117] if the first braking mode identifier, controlling the engine to be in the first braking mode;

[0118] if the second braking mode identifier, controlling the engine to be in the second braking mode.

[0119] In one embodiment, the cooling unit 402 can specifically include:

[0120] a first control sub-unit, configured to, when the engine is in the first braking mode, control the engine cylinder in the braking state to switch to the reverse drag state when detecting that the engine continuous running number exceeds the preset number of revolutions;

[0121] a first cooling sub-unit, configured to control the oil injector corresponding to each engine cylinder switched to the reverse drag state to inject the preset oil injection amount for oil injector head cooling in sequence.

[0122] In one embodiment, the cooling unit 402 can specifically:

[0123] a second control sub-unit, configured to, when the engine is in the second braking mode, control a preset number of first engine cylinders to maintain the braking state and control the remaining second engine cylinders to enter the reverse drag state when detecting that the engine continuous running number exceeds the preset number of revolutions;

[0124] a second cooling sub-unit, configured to control the oil injector corresponding to each second engine cylinder switched to the reverse drag state to inject the preset oil injection amount for oil injector head cooling in sequence, and control all the second engine cylinders to restore from the reverse drag state to the braking state after all the oil injector head cooling is completed;

[0125] a third control sub-unit, configured to control the preset number of the first engine cylinders to switch from the braking state to the reverse drag state;

[0126] a third cooling sub-unit, configured to control the oil injector corresponding to each first engine cylinder switched to the reverse drag state to inject the preset oil injection amount for oil injector head cooling in sequence, and control each of the first engine cylinders to restore from the reverse drag state to the braking state after the cooling is completed.

[0127] In one embodiment, the cooling unit 402 can be specifically used for:

[0128] For each fuel injector corresponding to each engine cylinder switched to the motoring state, the fuel injector is controlled to continuously inject the preset fuel injection amount for multiple times until the oil head of the corresponding fuel injector is cooled to a preset temperature value, and then the next fuel injector is controlled to continuously inject the preset fuel injection amount for multiple times to cool the oil head of the fuel injector.

[0129] In one embodiment, the cooling unit 402 can be specifically used for:

[0130] The fuel injector corresponding to each engine cylinder switched to the motoring state is controlled to sequentially inject the preset fuel injection amount once, and the oil head temperature of the fuel injector is detected after each injection is completed.

[0131] When the oil head temperature of the fuel injector is not reduced to the preset temperature value, the fuel injector corresponding to each engine cylinder switched to the motoring state is controlled to sequentially inject the preset fuel injection amount once again, and the cycle is repeated until the oil temperature of each fuel injector is reduced to the preset temperature value.

[0132] It should be noted that the specific working principles of the components in the device embodiment are described in the corresponding part of the method embodiment, which will not be repeated here.

[0133] The present application also provides an electronic device. Referring to Figure 5 , a structural diagram suitable for implementing the electronic device in the embodiments of the present application is shown. The electronic device in the embodiments of the present application can include but is not limited to fixed terminals such as mobile phones, notebook computers, PDAs (Personal Digital Assistants), PADs (Tablet PCs), desktop computers, etc. Figure 5 The electronic device shown is only an example and should not impose any limitation on the functions and use range of the embodiments of the present application.

[0134] As shown in Figure 5 , the electronic device can include a processing device (such as a central processor, a graphics processor, etc.) 501, which can perform various appropriate actions and processes according to programs stored in a read-only memory (ROM) 502 or loaded from a storage device 508 into a random access memory (RAM) 503. In the state that the electronic device is powered on, the RAM 503 also stores various programs and data required for the operation of the electronic device. The processing device 501, the ROM 502, and the RAM 503 are connected to each other through a bus 504. An input / output (I / O) interface 505 is also connected to the bus 504.

[0135] In general, the following devices can be connected to the I / O interface 505: input devices 506 including, for example, a touch screen, a touch pad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, and the like; output devices 507 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, and the like; storage devices 508 including, for example, a memory card, a hard disk, and the like; and communication devices 509. The communication devices 509 can allow the electronic device to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 5 An electronic device having various devices is shown, but it is understood that all of the shown devices are not required to be implemented or present. More or less devices can alternatively be implemented or present.

[0136] The embodiments of the present application also provide a computer program product comprising computer readable instructions, which, when executed on an electronic device, cause the electronic device to implement any of the methods for reducing the temperature of the oil head of an oil injector provided by the embodiments of the present application.

[0137] The embodiments of the present application also provide a computer readable storage medium carrying one or more computer programs, which, when executed by an electronic device, can cause the electronic device to implement any of the methods for reducing the temperature of the oil head of an oil injector provided by the embodiments of the present application.

[0138] It should be further noted that the above-described device embodiments are only illustrative, and the units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, i.e., they can be located in one place or distributed on multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the embodiments. In addition, the device embodiments provided in the present application, the connection relationship between the modules indicates that there is a communication connection between them, which can be implemented as one or more communication buses or signal lines.

[0139] Those skilled in the art can clearly understand that the application can be implemented by means of software plus necessary universal hardware, and of course can also be implemented by means of dedicated hardware including special-purpose integrated circuits, special-purpose CPUs, special-purpose memories, special-purpose components, etc. Generally, any function completed by a computer program can be easily implemented by corresponding hardware, and the specific hardware structure for implementing the same function can also be various, such as analog circuits, digital circuits, or special-purpose circuits, etc. However, for the present application, software program implementation is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a readable storage medium, such as a floppy disk, a U disk, a mobile hard disk, a ROM, a RAM, a magnetic disk or an optical disk, etc., and includes a plurality of instructions for causing a computer device (which can be a personal computer, a training device, or a network device, etc.) to execute the methods described in the various embodiments of the present application.

[0140] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments can be implemented in the form of a computer program product.

[0141] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another, for example, the computer instructions can be transmitted from one website, computer, training device or data center to another website, computer, training device or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium that can be stored by a computer or a data storage device such as a training device, a data center, etc. integrated with one or more available media. The available media can be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)), etc.

[0142] Finally, it should be noted that the terms "first", "second", and the like, herein do not denote any order, quantity, combination, or importance, but rather are used to distinguish one element from another, and are not intended to denote the presence of any such actual relationship or order. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0143] The various embodiments in the specification are described with progression in this order of description. Embodiments having the same or similar descriptions are referenced by the same reference numerals.

[0144] The above description of disclosed embodiments provides enabling disclosure sufficient for one of ordinary skill in the art to practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of reducing the temperature of an oil head of an oil injector, characterized by, The method comprises the steps of: controlling the engine to be in a braking mode in response to an engine braking request; when it is detected that the number of continuous engine running times exceeds a preset number of revolutions, controlling the engine cylinders in a braking state to be switched to a motoring state, and sequentially controlling the injectors corresponding to each engine cylinder switched to the motoring state to inject a preset injection amount for injector head cooling; when the cooling of all injectors is completed, controlling the engine to return to the braking mode.

2. The method of reducing the temperature of the oil head of an oil injector according to claim 1, characterized in that, The step of controlling the engine to be in a braking mode in response to an engine braking request comprises the steps of: when the engine braking request is received, determining whether the braking level identifier carried in the engine braking request is a first braking mode identifier or a second braking mode identifier; if the first braking mode identifier, controlling the engine to be in a first braking mode; if the second braking mode identifier, controlling the engine to be in a second braking mode.

3. The method of reducing the temperature of the oil head of an oil injector according to claim 1 or 2, characterized in that, The step of controlling the engine cylinders in a braking state to be switched to a motoring state when it is detected that the number of continuous engine running times exceeds a preset number of revolutions, and sequentially controlling the injectors corresponding to each engine cylinder switched to the motoring state to inject a preset injection amount for injector head cooling comprises the steps of: when the engine is in the first braking mode, and it is detected that the number of continuous engine running times exceeds the preset number of revolutions, controlling the engine cylinders in the braking state under the first braking mode to be switched to the motoring state; sequentially controlling the injectors corresponding to each engine cylinder switched to the motoring state to inject the preset injection amount for injector head cooling.

4. The method of reducing the temperature of the head of an oil injector according to claim 1 or 2, characterized in that, The step of controlling the engine cylinders in a braking state to be switched to a motoring state when it is detected that the number of continuous engine running times exceeds a preset number of revolutions, and sequentially controlling the injectors corresponding to each engine cylinder switched to the motoring state to inject a preset injection amount for injector head cooling comprises the steps of: when the engine is in the second braking mode, and it is detected that the number of continuous engine running times exceeds the preset number of revolutions, controlling a preset number of first engine cylinders to maintain the braking state, and controlling the remaining second engine cylinders to enter the motoring state; sequentially controlling the injectors corresponding to each second engine cylinder switched to the motoring state to inject the preset injection amount for injector head cooling, and controlling all the second engine cylinders to return to the braking state from the motoring state after the cooling of all the injectors is completed; controlling the preset number of first engine cylinders to be switched from the braking state to the motoring state; sequentially controlling the injectors corresponding to each first engine cylinder switched to the motoring state to inject the preset injection amount for injector head cooling, and controlling each first engine cylinder to return to the braking state from the motoring state after the cooling is completed.

5. The method of reducing the temperature of the injector tip of claim 1, wherein, The step of sequentially controlling the injectors corresponding to each engine cylinder switched to the motoring state to inject a preset injection amount for injector head cooling comprises the steps of: For each fuel injector corresponding to the engine cylinder switched to the reverse drag state, the fuel injector is controlled to continuously inject the preset fuel injection amount until the oil head of the corresponding fuel injector is cooled to a preset temperature value, and then the next fuel injector is controlled to continuously inject the preset fuel injection amount to cool the oil head of the fuel injector.

6. The method of reducing the temperature of the injector tip of claim 1, wherein, The method for cooling the oil head of the fuel injector by sequentially controlling the fuel injector corresponding to each engine cylinder switched to the reverse drag state to inject the preset fuel injection amount comprises: The fuel injector corresponding to each engine cylinder switched to the reverse drag state is controlled to sequentially inject the preset fuel injection amount once, and the oil head temperature of the fuel injector is detected after each injection is completed; When the oil head temperature of the fuel injector is not reduced to the preset temperature value, the fuel injector corresponding to each engine cylinder switched to the reverse drag state is controlled to sequentially inject the preset fuel injection amount once again, and the cycle is repeated until the oil temperature of each fuel injector is reduced to the preset temperature value.

7. A fuel injector tip temperature reduction device, comprising: Comprise: A response unit for controlling the engine to be in a braking mode in response to an engine braking request; A cooling unit for controlling the engine cylinder in a braking state to be switched to a reverse drag state when it is detected that the number of continuous engine operations exceeds a preset number of revolutions, and sequentially controlling the fuel injector corresponding to each engine cylinder switched to the reverse drag state to inject a preset fuel injection amount to cool the oil head of the fuel injector, wherein the preset number of revolutions is the number of continuous engine operations corresponding to the temperature limit of the oil head temperature of the fuel injector; A mode recovery unit for controlling the engine to return to the braking mode after the cooling of all fuel injectors is completed.

8. A computer program product, characterised in that, The computer readable instructions, when executed on an electronic device, cause the electronic device to implement the method for reducing the temperature of the oil head of the fuel injector as claimed in any one of claims 1 to 6.

9. An electronic device, comprising: The memory is used to store computer programs; The processor is used to execute the computer programs to enable the electronic device to implement the method for reducing the temperature of the oil head of the fuel injector as claimed in any one of claims 1 to 6. The storage medium carries one or more computer programs, which, when executed by an electronic device, enable the electronic device to implement the method for reducing the temperature of the oil head of the fuel injector as claimed in any one of claims 1 to 6.

10. A computer storage medium, characterized in that ​

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