Method for reducing temperature of oil head of oil injector and related device

Abstract

The invention discloses a method for reducing the temperature of an oil head of an oil injector and a related device, which are applied to the technical field of engines and comprise the steps of controlling an engine to be in a braking mode in response to an engine braking request, and controlling an engine cylinder in a braking state to be switched to a reverse towing state when detecting that the number of continuous operation times of the engine exceeds a preset revolution number. And oil sprayers corresponding to all the engine cylinders switched to the reverse towing state are sequentially controlled to spray preset oil spraying amount to cool oil sprayer oil heads, and after cooling of all the oil sprayer oil heads is finished, the engine is controlled to restore to the braking mode. After the engine is controlled to be in the braking mode, when it is detected that the number of continuous operation times of the engine exceeds the preset number of revolutions, it is determined that the temperature of the fuel injector head exceeds the temperature limit value, the engine cylinder in the braking state is switched into the reverse towing state, and the single-cylinder fuel injector is controlled to inject a small amount of fuel to cool the fuel injector head; the service life of the fuel injector and the reliability of other parts of the engine are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and more particularly to a method for reducing the temperature of an injector oil head and a related device. Background Art

[0002] Engine cylinder braking is a way to provide auxiliary braking force through the engine. On the vehicle, the user turns on the auxiliary brake switch to make the engine provide a large negative torque, which will reduce the vehicle speed to achieve the purpose of deceleration and reduce the pressure of the active braking system. At present, the demand for engine cylinder braking in the tractor market is increasing, including increased braking power, increased brake cylinder pressure, and increased braking times. Some vehicles even use engine cylinder braking to replace hydraulic retarders (hydraulic retarders).

[0003] At present, for working conditions such as heavy-load downhill driving in mountainous areas, the engine cylinder brake is frequently activated, and the duration of each brake activation will also increase. As the brake cylinder pressure increases, the cylinder temperature during braking will also increase. At the same time, since the engine injector does not spray oil during braking conditions, the injector head cannot spray oil for cooling and exceeds its own allowable operating temperature, causing the injector to deteriorate, which in turn affects the engine's working reliability, for example, causing the engine piston top to melt. Summary of the invention

[0004] In view of this, the present invention discloses a method for reducing the temperature of an injector head and a related device, so as to reduce the temperature of the injector head, effectively improve the life of the injector and the reliability of other engine components, and improve the working reliability of the engine.

[0005] A method for reducing the temperature of a fuel injector head, 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, the engine cylinder in the braking state is controlled to switch to the reverse drag state, and the injector corresponding to each engine cylinder switched to the reverse drag state is sequentially controlled to spray a preset injection amount to cool the injector oil head, wherein the preset number of revolutions is the number of continuous engine operations corresponding to when the injector oil head temperature is the temperature limit;

[0008] After all the injector heads have been cooled down, the engine is controlled to return to the braking mode.

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

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

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

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

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

[0014] When the engine is in the first-level braking mode, when it is detected that the number of continuous engine operation 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 sequentially controlled to inject the preset fuel injection amount to cool the fuel injector oil head.

[0016] Optionally, when it is detected that the number of continuous engine operation exceeds a preset number of revolutions, the engine cylinder in the braking state is controlled to switch to the reverse drag state, and the injector corresponding to each engine cylinder switched to the reverse drag state is sequentially controlled to spray a preset injection amount to cool the injector oil 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 down the fuel injector head, and after the cooling down 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 injectors corresponding to each first engine cylinder switched to the reverse dragging state are sequentially controlled to spray the preset fuel injection amount to cool down the fuel injector oil head, and after the cooling is completed, each first engine cylinder is controlled to return from the reverse dragging state to the braking state.

[0021] Optionally, the step 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 down the fuel injector head includes:

[0022] For the injector corresponding to each engine cylinder switched to the reverse drag state, the injector is controlled to continuously spray the preset injection amount for multiple times until the corresponding injector oil head is cooled to a preset temperature value, and then the next injector is controlled to continuously spray the preset injection amount for multiple times to cool the injector oil head.

[0023] Optionally, the step 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 down the fuel injector head includes:

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

[0025] When the injector oil head temperature has not dropped to the preset temperature value, the injector corresponding to each engine cylinder that is switched to the reverse drag state is controlled again to spray the preset injection amount once in turn, and this cycle is repeated until the injector oil temperature corresponding to each injector drops to the preset temperature value.

[0026] A device for reducing the temperature of a fuel injector head, comprising:

[0027] a response unit, for controlling the engine to be in a braking mode in response to an engine braking request;

[0028] A cooling unit, for controlling the engine cylinder in the braking state to switch to the reverse drag state when it is detected that the number of continuous engine operation exceeds a preset number of revolutions, and sequentially controlling the fuel injector corresponding to each engine cylinder switched to the reverse drag state to spray a preset injection amount to cool the fuel injector head, wherein the preset number of revolutions is the number of continuous engine operation corresponding to the temperature of the fuel injector head being the temperature limit;

[0029] The mode recovery unit is used to control the engine to recover to the braking mode after cooling down all the injector heads.

[0030] A computer program product includes computer-readable instructions. When the computer-readable instructions are executed on an electronic device, the electronic device implements the above-mentioned method for reducing the temperature of an injector head.

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

[0032] The memory is used to store computer programs;

[0033] The processor is used to execute the computer program so that the electronic device can implement the above-mentioned method for reducing the temperature of the injector head.

[0034] A computer storage medium carries one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement the above-mentioned method for reducing the temperature of an injector head.

[0035] As can be seen from the above technical scheme, the present invention discloses a method for reducing the temperature of the injector head and a related device. In response to the 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 cylinder in the braking state is controlled to switch to a reverse drag state, and the injectors corresponding to each engine cylinder switched to the reverse drag state are sequentially controlled to spray a preset amount of fuel to cool the injector head. When all the injector heads are cooled, 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 a preset number of revolutions, it is determined that the injector head temperature exceeds the temperature limit. At this time, the engine cylinder in the braking state is switched to a reverse drag state, and a single-cylinder injector is controlled to spray a small amount of fuel for cooling, so as to achieve the cooling of the injector head, thereby effectively improving the life of the injector and the reliability of other engine components, thereby improving the working reliability of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the disclosed drawings without paying creative work.

[0037] Figure 1 A flow chart of a method for reducing the temperature of a fuel injector head disclosed in an embodiment of the present invention;

[0038] Figure 2 A flow chart of a method disclosed in an embodiment of the present invention for controlling the injector corresponding to each engine cylinder switched to a reverse drag state to inject a preset injection amount to cool the injector head;

[0039] Figure 3 A flow chart of another method disclosed in an embodiment of the present invention for controlling the injector corresponding to each engine cylinder switched to a reverse drag state to inject a preset injection amount to cool the injector head;

[0040] Figure 4It is a structural schematic diagram of a device for reducing the temperature of a fuel injector head disclosed in an embodiment of the present invention;

[0041] Figure 5 The present invention is a schematic diagram of the structure of an electronic device disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] The embodiment of the present invention discloses a method for reducing the temperature of an injector head and a 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 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 injectors corresponding to each engine cylinder switched to the reverse drag state are sequentially controlled to spray a preset amount of fuel to cool the injector head. After all the injector heads have been cooled, 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 a preset number of revolutions, it is determined that the injector head temperature exceeds the temperature limit. At this time, the engine cylinder in the braking state is switched to a reverse drag state, and a single-cylinder injector is controlled to spray a small amount of fuel for cooling, so as to achieve injector head cooling, thereby effectively improving the life of the injector and the reliability of other engine components, thereby improving the working reliability of the engine.

[0044] See also Figure 1 , a flow chart of a method for reducing the temperature of a fuel injector head disclosed in an embodiment of the present application, the method comprising:

[0045] Step S101: In response to an engine braking request, control the engine to be in a braking mode.

[0046] In actual applications, the driver may determine whether to trigger the engine braking request based on road condition information, such as the road condition when the vehicle is traveling on a long downhill section or the road condition when the vehicle is traveling on a slippery road.

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

[0048] Specifically, when an engine braking request is received, it is determined that the braking level identifier carried in the engine braking request is a first-level braking mode identifier or a second-level braking mode identifier;

[0049] If it is the first-level braking mode mark, controlling the engine to be in the first-level braking mode;

[0050] If it is the secondary braking mode mark, the engine is controlled to be in the secondary braking mode.

[0051] Among them, the first-level braking mode means: half of the engine cylinders are in braking state, and the other half of the cylinders are in reverse drag state, but the engine's injectors do not spray fuel.

[0052] The secondary braking mode means that all cylinders of the engine are in braking state.

[0053] Step S102: when it is detected that the number of continuous engine operation exceeds a preset number of revolutions, the engine cylinder in the braking state is controlled to switch to the reverse drag state, and the injector corresponding to each engine cylinder switched to the reverse drag state is controlled in turn to spray a preset injection amount to cool the injector oil head.

[0054] Among them, the preset number of revolutions is the number of continuous engine operations corresponding to when the injector oil head temperature is the temperature limit. The value of the preset number of revolutions is determined according to actual needs and is not limited in this application.

[0055] Under normal circumstances, the engine generates power by burning fuel to drive the vehicle forward. However, in certain specific situations, such as when the driver suddenly retracts the accelerator pedal, the vehicle will continue to move forward due to inertia, and the engine will start to be dragged and rotated by the vehicle due to the loss of power source. At this time, the engine switches to the reverse drag state. When the engine cylinder switches to the reverse drag state, the engine runs, but the injector does not spray fuel. Therefore, the engine not only does not output power to the outside, but also consumes the power provided by the vehicle, that is, the output power of the engine is negative, and this negative value is the mechanical loss of the engine itself.

[0056] In actual applications, the commonly used numbers of cylinders in automobile engines include: 3 cylinders, 4 cylinders, 5 cylinders, 6 cylinders, 8 cylinders, 10 cylinders and 12 cylinders, etc., and each engine cylinder corresponds to an injector.

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

[0058] In order to avoid affecting the working reliability of the engine due to the excessive temperature of the injector head, the present application pre-calibrates the number of continuous engine operations corresponding to the temperature limit of the injector head through experiments to obtain the preset number of revolutions.

[0059] Among them, one engine revolution means that the engine crankshaft rotates one circle.

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

[0061] In order to avoid the excessive amount of oil injected by the injector affecting the normal operation of the engine, the application limits the amount of oil injected when the injector head is cooled, that is, the amount of oil injected by each injector each time is limited to the preset amount of oil injected, and only one injector is limited to inject the preset amount of oil injected at the same time. The value of the preset amount of oil injected is calibrated based on the fact that the normal operation of the engine is not affected while the temperature of the injector head is cooled. The specific value is determined according to actual needs and is not limited by the application.

[0062] Step S103: After cooling down of all the injector heads, the engine is controlled to return to the braking mode.

[0063] When all the injector heads of the engine have finished cooling down, that is, when all the injector heads have cooled down to a preset temperature value, the engine is controlled to resume the braking mode in which it was in when responding to the engine braking request.

[0064] Specifically, if the engine is controlled to be in the first-level braking mode in response to the engine braking request, after all the injector heads are cooled down, the engine is controlled to return to the first-level braking mode.

[0065] If the engine is controlled to be in the secondary braking mode in response to the engine braking request, the engine is controlled to return to the secondary braking mode after all the injector heads have been cooled down.

[0066] It should be noted that, after the engine returns to the braking mode, if it is detected again that the engine has continued to run for more than the preset number of revolutions, step S102 and step S103 are executed again, and this process is repeated to achieve temperature reduction protection for the injector head.

[0067] In summary, the present application discloses a method for reducing the temperature of the injector head. In response to the engine braking request, the engine is controlled to be in a braking mode. When it is detected that the number of continuous engine operation exceeds a preset number of revolutions, the engine cylinder in the braking state is controlled to switch to a reverse drag state, and the injectors corresponding to each engine cylinder switched to the reverse drag state are sequentially controlled to spray a preset amount of fuel to cool the injector head. When all the injector heads are cooled, 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 operation exceeds a preset number of revolutions, it is determined that the injector head temperature exceeds the temperature limit. At this time, the engine cylinder in the braking state is switched to a reverse drag state, and a single-cylinder injector is controlled to spray a small amount of fuel for cooling, so as to achieve the cooling of the injector head, thereby effectively improving the life of the injector and the reliability of other engine components, thereby improving the working reliability of the engine.

[0068] In one embodiment, see Figure 2 , a flow chart of a method for controlling the injector corresponding to each engine cylinder switched to a reverse drag state to inject a preset injection amount to cool the injector head is disclosed in an embodiment of the present application, that is, step S102 may specifically include:

[0069] Step S201: When the engine is in the first-level 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 in the first-level braking mode are controlled to switch to the reverse drag state.

[0070] Among them, when the engine is in the first-level braking mode, half of the cylinders of the engine are in the braking state, and the remaining half of the cylinders are in the reverse drag state. When the engine is in the first-level braking mode, if it is detected that the engine has been running continuously for more than the preset number of revolutions, it is determined that the injector head corresponding to the engine cylinder in the braking state exceeds the temperature limit. In order to avoid injector degradation due to excessively high injector head temperature, the application controls the engine cylinder in the braking state in the first-level braking mode to switch to the reverse drag state.

[0071] Step S202: sequentially control the fuel injectors corresponding to each engine cylinder switched to the reverse drag state to inject a preset fuel injection amount to cool down the fuel injector head.

[0072] It should be noted that, although half of the cylinders are in the reverse drag state when the engine is in the first-level braking mode, the present application only performs injector oil head cooling for each engine cylinder that switches from the braking state to the reverse drag state, and does not perform injector oil head cooling for the engine cylinder that was initially in the reverse drag state.

[0073] In summary, in the present application, when the engine is in the first-level braking mode, when it is detected that the number of continuous engine operations exceeds a preset number of revolutions, it is determined that the temperature of the injector head exceeds the temperature limit. At this time, the engine cylinder in the braking state in the first-level braking mode is controlled to switch to the reverse drag state, and the injector corresponding to each engine cylinder switched to the reverse drag state is controlled in turn to spray a preset injection amount to cool the injector head, thereby effectively improving the life of the injector and the reliability of other engine components, thereby improving the working reliability of the engine.

[0074] In one embodiment, see Figure 3 , another method flow chart of controlling the injector corresponding to each engine cylinder switched to the reverse drag state to inject a preset injection amount to cool the injector head is disclosed in an embodiment of the present application, that is, step S102 may specifically include:

[0075] Step S301: When the engine is in the secondary braking mode, when it is detected that the engine has been running continuously for more than a preset number of revolutions, a preset number of first engine cylinders are controlled to maintain a braking state, and the remaining second engine cylinders are controlled to enter a reverse drag state.

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

[0077] When the engine is in the secondary braking mode, all cylinders of the engine are in a braking state. When it is detected that the number of continuous engine operations exceeds the preset number of revolutions, it is determined that the injector head corresponding to the engine cylinder in the braking state exceeds the temperature limit. In order to avoid injector degradation due to excessive injector head temperature and ensure the working state of the engine, the present application controls a preset number of first engine cylinders to maintain the braking state unchanged, and only controls the remaining second engine to enter the reverse drag state. At this time, the braking mode of the engine is similar to the primary braking mode.

[0078] Among them, the "first" in the first engine cylinder and the "second" in the second engine cylinder are only used to distinguish the engine cylinder in the braking state from the engine cylinder in the reverse dragging state, and do not indicate any actual relationship or order between the first engine cylinder and the second engine cylinder.

[0079] Step S302, 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 down the fuel injector oil head, and after the cooling of all the fuel injector oil heads is completed, controlling all the second engine cylinders to return from the reverse dragging state to the braking state.

[0080] The present application first controls the fuel injector corresponding to each second engine cylinder in the reverse towing state to perform a cooling operation, that is, controls the fuel injector corresponding to each second engine cylinder in turn to spray a preset injection amount to achieve cooling of the injector head. When the fuel injector heads corresponding to all the second engine cylinders have been cooled down, all the second engine cylinders are controlled to return from the reverse towing state to the braking state.

[0081] Step S303: Control the preset number of the first engine cylinders to switch from the braking state to the reverse drag state.

[0082] After all the injectors corresponding to the second engine cylinders have completed the injector head cooling operation, the injector head cooling operation is performed on the injectors corresponding to the preset number of first engine cylinders. Before performing the injector head cooling operation, the preset number of first engine cylinders are first controlled to switch from the braking state to the reverse drag state.

[0083] Step S304, sequentially controlling the fuel injector corresponding to each first engine cylinder switched to the reverse drag state to inject the preset fuel injection amount to cool the injector oil head, and after the cooling is completed, controlling each first engine cylinder to return from the reverse drag state to the braking state.

[0084] When a preset number of first engine cylinders are switched from the braking state to the reverse towing state, the fuel injectors corresponding to each first engine cylinder switched to the reverse towing state are controlled in turn to perform a cooling operation, that is, the fuel injectors corresponding to each first engine cylinder are controlled in turn to spray a preset injection amount to cool the injector head; when the fuel injector heads corresponding to all the first engine cylinders have been cooled, all the first engine cylinders are controlled to return from the reverse towing state to the braking state.

[0085] In summary, when the engine is in the secondary braking mode, the present application determines that the temperature of the injector head exceeds the temperature limit when it is detected that the number of continuous engine operation times exceeds the preset number of revolutions. At this time, the 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. First, the injectors corresponding to each second engine cylinder switched to the reverse drag state are controlled to spray the preset injection amount to cool the injector head, and after all the injector heads have been cooled, all the second engine cylinders are controlled to return from the reverse drag state to the braking state, and then the preset number of first engine cylinders are controlled to switch from the braking state to the reverse drag state, and the injectors corresponding to each first engine cylinder switched to the reverse drag state are controlled to spray the preset injection amount to cool the injector head, and after the cooling is completed, each first engine cylinder is controlled to return from the reverse drag state to the braking state. The present application switches the engine cylinder in the braking state to the reverse drag state, and controls the single-cylinder injector to spray a small amount of oil for cooling, so as to achieve the cooling of the injector head, thereby effectively improving the life of the injector and the reliability of other engine components, thereby 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 may specifically include:

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

[0088] In practical applications, when the injector corresponding to each engine cylinder switched to the reverse drag state is controlled to spray and cool down, starting from the first injector, each injector can be controlled in sequence to spray a preset amount of fuel for multiple times, and the temperature of the injector head is detected after each injection of the injector until the injector head cools down to the preset temperature value, and then the next injector is controlled to spray the preset amount of fuel for multiple times, and the temperature of the injector head is detected after each injection of the injector until the injector head cools down to the preset temperature value, and so on, until the injector heads of all injectors cool down to the preset temperature value. The value of the preset temperature value is determined according to actual needs, and this application does not limit it here.

[0089] Among them, the value of the preset injection amount is calibrated based on achieving the cooling of the injector head without affecting the normal operation of the engine. The specific value is determined according to actual needs and this application does not limit it here.

[0090] In the present application, each injector is injected with a small amount of fuel one by one to cool the injector head. During the injection of a single injector, other engine cylinders are performing in-cylinder braking and reverse drag. Therefore, the reduction in engine braking power caused by injection of a single injector will not be very large.

[0091] 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 may specifically include:

[0092] Control the fuel injector corresponding to each engine cylinder switched to the reverse drag state to inject a preset fuel injection amount in sequence, and detect the fuel head temperature of the fuel injector after each injection is completed;

[0093] When the injector oil head temperature has not dropped to the preset temperature value, the injector corresponding to each engine cylinder that is switched to the reverse drag state is controlled again to spray the preset injection amount once in turn, and this is repeated until the injector oil temperature corresponding to each injector drops to the preset temperature value.

[0094] In actual applications, when controlling the fuel injectors corresponding to each engine cylinder that has switched to the reverse drag state to spray fuel and cool down, the fuel injectors corresponding to each engine cylinder that has switched to the reverse drag state can be controlled to spray a preset fuel amount in sequence one by one, and the injector head temperature is detected after each injector completes the injection to decide whether to continue spraying fuel. If the injector head temperature has not dropped to the preset temperature value, the fuel injectors corresponding to each engine cylinder that has switched to the reverse drag state are controlled again to spray a preset fuel amount in sequence one by one, and this cycle is repeated until the injector oil temperature corresponding to each injector drops to the preset temperature value, thereby terminating the fuel injection process.

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

[0096] See also Figure 4 The present application discloses a schematic structural diagram of a device for reducing the temperature of a fuel injector head, which may 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 applications, the driver may determine whether to trigger the engine braking request based on road condition information, such as the road condition when the vehicle is traveling on a long downhill section or the road condition when the vehicle is traveling on a slippery road.

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

[0100] The cooling unit 402 is used to control the engine cylinder in the braking state to switch to the reverse drag state when it is detected that the number of continuous operation of the engine exceeds a preset number of revolutions, and sequentially control the injector corresponding to each engine cylinder switched to the reverse drag state to inject a preset injection amount to cool the injector oil head.

[0101] Among them, the preset number of revolutions is the number of continuous engine operations corresponding to when the injector oil head temperature is the temperature limit. The value of the preset number of revolutions is determined according to actual needs and is not limited in this application.

[0102] Under normal circumstances, the engine generates power by burning fuel to drive the vehicle forward. However, in certain specific situations, such as when the driver suddenly retracts the accelerator pedal, the vehicle will continue to move forward due to inertia, and the engine will start to be dragged and rotated by the vehicle due to the loss of power source. At this time, the engine switches to the reverse drag state. When the engine cylinder switches to the reverse drag state, the engine runs, but the injector does not spray fuel. Therefore, the engine not only does not output power to the outside, but also consumes the power provided by the vehicle, that is, the output power of the engine is negative, and this negative value is the mechanical loss of the engine itself.

[0103] In actual applications, the commonly used numbers of cylinders in automobile engines include: 3 cylinders, 4 cylinders, 5 cylinders, 6 cylinders, 8 cylinders, 10 cylinders and 12 cylinders, etc., and each engine cylinder corresponds to an injector.

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

[0105] In order to avoid affecting the working reliability of the engine due to the excessive temperature of the injector head, the present application pre-calibrates the number of continuous engine operations corresponding to the temperature limit of the injector head through experiments to obtain the preset number of revolutions.

[0106] Among them, one engine revolution means that the engine crankshaft rotates one circle.

[0107] The injector head refers to the injector nozzle of the injector. The temperature limit of the injector head temperature refers to the maximum temperature that the injector nozzle material itself can withstand. If the injector head temperature is always higher than the temperature limit, the injector head itself will be deteriorated accordingly (such as material deformation, melting, severe carbon deposition, etc.).

[0108] In order to avoid the excessive amount of oil injected by the injector affecting the normal operation of the engine, the application limits the amount of oil injected when the injector head is cooled, that is, the amount of oil injected by each injector each time is limited to the preset amount of oil injected, and only one injector is limited to inject the preset amount of oil injected at the same time. The value of the preset amount of oil injected is calibrated based on the fact that the normal operation of the engine is not affected while the temperature of the injector head is cooled. The specific value is determined according to actual needs and is not limited by the application.

[0109] The mode recovery unit 403 is used to control the engine to recover to the braking mode after cooling down of all the injector heads.

[0110] When all the injector heads of the engine have finished cooling down, that is, when all the injector heads have cooled down to a preset temperature value, the engine is controlled to resume the braking mode in which it was in when responding to the engine braking request.

[0111] Specifically, if the engine is controlled to be in the first-level braking mode in response to the engine braking request, after all the injector heads are cooled down, the engine is controlled to return to the first-level braking mode.

[0112] If the engine is controlled to be in the secondary braking mode in response to the engine braking request, the engine is controlled to return to the secondary braking mode after all the injector heads have been cooled down.

[0113] It should be noted that, after the engine returns to the braking mode, if it is detected again that the engine has continued to run for more than the preset number of revolutions, step S102 and step S103 are executed again, and this process is repeated to achieve temperature reduction protection for the injector head.

[0114] In summary, the present application discloses a device for reducing the temperature of the injector head. In response to the engine braking request, the engine is controlled to be in a braking mode. When it is detected that the number of continuous engine operation exceeds a preset number of revolutions, the engine cylinder in the braking state is controlled to switch to a reverse drag state, and the injectors corresponding to each engine cylinder switched to the reverse drag state are sequentially controlled to spray a preset amount of fuel to cool the injector head. When all the injector heads are cooled, the engine is controlled to return to the braking mode. After the present application controls the engine to be in the braking mode, when it is detected that the number of continuous engine operation exceeds a preset number of revolutions, it is determined that the injector head temperature exceeds the temperature limit. At this time, the engine cylinder in the braking state is switched to a reverse drag state, and a single-cylinder injector is controlled to spray a small amount of fuel for cooling, so as to achieve the cooling of the injector head, thereby effectively improving the life of the injector and the reliability of other engine components, thereby improving the working reliability of the engine.

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

[0116] When the engine braking request is received, determining whether the braking level identifier carried in the engine braking request is a primary braking mode identifier or a secondary braking mode identifier;

[0117] If it is the first-level braking mode mark, controlling the engine to be in the first-level braking mode;

[0118] If it is the secondary braking mode mark, the engine is controlled to be in the secondary braking mode.

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

[0120] A first control subunit is used for controlling the engine cylinder in the braking state in the first braking mode to switch to the reverse drag state when it is detected that the engine has been running continuously for more than the preset number of revolutions when the engine is in the first braking mode;

[0121] The first cooling subunit is used to sequentially control the fuel injector corresponding to each engine cylinder switched to the reverse drag state to inject the preset fuel injection amount to cool the fuel injector oil head.

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

[0123] a second control subunit, configured to, when the engine is in the secondary 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 it is detected that the engine has been running continuously for more than the preset number of revolutions;

[0124] A second cooling subunit is used to sequentially control the fuel injector corresponding to each second engine cylinder switched to the reverse drag state to inject the preset fuel injection amount to cool the fuel injector oil head, and after the cooling of all the fuel injector oil heads is completed, control all the second engine cylinders to return from the reverse drag state to the braking state;

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

[0126] The third cooling sub-unit is used to sequentially control the injectors corresponding to each first engine cylinder switched to the reverse drag state to inject the preset injection amount to cool the injector oil head, and control each first engine cylinder to return 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 the injector corresponding to each engine cylinder switched to the reverse drag state, the injector is controlled to continuously spray the preset injection amount for multiple times until the corresponding injector oil head is cooled to a preset temperature value, and then the next injector is controlled to continuously spray the preset injection amount for multiple times to cool the injector oil head.

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

[0130] Controlling the fuel injector corresponding to each engine cylinder switched to the reverse drag state to sequentially inject the preset fuel injection amount once, and detecting the fuel head temperature of the fuel injector after each injection is completed;

[0131] When the injector oil head temperature has not dropped to the preset temperature value, the injector corresponding to each engine cylinder that is switched to the reverse drag state is controlled again to spray the preset injection amount once in turn, and this cycle is repeated until the injector oil temperature corresponding to each injector drops to the preset temperature value.

[0132] It should be noted that, for the specific working principles of each component in the device embodiment, please refer to the corresponding part of the method embodiment, which will not be repeated here.

[0133] The present application also provides an electronic device in an embodiment. Figure 5 As shown, it shows a schematic diagram of the structure of an electronic device suitable for implementing the embodiment of the present application. The electronic device in the embodiment of the present application may include but is not limited to fixed terminals such as mobile phones, laptops, PDAs (personal digital assistants), PADs (tablet computers), desktop computers, etc. Figure 5 The electronic device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

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

[0135] Typically, the following devices may be connected to the I / O interface 505: an input device 506 including, for example, a touch screen, a touch pad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; an output device 507 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 508 including, for example, a memory card, a hard disk, etc.; and a communication device 509. The communication device 509 may allow the electronic device to communicate with other devices wirelessly or by wire to exchange data. Although Figure 5 An electronic device having various devices is shown, but it should be understood that it is not required to implement or possess all the devices shown. More or fewer devices may be implemented or possessed instead.

[0136] An embodiment of the present application also provides a computer program product including computer-readable instructions. When the computer-readable instructions are executed on an electronic device, the electronic device implements any method for reducing the temperature of an injector head provided in the embodiment of the present application.

[0137] A computer-readable storage medium is also provided in an embodiment of the present application. The storage medium carries one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement any method for reducing the temperature of the injector head provided in the embodiment of the present application.

[0138] It should also be noted that the device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed over multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the drawings of the device embodiments provided by the present application, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines.

[0139] Through the description of the above implementation mode, the technicians in the field can clearly understand that the present application can be implemented by means of software plus necessary general hardware, and of course, it can also be implemented by special hardware including special integrated circuits, special CPUs, special memories, special components, etc. In general, all functions completed by computer programs can be easily implemented by corresponding hardware, and the specific hardware structure used to implement the same function can also be various, such as analog circuits, digital circuits or special circuits. However, for the present application, software program implementation is a better implementation mode in more cases. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a readable storage medium, such as a computer floppy disk, a U disk, a mobile hard disk, a ROM, a RAM, a disk or an optical disk, etc., including a number of instructions to enable a computer device (which can be a personal computer, a training device, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0140] In the above embodiments, all or part of the embodiments may be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments may 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, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website site, a computer, a training device, or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, training device, or data center. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a training device, a data center, etc. that includes one or more available media integrations. The available medium may be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)), etc.

[0142] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0143] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0144] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for reducing the temperature of a fuel injector head, characterized in that: include: In response to an engine braking request, controlling the engine 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 cylinder in the braking state is controlled to switch to the reverse drag state, and the injector corresponding to each engine cylinder switched to the reverse drag state is sequentially controlled to spray a preset injection amount to cool the injector oil head, wherein the preset number of revolutions is the number of continuous engine operations corresponding to when the injector oil head temperature is the temperature limit; After all the injector heads have been cooled down, the engine is controlled to return to the braking mode.

2. The method for reducing the temperature of the fuel injector head according to claim 1, characterized in that: In response to the engine braking request, controlling the engine to be in a braking mode comprises: When the engine braking request is received, determining whether the braking level identifier carried in the engine braking request is a primary braking mode identifier or a secondary braking mode identifier; If it is the first-level braking mode mark, controlling the engine to be in the first-level braking mode; If it is the secondary braking mode mark, the engine is controlled to be in the secondary braking mode.

3. The method for reducing the temperature of the fuel injector head according to claim 1 or 2, characterized in that: When it is detected that the engine has been running continuously for more than a preset number of revolutions, the engine cylinder in the braking state is controlled to switch to the reverse drag state, and the injector corresponding to each engine cylinder switched to the reverse drag state is sequentially controlled to spray a preset injection amount to cool the injector oil head, including: When the engine is in the first-level braking mode, when it is detected that the number of continuous engine operation 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; The fuel injector corresponding to each engine cylinder switched to the reverse drag state is sequentially controlled to inject the preset fuel injection amount to cool the fuel injector oil head.

4. The method for reducing the temperature of the fuel injector head according to claim 1 or 2, characterized in that: When it is detected that the engine has been running continuously for more than a preset number of revolutions, the engine cylinder in the braking state is controlled to switch to the reverse drag state, and the injector corresponding to each engine cylinder switched to the reverse drag state is sequentially controlled to spray a preset injection amount to cool the injector oil head, including: 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; 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 down the fuel injector head, and after the cooling down 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; Controlling the preset number of the first engine cylinders to switch from the braking state to the reverse drag state; The fuel injectors corresponding to each first engine cylinder switched to the reverse dragging state are sequentially controlled to spray the preset fuel injection amount to cool down the fuel injector oil head, and after the cooling is completed, each first engine cylinder is controlled to return from the reverse dragging state to the braking state.

5. The method for reducing the temperature of the fuel injector head according to claim 1, characterized in that: The method 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 includes: For the injector corresponding to each engine cylinder switched to the reverse drag state, the injector is controlled to continuously spray the preset injection amount for multiple times until the corresponding injector oil head is cooled to a preset temperature value, and then the next injector is controlled to continuously spray the preset injection amount for multiple times to cool the injector oil head.

6. The method for reducing the temperature of the fuel injector head according to claim 1, characterized in that: The method 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 includes: Controlling the fuel injector corresponding to each engine cylinder switched to the reverse drag state to sequentially inject the preset fuel injection amount once, and detecting the fuel head temperature of the fuel injector after each injection is completed; When the injector oil head temperature has not dropped to the preset temperature value, the injector corresponding to each engine cylinder that is switched to the reverse drag state is controlled again to spray the preset injection amount once in turn, and this cycle is repeated until the injector oil temperature corresponding to each injector drops to the preset temperature value.

7. A device for reducing the temperature of a fuel injector head, characterized in that: include: 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 the braking state to switch to the reverse drag state when it is detected that the number of continuous engine operation exceeds a preset number of revolutions, and sequentially controlling the fuel injector corresponding to each engine cylinder switched to the reverse drag state to spray a preset injection amount to cool the fuel injector head, wherein the preset number of revolutions is the number of continuous engine operation corresponding to the temperature of the fuel injector head being the temperature limit; The mode recovery unit is used to control the engine to recover to the braking mode after cooling down all the injector heads.

8. A computer program product, characterized in that The method comprises computer-readable instructions, and when the computer-readable instructions are executed on an electronic device, the electronic device implements the method for reducing the temperature of the fuel injector head according to any one of claims 1 to 6.

9. An electronic device, characterized in that: The method comprises at least one processor and a memory connected to the processor, wherein: The memory is used to store computer programs; The processor is used to execute the computer program so that the electronic device can implement the method for reducing the temperature of the injector head as claimed in any one of claims 1 to 6.

10. A computer storage medium, characterized in that: The storage medium carries one or more computer programs, and when the one or more computer programs are executed by an electronic device, the electronic device can implement the method for reducing the temperature of the injector head as described in any one of claims 1 to 6.

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