CN117685122A - Cold start injection control method and device, electronic equipment and vehicle - Google Patents
Cold start injection control method and device, electronic equipment and vehicle Download PDFInfo
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Abstract
The embodiment of the invention provides a cold start injection control method, a cold start injection control device, electronic equipment and a vehicle, and relates to the technical field of engine start. The cold start injection control method includes: under the condition that the temperature of the engine is lower than a temperature threshold value, responding to a received vehicle starting signal, and acquiring the rotating speed of the engine; under the condition that the engine speed reaches a first speed threshold, controlling an air passage injection nozzle of the engine to perform fuel injection, wherein the first speed threshold is smaller than an oil injection ignition critical speed; and after the engine speed reaches the fuel injection ignition critical speed, controlling a direct injection nozzle and the air passage injection nozzle of the engine to perform fuel injection. By the method, the in-cylinder fuel evaporation capacity of the vehicle under the low-temperature condition can be improved, and the start success rate of cold start of the vehicle is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of engine starting, in particular to a cold start injection control method and device, electronic equipment and a vehicle.
Background
With the continuous development of the automotive industry, engine starting is becoming a hotspot problem in the industry. At present, engine starting can be divided into cold starting and hot starting; the cold start refers to starting the engine for a period of time before the engine is shut down last time, and under the condition that the internal temperature of the engine is approximately consistent with the ambient temperature; the hot start refers to the start of the engine when the engine has a high residual temperature in the engine after the last shutdown time.
Whereas cold start of an engine is difficult to start with respect to heat, especially in the case of low ambient temperature in winter, because the internal temperature of the engine is too low during cold start and the fuel is not easily vaporized. At present, conventional vehicles all adopt an in-cylinder direct injection mode to perform cold start of the vehicle, and the mode has the problems that the cold start of the vehicle is difficult and the success rate of the vehicle start is low in a low-temperature environment.
Disclosure of Invention
The embodiment of the invention provides a cold start injection control method, a cold start injection control device, electronic equipment and a vehicle, so as to improve the in-cylinder fuel evaporation capacity of the vehicle under a low-temperature condition and improve the start success rate of cold start of the vehicle.
An embodiment of the present invention provides a cold start injection control method, including:
under the condition that the temperature of the engine is lower than a temperature threshold value, responding to a received vehicle starting signal, and acquiring the rotating speed of the engine;
controlling an air passage injection nozzle of the engine to perform fuel injection under the condition that the engine speed reaches a first speed threshold; the engine is a double-injection system engine, and the first rotation speed threshold value is smaller than the oil injection ignition critical rotation speed;
and after the engine speed reaches the fuel injection ignition critical speed, controlling a direct injection nozzle and the air passage injection nozzle of the engine to perform fuel injection.
Optionally, the method further comprises:
and under the condition that the engine is successfully started, controlling the direct injection nozzle to perform fuel injection.
Optionally, the method further comprises:
and determining that the engine is started successfully under the condition that the engine speed reaches a third speed threshold value and lasts for a first duration.
Optionally, the method further comprises:
monitoring the SOC of the battery;
the controlling the direct injection nozzle and the air passage injection nozzle of the engine to perform fuel injection includes:
and determining the fuel injection ratio between direct injection and air passage injection in the cylinder based on the battery SOC, and controlling the direct injection nozzle and the air passage injection nozzle to perform fuel injection according to the fuel injection ratio.
Optionally, the determining, based on the battery SOC, a fuel injection ratio between direct injection and air passage injection in the cylinder, and controlling the direct injection nozzle and the air passage injection nozzle to perform fuel injection according to the fuel injection ratio includes:
determining total fuel injection quantity and fuel injection proportion based on the battery SOC quantity and a pre-calibrated fuel injection strategy table;
and controlling the direct injection nozzle and the air passage injection nozzle to perform fuel injection according to the total fuel injection quantity and the fuel injection proportion.
Optionally, the method further comprises:
controlling an intake valve and an exhaust valve of the engine to open under the condition that the engine speed is less than or equal to a second speed threshold; the second rotation speed threshold value is smaller than the oil injection ignition critical rotation speed.
Optionally, the method further comprises:
and controlling the intake valve and the exhaust valve to normally open or close under the condition that the engine speed is larger than the second speed threshold.
A second aspect of an embodiment of the present invention provides a cold start injection control apparatus, including:
the rotating speed acquisition module is used for responding to the received vehicle starting signal to acquire the rotating speed of the engine under the condition that the temperature of the engine is lower than a temperature threshold value;
the first control module is used for controlling an air passage injection nozzle of the engine to perform fuel injection under the condition that the engine speed reaches a first speed threshold; the engine is a double-injection system engine, and the first rotation speed threshold value is smaller than the oil injection ignition critical rotation speed;
and the second control module is used for controlling the direct injection nozzle and the air passage injection nozzle of the engine to perform fuel injection after the engine speed reaches the fuel injection ignition critical speed.
Optionally, the apparatus further includes:
and the third control module is used for controlling the direct injection nozzle to perform fuel injection under the condition that the engine is started successfully.
Optionally, the apparatus further includes:
and the starting determining module is used for determining that the engine is started successfully under the condition that the engine speed reaches a third speed threshold value and lasts for a first duration.
Optionally, the apparatus further includes:
the monitoring module is used for monitoring the SOC of the battery;
the second control module includes:
and the double-injection control sub-module is used for determining the injection ratio between direct injection and air passage injection in the cylinder based on the battery SOC, and controlling the direct injection nozzle and the air passage injection nozzle to perform fuel injection according to the injection ratio.
Optionally, the dual spray control submodule includes:
the fuel injection determining sub-module is used for determining the total fuel injection quantity and the fuel injection proportion based on the battery SOC quantity and a pre-calibrated fuel injection strategy table;
and the fuel injection control sub-module is used for controlling the direct injection nozzle and the air passage injection nozzle to perform fuel injection according to the total fuel injection quantity and the fuel injection proportion.
Optionally, the apparatus further includes:
the fourth control module is used for controlling the opening of an intake valve and an exhaust valve of the engine under the condition that the rotating speed of the engine is less than or equal to a second rotating speed threshold value; the second rotation speed threshold value is smaller than the oil injection ignition critical rotation speed.
Optionally, the apparatus further includes:
and the fifth control module is used for controlling the intake valve and the exhaust valve to be normally opened or closed under the condition that the engine rotating speed is larger than the second rotating speed threshold value.
A third aspect of the embodiment of the present invention provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, the computer program implementing the cold start injection control method according to the first aspect of the embodiment of the present invention when executed by the processor.
A fourth aspect of the embodiments of the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the cold start injection control method according to the first aspect of the embodiments of the present invention.
A fifth aspect of the embodiment of the present invention provides a vehicle at least including an electronic control unit and a dual injection system engine, where the electronic control unit implements the cold start injection control method according to the first aspect of the embodiment of the present invention when executed.
According to the cold start injection control method provided by the embodiment of the invention, under the condition that the temperature of the engine is lower than the temperature threshold value, the engine rotating speed is obtained in response to receiving a vehicle start signal; under the condition that the rotating speed of the engine reaches a first rotating speed threshold value, controlling an air passage injection nozzle of the engine to perform fuel injection, wherein the first rotating speed threshold value is smaller than the fuel injection ignition critical rotating speed; after the engine speed reaches the fuel injection ignition critical speed, controlling a direct injection nozzle and an air channel injection nozzle of the engine to perform fuel injection; therefore, when the engine speed reaches a first rotation speed threshold before the oil injection ignition critical speed, the injection of the intake manifold is started, so that fuel is atomized in advance in the intake manifold, and after the engine speed reaches the oil injection ignition critical speed, direct injection and air channel injection are performed in the cylinder, the evaporation capacity of the fuel in the cylinder is improved under the low-temperature condition, and the starting success probability of the vehicle is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart illustrating a cold start injection control method according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of a low temperature cold start injection control method according to one embodiment of the present invention;
FIG. 3 is a block diagram of a cold start injection control device according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a flowchart showing a cold start injection control method according to an embodiment of the present invention, which can be applied to an electronic control unit (Elecmal Control Unit, ECU), i.e., a driving computer or an engine control unit. As shown in fig. 1, the cold start injection control method of the present embodiment may include the steps of:
step S11: in response to receiving the vehicle start signal, an engine speed is obtained when the engine temperature is below a temperature threshold.
In this embodiment, the electronic control unit of the vehicle may monitor the temperature of the engine in real time through the temperature sensor to obtain the engine temperature, where the engine temperature in this embodiment may be the engine oil temperature of the engine and/or the water temperature of the engine. The temperature threshold value is set in advance in the embodiment, the temperature threshold value in the embodiment characterizes the maximum temperature of the low-temperature environment, the temperature threshold value can be set arbitrarily according to requirements, for example, the temperature threshold value can be-35 ℃ or-30 ℃ and the like, and the specific value of the temperature threshold value is not limited in any way in the embodiment.
Under the condition that the temperature of the engine is lower than the temperature threshold value, the electronic control unit responds to the received vehicle starting signal to determine that the vehicle is in a cold starting working condition, at the moment, the electronic control unit can control the starter to start dragging, drive the engine to rotate, monitor the engine speed of the engine in real time and acquire the real-time engine speed.
It should be noted that, in this embodiment, the electronic control unit may determine whether the engine temperature is lower than the temperature threshold in response to receiving the vehicle start signal, and acquire the engine speed when it is determined that the engine temperature is lower than the temperature threshold; the method may also include determining whether a vehicle start signal is received when the engine temperature is determined to be lower than a temperature threshold, and acquiring an engine speed in response to receiving the vehicle start signal when the vehicle start signal is received; this embodiment is not limited thereto.
Step S12: controlling an air passage injection nozzle of the engine to perform fuel injection under the condition that the engine speed reaches a first speed threshold; the engine is a double-injection system engine, and the first rotation speed threshold value is smaller than the oil injection ignition critical rotation speed.
In this embodiment, a first rotation speed threshold is preset, where the first rotation speed threshold is a critical rotation speed at which the air passage injection is performed before the engine rotation speed reaches the injection ignition critical rotation speed, that is, the first rotation speed threshold is smaller than the injection ignition critical rotation speed of the engine. For example, if the fuel injection ignition critical speed of the vehicle is 300rpm, the first rotation speed threshold may be 250rpm, which is only a specific example, and the first rotation speed threshold of the present embodiment may be freely set according to the value of the fuel injection ignition critical speed, and the specific value of the first rotation speed threshold is not limited in this embodiment. The fuel injection ignition critical rotation speed of the embodiment is related to the type and the displacement of the vehicle, and the fuel injection ignition critical rotation speeds corresponding to different types or displacements of the vehicle are different.
And, the engine of the present embodiment is a dual injection system engine, and the vehicle is a vehicle including a dual injection system engine. The double injection system of the automobile engine, namely the composite injection system, is characterized in that a set of oil injection device is added on an air inlet channel on the basis of a direct injection engine in a cylinder, so that two sets of oil injection modes of combination of the air inlet channel injection PFI and the direct injection GDI in the cylinder are realized. That is, a dual injection system is one in which there are two injection nozzles per cylinder of the engine: a GDI direct injection nozzle is additionally provided with a PFI air passage injection nozzle, and a set of traditional PFI air passage injection nozzles are additionally arranged relative to a direct injection system. Currently, dual injection systems are more advanced and energy efficient than conventional direct in-cylinder injection systems.
When the engine speed reaches the first speed threshold, that is, when the engine speed reaches the first speed threshold and does not reach the fuel injection ignition critical speed, the electronic control unit specifically may control the PFI air flue injection nozzle of the engine to perform fuel injection when the first speed threshold is less than or equal to the engine speed less than the fuel injection ignition critical speed, so that the engine is directly subjected to intake manifold injection when dragging to the first speed threshold, and before the engine speed reaches the fuel injection ignition critical speed to perform engine ignition, advanced atomization of the intake fuel is realized, so that a part of fuel can be atomized in advance through air flue injection under the low-temperature condition, and a ignition condition is provided for subsequent engine ignition.
Step S13: and after the engine speed reaches the fuel injection ignition critical speed, controlling a direct injection nozzle and the air passage injection nozzle of the engine to perform fuel injection.
In this embodiment, the electronic control unit controls the engine to fire when it is determined that the engine speed reaches the fuel injection ignition threshold speed, and controls the GDI direct injection nozzle and the PFI airway injection nozzle of the engine to perform fuel injection together after the engine speed reaches the fuel injection ignition threshold speed. That is, the present embodiment changes the injection mode of the engine from the injection mode of the air passage injection to the injection mode of the air passage injection combined with the in-cylinder direct injection after the engine speed reaches the injection ignition threshold speed.
In this embodiment, when the electronic control unit determines that the engine is in the cold start condition under the low temperature state, the fuel injection mode of the engine may be flexibly switched by monitoring the engine speed in real time: under the condition that the rotation speed of the engine reaches a first rotation speed threshold value, adopting an intake manifold injection mode to realize advanced atomization of fuel; after the engine speed reaches the fuel injection ignition critical speed, a combined injection mode of intake manifold injection and in-cylinder direct injection is adopted to improve the fuel evaporation quantity in the cylinder under the low-temperature condition, provide favorable conditions for successful starting of the engine and improve the starting success probability of the vehicle.
In this embodiment, compared with the direct in-cylinder injection or the combined injection mode of direct in-cylinder injection and direct in-cylinder injection in the related art, the engine speed-based flexible switching engine oil injection mode can atomize a part of fuel in advance before engine ignition through air passage injection, and the better the atomization is, the easier the ignition is, so as to promote the fuel evaporation as much as possible.
In combination with the above embodiment, in an implementation manner, the embodiment of the present invention further provides a cold start injection control method. Specifically, in the present embodiment, in addition to the above steps, step S21 may be included:
step S21: and under the condition that the engine is successfully started, controlling the direct injection nozzle to perform fuel injection.
In this embodiment, after controlling the combined injection of the air passage injection and the in-cylinder direct injection, the electronic control unit may continuously monitor the state of the engine to determine whether the engine is started successfully, and may control the direct injection nozzle of the engine to perform the fuel injection if the engine is determined to be started successfully, that is, in this embodiment, when the engine is started successfully, the fuel injection mode of the engine is changed from the fuel injection mode of the air passage injection and the in-cylinder direct injection into the fuel injection mode of the in-cylinder direct injection, and the engine is controlled to perform the fuel injection in the fuel injection mode of the in-cylinder direct injection.
In the embodiment, after the engine is determined to be successfully started, the fuel injection mode of the engine can be changed from the combined injection of the air passage injection and the in-cylinder direct injection to the in-cylinder direct injection, so that the fuel combustion efficiency is improved on the basis of saving fuel.
In combination with the above embodiment, in one embodiment, it may be in a state of engine speed to determine whether the engine is started successfully. Specifically, in the cold start injection control method provided by the embodiment of the present invention, the method may further include the steps of: and determining that the engine is started successfully under the condition that the engine speed reaches a third speed threshold value and lasts for a first duration.
In this embodiment, the electronic control unit may determine that the engine start is successful in a case where it is determined that the engine speed reaches the third speed threshold for the first period of time. The third rotation speed threshold in this embodiment may be a preset engine starting rotation speed, for example, may be 600rpm, which is related to the type and the displacement of the vehicle, and the specific value of the third rotation speed threshold in this embodiment is not limited in any way. The first duration of this embodiment is a duration that indicates that the engine has been successfully started and that the engine reaches the starting speed, which is set in advance, for example, may be 0.1s, and similarly, the specific numerical value of the first duration is not limited in this embodiment.
In combination with the above embodiment, in an implementation manner, the embodiment of the present invention further provides a cold start injection control method. Specifically, in the method, step S31 may be included in addition to the above-described steps, and the "controlling the direct injection nozzle and the air passage injection nozzle of the engine to perform fuel injection" in step S13 may specifically include step S32:
step S31: and monitoring the SOC of the battery.
In this embodiment, the electronic control unit may monitor the SOC of the battery, where the SOC of the battery is State of Charge, and the State of Charge of the battery may also be referred to as a remaining power. Specifically, in this embodiment, after the starter is powered on, the SOC of the battery is monitored; or after the engine speed reaches the fuel injection ignition critical speed, the battery SOC may be monitored, which is not limited in this embodiment.
Step S32: and determining the fuel injection ratio between direct injection and air passage injection in the cylinder based on the battery SOC, and controlling the direct injection nozzle and the air passage injection nozzle to perform fuel injection according to the fuel injection ratio.
In this embodiment, when the electronic control unit controls the direct injection nozzle and the air channel injection nozzle of the engine to perform fuel injection, the fuel injection ratio between the optimal in-cylinder direct injection and the air channel injection corresponding to the current battery SOC is determined based on the monitored battery SOC, so that the direct injection nozzle and the air channel injection nozzle are controlled to perform fuel injection according to the fuel injection ratio determined in real time.
In this embodiment, after the engine speed reaches the fuel injection ignition critical speed, the fuel injection proportion in the combined injection can be reasonably distributed by monitoring the battery SOC, so as to further promote the atomization of the fuel in the cylinder, and achieve the best cold start effect under the low temperature condition.
In combination with the above embodiment, in another implementation manner, the embodiment of the present invention further provides a cold start injection control method. Specifically, in the present embodiment, the step S32 may specifically include step S41 and step S42:
step S41: and determining the total fuel injection quantity and the fuel injection proportion based on the battery SOC quantity and a pre-calibrated fuel injection strategy table.
In this embodiment, an oil injection policy table is calibrated in advance, where the oil injection policy table may be set in advance based on a large number of papers and related experimental data, and the oil injection policy table at least includes: the corresponding optimal total fuel injection quantity (namely the fuel demand) and the optimal fuel injection proportion under different battery SOC quantities. For example, in the case of a large SOC amount, the dragging force of the starter is large, so that the engine speed is high, and the fuel demand (i.e., the total fuel injection amount) is low; under the condition of smaller SOC, the dragging force of the starter is smaller, the engine rotating speed is lower, and then the oil demand (namely the total oil injection quantity) is higher. And the fuel injection proportion corresponding to different SOC amounts is also different.
In this embodiment, different pre-calibrated fuel injection strategy tables corresponding to different vehicle types and displacements are provided, so the electronic control unit may be a pre-calibrated fuel injection strategy table pre-stored with the corresponding vehicle type, so that when determining the fuel injection proportion, the total fuel injection amount and the fuel injection proportion between direct injection and air passage injection in the cylinder may be determined based on the current battery SOC and the corresponding pre-calibrated fuel injection strategy table.
Step S42: and controlling the direct injection nozzle and the air passage injection nozzle to perform fuel injection according to the total fuel injection quantity and the fuel injection proportion.
In this embodiment, after determining the optimal total fuel injection amount and the optimal fuel injection ratio corresponding to the current battery SOC, the fuel injection amounts of the direct injection nozzle and the air channel injection nozzle may be allocated according to the total fuel injection amount and the fuel injection ratio, so as to control the direct injection nozzle and the air channel injection nozzle to perform fuel injection according to the allocated fuel injection amounts, respectively.
In this embodiment, different optimal total fuel injection amounts and optimal fuel injection proportions can be determined according to different battery SOC amounts through a pre-calibrated fuel injection strategy table, so as to maximize in-cylinder fuel atomization.
In an alternative embodiment, the ratio of direct in-cylinder injection is higher than the ratio of direct air passage injection in the optimal injection ratio at different battery SOCs set in the injection strategy table.
In combination with the above embodiment, in another implementation manner, the embodiment of the present invention further provides a cold start injection control method. Specifically, in the present embodiment, in addition to the above steps, step S51 may be included:
step S51: controlling an intake valve and an exhaust valve of the engine to open under the condition that the engine speed is less than or equal to a second speed threshold; the second rotation speed threshold value is smaller than the oil injection ignition critical rotation speed.
The second rotation speed threshold value is preset in the embodiment, the second rotation speed threshold value is the maximum engine rotation speed representing that the engine is in a starting stage, and the second rotation speed threshold value in the embodiment is smaller than the fuel injection ignition critical rotation speed. The specific value of the second rotation speed threshold in this embodiment may be set arbitrarily according to the requirement of the project, for example, the second rotation speed threshold may be 100rpm,150rpm, etc., which is not limited in this embodiment.
The electronic control unit of the embodiment can determine whether the engine speed is greater than the second speed threshold when monitoring the engine speed, and can control the opening of the intake and exhaust valves of the engine under the condition that the engine speed is less than or equal to the second speed threshold, that is, under the condition that the engine speed is less than or equal to 0rpm and less than or equal to the second speed threshold.
Because the gas compression stroke is generated in the cylinder at the starting stage of engine starting, a reverse thrust (namely, compression expansion force) is generated, and the reverse thrust is a part of starting resistance.
In this embodiment, in the low-temperature cold start state of the engine, the engine start resistance may be reduced by opening the intake and exhaust valves at the start stage of the engine start, so as to improve the success rate of vehicle start.
In combination with the above embodiment, in an implementation manner, the embodiment of the present invention further provides a cold start injection control method. Specifically, in the present embodiment, in addition to the above steps, step S61 may be included:
step S61: and controlling the intake valve and the exhaust valve to normally open or close under the condition that the engine speed is larger than the second speed threshold.
In this embodiment, the electronic control unit may control the intake and exhaust valves of the engine to perform normal opening or closing of engine start when it is determined that the engine speed is greater than the second speed threshold.
In a usual engine starting stage, the opening and closing of the intake and exhaust valves of the engine are performed in a four-stroke stage after the engine is ignited, and the electronic brake unit of the embodiment can control the intake and exhaust valves of the engine to be normally opened or closed after monitoring that the engine speed reaches a second speed threshold (less than the fuel injection ignition critical speed).
In this embodiment, the intake and exhaust valves are normally opened and closed in a transition stage (i.e., the second rotation speed threshold is less than the engine rotation speed is less than the fuel injection ignition critical rotation speed) before the engine is ignited, so as to avoid the problem of untimely control caused by opening and closing the intake and exhaust valves only at the fuel injection ignition critical point of the engine, and improve the accuracy of engine starting control.
In combination with any of the above embodiments, in an implementation manner, the engine of the present embodiment may be a dual-injection gasoline engine, and the fuel of the engine is gasoline.
In another embodiment, as shown in fig. 2, fig. 2 is a schematic diagram of a low-temperature cold start injection control method according to an embodiment of the present invention. In this embodiment, the vehicle is a vehicle including a dual-injection engine, and after receiving a vehicle start signal, the ECU of the vehicle may monitor whether the engine oil temperature and/or water temperature of the engine is lower than-30 ℃, and determine that the engine is in a low-temperature cold start state when determining that the engine oil temperature and/or water temperature of the engine is lower than-30 ℃, and at this time, control the starter to start dragging the engine to rotate, and monitor the engine speed in real time.
The electronic control unit can control the opening of the air inlet and outlet valves of the engine under the condition that the engine rotating speed is less than or equal to 0rpm and less than or equal to 100rpm is determined, so that the air compression moment is reduced by opening the air inlet and outlet valves at the starting stage of the engine, the reduction of the starting resistance moment is realized, and the starting success rate of the vehicle is improved.
Under the condition that the engine speed is more than 100rpm (less than the fuel injection ignition critical speed), the electronic control unit can control the engine to normally open or close the intake and exhaust valves so as to normally open and close the intake and exhaust valves in a transitional stage before the engine is ignited, and the accuracy of engine starting control is improved.
Meanwhile, the electronic control unit of the embodiment can flexibly adjust the oil injection mode of the engine based on the rotation speed of the engine: specifically, before the engine speed drags to the fuel injection ignition critical speed (300 rpm), for example, in the case that the engine speed is less than or equal to 250rpm and less than the fuel injection ignition critical speed (300 rpm) is determined, air passage injection can be adopted, that is, intake manifold injection is started when the engine speed reaches 250rpm until the engine speed reaches the fuel injection ignition critical speed (300 rpm) for engine ignition, so that fuel can be atomized in advance in the intake manifold.
Under the condition that the engine speed is more than the fuel injection ignition critical speed (300 rpm), namely after the engine speed reaches the fuel injection ignition critical speed, the fuel injection mode is changed from the gas passage injection mode to the combined injection mode of the direct injection in the GDI cylinder and the PFI gas passage injection, and different calibration strategy tables are inquired according to battery capacities under different SOC (system on a chip) by monitoring the SOC (state of charge) of the battery so as to carry out different GDI+PFI fuel injection proportion distribution, thereby effectively and reasonably carrying out fuel injection proportion distribution, realizing the maximization of fuel atomization in the cylinder and achieving the optimal starting effect.
The electronic control unit can continuously monitor the state of the engine after controlling the engine to perform combined injection of air passage injection and in-cylinder direct injection, so as to determine whether the engine is started successfully, and under the condition that the engine is determined to be started continuously for a certain time (such as XX ms), the engine can be considered to be started successfully, and at the moment, the fuel injection mode of the engine can be controlled to be changed from the combined injection mode of the GDI in-cylinder direct injection and the PFI air passage injection into the GDI in-cylinder direct injection, so that the fuel combustion efficiency can be improved on the basis of saving fuel.
According to the low-temperature cold start injection control method, aiming at the problem that cold start of a vehicle is difficult under a low-temperature condition, dragging resistance moment is reduced by opening an intake valve and an exhaust valve at the starting stage, and whether an air passage injection, in-cylinder direct injection or double injection start is adopted in a vehicle injection system is synchronously optimized based on the rotation speed of an engine: when the engine drags to a certain rotating speed, the PFI is connected to perform manifold injection, so that advanced atomization of the air intake is realized; and after the fuel injection ignition critical speed is reached, fuel injection proportion distribution can be effectively and reasonably carried out through monitoring of the battery SOC quantity, so that the evaporation quantity of gasoline in a cylinder is improved under the low-temperature condition, and the vehicle starting probability is improved.
It should be noted that, for simplicity of description, the method embodiments are shown as a series of acts, but it should be understood by those skilled in the art that the embodiments are not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred embodiments, and that the acts are not necessarily required by the embodiments of the invention.
Based on the same inventive concept, an embodiment of the present invention provides a cold start injection control apparatus 300. Referring to fig. 3, fig. 3 is a block diagram illustrating a cold start injection control apparatus according to an embodiment of the present invention. As shown in fig. 3, the apparatus 300 includes:
the rotating speed obtaining module 300 is configured to obtain an engine rotating speed in response to receiving a vehicle start signal when the engine temperature is lower than a temperature threshold;
a first control module 301, configured to control an air passage injection nozzle of the engine to perform fuel injection when the engine speed reaches a first speed threshold; the engine is a double-injection system engine, and the first rotation speed threshold value is smaller than the oil injection ignition critical rotation speed;
and the second control module 302 is configured to control the direct injection nozzle and the air passage injection nozzle of the engine to perform fuel injection after the engine speed reaches the fuel injection ignition critical speed.
Optionally, the apparatus 300 further includes:
and the third control module is used for controlling the direct injection nozzle to perform fuel injection under the condition that the engine is started successfully.
Optionally, the apparatus 300 further includes:
and the starting determining module is used for determining that the engine is started successfully under the condition that the engine speed reaches a third speed threshold value and lasts for a first duration.
Optionally, the apparatus 300 further includes:
the monitoring module is used for monitoring the SOC of the battery;
the second control module 302 includes:
and the double-injection control sub-module is used for determining the injection ratio between direct injection and air passage injection in the cylinder based on the battery SOC, and controlling the direct injection nozzle and the air passage injection nozzle to perform fuel injection according to the injection ratio.
Optionally, the dual spray control submodule includes:
the fuel injection determining sub-module is used for determining the total fuel injection quantity and the fuel injection proportion based on the battery SOC quantity and a pre-calibrated fuel injection strategy table;
and the fuel injection control sub-module is used for controlling the direct injection nozzle and the air passage injection nozzle to perform fuel injection according to the total fuel injection quantity and the fuel injection proportion.
Optionally, the apparatus 300 further includes:
the fourth control module is used for controlling the opening of an intake valve and an exhaust valve of the engine under the condition that the rotating speed of the engine is less than or equal to a second rotating speed threshold value; the second rotation speed threshold value is smaller than the oil injection ignition critical rotation speed.
Optionally, the apparatus 300 further includes:
and the fifth control module is used for controlling the intake valve and the exhaust valve to be normally opened or closed under the condition that the engine rotating speed is larger than the second rotating speed threshold value.
Based on the same inventive concept, another embodiment of the present invention provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of the cold start injection control method according to any of the above embodiments of the present invention.
Based on the same inventive concept, another embodiment of the present invention provides an electronic device 400 as shown in fig. 4. Fig. 4 is a schematic diagram of an electronic device according to an embodiment of the present invention. The electronic device comprises a memory 402, a processor 401 and a computer program stored in the memory and executable on the processor, which when executed implements the steps of the cold start injection control method according to any of the above embodiments of the present invention.
Based on the same inventive concept, another embodiment of the present invention provides a vehicle including at least: the electronic control unit and the double injection system engine, wherein the electronic control unit realizes the steps in the cold start injection control method according to any embodiment of the invention when executing.
For the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments for relevant points.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
It will be apparent to those skilled in the art that embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the invention may take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or terminal device comprising the element.
The cold start injection control method, the cold start injection control device, the cold start injection control electronic equipment and the cold start injection control vehicle provided by the invention are described in detail, and specific examples are applied to illustrate the principle and the implementation mode of the cold start injection control method, the cold start injection control device, the cold start injection control electronic equipment and the cold start injection control vehicle, and the cold start injection control method, the cold start injection control device and the cold start injection control vehicle are only used for helping to understand the method and the core idea of the cold start injection control method; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (10)
1. A cold start injection control method, characterized by comprising:
under the condition that the temperature of the engine is lower than a temperature threshold value, responding to a received vehicle starting signal, and acquiring the rotating speed of the engine;
controlling an air passage injection nozzle of the engine to perform fuel injection under the condition that the engine speed reaches a first speed threshold; the engine is a double-injection system engine, and the first rotation speed threshold value is smaller than the oil injection ignition critical rotation speed;
and after the engine speed reaches the fuel injection ignition critical speed, controlling a direct injection nozzle and the air passage injection nozzle of the engine to perform fuel injection.
2. The cold start injection control method according to claim 1, characterized in that the method further comprises:
and under the condition that the engine is successfully started, controlling the direct injection nozzle to perform fuel injection.
3. The cold start injection control method according to claim 2, characterized in that the method further comprises:
and determining that the engine is started successfully under the condition that the engine speed reaches a third speed threshold value and lasts for a first duration.
4. The cold start injection control method according to claim 1, characterized in that the method further comprises:
monitoring the SOC of the battery;
the controlling the direct injection nozzle and the air passage injection nozzle of the engine to perform fuel injection includes:
and determining the fuel injection ratio between direct injection and air passage injection in the cylinder based on the battery SOC, and controlling the direct injection nozzle and the air passage injection nozzle to perform fuel injection according to the fuel injection ratio.
5. The cold start injection control method according to claim 4, wherein the determining an injection ratio between direct injection and gas passage injection in a cylinder based on the battery SOC amount, controlling the direct injection nozzle and the gas passage injection nozzle to perform fuel injection in accordance with the injection ratio, comprises:
determining total fuel injection quantity and fuel injection proportion based on the battery SOC quantity and a pre-calibrated fuel injection strategy table;
and controlling the direct injection nozzle and the air passage injection nozzle to perform fuel injection according to the total fuel injection quantity and the fuel injection proportion.
6. The cold start injection control method according to any one of claims 1 to 5, characterized in that the method further comprises:
controlling an intake valve and an exhaust valve of the engine to open under the condition that the engine speed is less than or equal to a second speed threshold; the second rotation speed threshold value is smaller than the oil injection ignition critical rotation speed.
7. The cold start injection control method according to claim 6, characterized in that the method further comprises:
and controlling the intake valve and the exhaust valve to normally open or close under the condition that the engine speed is larger than the second speed threshold.
8. A cold start injection control device, the device comprising:
the rotating speed acquisition module is used for responding to the received vehicle starting signal to acquire the rotating speed of the engine under the condition that the temperature of the engine is lower than a temperature threshold value;
the first control module is used for controlling an air passage injection nozzle of the engine to perform fuel injection under the condition that the engine speed reaches a first speed threshold; the engine is a double-injection system engine, and the first rotation speed threshold value is smaller than the oil injection ignition critical rotation speed;
and the second control module is used for controlling the direct injection nozzle and the air passage injection nozzle of the engine to perform fuel injection after the engine speed reaches the fuel injection ignition critical speed.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the computer program when executed by the processor implements the cold start injection control method of any one of claims 1 to 7.
10. A vehicle, characterized by at least comprising: an electronic control unit and a dual injection system engine; the electronic control unit, when executed, implements the cold start injection control method according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311815337.3A CN117685122A (en) | 2023-12-26 | 2023-12-26 | Cold start injection control method and device, electronic equipment and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311815337.3A CN117685122A (en) | 2023-12-26 | 2023-12-26 | Cold start injection control method and device, electronic equipment and vehicle |
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| CN117685122A true CN117685122A (en) | 2024-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311815337.3A Pending CN117685122A (en) | 2023-12-26 | 2023-12-26 | Cold start injection control method and device, electronic equipment and vehicle |
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| Country | Link |
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| CN (1) | CN117685122A (en) |
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2023
- 2023-12-26 CN CN202311815337.3A patent/CN117685122A/en active Pending
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