Engine control method and device, computer readable storage medium and vehicle

Abstract

The invention provides an engine control method and device, a computer readable storage medium and a vehicle. The method comprises the steps that under the condition that an engine is in an idling working condition, the opening degree of an exhaust gas recirculation valve of the engine and the opening degree of a throttle valve of the engine are adjusted to the corresponding preset opening degrees correspondingly; the idling working condition is the working condition of non-load operation of the engine; after the opening degree of the exhaust gas recirculation valve and the opening degree of the throttle valve are adjusted to the corresponding preset opening degrees correspondingly, the pressure of an intake manifold of the engine is obtained; under the condition that the pressure of the intake manifold is smaller than or equal to the pressure threshold value, the opening degree of the exhaust gas recirculation valve and the opening degree of the throttle valve are increased, so that the pressure of the intake manifold is larger than the pressure threshold value, and the problem that in the prior art, the engine oil consumption generated by pumping engine oil is high due to the fact that the pressure of the intake manifold is low under the engine idling working condition is solved.

Description

Technical Field

[0001] The present application relates to the technical field of engine control, and in particular, to an engine control method, an engine control device, a computer-readable storage medium, and a vehicle. Background Art

[0002] When the engine is idling, the vacuum in the intake pipe is very high, causing a pressure imbalance inside and outside the crankcase. The oil in the crankcase will be sucked into the intake manifold pressure stabilizing chamber and deposited, resulting in ineffective loss of oil and high oil consumption. Summary of the Invention

[0003] The main purpose of the present application is to provide an engine control method, device, computer-readable storage medium and vehicle, so as to at least solve the problem in the prior art of high oil consumption caused by low intake manifold pressure under engine idle conditions.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a method for controlling an engine is provided, comprising: when the engine is in an idle condition, adjusting the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle of the engine to corresponding predetermined openings, respectively, and the idle condition is a condition in which the engine runs without load; after adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle to the corresponding predetermined openings, respectively, obtaining the pressure of the intake manifold of the engine; when the pressure of the intake manifold is less than or equal to a pressure threshold, increasing the opening of the exhaust gas recirculation valve and increasing the opening of the throttle so that the pressure of the intake manifold is greater than the pressure threshold.

[0005] Optionally, when the pressure of the intake manifold is less than or equal to a pressure threshold, the opening of the exhaust gas recirculation valve is increased and the opening of the throttle is increased so that the pressure of the intake manifold is greater than the pressure threshold, including: when the pressure of the intake manifold is less than or equal to the pressure threshold, obtaining the ambient temperature at the current moment to obtain the current ambient temperature; when the current ambient temperature is less than the temperature threshold, not adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle; when the current ambient temperature is greater than or equal to the temperature threshold, increasing the opening of the exhaust gas recirculation valve and the opening of the throttle so that the pressure of the intake manifold is greater than the pressure threshold.

[0006] Optionally, increasing the opening of the exhaust gas recirculation valve and increasing the opening of the throttle valve so that the pressure of the intake manifold is greater than the pressure threshold comprises: a first control step of controlling the opening of the exhaust gas recirculation valve to increase a first opening; an acquisition step of acquiring the oxygen content of the mixed gas in the intake manifold; a second control step of controlling the opening of the throttle valve to increase a second opening when the oxygen content of the mixed gas in the intake manifold is less than the oxygen content threshold so that the oxygen content of the mixed gas in the intake manifold is greater than or equal to the oxygen content threshold; and repeating the first control step, the acquisition step and the second control step in sequence at least once until the pressure of the intake manifold is greater than the pressure threshold.

[0007] Optionally, the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle of the engine are respectively adjusted to corresponding predetermined openings, including: obtaining the predetermined opening of the exhaust gas recirculation valve under the idle condition to obtain a first predetermined opening, obtaining the predetermined opening of the throttle under the idle condition to obtain a second predetermined opening, and obtaining a predetermined ignition advance angle for the idle condition; performing PID adjustment on the opening of the exhaust gas recirculation valve until the opening of the exhaust gas recirculation valve is equal to the first predetermined opening, performing PID adjustment on the opening of the throttle until the opening of the throttle is equal to the second predetermined opening, and performing PID adjustment on the ignition advance angle of the engine until the ignition advance angle is equal to the predetermined ignition advance angle.

[0008] Optionally, after adjusting the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle of the engine to corresponding predetermined openings respectively, and before obtaining the pressure of the intake manifold of the engine, the method further includes: obtaining the theoretical air-fuel ratio of the idle condition; while the fuel injection amount of the engine remains unchanged, adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle so that the actual air-fuel ratio is equal to the theoretical air-fuel ratio.

[0009] Optionally, after obtaining the pressure of the intake manifold of the engine, the method further includes: controlling the opening of the exhaust gas recirculation valve and the opening of the throttle valve to remain unchanged when the pressure of the intake manifold is greater than the pressure threshold.

[0010] Optionally, when the engine is in an idle condition, before adjusting the opening of the engine's exhaust gas recirculation valve and the opening of the engine's throttle to corresponding predetermined openings, the method further includes: obtaining operating parameters of the vehicle to which the engine belongs, the operating parameters including gear position, engine speed and throttle opening; determining that the engine is in the idle condition when a first condition or a second condition is met, the first condition being that the gear position is neutral and the engine speed is not equal to zero, and the second condition being that the throttle opening is equal to zero and the engine speed is not equal to zero.

[0011] According to another aspect of the present application, a control device for an engine is provided, comprising: a first adjustment unit for adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle of the engine to corresponding predetermined openings, respectively, when the engine is in an idle condition, wherein the idle condition is a condition in which the engine runs without load; a first acquisition unit for acquiring the pressure of the intake manifold of the engine after adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle to the corresponding predetermined openings, respectively; and a second adjustment unit for increasing the opening of the exhaust gas recirculation valve and the opening of the throttle when the pressure of the intake manifold is less than or equal to a pressure threshold, so that the pressure of the intake manifold is greater than the pressure threshold.

[0012] According to another aspect of the present application, a computer-readable storage medium is provided, which includes a stored program, wherein when the program is run, the device where the computer-readable storage medium is located is controlled to execute any one of the engine control methods.

[0013] According to another aspect of the present application, a vehicle is provided, comprising: an engine, one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include a control method for executing any one of the engines described.

[0014] By applying the technical solution of the present application, in the control method of the above-mentioned engine, when the engine is in an idling condition, the opening of the engine's exhaust gas recirculation valve and the opening of the engine's throttle are respectively adjusted to corresponding predetermined openings, and the pressure of the engine's intake manifold is detected at this time. If the pressure of the intake manifold is less than or equal to the pressure threshold, it indicates that the vacuum degree of the intake manifold is large and oil pumping will occur. By increasing the opening of the exhaust gas recirculation valve and the opening of the throttle so that the pressure of the intake manifold is greater than the pressure threshold, oil pumping can be avoided, and oil consumption can be greatly reduced. This solves the problem of high oil consumption caused by oil pumping due to low intake manifold pressure under engine idling condition in the prior art. Compared with the prior art that avoids oil pumping by adjusting the structure of the engine, this control method does not need to change the structure of the engine, is simple to operate, and has low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0016] Figure 1 A hardware structure block diagram of a mobile terminal for executing an engine control method provided in an embodiment of the present application is shown;

[0017] Figure 2 A schematic flow chart of an engine control method according to an embodiment of the present application is shown;

[0018] Figure 3 A schematic diagram of a process for detecting EGR valve icing according to an embodiment of the present application is shown;

[0019] Figure 4 A schematic diagram of a process for adjusting the opening of an EGR valve and the opening of a throttle valve according to an embodiment of the present application is shown;

[0020] Figure 5 A schematic flow chart of another engine control method provided according to an embodiment of the present application is shown;

[0021] Figure 6 A structural block diagram of an engine control device provided according to an embodiment of the present application is shown.

[0022] The above drawings include the following reference numerals:

[0023] 102 , processor; 104 , memory; 106 , transmission device; 108 , input / output device; 10 , first adjustment unit; 20 , first acquisition unit; 30 , second adjustment unit. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings 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 in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] For ease of description, some nouns or terms involved in the embodiments of the present application are explained below:

[0028] EGR valve: Exhaust gas recirculation valve, used to adjust the flow of recirculated exhaust gas.

[0029] PID: Proportional-Integral-Derivative controller.

[0030] ECU: Electronic Control Unit.

[0031] As introduced in the background technology, in the prior art, low intake manifold pressure under engine idling conditions results in high oil consumption caused by pumping oil. To solve this problem, the embodiments of the present application provide an engine control method, device, computer-readable storage medium and vehicle.

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0033] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1FIG. 1 is a hardware structure block diagram of a mobile terminal for an engine control method according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1 Only one is shown) a processor 102 (the processor 102 may include but is not limited to a microprocessor MCU or a programmable logic device FPGA and other processing devices) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input and output device 108 for communication functions. It will be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the mobile terminal. Figure 1 More or fewer components than shown, or with Figure 1 Different configurations shown.

[0034] Memory 104 can be used to store computer programs, such as software programs and modules for application software, such as the computer program corresponding to the engine control method in the embodiment of the present invention. Processor 102 executes the computer programs stored in memory 104 to execute various functional applications and data processing, thereby implementing the aforementioned method. Memory 104 may include high-speed random access memory (RAM) and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, memory 104 may further include memory remotely located from processor 102, which can be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof. Transmission device 106 is used to receive or transmit data via a network. Specific examples of such networks may include a wireless network provided by the mobile terminal's telecommunications provider. In one example, transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to enable communication with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0035] In this embodiment, a method for controlling an engine running on a mobile terminal, a computer terminal or a similar computing device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0036] Figure 2FIG. 1 is a flow chart of an engine control method according to an embodiment of the present application. Figure 2 As shown, the method includes the following steps:

[0037] Step S201, when the engine is in an idle condition, adjusting the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle of the engine to corresponding predetermined openings respectively, wherein the idle condition is a condition in which the engine is running without load;

[0038] Specifically, the engine electronic control data is set to use different control logic when the engine is in different modes. For example, when the engine is in idle mode, the engine will perform idle control PID according to the electronic control data settings to adjust the intake manifold pressure, EGR rate and ignition advance angle to adapt to idle conditions. Among them, the EGR rate is the opening of the exhaust gas recirculation valve, and the throttle opening is adjusted to achieve the adjustment of the intake manifold pressure.

[0039] Step S202, after adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle valve to the corresponding predetermined openings, obtaining the pressure of the intake manifold of the engine;

[0040] Specifically, after the opening of the EGR valve of the above-mentioned engine and the opening of the throttle of the above-mentioned engine are respectively adjusted to the corresponding predetermined openings, the engine runs stably at idle conditions, and then the pressure of the intake manifold of the above-mentioned engine is obtained to determine whether negative pressure occurs in the intake manifold at idle conditions.

[0041] Step S203 , when the pressure of the intake manifold is less than or equal to the pressure threshold, increasing the opening of the EGR valve and the opening of the throttle valve, so that the pressure of the intake manifold is greater than the pressure threshold.

[0042] Specifically, when the pressure of the above-mentioned intake manifold is less than or equal to the pressure threshold, it indicates whether negative pressure appears in the intake manifold under idle conditions, and the vacuum degree is large, and the phenomenon of pumping oil will occur. Therefore, the opening of the above-mentioned EGR valve is increased and the opening of the above-mentioned throttle valve is increased to increase the pressure of the above-mentioned intake manifold, so that the pressure of the above-mentioned intake manifold is greater than the above-mentioned pressure threshold to avoid the phenomenon of pumping oil.

[0043] Through this embodiment, in the control method of the above-mentioned engine, when the engine is in the idle condition, the opening of the engine's exhaust gas recirculation valve and the opening of the engine's throttle are respectively adjusted to the corresponding predetermined openings, and the pressure of the engine's intake manifold is detected at this time. If the pressure of the intake manifold is less than or equal to the pressure threshold, it indicates that the vacuum degree of the intake manifold is large and pumping of oil will occur. By increasing the opening of the exhaust gas recirculation valve and the opening of the throttle so that the pressure of the intake manifold is greater than the pressure threshold, pumping of oil can be avoided, and oil consumption can be greatly reduced. This solves the problem of high oil consumption caused by pumping of oil due to low intake manifold pressure under the engine idle condition in the prior art. Compared with the prior art of avoiding pumping of oil by adjusting the structure of the engine, this control method does not need to change the structure of the engine, is simple to operate, and has low cost.

[0044] In order to prevent EGR valve failure, in an optional embodiment, as Figure 3 As shown, the above step S203 includes:

[0045] Step S2031, when the pressure of the intake manifold is less than or equal to the pressure threshold, obtaining the current ambient temperature to obtain the current ambient temperature;

[0046] Step S2032: when the current ambient temperature is less than the temperature threshold, the opening of the exhaust gas recirculation valve and the opening of the throttle valve are not adjusted;

[0047] Step S2033: When the current ambient temperature is greater than or equal to the temperature threshold, the opening of the exhaust gas recirculation valve and the opening of the throttle valve are increased so that the pressure of the intake manifold is greater than the pressure threshold.

[0048] In the above embodiment, when the pressure of the above-mentioned intake manifold is less than or equal to the pressure threshold, it is necessary to increase the opening of the EGR valve, but the low ambient temperature will cause the EGR valve to freeze, and continued adjustment will damage the EGR valve. Therefore, when the above-mentioned current ambient temperature is less than the temperature threshold, the opening of the above-mentioned exhaust gas recirculation valve and the opening of the above-mentioned throttle valve are not adjusted to prevent EGR valve failure. If the above-mentioned current ambient temperature is greater than or equal to the above-mentioned temperature threshold, the EGR valve will not freeze, and the opening of the above-mentioned EGR valve can be increased and the opening of the above-mentioned throttle valve can be increased so that the pressure of the above-mentioned intake manifold is greater than the above-mentioned pressure threshold.

[0049] In order to ensure that the fuel is fully burned, in an optional embodiment, Figure 4 As shown, the above step S203 also includes:

[0050] Step S2034, a first control step, controlling the opening of the exhaust gas recirculation valve to increase to a first opening;

[0051] Step S2035, obtaining step, obtaining the oxygen content of the mixed gas in the intake manifold;

[0052] Step S2036, a second control step, in which, when the oxygen content of the mixed air in the intake manifold is less than the oxygen content threshold, the throttle valve opening is controlled to increase by a second opening so that the oxygen content of the mixed air in the intake manifold is greater than or equal to the oxygen content threshold;

[0053] Step S2037: Repeat the first control step, the acquisition step, and the second control step in sequence at least once until the pressure of the intake manifold is greater than the pressure threshold.

[0054] In the above embodiment, controlling the opening of the EGR valve to increase the first opening will cause the oxygen content in the mixture in the intake manifold to decrease, resulting in incomplete combustion. Therefore, when the oxygen content of the mixture in the intake manifold is less than the oxygen content threshold, the opening of the throttle valve is controlled to increase the second opening to increase the air flow and increase the oxygen content of the mixture in the intake manifold, thereby increasing the pressure of the intake manifold while ensuring that the oxygen content of the mixture in the intake manifold does not decrease, ensuring full combustion of the fuel, preventing increased fuel consumption and facilitating exhaust gas treatment.

[0055] In order to ensure stable operation of the engine at idle speed, in an optional embodiment, the above step S201 includes:

[0056] Step S2011, obtaining the predetermined opening of the exhaust gas recirculation valve under the idle condition, obtaining a first predetermined opening, obtaining the predetermined opening of the throttle valve under the idle condition, obtaining a second predetermined opening, and obtaining a predetermined ignition advance angle under the idle condition;

[0057] Step S2012, performing PID adjustment on the opening of the exhaust gas recirculation valve until the opening of the exhaust gas recirculation valve is equal to the first predetermined opening, performing PID adjustment on the opening of the throttle valve until the opening of the throttle valve is equal to the second predetermined opening, and performing PID adjustment on the ignition advance angle of the engine until the ignition advance angle is equal to the predetermined ignition advance angle.

[0058] In the above embodiment, the engine will perform PID adjustment on the opening of the above-mentioned EGR valve according to the first predetermined opening, and perform PID adjustment on the opening of the above-mentioned throttle valve according to the second predetermined opening, until the opening of the above-mentioned EGR valve is equal to the above-mentioned first predetermined opening and the opening of the above-mentioned throttle valve is equal to the above-mentioned second predetermined opening, so as to prevent the opening from being adjusted too quickly, resulting in the engine being unable to run stably at idle conditions, for example, the speed fluctuates too much, and the ignition advance angle of the above-mentioned engine is PID adjusted until the above-mentioned ignition advance angle is equal to the above-mentioned predetermined ignition advance angle, so as to prevent engine knock, thereby ensuring the engine running stably at idle conditions.

[0059] To ensure stable operation of the engine at idle, in an optional embodiment, after adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle of the engine to corresponding predetermined openings, and before obtaining the pressure of the intake manifold of the engine, the method further includes:

[0060] Step S301, obtaining the theoretical air-fuel ratio of the idle condition;

[0061] Step S302 , while keeping the fuel injection amount of the engine unchanged, adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle valve so that the actual air-fuel ratio is equal to the theoretical air-fuel ratio.

[0062] In the above embodiment, the intake manifold pressure is increased under the control of the theoretical air-fuel ratio, and the opening of the above-mentioned exhaust gas recirculation valve and the opening of the above-mentioned throttle valve are adjusted so that the actual air-fuel ratio is equal to the above-mentioned theoretical air-fuel ratio, thereby preventing incomplete combustion or too slow combustion, which may cause unstable idling or jitter leading to flameout, and ensuring stable operation of the engine at idle conditions.

[0063] In order to save fuel consumption, in an optional embodiment, after obtaining the pressure of the intake manifold of the engine, the method further includes:

[0064] Step S401 : When the pressure of the intake manifold is greater than the pressure threshold, the opening of the exhaust gas recirculation valve and the opening of the throttle valve are controlled to remain unchanged.

[0065] In the above embodiment, the opening of the above-mentioned exhaust gas recirculation valve and the opening of the above-mentioned throttle valve are increased, and in order to ensure the air-fuel ratio, the fuel injection amount will be increased. When the pressure of the above-mentioned intake manifold is greater than the above-mentioned pressure threshold, the opening of the above-mentioned exhaust gas recirculation valve and the opening of the above-mentioned throttle valve are controlled to remain unchanged, and the fuel injection amount is no longer increased, thereby reducing fuel consumption and preventing the speed from increasing too much and causing unstable idling conditions.

[0066] In order to determine whether the engine is in an idle condition, in an optional embodiment, when the engine is in an idle condition, before adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle of the engine to corresponding predetermined openings, the method further includes:

[0067] Step S501, obtaining operating parameters of the vehicle to which the engine belongs, the operating parameters including gear position, engine speed and throttle opening;

[0068] Step S502, when the first condition or the second condition is met, it is determined that the above-mentioned engine is in the above-mentioned idle condition, the above-mentioned first condition is that the above-mentioned gear is neutral and the above-mentioned engine speed is not equal to zero, and the above-mentioned second condition is that the above-mentioned throttle opening is equal to zero and the above-mentioned engine speed is not equal to zero.

[0069] In the above embodiment, there are two types of idle conditions. The first is that when the gear is neutral and the engine speed is not equal to zero, the engine is in the idle condition. The second is that when the throttle opening is zero and the engine speed is not equal to zero, the engine is in the idle condition, so as to accurately judge whether the engine is in the idle condition.

[0070] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the engine control method of the present application will be described in detail below in combination with specific embodiments.

[0071] This embodiment relates to a specific engine control method, such as Figure 5 As shown, the following steps are included:

[0072] Step S1: Obtain engine operating data and determine whether the engine is in idle mode; wherein, the engine electronic control data is internally set to use different control logic when the engine is in different modes. For example, when the engine is in idle mode, the engine will perform idle control PID adjustment of intake manifold pressure, EGR rate, and ignition advance angle according to the electronic control data settings.

[0073] Step S2: Determine that the current engine is operating normally and obtain current ambient temperature parameters; wherein, when it is determined that the current engine is operating normally, signals are collected through the ECU and the ambient temperature sensor.

[0074] Step S3: The actual ambient temperature during engine operation is compared with the ambient temperature threshold in the electronic control data settings. If the actual ambient temperature is higher, the EGR valve and electronic throttle valve openings are calibrated and adjusted. The EGR valve opening calibration adjustment involves opening the EGR valve, increasing the exhaust gas flow through the EGR valve, and increasing the electronic throttle valve opening to increase intake manifold pressure under stoichiometric air-fuel ratio control. If the actual ambient temperature is lower than the ambient temperature threshold in the electronic control data settings, no calibration adjustment of the EGR valve and electronic throttle valve openings is performed.

[0075] Step S4: Control the EGR valve opening so that the intake manifold pressure value is greater than 30kPa; if the intake manifold pressure is monitored to be lower than 30kPa, continue to increase the EGR valve and electronic throttle opening until the intake manifold pressure meets the requirement of being greater than 30kPa, then stop adjusting the EGR valve and electronic throttle opening, and keep the EGR valve and electronic throttle opening at this position.

[0076] The embodiments of the present application also provide an engine control device. It should be noted that the engine control device of the embodiments of the present application can be used to execute the engine control method provided in the embodiments of the present application. The device is used to implement the above-mentioned embodiments and preferred embodiments, and the details that have been explained will not be repeated here. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

[0077] The following is an introduction to the engine control device provided in the embodiments of the present application.

[0078] Figure 6 Schematic diagram of the engine control device according to an embodiment of the present application. Figure 6 As shown, the device includes:

[0079] a first adjustment unit 10 for adjusting the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle of the engine to corresponding predetermined openings respectively when the engine is in an idle condition, wherein the idle condition is a condition in which the engine is running without load;

[0080] Specifically, the engine electronic control data is set to use different control logic when the engine is in different modes. For example, when the engine is in idle mode, the engine will perform idle control PID according to the electronic control data settings to adjust the intake manifold pressure, EGR rate and ignition advance angle to adapt to idle conditions. Among them, the EGR rate is the opening of the exhaust gas recirculation valve, and the throttle opening is adjusted to achieve the adjustment of the intake manifold pressure.

[0081] a first acquiring unit 20 for acquiring the pressure of the intake manifold of the engine after adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle valve to the corresponding predetermined openings;

[0082] Specifically, after the opening of the EGR valve of the above-mentioned engine and the opening of the throttle of the above-mentioned engine are respectively adjusted to the corresponding predetermined openings, the engine runs stably at idle conditions, and then the pressure of the intake manifold of the above-mentioned engine is obtained to determine whether negative pressure occurs in the intake manifold at idle conditions.

[0083] The second adjustment unit 30 is used to increase the opening of the exhaust gas recirculation valve and the opening of the throttle valve when the pressure of the intake manifold is less than or equal to the pressure threshold, so that the pressure of the intake manifold is greater than the pressure threshold.

[0084] Specifically, when the pressure of the above-mentioned intake manifold is less than or equal to the pressure threshold, it indicates whether negative pressure appears in the intake manifold under idle conditions, and the vacuum degree is large, and the phenomenon of pumping oil will occur. Therefore, the opening of the above-mentioned EGR valve is increased and the opening of the above-mentioned throttle valve is increased to increase the pressure of the above-mentioned intake manifold, so that the pressure of the above-mentioned intake manifold is greater than the above-mentioned pressure threshold to avoid the phenomenon of pumping oil.

[0085] Through this embodiment, in the control device of the above-mentioned engine, when the engine is in the idle condition, the first adjustment unit adjusts the opening of the engine's exhaust gas recirculation valve and the opening of the engine's throttle to the corresponding predetermined openings respectively, and the first acquisition unit obtains the pressure of the engine's intake manifold at this time. If the pressure of the intake manifold is less than or equal to the pressure threshold, it indicates that the vacuum degree of the intake manifold is large and pumping oil will occur. The second adjustment unit increases the opening of the exhaust gas recirculation valve and increases the opening of the throttle so that the pressure of the intake manifold is greater than the pressure threshold, thereby avoiding pumping oil and greatly reducing the oil consumption. This solves the problem of high oil consumption caused by pumping oil due to low intake manifold pressure under the engine idle condition in the prior art. Compared with the prior art of avoiding pumping oil by adjusting the structure of the engine, this control method does not need to change the structure of the engine, is simple to operate, and has low cost.

[0086] In order to prevent EGR valve failure, in an optional embodiment, as Figure 3 As shown, the second adjustment unit includes:

[0087] a first acquisition module, configured to acquire the current ambient temperature when the pressure of the intake manifold is less than or equal to a pressure threshold, to obtain the current ambient temperature;

[0088] a first regulating module, configured to, when the current ambient temperature is lower than a temperature threshold, not regulate the opening of the exhaust gas recirculation valve and the opening of the throttle valve;

[0089] The second regulating module is configured to increase the opening of the exhaust gas recirculation valve and the opening of the throttle valve when the current ambient temperature is greater than or equal to the temperature threshold, so that the pressure of the intake manifold is greater than the pressure threshold.

[0090] In the above embodiment, when the pressure of the above-mentioned intake manifold is less than or equal to the pressure threshold, it is necessary to increase the opening of the EGR valve, but the low ambient temperature will cause the EGR valve to freeze, and continued adjustment will damage the EGR valve. Therefore, when the above-mentioned current ambient temperature is less than the temperature threshold, the opening of the above-mentioned exhaust gas recirculation valve and the opening of the above-mentioned throttle valve are not adjusted to prevent EGR valve failure. If the above-mentioned current ambient temperature is greater than or equal to the above-mentioned temperature threshold, the EGR valve will not freeze, and the opening of the above-mentioned EGR valve can be increased and the opening of the above-mentioned throttle valve can be increased so that the pressure of the above-mentioned intake manifold is greater than the above-mentioned pressure threshold.

[0091] In order to ensure that the fuel is fully burned, in an optional embodiment, Figure 4 As shown, the second adjustment unit further includes:

[0092] a first control module, configured to execute a first control step to control the opening of the exhaust gas recirculation valve to increase a first opening;

[0093] a second acquisition module, configured to execute an acquisition step to acquire the oxygen content of the mixed gas in the intake manifold;

[0094] a second control module configured to execute a second control step of controlling the throttle valve to increase an opening by a second degree when the oxygen content of the mixed air in the intake manifold is less than an oxygen content threshold, so that the oxygen content of the mixed air in the intake manifold is greater than or equal to the oxygen content threshold;

[0095] A repeating module is used to sequentially repeat the first control step, the acquisition step and the second control step at least once until the pressure of the intake manifold is greater than the pressure threshold.

[0096] In the above embodiment, controlling the opening of the EGR valve to increase the first opening will cause the oxygen content in the mixture in the intake manifold to decrease, resulting in incomplete combustion. Therefore, when the oxygen content of the mixture in the intake manifold is less than the oxygen content threshold, the opening of the throttle valve is controlled to increase the second opening to increase the air flow and increase the oxygen content of the mixture in the intake manifold, thereby increasing the pressure of the intake manifold while ensuring that the oxygen content of the mixture in the intake manifold does not decrease, ensuring full combustion of the fuel, preventing increased fuel consumption and facilitating exhaust gas treatment.

[0097] In order to ensure stable operation of the engine at idle speed, in an optional embodiment, the first adjustment unit includes:

[0098] a third acquisition module, configured to acquire the predetermined opening of the exhaust gas recirculation valve under the idle condition to obtain a first predetermined opening, acquire the predetermined opening of the throttle valve under the idle condition to obtain a second predetermined opening, and acquire a predetermined ignition advance angle under the idle condition;

[0099] The third adjustment module is used to perform PID adjustment on the opening of the above-mentioned exhaust gas recirculation valve until the opening of the above-mentioned exhaust gas recirculation valve is equal to the above-mentioned first predetermined opening, perform PID adjustment on the opening of the above-mentioned throttle valve until the opening of the above-mentioned throttle valve is equal to the above-mentioned second predetermined opening, and perform PID adjustment on the ignition advance angle of the above-mentioned engine until the ignition advance angle is equal to the above-mentioned predetermined ignition advance angle.

[0100] In the above embodiment, the engine will perform PID adjustment on the opening of the above-mentioned EGR valve according to the first predetermined opening, and perform PID adjustment on the opening of the above-mentioned throttle valve according to the second predetermined opening, until the opening of the above-mentioned EGR valve is equal to the above-mentioned first predetermined opening and the opening of the above-mentioned throttle valve is equal to the above-mentioned second predetermined opening, so as to prevent the opening from being adjusted too quickly, resulting in the engine being unable to run stably at idle conditions, for example, the speed fluctuates too much, and the ignition advance angle of the above-mentioned engine is PID adjusted until the above-mentioned ignition advance angle is equal to the above-mentioned predetermined ignition advance angle, so as to prevent engine knock, thereby ensuring the engine running stably at idle conditions.

[0101] In order to ensure stable operation of the engine at idle speed, in an optional embodiment, the above device further includes:

[0102] an acquisition module, configured to acquire the theoretical air-fuel ratio of the idle condition after adjusting the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle valve of the engine to corresponding predetermined openings and before acquiring the pressure of the intake manifold of the engine;

[0103] The fourth regulating module is used to adjust the opening of the exhaust gas recirculation valve and the opening of the throttle valve while keeping the fuel injection amount of the engine unchanged, so that the actual air-fuel ratio is equal to the theoretical air-fuel ratio.

[0104] In the above embodiment, the intake manifold pressure is increased under the control of the theoretical air-fuel ratio, and the opening of the above-mentioned exhaust gas recirculation valve and the opening of the above-mentioned throttle valve are adjusted so that the actual air-fuel ratio is equal to the above-mentioned theoretical air-fuel ratio, thereby preventing incomplete combustion or too slow combustion, which may cause unstable idling or jitter leading to flameout, and ensuring stable operation of the engine at idle conditions.

[0105] In order to save fuel consumption, in an optional embodiment, the above device further includes:

[0106] The control unit is used to, after obtaining the pressure of the intake manifold of the engine, control the opening of the exhaust gas recirculation valve and the opening of the throttle valve to remain unchanged when the pressure of the intake manifold is greater than the pressure threshold.

[0107] In the above embodiment, the opening of the above-mentioned exhaust gas recirculation valve and the opening of the above-mentioned throttle valve are increased, and in order to ensure the air-fuel ratio, the fuel injection amount will be increased. When the pressure of the above-mentioned intake manifold is greater than the above-mentioned pressure threshold, the opening of the above-mentioned exhaust gas recirculation valve and the opening of the above-mentioned throttle valve are controlled to remain unchanged, and the fuel injection amount is no longer increased, thereby reducing fuel consumption and preventing the speed from increasing too much and causing unstable idling conditions.

[0108] In order to determine whether the engine is in an idle state, in an optional embodiment, the above-mentioned device further includes:

[0109] a second acquiring unit, configured to acquire operating parameters of a vehicle to which the engine belongs before adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle valve of the engine to corresponding predetermined openings when the engine is in an idle state, the operating parameters including a gear position, an engine speed, and an throttle opening;

[0110] The determination unit is used to determine that the above-mentioned engine is in the above-mentioned idle condition when a first condition or a second condition is met, the above-mentioned first condition is that the above-mentioned gear is neutral and the above-mentioned engine speed is not equal to zero, and the above-mentioned second condition is that the above-mentioned throttle opening is equal to zero and the above-mentioned engine speed is not equal to zero.

[0111] In the above embodiment, there are two types of idle conditions. The first is that when the gear is neutral and the engine speed is not equal to zero, the engine is in the idle condition. The second is that when the throttle opening is zero and the engine speed is not equal to zero, the engine is in the idle condition, so as to accurately judge whether the engine is in the idle condition.

[0112] The engine control device includes a processor and a memory. The first adjustment unit, the first acquisition unit, the second adjustment unit, and the like are stored as program units in the memory. The processor executes the program units stored in the memory to implement the corresponding functions. The modules are all located in the same processor; alternatively, the modules may be located in different processors in any combination.

[0113] The processor includes a kernel, which retrieves corresponding program units from memory. One or more kernels can be configured, and kernel parameters are adjusted to address the prior art issue of high oil consumption caused by low intake manifold pressure during engine idle conditions.

[0114] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0115] An embodiment of the present invention provides a computer-readable storage medium, which includes a stored program. When the program is executed, the device where the computer-readable storage medium is located is controlled to execute the engine control method.

[0116] Specifically, the engine control method includes:

[0117] Step S201, when the engine is in an idle condition, adjusting the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle of the engine to corresponding predetermined openings respectively, wherein the idle condition is a condition in which the engine is running without load;

[0118] Specifically, the engine electronic control data is set to use different control logic when the engine is in different modes. For example, when the engine is in idle mode, the engine will perform idle control PID according to the electronic control data settings to adjust the intake manifold pressure, EGR rate and ignition advance angle to adapt to idle conditions. Among them, the EGR rate is the opening of the exhaust gas recirculation valve, and the throttle opening is adjusted to achieve the adjustment of the intake manifold pressure.

[0119] Step S202, after adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle valve to the corresponding predetermined openings, obtaining the pressure of the intake manifold of the engine;

[0120] Specifically, after the opening of the EGR valve of the above-mentioned engine and the opening of the throttle of the above-mentioned engine are respectively adjusted to the corresponding predetermined openings, the engine runs stably at idle conditions, and then the pressure of the intake manifold of the above-mentioned engine is obtained to determine whether negative pressure occurs in the intake manifold at idle conditions.

[0121] Step S203 , when the pressure of the intake manifold is less than or equal to the pressure threshold, increasing the opening of the EGR valve and the opening of the throttle valve, so that the pressure of the intake manifold is greater than the pressure threshold.

[0122] Specifically, when the pressure of the above-mentioned intake manifold is less than or equal to the pressure threshold, it indicates whether negative pressure appears in the intake manifold under idle conditions, and the vacuum degree is large, and the phenomenon of pumping oil will occur. Therefore, the opening of the above-mentioned EGR valve is increased and the opening of the above-mentioned throttle valve is increased to increase the pressure of the above-mentioned intake manifold, so that the pressure of the above-mentioned intake manifold is greater than the above-mentioned pressure threshold to avoid the phenomenon of pumping oil.

[0123] An embodiment of the present invention provides a processor, which is used to run a program, wherein the engine control method is executed when the program is run.

[0124] Specifically, the engine control method includes:

[0125] Step S201, when the engine is in an idle condition, adjusting the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle of the engine to corresponding predetermined openings respectively, wherein the idle condition is a condition in which the engine is running without load;

[0126] Specifically, the engine electronic control data is set to use different control logic when the engine is in different modes. For example, when the engine is in idle mode, the engine will perform idle control PID according to the electronic control data settings to adjust the intake manifold pressure, EGR rate and ignition advance angle to adapt to idle conditions. Among them, the EGR rate is the opening of the exhaust gas recirculation valve, and the throttle opening is adjusted to achieve the adjustment of the intake manifold pressure.

[0127] Step S202, after adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle valve to the corresponding predetermined openings, obtaining the pressure of the intake manifold of the engine;

[0128] Specifically, after the opening of the EGR valve of the above-mentioned engine and the opening of the throttle of the above-mentioned engine are respectively adjusted to the corresponding predetermined openings, the engine runs stably at idle conditions, and then the pressure of the intake manifold of the above-mentioned engine is obtained to determine whether negative pressure occurs in the intake manifold at idle conditions.

[0129] Step S203 , when the pressure of the intake manifold is less than or equal to the pressure threshold, increasing the opening of the EGR valve and the opening of the throttle valve, so that the pressure of the intake manifold is greater than the pressure threshold.

[0130] Specifically, when the pressure of the above-mentioned intake manifold is less than or equal to the pressure threshold, it indicates whether negative pressure appears in the intake manifold under idle conditions, and the vacuum degree is large, and the phenomenon of pumping oil will occur. Therefore, the opening of the above-mentioned EGR valve is increased and the opening of the above-mentioned throttle valve is increased to increase the pressure of the above-mentioned intake manifold, so that the pressure of the above-mentioned intake manifold is greater than the above-mentioned pressure threshold to avoid the phenomenon of pumping oil.

[0131] An embodiment of the present invention provides a vehicle, comprising an engine, a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, at least the following steps are performed:

[0132] Step S201, when the engine is in an idle condition, adjusting the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle of the engine to corresponding predetermined openings respectively, wherein the idle condition is a condition in which the engine is running without load;

[0133] Specifically, the engine electronic control data is set to use different control logic when the engine is in different modes. For example, when the engine is in idle mode, the engine will perform idle control PID according to the electronic control data settings to adjust the intake manifold pressure, EGR rate and ignition advance angle to adapt to idle conditions. Among them, the EGR rate is the opening of the exhaust gas recirculation valve, and the throttle opening is adjusted to achieve the adjustment of the intake manifold pressure.

[0134] Step S202, after adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle valve to the corresponding predetermined openings, obtaining the pressure of the intake manifold of the engine;

[0135] Specifically, after the opening of the EGR valve of the above-mentioned engine and the opening of the throttle of the above-mentioned engine are respectively adjusted to the corresponding predetermined openings, the engine runs stably at idle conditions, and then the pressure of the intake manifold of the above-mentioned engine is obtained to determine whether negative pressure occurs in the intake manifold at idle conditions.

[0136] Step S203 , when the pressure of the intake manifold is less than or equal to the pressure threshold, increasing the opening of the EGR valve and the opening of the throttle valve, so that the pressure of the intake manifold is greater than the pressure threshold.

[0137] Specifically, when the pressure of the above-mentioned intake manifold is less than or equal to the pressure threshold, it indicates whether negative pressure appears in the intake manifold under idle conditions, and the vacuum degree is large, and the phenomenon of pumping oil will occur. Therefore, the opening of the above-mentioned EGR valve is increased and the opening of the above-mentioned throttle valve is increased to increase the pressure of the above-mentioned intake manifold, so that the pressure of the above-mentioned intake manifold is greater than the above-mentioned pressure threshold to avoid the phenomenon of pumping oil.

[0138] The present application also provides a computer program product, which, when executed on a data processing device, is adapted to execute a program for initializing at least the following method steps:

[0139] Step S201, when the engine is in an idle condition, adjusting the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle of the engine to corresponding predetermined openings respectively, wherein the idle condition is a condition in which the engine is running without load;

[0140] Specifically, the engine electronic control data is set to use different control logic when the engine is in different modes. For example, when the engine is in idle mode, the engine will perform idle control PID according to the electronic control data settings to adjust the intake manifold pressure, EGR rate and ignition advance angle to adapt to idle conditions. Among them, the EGR rate is the opening of the exhaust gas recirculation valve, and the throttle opening is adjusted to achieve the adjustment of the intake manifold pressure.

[0141] Step S202, after adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle valve to the corresponding predetermined openings, obtaining the pressure of the intake manifold of the engine;

[0142] Specifically, after the opening of the EGR valve of the above-mentioned engine and the opening of the throttle of the above-mentioned engine are respectively adjusted to the corresponding predetermined openings, the engine runs stably at idle conditions, and then the pressure of the intake manifold of the above-mentioned engine is obtained to determine whether negative pressure occurs in the intake manifold at idle conditions.

[0143] Step S203 , when the pressure of the intake manifold is less than or equal to the pressure threshold, increasing the opening of the EGR valve and the opening of the throttle valve, so that the pressure of the intake manifold is greater than the pressure threshold.

[0144] Specifically, when the pressure of the above-mentioned intake manifold is less than or equal to the pressure threshold, it indicates whether negative pressure appears in the intake manifold under idle conditions, and the vacuum degree is large, and the phenomenon of pumping oil will occur. Therefore, the opening of the above-mentioned EGR valve is increased and the opening of the above-mentioned throttle valve is increased to increase the pressure of the above-mentioned intake manifold, so that the pressure of the above-mentioned intake manifold is greater than the above-mentioned pressure threshold to avoid the phenomenon of pumping oil.

[0145] Obviously, those skilled in the art will appreciate that the various modules or steps of the present invention described above can be implemented using a general-purpose computing device, can be centralized on a single computing device, or can be distributed across a network of multiple computing devices. They can be implemented using program code executable by the computing device, and thus, can be stored in a storage device and executed by the computing device. In some cases, the steps shown or described herein can be performed in a different order than that shown, or can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0146] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0147] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0148] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0149] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0150] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0151] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0152] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can be implemented using any method or technology for information storage. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change RAM (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices, or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media, such as modulated data signals and carrier waves.

[0153] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0154] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0155] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0156] 1) In the engine control method of the present application, when the engine is in an idling condition, the opening of the engine's exhaust gas recirculation valve and the opening of the engine's throttle are respectively adjusted to corresponding predetermined openings, and the pressure of the engine's intake manifold is detected at this time. If the pressure of the intake manifold is less than or equal to the pressure threshold, it indicates that the vacuum degree of the intake manifold is large and oil pumping will occur. By increasing the opening of the exhaust gas recirculation valve and the opening of the throttle so that the pressure of the intake manifold is greater than the pressure threshold, oil pumping can be avoided, and oil consumption can be greatly reduced. This solves the problem of high oil consumption caused by oil pumping due to low intake manifold pressure under engine idling condition in the prior art. Compared with the prior art that avoids oil pumping by adjusting the engine structure, this control method does not require changing the engine structure, is simple to operate, and has low cost.

[0157] 2) In the engine control method of the present application, when the pressure of the above-mentioned intake manifold is less than or equal to the pressure threshold, the opening of the EGR valve needs to be increased. However, low ambient temperature may cause the EGR valve to freeze, and continued adjustment may damage the EGR valve. Therefore, when the above-mentioned current ambient temperature is less than the temperature threshold, the opening of the above-mentioned exhaust gas recirculation valve and the opening of the above-mentioned throttle valve are not adjusted to prevent EGR valve failure. If the above-mentioned current ambient temperature is greater than or equal to the above-mentioned temperature threshold, the EGR valve will not freeze, and the opening of the above-mentioned EGR valve and the opening of the above-mentioned throttle valve can be increased so that the pressure of the above-mentioned intake manifold is greater than the above-mentioned pressure threshold.

[0158] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A method for controlling an engine, characterized in that: include: When the engine is in an idle condition, adjusting the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle of the engine to corresponding predetermined openings respectively, wherein the idle condition is a condition in which the engine is running without load; After adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle valve to the corresponding predetermined openings, obtaining the pressure of the intake manifold of the engine; When the pressure of the intake manifold is less than or equal to a pressure threshold, the opening of the exhaust gas recirculation valve is increased and the opening of the throttle valve is increased so that the pressure of the intake manifold is greater than the pressure threshold.

2. The method according to claim 1, characterized in that When the pressure of the intake manifold is less than or equal to a pressure threshold, increasing the opening of the exhaust gas recirculation valve and increasing the opening of the throttle valve so that the pressure of the intake manifold is greater than the pressure threshold includes: When the pressure of the intake manifold is less than or equal to a pressure threshold, obtaining the current ambient temperature to obtain the current ambient temperature; When the current ambient temperature is less than a temperature threshold, not adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle valve; When the current ambient temperature is greater than or equal to the temperature threshold, the opening of the exhaust gas recirculation valve and the opening of the throttle valve are increased so that the pressure of the intake manifold is greater than the pressure threshold.

3. The method according to claim 1, characterized in that Increasing the opening of the exhaust gas recirculation valve and the opening of the throttle valve so that the pressure of the intake manifold is greater than the pressure threshold includes: A first control step of controlling the opening of the exhaust gas recirculation valve to increase a first opening; an acquisition step of acquiring the oxygen content of the mixed gas in the intake manifold; a second control step, when the oxygen content of the mixed air in the intake manifold is less than an oxygen content threshold, controlling the opening of the throttle valve to increase a second opening so that the oxygen content of the mixed air in the intake manifold is greater than or equal to the oxygen content threshold; The first control step, the acquisition step, and the second control step are sequentially repeated at least once until the pressure of the intake manifold is greater than the pressure threshold.

4. The method according to claim 1, wherein Adjusting the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle valve of the engine to corresponding predetermined openings, respectively, includes: Obtaining the predetermined opening of the exhaust gas recirculation valve under the idle condition to obtain a first predetermined opening, obtaining the predetermined opening of the throttle valve under the idle condition to obtain a second predetermined opening, and obtaining a predetermined ignition advance angle under the idle condition; The exhaust gas recirculation valve opening is PID-adjusted until the exhaust gas recirculation valve opening is equal to the first predetermined opening, the throttle valve opening is PID-adjusted until the throttle valve opening is equal to the second predetermined opening, and the engine ignition advance angle is PID-adjusted until the ignition advance angle is equal to the predetermined ignition advance angle.

5. The method according to any one of claims 1 to 4, characterized in that After adjusting the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle valve of the engine to corresponding predetermined openings, and before obtaining the pressure of the intake manifold of the engine, the method further includes: Obtaining a theoretical air-fuel ratio under the idle condition; When the fuel injection amount of the engine remains unchanged, the opening of the exhaust gas recirculation valve and the opening of the throttle valve are adjusted so that the actual air-fuel ratio is equal to the theoretical air-fuel ratio.

6. The method according to any one of claims 1 to 4, characterized in that After obtaining the pressure of the intake manifold of the engine, the method further includes: When the pressure of the intake manifold is greater than the pressure threshold, the opening of the exhaust gas recirculation valve and the opening of the throttle valve are controlled to remain unchanged.

7. The method according to any one of claims 1 to 4, characterized in that When the engine is in an idle state, before adjusting the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle of the engine to corresponding predetermined openings, the method further includes: Obtaining operating parameters of the vehicle to which the engine belongs, wherein the operating parameters include gear position, engine speed, and throttle opening; When the first condition or the second condition is met, it is determined that the engine is in the idle condition, the first condition being that the gear is neutral and the engine speed is not equal to zero, and the second condition being that the throttle opening is equal to zero and the engine speed is not equal to zero.

8. An engine control device, characterized in that: include: a first adjustment unit, configured to adjust the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle valve of the engine to corresponding predetermined openings respectively when the engine is in an idle condition, wherein the idle condition is a condition in which the engine is running without load; a first acquiring unit, configured to acquire the pressure of the intake manifold of the engine after adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle valve to the corresponding predetermined openings; The second adjustment unit is used to increase the opening of the exhaust gas recirculation valve and the opening of the throttle valve when the pressure of the intake manifold is less than or equal to the pressure threshold, so that the pressure of the intake manifold is greater than the pressure threshold.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the engine control method according to any one of claims 1 to 7.

10. A vehicle, characterized in that: include: An engine, one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include a method for executing the control method of the engine according to any one of claims 1 to 7.

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