Control method and device of engine, computer readable storage medium and vehicle

Abstract

The application provides a control method and device of an engine, a computer readable storage medium and a vehicle. The method comprises the following steps: adjusting the opening degree of an exhaust gas recirculation valve of the engine and the opening degree of a throttle valve of the engine to corresponding predetermined opening degrees respectively when the engine is in an idle operating condition, wherein the idle operating condition is an operating condition in which the engine is in no-load operation; obtaining the pressure of an intake manifold 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 predetermined opening degrees respectively; and increasing the opening degree of the exhaust gas recirculation valve and the opening degree of the throttle valve 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. The application solves the problem of high oil consumption caused by pumping oil due to low intake manifold pressure of the engine in the idle operating condition in the prior art.

Description

TECHNICAL FIELD

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

[0002] The vacuum degree in the intake pipe of the engine in the idle state is large, causing imbalance between the pressure inside and outside the crankcase, and the oil in the crankcase is sucked into the intake manifold pressure chamber and deposited, resulting in invalid loss of oil and high oil consumption. SUMMARY

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

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

[0005] Optionally, under the condition that the pressure of the intake manifold is less than or equal to the pressure threshold value, increasing the opening degree of the exhaust gas recirculation valve and the opening degree of the throttle valve so that the pressure of the intake manifold is greater than the pressure threshold value comprises: obtaining the current ambient temperature under the condition that the pressure of the intake manifold is less than or equal to the pressure threshold value, to obtain the current ambient temperature; not adjusting the opening degree of the exhaust gas recirculation valve and the opening degree of the throttle valve under the condition that the current ambient temperature is less than the temperature threshold value; and increasing the opening degree of the exhaust gas recirculation valve and the opening degree of the throttle valve so that the pressure of the intake manifold is greater than the pressure threshold value under the condition that the current ambient temperature is greater than or equal to the temperature threshold value.

[0006] Optionally, the increasing the opening of the exhaust gas recirculation valve and the 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 by a first opening; an acquisition step of acquiring the oxygen content of the mixture gas of the intake manifold; a second control step of, in the case that the oxygen content of the mixture gas of the intake manifold is less than an oxygen content threshold, controlling the opening of the throttle valve to increase by a second opening so that the oxygen content of the mixture gas of the intake manifold is greater than or equal to the oxygen content threshold; sequentially repeating 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.

[0007] Optionally, the 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 comprises: acquiring the predetermined opening of the exhaust gas recirculation valve under the idle operating condition to obtain a first predetermined opening, acquiring the predetermined opening of the throttle valve under the idle operating condition to obtain a second predetermined opening, and acquiring a predetermined ignition advance angle of the idle operating condition; PID adjusting the opening of the exhaust gas recirculation valve until the opening of the exhaust gas recirculation valve is equal to the first predetermined opening, PID adjusting the opening of the throttle valve until the opening of the throttle valve is equal to the second predetermined opening, and PID adjusting the ignition advance angle of the engine until the ignition advance angle is equal to the predetermined ignition advance angle.

[0008] Optionally, after the 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, before the acquiring the pressure of the intake manifold of the engine, the method further comprises: acquiring a theoretical air-fuel ratio of the idle operating condition; adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle valve so that an actual air-fuel ratio is equal to the theoretical air-fuel ratio in the case that the fuel injection amount of the engine remains unchanged.

[0009] Optionally, after the acquiring the pressure of the intake manifold of the engine, the method further comprises: in the case that the pressure of the intake manifold is greater than the pressure threshold, controlling the opening of the exhaust gas recirculation valve and the opening of the throttle valve to remain unchanged.

[0010] Optionally, before adjusting the opening degree of the exhaust gas recirculation valve of the engine and the opening degree of the throttle valve of the engine to corresponding predetermined opening degrees respectively in the case that the engine is in an idle operating condition, the method further comprises: acquiring an operating parameter of a vehicle to which the engine belongs, the operating parameter comprising a gear, an engine speed and a throttle opening degree; determining that the engine is in the idle operating condition in the case that a first condition or a second condition is met, the first condition being that the gear is a neutral gear and the engine speed is not equal to zero, and the second condition being that the throttle opening degree 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 of an engine is provided, comprising: a first adjusting unit configured to adjust an opening degree of an exhaust gas recirculation valve of the engine and an opening degree of a throttle valve of the engine to corresponding predetermined opening degrees respectively in the case that the engine is in an idle operating condition, the idle operating condition being an operating condition in which the engine is operated without load; a first acquiring unit configured to acquire a pressure of an intake manifold 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 predetermined opening degrees respectively; and a second adjusting unit configured to increase the opening degree of the exhaust gas recirculation valve and increase the opening degree of the throttle valve in the case that 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 still another aspect of the present application, a computer readable storage medium is provided, the computer readable storage medium comprising a stored program, wherein the computer readable storage medium is caused to perform any of the control methods of the engine when the program is executed.

[0013] According to yet 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 configured to be executed by the one or more processors, and the one or more programs comprise instructions for performing any of the control methods of the engine.

[0014] With the technical solution of the application, in the control method of the engine, when the engine is in an idle operating 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 respectively adjusted to corresponding predetermined opening degrees, the pressure of an intake manifold of the engine is detected, if the pressure of the intake manifold is less than or equal to a pressure threshold, it indicates that the vacuum degree of the intake manifold is relatively large and the pumping of oil will occur, the opening degree of the exhaust gas recirculation valve is increased and the opening degree of the throttle valve is increased, so that the pressure of the intake manifold is greater than the pressure threshold, that is, the pumping of oil can be avoided, the oil consumption of the engine is greatly reduced, and the problem of high oil consumption caused by the pumping of oil due to the low pressure of the intake manifold of the engine in the idle operating condition in the prior art is solved. Compared with the prior art which avoids the pumping of oil by adjusting the structure of the engine, the control method does not need to change the structure of the engine, is simple to operate, and has low cost. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the application and are incorporated herein in conjunction with the description of the application. The embodiments of the present application, and its description, are used to explain the present application and are not intended to limit the present application. In the drawings:

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

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

[0018] Figure 3 A flowchart of EGR valve icing detection according to an embodiment of the present application is shown;

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

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

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

[0022] Among them, the above-mentioned drawings include the following reference signs:

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

[0024] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0025] In order for those skilled in the technical field to better understand the scheme of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0026] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0027] For the convenience of description, part of the nouns or terms related to the embodiments of the present application are described as follows:

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

[0029] PID: that is, proportional-integral-derivative controller.

[0030] ECU: that is, electronic control unit.

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

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application.

[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 the case of running on a mobile terminal as an example, Figure 1This 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, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0034] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the engine control method in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory and non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the aforementioned networks may include wireless networks provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to communicate 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] This embodiment provides a control method for an engine running on a mobile terminal, computer terminal, or similar computing device. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

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

[0037] Step S201, adjusting the opening degree of an exhaust gas recirculation valve of the engine and the opening degree of a throttle valve of the engine to corresponding predetermined opening degrees respectively, under the condition that the engine is in an idle operating mode, the idle operating mode being an operating mode in which the engine is running without load;

[0038] Specifically, different control logics are adopted by the engine in different modes according to the internal engine electronic control data, for example, when the engine is in an idle mode, the engine adjusts the intake manifold pressure, the EGR rate and the ignition advance angle according to the PID control of the idle control set by the electronic control data, so as to adapt to the idle operating mode, wherein the EGR rate is the opening degree of the exhaust gas recirculation valve, and the opening degree of the throttle valve is adjusted to realize the adjustment of the intake manifold pressure.

[0039] Step S202, obtaining the pressure of the intake manifold 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 predetermined opening degrees respectively;

[0040] Specifically, after the opening degree of the EGR valve of the engine and the opening degree of the throttle valve of the engine are adjusted to the corresponding predetermined opening degrees respectively, the engine is stably running in the idle operating mode, and then the pressure of the intake manifold of the engine is obtained again to determine whether negative pressure occurs in the intake manifold under the idle operating mode.

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

[0042] Specifically, under the condition that the pressure of the intake manifold is less than or equal to the pressure threshold value, it indicates whether negative pressure occurs in the intake manifold under the idle operating mode, and the vacuum degree is large, which may cause the phenomenon of pumping oil, therefore, the opening degree of the EGR valve is increased and the opening degree of the throttle valve is increased, so as to increase the pressure of the intake manifold, so that the pressure of the intake manifold is greater than the pressure threshold value, to avoid the phenomenon of pumping oil.

[0043] By the embodiment, in the control method of the engine, when the engine is in the idling state, the opening of the EGR valve and the opening of the throttle valve are adjusted to the corresponding predetermined opening respectively, the pressure of the intake manifold of the engine is detected, 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 the oil pumping phenomenon occurs, the opening of the EGR 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, which can avoid the oil pumping and greatly reduce the oil consumption, solve the problem of high oil consumption caused by the low pressure of the intake manifold of the engine in the idling state in the prior art, compared with the prior art which avoids the oil pumping by adjusting the structure of the engine, the control method does not need to change the structure of the engine, is simple to operate and low in cost.

[0044] In order to prevent EGR valve failure, in an alternative embodiment, as shown in Figure 3 , the step S203 comprises:

[0045] Step S2031, in the case that the pressure of the intake manifold is less than or equal to the pressure threshold, the current ambient temperature is obtained to obtain the current ambient temperature;

[0046] Step S2032, in the case that the current ambient temperature is less than the temperature threshold, the opening of the EGR valve and the opening of the throttle valve are not adjusted;

[0047] Step S2033, in the case that the current ambient temperature is greater than or equal to the temperature threshold, the opening of the EGR 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.

[0048] In the above embodiment, in the case that the pressure of the intake manifold is less than or equal to the pressure threshold, the opening of the EGR valve needs to be increased, but low ambient temperature will cause the EGR valve to freeze, and continued adjustment will damage the EGR valve, therefore, in the case that the current ambient temperature is less than the temperature threshold, the opening of the EGR valve and the opening of the throttle valve are not adjusted, to prevent EGR valve failure, if the current ambient temperature is greater than or equal to the temperature threshold, the EGR valve will not freeze, and the opening of the EGR valve can be increased and the opening of the throttle valve can be increased, so that the pressure of the intake manifold is greater than the pressure threshold.

[0049] In order to ensure complete combustion of the fuel refill, in an alternative embodiment, as shown in Figure 4 , the step S203 further comprises:

[0050] Step S2034, the first control step, the opening of the EGR valve is controlled to increase by a first opening;

[0051] Step S2035, an acquisition step, acquiring the oxygen content of the mixture gas in the intake manifold;

[0052] Step S2036, a second control step, in the case where the oxygen content of the mixture gas in the intake manifold is less than the oxygen content threshold value, controlling the opening of the throttle valve to increase by a second opening so that the oxygen content of the mixture gas in the intake manifold is greater than or equal to the oxygen content threshold value;

[0053] Step S2037, sequentially repeating the first control step, the acquisition step and the second control step at least once until the pressure in the intake manifold is greater than the pressure threshold value.

[0054] In the above embodiment, controlling the opening of the EGR valve to increase by a first opening will cause the oxygen content of the mixture gas in the intake manifold to decrease and cause the problem of incomplete combustion, therefore, in the case where the oxygen content of the mixture gas in the intake manifold is less than the oxygen content threshold value, the opening of the throttle valve is controlled to increase by a second opening to increase the air flow and increase the oxygen content of the mixture gas in the intake manifold, so as to increase the pressure in the intake manifold while ensuring that the oxygen content of the mixture gas in the intake manifold does not decrease, ensuring complete combustion of fuel, preventing an increase in fuel consumption and facilitating exhaust gas treatment.

[0055] In order to ensure that the engine operates stably in the idle condition, in an alternative embodiment, the step S201 comprises:

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

[0057] Step S2012, PID adjusting the opening of the exhaust gas recirculation valve until the opening of the exhaust gas recirculation valve is equal to the first predetermined opening, PID adjusting the opening of the throttle valve until the opening of the throttle valve is equal to the second predetermined opening, and PID adjusting 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 adjusts the opening of the EGR valve according to the first predetermined opening and adjusts the opening of the throttle valve according to the second predetermined opening by PID control until the opening of the EGR valve is equal to the first predetermined opening and the opening of the throttle valve is equal to the second predetermined opening, so as to prevent the opening from being adjusted too fast and to cause the engine to be unable to operate stably in the idle state, for example, the speed fluctuates too much, and the engine adjusts the ignition advance angle of the engine by PID control until the ignition advance angle is equal to the predetermined ignition advance angle, so as to prevent the engine from knocking and to ensure that the engine operates stably in the idle state.

[0059] In order to ensure that the engine operates stably in the idle state, in an optional embodiment, after the opening of the EGR valve of the engine and the opening of the throttle valve of the engine are adjusted to the corresponding predetermined openings, before the pressure of the intake manifold of the engine is obtained, the method further comprises:

[0060] In step S301, the theoretical air-fuel ratio of the idle state is obtained.

[0061] In step S302, the opening of the EGR 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 while the fuel injection amount of the engine remains unchanged.

[0062] In the above embodiment, the intake manifold pressure is increased under the control of the theoretical air-fuel ratio, the opening of the EGR 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, and the insufficient combustion or slow combustion is prevented, so as to prevent the idle state from being unstable or shaking and causing the engine to stall, and to ensure that the engine operates stably in the idle state.

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

[0064] In step S401, the opening of the EGR valve and the opening of the throttle valve are controlled to remain unchanged when the pressure of the intake manifold is greater than the pressure threshold.

[0065] In the above embodiment, the opening of the EGR valve and the opening of the throttle valve are increased, and in order to ensure the air-fuel ratio, the fuel injection amount is increased. When the pressure of the intake manifold is greater than the pressure threshold, the opening of the EGR valve and the opening of the throttle valve are controlled to remain unchanged, and the fuel injection amount is no longer increased, so as to reduce fuel consumption and prevent the speed from increasing too much and causing the idle state to be unstable.

[0066] In order to determine whether the engine is in idle operating condition, in an alternative embodiment, before the opening degree of the exhaust gas recirculation valve of the engine and the opening degree of the throttle valve of the engine are adjusted to the corresponding predetermined opening degrees respectively in the case that the engine is in idle operating condition, the method further comprises:

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

[0068] Step S502, determining that the engine is in the idle operating condition in the case that the first condition or the second condition is met, 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 degree is equal to zero and the engine speed is not equal to zero.

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

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

[0071] The present embodiment relates to a specific engine control method, as shown in Figure 5 The method comprises the following steps:

[0072] Step S1: obtaining engine operating data and determining that the engine is in idle operating mode; wherein the engine control data is internally provided with different control logics for different modes of the engine, 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 settings of the engine control data.

[0073] Step S2: determining that the current engine is in normal operation and obtaining the current ambient temperature parameter; wherein the determination that the current engine is in normal operation is made through signal acquisition by the ECU and the ambient temperature sensor.

[0074] Step S3: based on the actual ambient temperature value in the current engine operation, compare the ambient temperature threshold value in the electronic control data setting, if the actual ambient temperature value is higher, the EGR valve and the electronic throttle opening are adjusted; wherein the EGR valve opening is adjusted, that is, the EGR valve is opened, the exhaust gas flow of the EGR valve is increased, the electronic throttle opening is increased, and the intake manifold pressure is increased under the control of the theoretical air-fuel ratio. If the actual ambient temperature value is lower than the ambient temperature threshold value in the electronic control data setting, the EGR valve and the electronic throttle opening are not adjusted.

[0075] Step S4: control the EGR valve opening so that the intake manifold pressure value is greater than 30kPa; wherein if the intake manifold pressure is monitored to be lower than 30kPa, the EGR valve and the electronic throttle opening are continuously increased until the intake manifold pressure meets the requirement of being greater than 30kPa, and then the adjustment of the EGR valve and the electronic throttle opening is stopped, and the EGR valve and the electronic throttle opening are kept at this position.

[0076] The engine control device provided by the embodiment of the present application can be used to execute the control method for the engine provided by the embodiment of the present application. The device for realizing the above-mentioned embodiments and preferred embodiments has been described and will not be repeated. As used below, the term "module" can be a combination of software and / or hardware that realizes a predetermined function. Although the device described in the following embodiments is preferably realized in software, hardware or a combination of software and hardware is also possible and is contemplated.

[0077] The engine control device provided by the embodiment of the present application is described below.

[0078] Figure 6 is a schematic diagram of the engine control device according to the embodiment of the present application. As shown in Figure 6 , the device includes:

[0079] The first adjustment unit 10 is used to adjust the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle valve of the engine to the corresponding predetermined opening respectively when the engine is in the idle operating condition, and the idle operating condition is the operating condition of the engine under no load.

[0080] Specifically, the engine electronic control data internally sets different control logics for the engine in different modes, for example: when the engine is in idle mode, the engine will adjust the intake manifold pressure, EGR rate and ignition advance angle according to the idle control PID adjustment of the electronic control data setting to adapt to the idle operating condition, wherein the EGR rate is the opening of the exhaust gas recirculation valve, and the opening of the throttle valve is adjusted to realize the adjustment of the intake manifold pressure.

[0081] The first acquisition unit 20 is configured to acquire the pressure of the intake manifold 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 predetermined opening degrees.

[0082] Specifically, after the opening degree of the EGR valve of the engine and the opening degree of the throttle valve of the engine are adjusted to the corresponding predetermined opening degrees, the engine is stably operated in the idle operating condition, and the pressure of the intake manifold of the engine is acquired again to determine whether the negative pressure occurs in the intake manifold in the idle operating condition.

[0083] The second adjustment unit 30 is configured to increase the opening degree of the exhaust gas recirculation valve and increase the opening degree 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 intake manifold is less than or equal to the pressure threshold, it indicates whether the negative pressure occurs in the intake manifold in the idle operating condition, and the vacuum degree is large, and the phenomenon of pumping oil may occur. Therefore, the opening degree of the EGR valve is increased and the opening degree of the throttle valve is increased to increase the pressure of the intake manifold, so that the pressure of the intake manifold is greater than the pressure threshold, to avoid the phenomenon of pumping oil.

[0085] According to the embodiment, in the control device of the engine, when the engine is in the idle operating condition, the first adjustment unit adjusts the opening degree of the exhaust gas recirculation valve of the engine and the opening degree of the throttle valve of the engine to the corresponding predetermined opening degrees, the first acquisition unit acquires the pressure of the intake manifold of the engine 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 the phenomenon of pumping oil may occur, and the second adjustment unit increases the opening degree of the exhaust gas recirculation valve and increases the opening degree of the throttle valve, so that the pressure of the intake manifold is greater than the pressure threshold, that is, the phenomenon of pumping oil can be avoided, the oil consumption of the engine is greatly reduced, and the problem of high oil consumption caused by the low pressure of the intake manifold of the engine in the idle operating condition in the prior art is solved. Compared with the prior art which avoids pumping oil by adjusting the structure of the engine, the 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 alternative embodiment, as shown in Figure 3 The second adjustment unit includes:

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

[0088] The first adjusting module is configured to not adjust the opening of the exhaust gas recirculation valve and the opening of the throttle valve when the current ambient temperature is less than the temperature threshold.

[0089] The second adjusting module is configured to increase the opening of the exhaust gas recirculation valve and increase 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 embodiment, when the pressure of the intake manifold is less than or equal to the pressure threshold, the opening of the EGR valve needs to be increased, but the low ambient temperature may cause the EGR valve to freeze, and the continued adjustment may damage the EGR valve. Therefore, 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, so as to prevent the EGR valve from being damaged. When the current ambient temperature is greater than or equal to the temperature threshold, the EGR valve will not freeze, and the opening of the EGR valve and the opening of the throttle valve can be increased, so that the pressure of the intake manifold is greater than the pressure threshold.

[0091] In order to ensure complete combustion of the fuel, in an optional embodiment, as shown in FIG. 8, the second adjusting unit further comprises: Figure 4

[0092] The first control module is configured to perform a first control step to control the opening of the exhaust gas recirculation valve to be increased by a first opening.

[0093] The second acquisition module is configured to perform an acquisition step to acquire the oxygen content of the mixture in the intake manifold.

[0094] The second control module is configured to perform a second control step to control the opening of the throttle valve to be increased by a second opening when the oxygen content of the mixture in the intake manifold is less than an oxygen content threshold, so that the oxygen content of the mixture in the intake manifold is greater than or equal to the oxygen content threshold.

[0095] The repeating module is configured 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 embodiment, the increase of the opening of the EGR valve by the first opening may cause the oxygen content of the mixture in the intake manifold to be reduced, which may cause 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 be increased by the second opening, so as to increase the air flow and increase the oxygen content of the mixture in the intake manifold, thereby ensuring that the oxygen content of the mixture in the intake manifold is not reduced while the pressure of the intake manifold is increased, ensuring complete combustion of the fuel, preventing the increase of fuel consumption and facilitating exhaust gas treatment.​

[0097] In order to ensure the stable operation of the engine in the idle condition, in an alternative embodiment, the first adjusting unit comprises:

[0098] The third obtaining module is configured to obtain the predetermined opening of the EGR valve in the idle condition to obtain a first predetermined opening, obtain the predetermined opening of the throttle valve in the idle condition to obtain a second predetermined opening, and obtain the predetermined ignition advance angle in the idle condition;

[0099] The third adjusting module is configured to perform PID adjustment on the opening of the EGR valve until the opening of the EGR valve is equal to the first predetermined opening, perform PID adjustment on the opening of the throttle valve until the opening of the throttle valve is equal to the second predetermined opening, and perform PID adjustment on the ignition advance angle of the engine until the ignition advance angle is equal to the predetermined ignition advance angle.

[0100] In the above embodiment, the engine performs PID adjustment on the opening of the EGR valve according to the first predetermined opening, performs PID adjustment on the opening of the throttle valve according to the second predetermined opening until the opening of the EGR valve is equal to the first predetermined opening and the opening of the throttle valve is equal to the second predetermined opening, prevents the opening adjustment from being too fast, which causes the engine to be unable to operate stably in the idle condition, for example, the speed fluctuation is too large, and performs PID adjustment on the ignition advance angle of the engine until the ignition advance angle is equal to the predetermined ignition advance angle, prevents the engine from knocking, and thus ensures the stable operation of the engine in the idle condition.

[0101] In order to ensure the stable operation of the engine in the idle condition, in an alternative embodiment, the device further comprises:

[0102] The obtaining module is configured to obtain the theoretical air-fuel ratio in the idle condition before obtaining the pressure of the intake manifold of the engine after adjusting the opening of the EGR valve of the engine and the opening of the throttle valve of the engine to the corresponding predetermined openings.

[0103] The fourth adjusting module is configured to adjust the opening of the EGR valve and the opening of the throttle valve so that the actual air-fuel ratio is equal to the theoretical air-fuel ratio while the fuel injection amount of the engine remains unchanged.

[0104] In the above embodiment, the intake manifold pressure is increased under the control of the theoretical air-fuel ratio, the opening of the EGR 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, and the insufficient combustion or slow combustion is prevented, which causes the idle condition to be unstable or to shake and cause the engine to stall, and thus the stable operation of the engine in the idle condition is ensured.

[0105] In order to save fuel consumption, in an alternative embodiment, the device further comprises:

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

[0107] In the above embodiment, the opening degree of the exhaust gas recirculation valve and the opening degree of the throttle valve are increased, which will lead to an increase in fuel injection amount in order to ensure the air-fuel ratio. In the case where the pressure of the intake manifold is greater than the pressure threshold, the opening degree of the exhaust gas recirculation valve and the opening degree of the throttle valve are kept unchanged, so that the fuel injection amount is no longer increased, fuel consumption is reduced, and the increase in engine speed is prevented from being too large to cause unstable idling condition.

[0108] In order to determine whether the engine is in an idling condition, in an alternative embodiment, the device further comprises:

[0109] A second obtaining unit is configured to, before adjusting the opening degree of the exhaust gas recirculation valve of the engine and the opening degree of the throttle valve of the engine to the corresponding predetermined opening degrees in the case where the engine is in an idling condition, obtain the operating parameters of the vehicle to which the engine belongs, the operating parameters including gear position, engine speed and accelerator opening degree.

[0110] A determination unit is configured to determine that the engine is in the idling condition in the case where the first condition or the 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 accelerator opening degree is equal to zero and the engine speed is not equal to zero.

[0111] In the above embodiment, there are two kinds of idling conditions, the first kind being that the engine is in the idling condition when the gear position is neutral and the engine speed is not equal to zero, and the second kind being that the engine is in the idling condition when the accelerator opening degree is equal to zero and the engine speed is not equal to zero, so as to accurately determine whether the engine is in the idling condition.

[0112] The control device of the engine comprises a processor and a memory, and the first adjusting unit, the first obtaining unit and the second adjusting unit are stored in the memory as program units, and the corresponding functions are realized by the processor executing the program units stored in the memory. The modules are located in the same processor; or, the modules are located in different processors in any combination.

[0113] The processor comprises a core, and the core retrieves corresponding program units in the memory.

[0114] The memory can comprise a 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 memory (flash RAM), and the memory comprises at least one memory chip.

[0115] The embodiment of the present application provides a computer readable storage medium, and the computer readable storage medium comprises a stored program, wherein the program controls a device where the computer readable storage medium is located to execute the engine control method when the program is running.

[0116] Specifically, the engine control method comprises:

[0117] In step S201, 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 corresponding predetermined opening degrees respectively when the engine is in an idle operating condition, and the idle operating condition is a condition in which the engine is in a no-load operation.

[0118] Specifically, different control logics are set in the engine electronic control data when the engine is in different modes, for example, when the engine is in an idle mode, the engine adjusts the intake manifold pressure, the EGR rate and the ignition advance angle according to the PID control of the idle control set in the electronic control data to adapt to the idle operating condition, wherein the EGR rate is the opening degree of the exhaust gas recirculation valve, and the opening degree of the throttle valve is adjusted to realize the adjustment of the intake manifold pressure.

[0119] In step S202, the pressure of the intake manifold of the engine is obtained after the opening degree of the exhaust gas recirculation valve and the opening degree of the throttle valve are adjusted to the corresponding predetermined opening degrees respectively.

[0120] Specifically, the engine is in a stable operation in the idle operating condition after the opening degree of the EGR valve of the engine and the opening degree of the throttle valve of the engine are adjusted to the corresponding predetermined opening degrees respectively, and then the pressure of the intake manifold of the engine is obtained again to determine whether negative pressure appears in the intake manifold in the idle operating condition.

[0121] In step S203, the opening degree of the EGR valve is increased and the opening degree of the throttle valve is increased when the pressure of the intake manifold is less than or equal to a pressure threshold value, so that the pressure of the intake manifold is greater than the pressure threshold value.

[0122] Specifically, in the case that the pressure of the intake manifold is less than or equal to the pressure threshold, it is indicated that whether the negative pressure of the intake manifold appears under the idle condition, and the vacuum degree is large, the phenomenon of pumping oil appears, therefore, the opening of the EGR valve is increased and the opening of the throttle valve is increased to increase the pressure of the intake manifold, so that the pressure of the intake manifold is greater than the pressure threshold, to avoid the phenomenon of pumping oil.

[0123] The embodiment of the present application provides a processor used for running a program, wherein the processor is used for executing the control method of the engine when the program is running.

[0124] Specifically, the control method of the engine comprises:

[0125] Step S201, in the case that the engine is in an idle condition, the opening of the EGR valve of the engine and the opening of the throttle valve of the engine are adjusted to corresponding predetermined openings respectively, and the idle condition is a condition that the engine is in no-load operation;

[0126] Specifically, the engine electric control data internally sets different control logics for different modes of the engine, for example: when the engine is in an idle mode, the engine adjusts the intake manifold pressure, the EGR rate and the ignition advance angle according to the PID control of the idle control set in the electric control data, to adapt to the idle condition, wherein the EGR rate is the opening of the EGR valve, and the opening of the throttle valve is adjusted to realize the adjustment of the intake manifold pressure.

[0127] Step S202, after the opening of the EGR valve and the opening of the throttle valve are adjusted to the corresponding predetermined openings respectively, the pressure of the intake manifold of the engine is obtained;

[0128] Specifically, after the opening of the EGR valve of the engine and the opening of the throttle valve of the engine are adjusted to the corresponding predetermined openings respectively, the engine is stably operated under the idle condition, and then the pressure of the intake manifold of the engine is obtained to determine whether the negative pressure of the intake manifold appears under the idle condition.

[0129] Step S203, in the case that the pressure of the intake manifold is less than or equal to the pressure threshold, the opening of the EGR 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.

[0130] Specifically, in the case that the pressure of the intake manifold is less than or equal to the pressure threshold, it indicates whether the negative pressure of the intake manifold appears under the idle condition, and the vacuum degree is large, the phenomenon of pumping oil appears, therefore, the opening of the EGR valve and the opening of the throttle valve are increased to increase the pressure of the intake manifold, so that the pressure of the intake manifold is greater than the pressure threshold, to avoid the phenomenon of pumping oil.

[0131] The embodiment of the present application provides a vehicle, which comprises an engine, a processor, a memory and a program stored in the memory and executable on the processor, and at least the following steps are implemented when the processor executes the program:

[0132] Step S201, in the case that the engine is in an idle condition, the opening of an exhaust gas recirculation valve of the engine and the opening of a throttle valve of the engine are adjusted to corresponding predetermined openings respectively, and the idle condition is a condition that the engine is in no-load operation;

[0133] Specifically, different control logics are adopted by the engine in different modes according to the internal engine electronic control data, for example, when the engine is in an idle mode, the engine adjusts the intake manifold pressure, the EGR rate and the ignition advance angle according to the PID control of the idle control of the electronic control data, so as to adapt to the idle condition, wherein the EGR rate is the opening of the exhaust gas recirculation valve, and the opening of the throttle valve is adjusted to realize the adjustment of the intake manifold pressure.

[0134] Step S202, after the opening of the exhaust gas recirculation valve and the opening of the throttle valve are adjusted to the corresponding predetermined openings respectively, the pressure of an intake manifold of the engine is acquired;

[0135] Specifically, after the opening of the EGR valve of the engine and the opening of the throttle valve of the engine are adjusted to the corresponding predetermined openings respectively, the engine is stably operated in the idle condition, and then the pressure of the intake manifold of the engine is acquired again, so as to determine whether the negative pressure of the intake manifold appears under the idle condition.

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

[0137] Specifically, in the case that the pressure of the intake manifold is less than or equal to the pressure threshold, it indicates whether the negative pressure of the intake manifold appears under the idle condition, and the vacuum degree is large, the phenomenon of pumping oil appears, therefore, the opening of the EGR valve and the opening of the throttle valve are increased to increase the pressure of the intake manifold, so that the pressure of the intake manifold is greater than the pressure threshold, to avoid the phenomenon of pumping oil.

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

[0139] Step S201, adjusting the opening degree of the exhaust gas recirculation valve of the engine and the opening degree of the throttle valve of the engine to corresponding predetermined opening degrees respectively, under the condition that the engine is in an idle operating mode, the idle operating mode being a mode in which the engine is running without load;

[0140] Specifically, different control logics are adopted by the engine in different modes according to the internal engine electronic control data, for example, when the engine is in an idle mode, the engine adjusts the intake manifold pressure, the EGR rate and the ignition advance angle according to the PID adjustment of the idle control set by the electronic control data, so as to adapt to the idle operating mode, wherein the EGR rate is the opening degree of the exhaust gas recirculation valve, and the opening degree of the throttle valve is adjusted to realize the adjustment of the intake manifold pressure.

[0141] Step S202, obtaining the pressure of the intake manifold 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 predetermined opening degrees respectively;

[0142] Specifically, after the opening degree of the EGR valve of the engine and the opening degree of the throttle valve of the engine are adjusted to the corresponding predetermined opening degrees respectively, the engine is stably running in the idle operating mode, and then the pressure of the intake manifold of the engine is obtained again to determine whether negative pressure occurs in the intake manifold under the idle operating mode.

[0143] Step S203, increasing the opening degree of the EGR valve and increasing the opening degree of the throttle valve 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.

[0144] Specifically, when the pressure of the intake manifold is less than or equal to a pressure threshold, it indicates whether negative pressure occurs in the intake manifold under the idle operating mode, and the vacuum degree is large, which may cause the phenomenon of pumping oil, therefore, the opening degree of the EGR valve is increased and the opening degree of the throttle valve is increased to increase the pressure of the intake manifold, so that the pressure of the intake manifold is greater than the pressure threshold, to avoid the phenomenon of pumping oil.

[0145] It should be apparent to those skilled in the art that the modules or steps of the application described above can be implemented with a general purpose computer, and can be centralized in a single computer or distributed among a network of computers, and can be implemented with program code executable by a computer, and thus can be stored in a storage device and executed by a computer, and in some cases, the steps shown or described can be executed in a different order than shown or described, or can be implemented as separate integrated circuit modules or as a single integrated circuit module, and thus the application is not limited to any particular combination of hardware and software.

[0146] Those skilled in the art will appreciate that embodiments of the application can be devised for a method, a system, or a computer program product. Accordingly, the application can be embodied in the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the application can be in the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk memory, CD-ROMs, optical storage media, etc.) embodying computer readable program code.

[0147] The present application is described in reference to the flowchart illustrations and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0148] These computer program instructions can 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 instructions which implement the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0149] These computer program instructions can 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 illustrations and / or block diagrams.Figure 1 one or more processes and / or blocks Figure 1 the function(s) specified in the flow block or blocks.

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

[0151] The memory can include non-persistent memory and / or volatile memory, such as random access memory (RAM) about which the computer stores information about an operating system. Memory is an example of computer readable media.

[0152] Computer readable media includes permanent and non-permanent, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (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 technology, compact disc read only memory (CD-ROM), digital versatile disc (DVD), or other optical storage, magnetic cassette, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible to a computing device. According to the definition herein, computer readable media does not include transitory media such as modulated data signals and carrier waves.

[0153] The technical features of the above-described embodiments can be combined in any manner. In order to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combination of the technical features does not contradict, it should be considered within the scope of the present specification.

[0154] It should also be noted that the terms "comprising", "including", or any other variant are intended to cover non-exclusive inclusions, so that processes, methods, articles or devices that include a series of elements not only include those elements, but also include other elements not explicitly listed, or inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or device including the element.

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

[0156] 1) In the engine control method of the application, when the engine is in an idle operating condition, the opening degree of the engine's exhaust gas recirculation valve and the opening degree of the engine's throttle valve are adjusted to corresponding predetermined opening degrees respectively, the pressure of the engine's intake manifold at this time is detected, if the pressure of the intake manifold is less than or equal to a pressure threshold, it indicates that the vacuum degree of the intake manifold is relatively high and the phenomenon of pumping oil will occur, increasing the opening degree of the exhaust gas recirculation valve and the opening degree of the throttle valve can make the pressure of the intake manifold greater than the pressure threshold, that is, it can avoid pumping oil and greatly reduce the oil consumption of the engine, solving the problem of high oil consumption caused by pumping oil due to low intake manifold pressure of the engine in the idle operating condition in the prior art, compared with the prior art which avoids pumping oil by adjusting the structure of the engine, the control method does not need to change the structure of the engine, is simple to operate and has low cost.

[0157] 2) In the engine control method of the application, in the case where the pressure of the above-mentioned intake manifold is less than or equal to the pressure threshold, the opening degree of the EGR valve needs to be increased, but low ambient temperature can cause the EGR valve to freeze, and continued adjustment can damage the EGR valve, therefore, in the case where the above-mentioned current ambient temperature is less than the temperature threshold, the opening degree of the above-mentioned exhaust gas recirculation valve and the opening degree 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 degree of the above-mentioned EGR valve and the opening degree 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 only describes the preferred embodiments of the application and is not intended to limit the application, and various modifications and changes can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A method for controlling an engine, characterized in that, include: When the engine is in idling condition, the predetermined opening degree of the exhaust gas recirculation valve under idling condition is obtained to obtain a first predetermined opening degree, the predetermined opening degree of the throttle valve under idling condition is obtained to obtain a second predetermined opening degree, the predetermined ignition advance angle under idling condition is obtained, and the opening degree of the exhaust gas recirculation valve and the opening degree of the throttle valve of the engine are adjusted to the corresponding predetermined opening degrees respectively. The idling condition is the condition in which the engine runs without load. After adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle valve to the corresponding predetermined openings, the pressure of the engine's intake manifold is obtained. When the pressure in the intake manifold is less than or equal to the pressure threshold, the opening of the exhaust gas recirculation valve and the opening of the throttle valve are increased, so that the pressure in the intake manifold is greater than the pressure threshold. Increasing the opening of the exhaust gas recirculation valve and the throttle opening to make the pressure in the intake manifold greater than the pressure threshold includes: a first control step, controlling the opening of the exhaust gas recirculation valve to increase by a first degree; an acquisition step, acquiring the oxygen content of the air-fuel mixture in the intake manifold; a second control step, when the oxygen content of the air-fuel mixture in the intake manifold is less than the oxygen content threshold, controlling the opening of the throttle opening to increase by a second degree, making the oxygen content of the air-fuel mixture in the intake manifold greater than or equal to the oxygen content threshold; repeating the first control step, the acquisition step, and the second control step at least once in sequence until the pressure in the intake manifold is greater than the pressure threshold.

2. The method according to claim 1, characterized in that, When the pressure in the intake manifold is less than or equal to a pressure threshold, increasing the opening of the exhaust gas recirculation valve and the opening of the throttle valve, so that the pressure in the intake manifold is greater than the pressure threshold, includes: If the pressure in the intake manifold is less than or equal to the pressure threshold, the current ambient temperature is obtained to get the current ambient temperature. When the current ambient temperature is lower than the temperature threshold, the opening of the exhaust gas recirculation valve and the opening of the throttle valve will not be adjusted. 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 in the intake manifold is greater than the pressure threshold.

3. The method according to claim 1, characterized in that, Adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle valve of the engine to their respective predetermined openings includes: The opening degree of the exhaust gas recirculation valve is adjusted by PID until the opening degree of the exhaust gas recirculation valve is equal to the first predetermined opening degree; the opening degree of the throttle valve is adjusted by PID until the opening degree of the throttle valve is equal to the second predetermined opening degree; and the ignition advance angle of the engine is adjusted by PID until the ignition advance angle is equal to the predetermined ignition advance angle.

4. The method according to any one of claims 1 to 3, characterized in that, After adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle valve of the engine to their respective predetermined openings, and before acquiring the pressure of the intake manifold of the engine, the method further includes: Obtain the theoretical air-fuel ratio for the idling condition; With the fuel injection quantity of the engine remaining constant, the opening degree of the exhaust gas recirculation valve and the opening degree of the throttle valve are adjusted so that the actual air-fuel ratio is equal to the theoretical air-fuel ratio.

5. The method according to any one of claims 1 to 3, characterized in that, After obtaining the pressure in the intake manifold of the engine, the method further includes: When the pressure in the intake manifold is greater than the pressure threshold, the opening degree of the exhaust gas recirculation valve and the opening degree of the throttle valve are kept constant.

6. The method according to any one of claims 1 to 3, characterized in that, Before adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle valve to their respective predetermined openings while the engine is idling, the method further includes: Obtain the operating parameters of the vehicle to which the engine belongs, including gear, engine speed and throttle opening; Under the condition of satisfying either the first condition or the second condition, the engine is determined to be in the idling condition. The first condition is that the gear is in neutral and the engine speed is not equal to zero. The second condition is that the throttle opening is equal to zero and the engine speed is not equal to zero.

7. A control device for an engine, characterized in that, include: The first adjustment unit is used to, when the engine is in an idling condition, obtain a predetermined opening degree of the exhaust gas recirculation valve under the idling condition, obtain a first predetermined opening degree, obtain a predetermined opening degree of the throttle valve under the idling condition, obtain a second predetermined opening degree, obtain a predetermined ignition advance angle under the idling condition, and adjust the opening degree of the exhaust gas recirculation valve and the opening degree of the throttle valve of the engine to the corresponding predetermined opening degrees respectively, wherein the idling condition is the condition in which the engine operates without load. The first acquisition unit is used to acquire the pressure of the engine intake manifold 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 in the intake manifold is less than or equal to the pressure threshold, so that the pressure in the intake manifold is greater than the pressure threshold. The second adjustment unit further includes: a first control module, configured to execute a first control step, controlling the opening of the exhaust gas recirculation valve to increase by a first degree; a second acquisition module, configured to execute an acquisition step, acquiring the oxygen content of the air-fuel mixture in the intake manifold; a second control module, configured to execute a second control step, controlling the opening of the throttle valve to increase by a second degree when the oxygen content of the air-fuel mixture in the intake manifold is less than an oxygen content threshold, such that the oxygen content of the air-fuel mixture in the intake manifold is greater than or equal to the oxygen content threshold; and a repeat module, configured to repeat the first control step, the acquisition step, and the second control step at least once in sequence until the pressure in the intake manifold is greater than the pressure threshold.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the engine control method according to any one of claims 1 to 6.

9. 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 configured to be executed by the one or more processors, the one or more programs including a control method for performing the engine according to any one of claims 1 to 6.

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