Control method for improving long idle speed adaptability of engine

Abstract

The invention provides a control method for improving long idle speed adaptability of an engine, which comprises the following steps: S1, judging whether the engine is in a parking idle speed state or not, if so, entering the next step, and if not, keeping the original state; s2, judging whether idling time is too long or not, if yes, entering the next step, and if not, keeping the original state; s3, the rotating speed of the engine is temporarily increased; s4, judging whether the machine is temporarily stopped, if so, entering the next step, and if not, keeping the original state; s5, temporarily stopping the machine; s6, judging whether to restart or not, if so, entering the next step, and if not, keeping the original state; and step S7, restarting. The idling time of the engine is shortened, the long idling adaptability of the engine is further improved, meanwhile, electricity utilization safety is guaranteed, the air conditioner using requirement of a user is met, and the vehicle using experience is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of engines, and in particular is a control method for improving the long idle speed adaptability of an engine. Background Art

[0002] At present, when drivers are waiting to pick up passengers or goods or taking a rest, they usually do not turn off the engine, that is, the engine is in the idling state for a long time, especially in hot or cold weather when cooling or heating is needed. Long-term idling of the engine causes many negative effects, such as excessive carbon deposits, oil leakage in the combustion chamber, oil leakage in the supercharger, and ultimately leads to serious faults such as valve erosion, post-processing erosion, and piston scuffing.

[0003] Although the engine manual requires that the idle time be ≤30 minutes, it is difficult to ensure that the idle time meets the requirements of the manual based on the actual usage needs of the driver. Therefore, the above risks can only be alleviated by optimizing the engine, such as by improving the material and structure of parts, but this also causes an increase in engine manufacturing costs and a waste of fuel.

[0004] There are methods for controlling long idle speed of engines in the prior art, such as the intelligent cylinder deactivation control strategy for long idle speed of engines disclosed in Chinese patent CN118793528A, an idle speed control method for engines disclosed in Chinese patent CN117341668A, and an automatic control method for idle shutdown of engines and engineering machinery disclosed in Chinese patent CN118564382A. The above-mentioned prior art only performs simple cylinder deactivation or shutdown for idle speed, and does not consider aspects such as idle time judgment, air conditioning temperature judgment, and speed increase, which makes it difficult to meet the requirements of generator power generation and air conditioning refrigeration, and the user's air conditioning use effect and vehicle experience are poor. Summary of the invention

[0005] The present invention provides a control method for improving the long idle adaptability of an engine, reducing the idle time, further improving the long idle adaptability of the engine, while ensuring electricity safety, meeting the user's air conditioning use needs, and improving the vehicle experience.

[0006] The present invention provides a control method for improving the long idle speed adaptability of an engine, comprising the following steps:

[0007] Step S1: Determine whether the vehicle is in the parking idle state. If so, proceed to the next step. If not, maintain the original state.

[0008] Step S2: Determine whether the idling time is too long, if yes, proceed to the next step, if no, keep the original state;

[0009] Step S3: temporarily increasing the engine speed; this step is used to remove incomplete combustion carbon deposits, alleviate the problem of oil leakage in the combustion chamber and the supercharger, and improve the engine's long idle speed adaptability;

[0010] Step S4: Determine whether to temporarily stop the machine. If yes, proceed to the next step. If no, keep the original state.

[0011] Step S5: temporary shutdown; this step is to reduce the idle time and further improve the engine's long idle adaptability;

[0012] Step S6 determines whether to restart the machine, if yes, proceed to the next step, if no, keep the original state;

[0013] Step S7: Restart the machine; this step is to drive the generator to generate electricity and the air conditioner to cool, to ensure electricity safety and the user's air conditioning needs and vehicle experience.

[0014] The present invention aims to solve the problem of the engine being in the idling air-conditioning state for a long time, and comprehensively considers the situations such as engine carbon deposits, battery power and air-conditioning use. It not only satisfies the problem of engine combustion carbon deposits, alleviates the problems of oil blowby in the combustion chamber and supercharger, and improves the engine's adaptability to long idling, but also ensures the power generation of the generator and the cooling of the air-conditioning, thus ensuring the safety of electricity use and the user's air-conditioning use needs and vehicle experience.

[0015] Preferably, the condition for determining that the vehicle is in parking idle in step S1 of the present invention is: vehicle speed = 0 and engine speed ≤ air conditioner idle. The method determines that the vehicle is stopped and the air conditioner is in idle cooling state.

[0016] Preferably, the condition for determining that the idle time is too long in step S2 of the present invention is: setting a continuous idle time limit T0, and the continuous idle time t≥T0. Setting this time is used to determine whether there is too much carbon deposit, which will cause damage to the engine, and then taking measures to clean up the carbon deposit.

[0017] Preferably, in step S3 of the present invention, the engine controller outputs a command to temporarily increase the speed, increase the fuel injection amount, increase the engine speed and maintain it for x minutes. In this step, if the idling time is too long, the engine controller outputs a command to temporarily increase the speed, increase the fuel injection amount, increase the speed and maintain it for x minutes, remove incomplete combustion carbon deposits, alleviate the problem of oil leakage in the combustion chamber and the supercharger, and improve the engine's long idle adaptability.

[0018] Preferably, the condition for determining temporary shutdown in step S4 of the present invention is: battery power ≥ saturated quantity and vehicle interior temperature ≤ first air conditioning target temperature. At this time, the air conditioning temperature is low, the air conditioning does not need to be cooled temporarily and can meet the passenger comfort requirements, and the battery power is sufficient to meet the requirements of the battery-driven air conditioning fan operation.

[0019] Preferably, in step S5 of the present invention, the engine controller outputs a temporary shutdown instruction, the fuel injector stops supplying fuel, the engine stops, and the battery drives the air conditioner fan to rotate. The fuel injector stops supplying fuel, the engine stops, and the battery provides energy to drive the air conditioner fan to rotate, thereby reducing the engine idling time, further improving the engine's long idling adaptability, and saving fuel.

[0020] Preferably, the condition for restarting in step S6 of the present invention is: battery power ≤ safety power or vehicle temperature ≥ second air conditioning target temperature. At this time, the battery power is low and it is difficult to meet the fan operation requirements, or the vehicle temperature is too high to meet the passenger comfort requirements.

[0021] Preferably, in step S7 of the present invention, the engine controller outputs an engine start instruction, the engine drives the generator to generate electricity for the battery, and the engine drives the air-conditioning compressor for cooling. Restarting the engine, driving the generator to generate electricity and the air-conditioning to cool, ensures electricity safety and the user's air-conditioning use needs and vehicle experience.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. If the idling time is too long, the controller will output a command to temporarily increase the speed, increase the fuel injection amount, increase the speed and maintain it for x minutes to remove carbon deposits from incomplete combustion, alleviate the problem of oil leakage in the combustion chamber and the supercharger, and improve the engine's adaptability to long idling.

[0024] 2. When the battery is fully charged and the temperature inside the car is low, the engine can be temporarily shut down. The controller outputs a temporary shutdown command, the injector stops supplying fuel, the engine stops, and the battery provides energy to drive the air-conditioning fan to rotate, reducing the idling time and further improving the engine's long idling adaptability.

[0025] 3. When the battery is low or the temperature inside the car rises, restart the engine to drive the generator to generate electricity and the air conditioner to cool, ensuring electricity safety and meeting the user's air conditioning needs and car experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The invention discloses a control logic diagram of a control method for improving the long idle speed adaptability of an engine.

[0027] Figure 2 It is a system block diagram of a control method for improving the long idle adaptability of an engine according to the present invention.

[0028] In the figure: 1-engine controller, 2-injector, air conditioning system 3, 4-engine speed sensor, 5-vehicle speed sensor, 6-battery power detection device, 7-in-vehicle temperature sensor. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0030] Embodiment 1:

[0031] like Figure 1 As shown, a method for improving the long idle adaptability control of an engine comprises the following steps:

[0032] Step S1: Determine whether the vehicle is in the parking idle state. If so, proceed to the next step. If not, maintain the original state.

[0033] Step S2: Determine whether the idling time is too long, if yes, proceed to the next step, if no, keep the original state;

[0034] Step S3: temporarily increasing the engine speed; this step is used to remove incomplete combustion carbon deposits, alleviate the problem of oil leakage in the combustion chamber and the supercharger, and improve the engine's long idle speed adaptability;

[0035] Step S4: Determine whether to temporarily stop the machine. If yes, proceed to the next step. If no, keep the original state.

[0036] Step S5: temporary shutdown; this step is to reduce the idle time and further improve the engine's long idle adaptability;

[0037] Step S6 determines whether to restart the machine, if yes, proceed to the next step, if no, keep the original state;

[0038] Step S7: Restart the machine; this step is to drive the generator to generate electricity and the air conditioner to cool, to ensure electricity safety and the user's air conditioning needs and vehicle experience.

[0039] Embodiment 2:

[0040] A control method for improving the adaptability of long idle speed of an engine, such as Figure 2 As shown, the following system is used for control, including an engine controller 1, an injector 2 and an air-conditioning system 3. The engine controller 1 is used to issue instructions to control the injection amount of the injector 2. The engine controller 1 is used to issue instructions to control the operation of the air-conditioning system 3. It also includes a variety of signal acquisition units connected to the engine controller 1, specifically an engine speed sensor 4 for acquiring engine speed, a vehicle speed sensor 5 for acquiring vehicle speed information, a battery power detection device 6 for acquiring battery power information, and an in-vehicle temperature sensor 7 for acquiring the in-vehicle temperature.

[0041] like Figure 1As shown, a control method for improving the adaptability of long idle speed of an engine described in the present invention includes step S1: judging whether the vehicle is in the parking idle state, if so, entering the next step, if not, maintaining the original state; the condition for judging that the vehicle is in the parking idle state is: vehicle speed = 0 and engine speed ≤ air conditioning idle speed. In this embodiment, air conditioning idle speed refers to the engine speed in the engine idle state when the air conditioning is started, and the air conditioning idle speed value is 650-850r / min. If the set speed is too low, the air conditioning power may be insufficient, and if it is too high, the engine running friction loss is high, the economy is poor, and the noise is also relatively large. The current air conditioning idle time is determined by the user's air conditioning demand time. Long-term idling may cause the aforementioned problems such as oil leakage, incomplete combustion, and excessive carbon deposits.

[0042] Step S2: Determine whether the idle time is too long. If so, proceed to the next step. If not, maintain the original state. The condition for determining that the idle time is too long is: set the continuous idle time limit T0, the continuous idle time t≥T0, and the T0 time in this embodiment is set to 30 minutes. This parameter is initially determined based on the balance level of the oil blowby capacity of each engine. The actual capacity of different engines is slightly different, and the setting may be different. If T0 is set too short, it may change frequently, the user experience is poor, and the air conditioning comfort is not good. If it is set too long, there will be the aforementioned problems such as carbon deposits and burning oil.

[0043] Step S3: temporarily increase the engine speed; the engine controller outputs a command to temporarily increase the speed, increase the fuel injection amount, increase the engine speed and maintain it for x minutes.

[0044] Step S4: Determine whether to temporarily shut down. If so, proceed to the next step. If not, maintain the original state. The conditions for determining temporary shutdown are: battery power ≥ saturated power, and the temperature inside the car ≤ the first air-conditioning target temperature. The value of the first air-conditioning target temperature is set by the user. For example, the customer of a family car adjusts the air-conditioning temperature by himself. In this scheme, the first air-conditioning target temperature is set 2°C below the customer's target temperature, that is, the first air-conditioning target temperature = customer target temperature - 2°C. If the customer's target temperature is set to 24°C, the first target temperature is set to 22°C. If the first air-conditioning target temperature setting deviates too much, it will cause a poor user experience and poor air-conditioning comfort. If the first air-conditioning target temperature deviates too little, the scheme will be frequently activated, the air-conditioning compressor will need to be frequently started, and the engine will also need to be frequently started, resulting in poor comfort.

[0045] Step S5: temporary shutdown; this step is to reduce the idle time and further improve the engine's long idle adaptability;

[0046] Step S6 determines whether to restart the machine. If yes, go to the next step. If no, keep the original state. The conditions for restarting the machine are: battery power ≤ safe power or vehicle temperature ≥ second air conditioning target temperature. The air conditioning target temperature is set by the user. For example, the customer of a family car adjusts the air conditioning temperature by himself. In this scheme, the second air conditioning target temperature is set about 2°C above the customer's target temperature, that is, the second air conditioning target temperature = customer target temperature + 2°C. If the customer's target temperature is set to 24°C, the second target temperature is set to 26°C. If the setting deviation is too large, the user experience is poor. If the deviation is too small, the scheme is frequently activated.

[0047] Step S7: Restart the engine; the engine controller outputs the command to start the engine, the engine drives the generator to generate electricity for the battery, and the engine drives the air conditioning compressor to cool. This refers to restoring the initial air conditioning idle speed, and the air conditioning idle speed value is 650-850r / min. If the set speed is too low, the air conditioning power may be insufficient. If it is too high, the engine running friction loss is high, the economy is poor, and the noise is also relatively loud. The current air conditioning idle time is determined by the user's air conditioning demand time. Long-term idling may cause the aforementioned problems such as oil leakage, incomplete combustion, and excessive carbon deposits.

Claims

1. A control method for improving the long idle speed adaptability of an engine, characterized in that The steps include: Step S1: Determine whether the vehicle is in the parking idle state. If so, proceed to the next step. If not, maintain the original state. Step S2: Determine whether the idling time is too long, if yes, proceed to the next step, if no, keep the original state; Step S3: temporarily increasing the engine speed; Step S4: Determine whether to temporarily stop the machine. If yes, proceed to the next step. If no, keep the original state. Step S5: temporary shutdown; Step S6 determines whether to restart the machine, if yes, proceed to the next step, if no, keep the original state; Step S7: Restart the computer.

2. A method for improving engine long idle adaptability control according to claim 1, characterized in that The condition for determining that the vehicle is in the parking idle speed in step S1 is: vehicle speed = 0 and engine speed ≤ air conditioning idle speed.

3. A control method for improving engine long idle adaptability according to claim 1, characterized in that The condition for determining that the idling time is too long in step S2 is: setting a continuous idling time limit T0, and the continuous idling time t≥T0.

4. A control method for improving engine long idle adaptability according to claim 1, characterized in that In step S3, the engine controller outputs a command to temporarily increase the speed, increase the fuel injection amount, increase the engine speed and maintain it for x minutes.

5. The method for improving the long idle speed adaptability of an engine according to claim 1, characterized in that The conditions for determining temporary shutdown in step S4 are: battery power ≥ saturated quantity and vehicle interior temperature ≤ first air conditioning target temperature.

6. A control method for improving engine long idle adaptability according to claim 1, characterized in that In step S5, the engine controller outputs a temporary shutdown command, the injector stops supplying fuel, the engine stops, and the battery drives the air conditioning fan to rotate.

7. A control method for improving engine long idle adaptability according to claim 1, characterized in that The conditions for determining whether to restart the system in step S6 are: battery power ≤ safety power or vehicle interior temperature ≥ second air conditioning target temperature.

8. A control method for improving engine long idle adaptability according to claim 1, characterized in that In step S7, the engine controller outputs an engine start command, the engine drives the generator to generate electricity for the battery, and the engine drives the air-conditioning compressor to cool.

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