Electric control engine control method for power station

Abstract

The invention relates to an electronic control engine control method for a power station, and relates to the technical field of engines. The maximum oil quantity is set according to the atmospheric pressure and the engine rotating speed; controlling the fuel injection quantity of the engine according to the maximum fuel quantity; and repeating the steps until the rotating speed of the engine reaches the rated rotating speed. By means of the control method, the electric control engine for the power station can rapidly reach the rated rotating speed from the idle speed at different altitudes. In addition, the original performance of the electric control diesel power station adopting the method is not affected.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a control method for an electronically controlled engine for a power station. Background Art

[0002] For power station engines, the engine needs to increase from idle speed to the rated speed before it can work normally. During this process, as the engine increases the amount of oil, the speed gradually increases until it reaches the required rated speed. In order to quickly reach the required rated speed, the actual injection amount controlled by the electronic control unit will increase rapidly until it reaches the smoke limit oil amount controlled by the intake pressure.

[0003] In plain areas, the intake pressure is relatively high and the intake volume is sufficient at idle. When the fuel injection amount increases, the engine speed can quickly rise to the required rated speed. At this time, the fuel injection amount calculated by the electronic control unit is usually far from the smoke limit.

[0004] At high altitudes, the atmospheric pressure is lower, and the intake pressure is also lower. When the speed increases from idle, due to insufficient intake volume, although the fuel injection volume increases rapidly, the speed increases slowly. At this time, the fuel injection volume calculated by the electronic control unit continues to increase to the smoke limit fuel volume. Excessive fuel and insufficient intake volume will lead to more incomplete combustion, the engine will continue to emit black smoke, and the engine will stay at a certain intermediate speed for a long time and cannot reach the speed required for normal operation.

[0005] At this time, if the smoke limit oil quantity is reduced, the air and fuel are mixed better due to the reduction in the injection oil quantity, and the rated speed can be reached quickly. However, after reducing the smoke limit oil quantity, when the performance test of the power station engine is carried out, such as the sudden increase test, the speed recovery time will be longer due to the reduction in the smoke limit oil quantity, and the dynamic response performance will be poor, which cannot meet the use requirements of the power station diesel engine. In addition, due to the higher the altitude, the greater the reduction in the smoke limit oil quantity, the worse the dynamic response of the engine will be, causing the high-power engine to only meet the requirements of low-power loading. Summary of the invention

[0006] The purpose of the present invention is to meet the normal oil volume demand of the electronically controlled engine for power stations when idling and accelerating to high speed at different altitudes, while not affecting the original engine performance.

[0007] In order to achieve the above object, the technical solution of the present invention provides a method for controlling an electronically controlled engine for a power station, comprising the following steps:

[0008] Get the current atmospheric pressure and engine speed;

[0009] Set the maximum fuel quantity according to the atmospheric pressure and engine speed;

[0010] Control the fuel injection amount of the engine according to the maximum fuel amount;

[0011] Repeat the above steps until the engine speed reaches the rated speed.

[0012] Preferably, when the engine speed reaches the rated speed, the oil quantity limitation under normal working conditions is adopted.

[0013] Preferably, the electronic control unit of the engine is provided with a control switch, and whether to start the control method is determined according to the control switch.

[0014] Preferably, at the same atmospheric pressure, the set maximum oil volume increases with the increase of the rotational speed; at the same rotational speed, the set maximum oil volume decreases with the increase of the atmospheric pressure.

[0015] Preferably, the atmospheric pressure and engine speed set the maximum fuel quantity according to the following table:

[0016]

[0018] The beneficial effect of the present invention is that the control method of the present invention can enable the electronically controlled engine for power stations to quickly reach the rated speed from idle speed at different altitudes. In addition, the original performance of the electronically controlled diesel power station using the method will not be affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a system to which the present invention is applied;

[0020] Figure 2 This is the maximum oil quantity control table. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The electronic control unit of an electronically controlled engine is usually equipped with an atmospheric pressure sensor, while the engine itself is equipped with an intake pressure sensor. When the engine is stationary and not started, the atmospheric pressure and intake pressure detected by the electronic control unit are roughly equal. When the engine is started and enters the idle state, the intake pressure will slightly exceed the atmospheric pressure. In the process of increasing from idle speed to rated speed, since the engine is in a no-load state, the intake pressure is still slightly higher than the pressure at idle speed.

[0023] In plain areas, due to the high atmospheric pressure, the intake pressure is also high, so the intake volume is sufficient at idle. With the rapid increase in the injection volume, the engine speed can be quickly increased to the required rated speed, and the actual injection volume usually does not reach the set smoke limit oil volume. However, in high-altitude areas, due to the low atmospheric pressure, the intake pressure also decreases (when the engine is stationary, the intake pressure is the same as the atmospheric pressure). The intake volume is insufficient at idle. When the speed needs to be increased to the rated speed, due to the insufficient intake volume, even if the injection volume increases rapidly, the combustion is not sufficient, resulting in the speed not being able to rise quickly. The injection volume calculated by the electronic control unit will continue to increase until it reaches the maximum smoke limit oil volume, and excessive fuel and insufficient intake volume will lead to more incomplete combustion, causing the engine to continue to emit black smoke, and may even stay at a certain intermediate speed for a long time, unable to reach the speed required for normal operation. In this case, if the smoke limit oil volume under the no-load intake pressure is reduced, the air and fuel mixture ratio will be improved due to the reduction in oil volume, so that the engine can quickly reach the required rated speed. However, as the reduction in smoke-limited fuel volume increases, the dynamic response performance of the engine will also deteriorate, resulting in a high-power engine being able to adapt to low-power load requirements.

[0024] The embodiment of the present invention discloses a control method for an electronically controlled engine for a power station. In order to meet the special needs of the power station engine, the electronic control unit is designed with a control switch specifically used to control the engine to increase speed, and a new control method is adopted to limit the maximum oil volume during the process from idle speed to rated speed. The method is no longer based on the intake pressure, but controls the oil volume based on the atmospheric pressure. The specific steps are as follows:

[0025] 1. Switch activation: A special control switch for power station engine high speed is preset in the electronic control unit. When the engine needs to be controlled, activate the control switch to start the control method.

[0026] 2. Maximum fuel quantity limitation: Once the control switch is activated, the maximum fuel quantity of the engine will be limited by the control method during the acceleration process from idle to rated speed.

[0027] 3. Signal acquisition: The electronic control unit will obtain the effective signal of the engine, the real-time speed signal, the atmospheric pressure signal and the target speed signal in real time. When the engine is in the idle state, if the target speed is set to the idle speed, the control method will take effect.

[0028] 4. Fuel volume control: When the engine receives the instruction to adjust the target speed from idle to rated speed, the speed starts to increase. During this process, the electronic control unit determines the maximum fuel volume limit at different speeds based on the current atmospheric pressure.

[0029] 5. Completion of speed increase: When the engine speed reaches the preset rated speed, the system determines that the speed increase process has been completed and the engine enters normal working state. At this time, the control method is exited and the maximum fuel limit set by the original system is used instead.

[0030] 6. Return to idle: When the engine needs to return to idle, the target speed will be adjusted from the rated speed back to idle. After the speed drops back to idle, the control method is reactivated and the maximum fuel volume during the speed increase is limited again.

[0031] The ECU is connected to an atmospheric pressure sensor, an intake pressure sensor and a speed sensor to transmit relevant signals in real time. The system and ECU can dynamically adjust the oil demand in the speed range according to actual needs. After the power station engine is started, the speed gradually increases from idle speed to rated speed to ensure smooth operation of the engine.

[0032] In order to meet the high sudden transient performance requirements of the electronically controlled power station engine, the system usually requires a larger maximum oil limit at the rated speed and the speed range close to the rated speed. At the same time, during the speed increase process, considering the influence of the smoke limit, the oil volume will also be subject to certain control. After the power station engine is started, the engine is usually in a no-load state during the transition stage from idle to rated speed, except for the necessary accessory loads (such as fans). At this time, the change in intake pressure is small, and the system ensures a stable speed increase by controlling the maximum oil volume. Due to the high requirements of the electronically controlled power station engine for sudden transient performance, the system is designed with a larger oil limit to meet this performance requirement, but this oil volume will be regulated by the smoke limit.

[0033] This control method is mainly enabled through a dedicated power station mode control switch, ensuring that the maximum fuel limit from idle to rated speed is determined by the system table, which pre-sets the maximum fuel limit under different atmospheric pressures and speeds. When the engine speed reaches the rated speed, the control method exits and the fuel limit under normal working conditions is adopted. If the speed is adjusted from idle to rated speed again, the control method will take effect again. This control method ensures the stable operation of the power station engine during the speed increase from idle to rated speed by dynamically adjusting the fuel volume according to the changes in atmospheric pressure and speed, and effectively avoids the risks caused by over-injection.

[0034] In order to achieve precise fuel quantity control, the electronically controlled engine is equipped with an atmospheric pressure sensor (usually built into the electronic control unit), an intake pressure sensor, and a speed sensor. The electronic control unit receives information such as atmospheric pressure, current speed, and target speed, and performs fuel quantity control based on this data.

[0035] When the engine starts and enters normal working state, the speed will increase from zero to idle speed. When the engine reaches the idle speed, the target speed is consistent with the current speed, and this control method starts to take effect, and the fuel volume is controlled in real time. When the electronic control unit receives the instruction to adjust the target speed from idle speed to rated speed, the electronic control unit will increase the fuel injection amount, so that the engine speed gradually increases. During this speed increase process, the electronic control unit controls the maximum fuel injection amount at different speeds according to the current speed and atmospheric pressure (see Figure 2 ). This oil quantity control is realized by the preset maximum oil quantity control table. The vertical axis of the table represents different atmospheric pressures (corresponding to different altitudes), and the horizontal axis represents the various speed groups from idle to rated speed. Each cell in the table records the maximum oil quantity allowed under specific atmospheric pressure and speed conditions.

[0036] When the ECU detects that the engine speed reaches the predetermined rated speed, the system will immediately exit this control method. At this point, the engine enters normal working state, and the oil quantity limit will be controlled by the original setting conditions of the ECU. If the engine speed drops from the rated speed to the idle speed, the ECU will restart the speed increase control method. When the target speed is adjusted from the idle speed to the rated speed again, the maximum oil quantity control will take effect again. Through this control method, the ECU can accurately adjust the maximum oil quantity during the engine speed increase process according to the changes in speed and atmospheric pressure, ensuring a smooth transition of the engine and improving operating efficiency.

[0037] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A control method for an electronically controlled engine for a power station, characterized in that: The following steps are involved: Get the current atmospheric pressure and engine speed; Set the maximum fuel quantity according to the atmospheric pressure and engine speed; Control the fuel injection amount of the engine according to the maximum fuel amount; Repeat the above steps until the engine speed reaches the rated speed.

2. A control method for an electronically controlled engine for a power station according to claim 1, characterized in that: When the engine speed reaches the rated speed, the oil quantity limit under normal working conditions is adopted.

3. The method for controlling an electronically controlled engine for a power station according to claim 1, characterized in that: The electronic control unit of the engine is provided with a control switch, and whether to start the control method is determined according to the control switch.

4. The method for controlling an electronically controlled engine for a power station according to claim 1, characterized in that: Under the same atmospheric pressure, the set maximum oil volume increases with the increase of speed; under the same speed, the set maximum oil volume decreases with the increase of atmospheric pressure.

5. The method for controlling an electronically controlled engine for a power station according to claim 4, characterized in that: Atmospheric pressure and engine speed set the maximum oil quantity according to the following table:

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