Control strategy for automatically opening throttle valve during long-time continuous idling of diesel engine

Abstract

The invention relates to the technical field of diesel engine control, in particular to a control strategy for automatically opening a throttle valve during long-time continuous idling of a diesel engine. Judging whether the diesel engine is in an idling state or not based on a preset idling rotating speed range and the current rotating speed of the diesel engine; if the diesel engine is in the idling state, the continuous idling running time of the diesel engine is recorded; and if the continuous idling running time is larger than the preset continuous idling time threshold value, a throttle valve is controlled to be fully opened through a diesel engine control unit. By monitoring the continuous idling running time of the engine, when the continuous idling running time exceeds a certain time threshold value, the throttle valve is actively controlled to be opened, the air inlet positive pressure is maintained, the situation that air inlet negative pressure is formed in an air cylinder due to the fact that the throttle valve is closed during continuous long-time idling is avoided, engine oil channeling is reduced, and engine oil consumption of the engine is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of diesel engine control, and in particular to a control strategy for automatically opening a throttle when a diesel engine is idle for a long period of time. Background Art

[0002] A diesel engine is an internal combustion engine that uses diesel as fuel. It is widely used in vehicles, ships, industrial equipment, etc. Its working principle is to increase the temperature by compressing air, then spray diesel into it, and use the self-ignition characteristics of diesel to generate power. Diesel engines are usually characterized by high efficiency, durability and high torque; idling refers to the state of the engine running without loading (such as not accelerating or towing a load). At this time, the engine speed is relatively low and remains within the idle speed range set by the manufacturer. The idle state is often used when the vehicle is parked to keep the engine running to provide power or maintain the normal operation of equipment such as air conditioners.

[0003] When the engine is running at idle speed, opening the throttle to cut off the flow will increase the engine exhaust temperature, which will also reduce the exhaust flow and reduce the energy carried away by the exhaust to prevent the after-treatment temperature from being too low. However, opening the throttle to cut off the flow at idle speed will form an intake negative pressure behind the throttle, which can easily cause the oil to surge and lead to a high oil level fault in the engine. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a control strategy for automatically opening the throttle when a diesel engine is idling continuously for a long time.

[0005] The technical solution adopted to solve the above technical problems is: a control strategy for automatically opening the throttle when the diesel engine is idling for a long time, including:

[0006] Acquiring a current speed of the diesel engine based on a speed sensor, and determining whether the diesel engine is in an idle state based on a preset idle speed range and the current speed of the diesel engine;

[0007] If the diesel engine is in an idling state, then the continuous idling time of the diesel engine is recorded;

[0008] If the continuous idling time is greater than a preset continuous idling time threshold, the diesel engine control unit controls the throttle to be fully opened;

[0009] Determining whether the variation range of the operating state of the diesel engine is within a preset range, if the variation range of the operating state of the diesel engine is within the preset range, the diesel engine operates according to the electronic control setting parameters;

[0010] If the variation range of the operating state of the diesel engine is not within the preset range, the throttle valve is continuously controlled to be fully opened through the diesel engine control unit until the variation range of the operating state of the diesel engine is within the preset range.

[0011] Preferably, judging whether the diesel engine is in an idle state based on a preset idle speed range and a current speed of the diesel engine includes:

[0012] comparing the current speed of the diesel engine with a preset idle speed range;

[0013] If the current speed of the diesel engine is within a preset idle speed range, it is determined that the diesel engine is in an idle state;

[0014] If the current speed of the diesel engine exceeds a preset idle speed range, it is determined that the diesel engine is in a non-idle state.

[0015] Preferably, if the diesel engine is in an idling state, the continuous idling time of the diesel engine is recorded, including:

[0016] If it is detected that the diesel engine is in an idling state and the timer is not started, the timer is initialized and the start time is recorded;

[0017] In each monitoring cycle, continuously determining whether the diesel engine is still in an idling state;

[0018] If the diesel engine is still in an idling state, calculating the difference between the current time and the start time, and updating the continuous idling operation time;

[0019] If the diesel engine leaves the idle state, the current continuous idle operation time is recorded and the timer is reset.

[0020] Preferably, if the continuous idling time is greater than a preset continuous idling time threshold, the throttle is fully opened by controlling the diesel engine control unit, including:

[0021] Continuously monitoring the recorded continuous idle operation time, and comparing the continuous idle operation time with a preset continuous idle time threshold;

[0022] If the continuous idle operation time is greater than a preset continuous idle time threshold, a signal is sent to a diesel engine control unit, and the diesel engine control unit generates a control instruction, and the throttle is fully opened based on the control instruction;

[0023] If the continuous idling operation time is not greater than a preset continuous idling time threshold, the current state of the diesel engine is maintained.

[0024] Preferably, the operating state of the diesel engine includes diesel engine speed, cyclic injection amount, throttle opening, oil temperature, coolant water temperature, vehicle speed and gear position.

[0025] The beneficial effects of the present invention are as follows: the present invention monitors the continuous idling time of the engine. When the continuous idling time exceeds a certain time threshold, the throttle valve is actively controlled to open to maintain the positive intake pressure, thereby avoiding the formation of negative intake pressure in the cylinder due to closing the throttle valve during continuous idling for a long time, reducing oil surge and reducing engine oil consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic flow chart of the steps of an overall method in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] Embodiment 1, as Figure 1 As shown, the present invention proposes a control strategy for automatically opening the throttle when a diesel engine is idling for a long time, comprising:

[0028] S1. obtaining the current speed of the diesel engine based on the speed sensor, and determining whether the diesel engine is in an idle state based on a preset idle speed range and the current speed of the diesel engine;

[0029] S2. If the diesel engine is in an idling state, the continuous idling time of the diesel engine is recorded;

[0030] S3, if the continuous idling time is greater than a preset continuous idling time threshold, the diesel engine control unit controls the throttle to be fully opened;

[0031] S4, judging whether the variation range of the running state of the diesel engine is within a preset range, if the variation range of the running state of the diesel engine is within the preset range, the diesel engine operates according to the electronic control setting parameters;

[0032] S5. If the variation range of the operating state of the diesel engine is not within the preset range, the diesel engine control unit continues to control the throttle valve to be fully opened until the variation range of the operating state of the diesel engine is within the preset range.

[0033] In the present invention, the speed sensor is a device used to measure the engine speed, usually by monitoring the rotation of the crankshaft or flywheel to obtain real-time speed information; the diesel engine control unit refers to an electronic control system responsible for controlling and managing various functions of the diesel engine to ensure that it operates according to predetermined parameters.

[0034] Embodiment 2, the present invention proposes a control strategy for automatically opening the throttle when a diesel engine is idling for a long time. Compared with embodiment 1, this embodiment further includes: judging whether the diesel engine is in an idle state based on a preset idle speed range and the current speed of the diesel engine, including:

[0035] A1. Compare the current speed of the diesel engine with a preset idle speed range;

[0036] A2. If the current speed of the diesel engine is within the preset idle speed range, it is determined that the diesel engine is in an idle state;

[0037] A3. If the current speed of the diesel engine exceeds the preset idle speed range, it is determined that the diesel engine is in a non-idle state.

[0038] In an optional embodiment, if the diesel engine is in an idling state, the continuous idling time of the diesel engine is recorded, including:

[0039] B1. If it is detected that the diesel engine is in an idling state and the timer is not started, the timer is initialized and the start time is recorded;

[0040] B2. During each monitoring cycle, continuously determine whether the diesel engine is still in the idling state;

[0041] B3. If the diesel engine is still in the idling state, calculate the difference between the current time and the start time, and update the continuous idling time;

[0042] B4. If the diesel engine leaves the idle state, the current continuous idle operation time is recorded and the timer is reset.

[0043] It should be noted that a timer refers to a device or software module used to track time, which can start timing and record time when a specific event occurs; a monitoring cycle refers to the time interval for status detection, during which the engine status is evaluated and recorded; and leaving the idle state means that the engine is no longer in the idle state, which may be because the speed has increased to a non-idle level, which usually affects fuel supply and emission control.

[0044] In an optional embodiment, if the continuous idling time is greater than a preset continuous idling time threshold, the diesel engine control unit controls the throttle to be fully opened, including:

[0045] C1. Continuously monitor the recorded continuous idling time and compare the continuous idling time with a preset continuous idling time threshold;

[0046] C2. If the continuous idling time is greater than a preset continuous idling time threshold, a signal is sent to the diesel engine control unit, and the diesel engine control unit generates a control instruction, and the throttle is fully opened based on the control instruction;

[0047] C3. If the continuous idling time is not greater than the preset continuous idling time threshold, the current state of the diesel engine is maintained.

[0048] It should be noted that the control instruction refers to the command generated by the control unit, which is used to adjust the operating state or parameters of the engine, such as changing the throttle opening; full throttle refers to the state where the throttle is fully open, allowing maximum air to enter the engine to increase power and torque, and is usually used to improve the response speed of the engine.

[0049] In an optional embodiment, the operating state of the diesel engine includes the diesel engine speed, cyclic injection amount, throttle opening, oil temperature, coolant water temperature, vehicle speed and gear position.

[0050] It should be noted that the cycle injection volume refers to the amount of fuel injected in one engine cycle, usually measured in milliliters or grams, which directly affects the engine's combustion efficiency and power.

[0051] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A control strategy for automatically opening the throttle when a diesel engine is idling for a long time, characterized in that: include: Acquiring a current speed of the diesel engine based on a speed sensor, and determining whether the diesel engine is in an idle state based on a preset idle speed range and the current speed of the diesel engine; If the diesel engine is in an idling state, then the continuous idling time of the diesel engine is recorded; If the continuous idling time is greater than a preset continuous idling time threshold, the diesel engine control unit controls the throttle to be fully opened; Determining whether the variation range of the operating state of the diesel engine is within a preset range, if the variation range of the operating state of the diesel engine is within the preset range, the diesel engine operates according to the electronic control setting parameters; If the variation range of the operating state of the diesel engine is not within the preset range, the throttle valve is continuously controlled to be fully opened through the diesel engine control unit until the variation range of the operating state of the diesel engine is within the preset range.

2. A control strategy for automatically opening the throttle when a diesel engine is idling for a long time according to claim 1, characterized in that: Determining whether the diesel engine is in an idle state based on a preset idle speed range and a current speed of the diesel engine includes: comparing the current speed of the diesel engine with a preset idle speed range; If the current speed of the diesel engine is within a preset idle speed range, it is determined that the diesel engine is in an idle state; If the current speed of the diesel engine exceeds the preset idle speed range, it is determined that the diesel engine is in a non-idle state.

3. A control strategy for automatically opening the throttle when a diesel engine is idling for a long time according to claim 2, characterized in that: If the diesel engine is in an idling state, the continuous idling time of the diesel engine is recorded, including: If it is detected that the diesel engine is in an idling state and the timer is not started, the timer is initialized and the start time is recorded; In each monitoring cycle, continuously determining whether the diesel engine is still in an idling state; If the diesel engine is still in an idling state, calculating the difference between the current time and the start time, and updating the continuous idling operation time; If the diesel engine leaves the idle state, the current continuous idle operation time is recorded and the timer is reset.

4. The control strategy for automatically opening the throttle when a diesel engine is idling for a long time according to claim 1, characterized in that: If the continuous idling time is greater than a preset continuous idling time threshold, the diesel engine control unit controls the throttle to be fully opened, including: Continuously monitoring the recorded continuous idle operation time, and comparing the continuous idle operation time with a preset continuous idle time threshold; If the continuous idle operation time is greater than a preset continuous idle time threshold, a signal is sent to a diesel engine control unit, and the diesel engine control unit generates a control instruction, and the throttle is fully opened based on the control instruction; If the continuous idling operation time is not greater than a preset continuous idling time threshold, the current state of the diesel engine is maintained.

5. The control strategy for automatically opening the throttle when a diesel engine is idling for a long time according to claim 1, characterized in that: The operating state of the diesel engine includes the diesel engine speed, cyclic injection amount, throttle opening, oil temperature, coolant water temperature, vehicle speed and gear position.

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