Diesel engine power limiting method and device based on air filter resistance

Abstract

The invention provides a diesel engine power limiting method and device based on air filter resistance, and the method comprises the following steps: starting a diesel engine, entering a basic operation condition, and outputting a basic fuel injection quantity; detecting an air filter resistance value, a diesel engine operation rotating speed value and an accelerator position value in real time; inquiring an oil quantity limiting coefficient from a preset mapping relation; and the fuel injection quantity is dynamically adjusted. The device comprises an air resistance detection control unit and an oil injection actuator. The air resistance detection control unit comprises an air filter resistance sensor, a diesel engine rotating speed sensor, an accelerator position sensor, an amplifying and shaping circuit module, an AD conversion circuit module and an ECU. Through closed-loop control of resistance monitoring, coefficient query and oil quantity adjustment, state parameters of resistance of the air filter are converted into power control signals. The method has the beneficial effects that air filter breakdown and engine damage are avoided, combustion deterioration is prevented, the reliability of an extreme environment is improved, maintenance reminding is provided, and misjudgment is reduced.

Description

Technical Field

[0001] This invention belongs to the field of diesel engine technology, and in particular relates to a method and apparatus for limiting diesel engine power based on air filter resistance. Background Technology

[0002] Specialized vehicles used in extreme environments such as deserts and areas with frequent sandstorms commonly experience air filter clogging, which can severely damage the diesel engine by causing the air filter to burst. To ensure the air filter is functioning properly, the primary method is to use the vehicle's dashboard to detect air filter clogging based on intake negative pressure and perform maintenance accordingly. This method can protect the air filter to some extent. However, during continuous high-speed driving, if an air filter clogging alarm suddenly appears, it's difficult to immediately stop and clean the air filter. At this time, due to the high power and intake air demand of the diesel engine, continued operation can easily cause the air filter to burst within a short period, leading to damage. In severe cases, foreign objects can enter the diesel engine cylinders, causing fatal malfunctions. This problem is particularly pronounced in desert regions. Summary of the Invention

[0003] In view of this, the present invention aims to propose a diesel engine power limiting method and apparatus based on air filter resistance, so as to solve the problem in the prior art that the air filter breaks down and damages the diesel engine due to air filter blockage.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows: In a first aspect, the present invention provides a diesel engine power limiting method based on air filter resistance, comprising the following steps: S1. The diesel engine starts and enters the basic operating condition, outputting the basic fuel injection quantity; S2. Using the air resistance detection and control unit, the air filter resistance value, diesel engine operating speed value and throttle position value are detected in real time. S3. Based on the air filter resistance value and the diesel engine operating speed value, query the fuel quantity limit coefficient from the preset mapping relationship; S4. Based on the fuel quantity limit coefficient and throttle position value, the fuel injection quantity is dynamically adjusted using the fuel injection actuator.

[0005] Furthermore, in step S1, the diesel engine starts, enters the basic operating condition, and outputs the basic fuel injection quantity, including: Based on conventional PID control logic, the basic fuel injection quantity is output.

[0006] Furthermore, the air resistance detection control unit is used to monitor the air filter resistance value, diesel engine operating speed value, and throttle position value in real time, including: The air filter resistance signal is obtained using an air filter resistance sensor. The diesel engine operating speed signal is obtained using a diesel engine speed sensor; The throttle position signal is obtained using a throttle position sensor; The amplification and shaping circuit module processes the air filter resistance signal, diesel engine speed signal, and throttle position signal respectively to obtain digital and analog signals. The digital signal is then output to the ECU, and the analog signal is output to the AD conversion circuit module. The analog-to-digital conversion is performed using an AD conversion circuit module, and the conversion result is output to the ECU. Based on digital signals and analog-to-digital conversion results, the ECU calculates the air filter resistance value, diesel engine operating speed value, and throttle position value.

[0007] Furthermore, in step S3, the oil quantity limit coefficient is queried from the preset mapping relationship, including: Based on the mapping relationship between resistance, speed, and fuel quantity coefficient, the fuel quantity limit coefficient is obtained by querying or interpolation.

[0008] Furthermore, in step S4, based on the fuel quantity limit coefficient and throttle position value, the fuel injection quantity is dynamically adjusted using the fuel injection actuator, including: The fuel injection quantity of the diesel engine is calculated based on the fuel quantity limitation coefficient. Based on the diesel engine's fuel injection quantity and throttle position, the ECU outputs a fuel injection quantity control signal to the fuel injection actuator. Based on the fuel injection quantity control signal, the fuel injection quantity of the diesel engine is adjusted using the fuel injection actuator.

[0009] Secondly, based on the same concept, the present invention also provides a diesel engine power limiting device based on air filter resistance, including an air resistance detection and control unit and a fuel injection actuator, wherein the air resistance detection and control unit is connected to the fuel injection actuator. The air resistance detection and control unit includes an air filter resistance sensor, a diesel engine speed sensor, a throttle position sensor, an amplification and shaping circuit module, an AD conversion circuit module, and an ECU; The air filter resistance sensor, diesel engine speed sensor, and throttle position sensor are all connected to the amplification and shaping circuit module, which is connected to the AD conversion circuit module, which is connected to the ECU, and the ECU is connected to the fuel injection actuator.

[0010] Compared with the prior art, the diesel engine power limiting method and device based on air filter resistance described in this invention have the following advantages: (1) By adjusting the diesel engine oil level according to the different degrees of blockage of the air filter, it is possible to effectively prevent the air filter from being punctured when it is severely blocked, allowing dust to enter the cylinder and causing engine damage such as cylinder scoring.

[0011] (2) By intervening before the intake resistance reaches a dangerous value, it can effectively avoid the phenomenon of poor combustion and black smoke caused by insufficient intake of diesel engine.

[0012] (3) For special vehicles used in dusty areas such as deserts, the vehicle can automatically adapt to harsh working conditions and automatically adjust the output when the air filter performance deteriorates, preventing accidental engine damage and greatly improving the reliability of operation under extreme environmental conditions.

[0013] (4) It can provide drivers with accurate air filter maintenance reminders. When the vehicle feels underpowered, the system can clearly indicate whether it is due to air filter blockage, reducing misjudgment and improving vehicle manageability and user experience. Attached Figure Description

[0014] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the overall process of the method described in an embodiment of the present invention; Figure 2 This is a schematic diagram of the overall architecture of the device described in an embodiment of the present invention. Detailed Implementation

[0015] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0016] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0017] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] like Figure 1 As shown, a diesel engine power limiting method based on air filter resistance is proposed. This method dynamically adjusts the diesel engine output power by real-time monitoring of the air filter resistance to protect the air filter and the diesel engine for safe operation in extreme environments. The details are as follows: A1. Basic Operation Start-up: After the diesel engine starts, it first enters the basic operation condition and outputs the basic fuel injection quantity according to the conventional PID control logic.

[0020] A2. Air filter clogging detection: Using an air filter resistance sensor, the negative pressure change of the intake system (i.e., the air filter resistance value) is detected in real time to determine the degree of clogging.

[0021] A3. Fuel Limit Coefficient Query: Based on the detected resistance value and the current operating speed of the diesel engine, the "maximum fuel limit coefficient" is retrieved from a preset mapping relationship. For example, when the resistance value reaches 10 kPa (calibrable), the coefficients corresponding to different speeds are as follows: 1 for 800 r / min, 1 for 1300 r / min, 0.9 for 1800 r / min, and 0.8 for 2300 r / min; if the speed is between the values ​​in the table (e.g., 1500 r / min), the coefficient is determined by interpolation. The mapping relationship is shown in the table below. A4. Dynamically Adjust Fuel Injection Quantity: Multiply the queried fuel quantity limit coefficient by the base fuel injection quantity to obtain the actual fuel injection quantity after the limit. For example, when the coefficient is 0.9, the fuel injection quantity is adjusted to 90% of the base maximum fuel quantity, thereby reducing intake air demand and preventing the air filter from being damaged due to excessive load.

[0022] like Figure 2 As shown, a diesel engine power limiting device based on air filter resistance is used to implement the aforementioned power limiting method. This device mainly consists of two parts: an air resistance detection and control unit and a fuel injection actuator, integrated into the diesel engine electronic control system. Its specific structure and functions are as follows: 1. Air resistance detection and control unit Sensor module: Includes an air filter resistance sensor, a diesel engine speed sensor, and a throttle position sensor, used to collect key operating parameters of the diesel engine. The air filter resistance sensor detects the air filter resistance value; the diesel engine speed sensor detects the real-time operating speed of the diesel engine; the throttle position sensor detects the throttle position to assist in judging the operating conditions.

[0023] Signal processing module: Includes amplification and shaping circuitry and an analog-to-digital converter (AD converter) to ensure stable and reliable signal processing. The amplification and shaping circuitry processes the sensor signal into a digital signal or transmits it to the AD converter, which converts the analog signal into a digital signal.

[0024] ECU: Receives the processed digital signal, compares and calculates it with the preset resistance-speed-fuel quantity coefficient mapping relationship, and outputs the fuel injection quantity control signal.

[0025] 2. Fuel injection actuator It consists of a rack and an electromagnetic coil. The rack is connected to a high-pressure fuel pump and adjusts the fuel supply by displacement. The electromagnetic coil receives the control signal from the controller and drives the rack to move, thereby precisely controlling the fuel injection quantity.

[0026] This method and device directly converts the air filter resistance, a state parameter, into a power control signal through closed-loop control of "resistance monitoring - coefficient query - oil quantity adjustment," realizing the transformation from "passive alarm" to "active prevention." It is especially suitable for special vehicles in dusty environments such as deserts, effectively avoiding fatal failures such as air filter breakdown and foreign objects entering the diesel engine cylinder, while optimizing operating efficiency.

[0027] Advantages and beneficial effects of the present invention: (1) By adjusting the diesel engine oil level according to the different degrees of blockage of the air filter, it is possible to effectively prevent the air filter from being punctured when it is severely blocked, allowing dust to enter the cylinder and causing engine damage such as cylinder scoring.

[0028] (2) By intervening before the intake resistance reaches a dangerous value, it can effectively avoid the phenomenon of poor combustion and black smoke caused by insufficient intake of diesel engine.

[0029] (3) For special vehicles used in dusty areas such as deserts, the vehicle can automatically adapt to harsh working conditions and automatically adjust the output when the air filter performance deteriorates, preventing accidental engine damage and greatly improving the reliability of operation under extreme environmental conditions.

[0030] (4) It can provide drivers with accurate air filter maintenance reminders. When the vehicle feels underpowered, the system can clearly indicate whether it is due to air filter blockage, reducing misjudgment and improving vehicle manageability and user experience.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A diesel engine power limiting method based on air filter resistance, characterized in that: Includes the following steps: S1. The diesel engine starts and enters the basic operating condition, outputting the basic fuel injection quantity; S2. Using the air resistance detection and control unit, the air filter resistance value, diesel engine operating speed value and throttle position value are detected in real time. S3. Based on the air filter resistance value and the diesel engine operating speed value, query the fuel quantity limit coefficient from the preset mapping relationship; S4. Based on the fuel quantity limit coefficient and throttle position value, the fuel injection quantity is dynamically adjusted using the fuel injection actuator.

2. The diesel engine power limiting method based on air filter resistance according to claim 1, characterized in that: In step S1, the diesel engine starts and enters the basic operating condition, outputting the basic fuel injection quantity, including: Based on conventional PID control logic, the basic fuel injection quantity is output.

3. The diesel engine power limiting method based on air filter resistance according to claim 1, characterized in that: The air resistance detection and control unit is used to monitor the air filter resistance, diesel engine speed, and throttle position in real time, including: The air filter resistance signal is obtained using an air filter resistance sensor. The diesel engine operating speed signal is obtained using a diesel engine speed sensor; The throttle position signal is obtained using a throttle position sensor; The amplification and shaping circuit module processes the air filter resistance signal, diesel engine speed signal, and throttle position signal respectively to obtain digital and analog signals. The digital signal is then output to the ECU, and the analog signal is output to the AD conversion circuit module. The analog-to-digital conversion is performed using an AD conversion circuit module, and the conversion result is output to the ECU. Based on digital signals and analog-to-digital conversion results, the ECU calculates the air filter resistance value, diesel engine operating speed value, and throttle position value.

4. The diesel engine power limiting method based on air filter resistance according to claim 1, characterized in that: In step S3, the oil quantity limit coefficient is queried from the preset mapping relationship, including: Based on the mapping relationship between resistance, speed, and fuel quantity coefficient, the fuel quantity limit coefficient is obtained by querying or interpolation.

5. The diesel engine power limiting method based on air filter resistance according to claim 1, characterized in that: In step S4, based on the fuel quantity limit coefficient and throttle position value, the fuel injection quantity is dynamically adjusted using the fuel injection actuator, including: The fuel injection quantity of the diesel engine is calculated based on the fuel quantity limitation coefficient. Based on the diesel engine's fuel injection quantity and throttle position, the ECU outputs a fuel injection quantity control signal to the fuel injection actuator. Based on the fuel injection quantity control signal, the fuel injection quantity of the diesel engine is adjusted using the fuel injection actuator.

6. A diesel engine power limiting device based on air filter resistance, applied to the diesel engine power limiting method based on air filter resistance as described in any one of claims 1-4, characterized in that: It includes an air resistance detection and control unit and a fuel injection actuator, wherein the air resistance detection and control unit is connected to the fuel injection actuator; The air resistance detection and control unit includes an air filter resistance sensor, a diesel engine speed sensor, a throttle position sensor, an amplification and shaping circuit module, an AD conversion circuit module, and an ECU; The air filter resistance sensor, diesel engine speed sensor, and throttle position sensor are all connected to the amplification and shaping circuit module, which is connected to the AD conversion circuit module, which is connected to the ECU, and the ECU is connected to the fuel injection actuator.

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