Method for improving jittering of diesel engine in flameout and shutdown processes
By using ECU module and electronic control unit module in the diesel engine to automatically identify the fire shutdown condition and control the valve body, the problem of shaking during the diesel engine is solved, and the effect of reducing shaking and harmful emissions is achieved.
Patent Information
- Application Number
- CN202411834480.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-03-14
AI Technical Summary
Diesel engines are prone to jitter during shutdown. The prior art mainly uses mechanical components to prevent jitter, which can easily damage the diesel engine.
The four subsystems of ECU module, electronic control unit module, valve body control module and post-processing module are adopted. By automatically identifying the diesel engine's fire extinguishing condition, the exhaust brake valve and the brake valve in the cylinder are issued to close, generating a large intake resistance to suppress and consume the rotational energy of the flywheel and reduce jitter.
Effectively suppress and absorb the jitter generated by the flywheel during the fire-off process, avoid damaging the diesel engine, and reduce the emission of harmful gases and particulate matter.
Smart Images
Figure CN119616682A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of diesel engine control, and in particular relates to a method for improving the vibration of a diesel engine during flameout and shutdown. Background Art
[0002] The diesel engine is a compression ignition diesel engine. During its operation, air is first sucked into the cylinder, and then the air is compressed through the compression stroke of the piston. When the compression stroke approaches the top dead center, the fuel injector sprays diesel into the cylinder. At this time, the high-temperature and high-pressure air causes the diesel to spontaneously ignite instantly. This combustion method is different from the spark plug ignition of a gasoline engine. The high-temperature and high-pressure gas generated by the combustion pushes the piston to do work, which in turn drives the crankshaft to rotate, and finally outputs power. It is widely used in heavy trucks, large buses, ships and other means of transportation.
[0003] If the intake pipe is damaged, leaking, or the air filter is clogged, the amount of air entering the cylinder will be unstable. During the flameout process, this unstable intake will cause the combustion ratio to be unbalanced, causing the diesel engine to shake. The traditional way to reduce the vibration is to prevent the vibration through mechanical parts, which is easy to damage the diesel 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 method for improving the vibration during the shutdown process of a diesel engine.
[0005] The technical solution adopted to solve the above technical problems is: a method for improving the jitter during the shutdown process of a diesel engine, including four subsystems: an ECU module, an electronic control unit module, a valve body control module, and a post-processing module. The ECU module is responsible for monitoring and identifying the data sent back by the sensor and sending corresponding operations to the electronic control unit module based on the data; the electronic control unit module is responsible for receiving data from the ECU module and controlling the valve body control module according to the data; the valve body control module is responsible for receiving the control of the electronic control unit module and controlling different valve body switches; the post-processing module is responsible for processing the exhaust gas discharged by the diesel engine.
[0006] Through the above technical solution, during the shutdown process, the electronic control unit automatically identifies the shutdown condition of the diesel engine, and issues a control command to the exhaust brake valve and the cylinder brake valve to close them, so that the diesel engine can generate a larger intake resistance during the shutdown process to suppress and consume the rotational energy of the flywheel, thereby suppressing and absorbing the jitter generated by the flywheel during the shutdown process to avoid damage to the diesel engine.
[0007] Further, the ECU module includes sensors, a data acquisition card, and an industrial computer. The sensors include a temperature sensor, a pressure sensor, a rotational speed sensor, a torque sensor, and an acceleration sensor, which are used to measure the temperature of various parts of the diesel engine, the intake pressure, the rotational speed of the diesel engine, the output torque of the diesel engine, and the vibration of the diesel engine. When the shutdown command is issued, the electronic control unit module is regulated according to the data transmitted back by the sensors.
[0008] Through the above technical solution, the state of the diesel engine can be monitored, thereby facilitating the control of the valve body control module.
[0009] Further, the electronic control unit module is responsible for receiving the data of the ECU module and controlling the valve body control module according to the data. The specific operation formula is as follows:
[0010] Exhaust brake intensity adjustment formula:
[0011] Let the opening time of the in-cylinder braking valve be t ib (unit: second), the vibration amplitude of the diesel engine is A (unit: m / s 2 , measured by the acceleration sensor installed on the cylinder block of the diesel engine), the reference vibration amplitude is A0 (set according to the vibration range during the normal operation of the diesel engine, and the specific value is 0.1 - 0.2 m / s 2 ), and the time adjustment coefficients are m1 and m2 (determined by the performance and experiments of the diesel engine);
[0012] When A > A0, t ib = t ib0 - m1(A - A0), where t ib0 is the initially set valve opening time. When the vibration amplitude of the diesel engine is greater than the reference amplitude, the valve opening time will decrease, and m1 determines the rate at which the valve opening time decreases with the increase in the vibration amplitude, reducing the in-cylinder braking intensity to reduce vibration;
[0013] When A < A0, t ib = t ib0 + m2(A0 - A). When the vibration amplitude of the diesel engine is less than the reference amplitude, the valve opening time will increase, and m2 controls the rate at which the valve opening time increases with the decrease in the vibration amplitude, appropriately enhancing the in-cylinder braking to consume the energy of the diesel engine faster.
[0014] Through the above technical solution.
[0015] Further, the throttle opening adjustment formula:
[0016] Let the intake pressure be P in (unit: kPa), the target intake pressure is P target (determined according to the stable intake pressure under different working conditions of the diesel engine), k θis the adjustment coefficient;
[0017] θ=k θ (P target -P in )
[0018] When the intake pressure is lower than the target intake pressure, the throttle opening will increase to allow more air to enter the diesel engine, thereby adjusting the intake volume of the diesel engine to control the rate of decrease of the diesel engine speed and reduce jitter.
[0019] Further, the exhaust brake valve adjustment formula is:
[0020] Assume that the exhaust brake valve opening V is, and the diesel engine vibration amplitude is A (in meters per second 2 , measured by the acceleration sensor installed on the diesel engine cylinder block), the diesel engine speed is n, the reference jitter amplitude is A0 (set according to the jitter range during normal operation of the diesel engine), and the speed weight coefficient is ω n , the jitter amplitude weight coefficient is ω A , the adjustment coefficient is k;
[0021] V = k[ω n (nn t )+ω A (A-A0)]
[0022] When the diesel engine vibrates greatly and the speed is higher than the target speed, the exhaust brake valve opening will increase accordingly to better control the diesel engine shutdown process and reduce vibration.
[0023] Furthermore, the valve body control module includes a throttle, an in-cylinder brake valve and an exhaust brake valve.
[0024] Furthermore, the post-treatment module includes an oxidation catalyst, a particulate filter, and a selective catalytic reduction system, which are used to oxidize carbon monoxide and hydrocarbons in the diesel engine exhaust. During the diesel engine shutdown process, these pollutants in the exhaust gas will still be produced. The precious metal catalyst inside the oxidation catalyst can promote the reaction of carbon monoxide and hydrocarbons with oxygen, converting them into carbon dioxide and water.
[0025] Through the above technical solution, not only the emission of harmful gases is reduced, but also the accumulation of incompletely burned hydrocarbons in the exhaust system can be prevented, thus avoiding the subsequent vibration caused by combustion.
[0026] Furthermore, the particulate filter is responsible for capturing particulate matter in diesel engine exhaust, mainly soot. During the diesel engine shutdown process, the particulate matter content in the exhaust gas increases due to incomplete combustion. The porous wall structure of the particulate filter filters these particulate matter and prevents them from being discharged into the atmosphere.
[0027] The above technical solution can prevent particulate matter from clogging the diesel engine outlet and affecting the diesel engine performance.
[0028] Further, the following steps are included:
[0029] Step 1: The ECU module sends a shutdown command to the electronic control unit module, and the electronic control unit module controls the diesel engine to shut down;
[0030] Step 2: The diesel engine vibration, speed and pressure data in the engine pipeline when the engine is turned off are collected by the sensors on the diesel engine and transmitted back to the ECU module;
[0031] Step 3: The ECU module sends instructions to the electronic control unit module according to the data sent back, and the electronic control unit module controls the valve body control module to adjust, and reduces the vibration of the diesel engine during the shutdown process through pneumatic braking;
[0032] Step 4: Treat the exhaust gas during the operation of the diesel engine through the post-processing module.
[0033] The beneficial effects of the present invention are as follows: during the flameout process, the ECU module and the electronic control unit of the present invention automatically identify the flameout condition of the diesel engine, thereby issuing control instructions to the throttle valve, the exhaust brake valve and the cylinder brake valve to control their opening and closing, so that the diesel engine can generate a larger intake resistance during the flameout process to suppress and consume the rotational energy of the flywheel, thereby suppressing and absorbing the jitter generated by the flywheel during the flameout process to avoid damage to the diesel engine. BRIEF DESCRIPTION OF THE DRAWINGS
[0034] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION
[0035] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0036] like Figure 1 As shown, a method for improving the jitter during the shutdown process of a diesel engine in this embodiment includes four subsystems: an ECU module, an electronic control unit module, a valve body control module, and a post-processing module. The ECU module is responsible for monitoring and identifying the data sent back by the sensor and sending corresponding operations to the electronic control unit module according to the data; the electronic control unit module is responsible for receiving the data from the ECU module and controlling the valve body control module according to the data; the valve body control module is responsible for receiving the control of the electronic control unit module and controlling different valve body switches; the post-processing module is responsible for processing the exhaust gas discharged by the diesel engine.
[0037] The ECU module includes sensors, a data acquisition card, and an industrial computer. The sensors include a temperature sensor, a pressure sensor, a rotational speed sensor, a torque sensor, and an acceleration sensor, which are used to measure the temperature of various parts of the diesel engine, the intake pressure, the rotational speed of the diesel engine, the output torque of the diesel engine, and the vibration of the diesel engine. When an engine shutdown command is issued, the electronic control unit module is regulated according to the data transmitted back by the sensors.
[0038] The electronic control unit module is responsible for receiving the data from the ECU module and controlling the valve body control module according to the data. The specific operation formula is as follows:
[0039] Exhaust brake intensity adjustment formula:
[0040] Let the opening time of the in-cylinder brake valve be t ib (unit: second), the vibration amplitude of the diesel engine be A (unit: m / s 2 , measured by the acceleration sensor installed on the diesel engine block), the reference vibration amplitude be A0 (set according to the vibration range during the normal operation of the diesel engine, and the specific value is 0.1 - 0.2 m / s 2 ), and the time adjustment coefficients be m1 and m2 (determined by the performance and experiments of the diesel engine);
[0041] When A > A0, t ib = t ib0 - m1(A - A0), where t ib0 is the initially set valve opening time. When the vibration amplitude of the diesel engine is greater than the reference amplitude, the valve opening time will decrease. m1 determines the rate at which the valve opening time decreases as the vibration amplitude increases, reducing the in-cylinder brake intensity to reduce vibration;
[0042] When A < A0, t ib = t ib0 + m2(A0 - A). When the vibration amplitude of the diesel engine is less than the reference amplitude, the valve opening time will increase. m2 controls the rate at which the valve opening time increases as the vibration amplitude decreases, appropriately enhancing the in-cylinder brake to more quickly consume the energy of the diesel engine.
[0043] Let the intake pressure be P in (unit: kPa), the target intake pressure be P target (determined according to the stable intake pressure under different operating conditions of the diesel engine), and k θ be the adjustment coefficient;
[0044] θ = k θ (P target - P in )
[0045] When the intake pressure is lower than the target intake pressure, the throttle opening will increase to allow more air to enter the diesel engine, thereby adjusting the intake volume of the diesel engine to control the rate of decrease of the diesel engine speed and reduce jitter.
[0046] Exhaust brake valve adjustment formula:
[0047] Assume that the exhaust brake valve opening V is, and the diesel engine vibration amplitude is A (in meters per second 2 , measured by the acceleration sensor installed on the diesel engine cylinder block), the diesel engine speed is n, the reference jitter amplitude is A0 (set according to the jitter range during normal operation of the diesel engine), and the speed weight coefficient is ω n , the jitter amplitude weight coefficient is ω A , the adjustment coefficient is k;
[0048] V = k[ω n (nn t )+ω A (A-A0)]
[0049] When the diesel engine vibrates greatly and the speed is higher than the target speed, the exhaust brake valve opening will increase accordingly to better control the diesel engine shutdown process and reduce vibration.
[0050] The valve body control module includes a throttle, an in-cylinder brake valve and an exhaust brake valve. The after-treatment module includes an oxidation catalyst, a particulate filter and a selective catalytic reduction system, which are used to oxidize carbon monoxide and hydrocarbons in the exhaust gas of the diesel engine. During the diesel engine shutdown process, these pollutants in the exhaust gas will still be produced. The precious metal catalyst inside the oxidation catalyst can promote the reaction of carbon monoxide and hydrocarbons with oxygen, converting them into carbon dioxide and water. The particulate filter is responsible for capturing particulate matter in the diesel engine exhaust gas, mainly carbon smoke. During the diesel engine shutdown process, due to incomplete combustion, the particulate matter content in the exhaust gas increases. The porous wall structure of the particulate filter filters these particulate matter to prevent them from being discharged into the atmosphere.
[0051] The following steps are involved:
[0052] Step 1: The ECU module sends a shutdown command to the electronic control unit module, and the electronic control unit module controls the diesel engine to shut down;
[0053] Step 2: The diesel engine vibration, speed and pressure data in the engine pipeline when the engine is turned off are collected by the sensors on the diesel engine and transmitted back to the ECU module;
[0054] Step 3: The ECU module sends instructions to the electronic control unit module according to the data sent back, and the electronic control unit module controls the valve body control module to adjust, and reduces the vibration of the diesel engine during the shutdown process through pneumatic braking;
[0055] Step 4: Treat the exhaust gas during the operation of the diesel engine through the post-processing module.
[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.
Claims
1. A method for improving the vibration of a diesel engine during shutdown, characterized in that: It includes four major subsystems: ECU module, electronic control unit module, valve body control module, and post-processing module. The ECU module is responsible for monitoring and identifying the data sent back by the sensor and sending the corresponding operations to the electronic control unit module based on the data; the electronic control unit module is responsible for receiving the data from the ECU module and controlling the valve body control module according to the data; the valve body control module is responsible for receiving the control of the electronic control unit module and controlling different valve body switches; the post-processing module is responsible for processing the exhaust gas discharged by the diesel engine.
2. A method for improving vibration during shutdown of a diesel engine according to claim 1, characterized in that: The ECU module includes sensors, data acquisition cards, and industrial computers. The sensors include temperature sensors, pressure sensors, speed sensors, torque sensors, and acceleration sensors, which are used to measure the temperature of various parts of the diesel engine, the intake pressure, the speed of the diesel engine, the output torque of the diesel engine, and the vibration of the diesel engine. When a shutdown command is issued, the electronic control unit module is regulated according to the data sent back by the sensors.
3. A method for improving vibration during shutdown of a diesel engine according to claim 2, characterized in that: The electronic control unit module is responsible for receiving data from the ECU module and controlling the valve body control module according to the data. The specific operation formula is as follows: Exhaust brake strength adjustment formula: Assume the opening time of the brake valve in the cylinder is t ib (Unit: seconds), diesel engine vibration amplitude is A (Unit: m / s 2 , measured by an acceleration sensor installed on the diesel engine cylinder block), the reference vibration amplitude is A0 (set according to the vibration range during normal operation of the diesel engine, the specific value is 0.1-0.2 m / s 2 ), the time adjustment coefficients are m1 and m2 (determined by diesel engine performance and experiments); When A>A0, t ib =t ib0 -m1(A-A0), where t ib0 It is the initial setting of valve opening time. When the vibration amplitude of diesel engine is greater than the reference amplitude, the valve opening time will decrease. n1 determines the rate at which the valve opening time decreases with the increase of vibration amplitude, and reduces the braking intensity in the cylinder to reduce vibration. When A < A0, t ib = t ib0 + m2(A0 - A). When the diesel engine jitter amplitude is less than the reference amplitude, the valve opening time will increase. m2 controls the rate at which the valve opening time increases as the jitter amplitude decreases, and appropriately enhances the in-cylinder braking to more quickly consume the energy of the diesel engine.
4. A method for improving vibration during shutdown of a diesel engine according to claim 3, characterized in that: Throttle opening adjustment formula: Assume the intake pressure is P in (Unit: kPa), the target intake pressure is P target (determined according to the stable intake pressure of the diesel engine under different working conditions), k θ is the adjustment coefficient; θ6k θ (P target -P in ) When the intake pressure is lower than the target intake pressure, the throttle opening will increase to allow more air to enter the diesel engine, thereby adjusting the intake volume of the diesel engine to control the rate of decrease of the diesel engine speed and reduce jitter.
5. A method for improving vibration during shutdown of a diesel engine according to claim 4, characterized in that: Exhaust brake valve adjustment formula: Assume that the exhaust brake valve opening V is, and the diesel engine vibration amplitude is A (in meters per second 2 , measured by the acceleration sensor installed on the diesel engine cylinder block), the diesel engine speed is n, the reference jitter amplitude is A0 (set according to the jitter range during normal operation of the diesel engine), and the speed weight coefficient is ω n , the jitter amplitude weight coefficient is ω A , the adjustment coefficient is k; V=k[ω n (nn t )+ω A (A-A0)] When the diesel engine vibrates greatly and the speed is higher than the target speed, the exhaust brake valve opening will increase accordingly to better control the diesel engine shutdown process and reduce vibration.
6. A method for improving vibration during shutdown of a diesel engine according to claim 1, characterized in that: The valve body control module includes a throttle valve, an in-cylinder brake valve and an exhaust brake valve.
7. A method for improving vibration during shutdown of a diesel engine according to claim 1, characterized in that: The post-treatment module includes an oxidation catalyst, a particulate filter, and a selective catalytic reduction system, which are used to oxidize carbon monoxide and hydrocarbons in diesel engine exhaust. During the diesel engine shutdown process, these pollutants in the exhaust gas will still be produced. The precious metal catalyst inside the oxidation catalyst can promote the reaction of carbon monoxide and hydrocarbons with oxygen, converting them into carbon dioxide and water; the particulate filter is responsible for capturing particulate matter in diesel engine exhaust, mainly carbon smoke. During the diesel engine shutdown process, the particulate matter content in the exhaust gas increases due to incomplete combustion. The porous wall structure of the particulate filter filters these particulate matter to prevent them from being discharged into the atmosphere.
8. A method for improving vibration during shutdown of a diesel engine according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: The ECU module sends a shutdown command to the electronic control unit module, and the electronic control unit module controls the diesel engine to shut down; Step 2: The diesel engine vibration, speed and pressure data in the engine pipeline when the engine is turned off are collected by the sensors on the diesel engine and transmitted back to the ECU module; Step 3: The ECU module sends instructions to the electronic control unit module according to the data sent back, and the electronic control unit module controls the valve body control module to adjust, and reduces the vibration of the diesel engine during the shutdown process through pneumatic braking; Step 4: Treat the exhaust gas during the operation of the diesel engine through the post-processing module.
Citation Information
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