An engine control system and protection strategy

Abstract

An engine control system and protection strategy relates to the field of engine technology, and in particular, belongs to an engine control system and protection strategy. It includes an electronic control unit, an oil-gas separator, a control valve arranged between the oil-gas separator and the pipeline before the supercharger, and a sensor assembly for detecting crankcase pressure and oil-gas separator speed. The open end of the control valve is connected to the atmospheric pipeline. The control valve and the sensor assembly are both connected to the electronic control unit. The electronic control unit is used to act on the control valve according to the feedback of the sensor assembly. The control valve is used to realize the switching between the closed cycle and the open cycle of the engine breathing system. The present invention can improve and accurately control the separation efficiency of the oil-gas separator and protect the performance of the engine.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to an engine control system and protection strategy. Background Art

[0002] With the gradual escalation of emission regulations, active oil-gas separators are gaining increasing popularity due to their high separation efficiency and reliability. Currently, the most commonly used active oil-gas separators operate by driving an impeller with engine oil, which in turn causes the separation structure within the oil-gas separator to rotate at high speed, completing the oil-gas separation. This method effectively separates the oil and gas in the mixture, but has the following drawbacks: 1. Oil must be drawn from the engine oil gallery; 2. The speed of the active oil-gas separator is positively correlated with the oil pressure. When the oil pressure is low, the active oil-gas separator will still draw oil from the oil gallery. When the oil pressure is high, the active oil-gas separator is at risk of overspeeding, which can affect the life of the oil-gas separator; 3. Precise control of the oil-gas separator speed is impossible, and the deterioration of separation efficiency due to engine blowby cannot be corrected; 4. In a closed-cycle system, if the crankcase pressure increases abnormally, the oil content of the exhaust gas increases, and oil can enter the cylinder and burn abnormally, leading to severe failures.

[0003] Patent application number 202011429651.4 relates to an oil-gas separation system, a control method for an oil-gas separation system, and a vehicle. The system first obtains the pressure information and flow information of the mixed gas discharged from the crankcase, and then obtains the pressure information required by the oil-gas separator based on the obtained pressure information and flow information and the corresponding relationship data between the preset oil content of the mixed gas and the pressure required by the oil-gas separator. Finally, the regulating valve is controlled according to the power information required by the oil-gas separator, so that the regulating valve adjusts the power acting on the oil-gas separator so that the speed of the oil-gas separator matches the oil content of the mixed gas discharged from the crankcase, thereby improving the problem that the size of the active separation power of the oil-gas separator is mainly related to the engine speed, so that the oil-gas separator runs at high speed and low load for a long time, which is beneficial to improving the service life of the oil-gas separator.

[0004] This application is different from the research direction of the above-mentioned patents. It now provides an engine control system and protection strategy, which aims to improve and accurately control the separation efficiency of the oil-gas separator during engine operation, reduce the oil content of the exhaust gas, and control the breathing system to switch between open or closed circulation modes while meeting emission regulations, thereby avoiding severe faults such as abnormal combustion of engine oil in the cylinder due to abnormal increase in crankcase pressure. Summary of the Invention

[0005] The purpose of the present invention is to provide an engine control system and protection strategy to achieve the purpose of improving and accurately controlling the separation efficiency of the oil-gas separator and protecting the performance of the engine.

[0006] An engine control system provided by the present invention is characterized in that it includes an electronic control unit, an oil-gas separator, a control valve arranged between the oil-gas separator and the front pipeline of the supercharger, and a sensor assembly for detecting crankcase pressure and oil-gas separator speed. The open end of the control valve is connected to the atmospheric pipeline, and the control valve and the sensor assembly are both connected to the electronic control unit. The electronic control unit is used to act on the control valve according to feedback from the sensor assembly, and the control valve is used to realize switching between closed circulation and open circulation of the engine breathing system.

[0007] Furthermore, it also includes an alarm device connected to the electronic control unit. When the sensor component detects an abnormal increase in the pressure of the crankcase, the alarm device sounds an alarm under the control of the electronic control unit.

[0008] Furthermore, the alarm device is an audible and visual alarm arranged in the cab.

[0009] Furthermore, the control valve is a triangular valve.

[0010] The present invention provides a protection strategy for an engine control system, which is characterized in that:

[0011] During the engine development phase, tests were conducted to determine the blowby volume and crankcase pressure corresponding to different engine speeds and loads, as well as the oil-gas separator speed required to meet the exhaust oil content limit. Based on the corresponding data between the blowby volume, crankcase pressure, and oil-gas separator speed, a map was generated based on the blowby volume, crankcase pressure, oil-gas separator separation efficiency, and oil-gas separator speed under various operating conditions.

[0012] The crankcase pressure information and the oil-gas separator speed information are obtained, and the electronic control unit outputs a control signal according to a set priority control mechanism. The priority control mechanism includes:

[0013] First priority: When the crankcase pressure increases abnormally, the ECU controls the motor-controlled active oil-gas separator to increase separation efficiency, adjusts the control valve to switch from a closed cycle to an open cycle, and issues an alarm.

[0014] Second priority: The engine uses its own ambient temperature and pressure sensors to intelligently identify high altitude and low temperature environments, and adjusts the control valve to switch from a closed cycle to an open cycle.

[0015] Third priority: Under normal operating conditions, according to the set map information, the electronic control unit controls the speed of the active oil-gas separator according to the partition processing mechanism of different areas in the map information.

[0016] Furthermore, the partition processing mechanism includes:

[0017] No-risk zone: The oil pressure is high, the oil-gas separator speed is high, the engine load is small, the air leakage is small, and no intensive monitoring is required;

[0018] Risk Area 1: Low oil pressure, low oil-gas separator speed, low engine load, and small gas leakage. If the crankcase pressure is low, it can meet the demand by itself. If the crankcase pressure is high, the electric drive and hydraulic drive are combined to increase the oil-gas separator speed to meet the demand.

[0019] Risk Area 2: Low oil pressure, low oil-gas separator speed, low engine load, and small gas leakage. If the crankcase pressure is low, it can meet the demand by itself. If the crankcase pressure is high, the electric drive and hydraulic drive are combined to increase the oil-gas separator speed to meet the demand.

[0020] Risk Area 3: The oil pressure is low, the speed of the active oil-gas separator is high, the engine load is high, and the leakage is large. If the crankcase pressure is low, it can meet the demand by itself; if the crankcase pressure is high, the electric drive and hydraulic drive are combined to increase the speed of the active oil-gas separator to meet the demand.

[0021] The present invention provides an engine control system and protection strategy that utilizes an electronic control unit (ECU) to monitor engine parameters, crankcase pressure, and oil / gas separator speed. The ECU integrates a map of leak rate, crankcase pressure, oil / gas separator separation efficiency, and oil / gas separator speed under various operating conditions. When crankcase pressure abnormally increases, the ECU controls an active motor-controlled oil / gas separator to increase its separation efficiency. The engine's breathing system switches from a closed cycle to an open cycle, and an alarm is issued to prompt the driver to take immediate action, thereby preventing excessive oil leakage into the cylinders and causing runaway failures. Furthermore, in high-altitude and low-temperature environments, where national regulations allow for the switch from a closed cycle to an open cycle without considering emissions and OBD testing, the engine's breathing system can be switched from a closed cycle to an open cycle, effectively protecting engine performance and extending engine life. In summary, the present invention monitors crankcase pressure in real time, promptly detects abnormalities based on crankcase pressure, and takes appropriate action, resulting in improved and precise control of the oil / gas separator's separation efficiency and protection of engine performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural principle diagram of the present invention;

[0023] Figure 2 Schematic diagram of map information inside the electronic control unit of the present invention. DETAILED DESCRIPTION

[0024] like Figure 1-2 As shown, the present invention provides an engine control system, comprising an electronic control unit, an oil-gas separator, a control valve disposed between the oil-gas separator and the pipeline preceding the supercharger, and a sensor assembly for detecting crankcase pressure and oil-gas separator speed. The open end of the control valve is connected to the atmospheric pipeline, and the control valve and the sensor assembly are both connected to the electronic control unit. The electronic control unit is used to act on the control valve according to the feedback of the sensor assembly, and the control valve is used to realize the switching between the closed cycle and the open cycle of the engine breathing system. In a specific embodiment, the sensor assembly may include a pressure sensor disposed on the crankcase and a speed sensor on the active oil-gas separator; the control valve is a triangular valve.

[0025] To promptly notify the user of engine anomalies, the present invention further includes an alarm device connected to the electronic control unit. When the sensor assembly detects an abnormal increase in crankcase pressure, the alarm device, under the control of the electronic control unit, issues an alarm. In a specific embodiment of the present invention, the alarm device is an audible and visual alarm located within the cab. Under the control of the electronic control unit, the alarm device issues an audible and visual alarm, enabling the user to promptly detect engine anomalies and perform engine maintenance as soon as possible.

[0026] The present invention also provides a protection strategy for an engine control system, the specific implementation process of which is as follows:

[0027] During the engine development phase, tests were conducted to determine the blowby volume and crankcase pressure corresponding to different engine speeds and loads, as well as the oil-gas separator speed required to meet the exhaust oil content limit. Based on the corresponding data between the blowby volume, crankcase pressure, and oil-gas separator speed, a map was generated based on the blowby volume, crankcase pressure, oil-gas separator separation efficiency, and oil-gas separator speed under various operating conditions.

[0028] After obtaining crankcase pressure information and oil-gas separator speed information, the electronic control unit outputs a control signal according to a set priority control mechanism. Specifically, the priority control mechanism includes:

[0029] First priority: When the crankcase pressure increases abnormally, the ECU controls the active oil-gas separator with motor control to increase the separation efficiency, and adjusts the control valve to switch from a closed cycle to an open cycle. At the same time, an alarm is issued to remind the driver to take measures to avoid a large amount of oil from entering the cylinder, which may cause runaway and other faults, so as to ensure the safety of the vehicle and the driver.

[0030] Second priority: Through the engine's own ambient temperature sensor and pressure sensor, it intelligently identifies the location in a high-altitude and low-temperature environment (national regulations allow emissions and OBD testing to be disregarded), and adjusts the control valve from a closed cycle to an open cycle to protect engine performance and extend engine life.

[0031] Priority 3: Under normal operating conditions, the ECU controls the speed of the active oil separator according to the zone processing mechanism for different zones in the map information, based on the set map information. The zone processing mechanism includes:

[0032] No-risk zone: The oil pressure is high, the oil-gas separator speed is high, the engine load is small, the air leakage is small, and no intensive monitoring is required;

[0033] Risk Area 1: Low oil pressure, low oil-gas separator speed, low engine load, and small gas leakage. If the crankcase pressure is low, it can meet the demand by itself. If the crankcase pressure is high, the electric drive and hydraulic drive are combined to increase the oil-gas separator speed to meet the demand.

[0034] Risk Area 2: Low oil pressure, low oil-gas separator speed, low engine load, and small gas leakage. If the crankcase pressure is low, it can meet the demand by itself. If the crankcase pressure is high, the electric drive and hydraulic drive are combined to increase the oil-gas separator speed to meet the demand.

[0035] Risk Area 3: The oil pressure is low, the speed of the active oil-gas separator is high, the engine load is high, and the leakage is large. If the crankcase pressure is low, it can meet the demand by itself; if the crankcase pressure is high, the electric drive and hydraulic drive are combined to increase the speed of the active oil-gas separator to meet the demand.

[0036] It is worth noting that the above electric drive and hydraulic drive can be specifically set according to actual needs. Since they are existing technologies, they will not be described here in detail.

[0037] The present invention utilizes an electronic control unit (ECU) to monitor engine parameters, crankcase pressure, and oil / gas separator speed. The ECU integrates a map of leak information, crankcase pressure, oil / gas separator separation efficiency, and oil / gas separator speed under various operating conditions. When crankcase pressure abnormally increases, the ECU controls the motor-controlled active oil / gas separator to increase its efficiency. The engine's breathing system switches from a closed cycle to an open cycle, and an alarm sounds, prompting the driver to take immediate action. This prevents excessive oil intrusion into the cylinder, which can cause runaway failures. Furthermore, at high altitudes and low temperatures, national regulations allow the engine's breathing system to switch from a closed cycle to an open cycle, regardless of emissions and OBD testing. This effectively protects engine performance and extends its service life. The present invention monitors crankcase pressure in real time, promptly detecting abnormalities and taking appropriate action based on the crankcase pressure, thereby effectively protecting the engine.

Claims

1. An engine control system comprising an electronic control unit, an oil-gas separator, a control valve disposed between the oil-gas separator and a pipeline preceding a supercharger, and a sensor assembly for detecting crankcase pressure and oil-gas separator rotational speed, wherein the open end of the control valve is connected to an atmospheric pipeline, the control valve and the sensor assembly are both connected to the electronic control unit, the electronic control unit being configured to act on the control valve based on feedback from the sensor assembly, the control valve being configured to switch between a closed cycle and an open cycle of the engine breathing system, and a protection strategy based on the above engine control system being characterized in that: During the engine development phase, tests were conducted to determine the blowby volume and crankcase pressure corresponding to different engine speeds and loads, as well as the oil-gas separator speed required to meet the exhaust oil content limit. Based on the corresponding data between the blowby volume, crankcase pressure, and oil-gas separator speed, a map was generated based on the blowby volume, crankcase pressure, oil-gas separator separation efficiency, and oil-gas separator speed under various operating conditions. The crankcase pressure information and the oil-gas separator speed information are obtained, and the electronic control unit outputs a control signal according to a set priority control mechanism. The priority control mechanism includes: First priority: When the crankcase pressure increases abnormally, the ECU controls the motor-controlled active oil-gas separator to increase separation efficiency, adjusts the control valve to switch from a closed cycle to an open cycle, and issues an alarm. Second priority: The engine uses its own ambient temperature and pressure sensors to intelligently identify high altitude and low temperature environments, and adjusts the control valve to switch from a closed cycle to an open cycle. Priority 3: Under normal operating conditions, the electronic control unit controls the speed of the active oil-gas separator according to the zone processing mechanism of different areas in the map information according to the set map information. The zone processing mechanism includes: No-risk zone: The oil pressure is high, the oil-gas separator speed is high, the engine load is small, the air leakage is small, and no intensive monitoring is required; Risk Area 1: Low oil pressure, low oil-gas separator speed, low engine load, and small gas leakage. If the crankcase pressure is low, it can meet the demand by itself. If the crankcase pressure is high, the electric drive and hydraulic drive are combined to increase the oil-gas separator speed to meet the demand. Risk Area 2: Low oil pressure, low oil-gas separator speed, low engine load, and small gas leakage. If the crankcase pressure is low, it can meet the demand by itself. If the crankcase pressure is high, the electric drive and hydraulic drive are combined to increase the oil-gas separator speed to meet the demand. Risk Area 3: The oil pressure is low, the speed of the active oil-gas separator is high, the engine load is high, and the leakage is large. If the crankcase pressure is low, it can meet the demand by itself; if the crankcase pressure is high, the electric drive and hydraulic drive are combined to increase the speed of the active oil-gas separator to meet the demand.

2. An engine control system according to claim 1, characterized in that: It also includes an alarm device connected to the electronic control unit. When the sensor component detects an abnormal increase in the pressure of the crankcase, the alarm device sends out an alarm under the control of the electronic control unit.

3. The engine control system according to claim 2, characterized in that: The alarm device is an audible and visual alarm arranged in the cab.

4. The engine control system according to claim 3, characterized in that: The control valve is a triangular valve.

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