Experimental Study for Cold Starting Performance with 6DL1-32 Diesel Engine
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Independent electronically-controlled high pressure common rail system was used to explore cold starting strategies of CA6DL1-32 diesel engine,and cold starting control algorithms were designed,including main injection fuel,main injection timing and staring object pressure.It was showed by results that performance for cold starting capability of the engine can be extremely improved through independent common rail system and optimized control strategies without any auxiliary devices,so code starting capability of the engine can meet actual requirements of automobile.Keywords:
Staring
Common rail
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The performance of Diesel engine control system influence the engine combination property directly. The traditional mechanical control system can't meet the requirements of the fuel consumption and emissions. We should turn to the advanced electronic control system. This article introduced the basic frame and control mode of low-speed common rail diesel engine electronic control system, and according to the control object, the whole control system is divided into different modules to detailed analysis.
Common rail
Mode (computer interface)
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Design of injection control strategy is an important part in the development of high pressure common rail diesel engine. Based on ECD-U2 common rail system and ECU developed independently, this paper analyzed control requirement in various conditions of diesel engine. And then injection control software was designed and realized according to detailed control strategy, which enables steady rail pressure, precise fuel quantity and injection timing, as well as the performance of rapid starting and stable running. Finally, the test results verify the control precision, feasibility and reliability, and anticipated control effect was achieved.
Common rail
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Based on high pressure common rail diesel engine protection system,the differences between traditional engine protection mechanics and high pressure common rail diesel engine protection system were contrasted and analyzed,and the influences of engine protection on engine performance and emissions were systematically studied.The protection strategies for brake,overheat,overload,over-speed,exhaust smoke and turbocharger were proposed and the real-time calculation was conducted by using ramp function.The calibration of main MAP and the simulation of control strategy were carried out by using INCA and ASCET software.The test results show that the diesel engine protection can be effectively improved through this control strategy.
Common rail
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Wartsila RT-flex 60C diesel engine is selected as the object to research pressure control of fuel common rail system, building the system simulation model, and analyzing main factors influencing rail pressure in the system. it was concluded that they were diesel engine speed, load. In the process of MATLAB/Simulink simulation, the rail pressure control logic was designed by adopting maps with the two factors as independent variables to get theory feedforward quantity of fuel rack, feedback quantity of fuel rack is obtained by fuzzy PID control. The simulation experiments show that the improved control method reduces the rail pressure fluctuation, at the same time the overshoot volume of dynamic rail pressure control is greatly reduced, response velocity quickened. The control method has been used in a Marine simulator.
Common rail
Overshoot (microwave communication)
Feed forward
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Characteristics which involve pressure rising, rotational speed increasing and dynamic smoke emission in the startup procedure of the high pressure common rail diesel engine are brought forward in this paper. Aiming at the optimization of the exhaust smoke, the method for calibrating and optimizing fuel injection parameters is also presented,which includes the orthogonal experiment method and the division of the start process into three stages. The test is carried out on a 6cylinder common rail diesel engine.
Common rail
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According to starting characteristics of the engine,a Simulink-based control strategy of electronic diesel engine was designed.Two major stages that drag without fuel injection stage and drag with fuel injection stage were included in the start-up process.The simulation and experimental tests were operated according to the actual engine operating situation.The experiments show that in a good starting condition,the starting speed can be increased and the smoking restriction can be reduced by adding the control of drag with fuel injection stage;while in a harsh starting condition,the start-up efficiency can be significantly improved under coordinating controls of drag with fuel injection and fuel feedback of slope compensation.
Engine control unit
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Based on starting characteristic of traditional diesel engine, the starting demands of electronic controlled diesel engine are analyzed. The starting control logic in the electronic controlled diesel engine is established with the help of electronic control unit in high pressure common rail. The fuel quality supplied during starting process is calculated by MAP method, and its adjustment is made with the ramp function. Finally, the starting control system in high pressure common rail diesel engine is designed.
Common rail
Electronic control unit
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Modeling and simulation of common rail fuel system of electronically controlled marine diesel engine
In order to analyze the dynamic performance of common rail fuel system of an electronically controlled marine diesel engine as well as the influence of parameters on system performance,a 7RT-flex 60C diesel engine is selected as the research subject to study the working principle and structural features of the common rail fuel system.A mathematical model of the major components of the system is established,and a simulation program is developed by SIMULINK to simulate the characteristics of lift,pressure and flow characteristics of the system.The results show that the model achieves higher accuracy.On the above results,the influence of correlated parameters on the performance of the system is studied.Higher rotational speed of the high pressure oil pump leads to faster change of fuel supply rate.In the presence of the same fuel injection pulse width,the increase of common rail pressure leads to faster fuel injection rate.The volume of intermediate oil storage device and common rail has greater effect on fluctuation of common rail pressure.It is suggested that a greater buffer volume or a segmented common rail tube be used in the premise of satisfying the start-up performance of diesel engine.
Common rail
Lift (data mining)
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Based on Freescale 9S12 16-bit electronic control unit,the start process of common rail diesel engine was divided into four phases,which were initial phase,acceleration phase,transition phase and steady phase.The optimization scheme of control strategy was put forward in accordance with the feature of each stage.The simulation model of fuel injection was established with the Matlab/Simulink software.After the offline optimization,the model was calibrated on a 4JB1 high-pressure common rail diesel engine.The results show that the start process of diesel engine is fast and its transition process is stable after the optimization.
Common rail
Electronic control unit
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The main objective of this study is to develop the injection control strategy for high pressure common rail diesel engine based on the Electronic Control Unit (ECU) with the micro-controller MPC555. The control software was designed by modularization method according to various working conditions of diesel engine. The software modules include the fuel quantity control module, rail pressure control module, point of the engine operation (POP) management module, four stages of the start procedure control module, and so on. Finally, experiments were carried out on test bench to verify the control feasibility and reliability of the strategies and optimize the emissions, Experimental results showed that the anticipated control effects were achieved and the engine reached the EURO-square exhaust emission standard.
Common rail
Engine control unit
Test bench
Electronic control unit
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Citations (9)