Studies of control strategies for high pressure common rail diesel engine
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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.Keywords:
Common rail
Engine control unit
Test bench
Electronic control unit
Development of Common Rail System and Performance Researching of Electronic-Controlled Diesel Engine
The electronic-controlled high-pressure common rail system of 6114B diesel engine was presented.Its working principle,performance parameters and key points were studied in detail.The electronic-controlled system was calibrated on the EFS test rig.The identity of injectors was investigated and the difference of injectors could be compensated by software.The control strategy of the common rail system and the matching test of electronic-controlled diesel engine were also studied in this paper.The results show that the all performances of diesel engine with common rail system are better than the diesel engine with in-line pump.
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An ECU (electronic control unit) for the high-pressure common-rail fuel system was designed for production.By using high performance the microcontroller MC68376 according to the modularization method and the reliability design procedure, the hardware and fundamental software of ECU were designed. The hardware was composed of MCU, power, input-output module. And the software included initialization, sampling, and outputting module. The engine bench and real truck test show that the system has powerful function, credible performance and the accurate and reliable control can be relied on.
Common rail
Electronic control unit
Engine control unit
Initialization
Modular programming
Control unit
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In this study, a real-time engine model and a test bench were developed to verify the performance of the EECU (electronic engine control unit) of a turbofan engine. The target engine is a DGEN 380 developed by the Price Induction company. The functional verification of the test bench was carried out using the developed test bench. An interface and interworking test between the test bench and the developed EECU was carried out. After establishing the verification test environments, the startup phase control logic of the developed EECU was verified using the real-time engine model which modeled the startup phase test data with SIMULINK. Finally, it was confirmed that the developed EECU can be used as a real-time engine model for the starting section of performance verification.
Test bench
Turbofan
Electronic control unit
Engine control unit
Control logic
Interface (matter)
Control unit
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Common rail fuel injection system was utilized for diesel engine in order to fulfill national-III and above emission limits.Fuel pressure and injection time were accurately controlled,and multiple injection was realized.Results show that the electromagnetic interference,injector aging and injector manufacture precision can lead to wrap in fuel injection,especially when the injection quantity is small.Then the hardware circuit and software algorithm of common rail fuel injection system control unit,and the delay characteristic of the injector were analyzed.Injector drive circuit control logic,electronic controlled unit electromagnetic interference,and self-study algorithm of little quantity oil injection coherence were presented.Results showed that the anti-aging characteristic and the precision of the injector were improved,and the emission of the diesel engine was improved.
Common rail
Electronic control unit
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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For control of high pressure common rail system in diesel engine,a electric control unit(ECU)based on Infineon XC167 16 bits series chip is developed.Using the design method of modularization,an ECU hardware is developed including signal collection and disposal module,output and drive module,communication module,display and caution interface module.A control software is programmed,and so the common rail system pressure is controlled.
Common rail
Electronic control unit
Interface (matter)
Modular programming
Control unit
Engine control unit
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The paper briefly introduces key technologies of diesel car meeting the future emission, and high-pressure common rail fuel ejection technology is emphasized. Diesel car electronic control system is designed by modularization based on high-pressure common rail system, containing electronic control unit, sensor, actuator and communication network among electronic control units, etc. The experiments prove that the electronic control system works stably and has certain referring signification to domestic self-developing of diesel car.
Common rail
Electronic control unit
Modular programming
Electronic component
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In order to improve marine engineer's operation skill of electronically controlled marine high pressure common rail diesel engine efficiently and to master its technical regulation and working principle,a control simulation system of the engine has been developed.The simulation system is based on the diesel engine's mathematical model,and the computer simulation technology is applied to establish the operational simulation model of the diesel engine.Also CAN bus is applied to construct the hardware system,and then VB 6.0 is used to realize the system.The system has been put into students' training with requested precision,which has laid a solid foundation for the simulation on the electronically controlled high pressure common rail diesel engine.
Common rail
Two-stroke engine
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An electronic control unit(ECU) for high pressure common rail system diesel engines based on Motorola MPC555 is introduced.Using high performance microcontroller MPC555 and adopting schemes of modularization the hardware and fundamental software of the electronic controled unit(ECU) were set up.The hardware is made up of the micro controled unit(MCU),power,input and the output module.The software includes that of initialization,sampling,and outputting module.With this ECU,experiments on rail pressure control and fuel quality at different pulse and rail pressure were carried out,and do some MAP studies on start of injection(SOI) and rail pressure on engine test bench.Experimental results proved that this system can obtain quite fine effects in control.
Common rail
Electronic control unit
Control unit
Engine control unit
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Based on diesel engine equipped with common rail, the multi-injection strategies common rail diesel engine test bed is established with NI test system. In this test bed, the influences of optimized multi-injection strategies to diesel engine performances are studied. The test results show that by using multi-injection strategies, the diesel engine exhaust temperature can reduce 50°C, and noises can reduce 15dB, and emission improve obviously.
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