Abstract
The aim of this paper is to develope a mechatronic control system to replace mechanical fuel injection system of a four-cylinder automotive diesel engine, to study what are the important electronics fuel injection parameters which have the highest effect on the engine performance. All the paperwork performed on Isuzu engine 4HF1 which is 4 cylinder diesel engine working with fully mechanical fuel injection system. To develop mechatronics fuel system, must install crank sensor which measure the engine speed in RPM and specify the piston position, cam sensor which specifies the injection order, common rail fuel injection system which includes electronic injectors, high pressure pump and common rail, ECU which control all the system inputs and outputs and injectors driver controller which responsible for delivering the required high voltage for the injectors with high speed switching. ECU software will be developed from scratch to develop injection quantity, injection time and injection order output signals to be compatible with the common rail fuel system. Mathworks tools (Matlab-Simulink-Stateflow) will be used for developing ECU software application layer which divided into many models as crankshaft speed model, crankshaft sensor piston position, cam sensor injection order model, pedal speed model, injectors model, torque model and final model which collect all the previous models. Embedded coder toolbox will be used for generating C code which will be integrated with the microcontroller layer and uploaded to the selected ECU.
Highlights
The Internal combustion engine industry is one of the fastest growing industries in the world since it is the heart of a lot of applications as automotive industries, heavy equipment, power generation and a lot of other applications, so there is a big need to enhance the performance for internal combustion engine continuously
Mechatronics plays an important role in these enhancements, so most of the internal combustion engines contains a lot electronics and controllers so in this paper a mechatronic control system will be developed to replace mechanical fuel injection system of a four-cylinder automotive diesel engine, to study what are the important electronics fuel injection parameters which have the highest effect on the engine performance
The engine started but not efficiently since there is a hunting and when trying to increase the rpm, the engine shut off, from this problem we can specify the important electronics fuel injection parameters which have the highest effect on the engine performance since this problem causes be as follows:1-At engine speed 420 rpm, the engine must inject at least three times per second and it is clear from the Fig. 21 oscilloscope reading that there is a lag in the injection pulses, this may be caused be the following:
Summary
The Internal combustion engine industry is one of the fastest growing industries in the world since it is the heart of a lot of applications as automotive industries, heavy equipment, power generation and a lot of other applications, so there is a big need to enhance the performance for internal combustion engine continuously. Before starting software developing there is an important note must be taken into consideration through software developing, changing the injection frequency will decrease or increase the engine rpm but changing the fuel injection quantity will decrease or increase the engine load This model measure the engine speed (RPM), it will count every high pulse detected by the crank sensor and since the reluctor wheel is 59 tooths, when sensor detects 59 high signal, this will be one rpm, Simulink model blocks (Fig. 15) (Bonnick, 2001; Zurawski, 2009): 1. This model will compare every tooth width with the one until detecting the wider one, the model has five subsystems blocks (first tooth subsystem blocknext tooth- model reseting-comparing-independent subsystem block) Starting with crank speed model, after detecting the high pulse the output of the AND logic block will be input to the K data store block and the independent subsystem Block which contains the following blocks (Fig. 16): 1. F data store connected to increment stored integer block with initial value 0
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