Rate Shaping Estimation and Control of a Piezoelectric Fuel Injector

2013 ◽  
Author(s):  
Dat Le ◽  
Bradley W. Pietrzak ◽  
Gregory M. Shaver
Keyword(s):  
Fuel Injection ◽  
Fuel Efficiency ◽  
Nonlinear Behavior ◽  
Fast Response ◽  
Injection Rate ◽  
Fuel Injector ◽  
Fuel Injectors ◽  
Rate Shaping ◽  
Estimation And Control ◽  
Fuel Injection Rate

Fuel injection rate shaping is one way to improve fuel efficiency and reduce harmful emissions in IC engines. Piezoelectrically actuated fuel injectors have a particularly fast response, which makes them capable of rate shaping operation. In this paper, a model-based closed-loop controller is designed to control the fuel injection rate passing through the nozzle of a piezoelectric fuel injector, by compensating for the injector’s nonlinear behavior. The performance of this controller is verified with simulation results.

Dynamic Modeling of a Piezoelectric Actuated Fuel Injector

2011 ◽  
Vol 133 (5) ◽  
Author(s):  
Chris A. Satkoski ◽  
Gregory M. Shaver ◽  
Ranjit More ◽  
Peter Meckl ◽  
Douglas Memering ◽  
...  
Keyword(s):  
Control System ◽  
Injection Rate ◽  
Fuel Injector ◽  
Fuel Injectors ◽  
Response Characteristics ◽  
Rate Shaping ◽  
System Verification ◽  
Reduce Emissions ◽  
And Control ◽  
Injector Design

As engine designers look for ways to improve efficiency and reduce emissions, piezoelectric actuated fuel injectors for common rail diesel engines have shown to have improved response characteristics over solenoid actuated injectors and may allow for enhanced control of combustion through multipulse, closely spaced injections or rate shaping. This paper outlines the development of an 11 state simulation model for a piezoelectric fuel injector and associated driver that can be used for injector design and control system verification. Nonmeasureable states of the model are plotted and analyzed, while measurable quantities including injection rate, piezo stack voltage, and piezo stack current are validated against experimental injector rig data for two different rail pressures.

scholarly journals Fuel Injector Testing Through Development of a New Test Rig

2019 ◽  
Vol 8 (9) ◽  
pp. 2904-2909
Keyword(s):  
Fuel Injection ◽  
Cylinder Liner ◽  
Heating System ◽  
Injection Rate ◽  
Engine Fuel ◽  
Exhaust Manifold ◽  
Fuel Injector ◽  
Test Rig ◽  
Recirculation System ◽  
Fuel Injection Rate

A modified version of fuel injector with higher injection capacity has been developed. To achieve this, the injector plunger diameter is increased to 11mm from current 9.5mm. A new test rig is developed to understand the functioning of the injector due to the changes incorporated. The new test rig is designed to test injector operation without burning the fuel. Since internal combustion is not present an external arrangement is required to run the engine. This is achieved through a 3-phase induction motor, which is coupled with the crankshaft of the engine. The injected fuel is collected form the cylinders and it is then recirculated. A fuel cooling circuit is also incorporated along with the fuel recirculation system to maintain the temperature of fuel at inlet of fuel pump. An oil heating system is installed in the test rig to maintain the viscosity of the oil by heating it. The required systems for driving the engine, fuel cooling and oil heating are implemented as per the design. The test is conducted on a 19 L diesel engine. Parts which are not required for this test like piston, piston rings, intake and exhaust manifold etc are removed from the engine. And the cylinder liner is blocked from below using a plate to facilitate the collection of injected fuel. Engine is made to run using the motoring rig at the rated speed of 1500 rpm for a duration of 250 hours. Instrumented push tubes are used to measure the push tube load. Push tube load is observed to be in the range of 2700 to 3100 lbf, which is high as compared to the earlier model of the injector. Fuel injection rate is obtained from the fuel collected from the cylinders. And the average fuel injection rate is observed as 0.116 to 2.35 kg/min. Thus, the increase in plunger diameter has led to an increase in fuel injection rate

scholarly journals Determining the Diesel fuel injection rate shaping requirements for emission control purposes

2017 ◽  
Author(s):  
Н.С. Маластовский ◽  
◽  
Ф.Б. Барченко ◽  
Л.В. Грехов ◽  
А.С. Кулешов ◽  
...  
Keyword(s):  
Diesel Fuel ◽  
Fuel Injection ◽  
Emission Control ◽  
Injection Rate ◽  
Rate Shaping ◽  
Diesel Fuel Injection ◽  
Fuel Injection Rate

Fuel Injector Design Based on 2D Technology

2012 ◽  
Vol 482-484 ◽  
pp. 1943-1946
Author(s):  
Li Dan Chen ◽  
Huang Xiang Shan
Keyword(s):  
High Speed ◽  
Fuel Injection ◽  
Injection Rate ◽  
Injection System ◽  
Fuel Injector ◽  
Electromagnetic Valve ◽  
Spool Valve ◽  
Fuel Injection Rate ◽  
Injector Design ◽  
The Ideal

Through the discussion of main shortages of the high-speed electromagnetic valve used in electronic fuel injection system, the author introduced a new design thought of fuel injector based on 2D technology. Axial displacement of controlling valve was used to control the volume of gushing oil, while radial revolution of spool valve was used to change the time of injection. Additionally, mathematic modeling and MATLAB simulating indicated that, the injector designed based on 2D technology acquired the advantages of quick response and also realized the ideal shape of fuel injection rate.

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