Fuel Injection Pump Calibration: A Comprehensive Guide for Diesel Engine Owners and Mechanics
The MBC Optimization app in Model-Based Calibration Toolbox lets you generate optimal calibrations for lookup tables that control engine functions, such as spark ignition, fuel injection, and inlet and exhaust valve timing. Calibration of these features typically involves tradeoffs between engine performance, economy, reliability, and emissions. You can:
fuel injection pump calibration pdf download
Download Zip: https://www.google.com/url?q=https%3A%2F%2Furlcod.com%2F2u7Xca&sa=D&sntz=1&usg=AOvVaw1Tpx0XcDgUfVx1Kwx_cchN
The performance of diesel engines is heavily influenced by their injection system design. In fact, the most notable advances achieved in diesel engines resulted directly from superior fuel injection system designs. While the main purpose of the system is to deliver fuel to the cylinders of a diesel engine, it is how that fuel is delivered that makes the difference in engine performance, emissions, and noise characteristics.
However, it is still not enough to deliver an accurately metered amount of fuel at the proper time to achieve good combustion. Additional aspects are critical to ensure proper fuel injection system performance including:
Start of injection (SOI) or injection timing is the time at which injection of fuel into the combustion chamber begins. It is usually expressed in crank angle degrees (CAD) relative to TDC of the compression stroke. In some cases, it is important to differentiate between the indicated SOI and actual SOI. SOI is often indicated by an easily measured parameter such as the time that an electronic trigger is sent to the injector or a signal from a needle lift sensor that indicates when the injector needle valve starts to open. The point in the cycle where this occurs is the indicated SOI. Due to the mechanical response of the injector, there can be a delay between the indicated SOI and the actual SOI when fuel exits the injector nozzle into the combustion chamber. The difference between the actual SOI and indicated SOI is the injector lag.
Start of delivery. In some fuel systems, fuel injection is coordinated with the generation of high pressure. In such systems, the start of delivery is the time when the high pressure pump starts to deliver fuel to the injector. The difference between start of delivery and SOI is affected by the length of time it takes for a pressure wave to travel between the pump and injector and is influenced by the length of line between the high pressure pump and the injector and by the speed of sound in the fuel. The difference between the start of delivery and SOI can be referred to as injection delay.
Injection pattern. The rate of injection of fuel often varies during the injection duration period. Figure 2 shows three common rate shapes: boot, ramp and square. Opening rate and closing rate refers to the gradients in the rate of injection during needle nozzle opening and closing events, respectively.
Multiple injection events. While conventional fuel injection systems employ a single injection event for every engine cycle, newer systems can use multiple injection events. Figure 3 defines some of the common terms used to describe multiple injection events. It should be noted that the terminology is not always consistent. The main injection event provides the bulk of the fuel for the engine cycle. One or more injections before the main injection, pre-injections, provide a small amount of fuel before the main injection event. Pre-injections can also be referred to as pilot injection. Some refer to a pre-injection that occurs a relatively long time before the main injection as a pilot and one that occurs a relatively short time before the main injection as a pre-injection. Injections after the main injections, post-injections, can occur immediately after the main injection (close post-injection) or a relatively long time after the main injection (late post-injection). Post-injections are sometimes called after-injections. While there is considerable variation in terminology, a close post-injection will be referred to as a post-injection and a late post-injection as an after-injection.
Metering of the injected fuel amount is commonly carried out in either the high pressure pump or the fuel injector. A number of different fuel metering approaches exist including: pressure metered at a constant time interval (PT), time metered at a constant pressure (TP) and time/stroke metered (TS).
Most fuel injection systems use electronics to control the opening and closing of the nozzle. Electrical signals are converted into mechanical forces using some type of actuator. Commonly, these actuators can be either electromagnetic solenoids or active materials such a piezoelectric ceramics.
To enhance the calibration efficiency, reduce the fuel consumption and improve the emission performance of the engine, a calibration method using Gaussian Process Regression (GPR) is proposed in this work. First, the design of experiment (DoE) is constructed by using the Space-filling method, and the engine bench sampling test is implemented according to results of DoE. Then, the square exponential covariance function is selected through the comparison of four covariance functions, and the corresponding hyper-parameters are optimized by using Newton gradient algorithm. Finally, the GPR model of the engine is established and its calibration performance is validated by the experimental data. The comparison shows that the performance of the developed GPR model is superior to the Polynomial model and Neural Network model, whose coefficient of determination (R2) of Fuel Consumption (FC), NOx emission (NOx) and Soot emission (Soot) are up to 0.9980, 0.9326 and 0.9247. The case study demonstrates that the virtual calibration optimization based on GPR model improves the fuel consumption performance greatly, while taking NOx and Soot emission indicators into account.
FAST releases FASTView, a FREE and easy-to-use software program for downloading, storing, viewing and comparing air/fuel data logs The revolutionary FAST Air/Fuel Meter brought cutting edge air/fuel measurement technology to racers everywhere. Expanding on the usefulness of this meter, FAST created a free, easy-to-use software package for owners who have upgraded their meter with the FAST RPM Module. Called FASTView, this complete software package allows you to download, playback, store and even plot the data so you can compare air/fuel data logs on your personal computer. The FASTView Software couldnt be easier to use. All downloading is accomplished using the communication cable found in your optional RPM Module Kit. Once downloaded and stored, you can use the playback feature to open up your data logs and play them back in real time or use the plotting feature to overlay them for comparison. The playback also shows the precise elapsed time of the data log and displays the data not only as a raw number, but also with digital needle gauges that help you to spot air/fuel and rpm trends during your run.