Real Time Monitoring of Diesel Engine Injector Waveforms for Accurate Fuel Metering and Control

Farooqi, Q. R.; Snyder, Bradley; Anwar, Sohel

doi:10.1155/2013/973141

Cited by 8 publications

(4 citation statements)

References 5 publications

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“…Thus, the voltage signals at the low and high sides are useful for this purpose. Furthermore, in single-fuel engines, a readout of injector signals is often required for diagnosis purposes [21]. The design of the circuit interface and readout is challenging, since those signals exhibit peak values largely exceeding the regulated supply voltage of the readout of electronic circuits and the maximum input voltage that the involved devices can tolerate before incurring permanent damage.…”

Section: Introductionmentioning

confidence: 99%

CMOS Interface Circuits for High-Voltage Automotive Signals

Boni

Caselli

Magnanini³

et al. 2022

Electronics

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The acquisition of high-voltage signals from sensors and actuators in an internal-combustion engine is often required for diagnostic purposes or in the case of conversion to alternative fuels, such as hydrogen, natural gas, or biogas. The integration of electronic interfaces and acquisition circuits in a single device provides benefits in terms of component-count reduction and performance. Nonetheless, the high voltage level of the involved signals makes on-chip design challenging. Additionally, the circuits should be compatible with the CMOS technology, with limited use of high-voltage options and a minimum number of off-chip components. This paper describes the design and the implementation in 350 nm CMOS technology of electronic interfaces and acquisition circuits for typical high-voltage signals of automotive context. In particular, a novel co-design of dedicated voltage clamps with electro-static discharge (ESD) protections is described. The proposed circuits require only a single off-chip resistor, and they are suitable for the acquisition of signals with peak voltages up to 400 V. The measured performance of the silicon prototypes, in the [−40 °C, +125 °C] temperature range, make the proposed electronic interfaces suitable for the automotive domain.

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Section: Introductionmentioning

confidence: 99%

CMOS Interface Circuits for High-Voltage Automotive Signals

Boni

Caselli

Magnanini³

et al. 2022

Electronics

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“…By means of modeling the combustion processes, the possibilities of combining different fuels are tested, which results in improving the efficiency of utilizing the energy of the fuel with a simultaneous optimization of the exhaust gas composition [ 28 , 29 ]. Characteristics of the differential current of the current-related waveforms are analyzed, which enables the fault detection in injectors [ 30 , 31 ]. Modeling is useful as far as diagnostics is concerned for performing analyses, as well as determining the performance of a working element during changes of the work parameters and control values, due to which both the diagnostics and the process of the injector control can be advanced.…”

Section: Introductionmentioning

confidence: 99%

Electric Current Waveform of the Injector as a Source of Diagnostic Information

Więcławski

Mączak

Szczurowski

2020

Sensors

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The article discusses the method of evaluation of the fuel injector operation based on the observation of the electric current parameters, which were measured with a current transducer using the Hall effect, during the dosing process. This method relies on comparison of the electric current-related values of the examined injector with the model characteristics, which are representing the properly functioning injector. A model of the fuel injector in the form of the electric current waveform that describes the changes in the electric current and voltage during its work is presented in this article. Complex equations describing the fuel injector model under discussion account for the characteristics of the current variations, with no damage-induced modifications. Due to these, the modeled electric current/voltage waveform mirrors the real conditions. The use of a mathematical model describing the voltage–current phenomena occurring during the injector operation allows determining the actual beginning and duration of the injection. The model can also be used to develop new injector diagnostic methods that can be implemented in the engine controller (ECU).

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“…Mathematical models [6,7,8,9] were employed in analysis, using simulation programmes such as Matlab Simulink. Delays in opening and closing the gas injector have been discussed, based on the measurement of the increase in the pressure wave downstream of the injector, generated after its bias control [10,11]. The US6657847 patent application is very interesting; it describes using measurement of the injector core inductance to describe changes taking place during its operation [12].…”

Section: Introductionmentioning

confidence: 99%

Electric current characteristics of the injector generating fuel doses

Więcławski¹,

Mączak²,

Szczurowski³

2018

Diagnostyka

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In this article, the proposal for modelling the gas (fuel) injector based on observations of changes in the current during operation of the needle is presented. The aim of this work is indicating that the dosage characteristics can be mapped by means of the current characteristics. Moreover, observation of the current allows for determining the actual position of the needle. The time of the real fuel flow and the injector phase position can be determined with a microsecond resolution. The injector core inductance is a constant quantity but as a result of the needle movement and change in the permeability, inductance of the core varies depending on the needle position. These quantities, closely related to the current flowing through the coil, are described by means of differential equations resulting from the Kirchhoff's law, due to which changes taking place can be substantiated. Control of the flux enables the precise controlling of the injector in the actual time, thanks to the employment of fast analogue-digital converters and phase are taken into consideration.CHARAKTERYSTYKA PRĄDOWA WTRYSKIWACZA GENERUJĄCEGO DAWKI PALIWOWE Streszczenie W artykule zaprezentowano propozycję modelowania wtryskiwacza gazowego (paliwowego), na podstawie obserwacji zmian prądowych, w trakcie wykonywania pracy przez jego iglicę. Celem artykułu jest pokazanie, że można poprzez charakterystyki prądowe, odzwierciedlić charakterystyki dawkowania. Dodatkowo obserwacja prądu, pozwala określić aktualną pozycję iglicy. Możemy określić czas rzeczywistego przepływu paliwa i położenie fazowe wtrysku z precyzją mikrosekundową. Indukcyjność rdzenia wtryskiwacza jest wielkością stałą, ale w wyniku przesuwania iglicy i zmiany przenikalności, indukcyjność rdzenia zmienia się w zależności od położenia iglicy. Wielkości te, ściśle związane z przepływającym przez cewkę prądem, opisane są przez równania różniczkowe wynikające z prawa Kirchhoffa, dzięki czemu potrafimy uzasadnić zachodzące zmiany. Kontrola przepływu, pozwala na precyzyjne sterowanie wtryskiwaczem w czasie bieżącym, dzięki wykorzystaniu szybkich przetworników analogowo -cyfrowych i odpowiednich algorytmów. W sterowaniu uwzględniamy opóźnienia w działaniu impulsowego wtryskiwacza i przesunięcia fazy przepływu.Słowa kluczowe: indukcyjność, strumień magnetyczny, wtryskiwacz

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Real Time Monitoring of Diesel Engine Injector Waveforms for Accurate Fuel Metering and Control

Cited by 8 publications

References 5 publications

CMOS Interface Circuits for High-Voltage Automotive Signals

CMOS Interface Circuits for High-Voltage Automotive Signals

Electric Current Waveform of the Injector as a Source of Diagnostic Information

Electric current characteristics of the injector generating fuel doses

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