Individual Cylinder Knock Control by Detecting Cylinder Pressure

Sawamoto, Kunifumi; Kawamura, Y.; Kita, Toru; Matsushita, Kenjiro

doi:10.4271/871911

Cited by 48 publications

(22 citation statements)

References 4 publications

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“…In-cylinder pressure monitoring can be used in order to optimize the spark advance so that the pressure peak is located at a desired crank angle relative to top dead centre (TDC), as well as to detect knocking combustion and misfire. It has been reported that engine management systems using feedback control in conjunction with a pressure sensor have achieved 5 per cent increase in efficiency (1) and up to 10 per cent increase in power (2). However, the installation of a pressure transducer requires additional space in the cylinder head and is not cost effective.…”

Section: Introductionmentioning

confidence: 98%

Engine performance monitoring using spark plug voltage analysis

Zhao

Ladommatos

1997

Proceedings of the Institution of Mechanical Engineers, Part D:

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Spark plug based engine combustion diagnostics have the advantage of simplicity and easy access. Over the years there has been considerable interest in developing and applying spark plug ionization probes to monitor the in-cylinder combustion process. In this paper, alternative approaches are presented using the spark plug as the primary sensor. These methods are based on the analysis of the spark voltage and a secondary high-voltage discharge. A series of experiments have been conducted to evaluate their potential in the measurement of combustion quality and the detection of misfire. It is found that the spark voltage decay time is related to the initial flame kernel development and may be used to detect misfire and deteriorating combustion quality in the initial flame development. The results also show that the analysis of secondary voltage decay time could be an effective means of monitoring the combustion quality and detecting misfire during the main combustion period.

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Section: Introductionmentioning

confidence: 98%

Engine performance monitoring using spark plug voltage analysis

Zhao

Ladommatos

1997

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…They mainly cause fluctuations in the rate of heat release, turning in fluctuations in the power output, fuel consumption and exhaust emissions. Their unpredictable and stochastic character pose several problems to the development of optimal engine control systems [2,3] and limits the vehicle driveability.…”

Section: Introductionmentioning

confidence: 99%

Cycle-by-Cycle Analysis, Knock Modeling and Spark-Advance Setting of a “Downsized” Spark-Ignition Turbocharged Engine

Bozza¹,

Siano²,

Torella³

2009

SAE Int. J. Engines

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Recently, a tendency is consolidating to produce low displacement turbocharged spark-ignition engines. This design philosophy, known as "engine downsizing", allows to reduce mechanical and pumping losses at low load as a consequence of the higher operating Brake Mean Effective Pressure (BMEP). The presence of the turbocharger allows to restore the maximum power output of the larger displacement engine. Additional advantages are a higher low-speed torque and hence a better drivability and fun-to-drive. Of course, at high loads, the spark-advance must be carefully controlled to avoid the knock occurrence and this determines a substantial penalization of the fuel consumption. The knowledge of the knock-limited spark timing is hence a key point in order to reduce the fuel consumption drop at high loads.

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“…Dual-wavelength reference ratio output Vf can be expressed as (4) where some constant ratio terms are omitted in this expression, as we are primarily concerned with normalized sensor output and its percentage variation here. Fiber transmission change due to increased absorption and microbending losses are common for measurement and reference optical signals, and are thus canceled in the ratio process.…”

Section: Theorymentioning

confidence: 99%

<title>High-temperature performance analysis of automotive combustion pressure sensor</title>

Wlodarczyk

1993

SPIE Proceedings

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A theoretical approach is developed to evaluate pressure detection sensitivity and its temperature dependence for diaphragin-t ype fiber optic combustion pressure sensors. Temperature-induced mechanical response variations and diaphragm optical reflectivity degradation, particularly at high temperatures, are identified as the two major factors that produce errors in sensitivit y, and hence in pressure measurement. Experimental results using hermetically sealed sensor construction prove the feasibifit y of maintaining diaphragm optical reflectivity under high temperatures. This analysis predicts that simple temperature compensation could reduce temperature-induced errors in sensor output, and obtain desired pressure measurexnent accuracies. Engine tests performed with the present fiber optic sensors demonstrate good signalto-noise performance and temperature stability. ThITRODUCTIONCombustion pressure is the fundamental variable that determines the operating state of internal cornbustion engines. Real-time combustion pressure measurement can provide iuformatio n which leads to optimum control of engine speed, throttle, air/fuel ratio, gas recirculation and optimum response to ambient conditions . Closed-loop controls based on combustion pressure history enable engine operation at an opthnuin air/fuel ratio that results in significant improvement of fuel efficiency, and reduces emission levels of polluting gases2. Combustion pressure waveforms can be used to directly identify engine knock and misflre. Effective knock controLs and lean combustion become practical only if engine optimization is based on individual in-cylinder pressure information.The importance of combustion pressure for engine controls has long been recognized. Yet, practical applications have been largely limited due to lack of suitable pressure sensors that meet performance, cost, and size requirements. The major obstade in developing viable and stable combustion pressure sensors has been to overcome sensor performance degradation caused by adverse operating conditions, which include high combustion temperatures and strong electromagneti c interference (EMI). Extensive effort has been devoted to the development of piezoelectric-type combustion pressure sensors5. However, these sensors cannot operate at over 200°C without water cooling due to inherent material liinitat ions. In addition, signal conditioning electronics must usually be located near the sensor head in order to combat strong EMI and stray capacitance loading effects of electrical cables. This further complicates sensor design, and increases cost because of the need to compensate thermal drift in both sensor head and electronics.Fiber optic sensors prove themselves operationally viable in high temperature conditions. EMI immunity uniquely suits them in applications such as engine combustion pressure monitoring. Among various types of fiber optic pressure sensors reported6, the high cost and technical complexity of interferometric-type sensors prohibit their use in large scale commercia...

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Individual Cylinder Knock Control by Detecting Cylinder Pressure

Cited by 48 publications

References 4 publications

Engine performance monitoring using spark plug voltage analysis

Engine performance monitoring using spark plug voltage analysis

Cycle-by-Cycle Analysis, Knock Modeling and Spark-Advance Setting of a “Downsized” Spark-Ignition Turbocharged Engine

<title>High-temperature performance analysis of automotive combustion pressure sensor</title>

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