Start of Injection Strategies for HCCI-combustion

Nordgren, Henrik; Hultqvist, Anders; Johansson, Bengt

doi:10.4271/2004-01-2990

Cited by 29 publications

(11 citation statements)

References 4 publications

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“…By advancing the injection timing the charge becomes more homogeneous and thus uniformly lean resulting in retarded combustion i.e., late start of main combustion. Similar effects have been reported in literature in the case of neat diesel fuelled HCCI operation also [31]. Hence, the overall combustion rate and phasing are significantly influenced by the injection timing of diesel in the biogas-diesel PPCCI mode.…”

Section: Resultssupporting

confidence: 73%

“…Further, retarding the injection timing gives less time for the injected diesel to be homogeneously prepared at the time of ignition. This heterogeneity of diesel helps in enhancing the combustion rate and in advancing the ignition [31]. It may be noted that with increase in charge temperature, injection timing of diesel had to be advanced in order to lower the combustion rate and obtain proper phasing.…”

Section: Best Injection Timing Of Dieselmentioning

confidence: 96%

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Comparison of the predominantly premixed charge compression ignition and the dual fuel modes of operation with biogas and diesel as fuels

Ibrahim

Narasimhan

Ramesh

2015

Energy

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Section: Resultssupporting

confidence: 73%

Section: Best Injection Timing Of Dieselmentioning

confidence: 96%

Comparison of the predominantly premixed charge compression ignition and the dual fuel modes of operation with biogas and diesel as fuels

Ibrahim

Narasimhan

Ramesh

2015

Energy

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“…One of the key applications of micro-hole EDM drilling is the fabrication of diesel fuel-injector spray holes, which usually utilizes a precision centerless ground wire electrode of about 125 µm in diameter, D, to drill a hole of 1 mm in depth, H, on the hardened tool steel workpiece. New diesel engine emission standards have driven the development of new homogeneous charge compression ignition (HCCI) combustion technology [1] and require smaller diameter (D < 100 µm) and deeper (H > 1 mm) micro-holes for better fuel atomization under high injection pressure [2]. The improvement of drilling time is one of the key technical challenges for EDM drilling of such high-aspect-ratio micro-holes [3].…”

Section: Introductionmentioning

confidence: 99%

Design and tuning of a fuzzy logic controller for micro-hole electrical discharge machining

Kao

Shih

2008

Journal of Manufacturing Processes

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“…Recent diesel injectors are designed to meet such regulations through their capability of delivering multiple injection events [1]. Nordgren et al [2] demonstrated low NOx emission levels for early injection timing and an increase of NOx at retarded injection timing in HCCI combustion. In addition, Nehmer and Reitz [3] studied the effect of injection strategy on soot and NOx formation in a diesel engine and demonstrated significant reductions of these emissions.…”

Section: Introductionmentioning

confidence: 99%

In Situ Injection Rate Measurement to Study Single and Split Injections in a Heavy-Duty Diesel Engine

Aljohani¹,

Houidi²,

Babayev³

et al. 2019

SAE Technical Paper Series

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The split injection strategy holds a potential for high pressure combustion engines. One advantage of such strategy is the capability to control the heat release rate, which also implies the use of multiple split-injections with relatively short dwell intervals. Most injection rate measurement techniques require installment of the injector on a dedicated test rig. However, these techniques fail to accurately reproduce real-engine operating conditions. Using the spray impingement method, this paper investigates the injection rate of a high flow-rate solenoid injector while being operated on the engine. The aim is to have an experimental configuration as similar as possible to the real engine in terms of the acoustics and the fuel temperature within the injection system. The assumption of spray force proportional to the spray momentum is used to measure the injection rate. The spray momentum is measured while the injector is mounted on the Volvo D13 engine and connected to the in-series fuel rail and pump. A high-natural-frequency piezoelectric pressure transducer is mounted perpendicularly at 4 mm from one of the nozzle holes. The injector and sensor are contained within a specially designed collector for the injected fuel, which is maintained at atmospheric pressure and temperature. Experiments with single injection are conducted varying the Duration of Injection (DOI) from 400 up to 2000 µs. The tests with split double-injections are conducted with fixed DOI of 500 µs while the dwell time are varied from 100 up to 1000 µs. All tests are performed at the rail pressures of 500, 1000, 1500 and 2000 bar while the engine is operated at 1200 rpm. Results show that the injection rate shape of single injections is highly dependent on the rail pressure profile. With double split-injections, the rate of the second injection as well as the total fuel mass injected increases when the dwell time is shortened. Short dwell intervals boost the fuel quantities as a result of the altered needle response. Long dwell time between two equally-long injections generate similar injection rates. The injector hydraulic delay was more pronounced when dwell time was kept long enough. Overall, higher injection pressure advances the effective start of injection while retarding the effective end of injection.

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Start of Injection Strategies for HCCI-combustion

Cited by 29 publications

References 4 publications

Comparison of the predominantly premixed charge compression ignition and the dual fuel modes of operation with biogas and diesel as fuels

Comparison of the predominantly premixed charge compression ignition and the dual fuel modes of operation with biogas and diesel as fuels

Design and tuning of a fuzzy logic controller for micro-hole electrical discharge machining

In Situ Injection Rate Measurement to Study Single and Split Injections in a Heavy-Duty Diesel Engine

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