The New Denso Common Rail Diesel Solenoid Injector
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THE NEW DENSO COMMON RAIL DIESEL SOLENOID INJECTOR The new G4S injector from Denso with a three-way valve function improves hydraulic efficiency, thus cutting fuel consumption by around 1 %. A 75 % reduction in moving masses results in significantly improved hydraulics. Due to its minimised leakage, the injector has considerably lower fuel cooling requirements and is significantly more robust in dealing with variations in diesel fuel qualities.
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www.autotechreview.com
26-10-2013 18:12:07
AUTHORS
SHUICHI MATSUMOTO is Director Diesel Injection Engineering Division at Denso Corporation in Kariya (Japan).
KENJI DATE is Manager at the Diesel Injection Engineering Division, Denso Corporation in Kariya (Japan).
TOORU TAGUCHI is Project Assistant Manager at the Diesel Injection Engineering Division, Denso Corporation in Kariya (Japan).
DR. OLAF ERIK HERRMANN is Team Leader Advanced Diesel Engine Management System at Denso International Europe in Wegberg (Germany).
INTRODUCTION
An increasing numbers of diesel engines will be sold worldwide, with growth especially in the emerging markets. On the other hand, extremely strict emission regulations and CO2 regulation need to be fulfilled in the developed countries. Therefore, the diesel injection equipment is required to realise higher fuel metering accuracies and to provide increased injection pressures to meet stricter emission and fuel consumption regulations, while realising higher specific engine performance. Engine makers and OEMs further require improved robustness against diversified market fuels, pressure maintenance characteristics in the idle stop system (ISS) and easy installation of the fuel injection equipment (FIE). One key component to meet these demands is the injector. Technically, it is possible with an in-production 3rd generation piezo injector G3P (generation 3 piezo) to fulfil the oncoming requirements [1]. However, the solenoid technology guarantees for high robustness, long lifetimes and cost optimisation. Thus, Denso has developed a new generation solenoid injector G4S (generation 4 solenoid) meeting the same performance as the G3P injector. The focus was on the development targets as mentioned in, ➊.
Thanks to its high actuation forces, the G3P injector realises a direct three-way valve, which can minimise switching leakage significantly. It is a disadvantage of conventional current in-production solenoid injectors, where high switching leakages plus clearance leakages cause waste of energy and fuel deterioration due to high local temperatures in the fuel return lines [2]. A breakthrough was required to the control valve structure [1] to accomplish zero clearance leakage using a solenoid actuator. In the new 4th generation solenoid injector, G4S, this could be achieved by a new three-way valve function. Compared to current solenoid injector (G3S, generation 3 solenoid) the overall hydraulic performance was improved [2]. Compared to G3P, thanks to simple solenoid technology, long lifetime
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