Dr.-Ing. Joachim Schommers's research while affiliated with Daimler and other places
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Publications (18)
With the OM 642 engine, Mercedes-Benz engineers have developed a high-quality, highly compact V6 passenger car diesel engine which, thanks to its conception and design, now replaces the previous 5- and 6-cylinder in-line engines in all vehicle model series. Its compact design also means that a 6-cylinder diesel engine can now be used in the C-Class...
Following a successful optimisation programme lasting several years for the previous four-cylinder diesel engine whose basic dimensions are still based on the OM 601 prechamber natural aspirated engine of the year 1983, Mercedes-Benz has developed a completely new engine, bearing the internal designation OM 651, to production maturity. The potentia...
Mercedes-Benz hat nach langjähriger erfolgreicher Optimierung des bisherigen Vierzylinder-Dieselmotors, dessen Grundabmessungen noch auf dem Vorkammer-Saugmotor OM 601 aus dem Jahr 1983 beruhen, einen komplett neuen Motor mit der internen Bezeichnung OM 651 zur Serienreife entwickelt. Die Potenziale dieses Motors bezüglich Verbrauch, Emissionen und...
In October 2006 when Mercedes-Benz introduced the model E 320 Bluetec, it brought the first production diesel passenger car to the market that met US Tier 2 Bin8 emission standards. Mercedes-Benz will continue its Bluetec offensive in 2008, offering the V6 diesel engine in the M, GL and R Classes in the USA, using the SCR/AdBlue technology which me...
Im Oktober 2006 hat Mercedes-Benz mit der Markteinführung des E-Klasse-Modells E 320 Bluetec in den USA den ersten Serien-Pkw mit Dieselmotor auf den Markt gebracht, der die US-Tier-2-Bin8-Abgasgrenzwerte erreicht hat. Noch im Jahr 2008 wird Mercedes-Benz die „Bluetec“-Offensive fortführen und den V6-Dieselmotor in der M-, GL- und R-Klasse in den U...
Mercedes-Benz hat in den vergangenen Jahren Meilensteine in der Emissionsentwicklung von Dieselmotoren erreicht: 1985 den weltweit ersten serienmäßigen Partikelfilter im Pkw, 2003 den ersten modernen Partikelfilter mit additivfreier Regeneration und im Oktober 2006 die Markteinführung des E 320 Bluetec in den USA. Dieses Fahrzeug unterschreitet als...
Der bewährte Vierzylinder-Dieselmotor von Mercedes-Benz war in den vergangenen Jahren unter anderem in den Mittelklasse-Limousinen der C- und E-Klasse eine gefragte Einstiegsmotorisierung. Parallel zur Modellpflege der E-Klasse und in Vorbereitung zur neuen C-Klasse wurde der vorhandene Motor hinsichtlich Leistung und Drehmoment nochmals aufgewerte...
Mit dem neuen V8-Dieselmotor des E420 CDI (OM 629) stellt Mercedes-Benz einen Motor vor, der durch konsequente Optimierung hervorragende spezifische Werte in seiner Klasse erreicht und trotz des im Vergleich zum Wettbewerb geringeren Hubraums von 4,0 l einen ausgewogenen, kraftvollen Gesamtantrieb darstellt. Er wird ausschließlich in der Euro-4-Aus...
Für das Gemeinschaftsprojekt Smart Forfour und Mitsubishi Colt entwickelte Mercedes-Benz aus einem Vierzylinder-Dieselmotor der A-Klasse eine Dreizylindervariante. Dieser Dieselmotor ermöglicht sehr gute Fahrleistungen bei niedrigem Kraftstoffverbrauch. Die Topvariante mit 70 kW markiert derzeit den leistungsstärksten Dreizylinder-Pkw-Dieselmotor d...
Mit dem neuen V6- Dieselmotor für Pkw — interne Bezeichnung OM 642 — entwickelten die Mercedes-Benz-Ingenieure ein anspruchsvolles und hochkompaktes Aggregat, das aufgrund seiner Konzeption und Gestaltung die bisher eingesetzten Fünf- und Sechszylinder-Reihenmotoren in allen Fahrzeugbaureihen ersetzt. Die kompakte Gestaltung ermöglicht zudem erstma...
Die Entwicklungsziele des neuen Mercedes-Benz Zwölfzylindermotors sind nicht nur in Bezug auf die Fahrleistungen und den Komfort, sondern auch hinsichtlich des Kraftstoffverbrauches und der Emissionen besonders hoch gesteckt. Dies spiegelt sich insbesondere im hier vorliegenden zweiten Teil wieder, in dem die wesentlichen verbrennungsseitigen Kompo...
Für die neue Mercedes-Benz S-Klasse sowie das Coupé CL wurde ein völlig neuer Zwölfzylindermotor entwickelt. Er ist so gestaltet, dass der klassische Konflikt zwischen Fahrleistung und Komfort einerseits sowie Kraftstoffverbrauch und Emissionen andererseits optimal aufgelöst wird.
Der vorliegende erste Teil des Berichts beschreibt das Grundkonzept...
Citations
... This rotational speed is approximately the average speed of such four-cylinder diesel engines [15,38]. The length of connecting rod (l) is 0.148 m and the crank length (α) is 0.048 m [39]. The piston's material density (ρP) is 2700 kg/m 3 and the piston's characteristic height (Y) is 0.055 m [39]. ...
... In recent years, many researchers utilized this method, like what V.P. Singh et al. have done in 2011 to evaluate the wear characteristics of plasma sprayed nanostructured WC -Co coatings [4]. On the other hand Mercedes Benz has introduced his new diesel engine OM 642 LS in 2010 which used APS coating to enhance wear characteristics of its cylinders, consequently increase the efficiency [5]. Evaluation of plasma sprayed Al 2 O 3 -12%wt. ...
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... Losses associated with friction processes have a significant impact on fuel consumption and harmful emissions for the environment, as is the case of CO 2 [5,6]. The friction losses present in the piston assembly can represent approximately 50% of the total friction losses in ICEs [7]. Much of this percentage of losses is located in the piston ring package [8]. ...
... Global product development strategies introduced new challenges in the automotive industry. The increasing demand for high efficiency, low emission powertrains and the diversity of use scenarios and fuel quality pose higher mechanical, thermal and tribological loads on the cylinder wall of an internal combustion engine [1][2][3]. With a broadening market for hybrid powertrains there is a rising need for cost-effective, low friction wear resistant cylinder surfaces [1,2]. ...
... [38] und [39] beschrieben. Ein Injektor mit direkter Nadelsteuerung für den Serieneinsatz wird in [40] und [41] beschrieben. ...
... Kumar et al. 2007) to a speed-controlled engine, with internal firstorder dynamics to take combustion dynamics into account (Tsai and Goyal 1986). A steady-state map of the Brake Specific Fuel Consumption (BSFC, Digeser et al. 2005) is used to determine torque limitations (wide open throttle curve) and fuel consumption based on the current operating conditions. The inertia of the engine's moving parts and flywheel is modelled as lumped inertia on the pump component. ...
... In recent years, a multitude of different concepts for realizing an engine operating point shift have been developed and implemented in series applications for both gasoline and diesel engines. In most cases, the objective is to use more efficient operating regions of the engine map and, therefore, improve fuel consumption [1]; in some cases, the focus is also on increasing the exhaust gas temperature to heat up or maintain the temperature of the exhaust aftertreatment system, especially for diesel engines [2,3]. Besides classic "downsizing" or "downspeeding" approaches on the one hand and complex operating strategies in hybrid concepts on the other, such an operating point shift can also be achieved by so-called "dynamic downsizing", i.e. the deactivation of one or more cylinders of a multi-cylinder engine depending on the operating point. ...
... Honda states that their 2014 model of 1.6 litre diesel engine weighs 160 kg and can output 88 kW, giving it a power-to-weight ratio of 0.55 kW/kg [43]. The 2005 Mercedes OM642 is stated to weigh 208 kg at a power rating of 173 kW, resulting in a power-to-weight-ratio of 0.83 kW/kg [44]. In 2011, the engine was improved to output 195 kW, but no weight is mentioned [45]. ...
... Also remarkable is the publication by Schommers et al. [85] where the layout of a 5 year old production engine is redesigned and equipped with an injection system from a different supplier in this process. Nonetheless, the number of orifices in the nozzle remains unchanged. ...
