New Modular Engine Platform from Volvo

Crabb, Derek; Fleiss, Michael; Larsson, Jan-Erik; Somhorst, Joop

doi:10.1007/s38313-013-0081-9

Cited by 26 publications

(12 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is a significant reduction; typical motored friction losses for a modern LD CI engine, running at 1500-3000 r/min, range from 0.5 to 0.9 bar. 15 To summarize, a high surface roughness counteracts the positive effect of the TBCs on the motored losses. Soot deposits appear to be an effective insulator, which has been shown in the literature, 16,17 but has not been quantified and presented in this way before.…”

Section: Motored Lossesmentioning

confidence: 94%

Evaluation of thermal barrier coatings and surface roughness in a single-cylinder light-duty diesel engine

Somhorst

Oevermann

Bovo

et al. 2019

International Journal of Engine Research

Self Cite

View full text Add to dashboard Cite

The effect of two thermal barrier coatings and their surface roughness on heat transfer, combustion, and emissions has been investigated in a single-cylinder light-duty diesel engine. The evaluated thermal barrier coating materials were plasma-sprayed yttria-stabilized zirconia and hard anodized aluminum, which were applied on the piston top surface. The main tool for the investigation was cylinder pressure analysis of the high-pressure cycle, from which the apparent rate of heat release, indicated efficiency, and heat losses were derived. For verification of the calculated wall heat transfer, the heat flow to the piston cooling oil was measured as well. Application of thermal barrier coatings can influence engine operating conditions like charge temperature and ignition delay. Therefore, extra attention was paid to choosing stable and repeatable engine operating points. The experimental data were modeled using multiple linear regression to isolate the effects of the coatings and of the surface roughness. The results from this study show that high surface roughness leads to increased wall heat losses and a delayed combustion. However, these effects are less pronounced at lower engine loads and in the presence of soot deposits. Both thermal barrier coatings show a reduction of cycle-averaged wall heat losses, but no improvement in indicated efficiency. The surface roughness and thermal barrier coatings had a significant impact on the hydrocarbon emissions, especially for low-load engine operation, while their effect on the other exhaust emissions was relatively small.

show abstract

Section: Motored Lossesmentioning

confidence: 94%

Evaluation of thermal barrier coatings and surface roughness in a single-cylinder light-duty diesel engine

Somhorst

Oevermann

Bovo

et al. 2019

International Journal of Engine Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…The output in terms of sound pressure at occupant position i as the objective response, p i , can be synthesized in the frequency domain as a sum of all structure borne and airborne path contributions (and the residual) as: (1) where H SB and H AB are the structure borne and airborne acoustic transfer functions, respectively, and F the structure borne operating interface force, the acoustic volume velocity source and p res the residual (model error). As only airborne noise is of interest in this paper, Eq.…”

Section: Transfer Path Analysismentioning

confidence: 99%

“…a combination of a belt driven roots type supercharger and a turbo charger, is used for the top performance petrol engine to meet requirements on power and torque as well as fuel efficiency [1,2]. The supercharger provides boosting in the low engine speed range while a single large turbocharger, which is needed to meet peak power and torque requirements, operates from mid to top end engine speeds.…”

Section: Introductionmentioning

confidence: 99%

NVH Integration of Twin Charger Direct Injected Gasoline Engine

Shah¹,

Lennström²,

Sturesson³

et al. 2014

SAE Int. J. Passeng. Cars - Mech. Syst.

View full text Add to dashboard Cite

The refinement of powertrain induced noise and vibration is one of the most important tasks during the vehicle development process. It strongly influences the driving perception of the vehicle together with attributes like drivability and vehicle dynamics. The expectation on NVH refinement from the customer point of view is also continuously increasing, especially in the premium and luxury segments. The task of NVH refinement gets even more challenging when new powertrain technologies like downsizing and down-speeding are introduced to meet both market expectations and legal regulation on CO 2 emission reduction. In combination with shorter product development time, due to that the automotive OEMs have to put products faster to the market and which is driven by competition, the reduction of both hardware stages and number of builds in a given hardware stage leads to that NVH refinement becomes even more complex. To minimize the risk of failure, advanced or research projects need to be executed up front of the ordinary product development projects in order to address all new concepts and technologies. The created new knowledge due to these "front-loading" activities may result in new specifications and requirements with associated assessment methods. All of this needs to be used in the later product development projects in terms of benchmarking, specification of technical requirements including system and component requirement down-cascading, concept evaluation, selection and optimization using virtual and hardware methods and finally validation. To be able to close the loop, the feedback from the learnings during the development projects is transferred back into the specifications, standards and methods.In the newly developed VEA engine family at Volvo Car Group a twin charger boosting system, i.e. a combination of a belt driven roots type supercharger and a turbo charger, is used for the top performance petrol engine to meet requirements on power and torque as well as fuel efficiency [1,2]. The supercharger provides boosting in the low engine speed range while a single large turbocharger, which is needed to meet peak power and torque requirements, operates from mid to top end engine speeds. The concept of a belt driven supercharger has significant advantages in response time at lower engine speeds compared to a single large turbocharger as the transient response time, or turbo lag, depends on the exhaust gas projection into the turbine geometry and polar inertia of the turbocharger [3]. The supercharger is controlled by an electromagnetic clutch, which enables disengagement and hence improves the fuel economy at steady state driving conditions as well as at the mid to top speed ranges where the NVH Integration of Twin Charger Direct Injected Gasoline EngineAshish Shah, David Lennström, Per-Olof Sturesson, and William Easterling Volvo Car Group ABSTRACTThe increased focus and demands on the reduction of fuel consumption and CO 2 requires the automotive industry to develop and introduce new and more energy effici...

show abstract

“…An example of this flexibility is Volvo's new modular engine platform, in which four different SI engines with the same geometry are divided into separate power/torque configurations by means of different turbocharger systems. 6 However, although turbocharging and downsizing combination has been proven to be a potential trend for SI engines over the next decade, there are still some further challenges that must be addressed. An important direction of these is to optimize the gas exchange process to further improve a SI engine's performance.…”

Section: Introductionmentioning

confidence: 99%

Novel approaches to improve the gas exchange process of downsized turbocharged spark-ignition engines: A review

Akehurst

Brace

2015

International Journal of Engine Research

View full text Add to dashboard Cite

Engine downsizing, which is the use of a smaller engine that provides the power of a larger engine, is now considered a mega-trend for the internal combustion engine market. It is usually achieved using one or more boosting devices including a supercharger or a turbocharger. Although supercharging is beneficial for engine's transient response, turbocharging technology is more widely adopted considering its advantages in fuel efficiency. Compared to turbocharged compression ignition engines, turbocharged spark-ignition engines tend to be more challenging with respect to the gas exchange process mainly due to their higher pumping loss, the need for throttling and the fact that spark-ignition engines demand more controllability due to the mitigation of knock, particularly with regard to minimizing trapped residuals. These challenges encourage the entire gas exchange process of turbocharged spark-ignition engines to be regarded as a complete air management system instead of just looking at the boosting system in isolation. In addition, more research emphasis should be focused on novel approaches to improve the gas exchange process of downsized turbocharged spark-ignition engines because the refinement of the conventional technologies cannot provide continuous gains indefinitely and only innovative concept may improve the engine performance to meet the fuel efficiency target and the more stringent emission regulation in the future. This article will first briefly review knowledge of the current state of the art technologies that are in production as opposed to approaches that are currently only being investigated at a research level. Next, more novel methods of the gas exchange process are introduced to identify the improved synergies between the engine and the boosting machine. The major findings to improve the gas exchange process that emerge from this review comprise four aspects (depending on the location where the novel technologies are implemented) which are as follows: charge air pressurization/de-pressurization improvement, combustion efficiency enhancement within the chamber, valve event-associated development and exhaust system optimization. Although the interaction between these technologies on different aspects of the gas exchange process was found to be highly complex, the optimization or the combination of these technologies is anticipated to further improve a downsized turbocharged spark-ignition engine's performance.

show abstract

New Modular Engine Platform from Volvo

Cited by 26 publications

References 3 publications

Evaluation of thermal barrier coatings and surface roughness in a single-cylinder light-duty diesel engine

Evaluation of thermal barrier coatings and surface roughness in a single-cylinder light-duty diesel engine

NVH Integration of Twin Charger Direct Injected Gasoline Engine

Novel approaches to improve the gas exchange process of downsized turbocharged spark-ignition engines: A review

Contact Info

Product

Resources

About