Continuous compressor recirculation to improve boost response and mitigate compressor surge in turbocharged gasoline engines

Ossareh, Hamid R.; Buckland, Julie; Janković, Mrdjan

doi:10.1109/acc.2016.7526161

Cited by 3 publications

(1 citation statement)

References 10 publications

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“…Under such circumstances, the most widespread solution for surge avoidance is the installation of a recirculation loop in which an antisurge valve (ASV) is opened when the compressor is getting close to the surge limit, thus connecting its inlet and outlet [27]. Besides, the ASV can be employed to mitigate boost spikes during load increase maneuvers at iso-engine speed, better known as tip-ins [28]. Nevertheless, it must be remarked that the use of this anti-surge control system is also associated with higher turbocharger production costs and additional calibration tasks to properly manage the ASV.…”

Section: Introductionmentioning

confidence: 99%

Compressor Surge Mitigation in Turbocharged Spark-Ignition Engines without an Anti-Surge Control System during Load-Decrease Operation

et al. 2022

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Automotive manufacturers are showing an increasing preference for hybrid powertrains based on advanced gasoline engines. The most extended solution to improve fuel economy in these engines consists in downsizing with direct injection, while turbocharging is required to compensate the consequent power loss. However, turbocharging is associated with different issues, such as compressor surge. It can appear during fast throttle closings (tip-outs), when the engine air flow is abruptly reduced. A usual strategy to manage this kind of maneuver is the installation of an anti-surge valve (ASV) that connects the compressor inlet and outlet when approaching the surge limit. In pursuit of cost reduction, the removal of the ASV system was assessed in this research. To this end, tip-outs without ASV were tested in a turbocharged gasoline engine equipped with a low-pressure EGR loop, and two strategies were analyzed: throttle closure optimization and reduction of the compressor inlet pressure through the intake flap (located upstream of the compressor to increase the EGR rate). The instantaneous compressor outlet pressure and its time derivative were used for surge detection. Experimental tip-outs without ASV revealed that applying a certain intake flap closing combined with an optimized throttle actuation led to a fast torque decrease, similar to that observed for the reference case with ASV, without compressor instabilities.

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Section: Introductionmentioning

confidence: 99%