Abstract
Increasingly complex air path concepts are investigated to achieve a substantial reduction in fuel consumption while improving the vehicle dynamics. One promising technology is the two-stage turbocharging for gasoline engines, where a high pressure and a low pressure turbocharger are placed in series. For exploiting the high potential, a control concept has to be developed that allows for coordinated management of the two turbocharger stages. In this paper, the control strategy is investigated. Therefore, the effect of the actuated values on transient response and pumping losses is analyzed. Based on these findings, an optimization-based control algorithm is developed that allows taking both requirements into account. The developed new controller allows achieving a fast transient response, while at the same time reducing pumping losses in stationary operation.
Highlights
An innovative concept is developed that uses the over-actuation to find a trade-off between fast transient performance and reduction of pumping losses, in order to fully exploit the potential of the architecture
If we look at stationary operation, the following simplifications can be made: Pc,hp = Pt,hp and Pc,l p = Pt,l p, as well as ṁc,hp = ṁc,l p = ṁ asp, which leads to:
A control strategy is developed in this paper to cope with both requirements
Summary
The reduction of CO2 emissions is one of the main objectives for combustion engine development. Conventional turbocharger architectures consist of a single turbine and a single compressor, which are connected by a common shaft These single-stage turbocharging concepts exhibit inherent limitations on the transient load performance and the possibility to reduce fuel consumption for passenger vehicles. Large devices will enhance the specific power output and will reduce fuel consumption, especially at high engine speeds, whereas small devices will provide a fast torque response and improve the driveability of the vehicle, especially at low engine speeds. To overcome this trade-off, increasingly complex air path architectures are investigated, which cope with the severe requirements. The control strategy of two-stage turbocharging devices for gasoline engines is investigated
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