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Strategies for improving the mode transition in a sequential parallel turbocharged automotive diesel engine

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Abstract

Parallel sequential turbocharging systems are able to operate in different modes, which are defined according to the turbochargers that simultaneously boost the engine, and are controlled by means of specific valves. In order to cover the full engine operating range, a smooth transition between turbocharging operating modes must be ensured. However, important disturbances affect both boost and exhaust pressure when shifting the operation mode, thus causing non-negligible torque oscillations. This paper presents different methods for smoothing such undesirable effects during mode transition. Strategies covering optimal synchronization of the control valves, control of the valves’ position, and correction of the injected fuel during the transition are analysed. A fully instrumented passenger car engine is used for illustrating the different torque smoothing methods, and experimental results for transitions during both steady operation and engine accelerations are shown.

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Abbreviations

1T:

engine operation mode with a single turbocharger

2T:

engine operation mode with two turbochargers

C1:

compressor of TC1

C2:

compressor of TC2

TC1:

turbocharger number 1

TC2:

turbocharger number 2

T1:

turbine of TC1

T2:

turbine of TC2

VC2:

control valve of C2

VGT:

variable geometry turbine

Vrecirc:

valve of the recirculation circuit

VT2:

control valve of T2

WG:

waste-gate

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Authors and Affiliations

  1. CMT Motores Térmicos, Universidad Politécnica de Valencia, Camino de Vera s/n, Valencia, 46022, Spain

    J. Galindo, H. Climent, C. Guardiola & J. Doménech

Authors
  1. J. Galindo
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  2. H. Climent
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  3. C. Guardiola
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  4. J. Doménech
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Corresponding author

Correspondence to C. Guardiola.

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Galindo, J., Climent, H., Guardiola, C. et al. Strategies for improving the mode transition in a sequential parallel turbocharged automotive diesel engine. Int.J Automot. Technol. 10, 141–149 (2009). https://doi.org/10.1007/s12239-009-0017-1

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  • DOI: https://doi.org/10.1007/s12239-009-0017-1

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