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Investigation of ‘Sweep’ Mapping Approach on Engine Testbed
Technical Paper
2002-01-0615
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Steady state mapping is fundamental to optimizing IC engine operation. Engine variables are set, a predefined settling time elapses, and then engine data are logged. This is an accurate but time consuming approach to engine testing. In contrast the sweep method seeks to speed up data capture by continuously moving the engine through its operating envelope without dwelling. This is facilitated by the enhanced capability of modern test rig control systems. The purpose of this work is to compare the accuracy and repeatability of the sweep approach under experimental conditions, with that of steady state testing.
Limiting factors for the accuracy of the sweep approach fall into two categories. Firstly on the instrumentation side - transducers have a characteristic settling time. Secondly on the engine side - thermal and mechanical inertias will mean that instantaneous measurements of engine parameters differ from the steady state values. These errors can be reduced to satisfactory levels by modelling the engine and instrumentation responses. Some data i.e. air, fuel and emissions pose significant problems, with the response time of the equipment limiting the maximum sweep speed.
Despite requiring intensive data processing and test bed sophistication, sweep mapping shows the potential to give accuracy comparable to steady state testing, but with much reduced mapping times.
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Citation
Ward, M., Brace, C., Vaughan, N., Ceen, R. et al., "Investigation of ‘Sweep’ Mapping Approach on Engine Testbed," SAE Technical Paper 2002-01-0615, 2002, https://doi.org/10.4271/2002-01-0615.Also In
References
- Gouldburn J. R. Brown D G. Case R. 1991 “Computer Controlled Non-Steady-State Engine Testing” Int. J. of Vehicle Design 12 1 1991
- CP Engineering 2000 “Cadet V12 - Run test Manual“
- CP Engineering 2000 “CP data Sheet - CP128 Control and Monitoring I/O system”
- ASAM 2000 “ASAM-ODS Ver 4.0” 2000 ASAM Group
- Mathworks “MATLAB online help” Mathworks
- Chevalier A. Mueller M. Hendricks E. “On the Validity of Mean Value Engine Models during Transient Operation” 2000 SAE Paper 2000-01-1261
- Nise N S. 1992 “Control Systems Engineering” Benjamin Cummings
- Bosch 1996 “Automotive Handbook” 4th Bosch
- Tektronix “Engine Analysis Measurements” 1970 Measurements Concepts Series - Tektronix