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Test Results: Ford PCM Downloads Compared to Instrumented Vehicle Response in High Slip Angle Turning and other Dynamic Maneuvers
Technical Paper
2009-01-0882
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
An instrumented 2005 Ford Explorer was used to evaluate speed data provided from its Powertrain Control Module (PCM) at high slip angles. PCM speed was compared to speed and slip angle collected from a calibrated Datron S-400 velocity sensor. In addition to speed, slip angle and other standard handling test measurements the vehicle brake switch and throttle were recorded so PCM data could be synchronized. After each test run the vehicle ignition was turned off and the PCM was downloaded using commercially available Bosch hardware and software. The principal maneuver was the National Highway Traffic Safety Administration (NHTSA) sine-with-dwell test consisting of a 0.7 HZ sinusoidal steer with a 0.5 second dwell at the steer reversal peak. Runs were conducted with the vehicle’s Electronic Stability Control (ESC) disengaged so that the test vehicle would achieve large slip angles. Other dynamic maneuvers included: NHTSA’s sine-with-dwell with ESC engaged; 100% accelerator to 80 mph with 0.5G braking to stop; and acceleration to 50 mph with maximum ABS braking to stop. Results demonstrate agreement between the speed recorded by the calibrated instrumentation and speed recorded by the vehicle’s PCM for conditions when the vehicle slip angle and rear wheel slip were near zero. PCM speed was lower than instrumented speed in high slip angle maneuvers. PCM on average under-reported during maximum ABS braking and at medium to high speed in 0.5G braking. In acceleration the PCM speed had no detectable under-reporting error except at the highest speeds with accelerator at 100%.
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Citation
Arndt, M., Rosenfield, M., Stevens, D., and Arndt, S., "Test Results: Ford PCM Downloads Compared to Instrumented Vehicle Response in High Slip Angle Turning and other Dynamic Maneuvers," SAE Technical Paper 2009-01-0882, 2009, https://doi.org/10.4271/2009-01-0882.Also In
References
- Ford Motor Co. January 19 2006 http://media.ford.com/article_display.cfm?article_id=20679
- Haus, J. 2002 “Slip Angle Measurement with an S-sensor and a yaw rate sensor,” Corrsys-Datron
- Neudecker, Frank June 25 2004 “The Influence of Signal Smoothing Filters on Brake Test Accuracy,” Corrsys-Datron
- National Highway Traffic Safety Administration September 2006 “Development of Electronic Stability Control (ESC) Performance Criteria,”
- Orlowski, K. March 1989 “Reconstruction of Rollover Collisions,” SAE 890857
- Martinez, E. 1996 “A Primer on the Reconstruction and Presentation of Rollover Accidents,” SAE 960647
- Lau, J. May 8 2008
- Ruth, R. 2008 Spring “Dynamic accuracy of Powertrain Control Module (PCM) Event Data Recorders During ABS Braking,” Collision 44 47
- Ruest, T. 2008 Spring “The Accuracy of Speed recorded by a Ford PCM and the Effect of Brake, Yaw and Other Factors,” Collision 48 51 58 59