A Multiplex Communication System for Gaseous Fuel Control with Bi-Fuel On-Board Diagnostics 961983
A multiplex communication system has been developed for the Ford Alternative Fuel Qualified Vehicle Modifier (QVM) program, linking the vehicle's powertrain control module (PCM) to the alternative fuel (natural gas or propane) control module (AFCM). The system allows precalibrated diagnostic routines (OBD and non-OBD) to be selectively modified and disabled which otherwise would be affected by alternative fuel operation. The system enables the broadcasting of selected information from the PCM for use by the AFCM. An additional benefit is smoother transition between alternative fuel and gasoline operation when the gaseous fuel is depleted. Also, improved emissions on the alternative fuel have been noted due to the link. System development and function are detailed in this paper.
Citation: Lapetz, J., Kuechler, P., Zurawski, M., and Klein, R., "A Multiplex Communication System for Gaseous Fuel Control with Bi-Fuel On-Board Diagnostics," SAE Technical Paper 961983, 1996, https://doi.org/10.4271/961983. Download Citation
John Lapetz, Peter Kuechler, Mark Zurawski, Ralph Klein
Cosworth Intelligent Controls, Inc
1996 SAE International Fall Fuels and Lubricants Meeting and Exhibition
On- and Off-Board Diagnostics-PT-81, Topics in Alternative Fuels and Their Emissions-SP-1208