The Design and Development of a Dedicated Propane Fuel System for the General Motors Medium Duty Truck 981921
A dedicated closed-loop propane fuel system has been developed for the General Motors Medium Duty truck with a 7.4 liter engine. The fuel metering system consists of a closed-loop controlled regulator and mixer. Regulator output pressure is controlled by a pulse-width modulated vacuum signal from the mixer for off-idle operation. Idle fuel is provided by an electronically controlled, fuel metering solenoid valve. Additionally, original equipment manufacturer (OEM) fail-safe performance of the Electronic Throttle Control system has also been achieved. This fuel system is an example of how an open loop regulator-mixer system can be enhanced with electronic controls to achieve significant improvements in emission signature, driveability, and customer satisfaction.
Citation: Jensen, B., Oprea, R., Westerdale, T., and Hussain, S., "The Design and Development of a Dedicated Propane Fuel System for the General Motors Medium Duty Truck," SAE Technical Paper 981921, 1998, https://doi.org/10.4271/981921. Download Citation
Bryan Jensen, Radu Oprea, Timothy Westerdale, Syed Hussain