Search Results

A production hybrid-electric vehicle with gasoline internal combustion engine (ICE) has been modified to operate on hydrogen fuel and to demonstrate an advanced metal hydride fuel storage system. Fuel economy, range, performance, and emissions of the modified vehicle are similar to levels achieved with current fuel cell vehicles. This project was conceived and executed by Energy Conversion Devices, Inc. All vehicle modifications, engine and chassis dynamometer tests, and road tests were performed by Quantum Technologies, Inc. at their Lake Forest, CA facility. Project activities and test results are chronicled in this paper.

A CNG bi-fuel version of the Chevrolet Cavalier has been developed as an OEM (Original Equipment Manufacturer) vehicle. The fuel management system is an automatically switching bi-fuel system which is able to control fuel flow rate, spark timing, EGR, and perform OBD-II (On-Board Diagnostics II). The system consists of a CNG fuel tank, fuel filter, electric and manual fuel shutoff valves, high and low pressure regulators, gas mass sensor, mixture control valve, gas distribution system, CNG fuel gauge, OEM exhaust gas oxygen sensor, digital engine control unit (ECU), OEM powertrain control module (PCM) and unique wiring harness. This paper discusses the components, operation, and calibration of the CNG bi-fuel management system. A computer engine simulation model able to predict engine performance, fuel economy, and exhaust emissions, was used to assist spark, fuel, and EGR table mapping.