Masters Theses

Date of Award

5-1994

Degree Type

Thesis

Degree Name

Master of Science

Major

Mechanical Engineering

Major Professor

J.W. Hodgson

Committee Members

C. Wilson, J. Parsons

Abstract

This thesis project investigates the viability of creating a practical, low-cost conversion of a light-duty vehicle to dedicated natural gas service. The vehicle used in the study is a 1991 Saturn SL-1.

The paper focuses on three main aspects: installation of conversion hardware, use of an electronic controller to tailor engine performance, and measuring performance of the final vehicle.

The conversion hardware consists primarily of a single compressed natural gas tank with brackets; valves, tubing, a pressure regulator, fuel injectors, and other components to create a fuel delivery system. Engine conversion involves substitution of original pistons with "flat-top" pistons, raising the compression ratio to 11.0:1.

An aftermarket electronic engine controller with comprehensive software manages all basic engine functions using existing engine sensors and output devices. The OEM controller is left only non-engine tasks to perform.

Initial performance data reveal a 7% decrease in engine torque, but a vehicle highway range (at 3600 psig initial fill) of 250 miles. Further testing and evaluation of the conversion are recommended.

Download
Files over 3MB may be slow to open. For best results, right-click and select "save as..."

Share

COinS