Method for controlling glow plug ignition in a preheater of a hydrocarbon reformer

Abstract

A method for controlling a glow plug at a desired temperature. In a glow plug off state, the glow plug temperature status is monitored to prepare for the next combustion event. When ignition is requested, a determination is made as to how long full voltage can be applied to bring the glow plug to ignition temperature. A resistance/temperature map is provided to determine the resistance as a function of temperature. Another map is provided of temperature as a function of powering time at a full battery voltage in a First Heating Phase to ensure that the surface temperature of the glow plug will reach a predetermined temperature required to start combustion of an air/fuel mixture. A third map is provided of a PWM duty cycle for a Second Heating Phase to maintain the temperature of the glow plug to ensure flame propagation without damage to the glow plug.

Dependencies are inferred from the claim text.