Exhaust heating control.

摘要

The method involves providing for combustion in the heater by setting a desired air quantity to a predetermined lighting air quantity and by setting a desired heater air/fuel ratio to a predetermined lighting air/fuel ratio. and providing for a rapid increase in heater energy output upon sensing combustion in the heater by setting the desired air quantity to a predetermined ramp air quantity and setting the desired heater air/fuel ratio to a predetermined ramp air/fuel ratio. The commanded air quantity is adjusted in accord with the set desired air quantity, and the commanded fuel vapour quantity is adjusted in accord with the set desired heater air/fuel ratio and a predetermined one of the set desired air quantity and the adjusted commanded air quantity. Engine exhaust gas temp. is stabilised when heater output energy is estimated to have reached the predetermined maximum output.