Sucking gas from liquid connector and feeding back to control vehicle refuelling fuel=air mixture - involves measuring pressure drop in feedback line, using difference between actual and demand vol. flow to control vol. flow.

摘要

The method involves generating count pulses in proportion to the delivered quantity of fuel. The press. drop across a section of the feedback line (7) is measured (12) to indicate the actual value of the feedback vol. flow. The count pulses are counted (16) continuously over defined time intervals and the digital value for a time period converted into an analogue demand value corresp. to the inverse function of the feedback vol. flow. The difference between the demand and actual values is used to adjust the feedback vol flow. USE/ADVANTAGE - The method and arrangement enable accurate matching of the feedback gas flow to the vol. flow rate of the delivered fuel during vehicle refuelling.