DIESEL INJECTION SYSTEM WITH DUAL FLOW FUEL LINE, NAMELY TWO SYSTEM FLOW FUEL ROUTE

摘要

PROBLEM TO BE SOLVED: To provide a simple method for detecting fuel leak. SOLUTION: A double walled fuel line connects diesel fuel injectors in a common rail system. An inner line carries high pressure fuel from a fuel pump to the fuel injectors. Low pressure return fuel flows back through an outer fuel line which acts as a return line. The double walled fuel line reduces the number of separate pipe connections needed in the system and provides protection against loss of high pressure fuel from the system. Monitoring fuel pressure in the low pressure line allows a fuel pressure sensor to detect leaks in the system by comparing fuel pressure in the low pressure line against typical line pressure. Higher than normal pressure in the low pressure line indicates a leak in the high pressure line. Lower than normal pressure indicates a leak in the low pressure return line. COPYRIGHT: (C)2009,JPO&INPIT