Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1997-12-12
1999-09-21
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
Fuel injection system
123198DB, F02M 4100
Patent
active
059540320
ABSTRACT:
A control for an injection system of a multicylinder internal combustion engine has a high pressure pump connected to a distributor element provided with outlet openings from which branch lines lead separately to groups of injection valves. The distributor element has first and second spring biased pistons that are operable to block selectively fuel to the branch lines, each of the pistons having a throttle point situated therein. When a major leak develops downstream from the distributor element, the branch line in which the leak has occurred is automatically shut off by the associated piston in the distributor element, due to the imbalance in pressure which results. When a minor leak develops, one of the branch lines is automatically closed by a control unit shutting off the injection valves associated with the other branch line, while the high pressure pump continues to deliver for at least one operating cycle. The other branch line and associate injection valves operate once again, with an adjustment of the fuel volume supplied when elimination of the leak is detected. When, however, it is determined that the leak still exists, injection valves that have been shut off are activated once again without delivering new fuel, and one branch line and associated injection valves continues to operate while adjusting the amount of fuel delivered.
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Augustin Ulrich
Fraenkle Gerhard
Schimmeyer Claus-Juergen
Daimler-Chrysler AG
Moulis Thomas N.
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