Method of staged activation for electronically actuated fuel injectors
First Claim
1. A method of fuel injection, comprising the steps of:
- providing a fuel injector having an electronically actuated valve that opens to permit flow of high pressure fluid into the injector to initiate injection when activated but is biased to close when deactivated to end injection;
determining a desired amount of fuel to be injected;
calculating an activation duration;
determining whether the activation duration corresponds to a transition zone of operation for the electronically actuated valve;
if within the transition zone then;
calculating a revised activation duration;
activating the electronically actuated valve;
deactivating the electronically actuated valve;
reactivating the electronically actuated valve forsaid revised activation duration; and
deactivating the electronically actuated valve atthe end of said revised activation duration;
if outside the transition zone then;
activating the electronically actuated valve forsaid activation duration; and
deactivating the electronically actuated valve atthe end of said activation duration.
1 Assignment
0 Petitions
Accused Products
Abstract
A staged activation logic is utilized in the transition zone of operation for a fuel injector having an electronically actuated valve that opens to permit flow of high pressure fluid into the injector to initiate injection when activated but is biased to close when deactivated to end injection. Many different types of injectors could potentially utilize the present invention, regardless of whether the high pressure fluid is a high pressure hydraulic actuation fluid or high pressure fuel. The transition zone of operation corresponds to that range of activation durations for the injector in which the electronically actuated valve experiences a bouncing phenomenon because the valve member bounces off of its stop and closes prematurely. If it is determined that the desired amount of fuel to be injected during the next cycle falls within the transition zone of operation, then a revised activation duration for the electronically actuated valve is calculated. The valve is then quickly activated and deactivated with a staging pulse to raise pressure within the injector before actually initiating the injection of fuel. After a brief deactivation period, the electronically actuated valve is actuated for the revised activation duration. If the originally calculated amount of fuel falls outside of the transition zone then the electronically actuated valve is activated in a conventional manner.
-
Citations
9 Claims
-
1. A method of fuel injection, comprising the steps of:
-
providing a fuel injector having an electronically actuated valve that opens to permit flow of high pressure fluid into the injector to initiate injection when activated but is biased to close when deactivated to end injection; determining a desired amount of fuel to be injected; calculating an activation duration; determining whether the activation duration corresponds to a transition zone of operation for the electronically actuated valve; if within the transition zone then; calculating a revised activation duration; activating the electronically actuated valve; deactivating the electronically actuated valve; reactivating the electronically actuated valve for said revised activation duration; and deactivating the electronically actuated valve at the end of said revised activation duration; if outside the transition zone then; activating the electronically actuated valve for said activation duration; and deactivating the electronically actuated valve at the end of said activation duration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
Specification