Patent Number: 6,253,736

Title: Fuel injector nozzle assembly with feedback control

Abstract: An injector is provided which includes a nozzle valve element, a control volume, and an injection control valve for controlling fuel flow from the control volume so as to control nozzle valve movement. Importantly, the injector includes a nozzle valve lift detecting device for detecting nozzle valve lift and providing a nozzle valve element lift feedback signal. In addition, an injection control valve member movement detecting device may be provided for detecting movement of the injection control valve member into open and/or closed positions and generating a control valve member position feedback signal. One or both of the feedback signals may be used for adjusting the timing and/or rate of opening of the injection control valve thereby controlling the timing and/or rate of opening of the nozzle valve element to control the timing and/or rate of fuel injection of subsequent injection events. The nozzle valve element lift detecting device includes positioning the injection control valve for contact by the nozzle valve element and a piezoelectric element for generating the feedback signal. A control device is used to process the feedback signal and adjust control of the injection control valve to achieve reduced emissions.

Inventors: Crofts; John D. (Edinburgh, IN), Cavanagh; Mark S. (Columbus, IN), Savage; Howard S. (Columbus, IN)

Assignee: Cummins Engine Company, Inc.

International Classification: F02M 65/00 (20060101); F02M 59/46 (20060101); F02M 59/00 (20060101); F02M 47/02 (20060101); F02M 63/00 (20060101); F02M 037/04 ()

Expiration Date: 07/03/2018