US 9,810,163 B2
Multiple element firing strategy for cryogenic pump
Joshua W. Steffen, El Paso, IL (US); and Sunil J. Bean, Peoria, IL (US)
Assigned to Caterpillar Inc., Peoria, IL (US)
Filed by Caterpillar Inc., Peoria, IL (US)
Filed on Jun. 29, 2015, as Appl. No. 14/753,613.
Prior Publication US 2016/0377041 A1, Dec. 29, 2016
Int. Cl. F02D 19/06 (2006.01); F02D 19/10 (2006.01); F02D 41/38 (2006.01); F02D 41/00 (2006.01)
CPC F02D 19/0644 (2013.01) [F02D 19/0684 (2013.01); F02D 19/10 (2013.01); F02D 41/0027 (2013.01); F02D 41/3845 (2013.01); F02D 19/0694 (2013.01); F02D 2041/3881 (2013.01); F02D 2200/0602 (2013.01); Y02T 10/36 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A fluid system, comprising:
a pump having a plurality of pumping elements, each of the plurality of pumping elements being independently responsive to a corresponding actuation signal to perform a pumping stroke that delivers a pumped amount of fluid at a pump discharge;
a pressure sensor disposed to monitor a fluid pressure at the pump discharge and provide a pressure signal;
an electronic controller associated with the pump and the pressure sensor, the electronic controller disposed to receive the pressure signal and provide the corresponding actuation signal to each of the plurality of pumping elements, the electronic controller being further programmed to maintain a desired pressure at the pump discharge, the electronic controller being programmed to:
monitor the fluid pressure provided by the pressure sensor;
compare the fluid pressure with the desired pressure to determine a pressure error;
provide commands to sequentially actuate the plurality of pumping elements when the pressure error is within a threshold range; and
provide commands to actuate more than one of the plurality of pumping elements simultaneously, such that more than one pumped amounts of fluid are delivered simultaneously at the pump discharge, when the pressure error droops outside of the threshold range.