US 10,094,306 B2Granted

Nonlinear model-based controller for premixed charge compression ignition combustion timing in diesel engines

AssigneePurdue Research Foundation

InventorsGregory M. Shaver, Lyle E. Kocher, Carrie Hall, Daniel Van Alstine, Mark Magee

Life of this patent

Estimating the term…

Loading patent…

Abstract

Advanced combustion modes, such as PCCI, operate near the system stability limits. In PCCI, the combustion event begins without a direct combustion trigger in contrast to traditional spark-ignited gasoline engines and direct-injected diesel engines. The lack of a direct combustion trigger encourages the usage of model-based controls to provide robust control of the combustion phasing. The nonlinear relationships between the control inputs and the combustion system response often limit the effectiveness of traditional, non-model-based controllers. Accurate knowledge of the system states and inputs is helpful for implementation of an effective nonlinear controller. A nonlinear controller is developed and implemented to control the engine combustion timing during diesel PCCI operation by targeting desired values of the in-cylinder oxygen concentration, pressure, and temperature during early fuel injection.

Claims39

Dependent claims

A method of operating a charge compression ignition internal combustion engine, comprising:

operating diesel engine having at least one cylinder including a reciprocating piston coupled to a rotating crankshaft, an intake manifold for providing ambient air through a variable intake valve actuation system, a fuel injector for injecting fuel into the cylinder;
an exhaust gas recirculation system providing recirculated exhaust gas to the intake manifold, and an electronic controller operably connected to the exhaust gas recirculation system, to the valve actuation system, and to fuel injector;
inducting a charge into the cylinder from the intake manifold of ambient air through the variable intake valve actuation system and recirculated exhaust gas;
determining a quantity of free oxygen in the charge;
and
varying the flow characteristics of the variable intake valve actuation system in response to the quantity of free oxygen in the charge to achieve a predetermined quantity of oxygen in the cylinder.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/651,521Filed 12 Dec 2013 · us provisional application
Priority: 12 Dec 2012
Published: US 2015/0330326 A119 Nov 2015
Granted: 9 Oct 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification28 codes

F02D 35/02
Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for: on interior conditions
F02B 1/12
Engines characterised by fuel-air mixture compression: with compression ignition
F02D 13/0226
Variable control of the intake valves only: changing valve lift or valve lift and timing
F02D 13/0265
Controlling the valve overlap: negative valve overlap for temporarily storing residual gas in the cylinder