Variable response time transient partial flow sampling system and method
AssigneeCaterpillar Inc.
InventorRussell R. Graze, Jr.
Life of this patent
Estimating the term…
Abstract
A partial flow dilution tunnel in a gas sampling system is connected to the exhaust from an internal combustion engine. More accurate gas sampling results are enabled for accounting for a delay from when the engine produces an exhaust change to when that transient arrives at a probe location. Thus, an estimated time delay is determined, and the gas sampling system is operated at least in part based upon that estimated time delay for the exhaust to arrive at the sampling location.
Claims20
A method of operating a partial gas sampling system, comprising the steps of:
- estimating a time delay for exhaust to arrive at a sampling area of an exhaust stack;
- setting a proportion of dilution to exhaust sample for the partial gas sampling system at least partially based upon the estimated time delay.
A gas sampling system comprising:
- an exhaust stack section;
- a dilution sampling probe positioned in the exhaust stack section;
- a controller operably coupled to control a proportionality of dilution to exhaust sample;
- and
- a computer in control communication with the controller, and including a control algorithm that includes a time delay estimation algorithm operable to determine a delay time for exhaust to arrive at the dilution sampling probe.
A gas sampling system comprising:
- an exhaust stack section;
- a sampling probe positioned in the exhaust stack section;
- a controller operably coupled to control a proportionality of dilution to exhaust sample;
- a computer in control communication with the controller, and including a control algorithm that includes a time delay estimation algorithm operable to determine a delay time for exhaust to arrive at the sampling probe;
- and
- the control algorithm includes means for determining an exhaust volumetric flow rate.
A gas sampling system comprising:
- an exhaust stack section;
- a sampling probe positioned in the exhaust stack section;
- a controller operably coupled to control a proportionality of dilution to exhaust sample;
- a computer in control communication with the controller, and including a control algorithm that includes a time delay estimation algorithm operable to determine a delay time for exhaust to arrive at the sampling probe;
- a transient sensor positioned in the exhaust stack, and being in communication with the computer;
- and
- the control algorithm includes a time delay estimation adjustment algorithm operable to compare an estimated time delay to a sensed time delay for an exhaust transient to arrive at the transient sensor.
Dependencies are inferred from the claim text.