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US 4,901,698 AGranted
Emission control system
AssigneeLos Angeles County Sanitation District
InventorVladimir A. Novy
Life of this patent
Estimating the term…
Abstract
A method is provided for the control of nitrogen oxide and carbon monoxide emissions from a digester gas engine by the injection of air immediately upstream of the intake valve to form a gradient charge in the combustion chamber having an incombustible portion adjacent the piston and a more concentrated combustible portion adjacent the spark plug, and by the calibration of the spark advance curve of the engine.
Claims16
A method for controlling nitrogen oxide emissions in the exhaust gas of a spark-ignition, Otto cycle internal combustion engine including:
- (A) at least one combustion chamber formed by a piston and a cylinder having intake and outlet valves;
- (B) intake manifold means for delivering a charge of fuel-air mixture through the intake valve to the combustion chamber;
- (C) mixing means connected to the intake manifold means and disposed upstream with respect to the intake valve for controlling the ratio of the fuel-air mixture;
- (D) spark ignition means for igniting the charge in the combustion chamber;
- and
- (E) spark timing means for advancing or retarding the timing of the ignition of the charge with respect to the position of the cylinder in the Otto cycle, the timing means being programmable to allow the timing to be varied with respect to incremental alterations in engine speed;
- the method comprising the steps of:
- (1) setting the engine to operate at a given engine speed within the operating range of the engine;
- (2) adjusting the spark timing to obtain a desired nitrogen oxide emission at that speed;
- (3) recording the required spark timing to obtain t desired nitrogen oxide emission at the speed;
- (4) repeating the above steps of setting, adjusting and recording over a plurality of engine operating speeds;
- and
- (5) programming the spark timing means based on the data recorded to produce the required spark timing for any given engine speed.
10 more elements
A method for controlling emissions in the exhaust gas of a spark-ignition, Otto cycle internal combustion engine including:
- (A) at least one combustion chamber formed by a piston and a cylinder having intake and outlet valves;
- (B) intake manifold means for delivering a charge of fuel-air mixture through the intake valve to the combustion chamber;
- (C) mixing means connected to the intake manifold means and disposed upstream with respect to the intake valve for controlling the ratio of the fuel-air mixture;
- (D) an air delivery means communicating with said intake manifold means and adjacent the upstream side of the intake valve;
- (E) air control means adapted to permit the adjustment of the amount of air delivered through the air delivery means;
- (F) spark ignition means for igniting the charge in the combustion chamber;
- and
- (G) spark timing means for advancing or retarding the timing of the ignition of the charge with respect to the position of the cylinder in the Otto cycle, the timing means being programmable to allow the timing to be varied with respect to incremental alterations in engine speed;
- the method comprising the steps of:
- (1) setting the engine to operate at a given engine speed within the operating range of the engine;
- (2) adjusting the spark timing to obtain a desired nitrogen oxide emission at that speed;
- (3) recording the required spark timing to obtain the desired nitrogen oxide emission at the speed;
- (4) repeating the above steps of setting, adjusting and recording over a plurality of engine operating speeds;
- and
- (5) programming the spark timing means based on the data recorded to produce the required spark timing for any given engine speed.
12 more elements
A gaseous fueled Otto cycle internal combustion engine comprising:
- (1) at least one combustion chamber formed by a piston and a cylinder having intake and outlet valves;
- (2) intake manifold means for delivering a charge of fuel-air mixture through the intake valve to the combustion chamber;
- (3) mixing means connected to the intake manifold means and disposed upstream with respect to the intake valve for controlling the ratio of the fuel-air mixture;
- (4) spark ignition means for igniting the charge in the combustion chamber;
- (5) an air delivery means communicating with said intake manifold means and adjacent the upstream side of the intake valve;
- (6) air control means adapted to permit the adjustment of the amount of air delivered through the air delivery means;
- (7) spark timing means for advancing or retarding the timing of the ignition of the charge with respect to the position of the cylinder in the Otto cycle;
- and
- (8) automatic programmable timing means for programming the spark timing means to vary the timing with respect to incremental alterations in engine speed to reduce nitrogen oxide emissions in the exhaust gas of the engine.
6 more elements
Dependencies are inferred from the claim text.