Behaviour of a Closed Loop Controlled Air Valve Type Mixer on a Natural Gas Fuelled Engine Under Transient Operation

Jääskeläinen, Hannu E.; Wallace, James S.

doi:10.4271/951911

Cited by 2 publications

(8 citation statements)

References 6 publications

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“…Total hydrocarbon emissions remained the same with both open and closed loop control [2]. This form of natural gas control system does not respond well to transient conditions [4]. An important parameter within the controller is the gain value.…”

Section: Control Systems For Ic Enginesmentioning

confidence: 98%

“…This value must be optimized for both steady state conditions and rate of recovery from any disturbances to the signal. It should be noted that the controller's gain is not constant through transient conditions [4]. Although it has been demonstrated that closed loop controllers can be applied to natural gas with adequate performance, a significant drawback can be found in the variation of composition.…”

Section: Control Systems For Ic Enginesmentioning

confidence: 99%

“…Natural gas fuel control systems are usually the basis for biogas fueling. When altering engines to run on natural gas, most aftermarket conversion systems are mechanical devices with an oxygen sensor placed in closed loop control [2], [4]. Conversion systems traditionally consist of an air-valve type mixer, three stages of pressure regulation and a closed loop fuel control system using the original oxygen sensor.…”

Section: Biogas Fuelling Of Enginesmentioning

confidence: 99%

“…Conversion systems traditionally consist of an air-valve type mixer, three stages of pressure regulation and a closed loop fuel control system using the original oxygen sensor. Closed loop control was achieved by an integral controller using the oxygen sensor output [4]. This system works when the controller regulates the reference pressure into the pressure regulator via a solenoid; this varies the amount of NG supplied.…”

Section: Biogas Fuelling Of Enginesmentioning

confidence: 99%

“…This system works when the controller regulates the reference pressure into the pressure regulator via a solenoid; this varies the amount of NG supplied. By controlling the duty cycle signal supplied to the solenoid, the reference pressure can be altered [4].…”

Section: Biogas Fuelling Of Enginesmentioning

confidence: 99%

See 4 more Smart Citations

Achieving Low Emissions From a Biogas Fueled SI Engine Using a Catalytic Converter

Tadrous

Wallace

2012

ASME 2012 Internal Combustion Engine Division Fall Technical Conference

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Utilization of biogas is attractive from a greenhouse gas standpoint since it is carbon neutral due to the use of renewable resources. One source of biogas is anaerobic digestors. The biogas produced could be used to power IC engine-generator sets to produce electric power and heat on farms and in rural and northern communities. Use of local energy sources is particularly attractive in remote regions where liquid fuels must be shipped in via difficult terrain. Whatever the fuel, the engine must meet stringent exhaust emission standards. Biogas is typically used in spark ignition engines, where stoichiometric engine operation coupled to a three-way catalyst is a proven technology for achieving low emissions. An appropriate three-way catalyst was selected on the basis of tests with natural gas. A flow mixing system was used to create simulated biogas mixtures consisting of varying concentrations of methane, carbon dioxide, hydrogen and nitrogen. The effectiveness of the catalyst in achieving low emissions when the engine was fueled by the various simulated biogas mixtures was assessed.

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Section: Control Systems For Ic Enginesmentioning

confidence: 98%

Section: Control Systems For Ic Enginesmentioning

confidence: 99%