Control System for a Low Emissions Natural Gas Engine for Urban Vehicles

1991 ◽  
Author(s):  
A. D. Noble ◽  
A. J. Beaumont
Keyword(s):  
Control System ◽  
Natural Gas ◽  
Gas Engine ◽  
Natural Gas Engine

scholarly journals Micro-pilot-induced Ignition Diesel/ Natural Gas Engine Control System Development and Engine Performance /Emission Optimization

2018 ◽  
Author(s):  
G Zhao
Keyword(s):  
Control System ◽  
Natural Gas ◽  
Gas Injection ◽  
Injection Pressure ◽  
Dual Fuel ◽  
Injection Timing ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Driving Circuit ◽  
Injection Ratio

Diesel/natural gas dual fuel engine is acquiring more and more attention due to its potential to reduce NOX and soot emission simultaneously. Micro-pilot-induced diesel ignition natural gas engine is a popular manner to further improve the emission reduction capability of dual fuel engine. A six cylinder, four stroke, commonrail diesel engine is converted into dual fuel engine. Natural gas is injected into the intake manifold after the throttle. Five gas injection valves are used to control natural gas flow rate. Based to the established fuel supply system, a dual fuel control system is developed by using MS9S12XEP100 MCU. Voltage boosting circuit, fuel injector driving circuit, gas injection valve driving circuit and MeUn driving circuit are integrated on the platform of MCU hardware. Two ECU is connected to each other by CAN bus and several I/O ports to fulfil the fuel injection functional requirement. A software framework involves gas injection timing synchronization, fuel mode managing, multi-time injection. A MAP based fresh air mass flow rate and intake charge efficiency model is integrated in the MCU to calculate the fresh air quality in cylinder. The last part is performance optimization research at low load. Ignition diesel is divided into two stages, and the first injection timing, first injection ratio and injection pressure are used as controllable parameter to reduce NOX and HC emission. Experimental result reveal that by dividing ignition injection into two stage and advancing first injection to 60°CA BTDC CH4 emission can be reduced by 77% while NOX remains unchanged. Increasing the first injection ratio and injection pressure can also reduce THC emission. If injection pressure is higher than 75MPa, the effect of HC reduction effect is not that obvious. Experimental results shows that developed control system can accomplish the functional requirements of dual fuel engine management. Emission test results demonstrate that IMO TierII can be satisfied at diesel mode. DF mode emission performance can meet the requirement of IMO TierIII. Furthermore, as the first domestic product dual fuel dedicated control system, which has passed through the CCS authentication in China, the engine emission level can meet the current and upcoming China’s emission standard on non-road engine on the premise of guaranteeing engine power and economy.

Design and Development of Waukesha’s Stoichiometric, Cooled EGR Engine for the California ARICE Program

2005 ◽  
Author(s):  
Robert W. Stachowicz ◽  
David E. Watson ◽  
Donald M. Newburry ◽  
Timothy J. Callahan
Keyword(s):  
Control System ◽  
Natural Gas ◽  
Phase I ◽  
Phase Ii ◽  
Exhaust Gas ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Low Emission ◽  
Three Way Catalyst

Waukesha Engine, Dresser, Inc., (Waukesha) entered into a program with the California Energy Commission (CEC) to develop and demonstrate a 500 kWe ultra-low emission, Advanced Reciprocating Internal Combustion Engine (ARICE) for power generation. The purpose of the program was to demonstrate a natural gas fueled engine with emissions control technology that could achieve the following ARICE goals: • Reduce specified emissions by 90%; • Increase thermal efficiency by 10%; • Reduce installed costs of Distributed Generation (DG) systems by 10%; • Maintain engine durability. All changes are with respect to current levels defined at the time the program began. To work towards meeting these program goals Waukesha partnered with two primary subcontractors, Southwest Research Institute (SwRI) and MIRATECH Corporation. The program was originally defined in two phases. In Phase I Waukesha would develop and demonstrate a cooled EGR system. In Phase II further enhancements would be applied to the cooled EGR system with the intent of achieving still further gains in efficiency and reductions in emissions. A cooled Exhaust Gas Recirculation (EGR) system was installed on a base Waukesha H24GSI engine. The diluent properties of the EGR added to the stoichiometric fuel-air charge reduce peak cylinder combustion temperature. The lower combustion temperatures result in lower NOx values without the need for excess air which would yield oxygen in the exhaust gas. The lack of oxygen in the exhaust gas allows the use of an efficient, cost-effective, three-way catalyst (TWC) to reduce all three primary emittants — NOx, CO, and unburned hydrocarbons. This paper describes the Phase I design and development of an ultra-low emission, natural gas engine operating at stoichiometric conditions with cooled EGR and a TWC. Hardware modifications to incorporate the cooled EGR system on the base engine are covered. The TWC and control system developed are briefly described. The EGR engine with control system and three-way catalyst successfully completed a 500 hour durability test at SwRI. Stable control of the engine across the load range and acceptable load response by the unit have been demonstrated. Very low emissions of the three primary pollutants were measured downstream of the catalyst both before and after the 500 hours of durability testing. The phase I emissions goals were easily met. Emission levels near the Phase II goals were achieved. The Phase I engine efficiency was increased 12% and BMEP was increased 33% compared to the baseline engine. Examination of the engine and systems after the 500 hour run did not show signs of unusual wear or deposits. The potential for a cooled EGR system to produce significantly reduced NOx in a reciprocating natural gas engine was demonstrated. Remaining challenges include the demonstration of consistent, long term emissions performance and the long term durability of engine systems and components operating with EGR.

The Catalytic Challenges of Implementing a Euro VI Heavy Duty Emissions Control System for a Dedicated Lean Operating Natural Gas Engine

2018 ◽  
Vol 62 (1-4) ◽  
pp. 273-281 ◽  
Author(s):  
M. Keenan ◽  
R. Pickett ◽  
E. Tronconi ◽  
I. Nova ◽  
N. Kinnunen ◽  
...  
Keyword(s):  
Control System ◽  
Natural Gas ◽  
Heavy Duty ◽  
Emissions Control ◽  
Gas Engine ◽  
Natural Gas Engine

Measured and Predicted Performance of a Downsized, Medium Duty, Natural Gas Engine

2017 ◽  
Author(s):  
Robert Draper ◽  
Brendan Lenski ◽  
Franz-Joseph Foltz ◽  
Roderick Beazley ◽  
William Tenny
Keyword(s):  
Natural Gas ◽  
Gas Engine ◽  
Natural Gas Engine

Maintaining Low Exhaust Emissions With Turbocharged Gas Engines Using a Feedback Air–Fuel Ratio Control System

1987 ◽  
Vol 109 (4) ◽  
pp. 487-490 ◽  
Author(s):  
D. W. Eckard ◽  
J. V. Serve´
Keyword(s):  
Control System ◽  
Temperature Control ◽  
Exhaust Emissions ◽  
Ambient Conditions ◽  
Load Range ◽  
Heating Value ◽  
Gas Engine ◽  
Precise Control ◽  
Natural Gas Engine ◽  
Fuel Ratio

Maintaining low exhaust emissions on a turbocharged, natural gas engine through the speed and load range requires precise control of the air–fuel ratio. Changes in ambient conditions or fuel heating value will cause the air–fuel ratio to change substantially. By combining air–gas pressure with preturbine temperature control, the air–fuel ratio can be maintained regardless of changes in the ambient conditions or the fuel’s heating value. Design conditions and operating results are presented for an air–fuel controller for a turbocharged engine.

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