Delphi introduces new diesel fuel pumps
Delphi Corp. will display a selection of new sensors and high-efficiency brushless fuel pumps that help reduce the cost and improve the fuel efficiency of next-generation, ultra low emissions diesel engines at this week's SAE World Congress. The latest innovations follow the recent successful introduction of the company's award-winning Direct Acting Diesel Common Rail System, providing a broad portfolio of technologies that help improve the efficiency, cost and emissions performance of diesel engines of all sizes.
“Downsizing and reductions in parasitic losses are established strategies for reducing emissions and fuel consumption that Delphi is supporting with a range of solutions,” said Diesel Systems Engineering Deputy Director Philippe Bercher. “But to keep diesel competitive, we have to also look at reducing costs in areas such as On-Board Diagnostics (OBD), where evolving standards are introducing new layers of cost and complexity. At the SAE World Congress, we are previewing new technologies that will help to minimize the cost and packaging impact of developments in global homologation requirements.”
New particulate matter sensor to monitor the performance of diesel particulate filters
Soot, or particulate matter, created during the combustion process is treated in the exhaust stream by a diesel particulate filter (DPF). At the SAE World Congress, Delphi is showcasing an affordable new sensor that monitors the performance of the DPF as required by increasingly rigorous standards for On Board Diagnostics (OBD). The result of a two-year development program, the new sensor uses resistive techniques to measure levels of soot in the exhaust stream after the DPF, allowing an OBD alarm to be raised when a predetermined threshold is exceeded.
“We have leveraged our expertise in exhaust sensor competencies and ceramics to develop this technical innovation which will help OEMs not only comply with tough emissions regulations but also reduce the impact of OBD costs associated with them,” explained Scott Nelson, staff research engineer advanced exhaust sensors, Delphi Powertrain Systems.
“It's an economical solution combined with proven durability and low complexity. The technology used in the sensing element, allows us to package the sensor in our production small sensor housing which is about half the size of a conventional sensor. Fast response and high sensitivity, along with simple sensor self diagnostics techniques make the sensor desirable for both light-duty and heavy-duty applications,” continued Nelson.
Two varieties of particulate matter sensors are under development, specifically optimized for automotive and heavy-duty applications. Additionally, Delphi provides the capability for diesel particulate filter monitoring through the use of a differential pressure sensor.
New ammonia sensor eliminates the need for expensive post-oxidation catalyst
Selective catalytic reduction (SCR) aftertreatment is becoming an increasingly popular choice for NOx control to help manufacturers meet diesel engine emissions requirements. And, the need for precise control of urea — an ammonia rich compound required by the SCR system — is expected to rapidly increase to meet demanding new emissions regulations. Delphi's ammonia sensor is the first technology that allows direct closed-loop control of the SCR process, permitting the amount of urea injected into the exhaust stream to be optimized in an automotive application. A second key function of the sensor is to provide on-board diagnostic information for the SCR system.
Control of urea injection is expected to become a rapidly increasing priority as SCR use increases to meet demanding new emissions regulations. Delphi's new ammonia sensor is intended for use in diesel vehicles equipped with an SCR system, including light-duty, medium-duty and heavy-duty diesel vehicles. It helps enable the SCR system to work at greater NOx conversion efficiencies, which allows the engine to operate with higher fuel efficiency while helping the vehicle meet new tailpipe NOx standards. It also provides manufacturers with the flexibility to reduce or eliminate an expensive post-oxidation catalyst that would otherwise be needed to remove excess ammonia from the exhaust and to help enable the size of the SCR converter to be optimized.
Reduced power consumption with Delphi's compact new brushless fuel pump
Delphi is also introducing a new fuel pump, using a next-generation brushless motor architecture providing high efficiency, improved durability and compatibility with a wide-range of fuels. Delphi's brushless fuel pump, expected to enter in production in 2012, allows the power consumption to be reduced by approximately 36 percent. The reduced electrical demand will be particularly welcomed in diesel applications, where the higher power consumption of the pump places a high demand on the electrical system. Delphi can also supply the electronic control unit.
Delphi diesel fuel injection systems: two solutions to better fit customer requirements
Since its launch in 2008, Delphi's unique Direct Acting Diesel Common Rail System has proven its ability to help high performance four-cylinder engines offer the power of a larger six-cylinder engine with excellent refinement and substantially improved emissions and fuel economy.
“We are anticipating that this trend will continue, with three-cylinder engines appearing even in compact luxury cars,” said Bercher. “Delphi's Direct Acting Diesel Common Rail System, which was honored with several industry technology awards, will help deliver this new generation of extremely low emission vehicles.”
Additionally, Delphi's Direct Acting Diesel Common Rail System is designed for very demanding applications that require high fuel flow with exceptional control. And, Delphi's balanced-valve servo-solenoid technology offers the high performance of conventional servo-piezo systems yet with the simplicity and a cost effective proven solenoid technology that is a suitable solution for the majority of vehicles.
Delphi diesel common rail systems are available for light- and medium-duty applications, and a new ultra-high pressure heavy-duty diesel common rail system is in development for large commercial vehicle and off-highway applications. Delphi is also one of the world's largest suppliers of high performance electronic unit injectors for heavy duty diesel engines.
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