Delphi Automotive has developed a breakthrough in NOx control for
diesel engines with a new selective catalytic reduction (SCR) system
that improves the performance, packaging and long-term reliability of
the system as well as reduces vehicle CO2 emissions by up to 1g/km over
any comparable system, according to the company.
aqueous urea solution into a SCR system at up to four times the
pressure of any previous system, which allows the catalyst to be close
coupled to the engine, Delphi says it has solved many of the issues
associated with other SCR systems.
“As the EU regulations for CO2
emissions take effect, every additional gram of CO2 could potentially
cost the manufacturer up to 95 euros per vehicle in future
emissions-related penalties,” said Peter Spadafora, Delphi product team
leader, SCR Systems. “The Delphi SCR system reduces both NOx and CO2
emissions in order to add maximum value for our customers.”
system consists of three basic modules. The SCR doser (an injector with
integrated high-pressure pump) is mounted in the exhaust line just
ahead of the SCR catalyst and injects the urea solution at 20 bar
directly into the exhaust stream. The solution is supplied to the
injector by a low pressure pump within the Urea Delivery Module (UDM)
in the remote urea tank. The third element of the system is the
electronics and software used to control the dosing subsystem.