Technologies for Greener Gasoline, Diesel and Hybrid Vehicles From Delphi

Delphi Automotive engineers are outlining innovative solutions to the emissions challenges facing both gasoline and diesel vehicles in technical papers presented at the 21st Aachen Colloquium held Oct. 8 to 10 in.

The Aachen Colloquium “Automobile and Engine Technology” has become the largest automotive and engine technology congress in Europe, and there Delphi, a major automotive supplier, has shown technical papers describing its near production-ready Selective Catalytic Reduction (SCR) dosing system. This system provides what the company describes as a uniquely cost-effective approach to urea injection.

Delphi’s papers will also describe a Gasoline Direct Injection Compression Ignition (GDCI) engine that is currently in advanced development.

The papers are complemented by extensive hardware displays at the Delphi booth that include a range of new, light-weight power electronics products for hybrid and electric vehicles.

The first paper is titled “Delphi SCR Dosing System: An alternative approach for close-coupled SCR catalyst systems.”

It explains how a new high-pressure water cooled urea doser simplifies the dosing system architecture compared to conventional approaches and how it is suitable for use on close-coupled SCR exhaust systems #151; where the SCR catalyst is placed closer to the engine for faster light-off.

“The doser generates an outstanding spray quality enabling high levels of NOx conversion, even at low exhaust temperatures,” explained David Needham, Delphi’s chief engineer on the SCR system. “The innovative arrangement provides a simple and robust solution for NOx reduction to meet Euro 6 Step 2 emissions regulations, and to minimize CO2 emissions without the cost and package increases normally associated with additional aftertreatment.”

The Delphi SCR system, which is suitable for passenger cars and light commercial vehicle applications, is complemented by a new ammonia sensor. SCR catalyst systems produce ammonia in order to reduce NOx emissions.


According to Delphi, measuring ammonia with this sensor provides excellent feedback for precise urea dosing control, and offers a signal for on-board diagnostics (OBD) and monitoring of the SCR system. The first production application of Delphi’s SCR dosing system is scheduled for 2015.

Gasoline direct injection compression ignition (GDCI)

Delphi’s second paper, titled “Combustion System for Gasoline Direct Injection Compression Ignition (GDCI)” describes Delphi’s work on a completely new approach to combustion that delivers a combination of low fuel consumption and low exhaust emissions.

“GDCI uses precise gasoline injection to enable well-timed and controlled compression ignition for high efficiency with low combustion noise,” said Harry Husted, chief engineer, Advanced Powertrain.

New two-stage diesel injector jointly demonstrated by Daimler and Delphi

A third paper, presented by Daimler AG, details the joint Daimler-Delphi development of a combustion system using a new prototype two-stage diesel injector from Delphi.

According to the paper, the injector uses a new variable orifice nozzle (VON) concept to minimize the conflict between reduced emissions, increased power output and lower combustion noise. The additional control of fuel flow, made possible by the VON, permits greater optimization of diesel combustion and has already shown improved part-load fuel economy with lower noise and smoke levels.

Delphi is also showcasing what it dubs as a range of innovative power electronics products, including Delphi’s high-performance inverter, DC/DC converter, on-board battery charger, battery management system and hybrid vehicle control unit.

Delphi says its high-performance inverter uses patented power silicon packaging to reduce cost, size and weight while increasing overall reliability. The unique packaging eliminates wire bonds, enables higher current and power density, and when combined with dual-side cooling, reduces power semiconductor area. The inverter is expected to start production in 2013.

Delphi also stated its battery pack controller calculates state-of-charge, evaluates battery health and determines power available for the vehicle. Using these calculations, it performs cell balancing to maintain cell safety and increase battery life. Delphi’s battery pack controller is scalable, AUTOSAR capable, low cost, compatible with multiple cell chemistries and is currently in production.

Inverters, battery packs and other HEV/EV components create a high-voltage environment that can be dangerous to drivers and service technicians.

Delphi says its electrical and electronic architecture systems help keep both safe with physical harness protection systems, battery monitoring devices, plug-in charging systems and a series of connection systems that incorporate the shielding, sealing and high-voltage safety interconnects required for high-voltage/high-power applications.