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This paper describes the characterisation of heat transfer in a series of 11 test sections designed to represent a range of configurations seen in production exhaust systems, which is part of a larger activity aimed at the accurate modeling of heat transfer and subsequent catalyst light off in production exhaust systems comprised of similar geometries. These sections include variations in wall thickness, diameter, bend angle and radius. For each section a range of transient and steady state tests were performed on a dynamic test cell using a port injected gasoline engine. In each case a correlation between observed Reynolds number (Re) and Nusselt number (Nu) was developed. A model of the system was implemented in Matlab/Simulink in which each pipe element was split into 25 sub-elements by dividing the pipe into five both axially and radially. The modeling approach was validated using the experimental data.

The development of emission regulation proposals for off-highway engines presented a significant challenge to the design of the fuel injection systems. The DP200 range of pumps was evolved from the DPA to meet this need. It incorporates a number of enhancements that will enable emissions compliance. The paper will describe the operation of the new pump systems and show the results of their use on engines. Future evolution of the pump to meet the next round of emissions control and the use of electronics in off-highway markets will be discussed.