Traditional engine calibration has focused on steady-state engine operation, which accounts for the largest proportion of many emissions cycles. Steady-state emissions measurements may be made with conventional analyzers (with typical response times of 1 s). During engine speed/load transients, cylinder conditions change rapidly, with large differences between each firing cycle. As steady-state calibrations improve, the significance of emissions during transients increases, and reducing these transient emissions can hold the key toward meeting cycle targets. To pinpoint the cylinder conditions that cause these high emissions requires an analyzer with a much faster response time.
Cambustion’s analyzers for HC, NOx, CO/CO2 and particulates offer unrivaled response times and are used by engineers and researchers around the world to improve their understanding of engine operation and to meet emissions targets in a time- and cost-effective manner. Cambustion’s engineers have a detailed understanding of engine processes through their work and regularly publish SAE papers and application notes on novel techniques.
Cambustion gas analyzers allow engineers to measure features such as cycle-by-cycle exhaust gas recirculation (EGR) rate, EGR mal-distribution between cylinders and consequent NOx production, gasoline direct injection (GDI) fuel preparation, and many other issues that present relevant challenges. Since Cambustion gas analyzers use standard measurement techniques, direct correlation between homologation and development measurements can be achieved.
Cambustion’s particulate analyzers may be configured to provide both mass and particle number, allowing simultaneous development for existing and proposed legislation. With many companies turning to GDI engines for fuel economy, Cambustion’s particulate analyzers are being used to optimize these engines and their aftertreatment to meet particulate emissions legislation. Cambustion’s particulate analyzer range includes the capability to sample directly from the exhaust (for example, when a CVS tunnel is not available) and to sample onboard in a moving vehicle.
As emissions limits around the world are progressively reduced, Cambustion products provide key tools to reduce drive-cycle emissions during transient operation and to investigate variability during steady-state operation.
Since 2007, Cambustion has manufactured a diesel particulate filter (DPF) testing system, the DPG. The DPG is a stand-alone DPF testing system that can load DPFs with diesel soot and regenerate them in a controllable manner. The DPG has been embraced by DPF and vehicle manufacturers around the world. Computer control of air and fuel flows in the DPG eliminates the variability problems encountered when using engines to load DPFs and allows for unmanned operation, making the DPG a cost-effective and technically superior solution for DPF testing and development. (See also SAE tech paper 2010-01-0809.)
Cambustion has remained the world’s leading developer and manufacturer of fast-response engine emissions analyzers for more than 20 years. With headquarters in the U.K. and agents and distributors offering local technical support around the world, Cambustion products and techniques are used by vehicle and aftertreatment manufacturers to develop the next generation of engines and comply with ever tightening emissions standards.