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In 1997, they put 2 men and 2 women in a 30-foot chamber for 91 days (Schreckenghost et al. 1998b). A physical-chemical air revitalization system recycled the air for 3 of the 4 people, and a wheat crop in the 10-foot chamber did the same for the fourth. The ALS team also experimented with a solid-waste incinerator. Our second ALS AI control system managed the transfer of O2 and CO2 among the gas reservoirs for this test to ensure crew and crop health and to recycle gases produced by waste incineration. These reservoirs included a crew habitat, a plant chamber, an airlock, and a number of pressurized tanks (figure 1). Operating 24 hours a day, 7 days a week, the AI system also used a generative planner that scheduled waste incinerations and crop planting and harvesting, coordinating these tasks with the day-to-day product gas transfer. For both these projects, we used a three-layer architecture (Gat 1998) to design, organize, and develop the control software. AR&SD had used a particular implementation of this architecture known as 3T (see The 3T Intelligent Control System) in a number of robot projects prior to 1995 (Bonasso et al. 1997), and because life support systems are a form of immobots (Williams and Nayak 1996), its application to ALS projects was straightforward.

"While all three of the DE Series pumps offer full authority fuel timing and control, they utilize a ''building block'' approach of progressively adding features," said Paganini. "This approach provides engine manufacturers and system integrators the flexibility to define a fuel system that matches the engine''s functional needs. The objective is to meet the more demanding emissions and performance requirements, while minimizing pump complexity and price."We categorized the pump into three offerings starting with the basic model," Paganini continued. "From there, depending upon the system or engine requirements, you could adapt additional features, individually or in combination, using the building block approach. By starting at the basic pump model, you can demonstrate performance and emission compliance with minimal pump complexity and price. So rather than offering a single, full-featured pump, we''ve taken an approach that allows the OEM designer the flexibility to do his own interfacing, which opens up the possibility of utilizing their own componentry or outsourcing."