Enviro Systems designs and manufactures environmental control systems for the global Aerospace industry. Enviro’s environmental control system automatically regulates cabin temperature, mass inflow, and cabin pressurization.
The environmental control system is brokendown into four major sub-systems:
- Bleed Air Mass Inflow Control
- Bleed Air Temperature Control
- Vapor Cycle Cooling
- Cabin Pressurization
These systems are fully automatic to minimize pilot workload. To control cabin temperature, the crew simply selects desired cabin temperature. The system controller will determine and set the required mass inflow rate, the bleed air temperature, operation of the vapor cycle compressor, and the evaporator fan speed. For cabin pressurization, no pilot input is required as the necessary information is taken directly from the flight management computer.
Enviro’s electronic controllers communicate with aircraft avionics via digital bus or discrete inputs. Maintenance and status data can also be provided to the aircraft avionics.
The central system controller is responsible for operating all of the system components to achieve the desired environment. Utilizing a proprietary cascaded PID algorithm, Enviro’s controllers control the various system components via CAN Bus and discrete inputs to maintain cabin temperature. Software embedded in the system controller is certified to the RTCA DO-178 level D standards.
The cabin pressurization controller controls the operation of the two outflow valves. Software embedded in the system controller is certified to the RTCA DO-178 level B standards.
By integrating the control of these components into a single system, Enviro provides a comfortable and safe environment throughout the entire flight envelope.