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Thermal Control Mirrors and mirror substrates have been exposed to various simulated space radiation environments. One of the key parameters for this type of spacecraft component is the solar absorptance. Results are presented which compare the change in solar absorptance of four mirror types after exposure to electron, proton and UV irradiation. Comparisons between radiation induced degradation of substrates and the thermal control mirrors are made, an explanation for the smaller than expected degradation is provided.

A manifold filling model is used to derive a real time cylinder air charge estimate for mass air flow rate sensor equipped vehicles. The derivation shows that a simple first order linear difference equation in the discrete cylinder event domain is obtained from a coupled set of nonlinear differential equations.

As part of a general EGR system model, an adiabatic thermodynamic vacuum EGR valve actuator model was developed and validated. The long term goal of the work is improved system operation by correctly specifying and allocating EGR system component requirements.