Automobile suspension have the function of improving passenger comfort by isolating vehicle from external disturbances and increase holding ability of the vehicle by providing adequate suspension deflections. This work presents an improved model of an active control strategy presented in an earlier work. The work presented an active control system for an air suspension based on mass flow control. In the earlier model of a single degree of freedom (SDOF), system had been considered. The present work gives a more refined version of earlier model of quarter active suspension. Two degree of freedom quarter car model is considered. Three different control strategies of an active control are modeled and simulated. It is seen that an active control system with the mass flow rate of air as a function of relative velocity of sprung mass to unsprung mass has transmissibility less than 1 for low value of damping and gain equal to 1 in the system. Similar response is seen if the active control system has low damping and gain equal to -1 with mass flow rate of air to airspring as a function of sprung mass velocity. These two strategies are proposed be used in the active air suspension system.