A real-time control system usually requires maintaining a large amount of temporal data objects

which are logic descriptions for the fluctuant physical environment in the real world.These temporal data objects are accessed by application transactions to generate the ultimate control actions.In the actual applications

real-time control systems require not only ensuring transactions finished in the specified time limits

but also guaranteeing temporal consistency of data objects accessed by transactions.The traditional real-time concurrency control protocols stress on meeting transaction deadlines

while ignore the requirement to temporal consistency of data objects access by transactions.This paper first gives the formal definitions of temporal consistency about data and transaction.On the basis of them

a novel real-time concurrency control protocol called TCHP-2PL (Temporal Consistency High Priority two Phase Lock) is presented.TCHP-2PL can guarantee temporal consistency.In order to obtain the better real-time performance

an enhanced TCHP-2PL called STCHP-2PL is proposed by introducing the concept of similarity.Performance tests show that STCHP-2PL can still ensure the very well real-time performance under circumstances of ensuring temporal consistency.