With the conception of internet of vehicle, the longitudinal control strategy of connected and automated truck platoon (CATP) to effectively deal with threat of cyberattacks has become an urgent challenge. Based on this, by flexibly changing the communication topology of truck platoon, this paper designs a communication topology safety response system (CTSRS), and further combined with the distributed model predictive control (DMPC) method, an improved longitudinal control strategy of CATP is tentatively proposed. The sufficient conditions for the asymptotic stability of truck platoon are derived by taking the cost function of CATP as the Lyapunov candidate function. Besides, the Next Generation Simulation (NGSIM) data is used to simulate the motion trajectory of the leading truck, which verifies the superior performance of DMPC in controlling the truck platoon to adjust the following behavior according to the different driving behavior of the leading truck. Finally, the cyberattacks scenario is set to conduct the comparative numerical simulation of platoon evolution. Numerical results show that DMPC can still ensure the stability and security of the truck platoon even if the trucks are suffered cyberattacks while CTSRS is enabled, which proves the feasibility of the improved longitudinal control strategy in resisting the threat of cyberattacks.

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