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This paper describes Virtual-Hardware-In-the-Loop Simulation (VHILS), a new validation method for real-time control systems. HILS integrates multiple-technology domain simulators and uses no actual hardware components. Target software in binary code formats are executed with CoMET™, a virtual processor platform and physical layer signals are emulated with MATLAB®/Simulink®. Thus, VHILS can replace HILS, which is widely used for control software validation today. The VHILS was applied to the development of adaptive cruise control system (ACCS), and driver maneuvering, vehicle dynamics, microcontroller operation and CAN communication were modeled. The data exchange between multi-domain simulation and communication modeling were identified to be the primary causes of longer computational time.