Design and Examination of Electrified Exhaust Brake System Using Direct Current Motor

Abstract

Vehicle systems for safety and driver convenience are being installed worldwide. In particular, in the case of a large vehicle accident, various safety devices are applied to avoid risks to human life and property. Among these systems, the most basic are electric braking systems, lane departure warning systems, lane-keeping assistance systems, and drowsiness prevention devices. In particular, a device to improve the braking performance of large vehicles to prevent accidents is important. Auxiliary brakes are used to prevent the frequent use of the main brake and share the braking force in large vehicles. If the main brake is used excessively, braking power loss, such as vapor lock, may occur. Therefore, it is essential to install an auxiliary brake for large vehicles. There are several auxiliary brakes; however, structurally simple exhaust brakes are the most commonly used. Pneumatic actuators are used to operate the existing exhaust brakes and additional parts are used to create pressure; therefore, it is necessary to develop electric exhaust brakes. Electric exhaust brakes can reduce weight and cost by removing modules and additional parts. In this study, the electrified exhaust brake system was improved compared with the existing pneumatic actuator. A DC motor is applied to obtain this benefit, which is easy to control and inexpensive was designed. A high-ratio reducer was applied in consideration of the characteristics of the exhaust brake that requires high torque. To verify the performance, the module unit test, module test, and field test were performed.