Estimation of braking capability for two distinct auxiliary engine brake systems paired with an exhaust brake

Nowadays vehicles achieved an important increase in energy efficiency. Though highly desirable, in the case of heavy transport vehicles, this leads to a pronounced deficiency in their native deceleration capacity. This deficiency is more pronounced when traveling down slopes with important inclination, or when the traveling mode is with multiple starts and stops, as in the case of city travel. In such operating conditions, using only the conventional braking system can induce important thermal overloads, reducing braking efficiency, or even rendering the system useless. In order to limit this deficiency, auxiliary braking systems are often provided for heavy transport vehicles. Such systems serve to obtain a negative torque at the engine's crankshaft thus actively slowing the vehicle. The present paper aims to simulate the braking capacity obtained by using a combination of two distinct engine brake systems: the Jake brake and the Bleeder brake. The obtained results provide information regarding the evolution of thermodynamic parameters over the engine working cycle, with applications to optimize the deceleration capacity of vehicles that use diesel engines. Based on the presented data, it can be determined which of the analyzed auxiliary braking systems may be best suited, for implementation on particular road vehicles.