APPARATUS AND METHOD TO OPRATE AN ENGINE EXHAUST BRAKE TOGETHER WITH AN EXHAUST GAS RECIRCULATION SYSTEM

摘要

A compression release engine brake apparatus (70) and method for an internal combustion engine includes an exhaust gas recirculator (28, 42, 44) that is connectable between the exhaust outlet (30, 32) and the intake manifold (68) of the engine (22). The exhaust gas recirculator is operative during operation of the engine brake apparatus to recirculate at least a portion of exhaust gases from the exhaust outlet to the intake manifold to increase charging of the cylinders of the engine prior to the compression stroke. Preferably there is an exhaust restrictor (76) downstream of the exhaust outlet. The engine preferably includes a turbocharger (24) downstream of the exhaust outlet. The exhaust restrictor may be a restrictive turbocharger. Preferably there is an exhaust gas cooler (44) connectable between the exhaust outlet and the intake manifold. This process optimizes engine brake performance and is an effective control for exhaust pressure and temperature and for turbocharger speed.