초록 ▼

In an internal combustion engine braking system which may provide compression release braking and/or exhaust braking, methods and systems are disclosed of controlling the overlap between an exhaust gas recirculation event and an intake valve event to optimize engine braking at various engine operati

In an internal combustion engine braking system which may provide compression release braking and/or exhaust braking, methods and systems are disclosed of controlling the overlap between an exhaust gas recirculation event and an intake valve event to optimize engine braking at various engine operating speeds. Optimization may be achieved by selectively advancing and retarding the opening and closing of an exhaust valve for exhaust gas recirculation. The opening and closing of the exhaust valve may be carried out responsive to the monitored levels of such engine parameters as: exhaust manifold pressure, exhaust manifold temperature, cylinder pressure, and/or cylinder temperature. Various engine parameters may be monitored. Control of exhaust gas recirculation may be responsive thereto, such that a monitored parameter does not exceed a predetermined level.

대표청구항 ▼

[ What is claimed is:] [1.] A method of controlling an exhaust gas parameter in an internal combustion engine having a piston which reciprocates to provide intake, compression, combustion, and exhaust strokes, said method using an exhaust gas recirculation event and an intake valve event, and compri

[ What is claimed is:] [1.] A method of controlling an exhaust gas parameter in an internal combustion engine having a piston which reciprocates to provide intake, compression, combustion, and exhaust strokes, said method using an exhaust gas recirculation event and an intake valve event, and comprising the steps of:generating exhaust gas back pressure in the engine;monitoring an exhaust gas parameter level; andcarrying out an exhaust gas recirculation event responsive to the level of the parameter,wherein the exhaust gas parameter is controlled by selectively varying an overlap period between the exhaust gas recirculation event and the intake valve event.