Method and system for engine braking in an internal combustion engine with exhaust pressure regulation and turbocharger control
AssigneeDiesel Engine Retarders, Inc.
InventorZhou Yang
Life of this patent
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Abstract
The present invention is directed to a system and method for controlling an engine braking system having an engine with at least one intake and exhaust valve, intake and exhaust manifolds, a turbocharger connected to the intake and exhaust manifolds, and at least one pressure regulation valve. The method may comprise the steps of measuring a value of an engine parameter; adjusting the pressure of the exhaust manifold responsive to the measured engine parameter value; actuating the at least one exhaust valve; and adjusting a pressure gradient across the turbocharger.
Claims22
A method of controlling the level of engine braking in an engine having at least one intake and exhaust valve, intake and exhaust manifolds, a turbocharger connected to the intake and exhaust manifolds, and an engine cylinder, said method comprising the steps of:
- actuating the at least one exhaust valve to produce a bleeder braking event;
- determining a first engine parameter level;
- and
- generating exhaust gas back pressure in the exhaust manifold responsive to the level of the first engine parameter;
- wherein the generated exhaust gas back pressure communicates with the engine cylinder during the bleeder braking event to control the level of engine braking.
A method of controlling the level of engine braking in an engine having at least one intake and exhaust valve, intake and exhaust manifolds, a variable geometry turbocharger (VGT) connected to the intake and exhaust manifolds, a pressure regulation valve coupled to at least one of the intake and exhaust manifolds, and an engine cylinder, said method comprising the steps of:
- actuating the at least one exhaust valve to produce a bleeder braking event;
- determining a first engine parameter level;
- closing the geometry of the VGT to a braking position to generate exhaust gas back pressure in the exhaust manifold responsive to the level of the first engine parameter, wherein the generated exhaust gas back pressure communicates with the engine cylinder during the bleeder braking event to control the level of engine braking;
- determining a second engine parameter level;
- and
- controlling the pressure regulation valve responsive to the level of the second engine parameter level.
Dependencies are inferred from the claim text.