Cummins Ip, Inc.

Cummins Engine Company, Inc.

William A Rankin

Vivek Anand Sujan

Morgan MacKenzie Andreae

Adrian P Dale

Jeffrey A Matthews

Randal L Bergstedt

Danny R Baker

David L Clark

Dmitri V Baraban

Kenneth S Houston

An apparatus, system, and method are disclosed for predictive control of a turbocharger. The method includes interpreting a compressor performance model for a turbocharger, and interpreting at least one current operating parameter. The method further includes calculating a performance margin, calculating a performance margin derivative, and calculating a response value. The performance margin comprises a choke margin or a surge margin according to the position of an operating point in the compressor performance model. The performance margin is implemented in a first sigmoid function, and the performance margin derivative is implemented in a second sigmoid function. The response value is determined by applying a MIN function to the output of the product of the sigmoid functions in the choke margin case, and by applying a MAX function to the product of the sigmoid functions in the surge margin case.

Apparatus, system, and method for predictive control of a turbocharger

An apparatus, system, and method are disclosed for preventing turbocharger overspeed in a combustion engine. The method includes determining a turbocharger error term as a difference between a nominal turbocharger maximum speed and a current turbocharger speed. The method further includes determining a turbocharger speed derivative with respect to time. The method includes calculating a turbocharger control response based on the turbocharger error term and the turbocharger speed derivative with respect to time. The turbocharger control response may be a modified turbocharger maximum speed calculated by determining a reference speed multiplier based on the turbocharger error term and the turbocharger speed derivative with respect to time, and multiplying the reference speed multiplier by the nominal turbocharger maximum speed. The method thereby smoothly anticipates turbocharger transient events, and prevents an overspeed condition of the turbocharger.

Apparatus, system, and method for preventing turbocharger overspeed in a combustion engine

A diagnostic system for an engine is provided for which a plurality of annunciators are energized according to particular fault code sequences. A self-diagnosis mode is controlled by use of the vehicle throttle. The self-diagnosis mode can be initiated by a predetermined number of cycles of the vehicle throttle, in which a cycle corresponds to depressing and releasing the throttle beyond upper and lower limits. In one aspect of the invention, a timer is used to determine whether the predetermined number of throttle cycles occurs within a fixed time limit. If not, then the self-diagnosis mode is not activated. Once the self-diagnosis mode is activated, subsequent cycles of the vehicle throttle will increment the annunciators among the sequential fault codes.

System and method for controlling diagnostic annunciators

Growing community of inventors

Columbus, IN, United States of America

William A Rankin