초록 ▼

In a turbocharger control system which includes fault testing circuitry which automatically senses and compares engine operating parameters of manifold pressure, exhaust temperature, engine speed, and actuator position, compares the sensed values to predetermined norms to establish the validity of t

In a turbocharger control system which includes fault testing circuitry which automatically senses and compares engine operating parameters of manifold pressure, exhaust temperature, engine speed, and actuator position, compares the sensed values to predetermined norms to establish the validity of the signals, in which substitutes preestablished values for the sensed signals when the sensed signal is determined to be invalid. The substituted value may be a value stored in the memory of a microprocessor used in the system or a value derived from a signal received from a different but corresponding sensor of the engine being controlled.

대표청구항 ▼

A fail-soft turbocharger control system for an engine with a first bank and second bank of cylinders and a first turbocharger and second turbocharger associated therewith, each turbocharger having a variable output compressor boosting the pressure of an input manifold to said associated bank of cyli

A fail-soft turbocharger control system for an engine with a first bank and second bank of cylinders and a first turbocharger and second turbocharger associated therewith, each turbocharger having a variable output compressor boosting the pressure of an input manifold to said associated bank of cylinders and a variable input turbine driving said compressor powered by the exhaust gases of said bank of cylinders for said control system comprising: a computing circuit including input circuit means for receiving sensor input signals representative of operational parameters of said engine, programmable memory means for storing predetermined tabular data and sequential and computational instructions, means responsive to said memory means for receiving said input signals and generating a plurality of said output signals as a function of said input signals, tabular data, and instructions, and output circuit means for outputting said plurality of output signals, sensor means connected to said engine and said computing circuit for sensing and generating said sensor input signals representative of the manifold pressure, exhaust gas temperature, engine speed, and the position of the throttle, compressor and turbine actuators of said engine, and actuator means connected to said output circuit means for controlling the position of said actuators in response to predetermined ones of said output signals, respectively, said computing circuit, sensor means, and actuator means defining a first turbine control loop for regulating the input of exhaust gases to the first turbine as a function of the error difference between the optimum manifold pressure of said first bank of cylinders and the actual manifold pressure of said first bank of cylinders; wherein said optimum manifold pressure is calculated from said stored tabular data and at least one operating parameter of the engine including the speed of the engine; a first compressor control loop for regulating the output of the airflow from the first compressor as a function of at least one operating parameter of the engine including the speed of the engine; a second turbine control loop for regulating the input of exhaust gases to the second turbine as a function of the error difference between the optimum manifold pressure of said second bank of cylinders and the actual manifold pressure of said second bank of cylinders; wherein said optimum manifold pressure is calculated from said stored tabular data and at least one operating parameter of the engine including the speed of the engine; a second compressor loop for regulating the output of the airflow from the second compressor as a function of said stored tabular data and at least one operating parameter of the engine including the speed of the engine; fault testing means for testing the validity of said sensor input signals, said fault testing means including means for determining whether the value of said speed signal is valid before regulating either the first and second turbine inputs or the first and second compressor outputs with that value.