Turbocharger controls
AssigneeCummins Inc.
InventorBryce A. Heckaman
Life of this patent
Estimating the term…
Abstract
A process includes operating an electronic control system to control operation of an engine system. The operating includes operating the engine at an engine speed and an EGR fraction and the turbocharger within a steady state speed limit, in response to the engine speed and the EGR fraction, setting an actuator limit on position of the turbine actuator, and in response to a change in one or both of the speed of the engine and the EGR fraction, proactively adjusting the turbine actuator according to the actuator limit prior to an increase in turbocharger speed, the adjusting limiting turbocharger speed overshoot relative to a speed limit.
Claims20
A process comprising:
- operating an electronic control system to control operation of an engine system including an engine, a turbocharger including a turbine configured to receive exhaust from the engine and a compressor configured to supply intake air to an intake of the engine, a turbine actuator configured to adjust exhaust flow through the turbine, an EGR valve configured to variably recirculate exhaust to the intake of the engine, and an electronic control system in operative communication with the engine, the turbine actuator, and the EGR valve, wherein the operating comprises
- operating the engine at an engine speed and an EGR fraction,
- operating the turbocharger within a steady state speed limit,
- in response to the engine speed and the EGR fraction, setting an actuator limit on a position of the turbine actuator;
- and
- in response to a change in one or both of the speed of the engine and the EGR fraction, proactively adjusting the turbine actuator according to the actuator limit prior to an increase in turbocharger speed, thereby limiting turbocharger speed overshoot relative to a speed limit.
A system comprising:
- an engine;
- a turbocharger including a turbine configured to receive exhaust from the engine and a compressor configured to supply intake air to an intake of the engine;
- a turbine actuator configured to adjust exhaust flow through the turbine;
- an EGR valve configured to variably recirculate exhaust to the intake of the engine;
- and
- an electronic control system in operative communication with the engine, the turbine actuator, and the EGR valve, the electronic control system being configured to
- operate the engine at an engine speed and an EGR fraction,
- operating the turbocharger within a steady state speed limit,
- in response to the engine speed and the EGR fraction, set an actuator limit on a position of the turbine actuator;
- and
- in response to a change in one or both of the speed of the engine and the EGR fraction, proactively adjust the turbine actuator according to the actuator limit prior to an increase in turbocharger speed effective to limit turbocharger speed overshoot relative to a speed limit.
An apparatus for controlling operation of an engine system including an engine, a turbocharger including a turbine configured to receive exhaust from the engine and a compressor configured to supply intake air to an intake of the engine, a turbine actuator configured to adjust exhaust flow through the turbine, an EGR valve configured to variably recirculate exhaust to the intake of the engine, the apparatus comprising:
- one or more non-transitory memory media configured with instructions executable by one or more processors to perform acts of:
- operating the engine at an engine speed and an EGR fraction,
- operating the turbocharger within a steady state speed limit,
- in response to the engine speed and the EGR fraction, setting an actuator limit on a position of the turbine actuator, and
- in response to a change in one or both of the speed of the engine and the EGR fraction, proactively adjusting the turbine actuator according to the actuator limit prior to an increase in turbocharger speed, thereby limiting turbocharger speed overshoot relative to a speed limit.
Dependencies are inferred from the claim text.