Vacuum-actuated wastegate
AssigneeFord Global Technologies, LLC
InventorsJohn Eric Rollinger, David Bell, Joseph Norman Ulrey, Ross Dykstra Pursifull
Life of this patent
Estimating the term…
Abstract
Embodiments for vacuum generation are provided. In one example, a method comprises when boost is below a threshold, generating vacuum with an actuator in a first position by flowing air from a compressor outlet to an intake manifold through a first ejector, and when boost is above the threshold, generating vacuum with the actuator in a second position by flowing air from the compressor outlet to a compressor inlet through a second ejector. In this way, vacuum may be generated by more than one ejector via actuation of a common actuator.
Claims18
A method, comprising:
- providing an output of a sensor to a controller;
- when boost pressure based on the output is below a threshold, generating vacuum via a first ejector by operating an actuator in a first position and flowing air from a compressor outlet to an intake manifold through the first ejector via the controller, the actuator coupled to the controller, wherein generating vacuum via the first ejector by operating the actuator in the first position further comprises opening a first valve and closing a second valve with the actuator via the controller in order to flow air through the first ejector;
- and
- when boost pressure based on the output is above the threshold, generating vacuum via a second ejector by operating the actuator in a second position and flowing air from the compressor outlet to a compressor inlet through the second ejector via the controller.
A method, comprising:
- providing an output of a sensor to a controller;
- during a first condition of boost pressure greater than a threshold boost pressure based on the output, generating vacuum via a first ejector by opening a first valve and closing a second valve with a common actuator that is coupled to the controller and flowing air from a compressor outlet to an intake manifold through the first ejector via the controller;
- and
- during a second condition of boost pressure less than the threshold boost pressure based on the output, generating vacuum via a second ejector by closing the first valve and opening the second valve with the common actuator and flowing air from the compressor outlet to a compressor inlet through the second ejector via the controller.
A system for an engine, comprising:
- a controller including non-transitory instructions executable to control a common actuator;
- a first ejector positioned across a throttle in an air intake of the engine, a flow through the first ejector controlled by a first valve;
- a second ejector positioned in a compressor bypass flow from the compressor outlet to the compressor inlet, a second flow through the second ejector controlled by a second valve;
- and
- the common actuator configured to simultaneously adjust a position of the first valve and the second valve in response to at least one of boost pressure above a threshold, a compressor operation in a surge condition and turbocharger lag.
Dependencies are inferred from the claim text.