System and method for reducing vane sticking in a variable geometry turbocharger
一种涡轮增压器、叶片的技术，应用在减小可变几何涡轮增压器中叶片粘滞的系统领域，能够解决发动机损坏、不期望背压等问题
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Embodiment approach 200
[0032] At 202 , the method includes determining whether a tip-in is being implemented. It should be appreciated that tip-out may include interrupting throttle adjustment and / or reducing fuel injection in the engine. It should be appreciated that a tip-out request may be sent to the engine system (eg, control system) when the driver has interrupted the torque request via an input device such as an accelerator pedal and / or closed loop vehicle speed control.
[0033] If tip-out has not been implemented ("NO" at 202), the method ends. However, in other cases the method may return to 202 if tip-out has not been implemented. If tip-out is implemented (“YES” at 202 ), the method proceeds to 204 . At 204 , the method includes applying engine braking via the VGT in response to tip-out. Implementing engine braking via the VGT in response to tip-out may include moving a plurality of vanes in the VGT toward a closed position in response to tip-out at 205 . Further, in some examples, i...
Embodiment approach 300
[0037] At 302 , the method includes implementing a tip-out. Implementing tip-out may include moving a throttle plate in the throttle from an open position to a fully closed position. It should be understood that the throttle may have multiple opening angles and thus multiple open positions. In the case of a compression ignition engine, implementing tip-out may additionally or alternatively include shutting off fuel delivery to the cylinder.
[0038] Next at 304 , the method includes moving a plurality of vanes in the variable geometry turbocharger toward a closed position in response to tip-out. In one example, the vanes are in a turbine of a variable geometry turbocharger. In one example, the closed position of the plurality of vanes is a configuration of the vanes in a turbine in which airflow through the turbine is substantially prevented. Further in one example, the step of moving a plurality of vanes in the variable geometry turbocharger is performed when a request for...
Embodiment approach 400
[0043] At 402 , the method includes receiving a tip-out request. The tip-out request is generated and sent to the control system in response to a driver interrupting torque request via an input device such as an accelerator pedal and / or vehicle closed loop speed control. It should be appreciated that the tip-out request may be generated in response to driver input from the accelerator pedal and / or closed loop speed control of the vehicle. Specifically, the driver may interrupt the torque request via the accelerator pedal to initiate a tip-in, or the vehicle closed loop speed control may request no torque.
[0044] At 404 , the method includes initiating tip-in in response to receiving a tip-out request. Initiating tip-out may include moving a throttle plate in the throttle from an open position toward a fully closed position at 406 . Alternatively, in the case of compression ignition, tip-out may include shutting off cylinder fuel delivery.
[0045] Next at 408 the method i...
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