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US 10,208,657 B2Granted
Diagnostic method for a compressor recirculation valve
AssigneeFord Global Technologies, LLC
InventorsAdam Nathan Banker, Baitao Xiao, Hamid-Reza Ossareh
Life of this patent
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Abstract
Methods are provided for identifying degradation in components of a compressor recirculation valve (CRV). One method includes differentiating between degradation of a throttle of the CRV and a position sensor of the CRV based on each of a throttle inlet pressure and commanded position of the throttle of the CRV. The method also includes utilizing output from the position sensor of the CRV in response to the commanded position of the throttle of the CRV.
Claims4
A system, comprising:
- an engine;
- a turbocharger for providing a boosted aircharge to the engine, the turbocharger including an exhaust turbine and an intake compressor;
- an intake throttle positioned in an intake passage downstream of the intake compressor;
- a wastegate coupled across the exhaust turbine;
- a continuously variable recirculation valve (CCRV) coupled across the intake compressor, the CCRV including a CCRV throttle and a CCRV position sensor;
- a throttle inlet pressure sensor coupled to the intake passage upstream of the intake throttle and downstream of the intake compressor;
- and
- a control system with computer-readable instructions stored on non-transitory memory for:
- actuating a change in position of the CCRV;
- determining degradation of the CCRV based on feedback from the CCRV position sensor indicating the CCRV throttle did not change position in response to the actuating;
- and
- during a first condition, indicating degradation of the CCRV position sensor;
- and
- during a second condition, indicating degradation of the CCRV throttle.
11 more elements
Dependencies are inferred from the claim text.