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Method and system for diagnosing boost pressure control

A technology of boost pressure and boost control, applied in electrical control, engine control, fuel injection control, etc., can solve problems such as deterioration

Pending Publication Date: 2018-12-18
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, due to errors in modeling expected output, there may be cases where significant differences between expected and actual sensor output are incorrectly attributed to degraded boost response, or insignificant differences compared to undegraded Case where boost response is incorrectly correlated

Method used

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  • Method and system for diagnosing boost pressure control
  • Method and system for diagnosing boost pressure control
  • Method and system for diagnosing boost pressure control

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Embodiment Construction

[0016] The following description refers to methods for diagnosing boosted engine systems such as figure 1 A system and method for a boost control system in an engine system). The engine controller can be configured to execute control routines such as Figure 2A-2B example routine) to diagnose boost control capability based on feedback response time to boost pressure deviations. Once qualified conditions (such as image 3 Those detailed) allow monitoring of response times to better account for response time deviations due to pressure overshoot, undershoot, or engine idle conditions. Figure 4 Example changes in desired, projected, and actual boost pressures in a non-failed boosted engine system are shown in . refer to Figure 5 and Image 6 A predictive example of boost pressure diagnostics is shown. In this way, boosted engine performance is monitored and system failures of boost response control can be diagnosed.

[0017] figure 1 An example of a combustion chamber or...

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Abstract

The invention discloses a method and system for diagnosing boost pressure control. Methods and systems are provided for providing passive boost pressure monitoring for slow response with higher confidence. A response time of a boost pressure feedback control loop following a boost pressure deviation that is triggered by either system disturbances or operator torque demand is monitored. Slow boostbehavior is correlated with boost control degradation affecting drivability and emissions.

Description

technical field [0001] The present invention generally relates to methods and systems for diagnosing slow boost pressure control in a boosted engine system. Background technique [0002] The engine system may be configured with a boosting device, such as a turbocharger, to provide a charge of charge air and improve peak power output. A turbocharger consists of a turbine in the engine's exhaust path that uses some of the available exhaust energy to drive an attached compressor, located upstream of the engine, forcing more fluid through the intake manifold . As the turbine spins, exhaust pressure rises, reducing outlet flow from the combustion process until the compressor boosts intake manifold pressure sufficiently to overcome backpressure. The use of a compressor allows a smaller displacement engine to provide as much power as a larger displacement engine, but with additional fuel economy benefits. [0003] Boost pressure may be controlled during engine operation such tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/22
CPCF02D41/221F02B37/18F02B37/24F02D41/0007F02D2041/1432F02D2200/0406F02D2200/0408Y02T10/12Y02T10/40
Inventor S·W·麦格纳M·J·范纽斯塔特J·E·M·赫尔斯特伦I·K·尤A·阿普库特坦J·R·史密斯
Owner FORD GLOBAL TECH LLC