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Systems and methods for engine control

An engine and upstream technology, applied in the direction of engine control, electric engine control automatic control, automatic control, etc.

Active Publication Date: 2018-11-13
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the measured exhaust air-fuel ratio may run leaner than expected

Method used

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  • Systems and methods for engine control
  • Systems and methods for engine control
  • Systems and methods for engine control

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Embodiment Construction

[0017] The following description relates to systems and methods for diagnosing degradation of an EGR system due to a disconnected upstream hose of an EGR differential pressure sensor. figure 1 An example engine system including an EGR system is shown in . EGR can be provided for example according to image 3 An example method of achieving desired engine dilution. as in Figure 4 As shown in the method, the amount of EGR entering the engine can be used to generate a fuel command. If the hose upstream of the EGR differential pressure sensor becomes disconnected, it can appear as if more EGR is entering the engine than it actually is, which can be determined by the engine controller based on figure 2 method for non-invasive detection. The hose upstream of the EGR differential pressure sensor can then, for example, be passed according to Figure 5 The method runs dedicated monitoring to diagnose. Figure 6 An example timeline for identifying EGR system degradation due to a ...

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Abstract

Systems and methods for engine control are provided. Methods and systems are provided for adjusting spark timing and fueling in an engine in response to an indication of exhaust gas recirculation (EGR) system degradation due to a disconnected upstream hose of an EGR differential pressure sensor. In one example, a method may include, responsive to an integrated knock intensity being greater than athreshold intensity and a fuel control correction being greater than a threshold enrichment, setting an EGR rate to zero and triggering an EGR differential pressure sensor upstream hose diagnostic routine to be performed. Further, spark timing and fueling may be set for zero EGR.

Description

technical field [0001] The present invention generally relates to methods and systems for controlling an engine in response to degradation of exhaust gas recirculation control. Background technique [0002] Engines may include external exhaust gas recirculation (EGR) systems to reduce NOx emissions and increase engine efficiency. An external EGR system may couple the engine exhaust manifold to the engine intake manifold via an EGR passage. Additionally, the EGR system may include temperature sensors and / or pressure sensors to estimate the amount of EGR flowing to the engine cylinders. During the course of operation, EGR actuators, sensors, pipes or hoses may become disconnected. EGR system components may become dislodged due to engine boost pressure, vibrations caused by irregular road surfaces, or other conditions. Deterioration of the EGR system may degrade engine performance, for example, by increasing emissions or reducing fuel economy. [0003] As one example, EGR f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/00F02D43/00
CPCF02D35/027F02D37/02F02D41/005F02D41/0077F02D41/3094F02D41/40F02D2041/389F02D2200/02F02D41/0072F02M26/49F02P5/045F02P5/1504F02P5/1516F02M35/1038F02P5/152Y02T10/40F02D41/0052F02D41/1454F02D43/04
Inventor C·P·格鲁格拉
Owner FORD GLOBAL TECH LLC