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Systems and methods for lp-egr transmission in variable displacement engines

A technology of engine and engine load, applied in the direction of combustion engine, engine control, machine/engine, etc., can solve the problems of increasing combustion instability and misfire

Active Publication Date: 2021-01-22
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the engine may be exposed to higher EGR levels than the engine can withstand in non-VDE mode, resulting in increased combustion instability and misfire

Method used

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  • Systems and methods for lp-egr transmission in variable displacement engines
  • Systems and methods for lp-egr transmission in variable displacement engines
  • Systems and methods for lp-egr transmission in variable displacement engines

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Embodiment Construction

[0017] The present description relates to an EGR system coupled to a turbocharged variable displacement engine in a motor vehicle. In one non-limiting example, a VDE engine can be configured to operate at figure 1 A portion of the engine system shown in , where the engine includes at least one cylinder, a control system, a turbocharger, an exhaust gas recirculation system, and other components. The engine is also constructed with the figure 2 Multiple cylinder banks shown in . The engine controller can be configured to execute control programs such as Figure 3 to Figure 4 Exemplary routine of ) to adjust LP based on the minimum cylinder load requirement of the engine when the engine transitions between operation with all cylinders activated (non-VDE mode) and operation with one or more cylinders deactivated (VDE mode) -EGR schedule. Different EGR schedules can be selected based on engine speed load maps such as Figure 5A and Figure 5B speed load graph. refer to F...

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PUM

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Abstract

Methods and systems are provided for controlling LP-EGR flow in variable displacement engines. In one example, the method includes providing a higher fixed LP-EGR percentage relative to total intake air flow during VDE mode and providing a lower fixed EGR percentage relative to total intake air flow during non-VDE mode. Further, during tip-out when operating in VDE mode at loads below a threshold, transitioning away from VDE mode follows transitioning of LP-EGR from a higher fixed percentage to a lower fixed percentage.

Description

technical field [0001] The description generally relates to methods and systems for improving LP-EGR delivery in variable displacement engines. Background technique [0002] Exhaust gas recirculation (EGR) systems recirculate a portion of exhaust gas from the engine exhaust port to the engine intake system to increase fuel economy and improve vehicle emissions by reducing throttling losses and combustion temperatures. In turbocharged engines, the EGR system may include a low-pressure EGR (LP-EGR) circuit that diverts exhaust gas from downstream of the turbine of the turbocharger and injects the gas prior to the compressor. However, the LP-EGR loop has a long delivery delay because the exhaust gases must run through the turbocharger compressor, high pressure air induction duct, charge air cooler, and intake manifold before reaching the combustion chamber. Therefore, it can be difficult to provide a desired amount of EGR to the cylinders, especially during transient condition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D21/08
CPCF02D21/08F02D41/107F02D41/005F02D15/00F02D17/02F02D41/0087F02D41/0065Y02T10/40
Inventor 戈皮昌德拉·苏尼拉詹姆斯·艾尔佛雷德·希尔迪奇克里斯·保罗·格卢格拉林恩·艾梅·切斯尼丹尼尔·约瑟夫·斯泰尔斯
Owner FORD GLOBAL TECH LLC