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Systems and methods for a variable displacement engine

A technology of engine and exhaust flow, which is applied in the direction of engine starting, engine testing, engine components, etc., and can solve problems such as cost increase and limitation

Pending Publication Date: 2019-02-01
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As another example, such methods are incapable of differentiating between cylinders in which some of the cylinder valves are functionally degraded from cylinders in which all of the cylinder valves are functionally degraded
In yet another example, additional sensors may be required to monitor certain engine parameters in order to diagnose degradation of the VDE mechanism, resulting in increased cost
Still further, this approach would require the engine to be operated in VDE mode which would be limited during severe city driving or during engine operation under heavy load
Opportunities to diagnose VDE degradation are limited since the VDE mechanism is not regularly actuated

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  • Systems and methods for a variable displacement engine
  • Systems and methods for a variable displacement engine
  • Systems and methods for a variable displacement engine

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Embodiment Construction

[0016] The following description relates to systems and methods for diagnosing a variable displacement mechanism in a variable displacement engine (VDE). as reference Figure 1 to Figure 2 The example engine system shown illustrates that selective cylinder deactivation in VDE allows engine displacement to vary. The engine controller can be configured to execute control programs such as Figure 3 to Figure 4 Example routine of ) to identify degradation of deactivable cylinder valves including VDE mechanisms during non-fueling conditions such as engine shutdown and DFSO. Figure 5 to Figure 6 An example of diagnostics of the VDE mechanism performed during a no-fuel engine condition is shown in .

[0017] figure 1 An example engine 10 is shown having a first row 15a and a second row 15b. In the depicted example, engine 10 is a V8 engine with four cylinders each in the first and second banks. Engine 10 has an intake manifold 16 , a throttle valve 20 and an exhaust manifold 18...

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Abstract

Methods and systems are provided for diagnostics of a cylinder valve actuation mechanism in a variable displacement engine (VDE). In one example, during an engine-off condition, the engine may be rotated unfueled, via a starter motor, and a reference exhaust air flow may be estimated. One or more deactivatable engine cylinders may then be deactivated and degradation of the cylinder valve actuationmechanism may be indicated based on a difference between the exhaust air flow following the cylinder deactivation and the reference exhaust air flow.

Description

technical field [0001] The present invention generally relates to methods and systems for diagnosing cylinder valve actuation in variable displacement engines (VDEs). Background technique [0002] Some engines, known as variable displacement engines (VDEs), may be configured to operate with a variable number of cylinders activated and deactivated to improve fuel economy. Among other things, a portion of the engine's cylinders may be disabled during selected conditions defined by parameters such as speed / load windows and various other operating conditions including engine temperature. An engine control system may disable a selected bank of cylinders, such as a bank, by controlling multiple cylinder valve actuators that affect the operation of each cylinder's intake and exhaust valves. By deactivating engine cylinders at low speed / light loads, associated pumping losses may be minimized and engine efficiency may be increased. [0003] In some cases, the mechanism that actuate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D13/06F02D41/04
CPCF02D13/06F02D41/04F02D41/042F02D41/1445F02D41/1448F02N11/04F02D2041/0012F02D2250/24G01M15/106F02D41/0087F02D41/221Y02T10/40F02D41/18F02D2200/0406G01M15/042
Inventor A·M·杜达尔
Owner FORD GLOBAL TECH LLC
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