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Variable displacement engine including different cam lobe profiles

A cam lobe, engine technology, applied in the direction of engine components, engine control, camshaft drive, etc., can solve the problem of reducing engine efficiency, does not solve the difference of deactivable poppet valve lift and/or lift timing, and increases engine control issues of complexity

Pending Publication Date: 2019-04-02
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As an example, reducing the length variation between valve deactivation roller hydraulic valve lifters reduces the amount of lift and / or lift timing variation of lifter driven poppet valves, but it does not address the relative Problems with discrepancies in lift and / or lift timing of non-deactivable poppet valves
As another example, advancing the timing of cams associated with deactivatable valves relative to cams associated with non-deactivatable valves may increase engine control complexity and reduce engine efficiency

Method used

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  • Variable displacement engine including different cam lobe profiles
  • Variable displacement engine including different cam lobe profiles
  • Variable displacement engine including different cam lobe profiles

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Embodiment Construction

[0016] The following description relates to systems and methods for engines including cams having different cam profiles. engine (such as figure 1 The engine shown) includes a plurality of cylinders, each cylinder having at least one intake valve and at least one exhaust valve. Such as figure 2 As shown, the engine may be a second engine of an engine family, where the first engine of the engine family includes only non-deactivatable cylinders, and where the second engine includes both non-deactivable cylinders and deactivatable cylinders. Such as image 3 As shown, the intake and exhaust valves are driven by a plurality of cams via rotation of the engine's camshaft. Each camshaft of the second engine includes a first set of cams having a first cam lobe profile and a second set of cams having a second cam lobe profile. Valves actuated by the first set of cams are switchable from an active mode to an inactive mode (and vice versa), and valves actuated by the second set of c...

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Abstract

The invention relates to a variable displacement engine including different cam lobe profiles. Methods and systems are provided for an engine including cams having different lobe profiles. In one example, cams of a first cam group drive a plurality of deactivatable cylinder valves and cams of a second cam group drive a plurality of non-deactivatable cylinder valves. The cams of the first cam groupinclude a different lobe profile relative to cams of the second cam group.

Description

technical field [0001] The present description generally relates to methods and systems for internal combustion engines including cams having different lobe profiles. Background technique [0002] Internal combustion engines may be configured to operate with a variable number of activated or deactivated cylinders to increase fuel economy, while optionally maintaining a total exhaust gas mixture air-fuel ratio approximately stoichiometric. This operation may be referred to as VDE (Variable Displacement Engine) operation. In some examples, a portion of the engine's cylinders may be disabled during selected conditions, which may be defined by parameters such as engine speed and / or load thresholds, as well as various other operating conditions such as vehicle speed. The control system may enable and / or disable selected cylinders by adjusting a plurality of cylinder valve deactivators that affect operation of the cylinder's intake and exhaust valves. [0003] Each cylinder valv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L1/08F02D13/02F02D13/06
CPCF01L1/08F02D13/0207F02D13/0261F02D13/06F01L1/14F01L1/18F01L1/24F01L13/0005F01L2001/0537F01L2001/186F01L2013/001F01L2250/02F01L2250/04F01L2800/08F01L2305/00F01L1/047F01L1/20F02B73/00
Inventor D·纳克尔K·切纳斯R·S·弗比
Owner FORD GLOBAL TECH LLC
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