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Deceleration cylinder cut-off

A cylinder, air technology used in electrical controls, fuel air intakes, combustion engines, etc., to address issues such as hindering commercial adoption

Active Publication Date: 2017-11-28
TULA TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Although deceleration cylinder cutoff offers the potential for significant improvements in fuel economy and emissions characteristics, it involves several challenges hindering its commercial adoption

Method used

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Embodiment Construction

[0021] Some control strategies for supporting deceleration cylinder cut-off during operation of an internal combustion engine are described.

[0022] As noted in the background, there are several challenges associated with achieving deceleration cylinder cut-off. One such challenge is associated with intake manifold pressure. Specifically, when all cylinders are deactivated, no air exits the intake manifold. At the same time, leaks around the throttle valve and intake system will cause the manifold to fill towards atmospheric pressure. Therefore, when the cylinders re-engage, more torque than desired may be provided by each cylinder firing, which may result in undesirable NVH (noise, vibration and harshness) characteristics. One potential way to address NVH effects is to momentarily retard spark in a manner that reduces engine output enough to alleviate NVH issues. While this approach can work, it has the disadvantage of wasting fuel during the use of spark retarded cylinde...

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Abstract

Methods and arrangements for transitioning an engine between a deceleration cylinder cutoff (DCCO) state and an operational state are described. In one aspect, transitions from DCCO begin with reactivating cylinders to pump air to reduce the pressure in the intake manifold prior to firing any cylinders. In another aspect, transitions from DCCO, involve the use of an air pumping skip fire operational mode. After the manifold pressure has been reduced, the engine may transition to either a cylinder deactivation skip fire operational mode or other appropriate operational mode. In yet another aspect a method of transitioning into DCCO using a skip fire approach is described. In this aspect, the fraction of the working cycles that are fired is gradually reduced to a threshold firing fraction. All of the working chambers are then deactivated after reaching the threshold firing fraction.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Application No. 15 / 009,533, filed January 28, 2016, and Provisional Application No. 62 / 137,053, filed March 23, 2015. technical field [0003] The present application generally relates to control strategies for supporting deceleration cylinder cut-off during operation of an internal combustion engine. Background technique [0004] Fuel economy is a major consideration in engine design. One fuel saving technique commonly used in automotive engines is known as deceleration fuel cutoff (DFCO - sometimes called deceleration fuel cutoff DFSO). This mode of operation is typically used during engine / vehicle deceleration when there is no torque request (eg, when the accelerator pedal is not depressed). During DFCO, fuel is injected into the cylinders, providing a corresponding improvement in fuel economy. [0005] Although deceleration fuel cut improves fuel efficiency, it has several ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D17/02F02D17/00F02D29/00F02D41/00F02M35/10
CPCF02D41/0087F02D41/126F02D41/1454F02D41/22F02D17/02F02D41/0005F02D2041/0012F02D2200/0406F02D2200/602F02D13/06Y02T10/40Y02T10/12
Inventor 史蒂文·E·卡尔森袁欣S·哈希米维吉·斯里尼瓦桑斯里哈里·凯路里安德鲁·W·菲利普马克·A·威尔卡茨路易斯·J·塞拉诺师魁·凯文·陈
Owner TULA TECH INC
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