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Method and system for engine control

A technology of engine and engine speed, applied in the direction of engine control, engine-driven traction, engine components, etc., can solve the problems of fuel economy degradation, engine load moving back and forth, frequent fuel switching, etc., to reduce knock limit, reduce Effect of fuel switching and improvement of fuel economy

Inactive Publication Date: 2017-12-08
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another problem is that frequent changes in the operator's pedal demand can cause the engine load to shift back and forth, causing frequent switching between fuels
Excessive switching between fuels can degrade fuel economy due to losses incurred during switching

Method used

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  • Method and system for engine control
  • Method and system for engine control
  • Method and system for engine control

Examples

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Embodiment Construction

[0016] The following description relates to the improvement of figure 1 Systems and methods for fuel economy in a powertrain of a vehicle. The powertrain may include an engine configured to operate on one or more of a variety of fuels available on the vehicle, as referenced figure 2 The engine system described. The controller can be configured to execute control programs such as image 3 An example routine to select a fuel for combustion in the engine while adjusting the engine speed-load curve at the selected fuel by adjusting the speed ratio of the CVT to better utilize the fuel economy benefits of a multi-fuel engine. The controller can compare fuel island data maps for each fuel, such as Figure 5 An example map of . refer to Figure 4 and Figure 6 An example map is shown that may be used by the controller to select whether to maintain fuel or switch between fuels. Figure 7 Example engine operation with fuel usage and CVT adjustments is shown at . In this way, m...

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PUM

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Abstract

Methods and systems are provided for integrating a bi-fuel engine with a CVT transmission. Responsive to a driver demand, a controller may determine whether to maintain usage of a current fuel or transition to an alternate fuel based on the cost efficiency of the transition and further based on any engine limitations that may be incurred at the engine speed-load following the transition. To improve the net fuel economy benefit while addressing the engine limitation, a fuel transition may be combined with a CVT adjusted engine speed-load regime, while maintaining engine power output.

Description

technical field [0001] The present description generally relates to methods and systems for controlling fuel usage of an engine coupled to a continuously variable transmission (CVT). Background technique [0002] The engine may operate on a variety of different fuels, which may be delivered separately, or in different ratios, depending on operating conditions. Different fuels can result in different engine efficiencies under given operating conditions. For example, an engine may use a first fuel (eg, ethanol) and a second fuel (eg, gasoline), each with different knock suppression capabilities, to reduce engine knock limitations while improving overall fuel economy. Thus, there may be a variety of reasons why different fuels available to an engine may have different efficiencies under various engine operating conditions. As an example, available fuels may have different octane ratings, which affects spark retard use and engine efficiency at high loads (for example, when the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D19/06F02D29/02B60L50/11
CPCF02D19/061F02D19/0649F02D29/02F02D35/027F02D41/0025F02D2200/10F02D2200/101F02D2200/60F02D2200/0611F02D2200/0625F02D2400/12F02M69/046B60W10/06B60W10/101B60W30/1882B60W30/20B60W2030/206B60W2710/0677B60W2710/10F02D19/0602F02D19/0615F02D41/3094F02M43/04B60W2530/213Y02T10/84Y02T10/30B60W2900/00F02D41/2406F02D41/26
Inventor K·J·米勒T·G·里昂D·R·马丁
Owner FORD GLOBAL TECH LLC
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