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Methods and systems for hybrid vehicle power delivery

A hybrid vehicle and vehicle technology, applied in the field of power transmission and systems for hybrid vehicles, can solve problems such as increased noise and vibration discomfort, insufficient engine to satisfy the driver, and impact on vehicle performance

Active Publication Date: 2018-03-16
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The inventors have also recognized that even with increased intake air supply, the power output of an engine operating on the Atkinson cycle may not be sufficient to meet the driver's needs, thereby affecting vehicle performance and increasing noise vibration harshness (NVH) levels

Method used

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  • Methods and systems for hybrid vehicle power delivery
  • Methods and systems for hybrid vehicle power delivery
  • Methods and systems for hybrid vehicle power delivery

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Embodiment Construction

[0013] The following description relates to systems and methods for increasing the power output of a hybrid vehicle. An exemplary vehicle system with an engine and an electric motor is figure 1 shown in , and in figure 2 A detailed description of an engine system including a fuel system and an octane booster system is shown in . The engine controller can be configured to execute control routines such as image 3 An exemplary routine of ) to adjust engine operation to deliver a desired torque output while improving fuel efficiency. exist Figure 4 Exemplary engine operation to deliver a desired torque output is shown in .

[0014] figure 1 An exemplary vehicle propulsion system 100 is shown. For example, vehicle system 100 may be a hybrid electric vehicle or a plug-in hybrid electric vehicle. However, it should be understood that although figure 1 A hybrid vehicle system is shown, but in other examples, vehicle system 100 may not be a hybrid vehicle system and may be p...

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Abstract

ethods and systems are provided for adjusting engine operation of a hybrid vehicle to increase power output, and fuel efficiency. In one example, a method may include operating the engine using an Atkinson cycle during a lower than threshold engine torque demand, and a lower than threshold battery state of charge, and operating the engine using an Otto cycle during a higher than threshold torque demand. During operating in the Otto cycle, an octane booster may be injected to the fuel line to increase the octane level in the fuel.

Description

technical field [0001] The present description generally relates to methods and systems for increasing the power output of a hybrid vehicle. Background technique [0002] Engines in hybrid vehicles may operate on the Atkinson cycle, which provides higher fuel economy compared to operation on the Otto cycle. When operating in the Atkinson cycle, the intake valve may remain open for a longer duration than during the Otto cycle. Due to the longer intake valve opening time, the effective compression ratio of the Atkinson cycle is lower than the corresponding compression ratio achieved by the Otto cycle. For the Atkinson cycle, the effective expansion ratio is higher than the compression ratio, providing higher fuel efficiency. Therefore, the power delivered by operating the engine on the Atkinson cycle may be lower than the power delivered by operating the engine on the Otto cycle. Additionally, fuels with lower octane content can be used while operating the engine on the Atk...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D13/02F02D39/02F02M25/00B60W20/15B60W10/06B60W10/08B60L11/12B60L50/15
CPCB60W20/15B60L50/15B60W10/06B60W10/08F02D13/0234F02D13/0269F02D39/02F02M25/00B60W2540/10B60W2540/12B60W2710/083B60W2710/0677B60W2710/0666F02D41/0025F02D41/3076F02D2200/503F02P5/045F02P5/1502F02D41/3094B60W20/19B60W2520/10Y02T10/12Y02T10/40Y02T10/62B60W20/14B60K6/44F02D41/26F02D41/3058B60K6/00F02D19/0649
Inventor S·M·西尔M·E·雷博玲R·C·西卡克
Owner FORD GLOBAL TECH LLC
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