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Altitude Compensation for Target Engine Speed ​​in Hybrid Electric Vehicles

A hybrid electric and engine speed technology, which is applied in the arrangement of multiple different prime movers and engine control of hybrid vehicles and general power units, can solve problems such as unsatisfactory and achieve the effect of fast response time

Active Publication Date: 2018-07-17
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This approach may also be less satisfactory for some applications as it is highly processor intensive requiring the exact same calculations at many different engine speeds for each execution cycle

Method used

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  • Altitude Compensation for Target Engine Speed ​​in Hybrid Electric Vehicles
  • Altitude Compensation for Target Engine Speed ​​in Hybrid Electric Vehicles
  • Altitude Compensation for Target Engine Speed ​​in Hybrid Electric Vehicles

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Embodiment Construction

[0024] Embodiments of the present disclosure are described herein. It is to be understood, however, that the disclosed embodiments are merely examples and that other embodiments may take various and alternative forms. The figures are not necessarily to scale; some features may be exaggerated or minimized to show details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present invention.

[0025] As will be understood by those of ordinary skill in the art, various features shown and described with reference to any one figure may be combined with features shown in one or more other figures to produce features not explicitly shown or described example. The combinations of features shown provide representative embodiments for typical applications. However, various combinations and modifications of...

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Abstract

The present invention relates to altitude compensation for a target engine speed in a hybrid electric vehicle. A method for controlling a hybrid electric vehicle includes selecting a first target engine speed in response to a driver power request, calculating available engine torque at the first target engine speed, and if the available engine torque is insufficient to meet the driver power request, The target engine speed is then adjusted to command the engine to operate at the target engine speed. For fuel economy, the first target engine speed is optimized. The calculated available engine torque at the target engine speed is less than the calculated maximum engine torque, thereby maintaining a torque reserve for engine vacuum.

Description

technical field [0001] The present disclosure relates to hybrid electric vehicles and compensation for altitude conditions when setting a target engine speed. Background technique [0002] A hybrid electric vehicle may include a generator for controlling engine speed. In response to the power demand, engine speed and torque may be selected based on a calibratable map, which may be referred to as an energy management system (EMS) map. The EMS map is calibrated to achieve desired fuel economy and various other factors including performance, emissions, vehicle noise, vibration and harshness. EMS maps are usually collated based on sea level engine performance. [0003] Under some environmental conditions, such as increased altitude or increased ambient temperature, the available torque of the engine may decrease at some or all engine speeds. Under such conditions, the engine may not be able to deliver the torque specified by the EMS map at the target speed and, therefore, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D29/02
CPCB60K6/365B60K6/445B60W10/06B60W20/00B60W30/18B60W2710/0644B60W2555/40Y02T10/62F02D28/00
Inventor 卡罗尔·路易丝·大久保
Owner FORD GLOBAL TECH LLC