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System and method for boost control

A supercharging device and supercharging pressure technology, applied to combustion engines, machines/engines, internal combustion piston engines, etc., can solve the problems of wasting negative torque and difficult control

Pending Publication Date: 2019-07-30
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it may be difficult to precisely control the timing of operating the electric motor for motor driving and timing of power generation according to the boost pressure
Additionally, negative torque may be wasted if the battery coupled to the electric motor is unable to receive the charge generated (such as when the battery is already fully charged)

Method used

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  • System and method for boost control
  • System and method for boost control
  • System and method for boost control

Examples

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Embodiment Construction

[0017] The following description relates to systems and methods for improving boost pressure control and surge margin of a hybrid vehicle system having an engine with a boost configured with electric assist from an electric motor. figure 1 A non-limiting example of such a system is shown in which an electric turbocharger is provided in a hybrid electric vehicle. The engine controller can be configured to execute control programs such as figure 2 An exemplary procedure to address surge by coordinating actuation of the compressor recirculation valve with the wastegate valve and electric boost assistance provided by the electric motor. image 3 A prophetic example of coordinating electric assist motor and CCRV operation in response to surge is shown. Figure 4 Exemplary movement of compressor pressure ratio relative to the surge region of the compressor map in response to CCRV and electric motor actuation is shown. The engine controller can also be configured to execute contro...

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Abstract

The invention provides 'a system and a method for boot control'. Methods and systems are provided for improving surge control in a boosted engine system configured with an electric motor to provide electrical boost assistance. Tip-in and tip-out surge are addressed by increasing the opening of a compressor recirculation valve and coordinating the recirculation valve opening with adjustments to anexhaust waste-gate position and a power output by the electric motor. The adjustments enable an intake airflow to be provided that operates the compressor outside a surge region while providing a target boost pressure as operator torque demand increases or decreases.

Description

technical field [0001] The present description generally relates to methods and systems for coordinating control of an electrically assisted turbocharger and a continuously variable recirculation valve (CCRV). Background technique [0002] Engine systems may be configured with a boosting device, such as a turbocharger or supercharger, for providing a boosted charge and improving peak power output. The use of a compressor allows a smaller displacement engine to provide as much power as a larger displacement engine, with additional fuel economy benefits. However, turbochargers suffer from turbo lag. Because compressor speed depends on the speed at which the turbine can accelerate, there may be a lag between demanded boost pressure and delivered boost pressure during a momentary increase in torque demand. [0003] The transient response of a supercharged engine can be improved by adding electric assist to the turbocharger. One example of a supercharged engine system configur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B39/10F02B37/12F02B37/16F02B37/18F02B37/10
CPCF02B37/10F02B37/12F02B37/16F02B37/18F02B39/10F02B37/14F02B2037/125Y02T10/12
Inventor 朱莉娅·海伦·巴克兰肖柏韬泰勒·凯利大卫·贝尔
Owner FORD GLOBAL TECH LLC