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Methods and systems for surge control

An actuator and engine technology, applied in combustion engines, machines/engines, internal combustion piston engines, etc., can solve the problem of reducing engine performance, can not solve hard surge and soft surge equally, can not solve soft surge well vibration etc.

Inactive Publication Date: 2015-02-25
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Also, Blaiklock's valves may not address hard and soft surge equally
For example, the opening of the compressor bypass valve and the resulting rapid increase in compressor airflow can better resolve hard surge that occurs during transient conditions such as tip-out, but not well during steady-state conditions soft surge
Specifically, if the valve is commanded open, the large suction pressure reduction associated with valve opening can reduce engine performance during soft surge conditions

Method used

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  • Methods and systems for surge control
  • Methods and systems for surge control
  • Methods and systems for surge control

Examples

Experimental program
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Effect test

Embodiment 200

[0032]Embodiment 200 shows CRV 158 in a default half-open state. Valve 158 may be coupled to boost intake chamber 146 so that, in a semi-open state, a portion of cooled compressed air received downstream from the charge air cooler can be recirculated into passage 159 for delivery to the compressor inlet.

[0033] The valve 158 may include a valve stem 206 , a valve head 204 and a valve body 202 . Valve head 204 may be displaced (eg, raised or lowered) into valve opening 205 via valve stem 206 to vary the amount of gas flow 208 through the valve. A pair of stepped ridges including an upper ridge 214 and a lower ridge 216 may be coupled to the valve stem 206 . A removable retaining washer 218 may also be coupled to the valve stem 206 . In the default position, the removable retaining washer 218 may be retained directly below the upper spine 214 . The non-removable retaining washer 220 may be arranged in line with the upper spine 214 in the default position. By raising or lo...

Embodiment 700

[0048] Embodiment 700 includes the same spring with inner precompression and outer precompression spring figure 2 pre-compressed spring system. However, compared to figure 2 Alignment of the example, so that Figure 7 The alignment of the washers relative to the stepped ridges is reversed in the embodiment. exist Figure 7In the preferred embodiment, the movable retaining washer 718 is held directly above the lower ridge 216, while the non-removable retaining washer 720 is held in line with the lower ridge 216 in the default position. Here, when the actuator 222 is energized to apply a downward force to or push the valve stem 206 , the downward force causes the upper ridge 214 to be pushed downward toward the movable retaining washer 718 . Due to the displacement of the upper ridge 214 towards the movable retaining washer 718, the loading and compression of the pre-compressed inner spring 712 is increased. Specifically, the compression of the inner spring 712 between th...

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Abstract

Methods and systems are provided for improving a margin to surge. A compressor recirculation valve is held at a semi-open position during steady-state boosted engine operation and operation in a soft surge region. The valve is fully opened to reduce hard surge, or fully closed to meet a transient increase in boost demand.

Description

technical field [0001] The present application relates to methods and systems for improving surge control utilizing compressor recirculation airflow. Background technique [0002] Engine systems may be configured with a boosting device, such as a turbocharger or supercharger, to provide a boosted air charge and improve peak power output. The use of a compressor allows a smaller displacement engine to provide as much power as a larger displacement engine, but with additional fuel economy benefits. However, compressors are prone to surge. For example, when the operator lifts off the accelerator pedal, the engine intake throttle closes, resulting in reduced forward airflow through the compressor, possibly causing compressor surge. Surge can cause NVH issues such as undesired noise from the engine intake system. Therefore, depending on the state of airflow and suction pressure, the compressor may be in a soft surge or hard surge region of operation. During hard surge, the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B37/12F02B39/16
CPCF02B47/08F02B2037/125F02B33/00F02B37/16Y02T10/12
Inventor G·P·麦康威尔J·H·巴克兰
Owner FORD GLOBAL TECH LLC
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