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Control system for a vehicle powertrain and method of operating a vehicle powertrain

A technology of vehicle power and control system, which is applied to the control system of vehicle powertrain and the field of running vehicle powertrain, and can solve the problems of increasing exhaust FA emissions and the like

Active Publication Date: 2022-07-15
FCA US
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If not accounted for, this difference in exhaust FA could lead to increased emissions

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  • Control system for a vehicle powertrain and method of operating a vehicle powertrain
  • Control system for a vehicle powertrain and method of operating a vehicle powertrain
  • Control system for a vehicle powertrain and method of operating a vehicle powertrain

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Embodiment Construction

[0019] As mentioned above, there is still a need to improve engine systems when scavenging, especially for turbocharged engine systems. In naturally aspirated (NA) engines, the scavenging ratio—the ratio of the air charge flowing through the cylinder to the mass of gas trapped in the cylinder—is typically relatively low (eg, ~1.01 or 1% of air charge). On the other hand, in turbocharged engine systems, the achievable scavenging ratio is typically much larger (eg, up to ~1.25 or 25% of the air charge flowing through the cylinder). Larger scavenging ratios of turbocharged engine systems can result in reduced engine performance if accurate consideration is not given to controlling the supply of air and fuel to the engine.

[0020] Accordingly, a turbocharged engine control system and method for regulating emissions during scavenging is presented. These techniques can be grouped into three interrelated features: (i) closed-loop in-cylinder air / fuel ratio (FA) control (enrichment...

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Abstract

A control system for a vehicle powertrain and method of operating the vehicle powertrain utilizing exhaust gas O 2 A sensor and a controller configured to operate a turbocharged engine in a scavenging mode, and while operating the engine in a scavenging mode: command a target in-cylinder air / fuel ratio (FA) to achieve a target exhaust air / fuel ratio, based on Scavenge ratio and target in-cylinder air / fuel ratio adjust exhaust oxygen O 2 sensor measurements to obtain the corrected O 2 concentration, adjust the exhaust system temperature modeled by the thermal model to obtain a corrected exhaust system temperature, and based on the corrected O 2 The concentration and corrected exhaust system temperature adjust the target in-cylinder air / fuel ratio.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This patent application claims the benefit of US Application Serial No. 15 / 805,314, filed November 7, 2017. The disclosures of the aforementioned applications are incorporated herein by reference in their entirety. technical field [0003] The present invention relates generally to internal combustion engines, and more particularly, to a control system for a vehicle powertrain and a method of operating the vehicle powertrain. Background technique [0004] Internal combustion engines combust a mixture of air and fuel within cylinders to generate drive torque at the crankshaft. Scavenging refers to an engine operating mode in which a specific overlap of cylinder intake and exhaust valve opening is commanded so that fresh air forces residual exhaust gas out of the cylinder. Utilizing the scavenging mode of the engine may improve engine performance under certain operating conditions, such as low engine speeds. However, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D43/04F02D41/14F02D13/02F02D41/00
CPCF02D41/1487F02D41/0007F02D41/1454F02D13/0261F02B25/00F02D2200/0804F02D41/1447Y02T10/12F02D13/0203F02D35/0015F01N11/005F02D2200/101F02D2200/04F01N3/101
Inventor 威廉·P·阿塔尔徐硕楠T·图托恩M·A·巴基
Owner FCA US