Systems and methods for identifying environmental conditions

A technology for environmental conditions, ambient humidity, applied in charging systems, exhaust gas recirculation, electrical control, etc., to solve the problem of not accurately tracking condensate levels, insufficiently reducing condensate formation and engine stalls, and inability to accurately track condensate levels. Estimating problems such as condensate formation

Inactive Publication Date: 2018-07-13
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Specifically, the aforementioned control systems that respond to ambient air temperature and humidity will reduce condensate in some cases; however, these variables may not accurately track condensate levels in the CAC
Also, not all vehicles are equipped with humidity sensors
Therefore, other variables may be used to tune the control system as described above, which may not accurately estimate the condensate formation of the CAC
Therefore, condensate formation and engine stalling may not be adequately reduced

Method used

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  • Systems and methods for identifying environmental conditions
  • Systems and methods for identifying environmental conditions
  • Systems and methods for identifying environmental conditions

Examples

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Embodiment Construction

[0022] The following description refers to the use of figure 1 A system and method for estimating ambient humidity from the efficiency of a charge air cooler (CAC) in the system shown). Ambient humidity values ​​can be used in condensate models such as figure 2 shown to determine condensate formation in the CAC. The condensate formation information may then be used to adjust engine actuators and initiate engine control programs to reduce condensate formation and engine stalling. By means of determining a more accurate humidity value, such as image 3 With the method shown, the condensate model can be improved. Windshield wiper speed can be used to confirm high humidity values ​​and infer the presence of rain. Figure 4 Exemplary engine actuator adjustments are presented in response to condensate formation based on humidity values ​​inferred from CAC efficiency and wiper speed.

[0023] figure 1 An exemplary embodiment of an engine system 100 in a schematically illustrat...

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Abstract

The present invention relates to systems and methods for identifying environmental conditions. Methods and systems are provided for estimating an ambient humidity value for determining condensate formation in a charge air cooler. Determines the ambient humidity value based on charge air cooler efficiency and windshield wiper speed threshold. The humidity value is used to calculate the amount of condensate in the charge air cooler and to control engine systems to reduce condensate formation and engine stalling.

Description

Background technique [0001] Turbocharged engines may use a charge air cooler (CAC) to cool the compressed air coming from the turbocharger before it enters the engine. Depending on the cooling and humidity of the intake air, especially in humid or rainy weather conditions, condensate can form in the CAC when the intake air cools below the water dew point. When the intake includes recirculated exhaust, the condensate can become acidic and corrode the CAC casing. In the case of water-cooled air coolers, corrosion can lead to leaks between the air charge, the atmosphere and possibly the coolant. Condensate can collect within the CAC and then be immediately drawn into the engine during periods of increased air mass flow, increasing the chances of the engine stalling. [0002] Other attempts to address condensate formation include restricting the passage of intake air through the CAC or restricting the flow of ambient air cooled to the CAC. An exemplary method is shown in U.S. 6...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02B29/04
CPCF02B29/0425F02B29/0437F02B29/0468F02D29/02F02D41/0002F02D41/021F02D2200/0418F02M25/0227F02M35/088F02M26/06F02M26/23Y02T10/12B60W10/06B60W10/10
Inventor C·P·格鲁格拉K·载S·S·山田
Owner FORD GLOBAL TECH LLC
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