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Method and system for engine fuel and torque control

An engine and fuel injection technology, applied in the field of oxygen sensors, can solve the problems of reducing the performance potential of the controller of the oxygen sensor data, loss of accuracy, expensive calculation, etc., to achieve the effect of improving engine performance, accurate engine fuel supply and torque control

Active Publication Date: 2021-11-19
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such processing adds latency that reduces the performance potential of controllers using oxygen sensor data
Furthermore, this processing is computationally expensive and may not be feasible with current ECU architectures
Further, signal processing may lose accuracy during transient operation (such as when engine speed increases) and / or engine speed requires even more computational resources

Method used

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  • Method and system for engine fuel and torque control
  • Method and system for engine fuel and torque control
  • Method and system for engine fuel and torque control

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Embodiment Construction

[0015] The following description refers to the use of figure 1 A system and method for accurately estimating intake air charge in an engine with an oxygen sensor in an intake passage of an engine system. figure 2 An example embodiment of an intake air oxygen sensor is shown in . The uncorrected output of the oxygen sensor estimated in the presence of diluent flow (such as the presence of EGR flow, purge fuel vapor flow, or crankcase fuel vapor flow) can be used to determine the net oxygen content of the intake air charge and for fuel and torque control( Figure 3 to Figure 4 ). The controller may be configured to sample the oxygen sensor output at uniform time increments (eg, 1 millisecond time increments) and angularly stamp the samples. These crank angle flagged oxygen sensor signal samples may be buffered, and a subset of the buffered samples may be accessed during engine operation to determine air charges into cylinders and subsequently adjust operating parameters of t...

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Abstract

The present application relates to methods and systems for engine fuel and torque control. Methods and systems are provided for accurately estimating intake air charge based on output of an intake oxygen sensor while flowing EGR, purge, or PCV hydrocarbons to an engine. The unadjusted air charge estimate is used for engine fuel control, and the hydrocarbon adjusted air charge estimate is used for engine torque control. The controller is configured to sample the oxygen sensor in uniform increments in the time domain, label the sampled data in the crank angle domain, store the sampled data in a buffer, and then select from the buffer the One or more data samples of are used to estimate the intake air charge.

Description

technical field [0001] The present description generally relates to an oxygen sensor coupled to an intake passage of an internal combustion engine. Background technique [0002] The engine may be equipped with an oxygen sensor coupled to the intake passage for determining the oxygen content of fresh intake air. In particular, the sensor measures the partial pressure of oxygen in the air charge after equalization. The air charge can be further corrected for the presence of diluents, which can react with oxygen at the sensor, thereby affecting the output of the sensor. For example, the oxygen sensor output is corrected for humidity, presence of hydrocarbons from EGR, purge fuel vapors, crankcase ventilation fuel vapors, etc. An example of such an approach is shown in US Patent Application 20140251285 by Surnilla et al. [0003] The corrected air charge estimate may then be used to control engine fueling. However, the inventors herein have recognized that oxygen sensors hav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/14F02D41/18F02D41/38F02D41/26
CPCF02D41/0042F02D41/144F02D41/1454F02D41/182F02D41/26F02D41/38F02D41/3094F02D2041/389F02D2200/04F02D2200/0614F02D2250/08F02D41/0065F02D41/2454F02D2200/0402F02D2250/14F02D2250/18F02D2041/286F02M35/10373F02M35/10393F02D35/028F02D41/0077F02D41/263
Inventor R·D·珀西富尔J·切恰克J·N·尤瑞G·苏尼拉
Owner FORD GLOBAL TECH LLC