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System and method for engine oil temperature estimation

A technology of engine and engine speed, applied in the direction of engine lubrication, engine components, combustion engine, etc., can solve the problems of engine component deterioration, suboptimal engine performance, engine life reduction, etc., to reduce the need and improve the accuracy of torque estimation degree of effect

Pending Publication Date: 2019-04-05
FORD GLOBAL TECH LLC
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  • Abstract
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Problems solved by technology

However, if the warm-up time or the last estimated EOT value is corrupted due to a KAM error, the initial EOT estimate may be inaccurate, at least for the first few minutes of vehicle operation
As such, inaccuracies in EOT estimation can lead to suboptimal engine performance
Additionally, excessive heating of the engine oil can lead to deterioration of engine components and reduced engine life

Method used

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  • System and method for engine oil temperature estimation
  • System and method for engine oil temperature estimation
  • System and method for engine oil temperature estimation

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Embodiment Construction

[0016] The following description relates to systems and methods for controlling a vehicle engine having a variable cam timing (VCT) device actuated using oil pressure via an oil control valve, such as Figure 1-2 shown. The engine controller can be configured to execute control routines such as Figure 4 ) to estimate engine oil temperature (EOT) under conditions where the default EOT estimation method is unreliable, such as due to sensor degradation or due to unreliable sensor output. The controller can apply a pulse width signal to know the zero duty cycle of the oil control valve ( Figure 5 ) and then based on the mapping relationship between VCT duty cycle and EOT ( Image 6 ) to infer EOT. refer to Figure 7-10 The example of shows an exemplary EOT estimation.

[0017] figure 1 An exemplary embodiment of a combustion chamber or cylinder of internal combustion engine 10 is depicted. figure 1 It is shown that engine 10 may receive control parameters from a control s...

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Abstract

Methods and systems are provided for estimating engine oil temperature during conditions when sensors used for engine oil temperature measurement are not functional or not reliable. A null duty cycleof a solenoid spool valve of a variable cam timing mechanism is estimated. Then, a calibrated relationship between the duty cycle, an angular velocity of the associated cam, and the engine oil temperature is used to estimate an engine oil temperature when existing sensors used in the calculation of engine oil temperature calculation become unreliable.

Description

technical field [0001] The present description generally relates to methods and systems for estimating engine oil temperature in engine systems configured with oil pressure actuated VCT mechanisms. Background technique [0002] Engine control systems use a number of variables for adjusting various engine operations. For example, engine oil temperature (EOT) estimates may be used to calculate total friction and pumping losses at the engine, which in turn are used for torque control. As another example, EOT is used for powertrain limiting where engine idle speed and maximum and minimum allowable engine speeds are limited to protect the engine from extreme temperature conditions such as may occur when EOT is too high or too low. The EOT value can also be used to adjust variable camshaft timing, control positive crankcase ventilation, and engine oil life monitoring. [0003] Various methods have been developed for EOT estimation. Some methods rely on direct EOT estimation via...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01M9/10F01M11/10F01L1/344
CPCF01L1/3442F01L2001/34426F01M9/10F01M11/10F01L1/34409F01L2001/0535F01L2001/3443F01L2001/34456F01L2250/02F01L2250/04F01L2800/05F01L2800/11F01L2820/01F01M2011/0045F01M2011/1473F02D13/0219F02D2041/001F02D2200/023Y02T10/12F02D13/0207G01K7/427
Inventor E·D·苏美尔王沿
Owner FORD GLOBAL TECH LLC
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