Method for limiting engine torque when error occurs in water sensor of fuel filter

Patent metadata

Field	Value
Publication number	US-9784203-B2
Application number	US-201514863435-A
Country	US
Kind code	B2
Filing date	Sep 23, 2015
Priority date	Nov 5, 2014
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

A method for limiting an engine torque when a failure occurs in a water sensor of a fuel filter includes sensing the failure of the water sensor installed in the fuel filter through a failure diagnosis logic in a diesel hybrid vehicle. A current vehicle driving mode is checked when the failure of the water sensor is sensed. Whether or not a first time period elapses a first delay time after sensing the failure of the water sensor when the current vehicle driving mode is an engine driving mode is determined. The engine torque is limited and reduced when the first time period elapses the first delay time.

First claim

What is claimed is:

1. A method for limiting an engine torque when a failure occurs in a water sensor of a fuel filter, the method comprising steps:
sensing, by an engine control unit (ECU), the failure of the water sensor installed in the fuel filter through a failure diagnosis logic in a diesel hybrid vehicle;
checking, by the ECU, a current vehicle driving mode when the failure of the water sensor is sensed;
determining, by the ECU, whether a first time period elapses a first delay time after sensing the failure of the water sensor when the current vehicle driving mode is an engine driving mode; and
limiting and reducing, by the ECU, the engine torque when the first time period elapses the first delay time.

2. The method of claim 1 , further comprising steps of:
storing, by the ECU, failure state information of the water sensor when the vehicle driving mode is a hybrid driving mode in an engine off state after sensing the failure of the water sensor;
measuring, by the ECU, a second time period when the vehicle driving mode is changed from the hybrid driving mode to the engine driving mode while storing the failure state information;
determining, by the ECU, whether the second time period after changing to the engine driving mode elapses a second delay time; and
limiting and reducing, by the ECU, the engine torque during driving when the second time period elapses the second delay time.

3. The method of claim 1 , wherein a cluster controller receive failure state information from the ECU to operate a warning device and the warning device alerts a driver the failure of the water sensor when the failure of the water sensor is sensed by the ECU.

4. The method of claim 3 , wherein the warning device is one or more of display devices that display a warning light in the cluster and warning labels.

5. The method of claim 4 , wherein the ECU senses the failure of the water sensor.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Jang Hwa Yong

Classifications

• F02M37/221

  Mechanical Engineering · mapped topic

• Y02T10/6286

  Cross-Sectional Technologies · mapped topic

• B60W10/08

  including control of electric propulsion units, e.g. motors or generators · CPC title

• B60W10/30

  including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps · CPC title

• F02N11/0814

  comprising means for controlling automatic idle-start-stop · CPC title