Method for preventing engine stall

Patent metadata

Field	Value
Publication number	US-9784193-B2
Application number	US-201615178236-A
Country	US
Kind code	B2
Filing date	Jun 9, 2016
Priority date	Dec 14, 2015
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

A method for preventing engine stall of a vehicle includes detecting, by a control portion, whether a purge control valve becomes short to ground or not, determining, by the control portion, how rich a fuel is that has flowed into the engine using an oxygen sensor when it is determined that the purge control valve becomes short to ground in the detecting step, and controlling, by the control portion, a target RPM of the engine to be increased when it is determined that the fuel is rich in the determining step.

First claim

What is claimed is:

1. A method for preventing engine stall of a vehicle comprising:
detecting, by a control portion, whether a purge control valve becomes short to ground or not;
determining, by the control portion, how rich a fuel is that has flowed into the engine using an oxygen sensor when it is determined that the purge control valve becomes short to ground in the detecting step; and
controlling, by the control portion, a target RPM of the engine to be increased when it is determined that the fuel is rich in the determining step.

2. The method for preventing engine stall of a vehicle of claim 1 , wherein the detecting step further comprises:
confirming whether the control portion transmits a driving signal to the purge control valve;
comparing, by the control portion, a measurement voltage at the purge control valve with a predetermined set-up voltage when it is determined that the control portion does not transmit the driving signal to the purge control valve in the confirming step; and
deciding, by the control portion, that the short to ground has occurred at the purge control valve when it is determined that the measurement voltage is less than the predetermined set-up voltage in the comparing step.

3. The method for preventing engine stall of a vehicle of claim 1 , wherein the control portion implements the detecting step only when an engine driving time is longer than a predetermined set-up time before the detecting step.

4. The method for preventing engine stall of a vehicle of claim 1 , further comprising a step of setting, by the control portion, a present engine RPM as the target RPM when it is determined in the determining step that the fuel that has flowed into the engine is normal.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Koo Bon Chang

Classifications

• F02D41/04

  Introducing corrections for particular operating conditions (F02D41/14 takes precedence) · CPC title

• F02M25/0809

  Judging failure of purge control system · CPC title

• F02D19/0623 Primary

  Failure diagnosis or prevention; Safety measures; Testing · CPC title

• F02D41/004

  Control of the valve or purge actuator, e.g. duty cycle, closed loop control of position · CPC title

• F02D41/0042

  Controlling the combustible mixture as a function of the canister purging, e.g. control of injected fuel to compensate for deviation of air fuel ratio when purging · CPC title