ENGINE PROTECTING APPARATUS FOR PREVENTING THE INFLOW OF MOISTURE

• US 20130144506A1
• Filed: 08/17/2010
• Published: 06/06/2013
• Est. Priority Date: 08/17/2010
• Status: Active Grant

• Current Assignee: Volvo Construction Equipment AB (Volvo AB)
• Original Assignee: Volvo Construction Equipment AB (Volvo AB)
• Inventors: Nam, Chan-Ung
• Granted Patent: US 9,228,529 B2
• Time in Patent Office: Days
• US Class Current: 701/102
• CPC Class Codes: F02D 2200/0611 Fuel type, fuel composition or fuel quality
• CPC Class Codes: F02D 31/009 for maximum speed control
• CPC Class Codes: F02D 41/0025 Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
• CPC Class Codes: F02D 41/04 Introducing corrections for particular operating conditions F02D41/14 takes precedence
• CPC Class Codes: F02D 41/22 Safety or indicating devices for abnormal conditions in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809
• CPC Class Codes: F02D 41/2403 using essentially up/down counters
• CPC Class Codes: F02D 45/00 Electrical control not provided for in groups F02D41/00 - F02D43/00
• CPC Class Codes: F02M 37/28 with means activated by the presence of water, e.g. alarms or means for automatic drainage
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

The present invention relates to an engine protecting apparatus for preventing the inflow of moisture, which drops the RPM (revolutions per minute) of an engine by generating an RPM drop request signal when moisture drain does not occur, wherein a time is counted from the point when a moisture detection signal is received from a WIF sensor installed in a moisture separator, and moisture drain is checked at the point when a counted cumulative time exceeds a set time. When moisture drain is not performed even after a signal for moisture drain is received from a moisture detecting sensor installed in the moisture separator, a driver is aware of the seriousness of moisture separation to thus separate moisture in the moisture separator as soon as possible. This prevents fatal damages which may be aroused in an injector or fuel system due to the introduction of moisture into an engine.

Claims

1. An engine protection apparatus for preventing inflow of water, comprising:

a time count unit configured to count time starting from the time point at which a water detection signal is received thereto from a WIF (Water In Fuel) sensor installed in a water separator;

an RPM (Revolution Per Minute) drop request unit configured to check whether or not water drain occurs at the time point when the counted accumulated time period exceeds a preset time period, generate an RPM drop request signal if the water drain does not occur, and default the RPM drop request signal if the water drain occurs; and

an engine RPM drop processing unit configured to drop the engine RPM in response to the generated RPM drop request signal.

2. The engine protection apparatus according to claim 1, wherein the dropping of the engine RPM is performed in such a manner that a reference drop RPM is matched to the current RPM to be dropped and is stored, and when the RPM drop request signal is applied to the engine RPM drop processing unit, the current RPM is dropped to the reference drop RPM that is matched to the current RPM.

3. The engine protection apparatus according to claim 1, wherein whether or not the water drain occurs is checked for at least two time points where the counted accumulated time period exceeds the preset time period, and if no water drain occurs, the RPM drop request unit generates the RPM drop request signal.