Engine device

• US 9,032,718 B2
• Filed: 07/01/2010
• Issued: 05/19/2015
• Est. Priority Date: 07/02/2009
• Status: Active Grant

• Current Assignee: Yanmar Power Technology Co., Ltd.
• Original Assignee: Yanmar Company Limited (Yanmar Holdings Co., Ltd.)
• Inventors: Noma, Yasuo
• Primary Examiner(s): Denion, Thomas
• Assistant Examiner(s): STANEK, KELSEY L
• Application Number:
  US13/261,092
• Publication Number:
  US 20120124979A1
• Time in Patent Office: 1,783 Days
• Field of Search: 603/11, 602/97, 602/95, 602/87
• US Class Current: 60/311
• CPC Class Codes: B66F 9/07595 Cooling arrangements for device or operator
• CPC Class Codes: E02F 9/2066 of the type combustion engines
• CPC Class Codes: E02F 9/2095 Control of electric, electro-mechanical or mechanical equipment not otherwise provided for, e.g. ventilators, electro-driven fans control of hydraulic driven equipment E02F9/22
• CPC Class Codes: F01N 13/0097 the purifying devices are arranged in a single housing
• CPC Class Codes: F01N 13/1855 the connection being realised by using bolts, screws, rivets or the like
• CPC Class Codes: F01N 2470/02 Tubes being perforated
• CPC Class Codes: F01N 2470/18 the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus
• CPC Class Codes: F01N 2470/24 Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled
• CPC Class Codes: F01N 2590/08 for heavy duty applications, e.g. trucks, buses, tractors, locomotives
• CPC Class Codes: F01N 3/0211 Arrangements for mounting filtering elements in housing, e.g. with means for compensating thermal expansion or vibration
• CPC Class Codes: F02D 29/02 peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
• CPC Class Codes: F02D 41/0205 using an auxiliary engine speed control engine speed control per se F02D31/00
• CPC Class Codes: F02D 41/0245 by increasing temperature of the exhaust gas leaving the engine
• CPC Class Codes: F02D 41/029 the exhaust gas treating apparatus being a particulate filter
• CPC Class Codes: F02D 41/08 for idling F02D41/06, F02D41/16 take precedence
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

In an engine device provided with an engine which serves as a power source, an exhaust gas purifying filter device which is arranged in an exhaust gas path of the engine, and control means which executes a low rotation control for lowering an engine speed to a predetermined first low rotating speed at a time when a previously set low rotation condition is established, the control means is structured such as to maintain the engine speed at a second low rotating speed which is higher than the first low rotating speed, for suppressing a reduction of an exhaust gas temperature at a time when both of the low rotation condition and a previously set forced regeneration condition are established.

Claims

1. An engine device comprising:

an engine which serves as a power source and has a rotating speed, the rotating speed including an operating rotating speed during a work operation;

an exhaust gas purifying filter device which is arranged in a path of an exhaust gas of the engine; and

a control means for coordinating lowering and raising of engine speed to achieve forced regeneration of said filter device during presence of a plurality of low rotation conditions, said control means being configured

to execute a low rotation control for lowering speed of the engine toward a predetermined first low rotating speed automatically in response to detection of the plurality of low rotation conditions,

to test for a forced regeneration condition during said low rotation control, and

to execute forced regeneration control when each one of two conditions are concurrently present, a first condition of the two conditions being that low rotation control is being executed, a second condition of the two conditions being that the forced regeneration condition is detected; and

wherein during said forced regeneration control, said control means is configured to modify said low rotation control, while the engine speed is being lowered toward the first low rotating speed, to a second rotation control for achieving a second low rotating speed, which is higher than the first low rotating speed, said second rotation control for suppressing a reduction of temperature of the exhaust gas so that filter regeneration may occur;

wherein, when said second rotation control ends in response to a termination of said filter forced regeneration condition before completion of said low rotation control, the control means is configured to resume lowering the engine speed to the first low rotating speed; and

wherein the control means is further configured to achieve and maintain the engine speed at the first low rotating speed when the filter forced regeneration condition is not detected, and

to adjust the engine speed back toward the operating rotating speed that prevailed before the low rotation conditions and the filter forced regeneration condition were established only after the low rotation conditions and forced regeneration condition have ended.

2. An engine device comprising:

an engine which serves as a power source;

an exhaust gas purifying filter device which is arranged in an exhaust gas path of the engine;

a control means which is configured to detect a forced regeneration condition of the filter device and to execute a forced regeneration control of the filter device; and

a forced low rotation switch coupled to the control means and that causes execution of a forced low rotation control by the control means which forcibly lowers the engine speed toward a predetermined low rotating speed; and

wherein the control means is configured to test for said forced regeneration condition during said forced low rotation control, while the engine speed is being lowered toward the first low rotating speed;

wherein the control means is configured to execute the forced regeneration control upon detection of two conditions being concurrently present, a first of the two conditions being that said low rotation control is being executed, and a second of the two conditions being that the filter forced regeneration condition is detected during said test for said forced regeneration condition;

wherein during said forced regeneration control, said control means is configured to modify said forced low rotation control to achieve a second low rotating speed, which is higher than the first low rotating speed, said forced regeneration control for suppressing a reduction of temperature of the exhaust gas so that filter regeneration may occur; and

wherein, when said forced regeneration control ends in response to a termination of said filter forced regeneration condition before completion of said low rotation control, the control means being configured to resume lowering the engine speed to the first low rotating speed.