Exhaust gas purification system of working machine

Patent metadata

Field	Value
Publication number	US-10371027-B2
Application number	US-201113643664-A
Country	US
Kind code	B2
Filing date	Apr 25, 2011
Priority date	Apr 30, 2010
Publication date	Aug 6, 2019
Grant date	Aug 6, 2019

Abstract

An exhaust gas purification system of a working machine is operable to reduce a loss of a working time caused by a point that it takes a long time to renew an exhaust gas purification device by throttle devices. The exhaust gas purification system of the working machine is provided with a common rail type engine which is mounted to the working machine, an exhaust gas purification device which is arranged in an exhaust system of the engine, and at least one of the intake air throttle device and the exhaust gas throttle device. It is provided with mode selection input means which selects whether an auxiliary renewing mode is executed or a forced renewing mode is executed in the case that a clogged state of the exhaust gas purification device is equal to or more than a prescribed level.

First claim

The invention claimed is:

1. An exhaust gas purification system comprising:
a common rail engine mounted to a working machine;
an exhaust gas purification device coupled to an exhaust system of the common rail engine;
at least one throttle device comprising an intake air throttle device and an exhaust gas throttle device coupled to intake and exhaust systems of the common rail engine; and
an ECU configured to operate the common rail engine in:
an auxiliary renewing mode in which a temperature of exhaust gas is raised based on actuation of the at least one throttle device,
a forced renewing mode in which a fuel is supplied to the common rail engine using an injection timing based on a post injection time; and

a mode selection input means which, in a case that a clogged state of the exhaust gas purification device is equal to or greater than a first prescribed level, is configured to indicate a mode selection between the auxiliary renewing mode or the forced renewing mode;
wherein:
in a case that an accumulated drive time of the common rail engine exceeds a set time, the forced renewing mode is executed regardless of the clogged state of the exhaust gas purification device; and
in a case that the accumulated drive time of the common rail engine is less than the set time and the clogged state of the exhaust gas purification device is greater than or equal to the first prescribed level, either the auxiliary renewing mode or the forced renewing mode is executed based on the indicated mode selection of the mode selection input means; and
when the clogged state of the exhaust gas purification device is not improved after execution of the auxiliary renewing mode, the forced renewing mode is executed regardless of the indicated mode selection of the mode selection input means.

2. The exhaust gas purification system according to claim 1 , wherein a notification is provided before the forced renewing mode is executed.

3. The exhaust gas purification system according to claim 2 , further comprising:
a lamp coupled to the ECU and configured to receive an output of the ECU; and
wherein before the forced renewing mode is executed, the lamp is configured to blink at a first frequency.

4. The exhaust gas purification system according to claim 1 , wherein the ECU is further configured to:
after execution of the auxiliary renewing mode, compare a second particulate matter level of the exhaust gas purification device to a second prescribed level different from the first prescribed level; and
based on the second particulate matter level being greater than or equal to the second prescribed level:
initiate execution of the forced renewing mode regardless of the indicated mode selection; and
generate an output to indicate execution of the forced renewing mode; and
the second prescribed level is less than the first prescribed level.

5. The exhaust gas purification system according to claim 4 , further comprising:
a timer coupled to the ECU and configured to calculate a drive time of the common rail engine; and
wherein, when the drive time of the common rail engine is greater than or equal to a predetermined drive time, the ECU is further configured to initiate execution of the forced renewing mode regardless of a mode selection state.

6. The exhaust gas purification system according to claim 1 , wherein the exhaust gas purification system is structured such that the auxiliary renewing mode is executed regardless of the clogged state of the exhaust gas purification device, in the case that the temperature of the exhaust gas within the exhaust gas purification device is equal to or less than a previously set prescribed temperature.

7. The exhaust gas purification system according to claim 6 , wherein the exhaust gas purification system is structured so as to come back to a normal operation mode after a predetermined time elapses, in the case that the auxiliary renewing mode is executed based on the temperature of the exhaust gas within the exhaust gas purification device.

8. The exhaust gas purification system according to claim 7 , wherein, an executing time of the auxiliary renewing mode based on the temperature of the exhaust gas within the exhaust gas purification device is set shorter than an executing time of the auxiliary renewing mode based on the basis of the clogged state of the exhaust gas purification device.

9. An exhaust gas purification system comprising:
a common rail engine coupled to a work machine;
an exhaust gas purification device coupled to the common rail engine and configured to receive an exhaust gas; and
a throttle device comprising an intake air throttle or an exhaust gas throttle; and
an ECU configured to operate the common rail engine in:
a normal mode;
an auxiliary renewing mode in which a temperature of the exhaust gas is raised based on actuation of the throttle device; and
a forced renewing mode in which a fuel is supplied to the common rail engine using an injection timing based on a post injection time;

wherein the ECU is further configured to:
determine whether a work portion of the work machine is in an operation state or a non-operation state;
based on a determination that the work portion is in the non-operation state, select an operation mode of the common rail engine as one of the auxiliary renewing mode or the forced renewing mode based on a particulate matter level of the exhaust gas purification device being greater than or equal to a first prescribed level;
based on a determination that the work portion is in the operation state:
prohibit operation of the auxiliary renewing mode regardless of whether the particulate matter level of the exhaust gas purification device is greater than or equal to the first prescribed level;
generate an output to indicate the auxiliary renewing mode is not executed based on the work portion being in the operation state;
start a timer; and
enable an operation of the auxiliary renewing mode after a value of the timer is greater than or equal to a predetermined time.

10. The exhaust gas purification system according to claim 9 , further comprising:
a differential pressure sensor coupled to the ECU, the differential pressure sensor configured to measure the particulate matter level; and
wherein, when the output is generated, the ECU is configured to activate a renewal inhibition lamp.

11. The exhaust gas purification system according to claim 9 , further comprising:
the timer coupled to the ECU; and
wherein, after the auxiliary renewing mode is not executed based on the work portion being in the operation state, the ECU is configured to:
initiate execution of the auxiliary renewing mode after the value of the timer is greater than or equal to the predetermined time.

12. An exhaust gas purification system comprising:
a common rail engine coupled to a work machine;
an exhaust gas purification device coupled to the common rail engine and configured to receive an exhaust gas;
a throttle device comprising an intake air throttle or an exhaust gas throttle; and
an ECU configured to operate the common rail engine in:
a normal mode;
an auxiliary renewing mode in which a temperature of the exhaust gas is raised based on actuation of the throttle device, and
a forced renewing mode in which a fuel is supplied to the common rail engine using an injection timing based on a post injection time;

wherein the ECU is further configured to:
in response to a first particulate matter level of the exhaust gas purification device being greater than or equal to a first prescribed level, identify a selected mode between the auxiliary renewing mode or the forced renewing mode; and

Assignees

• Saitou Kenta
• Yanmar Co Ltd

Inventors

• Saitou Kenta

Classifications

• F01N13/0097

  the purifying devices are arranged in a single housing · CPC title

• F01N2900/1602

  Temperature of exhaust gas apparatus · CPC title

• F02D41/025

  by changing the composition of the exhaust gas, e.g. for exothermic reaction on exhaust gas treating apparatus · CPC title

• F02D41/1448

  the characteristics being an exhaust gas pressure · CPC title

• F01N3/035

  with catalytic reactors · CPC title