WO2009128300A1

WO2009128300A1 - Diesel engine

Info

Publication number: WO2009128300A1
Application number: PCT/JP2009/054136
Authority: WO
Inventors: 宏司増田
Original assignee: ヤンマー株式会社
Priority date: 2008-04-17
Filing date: 2009-03-05
Publication date: 2009-10-22
Also published as: JP2009257220A; JP5244443B2

Abstract

An exhaust purifying device in which, when a diesel particulate filter becomes automatically regenerated, a worker does not erroneously perceive that the engine has an abnormality because of a change in operating conditions of the engine. A diesel engine (2) is provided with a diesel particulate filter (10), an accumulation amount detecting means for detecting the amount of accumulation of particulates, a controlling means for automatically regenerating the diesel particulate filter (10), and a speaker (43) for providing information relating to regeneration of the diesel particulate filter (10). When automatically performing regeneration of the diesel particulate filter (10), an ECU (30) provides, by means of the speaker (43), information relating to the regeneration of the diesel particulate filter (10) and automatically starts the regeneration of the diesel particulate filter (10) after a predetermined time t1 after providing the information.

Description

diesel engine

The present invention relates to a diesel engine.

Conventionally, a diesel particulate filter provided in the middle of an exhaust passage of a diesel engine for recovering particulates contained in exhaust gas is known. Further, a technique for burning and removing particulates collected and accumulated in a diesel particulate filter with exhaust gas is also known. However, when the load of the diesel engine is small or the temperature of the exhaust gas is low, there is a problem that the particulates are not burned and removed.

The diesel engine disclosed in Japanese Patent Application Laid-Open No. 2004-176596 detects the amount of deposit by detecting the differential pressure between the inlet and outlet of the diesel particulate filter. The exhaust gas temperature is adjusted by adjusting the intake air amount, adjusting the fuel injection timing, adjusting the engine load, etc., and the particulates accumulated on the diesel particulate filter can be automatically burned and removed.

However, in the diesel engine disclosed in Japanese Patent Application Laid-Open No. 2004-176596, the operating state fluctuates due to the temperature adjustment control of the exhaust gas, the engine vibration or the engine operating sound fluctuates, and the operator misidentifies that the engine is abnormal. It is disadvantageous in terms.

The present invention has been made in view of the situation as described above, and when the diesel particulate filter is automatically regenerated, the operator misidentifies that the engine is abnormal due to fluctuations in the operating state of the engine. It is an object of the present invention to provide an exhaust purification device that can be prevented.

A diesel engine according to the present invention includes a diesel particulate filter disposed in an exhaust path for collecting particulates in exhaust gas, and a deposit amount for detecting a deposit amount of the particulates collected by the diesel particulate filter. A control unit that recognizes the accumulation amount of particulates detected by the detection unit and the accumulation amount detection unit, and automatically regenerates the diesel particulate filter if the accumulation amount of the particulates is a predetermined amount or more. And a notification means for notifying information about regeneration of the diesel particulate filter by the control means, wherein the control means automatically performs regeneration of the diesel particulate filter. Before by the notification means It notifies the information about the regeneration of the diesel particulate filter, after the lapse of a predetermined period of time, automatically starting the regeneration of the diesel particulate filter.

In the diesel engine of the present invention, the notification means is recognized by hearing, after the diesel engine is started, and when the diesel particulate filter is automatically regenerated at least once, It is preferable to provide a selection means for selecting whether or not to notify the information on regeneration of the diesel particulate filter by the notification means.

In the diesel engine of the present invention, when the engine torque value of the diesel engine before automatically regenerating the diesel particulate filter is greater than or equal to a reference value, the regeneration of the diesel particulate filter by the notification means It is preferable not to notify the information.

According to the diesel engine of the present invention, when the diesel particulate filter is automatically regenerated, it is possible to prevent the operator from misidentifying that the engine is abnormal due to fluctuations in the operating state of the engine.

The block diagram which shows the structure of the diesel engine which concerns on this invention. Similarly the structure of a display. The flowchart which similarly shows reproduction | regeneration control.

The diesel engine 2 will be described with reference to FIG.
The diesel engine 2 includes a diesel particulate filter 10, an engine control unit (hereinafter referred to as ECU) 30 as control means, and a display 42 and a speaker 43 as notification means.

The diesel particulate filter 10 is disposed in the exhaust path 2b of the diesel engine 2 and removes particulates (e.g., carbonaceous soot, high-boiling hydrocarbon components (SOF)) in the exhaust gas. Specifically, the diesel particulate filter 10 has a honeycomb structure including a porous wall made of ceramic or the like, and the exhaust gas is necessarily discharged after passing through the porous wall. When the exhaust gas passes through the porous wall, particulates in the exhaust gas are collected on the porous wall. As a result, the particulates are removed from the exhaust gas.

The upstream-side pressure sensor 20a, the downstream-side pressure sensor 20b, and the temperature sensor 20c as accumulation amount detection means have a function of detecting the accumulation amount of particulates in the diesel particulate filter 10. The upstream pressure sensor 20 a is disposed on the upstream side of the diesel particulate filter 10, and the downstream pressure sensor 20 b is disposed on the downstream side of the diesel particulate filter 10. The temperature sensor 20 c detects the exhaust gas temperature of the diesel particulate filter 10.

The

fuel injection valves

32, 32,... Are constituted by electromagnetic valves or the like, and directly inject fuel into a plurality of cylinders configured in the diesel engine 2.

The intake throttle valve 33 is provided with a valve body that is opened and closed by an electromagnetic valve or an actuator, and is disposed in the intake path 2a of the diesel engine 2 to adjust the air inflow amount of the diesel engine 2.

The upstream side exhaust throttle valve 34a includes a valve body that is opened and closed by an electromagnetic valve or an actuator, and is disposed upstream of the diesel particulate filter 10 and adjusts the exhaust gas inflow amount of the diesel particulate filter 10. It is.

The downstream side exhaust throttle valve 34b is provided with a valve body that is opened and closed by an electromagnetic valve or an actuator, and is disposed on the downstream side of the diesel particulate filter 10 to adjust the exhaust gas outflow amount of the diesel particulate filter 10. It is.

The engine speed sensor 35 is disposed in the vicinity of the flywheel as an engine speed detection means, and detects the rotation angle and speed of the crankshaft.

The accelerator lever 36 has a function of setting the engine speed as engine speed setting means. The control lever may be engine speed setting means.

Details of the display 42 and the speaker 43 will be described later.

The ECU 30 has a function of calculating an engine operating state as a control means. The engine operating state means engine speed, engine torque, and engine load.
The engine torque or load can be calculated by acquiring the rotational speed of the diesel engine 2 detected by the engine rotational speed sensor 35 and the rotational speed setting value of the diesel engine 2 set by the accelerator lever 36.

The ECU 30 has a function of detecting the amount of particulates accumulated on the diesel particulate filter 10 by the upstream pressure sensor 20a, the downstream pressure sensor 20b, and the temperature sensor 20c described above. Specifically, the ECU 30 detects the differential pressure before and after the diesel particulate filter 10 by the upstream pressure sensor 20a and the downstream pressure sensor 20b, detects the exhaust gas temperature by the temperature sensor 20c, and uses these physical quantities as the parameters. Detects the amount of curate deposited.

The ECU 30 has a function of executing an optimal regeneration mode depending on the engine operating state and regenerating the particulates deposited on the diesel particulate filter 10. The reproduction mode means that a plurality of reproduction methods are controlled in combination.

As a regeneration method, the ECU 30 changes the opening degree of the intake throttle valve 33 to increase the exhaust pressure or exhaust temperature of the exhaust gas to regenerate the particulate, the upstream exhaust throttle valve 34a or the downstream exhaust throttle. Exhaust gas exhaust by changing the opening of the valve 34b to regenerate particulates by increasing the exhaust pressure or exhaust temperature of the exhaust gas, or by multi-injection or post-injection by changing the fuel injection timing It has functions such as a method of regenerating particulates by increasing the pressure and exhaust temperature.

The display 42 and the speaker 43 will be described with reference to FIG.
The display 42 has a function of notifying an operator of information about regeneration of the diesel particulate filter 10 with visual information as a notification unit. The speaker 43 has a function of notifying an operator of information about reproduction of the diesel particulate filter 10 by auditory information as a notification means.
Here, the information on regeneration of the diesel particulate filter 10 refers to at least one of the above-described regeneration method, regeneration method change, regeneration mode, regeneration mode change, regeneration start, or regeneration end information. .

The display 42 displays

specific regeneration methods

44a, 44b, 44c, 44d, and 44e of the diesel particulate filter 10,

lamps

45a, 45b, 45c, 45d, and 45e for each regeneration method, and sound as selection means. A switch 43a is arranged.

When the regeneration of the diesel particulate filter 10 is performed, the lamp corresponding to the regeneration method of the diesel particulate filter 10 determined by the ECU 30 blinks, and after the predetermined time t1 (see FIG. 3) has elapsed, the diesel particulate filter 10 The lamp is turned on when the reproduction of the video is started.

When the regeneration method is changed, the lamp corresponding to the regeneration method of the diesel particulate filter 10 determined by the ECU 30 blinks, and the regeneration method of the diesel particulate filter 10 is changed after a predetermined time t1 has elapsed. In addition, the lamp is turned on.

Further, when regeneration ends, a lamp indicating a regeneration method of the diesel particulate filter 10 blinks, and after a predetermined time t1, the regeneration of the diesel particulate filter 10 is terminated and the lamp is turned off. The However, the display method is not limited to the present embodiment, and the display method may be configured so that the color of the lamp changes.

The voice switch 43 a is turned on to notify information about the regeneration of the diesel particulate filter 10 by the speaker 43, and is turned off to not notify the information about the regeneration of the diesel particulate filter 10 by the speaker 43. is there.

The notification unit according to the present invention is not limited to the configuration shown in FIG. 2A, and the ECU 30 displays the playback mode on the playback mode display unit 47 as shown in the display 46 (see FIG. 2B). At the same time, the regeneration state display unit 48 may display the regeneration state of the diesel particulate filter 10. For example, the regeneration mode 2 is a regeneration mode that combines a regeneration method by changing the opening of the intake throttle valve 33 and a regeneration method by changing the opening of the upstream exhaust throttle valve 34a or the downstream exhaust throttle valve 34b. .

Thus, even if the regeneration of the particulates is automatically performed and the operation state of the diesel engine 2 fluctuates, the operator can regenerate the diesel particulate filter 10 by the display 42 or the speaker 43. Can be recognized. Therefore, it is possible to prevent the operator from feeling uneasy or uncomfortable due to fluctuations in the operating state of the diesel engine 2 and prevent the operator from misidentifying that the diesel engine 2 is abnormal.

The reproduction control will be described with reference to FIG.
The ECU 30 executes regeneration control for regenerating the particulates accumulated on the diesel particulate filter 10 according to the following flow.

In step S410, when the diesel engine 2 is started, the ECU 30 sets the flag N to N = 0, and then proceeds to step S420.

In step S420, the ECU 30 proceeds to step S430 after detecting the accumulated amount of particulates in the diesel particulate filter 10 by the accumulation amount detecting means described above.

In step S430, the ECU 30 determines whether regeneration of the diesel particulate filter 10 is necessary from the amount of accumulated particulates. As a result, the ECU 30 proceeds to step S440 when the regeneration of the diesel particulate filter 10 is necessary. Further, the ECU 30 proceeds to step S420 when the regeneration of the diesel particulate filter 10 is not necessary.

In step S440, the ECU 30 sets the diesel particulate filter 10 more appropriate than the engine operating state calculated from the rotational speed of the diesel engine 2 acquired from the engine rotational speed sensor 35 and the rotational speed setting value of the diesel engine 2 acquired from the accelerator lever 36. After determining the reproduction method, the process proceeds to step S450.

In step S450, the ECU 30 calculates the engine torque fluctuation value L of the diesel engine 2 from the engine operating state, and determines whether or not it is greater than or equal to the reference value L1. As a result, when the engine torque fluctuation value L of the diesel engine 2 is smaller than the reference value L1, the ECU 30 proceeds to step S460. In addition, when the engine torque fluctuation value L of the diesel engine 2 is greater than or equal to the reference value L1, the ECU 30 proceeds to step S480.

In step S470, the ECU 30 notifies the regeneration of the diesel particulate filter 10 through the speaker 43, and then proceeds to step S480.

In step S480, the ECU 30 notifies the method of regenerating the diesel particulate filter 10 through the display 42, and then proceeds to step S490.

In this way, when a torque fluctuation exceeding the reference value occurs due to running on a slope or an increase in load, the exhaust temperature rises and regeneration is also performed, but this torque fluctuation is easily recognized by the operator. , There is no need to notify, it is possible to eliminate misunderstandings by eliminating unnecessary notifications.

In step S460, the ECU 30 determines whether the voice switch 43a is on.
Here, the ECU 30 proceeds to step S470 when the voice switch 43a is on. On the other hand, when the voice switch 43a is not turned on, the ECU 30 proceeds to step S461.

In step S461, the ECU 30 determines whether or not the flag N is N = 0. As a result, if the flag N is N = 0, the regeneration of the diesel particulate filter 10 is performed for the first time after the diesel engine 2 is started. Therefore, the ECU 30 determines that notification by the speaker 43 is necessary and proceeds to step S470. . If the flag N is not N = 0, the ECU 30 proceeds to step S480.

In this way, when the worker does not feel uncomfortable with fluctuations in the operating state of the diesel engine 2 due to the regeneration of the diesel particulate filter 10, the regeneration of the diesel particulate filter 10 for the second and subsequent times is started or regenerated. Whether the change of the method or the end of the reproduction is automatically executed can be selected to stop the notification if it can be easily determined, and can be selected to be notified if it cannot be determined. Therefore, since the operator can select whether or not to make a notification as necessary and the troublesomeness of the notification can be eliminated, either the start of regeneration of the diesel particulate filter 10, the change of the regeneration method, or the end of regeneration is performed. One or more than one need not be aware of more than necessary.

In step S490, the ECU 30 determines whether or not a predetermined time t1 has elapsed since the display 42 notified the regeneration method of the diesel particulate filter 10. As a result, the ECU 30 proceeds to step S500 when the predetermined time t1 has elapsed. If the predetermined time t1 has not elapsed, the ECU 30 proceeds to step S490.

In this way, the regeneration of the diesel particulate filter 10 can be recognized immediately before the regeneration method is changed or the regeneration method is changed or the regeneration is finished, and even if the operating state of the diesel engine 2 suddenly fluctuates. The cause can be easily understood, and the occurrence of anxiety and discomfort caused by the operator due to the change in the operating state of the diesel engine 2 can be prevented, and the misperception that the diesel engine 2 is abnormal can be prevented.

In step S500, the ECU 30 performs regeneration of the diesel particulate filter 10, and then proceeds to step S510.

In step S510, the ECU 30 detects the accumulated amount of particulates in the diesel particulate filter 10 from the accumulated amount detecting means, and then proceeds to step S520.

In step S520, the ECU 30 determines whether regeneration of the diesel particulate filter 10 has been completed from the amount of accumulated particulates. As a result, when the regeneration of the diesel particulate filter 10 is completed, the ECU 30 proceeds to step S530. If the regeneration of the diesel particulate filter 10 has not been completed, the ECU 30 proceeds to step S521.

In step S521, the ECU 30 regenerates the diesel particulate filter 10 from the engine operating state calculated from the rotational speed of the diesel engine 2 acquired from the engine rotational speed sensor 35 and the rotational speed setting value of the diesel engine 2 acquired from the accelerator lever 36. Determine if a method change is required. As a result, the ECU 30 proceeds to step S522 when a change in the regeneration method of the diesel particulate filter 10 is necessary. In addition, when it is not necessary to change the regeneration method of the diesel particulate filter 10, the ECU 30 proceeds to step S500.

In step S522, the ECU 30 determines an appropriate regeneration method of the diesel particulate filter 10 from the calculated engine operating state, and then proceeds to step S523.

In step S523, the ECU 30 notifies the regeneration method of the diesel particulate filter 10 through the display 42, and then proceeds to step S500.

In step S530, the ECU 30 notifies the completion of regeneration of the diesel particulate filter 10 through the display 42, and then proceeds to step S540.

In step S540, after completing the regeneration of the diesel particulate filter 10, the ECU 30 sets the flag N to N = 1 and proceeds to step S420.

The present invention can be used for a diesel engine.

Claims

A diesel particulate filter disposed in the exhaust path to collect particulates in the exhaust gas;
A deposition amount detecting means for detecting a deposition amount of the particulates recovered by the diesel particulate filter;
Recognizing the accumulated amount of particulates detected by the accumulated amount detecting means, and if the accumulated amount of the particulates is not less than a predetermined amount, a control means for automatically regenerating the diesel particulate filter;
Notification means for notifying information about regeneration of the diesel particulate filter by the control means;
A diesel engine having
The control means includes
When the regeneration of the diesel particulate filter is performed automatically, the notification means notifies the information about the regeneration of the diesel particulate filter, and after a predetermined period, the regeneration of the diesel particulate filter is automatically performed. Diesel engine characterized by starting.
The notification means is recognized by hearing;
After the diesel engine is started and when the diesel particulate filter is automatically regenerated at least once, the information about the regeneration of the diesel particulate filter by the notification means is notified, or The diesel engine according to claim 1, further comprising selection means for selecting not to be notified.
The control means includes
When the engine torque value of the diesel engine before automatically regenerating the diesel particulate filter is greater than or equal to a reference value, information on regeneration of the diesel particulate filter by the notification means is not notified. The diesel engine according to claim 1 or 2.