WO2022191307A1

WO2022191307A1 - Monitoring device and vehicle

Info

Publication number: WO2022191307A1
Application number: PCT/JP2022/010797
Authority: WO
Inventors: 佑樹菅谷; 正敏原
Original assignee: いすゞ自動車株式会社
Priority date: 2021-03-11
Filing date: 2022-03-11
Publication date: 2022-09-15
Also published as: JP7439782B2; JP2022138960A

Abstract

With this monitoring device and vehicle, it is possible to prevent dilution of engine oil in advance. This monitoring device monitors the amount of ash deposited on a filter disposed in an exhaust passage of an internal combustion engine. The monitoring device comprises a first deposited amount calculation unit that calculates a first deposited amount of a deposit deposited in the filter on the basis of a pressure difference that is the difference between pressure on an exhaust upstream side of the filter and pressure on an exhaust downstream side, a second deposited amount calculation unit that calculates a second deposited amount of the deposit deposited in the filter on the basis of the history of the operating status of the internal combustion engine, and a monitoring unit that monitors the amount of ash on the basis of the ratio of the first deposited amount relative to the second deposited amount.

Description

Surveillance equipment and vehicles

The present disclosure relates to monitoring devices and vehicles.

In general, the exhaust passage of an internal combustion engine is provided with an exhaust purification device such as a PM filter that collects PM (Particulate Matter) contained in the exhaust.

Since this type of PM filter has an upper limit to the amount of PM that can be captured (the mass of PM), regeneration is performed by burning and removing PM in the PM filter (see Patent Document 1, for example).

When regenerating the PM filter, generally, the operating conditions of the internal combustion engine _are changed to raise the temperature of the exhaust gas. Burn off (hereinafter referred to as "forced regeneration"). As a method for raising the temperature of the exhaust gas, for example, the injection amount of HC (Hydrocarbons), which is the fuel injected from the injector, is increased, and the HC is injected by an oxidation catalyst disposed in front of the PM filter or supported by the PM filter. is oxidized and the heat of HC oxidation generated by the oxidation catalyst is used.

Japanese Patent Application Laid-Open No. 2015-172341

By the way, in this type of PM filter, as the traveling distance and the traveling time of the vehicle become longer, not only the deposition of PM of the soot component but also the ash caused by the engine oil component (for example, CaSO ₄ ) contained in the exhaust gas. (ash-like matter) is known to accumulate. In the following description, PM and ash deposited on the PM filter may be referred to as "deposits".

Such ash is not removed even during forced regeneration of PM, and continues to accumulate in the PM filter. Ash deposited in the PM filter increases the number of times of forced regeneration. Part of the fuel injected during forced regeneration travels along the cylinder wall and enters the oil pan, causing a problem of engine oil dilution.

In order to prevent engine oil dilution, it is necessary to encourage vehicle passengers to replace the PM filter or wash the ash.

An object of the present disclosure is to provide a monitoring device and a vehicle that can prevent engine oil dilution.

To achieve the above objectives, the monitoring device in the present disclosure
A monitoring device for monitoring the amount of ash deposited on a filter arranged in an exhaust passage of an internal combustion engine,
a first deposition amount calculation unit that calculates a first deposition amount of deposits deposited in the filter based on a pressure difference that is the difference between the pressure on the upstream side of the exhaust gas and the pressure on the downstream side of the filter;
a second deposit amount calculator that calculates a second deposit amount of deposits deposited in the filter based on the history of the operating state of the internal combustion engine;
a monitoring unit that monitors the amount of ash based on the ratio of the first deposition amount to the second deposition amount;
Prepare.

A vehicle in the present disclosure is
A monitoring device as described above.

According to the present disclosure, engine oil dilution can be prevented.

FIG. 1 is a diagram showing the configuration of a vehicle according to one embodiment of the present disclosure. FIG. 2 is a block diagram showing the configuration of an ECU according to one embodiment of the present disclosure. FIG. 3 is a diagram showing the ratio of the first deposition amount to the second deposition amount. FIG. 4 is a diagram showing the relationship between travel distance and regeneration interval. FIG. 5 is a flow chart showing the operation of the ECU according to one embodiment. FIG. 6 is a diagram showing the relationship between the travel distance and the soot deposit amount. FIG. 7 is a diagram showing the relationship between the travel progress rate and the accumulation progress rate.

Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. In the present specification and drawings, constituent elements having substantially the same functions are denoted by the same reference numerals, thereby omitting redundant description.

[Vehicle configuration]
A configuration of a monitoring apparatus according to an embodiment will be described below with reference to FIG. In this embodiment, a mode in which the monitoring device of the present invention is applied to a diesel engine vehicle will be described.

FIG. 1 is a diagram showing the configuration of a vehicle 1 according to one embodiment of the present disclosure.

The vehicle 1 according to this embodiment includes an engine 10, an intake passage 20, an exhaust passage 30, an air cleaner 21, a turbocharger 22, an intake throttle valve 23, an EGR device 31, an exhaust purification system 40, an ECU 50 (Electronic Control Unit), and the like. Consists of

The engine 10 includes combustion chambers, injectors (not shown), and the like. The engine 10 generates power for the vehicle 1 by repeating an air intake stroke, an air compression stroke, a combustion gas expansion stroke, and a combustion gas exhaust stroke in the combustion chamber.

The engine 10 changes the fuel injection mode or the like of the injector to a low fuel consumption/low exhaust gas operation mode (hereinafter referred to as "normal operation") in which fuel consumption is prioritized, or a forced regeneration operation mode in which the PM filter 42 is forcibly regenerated. configured to be switchable.

The engine 10 according to the present embodiment is a four-cylinder engine, and the intake passage 20 branches into four combustion chambers via an intake manifold, and the four combustion chambers join the exhaust passage 30 via an exhaust manifold. It is configured to

The intake passage 20 is an intake pipe that takes in fresh air (air) from an intake port 20 a on the upstream side and supplies the fresh air to the engine 10 . In the intake passage 20, an air cleaner 21, a compressor of a turbocharger 22, an intake throttle valve 23, and the like are provided in this order from an intake port 20a on the upstream side to the combustion chamber.

The exhaust passage 30 is an exhaust pipe that discharges post-combustion exhaust from the engine 10 to the outside of the vehicle 1 . In the exhaust passage 30, an EGR device 31, a turbine of the turbocharger 22, an exhaust purification system 40, and the like are provided in this order from the engine 10 toward the downstream side.

The exhaust purification system 40 includes an oxidation catalyst 41 , a PM filter 42 , a differential pressure sensor 43 , an oxygen concentration sensor 44 and a temperature sensor 45 .

The oxidation catalyst 41 oxidizes and removes unburned fuel hydrocarbons and carbon monoxide contained in the exhaust gas. The oxidation catalyst 41 may be any known oxidation catalyst such as platinum or cerium oxide. For example, porous ceramics such as cordierite and silicon carbide are used, and catalyst components are supported on these. .

The oxidation catalyst 41 is arranged adjacent to the upstream side of the PM filter 42 in the exhaust passage 30 . When the PM filter 42 is forcibly regenerated, the oxidation catalyst 41 also functions to oxidize hydrocarbons (HC) in the unburned fuel discharged from the engine 10 side and increase the temperature of the exhaust gas by the heat of oxidation. do.

The PM filter 42 (corresponding to the "filter" of the present invention) captures PM contained in the exhaust. As the PM filter 42, a porous ceramic such as cordierite or silicon carbide is typically used as a material. The PM filter 42 has, for example, a honeycomb structure in which inlets and outlets are alternately plugged so that exhaust gas passes through collection walls made of the porous ceramic.

The differential pressure sensor 43 detects the differential pressure across the PM filter 42 (the pressure difference between the pressure on the upstream side and the pressure on the downstream side of the PM filter 42). The oxygen concentration sensor 44 detects the oxygen concentration of exhaust gas on the inlet side of the oxidation catalyst 41 . A temperature sensor 45 detects the temperature of exhaust gas on the inlet side of the oxidation catalyst 41 . These sensors can be realized with any known sensors.

The differential pressure sensor 43, the oxygen concentration sensor 44, and the temperature sensor 45 each transmit sensor information (hereinafter abbreviated as "sensor information") related to sensor values detected by themselves to the ECU 50.

The ECU 50 includes an electronic control unit that performs regeneration control of the PM filter 42 and the like. The ECU 50 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an input port, an output port, and the like. The ECU 50 communicates with each part of the vehicle 1 to control them and receive data from them. Further, the ECU 50 acquires sensor information from various sensors (in this embodiment, the differential pressure sensor 43, the oxygen concentration sensor 44, and the temperature sensor 45) provided in the vehicle 1, and controls the exhaust purification system 40 and the vehicle 1. It detects the state of each part of Dotted arrows in FIG. 1 indicate signal paths.

[Configuration of ECU]
Here, an example of the configuration of the ECU 50 (corresponding to the "monitoring device" of the present invention) according to this embodiment will be described with reference to FIG.

FIG. 2 is a block diagram showing the configuration of the ECU 50 according to this embodiment.

The ECU 50 includes a first accumulation amount calculation section 51 , a second accumulation amount calculation section 52 , a determination section 53 , a filter regeneration control section 54 and a monitoring section 55 . The arrows in FIG. 2 indicate signal paths.

The first deposit amount calculation unit 51 calculates the pressure loss caused by deposits (PM and ash) deposited in the PM filter 42 from the differential pressure across the PM filter 42 indicated by the differential pressure sensor 43. , a first deposition amount, which is the mass of PM deposited in the PM filter 42, is calculated.

Because the deposits deposited on the PM filter 42 obstruct the flow of exhaust gas, the differential pressure across the PM filter 42 increases as the PM accumulates on the PM filter 42 . On the other hand, when the PM filter 42 is regenerated, the PM deposited on the PM filter 42 is burned and removed, so the differential pressure across the PM filter 42 becomes smaller.

The first deposition amount calculation unit 51 calculates PM A first deposition amount of the deposit on the filter 42 is calculated. Note that the correspondence relationship between the differential pressure across the PM filter 42 and the first deposition amount of deposits deposited on the PM filter 42 is obtained in advance by experiments or the like, and is stored in a storage unit (eg, ROM) of the ECU 50 or the like. It is

However, since the differential pressure across the PM filter 42 indicated by the differential pressure sensor 43 also includes the pressure loss caused by the ash deposited on the PM filter 42, the first deposit amount calculated by the first deposit amount calculator 51 is It contains an error component caused by ash.

The second deposit amount calculator 52 estimates the second deposit amount deposited on the PM filter 42 based on the history of the operating state of the engine 10 .

The second deposit amount calculation unit 52 determines the operating state of the engine 10 (for example, the fuel injection amount, the engine speed, the engine load, and the EGR rate, etc.), the amount of PM discharged from the engine 10 per unit time is calculated. Then, the second deposit amount calculator 52 calculates the mass of deposits (here, PM) deposited on the PM filter 42 at the present time by accumulating the amount of PM discharged from the engine 10 per unit time. A second deposition amount (soot deposition amount) is calculated.

Further, during filter regeneration, the second deposition amount calculation unit 52 calculates the amount of PM burned and removed from the PM filter 42 per unit time based on the operating state of the engine 10 (for example, the temperature of the exhaust gas and the oxygen concentration of the exhaust gas). Calculate quantity. Then, the second deposition amount calculation unit 52 subtracts the amount of PM to be burned and removed per unit time from the second deposition amount of PM deposited on the PM filter 42 at the start of filter regeneration. A second deposition amount of deposits (here, PM) deposited on the PM filter 42 at the present time is calculated.

Here, the amount of PM discharged from the engine 10 per unit time and the amount of PM burned and removed from the PM filter 42 per unit time are obtained in advance by experiments or the like, and are associated with the operating state of the engine 10. are stored in the storage unit (for example, ROM) of the ECU 50 or the like.

The determination unit 53 determines whether or not the first accumulation amount of PM in the PM filter 42 has exceeded a predetermined threshold. The determination unit 53 transmits the determination result to the filter regeneration control unit 54 . The predetermined threshold value is obtained through experiments, simulations, or the like, and is stored in the storage unit of the ECU 50 or the like.

The filter regeneration control unit 54 receives the determination result from the determination unit 53, and executes forced regeneration of the PM filter 42 when the first deposition amount in the PM filter 42 exceeds a predetermined threshold value. When the PM filter 42 is forcibly regenerated, the filter regeneration control unit 54 outputs a control signal to the engine 10 to operate the engine 10 in the forced regeneration operation mode, thereby forcibly regenerating the PM filter 42. play.

In the forced regeneration operation mode, for example, the engine 10 increases the amount of fuel injected from the injectors or performs multi-injection to increase the amount of HC (hydrocarbons) in the exhaust. As a result, the HC is oxidized by the oxidation catalyst 41, and the heat of HC oxidation by the oxidation catalyst 41 is used to raise the temperature of the exhaust gas to a predetermined temperature (for example, 600° C.). As a result, the PM filter 42 is heated, and the PM in the PM filter 42 is removed by combustion using O ₂ in the exhaust gas.

However, as a method of forced regeneration, it is possible to apply various conventionally known methods. For example, when the vehicle 1 is equipped with an exhaust pipe injector, the filter regeneration control unit 54 causes the exhaust pipe injector to inject the additional fuel instead of injecting the additional fuel in the engine 10 or along with this. You can spray it.

Here, when determining whether or not to forcibly regenerate the PM filter 42, the filter regeneration control unit 54 determines the amount of deposits in the PM filter 42 calculated by the first deposition amount calculation unit 51. Either the first deposition amount or the second deposition amount of the deposits (here, PM) in the PM filter 42 calculated by the second deposition amount calculation unit 52 may be used. A larger value of the second deposition amount may be used. However, in consideration of the respective characteristics of the calculation method of the first accumulation amount by the first accumulation amount calculation unit 51 and the calculation method of the second accumulation amount by the second accumulation amount calculation unit 52, the filter regeneration control unit 54 Either the first deposition amount or the second deposition amount may be selectively used depending on the timing of grasping the deposition amount of the deposit in the filter 42 .

FIG. 3 is a diagram showing the ratio of the first deposition amount to the second deposition amount. The horizontal axis of FIG. 3 indicates the second deposition amount, and the vertical axis indicates the first deposition amount. When the ratio indicated by the slope of the solid line in FIG. 3 is "1", the first deposition amount and the second deposition amount are equal. Further, when the ratio exceeds 1, it means that the first deposition amount is larger than the second deposition amount. Based on the first deposition amount calculated by the first deposition amount calculation unit 51 and the second deposition amount calculated by the second deposition amount calculation unit 52, the monitoring unit 55 calculates the second deposition amount for the second deposition amount. Calculate the ratio of one deposition amount. The monitoring unit 55 calculates the ratio for each predetermined time interval between forced regenerations of the PM filter 42 and in regeneration intervals represented by distances. Then, the monitoring unit 55 monitors the amount of ash (mass of ash) deposited on the PM filter 42 based on the calculated ratio.

In FIG. 3, the slope of the dashed line shows the predetermined threshold of the ratio (Ash warning threshold). When the calculated ratio exceeds a predetermined threshold value (the hatched area in FIG. 3), the monitoring unit 55 outputs information indicating that the amount of ash deposited on the PM filter 42 is excessive (ash deposition warning information). A vehicle ECU (not shown) or the like is notified. A predetermined threshold value may be stored in the storage unit of the ECU 50 .

Note that the monitoring unit 55 may issue an ash accumulation warning when the ratio exceeds a predetermined threshold and when the regeneration interval is equal to or less than a predetermined first distance. A predetermined first distance may be stored in the storage unit of the ECU 50 .

FIG. 4 is a diagram showing the relationship between travel distance and reproduction interval. As shown in FIG. 4, the regeneration interval (first distance) of the ash accumulation warning line is set longer than the regeneration interval (second distance) of the dilution limit line. When the regeneration interval reaches the second distance, the monitoring unit 55 issues a dilution warning indicating that the engine oil of the engine 10 has been diluted. A predetermined second distance may be stored in the storage unit of the ECU 50 . Since the first distance is longer than the second distance, the ash build-up warning will always occur before the dilution warning. On the other hand, if the dilution warning is given before the ash accumulation warning is given, the occupants of the vehicle are encouraged to change the engine oil and then wash the ash. And it will be a hassle twice with the engine oil change. In the present embodiment, the ash accumulation warning can prompt the occupant of the vehicle to wash the ash and replace the engine oil at the same time. Don't waste your time.

Each function of the ECU 46 described above is realized, for example, by the CPU referring to control programs and various data stored in the ROM, RAM, or the like. However, the function is not limited to processing by software, and can of course be realized by a dedicated hardware circuit.

[Operation of ECU]
Next, an example of the operation of the ECU 50 according to this embodiment will be described with reference to FIG. FIG. 5 is a flow chart showing the operation of the ECU 50 according to this embodiment. The flowchart shown in FIG. 5 is, for example, executed by the ECU 50 at predetermined intervals (for example, every 100 ms) according to a computer program. Each function of the determination unit 53 and the monitoring unit 55 will be described as being executed by the ECU 50 .

In step S100, the ECU 50 determines whether the forced regeneration of the PM filter 42 has been completed. Here, when the forced regeneration of the PM filter 42 is completed (S100: YES), the ECU 50 advances the process to step S110. On the other hand, if the forced regeneration of the PM filter 42 is not completed (S100: NO), the ECU 50 terminates the series of processes of the flow in FIG.

In step S<b>110 , the ECU 50 calculates a first deposition amount of deposits in the PM filter 42 using the first deposition amount calculation unit 51 .

Next, in step S<b>120 , the ECU 50 calculates a second deposition amount of deposits in the PM filter 42 using the second deposition amount calculation section 52 .

Next, in step S130, the ECU 50 determines whether or not the ratio of the first accumulation amount to the second accumulation amount exceeds a predetermined threshold. Then, when the ratio exceeds the predetermined threshold value (S130: YES), the ECU 50 advances the process to step S140. On the other hand, if the ratio is equal to or less than the predetermined threshold (S130: NO), the ECU 50 terminates the series of processes of the flow in FIG.

In step S140, the ECU 50, for example, transmits to the vehicle ECU ash accumulation warning information indicating that the amount of ash accumulated on the PM filter 42 is excessive. When the vehicle ECU receives the information from the ECU 50, the vehicle ECU displays the information on the instrument panel or the like of the vehicle 1 to notify the passenger.

The ECU 50 according to the present embodiment prompts the passenger to wash the ash by informing the passenger of the ash accumulation warning information described above. , it is possible to prevent the dilution of the engine oil.

Note that the ECU 50 (monitoring unit 55) determines the first deposition amount (deposition calculated based on the differential pressure across the PM filter) after regeneration of the PM filter 42 is completed when the ratio in the regeneration interval exceeds a predetermined threshold value. amount) is greater than a predetermined value, an ash accumulation warning may be issued. Even if the ratio (the ratio of the first deposition amount to the second deposition amount) exceeds the predetermined threshold value, if the first deposition amount is less than the predetermined value, the engine oil may not be diluted immediately after. This is because the amount of ash deposited on the PM filter 42 is low and the urgency to prompt ash cleaning is also low. By waiting for the first deposition amount to exceed the predetermined value, the certainty that the amount of ash deposited on the PM filter 42 is excessive increases. Therefore, it is possible to accurately give an ash accumulation warning.

Description will be made with reference to FIG. FIG. 3 shows the forced regeneration threshold value as a predetermined value. When the ratio exceeds a predetermined threshold value and the first accumulation amount exceeds the forced regeneration threshold value, the ECU 50 (monitoring unit 55) determines whether the ratio and the first accumulation amount are within the hatched area. , the ECU 50 (filter regeneration control unit 54) performs forced regeneration of the PM filter 42 while issuing an ash accumulation warning.

In the above description, the ECU 50 (monitoring unit 55) issues an ash accumulation warning when the ratio in the regeneration interval (the ratio of the first accumulation amount to the second accumulation amount) exceeds a predetermined threshold value. If the ratio in each regeneration interval also exceeds a predetermined threshold, that is, if the ratio in each adjacent regeneration interval exceeds a predetermined threshold, an ash accumulation warning may be issued.

Description will be made with reference to FIG. FIG. 6 is a diagram showing the relationship between the traveling distance and the amount of accumulated soot. In FIG. 6, the horizontal axis indicates the traveling distance, and the vertical axis indicates the accumulated soot amount, count-up status, error count number, and error status. Note that the upper limit is one count-up per one reproduction interval. The ECU 50 commands an error count up if the ratio exceeds a predetermined threshold. This increments the error count by one. The error status is established when the number of error counts is equal to or greater than a predetermined number of consecutive times. On the other hand, the ECU 50 resets the error count when the discontinuity occurs less than the predetermined number of times. The error count number is stored in the storage section (EEPROM, for example) of the ECU 50 . The error count number and error count status can be monitored by an external tool (eg, instrument panel, etc.). As shown in FIG. 6, the error status becomes "2" after two consecutive error counts, and the ECU 50 issues an ash accumulation warning. Since the number of consecutive error counts increases the certainty that the amount of ash deposited on the PM filter 42 is excessive, it is possible to reliably prevent the engine oil from being diluted.

The ECU 50 (monitoring unit 55) also calculates a travel progress rate indicating the ratio of the traveled distance from the completion of forced regeneration of the PM filter 42 to a predetermined distance regeneration threshold. The ECU 50 (monitoring unit 55) also calculates a deposition progress rate indicating the ratio of the total deposition amount (the deposition amount based on the first deposition amount and the second deposition amount) to a predetermined deposition amount regeneration threshold. Note that the deposition progress rate may be a ratio of a predetermined ratio (the ratio of the first deposition amount to the second deposition amount) to a threshold value. Furthermore, the ECU 50 (monitoring unit 55) calculates the ratio of the accumulation progress rate to the travel progress rate. Note that the distance reproduction threshold value and the accumulation amount reproduction threshold value are obtained through experiments, simulations, or the like, and are stored in the storage unit of the ECU 50 or the like.

Description will be made with reference to FIG. FIG. 7 is a diagram showing the relationship between the travel progress rate and the accumulation progress rate. In FIG. 7, the horizontal axis indicates the travel progress rate [%], and the vertical axis indicates the accumulation progress rate [%]. FIG. 7 shows the predetermined threshold value by the slope of the dashed line. Here, the area exceeding the inclination angle of the dashed line is defined as the dangerous area, and the area below the inclination angle of the dashed line is defined as the safe area. The ECU 50 (monitoring unit 55) issues an ash accumulation warning when the ratio of the accumulation progress rate to the travel progress rate exceeds a predetermined threshold value (when the ratio is within the danger zone). The predetermined threshold value is obtained through experiments, simulations, or the like, and is stored in the storage unit of the ECU 50 or the like. For example, when the running progress rate is low and the amount of accumulated soot is close to the forced regeneration threshold, the ratio is within the danger zone and the risk of engine oil dilution is high, so an ash accumulation warning is issued. On the other hand, even if the differential pressure across the PM filter 42 is high, the ratio is within the safe range and the risk of diluting the engine oil is low, so the ash accumulation warning is not issued. This makes it possible to reliably issue an ash accumulation warning.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and various modifications are conceivable.

In the above-described embodiment, as an example of the configuration of the ECU 50, the functions of the first accumulation amount calculation unit 51, the second accumulation amount calculation unit 52, the determination unit 53, the filter regeneration control unit 54, and the monitoring unit 55 are integrated into a computer. Although described as being implemented by a plurality of computers, it is of course possible. For example, the function of the filter regeneration control unit 54 and the function of the monitoring unit 55 may be installed in separate ECUs.

Also, in the above embodiment, as an example of the vehicle 1 to which the exhaust gas purification system 40 is applied, a mode in which it is applied to a diesel engine vehicle has been described. However, the exhaust purification system 40 according to the present invention can also be applied to a gasoline engine vehicle.

Also, in the above embodiment, as an example of the exhaust gas purification system 40 for an internal combustion engine, a mode applied to a vehicle has been shown. However, the exhaust gas purification system 40 according to the present invention can be applied not only to vehicles but also to other apparatuses having internal combustion engines, such as ships and aircraft.

In addition, the above-described embodiments are merely examples of specific implementations of the present disclosure, and the technical scope of the present disclosure should not be construed to be limited by these. . That is, the present disclosure can be embodied in various forms without departing from its spirit or key features.

This application is based on a Japanese patent application (Japanese Patent Application No. 2021-039140) filed on March 11, 2021, the contents of which are incorporated herein by reference.

The present disclosure is suitably used for vehicles equipped with a monitoring device that requires prevention of engine oil dilution.

1 vehicle 10 engine 20 intake passage 21 air cleaner 22 turbocharger 23 intake throttle valve 30 exhaust passage 31 EGR device 40 exhaust purification system 41 oxidation catalyst 42 PM filter 43 differential pressure sensor 44 oxygen concentration sensor 45 temperature sensor 50 ECU (monitoring device)
51 First accumulation amount calculator 52 Second accumulation amount calculator 53 Judgment unit 54 Filter regeneration control unit 55 Monitoring unit

Claims

A monitoring device for monitoring the amount of ash deposited on a filter arranged in an exhaust passage of an internal combustion engine,
a first deposition amount calculation unit that calculates a first deposition amount of deposits deposited in the filter based on a pressure difference that is the difference between the pressure on the upstream side of the exhaust gas and the pressure on the downstream side of the filter;
a second deposit amount calculator that calculates a second deposit amount of deposits deposited in the filter based on the history of the operating state of the internal combustion engine;
a monitoring unit that monitors the amount of ash based on the ratio of the first deposition amount to the second deposition amount;
comprising
surveillance equipment.
When the ratio in the regeneration interval of the filter exceeds a predetermined threshold, the monitoring unit issues an ash deposition warning indicating that the amount of ash deposited on the filter is excessive.
A monitoring device according to claim 1 .
The monitoring unit issues the ash accumulation warning when the regeneration interval is equal to or less than a predetermined first distance.
3. A monitoring device according to claim 2.
When the regeneration interval is equal to or less than a predetermined second distance that is shorter than the predetermined first distance, the monitoring unit issues a dilution warning indicating that the lubricating oil of the internal combustion engine has been diluted.
4. A monitoring device according to claim 3.
The monitoring unit issues the ash accumulation warning when the ratio in the regeneration interval exceeds a predetermined threshold and the ratio in the regeneration interval next to the regeneration interval exceeds a predetermined threshold.
3. A monitoring device according to claim 2.
further comprising a determination unit that determines whether the first deposition amount after completion of regeneration of the filter is greater than a predetermined value;
The monitoring unit monitors the amount of ash based on the determination result of the determination unit and the ratio.
A monitoring device according to claim 1 .
The monitoring unit sets the accumulation amount based on the first accumulation amount and the second accumulation amount as a total accumulation amount, and the running progress indicates a ratio of the traveling distance from completion of regeneration of the filter to a predetermined distance regeneration threshold value. monitoring the ash amount based on a rate and a deposition progress rate indicating a ratio of the total deposition amount to a predetermined deposition amount regeneration threshold;
A monitoring device according to claim 1 .
A vehicle equipped with the monitoring device according to any one of claims 1 to 7.