WO2018021087A1

WO2018021087A1 - Method for estimating degree of deterioration of engine oil in diesel engine

Info

Publication number: WO2018021087A1
Application number: PCT/JP2017/025890
Authority: WO
Inventors: 幸実山崎
Original assignee: いすゞ自動車株式会社
Priority date: 2016-07-28
Filing date: 2017-07-18
Publication date: 2018-02-01
Also published as: JP6724632B2; CN109477405A; PH12019500166A1; CN109477405B; JP2018017177A

Abstract

This method for estimating the degree of deterioration of engine oil in a diesel engine 10 includes: a step of creating an engine oil deterioration map which defines, in association with a diesel engine load, an engine oil degree of deterioration which takes into account the effects of the injection end timing of main injection in the diesel engine, and the effects of the amount of smoke in exhaust gas from the diesel engine; a step of creating a load frequency map defining a load frequency of the diesel engine; and a step of estimating the engine oil degree of deterioration taking into account the injection end timing of main injection, the amount of smoke in the exhaust gas, and the load, on the basis of the engine oil deterioration map and the load frequency map.

Description

Diesel engine oil degradation degree estimation method

The present disclosure relates to an engine oil deterioration degree estimation method for a diesel engine and a control unit that controls the operation of the diesel engine.

Conventionally, a technique for estimating the degree of deterioration of engine oil of a diesel engine is known (see, for example, Patent Document 1). Specifically, this Patent Document 1 discloses that the degree of deterioration of engine oil is affected by the injection end timing of the main injection of the diesel engine, and also considers the injection end timing of the main injection. A technique for estimating the degree of deterioration of engine oil is disclosed.

Japanese Unexamined Patent Publication No. 2002-276327

The degree of deterioration of diesel engine engine oil is affected by the injection end timing of main injection as described above, but is also affected by the amount of smoke in the exhaust and the load of the diesel engine. However, conventionally, no technology has been developed for estimating the degree of deterioration of engine oil in consideration of the injection end timing of main injection, the amount of smoke in the exhaust, and the load on the diesel engine. Therefore, it cannot be said that the conventional technique can accurately estimate the degree of deterioration of the engine oil.

The present disclosure has been made in view of the above, and an object thereof is to provide a method for estimating the engine oil deterioration level of a diesel engine that can accurately estimate the deterioration level of the engine oil of the diesel engine. is there.

In order to achieve the above object, an engine oil deterioration degree estimation method for a diesel engine according to the present disclosure is a method for estimating a deterioration degree of engine oil of a diesel engine, the injection end timing of the main injection of the diesel engine, and the Creating an engine oil deterioration map in which the degree of deterioration of the engine oil in consideration of the influence of the smoke amount in the exhaust of the diesel engine is related to the load of the diesel engine; and a vehicle equipped with the diesel engine Creating a load frequency map that defines a load frequency indicating the degree of occurrence of the load per unit travel distance, an injection end timing of the main injection based on the engine oil deterioration map and the load frequency map, The amount of smoke in the exhaust and the load Estimating a deterioration degree of consideration has been the engine oil, it contains.

Further, the method for estimating the degree of engine oil deterioration of a diesel engine according to the present disclosure includes the deterioration of the engine oil in consideration of the injection end timing of the main injection of the diesel engine and the influence of the smoke amount in the exhaust of the diesel engine. A step that refers to an engine oil deterioration map that is defined in relation to the load of the diesel engine, and a load that defines a load frequency indicating a degree of occurrence of the load per unit travel distance of a vehicle on which the diesel engine is mounted. Based on the frequency map, the engine oil deterioration map, and the load frequency map, the injection end timing of the main injection, the amount of smoke in the exhaust, and the load of the engine oil in consideration of the load Estimating the degree of deterioration.

The control device for controlling the operation of the diesel engine according to the present disclosure includes a processor and a memory. In the memory, (1) the degree of deterioration of the engine oil considering the injection end timing of the main injection of the diesel engine and the amount of smoke in the exhaust of the diesel engine is used as the load of the diesel engine. An engine oil deterioration map defined in association with each other and (2) a load frequency map defining a load frequency indicating the degree of occurrence of the load per unit travel distance of a vehicle on which the diesel engine is mounted are stored. The processor is operative to perform processing including: reading the engine oil deterioration map from the memory; reading the load frequency map from the memory; based on the engine oil deterioration map and the load frequency map Then, the degree of deterioration of the engine oil is estimated.

According to the present disclosure, the three factors that affect the degree of deterioration of the engine oil of the diesel engine are all the injection end timing of the main injection of the diesel engine, the amount of smoke in the exhaust of the diesel engine, and the load of the diesel engine. In view of this, the degree of deterioration of the engine oil of the diesel engine can be estimated, so that the degree of deterioration of the engine oil of the diesel engine can be estimated with high accuracy.

FIG. 1 is a configuration diagram schematically showing a configuration of a diesel engine and its surroundings in a vehicle equipped with the diesel engine according to the embodiment. FIG. 2A is a schematic diagram for explaining the influence of the injection end timing of the main injection on the deterioration degree of the engine oil. FIG. 2B is a schematic diagram for explaining the influence of the amount of smoke in exhaust gas on the degree of deterioration of engine oil. It is a flowchart which shows a series of flows of the engine oil degradation degree estimation method which concerns on embodiment. FIG. 4A is a diagram showing an example of the engine oil deterioration map created in step S20. FIG. 4B is a diagram illustrating an example of a load frequency map created in step S30.

Hereinafter, an engine oil deterioration degree estimation method for the diesel engine 10 according to an embodiment of the present disclosure will be described with reference to the drawings. FIG. 1 is a configuration diagram schematically showing a configuration of a diesel engine 10 and its surroundings in a vehicle 1 equipped with a diesel engine 10 according to the present embodiment. The vehicle 1 includes a diesel engine 10, an intake passage 12 through which intake air introduced into each cylinder 11 of the diesel engine 10 passes, an exhaust passage 13 through which exhaust gas discharged from each cylinder 11 of the diesel engine 10 passes, and diesel And a control device 20 for controlling the engine 10.

Although not shown in FIG. 1, an exhaust aftertreatment device is disposed in the exhaust passage 13. Although the specific configuration of the exhaust aftertreatment device is not particularly limited, in the present embodiment, as an example, an oxidation catalyst, an exhaust treatment filter disposed downstream of the oxidation catalyst, and the filter And a NOx selective reduction device that is disposed downstream of the filter and selectively reduces NOx in the exhaust gas that has passed through the filter. In this embodiment, as an example of the NOx selective reduction device, a urea SCR device that selectively reduces NOx in exhaust gas using urea water is used.

The control device 20 includes a CPU 21 that is a processor having a function as a control unit that executes various control processes, and a ROM 22 and a RAM 23 that have a function as a storage unit that stores various information used for the operation of the CPU 21. A microcomputer is provided.

The diesel engine 10 uses engine oil as a lubricating oil for the diesel engine 10. The engine oil deterioration degree estimation method according to the present embodiment is a method for estimating the engine oil deterioration degree of the diesel engine 10.

Next, factors that affect the degree of deterioration of engine oil will be described. Factors affecting the degree of deterioration of the engine oil include the end timing of main injection of the diesel engine 10, the amount of smoke in the exhaust, and the load on the diesel engine 10. FIG. 2A is a schematic diagram for explaining the influence of the injection end timing of the main injection on the deterioration degree of the engine oil, and FIG. 2B explains the influence of the smoke amount in the exhaust on the deterioration degree of the engine oil. It is a schematic diagram for.

As illustrated in FIG. 2A, the deterioration degree of the engine oil tends to increase (that is, the deterioration degree deteriorates) as the injection end timing of the main injection is delayed. Specifically, when the injection end timing of the main injection is later than the predetermined timing (T ₁ ), the degree of deterioration of the engine oil tends to increase rapidly. Further, as illustrated in FIG. 2B, the degree of deterioration of engine oil tends to increase as the amount of smoke in the exhaust increases. Specifically, the amount of smoke in the exhaust gas and the degree of deterioration of the engine oil have a positive proportional relationship. Although not shown, the degree of deterioration of the engine oil is also affected by the load of the diesel engine 10.

In this embodiment, as an example of the degree of deterioration of the engine oil, an index based on the ratio (%) of the carbon amount contained in the engine oil is used. In this case, as the amount of carbon contained in the engine oil increases, the degree of deterioration of the engine oil increases. The degree of deterioration of the engine oil can be obtained by measuring the ratio of the amount of carbon contained in the engine oil. Further, as an example of the amount of smoke in the exhaust, an exhaust FSN (Filter Smoke Number) is used. Specifically, in the present embodiment, as an example of the amount of smoke in the exhaust, the FSN of exhaust in the exhaust passage 13 upstream of the exhaust aftertreatment device is used. The amount of smoke in the exhaust can be obtained by measuring the FSN of the exhaust upstream of the exhaust aftertreatment device.

Subsequently, details of the engine oil deterioration degree estimation method according to the present embodiment will be described. FIG. 3 is a flowchart showing a series of flows of the engine oil deterioration degree estimation method according to the present embodiment. The engine oil deterioration degree estimation method according to the present embodiment includes step S10 to step S40 illustrated in FIG. 3 in this order. In the present embodiment, steps S10 and S20 are performed by a person, and steps S30 and S40 are performed by the control device 20. Note that the processing of step S10 and step S20 may be executed by a computer to which previously measured data is input.

First, in step S10, the relationship between the injection end timing of the main injection of the diesel engine 10 and the degree of deterioration of the engine oil of the diesel engine 10 is measured in association with the load of the diesel engine 10. Based on this measurement result, a map that defines the relationship between the injection end timing of the main injection of the diesel engine 10 and the deterioration degree of the engine oil in association with the load of the diesel engine 10 (referred to as an injection end timing-oil deterioration map). ). Specifically, in step S10, the injection end timing of the main injection and the deterioration degree of the engine oil are measured for each load of the diesel engine 10, and the above-described injection end timing-oil deterioration map is based on the measurement result. Create

In step S10, the relationship between the amount of smoke in the exhaust of the diesel engine 10 and the degree of deterioration of the engine oil is measured, and the proportionality indicating the relationship between the amount of smoke and the degree of deterioration of the engine oil based on the measurement result. Find the coefficient. Then, by multiplying this proportionality coefficient by the smoke map of another measurement (this is a map that is defined separately in association with the amount of smoke in the exhaust, which is measured separately), the exhaust gas is obtained. A map (referred to as a smoke-oil deterioration map) defining the relationship between the amount of smoke in the engine and the degree of deterioration of the engine oil in association with the load of the diesel engine 10 is created.

In the present embodiment, the fuel injection amount and the rotational speed of the diesel engine 10 are used as an example of the load of the diesel engine 10. Further, as an example of the fuel injection amount of the diesel engine 10, the fuel injection amount of the diesel engine 10 per one rotation of the fuel injection pump of the diesel engine 10 is used.

Step S20 is executed after step S10 of FIG. In step S20, based on the injection end time-oil deterioration map and the smoke-oil deterioration map created in step S10, the engine oil in which the influence of the injection end time of main injection and the amount of smoke in the exhaust gas is considered. A map (referred to as an engine oil deterioration map) that defines the degree of deterioration in association with the load of the diesel engine 10 is created.

FIG. 4A is a diagram showing an example of the engine oil deterioration map created in step S20. The rows (200 to 4000) and columns (10 to 100) of the engine oil deterioration map shown in FIG. 4A indicate the load of the diesel engine 10. Specifically, the row (200 to 4000) indicates the rotation speed of the diesel engine 10, and the column (10 to 100) indicates the fuel injection amount of the diesel engine 10 per rotation of the fuel injection pump (from the fuel injection valve in the cylinder 11). Fuel injection amount). These numbers are merely examples, and the rows and columns of the engine oil deterioration map are not limited to these numerical examples. In addition, each numerical value of a _1-1 to a _{20-10 in} the engine oil deterioration map shown in FIG. 4A indicates the degree of deterioration of the engine oil. The unit of each numerical value of a _1-1 to a _20-10 is “% / 100 hr”. The “100 hr” is merely an example of the unit time, and the specific value of the unit time is not limited to this.

The engine oil deterioration map shown in FIG. 4A is created by the following method. Specifically, based on the injection end time-oil deterioration map and smoke-oil deterioration map obtained in step S10, the main oil injection end time and the amount of smoke in the exhaust affect the engine oil deterioration degree. The engine oil deterioration degree in the factor having the larger influence is selected for each load of the diesel engine 10, and the engine oil deterioration map shown in FIG. 4A is created.

More specifically, for example, when the rotation speed of the diesel engine 10 is 1000 and the fuel injection amount is 20 in the injection end time-oil deterioration map and smoke-oil deterioration map created in step S10, the injection end is completed. If the oil deterioration degree obtained from the timing-oil deterioration map is greater than the oil deterioration degree obtained from the smoke-oil deterioration map, select the oil deterioration degree (a _5-2 ) in the injection end time-oil deterioration map. Then, it is adopted as map data for the engine oil deterioration map shown in FIG. 4A. For example, in the case where the rotation speed of the diesel engine 10 is 2000 and the fuel injection amount is 50 out of the injection end time-oil deterioration map and smoke-oil deterioration map created in step S10, it is obtained from the smoke-oil deterioration map. When the oil deterioration degree to be obtained is larger than the oil deterioration degree obtained from the injection end time-oil deterioration map, the oil deterioration degree (a _10-5 ) in the smoke-oil deterioration map is selected and shown in FIG. 4A Adopted as map data for engine oil deterioration map. As described above, the engine oil deterioration map illustrated in FIG. 4A is created.

That is, in step S20 according to the present embodiment, a map that defines the relationship between the injection end timing of main injection and the deterioration degree of engine oil in association with the load of the diesel engine 10 (that is, injection end timing-oil deterioration map) is defined. And a map (that is, a smoke oil deterioration map) in which the relationship between the amount of smoke in the exhaust gas and the degree of deterioration of the engine oil is defined in association with the load of the diesel engine 10 (that is, the smoke oil deterioration map) is generated. An engine oil deterioration map is created by selecting, for each load of the diesel engine 10, the degree of engine oil deterioration for the factor that has the greatest effect on the degree of engine oil deterioration of the injection end timing and the amount of smoke in the exhaust. It corresponds to a step.

The engine oil deterioration map shown in FIG. 4A created in this way shows the deterioration degree of engine oil in consideration of the influence of the end timing of main injection and the amount of smoke in the exhaust on the deterioration degree of engine oil. The engine oil deterioration map is defined in association with the load of the diesel engine 10. The engine oil deterioration map is stored in advance in a storage unit (for example, ROM 22) of the control device 20.

As shown in FIG. 3, step S30 is executed after step S20. In step S30, the load of the diesel engine 10 mounted on the vehicle 1 is measured, and a map that defines the load frequency of the diesel engine 10 mounted on the vehicle 1 based on the measurement result (referred to as a load frequency map). ).

FIG. 4B is a diagram showing an example of a load frequency map created in step S30. The rows (200 to 4000) and columns (10 to 100) of the load frequency map shown in FIG. 4B have the same values as those of the engine oil deterioration map shown in FIG. 4A. That is, the row (200 to 4000) of the load frequency map shown in FIG. 4B indicates the rotational speed of the diesel engine 10, and the column (10 to 100) indicates the fuel injection amount of the diesel engine 10 per one rotation of the fuel injection pump. Yes.

Each value of A _1-1 to A _20-10 included in the load frequency map shown in FIG. 4B indicates the load frequency. This load frequency is an index indicating the degree of load generation per unit travel distance of the vehicle 1. In this embodiment, as an example of this load frequency, the load generation time (hr) per unit travel distance of the vehicle 1. / 10,000 km). That is, the unit of each numerical value of A _1-1 to A _20-10 is “hr / 10,000 km”. The “10,000 km” is merely an example of the unit travel distance, and the specific value of the unit travel distance is not limited to this. The control unit (CPU 21) of the control device 20 measures the load generation time when the actual vehicle 1 travels, and creates a load frequency map shown in FIG. 4B based on the measurement result. This load frequency map is stored in a storage unit (for example, RAM 23) of the control device 20, and the control unit (CPU 21) of the control device 20 is updated as needed according to the load measured as the vehicle 1 travels. You may comprise.

Note that the load frequency map shown in FIG. 4B shows that the time (occurrence time) when the rotational speed of the diesel engine 10 becomes 200 and the fuel injection amount becomes 10 when the vehicle travels 10,000 km is A _1-1 (hr) The time (occurrence time) when the rotational speed of the diesel engine 10 is 400 and the fuel injection amount becomes 20 is defined as A _2-2 (hr).

As shown in FIG. 3, the control part of the control apparatus 20 performs step S40 after step S30. In step S40, the control unit reads the engine oil deterioration map obtained in step S20 and the load frequency map obtained in step S30 with reference to the storage unit (ROM 22 and RAM 23), and reads the read engine oil deterioration map and the load. Based on the frequency map, the degree of deterioration of the engine oil considering the injection end timing of the main injection, the amount of smoke in the exhaust, and the load is estimated.

Specifically, the control unit calculates a total value of integrated values of each data of the engine oil deterioration map illustrated in FIG. 4A and each data of the load frequency map illustrated in FIG. 4B, and this total value is calculated as the main injection. The degree of engine oil deterioration taking into account the injection end timing, the amount of smoke in the exhaust, and the load. This can be explained with a specific example as follows.

For example, the control unit accumulates data in the same row and the same column for the engine oil deterioration map shown in FIG. 4A and the load frequency map shown in FIG. 4B. Specifically, the control unit _{adds up} a _1-1 of the engine oil deterioration map and A _{1-1 of the} load frequency map, and a control unit a _{1-2 of the} engine oil deterioration map and A _{1-2 of the} load frequency map Is accumulated. The control unit performs such integration for all data included in the engine oil deterioration map and the load frequency map, and calculates the total value (sum) of these integrated values. The control unit uses this total value as the engine oil deterioration degree (% / 10,000 km) in consideration of the injection end timing of the main injection, the smoke amount in the exhaust, and the load.

That is, the control unit calculates the deterioration level (D) of the engine oil in consideration of the injection end timing of the main injection, the smoke amount in the exhaust, and the load based on the following formula (1). The engine oil deterioration degree estimation method for the diesel engine 10 according to the present embodiment is executed by the above procedure.

According to the engine oil deterioration degree estimation method according to the present embodiment described above, the injection end timing of the main injection of the diesel engine 10, which is the three factors affecting the deterioration degree of the engine oil of the diesel engine 10, the diesel engine Since the engine oil deterioration degree can be estimated in consideration of all the smoke amount in the exhaust gas 10 and the load of the diesel engine 10, the engine oil deterioration degree can be estimated with high accuracy.

(Modification of the embodiment)
In addition, when the engine oil deterioration degree estimated in step S40 is equal to or greater than a predetermined value, the control unit of the control device 20 may execute a process of notifying the driver of the vehicle 1 to that effect. Specifically, the control unit is disposed, for example, in the driver's seat of the vehicle 1 when the engine oil deterioration degree estimated in step S40 is equal to or greater than a predetermined value stored in the storage unit of the control device 20 in advance. A notification device such as a display (not shown) displays that the engine oil deterioration level has reached a predetermined value or more. As a result, the driver can know that the degree of deterioration of the engine oil has exceeded a predetermined value, and as a result, the engine oil can be replaced at an appropriate time.

The preferred embodiments of the present disclosure have been described above. However, the present disclosure is not limited to the specific embodiments, and various modifications and changes can be made within the scope described in the claims.

This application is based on a Japanese patent application (Japanese Patent Application No. 2016-148398) filed on July 28, 2016, the contents of which are incorporated herein by reference.

The engine oil deterioration degree estimation method according to the present disclosure is useful in that it can accurately estimate the deterioration degree of diesel engine engine oil.

1 Vehicle 10 Diesel Engine 12 Intake Passage 13 Exhaust Passage 20 Control Device

Claims

A method for estimating the degree of deterioration of engine oil in a diesel engine,
Engine oil deterioration map that defines the degree of deterioration of the engine oil in consideration of the injection end timing of the main injection of the diesel engine and the influence of the smoke amount in the exhaust of the diesel engine in association with the load of the diesel engine The steps of creating
Creating a load frequency map that defines a load frequency indicating the degree of occurrence of the load per unit mileage of a vehicle equipped with the diesel engine;
Estimating the degree of deterioration of the engine oil in consideration of the injection end timing of the main injection, the smoke amount in the exhaust, and the load based on the engine oil deterioration map and the load frequency map; Engine oil deterioration degree estimation method for diesel engine including
The step of creating the engine oil deterioration map creates a first map that defines the relationship between the injection end timing of the main injection and the deterioration degree of the engine oil in association with the load of the diesel engine, and Create a second map that defines the relationship between the amount of smoke in the exhaust gas and the degree of deterioration of the engine oil in association with the load of the diesel engine, and based on the first map and the second map, For each load of the diesel engine, the deterioration degree of the engine oil is selected for each of the loads of the diesel engine in the factor having the larger influence on the deterioration degree of the engine oil among the injection end timing of the main injection and the smoke amount in the exhaust. The diesel engine engine of claim 1, comprising creating an engine oil deterioration map. N'oiru degradation degree estimation method.
The step of estimating the degree of deterioration of the engine oil calculates a total value of integrated values of each data of the engine oil deterioration map and the load frequency map, and uses the calculated total value as an injection end timing of the main injection. The engine oil deterioration degree estimation method for a diesel engine according to claim 1 or 2, further comprising setting the deterioration degree of the engine oil in consideration of the amount of smoke in the exhaust gas and the load.
A method for estimating the degree of deterioration of engine oil in a diesel engine,
Engine oil deterioration map that defines the degree of deterioration of the engine oil in consideration of the injection end timing of the main injection of the diesel engine and the influence of the smoke amount in the exhaust of the diesel engine in relation to the load of the diesel engine A step of referring to
Referring to a load frequency map defining a load frequency indicating the degree of occurrence of the load per unit mileage of a vehicle equipped with the diesel engine;
Estimating the degree of deterioration of the engine oil in consideration of the injection end timing of the main injection, the smoke amount in the exhaust, and the load based on the engine oil deterioration map and the load frequency map; Engine oil deterioration degree estimation method for diesel engine including
A control device for controlling the operation of a diesel engine,
A processor;
With memory,
In the memory, (1) the degree of deterioration of the engine oil considering the injection end timing of the main injection of the diesel engine and the amount of smoke in the exhaust of the diesel engine is used as the load of the diesel engine. An engine oil deterioration map defined in association with it, and (2) a load frequency map that defines a load frequency indicating a degree of occurrence of the load per unit mileage of a vehicle on which the diesel engine is mounted;
The processor operates to perform processing including:
Reading the engine oil deterioration map from the memory;
Reading the load frequency map from the memory;
The degree of deterioration of the engine oil is estimated based on the engine oil deterioration map and the load frequency map.