JPH0138250Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a deterioration warning device for determining the deterioration status of engine oil and oil filter based on driving conditions and notifying appropriate replacement timing.

<Conventional technology> Engine oil and oil filters deteriorate over time, and if these engine oils and oil filters deteriorate, abnormal engine wear and abnormal combustion will occur, which will have a negative impact on the engine. . For this reason, conventionally, the number of miles traveled has been used as a guideline for specifying when to replace engine oil and oil filters.

<Problems that the invention seeks to solve> However, the degree of deterioration of engine oil and oil filters varies greatly depending on driving conditions, such as driving frequency and loading conditions, and the conventional number of miles traveled that specifies the replacement period is Since the values are set with a sufficient degree of safety in mind, there are many cases where the product is replaced even though it is still in a usable condition, which is uneconomical. Incidentally, some oil filters are disclosed in Japanese Utility Model Application Publication No. 123603/1983.

Therefore, the present invention was developed in view of the above-mentioned circumstances, and aims to determine the degree of deterioration of the engine oil and oil filter based on the driving condition of the vehicle, thereby allowing them to be replaced at the optimal time. purpose.

<Means for solving the problem> For this reason, in the present invention, as shown in FIG. a smoke contamination amount calculation means for calculating the amount of smoke contamination in the oil filter, a detection means for detecting the oil passage state of the oil filter, and a smoke trap amount of the oil filter based on the oil passage state detection signal from the detection means. a smoke trap amount calculation means; an oil deterioration index calculation means for calculating an oil deterioration index based on the engine rotation speed, fuel injection amount, smoke contamination amount, and smoke trap amount;
An oil deterioration index accumulation means for accumulating the calculated oil deterioration index, an oil deterioration index accumulation value storage means for storing the oil degradation index accumulation value, and a smoke trap amount accumulation means for accumulating the calculated smoke trap amount. and a smoke trap amount integrated value storage means for storing the smoke trap amount integrated value;
Warning means that issue a warning when each integrated value stored in each of the storage means becomes larger than each predetermined set value, and storage in the corresponding storage means when the oil or oil filter is replaced. and integrated value reset means for resetting the integrated values that have been set.

<Operation> As a result, the amount of smoke mixed in is calculated by the smoke mixed amount calculation means based on the engine rotation speed and the fuel injection amount. Further, the smoke trap amount of the oil filter is calculated by the smoke trap amount calculation means based on the oil passing state of the oil filter. Furthermore, an oil deterioration index is calculated from the calculated smoke mixture amount, smoke trap amount, engine speed, and fuel injection amount using oil deterioration determination data stored in advance. Then, the oil deterioration index and oil trap amount calculated for each run are accumulated and stored in the respective accumulation storage means, and when each of these accumulation values becomes larger than the set value, a warning is issued and the oil or oil filter is replaced. Inform the driver that you are Furthermore, when the oil or oil filter is replaced, the integrated value is reset by the corresponding integrated value reset means.

<Example> Examples of the present invention will be described below.

FIG. 2 shows an embodiment of the hardware configuration of the present invention.

In the figure, 1 is an engine body, 2 is a fuel injection pump, 3 is an oil filter, and 4 is a transmission. In addition, a rotation speed sensor 6 serves as a rotation speed detection means for detecting the engine rotation speed, and a timer 5 receives the signal from the rotation speed sensor 6.
A time sensor 7 measures the time from start to stop of the engine, an injection amount sensor 8 serves as a fuel injection amount detection means for detecting the amount of fuel injection, and the state of oil passing through the oil filter 3, e.g. flow rate. A flow rate sensor 9 as an oil passage state detecting means for detecting the oil passing state and a distance sensor 10 for detecting the travel distance from the rotational speed of the transmission output shaft 4a are installed. Note that a differential pressure sensor that detects the differential pressure between upstream and downstream of the oil filter 3 may be used instead of the flow rate sensor 9.

The detection signals from these sensors 6 to 10 are sent to the CPU 11 through the sensor input interface 1.
2. In addition, reset signals from an oil reset switch 14 and a filter reset switch 15 are input to the CPU 11 via a switch input interface 13 when the engine oil or oil filter is replaced.

A ROM 16 stores various data maps necessary for calculating the degree of deterioration of the engine oil and oil filter. 17 is RAM,
For example, the engine oil deterioration index and the integrated value of the oil filter trap amount calculated by the CPU 11 at fixed time intervals are stored and held here.
18 and 19 are warning devices for engine oil and oil filter, and when each integrated value becomes larger than the corresponding set value, CPU1
1 is supplied via an output interface 20 to issue a warning and prompt the driver to change the engine oil or oil filter. Here, the CPU 11 includes a smoke mixing amount calculation means,
The RAM 17 corresponds to a smoke trap amount calculation means, an oil deterioration index calculation means, an oil deterioration index accumulation means, and a smoke trap amount accumulation means, and the RAM 17 corresponds to an integrated value storage means for the oil deterioration index and the smoke trap amount.

Next, the operation will be explained with reference to the flowchart shown in FIG.

First, in S1, it is determined whether or not the oil filter has been replaced based on the presence or absence of a reset signal from the filter reset switch 15, which is a means for resetting the smoke trap amount integrated value, and when the reset signal is output, it is determined as YES. RAM by running S2
The integrated value of the filter trap amount stored in 17 is reset, and the process proceeds to S3. If the reset signal is not output (NO), the process directly proceeds to S3. In S3, oil reset switch 1, which is a means for resetting the oil deterioration index integrated value, is activated in the same way.
It is determined whether or not the engine oil has been replaced based on the presence or absence of the reset signal from step 4. If YES, the integrated value of the oil deterioration index is reset in S4, and then the process proceeds to S5; if NO, the process directly proceeds to S5. next
By executing S5 to S9, the detection signals from each sensor 6 to 10 are input, and the engine rotation speed N, fuel injection amount Q, flow rate (or differential pressure) of the oil filter 3,
Enter travel time and distance data.

Next, in S10, engine speed N and fuel injection amount Q
Based on this, the smoke generation amount is read from the smoke generation map stored in the ROM 16 shown in FIG. Find the amount of smoke engine oil mixed in, K _S. In addition, in S12, the graph shown in FIG. 6 (stored in ROM 16) showing the relationship between oil filter flow rate (or differential pressure) and trap amount is used.
Find the trap amount _KF of the oil filter from S13
Then, this trap amount K _F is added to the trap amount cumulative value up to the previous time stored in the RAM 17 to calculate the trap amount cumulative value, and the trap amount cumulative value is stored in the RAM 17. Then, in S14, the travel distance (or time) until the oil filter replacement time is calculated from the graph in Figure 8 based on this trap amount integrated value, and this is displayed by executing S15. It is determined whether the integrated quantity value has exceeded a predetermined set value (limit point), that is, whether it is time to replace it. If it has exceeded it (YES), a warning is issued for the oil filter in response to the output from the CPU 11. The device 19 issues a warning to inform the driver that it is time to replace the oil filter. In addition, in S18, it is expressed as a function of the engine speed N, fuel injection amount Q, smoke oil mixing amount K _S and oil filter trap amount K _F (K = f (N,
Q, K _S , K _F ) Calculate the oil deterioration index from the graph in Figure 7. Next, the oil deterioration index is
Add it to the previous integrated value of the oil deterioration index stored in the RAM 17 and store it in the RAM 17, and calculate the mileage (or time) corresponding to the current integrated value of the oil deterioration index from the graph in Figure 9. Then, calculate the mileage (or time) until the oil change time (S19, S20). Then, while displaying this, it is determined whether the oil deterioration index integrated value exceeds a predetermined set value (limit value),
If it exceeds (YES), the engine oil warning device 18 issues a warning in response to the output from the CPU 11, prompting the driver to change the engine oil (S21 to S23).

In this way, the degree of deterioration of the engine oil and oil filter is constantly monitored based on driving data,
Since a warning is issued when the degree of deterioration exceeds a set value, it is possible to replace the product at an appropriate time, eliminating the waste of replacing the product even though it can still be used. In the embodiment described above, a device having a function of displaying the mileage (or time) until replacement time is shown, but it is also possible to simply issue a warning. A control flowchart in this case is shown in FIG.

Control flowchart of this embodiment (S31~
48) eliminates the need for the travel distance detection and integration process, and determines whether the integrated values of the trap amount and oil deterioration index, which were obtained in the same manner as in the previous embodiment, exceed the respective set values. (S43, S47), and if it is exceeded, a warning will be issued (S44, S48).

If the fuel injection amount, which is closely related to the engine load, is included as a determining factor for oil deterioration and oil filter deterioration, as in the deterioration warning device of this embodiment, the driving conditions such as driving frequency and loading conditions can be adjusted. This has the effect of allowing accurate deterioration determination even for different cargo vehicles, dump trucks, etc. In particular, in a diesel engine, oil deterioration is dominated by the smoke amount, so by including the fuel injection amount as a deterioration determination factor, accurate deterioration determination can be made.

<Effects of the invention> As described above, according to the invention, the timing for replacing the engine oil and oil filter is determined based on the driving conditions, and a warning is issued to notify the driver of the timing of replacement, thereby providing optimal results. It can be replaced at any time. Therefore, abnormal wear and combustion of the engine due to deterioration of the engine oil and oil filter can be prevented, the safety of the engine can be improved, and unnecessary replacement of the engine oil and oil filter can be eliminated.
In addition, since deterioration is determined by detecting the engine rotation speed and fuel injection amount related to engine load, accurate deterioration can be determined even in vehicles with different driving conditions such as cargo trucks and dump trucks, such as driving frequency and loading conditions. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining the configuration of the present invention, FIG. 2 is a diagram showing an embodiment of the hardware configuration of the present invention, FIG. 3 is a control flowchart of the same embodiment, and FIG. Figure 5 shows the relationship between engine speed, fuel injection amount, and amount of smoke generated. Figure 5 shows the relationship between the amount of smoke generated and the amount of smoke mixed into the oil. Figure 6 shows the relationship between oil filter flow rate (or differential pressure) and trap amount. Figure 7 is a diagram showing the relationship between oil deterioration index and running conditions, Figure 8 is a diagram showing the relationship between trap amount and traveling distance (or time), and Figure 9 is a diagram showing oil deterioration index and traveling distance (or time). ), and FIG. 10 is a control flowchart of another embodiment. 1...Engine body, 2...Fuel injection pump,
3...Oil filter, 5...Timer, 6...
Rotation speed sensor, 7...Time sensor, 8...Injection amount sensor, 9...Flow rate sensor, 10...Distance sensor, 11...CPU, 12...Input interface for sensor, 13...Input interface for switch Face, 14...Oil reset switch, 15...
...Filter reset switch, 16...ROM,
17... RAM, 18, 19... Warning device, 20
...Output interface.

Claims (1)

[Scope of utility model registration request] Engine rotation speed detection means, fuel injection amount detection means, smoke mixture amount calculation means for calculating the amount of smoke mixed into oil based on the detection signals from both detection means, and detection means for detecting the oil passage state of the oil filter. means, smoke trap amount calculation means for calculating the smoke trap amount of the oil filter based on the oil passage state detection signal from the detection means, engine rotation speed, fuel injection amount, smoke mixed amount, and smoke trap amount. an oil deterioration index calculation means for calculating an oil deterioration index based on the oil deterioration index, an oil deterioration index accumulation means for accumulating the calculated oil deterioration index, and an oil deterioration index integrated value storage means for storing the oil deterioration index integrated value; A smoke trap amount integrating means for integrating the calculated smoke trap amount, a smoke trap amount integrated value storage means for storing the smoke trap amount integrated value, and each integrated value stored in each of the storage means. each warning means that issues a warning when the value becomes larger than each predetermined set value, and each integrated value reset that resets the integrated value stored in the corresponding storage means when the oil or oil filter is replaced, respectively. A deterioration warning device for engine oil and an oil filter, characterized by comprising: means.