JPS61212621A - Engine-oil replacing timing warning apparatus - Google Patents

Abstract

PURPOSE:To alarm the replacement of engine oil at correct time by correcting the detected traveling distance by using the operation state quantity of an engine and the operation state of a supercharger, in consideration of the deterioration of oil. CONSTITUTION:A crack-angle sensor 20 detects the engine revolution speed and a water-temperature sensor 22 detects the temperature of the engine cooling water related to the engine-oil temperature. Further, a boost-pressure sensor 26 detects the engine supercharge pressure in an intake manifold 24 related to the number of revolution of a turbocharger 18, and an oil-temperature sensor 28 detects the engine-oil temperature at the bearing part. The correction coefficients KE and KJ on the engine side and the turbo-charger 18 side are obtained by sending the above-descrived detection signals into an warning control circuit 12, and the correction coefficient K is calculated by adding the above-described correction coefficients KE and Kr. Forrection is performed by multiplying the traveling distance of a car which is obtained from the detection signal of a car speed sensor 24 by the correction coefficient K, and when the integration value reaches a set value, a warning 10 comes ON.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an engine oil change time warning device that automatically detects the change time of engine oil based on its usage history and warns of oil change.

(Background of the Invention) In a conventional device of this type known from Japanese Patent Application Laid-Open No. 57-151447, the mileage is accumulated after being corrected according to the engine load and engine speed, and the accumulated value is set to a predetermined value. It was warning me to change the oil when it reached.

However, in vehicles equipped with turbocharged engines, the maximum engine speed is 600 O.
rpm, whereas the maximum rotation speed of the turbocharger reaches 150,000 to 20,000 Q rpm, and when the engine is stopped after high-load operation, the oil pump also stops and the turbocharger oil boils due to the heat of the turbine. (heat soak) As can be understood from this, the lubricated bearing section becomes extremely hot.

As a result, engine oil deteriorates more quickly, and in the past, when high-load operation was repeated, warnings for engine oil replacement were delayed, resulting in problems with engine and turbocharger lubrication. .

(Object of the invention) The present invention has been made in view of the above-mentioned conventional problems,
The purpose is to provide this type of device that can alert you to change engine oil at an accurate time, taking into account oil deterioration on the side of a supercharger such as a turbocharger.

(Configuration of the Invention) In order to achieve the above object, an apparatus according to the present invention is configured as shown in FIG.

In the figure, the traveling distance of the vehicle is detected by a traveling distance detecting means a, and the detected traveling distance is integrated by a traveling distance accumulating means.

When the cumulative mileage value reaches a set value, a warning means C warns that the engine oil must be replaced, and the engine oil is replaced in accordance with the warning.

Here, the operating state quantity of the engine is determined by the operating state quantity detection means d.
The operating state quantity of the supercharger provided in the engine is detected by the operating state quantity detection means e.

The driving state quantities and operating state quantities respectively detected by the detecting means d and e are given to the traveling distance correcting means f, and in this traveling distance correcting means f, the detected traveling distance obtained by the traveling distance detecting means a is given to the traveling distance correcting means f. It is corrected using the operating state quantity and the operating state quantity.

(Description of Embodiments) Hereinafter, preferred embodiments of the apparatus according to the present invention will be described based on the drawings.

A warning light 10 shown in FIG. 2 is turned on to warn that the engine oil needs to be replaced, and the warning light control circuit 12 controls the lighting.

The vehicle speed is detected by a vehicle speed sensor 14 to detect the distance traveled, and the vehicle speed detection signal is sent to the warning control circuit 1.
It is given to 2.

In this embodiment, the vehicle speed is detected from the rotational speed of the output shaft of the transmission 16, and the warning control circuit 12 performs an integral process on the detection signal to determine the distance traveled by the vehicle.

The travel distance is accumulated by the warning control circuit 12, and when the accumulated value reaches a set value, the warning light 10 is turned on.

Here, in order to correct the mileage, the operating state quantities of the engine and the operating state quantities of the turbocharger 18 are detected, and in this embodiment, the rotational speed and the temperature of the engine oil are also detected as the engine operating state quantities. The rotational speed of the turbocharger 18 and the temperature of the engine oil in the bearing are used as the operating state quantities of the turbocharger 18.

As the detection signal for the engine rotation speed, a detection signal from a crank angle sensor 20 having a built-in distributor is used.

Further, since the engine coolant ffa[ is correlated with the temperature of the engine oil, the detection signal of the water temperature sensor 22 that detects the temperature of the engine coolant is used as the engine oil temperature detection signal.

Furthermore, since the engine boost pressure is correlated with the rotation speed of the turbocharger 18, the detection signal obtained by the boost pressure sensor 26 that detects the engine boost pressure in the intake manifold 24 is used as the rotation speed detection signal of the turbocharger 18. It is used.

The temperature of the engine oil in the bearing portion of the turbocharger 18 is detected by the oil temperature sensor 28 (note that it is also possible to configure the device to detect the temperature of the bearing portion of the turbocharger 18).

The detection signals obtained by these sensors 20, 22, 26, and 28 are given to the warning control circuit 12, and the warning control circuit 12 uses the detected engine speed and engine oil temperature to calculate the engine side correction coefficient ( The correction coefficient (KT) on the turbocharger 18 side is determined from the rotational speed of the turbocharger 18 and the temperature of the engine oil in its bearing portion.

Then, by adding these coefficients (Kε, KT), the final mileage distance correction coefficient (K) is obtained, and the coefficient (K> is the distance traveled by the vehicle obtained from the detection signal of the vehicle speed sensor 14. The correction is performed by multiplying the distance.

Note that engine oil deterioration progresses even when the vehicle is not running, so in this embodiment, the warning control circuit 12 accumulates the elapsed time since the engine oil was replaced, and the accumulated time value is set as the set value. Warning light also when reaching 10
is lit.

When the warning light 10 is visually confirmed to be lit and the engine oil is replaced, the reset switch 30 is operated to clear the accumulated mileage and accumulated time up to that point.

Further, the operating position of the ignition switch 32 is monitored by the warning control circuit 12, and the operating state is determined from the operating position.

Furthermore, the detection signals of the vehicle speed sensor 14 and the crank angle sensor 20 are given to an engine control circuit 34 along with detection signals regarding other engine operating state quantities, and the engine control circuit 34 controls the engine fuel injection control signal and the ignition coil 36. The ignition timing control signal is obtained.

This embodiment has the above configuration, and its operation will be explained below.

This embodiment device is always supplied with power supply voltage regardless of the operating position of the ignition switch 32, and when the device of this embodiment is powered on at the time of shipment from the factory, a usage time accumulation flag is first set ( FIG. 3, step 100).

With this flag set, the process shown in FIG. 4 is started, and in this process, the elapsed time integrated value t is determined by integrating the minute time Δt (step 102).

The time integrated value t is treated as equivalent to the amount of deterioration of the engine oil, and is compared with a set time tC that corresponds to the limit value of the amount of deterioration of the engine oil (step 104).

At this time, if the time integrated value t has not reached the set time tCk, it is determined that the engine oil has not deteriorated to the usage limit, and the integration process is performed (step 102).
is repeated.

Thereafter, when the cumulative time t reaches the set time tc, a warning flag is set (step 106), and the warning light 1 is set.
0 will be lit to warn you to change the engine oil.

When the light is visually recognized, the engine oil is replaced, and at that time, the reset switch 30 is operated to read the cumulative time value and the cumulative mileage Y to the initial value (
In other words, it is reset to O).

As described above, in this embodiment, the engine oil deteriorates regardless of whether it is used or not, so a warning to replace the engine oil is given when the time integrated value reaches the set value.

This warning is issued first when the distance traveled by the vehicle is short, but when the distance traveled is long, the following warning based on the distance traveled by the vehicle is issued first.

When driving the vehicle, when it is confirmed that the ignition switch 32 has been operated to the accessory position (ACC>), an operation confirmation flag is set (step 110), and the warning light 10 is turned on to confirm that the ignition switch 32 is operating normally. Operation is confirmed.

Furthermore, the ignition switch 32 is in the ignition position (I
G), when the start position @ (ST) is operated and the start of engine operation is confirmed (step 112), the mileage accumulation flag is set (step 114L), thereby starting the process shown in FIG.

In the process shown in FIG. 5, first the vehicle speed sensor 14, the crank angle sensor 20. Water temperature sensor 22, boost pressure sensor 26
, the detection signals of the oil pressure sensor 28 are sequentially captured, and the engine rotation speed, engine oil temperature, and turbocharger 1
8 and the temperature of the engine oil at the bearing portion of the turbocharger 18 are obtained (step 116).

Then, ε is determined as a correction coefficient on the engine side from the engine rotation speed and the temperature of the engine oil, and a correction coefficient KT on the turbocharger 18 side is determined from the rotation speed of the turbocharger 18 and the temperature of the engine oil at its bearing. Stella 1118), and further those coefficients K
The final correction coefficient K is obtained by adding E and KT (step 120).

Then, a minute time Δ is added to the vehicle speed V detected by the vehicle speed sensor 14.
The distance ΔR traveled by the vehicle during that time is determined by multiplying by t (step 122), and the distance ΔR is multiplied by the correction coefficient K to perform correction (step 124).

Next, the corrected travel route my is integrated (step 12
6) Since the mileage cumulative value Y can be considered to correspond to the amount of deterioration of the engine oil, it is compared with a set value YC at which the engine oil is considered to have deteriorated to the point that it cannot be used (step 128).

At this time, if the accumulated mileage value Y has not reached the set value YC, it is stored and the mileage calculation flag is reset (step 130).

The above processing is repeated while the vehicle is running,
Therefore, the cumulative mileage value Y increases as the amount of deterioration of the engine oil increases as the vehicle travels.

Thereafter, when the cumulative mileage value Y reaches the set value Yc, a warning flag is set (Stellab 132), and the warning light 10 is turned on by the flag setting.

When the lighting is visually recognized, the engine oil is replaced, and at that time, by operating the reset switch 30, the mileage cumulative value Y is reset to the initial value (O) together with the aforementioned time integral value t. .

As mentioned above, when the cumulative mileage of the vehicle reaches a set value, a warning is given to change the engine oil, but the cumulative mileage Y, which corresponds to the amount of deterioration of the engine oil, includes not only the amount of oil deterioration on the engine side. Since the amount of deterioration on the turbocharger 18 side is also included, in this example,
It alerts you to change the engine oil at the exact time and never delays.

Therefore, there is no problem with the lubrication of the turbocharger 18 and the engine, and as a result, wear and tear on the engine and the turbocharger 18 is prevented.

Further, in this embodiment, the temperature of the engine oil is detected using the water temperature sensor 22, and the water temperature sensor 22 is shared by the warning control circuit 12 and the engine control circuit 34. There is no need to add a new sensor, so it is possible to reduce the cost of the device. Note that in the case of directly detecting the oil temperature, it is preferable to provide an oil temperature sensor in the oil panjar engine main gallery or the like.

Furthermore, since the boost pressure sensor 26 is generally provided in vehicles equipped with a turbocharged engine to display the boost pressure, the boost pressure sensor 26 can be used, and thereby the expensive Since a rotation speed detector is not required, it is possible to further reduce the cost of the device.

Incidentally, by examining the relationship between the temperature of the engine oil in the bearing portion of the turbocharger 18 and the supercharging pressure, an abnormality in the turbocharger v18 can be discovered.

That is, when oil slatch accumulates in the oil path to the turbocharger 18 and the flow resistance of the engine oil increases, the amount of oil supplied to the turbocharger 18 decreases and the temperature of the engine oil becomes abnormally high. When the boost pressure does not increase, it can be determined that the turbocharger 18 is operating abnormally.

In that case, it is also possible to use the warning light 10 shown in FIG. 2 to warn of the abnormality.

Although we have described the case of a turbocharger as a supercharger, it is not limited to turbochargers, such as mechanical superchargers (so-called superchargers) and other superchargers.
It can also be applied to (complex, etc.). In this case, since the rotational speed of the supercharger is often in a proportional relationship with the engine rotational speed, a more accurate rotational speed can be obtained than detection based on boost pressure.

(Effects of the Invention) As explained above, according to the present invention, the amount of deterioration of the engine oil on the supercharger side is reflected in the cumulative value of the mileage together with the amount of deterioration on the engine side. It becomes possible to warn about the replacement of
Therefore, regardless of the progress of engine oil deterioration on the turbocharger side, the warning for oil change will not be delayed (this will prevent the engine and turbocharger lubrication (disturbance) from occurring, and as a result, the engine and turbocharger It is possible to reliably prevent wear and tear.

[Brief explanation of drawings]

Fig. 1 is a diagram corresponding to claims, Fig. 2 is a configuration explanatory diagram showing a preferred embodiment of the device according to the present invention, Figs. 3, 4, and 5.
This figure is a flowchart diagram for explaining the operation of the embodiment of FIG. 3. a... Traveling distance detection means b... Mileage accumulating means C... Warning means d... Driving state quantity detection means e... Operating state quantity detection means f... Mileage distance correction Means 10...warning light 12...warning control circuit 14...vehicle speed sensor 18...turbocharger 20...crank angle sensor 22...water temperature sensor 26...boost pressure sensor 28... oil pressure sensor

Claims (1)

[Claims] (1) A mileage detecting means for detecting the mileage of the vehicle, a mileage accumulating means for accumulating the detected mileage, and a warning means for warning to change the engine oil when the accumulated mileage value reaches a set value. , an operating state quantity detection means for detecting an operating state quantity of the engine; an operating state quantity detection means for detecting an operating state quantity of a supercharger provided in the engine; An engine oil change time warning device comprising: a mileage correction means for correcting a detected mileage using the engine oil change time warning device.