JPS6220998A - Lublicating oil exchange warning device for vehicle - Google Patents

Abstract

PURPOSE:To give appropriate warning for lublicating oil exchange by detecting the temperature of the turbo bearing and correcting the integrated value or critical value of physical quantities, if the temperature is above a predetermined value, so as to reduce the time required to output a warning signal for lublicating oil exchange. CONSTITUTION:The oil temperature TT of the turbo bearing is detected, and when the oil temperature is below a predetermined oil temperature T1, the degradation weight coefficient KE on the engine side is selected, and when it is above T1 the degradation weight coefficient KE and a predetermined degradation weight coefficient KT on the turbo side are summed and the total K= KE+KT is selected. If, after the engine is stopped, the oil temperature of the turbo bearing becomes above a predetermined temperature T2 because of, so called, heat soaking, the elapsed time t to be selected is the total t=K1t1+K2t2 of K1.t1 obtained by multiplication of the time t1 when the oil temperature is above the predetermined temperature T1 by the degradation degree K1 and K2.t2 obtained by multiplication of the time t2 when the oil temperature is above the temperature T2 by the degradation degree K2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lubricating oil change warning device for a vehicle that accurately warns of lubricating oil change in a vehicle equipped with a turbocharger.

(Prior Art) Lubricating oil used to lubricate moving parts such as a vehicle's engine and transmission deteriorates over time and needs to be replaced.

Traditionally, for example, the instruction manual requires that the engine oil be changed every certain mileage or period of time, and a label is posted in an easy-to-see place, but it is easy to forget to change the engine oil. be. If lubricating oil is used beyond the allowable deterioration level, it will impede the lubrication effect, so it is important to warn when it is time to replace it. It is not determined solely by this, but is also greatly influenced by vehicle usage conditions such as road conditions, so it is not appropriate to issue a warning based solely on mileage or period.

Therefore, in Japanese Patent Application Laid-Open No. 59-43299, the physical quantities of driving that affect the degree of deterioration of lubricating oil, such as the temperature of lubricating oil in a vehicle and the rotational speed of the engine, are detected moment by moment, and based on these detection results, a weighting factor for deterioration is calculated. A warning device has been proposed that determines the mileage, corrects the mileage based on this weighting factor, integrates this correction value, and issues a warning to change the lubricating oil when the integrated value reaches the allowable deterioration limit. There is.

On the other hand, since lubricating oil deteriorates over time regardless of vehicle operating conditions, the elapsed usage time of lubricating oil is accumulated, and a warning to change the lubricating oil is also issued when the accumulated value reaches an allowable limit value. It is preferable to do this, and in this way, a warning to change the lubricating oil will be issued based on the driving history for a vehicle with a high mileage, and based on the elapsed usage time of the lubricant for a vehicle with a low mileage. It turns out. When the lubricating oil is replaced, the warning calculation result is cleared and the system returns to its original state.

By the way, vehicles equipped with superchargers called turbochargers have recently become popular, using exhaust gas from the engine to rotate a turbine, compressing air, and supplying the compressed air to the combustion chamber. However, the turbine wheel of this turbocharger may rotate at a high speed of 150.1) OOrp■, and the temperature of its bearings is about 15 degrees Celsius higher than the engine oil temperature while running, and even more so at high speeds and high loads. If you stop the engine immediately after driving for one mile, the circulation of lubricating oil stops, causing the oil temperature in the bearing to rise to over 250 degrees Celsius, a phenomenon called heat soak. In vehicles equipped with such turbochargers, the lubricating oil is oxidized and deteriorates quickly.

In vehicles that currently use the same oil in the oil pan to lubricate both the engine and turbocharger,
The above-mentioned conventional warning device, which calculates the degree of oil deterioration only based on the degree of oil deterioration on the engine body side, has a problem in that it cannot accurately warn when it is time to replace the oil because it does not take into account oil deterioration caused by the turbocharger. .

(Objects and Structure of the Invention) The present invention has been made in view of the above points, and focuses on the fact that in vehicles equipped with a turbocharger, the lubricating oil temperature in the turbo bearing is higher than the lubricating oil temperature in the engine body. The purpose is to issue oil change warnings accurately, and to achieve this purpose, as shown in Figure 1, sensors are used to detect predetermined physical quantities that change depending on the vehicle's driving conditions. Physical quantities are added in an arithmetic circuit based on a predetermined arithmetic formula, and then integrated over time, and when this integrated value exceeds a predetermined limit value, a warning signal for lubricating oil change is output and a warning is issued by a warning means. In addition to configuring
The temperature of the turbo bearing is detected by a temperature sensor, and when the temperature exceeds the set temperature, the integrated value or limit value of the physical quantity is corrected to shorten the time until a warning signal for lubricating oil change is output. Configured.

(Example) The present invention will be explained below based on the drawings.

FIG. 2 schematically shows an embodiment of a lubricating oil change warning device for a vehicle according to the present invention.

In this example, the engine rotation speed, vehicle speed, and engine oil temperature are used as physical quantities that change depending on the driving state of the vehicle, and the temperature of the lubricating oil in the turbo bearing (oil temperature) is used as the temperature of the turbo bearing. is used.

In the figure, ■ is a rotational speed sensor S1. which detects the engine rotational speed N. Sensors 2 consist of a vehicle speed sensor S that detects the vehicle speed ■ and an engine oil temperature sensor S3 that detects the oil temperature T in the engine body. The integrated value is corrected in consideration of oil deterioration in the turbocharger using data from the turbo bearing temperature sensor 6 that detects the oil temperature T in the bearing of the charger, and when the calculated value reaches a predetermined value. 3 is an ignition switch, 4 is a reset switch, and 5 is a warning lamp that issues an oil change warning signal. Note that since there is a certain relationship between the temperature of engine oil and the temperature of engine cooling water, the temperature of engine cooling water may be detected instead of the oil temperature of the engine body.

In the case of a vehicle in which fuel injection is controlled electronically, it is necessary to detect the engine cooling water temperature with the electronically controlled fuel injection device, so the water temperature sensor provided for this purpose can also be used. .

It is preferable that the sensors 1 are composed of sensors that output digital signals for processing in the arithmetic circuit 2. In this way, an expensive A-D converter is not required. For example, bimetal can be used as the oil temperature sensor S3 and the temperature sensor 6.

FIG. 3 is a flowchart illustrating the lubricating oil change warning operation of one embodiment of the lubricating oil change warning device according to the present invention.

Initialize variables Y and T to O at factory shipment (F-1
), the driver turns the ignition key A when getting into the car.
When you turn the ignition key to the CC (accessory) position, the operation of the warning lamp 5 is confirmed (F-2), and then turn the ignition key to the 5
Turn it to the TART (start) position to start the engine. During driving, engine speed sensor S, car a sensor 3. The output from the z7 engine oil temperature sensor S3 and the output from the turbo bearing temperature sensor 6 are read (F-3), and the weighting coefficient K of oil deterioration is calculated in the calculation circuit 2 as follows. That is, as shown in Fig. 4, the oil temperature TT of the turbo bearing is detected, and when the oil temperature is lower than a preset temperature T1, the deterioration weighting coefficient K on the engine side is determined.
E is adopted, but when it is higher than T1, the engine side deterioration weighting coefficient K is predetermined and the turbo side deterioration weighting coefficient is set to 7.
Add up and use = K +.

On the other hand, after the engine is stopped, the oil temperature in the turbo bearing reaches a preset temperature T (T2) due to the so-called heat soak phenomenon.
T1), the appropriate time t is the time t during which the oil temperature exceeds the set temperature T1 multiplied by the degree of deterioration K, which is 1 t1, and the time t2 during which the oil temperature exceeds the temperature T. 2t is adopted as the value t=, which is the sum of the value K 2 t 2 obtained by multiplying K by the degree of deterioration, and 2t for tl+.

If the engine is stopped and left in an idling state, the oil temperature in the turbo bearing may fall between T and T2, so while it is in this temperature range, the degree of deterioration will be greater than the set temperature T1. Alternatively, a new temperature T3 may be set between the set temperature T2 and T2, and the degree of deterioration corresponding to this may be determined.

Returning to Fig. 3 again, as mentioned above, the mileage y is corrected using the oil deterioration weighting coefficient K corrected based on the oil temperature TT of the turbo bearing (F-5), and then the driving history is calculated by integrating it. Calculate Y (F-6'l. When the driving history cumulative value Y thus calculated exceeds the limit value Yc (F-6'l)
7) Arithmetic circuit? outputs an oil change warning signal and lights up the warning lamp 5 (F-15).

Similarly, when accumulating the elapsed time after initial settings,
First, determine whether the ignition is on or not (F-8). If it is on, it is determined that the vehicle is running and simply adds up the elapsed time (F-9), but if it is not on, it is determined that the engine has stopped. The temperature T of the turbo bearing is the set temperature T.
It is determined whether or not it exceeds 1 (F-10). If the result is that T > T1, the process proceeds to step (F-9) and simply adds up the elapsed time. However, if TT > T1, Compared to the higher set temperature T2 (F-11),
If the turbo bearing temperature T is less than T2, then the original elapsed time t and the value obtained by multiplying this elapsed time t by 1 and the degree of deterioration are integrated. Judging the original elapsed time t and this elapsed time t
and the value obtained by multiplying the degree of deterioration by 2 (F
-13), When the cumulative value t of the elapsed usage time accumulated in this way exceeds the limit value tc (F-14), an oil change warning signal is output from the calculation circuit 2 and the warning balance 5 is lit (F-15). ), memorize whether the integrated value Y is larger or smaller than the limit value Yc (F-16), and then when the driver turns the ignition key to 0FF81, check to see if there is an oil change warning (F-16). 17), If a warning has been issued, the driver should change the oil (F-18), and then reset the driving history settlement value Y and the cumulative value t of the elapsed usage time (F-19).

If the oil change warning is not issued (F-18), return to step (F-2) and repeat the steps described above.

Note that in the above embodiment, the cumulative value of elapsed time is corrected when a heat soak phenomenon occurs, but the present invention is not limited to this, and the cumulative value Y of travel distance can be corrected by changing the deterioration weighting coefficient. Of course, it is also possible to do so.

Furthermore, although the oil temperature is used as the temperature of the turbo bearing, the temperature of the bearing may be directly detected using a bimetal or the like that comes into contact with the bearing.

(Effects of the Invention) As explained above, the present invention detects the temperature of the turbo bearing, and when the temperature exceeds the set temperature, corrects the integrated value or limit value of the physical quantity and warns the user to change the lubricating oil. Since it is configured to shorten the time until the signal is output, it can provide an accurate lubricant change warning even when the same lubricant is used to lubricate the engine body and turbo bearing in a vehicle equipped with a turbocharger. can do.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of a vehicle lubricating oil change warning device δ according to the present invention, FIG. 2 is a schematic diagram of an embodiment of the lubricating oil change warning device according to the present invention, and FIG. 3 is a lubricating oil change warning device according to the present invention. FIG. 4, a flowchart of the replacement warning operation, is a diagram showing the relationship between the oil temperature change in the turbo bearing and the lubricating oil deterioration weighting coefficient. 1... Sensors, 2... Arithmetic circuit, 3... Q ignition switch, 4... Reset switch, 5-...
・Warning lamp, 6...Turbo bearing temperature sensor, S
611・Sensing the number of engine circuits, S 0.・Vehicle speed sensor, 3 11 @ ii Engine oil temperature sensor Patent applicant: Nissan Motor Co., Ltd. Patent attorney: Hiroshi Suzuki Figure 1: $2: μ Housing: Tin ζ

Claims (1)

[Claims] A predetermined physical quantity that changes depending on the driving condition of a vehicle equipped with a turbocharger is detected, the physical quantity is added up based on a predetermined calculation formula, and then integrated over time, and when the integrated value exceeds a predetermined limit value. In a lubricating oil change warning device for a vehicle that warns when lubricating oil needs to be changed, a temperature sensor detects the temperature of a turbo bearing, and when the temperature of the turbo bearing detected by the temperature sensor exceeds a predetermined temperature, the physical quantity is detected. A lubricating oil change warning device for a vehicle, comprising: a correction means for correcting an integrated value or a limit value of so as to shorten the period until a lubricant change warning is issued.