JPS58144617A - Oil cooling system for internal-combustion engine for vehicle - Google Patents

Abstract

PURPOSE:To control the temperature of lubricating oil properly and safely by an arrangement wherein the lubricating oil flowing through an oil cooler is mixed with that which does not pass through the oil cooler through a controlling valve, and the quantity of the lubricating oil which does not pass through the oil cooler is reduced to zero at the time of malfunction of a control valve associated therewith. CONSTITUTION:The lubricating oil discharged by a lubricating oil pump 4 flows through a discharge flow path 11 of an oil cooler 1 and a by-pass flow path 8, and then the divided flow streams are mixed in a predetermined ratio in a control valve leading to an oil filter 2. The control valve 12 comprises a spool 14 having lands 15 and 16, and a spring 17 adapted to exert a thrust on the spool 14. The arrangement is made such that when an actuator 13 gets out of order and can not apply an actuating force to the spool 14 the spring 17 serves to block an outlet port 18 of the bypass flow path 8. Further, a signal generated by an oil temperature detector 10 and a signal generated by an engine cooling water temperature detector 9 are transmitted to a computor 23 which is connected with the actuator 13 to control the degree of opening of the control valve 12 whereby keeping the temperature of the lubricating oil in a main oil gallery 3.

Description

[Detailed Description of the Invention] An oil cooler installed on the lubrication system of a vehicle internal combustion engine is designed to suppress the rise in oil temperature within limits even under severe outside temperature and operating conditions. given the capacity to do so. This is natural from the perspective of preventing seizing accidents, but driving conditions where both the outside temperature and operating conditions are harsh do not occur continuously, and the capacity of the oil cooler Due to the fact that
In most cases, the temperature remains within the range of 80°C.

The above oil temperature is not preferable in terms of fuel consumption rate, and the friction loss at various parts is greater than when the oil temperature is in the range of 90°C to 110°C, resulting in a worse fuel consumption rate.

In view of the above-mentioned circumstances, the present invention intends to automatically control the oil temperature of the oil cooling system, and furthermore, in automatic control, even if a failure occurs in the automatic control part, it is possible to maintain a safe system. The present invention will be explained with reference to the drawings as follows.

In FIG. 1, (1) is an oil cooler, (2) is an oil filter, and (3) is a main oil gallery.

The oil that has reached the main oil gallery (3) via the oil pump (4), oil cooler (1), and oil filter (2) returns to the oil tank after passing through bearings f51 +61 +71, etc.

In the present invention, oil is divided into oil that flows through the oil cooler (11) and oil that flows without passing through the oil cooler (1), and as described below, these are mixed to control the oil temperature. The control factors are oil temperature and engine cooling water temperature.

(8) is a bypass passage through which oil flows without passing through the oil cooler (1), (9) is a detector for detecting the engine cooling water temperature, and αQ is a temperature detector for the mixed oil.

The control valve for performing the above control may be provided on the upstream side of the bypass flow path (8), but in the illustrated case, it is provided on the downstream side of the bypass flow path. The following explanation is for a case where the control valve O2 is provided on the downstream side of the bypass flow path (8).

The oil that has passed through the discharge flow path 0υ of the oil cooler (1) and the oil that has passed through the bypass flow path (8) are separated by a ratio determined by the oil temperature and engine cooling water temperature at the control valve az, using the oil temperature and engine cooling water temperature as signals. The oil filter (mixed below)
This leads to 2). αJ is an actuating device that moves the valve body of control valve α2.

The structure of control valve α and of its actuating device Q3+ is shown in FIG. In this figure, αa is the land portion α51 a
6+ is the spool (valve body), α9 is the spring that exerts thrust on it. The spring α force causes the outflow port αe of the bypass flow path (8) to be closed or nearly closed when the operating device α3 fails and no operating force is applied to the spool 0a. This state is similar to that of the conventional one in which the bypass flow path (8) and the control valve α2 are not provided, and the outflow port Q9 of the discharge flow path 01) of the oil cooler (1) is fully open or close to fully open. It is in.

The actuating device 03 that moves the spool circle is electromagnetically operated, and includes a rod ■ connected to the spool circle and an iron piece + 21 on the rod cutter.
It consists of a wire that exerts an attractive force on the wire (1) and a variable current transformer (2) that is controlled by a computer and changes the magnitude of the current passing through the wire (2). Note that □□□ is a power supply.

A signal from the oil temperature detector α and a signal from the engine cooling water temperature sensor (9) are sent to the computer, and the opening degree of control valve 0 is determined by the main oil gallery (3).
) The oil temperature can be optimized.

In the oil cooling system according to the present invention described above, all or most of the oil is flowed through the bypass passage (8) until the oil temperature reaches a value of 70°C to 80°C. . This provides advantageous conditions in that the oil temperature can be raised quickly and that oil is not sent to an oil cooler with high resistance at unnecessary times. Main oil gallery (
After the oil temperature in step 3) reaches the above temperature, the opening degree set in the computer (c) as a function of the engine cooling water temperature T1 and the oil temperature T2 in the main oil gallery (3). is continuously applied to the control valve α2 while the oil temperature is at an appropriate value (for example, 9
0°C-110°C). Note that the temperature T1.
The functional relationship between 72 is determined experimentally.

Although the oil cooling system according to the present invention is capable of providing a considerably higher oil temperature than conventional oil cooling systems, it is unlikely that the system will fall to a safe state when a failure occurs in the control device. As pointed out.

[Brief explanation of the drawing]

FIG. 1 is a drawing illustrating an oil cooling system according to the present invention, and FIG. 2 is a drawing showing the structure of a control valve of the cooling system of FIG. (1)...Oil cooler (2)...Oil filter (3)...Main oil gallery (4)...
Oil pump +51161 (7)...Bearing (8)
... Bypass flow path (9) ... Engine cooling water temperature detector αC ... Oil temperature detector αD ... Oil discharge flow path of oil cooler @ ... Control valve 0th stage ... Actuation device αt...Spool Q51 ce...Land part Q7+...Spring αt...Outflow port of bypass flow path 0t...Outflow port of oil cooler discharge flow path
・・Rod Q・・Iron piece ■・Wire ■・・Computer ・・Variable current transformer Rigid・・Power supply

Claims (1)

[Claims] A control valve is provided to mix the amount of oil flowing through the oil cooler with the amount of oil flowing not through the oil cooler, and the temperature of the mixed oil and the temperature of the engine cooling water are controlled factors. The control valve is controlled by the control valve, and the actuating device of the control valve is of an electromagnetic type, and when the actuating device loses operating power, the amount of oil flowing without going through the oil cooler is reduced to 0 or 0. An oil cooling system for a vehicle internal combustion engine, characterized in that the automatic valve is provided with a state close to that of the oil cooling system for a vehicle internal combustion engine.