JPH0893431A - Lubrication oil supply device of engine - Google Patents

Abstract

PURPOSE: To surely supply a specified oil supply quantity even if engine speed is varied during supply of the oil. CONSTITUTION: An engine lubricating oil supply device 12 is constituted for being provided with a direct oil supply type supply pump 16 driven by an engine 1 through a transmission mechanism 15 and for intermittently supplying the lubricating oil from the supply pump 16 to respective parts to be lubricated. In this case, the engine lubricating oil supply device 12 is provided with a consumption quantity calculation means 14a for estimatingly calculating a monetary lubrication oil consumption quantity a t the respective parts to be lubricated based on engine rotational speed (a) and a load (b), an integrating means 14b for integrating a momentary unit consumption quantity calculated by the calculation means 14a, an oil supply control means 14b by which lubrication oil is supplied from the time when integrated consumption quantity by the integrated means 14b reaches the oil feeding quantity per one time from a supply pump 16 to the time when the number of specified engine rotations reaches its specified value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil supply apparatus for an engine having a supply pump driven by the engine through a speed reduction mechanism.

[0002]

2. Description of the Related Art For example, in a two-cycle engine, in order to reduce white smoke, HC, particulates, and consumption of lubricating oil, lubricating oil is directly applied to a lubricated portion such as a piston sliding surface and a crank journal portion. In addition, a lubricating oil supply device that intermittently supplies and injects may be adopted.

Conventionally, as this type of lubricating oil supply device, an electromagnetic oil pump for intermittently feeding oil or a motor-driven oil pump has been adopted, and a three-dimensional map of engine speed-load-lubricant consumption is used. There is a system in which the lubricating oil unit consumption per engine revolution is integrated and the lubricating oil is supplied when the integrated value reaches the discharge amount per one time of the oil pump (Japanese Patent Application No. 4- 196607). By the way, in the above-mentioned electromagnetic and motor-driven oil pump supply method, if some trouble occurs in the electric system, there is a possibility that lubricating oil cannot be supplied to the engine, and there is a problem that fail-safe cannot be supported.

On the other hand, when the mechanical system in which the engine drives the oil pump through the speed reducing mechanism is adopted, it is possible to cope with fail-safe when an electrical system trouble occurs. This system is provided with an oil supply system that switches the lubricating oil discharged from the oil pump to either the engine side or the oil tank side by a three-way control valve, for example, an electromagnetic solenoid valve, and sends the oil. In general, duty control is performed to switch the three-way valve to the engine side during the oil feeding time set according to the engine speed, throttle opening, etc.

[0005]

However, in the above-described conventional control by oil feeding time, when the engine speed changes during oil feeding, for example, during transient operation, the number of discharges from the oil pump also changes. Therefore, even if the oil delivery time is the same,
For example, if the engine speed increases, the oil supply amount becomes excessive, and if the engine speed decreases, the oil supply amount becomes insufficient, and it is feared that the desired oil supply amount cannot be obtained.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a lubricating oil supply device for an engine that can supply the lubricating oil as a target even when the engine speed changes during oil feeding. There is.

[0007]

According to a first aspect of the present invention, there is provided a supply pump driven by an engine through a speed reducing mechanism,
A lubricating oil supply device for an engine, comprising an oil supply system for intermittently supplying the lubricating oil from the supply pump to each lubricated portion of the engine, in which the moment in the lubricated portion is changed from the engine speed and load. A consumption amount calculating means for estimating and calculating the lubricating oil consumption amount, an integrating means for integrating the unit unit consumptions every moment calculated by the calculating means, and an integrated consumption amount by the integrating means for each time from the supply pump. It is characterized by further comprising oil supply control means for controlling the oil supply system to a lubricating oil supply state from the time when the amount of oil supply is reached to the time when a predetermined number of engine revolutions is reached.

According to a second aspect of the present invention, the supply pump is an oil supply amount variable type in which the oil supply amount per time is variable, and the oil supply amount of the supply pump is changed according to the operating state of the engine. It is characterized in that it has an oil feed amount variable control means for variably controlling.

[0009]

According to the lubricating oil supply device of the first aspect of the present invention, the lubricating oil consumption amount that changes every moment is calculated and integrated, and the integrated amount is the amount of oil sent from the supply pump per time. At that time, the lubricating system is kept in the lubricating oil supply state until the predetermined engine speed is reached.
Even if the engine speed changes during the oil supply, the oil is reliably sent, and it is possible to supply the lubricating oil according to the target without excess or deficiency.

According to the second aspect of the present invention, since the amount of oil to be sent per one time is variable, the oil sending interval can be properly set while ensuring the maximum amount of oil to be sent. The lubricating oil consumption can be further reduced by reducing the amount of oil fed.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3 are views for explaining a lubricating oil supply device for an engine according to an embodiment of the invention of claim 1, FIG. 1 is a schematic configuration diagram of the device of this embodiment, and FIG. 2 is the device of the above embodiment. Is a schematic diagram and FIG. 3 is a flowchart diagram. In this embodiment, a case where the invention is applied to a lubricating oil supply device for a two-cycle diesel engine will be described as an example.

In FIG. 1, reference numeral 1 is a three-cylinder two-cycle diesel engine, which has a crankcase 2, a cylinder block 3, and a cylinder head 4 which are stacked and fastened to each other, and a piston 5 arranged in the cylinder block 3. Is connected to a crankshaft 7 arranged in the crankcase 2 by a connecting rod 6, and a fuel injection valve 8 is connected to the cylinder head 4.
It has a structure in which is provided. A transmission 10 is connected to one end of the crankshaft 7 via a clutch 9 and a feed pump 16 is connected to the other end via a reduction mechanism 15.
Are connected. The supply pump 16 may be of a plunger type or a rotary type.
Reference numeral 11 denotes a rotation speed sensor that detects the engine rotation speed.

The engine 1 is provided with a lubricating oil supply device 12, and the supplying device 12 includes a lubricating oil supply system 13
And a CPU 14. The lubricating oil supply system 13
An introduction passage 20 is connected to the suction port of the supply pump 16 and the introduction passage 20 is connected to a lubricating oil tank 22 with an oil filter 21 interposed.

Further, six discharge passages 23, ... Are connected to the discharge ports of the supply pump 16 and each of the discharge passages 2
An electromagnetic solenoid valve 25 is connected to 3 via a strainer 24. Each solenoid valve 2
5, a return passage 26 that communicates the discharge passage 23 with the lubricating oil tank 22, and first and second supply passages 27 that communicate the discharge passage 23 with each lubricated portion of the engine 1.
28 are connected, the first supply passage 27 is connected to the three journal bearing portions of the crankshaft 7, and the second supply passage 28 is connected to the three piston sliding surfaces. Part of the lubricating oil supplied to the journal bearing portion is guided to the large end of the connecting rod 6 through the crankshaft 7, and part of the lubricating oil supplied to the piston sliding surface is atomized. And is guided to the small end of the connecting rod 6. The check valve 2 for blocking the flow to the solenoid valve 25 side is provided in the return passage 26 and the supply passages 27, 28.
9a to 29c are provided.

The solenoid valve 25 connects the discharge passage 23 and the return passage 26 when energized, and connects the discharge passage 23 and the supply passages 27 and 28 when shut off. This ensures the supply of lubricating oil to the engine side when some trouble occurs in the electric system.

Here, the amount of oil sent by the supply pump 16 per operation is fixed to Pq, and this _Pq is set to the minimum value within the range where the maximum condition of the amount of lubricating oil supplied can be satisfied. This makes it possible to supply the lubricating oil with a short oil supply interval while minimizing the amount of oil sent.

The CPU 14 uses the consumption amount calculating means 14
a, integrating means 14b, and refueling control means 14c. Based on the engine speed signal a from the speed sensor 11 and the load signal b from an accelerator opening sensor (not shown), the consumption amount calculating means 14a per engine revolution on the crank journal side in the operating state. The required lubricating oil amount (unit required amount) q and the required lubricating oil amount (unit required amount) r per engine revolution on the piston sliding surface side are estimated and calculated. The load signal b is the fuel injection amount from the fuel injection valve, the intake air amount,
Alternatively, it can be obtained from the throttle valve opening and the like.

Here, the above-mentioned unit demands q and r are calculated by, for example, individually incorporating a three-dimensional map of engine speed-load-lubricant demand for the crank journal side and the piston sliding surface side. The search is performed by searching each of these maps or by using respective preset arithmetic expressions. In this case, the unit request amounts q and r are set so that the higher the load and the higher the rotation, the larger the unit request amounts q and r. Also, the ratio s of r / q
Is set so that s in the high load range is greater than or equal to s in the low load range.

Further, the integrating means 14b integrates the calculated unit request quantities q and r every moment, and the integrated request quantity Q (=
Σq) and R (= Σr) are obtained. Then, the oil supply control means 14c outputs an OFF signal to each solenoid valve 25 at the time when the accumulated lubricating oil consumption amounts Q and R reach the oil supply amount per one time of the supply pump 16, and at the same time, the engine. The number of rotations is counted, and the off signal is maintained until the number of rotations reaches a predetermined value. For example, when the speed reduction ratio of the speed reduction mechanism 15 is 40: 1, the OFF signal is maintained from the time when the OFF signal is output until the number of engine revolutions reaches 40, during which the solenoid valve 25 is in the lubricating oil supply state. Held in. Here, the number of rotations of the supply pump 16 may be counted instead of the number of engine rotations, and the off signal may be maintained until the number of counts becomes 1.

Next, the operation of the apparatus of this embodiment will be described with reference to the flowchart of FIG. When the ignition key is turned on, the CPU 1
In step 4, Σq (the required amount of lubricating oil) and M (the number of engine revolutions) are initialized to zero, and then each solenoid valve 25 is turned on (closed) (steps S1 and S2).

When the engine is started, the rotation speed signal a from the engine rotation speed sensor 11 and the load signal b from the throttle sensor are input, and the rotation speed and load of the engine are obtained from these input signals (step S3). ~
S5).

Next, by searching the three-dimensional map, the required amount of lubricating oil per engine revolution according to the engine speed on the crank journal side and the piston sliding surface side-load (unit required amount q _Nn (n = 1, 2, 1 , 3, ...) are calculated, and the required amount is integrated for each revolution of the engine, and thus the required amount that changes momentarily according to the operating state of the engine is calculated and integrated (step S6). ~ S8).

Next, in step S9, the integrated request amount Q (= Σq _Nn ) obtained by integrating the unit request amount q _Nn is compared with the per-oil delivery amount Pq of the supply pump 16, and the integrated request amount Q is delivered. If the amount Pq is not reached, the process returns to step S4.
When the integrated required amount Q reaches or exceeds Pq, the determination in step S9 becomes Yes, the process proceeds to step S10, and an off signal is output to the solenoid valve 25, which causes the solenoid valve 25 to supply the supply passage 27, Switching to the 28 side, the lubricating oil from the supply pump 16 is supplied to each crank journal portion and piston sliding surface.

Then, the number of engine revolutions M from the time when the off signal is output is integrated (step S1).
1), in step S12, the engine rotation number M and
The supply pump 16 is compared with a preset engine rotation number X corresponding to one discharge of the lubricating oil, and if the rotation number M does not reach the set rotation number X, step S
Return to 4. When the number of rotations M reaches or exceeds the set number of rotations X, an ON signal is output to the solenoid valve 25, whereby the solenoid valve 25 is switched to the return passage 26 side, and the lubricating oil from the supply pump 16 is removed. Return to the lubrication tank 22. Here, supply pump 1
In the case where 6 is a type that discharges once per rotation, if the reduction ratio of the reduction mechanism is 1 / G, the set rotation number X is G ± α.
(Α is a correction value, G> α).

Next, in step S14, the engine rotation number M is reset to zero, and in step S15, the sum of the required amount Q (Σq _Nn ) and the oil feed amount Pq are subtracted by Σ.
It is set to q _{(N +1) 0} (a carry-over request amount to the next time). Then the program returns to step S4.

As described above, according to the present embodiment, the required amount q that changes momentarily according to the operating state of the engine is calculated and integrated, and the integrated value Q is the oil feed per time of the supply pump 16. Since the number of engine revolutions is counted from the time when the amount Pq is reached and the solenoid valve 25 is kept in the oil supply state until the number of revolutions reaches the set value, even if the engine revolution number changes during oil supply. The amount of oil to be sent can be secured as desired, and an appropriate amount of lubricating oil can be supplied without excess or deficiency. As a result, the target lubricating oil can be supplied in all operating states including the transition period, and the white smoke and the lubricating oil consumption can be reduced.

In this embodiment, the supply pump 16 driven by the engine 1 to reduce the speed is adopted, and the lubricating oil from the pump 16 is supplied to the engine side when the solenoid valve 25 is turned off. Even if some kind of trouble occurs, the supply of lubricating oil to the engine side can be secured, and it is possible to deal with fail-safe.

4 to 6 are views for explaining a lubricating oil supply apparatus for an engine according to an embodiment of the invention of claim 2, FIG. 4 is a schematic view of the apparatus of this embodiment, and FIG. 5 is a flow chart. FIG. 6 is a diagram showing a variable characteristic of the oil feed amount. The schematic configuration of this embodiment is basically the same as that of the above embodiment, and detailed description thereof will be omitted.

In the apparatus of this embodiment, the supply pump 16 is provided with an actuator 30 for switching the amount of oil sent from the pump 16 per one of two steps, max and min. In the case of a plunger type pump, the stroke of the plunger is switched between large and small.

Then, the CPU 14 of this embodiment has the above-mentioned consumption amount calculating means 14a, integrating means 14b, refueling control means 1
Together with 4c, it also functions as an oil feed amount variable control means.
The oil feed amount variable control means outputs a switching signal of either max or min to the actuator 30 in accordance with the required lubricating oil amount obtained based on the engine speed signal a and the load signal b. For example, in the low speed / low load operation range, the min side signal that makes the oil feed amount min is output, and in the high speed / high load region, the max side signal that makes the oil feed amount max is output (see FIG. 6).

The operation of this embodiment will be described with reference to the flowchart of FIG. When the program starts, the CPU 14 reads the engine speed and load, searches the map to calculate the unit request amount, and integrates the same, as in the above embodiment (steps S1 to S8).
Next, it is determined whether or not the integrated amount has reached the oil feed amount, and if it has reached, an OFF signal is output to the solenoid valve and the number of engine revolutions is integrated (steps S9 to S11). Next is determined whether the engine rotation number reaches a set number, and outputs an ON signal when it reaches, thereafter, the oil feeding quantity Pq subtracted from the integrated demand Q (Σq _Nn), carryover next Obtain the required amount Σq _{(N + 1) o} (step S
12-step S15).

Then, the next required carry-over amount Σq _{(N + 1) o} in step S15 is compared with the min oil feed amount Pq,
When this carry-over required amount is smaller than the min oil feed amount Pq, the next oil feed amount Pq is set to the min oil feed amount in step S17, and the min side signal is output to the actuator 30 (steps S17, S18), and step S4. Return to.
As a result, the amount of oil sent from the supply pump 16 is set to min.

On the other hand, if the carry-over required amount is greater than the min oil feed amount Pq in step S15, step S15 is executed.
In step 19, the next oil feed amount Pq is set to max, and step S2 is performed.
At 0, the max signal is output to the actuator 30, and then the process returns to step S4. As a result, the amount of oil sent from the supply pump 16 is set to max.

As described above, in the present embodiment, the oil feed amount of the supply pump 16 per one time is variable according to the operating state, so that the oil feed amount can be further reduced at low speed and low load. Further, the consumption of lubricating oil can be further reduced. Further, the oil feed amount can be made appropriate by reducing the oil feed amount at the time of low demand / low load with a small demand amount, and by increasing the oil feed amount at the time of high demand / high load with a large demand amount.

FIG. 7 is a schematic block diagram for explaining a lubricating oil supply device according to a modification of each of the above-described embodiments, which is an example in which a lubricating oil supply system 41 is constituted by one solenoid valve 40.

In this embodiment, each discharge passage 42 connected to the discharge side of the supply pump 16 is branched into a supply passage 43 and a return passage 44, and check valves 46 and 47 are provided in the middle of the respective passages 43 and 44. Intervene. Further, the return passages 44 are merged into one merge passage 45, and the merge passage 45
And the downstream end of the confluence passage 45 is connected to the lubricating oil tank 22. The supply passages 43 are connected to the lubricated portion of the engine 1.

The valve opening pressure Ps of each check valve 46 on the supply passage 43 side is set to be larger than the sum of the valve opening pressure Pr and the head pressure Ph of each check valve 47 on the return passage 44 side (Ps). > Pr + Ph). As a result, when the solenoid valve 40 is opened, the lubricating oil returns to the lubricating oil tank 22 without flowing into the engine side. In addition, when the solenoid valve 40 is closed, the lubricating oil is supplied to the engine side.

Further, a metal pipe made of stainless steel or the like is used in a portion extending from the discharge passage 42 to each of the check valves 46 and 47 (see a hatched portion in the drawing). By adopting this metal pipe, it is possible to prevent a volume change due to thermal expansion, and it is possible to accurately control the amount of lubricating oil supplied. By the way, when an elastic hose or the like is used in the shaded portion, there is a possibility that accurate flow rate control may not be possible due to expansion or the like. Of course, the lubricating oil supply amount can be accurately controlled by forming the discharge passage 23 in FIGS. 2 and 4 from a metal pipe.

In the above modified example, since one solenoid valve 40 can supply the lubricating oil to each lubricated portion of the engine, the cost can be reduced as compared with the case where a large number of solenoid valves are provided.

In each of the above embodiments, the case of a two-cycle diesel engine has been described as an example, but the scope of application of the present invention is not limited to this, and the invention can also be applied to a two-cycle gasoline engine.

[0041]

As described above, according to the lubricating oil supply device for an engine of the first aspect of the present invention, the lubricating oil consumption amount that changes every moment is calculated and integrated, and the integrated consumption amount of the supply pump is calculated. Since the lubrication system is kept in the lubricating oil supply state from the time when the amount of oil fed per time is reached to the time when the predetermined number of engine revolutions is reached, even if the engine revolution changes during oil feeding, It is possible to supply oil, and there is an effect that an appropriate amount of lubricating oil can be supplied without excess or deficiency.

According to the second aspect of the invention, since the amount of oil fed per supply pump is variable, the oil feeding interval can be made appropriate while ensuring the required maximum amount of oil fed, and the consumption amount can be reduced. There is an effect that it can be further reduced.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a lubricating oil supply device for an engine according to an embodiment of the present invention.

FIG. 2 is a schematic view of the apparatus of the above-mentioned embodiment.

FIG. 3 is a flow chart for explaining the operation of the apparatus of the above embodiment.

FIG. 4 is a schematic diagram of a lubricating oil supply device according to an embodiment of the invention of claim 2.

FIG. 5 is a flow chart for explaining the operation of the apparatus of the above embodiment.

FIG. 6 is a diagram showing an oil feed amount variable characteristic of the apparatus of the embodiment.

FIG. 7 is a schematic view of a lubricating oil supply device according to a modified example of the above embodiment.

[Explanation of symbols]

 1 Engine 12 Lubricating Oil Supply Device 14a Consumption Amount Calculation Means 14b Accumulation Means 14c Oil Supply Control Means 15 Reduction Mechanism 16 Supply Pump

Claims (2)

[Claims] 1. A lubricating oil for an engine, comprising: a supply pump driven by an engine through a speed reduction mechanism; and an oil supply system for intermittently supplying lubricating oil from the supply pump to each lubricated portion of the engine. In the supply device, a consumption amount calculating means for estimating and calculating the momentary lubricating oil consumption amount in each lubricated portion from the engine speed and the load, and an integration for integrating the momentary unit consumption amounts calculated by the calculating means Means, and an oil supply control means for holding the oil supply system in a lubricating oil supply state from the time when the integrated consumption amount by the integrating means reaches the amount of oil sent from the supply pump per time until a predetermined number of engine revolutions is reached. A lubricating oil supply device for an engine, comprising: 2. The supply pump according to claim 1, wherein
An oil feed amount variable type in which the oil feed amount per turn is variable, and an oil feed amount variable control means for variably controlling the oil feed amount of the supply pump according to the engine operating state is provided. Lubricating oil supply device for engine.