JPH01273813A - Feeding device for lubrication oil of engine - Google Patents

Abstract

PURPOSE:To feed the optimum lubrication oil without delay by suspending correction at the time when an engine load rises in case of correcting an oil adjusting means and the offset at the reference position of the electric actuator driving it. CONSTITUTION:A metaling oil pump 17 as for a lubrication oil feeding device is stored inside a housing 20 at its main plunger 21 and also stored in the one end part of the main plunger 21 at its auxiliary plunger 22. At the other end part side of the main plunger 21 in the housing 20 the control cam 25 controlling the reciprocating movement of the main plunger 21 as a lubrication oil adjusting means is arranged. A stepping motor 33 as for the actuator which drives the control cam 25 is arranged. In this case, at the time when the engine load rises during the specified correction operation period the operation correcting the offset at the reference position of the stepping motor 33 and control cam 25 is cancelled.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention mainly relates to a lubricating oil supply system for a vehicle engine, and particularly to a lubricating oil supply system in which the amount of lubricating oil supplied is controlled using an electric actuator.

(Prior Art) In rotary piston engines, two-stroke engines, etc., a lubricating oil supply device called a metering oil pump is used to prevent wear and tear of the combustion chamber walls, rotors, or seal members attached to the pistons. The lubricating oil is supplied to the combustion chamber using a lubricating oil supply device, and this supplying device is usually configured so that the amount of lubricating oil supplied is adjusted depending on the operating condition of the engine. There is one disclosed in Japanese Utility Model Publication No. 60-8100. As shown in Fig. 10, this is a plunger pump A.
, an adjustment lever B connected to an adjustment member (not shown) that adjusts the amount of movement of the plunger in the plunger pump A, that is, the discharge amount, and a throttle valve C disposed in the intake passage of the engine. It consists of a connecting rod D that connects the lever B, a return spring E that biases the adjustment lever B in the direction of reducing the discharge amount, and the like. and,
The amount of lubricating oil supplied to the combustion chamber is adjusted according to the operating state of the engine by operating a discharge amount adjustment member via the connecting rod D and adjustment lever B in response to opening and closing of the throttle valve C. It has become.

By the way, according to this lubricating oil supply device, the amount of lubricating oil supplied to the combustion chamber is adjusted only according to the opening degree of the throttle valve, which is one element of the operating state of the engine, and is adjusted depending on other factors such as the rotation speed. Since the elements are not adjusted, the supply amount does not necessarily match the required amount depending on the operating state, and since the supply amount is controlled by a link mechanism or the like, high accuracy cannot be obtained. Therefore, problems such as an increase in lubricant consumption due to excess lubricant supply and wear and damage on the combustion chamber walls and the like due to insufficient supply may occur.

Therefore, in recent years, in order to control the amount of lubricating oil supplied more appropriately and with high precision depending on the operating state of the engine, for example, the oil amount adjustment member that adjusts the amount of movement of the plunger in a plunger pump has been replaced with a stepping motor. In addition to being configured to be driven by an electric actuator such as
A device has been put into practical use that is equipped with a sensor that detects the amount of operation of the oil amount adjusting member by this actuator, and that operates the actuator in accordance with the output value of this sensor. According to this, the operating amount of the oil amount adjusting member is controlled according to a preset characteristic according to the operating state of the engine, and the amount of lubricating oil supplied to the combustion chamber is adjusted to the target oil amount corresponding to the operating state. You will be able to make adjustments with high precision.

(Problems to be Solved by the Invention) By the way, a lubricating oil supply device using an electric actuator as described above, in particular, an oil amount adjusting member so that the amount of supplied oil always matches a target oil amount according to the operating state of the engine. In a lubricating oil supply device that controls the operating amount of the actuator based on the position of the lubricant, it is necessary that the operating amounts of the actuator and the oil amount adjusting member always correspond correctly. Therefore, at a predetermined time such as when starting the engine, the amount of actuation of the actuator is set to zero, and the amount of offset at the zero point between the actuator and the oil amount adjustment member is confirmed based on the output value of the sensor at this time. So-called zero point correction is performed to correct the correspondence between the actuator and the oil amount adjusting member using the offset amount, but in this case, the following problems may occur.

In other words, this corrective action is normally performed after the engine is started, but in this case, the actuator or oil amount adjustment member is stopped at the position where it operated in the direction of increasing the amount of oil supplied when the engine was stopped last time. If this is the case, it will take some time to return these positions to the zero point, that is, the reference position, during this correction operation, and during this time, the engine load may be increased in an attempt to start the vehicle. sell. In this case, the actuator and the oil amount adjusting member are in the middle of returning to the reference position and are operating in the direction of decreasing the supplied oil amount, so even if the target oil amount is increased due to an increase in load, The actual amount of supplied oil cannot quickly follow the increase in the target amount of oil, and as a result, a situation occurs where the amount of lubricating oil supplied is temporarily insufficient immediately after the vehicle starts. In particular, if the engine was stopped with so-called idling during the previous operation stop, the actuator and oil amount adjustment member will stop at a position where the amount of oil supplied has increased by a considerable amount from the reference position. Therefore, the time required for the offset correction operation at the next start-up becomes longer, and the possibility that the vehicle will be started during this correction operation increases accordingly, making the above-mentioned problem more likely to occur.

Therefore, the present invention provides an engine lubricating oil supply device that adjusts the amount of lubricating oil supplied to a combustion chamber by driving an oil amount adjusting member with an electric actuator as described above. It is an object of the present invention to supply lubricating oil immediately on demand even when the engine load increases during an offset correction operation of an adjusting member.

(Means for Solving the Problems) In order to achieve the above object, the present invention is characterized by the following configuration.

That is, the present invention includes an oil amount adjusting means for adjusting the amount of lubricating oil supplied to the engine, an electric actuator for driving the adjusting means, and an actuator for operating the actuator so that the operating position of the adjusting means is a target position. In the lubricating oil supply device for an engine having a control means, a reference position correction means is provided for correcting the offset between the reference positions of the actuator and the oil amount adjustment means, and during a predetermined correction operation period in which the reference position correction means operates. engine load rise detection means for detecting a rise in engine load during the period; and correction operation canceling means for canceling the operation of the reference position correction means when the detection means detects that the engine load has risen during the period. It is characterized by having the following.

In addition to the above configuration, when the correction operation canceling means cancels the offset correction operation of the actuator and oil amount adjusting means by the reference position correction means, the correction amount used in the previous correction operation is used to adjust the offset correction of the actuator and oil amount. Auxiliary correction means may be provided for correcting the offset of the amount adjustment means.

(Function) According to the above configuration, at a predetermined time such as when the engine is started, the reference position correction means corrects the offset between the reference positions of the actuator and the oil amount adjustment means, thereby adjusting the operation of the actuator and the oil amount adjustment means. Since the amounts correspond correctly, the amount of lubricating oil supplied to the engine can be accurately adjusted to the target oil amount depending on the operating state. Particularly, according to the present invention, if the engine load rises during the above-mentioned corrective operation, the corrective action canceling means cancels the corrective action and immediately performs lubricant supply control according to the operating state. You will be killed. Therefore,
Even when the engine load increases rapidly, the required amount of lubricating oil is supplied without delay.

Furthermore, when the offset correction operation is canceled as described above, if the auxiliary correction means corrects the offset between the actuator and the oil amount adjustment means using the amount of correction used in the previous correction operation, it is possible to The amount of lubricating oil supplied can be accurately controlled even when the vehicle suddenly starts.

(Example) Hereinafter, an example in which the present invention is applied to a rotary piston engine will be described.

First, the schematic structure of the rotary piston engine according to the present embodiment will be explained with reference to FIG. It is constituted by an arranged side housing 3.3. A substantially triangular rotor 4 that rotates planetarily is housed in the casing 1, and the inside of the casing 1 is divided into three working chambers 5a, 5b, and 5c. By sequentially performing the intake, compression, explosion, and exhaust strokes as the rotor 4 rotates,
The power generated at this time is output from the eccentric shaft 6. The gauging 1 also includes an intake boat 7 that is opened at a predetermined position of one side housing 3 and communicates with the working chamber 5a during the intake stroke, and a rotor housing 2.
An exhaust boat 8 is provided which is opened at a predetermined position and communicates with the working chamber 5C during the exhaust process, and an intake passage 9 and an exhaust passage 10 are connected to the intake boat 7 and the exhaust boat 8, respectively. Further, a pair of spark plugs 11.11 are attached to predetermined positions of the rotor housing 2, and an injector 1 for injecting fuel is installed in the intake passage 9.
2 are arranged.

Further, a boat oil supply nozzle 13 for supplying lubricating oil is disposed in the intake passage 9, and a direct oil supply nozzle 14 is disposed in the rotor housing 2 at a position facing the working chamber 5a during the intake stroke. Air passages 15.16 that supply air for injecting lubricating oil are connected to these oil supply nozzles 13.14, respectively, and a metering that supplies lubricating oil to these oil supply nozzles 13.14 is connected to each of them. An oil pump 17 is provided, and the pump 17 and both oil supply nozzles 13.14 are connected to an oil supply pipe 18.19.
are connected to each other by.

Next, the specific structure of the metering oil pump 17 will be explained with reference to FIG. It has an auxiliary plunger 22 that is movably housed, and these plungers 2
1.22 Measurement of lubricating oil for boat refueling,
A first measuring chamber 23 that performs a discharging operation and a second measuring chamber 24 that performs a measuring and discharging operation of lubricating oil for direct oil supply are formed.

A control cam 25 is slidably inserted into the other end of the main plunger 21 in the pump housing 20 and is arranged in a direction perpendicular to the plunger 21 to control the amount of reciprocating movement of the plunger 21. , a pair of protrusions 21a provided on the cam 25 at the tip of the main plunger 21;
A tapered surface 25a and a cylindrical surface 25b are provided with which the main plunger 21b comes into contact.
a spring 26 that presses the control cam 25 against the circumferential surface of the control cam 25;
is installed. A gear portion 21c is provided in the intermediate portion of the main plunger 21, and a driving worm 27 that rotates in conjunction with engine rotation is attached to the gear portion 21c.
The main plunger 21 is rotationally driven by the driving worm 27 in synchronization with engine rotation, so that the protrusions 21a and 21b alternately contact the tapered surface 25a and the cylindrical surface 25b of the control cam 25. This causes the plunger 21 to reciprocate. Then, the above-mentioned 1.
Due to the change in the volume of the second metering chamber 23,24, lubricating oil flows from the suction passage 28 to the first metering chamber 23,24. The first and second metering chambers 23.24 pass through the second suction boat 29.30, and the first and second metering chambers 23.24 pass through the first and second discharge boats 31.32. Lubricating oil is discharged to second oil supply pipes 18 and 19, respectively.

Here, the discharge amount of the pump 17 is adjusted by moving the control cam 25 in the axial direction so that the protrusions 21a, 21b of the main plunger 21 and the tapered surface 25a of the cam 25 are adjusted.
This is done by changing the contact position with the

A stepping motor 33 is provided for driving the control cam 25 in the axial direction, and a bushing rod 33a of the stepping motor 33 protrudes to drive the control cam 25 through a disk member 34 fixed to one end thereof. The main plunger 21 is driven in a direction in which the amount of reciprocating movement, that is, the discharge amount increases, and the bushing rod 3
When the pump 3a retreats, a return spring 35 interposed between the disk member 34 and the pump housing 16 moves the control cam 25 in a direction that reduces the discharge amount. Incidentally, the rotation of the disc member 34 or the control cam 25 indicated by -E is prevented by a pin 36 provided upright on the pump housing 16.

Furthermore, a position sensor 37 for detecting the position of the control cam 25 is provided for drive control of the stepping motor 33 that drives the control cam 25 and adjusts the discharge amount as described above.

This position sensor 37 has a contactor 37a that is connected to the control cam 2.
The contactor 37a is always in contact with the above-mentioned disk member 34 fixedly attached to the control cam 25, so that the contactor 37a always moves by the same amount as the control cam 25 via the disk member 34. , the output voltage changes according to the characteristics shown in FIG.

Then, as shown in FIG. 1, the position sensor 3
A control unit 40 is provided to control the operation of the stepping motor 33 according to the output of the motor 7. The configuration of this control unit 40 will be explained with reference to FIG. A signal S1 from the air flow meter 44 that detects the amount of intake air, a signal S2 from the engine rotation sensor 45 that detects the engine rotation speed, and a signal S from the water temperature sensor 46 that detects the temperature of the engine cooling water. An output signal S4 from an atmospheric pressure sensor 47 that measures atmospheric pressure is input.

The first calculation unit 41 then processes each of the signals Sl to S4.
The target position of the control cam 25 is set so that the lubricant supply amount corresponds to the operating state of the engine indicated by , and this target position is sent to the second calculation section 42, and the second calculation section 42
The number of driving steps of the stepping motor 33 corresponding to this target position, or the number of driving steps of the stepping motor 33 necessary to eliminate the deviation between the target position and the actual position of the control cam 25 indicated by the output signal S5 from the position sensor 37. The number of drive steps is calculated and this value is sent to the output section 43. The output section 43 outputs a control signal S6 to drive the stepping motor 33 by the number of steps mentioned above.

In addition, in order to more accurately control the amount of lubricant supplied as described above, this control unit 40 corrects the offset between the standard positions of the steng motor 33 and the control cam 25 at the time of engine startup as a system initialization. It is designed to be controlled.

Next, each of the above control operations will be specifically explained according to the flowcharts shown in FIG. 5 and subsequent figures.

First, the normal lubricating oil amount adjustment control will be explained with reference to FIG. 5. In this control, the control unit 40 controls the intake air amount Q, engine rotation speed N, The engine coolant temperature W and atmospheric pressure P are read, and then in step P2, the amount of intake air per revolution of the engine (Q/N) and the coolant temperature W are read.
and atmospheric pressure P, the fuel injection amount T according to the operating state of the engine is calculated according to the following equation (I).

``r=1×a1WXα2 PXQ/N−(I) where K8.α1.α2 is a constant.

Next, in step P3, the target position I of the control cam 25 is determined from the fuel injection amount T and the engine rotation speed N calculated as described above. That is, the position of the control cam 25 at which the amount of lubricating oil supplied according to the operating state of the engine is obtained is calculated according to the following equation (II).

Io = 2 XTXNβ ・<n> where K2. β is a constant.

Then, in step P4, the actual position (2) of the control cam 25 is read based on the output signal S from the position sensor 37, and the target position I is determined. Which deviation is determined, and the number n of drive steps of the stepping motor 33 corresponding to the deviation is calculated, and a control signal S6 is output to the motor 33 so as to drive the stepping motor 33 by the number of steps n. Thereafter, in step P6, the actual position of the control cam 25 is detected, and in step P7, the lever position I and the target position I are detected. If the actual position I is equal to or higher than the target position 10, the control is terminated and the actual position I becomes the target position 0.
If it is smaller, steps P4 to P7 are repeated. In this way, in the former case 1, that is, when the supply amount is to be reduced, the supply amount is adjusted by oven control that only outputs the control signal S5 to the stepping motor 33 once, and in the latter case, that is, when the supply amount is to be decreased. When increasing the amount, change the actual position ■ of the control cam 25 to the target position 1.
．． The amount of lubricating oil supplied is adjusted by feedback control that repeatedly outputs the control signal S5 so as to converge on the amount of lubricating oil.

By the way, in the above-mentioned operation of adjusting the supply amount of lubricating oil, especially in the case of oven control, it is necessary to always correctly match the number of driving steps of the stepping motor 33 and the position of the control cam 25. . In other words, when used for a long period of time, the relationship between the operating amounts of the control cam 25 and the bushing rod 33a of the stepping motor 33 becomes out of order due to wear and other factors, and in such a case, the control cam 25 becomes In an attempt to move the stepping motor 33 to a target position where a lubricant supply amount corresponding to the operating condition can be obtained, the stepping motor 33 is moved by the number of steps corresponding to that position.
Even if the control cam 25 is operated, the control cam 25 will not be driven to its target position. Therefore, initialization control is performed to correct the above-mentioned deviations, and this control will be explained next.

This control is performed according to the flowchart shown in FIG.
First, when starting the engine at step pH, wait for the rotation speed Ne to reach the complete explosion speed of 500 RPM or more, and then, when the rotation speed reaches or exceeds this speed, set the predetermined conditions for performing learning control in step PI2. It is determined whether or not the condition has been established, and if not, in order to perform normal initialization control, first wait for 2 seconds for the battery output voltage to stabilize, etc. according to step P13 + PI3, and then, The output voltage value Vp is input based on the signal S5 from the position sensor 37.

Next, in step P15, this output voltage value Vp is changed to the voltage value corresponding to 6 steps of the stepping motor 33 (the voltage output from the position sensor 37 depending on the position of the control cam 25 when the stepping motor 33 operates 6 steps from the zero point). It is determined whether the value (for example, 1.32v) is greater than or equal to Vs6. When Vp≧Vs6, in other words, when the engine was stopped last time, the stepping motor 33
or when the control cam 25 stops at a position where the amount of lubricant supplied is considerably large, the actual output voltage value V is determined in step P16.
A voltage value Vs5 corresponding to 5 steps from p (for example, 1.2
In order to operate the Stellar pin motor 33 in the direction of the zero point by the number of steps corresponding to the value obtained by subtracting 7V), a reversal pulse corresponding to the number of steps is output as the control signal S6. In that case, this reversal pulse is output at a relatively high frequency to facilitate the control action. Thereafter, in step P17, an abutting pulse in the reverse direction of 5 steps of α is outputted at a relatively low frequency.

Here, to explain the above-mentioned zero point return operation of the stepping motor 33 with reference to FIG.
After a standby time of 2 seconds, the stepping motor 33 is relatively quickly returned to the position 5 steps from the previous stop position by outputting the reverse pulse in step PI6, and from this 5 step position, the step PI6 is output. By outputting the abutment pulse by P1, the return to the zero point is performed relatively gently. Note that if it is determined in step PI5 that Vp<Vs6,
If the stop position of the stepping motor 33 at the previous stop of the jam is less than the 6 step position, the high-frequency reversal pulse is not output in step PI6, and step P
17 only outputs a striking pulse at a low frequency.

When the stepping motor 33 is returned to the zero point in this way, the output voltage value Vpo of the position sensor 37 at that time is inputted in step PI8, and this value is set to 4.
It is determined whether or not the voltage value Vs4 (for example, 1.21V) corresponding to the step is lower than or not, and in the following cases, step P19 is performed.
+ P 20, the output voltage value V po is stored as the offset amount between the stepping motor 33 and the control cam 25 at the zero point. Then, while correcting the correspondence between the number of steps of the stepping motor 33 and the position of the control cam 25 based on this offset amount, the lubricant supply amount adjustment control shown in the flowchart of FIG. 5 is performed.

Note that when it is determined in step P12 that the predetermined learning condition is satisfied, for example, during the first operation after engine production or a predetermined number of times (for example, 32
When the battery output voltage value is equal to or higher than the set value (e.g. 11V) and the engine cooling water temperature is equal to or higher than the set value (e.g. 10°C),
In step P21, control is performed to learn the position of the control cam 25 (output voltage value of the position sensor 37) with respect to the operation of the stepping motor 33. As shown by the chain line in FIG. 7, this learning control is performed following the initialization control for checking the offset amount at the zero point, and after returning the stepping motor 33 to the zero position, the maximum operating position ( This is done by reading the output voltage value of the position sensor 37 at each assigned value while operating up to 60 steps, for example. Then, the correspondence between the number of operating steps of the stepping motor 33 and the position of the control cam 25 is updated according to this learning result.

Further, in step PI9, when the output voltage value VPo of the position sensor 37 at the zero point of the stepping motor 33 is larger than the voltage value Vs4 corresponding to 4 steps, the control cam 25 for the stepping motor 33
Otherwise, it is determined that the offset amount of the position sensor 37 is excessive and that there is some kind of abnormality, and the process proceeds to step P2.
Perform fail-safe control using □. This control may limit fuel or ignition, for example.

If an attempt is made to start the vehicle during the initialization operation as described above, control is performed to cancel the initialization operation at the time of sudden start according to the flowchart of FIG. 8.

This control is performed in parallel with the control shown in FIG.
31. After the initialization operation is started at P32, the stepping motor 33 is set according to the operating state of the engine.
It is determined whether the target number of steps is less than or equal to 5 steps. The operating state in which the target number of steps is 5 is the operating state shown by line X in FIG. The amount will increase in the direction of increase.

If it has not exceeded this line
The offset amount Vpo obtained by this initialization operation
The lubricating oil supply amount is adjusted and controlled while correcting the position of the control cam 25 with respect to the number of steps of the stepping motor 33.

On the other hand, when the above line At the same time, in step P35, the offset amount VPO' of the control cam 25 with respect to the number of steps of the stepping motor 33 obtained by the initialization operation at the time of the previous startup is adopted,
This offset amount VPO' corrects the correspondence between the operating amounts of the stepping motor 33 and the control cam 25.

As a result, even if the engine load increases during the initialization operation, an amount of lubricating oil corresponding to the operating state is immediately supplied. In this case as well, since the offset is corrected, the amount of lubricating oil supplied can be adjusted with high precision.

(Effects of the Invention) As described above, according to the present invention, the amount of lubricating oil supplied to the engine is adjusted to the amount corresponding to the operating condition by driving the oil amount adjusting means to the target position using the electric actuator. In the engine lubricating oil supply device configured to correct the offset between the reference position of the electric actuator and the oil amount adjusting means at the time of starting the engine, etc., the vehicle is started during the offset correction operation. Since this corrective operation is canceled when the engine load increases due to a sudden start, the amount of lubricating oil corresponding to the operating condition can be supplied without delay even when the vehicle starts suddenly. Further, in that case, if the offset between the electric actuator and the oil amount adjusting means is corrected using the correction amount used in the previous offset correction, the supply amount of lubricating oil can be adjusted with high accuracy.

This reliably prevents the supply of lubricating oil from being delayed and causing wear and tear on the inner wall surface of the combustion chamber and the seal member slidingly in contact with the surface when the engine suddenly starts as described above.

[Brief explanation of the drawing]

1 to 9 show embodiments of the present invention, and FIG. 1 is a sectional view of a rotary piston engine to which the present invention is applied;
Fig. 2 is a sectional view of a measuring oil pump constituting the lubricating oil supply device according to this embodiment, Fig. 3 is an output characteristic diagram of a position sensor provided in the pump, and Fig. 4 is a diagram of the measuring oil pump that constitutes the lubricating oil supply device according to the present embodiment. Control system diagram, Fig. 5 is a flowchart showing lubricating oil amount adjustment control, Fig. 6 is a flowchart showing initialization control, Fig. 7 is an explanatory diagram of the operation of this initialization control, and Fig. 8 is at the time of sudden start. FIG. 9 is a flowchart showing this control and is a map for sudden start determination used in this control. Moreover, FIG. 10 is a schematic diagram showing a conventional lubricating oil supply device. 17... Lubricating oil supply device (measuring oil bomb), 25... Oil amount adjustment means (control cam), 33...
Electric actuator (stepping motor), 40...
・Reference position correction means, engine load rise detection means,
Correction operation canceling means, auxiliary correction means (control unit.

Claims (2)

[Claims] (1) Oil amount adjusting means for adjusting the amount of lubricating oil supplied into the engine, an electric actuator for driving the adjusting means, and control for operating the actuator so that the operating position of the adjusting means becomes a target position. a reference position correction means for correcting the offset in the reference position between the actuator and the oil amount adjustment means; and an engine load during a predetermined correction operation period in which the correction means operates. engine load rise detection means for detecting a rise in the engine load; and correction operation canceling means for canceling the operation of the reference position correction means when the detection means detects that the engine load has risen during the above period. An engine lubricating oil supply device characterized by: (2) An auxiliary correction means is provided for correcting the offset between the actuator and the oil amount adjusting means using the correction amount used in the previous correction operation when the correction operation by the reference position correction means is canceled by the correction operation canceling means. An engine lubricating oil supply device according to claim 1, characterized in that: