JP2579606B2 - Engine lubricant supply device - Google Patents

Description

The present invention mainly relates to a lubricating oil supply device for a vehicle engine,
In particular, the present invention relates to a lubricating oil supply device that controls the supply amount of lubricating oil using an electric actuator.

(Prior Art) In a rotary piston engine, a two-stroke engine or the like, a lubricating oil supply device called a metering oil pump is used in order to prevent abrasion of a combustion chamber wall, a seal member mounted on a rotor or a piston, and the like. The lubricating oil is supplied to the combustion chamber through the combustion chamber. In general, the supply device is configured so that the amount of the lubricating oil supplied is adjusted according to the operating state of the engine. There is one disclosed in Japanese Patent Publication No. 60-8100. As shown in FIG. 10, this includes a plunger pump A, an adjustment lever B connected to an adjustment member (not shown) for adjusting the amount of movement of the plunger in the plunger pump A, that is, the discharge amount, and It comprises a connecting rod D for connecting the adjusting lever B to a throttle valve C disposed in the intake passage, a return spring E for urging the adjusting lever B in a discharge amount decreasing direction, and the like. The amount of lubricating oil supplied to the combustion chamber is adjusted according to the operating state of the engine by operating the discharge amount adjusting member via the connecting rod D and the adjusting lever B according to the 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 in accordance with the opening degree of the throttle valve, which is one element of the operating state of the engine. Since it is not adjusted for the element,
The supply amount does not always match the required amount according to the operating condition,
Further, since the supply amount is controlled by a link mechanism or the like, there is a tendency that high accuracy cannot be obtained. For this reason, there is a possibility that problems such as an increase in consumption of lubricating oil due to excessive supply of lubricating oil and wear and damage on the combustion chamber walls due to insufficient supply of lubricating oil may occur.

Therefore, in recent years, in order to more appropriately and accurately control the supply amount of the lubricating oil in accordance with the operation state of the engine, for example, an oil amount adjusting member that adjusts the movement amount of the plunger in the plunger pump is provided by a stepping motor. In addition to a configuration in which the actuator is configured to be driven by an electric actuator such as that described above, a sensor that detects the amount of operation of the oil amount adjustment member by the actuator is provided, and the actuator is operated in accordance with an output value of the sensor. Has been According to this, the operation amount of the oil amount adjustment member is controlled by a characteristic according to a preset operation state of the engine, and the supply amount of the lubricating oil to the combustion chamber is set to the target oil amount corresponding to the operation state. It can be adjusted with high accuracy.

(Problems to be Solved by the Invention) By the way, a lubricating oil supply device using the above-described electric actuator, particularly an oil amount adjusting member such that the amount of supplied oil always coincides with a target oil amount according to the operating state of the engine. In the lubricating oil supply device in which the operation amount of the actuator is controlled based on the position, it is necessary that the operation amount of the actuator and the operation amount of the oil amount adjusting member always correspond to each other correctly. Therefore, for example, at a predetermined time such as when the engine is started, the operation amount of the actuator is set to zero, and based on the output value of the sensor at this time, the offset amount of the actuator and the oil amount adjustment member at the zero point is confirmed. So-called zero point correction for correcting the correspondence between the actuator and the oil amount adjusting member based on the offset amount is performed. In this case, the following problem may occur.

In other words, this correction operation is generally performed after the start of the engine at the time of starting.In this case, the actuator or the oil amount adjusting member is stopped at the position where the actuator or the oil amount adjusting member was operated in the increasing direction of the supplied oil amount at the time of the previous engine stop. In this case, it takes a certain amount of time to return these positions to the zero point, that is, the reference position during the current correction operation,
In the meantime, there is a possibility that the load of the engine is increased in order to start the vehicle. In this case, since the actuator and the oil amount adjusting member are in the middle of the return operation to the reference position and are operating in the direction of decreasing the supplied oil amount, even if the target oil amount is increased by the increase in the load, The actual supply oil amount cannot quickly follow the increase in the target oil amount, so that a shortage of the supply amount of the lubricating oil occurs immediately after the start. In particular, when the engine was stopped by so-called idling at the previous operation stop, the actuator and the oil amount adjusting member are stopped at a position where a considerable amount of operation has been performed from the reference position in the increasing direction of the supplied oil amount. Therefore, the time required for the offset correction operation at the next start is lengthened, and the possibility of starting during this correction operation is increased, and the above-described problem is likely to occur.

Accordingly, the present invention provides a lubricating oil supply device for an engine in which the amount of lubricating oil supplied to a combustion chamber is adjusted by driving an oil amount adjusting member by an electric actuator as described above. It is an object of the present invention to supply lubricating oil immediately upon request even when the load on the engine rises during the offset correcting operation of the adjusting member.

(Means for Solving the Problems) In order to achieve the above object, the present invention is characterized in that it is configured as follows.

That is, the present invention provides an oil amount adjusting means for adjusting an amount of lubricating oil supplied to an engine, an electric actuator for driving the adjusting means, and operating the actuator so that the operating position of the adjusting means is a target position. In a lubricating oil supply device for an engine having a control unit, a reference position correcting unit for correcting an offset of the actuator and the oil amount adjusting unit at a reference position is provided, and during a predetermined correcting operation period in which the reference position correcting unit operates. Engine load rise detection means for detecting the rise of the engine load in the above, and correction operation cancel 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.

In addition to the above configuration, when the correction operation canceling unit cancels the offset correcting operation of the actuator and the oil amount adjusting unit by the reference position correcting unit, the actuator and the oil are corrected by the correction amount used in the previous correcting operation. An auxiliary correcting means for correcting the offset of the amount adjusting means may be provided.

(Operation) According to the above configuration, the offset of the actuator and the oil amount adjusting means at the reference position is corrected by the reference position correcting means at a predetermined time, such as when the engine is started, so that these operating amounts are adjusted. Corresponds correctly, and the supply amount of the lubricating oil to the engine is accurately adjusted to the target oil amount according to the operating state. In particular, according to the present invention, when the engine load rises during the above-described correcting operation, the correcting operation is canceled by the correcting operation canceling unit, and the supply control of the lubricating oil according to the operating state is immediately performed. Will be Therefore,
Even at such a rapid rise of the engine load, the required amount of lubricating oil is supplied without delay.

Further, when the offset correcting operation is canceled as described above, if the auxiliary correcting unit corrects the offset between the actuator and the oil amount adjusting unit with the correction amount used at the time of the previous correcting operation, Even when the vehicle suddenly starts, etc., the supply amount of the lubricating oil is accurately controlled.

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

First, a schematic configuration of a rotary piston engine according to the present embodiment will be described with reference to FIG. 1. A casing 1 of the engine includes a rotor housing 2 having an inner peripheral surface 2a that draws a trochoid curve, and two side surfaces of the housing 2. It is constituted by the side housings 3, 3 arranged.
A substantially triangular rotor 4 for planetary rotation is accommodated in the casing 1, and the inside of the casing 1
Divided into two working chambers 5a, 5b, 5c, and these working chambers 5a, 5b,
5c sequentially performs the intake, compression, explosion, and exhaust strokes with the rotation of the rotor 4, so that the power generated at that time is output from the eccentric shaft 6. Also,
The casing 1 has an intake port 7 which is opened at a predetermined position of one of the side housings 3 and communicates with a working chamber 5a during an intake stroke, and a working chamber 5c which is opened at a predetermined position of the rotor housing 2 and is in an exhaust process. An exhaust port 8 communicating with the intake port 7 is provided, and an intake passage 9 and an exhaust passage 10 are connected to the intake port 7 and the exhaust port 8, respectively. Also,
At a predetermined position of the rotor housing 2, a pair of spark plugs 1
At the same time, an injector 12 for injecting fuel is disposed in the intake passage 9.

Further, a port oil supply nozzle 13 for supplying lubricating oil is provided in the intake passage 9, and a direct oil supply nozzle is provided at a position facing the working chamber 5 a during the intake stroke in the rotor housing 2.
14 are provided respectively. Air passages 15 and 16 for supplying air for injecting lubricating oil are connected to these refueling nozzles 13 and 14, respectively, and a metal ring for supplying lubricating oil to these refueling nozzles 13 and 14 is provided. An oil pump 17 is provided, and the pump 17 and both oil supply nozzles are provided.
13 and 14 are connected by oil supply pipes 18 and 19, respectively.

Next, the specific structure of the metering oil pump 17 will be described with reference to FIG. 2. The pump 17 is composed of a main plunger 21 reciprocally housed in a pump housing 20.
A first measuring chamber 23 having an auxiliary plunger 22 which is also housed in one end thereof so as to be able to reciprocate, and which performs a light-weight and discharge operation of lubricating oil for port lubrication by these plungers 21, 22; There is formed a second measuring chamber 24 which performs a measuring and discharging operation of the lubricating oil for direct lubrication.

The main plunger in the pump housing 20
A control cam 25 that is disposed in the direction perpendicular to the plunger 21 and controls the reciprocating amount of the plunger 21 is slidably fitted to the other end of the main plunger 21.
A tapered surface 25a and a cylindrical surface 25b are provided at which a pair of protrusions 21a and 21b provided at the tip of the main plunger abut, and an end of the main plunger 21 in which the auxiliary plunger 22 is housed, A spring 26 for pressing the main plunger 21 against the peripheral surface of the control cam 25 is provided. A gear portion 21c is provided at an intermediate portion of the main plunger 21, and the gear portion 2c is provided.
The driving worm 27 that rotates in conjunction with the engine rotation is meshed with 1c.
The main plunger 21 is driven to rotate in synchronization with the engine rotation, whereby the protrusions 21a and 21b
Alternately abut against the tapered surface 25a and the cylindrical surface 25b, whereby the plunger 21 is reciprocated. The first and second weighing chambers 23, 24 associated with the reciprocating motion
Due to the change in the volume of the lubricating oil, the first and second lubricating oil
It is sucked into the first and second measuring chambers 23 and 24 through the suction ports 29 and 30, and the first and second discharging ports 31 and 32 are supplied from both the measuring chambers 23 and 24.
To discharge the lubricating oil to the first and 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 protrusion 21 of the main plunger 21 is moved.
This is performed by changing the contact position between a, 21b and the tapered surface 25a of the cam 25.

Further, a stepping motor 33 is provided for driving the control cam 25 in the axial direction. The protrusion of the push rod 33a in the stepping motor 33 causes the control cam 25 to move through a disk member 34 fixed to one end thereof. The main plunger 21 is driven in a direction to increase the reciprocating movement amount, that is, the discharge amount, and is controlled by a return spring 35 interposed between the disk member 34 and the pump housing 16 when the push rod 33a is retracted. The cam 25 is moved in a direction in which the discharge amount decreases.
The rotation of the disk member 34 or the control cam 25 is prevented by a pin 36 provided upright on the pump housing 16.

Further, a position sensor for detecting the position of the control cam 25 for driving control of the stepping motor 33 for adjusting the discharge amount by driving the control cam 25 as described above.
37 are provided. This position sensor 37 is
37a is always in contact with the disk member 34 fixed to the control cam 25, so that the stylus 37a always moves by the same amount as the control cam 25 via the disk member 34. The output voltage changes with the characteristics shown in FIG. 3 according to the amount.

Then, as shown in FIG.
A control unit 40 for controlling the operation of the stepping motor 33 in accordance with the output of 37 is provided. This control unit
The structure of the control unit 40 will be described with reference to FIG.
40 includes a first operation unit 41 is composed of a second operation unit 42 and the output unit 43, the first arithmetic unit 41, and the signals S ₁ from an air flow meter 44 for detecting an intake air amount of the engine, Signal S ₂ from engine rotation sensor 45 that detects the engine speed
When a signal S ₃ from the water temperature sensor 46 for detecting the water temperature of the engine cooling water, so that the output signal S ₄ from the atmospheric pressure sensor 47 for measuring the atmospheric pressure is inputted.

Then, the first calculation unit 41 sets the target position of the control cam 25 so that the lubricating oil supply amount according to the operating state of the engine indicated by each of the signals S _{1 to} S ₄ is set, and this target position is set. This is sent to the second calculating unit 42, and the second calculating unit 42 calculates the number of driving steps of the stepping motor 33 corresponding to the target position,
Or calculates the number of drive steps of the target position and the position sensor 37 output signal the stepping motor 33 necessary to eliminate the deviation of the actual position of the S ₅ the control cam 25 shown from the output unit 43 the value To send to. Then, the output unit 43, and outputs a control signal S ₆ to drive only the number of steps to the stepping motor 33.

In order to more accurately control the lubricating oil supply amount as described above, the control unit 40 corrects the offset of the stepping motor 33 and the control cam 25 at the reference position at the start of the engine as the system initialization. Control is performed.

Next, each of the above control operations will be specifically described with reference to the flowcharts of FIG.

First, control of normal lubricating oil amount adjustment will be described with reference to FIG.
, The step P ₁ in the intake air amount based on the respective signals S ₁ to S ₄ Q, the engine rotational speed N, reads the water temperature W and atmospheric pressure P of the engine cooling water, and then 1 rotation per engine in step P ₂ From the intake air amount (Q / N), the coolant temperature W, and the atmospheric pressure P, the fuel injection amount T according to the operating state of the engine is calculated according to the following equation (I).

T = K ₁ × α ₁ W × α ₂ P × Q / N (I) Here, K ₁ , α ₁ , and α ₂ are constants.

Next, the target position of the control cam 25 from the above way with the calculated fuel injection amount T and the engine speed N in Step P ₃
I ₀ , that is, the position of the control cam 25 at which the supply amount of the lubricating oil is obtained according to the operation state of the engine is calculated according to the following equation (II).

I ₀ = K ₂ × T × N ^β (II) where K ₂ and β are constants.

Then, read on the basis of the actual position I of the control cam 25 to the output signal S ₅ from the position sensor 37 in step P _4, with a deviation between the target position I _0, the stepping motor 33 corresponding to the deviation calculate the number of driving steps n, and outputs a control signal S ₆ to the motor 33 to drive the step number n by the stepping motor 33. Then, to detect the position I of the real control cam 25 in step P _6,
In Step P ₇ is compared with the position I and the target position I _0,
If the actual position I is above the target position I ₀ ends the control, actual position I if the target position I ₀ is smaller than repeatedly executes step P ₄ to P _7. Thus, in the former case, that is to adjust the supply amount by an open control only a control signal S ₅ 1 once the stepping motor 33 in the case of reducing the supply amount, and if the latter, that is supplied If increasing the amount to adjust the amount of lubricating oil supplied by a feedback control to repeatedly output the control signal S ₅ so as to converge the actual position I of the control cam 25 to the target position I _0.

By the way, in the above-described operation of adjusting the supply amount of the lubricating oil, particularly in the case of the open control, it is necessary that the number of driving steps of the stepping motor 33 always correspond to the position of the control cam 25 correctly. . In other words, in long-term use, the control cam 25 and the stepping motor 33
In such a case, the correspondence between the two operation amounts is disturbed due to wear or the like at the contact portion with the push rod 33a. Even if the stepping motor 33 is operated by the number of steps corresponding to the position, the control cam 25 is not driven to the target position. Therefore, initialization control for correcting the above-mentioned inconsistency is performed. Next, this control will be described.

This control is performed in accordance with flow chart shown in FIG. 6, waits for the rotational speed Ne at the start of the engine is 500RPM or a self-rotational speed First, in step P _11. And
When it becomes the rotation number or more, it is determined whether a predetermined condition is satisfied for performing learning control in step P _12, if not satisfied, to perform the normal initialization control step P according _13, P _14, first stabilization wait 2 seconds to wait for the battery output voltage, then, inputs the output voltage value V _P by a signal S ₅ from the position sensor 37.

Next, the control cam when the output voltage value Vp is six steps corresponding voltage value of the stepping motor 33 (stepping motor 33 has six steps operated from the zero point in step P ₁₅
It is determined whether or not the voltage value output from the position sensor 37 (for example, 1.32 V) VS ₆ or more according to the position of 25. Then, when the Vp ≧ VS _6, in other words, when at the time of previous engine stop Sutte Tsu ping motor 33 and control cam 25 is stopped at a position where the amount of supply is considerably more lubricant, step
Voltage value V of the 5 steps equivalent from actual output voltage value Vp in P ₁₆
In order to operate the stepping motor 33 in the direction of the zero point by the number of steps corresponding to the value obtained by subtracting S ₅ (for example, 1.27 V), the control signal is supplied with a reverse rotation pulse corresponding to the number of steps.
To output as S _6. In this case, the reverse pulse is output at a relatively high frequency in order to facilitate the control operation. Thereafter, outputs at a relatively low frequency reversing the direction of abutment pulse in step P ₁₇ 5 Step minute + alpha.

Here, the operation of the zero point return of more stepping motor 33 will be described by FIG. 7, En'n of complete explosion, on passing through the two-second waiting time, the output of the reverse rotation pulse by the step P _16, a stepping The motor 33 is returned relatively quickly from the previous stop position to the position of five steps, and from the position of five steps,
The output of the abutment pulse by P _17, is cause relatively slowly returned to the zero point. Step P
If it is determined that Vp <VS ₆ at _15, that is, when the stop position of the previous stop of the stepping motor 33 is less than 6 step position, the output of the reverse rotation pulse at high frequency in step P ₁₆ is not performed, the step P Only the output of the strike pulse at a low frequency by ₁₇ is performed.

Thus, when the stepping motor 33 is returned to zero, then inputs the output voltage value VP ₀ position sensor 37 at that time in step P _18, a voltage value VS ₄ This value is equivalent to 4 steps (e.g., 1.21V) and determines whether the following, in the following cases, in accordance with step P _19, P _20, the stepping motor 33 and the output voltage value VP ₀ at the zero point
And the offset amount between the control cam 25 and the control cam 25. Then, while adjusting the correspondence between the number of steps of the stepping motor 33 and the position of the control cam 25 based on the offset amount, the control of adjusting the lubricating oil supply amount shown in the flowchart of FIG. 5 is performed.

In step P _12, when a predetermined learning condition is determined to be satisfied, for example, first-operation or a predetermined number of times from the time of the operation after the engine production (for example, 32
Steps), when the output value of the battery is equal to or higher than the set value (eg, 11 V) and the temperature of the engine cooling water is equal to or higher than the set value (eg, 10 ° C.)
The P _21, control for learning the position of the control cam 25 for actuation of the stepping motor 33 (the output voltage value of the position sensor 37) is performed. This learning control is performed following the initialization control for confirming the offset amount at the zero point as shown by a chain line in FIG. 7, and after the stepping motor 33 is returned to the zero position, the maximum operation position ( This is performed by reading the output voltage value of the position sensor 37 at each position while operating up to, for example, 60 steps). Then, according to this learning result, the stepping motor
The correspondence between the number of operation steps of 33 and the position of the control cam 25 is updated.

Further, in step P _19, the output voltage value of the position sensor 37 at the zero point of the stepping motor 33
If VP ₀ is larger than the voltage value VS ₄ corresponding to 4 steps, it is determined that the offset amount of the control cam 25 or the position sensor 37 with respect to the stepping motor 33 is excessive, and that there is some abnormality, and that step P Perform fail-safe control by ₂₂ . This control is, for example, for limiting fuel or limiting ignition.

If the vehicle is to be started during the above-described initialization operation, control is performed to cancel the initialization operation at the time of sudden start according to the flowchart of FIG.

This control is performed in parallel with the control of FIG.
After being P _31, the initialization operation is started at P _32, the target step number of the stepping motor 33 which is set according to the engine operating condition whether five steps or less is determined. The operation state in which the target number of steps is 5 is indicated by a line X in FIG.
When the load of the engine is increased in order to start the vehicle in the driving state indicated by, the line X of the five steps is exceeded in the direction of increasing the intake air amount.

Then, if not exceed this line X, according to step P ₃₃ to P _35, after completion of the initialization operation, the number of steps of the stepping motor 33 by using the offset amount VP ₀ obtained by the initialization operation Control cam 25 against
While adjusting the position of the lubricating oil supply.

On the other hand, when the above-mentioned line X is exceeded during the initialization operation, that is, when the target number of steps of the stepping motor 33 becomes larger than 5 steps by increasing the load of the engine, the initialization operation is performed at that time. the control section 10 ends, 'adopted, the offset amount V _P0' offset V _P0 of the control cam 25 with respect to the number of steps obtained stepping motor 33 by the initialization operation at the previous start-up in step P ₃₅ the slip in The correspondence between the stepping motor 33 and the operation amount of the control cam 25 is corrected.

As a result, even when the engine load rises during the initialization operation, an amount of lubricating oil corresponding to the operating state is immediately supplied. Also in this case, since the offset is corrected, the supply amount of the lubricating oil is adjusted with high accuracy.

(Effect of the Invention) As described above, according to the present invention, the amount of lubricating oil supplied to the engine is adjusted to an amount corresponding to the operating state by driving the oil amount adjusting means to the target position with the electric actuator. In the lubricating oil supply device for an engine configured to correct the offset at the reference position of the electric actuator and the oil amount adjusting means at the time of starting the engine, the vehicle is started during the offset correcting operation. To increase the engine load,
Since this correction operation is canceled, an amount of lubricating oil corresponding to the operation state is supplied without delay even at the time of sudden start and the like. Further, in this case, if the offset between the electric actuator and the oil amount adjusting means is corrected by the correction amount used at the time of the previous offset correction, the supply amount of the lubricating oil is adjusted with high accuracy.
As a result, the supply of the lubricating oil is delayed when the vehicle suddenly starts as described above, so that the abrasion and damage of the inner wall surface of the combustion chamber and the seal member slidably contacting the surface are reliably prevented.

[Brief description of the drawings]

1 to 9 show an embodiment of the present invention. 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 the present embodiment, FIG. 3 is an output characteristic diagram of a position sensor provided in the pump, and FIG. 4 is control of the supply device. 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 operation explanatory diagram of this initialization control,
FIG. 8 is a flowchart showing control at the time of sudden start, and FIG.
The figure is a map for sudden start determination used in this control. FIG. 10 is a schematic view showing a conventional lubricating oil supply device. 17 Lubricating oil supply device (measuring oil pump),
25 ... oil amount adjusting means (control cam), 33 ... electric actuator (stepping motor), 40 ... reference position correcting means, engine load rise detecting means, correcting operation canceling means, auxiliary correcting means (control unit).

Claims (2)

(57) [Claims] 1. An oil amount adjusting means for adjusting an amount of lubricating oil supplied to an engine, an electric actuator for driving the adjusting means, and operating the actuator so that an operating position of the adjusting means is a target position. A reference position correcting unit that corrects an offset of the actuator and the oil amount adjusting unit at a reference position, and a reference position correcting unit that operates during a predetermined correcting operation period in which the correcting unit operates. Engine load rise detecting means for detecting the rise of the engine load, and correcting operation canceling means for canceling the operation of the reference position correcting means when the detecting means detects that the engine load has risen during the period. A lubricating oil supply device for an engine, which is provided. An auxiliary correcting means for correcting the offset between the actuator and the oil amount adjusting means with the correction amount used in the previous correcting operation when the correcting operation by the reference position correcting means is canceled by the correcting operation canceling means. The lubricating oil supply device for an engine according to claim 1, wherein the lubrication oil supply device is provided.