JPH03217610A - Internal combustion engine valve operating state switching detection device - Google Patents

Abstract

PURPOSE:To prevent misjudgement by stopping changeover judgement of operating condition of an engine valve due to oil pressure detected values, when either of the condition of engine temperature under prescribed temperature or the condition of engine speed under prescribed rotating speed is realized at least. CONSTITUTION:A control means 86 is at least connected to either of a temperature detector 89 to detect engine temperature or a rotating speed detector 90 to detect engine speed. which at least either of the condition of engine temperature under the prescribed temperature or the condition of engine speed under the prescribed rotating speed is realized, changeover judgement of operating condition of intake valves VIA, VIB and exhaust valves VEA, VEB due to detected values of oil pressure detectors 87, 88 is stopped. Hereby, misjudgement due to insufficient oil pressure in a high speed condition detecting monitor oil passage 45 and a low speed condition detecting monitor oil passage 54 by high viscosity of oil or low engine speed is prevented.

Description

[Detailed Description of the Invention] A. Object of the Invention (1) Industrial Application Field The present invention provides a valve operating state switching means capable of switching the operating state of an engine valve, a control means for controlling the operation of the valve operating state switching means, and a valve operating state switching means. a monitor oil passage configured to change the oil pressure in response to switching of the operating state of the engine valve; and an oil pressure detection system that detects the oil pressure of the monitor oil passage and inputs the detected oil pressure to the control means in order to detect the switching of the operating state of the engine valve. The present invention relates to a valve operating state switching detection device for an internal combustion engine, including a valve operating state switching detection device for an internal combustion engine.

(2) Prior art Conventionally, such a device has been disclosed, for example, in Japanese Patent Application Laid-Open No. 63-14790.
This is already known from Publication No. 9 and the like.

(3) Problems to be Solved by the Invention By the way, in such a device, the valve operating state switching means switches the operating state of the engine valve in accordance with the detected value of the oil pressure detector that detects the oil pressure of the monitor oil passage. It is determined whether or not the switching is being performed normally, and when the control means determines that a switching abnormality has occurred, an alarm lamp or the like is used to notify that a switching abnormality has occurred.

However, when the engine temperature is low and the oil viscosity is high, or the engine speed is low and the oil pressure in the monitor oil passage is not high enough, if a switching abnormality is determined based on the oil pressure in the monitor oil passage, it is determined that the switching is normal. There is a risk that it may be incorrectly determined that something is abnormal even though it has been done.

In view of the above-mentioned circumstances, a first object of the present invention is to detect valve operation state switching of an internal combustion engine in a manner that prevents erroneous determination that switching is abnormal even when switching is performed normally. The purpose is to provide equipment.

Further, in the above-mentioned conventional device (Japanese Patent Application Laid-Open No. 63-147909), between a plurality of mutually adjacent driving members for driving the engine valve to open and close in accordance with the rotational operation of the cam, the mutually adjacent driving members Valve operation state switching means is provided having a connection switching member that is movable between a position where the connection is connected and a position where the connection is released, and communication with and disconnection from the monitor oil passage can be switched by moving the connection switching member. A circular opening is provided in the drive member, and when the opening is opened, the oil pressure in the monitor oil passage decreases, and when the opening is closed by the connecting switching member, the oil pressure in the monitor oil passage increases, so that the switching operation is normal. I am trying to determine whether or not it is being executed. However, since the opening is circular, the movement stroke of the connection switching member between the position where the opening is completely opened and the position where it is completely closed is relatively large, and therefore the oil pressure of the monitor oil passage changes. It cannot be said that the switching detection response is excellent.

In view of the above circumstances, a second object of the present invention is to provide a valve operating state switching detection device for an internal combustion engine that has improved switching detection responsiveness.

Furthermore, in the above-mentioned conventional system (Japanese Patent Application Laid-Open No. 147909/1983), the opening and closing of a single monitor oil passage is switched according to the movement of a plurality of connection switching members, that is, changes in the operating state of the engine valve. , to detect the operating state. Therefore, in order to reliably detect the switching of the operating state, a plurality of monitor oil passages are provided to exclusively detect the movement of the plurality of connected switching members, and the switching of the operating state is determined by these monitor oil passages. It is desirable to do so. However, if oil is constantly supplied from the oil supply source to each dedicated monitor oil path,
The amount of oil used increases.

In view of the above circumstances, a third object of the present invention is to provide a valve operating state switching detection device for an internal combustion engine that can reliably detect operating state switching while reducing the amount of oil used. .

B. Structure of the Invention (1) Means for Solving the Problems According to the first feature of the present invention, the control means includes a temperature detector for detecting the engine temperature, and a temperature sensor for detecting the engine temperature. At least one of the rotation speed detectors for detecting the rotation speed is connected, and the control means controls the hydraulic pressure when at least one of a state in which the engine temperature is below a predetermined temperature and a state in which the engine speed is below a predetermined speed is established. It is configured to stop determining whether to switch the operating state of the engine valve based on the detected value of the detector.

According to a second feature of the present invention, in order to achieve the above second object, there is a gap between the cam provided on the camshaft interlocked and connected to the crankshaft and the engine valve. Accordingly, a plurality of mutually adjacent driving members for driving the engine valve to open and close are provided so as to be relatively displaceable,
The valve operation state switching means has a connection switching member movable between a position where the mutually adjacent driving members are connected and a position where the connection is released, and is provided between each drive member, A slit-shaped opening extending in a direction perpendicular to the direction of movement of the member is provided in at least one of each driving member to switch communication/blocking with the monitor oil passage according to movement of the connection switching member.

Furthermore, in order to achieve the third object, according to a third feature of the present invention, a cam provided on a camshaft interlocked with and connected to a crankshaft. l! : A plurality of mutually adjacent drive members are interposed between the engine valve and the engine valve so as to be relatively displaceable for driving the engine valve to open and close according to the rotational operation of the cam, and the valve operation state switching means is A plurality of connection switching members movable between a position where the mutually adjacent drive members are connected and a position where the connection is released are provided between each drive member, and a plurality of connection switching members are provided between the drive members, and a plurality of connection switching members are selected from among the connection switching members. A plurality of monitor oil passages, which can be individually switched to open the engine valve in one operating state and close in another operating state, are connected to a single oil supply source through the switching valve. Connected.

(2) Effect According to the configuration of the first feature above, the operating state of the engine valve is switched when at least one of a state in which the engine temperature is below a predetermined temperature and a state in which the engine speed is below a predetermined speed is established. The determination is stopped, thereby preventing an erroneous determination caused by the fact that the oil pressure in the monitor oil passage is not sufficiently high due to high oil viscosity or low engine speed.

Further, according to the configuration of the second feature, since the opening provided in the drive member is in the shape of a slit extending in a direction perpendicular to the moving direction of the connection switching member, the opening is completely opened and the opening is completely opened. The movement stroke of the connection switching member between the position and the position where it is cut off becomes relatively small.

Furthermore, according to the configuration of the third feature, the operating state of each connection switching member, that is, the operating state of the engine valve can be reliably determined by the plurality of monitor oil passages each having a hydraulic pressure that individually corresponds to the operating state of the engine valve. Moreover, since the connection state between the oil supply source and each monitor oil line can be changed using the switching valve,
It is possible to reduce the amount of oil used.

(3) Examples Embodiments of the present invention will be described below with reference to the drawings.

First, in FIGS. 1 to 3, each cylinder in a DOHC multi-cylinder internal combustion engine has a pair of intake valve ports 3A, 3. are provided, and their exhalation valve ports 3A. A pair of intake valves as engine valves that can open and close 3B individually■I A+
■l B is supported by the cylinder head 1 so that it can be opened and closed. Each intake valve ■IA+ ■II is connected to a camshaft 4 which is rotationally driven by the engine's crankshaft (not shown) at a reduction ratio of 172, and a low-speed cam that is integrally provided on the camshaft 4. 5.5, a high-speed cam 6, a rocker shaft 7 fixedly arranged parallel to the camshaft 4, a first drive rocker arm 8 and a second drive rocker arm 9 as drive members pivotally supported by the rocker shaft 7. and a free rocker arm 10, each rocker arm 8,
9. ]. The intake valve is driven to open and close by an intake valve-side valve operating device 22+ that includes a valve operating state switching means 11 provided between the intake valve and the valve operating state switching means 11.

The camshaft 4 is disposed in the cylinder above the throat 1 in parallel to the arrangement direction of each shaft so as to be freely rotatable around an axis. Further, a low speed cam 5.5 having a shape suitable for low speed operation of the engine is integrated into the camshaft 4 at a position corresponding to each intake valve VIA+Vll, and a high speed cam 6 having a shape corresponding to high speed operation of the engine is integrated. It is integrated into the camshaft 4 between both low-speed cams 5.5. On the other hand, the rocker shaft 7 is fixedly disposed below the camshaft 4 and has an axis parallel to the camshaft 4.

The rocker shaft 7 includes a first driving port arm 8 that is interlocked and connected to one intake valve 1A, a second driving port arm 9 that is interlocked and connected to the other intake valve Vll+, and a first and second driving port arm 9 that is interlocked and connected to the other intake valve A free rocker arm 10 disposed between the two drive rocker arms 8 and 9 is pivoted adjacent to each other.

Cam slippers 13 and 14 are provided at the top of the first and second drive rocker arms 8 and 9 to slide on the low-speed cams 5 and 5, respectively, and cam slippers 15 and 15 are provided at the top of the free rocker arm IO to slide on the high-speed cam 6. is provided.

Tabet screws 16 are respectively screwed into the first and second drive rocker arms 8.9 so as to be movable forward and backward.

On the other hand, each intake valve vTA+ (IB) is resiliently biased upward, that is, in the valve closing direction, by a valve spring 17 compressed between it and the cylinder head l, and each of the tabet screws 1
6 corresponds to the intake valve■, ^. ■、．． is abutted against the upper end of the As a result, both drive rocker arms 8 and 9 are connected to the intake valve VIA.
They will be individually interlocked and connected to IVlm.

Furthermore, the free rocker arm 10 is resiliently biased by a lost motion mechanism 18 interposed between the free rocker arm 10 and the cylinder head 1 in a direction to bring the cam slipper 15 into sliding contact with the high-speed gear 56. This lost motion mechanism 18 is slidably fitted into a bottomed cylindrical guide member 19 which is fitted into the cylinder with its closed end facing the throat 1 and into the guide member 19-. and a first and second spring 21 interposed in series between the piston 20 and the guide member 19 to bias the piston 20 toward the free rocker arm 10.
, 22, and the first and second springs 21, 22 are set to have different spring constants.

In FIG. 4, the valve operation state switching means 11 includes a connection switching piston 25 as a first connection switching member capable of connecting the first drive rocker arm 8 and the free opening rocker arm 10.
, a cylindrical connection switching pin 26 as a second connection switching member capable of connecting the free rocker arm 10 and the second drive rocker arm 9, and a second connection switching pin 26 for regulating the movement of the connection switching piston 25 and the connection switching pin 26. A bottomed cylindrical stopper 27 as a third connection switching member fitted into the drive rocker arm 9, and a return spring 28 that urges the connection switching piston 25, the connection switching pin 26, and the stopper 27 toward the connection release side. Be prepared.

The first drive rocker arm 8 has a bottomed first guide hole 29 open to the free opening rocker arm 10 side.
The connection switching piston 25 is bored parallel to the
A hydraulic chamber 32 is defined between one end of the connection switching piston 25 and the closed end of the first guide hole 29 .

A guide hole 30 corresponding to the first guide hole 29 is bored in the free rocker arm 10 across both sides of the rocker shaft parallel to each other, and a connection whose one end abuts the other end of the connection switching piston 25 is provided. The switching bin 26 is the guide hole 3
0 is slidably fitted.

In the second drive rocker arm 9, a bottomed second guide hole 3l corresponding to the guide hole 30 is opened to the free rocker arm 10 side and is bored parallel to the Ronca shaft 7,
A bottomed cylindrical stopper 27 whose closed end abuts the other end of the connection switching bin 26 is slidably fitted into the second guide hole 31 . The return spring 28 is compressed between the closed end of the second guide hole 31 and the closed end of the stopper 27, and the spring force of the return spring 28 causes the connection switching piston 25, connection switching pin 26, and The stopper 27 is urged toward the hydraulic chamber 32 side. Furthermore, a release hole 33 for removing air and oil is formed at the closed end of the second guide hole 31, and a continuous hole 34 communicating with the connection switching pin 27 is formed at the closed end of the stomper 27.

In this valve operating state switching means 11, when the oil pressure in the hydraulic chamber 32 is low, the return spring 28 is turned off as shown in FIG.
Due to the spring force, the connection switching piston 25 moves to the connection switching pin 2.
6 is in a position corresponding to between the first driving arm 8 and the free opening arm 10, and the connection switching pin 26 makes the contact surface with the stone bar 27 correspond to the opening between the first driving arm 8 and the free opening arm 10.
and the second drive rocker arm 9, the connection state of each rocker arm 8, 9, 10 is released, and each rocker arm 8-10 is in a state where it can be relatively displaced. Therefore, both intake valves VIA+V18 are driven to open and close by the first and second drive rocker arms 8.9, which are swing-driven by the low-speed cam 5.5. Further, when the oil pressure in the hydraulic chamber 32 increases, the connection switching piston 25 fits into the guide hole 30 and the connection switching pin 26 fits into the second guide hole 31, as shown in FIG. 10 are connected. Therefore, the first and second drive port arm 8.9 swings together with the free port swing arm 10 which is swing-driven by the high-speed cam 6, and both intake valves V.
The IAI VIB is driven to open and close by the high speed cam 6.

Incidentally, the inside of the rocker shaft 7 is partitioned by a substantially T-shaped partition wall 35 into an oil supply path 36, an oil path 37 for high speed state detection, and an oil path 38 for low speed state detection. The partition wall 35 is constructed by inserting a substantially T-shaped separator into the hollow cylindrical rocker shaft 7, and welding or gluing the separator and the inner surface of the rocker shaft 7 by electron beam welding or the like. Alternatively, the separator may be formed by press-fitting the separator into the rocker shaft 7, or the hollow shaft and the separator may be integrally pultruded to form the partition wall 35 inside the rocker shaft 7. You can do it like this. Furthermore, the portion of the substantially T-shaped partition wall 35 that spans the diameter of the Ronca shaft 7 is arranged so that it coincides with the direction in which the Ronca shaft 7 receives the maximum load due to the rocking motion of each rocker arm 8, 9, 10.
Thereby, the rigidity of the rocker shaft 7 can be improved, and the outer diameter of the rocker shaft 7 can be made relatively small.

The oil supply passage 36 is communicated with the hydraulic chamber 32 of the valve operating state switching means 11 in each intake valve side valve operating device 121. That is, the first drive rocker arm 8 is provided with an annular groove 39 that surrounds the rotor shaft 7 and an oil passage 40 that communicates the annular groove 39 with the hydraulic chamber 32. A communication hole 41 communicating with 39 is bored. Therefore, regardless of the swinging state of the first drive rocker arm 8, the oil supply path 36 is connected to the hydraulic chamber 3.
2 is in constant communication.

An annular recess 42 is provided on the outer periphery of the stopper 27 in the valve operating state switching means 11 . On the other hand, the portion of the second drive port/7 arm 9 facing the sliding contact portion with the low speed cam 5, that is, the upper part of the second drive port/7 arm 9 and the cam sill 14.
is provided with a slint-shaped opening 43 that is long in the direction perpendicular to the moving direction of the stopper 27 and communicates the inner surface of the second guide hole 31 with the outside, and this opening 43 becomes narrower as it becomes deeper. An oil sump 44 is formed as follows.

Moreover, the opening 43 communicates with the annular recess 42 when the stopper 27 is in the disconnection position as shown in FIG.
As shown in FIG. 5, it is arranged so as to be closed by the stopper 27 when in the connected position.

A high-speed state detection monitor oil passage 45 is formed between the high-speed state detection oil passage 37 in the rocker shaft 7 and the opening 43 and is switched between communication and interruption by the stopper 27 . That is, the second opening arm 9 is provided with an annular groove 46 surrounding the Ronca shaft 7 and a communication path 47 that communicates the annular groove 46 with the annular recess 42 regardless of the movement position of the stopper 27. is a communication hole 4 that communicates the high-speed state detection oil passage 37 with the annular groove 46;
8 is drilled, and a communication hole 48 is connected from the oil passage 37 for high-speed state detection.
, a high-speed state detection monitor oil passage 45 that reaches the opening 43 via the annular groove 46, the communication path 47, and the annular recess 42 is formed. This high-speed state detection monitor oil passage 45 is connected to the state where the stop collar 27 is in the connected position, that is, when both intake valves ■IA+
■While the stopper 27 is in a closed state when Il+ is in a high-speed operating state, the stopper 27 is opened to the outside from the opening 43 when both intake valves VIA and VlB are in a low-speed operating state. become.

An annular recess 51 is provided on the outer periphery of the connection switching bin 26 in the valve operating state switching means 11 . On the other hand, the portion of the free rocker arm 10 facing the sliding contact with the high-speed cam 6, that is, the upper part of the free rocker arm 10 and the cam slipper l5, has a long slit-shaped opening in a direction perpendicular to the moving direction of the connection switching bin 26. 52 is provided to communicate the inner surface of the guide hole 30 with the outside, and this opening 52 forms an oil reservoir 53 that becomes narrower as it gets deeper.

Moreover, the opening 52 is opened to the connection changeover pin 26 when the connection changeover pin 26 is in the disconnection position as shown in FIG.
and is arranged so as to communicate with the annular recess 5l when in the connected position as shown in FIG.

Between the low-speed state detection oil passage 38 in the rocker shaft 7 and the opening 51, there is a low-speed state detection monitor oil passage 54 which is switched between communication and disconnection by the connection switching bin 26.
is formed. That is, the free opening rocker arm 10 has an annular groove 55 surrounding the rocker shaft 7 and an annular groove 51 that connects the annular groove 55 to the annular recess 51 regardless of the movement position of the connection switching pin 26.
A communication passage 56 for communicating with the annular groove 55 is provided in the ronoka shaft 7, and a communication hole 57 for communicating the low speed state detection oil passage 38 with the annular groove 55 is provided. Groove 55, communication path 56 and annular recess 5
1 and reaching the opening 52 through the monitor oil passage 5 for low speed state detection.
4 is formed. This low-speed state detection monitor oil passage 54 is open to the outside from the opening 51 when the connection switching pin 26 is in the connected position, that is, when both intake valves VIA+1ll are in a high-speed operation state. , the connection switching pin 26 is in the closed state when the connection switching pin 26 is in the disconnection position, that is, when both the intake valves vIA+'II are in a low-speed operation state.

In FIG. 6, an exhaust valve side valve train 12E for opening and closing the exhaust valves VIA and Vyl as engine valves, which are arranged in pairs in each case, is basically the same as the intake valve side valve train 121. They have the same configuration, and the parts related to both valve gears 121 and 12E, which will be described next, are basically the same, so below, the oil supply system of the intake valve side valve gear 1121 will be described, and a description of the oil supply system of the exhaust valve side valve operating device 121 will be omitted.

The oil supply source 62 includes an oil pan 63 and an oil pan 63.
The oil pump 64 includes an oil bomb 64 for pumping oil from the oil pump 64, and a relief valve 65 connected to a discharge port of the oil pump 64.

This oil supply source 62 is connected to an oil gallery 68 via an oil filter 66 and an oil cooler 67.

The oil gallery 68 has a filter 6 installed in the middle thereof.
The oil that has passed through 9 is switched to high pressure and low pressure to supply oil to the oil supply path 36.
A control valve 70 is connected for supplying the water. Further, an oil passage 72 that branches from the oil gallery 68 on the upstream side of the filter 69 and has a throttle 71 in the middle is connected to each of the long arm arms 8 to 10 in the pilot valve device 121 of each cylinder, the low speed cam 5.5 and It is connected to a lubricating oil passage 73 for guiding lubricating oil to the sliding contact portion with the high speed cam 6. Further, the oil passage 73 is connected to a plurality of lubricating oil passages 74 for guiding lubricating oil to the journal portion of the camshaft 4.

The oil passage 72 is connected to the input boat 78 of the switching valve 75, and is connected to the high-speed state detection monitor oil passage 45 via the first output port 79 of the switching valve 75 and the throttle 76, and the second output boat 80 is connected to the high-speed state detection monitor oil passage 45. It is connected to the low speed state detection monitor oil passage 54 via the throttle 77 .

This switching valve 75 includes a housing 8 having a predetermined input boat 78, a first output port 79, and a second output port 80.
1, a position where the input port 78 and the first output port 79 are communicated, and a position where the input port 78 and the second output port 8 are connected.
The spool 82 is slidable between the spool 82 and the position where it communicates with the
are fitted together. That is, the spool 82 forms a pilot hydraulic chamber 83 that passes through the oil supply path 36 between its one end and the housing 8l, and forms a spring chamber 84 open to the atmosphere between the other end and the housing 81. A return spring 85 is slidably fitted into the spring chamber 81 and is housed in the spring chamber 84 for biasing the subur 82 in a direction to contract the volume of the pilot hydraulic chamber 83 .

In this switching valve 75, when the intake valve side valve gear N12 is brought into a high-speed operating state, that is, when the oil pressure in the oil supply passage 36 is increased by the control valve 70, the spool 82 resists the spring force of the return spring 85. When moving the input boat 78 to a position where it communicates with the first output boat 79 and placing the intake valve-side valve operating device 121 in a low-speed operating state, that is, when the control valve 7
When the oil pressure in the oil supply path 36 is lowered by 0, the subur 82 is moved by the spring force of the return spring 85 to a position where the input boat 78 is communicated with the second output boat 80 . Therefore, in the high-speed operating state, oil from the oil supply source 62 is supplied to the high-speed state detection monitor oil passage 45 via the throttle 74.76, and in the low-speed operating state, the oil from the oil supply source 62 is supplied to the monitor oil passage 45 through the throttle 71.7. Monitor oil passage 54 for low speed state detection via
will be supplied to

The operation of the control valve 70 is controlled by a control means 86, which controls the operation of the control valve 70 between a high speed operation state and a low speed operation state in accordance with the input of an index representative of the operating state of the engine. Control by switching. Moreover, the control means 86 includes a high-speed state oil pressure detector 87 that detects the oil pressure of the monitor oil path 45 for high-speed state detection, and a low-speed state oil pressure detector 88 that detects the oil pressure of the monitor oil path 54 for low-speed state detection.
The control means 86 controls the intake valve side valve operating system 12 according to the detected values of these oil pressure detectors 87 and 88.
．． It is determined whether or not the operation of the valve operation state switching means 11 is normal. That is, when the operation of the 1,000-stage valve operation state switching 1l is normal, the high speed state detection monitor oil passage 45 is closed during high speed operation, so the oil supply source 62 is closed.
The empty oil is supplied through the switching valve 75 and has a relatively high pressure, whereas the low speed state detection monitor oil path 5
4 is open to the outside and connected to the oil supply source 6 by a switching valve 75.
2, the pressure is at atmospheric pressure.During low-speed operation, the monitor oil passage 54 for low-speed state detection is closed, so oil from the oil supply source 62 is supplied via the switching valve 75. Although the pressure is relatively high, the high-speed state detection monitor oil passage 45 is open to the outside and the switching valve 7
5, it is cut off from the oil supply source 62, so it is at atmospheric pressure, and when the detected pressures of both oil pressure detectors 87 and 88 are as shown in Table 1 below, the switching operation is normal. If the switching operation is different from the state shown in Table 1, it can be determined that the switching operation is abnormal. When it is determined that the switching operation is abnormal, the control means 86 issues a notification using an alarm lamp or the like.

Table 1 By the way, the control means 86 is connected to a temperature detector 89 for detecting the engine temperature TE and a rotation speed detector 90 for detecting the engine speed N1. T, is below a predetermined temperature and the engine speed N
, is below a predetermined number of rotations, the operation state switching determination based on the detected values of both oil pressure detectors 87 and 88 is stopped.

Next, the operation of this embodiment will be explained. The control means 86 controls the operation of the control valve 70 according to the operating state of the engine, so that the valve operating state switching means 11 switches.
When the engine is running at high speed, the rocker arms 8 to 10 are integrally connected, and both intake valves ■IA + ■IB are driven to open and close at opening/closing timing and lift amount according to the shape of the high-speed cam 6, and when the engine is running at low speed, the rocker arms 8 to 10 are connected integrally. Now, each rocker arm 8~
A relative displacement of 10 is allowed and VIA. Vll+ is driven to open and close at opening and closing timing and lift amount according to the shape of the low speed cam 5.5.

By the way, the detected values of both oil pressure detectors 87 and 88 change as shown in Table 1 above depending on the high speed operating state of the engine and the low speed operating state of the engine, so the detected values of both oil pressure detectors 87 and 88 In combination, the control means 86 controls the operation of the connection switching bin 26 and the stopper 27, that is, the valve operation state switching means 1.
It can be determined whether or not the switching operation of No. 1 is normal. Therefore, even if one of the connection switching pin 26 and the stopper 27 switches normally, the other may operate abnormally, and the high speed state detection monitor oil passage 45 corresponding to the stopper 27 and the connection switching By detecting the hydraulic pressures of the low-speed state detection monitor oil passages 54 corresponding to the pins 26, it becomes possible to more reliably detect the switching state of the valve operating state switching l1.

Moreover, the state of oil supply from the oil supply source 62 to both monitor oil passages 45, 54 is controlled by a switching valve 75, so that oil is supplied to the closed side of both monitor oil passages 45, 54, and is opened to the outside. Since the oil supply is cut off to the side that is exposed to oil, the amount of oil supplied from a single oil supply source 62 can be kept to the minimum necessary, and the enlargement of the oil supply source 62 can be avoided. be able to.

Further, an opening 52, which is the end of the monitor oil passage 54 for detecting a low speed state, is located facing the sliding contact portion of the free lock force arm 10 with the high speed cam 6, which is subjected to a relatively large load when the engine is operating at high speed. Oil flows out from the opening 52 into the oil sump 53, which is provided and is open when the engine is running at high speed, and is connected to the low-speed cam 5 of the second drive rocker arm 9, which is subjected to a relatively large load when the engine is running at low speed. An opening 43, which is the end of a high-speed state detection monitor oil passage 45, is provided facing the sliding contact part.
When the engine is operating at low speed, oil flows out from the open opening 43 into the oil sump 44, so lubricating oil should be supplied from the lubricating oil passage 73 to the sliding contact areas between each rocker arm 8 to 9 and each cam 5, 56. This can contribute to miniaturization of the hydraulic pressure supply source 62.

Since the openings 43 and 52 are formed in the shape of slits perpendicular to the moving direction of the striker 27 and the connection switching pin 26, the opening area is smaller than that of the conventional openings, which are formed circularly by a drill or the like. If they are the same, then they. The movement stroke of the stopper 27 and the connection switching bin 26 between the position where the opening 4352 is completely opened and the position where the opening 4352 is completely closed can be reduced, and therefore, when the valve operation state switching means 11 is switched, The oil pressure changes in both monitor oil passages 45 and 54 are quick, and switching detection responsiveness can be improved.

Further, the control means 86 determines the operation switching state when at least one of the engine temperature TE detected by the temperature detector 89 and the engine rotation speed N0 detected by the rotation speed detector 90 is below a predetermined value. This avoids switching judgment when the engine temperature TE is low and the oil viscosity is high, or when the engine speed NE is low and the oil pressure in both monitor oil passages 45 and 54 is not high enough. To prevent erroneous determination that the switching operation is abnormal even though it is normal due to the oil pressure being too low or the oil pressure in both monitor oil passages 45 and 54 not increasing sufficiently. In the above embodiment, the control means 8
6, the detection values of the temperature detector 89 and the rotation speed detector 90 are input, but the switching determination may be stopped based on the detection value of only one of them.

C. Effects of the Invention As described above, according to the first feature of the present invention, when at least one of the state in which the engine temperature is below a predetermined temperature and the state in which the engine speed is below a predetermined speed is established, the engine valve is activated. The operation state switching judgment is stopped, and erroneous judgments due to the oil pressure in the monitor oil passage not being high enough due to high oil viscosity or low engine speed are reliably prevented. .

According to the second feature of the present invention, since the opening is in the form of a slit extending in a direction perpendicular to the direction of movement of the connection switching member, the opening has a position where it is completely open and a position where it is completely blocked. By making the movement stroke of the connection switching member between the two parts relatively small, detection responsiveness can be improved.

Furthermore, according to the third feature of the present invention, the operating states of the plurality of connection switching members can be respectively detected by the plurality of monitor oil passages, thereby reliably determining the operating state of the valve operating state switching means, Since the connection state between the oil supply source and each monitor oil passage is switched by the switching valve, the amount of oil used can be reduced and the oil supply source can be downsized.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a plan view of the intake valve side valve operating device, FIG. Figure 4 is a sectional view taken along the line IV--IV in Figure 2 in a low-speed operating state, Figure 5 is a sectional view corresponding to Figure 4 in a high-speed operating state, and Figure 6 is a sectional view corresponding to Figure 4 in a high-speed operating state. It is a diagram showing the oil supply system related to the valve device. 4...Camshaft, 5...Low speed cam, 6...
High-speed cam, 8... First drive rocker arm as a drive member, 9... Second drive rocker arm as a drive member, 10... Free rocker arm as a drive member, 1
DESCRIPTION OF SYMBOLS 1... Valve operation, operating state switching means, 25... Connection switching piston as a connection switching member, 26... Connection switching pin as a connection switching member, 27... Stopper as a connection switching member, 43 .52... opening, 44.53...
・Oil sump, 45... Monitor oil path for high-speed state detection, 54.
・・Monitor oil passage for low speed state detection, 62 ・・oil supply source,
75...Switching valve, 86...Control means, 87.88.
...Oil pressure detector, 89...Temperature detector, 90...Rotation speed detection ■I^ Vlm...Intake valve as inter-machine valve, ■E^ ■ ■...Exhaust valve as engine valve Patent Applicant Honda Motor Co., Ltd. Agent Akira Niki 1 Figure 3 Figure 4

Claims (4)

[Claims] (1) A valve operating state switching means capable of switching the operating state of the engine valve, a control means for controlling the operation of the valve operating state switching means, and a hydraulic pressure according to the switching of the operating state of the engine valve by the valve operating state switching means. Detection of switching of valve operating state of an internal combustion engine, comprising a monitor oil passage configured to change the operating state of the engine valve, and an oil pressure detector that detects the oil pressure of the monitor oil passage and inputs the detected oil pressure to a control means to detect switching of the operating state of the engine valve. In the apparatus, a control means (86)
is connected to at least one of a temperature detector (89) for detecting the engine temperature and a rotation speed detector (90) for detecting the engine speed, and the control means (86) is configured to detect when the engine temperature is below a predetermined temperature. The engine valve (V_I_
A, V_I_B, V_E_A, V_E_B) valve operating state switching detection device for an internal combustion engine, characterized in that it is configured to stop determining the operating state switching of the valves (A, V_I_B, V_E_A, V_E_B). (2) A valve operating state switching means capable of switching the operating state of the engine valve, a control means for controlling the operation of the valve operating state switching means, and a hydraulic pressure according to the switching of the operating state of the engine valve by the valve operating state switching means. Detection of switching of valve operating state of an internal combustion engine, comprising a monitor oil passage configured to change the operating state of the engine valve, and an oil pressure detector that detects the oil pressure of the monitor oil passage and inputs the detected oil pressure to a control means to detect switching of the operating state of the engine valve. In the device, cams (5, 6) provided on a camshaft (4) interlocked and connected to the crankshaft and engine valves (V_I_A, V_I_B, V_
E_A, V_E_B), engine valves (V_I_A, V_I_B, V_
A plurality of mutually adjacent driving members (8, 9, 10) for driving the opening and closing of E_A, V_E_B) are disposed so as to be relatively displaceable, and the valve operating state switching means (11) Each drive member (8, 9, 10) has a connection switching member (25, 26, 27) movable between a position where the drive member (8, 9, 10) is connected and a position where the connection is released.
, 10), and the connection switching member (25, 26
, 27), the slit-shaped openings (43, 52) extending in a direction perpendicular to the movement direction of the connection switching members (25, 26,
Valve operation for an internal combustion engine, characterized in that it is provided in at least one of each driving member (8, 9, 10) to switch communication/blocking with a monitor oil passage (45, 54) according to movement of the valve (27). State switching detection device. (3) The openings (43, 52) are formed in the drive member (9, 10) so as to face the sliding contact portion with the cam (5, 6) and form an oil reservoir (44, 53). The second (2nd)
) Valve operating state switching detection device for an internal combustion engine as described in item 2. (4) Valve operating state switching means capable of switching the operating state of the engine valve, control means for controlling the operation of the valve operating state switching means, and hydraulic pressure according to switching of the operating state of the engine valve by the valve operating state switching means. Detection of switching of valve operating state of an internal combustion engine, comprising a monitor oil passage configured to change the operating state of the engine valve, and an oil pressure detector that detects the oil pressure of the monitor oil passage and inputs the detected oil pressure to a control means to detect switching of the operating state of the engine valve. In the device, cams (5, 6) provided on a camshaft (4) interlocked and connected to the crankshaft and engine valves (V_I_A, V_I_B, V_
E_A, V_E_B), engine valves (V_I_A, V_I_B, V_
A plurality of mutually adjacent driving members (8, 9, 10) for driving the opening and closing of E_A, V_E_A) are disposed so as to be relatively displaceable, and the valve operating state switching means (11) is arranged such that the valve operating state switching means (11) Each drive member (8, 9, 10) has a plurality of connection switching members (25, 26, 27) movable between a position where the drive members (8, 9, 10) are connected and a position where the connection is released.
8, 9, 10), and the connection switching member (25
, 26, 27) selected from a plurality of connection switching members (
26, 27), the engine valves (V_I_A, V_I_B,
A plurality of monitor oil passages (45, 54) that can be individually switched to be opened in one operating state and closed in another operating state of V_E_A, V_E_A) are connected to a single oil passage via a switching valve (75). A valve operating state switching detection device for an internal combustion engine, characterized in that it is connected to a supply source (62).