JPH0311122A - Electromagnetic valve controller for engine - Google Patents

Abstract

PURPOSE:To increase the intake/exhaust efficiency in low loading by opening/ closing-operating one exhaust valve and maintaining the other in closed state, in correspondence with the revolution speed signal less than a prescribed value and the load signal by a solenoid valve driving device. CONSTITUTION:A controller 15 allows electric current to flow in the stator coil 20 and the movable coil 24 of an electromagnetic valve driving device in correspondence with each detection signal, and energizes an electromagnet and drives exhaust valves 1 and 2. When the load detection value of an engine 13 which is detected by a load sensor 31 is less than a prescribed set load and the detection value of the revolution speed of the engine 13 which is detected by a revolution speed sensor 14 is less than a prescribed set revolution speed, one exhaust valve 1 is opening/closing-operated, and the other exhaust valve 2 is maintained in closed state. Therefore, the exhaust gas flow is provided with inertial force by maintaining certain gas pressure in the cylinder of the engine 13 in low loaded state. Therefore, exhaust can be carried out smoothly by the inertial force, and the suction efficiency can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electromagnetic valve control device for an engine that opens and closes intake and exhaust valves using electromagnetic force.

[Conventional technology]

Conventionally, an engine having four valves is disclosed in Japanese Patent Publication No. 63-35807, for example. This multi-intake valve type engine has two intake passages to the combustion chamber, and these intake passages are connected by a passage provided with a control valve.When the engine speed is low or the load is low, the control valve is closed and one of the intake passages is connected. This attempts to increase the output by increasing the flow rate of intake air from the intake passage.

In addition, the opening and closing operations of engine intake and exhaust valves have long been driven by an 8g mechanical valve mechanism such as a camshaft, but instead of this mechanical valve mechanism, electric Proposals to operate the valve using a mechanism have been proposed, for example, in Japanese Patent Application Laid-open No. 58-183305 and Japanese Patent Application Laid-open No. 61-7.
It is disclosed in Japanese Patent No. 6713.

(Problem to be solved by the invention) By the way, Fig. 2 shows the P-V of the engine operating cycle.
A diagram is shown. As shown in the p-v diagram, work step a in the cycle progresses, the working gas is produced a little later, and the exhaust valve is opened at point 0, but the cylinder internal pressure at point O when the exhaust valve opens is is still quite high, so immediately after the exhaust valve opens, a blowdown phenomenon occurs in which the working gas is ejected into the exhaust pipe at the speed of sound (in the figure, the symbol BD
When this blowdown phenomenon occurs, the exhaust gas blows out immediately after the exhaust valve is opened, creating the effect of a pressure drop inside the cylinder.Then, the exhaust process progresses, and the exhaust gas at the end of the exhaust process Pulled by the inertia of the flow, the gas inside the cylinder has the effect of being exhausted. Therefore, when the intake valve opens and moves to intake stroke C, the intake air is pulled into the cylinder by the inertial force of the exhaust gas flow.8Then, the exhaust valve closes, and the intake air is drawn into the cylinder. is inhaled, and the intake process C ends. Therefore, the amount of intake air that was pulled into the cylinder by the inertial force of the exhaust gas at the beginning of the intake stroke was drawn into the cylinder in an amount larger than that of the intake air.

The above two effects are that when the engine is under high load,
This occurs noticeably because the gas pressure inside the cylinder is high, but it does not occur very effectively when the load is low, and if the two exhaust valves are opened, the amount that can be exhausted becomes too large. That is, P
As shown in Figure 3, which is a -V diagram, when the engine is at full load, that is, at high load (indicated by the solid line in the diagram), the gas pressure in the cylinder is high, so the two exhaust valves are closed. Point 0
If the exhaust gas is opened at the same time, a blowdown phenomenon BD will occur, and if the exhaust gas is not blown out all at once at a speed that exceeds the critical speed point, the exhaust pipe will suffer from back pressure, interference from pressure waves in the exhaust pipe, etc. pressure increases,
Negative work (area A in the figure) in the exhaust process increases. On the other hand, when the engine is at partial load or low load (indicated by the dotted line p in the figure), the gas pressure in the cylinder is not that high and the amount of exhaust gas is small.
In this state of low exhaust gas, turn the two exhaust valves to 0.
When the cylinder is opened, there is no exhaust gas to be blown out, and the blowdown phenomenon does not occur noticeably. Therefore, the exhaust gas is not blown out all at once and no inertial force is generated, and it remains in the cylinder.
During the exhaust process, the exhaust gas is not pulled by inertial force and exhausted, but is exhausted along the base BP of the back pressure and is affected by the back pressure. Therefore, the exhaust gas in the cylinder remains without being exhausted, and the pumping work, that is, the negative work increases, and good results are not necessarily obtained.

In addition, regarding the proposal in the above publication to use an electromagnetic mechanism to operate the intake and exhaust valves, the timing of opening and closing the valves is controlled electrically, but the opening and closing of the four valves is controlled in accordance with the load and rotation of the engine. It has not been taken into account.

The purpose of this invention is to solve the above problems,
Focusing on the fact that the opening and closing operations of each intake and exhaust valve consisting of four pulps can be controlled by the tvA pulp drive device, the opening and closing operations can be performed independently of the crankshaft. When the gas pressure inside the cylinder is high and the load is high, the pressure inside the cylinder is significantly lowered due to blowdown, and the gas inside the cylinder is exhausted all at once by the inertia of the exhaust gas flow, and the inertia of the exhaust gas is Multiple exhaust valves are opened in order to draw intake air into the cylinder by the action of force, whereas at low loads, one exhaust valve is opened and the other exhaust valve is kept closed, and the cylinder is closed. While maintaining the gas pressure inside the cylinder to a certain extent, the exhaust gas flow has inertia force, and the exhaust process is performed in the area below the back pressure base, and the inertia force of the exhaust gas flow allows the gas inside the cylinder to flow smoothly. To provide an electromagnetic valve control device for an engine which improves intake efficiency in an intake stroke by exhausting air and sucking intake air into a cylinder by the action of inertia of exhaust gas when an intake valve is subsequently opened.

[Means to solve the problem]

In order to achieve the above object, the present invention is configured as follows. That is, in this invention, two exhaust valves are
TF that opens and closes using magnetic force! In a one-valve control device, each detecting means detects the rotation speed and load state of the engine, and a rotation speed signal of a predetermined or higher value from each of the detection means and a load signal of a predetermined value or higher determined in response to the rotation speed signal. a controller that opens and closes both of the exhaust valves in response, and opens and closes one of the exhaust valves and maintains the other in a closed state in response to a rotational speed signal and a load signal other than the above. The present invention relates to an electromagnetic valve control device for an engine.

[Effect]

The engine IIT magnetic valve control device according to the present invention includes:
It is constructed as described above and operates as follows.

That is, the electromagnetic valve control device of this engine opens and closes two exhaust valves in response to a load signal of a predetermined level or higher, that is, a high load signal of the engine, and controls the effect of the pressure drop in the cylinder due to blowdown and the exhaust gas flow. The gas in the cylinder is exhausted all at once by the inertial force of the cylinder, improving the intake efficiency in the subsequent intake stroke, and one of the exhaust valves is opened and closed in response to a load signal other than the above, that is, a low load signal, and the other is opened and closed. is maintained in the closed state to maintain the gas pressure in the cylinder and give inertia to the exhaust gas flow, and the gas in the cylinder is smoothly exhausted by this inertia, and the intake valve is opened during the subsequent intake stroke. 31 Intake air is taken in by the action of +M force to improve the intake efficiency in the intake process.

〔Example〕

Embodiments of the electromagnetic valve control device for an engine according to the present invention will be described below with reference to the drawings.

In FIG. 1, an engine cylinder and intake/exhaust boat having four valves is shown for incorporating an engine electromagnetic valve control system according to the present invention. Four boats are formed in the cylinder head 3 of this cylinder so that four intake and exhaust valves can be installed therein.

That is, two of the four boats are exhaust boats 4.5 and the other two are intake boats 8.9. The exhaust port 4 is provided with an exhaust valve 1 and communicated with an exhaust gas passage 6, and the exhaust port 5 is provided with an exhaust valve 2 and communicated with an exhaust gas passage 7. Furthermore, an intake valve 18 is disposed on the intake boat 8, and an intake passage 1 is provided with an intake valve 18.
Further, an intake valve 19 is disposed in the intake boat 9, and an intake passage 11 is communicated with the intake boat 9.

Next, the 11-magnetic valve control system for this engine.
An example of an electromagnetic valve driving device that can incorporate r Ml will be described with reference to FIG. As shown in FIG. 5, this electromagnetic valve drive device is built into the engine 13, and the main parts of the 1i magnetic valve drive device are conceptually shown taken out from the engine 13. .

A rotation sensor 14 is provided to the output shaft of the engine 13 to detect the engine rotation speed. This detected value of the engine rotation speed, that is, the rotation signal, is input to the controller 15. The exhaust valves 1 and 2 are made of ceramic material,
It is guided by a valve guide 16 fixed to the cylinder head 3 and is arranged to be slidable in the vertical direction.

In addition, although only the exhaust valve 1.2 is illustrated in FIG. 5, the tTIfi valve drive device that can incorporate the electromagnetic valve control device of the four-valve engine also applies to each intake valve 18.19. Similarly t
A fuel injection nozzle 12 is arranged in the intake passage 10.11, and a flow rate sensor 30 is provided to detect the intake flow rate. A fuel injection device 21 that controls fuel supplied to the engine 13 is an injection nozzle 1
The injection nozzle 2 penetrates into the intake passage 10.11 from the upper part of the cylinder head 3, and the fuel injected from the nozzle hole is introduced into the cylinder. This fuel injection device 21 is controlled by a command from the controller 15 to inject a predetermined amount of fuel.

Exhaust valve 1 by raising or lowering exhaust valve 1.2
The exhaust boats 4 and 5 are opened and closed by the valve faces 17 of the cylinder heads 3 coming into contact with or separating from valve seats 29 installed on the exhaust boats 4 and 5 of the cylinder head 3. Therefore, the flow rate of exhaust gas is controlled and exhausted from the cylinders of the engine 13 by the opening/closing operation or amount of opening/closing of these exhaust boats 4.5. A movable element 22 made of a magnetic material such as soft iron is fixed to the upper end 23 of the exhaust valve 1.2, and a movable element coil 24 is provided on this movable element 22.

Further, a stator 25 made of a magnetic material such as soft iron is installed in the cylinder head 3 above the movable element 22, and a stator coil 2 is mounted on the stator 25.
0 is set. Therefore, when the movable coil 24 and the stator coil 20 are energized/cut off, the stator 25 attracts the movable element 22 and reverses its direction by 7M, driving the exhaust valve 1.degree. 2 up and down. Note that a valve spring 26 is disposed between the valve spring seat formed on the upper surface of the cylinder head 3 and the movable element 22. Therefore, the exhaust valve 1.2 is normally closed by the spring force of the valve spring 26.

Furthermore, regarding intake and exhaust valves operated by magnetic force,
The material composing the intake and exhaust valves themselves is made of ceramic material to reduce weight, and is made of non-staining material to prevent iron powder etc. from adhering to the valve face 17 of the intake and exhaust valves and the sliding parts of the valve stems. Preferably, the valve face 1 is made of magnetic ceramic material.
If iron powder etc. is adsorbed to the sliding parts of 7 and the knob stem,
The airtightness of the intake/exhaust boat by the intake/exhaust valves deteriorates, and the frictional resistance of the sliding parts increases, resulting in undesirable conditions such as seizure. Therefore, in order to operate the intake and exhaust valves by electromagnetic force, a mover 22 made of a magnetic material is separately provided at the upper end of the intake and exhaust valves. By configuring the intake and exhaust valves as described above, when the controlled current from the controller 15 is energized or cut off to the mover coil 24 and the stator coil 20, the stator 25 moves the mover 22 to the spring 26. A separation or suction can be performed against the biasing force, so that the exhaust valve 1.2 is lowered or raised, and the valve face 1 of the exhaust valve 12
7 can open or close the exhaust boat 4.5.

Is this engine Hff valve system? 21! The i-magnetic valve drive device into which the device can be incorporated is provided with an engine load sensor 31 to detect the load on the engine 13. The engine load sensor 31 detects the engine load, and in this embodiment, detects the amount of fuel supplied from the injection nozzle 12 of the fuel injection device 21 to the engine 13, or detects the amount of fuel supplied to the engine 13 from the injection nozzle 12 of the fuel injection device 21, or This can be detected by detecting the stepping crab. In other words, the engine load sensor 31 is
It can be configured with a sensor for detecting the amount of fuel supplied to the engine 13 and/or a sensor for detecting the amount of depression of the accelerator pedal 28. Therefore, by inputting a signal indicating the amount of fuel supplied to the engine 13 and/or the amount of depression of the accelerator pedal 28 as an engine load signal to the controller 15, the 1ift valve of the intake and exhaust valves can be controlled.

That is, in response to the load signal input to the controller 15,! A current can be passed through the stator coil 20 and the movable coil 24 in the magnetic valve drive device to excite the electromagnet and drive the valve.

An intake flow meter or flow sensor 30 is arranged in the intake passage 10.11. This flow rate sensor 30 detects, for example, the airflow that hits a hot wire through which an electric current is passed, by changing the resistance bond of the heating wire, and the cough flow rate sensor 3
The signal from 0 is input to the intake flow rate processing device, and the amount of intake air passing through the intake passage 10.11 can be detected.

This detected amount of intake air is input to the controller 15.

The controller 15 consists of a micro combi-ac,
The f4' is equipped with a central control unit that performs processing, arithmetic processing procedures, various memories that store control means, etc., input/output boards, etc., and various signals from the various sensors and intake flow rate processing devices mentioned above are input. Then, processing is performed according to the procedure stored in the memory, and the electromagnetic coil 2 for the valve mechanism for opening and closing the intake valve 18.19 and the exhaust valve 1.2 is
A control command is issued to 0.24 to control the opening/closing operation of the intake and exhaust valves. Further, the controller 15 is configured to calculate not only the opening/closing operation of the intake and exhaust valves but also the valve opening degree, valve lift, fuel injection timing, etc., and to issue control commands. In addition, in the figure, 27
is a battery, and the battery 27 is connected to the controller 1.
5. T for various coils for valve trains, etc. This is one source.

Next, an electromagnetic valve drive device into which a 7:1 magnetic valve control device for an engine according to the present invention can be incorporated is constructed as described above, and an example of the operation of this valve control device is shown in the drawings. Refer to and explain. FIG. 4 is a driving end range diagram showing the driving state of the exhaust valves 1 and 2 in an electromagnetic valve driving device into which this tT11 valve control device can be incorporated. Also, Fig. 6 shows the ia6! which can incorporate this electromagnetic valve control device! ! It is a processing flow diagram showing an example of operation of a valve driving device.

The valve control device of the engine according to the present invention comprises two valve control devices.
It opens and closes two exhaust valves 1.2 and two intake valves 18.19 by a T1m force, and includes detection means, that is, a rotation sensor 14, which detects the rotation of the engine 13, and a load sensor 31, which detects the load state of the engine. That is, it has a depression amount sensor that detects the amount of depression of the accelerator pedal 28 and/or a fuel supply amount sensor that detects the amount of fuel injected into the cylinder from the injection nozzle 12 of the fuel injection device 21, and a rotation sensor. The two exhaust valves 1. It has a control means or controller 15 for controlling the opening and closing of two intake valves 18 and 19.

Furthermore, this one! The magnetic valve control device is a fuel supply device 21
The opening and closing of both intake valves 18.19 is thereby controlled in response to the intake air flow rate signal flowing through each intake passage 10.11.

Engine 1 according to this invention! An embodiment of the magnetic valve control device will be described with reference to the processing flow diagram of FIG. As the engine 13 starts, the ttff valve drive device is controlled. First, as a first step, the engine
3, the intake valve 18.19 and the exhaust valve 1.2 are driven. The rotational speed of the engine 13 is detected by a rotation sensor 14, and the engine output signal is input to a controller 15. Further, the load on the engine 13 is detected by the load sensor 31. Specifically, the engine load is determined by using a depression amount signal detected by a sensor for detecting the depression amount of the accelerator pedal 28 as a load signal for the engine 13. 15, or the fuel supply amount injected from the injection nozzle 12 of the fuel supply device 21 is detected by the fuel supply amount detection sensor, and the detected fuel supply amount signal is similarly input to the engine 13.
It is detected by inputting it to the controller 15 as a load signal. Furthermore, the intake flow rate passing through the intake passage [0°11] is detected by the flow sensor 30 installed in the intake passage 10.11, and the detected intake flow rate signal is input to the controller 15 (step 40).

It is determined whether the engine rotation speed Nt detected by the rotation sensor 14 that detects the rotation speed of the engine 13 is larger than a predetermined rotation speed N□ calculated in advance, and the engine rotation speed detected by the load sensor 31 of the engine 13 is determined. a predetermined engine load calculated in advance;
Determine whether it is greater than or not. The engine load can be detected by a detection signal detected by a detection sensor on the fuel supply lid from the fuel nozzle 12 to the engine 13 and/or by detection No. 4i detected by a detection sensor for the amount of depression of the accelerator pedal. Moreover, the specified load L! + is the predetermined rotational speed N! of the engine 13, as shown in FIG. This is a function that changes along the solid line A in response to l. Therefore, the engine speed N7 is set to the predetermined speed N7.
, 1 or more, and it is determined whether or not the detected engine load L7 is large based on the load signal Lt+, which is determined in response to the rotation speed signal and is greater than or equal to a predetermined value (step 41).
.

The detected engine rotation speed N is larger than a predetermined rotation speed N□ and the detected engine load is
is larger than the predetermined engine load LEI calculated in advance, the intake passage 1 of the engine is
The intake air flow rate at 0.11 is detected by the flow rate sensor 30, and the detection signal is input to the intake flow rate processing device and processed. 1csz+
It is determined whether or not the value is greater than (step 42).

Then, the intake air l CN in the intake passage 10.11
If t is larger than the predetermined intake air amount C8□ calculated in advance, the driving conditions of the valve driving system of the electromagnetic valve driving device are checked (step 43).

If the drive conditions of the valve drive system of the electromagnetic valve drive device are checked and there is no abnormality, both exhaust valves 1 and 2 are driven, and the exhaust valves 1 and 2 are double driven, that is, both valves are operated. The detection signal is input to the controller 15, and the signal from the controller 15 supplies current to the stator coil 20 and movable coil 24 in the TM valve drive device, and operates both exhaust valves 1.2 to open and close them. Operate. That is, the operating state of the engine 13 is a high load state, and at this time, the cylinder internal gas pressure is high. Therefore, by opening and closing the two exhaust valves 1 and 2, the exhaust gas immediately after the opening of the exhaust valve is blown out, causing a significant pressure drop in the cylinder due to blowdown, and reducing the inertia of the exhaust gas flow. Generates a force, then pulls the gas in the cylinder by the inertial force of the exhaust gas flow at one end of the exhaust process P, and exerts the effect of exhausting it all at once, reduces the pumping work in the exhaust process, and at the beginning of the subsequent intake process, Intake air is drawn into the cylinder by the action of inertia to improve ventilation efficiency (step 44).

Furthermore, it is determined whether or not to continue driving the engine, and if the engine is to be driven, the process returns to the first step 40. In addition, when stopping the engine drive, this Tg,
Control of the Yu valve drive device ends (step 45).

In step 41, the detected engine rotation speed N,
is a pre-calculated predetermined rotation speed N! not greater than 1,
In addition, when the detected engine load line is not larger than a pre-calculated predetermined engine load Lt+, and when the intake air amount C□ in the intake passage 10.11 is not larger than the pre-calculated predetermined intake air it Cwwl. In this case, the load on the engine 13 is low and the intake flow rate is small, so it is not preferable to open and close the two exhaust valves 1 and 2 as described above. Therefore, in order to control the controller 15 to open and close one exhaust valve l and keep the other exhaust valve 2 closed, the driving conditions of the valve drive system of the electromagnetic valve drive device are checked (step 46). ).

If the driving conditions of the valve drive system of the electromagnetic valve drive device are checked and there is no abnormality, the exhaust valve 1 is opened and closed, and the exhaust valve 2 is held in the closed state, so that the valve system is in single operation, that is, one exhaust valve 1 is operated. Operates the valve train. Each detection signal is input to the controller 15, and the controller 15
A current is supplied to the stator coil 20 and movable coil 24 in the t-magnetic valve drive device, and the exhaust valve 1 is actuated to open and close. (Step 47
).

Furthermore, it is determined whether or not to continue driving the engine, and if the engine is to be driven, the process returns to the first step 40. Further, when stopping the engine drive, this control of the electromagnetic valve drive device '+71 is ended (step 48).
.

〔Effect of the invention〕

The present invention is configured as described above and has the following effects. That is, the present invention provides an electromagnetic valve control device that opens and closes two exhaust valves using TX magnetic force, which includes detecting means for detecting the rotational speed and load condition of the engine, and a rotational speed signal higher than a predetermined value from each of the detecting means. and controlling the opening and closing of both exhaust valves in response to a load signal of a predetermined value or higher determined in response to the rotation speed signal, and opening and closing one of the exhaust valves in response to a rotation speed signal and a load signal other than the above. Since the controller is configured with a controller that opens and closes the exhaust valve and maintains the other in the closed state, when the load signal of the engine exceeds a predetermined level, that is, when the engine is under high load, the two exhaust valves open and close in response to the electrical signal to blow. It is possible to cause a significant pressure drop in the cylinder due to down, and in addition, the inertial force of the exhaust gas flow causes the gas in the cylinder to be exhausted all at once, and the inertial force of the exhaust gas causes intake air to be sucked into the cylinder. , improving the intake efficiency in the subsequent intake process. On the other hand, when a load signal other than the above, that is, when the engine is under low load, one of the exhaust valves is opened and closed in response to the low load signal, and the other is maintained in the closed state to maintain the gas pressure in the cylinder to a certain extent. The inertia force is maintained in the exhaust gas flow, and the exhaust process is performed below the back pressure base.The inertia force of the exhaust gas flow allows the gas in the cylinder to be smoothly exhausted, and the intake During the subsequent intake stroke when the valve is opened, intake air is sucked into the cylinder by the action of the inertial force, thereby improving the intake efficiency during the intake stroke.

However, the two intake valves and the two exhaust valves are operated by electromagnetic force and can be opened and closed, so compared to the control valves of conventional mechanical valve mechanisms such as camshafts, the crank angle and can independently control valve operation. Therefore, as mentioned above, engine rotation,
It can be controlled in response to the engine load and intake air amount, and exhaust gas can be smoothly exhausted from the cylinder through the exhaust pipe, thereby making it possible to perform control that improves the inflow efficiency of intake air. be.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the relationship between intake and exhaust valves into which the t+n valve control device of the engine according to the present invention can be incorporated, Fig. 2 is a PV diagram showing the operation of the engine, and Fig. 3 is a PV diagram showing the operation of the engine.
The figure is a PV diagram showing high load and partial load operation of the engine, and Fig. 4 is a drive range diagram showing the drive state of the exhaust valve in the NKI valve drive device that can incorporate this Tt, fa valve control device. , FIG. 5 is an explanatory diagram showing an example of an electromagnetic valve driving device into which the engine t&f1 valve control device according to the present invention can be incorporated, and FIG.
The figure is a process flow diagram showing an example of the operation of an electromagnetic valve drive device into which this electromagnetic valve control device can be incorporated. 1.2--1. Exhaust valve, 3.--Cylinder head,
4.5--- Exhaust boat, 6.7-- Exhaust gas passage, 8.9-- Intake port, 1.0.11
-・-Intake passage, engine, 14--Rotation sensor, 15 controller, 18.19--Intake valve, 20,-Stator coil, 21--Fuel injection device, 28-- 1-Accelerator pedal, 30--Flow rate sensor load sensor] 3 1 Fig.

Claims (1)

[Claims] In an electromagnetic valve control device that opens and closes two exhaust valves using electromagnetic force, each detecting means detects the rotation speed and load condition of the engine, and a rotation speed signal of a predetermined or higher speed from each of the detection means and a rotation speed signal corresponding to the rotation speed signal are provided. Controlling the opening and closing of both of the exhaust valves in response to a correspondingly determined load signal of a predetermined value or higher, and opening and closing one of the exhaust valves in response to a rotational speed signal and a load signal other than the above, and opening and closing the other exhaust valve. An engine electromagnetic valve control device comprising: a controller for maintaining a closed state;