JPH02264129A - Electromagnetic valve control device of engine - Google Patents

Abstract

PURPOSE:To eliminate loss of flow rate so as to send intake air to the inside of a cylinder effectively by responding to a rotating signal which is less than a specified rotating speed of an engine and a load signal which is more than a specified load, and by opening and closing one of intake valves. CONSTITUTION:An electromagnetic valve control device 15 of an engine 13 inputs a load signal which is expressed by the operation quantity of an engine speed sensor 14 and the stepped-in quantity of an acceleration pedal 28, or fuel supply from an injection nozzle 12 of a fuel injector 21, or intake quantity from an intake flow meter 29 and an intake flow unit 30. In response to the rotational signal which is less than a specified rotating speed and the load signal which is more than a specified load, a stator coil 20 and a needle coil 24 are energized and one of an intake valve 1 or 2 is closed, thereby intake air is flowed through an intake port 4 or 5 to the inside of a cylinder.

Description

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

[Conventional technology]

Conventionally, there have been many attempts to achieve an inertial supercharging device for an engine by dualizing an inlet boat, that is, an intake port, and an inlet pipe, that is, an intake pipe. For example, as shown in FIG. 5, in an engine having a first intake valve 41, a second intake valve 42, an intake boat 44 in which the intake valve 41 is disposed, and an intake boat 45 in which the intake valve 42 is disposed, When the control knob 43 installed on the intake pipe 47 is closed, part of the intake air flows to the intake port I-45 on the intake valve 42 side, and the remaining part passes through the bypass passage 48 to the intake air on the intake valve 41 side. However, the intake air is sent to the port 44 only through the intake pipe 46 of the first intake valve 41, and the flow rate of the intake air increases, and the inertial supercharging effect is reduced in the low speed region. and the peak of inhalation efficiency appears. Intake pipe 4
When the control valve 43 installed in the intake pipe 7 is opened, intake air flows through the intake pipe 46 and the intake pipe 47. N
It becomes higher at higher engine speeds.

Therefore, the intake efficiency peaks when the engine is at high speed.

An example of such an intake system for a multi-intake valve type engine is disclosed in Japanese Patent Publication No. 35807/1983.

By the way, the opening and closing operations of engine intake and exhaust valves have long been driven by a mechanical valve mechanism such as a camshaft, but instead of this mechanical valve mechanism, an electric motor using a suction saw such as a solenoid has been used. The proposal to operate the valve by a mechanism is
For example, JP-A-58183305, JP-A-61-
It is disclosed in Japanese Patent No. 76713.

[Problem to be solved by the invention]

However, in the system shown in Figure 5 above,
When the control valve 43 is closed, the port flow velocity that has increased in the intake pipe 46 branches and expands in the bypass passage 48 between the intake pipe 46 and the intake pipe 47, and the flow velocity becomes slow, making it impossible to control the swirl (and causing inertia). Even if there is a force, port resistance and flow direction change occur as it passes through the bypass passage 48, turbulence occurs, and a restriction occurs, and when it enters the engine cylinder, it is sucked in at a reduced flow speed. The loss will be large and the effect cannot be expected much.

In addition, in the proposal to use an electromagnetic mechanism to operate the intake and exhaust valves, the opening and closing timing of the valves is controlled electrically, but the control of valve opening and closing according to the engine load and rotation is not taken into account, resulting in losses. The problem is that it becomes large.

The purpose of this invention is to solve the above-mentioned problems by controlling the opening and closing operations of each intake and exhaust valve according to engine rotation and load conditions, and closing the intake valve in one intake pipe at low engine speeds. The system maintains the inertial force of the intake air flowing through the other intake pipe and efficiently sends intake air into the cylinder from the other open intake valve, eliminating loss due to flow rate reduction and efficiently sending intake air into the cylinder. An object of the present invention is to provide an electromagnetic valve control device for a pumping engine.

[Failure to solve the problem]

In order to achieve the above object, the present invention is configured as follows. That is, the present invention provides an electromagnetic valve control device that opens and closes two intake valves by electromagnetic force, and includes detection means for detecting engine rotation and load conditions, and detection means for detecting engine rotation speed below a predetermined engine speed. The present invention relates to an electromagnetic valve control device for an engine, including a control means for controlling the closing of one of the intake valves in response to a rotation signal and a load signal of a predetermined load or higher.

Further, the control means controls one of the intake valves to close in response to an air flow rate signal in which the air flow rate flowing through the intake pipe is less than or equal to a predetermined value.

[Effect]

This invention is constructed as described above and operates as follows. That is, the electromagnetic valve control device for this engine closes one intake valve in response to a rotation signal from the engine rotation detection means that is below a predetermined rotation speed and a load signal from the engine load detection means that is above a predetermined load. Intake air flows into the cylinder through the intake port of the other open intake valve while maintaining the same inertia force as it flows through the intake pipe at high speed, making the intake air more efficient compared to conventional intake systems. There will be an influx. Here, the engine speed can be detected by an engine speed sensor provided for the engine, and the engine load can be detected by detecting the amount of fuel supplied to the fuel load device or the amount of depression of the accelerator pedal. A detection signal can be obtained by this. Furthermore, the amount of intake air can be detected by an air flow meter installed at the intake port.

〔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, a cylinder and an intake/exhaust port for incorporating an electromagnetic valve control device for an engine according to the present invention are shown. The cylinder head 3 of this cylinder has
For example, 4 valves can be installed for intake and exhaust valves.
Two ports are formed. That is, two of the four ports are intake ports 4.5, and the other two are exhaust ports 8.9. The intake valve 1 is arranged on an intake boat 4, and the intake valve 2 is arranged on an intake boat 5. Further, an intake vibro is connected to the intake port 4, and an intake pipe 7 is connected to the intake port 5. These intake vibrators 7 are formed independently and separated from each other from the intake manifold, and are connected to an intake port 4.5 formed in the cylinder head 3. Further, the exhaust boat 8 is provided with an exhaust valve (not shown) and communicated with an exhaust pipe 10, and the exhaust boat 9 is provided with an exhaust valve and communicated with an exhaust pipe 11. .

Next, an example of an electromagnetic valve drive device into which this engine electromagnetic valve control device can be incorporated will be described with reference to FIG. As shown in FIG. 4, this electromagnetic valve drive device is built into the engine 13,
The main parts of the electromagnetic valve drive device are conceptually shown as being taken out from the engine 13. The fuel injection device 21 that controls the fuel supplied to the engine 13 has an injection nozzle 12 that penetrates into the intake port 4.5 from the upper part of the cylinder head 3, and the fuel injected from the nozzle hole into the cylinder. The spray is introduced into the interior.

This fuel injection device 21 is controlled by a command from the controller 15 to inject a predetermined amount of fuel. Further, an engine 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 intake valves 1 and 2 are made of ceramic material, and are arranged to be slidable in the vertical direction while being guided by a valve guide 16 fixed to the cylinder head 3. Although the figure only shows the intake valve 1.2, the electromagnetic valve drive device that can incorporate the electromagnetic valve control device for this four-valve engine also electromagnetically drives each exhaust valve. It is something that

Intake valve 1 by raising or lowering intake valve 1.2
．． 2, the valve face 17 of the cylinder head 3 is connected to the intake bow 1-4. ．． The intake ports 4 and 5 are opened and closed by coming into contact with or separating from a valve seat 18 installed at the valve seat 5 . Therefore, the amount of intake air into the cylinders of the engine 13 is controlled by the opening/closing operation or opening/closing amount of these intake ports 4.5. A mover 19 made of a magnetic material such as soft iron is fixed to the upper end 23 of the intake valve 1.2, and the mover 19 is provided with a mover coil 24. Further, a stator 25 made of a magnetic material such as soft iron is installed in the cylinder head 3 above the movable element 19, and a stator coil 20 is provided in the stator 25. There is. Therefore, the movable coil 24 and the stator coil 20 are energized/
By being shut off, the stator 25 causes the movable element 19 to bow/separate, thereby driving the intake valves 1 and 2 up and down. Note that a valve spring 26 is disposed between a valve spring seat formed on the upper surface of the cylinder head 3 and the movable element 19. Therefore, the intake valves 1 and 2 are normally closed by the spring force of the valve spring 26.

Furthermore, regarding intake and exhaust valves that are operated by electromagnetic force, the material that constitutes the intake and exhaust valves themselves is made of ceramic material to reduce weight, and the sliding parts of the valve face 17 and valve stem of the intake and exhaust valves are In order to prevent iron powder etc. from being adsorbed to the part, it is preferable to make it from a non-magnetic ceramic material. However, valve face 17
If iron powder or the like is adsorbed to the sliding part of the valve stem, the airtightness of the intake/exhaust boat by the intake/exhaust valves will deteriorate.
Furthermore, the frictional resistance of the sliding portion increases, resulting in undesirable conditions such as seizure. Therefore, in order to operate the intake and exhaust valves by electromagnetic force, a mover 19 made of a magnetic material is separately coated on the upper end of the intake and exhaust valves. By configuring the intake and exhaust valves as described above, the controller 1
When the controlled current from 5 is energized or cut off to the mover coil 24 and the stator coil 20, the stator 25 can move the mover 19 away from or attract it against the biasing force of the spring 26. Therefore, the intake valve 1.2 can be lowered or raised, and the valve face of the intake valve 12 can open or close the intake bow 1-4.5.

An electromagnetic valve drive device into which this engine electromagnetic valve control device can be incorporated is provided with an engine load sensor to detect the load of the engine 13.

This engine load sensor detects the engine load, and in this embodiment, it detects the amount of fuel supplied to the engine 13 from the injection nozzle 12 of the fuel injection bag W21, or detects the amount of fuel supplied to the engine 13 from the injection nozzle 12 of the fuel injection bag W21, or detects the amount of fuel supplied to the engine 13 from the injection nozzle 12 of the fuel injection bag W21. It can be detected by detecting the amount. In other words, the engine load sensor 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, the signal of the amount of fuel supplied to the engine 13 and/or the amount of depression of the accelerator pedal 28 is used as the engine load signal,
By inputting to the controller 15, the electromagnetic valves of the intake and exhaust valves can be controlled. That is, in response to a load signal input to the controller 15, current can be applied to the stator coil 20 and mover coil 24 in the electromagnetic valve drive device to excite the electromagnet and drive the valve. .

An intake flow meter 29 is disposed on the intake vibro 7. This intake flow meter 29 detects, for example, the air flow that hits a heating wire through which an electric current is passed, based on a change in the resistance value of the heating wire, and the signal from the intake flow meter 29 is input to an intake flow rate processing device 30. The amount of intake air passing through the intake vibro, 7 can be detected. This detected intake air amount is input to the controller 15.

The controller 1-roller 15 is composed of a microcomputer, and is equipped with a central control unit that performs arithmetic processing, various memories that store arithmetic processing procedures, control means, etc., input/output ports, etc. When various signals are input from sensors, intake flow rate processing device 30, etc., processing is performed according to procedures stored in memory, and electromagnetic coils for the valve mechanism for opening and closing the intake valve, 7, and exhaust valve are processed. 20.2
4 to control the opening and closing operations of the intake and exhaust valves. In addition, the controller 15 is not limited to the above-mentioned opening/closing operation of the intake and exhaust valves, but also controls valve opening, valve lift,
It is configured to perform calculations such as fuel injection timing and issue control commands.

In addition, in the figure, 27 is a battery, and the controller 15
It serves as a power source for various coils for valve trains, etc.

Next, an electromagnetic valve drive device into which the electromagnetic 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 electromagnetic valve control device is shown in FIGS. This will be explained with reference to FIG.

FIG. 2 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. Further, FIG. 3 is a driving range diagram showing the driving states of the intake valves 1 and 2 in an electromagnetic valve drive device into which this electromagnetic valve control device can be incorporated.

The electromagnetic valve control device for an engine according to the present invention opens and closes, for example, two intake valves 1.2 and two exhaust valves (not shown) by electromagnetic force, and detects the rotation of the engine 13. Detection means for detecting the load state of the engine, that is, a depression amount sensor for detecting the amount of depression of the accelerator pedal 28, and/or fuel injected into the cylinder from the injection nozzle 12 of the fuel injection device 21. It has a fuel supply amount sensor that detects the supply amount, and responds to a rotation signal of the engine at a predetermined rotation speed or less from the engine rotation sensor 14, or responds to a rotation signal of the engine from the depression amount sensor and/or the fuel supply amount sensor. It has a control means, ie, a controller 15, which responds to a load signal in which the load is greater than a predetermined load and controls the closing of one of the intake valves 1 or 2 accordingly.

Further, in this electromagnetic valve control device, the fuel supply device 21 controls one of the intake vibrators 7 to close in response to an intake air flow rate signal in which the intake air flow rate flowing through each intake vibro 7 is equal to or less than a predetermined value. be. In this way, when the engine speed is low and the engine load or intake air amount is small, if either the intake HAL PRO or 7 operates the valve and the other is maintained in the closed state, the intake air will operate the valve. It flows through the intake boat at high speed and flows into the engine cylinder while maintaining its inertia.

Therefore, the engine electromagnetic valve control device according to the present invention can feed intake air into the cylinder more efficiently than the conventional electromagnetic valve drive device as shown in FIG.

Therefore, one embodiment of the electromagnetic valve control device for an engine according to the present invention will be described with reference to the process flow diagram of FIG. As the engine 13 starts, the electromagnetic valve drive device is controlled. First, as a first step, by driving the engine 13, the engine rotation speed is detected by the engine rotation sensor 14, and the detection signal is input to the controller 15. The depression amount signal detected by the detection sensor for the depression amount of the accelerator pedal 28 is
The signal is input to the controller 15 as a load signal for the engine 13. Alternatively, 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 controller 15 as a load signal of the engine I3. . Furthermore, the intake flow meter 2 installed on the intake vibro, 7
The signal from 9 is input to the intake flow rate processing device 3o, and the amount of intake air passing through the intake vibro 7 can be detected. This detected intake air amount is input to the controller 15.

(Step 30) It is determined whether the engine rotation speed N detected by the engine rotation sensor 14 is larger than a predetermined rotation speed N,1 calculated in advance. In this case, the predetermined rotational speed NE
As shown in FIG. 3, l is a value that changes along the straight line A depending on the load Lt of the engine 13. -111~----------<Step 31) If the engine speed N is smaller than the predetermined engine speed NEI, the intake air is flowed at high speed through one intake vibro, In order to maintain the inertial force through the ports 1-4 and flow into the cylinder, the signal of the engine rotation speed NE is input to the controller 15, and the stator coil 20 and movable in the electromagnetic valve drive device are controlled by the signal from the controller 15. Supplying current to the child coil 24, one intake valve 1
The intake valve 2 is operated to open and close, and the other intake valve 2 is maintained in a closed state.

・-(Step 34) Further, the engine rotation speed N□ is a predetermined rotation speed N.

If it is larger, the engine load is detected by the engine load sensor. Engine load is fuel nozzle 1
2 to the engine 13, and/or a detection signal detected by a sensor to detect the amount of depression of the accelerator pedal 28. It is determined whether the engine load is larger than a predetermined engine load LEI calculated in advance. In this case, the predetermined load LE is a value that changes along the straight line A depending on the rotational speed NE of the engine 13, as shown in FIG.

(Step 32) If the engine load is smaller than the predetermined engine load LEI, the intake air is caused to flow at high speed through one intake vibro, and the inertia of the flow rate is maintained through one intake port 1-4 to maintain the inertia of the flow inside the cylinder. The signal of the engine load LE 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 electromagnetic valve drive device, and the other intake valve 2 remain closed.

(Step 34) If the engine load is larger than the predetermined engine load LEI, the amount of intake air in the intake vibro 7 of the engine is detected based on the detection signal of the intake flowmeter 29. The detection signal of this intake flow meter 29 is manually input to an intake flow rate processing device 30 and processed. That is, the intake vibro,
It is determined whether the intake air amount C1 at step 7 is larger than a predetermined intake air amount C1l□ calculated in advance.

-----<Step 33) If the intake air 1tcNE in the intake vibro 7 is smaller than the calculated predetermined intake air amount CIIE+, the intake air is caused to flow at high speed through one intake vibro, and the intake air is passed through one intake vibro 7 at high speed. In order to maintain the inertial force of the flow rate and flow into the cylinder, a signal of the intake air amount CNH is inputted to the controller 15, and the stator coil 20 and the movable coil in the electromagnetic valve drive device are controlled by the signal from the controller 15. 24 to keep the other intake valve 2 closed.

(Step 34) If the intake air amount C■ in the intake vibro 7 is larger than the predetermined intake air amount CNE calculated in advance, the drive conditions of the valve drive system of the electromagnetic valve drive device are checked.

(Step 35) If the drive conditions of the valve drive system of the electromagnetic valve drive device are checked and there is no abnormality, both intake valves 1 and 2 are driven, resulting in double drive of intake valves 1 and 2, that is, both valves are operated. I do.

(Step 36) An example of the drive range of the intake valves 1 and 2 is shown in FIG. That is, the pre-calculated engine speed Nl
:I and the pre-calculated predetermined engine load LEI are variables that change along a straight line depending on the engine speed and the engine load.

In the leap, drive region B is a double drive region that drives two intake valves 12, and drive region C is a single drive region that keeps one intake valve 1 closed and drives only the other intake valve 2. This is the driving area.

〔Effect of the invention〕

The electromagnetic valve control device for an engine according to the present invention is configured as described above, and has the following effects. That is, the electromagnetic valve control device for this engine includes detection means for detecting engine rotation and load conditions, and responds to a rotation signal of the engine at a predetermined rotation speed or less and a load signal of a predetermined load or more from each detection means. and control means for controlling one of the intake valves to close,
Intake air flows into the cylinder through the intake port of the other intake valve in the open state, which operates the valve, while maintaining the same inertia force as it flows through the intake pipe at high speed. Compared to conventional intake systems, the intake air is Air is efficiently introduced.

Furthermore, the control means can control one of the intake valves to close in response to an intake air flow rate signal in which the intake air flow rate flowing through each intake pipe is less than or equal to a predetermined value. You can improve.

However, since the two intake valves can be operated by electromagnetic force to open and close, the valves can be operated independently of the crank angle, compared to conventional control valves with mechanical valve mechanisms such as camshafts. can be controlled. Therefore, as described above, control can be performed in response to engine rotation, engine load, and intake air amount, and control can be performed to improve intake air inflow efficiency.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the relationship between intake and exhaust valves into which the electromagnetic valve control device for an engine according to the present invention can be incorporated, and Fig. 2 is an example of the operation of an electromagnetic valve drive device into which this electromagnetic valve control device can be incorporated. FIG. 3 is a drive range diagram showing the driving state of the intake valve in an electromagnetic valve drive device in which this electromagnetic valve control device can be incorporated, and FIG. 4 is a process flow diagram showing the electromagnetic valve control device for an engine according to the present invention. An explanatory diagram showing an example of an electromagnetic valve driving device that can be incorporated, and FIG. 5 are a schematic diagram showing the relationship between intake and exhaust valves of a conventional engine. 1; 2------One intake valve, 3---Cylinder head, 4, 5---One intake boat, 6.7-
--- Intake pipe, 8.9 --- Exhaust port,
13-------1 engine, 14 engine rotation sensor, 15---controller, 19-------・
Mover, 20--Stator coil, 21--
・-Fuel injection device, 24-1---Mover coil, 25
---1 stator, 2 B----accelerator pedal. Applicant Isu Jidosha Co., Ltd. Agent Patent Attorney So Naka Onaka

Claims (2)

[Claims] (1) An electromagnetic valve control device that opens and closes two intake valves using electromagnetic force, which includes detection means for detecting engine rotation and load conditions, and rotation signals of the engine at or below a predetermined rotation speed from each detection means. An electromagnetic valve control device for an engine, comprising: control means for controlling the closing of one of the intake valves in response to a load signal of a predetermined load or more. (2) The electromagnetic valve control device for an engine according to claim 1, wherein the control means closes one of the intake valves in response to an intake air flow rate signal in which the intake air flow rate flowing through each intake pipe is equal to or less than a predetermined value.