JPH0442498Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention relates to a variable swirl port in which an intake port is opened and an air passage is connected in order to adjust the swirl strength of combustion air within the intake port. ,
In particular, the present invention relates to a variable swirl port that improves the safety and reliability of an engine by making it possible to detect the operating state of an on-off valve that opens and closes the air passage.

[Prior Art] In conventional diesel internal combustion engines, variable swirl devices have been proposed for the purpose of improving low-temperature startability, reducing smoke, and improving fuel efficiency.

This proposal is based on the upstream side of the helical intake port or intake pipe, and the combustion chamber side (downstream side) of the intake port.
An on-off valve is provided to connect the air passages to form an air passage, and to open and close the air passage as appropriate depending on the engine speed and engine load. This adjusts the inside of the intake port to a high swirl.

However, since the above proposal does not include a means for notifying the operating state of the on-off valve, it has not been possible to confirm how the swirl strength is actually set. Therefore, if the high swirl setting remains due to malfunction of the on-off valve, the combustion chamber of the engine will become abnormally hot, causing cracks due to the rise in piston head temperature, or if the swirl setting remains low. If this happens, it may cause a drop in output or stall the engine, which remains a problem.

Therefore, as a conventional example of opening and closing sub-passages branched from the main passage such as the above-mentioned air passage and checking their operating status, the proposal of Japanese Utility Model Application No. 55-105605 shown in Fig. 2 is known. There is.

This proposal consists of a wastegate valve that opens and closes an exhaust bypass passage that branches off from the exhaust passage of an internal combustion engine, and a diaphragm that operates in response to the pressure inside the intake pipe of the intake system. Specifically, the diaphragm means is constructed as shown in FIG.

As shown in the figure, inside the closed container c, one pressure chamber e partitioned by a diaphragm d has an opening facing the stem end of the waste gate valve f, and is housed integrally with the closed container c. A cylindrical member g is provided. In addition, in the other pressure regulating chamber h, there is a first
A spring i is provided.

In order to detect the operating state of the wastegate valve d which is directly connected to the diaphragm d and opens and closes, a limit switch j is integrally provided in the cylindrical member 9 at its tip for outputting an electric signal by contacting the stem end _f1 of the wastegate valve d.
A bellows chamber k is provided integrally with the intake pipe and extends toward the stem end, to which air under pressure is supplied.

The limit switch j is disposed in a cabin or the like, and is connected to an alarm device l which generates an alarm based on its signal and notifies the driver.

In this way, the above proposal maintains a constant distance between the stem end _f1 and the limit switch j when the diaphragm d is operating normally;
When the diaphragm d is damaged, the limit switch j comes into contact with the stem end _f1 and activates the alarm device l to warn of the damage to the diaphragm d.

[Problems to be solved by the invention] However, the above proposal only informs the driver when the diaphragm is torn, and how to deal with deterioration of the response due to deterioration of the diaphragm or low-temperature hardening, etc. However, this leaves questions about the reliability of the warning.
Further, this configuration cannot be applied to a device such as a variable swirl port, in which the operating state of the on-off valve is checked each time the high/low swirl setting is made.

[Purpose of the invention] The present invention was devised to solve the above-mentioned problems, and the purpose of the present invention is to make it possible to check the operating control state of the variable swirl port from the operating state of the on-off valve. The aim is to improve the quality and reliability of institutions.

[Summary of the invention] In order to achieve the above object, the present invention has an air passage provided by connecting the downstream part of the intake port and the intake pipe in order to switch the intensity of the intake swirl between high and low, and the above-mentioned intake air passage. It is provided in the pipe, and when the air passage is moved forward to the inlet to the maximum, the inlet is fully closed and the intake port is switched to high swirl, and when the air passage is retreated to the maximum from the inlet, the inlet is fully opened and the intake port is switched to high swirl. An actuator valve that switches to low swirl, a controller that outputs ON and OFF signals to switch the actuator valve to fully close or fully open the above inlet, and a controller that detects the stroke position of the on-off valve and switches the actuator valve to the above flow. There is a sensor that is ON when the inlet is fully open and OFF when the inlet is fully closed, and a sensor that is ON when the above sensor is ON and the controller is generating an ON signal, and a sensor that is OFF when the sensor is OFF and the controller is generating an OFF signal. The system is equipped with a discrimination circuit that lights up a warning light when the engine is running, and the operating state of the on-off valve can be detected, increasing the reliability of intake swirl control and improving engine safety.

[Embodiment] A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

As shown in FIG. 1, a cylinder head 1 is provided with an intake port 3 for sucking combustion air into each cylinder 2, and an intake pipe 4 is connected to this intake port 3. The intake port 3 has an intake valve hole 6 on the most downstream side that has a helical shape as a swirl generation region, and the combustion air flowing through the intake port 3 is swirled at the intake valve hole 6 (swirling flow). The air is then inhaled into the cylinder 2.

Further, an air passage 7 connected to the intake port 3 of the cylinder head 1 introduces air for swirl adjustment to weaken the swirl strength.
is provided. In the illustrated embodiment, the air passage 7 is a bypass passage 8 that bypasses a part of the intake air from the intake pipe 4 to the intake valve hole 6, and a part of the intake air is used for swirl adjustment air. is used. The outlet 9 of the bypass passage 8 is opened facing the intake valve hole 6.
By introducing a portion of the intake air from the intake valve hole 6 into the intake valve hole 6, the swirl generated in the intake valve hole 6 is inhibited, thereby weakening its strength.

The inlet 10 of the bypass passage 8 is provided with an on-off valve 12 as a swirl switching means 11 for opening and closing the inlet 10, a return spring 22 that biases the on-off valve 12 in the opening direction, and an air cylinder as its actuator. 13 is fixedly provided to the intake pipe 4. An air tank 15 is connected to the air cylinder 13 via an air pipe 14.
is connected to the air pipe 14, and a solenoid valve 16 for opening and closing the air pipe 14 is provided. A controller 17 is connected to the solenoid valve 16 to open and close the solenoid valve 16 in accordance with the engine speed and load to supply air into the air cylinder 13.

Now, the feature of the present invention is that the operating state of the on-off valve 12 that opens and closes the bypass passage 8 as the air passage 7 is detected and determined.

Therefore, a detection means 1 is installed in the air cylinder 13 and includes a limit switch or a lift sensor for detecting the opening/closing operation of the on-off valve 12.
8, and a determination circuit 19 for determining the operating status of the on-off valve 12 from the on-off signal from the detection means 18 and the control signal from the controller 17.

Specifically, when the on-off valve 12 is set by the controller 17 to a position where the air passage 7 is fully opened, the detection portion of the detection means 18 comes into contact with the stem end 12a of the on-off valve 12. A detecting means 18 is provided within the air cylinder 13 so as to close the opening/closing contact inside the air cylinder 13 when pressed. On the other hand, the discrimination circuit 19
is a first relay 20 with two circuits a and b contacts excited by the detection means 18, and the controller 17.
It consists of a second relay with two circuits a and b contacts which are excited by . The circuit configuration will be explained below.

One end of the exciting coil _L2 of the second relay 21 is connected to the controller 17 and the other end is grounded.
One end of the exciting coil _L1 of the first relay 20 is connected to a battery power supply 23, and the other end is grounded via the contact of the detection means 11.

The normally closed contact (b contact) 24 of the first relay 20, the normally closed contact (b contact) 26 of the second relay 21, and the first
The normally open contact (a contact) 25 of the relay 20 and the normally open contact (a contact) 27 of the second relay 21 are connected in series, and the normally open contact (a contact) of the first relay 20 is connected in series.
The positive sides of the contact) 25 and the normally closed contact (b contact) 24 are connected to the battery power supply 23, and the normally closed contact (b contact) 26 and the normally open contact (a contact) 27 of the second relay 21 are connected to the battery power supply 23.
The negative side of is grounded via the warning light 28.

Hereinafter, the operation of the present invention will be explained based on the accompanying drawings.

As shown in FIG. 1, when the solenoid valve 16 is opened by the control signal (ON) of the controller,
Working air is pumped from the air tank 15 into the air cylinder 13 via the air hose 14. By this air supply, the on-off valve 12 in the air cylinder 13 is operated in the direction of closing the air passage 7 against the return spring 22, thereby closing the inlet 10 of the air passage 7. Therefore, all the intake air passes through the intake port 3 and is guided to the intake valve hole 6.
Here, it is swirled and sucked into the cylinder 2. That is, the engine is set to high swirl.

Furthermore, when the solenoid valve 16 is closed by the control signal (OFF) of the controller 17, the operating air in the air cylinder 13 passes through the air hose 14 and is released from the solenoid valve 12 to the atmosphere. , and is pushed back by the return spring 22 to open the inlet 10 of the air passage 7.

As a result, part of the intake air in the intake port 3 is
This prevents the remainder of the intake air that is guided from the air passage 7 to the intake valve hole 6, passes through the air port 3, and is guided to the intake valve hole 6 from swirling. Therefore, the intake air drawn into the cylinder 2 is set to have a low swirl.

Now, the operation of the detection means 18 and the discrimination circuit 19 for detecting the operating state of the on-off valve 12 set to the above-mentioned high/low swirl will be explained.

When the on-off valve 12 is set to low swirl, the first relay 20 of the discrimination circuit 19 is turned off the control current, which is the control signal, so the second relay 21
Turn on the b contact 26 and turn off the a contact 27.
At this time, the on-off valve 12 opens the contact point of the detection means 18.
When turned ON, a current as an open signal is supplied from the detection means 18 to the first relay 20 of the discrimination circuit 19, turning the B contact 24 OFF and the A contact 25 ON. That is, the opening operation of the on-off valve 12 is performed normally,
Since the circuit between the first and second relays 20 and 21 is cut off, the warning light 28 does not light up, informing the driver that the operation of the on-off valve 12 is "normal".

Also, at this time, if the on-off valve 12 does not operate normally, the contact of the detection means 18 is turned OFF,
The current, which is the open signal to the second relay 20, is turned off. That is, the b contact 24 of the first relay 20
is ON, and the a contact 25 is OFF, so the first,
A current flows between the b contacts 24 and 26 of the second relays 20 and 21, lighting up the warning light 28 to warn the driver that the operation of the on-off valve 12 is "abnormal".

Next, a case where the on-off valve 12 is set to high swirl will be described.

When the on-off valve 12 is set to high swirl, a control current (ON) is supplied from the controller 17 to the second relay 21, and the B contact 26 of the second relay 21 is turned OFF and the A contact 27 is turned ON. . At this time, when the detection part 18a of the detection means 18 is separated from the stem end 12a of the on-off valve 12 and the contact is turned off, a close signal is sent to the first relay 20 indicating that it is not energized. . That is, the first
The b contact 24 of the relay 20 is turned on, and the a contact 25
is turned off, so the first and second relays 20, 2
The circuit between 1 and 2 is cut off, and the warning light 28 is not lit.
The driver is informed that the on-off valve 12 is normally closed and set to high swirl.

Also, at this time, if the on-off valve 12 does not operate normally, the contact of the detection means 18 is turned ON,
The first relay 20 is energized, the b contact 24 is OFF,
A contact 25 is turned on. Therefore, a current flows between the a contacts 25 and 27 of the first and second relays 20 and 21, lighting up the warning light 28 to warn the driver that the operation of the on-off valve 12 is "abnormal".

In this way, the detection means 18 and the discrimination circuit 19
Accordingly, it is possible to warn the driver whether the operation of the on-off valve 12 is "normal" or "abnormal", thereby improving the reliability of engine swirl control and the safety of the engine.

[Effects of the Invention] As is clear from the above explanation, the present invention can exhibit the following excellent effects.

(1) Malfunction of the on-off valve that switches the intake port to either high swirl or low swirl can be determined in both high swirl and low swirl using one discrimination circuit and one sensor, and control Reliability, institutional durability, safety,
Stability can be improved.

(2) Only one sensor (detection means) is required for the detection system input to the discrimination circuit, reducing costs.

(3) Abnormalities in on-off valves can be detected, increasing engine safety and reliability and improving quality.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a variable swirl port of the present invention, and FIG. 2 is a schematic sectional view showing a conventional example. In the figure, 1 is a cylinder head, 2 is a cylinder, 3 is an intake port, 4 is an intake pipe, 7 is an air passage, 12 is an on-off valve, 17 is a controller, 18 is a detection means, and 19 is a discrimination circuit.

Claims (1)

[Scope of utility model registration request] An air passage is provided connecting the downstream portion of the helical intake port and the intake pipe in order to switch the intensity of the intake swirl between high and low. an actuator valve that fully closes the inlet and switches the intake port to high swirl when the inlet is fully closed, and fully opens the inlet and switches the intake port to low swirl when the inlet is retracted to the maximum; A controller that outputs ON and OFF signals to switch between fully closed and fully open, and a controller that detects the stroke position of the on-off valve and turns the actuator valve ON when the inlet is fully open and when it is fully closed. Equipped with a sensor that turns OFF and a discrimination circuit that turns on a warning light when the sensor is ON and the controller is generating an ON signal, or when the sensor is OFF and the controller is generating an OFF signal. Variable swirl port.