KR19980027209A - Valve switchgear for internal combustion engine - Google Patents

Abstract

In order to adjust the valve opening and closing time to the optimum state according to the engine speed and load, the vehicle speed and cooling water temperature change, and to adjust the valve lift amount to the optimum state for improving the torque performance and low emission, Sensing means for detecting engine load, vehicle speed, and coolant temperature, opening and closing the valve and adjusting valve opening / closing time to optimize engine speed, engine load, vehicle speed, and coolant temperature, and improve torque performance and low emission. And an actuator for adjusting the lift amount of the valve in an optimal state, and an electronic control unit (ECU) for receiving the detection signal of the sensing means and controlling the actuator in the optimal state as described above.

Description

Valve switchgear for internal combustion engine

The present invention relates to a valve opening and closing device for an internal combustion engine, and more particularly, in order to continuously adjust the valve opening and closing time according to the engine speed and load, and to change the vehicle speed and cooling water temperature, and to improve torque performance and low emission. It relates to a valve opening and closing device for an internal combustion engine for adjusting the amount.

Generally, an internal combustion engine burns a mixture of air and fuel in a combustion chamber to convert the chemical energy of the fuel into thermal energy, and an intake / exhaust device that controls the control of the mixture and the combustion gas to convert the thermal energy into kinetic energy. Equipped.

This intake / exhaust device includes a valve open / close device for opening / closing an intake / exhaust valve mounted on the upper cylinder head of the combustion chamber, and the valve open / close device generally uses a cam that rotates in correlation with the crankshaft.

However, since the valve opening and closing device for the internal combustion engine as described above mechanically connects the cam and the crankshaft, the correlation between the crankshaft and the valve opening and closing time is uniform, and the amount of lift for opening the valve is constant because the cam eccentricity is fixed.

Therefore, the valve opening and closing device for the internal combustion engine makes it difficult to properly adjust the valve opening and closing timing according to the engine speed, load, and vehicle speed coolant temperature change, and to properly adjust the valve lift amount to improve torque performance and low emission. There is a disadvantage.

Therefore, the present invention has been invented to solve the above problems, the object of the present invention is to adjust the valve opening and closing time to the optimum state according to the engine speed and load and the vehicle speed cooling water temperature changes, and the valve lift amount torque It is to provide a valve opening and closing device for an internal combustion engine that adjusts performance and low emission to an optimal state for improvement.

In order to realize this, the internal combustion valve opening and closing device according to the present invention has a means for detecting the engine speed, the engine load, the vehicle speed, the coolant temperature, opening and closing the valve and at the same time the engine speed, the engine load, the vehicle speed, and the coolant temperature. Actuator to adjust the opening and closing time of the valve in the optimal state, the actuator to adjust the lift amount of the valve in the optimal state to improve the torque performance, low emission, and control the actuator to the optimum state by receiving the detection signal of the sensing means Includes an electronic control unit (ECU).

The sensing means includes a rotation speed sensor for detecting the engine speed, a load sensor for detecting the engine load, a vehicle speed sensor for detecting the vehicle speed, and a water temperature sensor for sensing the temperature of the coolant.

The actuator is a hydraulic cylinder for opening and closing the valve by the hydraulic pressure supplied from the hydraulic circuit, a timing control solenoid for adjusting the opening and closing time of the valve by the control signal of the electronic control unit when the valve is opened and closed by the hydraulic pressure supplied to the hydraulic cylinder, It includes a lift control solenoid for adjusting the opening and closing amount of the valve by the control signal of the electronic control unit when the valve is opened and closed by the hydraulic pressure supplied to the hydraulic cylinder.

One side of the valve stem is connected to the piston of the hydraulic cylinder.

The hydraulic cylinder forms two damping chambers in order to prevent noise generated by opening and closing the valve at the upper and lower sides of the piston when the valve is opened and closed by hydraulic pressure supplied / discharged.

The lift control solenoid is characterized by controlling the valve lift amount by controlling the discharge of the hydraulic pressure supplied to the hydraulic cylinder.

The valve opening and closing device for the internal combustion engine configured as described above inputs the signal detected by the sensing means to the electronic control unit, and the electronic control unit determines the driving state of the vehicle to operate the actuator, so that the valve opening and closing timing is optimal for the driving state of the vehicle. And adjust the valve lift.

BEST MODE Hereinafter, preferred configurations and operations of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram schematically showing a valve opening and closing apparatus for an internal combustion engine according to the present invention.

2 is a partial cross-sectional view of a cylinder head to which an internal combustion engine or a valve opening and closing apparatus according to the present invention is mounted.

1 is a block diagram schematically illustrating a valve opening and closing device for an internal combustion engine according to the present invention, in which an electronic control unit (ECU) receiving a detection signal of a sensing means opens and closes a valve of an intake / exhaust device, The actuator which controls the lift amount is comprised.

The detection means includes a rotation speed sensor S1 for detecting the rotational speed of the engine, a load sensor S2 for detecting the load of the engine, a vehicle speed sensor S3 for detecting the running speed of the vehicle, and a water temperature for detecting the temperature of the coolant. Sensor S4, which is connected to an input of an electronic control unit ECU.

In this way, the electronic control unit (ECU), which receives the detection signal from each of the sensors S1, 2, 3, and 4 of the sensing means, is connected to its output terminal to open and close the valve, and to control the opening and closing time and the lift amount. To control.

As shown in Fig. 2, the actuator is operated by the hydraulic pressure supplied from the hydraulic circuit to control the opening and closing of the valve 5 installed in the intake / exhaust pipe 3 formed in the cylinder head 1 (7). ) And the lift control solenoid A2 for adjusting the lift amount L of the timing control solenoid A1 for controlling the opening and closing timing of the valve 5 opened and closed by the hydraulic cylinder 7 and the valve 5 for opening and closing. ).

The hydraulic circuit pumps oil from the oil pan 9 to the oil pump 11 to supply the hydraulic cylinder 7 through the conduit 13, and returns the oil pressure controlling the valve 5 to the oil pan 9. It is configured to be.

That is, a relief valve for supplying oil of a predetermined pressure to the oil filter 15 for filtering foreign substances contained in the oil in the pipeline 13 of the hydraulic circuit and the pipeline 13 and returning the remaining oil to the oil pen 9. (17), the check valve 19 which prevents oil from being arrested, and the accumulator 21 which reduces the wave of the hydraulic pressure supplied to the conduit 13, and enables stable hydraulic supply are provided.

And the hydraulic pressure supplied from the accumulator 21 is supplied to the hydraulic cylinder (7), the hydraulic cylinder (7) is a valve (5) to the piston 23 to open and close the valve (5) by the hydraulic pressure Install the tip of the stamp.

In addition, the hydraulic cylinder 7 forms damping chambers 25 and 27 on the upper and lower sides in order to prevent the noise generated when the valve 5 is opened and closed and hits the upper and lower ends of the hydraulic cylinder 7 with the piston 23.

The damping chamber 25 is a space formed by the upper surface of the piston 23 and the upper inner surface of the hydraulic cylinder 7 when the valve 5 is closed, and the damping chamber 27 is a piston when the valve 5 is heated. It means the space which the lower surface of 23 and the upper surface of lower side of the hydraulic cylinder 7 form.

In addition, an orifice 29 that is an oil passage is formed at one side of the piston 23 of the hydraulic cylinder 7 so as to supply and discharge the hydraulic pressure to the damping chambers 25 and 27.

The upper damping chamber 25 supplied with the hydraulic pressure through the orifice 29 is connected to the pipeline 11 and the bypass pipeline 31 supplied through the accumulator 21. In addition, the bypass pipe 31 is provided with a check valve 33 which enables hydraulic supply from the damping chamber 25 to the pipe line 13 and cannot supply in the reverse direction, and passes through the bypass pipe 31. An orifice 35 for controlling the flow rate is formed.

The oil outlet 37 of the hydraulic cylinder 7 is formed at a position that can be blocked by the side of the piston 23 when the valve 5 is opened, and the oil discharged is returned to the oil pen 9. It is connected to the oil pen (9) by a pipe (13) so that it can be.

The hydraulic pressure supplied from the oil pump 11 to the hydraulic cylinder 7 via the hydraulic circuit as described above is controlled by the timing control solenoid A1 and the lift control solenoid A2 so that the valve 5 can be controlled. The timing control solenoid A1 and the lift control solenoid A2 are provided in the cylinder head 1.

That is, the timing control solenoid A1 is mounted on the top of the valve stem and pulls the piston 23 via the elastic spring 39 to open the valve 5 by the lift amount L so as to open the hydraulic cylinder 7. It is installed on the lower side and operates according to the control signal of the electronic control unit (ECU). This timing control solenoid (A1) is to be opened and closed by adjusting the opening and closing time of the valve (5), it is provided in the lower side of the hydraulic cylinder (7) as in this configuration, but the above operation even if installed on the upper side Irrelevant

The lift control solenoid A2 intersects the flow rate discharged in the hydraulic cylinder 7 when the piston 7 of the hydraulic cylinder 7 moves downward while overcoming the elastic force of the elastic spring 39. It is installed on the discharge port 37 side so as to be controlled by one needle 43 is operated by the control signal of the electronic control unit (ECU).

Each sensor (S1, 2, 3, 4) of the sensing means applies each sensing data to the input terminal of the electronic control unit (ECU) when driving in a vehicle having a valve opening and closing device for an internal combustion engine configured as described above.

The ECU controls the timing control solenoid A1 and the lift control solenoid A2 of the engine and the vehicle by combining the respective data and determining the valve opening / closing time and the lift amount by comparing the data with the pre-inputted program or map data. Control to the optimum running state.

That is, the electronic control unit ECU supplies the current to the timing control solenoid A1 to overcome the elastic force of the elastic spring 39 and pulls the piston 23 to draw the valve 5 by the lift amount L. Open it.

At this time, the damping chamber 27 prevents the lower surface of the piston 23 from colliding with the lower inner surface of the hydraulic cylinder, and the elastic spring 39 prevents the valve 5 from being suddenly opened. The hydraulic pressure is supplied to the damping chamber 25 through the orifice 29 formed in the piston 23, and continuously during engine operation by the amount of oil in the damping chamber 27 due to the opening and closing frequency of the lift control solenoid valve A2. The lift amount L is varied.

When the electronic control unit ECU cuts off the current supplied to the timing control solenoid A1, the piston 23 and the valve 5 mounted thereon retreat by the holding force of the elastic spring 39 to close the intake and exhaust ports. Let's do it.

In this case, the damping chamber 25 prevents the upper surface of the piston 23 from colliding with the upper surface of the hydraulic cylinder. The oil in the damping chamber 25 is discharged through the orifice 29 or discharged into the conduit 13 through the orifice 35 and the check valve 33 installed in the bypass conduit 31 to enable the above operation. .

As described above, when the valve 5 is opened and closed by adjusting the opening / closing time of the valve 5 by the timing control solenoid A1, the lift control solenoid A2 corresponds to the driving state of the engine and the vehicle at the same time. The lift amount L of the valve 5 is adjusted by the electronic control unit ECU.

That is, the electronic control unit ECU supplies a current to the lift control solenoid A2 to move the needle 43 by an interaction force with the elastic force of the elastic spring 41 to discharge the outlet 37 of the hydraulic cylinder 7. Control the size of) to control the discharge flow rate.

Therefore, the flow rate discharge in the hydraulic cylinder 7 is controlled as described above, thereby controlling the lift amount L of the valve 5 by adjusting the volume of the damping chamber 27.

As described above, the valve opening and closing apparatus for the internal combustion engine according to the present invention inputs a signal sensed by the sensing means to the electronic control unit, and the electronic control unit determines the driving state of the vehicle to operate the actuator, thereby optimizing the driving state of the vehicle, that is, the engine. The valve opening and closing time can be properly adjusted according to the rotational speed, load, and vehicle speed and cooling water temperature change, and the valve lift amount can be appropriately adjusted to improve torque performance and low emission.

In addition, the present invention can be applied to a lean continuous engine because it controls the lift amount and the valve opening and closing timing of the valve, the structure is simplified by removing the cam system and the throttle valve, and the braking performance and fuel efficiency can be improved by reducing the friction part.

In addition, the present invention can improve the torque performance by increasing the air inflow by increasing the inflow of air by limiting the cam profile by continuous control of the valve opening and closing time and the lift amount.

Claims (6)

Sensing means for detecting engine speed, engine load, vehicle speed, and coolant temperature, opening and closing the valve and adjusting valve opening / closing time in optimum condition for engine speed, engine load, vehicle speed, and coolant temperature, torque performance, low Actuator for adjusting the lift amount of the valve in the optimum state for improvement of the emission, Valve opening and closing device for an internal combustion engine including an electronic control unit (ECU) for receiving the detection signal of the sensing means to control the actuator in the optimum state as described above . The valve opening and closing device of claim 1, wherein the sensing unit includes a rotational speed sensor that senses engine speed, a load sensor that senses an engine load, a vehicle speed sensor that senses a vehicle speed, and a water temperature sensor that senses a temperature of the coolant. . According to claim 1, the actuator is a hydraulic cylinder for opening and closing the valve by the hydraulic pressure supplied from the hydraulic circuit, when the valve is opened and closed by the hydraulic pressure supplied to the hydraulic cylinder to adjust the opening and closing time of the valve by the control signal of the electronic control unit And a timing control solenoid, and a lift control solenoid for controlling the opening and closing amount of the valve by a control signal of an electronic control unit when the valve is opened and closed by the hydraulic pressure supplied to the hydraulic cylinder. The valve opening and closing device for an internal combustion engine according to claim 3, wherein one side of the valve stem is connected to the piston of the hydraulic cylinder. 4. The valve opening and closing device for an internal combustion engine according to claim 3, wherein the hydraulic cylinder includes two damping chambers formed to prevent noise generated by opening and closing the valve at the upper and lower sides of the piston when the valve is opened and closed by a supply / discharged molten bar. 4. The valve opening and closing device for an internal combustion engine according to claim 3, wherein the lift control solenoid controls the valve lift amount by controlling the discharge of the hydraulic pressure supplied to the hydraulic cylinder.