JP2007046499A - Solenoid-driven valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solenoid-driven valve with increased controllability, specifically a rotary solenoid-driven valve with increased controllability used for an internal combustion engine and driven by an electromagnetic force and an elastic force. <P>SOLUTION: This solenoid-driven valve 1 comprises a drive valve 14 having a valve stem 12 and reciprocating along the extending direction of the valve stem 12, a disk 30 interlocking with the drive valve 14, extending from one end 32 to the other end 33, and swinging around a center axis 35 extending at the other end 33, a coil 62 swinging the disk 30, a power supply 200 supplying current to the coil 62, and an ECU 100 controlling the flow of current from the power supply 200 to the coil 62. When the disk 30 is initially driven, the ECU 100 controls the flow of current to periodically supply current from the power supply 200 to the coil 62. The ECU 100 controls the quantity and the length of the frequency of the current and the current value during the initial driving according to the voltage and the temperature. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates generally to an electromagnetically driven valve, and more particularly to a rotary electromagnetically driven valve used in an internal combustion engine and driven by electromagnetic force and elastic force.

Conventionally, an electromagnetically driven valve is disclosed in, for example, US Pat. No. 6,467,441 (Patent Document 1).
US Pat. No. 6,467,441

  The conventional technology has a problem that the sliding resistance is different between the low temperature and the high temperature, and the controllability is different. Furthermore, when holding the disk floating from the core with variable lift control, there is a problem that stable holding control cannot be performed if the coil current changes due to the influence of the battery voltage fluctuation due to the load.

  Accordingly, the present invention has been made to solve the above-described problems, and an object thereof is to provide an electromagnetically driven valve capable of stable driving.

  An electromagnetically driven valve according to one aspect of the present invention is an electromagnetically driven valve that operates by cooperation of electromagnetic force and elastic force, has a valve shaft, and reciprocates along a direction in which the valve shaft extends. Drive valve, swing member extending from one end linked to the drive valve to the other end, swinging about a central axis extending at the other end, coil swinging the swing member, and supplying current to the coil A power supply and a control unit that controls energization from the power supply to the coil are provided. When the swing member is initially driven, the control unit controls energization so that current is periodically supplied from the power source to the coil, and the control unit determines the number of cycles and the period of current during initial drive according to voltage and temperature. Control the length and current value.

  In the electromagnetically driven valve configured in this way, the control unit controls the number of current cycles, the length of the cycle, and the current value according to the voltage and temperature. By supplying a current, heat generation can be accelerated and controllability can be improved.

  An electromagnetically driven valve according to another aspect of the present invention is an electromagnetically driven valve that operates by cooperation of electromagnetic force and elastic force, has a valve shaft, and reciprocates along a direction in which the valve shaft extends. A drive valve, a swing member extending from one end linked to the drive valve to the other end, swinging about a central axis extending at the other end, an electromagnet core swinging the swing member, and a swing member A permanent magnet disposed on the outer peripheral side and disposed at a position where the magnetic flux passing through the swinging member and the core is increased.

  In the electromagnetically driven valve configured as described above, since the magnetic flux passing through the swing member and the core is increased, the power consumption when the intermediate lift is fixed can be reduced, and the influence of the voltage is less likely. As a result, it is possible to provide an electromagnetically driven valve capable of improving controllability and ensuring stable operation.

  According to the present invention, an electromagnetically driven valve that can ensure stable operation can be provided.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a sectional view of an electromagnetically driven valve according to Embodiment 1 of the present invention. Referring to FIG. 1, an electromagnetically driven valve 1 according to Embodiment 1 of the present invention is an electromagnetically driven valve that operates by cooperation of electromagnetic force and elastic force, and includes a valve stem 12 as a valve shaft. A drive valve 14 that reciprocates along the direction in which the valve stem 12 extends (arrow 10), and a central axis 35 that extends from one end 32 to the other end 33 and that extends at the other end 33, interlocked with the drive valve 14. A disk 30 as a swinging member, a coil 62,162 of the upper electromagnet 60 and the lower electromagnet 160 that swings the disk 30, a power supply 200 for supplying current to the coils 62,162, An ECU (electronic control unit) 100 is provided as a control unit that controls energization of the coils 62 and 162. When the disk 30 is initially driven, the ECU 100 controls energization so that current is periodically supplied from the power source 200 to the coils 62 and 162. The ECU 100 determines the number of current cycles during initial driving according to the voltage and temperature. Control the length of the period and the current value.

  The “U” -shaped housing 51 is a base member, and various elements are attached to the housing 51. Each of the upper electromagnet 60 and the lower electromagnet 160 includes cores 61 and 161 made of a magnetic material, and coils 62 and 162 wound around the cores 61 and 161. When the coils 62 and 162 are energized, a magnetic field is generated, and the disk 30 can be driven by the magnetic field. The disk 30 is disposed between the upper electromagnet 60 and the lower electromagnet 160 and is attracted to either one by the attraction force of the upper electromagnet 60 and the lower electromagnet 160. As a result, the disk 30 reciprocates between the upper electromagnet 60 and the lower electromagnet 160. The reciprocating motion of the disk 30 is transmitted to the stem 46 through the long hole 22 and the pin 21.

  The electromagnetically driven valve 1 in the present embodiment constitutes an intake / exhaust valve (intake valve or exhaust valve) of an internal combustion engine such as a gasoline engine or a diesel engine. In this embodiment, the case of a drive valve as an intake valve provided in the intake port 18 will be described, but the present invention may be applied to a drive valve as an exhaust valve.

  The electromagnetically driven valve 1 shown in FIG. 1 is a rotationally driven electromagnetically driven valve, and uses a disk 30 as its drive mechanism. The housing 51 is provided on the cylinder head 41, the lower electromagnet 160 is disposed on the side close to the cylinder head 41, and the upper electromagnet 60 is disposed on the side far from the cylinder head 41. A coil 62 constituting the upper electromagnet 60 and a coil 162 constituting the lower electromagnet 160 are connected by a wiring 202. Further, the coil 62 is connected to the power source 200 by a wiring 201, and the coil 162 is connected to the power source 200 by a wiring 203. That is, the coils 62 and 162 are connected in series with the power source 200.

  The disk 30 has an arm portion 31 and a bearing portion 38, and the arm portion 31 extends from one end 32 to the other end 33. The arm portion 31 is a member that is attracted by the upper electromagnet 60 and the upper electromagnet 60 and swings (turns) in the direction indicated by the arrow 30a. A bearing portion 38 is attached to an end portion of the arm portion 31, and the arm portion 31 rotates around the bearing portion 38. The upper surface of the arm portion 31 can contact the upper electromagnet 60, and the lower surface can contact the lower electromagnet 160.

  The bearing portion 38 has a cylindrical shape, and a torsion bar 36 is accommodated therein. A first end portion of the torsion bar 36 is fitted into the housing 51 by spline fitting, and the other end portion is fitted into the bearing portion 38. As a result, when the bearing portion 38 tries to rotate, a force against the rotation is applied from the torsion bar 36 to the bearing portion 38. Therefore, the bearing portion 38 is always positioned in a neutral state. At one end 32, a stem 46 is provided so as to receive a force from the disk 30, and the stem 46 is guided by a stem guide 45. The stem 46 and the disk 30 can swing in the direction indicated by the arrow 30a.

  On the other end 33 side, the convex portion 52 is provided in the housing 51, and the other end 33 is accommodated in the convex portion 52. A bearing 59 is disposed between the bearing portion 38 and the convex portion 52 of the housing 51.

  An intake port 18 is provided below the cylinder head 41. The intake port 18 is a path for introducing intake air into the combustion chamber, and the air-fuel mixture or air passes through the intake port 18. A valve seat 42 is provided between the intake port 18 and the combustion chamber, and the valve seat 42 can improve the sealing performance of the drive valve 14.

  A drive valve 14 as an intake valve is attached to the cylinder head 41. The drive valve 14 includes a valve stem 12 extending in the longitudinal direction and an umbrella portion 13 attached to an end of the valve stem 12. The valve stem 12 is guided by a stem guide 43. A spring retainer 19 is fitted on the valve stem 12. The spring retainer 19 is biased upward by the valve spring 17. For this reason, the spring retainer 19 and the valve stem 12 are urged by the valve spring 17.

  The energization from the power source 200 to the coils 62 and 162 is controlled by the ECU 100. ECU 100 obtains temperature information and voltage information from temperature sensor 102 and voltage sensor 101. The voltage sensor 101 monitors the voltage of the power source 200. The temperature sensor 102 detects the temperature (water temperature, outside air temperature, or temperature of the electromagnetically driven valve 1). A storage unit 104 is connected to the ECU 100, and the storage unit 104 stores various map data related to the period of current flowing through the coils 62 and 162, the magnitude of the current, and the like.

  FIG. 2 is a circuit diagram of the electromagnetically driven valve shown in FIG. Referring to FIG. 2, two coils 62 and 162 are connected in series to power supply 200. In this embodiment, an example in which two upper and lower electromagnets 60 and 160 are provided has been described. However, the present invention is not limited to this, and more electromagnets may be provided.

  FIG. 3 is a graph showing the relationship between the valve lift and the current during the initial drive. FIG. 4 is a cross-sectional view of the electromagnetically driven valve showing the neutral position. FIG. 5 is a cross-sectional view of the electromagnetically driven valve showing a valve closing state. Referring to FIGS. 1 to 5, first, in the neutral state, as shown in FIG. 4, the arm portion 31 of the disk 30 is positioned between the upper electromagnet 60 and the lower electromagnet 160. In this state, time t10 in FIG. 3 is reached, and the current I flows through the coils 62 and 162 until time t11. Then, since the distance between the arm part 31 and the upper electromagnet 60 is slightly shorter than the distance between the arm part 31 and the lower electromagnet 160, a large force acts between the arm part 31 and the upper electromagnet 60, and time t11. Then, the drive valve 14 moves from “neutral” in FIG. 3 toward “closed valve”.

  At time t11, the current is decreased. A downward twisting force is applied to the arm 31 once moved upward by the torsion bar 36. Therefore, the arm portion 31 moves downward, stops when it moves downward from the neutral point, and further moves upward. When the upward movement starts, the coils 62 and 162 are energized again, and the arm portion 31 is greatly attracted upward. This reciprocating motion is repeated over periods 1 to 3. In this way, the drive valve 14 gradually increases in amplitude and finally closes. At this time, the period of the current in the initial drive (cycle 1 to cycle 3 in FIG. 3) is controlled.

  After the valve is closed as shown in FIG. 5, the arm portion 31 can be held by the upper electromagnet 60 by flowing a small holding current through the coil 62.

  The period shown in FIG. 3 is appropriately changed depending on the voltage and temperature. FIG. 6 is a graph of a current map when temperature and voltage change. FIG. 7 is a graph of a periodic length map when temperature and voltage change. FIG. 8 is a graph of a cycle number map when the temperature and voltage change. Referring to FIG. 6, temperature and voltage are measured by temperature sensor 102 and voltage sensor 101 in FIG. Based on this temperature and voltage, ECU 100 calculates a current value suitable for initial driving from the current map of FIG. For example, if the temperature at the initial drive is between T2 and T3 and the voltage is a value between V3 and V4, the current for the initial drive is the current required from the four current values I23, I33, I24 and I34. Calculate the value. Referring to FIG. 7, ECU 100 measures the length of each cycle from the cycle length map of FIG. In the case of the above-described temperature and voltage conditions, the ECU 100 calculates the cycle length based on the cycle lengths L23, L33, L24, and L34 from the cycle map length.

  Further, ECU 100 calculates the number of cycles from the cycle number map of FIG. In the case of the temperature and voltage conditions described above, ECU 100 calculates the number of periods from the number of periods N23, N33, N24, and N34. The map data shown in FIGS. 6 to 8 is stored in the storage unit 104, and the ECU 100 can always access the storage unit 104.

  That is, in the present invention, the current, cycle, and number of cycles for initial driving are mapped by temperature and voltage, and monitor values of each sensor of temperature and voltage are input to perform map adaptation control. In particular, at an extremely low temperature with high sliding resistance, the normal overcurrent set value is instantaneously increased. This raising amount is larger than that during normal operation when the temperature difference to the heat generation limit of the coils 62 and 162 is extremely low. The increased temperature difference is set to be equal to the coil heat generation temperature due to the raised current value. In addition, the number of initial driving times at a very low temperature is set to a temperature at which the temperature of the actuator sufficiently rises so as to reduce the high sliding resistance to the level of sliding resistance during normal operation. That is, energization control is performed to heat the upper and lower electromagnets 60 and 160. With the electromagnetically driven valve configured as described above, the heat generation of the electromagnetically driven valve 1 can be accelerated and the controllability can be improved at a low temperature with a large sliding resistance.

(Embodiment 2)
FIG. 9 is a sectional view of an electromagnetically driven valve according to Embodiment 2 of the present invention. Referring to FIG. 9, in electromagnetically driven valve 1 according to the second embodiment of the present invention, permanent magnet 300 is provided on one end 32 side of arm portion 31. The permanent magnet 300 is positioned away from the core 61, so that the arm portion 31 is also held at a position where it does not directly contact the core 61. That is, the electromagnetically driven valve 1 according to the second embodiment is an electromagnetically driven valve that operates by cooperation of electromagnetic force and elastic force, and has a valve stem 12 and reciprocates along the direction in which the valve stem 12 extends. A drive valve 14 that moves, a disk 30 that swings from a first end 32 that interlocks with the drive valve 14 to the other end 33, swings about a central axis 35 that extends at the other end 33, and an upper electromagnet 60 that swings the disk 30. And a permanent magnet 300 disposed on the outer peripheral side of the disk 30 and disposed at a position where the magnetic flux in the direction indicated by the arrow 301 passing through the disk 30 and the core 61 increases. In this embodiment, the lift amount of the drive valve 14 is variable, and the permanent magnet 300 is disposed on the outer periphery of the disk 30 in order to reduce the current (power consumption) when the disk 30 is held floating from the core 61. ing. The position of the permanent magnet 300 is a position away from the core 61 and close to the one end 32 of the arm portion 31 but is not in direct contact with the arm portion 31. By providing such a permanent magnet 300, the flow of magnetic flux by the permanent magnet indicated by the arrow 301 is increased. As a result, it is possible to reduce the power consumption when the intermediate lift is fixed, and it is possible to provide the electromagnetically driven valve 1 that is less affected by the voltage and has high controllability.

  Although the embodiment of the present invention has been described above, the embodiment shown here can be variously modified. The electromagnetically driven valve shown in the present invention is not limited to one driven by one disk, and two parallel disks may be provided, and an electromagnet may be disposed between them.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention can be used, for example, in the field of an electromagnetically driven valve for an internal combustion engine mounted on a vehicle.

It is sectional drawing of the electromagnetically driven valve according to Embodiment 1 of this invention. It is a circuit diagram of the electromagnetically driven valve shown in FIG. It is a graph which shows the relationship between the electric current at the time of initial stage drive, and a valve lift. It is sectional drawing of the electromagnetically driven valve which shows a neutral position. It is sectional drawing of the electromagnetically driven valve which shows a valve closing state. It is a graph of the current map when temperature and voltage change. It is a graph of a period length map when temperature and voltage change. It is a graph of cycle number map when temperature and voltage change It is sectional drawing of the electromagnetically driven valve according to Embodiment 2 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Electromagnetic drive valve, 12 stem, 13 umbrella part, 14 drive valve, 30 disc, 32 one end, 33 other end, 35 central axis, 100 ECU, 200 power supply.

Claims (2)

An electromagnetically driven valve that operates in cooperation with electromagnetic force and elastic force,
A drive valve having a valve shaft and reciprocating along a direction in which the valve shaft extends;
A swinging member extending from one end linked to the drive valve to the other end and swinging about a central axis extending at the other end;
A coil for swinging the swing member;
A power supply for supplying current to the coil;
A controller that controls energization of the coil from the power source,
When the swing member is initially driven, the control unit controls energization so that a current is periodically supplied from the power source to the coil, and the control unit determines the current during the initial drive according to the voltage and temperature. An electromagnetically driven valve that controls the number of cycles, the length of the cycle, and the current value. An electromagnetically driven valve that operates in cooperation with electromagnetic force and elastic force,
A drive valve having a valve shaft and reciprocating along a direction in which the valve shaft extends;
A swinging member extending from one end linked to the drive valve to the other end and swinging about a central axis extending at the other end;
An electromagnet core for swinging the swing member;
An electromagnetically driven valve comprising: a permanent magnet provided on an outer peripheral side of the swing member and disposed at a position where a magnetic flux passing through the swing member and the core is increased.

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