EGR valve with drive control

Abstract

The utility model discloses an EGR valve with a drive control function. The EGR valve comprises a valve body, a valve port, a valve rod, a valve plug and a drive control mechanism. The driving control mechanism is composed of a shell, a circuit board, a coil assembly, a position sensor, a rotating shaft, a transmission assembly and a reset torsion spring. The coil assembly is electrically connected with the circuit board through a conducting strip, a magnet disc is arranged in the middle of the rotating shaft, and S / N pole fan-shaped magnets are symmetrically distributed on the magnet disc; a fan-shaped copper wire winding of the coil assembly is electrified to generate a magnetic field to drive the magnet disc to rotate, the rotation is converted into linear motion of the valve rod through the hook plate-roller mechanism, and the valve plug is controlled to open and close the valve port. The position sensor feeds back position signals in real time, and precise control and quick return are achieved in combination with the reset torsion spring. The utility model has the advantages of fast response and high control precision, and is suitable for an engine exhaust recirculation system.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine exhaust gas recirculation system, concretely relates to a kind of EGR valve with drive control. BACKGROUND

[0002] EGR valve is an electromechanical integration product installed on diesel engine to control the amount of exhaust gas recirculation fed back to intake system. It is usually located on the right side of intake manifold, close to the throttle body, with a short metal pipe connected to the exhaust manifold. Its function is to control the amount of exhaust gas entering the intake manifold, so that a certain amount of exhaust gas flows into the intake manifold for recirculation. EGR valve is a very important and key component of exhaust gas recirculation device.

[0003] The opening of traditional EGR valve is directly driven by electromagnetic force to stretch and retract the valve rod, which has the problems of response delay, low control accuracy and susceptibility to electromagnetic interference, and lacks position feedback mechanism, making it difficult to accurately control the opening and closing of the valve port. UTILITY MODEL CONTENT

[0004] To solve the above problems, the purpose of the utility model is to provide an EGR valve with drive control, which realizes high-precision and fast-response valve port opening control through the composite structure of electromagnetic drive and mechanical transmission combined with position sensor feedback.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: an EGR valve with drive control, comprising a valve body, a valve port, a valve rod, a valve plug and a drive control mechanism; the valve plug is fixed to the end of the valve rod, and the valve rod is retractably arranged in the valve body; the drive control mechanism comprises a housing, a circuit board, a coil assembly, a position sensor, a rotating shaft, a transmission assembly and a return torsion spring; the coil assembly is electrically connected to the circuit board through a conductive sheet, the rotating shaft is rotatably arranged in the hollow position of the coil assembly, and a magnet disc is fixedly connected to the middle part of the rotating shaft; the position sensor is electrically connected to the circuit board and monitors the angle of the magnet disc; the magnet disc is symmetrically provided with a fan-shaped S pole and a fan-shaped N pole; two pairs of symmetric fan-shaped copper wire windings are arranged on the coil assembly; the fan-shaped copper wire windings generate magnetic poles after being energized and drive the magnet disc to rotate through the principle of magnetic pole repulsion; the return torsion spring is arranged between the rotating shaft and the housing; the rotating shaft and the valve rod are driven by the transmission assembly; the transmission assembly comprises a hook plate connected to the top end of the rotating shaft, and an arc-shaped hook strip is arranged on the hook plate; a through slot is arranged at the tail end of the valve rod, a roller is installed in the through slot, the hook strip passes through the through slot, and the roller is in contact with the side wall of the hook strip; the rotation of the rotating shaft drives the hook strip to rotate through the hook plate, and the hook strip drives the valve rod to stretch and retract through the hook roller, so as to control the opening and closing of the valve plug and the valve port on the valve rod.

[0006] The position sensor is a Hall sensor or a magneto-resistance sensor, which is used to detect the rotating angle of the magnet disc in real time.

[0007] The reset torsion spring is sleeved on the rotating shaft, and one end thereof abuts against the inner wall of the shell, and the other end thereof abuts against the rotating shaft.

[0008] The fan-shaped copper wire winding is four groups of symmetrically distributed coils, which generates a four-quadrant magnetic field to drive the directional rotation of the magnet disc after being electrified.

[0009] The utility model discloses the beneficial effect is: through electromagnetic-mechanical linkage structure, combine position feedback, realize valve port opening degree adjustment, response time is quick, and the anti-electromagnetic interference ability is strong, and the reliability is high.

[0010] The utility model will be further described below in combination with the drawings and specific embodiments. DRAWINGS

[0011] Figure 1 It is the perspective view of the specific embodiment of the utility model;

[0012] Figure 2 It is the sectional view of the specific embodiment of the utility model;

[0013] Figure 3 It is the partial perspective view in the specific embodiment of the utility model;

[0014] Figure 4 It is the structure diagram of the coil assembly in the specific embodiment of the utility model.

[0015] Reference signs: 1-valve body, 2-valve port, 3-valve rod, 4-valve plug, 5-driving control mechanism, 6-housing, 7-circuit board, 8-coil assembly, 9-position sensor, 10-rotating shaft, 11-transmission assembly, 12-reset torsion spring, 13-magnet disc, 14-fan-shaped copper wire winding, 15-hook plate, 16-hook strip, 17-insertion slot, 18-roller. EMBODIMENT

[0016] The utility model will be further described below in combination with the drawings and specific embodiments.

[0017] As Figure 1 — Figure 4As shown, the embodiment discloses an EGR valve with drive control, comprising a valve body 1, a valve port 2, a valve rod 3, a valve plug 4 and a drive control mechanism 5; the valve plug 4 is fixed to the end of the valve rod 3, and the valve rod 3 is telescopic in the valve body 1; the drive control mechanism 5 comprises a shell 6, a circuit board 7, a coil assembly 8, a position sensor 9, a rotating shaft 10, a transmission assembly 11 and a reset torsional spring 12; the shell is connected with the valve body, the coil assembly 8 is electrically connected with the circuit board 7 through a conductive sheet, the rotating shaft 10 is rotatably arranged in the hollow position of the coil assembly 8, and a magnet disc 13 is fixedly connected to the middle part of the rotating shaft 10; the position sensor 9 is electrically connected with the circuit board 7 and monitors the angle of the magnet disc 13; the magnet disc 13 is symmetrically provided with a fan-shaped S pole and a fan-shaped N pole, and S / N pole fan-shaped magnetic blocks (each occupying 90°) are symmetrically arranged on the surface of the magnet disc 13; the magnet disc 13 and the coil assembly 8 are close to each other, two pairs of symmetrical fan-shaped copper wire windings 14 are arranged on the coil assembly 8, and the fan-shaped copper wire windings 14 generate magnetic poles after being electrified and drive the magnet disc 13 to rotate through the principle of magnetic pole opposite attraction; the reset torsional spring 12 is arranged between the rotating shaft 10 and the shell 6; the transmission assembly 11 comprises a hook plate 15 connected to the top end of the rotating shaft 10, and an arc-shaped hook strip 16 is arranged on the hook plate 15; the tail end of the valve rod 3 is provided with a penetrating slot 17, a roller 18 is installed in the penetrating slot 17, the hook strip 16 penetrates through the penetrating slot 17, and the roller 18 is in contact with the side wall of the hook strip 16; the rotation of the rotating shaft 10 drives the hook strip 16 to rotate through the hook plate 15, the hook strip 16 drives the valve rod 3 to extend or retract through hooking and rolling the roller 18, so as to control the valve plug 4 on the valve rod 3 to realize opening and closing with the valve port 2.

[0018] The transmission assembly 11 is a gear set or a connecting rod mechanism, which is used for transmitting the rotary motion of the rotating shaft 10 to the valve rod 3.

[0019] The position sensor 9 is a Hall sensor or a magnetoresistance sensor, which is used for detecting the rotation angle of the magnet disc 13 in real time.

[0020] The reset torsional spring 12 is sleeved on the rotating shaft 10, one end of the reset torsional spring 12 abuts against the inner wall of the shell 6, and the other end abuts against the rotating shaft. In this way, the coil winding can be reset after being powered off.

[0021] The fan-shaped copper wire winding 14 is four groups of symmetrical coils, which generates a four-quadrant magnetic field (symmetrical S pole and N pole) to drive the magnet disc 13 to rotate directionally after being electrified.

[0022] Working principle: when the coil assembly 8 is powered, the magnetic field generated by the fan-shaped copper wire winding 14 interacts with the magnetic pole of the magnet disc 13, drives the rotating shaft 10 to rotate, the hook strip 16 pushes the valve rod 3 down through the hook roller 18, and the valve plug 4 seals the valve port 2; when power off, the reset torsional spring 12 drives the rotating shaft 10 to rotate reversely, the valve rod 3 moves up, and the valve plug 4 is separated from the valve port 2. The position sensor 9 collects the rotating angle signal of the rotating shaft 10 in real time and feeds back to the external controller to adjust the coil current, so as to realize accurate control of the opening degree.

[0023] After the above technical scheme is adopted, the following technical effects can be achieved: through the electromagnetic-mechanical linkage structure, combined with position feedback, the valve port opening degree adjustment is realized, the response time is rapid, the anti-electromagnetic interference ability is strong, and the reliability is high.

Claims

1. An EGR valve with drive control, comprising a valve body (1), a valve port (2), a valve rod (3), a valve plug (4) and a drive control mechanism (5); the valve plug (4) is fixed to the end of the valve rod (3), and the valve rod (3) is telescopically arranged in the valve body (1); characterized in that, The driving control mechanism (5) comprises a shell (6), a circuit board (7), a coil assembly (8), a position sensor (9), a rotating shaft (10), a transmission assembly (11) and a reset torsion spring (12); the coil assembly (8) is electrically connected with the circuit board (7) through a conductive sheet, the rotating shaft (10) is rotatably arranged in a hollow position of the coil assembly (8), a magnet disc (13) is fixedly connected to the middle part of the rotating shaft (10), the position sensor (9) is electrically connected with the circuit board (7) and monitors the angle of the magnet disc (13); the magnet disc (13) is symmetrically provided with a fan-shaped S-pole and a fan-shaped N-pole; the coil assembly (8) is provided with two pairs of symmetric fan-shaped copper wire windings (14), the fan-shaped copper wire windings (14) generate magnetic poles after being electrified and drive the magnet disc (13) to rotate through the principle of magnetic pole heterogeneity attraction; the reset torsion spring (12) is arranged between the rotating shaft (10) and the shell (6); the rotating shaft and the valve rod are driven through the transmission assembly.

2. The EGR valve with drive control according to claim 1, characterized in that The transmission assembly comprises a hook plate (15) connected to the top end of the rotating shaft (10), and the hook plate (15) is provided with an arc-shaped hook strip (16); the tail end of the valve rod (3) is provided with a penetrating slot (17), the penetrating slot (17) is provided with a roller (18), the hook strip (16) penetrates through the penetrating slot (17), and the roller (18) is in contact with the side wall of the hook strip (16); the rotation of the rotating shaft (10) drives the hook strip (16) to rotate through the hook plate (15), the hook strip (16) drives the valve rod (3) to stretch and retract through the hook roller (18), so that the valve plug (4) on the valve rod (3) and the valve port (2) are opened and closed.

3. The EGR valve with drive control of claim 1, wherein, The position sensor (9) is a Hall sensor or a magneto-resistance sensor, which is used for real-time detection of the rotation angle of the magnet disc (13).

4. The drive controlled EGR valve of claim 1, wherein, The reset torsion spring (12) is sleeved on the rotating shaft (10), one end of the reset torsion spring (12) abuts against the inner wall of the shell (6), and the other end abuts against the rotating shaft.

5. The drive controlled EGR valve of claim 1 wherein, The fan-shaped copper wire winding (14) is four groups of symmetrically distributed coils, which generate a four-quadrant magnetic field after being electrified to drive the magnet disc (13) to rotate in a direction.

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