CN-122003543-A - Idle air control valve

Abstract

The present invention provides an idle air control valve (30) comprising a housing (13), a spool assembly (3), a ball (9), a rotor assembly (4), a bushing (2), a pivot lock (5), a stator cup (1), wherein the bushing (2) is arranged such that it supports the improved rotor assembly (4) comprising a groove (17), and the bushing (2) comprises an extension (15) that sits above the spool assembly (3), and comprises a guide (16) that the guide (16) fits inside the inside diameter of the spool assembly (3) by a clearance fit, a transition fit, a press fit or by any other means including but not limited to welding, gluing, etc., the idle air control valve (30) provides a consistent airflow when the vehicle is idling, reduces ovality of the overall assembly, prevents motor immobilization, provides improved actuator efficiency and enhanced axial clearance.

Inventors

• Kabir Banari
• SANDEEP ANTIL
• Aftar Krichan Sharma

Assignees

• 帕德米尼VNA机电有限公司

Dates

Publication Date

20260508

Application Date

20241010

Priority Date

20231010

Claims (9)

1. 1. An idle air control valve (30), comprising: A housing (13), a terminal cover (12), a plurality of terminals (11), a wire spool assembly (3), a rotor assembly (4), at least one bushing (2), a pivot lock (5), a stator cup (1), a spring (7), a pivot (6), and an O-ring (14); Wherein: The at least one bushing (2) comprises an extension (15) located above the wire spool assembly (3) and comprises a guide (16), the guide (16) fitting inside the inner diameter of the wire spool assembly (3) such that the control of the rotor concentricity depends only on the wire spool assembly (3), and The at least one bushing (2) controls the axial clearance between the rotor assembly (4) and the spool assembly (3).
2. 2. The idle air control valve (30) of claim 1, wherein the guide (16) is fitted inside the inner diameter of the spool assembly (3) by at least one of a clearance fit, a transition fit, a press fit.
3. 3. The idle air control valve (30) of claim 1, wherein the bushing (2) has a top surface (2 a), the top surface (2 a) coinciding with the bottom surface (1 a) of the stator cup (1) and with the pivot lock (5) to avoid axial movement.
4. 4. The idle air control valve (30) of claim 1, wherein the control of concentricity of rotor assembly (4) depends on the spool assembly (3), whereby due to reduced ovality or roundness a uniform air flow is achieved in the idle air control valve (30), thereby increasing efficiency in the range of 25% to 35%.
5. 5. The idle air control valve (30) of claim 1, wherein the bushing (2) is at least one of circular, square, rectangular, and hexagonal.
6. 6. The idle air control valve (30) of claim 1, wherein the wire spool assembly (3) is provided with a plurality of terminals (11), a plurality of coils (8) are wound around the wire spool assembly (3) and the plurality of terminals (11) are covered via a terminal cover (12) and axially positioned for placement into the housing (13).
7. 7. Idle air control valve (30) according to claim 1, wherein the rotor assembly (4) is axially inserted into the spool assembly (3) and the bushing (10) is arranged to support axial movement towards the distal end of the rotor assembly (4) close to the bottom surface of the housing (13) and a ball (9) is placed in the bottom of the housing (13) to support rotational movement of the rotor assembly (4).
8. 8. Idle air control valve (30) according to claim 1, wherein the spring (7) is attached on an outer peripheral surface of the pivot lock (5) and is fixed by the pivot (6) axially covering the spring (7).
9. 9. Idle air control valve (30) according to claim 1, wherein the O-ring (14) is provided for a leak-proof connection between mating parts and the housing (13).

Description

Idle air control valve Technical Field The present invention relates to an idle air control valve. More particularly, the present invention relates to providing an idle air control valve having enhanced actuator efficiency, consistent airflow at vehicle idle, enhanced axial clearance, and reduced assembly complexity. Background Idle air control valves (commonly referred to as IACV) are used as electronically controlled linear actuators that play a critical role in managing airflow within an engine system. Its main function is to regulate the air amount and control the idle speed (RPM) of the engine. Typically, the component is located on the throttle body of a fuel injection engine. It operates under the command of a vehicle Engine Control Unit (ECU) and its position allows it to steer air around the throttle or directly manipulate the throttle. This operation involves regulating the airflow through a bypass circuit around the throttle to increase or decrease the idle speed of the engine. When the idle speed of the engine exceeds the limits of the predetermined range specified in the ECU programming, the engine control unit instructs the valve to adjust the bypass airflow accordingly. This precise control of the air and fuel ratio within the engine results in reduced emissions, thereby helping to reduce environmental pollution. Typically, idle air control valves are comprised of a variety of elements including, but not limited to, a set of wound coils, a stator, a rotor, a mechanism for facilitating linear movement of a pintle, power terminals, bushings, stator cups, and bobbins. These components are arranged in a complex manner in a complex design. During the assembly process, the bushing is typically pressed into the stator cup, and then the stator cup assembly is pressed into the wire bobbin assembly. However, assembling these components by pressing can present challenges (particularly in terms of maintaining precise concentricity of the bushing with respect to the inner diameter of the spool assembly). Therefore, ensuring concentricity of each part is critical because it can significantly impact performance. When this concentricity deviates from the prescribed requirement, it may cause rotational irregularities of the rotor assembly, causing it to assume an elliptical motion rather than the intended circular motion. Such deviations from the desired operation can result in a loss of actuator efficiency and increased noise and vibration due to uneven movement of the rotor assembly. Furthermore, in conventional air control valves, any molding defect on the shaft area may result in a resistance to smooth rotation of the motor or immobilization of the motor. CN105889573 discloses an air control valve installed in a pneumatic actuator. The air control valve includes a valve body in which a switching chamber and first, second and third passages communicating with the switching chamber, respectively, are provided, a first switching hole communicating with the switching chamber is formed in one end of the first passage, the other end of the first passage is an air source mounting hole, a communication hole communicating with the switching chamber is formed in one end of the second passage, the other end of the second passage is a non-spring chamber mounting hole, a second switching hole communicating with the switching chamber is formed in one end of the third passage, the other end of the third passage is a spring chamber mounting hole, a main valve element moving according to air pressure is arranged in the switching chamber, an exhaust passage communicating the second passage with the outside is arranged in the valve body, and a one-way circulation assembly allowing only gas to flow from the second passage to the outside is arranged in the exhaust passage. The main disadvantage of this invention is that it does not provide any solution to motor rotation irregularities or motor immobility due to moulding defects in the shaft area. WO2013181959 discloses a two-way air control valve comprising a valve body and a cylinder, wherein the valve body is provided with an inlet, an outlet and a movable valve core, a slidable piston is arranged inside the cylinder, the centre of the piston is connected with a piston rod, the piston rod can press the valve core to move so as to open/close a channel arranged between the inlet and the outlet, and an air control interface is arranged on the outer wall of the cylinder. The bi-directional air control valve is characterized in that a spacer bush is sleeved between the cylinder and the piston rod, one side of the spacer bush is fixedly connected to the valve body and the other side of the spacer bush is rotatably connected to the cylinder. The cylinder portion of the bi-directional air control valve is rotatable, providing convenience to the customer in installation during use, and extending the useful life of the gasket. The main disadvantage of this invention is that it does n