CN108167067A - Turbocharger electronic actuators and installation method - Google Patents

Abstract

The invention discloses an electronic actuator for a turbocharger and an installation method thereof. The actuator includes an upper casing and a lower casing, an output crankshaft is rotatably connected to the lower casing, and a worm and a driving motor are rotatably arranged in a sealed storage cavity. A sector gear is fixedly installed on the output crankshaft, and a circular magnet is arranged at the other end of the output crankshaft. A circuit board is also arranged in the storage cavity, and a position detection chip is arranged on the circuit board. Groove, the outer side of the connecting end of the upper shell is provided with an elastic flange, the connecting end of the lower shell is provided with a socket, and a hollow rubber protrusion is arranged in the slot, and the top of the hollow rubber protrusion forms a circular arc depression , the end of the plug-in part has an arc protrusion that matches the arc recess, and the central angle of the arc recess is greater than 180°. Since the upper shell and the lower shell are detachably connected, it can be easily maintained. Replacement of internal parts, and has a good airtight structure.

Description

Electronic actuator for turbocharger and installation method

technical field

The invention relates to an electronic actuator, in particular to an electronic actuator for a turbocharger and an installation method.

Background technique

At present, the variable section control of the turbocharger is to control the pneumatic actuator to drive the nozzle ring through the pressure after boosting, thereby changing the flow characteristics of the turbocharger. The engine management system calculates the required target boost pressure according to the pressure after boost, air flow, throttle opening, etc., and then converts it into a control command for the pneumatic actuator to control the opening or closing of the pneumatic actuator. However, with the emission regulations Strict, precise control requirements for automotive electronics highlight the disadvantages of pneumatic actuators, lagging action, inaccurate control, and inability to feedback position. In this way, it is difficult to precisely control the supercharger, improve the response speed of the supercharger, reduce hysteresis, improve power and reduce emissions. In addition, with the increase of the service life, the control accuracy will be further reduced due to the aging of the diaphragm.

Although there are electronic actuators driven by motors in the prior art, such as the application number: 201610588853.0, which discloses a turbocharged electronic actuator and its installation method, but after the actuator shell is installed, laser welding is used. Due to the mechanical drive mode, its internal parts are easy to wear and tear. In the above structure, because the outer shell is fixed, it cannot be disassembled and maintained. When a fault occurs, it can only be replaced, which greatly increases the cost.

Contents of the invention

The purpose of the present invention is to overcome the disadvantages of the above-mentioned technologies, thereby providing an electronic actuator for a turbocharger, which can be disassembled for maintenance and parts replacement.

The technical scheme adopted by the invention is as follows: the electronic actuator for turbocharger includes an upper casing and a lower casing matched with the upper casing, and a gap is formed between the upper casing and the lower casing. A sealed storage chamber, the lower housing is rotatably connected with an output crankshaft, the output end of the output crankshaft drives the nozzle ring or the waste gas bypass valve through a connecting rod, and a worm is installed in the sealed storage chamber to drive the A driving motor for the worm rotation, the output crankshaft is fixedly provided with a sector gear meshing with the worm, the other end of the output crankshaft is provided with a circular magnet, and a circuit board is also provided in the storage cavity, and the A position detection chip is arranged on the circuit board, the position chip is arranged concentrically with the circular magnet, and an external interface is also provided on the upper casing, and the external interface includes a motor drive positive terminal interface and a motor drive negative terminal interface , a power supply interface and a ground interface, the motor drive positive terminal interface and the motor drive negative terminal interface are driven by the engine ECU through the H bridge, the power supply interface is connected to the signal power provided by the engine ECU, and the ground interface is connected to the engine The ground phase provided by the ECU is connected, and the position chip is connected to the engine ECU. It is characterized in that: the upper case is disassembled from the lower case, and the connection end of the upper case is provided with A plurality of slots, the outer side of the connection end of the upper case is provided with elastic flanges, the connection end of the lower case is provided with a plug-in part matching with the slots, the lower case The connecting end is fixedly connected with the elastic flange through several fasteners, and a hollow rubber protrusion is arranged in the slot, and the top of the hollow rubber protrusion forms a circular arc depression, and the end of the insertion part The part has an arc protrusion matched with the arc recess, and the central angle of the arc recess is larger than 180°.

A further improvement is: a transmission mechanism is provided between the output crankshaft of the drive motor and the worm, and the transmission mechanism is a gear transmission mechanism.

A further improvement is: the output crankshaft is rotatably connected to the lower housing through an airtight bearing.

A further improvement is: the position chip is a Hall effect sensor chip.

A further improvement is that: the external interface is integrally formed with the upper casing.

A further improvement is that: the sector gear is fitted with the output crankshaft through a key.

The purpose of the present invention is to overcome the above technical deficiencies, thereby providing a method for installing an electronic actuator for a turbocharger.

The technical scheme adopted in the invention is as follows: the installation method of the electronic actuator for the turbocharger comprises the following steps:

(1) Install the output crankshaft; install the sector gear on the output crankshaft through key fit, fix the magnet to one end of the output crankshaft through a laser welding machine, and install the output crankshaft in the lower casing through an airtight bearing;

(2) Installation of the driving mechanism, manually install the driving motor, and lock it with self-tapping screws, install the worm on the lower casing through the rotating bearing, and cooperate with the sector gear, and install it between the output crankshaft of the driving motor and the worm gear transmission mechanism;

(3), circuit board installation, according to the position of the magnet, the circuit board is fixed on the upper shell through self-tapping screws;

(4) Shell installation, manually cover the upper shell and the lower shell, the slot on the upper shell corresponds to the socket on the lower shell, and connect the elastic flange on the upper shell to the lower shell The body is fixed by several self-tapping screws;

(5), air tightness testing and performance testing;

(6), packaging, coding, storage.

By adopting the aforementioned technical solution, the beneficial effects of the present invention are: due to the detachable connection between the upper casing and the lower casing, maintenance and replacement of internal parts can be facilitated, and in addition, due to the high airtightness requirements of the actuator, A hollow rubber protrusion is set in the slot of the upper case, and an inserting part matched with the hollow rubber protrusion is arranged on the lower case, so as to form an airtight structure, which not only makes the upper case and the lower case stably connected , and good air tightness, but also has a good dust-proof effect, no need to set up a dust cover.

Description of drawings

Fig. 1 is an exploded view of the present invention;

Fig. 2 is a sectional view of the present invention;

Fig. 3 is an enlarged view of A in Fig. 2 .

In the figure, 1. Upper housing; 2. Lower housing; 3. Output crankshaft; 4. Worm; 5. Driving motor; 6. Sector gear; 7. Magnet; 8. Circuit board; 9. Gear transmission structure; 10 , slot; 11, elastic flanging; 12, socket part; 13, hollow rubber protrusion; 14, arc depression; 15, arc protrusion.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1-3, the present invention discloses an electronic actuator for a turbocharger, comprising an upper housing 1, a lower housing 2 matched with the upper housing 1, the upper housing 1 and the A sealed accommodation cavity is formed between the lower casings 2, and an output crankshaft 3 is rotatably connected to the lower casing 2, and the output end of the output crankshaft 3 drives the nozzle ring or the waste gas bypass valve through a connecting rod. A worm 4 and a driving motor 5 for driving the worm 4 are rotated in the sealed housing cavity, and a sector gear 6 meshing with the worm 4 is fixedly arranged on the output crankshaft 3 , and the other end of the output crankshaft 3 A circular magnet 7 is provided, and a circuit board 8 is also provided in the accommodating cavity, and a position detection chip is provided on the circuit board 8, and the position detection chip is arranged concentrically with the circular magnet 7, and the upper housing 1 is also provided with an external interface, the external interface includes a motor drive positive terminal interface, a motor drive negative terminal interface, a power supply interface and a ground interface, and the motor drive positive terminal interface and the motor drive negative terminal interface are passed by the engine ECU H-bridge driving, the power interface is connected to the signal power provided by the engine ECU, the ground interface is connected to the ground provided by the engine ECU, the position chip is connected to the engine ECU, and the upper housing 1 is connected to the engine ECU. The lower casing 2 is disassembled and installed, and the connection end of the upper casing 1 is provided with a plurality of slots 10, and the outer side of the connection end of the upper casing 1 is provided with elastic flanges 11, and the lower casing 1 The connecting end of the housing 2 is provided with a plug-in portion 12 matching the slot 10, and the connecting end of the lower housing 2 is fixedly connected to the elastic flange 11 through several fasteners. The slot 10 is provided with a hollow rubber protrusion 13, the top of the hollow rubber protrusion 13 forms a circular arc depression 14, and the end of the insertion part 12 has a circular arc matching the circular arc depression 14. The central angle of the protrusion 15 and the circular arc depression 14 is greater than 180°.

The motor drives the worm 4 to move through the reduction gear, and the worm 4 drives the fan-shaped turbine to move, and the turbine is coaxial with the output crankshaft 3 . The transmission device is mounted on the lower case 2 . A magnet 7 is installed at the other end of the output crankshaft 3 . The circuit board 8 is mounted on the upper case 1 . The circuit board 8 mainly includes a position detection chip and a corresponding supporting circuit. The position detection chip is concentric with the magnet 7 after installation. The device is driven by a motor to drive the output crankshaft 3, the output crankshaft 3 drives the external connecting rod, and the external connecting rod drives the nozzle ring or the wastegate valve to operate, thereby adjusting the flow characteristics of the turbocharger, and the position detection chip detects the flow rate according to the rotation of the magnet 7 The rotation position is output, and the position signal is converted into a PWM signal or an analog signal and sent to the engine ECU.

Compared with the pneumatic actuator, the present invention adopts the motor to drive the deceleration mechanism, so the response speed is greatly improved, and at the same time, the device feeds back the current position signal to the engine ECU, so that precise position control can be performed. Thereby, the hysteresis of the turbocharger under the low load condition of the engine can be reduced, and the dynamic performance of the vehicle can be improved. Since the electronic actuator is used, the bypass valve or nozzle ring of the supercharger can be continuously and accurately adjusted, so that the turbocharger can work in a high-efficiency range and reduce the emission of the whole machine. Since the electronic actuator is used, the entire supercharging control system can form a closed-loop control, so even if the system is aging, it can be compensated through the closed-loop control, so that the control accuracy will not be affected.

Due to the detachable connection between the upper housing 1 and the lower housing 2, it is convenient for maintenance and replacement of internal parts. In addition, due to the high air tightness requirements of the actuator, it is installed in the slot 10 of the upper housing 1. The hollow rubber protrusion 13 is provided with an insertion part 12 matched with the hollow rubber protrusion 13 on the lower shell 2, thereby forming an airtight structure, which not only makes the upper shell 1 and the lower shell 2 stably connected, but also airtight Good tightness, also has a good dust-proof effect, no need to set up a dust cover.

A preferred implementation manner in this embodiment is that a transmission mechanism is provided between the output crankshaft 3 of the drive motor 5 and the worm 4 , and the transmission mechanism is a gear transmission mechanism 9 .

In order to improve the airtightness of the actuator, a preferred implementation in this embodiment is that the output crankshaft 3 is rotatably connected to the lower housing 2 through an airtight bearing.

The preferred implementation mode in this embodiment is that the position chip is a Hall effect sensor chip, and its control is sensitive and responsive, and it can compensate for changes in temperature and air gap, and the requirements for the magnet 7 are reduced to a minimum, which can Programming and erasing, high precision, linear error within 0.2%, good high temperature resistance, and can work in a working environment of 160°C for a long time.

In order to facilitate processing, a preferred implementation manner in this embodiment is that the external interface is integrally formed with the upper casing 1 .

In order to facilitate installation and processing, a preferred implementation in this embodiment is that the sector gear 6 is fitted with the output crankshaft 3 through a key.

A method for installing an electronic actuator for a turbocharger, comprising the following steps:

(1) Installation of the output crankshaft; install the sector gear 6 on the output crankshaft 3 through key fit, fix the magnet 7 on one end of the output crankshaft 3 through a laser welding machine, and install the output crankshaft 3 on the lower casing through an airtight bearing within 2;

(2), drive mechanism installation, manually install the drive motor 5, and lock it by self-tapping screws, install the worm screw 4 on the lower housing 2 through the rotating bearing, and cooperate with the sector gear 6, on the output crankshaft of the drive motor 5 A gear transmission mechanism 9 is installed between 3 and the worm screw 4;

(3), the circuit board 8 is installed, and the circuit board 8 is fixed on the upper casing 1 by self-tapping screws according to the position of the magnet 7;

(4) Shell installation, cover the upper shell 1 and the lower shell 2 manually, the slot 10 on the upper shell 1 corresponds to the socket 12 on the lower shell 2, and put the upper shell 1 on the The elastic flange 11 and the lower shell 2 are fixed by several self-tapping screws;

(5), air tightness testing and performance testing;

(6), packaging, coding, storage.

The basic principles and main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments. What described in the above-mentioned embodiments and explanations is to illustrate the principles of the present invention. Under the premise of not departing from the spirit and scope of the present invention, the present invention also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed invention, and the claimed protection scope of the present invention is determined by the appended claims and its equivalents.

Claims (7)

1. turbocharger electronic actuators, including upper shell and the matched lower housing of the upper shell, the upper shell Sealing host cavity is formed between the lower housing, output crank shaft is rotatably connected on the lower housing, the output crank shaft Output terminal drives nozzle ring or exhaust gas bypass valve events by connecting rod, in the sealing host cavity rotation be provided with worm screw and The driving motor of the worm screw rotation is driven, the sector being meshed with the worm screw is fixedly installed on the output crank shaft Wheel, the other end of the output crank shaft is provided with circular magnet, is additionally provided with circuit board in the host cavity, on the circuit board Position detection chip is provided with, the position chip is arranged concentrically with the circular magnet, is additionally provided on the upper shell pair External tapping, the external interface include motor and drive positive end interface, motor driving negative terminal interface, power interface and ground interface, The motor drives positive end interface and motor driving negative terminal interface to be driven by Engine ECU by H bridges, and the power supply connects Mouth is connected with the signal power source that Engine ECU provides, and described ground interface is connected with the ground that Engine ECU provides, institute's rheme Chip is put with the Engine ECU to be connected, it is characterised in that：The upper shell mutually dismantles setting with the lower housing, described The connection end of upper shell offers several slots, and the outside of the connection end of the upper shell sets flexible flange, institute The connection end for stating lower housing is provided with and the matched plug division of the slot, connection end and the bullet of the lower housing Property flange be mutually fixedly connected by several fasteners, hollow rubber protrusion, hollow rubber protrusion are provided in the slot Top form arc depression, the end of the plug division has circular arc matched with arc depression protrusion, the circle The central angle of arc recess is more than 180 °.

2. turbocharger electronic actuators according to claim 1, it is characterised in that：The output of the driving motor Transmission mechanism is provided between bent axle and the worm screw, the transmission mechanism is gear drive.

3. turbocharger electronic actuators according to claim 1, it is characterised in that：The output crank shaft with it is described It is rotated connection by airtight bearing between lower housing.

4. turbocharger electronic actuators according to claim 1, it is characterised in that：The position chip is Hall Effect sensor chip.

5. turbocharger electronic actuators according to claim 1, it is characterised in that：The external interface with it is described Upper casing body by integral forming.

6. turbocharger electronic actuators according to claim 1, it is characterised in that：The sector gear with it is described Coordinated between output crank shaft by key.

7. a kind of installation method of turbocharger electronic actuators, it is characterised in that：Include the following steps：

(1), output crank shaft is installed；Sector gear is installed on by key cooperation on output crank shaft, by laser-beam welding machine by magnetic Output crank shaft is installed on by airtight bearing in lower housing by ferropexy in one end of output crank shaft；

(2), driving mechanism is installed, and installs driving motor manually, and lock by self-tapping screw, worm screw is pacified by rolling bearing Loaded on lower housing, and and gear segment mates, gear drive is installed between the output crank shaft of driving motor and worm screw；

(3), circuit board is installed, and is fixed on circuit board on upper shell by self-tapping screw according to magnet positions,；

(4), housing is installed, and manually closes upper shell and lower housing lid, the plug division pair on slot and lower housing on upper shell Should, it will be fixed between the elastic flange and lower housing on upper shell by several self-tapping screws；

(5), airtight detection and performance detection；

(6), packaging, stamp, storage.