CN219221233U - Wire control gear shifting actuator and wire control gear shifting device based on switch Hall - Google Patents

Abstract

The utility model discloses a shift-by-wire actuator and a shift-by-wire device based on a switch Hall, which have high reliability and lower economic cost, wherein the shift-by-wire actuator comprises: the actuator comprises an actuator shell, a driving mechanism arranged in the actuator shell, a screw rod transmission mechanism connected with the driving mechanism and a push rod mechanism connected with the screw rod transmission mechanism; the drive mechanism comprises a drive-by-wire shift execution motor arranged in an actuator shell, the drive-by-wire shift execution motor comprises a position detection sensor and an inductive magnetic part, the drive-by-wire shift execution motor comprises a motor shell, a fixing part and an output part, the fixing part and the output part are arranged in an inner cavity of the motor shell, the position detection sensor is arranged on the inner side or the fixing part of the motor shell, the inductive magnetic part is arranged on the output part, the position detection sensor is used for detecting the position change of the output part of the drive-by-wire shift execution motor, and the displacement of the push rod driven by the screw rod transmission mechanism is obtained by processing the position information generated by the position detection sensor, so that the position of the push rod is obtained.

Description

Wire control gear shifting actuator and wire control gear shifting device based on switch Hall

Technical Field

The utility model relates to the technical field of automobile safety systems, in particular to the technical field of automobile automatic transmission gear shifting control, and particularly relates to a gear shifting by wire actuator and a gear shifting by wire device based on a switch Hall.

Background

With the rapid development of electric and intelligent automobiles, consumers pay more attention to vehicle configuration schemes with a sense of science and technology, safety and intelligence. Under the large background, a user realizes parking after engaging in the P gear, and an electronic P gear parking technology for engaging in the P gear to automatically unlock the P gear presents a rapidly expanding situation on new energy automobiles at home and abroad, so that the electronic P gear parking solution with high reliability and high cost performance for adapting to the new energy automobiles is more necessary for the user.

Currently, a shift control device for a shift-by-wire vehicle is used for automatic transmission shift control of a mass-produced vehicle type, and includes a shift mechanism, an actuator controller, and an actuator. The driver selects the parking gear (P gear), the neutral gear (N gear) or the driving gear (D gear, S gear, R gear and the like) of the vehicle by operating the gear shifting mechanism, and the actuator controller acquires the gear request and combines the whole vehicle information to control the actuator to drive the gear shifting shaft to realize the gear shifting of the automatic transmission.

As shown in fig. 1, the control device for a shift-by-wire vehicle includes a dc brush motor, a position detecting unit, an actuator housing, a speed reducer, a mating screw and screw nut, a slider, a push rod, a ball bowl connecting rod, and a shift rocker arm, wherein two ends of the screw are rotatably supported on the actuator housing, an input end of the speed reducer is connected with an output shaft of the motor, an output end of the speed reducer is connected with one end of the screw, the slider is fixed on the screw nut, one side surface of the slider is in sliding contact with an inner side surface of the actuator housing to limit relative rotation between the screw nut and the screw, one end of the push rod is connected to the slider, the other end of the push rod is connected with one end of the ball bowl connecting rod, the other end of the ball bowl connecting rod is connected with an outer end of the shift rocker arm of the automatic transmission of the vehicle, and a position detecting rocker arm is provided on the slider, and the upper portion of the position detecting rocker arm is connected with the side surface of the slider through a rotating shaft structure, so that linear motion of the slider can be converted into rotary motion of the rocker arm. The position detection unit of the control device for the shift-by-wire vehicle is composed of a double-path redundant linear Hall sensor 13 and a magnet 12 assembly attached to a position detection rocker arm 11. When the gear shifting operation is executed, the sliding block translates and synchronously drives the position detection rocker arm to rotate, and meanwhile, the magnet on the position detection rocker arm rotates, so that the voltage of the Hall plate changes, and the two paths of Hall sensors independently output, so that the rotation angle of the magnet can be read through internal linear fitting.

According to the control device of the shift-by-wire vehicle, the motor driving pins and the Hall position sensor connector pins are led out of the actuator shell through the wire harness and are combined to a new connector to be connected with an external circuit. This necessarily results in complicated circuitry within the actuator housing and is prone to wire mixing and poor contact. Under the prior art, the defects of the actuator adopting the position detection rocker arm and the angle Hall are mainly: the internal structural parts are more, and the circuit element circuit arrangement is complex, so that the risk of poor contact caused by jolt vibration under the driving working condition exists in the Hall position sensor connector, the reliability of the gear shifting device is greatly reduced, and the control comfort of a driver is influenced.

The patent with publication number CN107339415A discloses a shift-by-wire actuator and a shift device, wherein the shift-by-wire actuator comprises an actuator main body and a control module connected with the actuator main body; the actuator main body comprises a shell structure, a driving mechanism, a screw rod transmission mechanism, a position detection mechanism and an adjustable connecting rod, wherein the driving mechanism is arranged in the shell structure and connected with the control module, the screw rod transmission mechanism is connected with the driving mechanism, the position detection mechanism is connected with the screw rod transmission mechanism, and the adjustable connecting rod is connected with the screw rod transmission mechanism; the driving mechanism and the position detection mechanism are both connected with the control module, and the adjustable connecting rod protrudes out of the shell structure from the inside of the shell structure. The position detection sensor is arranged on a detection circuit board in the actuator main body to monitor the position of the position detection rocker arm in real time, the position detection circuit board judges the real-time positions of the adjustable connecting rod and the gear shifting rocker arm according to the position change information and transmits the real-time position information to the control module, and the control module can control the motor structure and can adjust the positions of a screw nut and a sliding sleeve of the screw rod transmission mechanism in real time so as to realize closed-loop control of the actuator. Because position detection mechanism is including setting up the position detection rocking arm on the sliding sleeve and setting up the magnet steel on the position detection rocking arm to and the position detection sensor of extra setting on detecting the circuit board, can cause the inside structure of shell structure more like this, and circuit element circuit arrangement is complicated, and the position detection sensor connector has the risk of leading to the contact failure because of jolt vibration under the operating mode of traveling.

Disclosure of Invention

The utility model aims to provide a shift-by-wire actuator with high reliability and low economic cost, so as to solve the problems that the internal structural parts and circuit components of the traditional shift-by-wire actuator are complex in arrangement and poor contact of connectors is easy to occur.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

a switch hall based shift-by-wire actuator comprising: the actuator comprises an actuator shell, a driving mechanism arranged in the actuator shell, a screw rod transmission mechanism connected with the driving mechanism and a push rod mechanism connected with the screw rod transmission mechanism; the driving mechanism is connected with the screw rod transmission mechanism, the push rod mechanism comprises a push rod protruding out of the actuator shell from the inside of the actuator shell, the push rod is connected with the screw rod transmission mechanism, the driving mechanism drives the screw rod transmission mechanism to move, and the screw rod transmission mechanism drives the push rod to move in the actuator shell; the driving mechanism comprises a shift-by-wire executing motor arranged in the actuator shell, the shift-by-wire executing motor comprises a position detecting sensor and an inductive magnetic part, the shift-by-wire executing motor comprises a motor shell, a fixing part and an output part, the fixing part and the output part are arranged in an inner cavity of the motor shell, the position detecting sensor is arranged on the inner side or the fixing part of the motor shell, the inductive magnetic part is arranged on the output part, the position detecting sensor is used for detecting the position change of the output part of the shift-by-wire executing motor, and the position information generated by the position detecting sensor is processed to obtain the displacement of the push rod driven by the screw rod transmission mechanism, so that the position of the push rod is obtained.

The position detection sensor is used for detecting the induction magnetic piece on the output part, when the output part rotates, the induction magnetic piece arranged on the output part is induced by the detection sensor when passing through the position detection sensor, and pulse signals are output by the position detection sensor so as to record the number of turns of the wire control gear shifting execution motor, and then the displacement of the push rod driven by the screw rod transmission mechanism is determined.

Preferably, the shift-by-wire executing motor further comprises a motor control circuit board arranged in the inner side of the motor shell, the position detecting sensor is arranged on the motor control circuit board or connected with the motor control circuit board through a wire harness, and the position detecting sensor is used for transmitting the output pulse signals to the motor control circuit board and analyzing and processing position information generated by the position detecting sensor through the motor control circuit board connected with the actuator controller.

Preferably, the screw transmission mechanism comprises a transmission screw rod connected with the driving mechanism, a screw rod nut matched with the transmission screw rod, and a sliding block fixed on the screw rod nut, wherein one side surface of the sliding block is in sliding contact with one inner side surface of the actuator shell to limit the relative rotation between the screw rod nut and the screw rod, and the position of the push rod is obtained by obtaining the displacement of the screw rod transmission mechanism for driving the push rod to move;

The shift-by-wire actuator further comprises a ball bowl connecting rod, one end of the push rod is fixedly connected to the sliding block, the other end of the push rod is in ball hinge connection with one end of the ball bowl connecting rod, and the other end of the ball bowl connecting rod is in ball hinge connection with the outer end of a shift rocker arm of the automatic transmission of the automobile;

the driving mechanism further comprises a speed reducer connected with the driving motor, the input end of the speed reducer is connected with the output shaft of the driving motor, and the output end of the speed reducer is connected with a transmission screw rod in the screw rod transmission mechanism.

Preferably, the position detection sensor is a switch hall sensor, the inductive magnetic element is magnetic steel, and the switch hall sensor and the magnetic steel are correspondingly arranged.

The drive-by-wire shift actuator adopts the integrated motor with the switch Hall sensor to replace the split structural design of the linear switch Hall sensor and the traditional direct current brush motor, so that components such as a position detection rocker arm, an induction magnet arranged on the position detection rocker arm, the linear switch Hall sensor and the like in the drive-by-wire shift actuator are canceled, the cost is saved to a certain extent, internal structural parts are reduced, the spatial arrangement in the actuator shell is optimized, and circuit element lines are simplified, so that the structure of the drive-by-wire shift actuator is more compact, and meanwhile, the risk that the contact failure is caused by jolt vibration outside the motor due to the arrangement of the connector of the prior Hall position sensor is reduced.

Preferably, the shift-by-wire executing motor is a direct current brush motor, the fixing part is a stator of the direct current brush motor, the output part comprises a stator of the direct current brush motor and an output shaft, the position detection sensor is arranged on a part of shaft body of the output shaft in an inner cavity of the motor shell, the induction magnetic part is correspondingly arranged with the position detection sensor, and the relative positions of the induction magnetic part, the motor shell and the stator are unchanged.

When the output shaft of the shift-by-wire executing motor rotates, the output shaft drives the transmission screw rod to rotate through the speed reducer, the transmission screw rod drives the screw rod nut and the sliding block to move along the transmission screw rod, and the sliding block drives the push rod to move in the actuator shell during movement, so that the position of the push rod is necessarily changed during rotation of the output shaft of the shift-by-wire executing motor, and the position information of the push rod can be analyzed and calculated by acquiring the position information of the output shaft; when the output shaft rotates, the inductive magnetic part arranged on the output shaft is caused to rotate to change a magnetic field, the switch Hall sensor arranged in the motor shell detects the change of the magnetic field and sends out pulse signals, so that the position change of the inductive magnetic part and the output shaft is identified (the motor control circuit board is integrated with a signal processing circuit which can convert the pulse signals into the position change), and the position change information is transmitted to the actuator controller through the signal processing circuit on the motor control circuit board, so that the positions of the screw nut, the sliding block and the connecting rod (or the gear shifting rocker arm) are detected in real time. And the motor adopts the direct current brush motor, and the direct current brush motor manufacturing process is mature, and advantage such as with low costs can be widely used in the executor control field of shifting.

Preferably, the switch hall sensor is internally provided with an amplifying circuit, and the amplifying circuit is used for amplifying and shaping alternating electric signals generated when the inductive magnetic element rotates to pass through the switch hall sensor and outputting matrix pulse signals.

When the inductive magnetic element in the shift-by-wire executing motor passes through the front end of the switch Hall sensor, the magnetic field is caused to change, the Hall element detects the magnetic field change and converts the magnetic field change into an alternating electric signal, the amplifying circuit is used for amplifying and shaping the signal, outputting a good matrix pulse signal, the measuring frequency range is wider, and the output signal is accurate and stable.

Preferably, two position detection sensors are arranged in the motor shell, and the two position detection sensors are arranged in an included angle, so that the running direction (forward rotation or reverse rotation) of the shift-by-wire executing motor can be judged through the phase difference of channel pulse signals generated by the two position detection sensors, and the position detection precision can be greatly improved.

Preferably, the push rod is connected with the screw rod transmission mechanism through a sliding block, the push rod extends out from the front side end of the actuator shell, an elastic limiting block is arranged close to the inner side of the front side end of the actuator shell and used for preventing the sliding block from excessively striking the inner wall of the actuator shell to generate abnormal sound, and the elastic limiting block is arranged to serve as the topmost limiting point of the sliding block movement.

Preferably, the elastic limiting block is made of rubber materials, and is designed to ensure that the impact on the sliding block, the motor and the actuator shell is reduced to the minimum through the rubber damping property when the sliding block moves at a higher speed to the top due to the protection of electronic elements and mechanical systems in the wire-control gear shifting actuator.

Preferably, the pulse signal output by the detection sensor is collected, the displacement of the sliding block is positioned by recording the pulse number, the positions of the push rod and the ball bowl connecting rod are detected, whether the position of the sliding block is in a P-gear locking or P-gear unlocking state is judged, the rotating speed of the motor can be detected by utilizing the pulse width, the position of the elastic limiting block is set to be a self-learning P-calibration position (particularly, the surface of the elastic limiting block facing the sliding block can be set to be the self-learning P-calibration position), the locking or unlocking function of the P-gear actuator is accurately realized, the pulse number value of the sliding block movement stroke is required to be calibrated, the sliding block movement stroke is the stroke between the sliding block moving to the topmost end and the sliding block moving to the bottommost end, the method comprises the steps that a position A of a sliding block moving to the topmost end is a position where an elastic limiting block faces one end face of the sliding block, a position C of the sliding block moving to the bottommost end is a limit position of a sliding block moving towards a direction deviating from the elastic limiting block, the position A of the sliding block moving to the topmost end is set to be a P-gear limit position, the position C of the sliding block moving to the bottommost end is set to be a non-P-gear limit position, the stroke between the non-P-gear limit position and the P-gear limit position is divided into a plurality of programming parts, and when a shift-by-wire executing motor drives the sliding block to move to the position A of the topmost end, the programming parts of the position are set to be a certain positive value to serve as a P-return self-learning calibration value.

By calibrating the pulse number value from the topmost end A (the P-gear limit position) to the bottommost end C (the non-P-gear limit position) of a certain stroke of the sliding block, the pulse number value is obtained with a very large error through theoretical calculation, so that the best control effect is required to be achieved through one-time debugging. Dividing the position A to the position C into a certain programming number of parts, and setting the programming number of parts at the position to be a certain positive value at the moment when the motor drives the sliding block to move to the topmost end (the end face of the elastic limiting block) to serve as a self-learning calibration value of P.

Preferably, a non-P gear target position and a P gear target position are set between the non-P gear limit position and the P gear limit position, the non-P gear target position is set at one side of the non-P gear limit position, a certain distance exists between the non-P gear limit position and the non-P gear target position, and the P gear target position is set at one side of the P gear limit position; the P gear target position is arranged between the P gear limiting positions with a certain distance, and the P gear target position is positioned between the non-P gear target position and the P gear limiting positions; and a locking section is arranged between the P-gear target position and the non-P-gear target position, and the starting point of the locking section is arranged close to the P-gear target position, so that the locking function of the sliding block can be realized in the locking section range only when the sliding block moves from the non-P-gear target position to the P-gear target position until the sliding block enters the locking section range, or the locking section is unlocked after the sliding block moves from the P-gear target position to the non-P-gear target position until the sliding block leaves the locking section range, and the locking function of the sliding block can be ensured to be realized in the locking section range only.

By the arrangement, the drive of the shift-by-wire executing motor can be stopped by a certain distance before the sliding block reaches the topmost end or the rearmost end, and then the shift-by-wire executing motor can reach the P gear target position or the non-P gear target position by utilizing inertia to continuously advance a bit, so that the sliding block can be prevented from continuously acting to strike structural members in the actuator shell to cause the motor to stop rotating. Therefore, a certain distance exists between the P gear target position and the non-P gear target position and the respective limit positions, and when the gear is switched from the P gear to the non-P gear, the gear-shifting-by-wire executing motor can be reversely controlled by a program, so that the sliding block reversely moves from the P gear target position by a fixed number n of pulses to enter the non-P gear target position; similarly, when the non-P gear is switched to the P gear, the motor can be controlled forward through a program, so that the sliding block moves forward from the non-P gear target position by a fixed number n of pulses, and the P gear locking can be completed within the range of the P gear locking interval. The above actuation procedure is repeated each time a P-range lock-out and unlock cycle.

Preferably, when the shift-by-wire executing motor operates for a plurality of times and is matched with the interaction of structural members in the actuator, the situation that the sliding block cannot reach the set P-gear target position or the non-P-gear target position effective range due to pulse loss, overlarge accumulated deviation and the like, so that the P-gear locking or unlocking function is invalid is often avoided. Therefore, after each ignition cycle or a certain number of gear shifting operations are performed in one ignition cycle, the calibration value of the switch Hall sensor is self-learned through software logic so as to be in contact with the front end limiting block, the P-gear entering limit position is calibrated at the moment, the feedback value of the switch Hall sensor is collected and set as the P-gear limit position, and the position of the connecting rod driven by the wire control gear shifting executing motor can be ensured to be relatively accurately fed back by the switch Hall.

Preferably, a plurality of inductive magnetic pieces are arranged on the circumference of an output shaft of the shift-by-wire executing motor so as to realize that the output shaft rotates for one circle, and a plurality of pulse outputs are obtained.

The second object of the utility model is to provide a shift-by-wire device, which comprises an actuator controller and the shift-by-wire actuator, wherein the shift-by-wire actuator is connected with the actuator controller, and the actuator controller is used for controlling the shift-by-wire actuator to drive an automatic transmission to shift after a gear request is acquired.

Preferably, the actuator controller is connected with a shift-by-wire executing motor in a driving mechanism of the shift-by-wire actuator, an external wire harness connector is arranged on the actuator shell, the shift-by-wire executing motor is connected to the external connector through a wire harness, the actuator controller arranged outside the actuator shell is connected with the external connector through the wire harness, and the electric signal receiving and transmitting of the shift-by-wire actuator are realized through a wire harness connector interface, so that the actuator controller can control the shift-by-wire actuator and analyze and process pulse signals sent by the position detection sensor. The actuator controller can control the rotation of the shift-by-wire actuating motor through the motor control circuit board; the position detection sensor is used for outputting pulse signals which are used for feeding back the rotation quantity of the output shaft of the wire-controlled gear shifting execution motor, so that the position detection sensor can detect the position change of the output shaft of the wire-controlled gear shifting execution motor, and the actuator controller analyzes and processes the pulse signals output by the position detection sensor after receiving the pulse signals output by the detection sensor so as to acquire the displacement quantity of the screw rod transmission mechanism for driving the push rod to move, and further obtain the position of the push rod.

The beneficial effects are that:

the motor adopted by the shift-by-wire actuator is a shift-by-wire actuator motor with a switch Hall sensor, the P-gear locking parking and unlocking functions can be realized, the switch Hall sensor arranged in the motor is adopted to replace the traditional linear switch Hall sensor, the switch Hall sensor is integrated into a direct current brush motor to replace the traditional position detection rocker arm to be matched with the linear switch Hall sensor to feed back the motor to drive the position mechanism, the problem that the position sensor fails due to poor contact of a multi-lead connector is solved, the reliability of the shifting device is improved, the structure is simple, the price is low, and the assembly is convenient.

Compared with a linear switch Hall sensor, the switch Hall sensor has the advantages of simple structure and certain cost, and the position detection precision of the switch Hall can be improved through a self-learning algorithm, so that the normal action of locking and unlocking the P-gear of the actuator is ensured. And the switch Hall sensor is integrated with the shift-by-wire executing motor, so that the internal arrangement space of the shell of the actuator is greatly saved, the socket and the position detection rocker arm of the electronic component of the external switch Hall sensor are eliminated, and the problem of product function failure caused by poor contact of the connector is effectively avoided.

Drawings

FIG. 1 is a schematic diagram of the components of a shift-by-wire actuator of a conventional vehicle type;

FIG. 2 is a schematic diagram of the components of a shift-by-wire actuator provided by the present utility model;

fig. 3 is a layout diagram of a dual-switch hall sensor chip provided in embodiment 2 of the present utility model in a motor;

FIG. 4 is a circuit diagram of a DC brushed motor of the shift-by-wire actuator of the present utility model;

fig. 5 is a switch hall circuit diagram of the shift-by-wire actuator provided in embodiment 2 of the present utility model;

fig. 6 is a schematic diagram of a pulse signal output by the dual-switch hall sensor according to embodiment 2 of the present utility model;

FIG. 7 is a schematic diagram corresponding to the conversion of the programmed number of times of the motion stroke of the sliding block.

Reference numerals

1. A shift-by-wire actuator; 11. a position detecting rocker arm; 12. a magnet; 13. a linear hall sensor;

20. an external harness connector; 21. an actuator housing; 22. a shift-by-wire execution motor; 23. a speed reducer; 24. a screw nut; 25. a transmission screw rod; 26. a slide block; 27. an elastic limiting block; 28. a push rod; 29. a ball bowl connecting rod;

31. magnetic steel; 32. a switch hall sensor;

Detailed Description

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following description will explain the specific embodiments of the present utility model with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the utility model, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.

The technical scheme of the utility model is described in detail in the following by specific embodiments.

Example 1

As shown in fig. 2, a shift-by-wire actuator 1 based on a switch hall, includes: an actuator housing 21, a driving mechanism provided in the actuator housing 21, a screw transmission mechanism connected to the driving mechanism, and a push rod 28 mechanism connected to the screw transmission mechanism; the driving mechanism is connected with the screw transmission mechanism, the push rod 28 mechanism comprises a push rod 28 protruding out of the actuator shell 21 from the inside of the actuator shell 21, the push rod 28 is connected with the screw transmission mechanism, the driving mechanism drives the screw transmission mechanism to move, and the screw transmission mechanism drives the push rod 28 to move in the actuator shell 21.

The driving mechanism comprises a shift-by-wire executing motor 22 arranged in an actuator shell 21, the shift-by-wire executing motor 22 comprises a motor shell, a fixing part and an output part, the fixing part and the output part are arranged in an inner cavity of the motor shell, the position detecting sensor is arranged on the inner side or the fixing part of the motor shell, the magnetic part is arranged on the output part, the position detecting sensor is used for detecting the position change of the output part of the shift-by-wire executing motor 22, and the position information generated by the position detecting sensor is processed to obtain the displacement amount of the push rod 28 driven by the screw rod transmission mechanism to move, so that the position of the push rod 28 is obtained. The position detecting sensor is used for detecting an induction magnetic part on the output part, when the output part rotates, the induction magnetic part arranged on the output part is induced by the detecting sensor when passing through the position detecting sensor, and pulse signals are output by the position detecting sensor so as to record the number of turns of the wire control gear shifting executing motor 22 and further determine the displacement of the screw rod transmission mechanism driving the push rod 28 to move.

The shift-by-wire executing motor 22 further comprises a motor control circuit board arranged in the inner side of the motor housing, the position detecting sensor is arranged on the motor control circuit board or connected with the motor control circuit board through a wire harness, and the position detecting sensor is used for transmitting the output pulse signals to the motor control circuit board and analyzing and processing the position information generated by the position detecting sensor through the motor control circuit board connected with the actuator controller.

The screw transmission mechanism comprises a transmission screw rod 25 connected with the driving mechanism, a screw nut 24 matched with the transmission screw rod 25, and a push rod 28 mechanism further comprises a sliding block 26 fixed on the screw nut 24, wherein one side surface of the sliding block 26 is in sliding contact with one inner side surface of the actuator shell 21 so as to limit relative rotation between the screw nut 24 and the screw rod, and the position of the push rod 28 is obtained by obtaining the displacement of the movement of the push rod 28 driven by the screw transmission mechanism.

The shift-by-wire actuator 1 further comprises a ball bowl connecting rod 29, one end of the push rod 28 is fixedly connected to the sliding block 26, the other end of the push rod is in ball hinge connection with one end of the ball bowl connecting rod 29, and the other end of the ball bowl connecting rod 29 is in ball hinge connection with the outer end of a shift rocker arm of the automatic transmission of the automobile.

The driving mechanism further comprises a speed reducer 23 connected with the driving motor, the input end of the speed reducer 23 is connected with the output shaft of the driving motor, and the output end of the speed reducer 23 is connected with a transmission screw 25 in the screw transmission mechanism.

A screw rod positioning mechanism is further arranged in the actuator shell 21, the screw rod positioning mechanism comprises a screw rod supporting seat arranged in the actuator shell 21 and a supporting bearing arranged on the screw rod supporting seat, and one end of the transmission screw rod 25 is arranged on the supporting bearing in a penetrating manner; a sliding rail is arranged on the inner side of the actuator housing 21, a sliding rail groove is formed in the sliding rail, and the screw nut 24 and the sliding block 26 are slidably arranged in the sliding rail groove.

The position detection sensor is a switch Hall sensor 32, the induction magnetic piece is a magnetic steel 31, and the switch Hall sensor 32 and the magnetic steel 31 are correspondingly arranged. By means of the arrangement, the shift-by-wire executing motor 22 and the switch Hall sensor 32 can be combined, the shift-by-wire executing device 1 adopts the integrated motor with the switch Hall sensor 32 to replace the split structural design of the linear Hall sensor 13 and the traditional direct current brush motor, and further components such as the position detecting rocker arm 11, the inductive magnetic piece arranged on the position detecting rocker arm 11, the linear Hall sensor 13 and the like in the shift-by-wire executing device 1 are omitted, cost is saved to a certain extent, internal structural parts are reduced, the space arrangement inside the executing device shell 21 is optimized, circuit element lines are simplified, the structure of the shift-by-wire executing device 1 is more compact, and meanwhile the risk that poor contact is caused by jolt vibration due to the fact that the traditional Hall position sensor connector is arranged outside the motor is reduced.

As shown in fig. 4, the shift-by-wire executing motor 22 is a dc brush motor, the fixing portion is a stator of the dc brush motor, the output portion includes a stator of the dc brush motor and an output shaft, the position detecting sensor is disposed on a portion of a shaft body of the output shaft located in an inner cavity of the motor housing, the inductive magnetic member is disposed corresponding to the position detecting sensor, and a relative position between the inductive magnetic member and the motor housing is unchanged.

When the output shaft of the shift-by-wire executing motor 22 rotates, the output shaft drives the transmission screw rod 25 to rotate through the speed reducer 23, the transmission screw rod 25 drives the screw nut 24 and the slide block 26 to move along the transmission screw rod 25, and the slide block 26 drives the push rod 28 to move in the actuator shell 21 during movement, so that the position of the push rod 28 is necessarily changed when the output shaft of the shift-by-wire executing motor 22 rotates, and the position information of the push rod 28 can be analyzed and calculated by acquiring the position information of the output shaft; when the output shaft rotates, the inductive magnetic element mounted on the output shaft rotates to change the magnetic field, the switch hall sensor 32 arranged in the motor housing detects the change of the magnetic field and sends out pulse signals, so that the position change of the inductive magnetic element and the output shaft is identified (the motor control circuit board is integrated with a signal processing circuit which can convert the pulse signals into the position change), therefore, when the switch hall sensor 32 is close to the inductive magnetic element, signal output exists, the pulse signal output is continuously generated along with the rotation of the motor, the position change information is transmitted to the actuator controller through the signal processing circuit on the motor control circuit board, and the positions of the screw nut 24, the sliding block 26 and the connecting rod (or the gear shifting rocker arm) are detected in real time. And the motor adopts the direct current brush motor, and the direct current brush motor manufacturing process is mature, and advantage such as with low costs can be widely used in the executor control field of shifting.

Further, an amplifying circuit is built in the switch hall sensor 32, and the amplifying circuit is used for amplifying and shaping an alternating electric signal generated when the inductive magnetic element rotates through the switch hall sensor 32, and outputting a matrix pulse signal. So set up, when the inductive magnetic element in the drive-by-wire shift execution motor 22 passes through the front end of the switch hall sensor 32, the magnetic field is caused to change, the switch hall sensor 32 detects the magnetic field change and converts the magnetic field change into an alternating electric signal, the amplifying circuit is used for carrying out I/O acquisition and amplifying and shaping on the signal, a good matrix pulse signal is output, the measuring frequency range is wider, and the output signal is accurate and stable.

The switch hall sensor 32 is used as a switch hall acquisition signal, and can judge whether the motor is blocked or not through the drive current of the shift-by-wire executing motor 22 and the width change of the pulse, when an obstacle exists, the current of the shift-by-wire executing motor 22 increases in a period, the frequency is reduced, the pulse is widened, and the motor needs to be decelerated and stopped when the set allowable range is reached.

The push rod 28 is connected with the screw rod transmission mechanism through the sliding block 26, the push rod 28 extends out of the front side end of the actuator shell 21, an elastic limiting block 27 is arranged close to the inner side of the front side end of the actuator shell 21, the elastic limiting block 27 is used for preventing the sliding block 26 from excessively striking the inner wall of the actuator shell to generate abnormal sound, and the elastic limiting block 27 is arranged to serve as the topmost limiting point of the movement of the sliding block 26. The elastic limiting block 27 is made of rubber materials, and the elastic limiting block 27 is designed to ensure that the impact on the sliding block 26, the motor and the actuator shell 21 due to the rubber damping property is reduced to the minimum when the sliding block 26 moves to the top at a high speed for protecting electronic components and mechanical systems in the wire-controlled gear shifting actuator 1.

By collecting the pulse signals output by the detection sensor, the displacement of the sliding block 26 is positioned by utilizing the number of recording pulses, so that the positions of the push rod 28 and the ball bowl connecting rod 29 can be detected, whether the position enters a P-gear locking or P-gear unlocking state or not is judged, the rotating speed of the motor can be detected by utilizing the pulse width, the position of the sliding block 26 is known, when the sliding block 26 moves to an expected target position in the actuator shell 21, the power supply can be automatically cut off to stop the motor, the sliding block 26 continues to slide for a certain distance by utilizing inertia, and finally the P-gear locking or unlocking is realized.

The position of the elastic limiting block 27 is set to be a self-learning back P calibration position (specifically, the surface of the elastic limiting block 27 facing the sliding block 26 can be set to be the self-learning back P calibration position), so as to accurately realize the locking or unlocking function of the P-gear actuator, the pulse number value of the sliding block 26 movement stroke needs to be calibrated, the sliding block 26 movement stroke is the stroke between the sliding block 26 movement to the topmost end and the movement to the bottommost end, the position A of the sliding block 26 movement to the topmost end is the position of the elastic limiting block 27 facing one end surface of the sliding block 26, the position C of the sliding block 26 movement to the bottommost end is the limit position of the sliding block 26 movement to the direction deviating from the elastic limiting block 27, the position C of the sliding block 26 movement to the bottommost end is set to be the non-P-gear limit position, the stroke between the non-P-gear limit position is divided into a plurality of programming parts, and when the wire control gear shifting execution motor 22 drives the sliding block 26 to the position A of the topmost end, the programming part is set to be the self-learning value.

By calibrating the pulse number value from the topmost end a (P-gear limit position) to the rearmost end C (non-P-gear limit position) of the slider 26, which is a certain stroke, the pulse number value is obtained with a very large error due to theoretical calculation, so that the best control effect is required to be achieved through one-time debugging.

Setting a non-P gear target position and a P gear target position between the non-P gear limit position and the P gear limit position, wherein the non-P gear target position is arranged on one side of the non-P gear limit position, a certain distance exists between the non-P gear target position and the non-P gear limit position, and the P gear target position is arranged on one side of the P gear limit position; the P gear target position is arranged between the P gear limiting positions with a certain distance, and the P gear target position is positioned between the non-P gear target position and the P gear limiting positions; and a locking section is arranged between the P-gear target position and the non-P-gear target position, wherein the starting point of the locking section is close to the P-gear target position, so that the locking of the slide block 26 is completed within the range of the locking section when the slide block 26 moves from the non-P-gear target position to the P-gear target position, or the unlocking of the slide block 26 is completed within the range of the locking section when the slide block 26 moves from the P-gear target position to the non-P-gear target position until the slide block leaves the range of the locking section, and the locking function can be ensured to be realized only in the range of the locking section.

The shift-by-wire actuator motor 22 stops driving a certain distance before the slide block 26 reaches the topmost or the rearmost end, and then continues to advance a little by inertia to reach the P-gear target position or the non-P-gear target position, so that the slide block 26 can be prevented from continuously acting to strike structural members in the actuator housing 21 to cause motor stalling. Therefore, the P range target position and the non-P range target position are set to have a certain distance from the respective limit positions, and when the shift from the P range to the non-P range is performed, the shift-by-wire execution motor 22 can be controlled in the reverse direction by the program, so that the slider 26 moves in the reverse direction from the P range target position by a fixed number n of pulses to enter the non-P range target position; similarly, when switching from non-P to P, the motor may be controlled in the forward direction by the program, so that the slider 26 moves forward a fixed number n of pulses from the non-P target position, and enters the range of the P blocking interval, and P blocking may be completed. The above actuation procedure is repeated each time a P-range lock-out and unlock cycle.

As shown in fig. 7, in this embodiment, the number of programming parts a to C is divided into 100 to 900, and when the motor-driven slider 26 moves to the end face a of the elastic stopper 27, the number of programming parts at the position is set to 100 as the P-return self-learning calibration value. The non-P-gear target position B and the P-gear target position E are respectively set with a certain distance from the non-P-gear limit position C and the P-gear limit position A, and particularly, through actual debugging, a locking interval range DA with a certain distance is arranged beside the P-gear target position, namely, the locking function can be realized in the DA range. Switching from the P gear to the non-P gear, the shift-by-wire executing motor 22 can be controlled in a program reverse direction, so that the sliding block 26 moves in a reverse direction for 500 pulses from the P gear target position E to enter the non-P gear target position B; likewise, shifting from non-P to P may be accomplished by programming the shift-by-wire actuator motor 22 to move the slide 26 forward 500 pulses from the non-P target position into the P lock range.

When the shift-by-wire executing motor 22 operates for a plurality of times and cooperates with the structural members in the actuator, the slide block 26 cannot reach the set P-gear target position or the P-gear target position effective range due to the loss of pulses, overlarge accumulated deviation and the like, which is unavoidable, and the P-gear locking or unlocking function is disabled. Therefore, after each ignition cycle or a certain number of gear shifting operations in one ignition cycle, the calibration value of the switch hall sensor 32 is self-learned through software logic so as to be in contact with the front end limiting block, at the moment, the P-gear entering limit position is calibrated, the feedback value of the switch hall sensor 32 is collected and set as the P-gear limit position, and the position of the connecting rod driven by the wire control gear shifting executing motor 22 is ensured to be accurately and reversely fed by the switch hall.

Example 2

The present embodiment only describes differences from the above embodiment, in this embodiment, as shown in fig. 3, two position detecting sensors are provided, specifically, two switch hall sensors 32 are adopted, and the two switch hall sensors 32 are disposed in the motor housing at an included angle, that is, two switch hall sensors 32 respectively form a certain included angle with a connecting line between the rotor centers of the shift-by-wire executing motor 22.

As shown in fig. 5 and 6, the switch hall sensor 32 outputs two high levels and two low levels upon sensing one rotation (360 °) of the output shaft, and determines the direction (forward rotation or reverse rotation) in which the shift-by-wire executing motor 22 operates by the phase difference of the channel pulse signals generated by the two position detecting sensors, which can greatly improve the accuracy of the position detection.

Further, the two switch hall sensors 32 respectively form an angle of 45 ° with the line connecting the centers of the rotors of the shift-by-wire executing motor 22.

Example 3

The present embodiment, in which a plurality of pieces of induction magnetic members are provided on the circumference of the output shaft of the shift-by-wire execution motor 22 to achieve one rotation of the output shaft, obtains a plurality of pulse outputs, will be described only differently from the above-described embodiments.

Example 4

The shift-by-wire device comprises an actuator controller and the shift-by-wire actuator 1 according to any one of the embodiments, wherein the shift-by-wire actuator 1 is connected with the actuator controller, and the actuator controller is used for controlling the shift-by-wire actuator 1 to drive an automatic transmission to shift after a gear request is acquired.

The actuator controller is connected with a wire-control gear-shifting executing motor 22 in a driving mechanism of the wire-control gear-shifting actuator 1, an external wire harness connector 20 is arranged on an actuator shell 21, the wire-control gear-shifting executing motor 22 is connected to the external connector through a wire harness, the actuator controller arranged outside the actuator shell 21 is connected with the external connector through the wire harness, and electric signal receiving and transmitting of the wire-control gear-shifting actuator are realized through a wire harness connector interface, so that the actuator controller can control the wire-control gear-shifting actuator 1 and analyze and process pulse signals sent by a position detection sensor. The actuator controller may control rotation of the shift-by-wire actuator motor 22 via the motor control circuit board; the position detection sensor is used for outputting pulse signals which are used for feeding back the rotation quantity of the output shaft of the gear-shifting control executing motor 22, so that the position detection sensor can detect the position change of the output shaft of the gear-shifting control executing motor 22, and the actuator controller analyzes and processes the pulse signals output by the position detection sensor after receiving the pulse signals output by the detection sensor so as to obtain the displacement quantity of the screw rod transmission mechanism driving the push rod 28 to move, and further obtain the position of the push rod 28.

The embodiments of the present utility model are described in detail above. The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the core concepts of the utility model. It should be noted that it will be apparent to those skilled in the art that the present utility model may be modified and adapted without departing from the principles of the present utility model, and that such modifications and adaptations are intended to be within the scope of the appended claims.

Claims (10)

1. A switch hall based shift-by-wire actuator comprising: an actuator housing (21), a driving mechanism provided in the actuator housing (21), a screw transmission mechanism connected to the driving mechanism, and a push rod (28) mechanism connected to the screw transmission mechanism; the driving mechanism is connected with the screw rod transmission mechanism, the push rod (28) mechanism comprises a push rod (28) protruding out of the actuator shell (21) from the inside of the actuator shell (21), the push rod (28) is connected with the screw rod transmission mechanism, the driving mechanism drives the screw rod transmission mechanism to move, and the screw rod transmission mechanism drives the push rod (28) to move in the actuator shell (21); the automatic transmission device is characterized in that the driving mechanism comprises a wire-control gear shifting executing motor (22) arranged in an actuator shell (21), the wire-control gear shifting executing motor (22) comprises a position detecting sensor and an inductive magnetic part, the wire-control gear shifting executing motor (22) comprises a motor shell, a fixing part and an output part, the fixing part and the output part are arranged in an inner cavity of the motor shell, the position detecting sensor is arranged on the inner side or the fixing part of the motor shell, the inductive magnetic part is arranged on the output part, the position detecting sensor is used for detecting the position change of the output part of the wire-control gear shifting executing motor (22), and the position information generated by the position detecting sensor is processed to obtain the displacement of the push rod (28) driven by the screw rod transmission mechanism, so as to obtain the position of the push rod (28).

2. The shift-by-wire actuator according to claim 1, wherein the position detection sensor is a switch hall sensor (32), the inductive magnetic member is a magnetic steel (31), and the switch hall sensor (32) and the magnetic steel (31) are disposed correspondingly.

3. The shift-by-wire actuator according to claim 1, wherein the shift-by-wire actuator motor (22) is a direct current brushed motor, the fixing portion is a stator of the direct current brushed motor, the output portion includes a stator of the direct current brushed motor and an output shaft, the position detection sensor is disposed on a portion of a shaft body of the output shaft located in an inner cavity of the motor housing, the inductive magnetic member is disposed corresponding to the position detection sensor, and a relative position of the inductive magnetic member and the motor housing and the stator is unchanged.

4. The shift-by-wire actuator according to claim 2, wherein the switch hall sensor (32) has an amplification circuit built therein for amplifying and shaping an alternating electric signal generated when the inductive magnetic member rotates through the switch hall sensor (32) and outputting a matrix pulse signal.

5. The shift-by-wire actuator (1) according to any one of claims 1-4, characterized in that two of the position detection sensors are provided, the two position detection sensors are arranged in the motor housing at an angle, and the direction in which the shift-by-wire actuator motor (22) operates is determined by the phase difference of the channel pulse signals generated by the two position detection sensors.

6. Shift-by-wire actuator according to claim 1, characterized in that the push rod (28) is connected with the screw drive via a slide (26), the push rod (28) extends out from the front end of the actuator housing (21), an elastic limit block (27) is arranged close to the inside of the front end of the actuator housing (21), and the elastic limit block (27) is arranged as the topmost limit point of the movement of the slide (26).

7. The shift-by-wire actuator according to claim 6, wherein the position of the elastic stopper (27) is set to be a self-learning P calibration position, the number of pulses is recorded to position the displacement amount of the slider (26) by collecting the pulse signal output from the detection sensor, the number of pulses of the movement stroke of the slider (26) is calibrated, the movement stroke of the slider (26) is a stroke between the movement of the slider (26) to the topmost end and the movement to the bottommost end, the position a of the slider (26) to the topmost end is a position where the elastic stopper (27) is located toward an end face of the slider (26), the position C of the slider (26) to the bottommost end is a limit position of the movement stroke of the slider (26) toward the direction away from the elastic stopper (27), the position a of the slider (26) to the topmost end is set to be a P limit position, the position C of the slider (26) to the bottommost end is set to be a non-P limit position, the programmed stroke between the non-P limit position and the non-P limit position is set to the P limit position, and the number of the shift stroke is programmed to be a number of times when the position a is programmed to be a correction value, and the number of shift-by-wire actuator is set to be a calibration value when the number of the position is programmed.

8. The shift-by-wire actuator of claim 7, wherein a non-P range target position and a P range target position are provided between the non-P range limit position and the P range limit position, the non-P range target position being provided on one side of the non-P range limit position, the non-P range target position being provided with a certain distance between the non-P range limit positions, the P range target position being provided on one side of the P range limit position; the P gear target position is arranged between the P gear limiting positions with a certain distance, and the P gear target position is positioned between the non-P gear target position and the P gear limiting positions; and a locking section is arranged between the P-gear target position and the non-P-gear target position, and the starting point of the locking section is arranged close to the P-gear target position, so that the slide block (26) finishes P-gear locking when moving from the non-P-gear target position to the P-gear target position until entering the locking section range, or finishes P-gear unlocking when moving from the P-gear target position to the non-P-gear target position until leaving the locking section range.

9. A shift-by-wire actuator according to claim 1 or 3, characterized in that a plurality of inductive magnetic elements are arranged on the circumference of the output shaft of the shift-by-wire actuator motor (22) to achieve a plurality of pulse outputs with one rotation of the output shaft.

10. A shift-by-wire device, characterized by comprising an actuator controller and a shift-by-wire actuator (1) according to any one of claims 1-9, wherein the shift-by-wire actuator (1) is connected with the actuator controller, and the actuator controller is used for controlling the shift-by-wire actuator (1) to drive an automatic transmission to shift after a gear request is acquired.

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