CN210554676U - Speed regulation control system of windscreen wiper - Google Patents
Speed regulation control system of windscreen wiper Download PDFInfo
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- CN210554676U CN210554676U CN201921110920.3U CN201921110920U CN210554676U CN 210554676 U CN210554676 U CN 210554676U CN 201921110920 U CN201921110920 U CN 201921110920U CN 210554676 U CN210554676 U CN 210554676U
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Abstract
A speed regulation control system of a wiper comprises a motor, a connecting rod structure, a system module and an induction module, wherein the connecting rod structure converts the unidirectional motion of the motor into the reciprocating motion of the wiper on a glass surface, and the induction module is used for inducing a discrete signal or a continuous signal according to a circle of the unidirectional motion of the motor; the control module is respectively in electric signal connection with the motor and the induction module, and provides a target driving effective voltage of the control motor corresponding to the signal for the motor according to the signal fed back by the induction module, so that the motor is driven by the target driving effective voltage corresponding to each group of signals in the unidirectional motion of the motor, and the motion speed of the wiper is further adjusted. The driving effective voltage of the motor is controlled, the windscreen wiper is controlled to move in a variable speed manner, so that the speed of the windscreen wiper is reduced near a reversal point, the windscreen wiper is controlled to operate at an accelerated speed in a certain manner in a middle area, the wiping speed is improved, the operation speed of the windscreen wiper in the whole wiping period is guaranteed to be adjustable, the elastic deformation of a wiper blade during high-speed wiping is reduced, and the reversal noise of the windscreen wiper is reduced.
Description
Technical Field
The utility model relates to a windscreen wiper speed governing technical field, concretely relates to speed governing control system of windscreen wiper.
Background
The wiper is also called a wiper, a wiper blade or a windshield wiper, and is a device for wiping and removing raindrops and dust attached to a windshield of a vehicle, so as to improve the visibility of a driver and increase the driving safety.
Control the windscreen wiper respectively through high-speed shelves and low-speed shelves and carry out high-speed water scraping and low-speed water scraping, wherein, the windscreen wiper passes through the connecting rod structure drive by the motor, and general drive mode has two kinds:
one driving mode is that the motor runs in a uniform speed and in a single direction, and then the single-direction motion of a circle is converted into the reciprocating motion of the wiper on the glass surface through a connecting rod structure; in this driving method, it is generally difficult to adjust the reversing speed of the wiper at the position of the reversing point of the wiper, and the following problems are caused:
1) when the automobile windscreen wiper is designed, a larger distance from the A column needs to be reserved, and because the wiper blade of the windscreen wiper has certain elasticity, the wiper blade is closer to the A column when the windscreen wiper wipes water at a high speed, the larger distance from the A column needs to be reserved, so that the wiping area and the subjective feeling of a driver are influenced;
2) the wiper generates a loud noise at the position of the reversal point, and for example, the blade reverses too fast to bring a loud reversal noise.
The other driving mode is to control the motor to switch forward and reverse rotation and convert the forward and reverse rotation of the motor into the reciprocating motion of the wiper on the glass surface through a connecting rod structure. The moving speed and the reverse noise of the wiper in the reverse point area are controlled by adjusting the forward and reverse rotating speed of the motor in real time and adjusting the operating speed of the wiper on the glass surface. However, the motor is required to be controlled to rotate forwards and backwards, so that the driving mode needs a motor with higher cost, and the cost of the whole system is higher.
Disclosure of Invention
The application provides a dispatch control system of windscreen wiper can solve the problem that is difficult to adjust the reversal speed of windscreen wiper when motor unidirectional motion drive windscreen wiper.
In order to solve the above problems, the technical solution of the present application is as follows:
the application provides a speed regulation control system of windscreen wiper, including motor and link structure, one end and the motor output of link structure are connected, and the other end is connected with the windscreen wiper, the link structure turns into the reciprocating motion of windscreen wiper on the glass surface with the unidirectional movement of motor, still include control module group and response module group;
the induction module is matched with the motor and used for inducing a discrete signal or a continuous signal according to one-way movement of the motor;
the control module respectively with motor and induction module signal connection, the control module according to the signal that the induction module feedbacked to the motor provides with the target drive effective voltage of the control motor that the signal corresponds, so that in the unidirectional movement of motor, through the target drive effective voltage drive motor that each signal corresponds, and then adjust the velocity of motion of windscreen wiper.
In one embodiment, the sensing module comprises a magnetic position sensor and a magnetic device;
the magnetic device is arranged on an output shaft of the motor and synchronously rotates along with the output shaft of the motor;
the magnetic position sensor is positioned above the magnetic device, and when the magnetic device rotates for one circle along with the motor, the magnetic position sensor induces discrete signals or continuous signals through the magnetic field intensity of the magnetic device.
In one embodiment, the magnetic position sensor is a single hall sensor, and the magnetic device is a magnetic sheet or a magnetic ring;
the magnetic sheet or the magnetic ring is arranged on a worm wheel of the motor, and the magnetic sheet or the magnetic ring and the output shaft of the motor rotate synchronously;
the single Hall sensor is positioned above the edge profile of the shooting area of the magnetic sheet or the magnetic ring, and when the magnetic sheet or the magnetic ring rotates for one circle along with the motor, the single Hall sensor induces two groups of signals through the magnetic field intensity of the magnetic sheet or the magnetic ring.
In one embodiment, the magnetic position sensor is a double hall sensor, and the magnetic device is a magnetic sheet or a magnetic ring;
the magnetic sheet or the magnetic ring is arranged on a worm wheel of the motor, and the magnetic sheet or the magnetic ring and the output shaft of the motor rotate synchronously;
the double-Hall sensor is positioned above the edge profile of the shooting area of the magnetic sheet or the magnetic ring, and when the magnetic sheet or the magnetic ring rotates for one circle along with the motor, the double-Hall sensor induces four groups of signals through the magnetic field intensity of the magnetic sheet or the magnetic ring.
In one embodiment, the magnetic position sensor is a combination of a double hall sensor and a single hall sensor, and the magnetic device is a magnetic sheet or a magnetic ring;
the magnetic sheet or the magnetic ring is arranged on a worm wheel of the motor and rotates in a same-interference manner with the output shaft of the motor;
the magnetic position sensor is positioned above the edge profile of the shooting area of the magnetic sheet or the magnetic ring, and when the magnetic sheet or the magnetic ring rotates for one circle along with the motor, the magnetic position sensor induces eight groups of signals through the magnetic field intensity of the magnetic sheet or the magnetic ring.
In one embodiment, the magnetic position sensor is a linear hall sensor, and the magnetic device is a magnetic sheet or a magnetic ring;
the magnetic sheet or the magnetic ring is arranged on a worm wheel of the motor and rotates in a same-interference manner with the output shaft of the motor;
the linear Hall sensor is positioned right above the projection area of the magnetic sheet or the magnetic ring, the center of the sensing area of the linear Hall sensor is coaxial with the center of the projection area, and when the magnetic sheet or the magnetic ring rotates along with the motor for one circle, the linear Hall sensor senses a continuous signal through the magnetic field intensity of the magnetic sheet or the magnetic ring.
In one embodiment, the distance between adjacent hall sensors is a preset distance.
In one embodiment, the control module comprises: the device comprises a main control unit and a power driving circuit;
the output end of the main control unit is electrically connected with the power driving circuit, the power driving circuit is used for driving the motor to rotate in a single direction, and the main control unit is in signal connection with the induction module;
in the process that the power driving circuit controls the motor to rotate in a single direction, the control module provides a target driving effective voltage of the control motor corresponding to the signal to the power driving circuit according to the signal fed back by the induction module, so that the motor is driven by the target driving effective voltage corresponding to each group of signals in the single-direction movement of the motor, and the movement speed of the wiper is adjusted.
In one embodiment, the power driving circuit comprises any combination of:
the device comprises a PMOS and an NMOS, wherein the high side of a motor is used for driving, a reserved sampling resistor is arranged at the lower end of the motor, when the motor works normally, a low side MOS and a high side MOS are mutually opened in an opposite phase, when the motor stops, the high side MOS is closed, and the low side MOS is opened to provide braking force for the motor;
the device comprises a PMOS and an NMOS, wherein the low side of a motor is used for driving, a reserved sampling resistor is arranged at the lower end of a low side MOS, when the motor works normally, the high side MOS and the low side MOS are mutually opened in opposite phases, when the motor stops, the low side MOS is closed, and the high side MOS is opened to provide braking force for the motor;
the NMOS and the NMOS are combined, wherein the high side of the motor is adopted for driving, a reserved sampling resistor is arranged at the lower end of the motor, when the motor works normally, the low side MOS and the high side MOS are mutually opened in opposite phases, when the motor stops, the high side MOS is closed, and the low side MOS is opened to provide braking force for the motor;
NMOS and NMOS combination, wherein, adopt the drive of motor low side, reserve the sampling resistor and set up in low side MOS lower extreme, when the motor normally worked, high side MOS and low side MOS opened for the opposition each other, closed low side MOS when the motor stopped to open high side MOS, provide the brake force for the motor.
In one embodiment, the main control unit comprises a main control MCU and a drive circuit;
the master control MCU is coupled with the input end of the driving circuit, the output end of the driving circuit is coupled with the input end of the power driving circuit, the master control MCU is further in signal connection with the induction module, the master control MCU provides the driving circuit with the duty ratio of target driving effective voltage corresponding to the signal, and the driving circuit drives the power driving circuit based on the duty ratio.
In one embodiment, the main control unit further includes an amplifier, an input end of the amplifier is coupled to the power driving circuit, and an output end of the amplifier is coupled to the main control MCU, so that the main control MCU, the driving circuit, the power driving circuit and the amplifier form a closed-loop control, and the main control MCU controls a duty ratio output to the driving circuit according to a sampling electrical signal of the power driving circuit fed back by the amplifier.
In one embodiment, the main control unit further includes a power module, and the power module is configured to supply power to the main control MCU and supply power to the sensing module.
In one embodiment, at least one of the components of the main control unit is a discrete structure.
In one embodiment, the main control unit is an integrated circuit chip, and each component of the main control unit is integrated on the integrated circuit chip.
In one embodiment, the control module further comprises an anti-reverse connection circuit, and an output end of the anti-reverse connection circuit is coupled to the power module and used for preventing the master control unit from being reversely connected.
In one embodiment, the control module further includes a filter circuit, one end of the filter circuit is coupled to the power module, the other end of the filter circuit is coupled to the power driving circuit, and the filter circuit is configured to supply power to the power driving circuit and further configured to suppress a PWM driving waveform of the power driving circuit from being emitted to the outside.
In one embodiment, the control module further comprises a temperature sensor coupled to the main control MCU.
According to the speed regulation control system of the embodiment, the driving effective voltage of the motor is controlled in the process that the motor drives the wiper to reciprocate in a single direction, the speed change motion of the wiper is controlled, for example, the wiper can slow down near a reversal point, the wiper is controlled to run at an accelerated speed in a certain mode in the middle area of the reversal point, the wiping speed is improved, the running speed of the wiper in the whole wiping period is guaranteed to be adjustable, the elastic deformation of the wiper blade during high-speed wiping is reduced, and the reversal noise of the wiper is reduced at the same time.
Drawings
FIG. 1 is a schematic block diagram of a speed control system;
FIG. 2 is a corresponding circuit schematic of FIG. 1;
FIG. 3 is a diagram illustrating an embodiment of FIG. 1;
FIG. 4 is a schematic diagram of division of an angle interval based on a single Hall signal;
FIG. 5 is a graph of angular velocity based on a single Hall signal;
FIG. 6 is a schematic diagram of division of an angle interval based on dual Hall signals;
FIG. 7 is a graphical illustration of angular velocity curves based on dual Hall signals;
fig. 8 is a schematic view of a structure of a speed regulation control system matched with a motor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The present invention provides an exemplary existing application scenario, a wiper used in an automobile is driven by a motor in combination with a connecting rod structure, wherein one driving manner is that a unidirectional motion of the motor is converted into a reciprocating motion of the wiper on a glass surface through the connecting rod structure, but an external power supply voltage of the motor is fixed (i.e. an actual voltage provided to the motor is fixed), so that a rotating speed of the motor is fixed, the motor can only run in a uniform speed and in a unidirectional manner, and the scheduling of the wiper cannot be realized.
Based on foretell application scenario in the embodiment of the utility model provides an in, provide a speed governing control system of windscreen wiper, the design of this method is: the unidirectional motion of the motor is converted into the reciprocating motion of the wiper, and the target driving effective voltage of the motor is controlled in the unidirectional motion of the motor, so that the motor adjusts the motion speed of the wiper based on the target driving effective voltage.
Through the design thought, in the process of motor one-way drive windscreen wiper reciprocating motion, the drive effective voltage of control motor, and then control windscreen wiper variable motion, for example, make the windscreen wiper can slow down near reversal point, control the acceleration operation of windscreen wiper according to certain mode in the middle zone of reversal point, improve and scrape water speed, thereby guarantee that the windscreen wiper operates speed adjustable in whole water period of scraping, the elastic deformation of doctor-bar when reducing high-speed water of scraping reduces windscreen wiper reversal noise simultaneously.
In order to realize the design idea, the speed regulation control system of the embodiment comprises a motor, a connecting rod structure, a control module and an induction module, and the schematic diagram of the system is shown in fig. 1, fig. 2 and fig. 3.
The connection relation among the motor, the connecting rod structure and the wiper and the principle that the connecting rod structure converts the unidirectional motion of the motor into the reciprocating motion of the wiper on the glass surface are the prior art, and the embodiment is not repeated in detail, and the improvement point of the embodiment is that on the premise that the original motor and connecting rod structure are not changed, the induction module is installed in a matched manner with the motor by adding the control module and the induction module, and the induction module is used for inducing a discrete signal or a continuous signal according to one circle of unidirectional motion of the motor; the control module is respectively in electric signal connection with the motor and the induction module, and provides a target driving effective voltage of the control motor corresponding to the signal to the motor according to the signal fed back by the induction module, so that the motor is driven by the target driving effective voltage corresponding to each group of signals in one-way motion of the motor, and further the motion speed of the wiper is adjusted.
The principle of basic implementation is as follows: in order to make the in-process control motor variable speed motion of motor unidirectional movement, this application increases the response module, through the signal of response module response motor unidirectional movement a week, then, the control module provides the target drive effective voltage of the control motor that corresponds with current signal to the motor according to the current signal of response module feedback.
Specifically, in practical application, according to the specific structural design of the induction module, when the motor moves in a single direction for one circle (0-360 °), the induction module can induce to obtain a discrete signal or a continuous signal, in this example, the induction module comprises a magnetic position sensor and a magnetic device, the magnetic device is installed on the output shaft of the motor, and the magnetic device synchronously rotates along with the output shaft of the motor; the magnetic position sensor is positioned above the magnetic device, when the magnetic device rotates for one circle along with the motor, the magnetic position sensor induces a discrete signal or a continuous signal through the magnetic field intensity of the magnetic device, and in practical application, the discrete signal or the continuous signal can be sent to the control module through a digital signal, an analog signal or an SPI signal; it is therefore understood that without specific reference, the signal sensed by the magnetic position sensor of this example refers to the position signal of the motor rotation, wherein the magnetic position sensor may be a magnetic position/angle sensor such as AMR, TMR, GMR, etc. The sensing module is described in detail below by taking an example of discrete signals sensed by the sensing module.
In one embodiment, the magnetic position sensor is a single hall sensor, and the magnetic device is a magnetic sheet or a magnetic ring, wherein the magnetic sheet or the magnetic ring is arranged on a worm wheel of the motor and rotates synchronously with the output shaft of the motor; the single Hall sensor is positioned above the edge profile of the shooting area of the magnetic sheet or the magnetic ring, and when the magnetic sheet or the magnetic ring rotates for one circle along with the motor, the single Hall sensor induces two groups of signals through the magnetic field intensity of the magnetic sheet or the magnetic ring.
Specifically, a magnetic sheet or a magnetic ring with an N pole and an S pole is arranged in the center of a worm wheel of the motor, the magnetic sheet or the magnetic ring and an output shaft of the motor rotate synchronously, the single Hall sensor and the magnetic sheet or the magnetic ring are arranged in a deviation mode, and when the magnetic sheet or the magnetic ring rotates along with the motor, the single Hall sensor generates a path of induction signal through the magnetic field intensity of the magnetic sheet or the magnetic ring, so that after the motor rotates in a single direction for a circle, the single Hall sensor induces two groups of signals.
In order to provide different target driving effective voltages for the motor according to two groups of different position signals, the angle interval (0, 2 pi) of one rotation of the motor is divided into two angle intervals according to the two groups of signals sensed by the single hall sensor, namely a first angle interval and a second angle interval.
As shown in fig. 4, the angular interval during one rotation of the motor includes an angular interval AB and an angular interval BA, where the angular interval AB ranges from (0, pi) to (pi, 2 pi).
In this case, the control module is preset with target driving effective voltages corresponding to the two sets of signals, and when the control module obtains a signal fed back by the single hall sensor, the control module provides the motor with the target driving effective voltage corresponding to the signal, so that in the unidirectional motion of the motor, the motor is driven by the target driving effective voltage corresponding to each set of signals, and further the motion speed of the wiper is adjusted, wherein the angular speed of the motor moving in each rotation angle interval is as shown in fig. 5.
In another embodiment, the magnetic position sensor is a double-Hall sensor, and the magnetic device is a magnetic sheet or a magnetic ring; wherein, the magnetic sheet or the magnetic ring is arranged on a worm wheel of the motor and synchronously rotates with the output shaft of the motor; the double Hall sensors are positioned above the edge profile of the shooting area of the magnetic sheet or the magnetic ring, and when the magnetic sheet or the magnetic ring rotates for one circle along with the motor, the double Hall sensors sense four groups of signals.
Specifically, a magnetic sheet or a magnetic ring with an N pole and an S pole is arranged in the center of a worm wheel of the motor, the magnetic sheet or the magnetic ring and an output shaft of the motor rotate synchronously, and the double Hall sensors and the magnetic sheet or the magnetic ring are arranged in a deviation mode.
In order to provide different target driving effective voltages for the motor according to four different sets of position signals, the present example divides an angle interval (0, 2 pi) of one rotation of the motor into four angle intervals according to the four sets of signals sensed by the dual hall sensors, which are a first angle interval, a second angle interval, a third angle interval and a fourth angle interval respectively.
As shown in FIG. 6, the first angle section AB is (0, 2/3 π), the second angle section BC is (2/3 π, π), the third angle section CD is (π, 5/3 π), and the fourth angle section DA is (5/3 π, 2 π).
In this case, the control module is preset with target driving effective voltages corresponding to the four groups of signals, and when the control module obtains a signal fed back by the dual hall sensors, the control module provides the motor with the target driving effective voltage corresponding to the signal, so that in the unidirectional motion of the motor, the motor is driven by the target driving effective voltage corresponding to each group of signals, and further the motion speed of the wiper is adjusted, wherein the angular speed of the motor moving in each rotation angle section is as shown in fig. 7.
In another embodiment, the magnetic position sensor is a combination of a double-Hall sensor and a single-Hall sensor, and the magnetic device is a magnetic sheet or a magnetic ring; the magnetic sheet or the magnetic ring is arranged on a worm wheel of the motor and rotates in a coordinated manner with the output shaft of the motor; the magnetic position sensor is positioned above the edge profile of the shooting area of the magnetic sheet or the magnetic ring, and when the magnetic sheet or the magnetic ring rotates for one circle along with the motor, the magnetic position sensor induces eight groups of signals through the magnetic field intensity of the magnetic sheet or the magnetic ring.
Similarly, in order to provide different target driving effective voltages for the motor according to eight different sets of position signals, the angle interval (0, 2 pi) of one rotation of the motor is divided into eight angle intervals according to eight sets of signals sensed by the double hall sensors; and the control module is preset with target driving effective voltages corresponding to the eight groups of signals, and when the control module acquires the signals fed back by the double Hall sensors, the control module provides the target driving effective voltages corresponding to the signals to the motor, so that in the unidirectional motion of the motor, the motor is driven by the target driving effective voltages corresponding to the groups of signals, and the motion speed of the wiper is adjusted.
It should be noted that, when the magnetic position sensor is a dual hall sensor, or the dual hall sensor and the single hall sensor form a triple hall sensor, two hall sensors or three hall sensors are required to be arranged above the edge profile of the shot-shadow region of the magnetic sheet or the magnetic ring, but the distance between adjacent hall sensors needs to be arranged according to a preset distance, taking two hall sensors a and B as an example, the calculation formula of the preset distance is:
wherein, B0Field strength at level reversal of Hall sensor, BATo measure the peak field strength at point A, BBFor measuring the peak field strength, # at point BsetIs a target included angle; l isAThe field intensity distance L from the Hall sensor A to the magnetic sheet or the magnetic ringBThe distance between the Hall sensor B and the magnetic sheet or the magnetic ring is the field intensity distance, and the distance d is the preset distance between the Hall sensor A and the Hall sensor B.
The following description will describe the sensing module in detail by taking an example of the sensing module being able to sense and obtain a continuous signal.
In one embodiment, the magnetic position sensor is a linear hall sensor, and the magnetic device is a magnetic sheet or a magnetic ring; the magnetic sheet or the magnetic ring is arranged on a worm wheel of the motor and rotates in a coordinated manner with the output shaft of the motor; the linear Hall sensor is positioned right above the projection area of the magnetic sheet or the magnetic ring, the center of the sensing area of the linear Hall sensor is coaxial with the center of the projection area, and when the magnetic sheet or the magnetic ring rotates along with the motor for one circle, the linear Hall sensor senses a continuous signal through the magnetic field intensity of the magnetic sheet or the magnetic ring.
Specifically, a magnetic sheet or a magnetic ring with an N pole and an S pole is arranged in the center of a worm wheel of the motor, the magnetic sheet or the magnetic ring and an output shaft of the motor rotate synchronously, an induction area of the linear Hall sensor and the center of a projection area of the magnetic sheet or the magnetic ring are coaxially arranged, and when the magnetic sheet or the magnetic ring rotates along with the motor, the linear Hall sensor generates continuous induction signals through the magnetic field intensity of the magnetic sheet or the magnetic ring, so that after the motor rotates in a single direction for one circle, the linear Hall sensor induces the continuous signals.
Under the condition, the control module is preset with target driving effective voltages corresponding to the continuous signals, and when the control module acquires signals fed back by the linear Hall sensor, the control module provides the target driving effective voltages corresponding to the signals to the motor, so that in the unidirectional motion of the motor, the motor is driven by the target driving effective voltages corresponding to the signals, and the motion speed of the wiper is adjusted.
Whether the induction module induces discrete signals or continuous signals, the signals are intrinsically reflected by the position signals of the rotation of the motor, for example, if the induction module induces two groups of signals, the angle interval of one circle of the motor movement can be divided into two rotation angle intervals, and each group of signals is used for reflecting the position signals of each rotation angle interval; similarly, if the sensing module senses four sets of signals, the angular interval of one rotation of the motor can be divided into four angular intervals, and each set of signals is used for reflecting the position signal of each angular interval. The control module provides the target driving effective voltage of the control motor corresponding to the signal to the motor according to the signal fed back by the induction module, namely, the control module can provide the corresponding target driving effective voltage in the rotation angle interval to which the motor belongs, so that the motor moves in a single direction for a circle and has different target driving effective voltages corresponding to different rotation angle intervals, furthermore, the motor drives the effective voltage to control the movement speed of the wiper in different rotation angle intervals according to different targets, thereby achieving the effect of adjusting the speed of the wiper, such as reducing the speed of the wiper near the reversal point, the windscreen wiper is controlled to run in a certain mode in the middle area of the reversal point to increase the water wiping speed, so that the running speed of the windscreen wiper is guaranteed to be adjustable in the whole water wiping period, the elastic deformation of a wiper blade during high-speed water wiping is reduced, and the reversal noise of the windscreen wiper is reduced.
In addition, the magnetic position sensor and the control module in the above embodiments are mounted on the PCB together, and the sensing module described in the above embodiments cannot exhaust the design structure of the sensing module, so that a person skilled in the art can perform deformation processing on the sensing module on the basis of the above embodiments to enable the sensing module to sense a discrete signal or a continuous signal for one rotation of the motor, which is within the protection scope of the present application.
The following describes the structure of the control module.
The control module comprises a main control unit and a power driving circuit, wherein the output end of the main control unit is electrically connected with the power driving circuit, the power driving circuit is used for driving the motor to rotate in a single direction, and the main control unit is in signal connection with the induction module; in the process that the power driving circuit controls the motor to rotate in one direction, the control module provides a target driving effective voltage of the control motor corresponding to the signal to the power driving circuit according to the signal fed back by the induction module, so that in the one-way movement of the motor, the motor is driven by the target driving effective voltage corresponding to each group of signals, and further the movement speed of the wiper is adjusted.
Wherein, the power driving circuit is combined by the following four types:
1) the PMOS and the NMOS are combined, the high side of the motor is driven, a sampling resistor is reserved at the lower end of the motor, when the motor works normally, the low side MOS and the high side MOS are opened in opposite phase, when the motor stops, the high side MOS is immediately closed, the low side MOS is opened, and braking force is provided for the motor; in this combination method, whether the low-side MOS and the high-side MOS are PMOS or NMOS is not particularly limited, and any combination of PMOS and NMOS may be used.
2) The PMOS and the NMOS are combined, the motor is driven at the low side, a sampling resistor is reserved at the lower end of the low side MOS, when the motor works normally, the high side MOS and the low side MOS are mutually opened in opposite phases, when the motor stops, the low side MOS is immediately closed, and the high side MOS is opened to provide braking force for the motor; in this combination method, whether the low-side MOS and the high-side MOS are PMOS or NMOS is not particularly limited, and any combination of PMOS and NMOS may be used.
3) The NMOS and the NMOS are combined, the high side of the motor is driven, the sampling resistor is reserved at the lower end of the motor, when the motor works normally, the low side MOS and the high side MOS are opened in opposite phase, the high side MOS is closed immediately when the motor stops, the low side MOS is opened, and braking force is provided for the motor.
4) NMOS and NMOS combination, motor low side drive, reserve the sampling resistor at low limit MOS lower extreme, when the motor normally worked, high limit MOS opened with low limit MOS each other is the looks opposition, closed low limit MOS at once when the motor stopped to open high limit MOS, provide the brake force for the motor.
In the combination mode, one MOS is used as a main drive, and the other MOS is connected with the motor in parallel, has a freewheeling function and provides braking when the motor stops.
In addition to the above combination, in other embodiments, the power driving circuit may also adopt a combination of a relay and a diode.
In one embodiment, the main control unit comprises a main control MCU and a driving circuit, wherein the main control MCU is coupled with the input end of the driving circuit, the output end of the driving circuit is coupled with the input end of the power driving circuit, the main control MCU is further in signal connection with the induction module, the main control MCU provides the duty ratio of target driving effective voltage corresponding to the signal to the driving circuit, and the driving circuit drives the power driving circuit based on the duty ratio; specifically, the main control MCU searches for a pre-stored target driving effective voltage matched with the current signal according to the current signal fed back by the sensing module, calculates a duty ratio according to the target driving effective voltage and the actual power supply voltage, and finally transmits the duty ratio to the driving circuit, and the driving circuit amplifies and converts the duty ratio into a voltage of the power driving circuit, so that the power driving circuit drives the motor to rotate unidirectionally according to the duty ratio.
In another embodiment, the main control unit further comprises an amplifier, an input end of the amplifier is coupled to the power driving circuit, and an output end of the amplifier is coupled to the main control MCU, so that the main control MCU, the driving circuit, the power driving circuit and the amplifier form closed-loop control, and the main control MCU controls a duty ratio output to the driving circuit according to a sampling electrical signal of the power driving circuit fed back by the amplifier; specifically, the input end of the amplifier is coupled to a sampling resistor in the power driving circuit so as to feed back a voltage signal or a current signal of the sampling resistor to the main control MCU, and the main control MCU self-adjusts the duty ratio output to the driving circuit according to the voltage signal or the current signal fed back by the amplifier so as to achieve the effect of accurately controlling the rotating speed of the motor.
Furthermore, the main control unit also comprises a power supply module which is used for supplying power to the main control MCU. It should be noted that at least one of the components of the main control unit is a discrete structure, for example, the main control MCU, the driving circuit, the amplifier and the power module are independent modules; or the main control unit is an integrated PCB board, and all components of the main control unit are integrated on the integrated PCB board, for example, the main control MCU, the driving circuit, the amplifier and the power module are integrated and arranged on the integrated PCB board.
Further, the control module of the embodiment further comprises an anti-reverse connection circuit, wherein the output end of the anti-reverse connection circuit is coupled with the power supply module and used for preventing the main control unit from reverse connection; therefore, the control module further comprises a charge pump, the input end of the charge pump is coupled to the main control MCU, the output end of the charge pump is coupled to the reverse connection prevention circuit, and the charge pump provides voltage to the reverse connection prevention circuit according to a control command of the main control MCU so that the reverse connection prevention circuit works.
The reverse connection preventing circuit of this example has the following four structures:
1) an independent reverse-connection prevention diode;
2) the P-type MOSFET on the positive electrode of the power supply is used for preventing reverse connection, the S electrode of the PMOS is connected with an external power supply, the G electrode is grounded through a resistor, the two ends of the GS are divided by the resistor, and a clamping diode ZD and a capacitor are added to prevent the MOS from being broken down due to overlarge voltage;
3) the negative electrode of a power supply is used for preventing reverse connection of an N-type MOSFET, the D electrode of an NMOS is connected with the external ground, the G electrode of the NMOS is connected with the power supply through a resistor, the two ends of GS are divided by resistors, a clamping diode ZD and a capacitor are added, and the MOS is prevented from being broken down due to overlarge voltage;
4) the N-type MOSFET on the positive electrode of the power supply is used for preventing reverse connection, the S electrode of the NMOS is connected with an external power supply, the G electrode is connected with the output of a charge pump of the MCU through a resistor, the two ends of the GS adopt resistor voltage division, a clamping diode ZD and a capacitor are added, and the MOS is prevented from being broken down due to overlarge voltage.
The reverse withstand voltage of the MOS or the diode in the anti-reverse connection circuit needs to be more than 40V.
Furthermore, the control module also comprises a filter circuit, one end of the filter circuit is coupled with the power supply module, the other end of the filter circuit is coupled with the power driving circuit, and the filter circuit is used for supplying power to the power driving circuit and inhibiting the PWM driving waveform of the power driving circuit from being emitted outwards; specifically, the filter circuit is an LC filter circuit, the LC filter circuit inhibits PWM driving waveforms in the power driving circuit from emitting to the outside, the capacitor needs an aluminum electrolytic capacitor above 680UF, the left side of pi may not be aluminum electrolytic, but needs MLCCs above 1UF and several MLCCs of 100nF, 1nF, 10pF, etc.
Furthermore, the control module of the embodiment also comprises a temperature sensor, the temperature sensor is used for sensing the temperature of the PCB and the temperature of a worm wheel of the motor, the temperature sensor is coupled with the main control MCU, and the sensed temperature is fed back to the main control MCU in real time; the temperature sensor may be a positive temperature coefficient thermistor (PTC) or a negative temperature coefficient thermistor (NTC).
The structure diagrams of the control module, the induction module and the motor in the embodiment are matched as shown in fig. 8, after the control module 1 and the induction module 2 are installed on the motor 3, the control module 1 provides the target driving effective voltage of the control motor 3 corresponding to the signal to the motor 3 according to the signal fed back by the induction module 2, so that in the unidirectional motion of the motor 3, the motor 3 is driven by the target driving effective voltage corresponding to each group of signals, and the unidirectional variable-speed motion of the motor 3 is converted into the reciprocating variable-speed motion of the wiper on the glass surface by the connecting rod structure, thereby adjusting the motion speed of the wiper.
It is right to have used specific individual example above the utility model discloses expound, only be used for helping to understand the utility model discloses, not be used for the restriction the utility model discloses. To the technical field of the utility model technical personnel, the foundation the utility model discloses an idea can also be made a plurality of simple deductions, warp or replacement.
Claims (17)
1. A speed regulation control system of a wiper comprises a motor and a connecting rod structure, wherein one end of the connecting rod structure is connected with the output end of the motor, the other end of the connecting rod structure is connected with the wiper, the connecting rod structure converts the unidirectional motion of the motor into the reciprocating motion of the wiper on a glass surface, and the speed regulation control system is characterized by further comprising a control module and an induction module;
the induction module is matched with the motor and used for inducing a discrete signal or a continuous signal according to one-way movement of the motor;
the control module respectively with motor and induction module signal connection, the control module according to the signal that the induction module feedbacked to the motor provides with the target drive effective voltage of the control motor that the signal corresponds, so that in the unidirectional movement of motor, through the target drive effective voltage drive motor that each signal corresponds, and then adjust the velocity of motion of windscreen wiper.
2. Speed governing control system according to claim 1, wherein said sensing module comprises a magnetic position sensor and a magnetic device, wherein said magnetic position sensor is of the type AMR, TMR, GMR or continuous hall;
the magnetic device is arranged on an output shaft of the motor and synchronously rotates along with the output shaft of the motor;
the magnetic position sensor is positioned above the magnetic device, and when the magnetic device rotates for one circle along with the motor, the magnetic position sensor induces discrete signals or continuous signals through the magnetic field intensity of the magnetic device.
3. A speed control system according to claim 2, wherein the magnetic position sensor is a single hall sensor and the magnetic means is a magnetic sheet or ring;
the magnetic sheet or the magnetic ring is arranged on a worm wheel of the motor, and the magnetic sheet or the magnetic ring and the output shaft of the motor rotate synchronously;
the single Hall sensor is positioned above the edge profile of the shooting area of the magnetic sheet or the magnetic ring, and when the magnetic sheet or the magnetic ring rotates for one circle along with the motor, the single Hall sensor induces two groups of signals through the magnetic field intensity of the magnetic sheet or the magnetic ring.
4. A speed control system according to claim 2, wherein the magnetic position sensor is a double hall sensor and the magnetic means is a magnetic sheet or a magnetic ring;
the magnetic sheet or the magnetic ring is arranged on a worm wheel of the motor, and the magnetic sheet or the magnetic ring and the output shaft of the motor rotate synchronously;
the double-Hall sensor is positioned above the edge profile of the shooting area of the magnetic sheet or the magnetic ring, and when the magnetic sheet or the magnetic ring rotates for one circle along with the motor, the double-Hall sensor induces four groups of signals through the magnetic field intensity of the magnetic sheet or the magnetic ring.
5. A speed governing control system as claimed in claim 2, wherein said magnetic position sensor is a combination of a double hall sensor and a single hall sensor, and said magnetic means is a magnetic sheet or a magnetic ring;
the magnetic sheet or the magnetic ring is arranged on a worm wheel of the motor and rotates in a same-interference manner with the output shaft of the motor;
the magnetic position sensor is positioned above the edge profile of the shooting area of the magnetic sheet or the magnetic ring, and when the magnetic sheet or the magnetic ring rotates for one circle along with the motor, the magnetic position sensor induces eight groups of signals through the magnetic field intensity of the magnetic sheet or the magnetic ring.
6. A speed control system according to claim 2, wherein the magnetic position sensor is a linear hall sensor and the magnetic means is a magnetic sheet or ring;
the magnetic sheet or the magnetic ring is arranged on a worm wheel of the motor and rotates in a same-interference manner with the output shaft of the motor;
the linear Hall sensor is positioned right above the projection area of the magnetic sheet or the magnetic ring, the center of the sensing area of the linear Hall sensor is coaxial with the center of the projection area, and when the magnetic sheet or the magnetic ring rotates along with the motor for one circle, the linear Hall sensor senses a continuous signal through the magnetic field intensity of the magnetic sheet or the magnetic ring.
7. The throttle control system according to any one of claims 4 to 5, wherein the distance between adjacent Hall sensors is a predetermined distance.
8. The throttle control system of claim 1, wherein the control module comprises: the device comprises a main control unit and a power driving circuit;
the output end of the main control unit is electrically connected with the power driving circuit, the power driving circuit is used for driving the motor to rotate in a single direction, and the main control unit is in signal connection with the induction module;
in the process that the power driving circuit controls the motor to rotate in a single direction, the main control unit provides a target driving effective voltage of the control motor corresponding to the signal to the power driving circuit according to the signal fed back by the induction module, so that the motor is driven by the target driving effective voltage corresponding to each group of signals in the single-direction movement of the motor, and the movement speed of the wiper is further adjusted.
9. The throttle control system of claim 8, wherein the power drive circuit comprises any combination of:
the device comprises a PMOS and an NMOS, wherein the high side of a motor is used for driving, a reserved sampling resistor is arranged at the lower end of the motor, when the motor works normally, a low side MOS and a high side MOS are mutually opened in an opposite phase, when the motor stops, the high side MOS is closed, and the low side MOS is opened to provide braking force for the motor;
the device comprises a PMOS and an NMOS, wherein the low side of a motor is used for driving, a reserved sampling resistor is arranged at the lower end of a low side MOS, when the motor works normally, the high side MOS and the low side MOS are mutually opened in opposite phases, when the motor stops, the low side MOS is closed, and the high side MOS is opened to provide braking force for the motor;
the NMOS and the NMOS are combined, wherein the high side of the motor is adopted for driving, a reserved sampling resistor is arranged at the lower end of the motor, when the motor works normally, the low side MOS and the high side MOS are mutually opened in opposite phases, when the motor stops, the high side MOS is closed, and the low side MOS is opened to provide braking force for the motor;
NMOS and NMOS combination, wherein, adopt the drive of motor low side, reserve the sampling resistor and set up in low side MOS lower extreme, when the motor normally worked, high side MOS and low side MOS opened for the opposition each other, closed low side MOS when the motor stopped to open high side MOS, provide the brake force for the motor.
10. The speed governing control system of claim 8, wherein the master control unit comprises a master MCU and a drive circuit;
the master control MCU is coupled with the input end of the driving circuit, the output end of the driving circuit is coupled with the input end of the power driving circuit, the master control MCU is further in signal connection with the induction module, the master control MCU provides the driving circuit with the duty ratio of target driving effective voltage corresponding to the signal, and the driving circuit drives the power driving circuit based on the duty ratio.
11. The throttle control system of claim 10, wherein the master control unit further comprises an amplifier, an input of the amplifier is coupled to the power drive circuit, and an output of the amplifier is coupled to the master MCU, such that the master MCU, the drive circuit, the power drive circuit, and the amplifier form a closed-loop control, the master MCU controlling the duty cycle output to the drive circuit according to the sampled electrical signal of the power drive circuit fed back by the amplifier.
12. The speed governing control system of claim 11, wherein the master control unit further comprises a power module for powering the master MCU and the induction module.
13. A throttle control system as claimed in any one of claims 8 to 12 wherein at least one of the components of the master control unit is of discrete construction.
14. A throttle control system as set forth in any of claims 8-12 wherein the master control unit is an integrated circuit chip on which the components of the master control unit are integrated.
15. The speed governing control system of claim 12, wherein the control module further comprises an anti-reverse connection circuit, an output of the anti-reverse connection circuit being coupled to the power module for preventing reverse connection of the master control unit.
16. The system according to claim 12, wherein the control module further comprises a filter circuit, one end of the filter circuit is coupled to the power module, the other end of the filter circuit is coupled to the power driving circuit, and the filter circuit is configured to supply power to the power driving circuit and further configured to suppress the PWM driving waveform of the power driving circuit from being emitted to the outside.
17. The speed governing control system of claim 10, wherein the control module further comprises a temperature sensor coupled to the master MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2020/089214 WO2020224645A1 (en) | 2019-05-08 | 2020-05-08 | Speed regulation control system for windshield wiper |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920651641 | 2019-05-08 | ||
| CN2019206516411 | 2019-05-08 |
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| CN210554676U true CN210554676U (en) | 2020-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921110920.3U Active CN210554676U (en) | 2019-05-08 | 2019-07-16 | Speed regulation control system of windscreen wiper |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110228448A (en) * | 2019-05-08 | 2019-09-13 | 上海禹点电子科技有限公司 | A kind of speed-adjusting and control system of windscreen wiper |
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2019
- 2019-07-16 CN CN201921110920.3U patent/CN210554676U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110228448A (en) * | 2019-05-08 | 2019-09-13 | 上海禹点电子科技有限公司 | A kind of speed-adjusting and control system of windscreen wiper |
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