Circuit for learning and calibrating position of automobile seat

Abstract

The utility model discloses a circuit for learning and calibrating the position of an automobile seat. The circuit comprises a Hall sensor, a Hall sampling circuit, a control unit and a Hall motor which are connected in sequence, the Hall sampling circuit comprises a comparator U7A, an inverted input pin of the comparator is connected with the sensor, and an output pin of the comparator is connected to the MCU of the control unit. The circuit provided by the utility model can automatically learn and calibrate the position of the seat, automatically record and position the position of the seat, and avoid the process of manual back-and-forth learning.

Description

Technical Field

[0001] The utility model relates to the field of seat calibration, and specifically to a circuit for learning and calibrating the position of an automotive seat. Background Technique

[0002] In the application of existing automotive electric seats, automotive electric seats need to have a one-key memory function, that is, when a set button is pressed, the seat automatically moves to the set position. There is a need for one-key memory positions for the front-back adjustment, cushion adjustment, backrest adjustment, leg rest adjustment, etc. of automotive seats; therefore, it is necessary to learn and calibrate their positions.

[0003] In the prior art, it is necessary to manually press buttons for calibration, resulting in low efficiency. Content of the Utility Model

[0004] The purpose of the utility model is to provide a circuit for learning and calibrating the position of an automotive seat to solve the problems raised in the above background technique.

[0005] To solve the above technical problems, the utility model provides the following technical solution: A circuit for learning and calibrating the position of an automotive seat, including a Hall sensor, a Hall sampling circuit, a control unit, and a Hall motor connected in sequence;

[0006] The Hall sampling circuit includes a comparator U7A. The inverting input pin of the comparator is connected to the sensor, and the output pin of the comparator is connected to the MCU of the control unit.

[0007] Preferably, the comparator U7A adopts the LM2903D model.

[0008] Preferably, a resistor R136 is connected to the inverting input terminal of the comparator U7A. One end of the resistor R136 is connected to the CON-Slide-sensor-in pin, and the CON-Slide-sensor-in pin is for the sensor to connect. It also includes a resistor R133 and a capacitor C97 connected in parallel between the resistor R136 and the CON-Slide-sensor-in pin. One end of the capacitor C97 is grounded, and one end of the resistor R133 is connected to the VBAT-12V-SW port.

[0009] Preferably, a resistor R137 and a resistor R138 are connected in parallel to the non-inverting input terminal of the comparator. One end of the resistor R137 is connected to the VBAT-12V-SW port, and one end of the resistor R138 is grounded.

[0010] Preferably, the output terminal of the comparator is connected to the Slide-sensor-to-MCU pin, as well as the capacitor C98 and the resistor R134 connected in parallel between the output terminal and the Slide-sensor-to-MCU pin. One end of the resistor R134 is connected to the 5V_SW / OP port, and one end of the capacitor C98 is grounded.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] The circuit provided by the present utility model can automatically learn and calibrate the seat position, automatically record and locate the seat position, and avoid the process of manual back-and-forth learning. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the sampling circuit principle of the present utility model;

[0014] Figure 2 is a schematic diagram of the sensor output pulse of the present utility model;

[0015] Figure 3 is a schematic diagram of the overall circuit module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0017] Referring to the figures shown, this embodiment provides a circuit for learning and calibrating the position of an automotive seat, including a Hall sensor, a Hall sampling circuit, a control unit, and a Hall motor connected in sequence; the Hall motor is the motor that drives the seat to move.

[0018] The Hall sampling circuit includes a comparator U7A. The inverting input pin of the comparator is connected to the sensor, and the output pin of the comparator is connected to the MCU of the control unit.

[0019] Comparator U7A adopts the LM2903D type. A resistor R136 is connected to the inverting input terminal of comparator U7A. One end of resistor R136 is connected to the CON-S l ide-sensor-i n pin, and the CON-S l ide-sensor-i n pin is for the sensor to connect. It also includes a resistor R133 and a capacitor C97 connected in parallel between resistor R136 and the CON-S l ide-sensor-i n pin. One end of capacitor C97 is grounded, and one end of resistor R133 is connected to the VBAT-12V-SW port. The non-inverting input terminals of the comparator are connected in parallel with a resistor R137 and a resistor R138. One end of resistor R137 is connected to the VBAT-12V-SW port, and one end of resistor R138 is grounded. The output terminal of the comparator is connected to the S l ide-sensor-to-MCU pin, and a capacitor C98 and a resistor R134 are connected in parallel between the output terminal and the S l ide-sensor-to-MCU pin. One end of resistor R134 is connected to the 5V_SW / OP port, and one end of capacitor C98 is grounded.

[0020] The control module controls the forward and reverse rotation of the Hall motor through the Hall motor drive module. When the Hall motor rotates one circle, the Hall sensor will output a pulse for one cycle, as Figure 1 shown; the Hall sampling circuit connected to the Hall motor, as Figure 2 shown, when sampling is required, connect a 12V power supply to VBAT-12V-SWG and a 5V power supply to 5V_SW / OP; one end of the Hall sensor is grounded, and the other end is connected to the CON-S l ide-sensor-i n pin. After being processed by the sampling and conversion circuit composed of LM2903, it reaches the control unit module through S l ide-sensor-to-MCU.

[0021] When calibration and learning of the position are required, after receiving the calibration and learning command, first, the control unit controls the Hall motor drive to drive the Hall motor in one direction A (such as the rearmost position of the front and rear adjustment) through the Hall motor drive module, and at the same time detects the width of the Hall pulse. When it is detected that the motor is blocked for more than 500 ms, the number of Hall pulses at this time is recorded as 0. Then, control the Hall motor to move in the other direction B (such as the forward movement of the front and rear adjustment). During the movement, for each revolution of the motor, the recorded number of Hall pulses is incremented by 1. When the Hall motor is driving in the other direction B (such as the foremost position of the front and rear adjustment) and the width of the Hall pulse is detected, when it is detected that the pulse width is greater than (i.e., the motor is blocked for more than) 500 ms, the number of Hall pulses at this time is recorded as the maximum pulse number S l ideStuyPu l se for learning. After that, the number of pulses decreases when the motor moves in the A direction and increases when it moves in the B direction.

[0022] The process of this movement is automatically completed by the control unit. The control unit automatically controls the Hall motor to move in the A direction. After stalling for 500 ms, it then automatically controls the Hall motor to move in the B direction. After stalling for 500 ms in the B direction, the motor is controlled to move to the set position C (such as the position with 50 pulses), and then the motor rotation stops.

[0023] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A circuit for learning and calibrating the position of an automotive seat, characterized in that: It includes a Hall sensor, a Hall sampling circuit, a control unit, and a Hall motor that are connected in sequence. The Hall sampling circuit includes a comparator U7A. The inverting input pin of the comparator is connected to the sensor, and the output pin of the comparator is connected to the MCU of the control unit. A resistor R136 is connected to the inverting input terminal of the comparator U7A. One end of the resistor R136 is connected to the CON-Slide-sensor-in pin for the sensor to connect. It also includes a resistor R133 and a capacitor C97 connected in parallel between the resistor R136 and the CON-Slide-sensor-in pin. One end of the capacitor C97 is grounded, and one end of the resistor R133 is connected to the VBAT-12V-SW port.

2. The circuit for automotive seat position learning and calibration according to claim 1, wherein: The comparator U7A uses the LM2903D model.

3. The circuit for automotive seat position learning and calibration according to claim 2, wherein: A resistor R137 and a resistor R138 are connected in parallel to the non-inverting input terminal of the comparator. One end of the resistor R137 is connected to the VBAT-12V-SW port, and one end of the resistor R138 is grounded.

4. A circuit for learning and calibrating the position of an automotive seat according to claim 3, characterized in that: The output terminal of the comparator is connected to the Slide-sensor-to-MCU pin, and a capacitor C98 and a resistor R134 are connected in parallel between the output terminal and the Slide-sensor-to-MCU pin. One end of the resistor R134 is connected to the 5V_SW / OP port, and one end of the capacitor C98 is grounded.

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