Motor control system of automobile seat

Abstract

The utility model discloses a motor control system of an automobile seat. The motor control system comprises a control module, a relay driving module, a speed regulation driving module and a motor driving module, the relay driving module comprises a plurality of relays; the positive electrodes of the motors of the multiple automobile seats are all connected with the same relay, and the negative electrodes of the motors of the automobile seats are connected with the relays in a one-to-one mode. According to the motor control system of the automobile seat, one relay is used for controlling the positive electrodes of the motors of all the automobile seats, other relays independently control the negative electrodes of the motors of the automobile seats, a parallel relay driving circuit of the motors of the automobile seats is achieved, and then the motors of the automobile seats can be connected in series and in parallel through special series-parallel connection of the relays. The use number of relays is effectively reduced, and the cost of the motor driving circuit of the automobile seat is reduced; and meanwhile, the speed regulation of the motor can be realized while the positive and negative rotation of the motor is ensured, and the problem that the traditional relay control circuit cannot regulate the speed is solved.

Description

Technical Field

[0001] This utility model belongs to the field of motor control for automobile seats, and specifically relates to a motor control system for automobile seats. Background Technology

[0002] Currently, the mainstream control method for car seat motors is relay control. Relay control has the advantages of low cost and simple control. However, most existing relay control is distributed control, that is, each end of the motor is controlled by a single-pole double-throw relay. This means that two relays are needed to complete the forward and reverse control of the motor. Therefore, this distributed control uses a large number of relays. In addition, the control scheme that only uses relays cannot adjust the speed of the motor. Utility Model Content

[0003] The purpose of this invention is to provide a motor control system for automotive seats, which is designed with a parallel relay drive circuit for automotive seat motors. This design effectively reduces the number of relays used and lowers the cost of the automotive seat motor drive circuit through the special series-parallel connection of relays.

[0004] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:

[0005] A motor control system for an automotive seat includes a control module, a relay drive module, a speed control drive module, and a motor drive module.

[0006] The control module has its first output terminal connected to the input terminal of the relay drive module, and its second output terminal connected to the first input terminal of the speed control drive module.

[0007] The output terminal of the relay driving module is connected to the first input terminal of the motor driving module.

[0008] The speed control drive module has its first output terminal connected to the second input terminal of the motor drive module;

[0009] The motor drive module drives the motor of the car seat to rotate forward or in reverse.

[0010] The relay drive module includes multiple relays; the positive terminals of the motors of multiple car seats are all connected to the same relay, and the negative terminals of the motors of each car seat are connected one-to-one with a relay.

[0011] This utility model discloses a motor control system for car seats, which uses one relay to control the positive terminal of all car seat motors, while other relays independently control the negative terminal of the car seat motors. This realizes a parallel relay drive circuit for the car seat motors, and through the special series and parallel connection of relays, the number of relays used can be effectively reduced, thereby reducing the cost of the car seat motor drive circuit.

[0012] Preferably, the control module sends a first control signal to the relay drive module; the relay drive module controls the motor drive module to output a high-level signal or a low-level signal to drive the motor of the car seat according to the first control signal.

[0013] Preferably, the motor drive module outputs a high-level signal to drive the motor of the car seat to rotate forward, or outputs a low-level signal to drive the motor of the car seat to rotate in reverse.

[0014] Preferably, the control module sends a second control signal to the speed control drive module; the speed control drive module controls the motor drive module to output a speed control signal to the motor of the car seat according to the second control signal.

[0015] Preferably, the control module includes a controller; the motor drive module includes multiple relay drive MOSFETs; the gates of all relay drive MOSFETs are connected to the controller, the sources of all relay drive MOSFETs are grounded, and the drain of each relay drive MOSFET is connected one-to-one to one end of the coil of a relay.

[0016] Preferably, the motor control system further includes an input voltage; the other end of the coil of all relays is connected to the input voltage; and the normally open contacts of all relays are connected to the input voltage.

[0017] Preferably, if the number of motors in the car seat is n, then the number of relays is n+1; the common contact of one relay is connected to the positive terminal of all the motors in the car seat, and the common contacts of the remaining n relays are connected one-to-one to the negative terminal of a motor in the car seat; where n≥1, n∈Z.

[0018] Preferably, the speed control drive module includes a speed control drive MOSFET; all normally closed contacts of the relays are connected to the drain of the speed control drive MOSFET; and the gate of the speed control drive MOSFET is connected to the controller.

[0019] Preferably, the motor control system further includes a current acquisition module; the output terminal of the current acquisition module is connected to the input terminal of the control module; the second output terminal of the speed control drive module is connected to the input terminal of the current acquisition module; the output terminal of the motor drive module is connected to the second input terminal of the speed control drive module; the current acquisition module acquires the current information of the motor and sends it to the control module.

[0020] Preferably, the current acquisition module includes a sampling resistor and an operational amplifier; the source of the speed-regulating drive MOS transistor is connected to one end of the sampling resistor; the other end of the sampling resistor is grounded; the input terminal of the operational amplifier is connected to both ends of the sampling resistor; and the output terminal of the operational amplifier is connected to the controller.

[0021] The motor control system for a car seat of this utility model has the following beneficial effects:

[0022] 1. By using one relay to control the positive terminal of all car seat motors, and other relays to independently control the negative terminal of the car seat motors, a parallel relay drive circuit for the car seat motors is realized. In this way, the number of relays used can be effectively reduced through the special series and parallel connection of relays, thereby reducing the cost of the car seat motor drive circuit.

[0023] 2. The relay drives the MOSFET to drive the motor to rotate forward or backward. The speed control MOSFET chops the ground terminal of the motor, ensuring that the motor can rotate forward and backward while adjusting the speed. This solves the problem that traditional relay drive circuits cannot adjust the speed. Attached Figure Description

[0024] Figure 1 The diagram shown is a structural block diagram of a motor control system for a car seat according to an embodiment.

[0025] Figure 2 The diagram shown is a schematic of a parallel relay drive circuit for a motor control system of an automobile seat according to an embodiment.

[0026] Figure 3 The diagram shown is a schematic of the current flow direction when the motor control system of a car seat is performing forward speed regulation according to an embodiment.

[0027] Figure 4 The diagram shows the current flow direction when the motor control system of a car seat reverses to adjust the speed, according to an embodiment.

[0028] Figure Labels

[0029] 1. Control module; 2. Relay drive module; 3. Motor drive module; 4. Motor for car seat; 5. Speed ​​control drive module; 6. Current acquisition module. Detailed Implementation

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0031] The technical solution of this utility model will be described in detail below with specific embodiments.

[0032] Example 1

[0033] like Figure 1 As shown, a motor control system for an automotive seat in this embodiment includes a control module 1, a relay drive module 2, a speed control drive module 5, and a motor drive module 3.

[0034] The control module 1 has its first output terminal connected to the input terminal of the relay drive module 2, and its second output terminal connected to the first input terminal of the speed control drive module 5.

[0035] The relay drive module 2 has its output terminal connected to the first input terminal of the motor drive module 3;

[0036] The speed control drive module 5 has its first output terminal connected to the second input terminal of the motor drive module 3;

[0037] Motor drive module 3 drives motor 4 of the car seat to rotate forward or in reverse.

[0038] The relay drive module 2 includes multiple relays; the positive terminals of the motors 4 of multiple car seats are all connected to the same relay, and the negative terminals of the motors 4 of each car seat are connected one-to-one with a relay.

[0039] Preferably, the control module 1 sends a first control signal to the relay drive module 2; the relay drive module 2 controls the motor drive module 3 to output a high-level signal or a low-level signal to drive the motor 4 of the car seat according to the first control signal.

[0040] Preferably, the motor drive module 3 outputs a high-level signal to drive the motor 4 of the car seat to rotate forward, or outputs a low-level signal to drive the motor 4 of the car seat to rotate in reverse.

[0041] Preferably, the control module 1 sends a second control signal to the speed control drive module 5; the speed control drive module 5 controls the motor drive module 3 to output a speed control signal to the motor 4 of the car seat according to the second control signal.

[0042] Preferably, the control module 1 includes a controller; the motor drive module 3 includes multiple relay drive MOSFETs; the gates of all relay drive MOSFETs are connected to the controller, the sources of all relay drive MOSFETs are grounded, and the drain of each relay drive MOSFET is connected one-to-one to one end of the coil of a relay.

[0043] Preferably, the motor control system also includes an input voltage; the other end of the coil of all relays is connected to the input voltage; and the normally open contacts of all relays are connected to the input voltage.

[0044] Preferably, if the number of motors 4 in the car seat is n, then the number of relays is n+1; the common contact of one relay is connected to the positive terminal of all motors 4 in the car seat, and the common contacts of the remaining n relays are connected one-to-one to the negative terminal of a motor 4 in the car seat; where n≥1, n∈Z.

[0045] Preferably, the speed control drive module 5 includes a speed control drive MOSFET; all normally closed contacts of the relays are connected to the drain of the speed control drive MOSFET; and the gate of the speed control drive MOSFET is connected to the controller.

[0046] Preferably, the motor control system further includes a current acquisition module 6; the output terminal of the current acquisition module 6 is connected to the input terminal of the control module 1; the second output terminal of the speed control drive module 5 is connected to the input terminal of the current acquisition module 6; the output terminal of the motor drive module 3 is connected to the second input terminal of the speed control drive module 5; the current acquisition module 6 acquires the current information of the motor and sends it to the control module 1.

[0047] Preferably, the current acquisition module 6 includes a sampling resistor and an operational amplifier; the source of the speed-regulating drive MOSFET is connected to one end of the sampling resistor; the other end of the sampling resistor is grounded; the input terminal of the operational amplifier is connected to both ends of the sampling resistor; and the output terminal of the operational amplifier is connected to the controller.

[0048] Specifically, the control module 1 controls the relay drive module 2 to drive the motor drive module 3 to output corresponding high and low levels through IO control signals, thereby controlling the motor 4 of the car seat to rotate forward or backward.

[0049] Specifically, the control module 1 sends a PWM control signal to the speed control drive module 5; the speed control drive module 5 outputs the PWM duty cycle to control the motor drive module 3 to output the corresponding chopper to adjust the speed of the motor 4 of the car seat.

[0050] Specifically, the current acquisition module 6 acquires the current operating current of the motor 4 of the car seat and feeds it back to the control module 1 to realize the current acquisition and fault diagnosis of the motor 4 of the car seat.

[0051] Example 2

[0052] like Figures 2-4 As shown, the car seat motor control system of this embodiment has motor 1, motor 2, and motor 3. The controller MCU of this embodiment is U1, the four relay driving MOSFETs of this embodiment are Q1, Q2, Q3, and Q4, the four relays of this embodiment are K1, K2, K3, and K4, the speed control driving MOSFET of this embodiment is Q5, the sampling resistor of this embodiment is R1, and the operational amplifier of this embodiment is U2 with an input voltage of 12V.

[0053] Furthermore, the gates of MOSFETs Q1, Q2, Q3, and Q4 are all connected to controller U1, the drains of MOSFETs Q1, Q2, Q3, and Q4 correspond one-to-one with one end of the coils of relays K1, K2, K3, and K4, and the sources of MOSFETs Q1, Q2, Q3, and Q4 are all grounded.

[0054] Furthermore, the other ends of the coils of relays K1, K2, K3, and K4 are all connected to a 12V input voltage. The normally open contacts of relays K1, K2, K3, and K4 are all connected to a 12V input voltage. The normally closed contacts of relays K1, K2, K3, and K4 are all connected to the drain of MOSFET Q5. The common contact of relay K1 is simultaneously connected to the positive terminals of motors 1, 2, and 3. The common contact of relay K2 is connected to the negative terminal of motor 1. The common contact of relay K3 is connected to the negative terminal of motor 2. The common contact of relay K4 is connected to the negative terminal of motor 3.

[0055] Furthermore, the gate of MOSFET Q5 is connected to controller U1, and the source of MOSFET Q5 is connected to one end of sampling resistor R1; the other end of sampling resistor R1 is grounded. The input of operational amplifier U2 is connected to both ends of sampling resistor R1, and the output of operational amplifier U2 is connected to controller U1.

[0056] The motor control system for a car seat in this embodiment has two operating modes: forward speed regulation and reverse speed regulation.

[0057] The principle of forward speed regulation is as follows (current direction is as follows). Figure 3 As shown):

[0058] 1. When the controller U1 outputs a high level, it controls the MOSFET Q1 to conduct, which drives the relay K1 to close. The common terminal of the relay K1 is connected to the normally open contact and connected to 12V. The positive terminal of the motor 1 is connected to the 12V power supply. At this time, since the MOSFET Q5 is not conducting, the motor 1 does not move.

[0059] 2. Similarly, when controller U1 outputs a high level and simultaneously controls MOSFETs Q3 and Q4 to conduct, the negative terminals of motors 2 and 3 are connected to the 12V power supply, and neither motor 2 nor motor 3 will operate.

[0060] 3. The controller U1 outputs a PWM waveform to control the MOSFET Q5 to conduct. The negative terminal of motor 1 is connected to ground through the normally closed contact of relay Q2 and MOSFET Q5, and motor 1 starts to rotate forward. The controller U1 adjusts the PWM waveform of the output MOSFET Q5 to adjust the speed of motor 1, thereby achieving the purpose of speed regulation.

[0061] 4. Operational amplifier U2 detects the voltage across sampling resistor R1, amplifies it through operations, and feeds it back to controller U1 to detect the operating current of motor 1.

[0062] The principle of reverse speed regulation is as follows (current direction is as follows). Figure 4 As shown):

[0063] 1. When the controller U1 outputs a high level, it controls the MOSFET Q2 to conduct, which drives the relay K2 to close. The common terminal of the relay K2 is connected to the normally open contact and connected to 12V. The negative terminal of the motor 2 is connected to the 12V power supply. At this time, since the MOSFET Q5 is not conducting, the motor 1 does not move.

[0064] 2. Similarly, when controller U1 outputs a low level and simultaneously controls MOSFET Q1 to turn off, relay K1 will open its normally closed contact.

[0065] 3. The controller U1 outputs a PWM waveform to control the MOSFET Q5 to conduct. The positive terminal of motor 1 is connected to ground through the normally closed contact of relay Q1 and MOSFET Q5. Motor 1 starts to reverse. The controller U1 adjusts the PWM waveform of the output MOSFET Q5 to adjust the speed of motor 1, thereby achieving the purpose of speed regulation.

[0066] This embodiment of a car seat motor control system implements a parallel seat motor drive circuit, using one relay to control the positive terminal of all motors, while other relays independently control the negative terminal of the motors, greatly reducing the number of relays used. Taking a requirement of 3 motors as an example, a traditional motor control circuit requires 6 relays, while the control circuit of this patent only requires 4 relays, reducing costs and product size.

[0067] Meanwhile, this embodiment adds a MOSFET to the traditional relay control circuit to chop the ground terminal of the motor, ensuring that the motor can be rotated in both directions and speed can be adjusted, thus solving the drawback that the traditional relay control circuit cannot adjust speed.

[0068] This embodiment describes a motor control system for an automotive seat, which can be specifically applied to ECUs such as seat controllers and domain controllers.

[0069] The embodiments of the motor control system for an automobile seat provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A motor control system for an automotive seat, characterized by, The motor control system comprises a control module (1), a relay drive module (2), a speed regulation drive module (5), and a motor drive module (3). The first output end of the control module (1) is connected with the input end of the relay drive module (2), and the second output end of the control module (1) is connected with the first input end of the speed regulation drive module (5). The output end of the relay drive module (2) is connected with the first input end of the motor drive module (3). The first output end of the speed regulation drive module (5) is connected with the second input end of the motor drive module (3). The motor drive module (3) drives the motor of the automobile seat to rotate forward or reverse. The relay drive module (2) comprises a plurality of relays; the positive poles of the motors of the plurality of automobile seats are connected with the same relay, and the negative poles of the motors of each automobile seat are connected with one relay one by one.

2. The motor control system of an automobile seat according to claim 1, characterized by, The control module (1) sends a first control signal to the relay drive module (2); the relay drive module (2) controls the motor drive module (3) to output a high-level signal or a low-level signal to drive the motor of the automobile seat according to the first control signal.

3. The motor control system of claim 2, wherein The motor drive module (3) outputs a high-level signal to drive the motor of the automobile seat to rotate forward, or outputs a low-level signal to drive the motor of the automobile seat to rotate reverse.

4. The motor control system of claim 1, wherein The control module (1) sends a second control signal to the speed regulation drive module (5); the speed regulation drive module (5) controls the motor drive module (3) to output a speed regulation signal to the motor of the automobile seat according to the second control signal.

5. The motor control system for an automobile seat according to any one of claims 1 to 4, characterized by The control module (1) comprises a controller; the motor drive module (3) comprises a plurality of relay drive MOS tubes; the gates of all the relay drive MOS tubes are connected with the controller, the sources of all the relay drive MOS tubes are grounded, and the drains of each relay drive MOS tube are connected with one end of the coil of one relay one by one.

6. The motor control system of claim 5, wherein The motor control system further comprises an input voltage; the other end of the coil of each relay is connected with the input voltage; and the normally open contact of each relay is connected with the input voltage.

7. The motor control system of claim 6, wherein If the number of the motors of the automobile seats is n, the number of the relays is n+1; one common contact of one relay is connected with the positive poles of all the motors of the automobile seats, and the common contacts of the remaining n relays are connected with the negative poles of the motors of one automobile seat one by one; wherein n≥1, and n∈Z.

8. The motor control system of claim 5, wherein, The speed regulation drive module (5) comprises a speed regulation drive MOS tube; the normally closed contact of each relay is connected with the drain of the speed regulation drive MOS tube; and the gate of the speed regulation drive MOS tube is connected with the controller.

9. The motor control system of claim 8, wherein, The motor control system further comprises a current acquisition module (6); the output end of the current acquisition module (6) is connected with the input end of the control module (1); the second output end of the speed regulation drive module (5) is connected with the input end of the current acquisition module (6); the output end of the motor drive module (3) is connected with the second input end of the speed regulation drive module (5); and the current acquisition module (6) acquires the current information of the motor and sends the current information to the control module (1).

10. The motor control system of claim 9, wherein, The current acquisition module (6) comprises a sampling resistor and an operational amplifier; one end of the sampling resistor is connected to the source of the speed-adjusting driving MOS tube; the other end of the sampling resistor is grounded; the input end of the operational amplifier is connected to the two ends of the sampling resistor; and the output end of the operational amplifier is connected to the controller.

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