Control circuit of time-sharing four-wheel drive transfer case

Abstract

The utility model discloses a control circuit of a time-sharing four-wheel-drive transfer case, which comprises a safe power supply circuit, an interlocking circuit, a preceding-stage relay automatic control unit, a backward-stage drive unit and a signal feedback unit, and the signal feedback unit is connected with the preceding-stage relay automatic control unit. The safety power supply circuit is respectively in circuit connection with the interlocking circuit, the preceding-stage relay automatic control unit and the post-stage driving unit and safely supplies power to the interlocking circuit, the preceding-stage relay automatic control unit and the post-stage driving unit, and the interlocking circuit is connected with the preceding-stage relay automatic control unit, the post-stage driving unit, the signal feedback unit and the execution motor. According to the time-sharing four-wheel-drive transfer case, after the 2H key is pressed for 3 seconds, a main system is controlled to start working, feedback signal transmission and circuit locking are achieved, the time-sharing four-wheel-drive transfer case is controlled to conduct four-wheel-drive high-speed position switching, four-wheel-drive low-speed position switching or two-wheel-drive position switching, the situation that due to the fact that the key is triggered by mistake, the drive mode is changed, the transfer case is damaged is effectively prevented, and the safety during vehicle driving is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of automotive control circuit technology, specifically a control circuit for a part-time four-wheel drive transfer case. Background Technology

[0002] Current off-road vehicles feature part-time four-wheel drive, allowing switching between four-wheel and two-wheel drive via a transfer case. Most current systems use rotary knobs or push-button switches, but both are prone to accidental activation, have long control system response times, slow gear shifting, high failure rates, and can lead to shifting malfunctions. Sudden changes in drive mode under complex road conditions can pose safety hazards. To prevent accidental activation, a novel transfer case control circuit with a relay module design has been developed. Utility Model Content

[0003] The purpose of this invention is to provide a transfer case control circuit with a relay module design, which has a fast response speed, extremely low failure rate, and high safety performance, thus solving the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a control circuit for a time-sharing four-wheel drive transfer case, comprising a safety power supply circuit, an interlock circuit, a front-stage relay automatic control unit, a rear-stage drive unit, and a signal feedback unit. The rear-stage drive unit is connected to the signal feedback unit. The safety power supply circuit is connected to the interlock circuit, the front-stage control unit, and the rear-stage drive unit circuit, respectively, and supplies power to the interlock circuit, the front-stage control unit, and the rear-stage drive unit circuit. The front-stage control unit is connected to the interlock circuit, the signal feedback unit, the rear-stage drive unit, and the actuator motor, respectively.

[0005] Preferably, the interlocking circuit includes a relay, a first field-effect transistor, a second field-effect transistor, a first IC chip, a switch assembly, and a second IC chip connected in sequence. The switch assembly includes switches 2H, 4H, and 4L connected in parallel in sequence. Pins 4 and 1 of the first IC chip are connected to the switch assembly, switch 2H is connected to pins 1 and 6 of the second IC chip, switch 4H is connected to pins 2 and 9 of the second IC chip, and switch 4L is connected to pins 5 and 8 of the second IC chip.

[0006] Preferably, the safety power supply circuit includes a three-terminal voltage regulator integrated circuit and a resistor 2.2 connected in sequence to output a regulated power supply.

[0007] Preferably, the IC chip is model SOT23-6, and its function is to drive after a 3-second delay.

[0008] Preferably, the second IC chip is model CD4011.

[0009] Preferably, pins 9 and 10 of the second IC chip are connected to a third field-effect transistor and a fourth field-effect transistor, respectively.

[0010] Preferably, the front-end automatic control unit includes a 2H relay, a 4H relay, a 4HF relay, and a 4L relay, and the 2H relay, 4H relay, 4HF relay, and 4L relay are connected to the interlock circuit switching signal.

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

[0012] This invention features an interlock circuit. By pressing and holding the 2H key and then lightly touching the switch combination key for 3 seconds, the main control system is safely started. After the system starts, under the action of IC chip two, lightly touching the button switch sends a signal from the front-stage relay automatic control unit to the rear-stage drive unit. The rear-stage drive unit controls the actuator motor to drive the signal feedback unit, and the signal from the feedback unit realizes automatic signal transmission, controlling the transfer case to switch between four-wheel drive and two-wheel drive. This effectively prevents accidental button touches from changing the drive mode, greatly increasing safety when driving. Attached Figure Description

[0013] Figure 1 This is the circuit schematic diagram of this utility model;

[0014] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "horizontal," "vertical," "top," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] Please see Figures 1 to 2The present invention provides an embodiment of a control circuit for a time-sharing four-wheel drive transfer case, comprising a safety power supply circuit 1, an interlock circuit 2, a front-stage relay automatic control unit 3, a rear-stage drive unit 4, and a signal feedback unit 5. The rear-stage drive unit 4 is linked to the actuator motor 6 and the signal feedback unit 5. The safety power supply circuit 1 is connected to the interlock circuit 2, the front-stage relay automatic control unit 3, and the rear-stage drive unit 4 respectively, and the interlock circuit 2 provides a start signal to the safety power supply circuit 1. The front-stage relay automatic control unit 3 and the rear-stage drive unit 4 are powered by circuits. The interlock circuit 2 is connected to the signal feedback unit 5 of the front-stage control unit 3 and the rear-stage drive unit 4, and the actuator motor 6, respectively. The actuator motor 6 is used to connect and control the transfer case. When any switch in the interlock circuit 2 switch assembly is touched, the front-stage automatic control unit receives a signal and synchronously controls the rear-stage drive unit. The actuator motor 6 drives the signal feedback unit 5 to realize signal transmission and automatic control. When four-wheel drive is needed, press and hold the 2H key combination key for 3 seconds to start the system. Under the action of IC chip 2, the tactile switch assembly needs to be pressed briefly to realize feedback signal transmission, circuit locking, and control the transfer case to automatically switch between four-wheel drive high speed, four-wheel drive low speed, and two-wheel drive. It also effectively prevents the change of drive mode caused by accidental button touch, greatly increasing the safety when driving.

[0018] In this embodiment, the signal feedback unit 5 is an coded position sensor.

[0019] The interlock circuit 2 includes MOSFET 1, MOSFET 2, IC chip 1, switch assembly, and IC chip 2 connected in sequence. The switch assembly includes tactile switch 2H, tactile release switch 4H, and tactile switch 4L connected in parallel in sequence. Pins 4 and 5 of IC chip 1 are connected to the switch assembly to form a circuit for backflow communication. Switch 2H is connected to pins 1 and 6 of IC chip 2, switch 4H is connected to pins 2 and 9 of IC chip 2, and switch 4L is connected to pins 5 and 8 of IC chip 2.

[0020] The safety power supply circuit 1 includes a main power relay J5, and also includes a three-terminal voltage regulator integrated circuit and a 2.2-ohm current-limiting fuse resistor connected in sequence to circuit 2. The safety power supply circuit 2 is connected to the 12V ACC power supply controlled by the key. The voltage is reduced to 5V through the three-terminal voltage regulator integrated circuit and the resistor 2.2 to supply power to the interlock circuit 2.

[0021] The IC chip is model SOT23-6, and its function is to output a safety signal to start the system after a 3-second delay.

[0022] The model number of IC chip 2 is CD4011.

[0023] Pins 9 and 10 of IC chip 2 are connected to MOSFET 3 and MOSFET 4, respectively.

[0024] Working principle: ACC power supply to interlock circuit 2. Press and hold K1 power switch for 3 seconds. IC chip SOT23-6 delays for 3 seconds and outputs a high-level signal at pin 1, triggering MOS1 to MOS2. MOS2 controls the main power relay J5 to open. At the same time, pin 1 of IC2 outputs a signal to MOS1 to control MOS2 to the front-stage relay module 3. 2H relay receives the signal, 2H relay is energized, 2H position is locked, 2H indicator light is constantly on, maintaining the vehicle in two-wheel drive driving state, waiting for the 4H or 4L command.

[0025] When switching to high-speed four-wheel drive by pressing switch K2, pin 2 of IC chip integrated circuit CD4011 is triggered to a low level. 2MOS1 controls 2MOS2 to disconnect the signal, the front-stage 2H relay is released, the 4H relay is energized, the rear-stage drive relay is energized, and the actuator motor 6 starts working. The working process takes about 2 to 4 seconds. When the actuator motor 6 rotates to the 4H high-speed four-wheel drive position of the transfer case, the position sensor signal is fed back to the 4H relay, the 4H relay circuit is disconnected, the rear-stage drive unit stops outputting signals, the actuator motor stops working, the 4H position is locked, and the 4H indicator light stays on, indicating that the system has executed successfully.

[0026] When switching to low-speed four-wheel drive by pressing switch K3, pin 5 of IC2 integrated circuit CD4011 outputs a signal to 2MOS3, which controls 2MOS4 to output a low level and engage the 4L relay. This engages the subsequent drive relay, causing the actuator motor to start. The process takes approximately 2 to 4 seconds. When the actuator motor rotates to the 4L low-speed four-wheel drive position in the transfer case, the position sensor signal is fed back to the 4L front relay, the 4L relay circuit is disconnected, the subsequent drive unit stops outputting signals, the actuator motor stops working, the 4L position is locked, and the 4L indicator light remains on, indicating that the system has executed successfully.

[0027] When switching to high-speed four-wheel drive by pressing switch K1, pin 1 of IC2 integrated circuit CD4011 outputs a signal to 2MOS1, controlling 2MOS2 to output a low level. Relay 2H is activated, which in turn activates the subsequent drive relay, causing motor 6 to work. The process takes approximately 4 to 6 seconds. When the actuator motor rotates to the high-speed position of two-wheel drive in the transfer case (2H), the position sensor signal is fed back to the 2H front relay, the 2H relay circuit is disconnected, the subsequent drive unit stops outputting signals, the actuator motor stops working, the 2H two-wheel drive position is locked, and the 2H indicator light remains on, indicating that the system has executed successfully.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A control circuit for a time-sharing four-wheel drive transfer case, characterized by: It includes a safety power supply circuit, an interlock circuit, a front-stage relay automatic control unit, a rear-stage drive unit, and a signal feedback unit. The signal feedback unit is connected to the front-stage relay automatic control unit. The safety power supply circuit is connected to the interlock circuit, the front-stage relay automatic control unit, and the rear-stage drive unit circuit respectively, and safely supplies power to the interlock circuit, the front-stage relay automatic control unit, and the rear-stage drive unit circuit. The interlock circuit is connected to the front-stage control unit, the rear-stage drive unit, the signal feedback unit, and the actuator motor respectively.

2. The control circuit of a time-sharing four-wheel drive transfer case according to claim 1, characterized in that: The interlocking circuit includes a relay, a field-effect transistor (FET), a field-effect transistor (FET), an IC chip, a switch assembly, and an IC chip, all connected in sequence. The switch assembly includes a tactile switch 2H, a switch 4H, and a switch 4L, all connected in sequence. Pin 4 of IC chip 1 and pin 1 of IC chip 2 are connected to form a start and switch assembly. Switch 2H is connected to pins 1 and 6 of IC chip 2, switch 4H is connected to pins 2 and 9 of IC chip 2, and switch 4L is connected to pins 5 and 8 of IC chip 2.

3. A control circuit for a time-sharing four-wheel drive transfer case according to either one of claims 1 or 2, characterized in that: The safety power supply circuit includes a three-terminal voltage regulator integrated circuit and a resistor connected in sequence.

4. The control circuit of a time-sharing four-wheel drive transfer case according to claim 2, wherein: The IC chip is model SOT23-6, and its function is to drive the power-on signal after a 3-second delay.

5. The control circuit of a time-sharing four-wheel drive transfer case according to claim 2, wherein: The second IC chip is model CD4011.

6. A control circuit for a time-sharing four-wheel drive transfer case according to any one of claims 2 or 5, characterized in that: Pins 9 and 10 of IC chip 2 are connected to field-effect transistor 3 and field-effect transistor 4, respectively.

7. The control circuit of a time-sharing four-wheel drive transfer case according to claim 1, wherein: The front-stage relay automatic control unit includes 2H relay, 4H relay, 4HF relay and 4L relay, and the 2H relay, 4H relay, 4HF relay and 4L relay are connected to the interlock circuit and the rear-stage drive unit.

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