Automobile parking control system integrated with overcurrent protection function and working method thereof

Abstract

The invention discloses an automobile parking control system integrated with an over-current protection function and a working method thereof, and belongs to the field of automobile braking, the automobile parking control system comprises over-current protection assemblies and a microcontroller module, each over-current protection assembly comprises a high-side current output detection module and a power supply anti-reverse and switch module which are sequentially connected with a system power supply in series, and the microcontroller module comprises a high-side current output detection module and a power supply anti-reverse and switch module; the power supply anti-reversing switch module is connected with one end of the left wheel brake assembly or the right wheel brake assembly, and the other end of the left wheel brake assembly or the right wheel brake assembly is grounded through the low-side current output detection module; the microcontroller module is also connected with the power supply anti-reverse and switch module through the current threshold configuration and decision module; and the microcontroller module is also connected with the high-side current output detection module. According to the automobile parking control system integrated with the over-current protection function and the working method of the automobile parking control system integrated with the over-current protection function, by integrating the over-current threshold value adjusting function and the over-current protection function, when the current value is larger than the over-current threshold value, a power source is rapidly cut off, and internal hardware is protected.

Description

Technical Field

[0001] The invention relates to the technical field of automobile braking, and in particular to an automobile parking control system integrated with an overcurrent protection function and a working method thereof. Background Art

[0002] The main purpose of the existing automobile parking controller is to drive the motor to clamp the brake disc with the caliper, thereby maintaining the vehicle's parking state. Specifically, this process drives the motor through the H-bridge in the circuit module, collects the current and voltage signals at the motor end, and combines the vehicle's status information (such as speed, gear, weight and slope) to enable the parking system to provide appropriate parking force to complete the vehicle's parking function.

[0003] When the vehicle is parking, if there is a short circuit inside the motor or a short circuit to the ground of the external power supply of the controller, due to the characteristics of the vehicle fuse itself, its fusing time is uncontrollable (the fusing time is usually between 10 milliseconds and 1000 milliseconds). This uncertainty will cause overheating inside the controller and eventually lead to permanent failure. In this case, a new parking controller must be replaced before the vehicle can resume parking function.

[0004] In addition, the loads and working conditions of different vehicles vary greatly, so the parking current required to complete the parking function will also be different. This requires different fuse selections for various models to ensure the reliability and safety of the system. However, this diverse selection work will bring additional workload and complexity.

[0005] In summary, although the existing automobile parking control system can effectively realize the parking function, there are certain risks when facing fault conditions such as short circuits, and detailed fuse selection is required according to different vehicle models, which increases the complexity of design and maintenance. Summary of the invention

[0006] The purpose of the present invention is to provide a vehicle parking control system integrated with an overcurrent protection function to solve the above technical problems.

[0007] To achieve the above-mentioned purpose, the present invention provides an automobile parking control system integrated with an overcurrent protection function, comprising a power module, a left wheel brake assembly, a right wheel brake assembly, an overcurrent protection assembly and a microcontroller module, wherein the microcontroller module is connected to a vehicle controller via a communication module and a switch interface module respectively, and the overcurrent protection assembly comprises a high-side current output detection module and a power reverse protection and switch module which are sequentially connected in series with a system power supply, the power reverse protection and switch module is connected to one end of the left wheel brake assembly or the right wheel brake assembly, and the other end of the left wheel brake assembly or the right wheel brake assembly is grounded via a low-side current output detection module, and the low-side current output detection module is connected to the microcontroller module; The microcontroller module is also connected to the power anti-reverse and switch module via the current threshold configuration and decision module, and is used to control the opening and closing of the power anti-reverse and switch module according to the configuration strategy of the current threshold configuration and decision module; The microcontroller module is also connected to the high-side current output detection module and is used for receiving the high-side current value collected by the high-side current output detection module.

[0008] Preferably, the high-side current output detection module includes a high-side current sampling resistor R1 having one end connected in series with the system power supply and a current amplifier Q9 connected in parallel with the high-side current sampling resistor R1. The current amplifier Q9 is connected to the microcontroller module via the high-side current detection voltage output signal port V1.

[0009] Preferably, the power supply reverse connection prevention and switch module includes a protection MOS tube Q10 and an anti-reverse connection MOS tube Q11 which are sequentially connected in series with the other end of the high-side current sampling resistor R1, the drain of the protection MOS tube Q10 is connected to the high-side current sampling resistor R1, the source of the protection MOS tube Q10 is connected to the source of the anti-reverse connection MOS tube Q11, the gate of the protection MOS tube Q10 is connected to the gate of the protection MOS tube Q11, and a current threshold configuration and decision module is connected between the gate of the protection MOS tube Q10 and the gate of the protection MOS tube Q11; The drain of the protection MOS tube Q11 outputs the system power supply signal to the left wheel brake assembly or the right wheel brake assembly.

[0010] Preferably, the current threshold configuration and decision module is configured to start the protection MOS tube Q10 when the current value detected by the high-side current detection module is within the maximum operating current value range, and to turn off the MOS tube Q10 when the current value detected by the high-side current detection module is greater than the maximum parking current value; The maximum operating current value is the current when the brake motor of the left wheel brake assembly and the brake motor of the right wheel brake assembly are operating normally, and the maximum parking current value is the current value at the maximum slope and the highest temperature verified by actual vehicle calibration.

[0011] Preferably, the microcontroller module is connected to the brake motor of the left wheel brake assembly and the brake motor of the right wheel brake assembly via the left H-bridge drive module and the right H-bridge drive module respectively, and the left wheel brake assembly and the right wheel brake assembly are both feedback-connected to the microcontroller module via the motor terminal voltage acquisition module.

[0012] Preferably, the motor terminal voltage acquisition module includes a voltage dividing resistor R2 and a voltage dividing resistor R4 which are sequentially connected in series with the positive terminal of the brake motor, and a voltage dividing resistor R3 and a voltage dividing resistor R5 which are sequentially connected in series with the negative terminal of the brake motor, and the voltage dividing resistor R2 and the voltage dividing resistor R4 are connected to the microcontroller module via the motor positive voltage signal output port V2, and the voltage dividing resistor R3 and the voltage dividing resistor R5 are connected to the microcontroller module via the motor negative voltage signal output port V3.

[0013] Preferably, the low-side current output detection module includes a low-side current sampling resistor R6 connected to the left H-bridge driving module or the right H-bridge driving module at one end and a current amplifier Q18 connected in parallel to both ends of the low-side current sampling resistor R6, and the current amplifier Q18 is connected to the microcontroller module via the low-side current detection voltage signal output port V4; The other end of the low-side current sampling resistor R6 is connected to the power ground.

[0014] The working method of the automobile parking control system integrated with the overcurrent protection function comprises the following steps: When the brake motor is in normal operation, the microcontroller module controls the left wheel brake assembly to brake or release through the left H-bridge drive module according to the instructions received from the vehicle controller, or controls the right wheel brake assembly to brake or release through the right H-bridge drive module. At the same time, the positive and negative voltage signals of the brake motor are collected through the motor terminal voltage collection module, and the low-side current value is detected through the low-side current output detection module. When the low-side current value reaches the set maximum parking current value, it is determined that the braking or release is completed; When the brake motor is short-circuited internally and the external power supply of the microcontroller module is short-circuited to the ground, the high-side current value detected by the high-side current output detection module is greater than the maximum parking current value. At this time, the microcontroller module sends a shutdown signal to the power reverse protection and switch module through the current threshold configuration and decision module to turn off the protection MOS tube Q10 to achieve protection.

[0015] Therefore, the present invention adopts the above-mentioned automobile parking control system integrated with the overcurrent protection function, which has the following beneficial effects: 1. By integrating overcurrent threshold adjustment and overcurrent protection functions, the power supply is quickly cut off when the current value is greater than the overcurrent threshold to protect the internal hardware, solving the problem of failure of the parking controller due to external faults, thereby ensuring that the parking system hardware does not fail permanently; 2. The overcurrent threshold can be adjusted through the system, eliminating the need to select an external fuse; 3. The internal power shutoff module can be reused, avoiding the need to replace the external fuse after it blows.

[0016] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural block diagram of a vehicle parking control system integrated with an overcurrent protection function according to the present invention; Figure 2 A circuit diagram of a high-side current output detection module of an automobile parking control system integrated with an overcurrent protection function according to the present invention; Figure 3 A circuit diagram of a power reverse protection and switch module of a vehicle parking control system integrated with an overcurrent protection function according to the present invention; Figure 4 A circuit diagram of an H-bridge driving module of an automobile parking control system integrated with an overcurrent protection function according to the present invention; Figure 5 A circuit diagram of a motor terminal voltage sampling module of an automobile parking control system integrated with an overcurrent protection function according to the present invention; Figure 6 The present invention is a circuit diagram of a low-side current output detection module of an automobile parking control system integrated with an overcurrent protection function. DETAILED DESCRIPTION

[0018] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "setting", "installation", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0020] like Figure 1-Figure 6As shown, a car parking control system with an integrated overcurrent protection function includes a power module, a left wheel brake assembly, a right wheel brake assembly, an overcurrent protection assembly and a microcontroller module. The microcontroller module is connected to the vehicle controller via a communication module and a switch interface module respectively. The overcurrent protection assembly includes a high-side current output detection module and a power anti-reverse and switch module which are sequentially connected in series with the system power supply. The power anti-reverse and switch module is connected to one end of the left wheel brake assembly or the right wheel brake assembly, and the other end of the left wheel brake assembly or the right wheel brake assembly is grounded via a low-side current output detection module, and the low-side current output detection module is connected to the microcontroller module; the microcontroller module is also connected to the power anti-reverse and switch module via a current threshold configuration and decision module, and is used to control the opening and closing of the power anti-reverse and switch module according to the configuration strategy of the current threshold configuration and decision module; the microcontroller module is also connected to the high-side current output detection module, and is used to receive the high-side current value collected by the high-side current output detection module.

[0021] Specifically, the high-side current output detection module includes a high-side current sampling resistor R1 connected in series with the system power supply at one end and a current amplifier Q9 connected in parallel with the high-side current sampling resistor R1. The current amplifier Q9 is connected to the microcontroller module via the high-side current detection voltage output signal port V1.

[0022] The power reverse connection prevention and switch module includes a protection MOS tube Q10 and an anti-reverse connection MOS tube Q11 which are sequentially connected in series with the other end of the high-side current sampling resistor R1, the drain of the protection MOS tube Q10 is connected to the high-side current sampling resistor R1, the source of the protection MOS tube Q10 is connected to the source of the anti-reverse connection MOS tube Q11, the gate of the protection MOS tube Q10 is connected to the gate of the protection MOS tube Q11, and a current threshold configuration and decision module is connected between the gate of the protection MOS tube Q10 and the gate of the protection MOS tube Q11; the drain of the protection MOS tube Q11 outputs a system power supply signal to the left wheel brake assembly or the right wheel brake assembly.

[0023] The working principle of the anti-reverse MOS tube Q11 is as follows: Normal power-on working state: When the positive and negative poles of the system power supply are correctly connected, the anti-reverse MOS tube Q11 is in the on state. In this state, the resistance between the drain (Drain) and the source (Source) of the anti-reverse MOS tube Q11 is very small and almost negligible, so it is equivalent to a closed switch.

[0024] Power reverse connection protection: When the positive and negative poles of the system power supply are mistakenly reversed, the resistance between the drain and source of the anti-reverse connection MOS tube Q11 becomes very high, which is equivalent to a disconnected switch, that is, the anti-reverse connection MOS tube Q11 enters the cut-off state (i.e. disconnected). This can effectively prevent the reverse current from flowing through the MOS tube Q11 to the subsequent circuit, thereby protecting the subsequent circuit from damage by the reverse voltage.

[0025] The current threshold configuration and decision module is configured to start the protection MOS tube Q10 when the current value detected by the high-side current detection module is within the maximum operating current value range, and to turn off the MOS tube Q10 when the current value detected by the high-side current detection module is greater than the maximum parking current value; the maximum operating current value is the current of the brake motor of the left wheel brake assembly and the brake motor of the right wheel brake assembly during normal operation, and the maximum parking current value is the current value at the maximum slope and the highest temperature verified by actual vehicle calibration.

[0026] In this embodiment, actual vehicle calibration is performed for different vehicle configurations to obtain the maximum parking current required by different vehicle configurations, meet the requirements of different vehicle types, and eliminate the need for selecting external fuses.

[0027] The microcontroller module is connected to the brake motor of the left wheel brake assembly and the brake motor of the right wheel brake assembly via the left H-bridge drive module and the right H-bridge drive module respectively. The left wheel brake assembly and the right wheel brake assembly are both connected to the microcontroller module for feedback via the motor terminal voltage acquisition module.

[0028] The motor terminal voltage acquisition module includes a voltage dividing resistor R2 and a voltage dividing resistor R4 which are connected in series with the positive terminal of the brake motor in sequence, and a voltage dividing resistor R3 and a voltage dividing resistor R5 which are connected in series with the negative terminal of the brake motor in sequence, and the voltage dividing resistor R2 and the voltage dividing resistor R4 are connected to the microcontroller module via the motor positive voltage signal output port V2, and the voltage dividing resistor R3 and the voltage dividing resistor R5 are connected to the microcontroller module via the motor negative voltage signal output port V3.

[0029] The low-side current output detection module includes a low-side current sampling resistor R6, one end of which is connected to the left H-bridge driving module or the right H-bridge driving module, and a current amplifier Q18 connected in parallel to both ends of the low-side current sampling resistor R6. The current amplifier Q18 is connected to the microcontroller module via the low-side current detection voltage signal output port V4; the other end of the low-side current sampling resistor R6 is connected to the power ground.

[0030] The working method of the automobile parking control system integrated with the overcurrent protection function comprises the following steps: When the brake motor is in normal operation, the microcontroller module controls the left wheel brake assembly to brake or release through the left H-bridge drive module according to the instructions received from the vehicle controller, or controls the right wheel brake assembly to brake or release through the right H-bridge drive module. At the same time, the positive and negative voltage signals of the brake motor are collected through the motor terminal voltage collection module, and the low-side current value is detected through the low-side current output detection module. When the low-side current value reaches the set maximum parking current value, it is determined that the braking or release is completed; When the brake motor is short-circuited internally and the external power supply of the microcontroller module is short-circuited to the ground, the high-side current value detected by the high-side current output detection module is greater than the maximum parking current value. At this time, the microcontroller module sends a shutdown signal to the power reverse protection and switch module through the current threshold configuration and decision module to turn off the protection MOS tube Q10 to achieve protection.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. An automobile parking control system with an integrated overcurrent protection function, comprising a power module, a left wheel brake assembly, a right wheel brake assembly, an overcurrent protection assembly and a microcontroller module, wherein the microcontroller module is connected to a vehicle controller via a communication module and a switch interface module, and is characterized in that: The overcurrent protection assembly includes a high-side current output detection module and a power reverse protection and switch module which are sequentially connected in series with the system power supply, the power reverse protection and switch module is connected to one end of the left wheel brake assembly or the right wheel brake assembly, the other end of the left wheel brake assembly or the right wheel brake assembly is grounded via a low-side current output detection module, and the low-side current output detection module is connected to the microcontroller module; The microcontroller module is also connected to the power anti-reverse and switch module via the current threshold configuration and decision module, and is used to control the opening and closing of the power anti-reverse and switch module according to the configuration strategy of the current threshold configuration and decision module; The microcontroller module is also connected to the high-side current output detection module and is used to receive the high-side current value collected by the high-side current output detection module.

2. The automobile parking control system with integrated overcurrent protection function according to claim 1, characterized in that: The high-side current output detection module includes a high-side current sampling resistor R1 connected in series with the system power supply at one end and a current amplifier Q9 connected in parallel with the high-side current sampling resistor R1. The current amplifier Q9 is connected to the microcontroller module via the high-side current detection voltage output signal port V1.

3. The automobile parking control system with integrated overcurrent protection function according to claim 2, characterized in that: The power reverse connection protection and switch module includes a protection MOS tube Q10 and an anti-reverse connection MOS tube Q11 which are sequentially connected in series with the other end of the high-side current sampling resistor R1, the drain of the protection MOS tube Q10 is connected to the high-side current sampling resistor R1, the source of the protection MOS tube Q10 is connected to the source of the anti-reverse connection MOS tube Q11, the gate of the protection MOS tube Q10 is connected to the gate of the protection MOS tube Q11, and a current threshold configuration and decision module is connected between the gate of the protection MOS tube Q10 and the gate of the protection MOS tube Q11; The drain of the protection MOS tube Q11 outputs the system power supply signal to the left wheel brake assembly or the right wheel brake assembly.

4. The automobile parking control system with integrated overcurrent protection function according to claim 3 is characterized in that: The current threshold configuration and decision module is configured to start the protection MOS tube Q10 when the current value detected by the high-side current detection module is within the maximum operating current value range, and to turn off the MOS tube Q10 when the current value detected by the high-side current detection module is greater than the maximum parking current value; The maximum operating current value is the current when the brake motor of the left wheel brake assembly and the brake motor of the right wheel brake assembly are operating normally, and the maximum parking current value is the current value at the maximum slope and the highest temperature verified by actual vehicle calibration.

5. The automobile parking control system with integrated overcurrent protection function according to claim 4, characterized in that: The microcontroller module is connected to the brake motor of the left wheel brake assembly and the brake motor of the right wheel brake assembly via the left H-bridge drive module and the right H-bridge drive module respectively. The left wheel brake assembly and the right wheel brake assembly are both connected to the microcontroller module for feedback via the motor terminal voltage acquisition module.

6. The automobile parking control system with integrated overcurrent protection function according to claim 5, characterized in that: The motor terminal voltage acquisition module includes a voltage dividing resistor R2 and a voltage dividing resistor R4 which are connected in series with the positive terminal of the brake motor in sequence, and a voltage dividing resistor R3 and a voltage dividing resistor R5 which are connected in series with the negative terminal of the brake motor in sequence, and the voltage dividing resistor R2 and the voltage dividing resistor R4 are connected to the microcontroller module via the motor positive voltage signal output port V2, and the voltage dividing resistor R3 and the voltage dividing resistor R5 are connected to the microcontroller module via the motor negative voltage signal output port V3.

7. The automobile parking control system with integrated overcurrent protection function according to claim 5, characterized in that: The low-side current output detection module includes a low-side current sampling resistor R6 connected to the left H-bridge driving module or the right H-bridge driving module at one end and a current amplifier Q18 connected in parallel to both ends of the low-side current sampling resistor R6. The current amplifier Q18 is connected to the microcontroller module via the low-side current detection voltage signal output port V4; The other end of the low-side current sampling resistor R6 is connected to the power ground.

8. The working method of the automobile parking control system integrated with overcurrent protection function as claimed in claim 7, characterized in that: The following steps are involved: When the brake motor is in normal operation, the microcontroller module controls the left wheel brake assembly to brake or release through the left H-bridge drive module according to the instructions received from the vehicle controller, or controls the right wheel brake assembly to brake or release through the right H-bridge drive module. At the same time, the positive and negative voltage signals of the brake motor are collected through the motor terminal voltage collection module, and the low-side current value is detected through the low-side current output detection module. When the low-side current value reaches the set maximum parking current value, it is determined that the braking or release is completed; When the brake motor is short-circuited internally and the external power supply of the microcontroller module is short-circuited to the ground, the high-side current value detected by the high-side current output detection module is greater than the maximum parking current value. At this time, the microcontroller module sends a shutdown signal to the power reverse protection and switch module through the current threshold configuration and decision module to turn off the protection MOS tube Q10 to achieve protection.

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