Automobile front cover anti-pinch system, control method and automobile

Abstract

The invention relates to the technical field of automobile safety, in particular to an automobile front cover anti-pinch system, a control method and an automobile. Comprising a front cover, a lock body assembly, a driving mechanism, a sensing unit and an electronic control unit, the sensing unit comprises a gap sensor used for detecting a gap value between the front cover and the matching surface of the automobile body; and the electronic control unit is electrically connected with the sensing unit, the driving mechanism and a pull-in motor of the lock body assembly respectively. Wherein the electronic control unit is configured to obtain a gap value detected by the gap sensor after receiving a closing instruction, and when the gap value is smaller than or equal to a preset threshold value, the suction motor is started to execute locking; when the gap value is larger than a preset threshold value, the driving mechanism is controlled to execute ejection action so as to adjust the position of the front cover, and after adjustment, when the gap value is smaller than or equal to the preset threshold value again, the suction motor is started to execute locking. Through the logic of first aligning and then sucking, the potential safety hazard of hand clamping in a semi-locking state is eliminated, and the appearance levelness after the front cover is closed is ensured.

Description

Technical Field

[0001] This invention relates to the field of automotive safety technology, and in particular to an anti-pinch system for a car hood, a control method, and a car. Background Technology

[0002] Traditional car hoods typically use a "half-lock detection" logic during the closing process: when the latch engages the lock body to the half-lock position, the magnetic motor activates, pulling the hood into a fully locked position. This method poses a safety hazard: in the half-lock state, there is often a large gap (usually greater than 5mm) between the hood and the front bumper, large enough to accommodate a finger. If the hood is closed directly at this point, a finger pinching accident is highly likely. Furthermore, due to manufacturing tolerances or assembly errors, the hood may tilt up on one side or be misaligned with the bumper after closing, affecting the appearance. While existing technologies include torque detection to prevent pinching, these only identify the clamping force already applied and cannot fundamentally prevent the risk of pinching due to premature engagement, nor can they solve the alignment problem after the hood is closed. Summary of the Invention

[0003] The purpose of this invention is to provide an anti-pinch system, control method and automobile for the front hood of a car, so as to solve the technical problems of hand pinching safety hazards caused by premature closing of the front hood when the hood is closed, and the impact on appearance caused by the front hood not being flush with the bumper after closing.

[0004] In a first aspect, the present invention provides an anti-pinch system for a car hood, comprising: The lock assembly, located inside the vehicle body, is used for locking the front cover; A drive mechanism, located inside the vehicle body, is used to adjust the position of the front hood; The sensing unit includes a gap sensor for detecting the gap value between the front cover and the body mating surface; And an electronic control unit, which is electrically connected to the sensing unit, the drive mechanism and the locking motor of the lock body assembly respectively; The electronic control unit is configured to: upon receiving a closing command, if the gap value detected by the gap sensor is less than or equal to a preset threshold, activate the suction motor to perform locking; if the gap value is greater than the preset threshold, control the drive mechanism to adjust the position of the front cover.

[0005] In an optional implementation, the drive mechanism includes: A bracket, which is fixed to the side of the lock body assembly; A drive motor, which is fixed on the bracket; A transmission gear set, wherein the transmission gear set is connected to the output end of the drive motor; A lead screw, which is rotatably mounted on the bracket and is connected to the output end of the transmission gear set; And a slider, which is threadedly engaged with the lead screw and is capable of linear movement along the lead screw; When the gap value detected by the gap sensor is greater than the preset threshold, the electronic control unit controls the drive motor to rotate forward, driving the slider to extend and lift the front cover.

[0006] In an optional embodiment, the transmission gear set includes: The first-stage intermediate gear is connected to the motor shaft of the drive motor; And a second-stage output gear, which is connected to the lead screw and meshes with the first-stage intermediate gear.

[0007] In an optional embodiment, the lead screw is a trapezoidal threaded lead screw; the slider includes: ontology; And a nut, which is embedded inside the body and engages with the lead screw thread.

[0008] In an optional embodiment, the drive mechanism further includes: A buffer pad is provided on the top of the slider; And / or, a limiting boss is provided on the top of the slider, the limiting boss being used to push the ratchet inside the lock body assembly.

[0009] In an optional implementation, the preset threshold is 1mm, and the electronic control unit controls the drive motor to extend the slider by an amount of 0.5-3mm.

[0010] Secondly, the present invention provides a method for controlling the anti-pinch function of a car hood, used to control the anti-pinch system of a car hood as described in any of the foregoing embodiments, the method comprising the steps of: In response to the hood closing command, obtain the real-time gap value between the hood and the body matching surface; Determine whether the real-time gap value is less than or equal to a preset threshold; If so, the locking mechanism of the lock body assembly will be activated directly to lock the lock. If not, the control drive mechanism will perform an ejection action to adjust the position of the front cover until the real-time gap value is less than or equal to the preset threshold, and then the suction motor will be started to perform locking.

[0011] In an optional implementation, the step control drive mechanism performs the ejection action to adjust the position of the front cover, including: The drive motor controlling the drive mechanism rotates forward, driving the slider to extend through the transmission gear set and lead screw, lifting the front end of the front cover by 1-3mm; The drive motor is reversed, causing the slider to retract and the front cover to descend under gravity. During the descent, the real-time gap value is continuously monitored. When the real-time gap value is less than or equal to the preset threshold again, the ejection action is stopped.

[0012] In an optional implementation, after the step of activating the suction motor to perform the locking, a fine-tuning step is also included: Obtain the static gap value between the front cover and the body matching surface again; If the static gap value is greater than the design tolerance, the drive motor of the control mechanism is rotated forward, and the front cover is lifted by 0.5-1mm through the slider so that the front cover is flush with the body matching surface. Then the drive motor is powered off.

[0013] Thirdly, the present invention provides an automobile, including the anti-pinch system for the front hood as described in any of the foregoing embodiments.

[0014] Compared with the prior art, the technical advantages of the anti-pinch system, control method and automobile provided by the present invention are as follows: The present invention provides an anti-pinch system for a car hood, comprising: a lock assembly disposed inside the vehicle body for locking the hood; a drive mechanism disposed inside the vehicle body for adjusting the position of the hood; a sensing unit including a gap sensor for detecting the gap value between the hood and the matching surface of the vehicle body; and an electronic control unit electrically connected to the sensing unit, the drive mechanism, and the locking motor of the lock assembly, respectively; the electronic control unit is configured to: upon receiving a closing command, when the gap value detected by the gap sensor is less than or equal to a preset threshold, activate the locking motor to perform locking; when the gap value is greater than the preset threshold, control the drive mechanism to adjust the position of the hood.

[0015] By using a gap sensor to detect the gap between the hood and the body surface in real time, and then using an electronic control unit to control the activation timing of the suction motor based on this gap value, the suction action is only triggered when the gap value reaches a preset threshold (i.e., the hood and bumper are basically flush). This fundamentally changes the traditional "half-lock, then suction" logic, eliminating the safety hazard of fingers being pinched due to excessive gaps in the half-locked state. At the same time, since the suction action is performed only after the hood and bumper are aligned, it avoids the problem of uneven closure caused by premature suction, ensuring the aesthetic appearance of the hood when closed. Through the combination of sensor detection and logic control, the dual technical problems of safety anti-pinch and closure alignment are solved simultaneously in a simple and reliable way.

[0016] The anti-pinch control method for the car hood provided by this invention is used to control the aforementioned anti-pinch system for the car hood. Therefore, the technical advantages and effects achieved by this method include those achieved by the aforementioned anti-pinch system for the car hood, which will not be elaborated here.

[0017] The automobile provided by this invention includes the aforementioned anti-pinch system for the automobile hood. Therefore, the technical advantages and effects achieved therefrom include those achieved by the aforementioned anti-pinch system for the automobile hood, which will not be elaborated here.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram showing the positions of the lock body assembly and the drive mechanism provided in an embodiment of the present invention; Figure 2 An exploded view of the drive mechanism provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the front cover provided in an embodiment of the present invention.

[0021] Icons: 1-Front cover; 2-Lock body assembly; 3-Drive mechanism; 4-Bracket; 5-Drive motor; 6-Trapezoidal threaded screw; 7-Slider; 8-First stage intermediate gear; 9-Second stage output gear; 10-Ratchet; 11-Pawl; 12-Anti-pinch bar; 13-Bearing. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention 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 invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0029] The specific structure is as follows: Figures 1 to 3 As shown.

[0030] This embodiment provides an anti-pinch system for a car hood, including: a hood 1; a lock assembly 2, which is disposed inside the hood 1 for locking the hood 1; a drive mechanism 3, which is disposed on the side of the lock assembly 2 for lifting the hood 1; a sensing unit, which includes a gap sensor for detecting the gap value between the hood 1 and the body matching surface; and an electronic control unit, which is electrically connected to the sensing unit, the drive mechanism 3, and the suction motor of the lock assembly 2; wherein, the electronic control unit is configured to: upon receiving a closing command, acquire the gap value detected by the gap sensor; when the gap value is less than or equal to a preset threshold, activate the suction motor to perform locking; when the gap value is greater than the preset threshold, control the drive mechanism 3 to perform a pushing action to adjust the position of the hood 1; and after adjustment, when the gap value is again less than or equal to the preset threshold, activate the suction motor to perform locking.

[0031] In this embodiment, a gap sensor is used to detect the gap value between the hood 1 and the body surface in real time. The electronic control unit controls the start timing of the suction motor based on this gap value, ensuring that the suction action is triggered only when the gap value reaches a preset threshold (i.e., the hood 1 is basically flush with the bumper). This fundamentally changes the traditional "half-lock, then suction" logic, eliminating the safety hazard of fingers being pinched due to excessive gaps in the half-locked state. Simultaneously, since the suction action is performed only after the hood 1 is aligned with the bumper, it avoids the problem of uneven closure caused by premature suction, ensuring the aesthetic appearance of the hood 1 after closure. Through the combination of sensor detection and logic control, the dual technical problems of safety anti-pinch and closure alignment are solved simultaneously in a simple and reliable manner.

[0032] Specifically, the car hood anti-pinch system includes the hood 1, the lock assembly 2, the drive mechanism 3, the sensing unit, and the electronic control unit (ECU).

[0033] The front cover 1 is a cover for the front compartment of the vehicle, and an anti-pinch strip 12 is embedded in its front edge. The anti-pinch strip 12 is located at the connection between the front cover 1 and the front compartment and is used to detect direct obstacles during the closing process. When the anti-pinch strip 12 is squeezed, its internal sensor sends a signal to the electronic control unit as an auxiliary means of safety protection.

[0034] In this embodiment, the lock assembly 2 is disposed inside the front cover 1 and is used to lock the front cover 1. The lock assembly 2 includes a ratchet 10 and a pawl 11. The ratchet 10 is used to engage with a latch provided on the vehicle body, and the pawl 11 is used to lock or release the ratchet 10. The lock assembly 2 also includes a pull-in motor, which drives the pawl 11 to rotate the ratchet 10 from the half-lock position to the fully locked position, thus completing the final locking of the front cover 1.

[0035] In this embodiment, the drive mechanism 3 is located on the side of the lock body assembly 2 and is used to lift the front cover 1. The drive mechanism 3 in this embodiment includes a bracket 4, a drive motor 5, a transmission gear set, a trapezoidal threaded screw 6, and a slider 7.

[0036] In this embodiment, the bracket 4 is fixed to the side of the lock body assembly 2. The bracket 4 is preferably made of high-strength aluminum alloy die casting, and its interior is provided with a dovetail-shaped guide groove to guide the linear movement of the slider 7. The bracket 4 is also provided with multiple mounting holes and positioning bosses for fixing the drive motor 5 and supporting the trapezoidal threaded screw 6.

[0037] In this embodiment, the drive motor 5 is fixed to the bracket 4. The drive motor 5 is preferably a 24V DC brushed motor with a built-in overheat protection circuit, and is secured to the bracket 4 with screws. The output end of the drive motor 5 is connected to a motor shaft for outputting rotational power. Alternatively, the drive motor 5 can also be a DC brushless motor, which, in conjunction with an encoder, achieves more precise position and speed control.

[0038] In this embodiment, the transmission gear set is connected to the output end of the drive motor 5. The transmission gear set includes a first-stage intermediate gear 8 and a second-stage output gear 9, forming a two-stage reduction transmission mechanism. The first-stage intermediate gear 8 is connected to the motor shaft of the drive motor 5, specifically via a key connection or interference fit. The second-stage output gear 9 is connected to the trapezoidal threaded screw 6 and meshes with the first-stage intermediate gear 8. By designing the gear ratio between the first-stage intermediate gear 8 and the second-stage output gear 9, a reduction and torque increase effect can be achieved; for example, a transmission ratio of 5:1 to 10:1 can be set to provide sufficient output force. Alternatively, the transmission gear set can also employ a planetary gear reducer or a multi-stage gear combination to meet the space and torque requirements of different vehicle models.

[0039] In this embodiment, the trapezoidal threaded screw 6 is rotatably mounted on the bracket 4 and is connected to the output end of the transmission gear set. Specifically, one end of the trapezoidal threaded screw 6 is supported on the bracket 4 by a bearing 13, and the other end is fixedly connected to the second-stage output gear 9. The trapezoidal threaded screw 6 uses a trapezoidal thread and is made of alloy steel (such as 40Cr), which has undergone heat treatment and surface hardening to ensure transmission accuracy and wear resistance. The trapezoidal thread has good self-locking characteristics, which can maintain the position of the slider 7 after the drive motor 5 is powered off, preventing the front cover 1 from accidentally falling back. As an alternative, a ball screw can be used instead of the trapezoidal threaded screw 6 to obtain higher transmission efficiency and lower frictional resistance, but a braking mechanism needs to be added to maintain the position holding function.

[0040] In this embodiment, the slider 7 is threadedly engaged with the trapezoidal threaded screw 6 and moves linearly along the trapezoidal threaded screw 6 under the guidance and constraint of the bracket 4. The slider 7 includes a slider body and a nut, the nut being embedded inside the slider body and threadedly engaged with the trapezoidal threaded screw 6. The slider body is preferably made of aluminum alloy to reduce weight, and the nut is preferably made of self-lubricating bronze to form a helical transmission pair, reduce the coefficient of friction, and extend service life. The top of the slider 7 is wedge-shaped or flat, used to contact the inner plate of the front cover 1. When the drive motor 5 rotates forward, the trapezoidal threaded screw 6 rotates, driving the slider 7 to extend axially (pointing towards the front of the vehicle), the top of the slider 7 contacts the inner plate of the front cover 1 and lifts the front end of the front cover 1; when the drive motor 5 rotates in reverse, the slider 7 retracts, and the front cover 1 falls back under the action of gravity.

[0041] To further enhance the functionality of the slider 7, a polyurethane buffer pad can be installed on the top of the slider 7 to cushion the impact force when the slider 7 contacts the inner plate of the front cover 1, preventing abnormal noise or damage to the contact surface. Simultaneously, a limiting boss can be installed on the top of the slider 7, which pushes the ratchet 10 inside the lock body assembly 2. When the slider 7 extends, the limiting boss pushes the ratchet 10 to rotate, releasing the latch from the ratchet 10 and resetting the ratchet 10 to the unlocked state, thereby eliminating accidental locking caused by force.

[0042] In this embodiment, the sensing unit includes a gap sensor, which is disposed on the front cover 1 or the body mating surface to detect the gap value between the front cover 1 and the body mating surface. Preferably, the gap sensor can be a laser sensor, an ultrasonic sensor, or a contact displacement sensor, with a detection accuracy of 0.1mm. To further improve reliability, two gap sensors can be set, located on the left and right sides of the front cover 1 respectively. The electronic control unit takes the maximum value of the two sensors as the judgment basis to ensure that the system can still work normally even if one side of the sensor fails.

[0043] In this embodiment, the electronic control unit (ECU) is electrically connected to the sensing unit, the drive mechanism 3, and the engaging motor of the lock assembly 2, respectively, and is used to receive the detection signals from the sensing unit and send control commands to the drive mechanism 3 and the engaging motor according to preset logic.

[0044] This embodiment provides a method for controlling the anti-pinch function of a car hood, which is used to control the aforementioned anti-pinch system for a car hood. Therefore, the technical advantages and effects achieved by this method include those achieved by the aforementioned anti-pinch system for a car hood, which will not be elaborated here.

[0045] Specifically, the core control logic of this embodiment is as follows: The electronic control unit (ECU) is configured to acquire the gap value detected by the gap sensor after receiving a closing command. When the gap value is less than or equal to a preset threshold, the ECU directly starts the suction motor to perform locking. When the gap value is greater than the preset threshold, the ECU controls the drive mechanism 3 to perform an ejection action to adjust the position of the front cover 1, and after adjustment, when the gap value is again less than or equal to the preset threshold, it starts the suction motor to perform locking. Preferably, the preset threshold is set to 1mm. This threshold setting takes into account the minimum thickness of a human finger (usually, the thickness of an adult finger is greater than 5mm), ensuring that fingers cannot be inserted when the gap value is ≤1mm, completely eliminating the risk of pinching; it also takes into account the requirements of appearance alignment, when the gap value is ≤1mm, it is visually basically flush, meeting the aesthetic requirements.

[0046] The complete workflow of this embodiment.

[0047] When the user closes the hood 1, the latch of the hood 1 engages with the lock body assembly 2, and the ratchet 10 rotates to the half-lock position, triggering a half-lock signal. The system wakes up the electronic control unit (ECU) and the gap sensor. The ECU enters standby mode, and the gap sensor begins to detect the gap value S between the edge of the hood 1 and the front bumper in real time, continuously acquiring the data at a preset frequency (e.g., 10Hz) and transmitting the detection signal to the ECU in real time.

[0048] The electronic control unit (ECU) compares the received gap value S with a preset threshold T (T=1mm). If S≤1mm, it is determined to be fully aligned. The ECU then sends a control signal directly to the engagement motor of the lock body assembly 2, driving the pawl 11 to disengage. The ratchet 10 rotates to the fully locked state under the action of the spring force, and the front cover 1 is closed.

[0049] If S > 1mm, it is determined to be misaligned or there is a risk of interference, and the system enters the active anti-pinch / correction mode. The electronic control unit (ECU) starts the drive motor 5 to rotate forward. The power is transmitted to the trapezoidal threaded screw 6 after being reduced and increased in torque by the first-stage intermediate gear 8 and the second-stage output gear 9. The trapezoidal threaded screw 6 rotates, driving the slider 7 to extend axially (pointing towards the front of the vehicle). The polyurethane buffer pad on the top of the slider 7 contacts the inner plate of the front cover 1, lifting the front end of the front cover 1 a predetermined distance. This predetermined distance is 1~3mm, and the specific value can be dynamically adjusted according to the vehicle model and the actual gap value. This action, on the one hand, releases the latch from the ratchet 10, allowing the ratchet 10 to return to the unlocked state, eliminating accidental locking caused by force; on the other hand, it provides space for the front cover 1 to fall and realign.

[0050] After the front cover is ejected into position, the electronic control unit (ECU) controls the drive motor 5 to reverse, and the slider 7 slowly retracts. The front cover 1 descends smoothly under gravity, and the gap sensor continuously monitors the gap value S. The retraction speed of the slider 7 is controlled by the rotational speed of the drive motor 5 to ensure a smooth descent of the front cover 1 and avoid impact.

[0051] When the gap sensor detects that the gap value S is ≤1mm again during the descent, the electronic control unit (ECU) immediately cuts off the power to the drive motor 5 and starts the engagement motor of the lock body assembly 2. The ratchet 10 rotates smoothly to the fully locked position to complete the locking.

[0052] In this embodiment, after completing the above-mentioned locking process, if a slight deviation in the static gap value occurs due to gravity settling or assembly tolerances, the system can also perform a minor appearance adjustment function. Specifically, after the locking is performed by the suction motor, the electronic control unit (ECU) again acquires the static gap value S' between the front cover 1 and the body matching surface detected by the gap sensor. If the static gap value S' is greater than the design tolerance (e.g., 0.5mm), the ECU controls the drive motor 5 to briefly rotate forward again, lifting the front cover 1 by 0.5~1mm through the slider 7, making the front cover 1 completely flush with the bumper, ensuring an aesthetically pleasing appearance. After this action is completed, the ECU controls the drive motor 5 to be de-energized, using the self-locking characteristic of the trapezoidal threaded screw 6 to maintain the position of the slider 7, keeping the front cover 1 in a flush state.

[0053] It should be noted that this embodiment also provides several alternative drive mechanism implementations. For example, a linear motor can be used instead of the combination of drive motor 5, transmission gear set, trapezoidal threaded screw 6, and slider 7. The linear motor includes a stator and a mover. The stator is fixed on the bracket 4, and the mover is integrally formed with the slider 7. When the electronic control unit (ECU) controls the linear motor to be energized, the mover moves directly along the stator in a straight line, driving the slider 7 to extend or retract. This solution eliminates the transmission gear set and screw-nut pair, resulting in a more compact structure. Alternatively, a small pneumatic cylinder or hydraulic push rod can be used instead of the above combination. The pneumatic cylinder or hydraulic push rod includes a cylinder body and a piston rod. The cylinder body is fixed on the bracket 4, and the free end of the piston rod serves as the ejector actuator. The flow of compressed gas or hydraulic oil is controlled by a solenoid valve to achieve the extension and retraction of the piston rod. This solution has the advantage of high output force. For example, an electromagnet assembly can be used to achieve the ejection function. The electromagnet assembly includes an iron core and a coil. The iron core is slidably set in the guide hole of the bracket 4. When the coil is energized, it generates an electromagnetic force to drive the iron core to extend and lift the front cover 1. After the power is cut off, the iron core retracts under the action of the reset spring. This solution has a simple structure and low cost, and is suitable for appearance fine-tuning scenarios with a short ejection stroke.

[0054] Furthermore, to enhance the reliability and safety of the control method, this embodiment also incorporates a coordinated anti-pinch strategy based on alignment detection with a traditional torque / speed anti-pinch strategy. During the ejection action of the drive mechanism 3 and the alignment and retraction of the front cover 1, the electronic control unit (ECU) simultaneously monitors the operating current of the drive motor 5 (reflecting motor torque) and the pulse frequency of the Hall sensor (reflecting motor speed). When a sudden increase in the current of the drive motor 5 exceeding a preset threshold or an abnormal decrease in motor speed is detected, it is determined that abnormal resistance has been encountered during the ejection or retraction process. The ECU immediately stops the current action and issues an alarm signal. This coordinated anti-pinch strategy complements the core "alignment followed by suction" logic, together forming a comprehensive safety protection system for the entire closing process of the front cover 1.

[0055] In summary, this embodiment uses a gap sensor to detect the gap between the hood 1 and the body's mating surface in real time. The electronic control unit (ECU) then controls the activation timing of the suction motor based on this gap value. This ensures that the suction action is triggered only when the gap value reaches a preset threshold (i.e., the hood 1 is approximately flush with the bumper). This fundamentally changes the traditional "half-lock, then suction" logic, eliminating the safety hazard of fingers being pinched due to excessive gaps in the half-locked state. Furthermore, since the suction action is performed only after the hood 1 is aligned with the bumper, it avoids misalignment caused by premature suction, ensuring the aesthetic appearance of the hood 1 when closed. By combining sensor detection and logic control, this embodiment solves both the safety and anti-pinch issues and the alignment problems in a simple and reliable manner, demonstrating clear industrial application value.

[0056] This embodiment provides a car that includes the aforementioned anti-pinch system for the car hood. Therefore, the technical advantages and effects achieved by this car include those achieved by the aforementioned anti-pinch system for the car hood, which will not be elaborated here.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A car hood anti-pinch system, characterized in that, include: The lock assembly (2) is located inside the vehicle body and is used for locking the front cover (1); The drive mechanism (3) is located inside the vehicle body and is used to adjust the position of the front cover (1); The sensing unit includes a gap sensor for detecting the gap value between the front cover (1) and the body matching surface; And an electronic control unit, which is electrically connected to the sensing unit, the driving mechanism (3) and the locking motor of the lock body assembly (2), respectively; The electronic control unit is configured to: upon receiving a closing command, when the gap value detected by the gap sensor is less than or equal to a preset threshold, start the suction motor to perform locking; when the gap value is greater than the preset threshold, control the drive mechanism (3) to adjust the position of the front cover (1).

2. The anti-pinch system for the car hood according to claim 1, characterized in that, The drive mechanism (3) includes: Bracket (4), the bracket (4) is fixed to the side of the lock body assembly (2); A drive motor (5) is fixed on the bracket (4); A transmission gear set, wherein the transmission gear set is connected to the output end of the drive motor (5); A lead screw, which is rotatably mounted on the bracket (4) and is connected to the output end of the transmission gear set; And a slider (7), which is threadedly engaged with the lead screw and can move linearly along the lead screw; When the gap value detected by the gap sensor is greater than the preset threshold, the electronic control unit controls the drive motor (5) to rotate forward and drives the slider (7) to extend to lift the front cover (1).

3. The anti-pinch system for the car hood according to claim 2, characterized in that, The transmission gear set includes: The first-stage intermediate gear (8) is connected to the motor shaft of the drive motor (5). And a second-stage output gear (9), which is connected to the lead screw and meshes with the first-stage intermediate gear (8).

4. The anti-pinch system for the car hood according to claim 2, characterized in that, The lead screw is a trapezoidal threaded lead screw (6); the slider (7) includes: ontology; And a nut, which is embedded inside the body and engages with the lead screw thread.

5. The anti-pinch system for the car hood according to claim 2, characterized in that, The drive mechanism (3) further includes: A buffer pad is provided on the top of the slider (7); And / or, a limiting boss is provided on the top of the slider (7), the limiting boss being used to push the ratchet (10) inside the lock body assembly (2).

6. The anti-pinch system for the car hood according to claim 2, characterized in that, The preset threshold is 1mm, and the electronic control unit controls the drive motor (5) to drive the slider (7) to extend by an amount of 0.5-3mm.

7. A method for preventing pinching of a car hood, characterized in that, The method for controlling the anti-pinch system for a vehicle hood according to any one of claims 1-6, the method comprising the steps of: In response to the front cover (1) closing command, obtain the real-time gap value between the front cover (1) and the body matching surface; Determine whether the real-time gap value is less than or equal to a preset threshold; If so, the locking motor of the lock body assembly (2) will be started directly to perform the locking; If not, the control drive mechanism (3) performs an ejection action to adjust the position of the front cover (1) until the real-time gap value is less than or equal to the preset threshold, and then the suction motor is started to perform locking.

8. The method for preventing pinching of a car hood according to claim 7, characterized in that, The step control drive mechanism (3) performs the ejection action to adjust the position of the front cover (1), including: The drive motor (5) of the control drive mechanism (3) rotates forward, and drives the slider (7) to extend through the transmission gear set and the lead screw, lifting the front end of the front cover (1) by 1-3mm; Control the drive motor (5) to reverse, causing the slider (7) to retract, and the front cover (1) to descend under the action of gravity; During the descent, the real-time gap value is continuously monitored. When the real-time gap value is less than or equal to the preset threshold again, the ejection action is stopped.

9. The method for preventing pinching of a car hood according to claim 7, characterized in that, After the locking process is initiated by activating the suction motor, a fine-tuning step is also included: Obtain the static gap value between the front cover (1) and the body matching surface again; If the static gap value is greater than the design tolerance, the drive motor (5) of the control drive mechanism (3) is rotated in the forward direction, and the front cover (1) is lifted by 0.5-1mm through the slider (7) so that the front cover (1) is flush with the body matching surface, and then the drive motor (5) is de-energized.

10. A car, characterized in that, The vehicle hood anti-pinch system includes any one of claims 1-6.

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