Front cabin cover driving circuit and vehicle

Abstract

The invention discloses a front cabin cover driving circuit and a vehicle, and belongs to the technical field of vehicle control. The front cabin cover driving circuit comprises a first control module used for outputting a power supply enable signal; the second control module comprises a power supply control unit and a driving unit; and the power supply control unit is used for outputting power supply voltage to the driving unit under the condition of receiving the power supply enable signal and the internal enable signal. The first control module and the second control module cooperatively control the driving unit, the second control module needs to receive the power supply enable signal and the internal enable signal generated by the second control module to output the power supply voltage, and power supply cannot be triggered under the condition that any control module breaks down, so that the power supply reliability is improved. The technical problems that a control chip of a single safety level cannot meet the safety requirement needed by unlocking of the front hatch cover, misoperation of a drive circuit is easily caused, and unexpected opening of the front hatch cover is caused are solved.

Description

Technical Field

[0001] This application relates to the field of vehicle control technology, specifically to a front hood drive circuit and a vehicle. Background Technology

[0002] With the development of vehicle electrification, the application of the hood (i.e., the front trunk) in vehicles is becoming increasingly widespread. To improve the user's space utilization experience, the opening and closing of the hood is controlled electronically. However, a single control chip is insufficient to meet the safety requirements of high-risk actions such as hood unlocking. In the event of a failure in a single control chip, the drive circuit may malfunction, causing the hood to open unexpectedly while driving, severely obstructing the driver's view and affecting driving safety. Summary of the Invention

[0003] This invention provides a hood drive circuit and vehicle, aiming to solve the technical problem that a single-level control chip cannot meet the security requirements for hood unlocking, which can easily lead to malfunction of the drive circuit and cause the hood to open unexpectedly.

[0004] In a first aspect, embodiments of this application provide a hood drive circuit, comprising: The first control module is used to output a power enable signal according to the front hood opening command; The second control module is connected to the first control module, and the second control module includes a power supply control unit and a drive unit. The power supply control unit is used to output a power supply voltage when it receives the power supply enable signal and the internal enable signal; wherein the internal enable signal is generated by the second control module according to the internal state; the drive unit is used to output a drive signal according to the power supply voltage to drive the front hatch lock load to perform an action.

[0005] In one embodiment of this application, the first control module includes: The first controller is used to output the hood opening command; An enable control unit is connected to the first controller. The enable control unit has a first switch section connected between a first power supply terminal and the output terminal of the enable control unit. When the hood opening command is valid, the first switch section is turned on so that the enable control unit outputs the power supply enable signal.

[0006] In one embodiment of this application, the enable control unit further includes a first disable unit. The input terminal of the first disable unit is connected to the disable control pin of the first controller, and the output terminal of the first disable unit is connected to the input terminal of the first switch unit. The first disable unit is used to pull down the input terminal voltage of the first switch unit according to the first disable control signal output by the first controller, so as to turn off the first switch unit.

[0007] In one embodiment of this application, the second control module has a second controller, which is connected to the power supply control unit and is used to output the internal enable signal; the power supply control unit includes: The second switch is connected to the power enable signal output terminal of the first control module. The second switch is used to output a switch enable signal according to the power enable signal. The AND gate has its first input connected to the switch enable signal output of the second switch unit, and its second input connected to the internal enable signal output of the second controller. A third switch section is connected between the second power supply terminal and the output terminal of the power supply control unit. The control terminal of the third switch section is connected to the AND gate. The third switch section is used to conduct when the logic signal is valid, so that the power supply control unit outputs the power supply voltage. Specifically, when the AND gate receives the switch enable signal and the internal enable signal, it outputs a valid AND logic signal.

[0008] In one embodiment of this application, both the first controller and the second controller have a first safety level, and the drive signal used to drive the load of the front hood lock has a second safety level, wherein the second safety level is higher than the first safety level.

[0009] In one embodiment of this application, the second control module further includes a second disabling unit. The input terminal of the second disabling unit is connected to the disabling control pin of the second controller, and the output terminal of the second disabling unit is connected to the second input terminal of the AND gate. The second disabling unit is used to pull down the voltage of the second input terminal of the AND gate according to the second disabling control signal output by the second controller, so as to disable the AND logic signal.

[0010] In one embodiment of this application, the driving unit includes a driving chip, the logic pins of which are connected to an external control chip, and the power supply pins of which are connected to the power supply control unit; the output pins of the driving chip are connected to the front hood lock load, and the driving chip is used to output the driving signal according to the control signal output by the control chip and the power supply voltage output by the power supply control unit.

[0011] In one embodiment of this application, the first control module further includes a sampling unit, which is connected to the power supply control unit and is used to sample the power supply voltage and output a sampling signal.

[0012] In one embodiment of this application, the first control module is disposed in a first area of ​​the vehicle, and the second control module is disposed in a second area of ​​the vehicle, wherein the first area and the second area are separated from each other.

[0013] Secondly, embodiments of this application also provide a vehicle, the vehicle including the aforementioned hood drive circuit.

[0014] The beneficial effects of this application are as follows: This application provides a first control module and a second control module to coordinately control the drive unit. The first control module is used to output a power supply enable signal according to the hood opening command. The second control module needs to receive the power supply enable signal and its own internally generated enable signal in order to output the power supply voltage. In the event of a failure of either control module, the power supply cannot be triggered, thereby cutting off the power supply to the drive unit, preventing the drive unit from malfunctioning, and keeping the drive unit in a safe state at all times. This solves the technical problem that a single safety level control chip cannot meet the safety requirements required for hood unlocking, which can easily lead to malfunction of the drive circuit and cause the hood to open unexpectedly. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is an architectural diagram of the hood drive circuit provided in an embodiment of this application; Figure 2 This is a circuit diagram of the enable control unit provided in an embodiment of this application; Figure 3 This is a partial circuit diagram of the power supply control unit provided in an embodiment of this application; Figure 4 This is a partial circuit diagram of the power supply control unit provided in an embodiment of this application; Figure 5 This is a circuit diagram of the data acquisition unit provided in the embodiments of this application; Figure 6 This is a circuit diagram of the driving unit provided in an embodiment of this application; Figure 7 This is a schematic diagram of the vehicle area architecture provided in an embodiment of this application.

[0017] Explanation of reference numerals in the attached figures: 1. First control module; 11. Enable control unit; 111. First switch section; 112. First disabling section; 12. Recovery unit; 13. First controller; 2. Second control module; 21. Power supply control unit; 211. Second switch section; 212. Third switch section; 213. Second disabling section; 22. Drive unit; 23. Second controller; 3. Front hatch lock load; 41. Left side area; 42. Right side area; 43. Rear side area; SG1. Front hatch opening command; SG2. Power supply enable signal; SG3. First disabling control signal; SG4. Internal enable signal; SG5. Second disabling control signal; SG6. Pre-diagnosis signal; R1. First resistor; R2. Second resistor; R3. Third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7, seventh resistor; R8, eighth resistor; R9, ninth resistor; R10, tenth resistor; R11, eleventh resistor; R12, twelfth resistor; R13, thirteenth resistor; R14, fourteenth resistor; R15, fifteenth resistor; R16, sixteenth resistor; R17, seventeenth resistor; R18, eighteenth resistor; R19, nineteenth resistor; R20, twentieth resistor; R21, twenty-first resistor; R22, twenty-second resistor; R23, twenty-third resistor; R24, twenty-fourth resistor; R25, twenty-fifth resistor; R26, twenty-sixth resistor; R27, twenty-seventh resistor; R28, twenty-eighth resistor; R29. Resistor #29; R30, R30; R31, R31; R32, R32; R33, R33; R34, R34; R35, R35; R36, R36; R37, R37; R38, R38; R39, R39; R40, R40; R41, R41; C1, C1 capacitor; C2, C2 capacitor; C3, C3 capacitor; C4 capacitor; C5 capacitor; C6 capacitor; C7 capacitor; C8 capacitor; C9 capacitor; C10 capacitor; C11 capacitor; C11 capacitor; C12 capacitor; C13 capacitor; C 14. Fourteenth capacitor; C15. Fifteenth capacitor; C16. Sixteenth capacitor; C17. Seventeenth capacitor; C18. Eighteenth capacitor; C19. Nineteenth capacitor; C20. Twentieth capacitor; C21. Twenty-first capacitor; C22. Twenty-second capacitor; C23. Twenty-third capacitor; C24. Twenty-fourth capacitor; C25. Twenty-fifth capacitor; C26. Twenty-sixth capacitor; C27. Twenty-seventh capacitor; C28. Twenty-eighth capacitor; C29. Twenty-ninth capacitor; C30. Thirtieth capacitor; C31. Thirty-first capacitor; V1. Supply voltage; V2. Pull-up voltage signal; V3. Sampling signal; V4. Drive signal; D1. First diode; D2. Second diode; D3. Third diode;D4, fourth diode; D5, fifth diode; D6, sixth diode; D7, seventh diode; T1, first transient voltage suppressor diode; T2, second transient voltage suppressor diode; T3, third transient voltage suppressor diode; T4, fourth transient voltage suppressor diode; T5, fifth transient voltage suppressor diode; T6, sixth transient voltage suppressor diode; T7, seventh transient voltage suppressor diode; U1, AND gate; U2, driver chip; B1, first power supply terminal; B2, second power supply terminal; Q1, first switch transistor; Q2, second switch transistor; Q3, third switch transistor; Q4, fourth switch transistor; Q5, fifth switch transistor; Q6, sixth switch transistor; Q7, seventh switch transistor; Q8, eighth switch transistor. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application 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 application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] Embodiments of this application provide a front hood drive circuit, such as Figure 1 As shown, it includes a first control module 1 and a second control module 2.

[0021] The first control module 1 is used to output a power supply enable signal SG2 according to the front hatch opening command SG1; The second control module 2 is connected to the first control module 1, and the second control module 2 includes a power supply control unit 21 and a drive unit 22.

[0022] The power supply control unit 21 is used to output the power supply voltage V1 when it receives the power supply enable signal SG2 and the internal enable signal SG4; wherein the internal enable signal SG4 is generated by the second control module 2 according to the internal state; the drive unit 22 is used to output the drive signal V4 according to the power supply voltage V1 to drive the front hatch lock load 3 to perform the action.

[0023] This application provides a first control module 1 and a second control module 2 to collaboratively control a drive unit 22. The first control module 1 outputs a power supply enable signal SG2 according to the hood opening command SG1. The second control module 2 needs to simultaneously receive the power supply enable signal SG2 and its own internally generated enable signal SG4 in order to output a power supply voltage V1. In the event of a failure of either control module, the power supply cannot be triggered, thereby cutting off the power supply to the drive unit 22, preventing the drive unit 22 from malfunctioning, and ensuring that the drive unit 22 is always in a safe state. This solves the technical problem that a controller with a single safety level cannot meet the safety requirements for hood unlocking, which can easily lead to malfunction of the drive circuit and cause the hood to open unexpectedly.

[0024] In some embodiments, the first control module 1 includes: The first controller 13 is used to output the hood opening command SG1.

[0025] The enable control unit 11 is connected to the first controller 13. The enable control unit 11 has a first switch 111, which is connected between the first power supply terminal B1 and the output terminal of the enable control unit 11. When the hood opening command SG1 is valid, the first switch 111 is turned on so that the output of the enable control unit 11 supplies the power enable signal SG2.

[0026] In some embodiments, such as Figure 2 As shown, the enable control unit 11 includes: The first resistor R1 connects the front hatch opening command input terminal of the first controller 13 to the input voltage terminal.

[0027] The second resistor R2 connects the front hatch opening command input terminal of the first controller 13 to the first switch unit 111.

[0028] The first switch unit 111 includes: The third resistor R3 has its first end connected to the second resistor R2.

[0029] The first switching transistor Q1 in this embodiment is a dual-channel MOSFET. The lower base of the first switching transistor Q1 is connected to the second end of the second resistor R2. The lower emitter of the first switching transistor Q1 is connected to the reference ground, and the upper emitter of the first switching transistor Q1 is connected to the first power supply terminal B1.

[0030] The first capacitor C1 has its first terminal connected to the lower base of the first switching transistor Q1, and its second terminal connected to the reference ground for filtering.

[0031] The fourth resistor R4 has its first end connected to the lower collector of the first switching transistor Q1. The base of the second switch Q2 is connected to the second end of the fourth resistor R4, the emitter of the second switch Q2 is connected to the first power supply terminal B1 through the sixth resistor R6, and the emitter of the second switch Q2 is connected to the upper base of the first switch Q1.

[0032] The fifth resistor R5 has its first end connected to the second end of the fourth resistor R4 and the upper collector of the first switching transistor Q1, and its second end connected to the emitter of the second switching transistor Q2. The first diode D1 has its anode connected to the collector of the second switching transistor Q2.

[0033] The working principle of the first switch unit 111 is as follows: Based on the front hatch opening command SG1 being active at a high level, the signal is sent to the lower base of the first switch transistor Q1 via the third resistor R3. After the first switch transistor Q1 receives the high level, it turns on, and then the second switch transistor Q2 turns on. The voltage of the first power supply terminal B1 is output through the sixth resistor R6 and the first diode D1, forming a power supply enable signal SG2 at the output terminal of the enable control unit 11.

[0034] In some embodiments, the enable control unit 11 further includes a first transient suppression diode T1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4. The first terminal of the first transient suppression diode T1 is connected to the cathode of the first diode D1, and the second terminal of the first transient suppression diode T1 is connected to a reference ground. The first transient suppression diode T1 is used to clamp the output signal to prevent surges. The third capacitor C3 and the fourth capacitor C4 are connected in parallel with the first transient suppression diode T1 for filtering. The first terminal of the second capacitor C2 is connected to the first power supply terminal B1, and the second terminal of the second capacitor C2 is connected to a reference ground, for filtering the voltage at the first power supply terminal B1.

[0035] In some embodiments, the enable control unit 11 further includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a fifth capacitor C5. The first terminal of the seventh resistor R7 is connected to the cathode of the first diode D1; the first terminal of the eighth resistor R8 is connected to the second terminal of the seventh resistor R7, and the second terminal of the eighth resistor R8 is connected to reference ground; the second terminal of the ninth resistor R9 is connected to the first controller 13. The first terminal of the fifth capacitor C5 is connected to the second terminal of the ninth resistor R9, and the second terminal of the fifth capacitor C5 is connected to reference ground. The seventh resistor R7, the eighth resistor R8, the ninth resistor R9, and the fifth capacitor C5 together form a sampling structure used to sample the output signal of the enable control unit 11 and output the sampling result to the first controller 13.

[0036] In some embodiments, the enable control unit 11 further includes a first disable unit 112. The input terminal of the first disable unit 112 is connected to the disable control pin of the first controller 13, and the output terminal of the first disable unit 112 is connected to the input terminal of the first switch unit 111. The first disable unit 112 is used to pull down the input voltage of the first switch unit 111 according to the first disable control signal SG3 output by the first controller 13, so as to turn off the first switch unit 111.

[0037] In some embodiments, the first disability portion 112 includes: The tenth resistor R10 has its first end serving as the input terminal of the first disabling unit 112, used to receive the first disabling control signal SG3.

[0038] The sixth capacitor C6 has its first terminal connected to the second terminal of the tenth resistor R10, and its second terminal connected to the reference ground.

[0039] The positive terminal of the second diode D2 is connected to the second end of the tenth resistor R10; The eleventh resistor R11 has its first terminal connected to the negative terminal of the second diode D2, and its second terminal connected to the reference ground.

[0040] The seventh capacitor C7 is connected to the eleventh resistor R11.

[0041] The base of the third switch Q3 is connected to the negative terminal of the second diode D2, the emitter of the third switch Q3 is connected to the reference ground, and the collector of the third switch Q3 is connected to the first terminal of the third resistor R3.

[0042] The working principle of the first disabling unit 112 is as follows: The first controller 13 detects an abnormality based on its internal state and outputs a first disabling control signal SG3. After current limiting by the tenth resistor R10, the signal is sent to the positive terminal of the second diode D2. The second diode D2 conducts in the forward direction, driving the third switch Q3 to conduct, thereby lowering the input voltage of the first switching unit 111 and turning off the first switching unit 111.

[0043] In some embodiments, the second control module 2 has a second controller 23, which is connected to the power supply control unit 21 and is used to output an internal enable signal SG4; such as Figure 3 , Figure 4 As shown, the power supply control unit 21 includes: The second switch unit 211 is connected to the output terminal of the power supply enable signal SG2 of the first control module 1. The second switch unit 211 is used to output a switch enable signal according to the power supply enable signal SG2.

[0044] AND gate U1, the first input terminal of AND gate U1 is connected to the switch enable signal output terminal of the second switch section 211, and the second input terminal of AND gate U1 is connected to the internal enable signal output terminal of the second controller 23.

[0045] The third switch 212 is connected between the second power supply terminal B2 and the output terminal of the power supply control unit 21. The control terminal of the third switch 212 is connected to the AND gate U1. The third switch 212 is used to be turned on when the logic signal is valid, so that the power supply control unit 21 outputs the power supply voltage V1. Specifically, when AND gate U1 receives both the switch enable signal and the internal enable signal SG4, it outputs a valid AND logic signal.

[0046] In some embodiments, the second switching part 211 includes: The base of the fourth switch Q4 is connected to the power enable signal SG2 output terminal of the first control module 1 through the twelfth resistor R12 and the thirteenth resistor R13 connected in series; the emitter of the fourth switch Q4 is connected to the reference ground; and the collector of the fourth switch Q4 is connected to the input voltage terminal through the seventeenth resistor R17.

[0047] The eighth capacitor C8, the ninth capacitor C9, the tenth capacitor C10, the eleventh capacitor C11, and the second transient suppression diode T2 are connected in series between the power enable signal SG2 output terminal and the reference ground. The tenth capacitor C10 is connected in series between the power enable signal SG2 output terminal and the reference ground. The second transient suppression diode T2 is connected between the power enable signal SG2 output terminal and the reference ground. The eighth capacitor C8, the ninth capacitor C9, the tenth capacitor C10, and the eleventh capacitor C11 form a filter network to filter the power enable signal SG2, and the second transient suppression diode T2 is used for clamping protection.

[0048] The twelfth capacitor C12 has its first terminal connected to the connection node of the twelfth resistor R12 and the thirteenth resistor R13, and its second terminal connected to the reference ground.

[0049] The thirteenth capacitor C13 has its first terminal connected to the base of the fifth switch Q5, and its second terminal connected to the reference ground.

[0050] The fourteenth resistor R14 has its first end connected to the base of the fourth switch Q4, and its second end connected to the emitter of the fourth switch Q4.

[0051] The base of the fifth switch Q5 is connected to the collector of the fourth switch Q4 through the fifteenth resistor R15. The emitter of the fifth switch Q5 is connected to the reference ground. The collector of the fifth switch Q5 is connected to the input voltage terminal through the eighteenth resistor R18.

[0052] The sixteenth resistor R16 has its first end connected to the base of the fifth switch Q5, and its second end connected to the reference ground.

[0053] The fourteenth capacitor C14 has its first terminal connected to the input voltage terminal and its second terminal connected to the reference ground.

[0054] The fifteenth capacitor C15 has its first terminal connected to the first input terminal of AND gate U1, and its second terminal connected to reference ground.

[0055] The nineteenth resistor R19 has its first terminal connected to the first input terminal of AND gate U1, and the second terminal of the fifteenth capacitor C15 is connected to the reference ground.

[0056] The working principle of the second switch unit 211 is as follows: The second switch unit 211 receives the power supply enable signal SG2 output by the first control module 1. After passing through the filter protection network formed by the eighth capacitor C8, the ninth capacitor C9, the tenth capacitor C10, the eleventh capacitor C11 and the second transient suppression diode T2, the power supply enable signal SG2 is transmitted to the base of the fourth switch transistor Q4 through the twelfth resistor R12 and the thirteenth resistor R13. The fourth switch transistor Q4 is turned on, which in turn turns on the fifth switch transistor Q5, and outputs a high-level switch enable signal to the first input terminal of the AND gate U1.

[0057] In some embodiments, the second input terminal of AND gate U1 is connected to the second controller 23 through the twentieth resistor R20 and the eleventh resistor R21 in series, for receiving the internal enable signal SG4. When AND gate U1 receives the high-level switch enable signal and the internal enable signal SG4, it outputs a valid AND logic signal.

[0058] This application implements dual-detection safety control through AND gate U1. Subsequent power output can only be triggered when the power enable signal SG2 of the first control module 1 and the internal enable signal SG4 of the second controller 23 are simultaneously valid. This solves the problem of malfunctions caused by a single controller failure and improves the safety of the hood drive circuit.

[0059] In some embodiments, the second control module 2 further includes a sixteenth capacitor C16, a seventeenth capacitor C17, a twenty-second resistor R22, a twenty-third resistor R23, and a twenty-fourth resistor R24. The first terminal of the sixteenth capacitor C16 is connected to the second input terminal of the AND gate U1, and the second terminal of the sixteenth capacitor C16 is connected to reference ground. The first terminal of the seventeenth capacitor C17 is connected to the input voltage terminal, and the second terminal of the seventeenth capacitor C17 is connected to reference ground. The first terminal of the twenty-second resistor R22 is connected to the second input terminal of the AND gate U1, and the second terminal of the twenty-second resistor R22 is connected to reference ground. The first terminal of the twenty-third resistor R23 is connected to the output terminal of the AND gate U1, and the second terminal of the twenty-third resistor R23 is connected to the collector of the fifth switching transistor Q5. The second terminal of the twenty-fourth resistor R24 ​​is connected to the output terminal of the AND gate U1. The third switching unit 212 includes: The base of the sixth switch Q6 is connected to the output of AND gate U1 through the twenty-fourth resistor R24, and the emitter of the sixth switch Q6 is connected to the reference ground.

[0060] The eighteenth capacitor C18 has its first terminal connected to the base of the sixth switch Q6, and its second terminal connected to the reference ground.

[0061] The 25th resistor R25 has its first end connected to the base of the 6th switch Q6, and the 18th capacitor C18 has its second end connected to the reference ground.

[0062] The seventh switch Q7 is a metal-oxide-semiconductor field-effect transistor (MOS). The source of the seventh switch Q7 is connected to the second power supply terminal B2, and the gate of the seventh switch Q7 is connected to the collector of the sixth switch Q6 through the twenty-sixth resistor R26. The drain of the seventh switch Q7 is used to output the supply voltage V1.

[0063] The nineteenth capacitor C19, the twenty-seventh resistor R27, and the third diode D3 are connected in parallel between the gate of the seventh switch Q7 and the second power supply terminal B2, respectively. This is used to stabilize the gate voltage of the seventh switch Q7, absorb voltage spikes, and prevent electrostatic damage.

[0064] The working principle of the third switching section is as follows: based on the valid AND logic signal output by AND gate U1, the sixth switch Q6 is turned on, and then the seventh switch Q7 is turned on. The output voltage of the second power supply terminal B2 is output through the drain of the seventh switch Q7 to form the power supply voltage V1.

[0065] In some embodiments, the second control module 2 further includes a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirtieth resistor R30, and a twentieth capacitor C20. The twenty-eighth resistor R28 and the twenty-ninth resistor R29 are connected in series between the drain of the seventh switch Q7 and the reference ground. The first terminal of the thirtieth resistor R30 is connected to the connection node of the twenty-eighth resistor R28 and the twenty-ninth resistor R29. The first terminal of the thirtieth capacitor C20 is connected to the second terminal of the thirtieth resistor R30, and the second terminal of the thirtieth capacitor C20 is connected to the reference ground. The sampling structure formed by the twenty-eighth resistor R28, the twenty-ninth resistor R29, the thirtieth resistor R30, and the twentieth capacitor C20 is used to sample the supply voltage V1 and output a sampling signal at the second terminal of the thirtieth resistor R30.

[0066] In some embodiments, the second control module 2 further includes a second disabling unit 213. The input terminal of the second disabling unit 213 is connected to the disabling control pin of the second controller 23, and the output terminal of the second disabling unit 213 is connected to the second input terminal of the AND gate U1. The second disabling unit 213 is used to pull down the voltage of the second input terminal of the AND gate U1 according to the second disabling control signal SG5 output by the second controller 23, so as to disable the AND logic signal.

[0067] In some embodiments, the second disability portion 213 includes: The thirty-second resistor R32 has its first end connected to the second controller 23 and is used to receive the second disability control signal SG5.

[0068] The positive terminal of the fourth diode D4 is connected to the second terminal of the thirty-second resistor R32.

[0069] The base of the eighth switch Q8 is connected to the negative terminal of the fourth diode D4, the emitter of the eighth switch Q8 is connected to the reference ground, and the collector of the eighth switch Q8 is connected to the connection node of the twentieth resistor R20 and the twentieth resistor R21.

[0070] The 23rd capacitor C23 has its first terminal connected to the positive terminal of the fourth diode D4, and its second terminal connected to the reference ground.

[0071] The thirty-third resistor R33 and the twenty-fourth capacitor C24 are connected between the base of the eighth switch Q8 and the reference ground, respectively.

[0072] The working principle of the second disabling unit 213 is as follows: The first controller 13 detects an abnormality based on its internal state and outputs a second disabling control signal SG5. After current limiting by the 32nd resistor R32, the signal is sent to the positive terminal of the fourth diode D4. The second diode D2 is forward-biased, driving the eighth switch Q8 to conduct, thereby pulling down the voltage at the second input terminal of AND gate U1, causing the AND logic signal output of AND gate U1 to fail.

[0073] In some embodiments, both the first controller 13 and the second controller 23 have a first safety level, and the drive signal V4 for driving the hood lock load 3 has a second safety level, wherein the second safety level is higher than the first safety level.

[0074] To achieve the functional safety objective of Automotive Safety Integrity Level D (ASIL-D) to prevent the front trunk from opening unintentionally while the vehicle is in motion, the selection process must be strictly followed. Control chips and other components must have lockstep cores, resulting in high overall costs and requiring a complete redesign from scratch. However, this application can achieve the ASIL-D functional safety objective by combining the existing first controller 13 and second controller 23 of Automotive Safety Integrity Level B (ASIL-B) with the power supply and drive separation circuit control logic of this application.

[0075] In some embodiments, the first control module 1 further includes a sampling unit 12, which is connected to the power supply control unit 21 and is used to sample the power supply voltage V1 and output a sampling signal V3.

[0076] The power supply voltage V1 sampled by the sampling unit 12 is the pull-up voltage signal V2 after being pulled up by the second control module 2. The second control module 2 also includes a 31st resistor R31, a 21st capacitor C21, a 22nd capacitor C22, and a 3rd transient suppression diode T3. The sampling unit 12 receives the power supply voltage V1 through the 31st resistor R31. The 21st capacitor C21, the 22nd capacitor C22, and the 3rd transient suppression diode T3 are respectively connected between the input terminal of the sampling unit 12 and the reference ground for filtering and voltage protection.

[0077] In some embodiments, such as Figure 5 As shown, the mining unit 12 includes: The thirty-fourth resistor R34 has its first terminal connected to the input terminal of the sampling circuit. The thirty-fifth resistor R35 has its first end connected to the first end of the thirty-fourth resistor R34, and its second end connected to the second end of the thirty-fourth resistor R34.

[0078] The positive terminal of the fifth diode D5 is connected to the input voltage terminal, and the negative terminal of the fifth diode D5 is connected to the second terminal of the thirty-fifth resistor R35.

[0079] The fourth transient suppression diode T4 has its first terminal connected to the second terminal of the thirty-fourth resistor R34, and its second terminal connected to the reference ground.

[0080] The 25th capacitor C25 has its first terminal connected to the first terminal of the 35th resistor R35, and its second terminal connected to the reference ground.

[0081] The thirty-sixth resistor R36 has its first end connected to the input terminal of the sampling circuit to receive the pull-up voltage signal V2, and its second end used to output the sampling signal V3.

[0082] The thirty-seventh resistor R37 has its first terminal connected to the second terminal of the thirty-sixth resistor R36, and the second terminal of the thirty-seventh resistor R37 is connected to the reference ground.

[0083] The 26th capacitor C26 has its first terminal connected to the second terminal of the 36th resistor R36, and its second terminal connected to the reference ground.

[0084] The working principle of the recovery unit 12 is as follows: the pull-up voltage signal V2 from the second control module 2 is current-limited by the thirty-sixth resistor R36 and voltage-divided by the thirty-seventh resistor R37 to generate the recovery signal V3, and the recovery signal V3 is fed back to the first controller 13.

[0085] In some embodiments, such as Figure 6 As shown, the drive unit 22 includes a drive chip U2. The logic pins of the drive chip U2 are connected to an external control chip, and the power pins of the drive chip U2 are connected to the power supply control unit 21. The output pins of the drive chip U2 are connected to the front hood lock load 3. The drive chip U2 is used to output a drive signal V4 according to the control signal output by the control chip and the power supply voltage V1 output by the power supply control unit 21.

[0086] In some embodiments, the control chip pins include current feedback pins and diagnostic pins, current feedback pins and diagnostic pin enable pins, diagnostic signal selection pins, etc. The drive unit 22 is also connected to the control chip's pre-diagnostic pins for receiving the pre-diagnostic signal SG6. The drive unit 22 includes: The power supply pin of the driver chip U2 is connected to the power supply control unit 21 to receive the power supply voltage V1.

[0087] The twenty-seventh capacitor C27, the twenty-eighth capacitor C28, and the twenty-ninth capacitor C29 are connected between the power supply pin of the driver chip U2 and the reference ground, respectively.

[0088] The eighth switch Q8 is a dual-channel switch. The lower base of the eighth switch Q8 is connected to the pre-diagnostic pin of the control chip through the thirty-ninth resistor R39 to receive the pre-diagnostic signal SG6. The upper emitter of the eighth switch Q8 is connected to the first power supply terminal B1.

[0089] The thirty-eighth resistor R38 has its first terminal connected to the first terminal of the thirty-ninth resistor R39, and its second terminal connected to the reference ground.

[0090] The sixth diode D6 has its anode connected to the upper collector of the eighth switch Q8, and its cathode connected to the first output terminal of the driver chip U2 through the forty-first resistor R41.

[0091] The positive terminal of the seventh diode D7 is connected to the upper collector of the eighth switch Q8, and the negative terminal of the seventh diode D7 is connected to the second output terminal of the driver chip U2 through the fortieth resistor R40.

[0092] The fifth transient suppression diode T5 is connected between the second output terminal of the driver chip U2 and the reference ground to clamp transient overvoltage.

[0093] The sixth transient suppression diode T6 is connected between the first output terminal of the driver chip U2 and the reference ground to clamp transient overvoltage.

[0094] The seventh transient suppression diode T7 is connected between the first output terminal and the second output terminal of the driver chip U2 and is used to clamp transient overvoltage.

[0095] The thirtieth capacitor C30 is connected between the first output terminal of the driver chip U2 and the reference ground, and is used to filter the drive signal V4. The thirty-first capacitor C31 is connected between the second output terminal of the driver chip U2 and the reference ground, and is used to filter the drive signal V4.

[0096] The driving unit 22 operates as follows: The control chip performs a pre-diagnosis. If the pre-diagnosis is successful, a high-level pre-diagnosis signal SG6 is output from the pre-diagnosis pin. Based on the high-level pre-diagnosis signal SG6, the eighth switch Q8 is turned on. The voltage at the first power supply terminal B1 is output through the upper drain of the eighth switch Q8, and provides pre-power to the output terminal of the driving chip U2 through the sixth diode D6 and the seventh diode D7, respectively. Simultaneously, the power supply voltage V1 provides power to the driving chip U2. After receiving the control signal from the control chip, the driving chip U2 controls the internal power transistor to operate, outputting a driving signal V4 to drive the front hatch lock load 3 to perform its action.

[0097] In some embodiments, a first control module 1 is disposed in a first region of the vehicle, and a second control module 2 is disposed in a second region of the vehicle, wherein the first region and the second region are separated from each other.

[0098] like Figure 7 As shown, in some embodiments, this application can be applied to the Zonal Architecture of a vehicle. The Zonal Architecture groups vehicle functions according to location regions, for example, it is divided into left region 41, right region 42 and rear region 43 according to location regions. In this embodiment, the first region is left region 41 and the second region is right region 42.

[0099] Embodiments of this application also provide a vehicle that includes the hood drive circuit described in the above embodiments.

[0100] The foregoing has provided a detailed description of a hood drive circuit and vehicle provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A front hood drive circuit, characterized in that, include: The first control module is used to output a power enable signal according to the front hood opening command; The second control module is connected to the first control module, and the second control module includes a power supply control unit and a drive unit. The power supply control unit is used to output a power supply voltage when it receives the power supply enable signal and the internal enable signal; wherein the internal enable signal is generated by the second control module according to the internal state; the drive unit is used to output a drive signal according to the power supply voltage to drive the front hatch lock load to perform an action.

2. The front hood drive circuit according to claim 1, characterized in that, The first control module includes: The first controller is used to output the hood opening command; An enable control unit is connected to the first controller. The enable control unit has a first switch section connected between a first power supply terminal and the output terminal of the enable control unit. When the hood opening command is valid, the first switch section is turned on so that the enable control unit outputs the power supply enable signal.

3. The front hood drive circuit according to claim 2, characterized in that, The enabling control unit further includes a first disabling unit. The input terminal of the first disabling unit is connected to the disabling control pin of the first controller, and the output terminal of the first disabling unit is connected to the input terminal of the first switch unit. The first disabling unit is used to pull down the input terminal voltage of the first switch unit according to the first disabling control signal output by the first controller, so as to turn off the first switch unit.

4. The front hood drive circuit according to claim 2, characterized in that, The second control module has a second controller, which is connected to the power supply control unit and is used to output the internal enable signal; The power supply control unit includes: The second switch is connected to the power enable signal output terminal of the first control module. The second switch is used to output a switch enable signal according to the power enable signal. The AND gate has its first input connected to the switch enable signal output of the second switch unit, and its second input connected to the internal enable signal output of the second controller. A third switch section is connected between the second power supply terminal and the output terminal of the power supply control unit. The control terminal of the third switch section is connected to the AND gate. The third switch section is used to conduct when the logic signal is valid, so that the power supply control unit outputs the power supply voltage. Specifically, when the AND gate receives the switch enable signal and the internal enable signal, it outputs a valid AND logic signal.

5. The hood drive circuit according to claim 4, characterized in that, Both the first controller and the second controller have a first safety level, and the drive signal used to drive the load of the front hood lock has a second safety level, wherein the second safety level is higher than the first safety level.

6. The hood drive circuit according to claim 4, characterized in that, The second control module further includes a second disabling unit. The input terminal of the second disabling unit is connected to the disabling control pin of the second controller, and the output terminal of the second disabling unit is connected to the second input terminal of the AND gate. The second disabling unit is used to pull down the voltage of the second input terminal of the AND gate according to the second disabling control signal output by the second controller, so as to disable the AND logic signal.

7. The front hood drive circuit according to claim 1, characterized in that, The drive unit includes a drive chip, whose logic pins are connected to an external control chip, and whose power pins are connected to the power supply control unit; the output pins of the drive chip are connected to the front hood lock load, and the drive chip is used to output the drive signal according to the control signal output by the control chip and the power supply voltage output by the power supply control unit.

8. The front hood drive circuit according to claim 1, characterized in that, The first control module further includes a sampling unit, which is connected to the power supply control unit and is used to sample the power supply voltage and output a sampling signal.

9. The front hood drive circuit according to claim 1, characterized in that, The first control module is located in a first area of ​​the vehicle, and the second control module is located in a second area of ​​the vehicle. The first area and the second control module are separate from each other.

10. A vehicle, characterized in that, The vehicle includes a hood drive circuit as described in any one of claims 1 to 9.

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