CN117108160A - Back door detection system and method and automobile - Google Patents

Abstract

The invention provides a back door detection system, a back door detection method and an automobile, wherein the back door detection system comprises the following components: hall sensor and back door controller with low power consumption timer; the output end of the low-power consumption timer is connected with the power end of the Hall sensor, the input end of the back door controller is connected with the output end of the Hall sensor, and the output end of the back door controller is connected with the motor on the back door; when the back door controller is in a preset operation mode, a low-power consumption timer in the back door controller outputs power supply current to the Hall sensor; and the Hall sensor is started when receiving the power supply current, and detects back door state information. According to the invention, the back door controller provided with the low-power-consumption timer is adopted, and the low-power-consumption timer is utilized to provide the required power supply current for the Hall sensor, so that the Hall sensor starts to detect the back door state information, and the back door is powered under the condition that a special power management chip for the back door is not required, thereby effectively reducing the cost of the back door detection system.

Description

Back door detection system and method and automobile

Technical Field

The invention relates to the technical field of vehicles, in particular to a back door detection system and method and an automobile.

Background

The electric back door control system of the automobile generally adopts a Hall sensor to detect the position of a back door stay bar; under the scene that the vehicle is flameout and the back door is closed, the back door controller is in a door closing stop mode, and the detection of a stay bar Hall signal is not needed. In a scene that the vehicle is flameout but the back door is opened for a long time, the back door controller is in a door-opening sleep mode; in order to prevent the position signal error caused by misoperation of the back door of the customer, the Hall sensor still needs to be powered, and the back door controller is awakened once the Hall signal is detected; the power supply to the Hall sensor is continuously performed in the mode, so that the Hall sensor has high power consumption.

In order to avoid how much power consumption of the hall sensor is, a special power management chip for back door such as TLE9461 can be adopted, the power management chip has periodic power output, and can periodically supply power to the hall sensor and detect the hall wake-up signal in the period so as to reduce the average power consumption of the hall sensor; however, the price of the special power management chip for the back door adopted by the scheme is very high, and the cost of the back door detection system comprising the Hall sensor is required to be reduced under the scene that the Hall sensor is normally powered.

The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.

Disclosure of Invention

The invention mainly aims to provide a back door detection system and method and an automobile, and aims to solve the technical problem that in the prior art, under the condition that a Hall sensor is powered normally, the back door detection system is high in cost.

In order to achieve the above object, the present invention provides a back door detection system, including: hall sensor and back door controller with low power consumption timer;

the output end of the low-power consumption timer is connected with the power end of the Hall sensor, the input end of the back door controller is connected with the output end of the Hall sensor, and the output end of the back door controller is connected with the motor;

the low-power-consumption timer in the back door controller is used for outputting power supply current to the Hall sensor when the back door controller is in a preset operation mode;

the Hall sensor is used for starting when receiving the power supply current and detecting back door state information.

Optionally, the low power consumption timer is further configured to generate and output a PWM supply current to the hall sensor when the back door controller is in the door-open sleep mode;

the Hall sensor is further used for detecting back door state information when the PWM power supply current is received, outputting a state switching signal to the back door controller when the back door state changes, and enabling the back door controller to enter a normal working mode.

Optionally, the low-power consumption timer is further configured to adjust a duty ratio and a period of the PWM supply current according to the stay bar operation information of the vehicle owner when the back door controller is in the door-open sleep mode, and output the adjusted PWM supply current to the hall sensor;

the Hall sensor is used for detecting back door state information when receiving the regulated PWM power supply current.

Optionally, the back door detection system further comprises: a drive enhancing circuit;

the input end of the drive enhancing circuit is connected with the output end of the low-power consumption timer, and the output end of the drive enhancing circuit is connected with the power end of the Hall sensor;

the drive enhancing circuit is used for amplifying the received power supply current output by the low-power-consumption timer and outputting the amplified power supply current to the Hall sensor;

the Hall sensor is used for starting when receiving the amplified power supply current and detecting back door state information.

Optionally, the drive enhancing circuit includes: the first resistor, the second resistor, the first capacitor, the second capacitor, the first diode and the first triode;

the anode of the first diode is connected with the first end of the first capacitor and the output end of the low-power consumption timer respectively, the cathode of the first diode is connected with the first end of the first resistor, and the second end of the first resistor is connected with the first end of the second capacitor and the base electrode of the first triode respectively;

the collector of the first triode is connected with the second end of the second resistor, and the emitter of the first triode is respectively connected with the first end of the third resistor and the first end of the fourth resistor;

the first end of the second resistor is connected with a power supply, and the power end of the Hall sensor is connected with the second end of the third resistor;

the second end of the first capacitor, the second end of the second capacitor and the second end of the fourth resistor are grounded.

Optionally, the back door detection system further comprises: a power conversion module;

the input end of the power supply conversion module is connected with a power supply, and the output end of the power supply conversion module is connected with the power supply end of the back door controller;

the power supply conversion module is used for converting the power supply voltage output by the power supply into the working voltage required by the back door controller and outputting the working voltage to the back door controller.

The low-power-consumption timer is further used for generating and outputting a high-level power supply current to the Hall sensor when the back door controller is in a normal working mode;

the Hall sensor is also used for continuously detecting the back door state information under the condition of receiving the high-level power supply current.

In order to achieve the above object, the present invention further provides a back door detection method, where the back door detection method is applied to a low power consumption timer in the back door detection system;

the back door detection method comprises the following steps:

when the backdoor controller is in a preset operation mode, outputting a power supply current to the Hall sensor; the power supply current is used for starting the Hall sensor to detect a back door adjusting signal, outputting the back door adjusting signal to the back door controller when detecting the back door adjusting signal, and controlling the back door controller to adjust the back door.

Optionally, when the backdoor controller is in the preset operation mode, outputting a supply current to the hall sensor, including:

generating PWM power supply current when the back door controller is in a door opening sleep mode;

acquiring the stay bar operation information of a vehicle owner;

generating and adjusting the duty ratio and period of the PWM power supply current according to the stay bar operation information of the vehicle owner, and outputting the adjusted PWM power supply current to the Hall sensor; the PWM power supply current is used for controlling the Hall sensor to detect back door state information.

In order to achieve the above object, the present invention also proposes an automobile comprising: the back door detection system is used for detecting the back door.

The invention provides a back door detection system, a back door detection method and an automobile, wherein the back door detection system comprises the following components: hall sensor and back door controller with low power consumption timer; the output end of the low-power consumption timer is connected with the power end of the Hall sensor, the input end of the back door controller is connected with the output end of the Hall sensor, and the output end of the back door controller is connected with the motor on the back door; the low-power-consumption timer in the back door controller is used for outputting power supply current to the Hall sensor when the back door controller is in a preset operation mode; the Hall sensor is used for starting when receiving the power supply current and detecting back door state information. In the invention, the back door controller provided with the low-power-consumption timer is adopted, and the low-power-consumption timer is utilized to provide the required power supply current for the Hall sensor, so that the Hall sensor starts to detect the back door state information, and the back door is powered under the condition that a special power management chip for the back door is not required, thereby effectively reducing the cost of the back door detection system.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a first embodiment of a back door detection system according to the present invention;

FIG. 2 is a schematic diagram of a prior art back door detection system;

FIG. 3 is a hardware block diagram of a prior art back door detection system;

FIG. 4 is a schematic diagram of a back door detection system according to a third embodiment of the present invention;

fig. 5 is a hardware block diagram of a back door detection system according to a third embodiment of the present invention;

FIG. 6 is a schematic circuit diagram of a driving enhancement circuit in a back gate detection system according to an embodiment of the present invention;

fig. 7 is a schematic flow chart of an embodiment of a back door detection method according to the present invention.

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of a back door detection system according to the present invention. Based on fig. 1, a first embodiment of the back door detection system of the present invention is presented.

In a first embodiment, the back door detection system includes: hall sensor 10 and back door controller 20 provided with low power consumption timer 201;

the output end of the low power consumption timer 201 is connected with the power end of the hall sensor 10, the input end of the back door controller 20 is connected with the output end of the hall sensor 10, and the output end of the back door controller 20 is connected with a motor.

It will be appreciated that the back door of the vehicle may still be opened or closed in the off condition, and that in order to avoid position signal errors caused by undetectable changes in the state of the back door, it is necessary to power the hall sensor 10 for detecting the state of the back door in real time. Referring to fig. 2 and 3, in order to avoid excessive power consumption of the hall sensor 10, a dedicated power management chip may be used to supply power to the hall sensor 10 at a certain period. The dedicated power management chip is very expensive.

In order to solve the above-described problem, the back door controller 20 provided with the low power consumption timer 201 is selected to be used. The hall sensor 10 is supplied with the required supply current by the low power timer 201. The low power timer 201 can continuously supply power to the hall sensor 10 when the vehicle is in a starting state; while the vehicle is in a flameout state, the low power consumption timer 201 may also supply power to the hall sensor 10 for a certain period. When the hall sensor 10 receives the supply current, the back door state information can be detected.

The hall sensor 10 may determine the back door state information by detecting the back door stay. The back door controller 20 is a device for controlling the state of the back door. The back door controller 20 may drive a motor provided on the back door according to a control signal input from a back door switch control key in the vehicle, thereby controlling the state of the back door. The operating modes of the back door controller 20 include a normal operating mode, a door open sleep mode, and a door closed shut down mode. The low power consumption timer 201 has low power consumption, and the hall sensor 10 can be powered at certain intervals by using the function of the timer. The motors on the back door connected to the back door controller 20 include a stay motor, a back door lock motor, etc., wherein the number of stay motors may be plural.

In a specific implementation, it is necessary to determine an operation mode of the back door controller, and the low power consumption timer 201 in the back door controller 20 may output a supply current to the hall sensor 10 when the back door controller is in a preset operation mode; the hall sensor 10 may start operation when receiving the power supply current, thereby detecting back door state information. The hall sensor 10 can be started according to the supply current output to the low power consumption timer 201 during the detection process. The preset operation mode comprises a normal operation mode and a door opening sleep mode, and the hall sensors are required to detect the working state of the back door in the preset operation mode. In the case where the low power timer 201 continuously outputs the supply current, the hall sensor 10 can continuously detect the back door state information; when the low power timer 201 outputs the supply current at regular intervals, the hall sensor 10 also detects the back door state information at intervals of the supply current.

In this embodiment, there is provided a back door detection system including: hall sensor 10 and back door controller 20 provided with low power consumption timer 201; the output end of the low-power consumption timer 201 is connected with the power end of the Hall sensor 10, the input end of the back door controller 20 is connected with the output end of the Hall sensor 10, and the output end of the back door controller 20 is connected with a motor on a back door; the low power consumption timer 201 in the back door controller 20 outputs a supply current to the hall sensor 10 when the back door controller is in a preset operation mode; the hall sensor 10 is started when receiving the power supply current, and detects back door state information. In the invention, the back door controller provided with the low-power-consumption timer is adopted, and the low-power-consumption timer is utilized to provide the required power supply current for the Hall sensor, so that the Hall sensor starts to detect the back door state information, and the back door is powered under the condition that a special power management chip for the back door is not required, thereby effectively reducing the cost of the back door detection system.

A second embodiment of the back door detection system of the present invention is proposed based on the first embodiment described above.

In the second embodiment, it is considered that the low power consumption timer 201 can output different supply currents to the hall sensor 10. In order to determine the specific manner in which the low power timer 201 outputs the supply current, the back door controller 20 also needs to determine the vehicle state, i.e., determine its own operation mode. The back door controller 20 may determine its own operation mode based on an ignition signal, a back door switching signal, a hall sensor position variation signal, etc. For example, the vehicle is in a flameout state and the back door is in an open state, the back door controller 20 is in a door-open sleep mode.

The modes of operation of the back door controller 20 include: normal operation mode, door open sleep mode, door close shut down mode, etc. The normal operation mode corresponds to the vehicle being in a normal operation state, and the hall sensor 10 needs to detect the back door state information in real time at this time, so the low-power consumption timer 201 needs to continuously supply power to the hall sensor 10; in the door-open sleep mode, normally, the driver closes the back door when leaving the vehicle, and the back door state information is detected, but the back door state information does not need to be detected in real time, so that the low-power consumption timer 201 can output the power supply current to the hall sensor 10 according to a certain period, and the hall sensor 10 is started only when receiving the power supply current, so that the back door state information is detected; in the door closing stop mode, the driver does not need to open or close the back door, and it is considered that the back door state information does not need to be detected, so that the low power consumption timer 201 does not need to supply power to the hall sensor 10, and the hall sensor 10 is in a power-off state.

In different operation modes, the back gate controller 20 controls the internal low power timer 201 to output different supply currents. The low power timer 201 may generate and output a PWM supply current to the hall sensor 10 when the operation mode is in the door-open sleep mode; when the hall sensor 10 receives the PWM supply current, it detects the status information of the back door according to the supply time interval in the PWM signal, and outputs a status switching signal to the back door controller 20 when the status of the back door changes, so as to control the back door controller 20 to switch to the normal working mode. At this time, the low power consumption timer 10 is in a PWM mode that outputs PWM supply current.

Of course, the low power timer 201 may generate and output a continuous high-level supply current to the hall sensor 10 when the operation mode of the back door controller 20 is in the normal operation mode, and the hall sensor 10 is further configured to continuously detect back door state information when receiving the high-level supply current. The low power consumption timer 10 is in a single continuous power supply mode in which a high level signal is continuously output.

In addition, to ensure that the hall sensor 10 effectively captures a hall signal, i.e., a change in the back door state, and wakes up the back door controller 20 during a time window in which the vehicle owner manually operates the stay bar while the back door controller 20 is in the door-open sleep mode. The low power consumption timer 201 may also adjust the duty ratio and period of the PWM supply current according to the stay bar operation information executed by the vehicle owner on the stay bar when the back door controller is in the door-open sleep mode, and output the adjusted PWM supply current to the hall sensor 10; the hall sensor 10 may detect back door status information upon receiving the adjusted PWM supply current.

Wherein the stay bar operation information includes: the action time of the main operation stay bar and the speed of the adjustment stay bar. Considering that too high a duty cycle or too short a period of the PWM supply current may cause an increase in power consumption of the hall sensor 10, while too low a duty cycle or too long a period of the PWM supply current may cause the hall sensor 10 to be unable to effectively detect the back door state information. In this embodiment, when the PWM supply current is adjusted according to the action time of the conventional vehicle owner and the speed of the adjusting stay bar, the duty ratio of the PWM supply current is in a 2ms high level state, and a 30ms low level state is optimal.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a back door detection system according to a third embodiment of the present invention. Based on the first embodiment or the second embodiment of the back door detection system described above, a third embodiment of the back door detection system of the present invention is presented.

In this embodiment, the back door detection system further includes: a drive enhancing circuit 30; an input end of the drive enhancing circuit 30 is connected with an output end of the low power consumption timer 201, and an output end of the drive enhancing circuit 30 is connected with a power end of the hall sensor 10.

It should be appreciated that, considering that the low power consumption timer 10 has a low output current value, it is not necessarily capable of meeting the power supply requirement of the hall sensor 10. In this embodiment, therefore, a drive enhancing circuit 30 is also provided, and the drive enhancing circuit 30 can amplify the magnitude of the supply current output from the low power consumption timer 10 so as to meet the power supply requirement of the hall sensor 10.

In a specific implementation, the drive enhancing circuit may receive the supply current output by the low power consumption timer, amplify the supply current, and output the amplified supply current to the hall sensor 10; the hall sensor 10 may be normally started when receiving the amplified power supply current, so as to detect back door state information.

Referring to fig. 5 and 6, in the present embodiment, the drive enhancing circuit includes: first to fourth resistors, first to second capacitors, first diode D1, and first transistor Q1;

the anode of the first diode D1 is connected to the first end of the first capacitor C1 and the output end of the low power consumption timer 201, the cathode of the first diode D1 is connected to the first end of the first resistor R1, and the second end of the first resistor R2 is connected to the first end of the second capacitor C2 and the base of the first triode Q;

the collector of the first triode Q1 is connected with the second end of the second resistor R2, and the emitter of the first triode Q1 is respectively connected with the first end of the third resistor R3 and the first end of the fourth resistor R4;

the first end of the second resistor R2 is connected with a power supply VCC, and the power end of the Hall sensor 10 is connected with the second end of the third resistor R3;

the second end of the first capacitor C1, the second end of the second capacitor C2, and the second end of the fourth resistor R4 are grounded to GND.

The driving enhancing circuit may further include a non-chip NC, where the non-chip NC is a debug resistor, and a first end of the non-chip NC is connected to a second end of the second resistor R2 and a collector of the first triode Q1, respectively. The non-patch NC is disconnected when the drive enhancing circuit 30 normally amplifies the supply current. The other resistors are voltage dividing resistors, the first capacitor C1 is a filter capacitor, and the second capacitor C2 is a voltage stabilizing capacitor.

Referring to fig. 4, the power supply current output by the low power consumption timer 201 is filtered by the first capacitor C1, then is input to the base of the first triode Q1 pair after being stabilized by the second capacitor C2, and is input to the power supply end of the hall sensor 10 after being amplified by the first triode Q1 through the third resistor R3. The supply current includes: high level supply current and PWM supply current. In the state of effective duty ratio of high-level power supply current and PWM power supply current, the first triode Q1 is conducted and amplifies the power supply current; in a non-effective duty ratio state in which the low power consumption timer 201 does not output the supply current or the PWM supply current, the first transistor Q1 is turned off.

The first diode D1 can avoid the backflow of the supply current when the supply current output by the low power consumption timer 201 fluctuates. The specific internal structure of the low power consumption timer 10 can be referred to in fig. 4, and will not be described herein.

Referring to fig. 2 and 3, it is considered that the back door controller 20 may be powered by a power chip alone in the prior art, the hall sensor 10 is powered by a dedicated power management chip, or the back door controller 20 and the hall sensor 10 are powered by a dedicated power management chip at the same time.

In the case where the back door controller 20 and the hall sensor 10 are simultaneously powered by a dedicated power management chip, the dedicated power management chip is omitted, and the back door controller 20 cannot normally operate.

In order to solve the above problem, the back door detection system further includes: a power conversion module 40;

the input end of the power conversion module 40 is connected to the power supply VCC, and the output end is connected to the power supply end of the back door controller 20.

It should be understood that, in the case where a dedicated power management chip is omitted, the power supply conversion module 40 may be provided to regulate the power supply voltage output from the power supply, so that the voltage input to the back gate controller 20 is a voltage at which the back gate controller 20 can normally operate. For example, the 12V voltage output from the power supply VCC may be converted into the 5V operating voltage of the back gate controller 20. The power conversion module 40 may be a DC-DC power supply of MPQ9970 GL.

In addition, in order to achieve the above purpose, the invention also provides a back door detection method, which is applied to a low-power-consumption timer in a back door detection system.

The back door detection method comprises the following steps:

when the backdoor controller is in a preset operation mode, outputting a power supply current to the Hall sensor; the power supply current is used for starting the Hall sensor to detect a back door adjusting signal, and outputting the back door adjusting signal to the back door controller when the back door adjusting signal is detected.

It will be appreciated that the back door of the vehicle may still be opened or closed in the flameout condition, and in order to avoid position signal errors caused by undetectable state changes of the back door, real-time power supply to the hall sensor for detecting the state of the back door is required. In order to avoid overlarge power consumption of the Hall sensor, a special power management chip can be utilized to supply power for the Hall sensor according to a certain period. The dedicated power management chip is very expensive.

In order to solve the above-mentioned problem, a back door controller provided with a low power consumption timer is selected to be used. The low power consumption timer provides the required power supply current for the Hall sensor. When the vehicle is in a starting state, the low-power-consumption timer can continuously supply power to the Hall sensor; and when the vehicle is in a flameout state, the low-power consumption timer can also supply power for the Hall sensor in a certain period. Under the condition that the Hall sensor receives the power supply current, the back door state information can be detected.

The hall sensor may determine the back door state information by detecting the back door stay. The back door controller is a device for controlling the state of the back door. The back door controller can drive the motor arranged on the back door according to a control signal input by a back door switch control key in the vehicle, so as to control the state of the back door. The low-power consumption timer has lower power consumption, and the function of the timer can be utilized to supply power to the Hall sensor at certain intervals. The motors connected with the back door controller on the back door comprise stay bar motors, back door lock motors and the like, wherein the number of the stay bar motors can be multiple.

In a specific implementation, when the back door controller is in a preset operation mode, a low-power-consumption timer in the back door controller can output a supply current to the hall sensor; the Hall sensor can start working when receiving the power supply current, so that back door state information is detected. In the detection process, the Hall sensor can be started according to the power supply current output by the low-power-consumption timer, and can continuously detect the back door state information under the condition that the low-power-consumption timer continuously outputs the power supply current; when the low-power-consumption timer outputs power supply current at certain intervals, the Hall sensor can also detect back door state information according to the time interval of the power supply current, and when the back door adjusting signal is detected, the back door adjusting signal is output to the back door controller.

In addition, considering that the output current value of the low-power-consumption timer is low, the power supply requirement of the hall sensor is not necessarily met. Therefore, in the embodiment, the amplitude of the power supply current can be amplified so as to meet the power supply requirement of the Hall sensor.

Further, referring to fig. 7, the back door detection method in this embodiment specifically includes:

step S10: generating PWM power supply current when the back door controller is in a door opening sleep mode;

step S20: acquiring the stay bar operation information of a vehicle owner;

step S30: and generating and adjusting the duty ratio and the period of the PWM power supply current according to the strut operation information of the vehicle owner, and outputting the adjusted PWM power supply current to the Hall sensor.

The PWM supply current is used to control the hall sensor to detect the status information of the back door, and output a status switching signal to the back door controller when the status of the back door changes, so as to control the back door controller to enter a normal working mode.

Of course, when the operation mode is in the normal operation mode, the low power consumption timer can generate and output a high-level power supply current to the hall sensor; the Hall sensor is also used for continuously detecting the back door state information under the condition of receiving the high-level power supply current.

Considering that the low power consumption timer can output different supply currents to the hall sensor, in order to determine the specific mode of the low power consumption timer outputting the supply currents, the back door controller also needs to determine the vehicle state, namely, determine the running mode of the back door controller. The back door controller can determine the running mode of the back door controller according to an ignition signal, a back door switch signal, a Hall sensor position change signal and the like. For example, when the vehicle is in a flameout state and the back door is in an open state, the back door controller is in a door-open sleep mode. The operation modes of the back door controller comprise: normal operation mode, door open sleep mode, door close shut down mode, etc. The normal working mode corresponds to the normal working state of the vehicle, and the Hall sensor needs to detect the back door state information in real time at the moment, so that the low-power-consumption timer needs to continuously supply power to the Hall sensor; in the door-opening sleep mode, normally, a driver closes the back door when leaving the vehicle, and the back door state information is detected, but the back door state information does not need to be detected in real time, so that the low-power-consumption timer can output power supply current to the Hall sensor according to a certain period, and the Hall sensor is started only under the condition of receiving the power supply current, so that the back door state information is detected; in the door closing sleep state, the driver does not need to open or close the back door, and the driver can determine that the back door state information does not need to be detected at the moment, so that the low-power consumption timer does not need to supply power to the Hall sensor, and the Hall sensor is in a power-off state.

Under different operation modes, the back door controller controls the internal low-power-consumption timer to output different power supply currents. When the operation mode is in the door-opening sleep mode, the low-power-consumption timer can generate and output PWM power supply current to the Hall sensor; and when the Hall sensor receives the PWM power supply current, detecting back door state information according to a power supply time interval in a PWM signal, and outputting a state switching signal to the back door controller when the back door state is changed, so as to control the back door controller to switch to a normal working mode. At this time, the low power timer is in a PWM mode for outputting PWM supply current.

Of course, when the operation mode of the back door controller is in the normal operation mode, the low-power consumption timer can generate and output continuous high-level power supply current to the hall sensor, and the hall sensor is further used for continuously detecting back door state information under the condition of receiving the high-level power supply current. The low power timer is in a single continuous power mode for continuously outputting a high level signal.

In addition, when the back door controller is in the door-opening sleep mode, in order to ensure that the Hall sensor can effectively capture a Hall signal, namely the change of the back door state, and wake up the back door controller in a time window of a manual operation supporting rod of a vehicle owner. The low-power consumption timer can also adjust the duty ratio and period of the PWM power supply current according to the stay bar operation information of a vehicle owner on the stay bar when the back door controller is in the door-opening sleep mode, and output the adjusted PWM power supply current to the Hall sensor; the Hall sensor can detect back door state information when receiving the regulated PWM power supply current.

Wherein the stay bar operation information includes: the action time of the main operation stay bar and the speed of the adjustment stay bar. Considering that too high a duty cycle or too short a period of the PWM supply current may cause an increase in power consumption of the hall sensor, while too low a duty cycle or too long a period of the PWM supply current may cause the hall sensor to be unable to effectively detect the back door state information. In this embodiment, when the PWM supply current is adjusted according to the action time of the conventional vehicle owner and the speed of the adjusting stay bar, the duty ratio of the PWM supply current is in a 2ms high level state, and a 30ms low level state is optimal.

The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims (10)

1. A back door detection system, the back door detection system comprising: hall sensor and back door controller with low power consumption timer;

the output end of the low-power consumption timer is connected with the power end of the Hall sensor, the input end of the back door controller is connected with the output end of the Hall sensor, and the output end of the back door controller is connected with the motor;

the low-power-consumption timer in the back door controller is used for outputting power supply current to the Hall sensor when the back door controller is in a preset operation mode;

the Hall sensor is used for starting when receiving the power supply current and detecting back door state information.

2. The backdoor detection system of claim 1, wherein the low power timer is further configured to generate and output a PWM supply current to the hall sensor when the backdoor controller is in a door-open sleep mode;

the Hall sensor is further used for detecting back door state information when the PWM power supply current is received, outputting a state switching signal to the back door controller when the back door state changes, and enabling the back door controller to enter a normal working mode.

3. The backdoor detection system of claim 2, wherein the low power consumption timer is further configured to adjust a duty cycle and a period of the PWM supply current according to stay bar operation information of a vehicle owner when the backdoor controller is in a door-open sleep mode, and output the adjusted PWM supply current to the hall sensor;

the Hall sensor is used for detecting back door state information when receiving the regulated PWM power supply current.

4. The backdoor detection system of claim 1, wherein the backdoor detection system further comprises: a drive enhancing circuit;

the input end of the drive enhancing circuit is connected with the output end of the low-power consumption timer, and the output end of the drive enhancing circuit is connected with the power end of the Hall sensor;

the drive enhancing circuit is used for amplifying the received power supply current output by the low-power-consumption timer and outputting the amplified power supply current to the Hall sensor;

the Hall sensor is used for starting when receiving the amplified power supply current and detecting back door state information.

5. The back door detection system of claim 4, wherein the drive enhancement circuit comprises: the first resistor, the second resistor, the first capacitor, the second capacitor, the first diode and the first triode;

the anode of the first diode is connected with the first end of the first capacitor and the output end of the low-power consumption timer respectively, the cathode of the first diode is connected with the first end of the first resistor, and the second end of the first resistor is connected with the first end of the second capacitor and the base electrode of the first triode respectively;

the collector of the first triode is connected with the second end of the second resistor, and the emitter of the first triode is respectively connected with the first end of the third resistor and the first end of the fourth resistor;

the first end of the second resistor is connected with a power supply, and the power end of the Hall sensor is connected with the second end of the third resistor;

the second end of the first capacitor, the second end of the second capacitor and the second end of the fourth resistor are grounded.

6. The backdoor detection system of claim 1, wherein the backdoor detection system further comprises: a power conversion module;

the input end of the power supply conversion module is connected with a power supply, and the output end of the power supply conversion module is connected with the power supply end of the back door controller;

the power supply conversion module is used for converting the power supply voltage output by the power supply into the working voltage required by the back door controller and outputting the working voltage to the back door controller.

7. The backdoor detection system of claim 1, wherein the low power timer is further configured to generate and output a high level supply current to the hall sensor when the backdoor controller is in a normal operating mode;

the Hall sensor is also used for continuously detecting the back door state information under the condition of receiving the high-level power supply current.

8. A back door detection method, characterized in that the back door detection method is applied to the back door detection system of any one of claims 1 to 7;

the back door detection method comprises the following steps:

when the backdoor controller is in a preset operation mode, outputting a power supply current to the Hall sensor; the power supply current is used for starting the Hall sensor to detect a back door adjusting signal, and outputting the back door adjusting signal to the back door controller when the back door adjusting signal is detected, and the back door controller adjusts the back door.

9. The backdoor detection method of claim 8, wherein outputting a supply current to the hall sensor when the backdoor controller is in a preset operation mode comprises:

generating PWM power supply current when the back door controller is in a door opening sleep mode;

acquiring the stay bar operation information of a vehicle owner;

generating and adjusting the duty ratio and period of the PWM power supply current according to the stay bar operation information of the vehicle owner, and outputting the adjusted PWM power supply current to the Hall sensor; the PWM power supply current is used for controlling the Hall sensor to detect back door state information.

10. An automobile, the automobile comprising: the back door detection system of any of claims 1-7.