CN110984735B

CN110984735B - Electric back door unlocking control method and electric back door lock

Info

Publication number: CN110984735B
Application number: CN201911115416.7A
Authority: CN
Inventors: 张小明; 李颖辉; 张俊磊
Original assignee: Dongfeng Motor Co Ltd
Current assignee: Dongfeng Motor Co Ltd
Priority date: 2019-11-14
Filing date: 2019-11-14
Publication date: 2022-01-21
Anticipated expiration: 2039-11-14
Also published as: CN110984735A

Abstract

The invention discloses an unlocking control method for an electric backdoor, which comprises the following steps: driving a door lock motor to enable an unlocking connecting rod to be in a release position; setting a first set time period, starting timing, and detecting a ratchet wheel half-lock position signal; before the first set time period is finished, when the jumping of the ratchet wheel half-lock position signal is detected, timing of the first set time period is ended, a second set time period is set and timing is started, after the second set time period is finished, the door lock motor is driven to reset, and the unlocking connecting rod is reset under the action of a reset spring; and after the first set time period is over, the ratchet wheel half-lock position signal does not jump to drive the door lock motor to reset, and the unlocking connecting rod resets under the action of a reset spring. The invention also discloses an electric back door lock. The invention has the advantages of low cost and capability of avoiding overlong waiting time or insufficient manual starting time.

Description

Electric back door unlocking control method and electric back door lock

Technical Field

The invention relates to the technical field of electric backdoors, in particular to an electric backdoor unlocking control method and an electric backdoor lock.

Background

When the electric tail gate is operated manually, the electric stay bar is not involved, after the door lock is released after the trigger switch is triggered, the back gate is bounced to the unlocking position by the counter force of the sealing strip and the rubber block, and then the back gate is opened by the force of a hand. However, under the working condition of back door load (uphill or snow accumulated in winter), the back door cannot be bounced open by the counter force of the sealing strips and the rubber strip blocks, and at the moment, the door lock can be quickly released from the release state, so that the back door cannot be pushed open by hands.

In order to solve the inconvenient problem of backdoor opening under the above-mentioned operating mode, there are two main solutions at present:

the first scheme is as follows: the mechanism with the snow load function is added in the door lock, and the pawl cannot reset before unlocking is completed by arranging the snow load connecting rod.

Scheme II: the software is used for carrying out snow load operation setting, and the current common practice is to set a delay after unlocking, and a client can manually push the door at the delay time.

The first solution is not an optimal solution because the cost is increased when the snow load function is added mechanically, but the second solution has the following disadvantages although the cost is low:

(1) time period t0 in FIG. 1 is the length of time that the customer can operate the tailgate during the snow condition. The customer needs to manually apply an opening force to the tailgate to open the tailgate within time t 0. But because the time is a fixed duration. If the setting is too large, the door lock cannot be reset after a delay when the door lock is normally opened electrically, and the next door lock closing operation cannot be performed. In order to avoid an abnormality of the electric function, the time is therefore usually set to be between 500ms and 1000ms, when the customer has difficulty in reacting time under snow conditions, which has elapsed when it is recognized that a manual operation is required.

(2) During snow conditions, the tailgate may be moved away from the full lock position, but still remain in the half lock position. In this case, the customer may leave the site without noticing that the back door lock is in the half-locked state and without performing corresponding treatment, resulting in a risk of water ingress into the vehicle and even safety.

Therefore, there is a need for a low-cost electric backdoor unlocking control method and an electric backdoor lock that can avoid the problems of long waiting time or insufficient manual opening time.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an electric backdoor unlocking control method and an electric backdoor lock, which are low in cost and can avoid overlong waiting time or insufficient manual opening time.

The technical scheme of the invention provides an unlocking control method for an electric backdoor, which comprises the following steps:

driving a door lock motor to enable an unlocking connecting rod to be in a release position;

setting a first set time period, starting timing, and detecting a ratchet wheel half-lock position signal;

before the first set time period is finished, when the jumping of the ratchet wheel half-lock position signal is detected, timing of the first set time period is ended, a second set time period is set and timing is started, after the second set time period is finished, the door lock motor is driven to reset, and the unlocking connecting rod is reset under the action of a reset spring;

and after the first set time period is over, the ratchet wheel half-lock position signal does not jump to drive the door lock motor to reset, and the unlocking connecting rod resets under the action of a reset spring.

Further, after the door lock motor resets, still include the following step:

detecting the ratchet wheel half-locking position signal and the ratchet wheel full-locking position signal;

and when the jumping of the ratchet wheel full-locking position signal is detected and the jumping of the ratchet wheel half-locking position signal is not detected, sucking and locking are carried out.

Further, the first set time period is greater than the second set time period.

Further, the first set time period is 5000ms, and the second set time period is 500 ms.

Further, when the back door is normally opened electrically, the door lock motor is driven to enable the unlocking connecting rod to be located at the release position;

starting timing and detecting a ratchet wheel half-lock position signal;

before the first set time period is finished, when the jumping of the ratchet wheel half-lock position signal is detected, timing of the first set time period is ended, timing of a second set time period is started, after the second set time period is finished, the door lock motor is driven to reset, and the unlocking connecting rod is reset under the action of a reset spring.

Further, when the electric backdoor is loaded, the door lock motor is driven to enable the unlocking connecting rod to be located at the release position;

starting timing and detecting a ratchet wheel half-lock position signal;

after the first set time period is over, the ratchet wheel half-lock position signal does not jump to drive the door lock motor to reset, and the unlocking connecting rod resets under the action of a reset spring;

The invention also provides an electric backdoor lock, which comprises a door lock motor, an unlocking connecting rod, a pawl and a ratchet wheel, wherein the unlocking connecting rod is driven to push the pawl when the door lock motor rotates forwards, so that the pawl relieves the limitation on the ratchet wheel, the unlocking connecting rod resets when the door lock motor rotates backwards, and the pawl resets under the action of a reset spring;

the device also comprises a control unit, wherein the control unit comprises a first timer, a first detector and a second timer;

the control unit is used for sending an unlocking signal to the door lock motor, and the door lock motor rotates forwards after receiving the unlocking signal;

the first timer is used for starting timing after the unlocking connecting rod is positioned at the release position;

the first detector is used for detecting a ratchet wheel half-locking position signal when the first timer starts timing;

when the first detector detects that the ratchet wheel half-lock position signal jumps, the first timer is stopped to time, the second timer is started to time, after the second set time period is over, the control unit sends a reset signal to the door lock motor, and the door lock motor rotates reversely after receiving the reset signal;

after the first set time period is over, the first detector detects that the ratchet wheel half-lock position signal does not jump, the control unit sends a reset signal to the door lock motor, and the door lock motor rotates reversely after receiving the reset signal.

Furthermore, the control unit further comprises a second detector, and the second detector is used for detecting a ratchet full-locking position signal after the door lock motor is reset;

when the second detector detects that the ratchet full-lock position signal jumps and the first detector detects that the ratchet half-lock position signal does not jump, the control unit controls the pull-in locking.

After adopting above-mentioned technical scheme, have following beneficial effect:

in one embodiment of the invention, when the lock is unlocked, once the ratchet wheel half-lock position signal jumps, the first timer is terminated and the second timer is started. Therefore, the requirements of manual operation time under the load working condition and the requirement of reset time during normal electric starting can be simultaneously ensured.

Drawings

The disclosure of the present invention will become more readily understood by reference to the drawings. It should be understood that: these drawings are for illustrative purposes only and are not intended to limit the scope of the present disclosure. In the figure:

fig. 1 is a control process diagram of a conventional unlocking control method for a power-operated back door;

FIG. 2 is a first state diagram of the electric backdoor latch according to the first embodiment of the present invention;

FIG. 3 is a second state diagram of the electric backdoor latch according to the first embodiment of the present invention;

FIG. 4 is a third state diagram of the electric backdoor lock according to the first embodiment of the present invention;

FIG. 5 is a fourth state diagram of the electric backdoor lock according to the first embodiment of the present invention;

FIG. 6 is a fifth state diagram of the electric backdoor lock according to the first embodiment of the present invention;

FIG. 7 is a block diagram of a control unit of the electric back door lock according to the first embodiment of the present invention;

fig. 8 is a flowchart of an electric back door unlocking control method according to a second embodiment of the present invention;

fig. 9 is a control process diagram of an electric back door unlocking control method in the third embodiment of the present invention;

fig. 10 is a control process diagram of an electric back door unlocking control method according to a fourth embodiment of the present invention;

fig. 11 is a control process diagram of an electric back door unlocking control method in the fifth embodiment of the present invention.

Reference symbol comparison table:

an unlocking link 2, a pawl 3, a ratchet 4, a control unit 5, a first timer 51, a first detector 52, a second timer 53, and a second detector 54.

Detailed Description

The following further describes embodiments of the present invention with reference to the accompanying drawings.

It is easily understood that according to the technical solution of the present invention, those skilled in the art can substitute various structures and implementation manners without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as limiting or restricting the technical aspects of the present invention.

The terms of orientation of up, down, left, right, front, back, top, bottom, and the like referred to or may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed correspondingly according to the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms.

The first embodiment is as follows:

as shown in fig. 2-7, the electric back door lock comprises a door lock motor, an unlocking connecting rod 2, a pawl 3 and a ratchet 4, wherein the door lock motor drives the unlocking connecting rod 2 to push the pawl 3 when rotating in the forward direction, so that the pawl 3 releases the limitation on the ratchet 4, the unlocking connecting rod 2 resets when the door lock motor rotates in the reverse direction, and the pawl 3 resets under the action of a reset spring;

further comprising a control unit 5 comprising a first timer 51, a first detector 52 and a second timer 53;

the control unit 5 is used for sending an unlocking signal to the door lock motor, and the door lock motor rotates forwards after receiving the unlocking signal;

the first timer 51 is used for starting timing after the unlocking connecting rod 2 is at the release position;

the first detector 52 is used for detecting a ratchet half-lock position signal when the first timer 51 starts timing;

when the first detector 52 detects that the position signal of the half-lock of the ratchet wheel jumps, the first timer 51 stops timing, the second timer 53 starts timing, and after the second set time period t2 is over, the control unit 5 sends a reset signal to the door lock motor, and the door lock motor rotates reversely after receiving the reset signal;

when the first set time period t1 is over, the first detector 52 detects that the half-lock position signal of the ratchet wheel does not jump, the control unit 5 sends a reset signal to the door lock motor, and the door lock motor rotates reversely after receiving the reset signal.

Further, the control unit 5 further comprises a second detector 54, and the second detector 54 is used for a ratchet full-locking position signal after the door lock motor is reset;

when the second detector 54 detects that the signal of the full lock position of the ratchet jumps and the first detector 52 detects that the signal of the half lock position of the ratchet does not jump, the control unit 5 controls the pull-in locking.

Specifically, a door lock motor in the electric back door lock is used for controlling the movement of the unlocking connecting rod 2, so that the unlocking connecting rod 2 can move towards or away from the pawl 3, the unlocking connecting rod 2 is used for pushing the pawl 3, and the pawl 3 can be matched with the ratchet wheel 4 so as to limit the ratchet wheel 4.

When the door lock motor rotates forwards, the door lock motor pushes the unlocking connecting rod 2 to move towards the direction of the pawl 3, the pawl 3 is separated from the ratchet 4 after rotating, and the limitation on the ratchet 4 is removed;

when the door lock motor rotates reversely, after the door lock motor is reset, the unlocking connecting rod 2 moves towards the direction far away from the pawl 3 under the action of the reset spring and returns to the initial position, and the pawl 3 resets to the initial position under the action of the reset spring (not shown) to prepare for the next suction operation.

The first detector 52 is a ratchet half-lock position signal switch, the position of the ratchet 4 is detected by the signal switch, and when the ratchet 4 enters the half-lock position, the signal switch is OFF; when the half-lock position is released, the signal switch is ON.

The second detector 54 is a ratchet full-lock position signal switch, the position of the ratchet 4 is detected by the signal switch, and when the ratchet 4 enters the full-lock position, the signal switch is OFF; when the lock is separated from the full locking position, the signal switch is ON.

Specifically, as shown in fig. 2, the ratchet 4 is in the full-lock position, and the unlocking link 2 is in the locked state (i.e., the non-release position); the signal switch of the ratchet wheel half-locking position is OFF; the ratchet full lock position signal is OFF.

When switching from the first state of fig. 2 to the second state of fig. 3, when the door lock motor rotates in the forward direction, the unlocking link 2 moves toward the pawl 3, pushing the pawl 3 to rotate clockwise, so that the pawl 3 is disengaged from the ratchet 4.

At this time, the ratchet 4 is still at the full-lock position, and the unlocking link 2 is in the release state (or at the release position); the signal switch of the ratchet wheel half-locking position is OFF; the ratchet full lock position signal is OFF.

When switching from the second state of fig. 3 to the third state of fig. 4, the ratchet 4 is disengaged from the full lock position by an external force.

At this time, the ratchet 4 is in the half-lock position, and the unlocking link 2 is in the release state (or in the release position); the signal switch of the ratchet wheel half-locking position is OFF; the ratchet full lock position signal is ON.

When switching from the third state of fig. 4 to the fourth state of fig. 5, the ratchet 4 is disengaged from the half-lock position by an external force.

At this time, the ratchet 4 is in the unlock position, and the unlock link 2 is in the release state (or in the release position); the ratchet wheel half-lock position signal switch is ON; the ratchet full lock position signal is ON.

When switching is made from the fourth state shown in fig. 5 to the fifth state shown in fig. 6, the door lock motor rotates in the reverse direction, and the unlocking link 2 and the pawl 3 are reset to prepare for the next actuation.

At the moment, the ratchet 4 is in the unlocking position, and the unlocking connecting rod 2 is in the locking position; the ratchet wheel half-lock position signal switch is ON; the ratchet full lock position signal is ON.

Wherein, the ratchet wheel half-lock position signal does not jump, namely the ratchet wheel half-lock position signal switch is OFF; the ratchet full-locking position signal jumps, namely the ratchet full-locking position signal is ON.

By implementing the embodiment, when the half-lock position signal of the ratchet wheel jumps during unlocking, the first timer 51 is terminated, and the second timer 53 is started to count. The pawl can be reset without waiting for a long time after the first set time period t1 is finished, and meanwhile, the first set time period t1 with enough time is set, so that a user can be guaranteed to have enough time to manually open the backdoor. Therefore, the requirements of manual operation time under the load working condition and the requirement of reset time during normal electric starting can be simultaneously ensured.

Example two:

as shown in fig. 8, the method for controlling unlocking of the electric back door includes the following steps:

driving a door lock motor to enable the unlocking connecting rod 2 to be in a release position;

the door lock motor can be driven in a mode that a user triggers the door lock switch.

Setting a first set time period t1 and starting timing, and detecting a ratchet wheel half-lock position signal;

before the first set time period t1 is over, when the jump of the ratchet half-lock position signal is detected,

the timing for the first set time period t1 is terminated, the second set time period t2 is set and the timing is started,

after the second set time period t2 is over, the door lock motor is driven to reset, and the unlocking connecting rod 2 is reset under the action of the reset spring;

after the first set time period t1 is over, the ratchet half-lock position signal does not jump, the door lock motor is driven to reset, and the unlocking connecting rod 2 resets under the action of the reset spring.

Further, after the door lock motor resets, still include the following step:

detecting a ratchet wheel half-locking position signal and a ratchet wheel full-locking position signal;

when the jumping of the full-locking position signal of the ratchet wheel is detected and the jumping of the half-locking position signal of the ratchet wheel is not detected, the pull-in locking is implemented;

and if the condition is not detected to be met, ending the whole process.

Further, the first set time period t1 is greater than the second set time period t 2.

When the half-lock position signal is shifted during unlocking, the first timer 51 will count down and the second timer 53 will count up. Therefore, the operating time requirement under the load condition and the resetting time requirement under the normal electric starting can be simultaneously ensured by setting a larger t1 value and a smaller t2 value.

Alternatively, the first set time period t1 is 5000ms, and the second set time period t2 is 500 ms.

Through implementing this embodiment, after the drive lock motor is accomplished to reset, judge the position of backdoor through detecting half lock position signal switch and full lock position signal switch, if detect the backdoor and break away from full lock position, but do not break away from half lock position, implement the locking operation of lock. This step of measure can ensure when the back of the body door does not have external force to open, can automatic recovery to full lock locking state, avoids appearing stopping in half lock position, and leads to the hidden danger of safety.

Example three:

as shown in fig. 9, when the back door is normally opened electrically, the door lock motor is driven to make the unlocking connecting rod 2 at the release position;

starting timing and detecting a ratchet wheel half-lock position signal;

before the first set time period t1 is over, when the jumping of the ratchet wheel half-lock position signal is detected, the timing of the first set time period t1 is ended, the timing of the second set time period t2 is started, after the second set time period t2 is over, the door lock motor is driven to reset, and the unlocking connecting rod 2 is reset under the action of a reset spring.

Under the working condition, the half-lock position signal switch jumps within the first set time period t1, the first timer 51 is stopped, the second timer 53 is started, and the reset is carried out after 500 ms. At this time, after the system is unlocked, the next door lock suction operation can be supported only by waiting for 500 ms.

Example four:

as shown in fig. 10, when the electric backdoor is loaded, the door lock motor is driven to make the unlocking link 2 in the release position;

starting timing and detecting a ratchet wheel half-lock position signal;

Since the half-lock position signal switch does not jump within the first set time period t1, the reset is performed after the first set time period t1 is completed. Since the first set time period t1 has 5000ms, the operation time requirement of the customer can be satisfied. The user has sufficient time to manually open the tailgate under load.

In addition, the embodiment can be simultaneously applied to a manual opening mode and an electric opening mode of the electric backdoor, and the development workload is reduced.

Example five:

as shown in fig. 11, when the electric backdoor is loaded, the door lock motor is driven to make the unlocking link 2 in the release position;

starting timing and detecting a ratchet wheel half-lock position signal;

after the first set time period t1 is over, the ratchet wheel half-lock position signal does not jump, the motor of the door lock 1 is driven to reset, and the unlocking connecting rod 2 resets under the action of the reset spring;

and when the jumping of the full-locking position signal of the ratchet wheel is detected and the jumping of the half-locking position signal of the ratchet wheel is not detected, the suction locking is implemented.

Unlike the fourth embodiment, the back door of the fifth embodiment is not normally opened under load, but is out of the full-lock position and in the half-lock position. The backdoor still has a certain gap. In this case, the customer may leave the site without noticing that the back door lock is in the half-locked state and without performing corresponding treatment, resulting in a risk of water ingress into the vehicle and even safety.

Therefore, in order to avoid the risk, when the jump of the ratchet full-lock position signal is detected and the jump of the ratchet half-lock position signal is not detected, the pull-in locking is implemented.

The foregoing is considered as illustrative only of the principles and preferred embodiments of the invention. It should be noted that, for those skilled in the art, several other modifications can be made on the basis of the principle of the present invention, and the protection scope of the present invention should be regarded.

Claims

1. An unlocking control method of an electric backdoor is characterized by comprising the following steps:

the first set time period is greater than the second set time period.

2. The electric back door unlocking control method according to claim 1, further comprising the steps of, after the door lock motor is reset:

3. The electric back door unlocking control method according to claim 2, wherein the first set time period is 5000ms, and the second set time period is 500 ms.

4. The electric backdoor unlocking control method according to claim 1, wherein when the backdoor is normally opened electrically, the door lock motor is driven to make the unlocking link lever be in the release position;

starting timing and detecting a ratchet wheel half-lock position signal;

5. The electric backdoor unlocking control method according to claim 1, wherein, when the electric backdoor is loaded, the door lock motor is driven to make the unlocking link lever be in the release position;

starting timing and detecting a ratchet wheel half-lock position signal;

6. The electric backdoor unlocking control method according to claim 2, wherein, when the electric backdoor is loaded, the door lock motor is driven to make the unlocking link lever be in the release position;

starting timing and detecting a ratchet wheel half-lock position signal;

7. An electric back door lock comprises a door lock motor, an unlocking connecting rod, a pawl and a ratchet wheel, wherein the unlocking connecting rod is driven to push the pawl when the door lock motor rotates in the forward direction, so that the pawl relieves the limitation on the ratchet wheel, the unlocking connecting rod resets when the door lock motor rotates in the reverse direction, and the pawl resets under the action of a reset spring;

the device is characterized by further comprising a control unit, wherein the control unit comprises a first timer, a first detector and a second timer;

8. The electric backdoor lock according to claim 7, wherein the control unit further comprises a second detector for detecting a ratchet full lock position signal after the door lock motor is reset;