CN111896963A

CN111896963A - Sensor detection method for opening of automobile tail gate

Info

Publication number: CN111896963A
Application number: CN202010719915.3A
Authority: CN
Inventors: 王利云
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-23
Filing date: 2020-07-23
Publication date: 2020-11-06

Abstract

The invention discloses a sensor detection method for opening an automobile tail door, which comprises the following steps: s1, arranging an ultrasonic sensor below a rear bumper of an automobile, and setting a kick signal detected within a time range as an effective signal and an illegal kick signal which is not within the time range; s2, setting the sequence process of the set signal change as a valid signal, and setting the sequence process as an illegal kicking signal. The invention adopts the ultrasonic sensor for detection, and adopts a good detection strategy: the set time range and the signal change process realize reliable detection and reduce false actuation, namely the false actuation can be reliably identified when the 'kicking' action is really available, and the false actuation can not be identified as the 'kicking' action by mistake when the 'kicking' action is not available.

Description

Sensor detection method for opening of automobile tail gate

Technical Field

The invention relates to the field of vehicle control systems, in particular to a sensor detection method for opening an automobile tail door.

Background

Generally, a sensor for opening a tail gate (or called a trunk) of an automobile adopts a capacitance induction type, namely two antennas are installed on a bumper, a controller host judges whether a 'kick' action exists or not according to the capacitance value change induced by the antennas, information is transmitted to a PEPS (Passive Entry Passive Start, keyless Entry and Start system) through LIN and other signal lines, the PEPS searches for a key after receiving a tail gate opening request signal, and if the key is nearby, the tail gate pull rod system is informed to Start the tail gate to be opened. This conventional approach typically requires the use of two antennas and a controller.

For example, chinese patent document CN106882023B discloses a method for controlling opening of a tail gate of an automobile, which includes: detecting the kicking action in the detection area of the sensor and judging whether the kicking action is correct or not; the sensor is arranged on one side of the rear bumper of the automobile, which is close to the driver seat; the sensor is fixed on one side of the rear bumper of the automobile, which is close to the driver seat, and behind the rear wheel fender through a bracket, the bracket is also provided with at least 4 fixing points, and the bracket and the rear bumper of the automobile are fixed through at least 4 fixing points;

when the PEPS system receives a signal that the kicking action is correct and the PEPS system determines that the tail door of the automobile is in a locked state currently, whether an intelligent key corresponding to the automobile exists in a set key searching area or not is detected;

if the corresponding intelligent key exists, sending a tail gate opening request to the automobile body control module through the PEPS system, wherein the tail gate opening request is used for triggering the automobile body control module to control the automobile tail gate to be unlocked;

whether the intelligent key corresponding to the automobile exists in the set key searching area or not is detected, and the method comprises the following steps: detecting whether at least one door of the automobile is in an open state; if yes, detecting whether an intelligent key corresponding to the automobile exists in a set key searching area through a set first antenna; otherwise, detecting whether the intelligent key corresponding to the automobile exists in the set key searching area through the first antenna and the set second antenna;

the first antenna is arranged on a rear bumper of the automobile, and the second antenna is arranged on a front door handle position on the driver side of the automobile.

In order to determine whether the kicking action is correct, patent document CN106882023B discloses a technical solution: and detecting an electric field change value between the sensor and the ground electric field when the kick action occurs, converting the electric field change value into a corresponding voltage waveform, and judging whether the kick action is correct or not according to the voltage waveform.

However, the capacitive sensing scheme has high cost and troublesome installation, and can cause misoperation, namely, the capacitive sensing scheme has no kicking action and is mistakenly identified as the kicking action to mistakenly open the automobile tail door.

Disclosure of Invention

In view of the above, in order to solve the above technical problems, an object of the present invention is to provide a sensor detection method for opening a tailgate of an automobile, which realizes reliable detection, reduces erroneous actuation, is low in cost, and is easy to install.

The adopted technical scheme is as follows:

a sensor detection method for opening of an automobile tail gate comprises the following steps:

s1, arranging an ultrasonic sensor below a rear bumper of an automobile, and setting a kick signal detected within a time range as an effective signal and an illegal kick signal which is not within the time range;

s2, setting the sequence process of the set signal change as a valid signal, and setting the sequence process as an illegal kicking signal.

Further, in S1, the detected foot signal within the time of 400-800mS is set as the valid signal.

Further, in S2, the sequence of the change of the set signal is: the process of no signal → far signal → near signal → prolonged signal → near signal → far signal → no signal; or no signal → near signal → prolonged signal → near signal → no signal; or the process of no signal → far signal → prolonged signal → near signal → no signal.

Further, in S1, the detection interval time is a natural number of several milliseconds, several 10 or less.

Further, before S1, the method further includes the following steps:

s11, setting a probe to detect whether a person approaches and is in a close-range position behind a rear bumper of the automobile; the probe is arranged above a rear bumper of the automobile.

Further, the number of the probes is 1, 2, 3 or 4.

Further, the method also comprises the following steps:

and S3, regularly detecting by taking the ground as an obstacle, and if the detection cannot be carried out or the detection signal is very small, considering that the probe fails or is covered by mud, and sending a signal for reminding.

A computer-readable storage medium, on which a computer program is stored, characterized in that the program realizes the steps of the above-mentioned method when executed by a processor.

The invention has the beneficial effects that:

the invention adopts the ultrasonic sensor for detection, and adopts a good detection strategy: the set time range and the signal change process realize reliable detection and reduce false actuation, namely the false actuation can be reliably identified when the 'kicking' action is really available, and the false actuation can not be identified as the 'kicking' action by mistake when the 'kicking' action is not available.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic diagram of a change process of no signal → far signal → near signal → prolonged signal in embodiment 1.

Fig. 2 is a schematic view of the kick operation in embodiment 1.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only preferred embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 1 and 2, a sensor detection method for opening of a tailgate of an automobile includes the steps of:

s1, arranging an ultrasonic sensor below a rear bumper of an automobile, and setting a kick signal detected within a time range as an effective signal and setting an illegal kick signal out of the time range. This step simulates the actual kick time, which is typically about 600mS for a conventional "kick" operation, so that the kick signal defined within a time range including, but not limited to, for example, 400 + 800mS is considered as a valid signal, and the excess or insufficient portion is an illegal kick signal, so as to reduce the false activation caused by the illegal kick signal. The range can be adjusted by those skilled in the art, for example, 400-.

S2, setting the sequence process of the set signal change as a valid signal, and setting the sequence process as an illegal kicking signal. The normal kick signal should be: the sequence of the change of the no signal → the far signal → the near signal → the long signal → the near signal → the far signal → the no signal is considered to be a valid kick signal if the sequence is recognized. Referring to fig. 1, fig. 1 is a schematic diagram illustrating a part of a signal change process. In practical applications, to balance the relationship between reliable detection and malfunction, the above procedure is not necessarily completely followed, and some requirements may be omitted, including but not limited to: no signal → near signal → prolonged signal → near signal → no signal; or no signal → far signal → long signal → near signal → no signal, etc. can be considered as a kick signal, because if the weight is too heavy, it may cause the situation that the false action will not occur but the detection is often not reliable or the false action rate is high. Therefore, the sequence process of the signal changes can be preset, and the effective kick signal can be judged as long as the sequence process of one signal change is met within the set time.

That is, the sequential process of signal change and time range set in advance need to be satisfied at the same time to be considered as effective kick signal. Otherwise, the signal is regarded as an invalid kick signal, so that reliable detection is realized, and misoperation is reduced, namely the signal can be reliably identified when the kick action is really available, and the signal cannot be identified as the kick action by mistake and is misactuated when the kick action is not available.

In order to improve the detection speed, the detection interval time of dozens of milliseconds of the conventional ultrasonic radar is generally not adopted, but is improved to a few milliseconds, so that the detection times in unit time are more, and the kicking effectiveness is higher. Wherein "several" is a natural number within 10, such as 10, 9, 8, 7, 6, or 5, etc.

Example 2

In the development and starting stage of the automobile, the automobile electronics are not developed, the installation rate of the reversing radar product is low, and the reversing radar can be configured only for highly matched automobile models. With the development of the technology and the reduction of the cost, the existing reversing radar products are almost standard, so the method is extended and used on the basis of the reversing radar function, and the tail gate opening function is added.

Generally, 2-4 ultrasonic radar probes are mounted on a rear bumper of an automobile, for example, the following 4-probe configuration automobile model is adopted, and the following 4-probe is taken as an example for description.

The radar system can adopt a traditional radar system with a host, and can also adopt a currently popular radar system without a host, and only one channel is added on the basis of the system, for example, the original 4 channels are added to 5 channels, and the added 5 th channel is added: the ultrasonic sensor is arranged below the rear bumper of the automobile, preferably arranged right below the rear bumper of the automobile and used for detecting the action of opening the tail door (trunk) of the automobile by the kick of a main user of the automobile.

Therefore, the sensor detection method for opening the automobile tail gate of the embodiment comprises the following steps:

s11, setting a probe to detect whether a person approaches and is in a close-range position behind a rear bumper of the automobile; the probe is arranged above the rear bumper of the automobile. The probe of this embodiment is 4 radar probes.

S1, arranging an ultrasonic sensor below a rear bumper of an automobile, and setting a kick signal detected within a time range as an effective signal and an illegal kick signal which is not within the time range; the 4 radar probes are respectively a first probe, a second probe, a third probe and a fourth probe, and the ultrasonic sensor is a fifth probe.

S2, setting the sequence process of the set signal change as a valid signal, and setting the sequence process as an illegal kicking signal. The specific time ranges of steps S1 and S2 and the specific sequence of signal changes can refer to the description of embodiment 1, and this embodiment is not repeated.

In order to prevent system misoperation caused by external interference such as ground cats and dogs, flowers and plants, rain and the like, the method for detecting the opening of the automobile tail door in the embodiment adopts 1 probe, for example, the second probe or the third probe firstly detects whether a person approaches and is at a close position behind a rear bumper of the automobile, then the fifth probe is started to detect the 'kicking foot' action, and as the 'kicking foot' is the action of lifting the leg first and then kicking forwards, the 'kicking foot' time needs to be set, for example, 400 + 800mS, preferably 800mS, and the fifth probe needs to detect the 'kicking foot' process that the foot slowly approaches and slowly leaves within 800mS, for example, the sequence process of 'no signal → far signal → near signal → long singing signal → far signal → no signal' is considered as a correct action, and other things are slow, namely, The abnormal signal change process generated by the abnormal action of rapid and foot transverse scanning is regarded as illegal 'kicking' action, so as to correctly distinguish the legal 'kicking', and prevent the system from being actuated by mistake.

The double insurance judgment of combining the two probes can greatly reduce the misoperation of the system.

In the above embodiment, a probe (i.e., an ultrasonic sensor) is added on the basis of a mature radar system, and the method of the present invention is adopted, wherein a power supply system is changed into a BATTERY mode (because the tailgate opening system works under a flameout condition, the radar system powered by the original reverse gear power supply or IGN power supply needs to be changed into a normal power supply, i.e., the BATTERY power supply), so that the automobile tailgate opening function can be reliably realized, and the increased cost is the cost of only one probe, which is expected to be saved by more than 100% compared with the traditional capacitive cost, and is considerable.

Example 3

Referring to embodiment 2, on the basis of embodiment 2, the method further includes the following steps:

Because the fifth probe is installed under the rear bumper of the automobile, the risk that the performance is affected by mud covering exists, the fifth probe needs to periodically use the ground as a barrier to perform self-judgment, namely the normal fifth probe can detect the barrier on the ground, if the detection is impossible or the detection signal is very small, the probe is considered to be invalid or covered by mud, and a signal is timely sent to remind the whole automobile to check whether the probe is covered by mud or invalid.

A computer-readable storage medium may be provided, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned inventive method.

In order to further improve the reliability, the computer program can further simulate and collect conventional 'skirting' signals, carry out deep learning according to various interference condition signals in reality, such as automobile horn tone interference, underground antenna interference, launching tower signal interference and the like, intelligently identify effective 'skirting' signals, filter interference signals and further improve the reliability of the system.

It will be understood by those skilled in the art that all or part of the processes of the methods of the above embodiments may be implemented by a computer program, which is stored in a computer readable storage medium and sold or used as a stand-alone product. The program, when executed, may perform all or a portion of the steps of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-only Memory (ROM), a Random Access Memory (RAM), or the like.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. A sensor detection method for opening of an automobile tail gate is characterized by comprising the following steps:

2. The method as claimed in claim 1, wherein in S1, the foot signal detected within the time of 400-800mS is set as the valid signal.

3. The sensor detecting method for opening of a tailgate of an automobile according to claim 1, wherein in S2, the sequence of the change of the set signal is: the process of no signal → far signal → near signal → prolonged signal → near signal → far signal → no signal; or no signal → near signal → prolonged signal → near signal → no signal; or the process of no signal → far signal → prolonged signal → near signal → no signal.

4. The sensor detecting method for the opening of the tailgate of an automobile according to claim 1, wherein in S1, the detection interval time is a natural number within 10 milliseconds.

5. The method for detecting the opening of the tailgate of a vehicle, according to claim 1, further comprising the step of, before S1:

6. The method as claimed in claim 5, wherein the number of the probes is 1, 2, 3 or 4.

7. The sensor detection method for the opening of the tailgate of a vehicle according to claim 5, characterized by comprising the following further steps:

8. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.