Brake pre-reminding response method

Abstract

The invention provides a brake pre-reminding response method which comprises the following steps: when the vehicle speed reaches or exceeds 40km / h, if an accelerator stepping signal does not exist, cyclically detecting the current distance value d1 between the foot of a user and a laser sensor; endowing the distance value d1 obtained for the first time to a variable value 1 in the controller, and endowing the distance value d1 obtained by scanning to a variable value 2 in the controller every 2 ms; a variable value 2 in the controller is compared with a value d2 stored in the controller; if the value 2 is greater than the d2, returning to the first step; if the value 2 is smaller than d2, the next step is carried out; if the value 2-value is smaller than or equal to 8mm, returning to the first step; and if the value 2-value 1 is greater than 8mm, turning on the brake lamp. According to the invention, the brake lamp is turned on in time at the beginning of a brake flow only when a user has a brake stepping idea and action and a rear vehicle has an accident risk to the user without changing a brake lamp turning-on principle during daily safety, so that the problem that the response time of a driver of the rear vehicle is too short is solved, the operable time of the driver of the rear vehicle is prolonged, and the risk is reduced; part of traffic accidents are avoided, and the driving environment of a user is safer.

Description

Technical Field

[0001] The present invention relates to the field of vehicle braking, and particularly to a brake pre-reminder response method. Background Art

[0002] The complete braking process is that the right foot leaves the accelerator and moves towards the brake, then steps on the brake, and the brake light lights up. In the device made based on the brake pre-reminder response method, the brake light will light up in time during the process that the right foot leaves the accelerator and moves towards the brake, enabling the brake light to work in time at the beginning of the braking process, responding in time, without false alarms or random alarms, improving the reaction time of the driver of the following vehicle, and reducing traffic accidents; the existing "Vehicle Braking Early Warning Method" has many design defects: (1) It does not have the function of detecting the movement state of the foot, but simply compares the distances of two or more sensors, requiring multiple numerical comparisons. However, when one of the values is missing, such as the distance to the front obstacle, for example, when there is a large pit ahead and the brake needs to be stepped on, the pre-reminder function will completely fail because there is no obstacle ahead; (2) It does not have a distance anti-shake function. Generally, distance sensors will have inevitable numerical fluctuations. Once the data detected by their sensors fluctuate, the brake light will flash rapidly and randomly; (3) Adding two or more sensors will increase the possibility of failure. Since their logic needs to compare each value, if one of the sensor values disappears, the entire pre-reminder will completely fail; (4) The "Vehicle Braking Early Warning Method" requires an additional external millimeter-wave radar sensor, and the cost of this radar sensor is high. Summary of the Invention

[0003] The present invention provides a brake pre-reminder response method, which detects the current movement state of the user's foot, analyzes and judges whether the user makes a braking action, and when the user starts to make a braking action, the system lights up the brake light in advance to reduce the occurrence of traffic accidents.

[0004] In order to achieve the object of the present invention, the following technical solutions are adopted in the present invention:

[0005] A brake pre - reminder response method of the present invention includes the following steps: When the vehicle speed reaches or exceeds 40 km / h, if there is no accelerator pedal signal, the distance value d1 between the user's foot and the laser sensor is cyclically detected; the first obtained distance value d1 is assigned to the variable value1 in the controller, and the distance value d1 obtained by scanning is assigned to the variable value2 in the controller every 2 ms; the variable value2 in the controller is compared with the value d2 stored in the controller; if value2 > d2, return to the first step; if value2 < d2, proceed to the next step; if value2 - value1 ≤ 8 mm, return to the first step; if value2 - value1 > 8 mm, turn on the brake light.

[0006] According to an embodiment of the present invention, the value of d2 is the distance from the current vehicle brake to the laser sensor.

[0007] According to an embodiment of the present invention, if value2 - value1 > 8 mm, then the number of times the brake light is triggered within the previous 10 s is accumulated. When the number of triggers within 10 s reaches 4 times, the detection is delayed for 5 minutes and then resumed. If the number of times the brake light is triggered within 10 s is less than 4 times, the distance of the vehicle behind is detected by radar.

[0008] According to an embodiment of the present invention, when the user's current speed is between 40 km / h and 50 km / h and the vehicle behind is within 20 m of the user, the controller issues a control instruction to indicate turning on the brake light; when the user's current speed is between 51 km / h and 70 km / h and the vehicle behind is within 50 m of the user, the controller issues a control instruction to indicate turning on the brake light; when the user's current speed is between 71 km / h and 100 km / h and the vehicle behind is within 70 m of the user, the controller issues a control instruction to indicate turning on the brake light; when the user's current speed exceeds 101 km / h and the vehicle behind is within 150 m of the user, the controller issues a control instruction to indicate turning on the brake light.

[0009] In the present invention, a laser ranging sensor needs to be installed. The laser ranging sensor is installed at a position where it can detect the movement of the driver's right foot from the accelerator pedal to the brake pedal, and the laser ranging sensor is connected to the vehicle controller through a wire. The vehicle controller is then connected to the brake light. Among them, in addition to receiving signals from the laser ranging sensor, the vehicle controller can also receive the accelerator pedal signal and the current speed signal. When it is detected that the accelerator pedal signal is not triggered, the laser ranging sensor detects the current movement state of the user's foot.

[0010] In the present invention, the laser ranging sensor can obtain the current distance d1 between the user's foot and the sensor through scanning, and then assign the distance values obtained in a 2-second cycle to variables value1 and value2 in the controller. By modifying the controller code, if value2 - value1 ≤ 8mm, it returns to the first step. Most distance sensors have a certain distance jitter problem. To prevent the influence caused by jitter, through experimental data, the value within the optimal control jitter range of the laser ranging sensor is obtained as 8mm. Therefore, distance jitter of about 8mm is not taken into account, which not only performs effective anti-jitter processing but also greatly reduces the risk of false alarms.

[0011] In the present invention, the controller sets a detection range in the code, compares the variable value2 in the controller with the value d2 stored in the controller to limit the ranging scope, and controls the detection range within the distance between the brake and the laser sensor. When the right foot deeply steps on the accelerator or other operations cause the laser ranging sensor to miss the foot and detect other objects on the left, the sensor will not falsely turn on the brake light, thus solving the false alarm in this regard.

[0012] In the present invention, the controller accumulates the number of times the brake light is triggered within the previous 10s. When the number of triggers reaches 4 times within 10s, it will delay for 5 minutes and then conduct detection again to reduce the impact of the user's risky driving and misoperations on the following vehicle.

[0013] In the present invention, the controller receives the distance of the following vehicle detected by the radar and the current speed of the user. When the user's current speed is between 40 km / h and 50 km / h and the following vehicle is within 20 m of the user, the brake light is turned on; when the user's current speed is between 51 km / h and 70 km / h and the following vehicle is within 50 m of the user, the brake light is turned on; when the user's current speed is between 71 km / h and 99 km / h and the following vehicle is within 70 m of the user, the brake light is turned on; when the user's current speed exceeds 100 km / h and the following vehicle is within 150 m of the user, the brake light is turned on. This can enable the following vehicle to react within a safe distance and reduce the occurrence of traffic accidents such as rear-end collisions.

[0014] In summary, the present invention has the following beneficial effects: In the present invention, by detecting the movement state of the foot to determine whether the user is performing a braking action, it solves the problem that the brake light does not respond at the beginning of the braking action. At the same time, it also solves the distance jitter problem brought by the laser ranging sensor. The brake light responds at the beginning of the braking action, increasing the reaction time and processing time of the following vehicle driver, making the user's traffic environment safer and reducing the number of traffic accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation to the present invention. In the drawings:

[0016] Figure 1 It is a schematic diagram showing the placement position of the laser ranging sensor of the present invention on a vehicle according to an exemplary embodiment;

[0017] Figure 2 It is a schematic diagram showing the connection relationship among the laser ranging sensor, the controller and the brake light according to an exemplary embodiment;

[0018] Figure 3 It is a schematic diagram showing the operation of the brake pre - reminder response method according to an exemplary embodiment;

[0019] In the figure: 1. Laser ranging sensor; 2. Controller; 3. Brake light. Detailed implementation mode

[0020] Now, the exemplary embodiments will be described more comprehensively with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; on the contrary, these embodiments are provided so that the present invention will be thorough and complete, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. The same reference numerals in the figures denote the same or similar structures, and thus their detailed descriptions will be omitted. Embodiment 1

[0021] As Figure 1 and Figure 2 shown, an embodiment provided by the present invention: Install the laser ranging sensor 1 on the side body of the vehicle. The laser ranging sensor 1 is installed at a position where it can detect the movement of the driver's right foot from the accelerator to the brake, and then connect to the controller 2 through a wire, and the controller 2 is then connected to the brake light 3.

[0022] When the controller 2 does not receive the throttle signal and whether the user's current speed is greater than or equal to 40 km / h, it cyclically detects the current distance value d1 between the user's foot and the laser sensor; assigns the first obtained distance value d1 to the variable value1 in the controller, and assigns the scanned distance value d1 to the variable value2 in the controller every 2 ms; compares the variable value2 in the controller with the value d2 stored in the controller; if value2 > d2, return to the first step; if value2 < d2, proceed to the next step; if value2 - value1 ≤ 8 mm, return to the first step; if value2 - value1 > 8 mm, collect the number of times the brake light is triggered in the previous 10 s. When the number of triggers in the previous 10 s reaches 4, delay for 5 minutes and then conduct the detection. If the number of times the brake light is triggered in the previous 10 s is less than 4, start detecting the distance of the vehicle behind with the radar.

[0023] Preferably, when the user's current speed is between 40 km / h and 50 km / h and the vehicle behind is within 20 m of the user, the controller issues a control instruction to indicate turning on the brake light; when the user's current speed is between 51 km / h and 70 km / h and the vehicle behind is within 50 m of the user, the controller issues a control instruction to indicate turning on the brake light; when the user's current speed is between 71 km / h and 100 km / h and the vehicle behind is within 70 m of the user, the controller issues a control instruction to indicate turning on the brake light; when the user's current speed exceeds 101 km / h and the vehicle behind is within 150 m of the user, the controller issues a control instruction to indicate turning on the brake light.

[0019] Working principle: By modifying the controller code, the controller receives the throttle signal and the user's current speed, enabling the laser distance sensor and the controller to detect the movement state of the foot. The laser distance sensor 1 transmits the detected foot information to the controller 2. If it detects that the foot is moving from the throttle to the brake to perform a braking action and the number of triggers within 10 s is less than 4, when the environment requires the user to turn on the brake light during the start of the braking process to reduce risks, the controller 2 transmits a signal to turn on the brake light 3, which is more timely than the traditional response method, giving the driver of the vehicle behind more time to react, thereby reducing the occurrence of traffic accidents. There is also distance anti-shake and setting an appropriate measurement distance to greatly reduce the situation of false braking light illumination.

[0020] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A brake warning response method, characterized in that: The steps include: When the vehicle speed reaches or exceeds 40km / h, if there is no accelerator signal, the current distance d1 between the user's foot and the laser sensor is detected cyclically; The first distance value d1 is assigned to the variable value1 in the controller, and the distance value d1 obtained by scanning every 2ms is assigned to the variable value2 in the controller; Compare the variable value2 in the controller with the value d2 stored in the controller; If value2>d2, return to the first step; If value2<d2, proceed to the next step; If value2-value1≤8mm, return to the first step; If value2-value1>8mm, the brake light will turn on.

2. The brake warning response method according to claim 1, characterized in that: The d2 value is the distance from the current vehicle brake to the laser sensor.

3. The brake warning response method according to claim 1, characterized in that: If value2-value1>8mm, then the number of times the brake light is triggered in the previous 10s is accumulated. If it is triggered 4 times within 10s, it will be delayed for 5 minutes before testing again. If the number of times the brake light is triggered within 10s is less than 4 times, the radar will start to detect the distance to the vehicle behind.

4. The brake warning response method according to claim 1, characterized in that: When the user's current speed is 40km / h to 50km / h and the vehicle behind is within 20m from the user, the controller sends a vehicle control instruction to light up the brake lights; when the user's current speed is 51km / h to 70km / h and the vehicle behind is within 50m from the user, the controller sends a vehicle control instruction to light up the brake lights; when the user's current speed is 71km / h to 100km / h and the vehicle behind is within 70m from the user, the controller sends a vehicle control instruction to light up the brake lights; when the user's current speed exceeds 101km / h and the vehicle behind is within 150m from the user, the controller sends a vehicle control instruction to light up the brake lights.

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