阅读说明：本技术 一种预防前挡风玻璃低温结冰的控制方法 (Control method for preventing front windshield from being frozen at low temperature ) 是由 李枝阳 林泽蓬 蒋才科 于 2021-04-30 设计创作，主要内容包括：本发明提供预防前挡风玻璃低温结冰的控制方法,方法包括：S1、获取前挡风玻璃外侧的表面温度；S2、当所述表面温度低于预设温度阈值时执行下一步；S3、当检测到本车相邻车道的前方路段有积水区域时执行下一步；S4、当检测到所述积水区域对应的车道有来车时进入下一步；S5、执行预设操作。本发明实现了有效预防前挡风玻璃低温遇水结冰,从而降低因前挡风玻璃视野被遮挡而发生交通事故的风险。(The invention provides a control method for preventing low-temperature icing of a front windshield, which comprises the following steps: s1, obtaining the surface temperature of the outer side of the front windshield; s2, executing the next step when the surface temperature is lower than a preset temperature threshold; s3, executing the next step when detecting that the front road section of the adjacent lane of the vehicle has the water accumulation area; s4, entering the next step when detecting that the corresponding lane of the water accumulation area has an incoming vehicle; and S5, executing preset operation. The invention realizes the effective prevention of the front windshield from being frozen when meeting water at low temperature, thereby reducing the risk of traffic accidents caused by the fact that the view of the front windshield is blocked.)

1. A control method for preventing low-temperature icing of a front windshield is characterized by comprising the following steps:

s1, obtaining the surface temperature of the outer side of the front windshield;

s2, executing the next step when the surface temperature is lower than a preset temperature threshold;

s3, executing the next step when detecting that the front road section of the adjacent lane of the vehicle has the water accumulation area;

s4, entering the next step when detecting that the corresponding lane of the water accumulation area has an incoming vehicle;

and S5, executing preset operation.

2. The control method for preventing low-temperature icing of the front windshield according to claim 1, wherein after the step S4, the method further comprises:

and S41, executing the next step when judging that the incoming vehicle will roll the ponding area.

3. The control method for preventing low-temperature icing of the front windshield according to claim 2, further comprising, after the step S41:

and S42, calculating the accumulated water splashing track and the splashing height, and executing the next step when the accumulated water is judged to be capable of splashing to the front windshield.

4. The control method for preventing low-temperature icing of the front windshield according to claim 3, wherein the step S42 comprises:

s4201, judging whether the accumulated water splashing height is higher than the height of the engine cover of the vehicle;

s4202, when the accumulated water splashing height is judged to be higher than the height of the engine cover of the vehicle, determining a motion trail equation of the front windshield in the accumulated water coordinate system;

s4203, calculating according to the front windshield movement track equation and the accumulated water splashing track equation to obtain accumulated water contact time;

s4204, resolving according to the ponding contact time and the ponding splashing track equation to obtain a ponding contact coordinate;

and S4205, judging whether the accumulated water can splash onto the front windshield according to the accumulated water contact coordinate.

5. The control method for preventing low-temperature icing of a front windshield according to claim 4, wherein the step S4201 comprises:

s4201a, establishing a ponding coordinate system, wherein the ponding coordinate system takes a point, closest to the coming vehicle, in the ponding area as an origin, the driving direction of the coming vehicle as an X-axis forward direction, the horizontal left direction as a Y-axis forward direction, and the vertical upward direction as a Z-axis forward direction;

s4201b, determining a ponding splashing track equation;

s4201c, calculating the maximum height of the accumulated water splash;

s4201d, judging whether the maximum height of the accumulated water splashing is larger than the height of the engine cover.

6. The control method for preventing the low-temperature icing of the front windshield according to claim 5, wherein the accumulated water splashing trajectory equation is as follows:

wherein va is the driving speed of the coming vehicle, h is the water accumulation depth, t is the motion time parameter, R is the tire radius of the coming vehicle, and g is the gravity acceleration.

7. The control method for preventing low-temperature icing of the front windshield according to claim 6, wherein the maximum height of the accumulated water splashing is as follows:

in the formula, Hmax is the maximum height of the accumulated water splashing, va is the running speed of the coming vehicle, h is the accumulated water depth, R is the tire radius of the coming vehicle, and g is the gravity acceleration.

8. The control method for preventing low-temperature icing of a front windshield according to claim 6, wherein the water contact coordinate is as follows:

9. the control method for preventing low-temperature icing of the front windshield according to claim 1, wherein after the step S5, the method further comprises:

and S6, displaying the road image of the road section in front of the vehicle on the display screen in the vehicle.

10. The control method for preventing low-temperature icing of the front windshield according to claim 9, wherein after the step S6, the method further comprises:

and S7, controlling the double flashing lamps to be turned on.

11. The control method for preventing low-temperature icing of front windshield according to claim 10, further comprising, after the step S7:

and S8, when the vision of the front windshield is judged to be normal, the road image display and the double flashing lamps of the road section in front of the vehicle are turned off.

12. The control method for preventing low-temperature icing of the front windshield according to any one of claims 1 to 11, wherein the preset operation comprises at least one of the following modes:

heating the front windshield to enable the outside temperature of the front windshield to be higher than the preset temperature threshold;

spraying hot water to the front windshield to enable the temperature of the outer side of the front windshield to be higher than the preset temperature threshold value, and starting the windscreen wiper;

and spraying anti-freezing glass water to the front windshield and starting the windscreen wiper.

Technical Field

The invention relates to the technical field of auxiliary driving, in particular to a control method for preventing front windshield from being frozen at a low temperature.

Background

In winter in high latitudes, the accumulated water on the road still exists in a liquid state due to repeated rolling of wheels, or although a layer of ice is formed on the surface, the water below the ice layer still exists in a liquid state. If these ponding are located the place ahead on this car adjacent lane, then when other vehicles make the ponding highway section of getting into, then can roll ponding to lead to ponding to splash on this car front windshield, water can be constantly to the latent heat of release of air at the in-process that splashes, if the temperature of front windshield is lower this moment, then can lead to splashing to the ponding on the windshield at once to freeze, the windscreen wiper can't scrape it off, and the front windshield light transmittance covered by the ice sheet is extremely poor, the driver can't see the road conditions in the place ahead clearly, very easy traffic accident takes place.

Therefore, a technology capable of preventing such a situation from occurring is required to secure driving safety.

Disclosure of Invention

The invention provides a control method for preventing front windshield from being frozen at low temperature, which aims to overcome the defects in the prior art and effectively prevent the front windshield from being frozen when meeting water at low temperature, so that the risk of traffic accidents caused by the fact that the view of the front windshield is shielded is reduced.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the invention provides a control method for preventing low-temperature icing of a front windshield, which comprises the following steps:

s1, obtaining the surface temperature of the outer side of the front windshield;

s2, executing the next step when the surface temperature is lower than a preset temperature threshold;

s3, executing the next step when detecting that the front road section of the adjacent lane of the vehicle has the water accumulation area;

s4, entering the next step when detecting that the corresponding lane of the water accumulation area has an incoming vehicle;

and S5, executing preset operation.

Further, after the step S4, the method further includes:

and S41, executing the next step when judging that the incoming vehicle will roll the ponding area.

Further, after the step S41, the method further includes:

and S42, calculating the accumulated water splashing track and the splashing height, and executing the next step when the accumulated water is judged to be capable of splashing to the front windshield.

Specifically, the step S42 includes:

s4201, judging whether the accumulated water splashing height is higher than the height of the engine cover of the vehicle;

s4202, when the accumulated water splashing height is judged to be higher than the height of the engine cover of the vehicle, determining a motion trail equation of the front windshield in the accumulated water coordinate system;

s4203, calculating according to the front windshield movement track equation and the accumulated water splashing track equation to obtain accumulated water contact time;

s4204, resolving according to the ponding contact time and the ponding splashing track equation to obtain a ponding contact coordinate;

and S4205, judging whether the accumulated water can splash onto the front windshield according to the accumulated water contact coordinate.

Specifically, the step S4201 includes:

s4201a, establishing a ponding coordinate system, wherein the ponding coordinate system takes a point, closest to the coming vehicle, in the ponding area as an origin, the driving direction of the coming vehicle as an X-axis forward direction, the horizontal left direction as a Y-axis forward direction, and the vertical upward direction as a Z-axis forward direction;

s4201b, determining a ponding splashing track equation;

s4201c, calculating the maximum height of the accumulated water splash;

s4201d, judging whether the maximum height of the accumulated water splashing is larger than the height of the engine cover.

Specifically, the accumulated water splashing trajectory equation is as follows:

wherein va is the driving speed of the coming vehicle, h is the water accumulation depth, t is the motion time parameter, R is the tire radius of the coming vehicle, and g is the gravity acceleration.

Specifically, the maximum height of the accumulated water splash is:

in the formula, Hmax is the maximum height of the accumulated water splashing, va is the running speed of the coming vehicle, h is the accumulated water depth, R is the tire radius of the coming vehicle, and g is the gravity acceleration.

Specifically, the water contact coordinate is:

further, after step S5, the method further includes:

and S6, displaying the road image of the road section in front of the vehicle on the display screen in the vehicle.

Further, after the step S6, the method further includes:

and S7, controlling the double flashing lamps to be turned on.

Further, after the step S7, the method further includes:

and S8, when the vision of the front windshield is judged to be normal, the road image display and the double flashing lamps of the road section in front of the vehicle are turned off.

Specifically, the preset operation includes at least one of the following modes:

heating the front windshield to enable the outside temperature of the front windshield to be higher than the preset temperature threshold;

spraying hot water to the front windshield to enable the temperature of the outer side of the front windshield to be higher than the preset temperature threshold value, and starting the windscreen wiper;

and spraying anti-freezing glass water to the front windshield and starting the windscreen wiper.

In particular, the preset temperature threshold is 0 °.

The invention has the beneficial effects that: according to the invention, by acquiring the surface temperature of the outer side of the front windshield, when the surface temperature is lower than the preset temperature threshold value and the water accumulation area is arranged in the front road section of the adjacent lane of the vehicle and the corresponding lane of the water accumulation area has a vehicle coming, the preset operation of preventing low-temperature icing is executed, so that the purpose of effectively preventing the front windshield from icing when meeting water at low temperature is realized, and the risk of traffic accidents caused by the fact that the view of the front windshield is shielded is reduced.

Drawings

Fig. 1 is a schematic flow chart of a control method for preventing low-temperature icing of a front windshield according to the invention.

Detailed Description

The embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are for reference and illustrative purposes only and are not intended to limit the scope of the invention.

Example 1

As shown in fig. 1, the present embodiment provides a control method for preventing low-temperature icing of a front windshield, including:

and S1, acquiring the surface temperature of the outer side of the front windshield.

In a specific embodiment, the surface temperature of the outside of the front windshield of the host vehicle is acquired by a temperature sensor. In one embodiment, a temperature sensor can be attached to the outside of the front windshield, by means of which the temperature of the front windshield is monitored in real time after the vehicle has started.

And S2, when the surface temperature is lower than the preset temperature threshold value, executing the next step.

The preset temperature threshold may be obtained by experimental calibration. In this embodiment, the preset temperature threshold is 0 °.

The steps S1 and S2 can better prevent the windshield from being frozen when encountering water by detecting the surface temperature of the outer side of the front windshield and taking the temperature as the monitoring initial judgment condition.

And S3, executing the next step when detecting that the road section in front of the adjacent lane of the vehicle has the water accumulation area.

In specific implementation, a camera arranged in or outside a vehicle can be used for acquiring a road image of a road section ahead, and whether a water accumulation area exists or not is identified in an image identification mode.

The smoothness and the reflection condition of the water accumulation area (including the water accumulation area covered by the ice layer) are different from those of a normal road surface, and the gray value of the water accumulation area is obviously higher than that of the normal road surface in the image, so that the water accumulation area can be identified more quickly and accurately in an image identification mode.

The order of the steps S2 and S3 may be reversed.

And S4, when detecting that the corresponding lane of the water accumulation area has the vehicle coming, entering the next step.

In specific implementation, a camera arranged in or outside the vehicle can be used for acquiring a rear road image of a lane corresponding to the ponding area, and whether a vehicle comes or not is identified in an image identification mode.

And S5, executing preset operation.

The preset operation comprises at least one of the following modes:

heating the front windshield to enable the outside temperature of the front windshield to be higher than the preset temperature threshold;

spraying hot water to the front windshield to enable the temperature of the outer side of the front windshield to be higher than the preset temperature threshold value, and starting the windscreen wiper;

and spraying anti-freezing glass water to the front windshield and starting the windscreen wiper.

Example 2

Unlike embodiment 1, this embodiment further includes, after step S4 of embodiment 1:

and S41, executing the next step when judging that the incoming vehicle will roll the ponding area.

Whether the incoming vehicle can crush the ponding area can be accurately judged by adding the step, and the action of preventing icing is not needed to be started if the incoming vehicle cannot crush the ponding area, so that the accuracy of the system is further improved.

Example 3

Unlike embodiment 2, this embodiment further includes, after step S41 of embodiment 2:

and S42, calculating the accumulated water splashing track and the splashing height, and executing the next step when the accumulated water is judged to be capable of splashing to the front windshield.

In this embodiment, the step S42 includes:

s4201, judging whether the accumulated water splashing height is higher than the height of the engine cover of the vehicle.

In this embodiment, the step S4201 includes:

s4201a, establishing a ponding coordinate system, wherein the ponding coordinate system takes a point, closest to the coming vehicle, in the ponding area as an origin, the driving direction of the coming vehicle is taken as an X-axis forward direction, the horizontal leftward direction is taken as a Y-axis forward direction, and the vertical upward direction is taken as a Z-axis forward direction.

And S4201b, determining a water splashing track equation.

In this embodiment, the water splashing trajectory equation is:

wherein va is the driving speed of the coming vehicle, h is the water accumulation depth, t is the motion time parameter, R is the tire radius of the coming vehicle, and g is the gravity acceleration.

The depth h of the water accumulation can be obtained by detecting the prior art, such as sonar technology, radar technology and the like, and is not described in detail herein.

The tire radius R of the coming vehicle can be obtained by image recognition, and is not described in detail herein.

And S4201c, calculating the maximum height of the accumulated water splash.

The maximum height that ponding splashes is:

in the formula, Hmax is the maximum height of the accumulated water splashing, va is the running speed of the coming vehicle, h is the accumulated water depth, R is the tire radius of the coming vehicle, and g is the gravity acceleration.

S4201d, judging whether the maximum height of the accumulated water splashing is larger than the height of the engine cover.

The maximum height of the accumulated water splashing is compared with the height of the engine cover from the ground, and then judgment can be carried out.

S4202, when the accumulated water splashing height is judged to be higher than the height of the engine cover of the vehicle, determining a motion trail equation of the front windshield in the accumulated water coordinate system.

In this embodiment, the equation of the motion trajectory of the front windshield is:

where vb is the traveling speed of the vehicle, x₀The forward distance, y, between the front windshield and the water accumulation area when a vehicle enters the water accumulation area₀Is the lateral distance, z, of the front windshield from the water-accumulating area₀The height of the front windshield from the water accumulation area is shown, and t is a motion time parameter.

And S4203, calculating according to the front windshield movement track equation and the accumulated water splashing track equation to obtain accumulated water contact time.

The water contact time is the time it takes to assume that the water splashes from the beginning to contact the front windshield.

Specifically, x is ═ x₀+v_bSubstituting t into the accumulated water splashing track equation to obtain the accumulated water contact time:

and S4204, resolving according to the ponding contact time and the ponding splashing track equation to obtain a ponding contact coordinate.

The ponding contact coordinate is the coordinate after the ponding contact time from the beginning of the ponding splashing.

In this embodiment, the water contact coordinate is:

and S4205, judging whether the accumulated water can splash onto the front windshield according to the accumulated water contact coordinate.

Specifically, if the y-axis coordinate of the ponding contact coordinate is not less than the lateral distance y0 between the front windshield and the ponding area and the z-axis coordinate of the ponding contact coordinate is not less than the height z0 between the front windshield and the ponding area, the ponding energy is judged to splash onto the front windshield.

This step can judge in advance whether ponding can splash to front windshield through discerning ponding splash height and vehicle and ponding distance to prevent front windshield to meet water and freeze better.

Example 4

Unlike embodiment 1, 2 or 3, this embodiment further includes, after step S5 of embodiment 1, 2 or 3:

and S6, displaying the road image of the road section in front of the vehicle on the display screen in the vehicle.

In specific implementation, a camera is installed at the front part of the vehicle, the camera is started while preset operation is executed, and a picture shot by the camera is displayed on a display screen (such as a central control display screen or an IVI display screen) in the vehicle, so that a driver can watch the road condition ahead in time.

Example 5

Unlike embodiment 4, this embodiment further includes, after step S6:

and S7, controlling the double flashing lamps to be turned on.

Through the steps, the dangerous state of the vehicle is displayed, the vehicle at the rear is avoided, so that secondary traffic accidents are avoided, and the safety is further improved.

Example 6

Unlike embodiment 5, this embodiment further includes, after step S7:

and S8, when the vision of the front windshield is judged to be normal, the road image display and the double flashing lamps of the road section in front of the vehicle are turned off.

By setting the step, the intelligent degree of the system is further improved.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention.