CN115339415A - Automobile rainfall sensor and safety control method of wiper control device - Google Patents
Automobile rainfall sensor and safety control method of wiper control device Download PDFInfo
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- CN115339415A CN115339415A CN202210258644.5A CN202210258644A CN115339415A CN 115339415 A CN115339415 A CN 115339415A CN 202210258644 A CN202210258644 A CN 202210258644A CN 115339415 A CN115339415 A CN 115339415A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
- B60S1/00—Cleaning of vehicles
- B60S1/02—Cleaning windscreens, windows or optical devices
- B60S1/04—Wipers or the like, e.g. scrapers
- B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
- B60S1/08—Wipers or the like, e.g. scrapers characterised by the drive electrically driven
- B60S1/0818—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like
- B60S1/0822—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like characterized by the arrangement or type of detection means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
- B60S1/00—Cleaning of vehicles
- B60S1/02—Cleaning windscreens, windows or optical devices
- B60S1/04—Wipers or the like, e.g. scrapers
- B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
- B60S1/08—Wipers or the like, e.g. scrapers characterised by the drive electrically driven
- B60S1/0818—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like
- B60S1/0822—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like characterized by the arrangement or type of detection means
- B60S1/0859—Other types of detection of rain, e.g. by measuring friction or rain drop impact
Abstract
The invention relates to a high-precision automobile rainfall sensor and a safety control method of a windscreen wiper control device, which can effectively improve the driving safety, wherein the windscreen wiper control device comprises a raindrop sensor, the raindrop sensor comprises a base, the outer surface of the base is provided with a plurality of fan-shaped vertical plates, and the fan-shaped transverse plates divide the outer surface of the base into a plurality of mutually independent unit spherical surfaces; the two conductive plates on two sides of one insulating plate have opposite polarities, and the voltage difference between the conductive plates on two sides of the spherical surface of a single unit is kept; the raindrop sensor has high measurement precision and strong environmental adaptability, can measure the rainfall and the incident angle of rainwater, adjusts the actual wiping speed of the windscreen wiper according to the rainfall and the incident angle of the rainwater, and effectively improves the psychological security of a driver; the actual scraping speed of the windscreen wiper can be adjusted respectively under the states of accelerated running, ramp running and steering running according to different running states of the automobile, and driving safety is improved.
Description
The application has the following application numbers: 201710268990.0, filing date: 2017-04-24, the patent name "a control device and a control method for automobile windscreen wipers", and the patent application thereof.
Technical Field
The invention relates to the technical field of automobile windscreen wiper equipment, in particular to an automobile rainfall sensor and a windscreen wiper control device safety control method.
Background
Automatic windshield wiper systems, which are important components of active safety systems for automobiles, have been adopted by more and more middle-high-grade automobiles (including front windshields, rear windows, headlights, side rearview mirrors, and the like). The most important component in an automatic wiper system is a raindrop sensor, and the precision and accuracy of the raindrop sensor directly affect the judgment of the rain amount and the subsequent control mode of the wiper device.
The existing raindrop sensing technology can be divided into a built-in type and an external type according to the installation form, the external type is to install a sensor on the outer surface of a windshield glass, such as the upper surface of an engine cover, the vicinity of a front bumper of an automobile and the like, and the known external raindrop sensor is divided into a photoelectric type, an inductive type and a vibration type according to the working principle. The built-in raindrop sensor is usually installed on the inner surface of automobile glass, a non-contact detection technology is required to be adopted, the currently mainstream built-in raindrop sensor is photoelectric, but the detection of the photoelectric raindrop sensor is easily influenced by factors such as external light, glass light transmittance, glass thickness and expansion degree, the stability of the photoelectric raindrop sensor is limited, and the photoelectric raindrop sensor has high requirements on installation process and installation precision, so that the manufacturing cost is high.
Another type of raindrop sensor in the prior art is a capacitive sensor, for example, a dual-coupling detection circuit related in patent CN201010147175.7, the circuit includes a sensing electrode, a mutual coupling electrode coupled to the sensing electrode, a first driving signal generating unit for driving the mutual coupling electrode, an auto-coupling electrode electrically connected to the sensing electrode through a resistor or an equivalent resistor and driven at different time periods with the mutual coupling electrode, a second driving signal generating unit for driving the auto-coupling electrode, and an AD detection channel for receiving a detection signal input by the sensing electrode. The technology can achieve the purpose of effectively distinguishing rainwater from hands or other grounding conductors through a simple detection circuit.
However, when the rainfall is large, the rainwater can be uniformly covered on the windshield to form a water film with a certain thickness, the rainfall can only be measured through the thickness change of the rainwater attached to the surface of the windshield, and if the thickness change of the rainwater cannot be measured, the action speed of the automatic windshield wiper system is slowed, so that the rain brushing effect is influenced. The photoelectric raindrop sensor works on the principle that the refractive index of light is changed, and the refractive index is only related to the material characteristic of an incident surface and is not related to the thickness of the material, so that the photoelectric raindrop sensor cannot reflect the thickness change of rainwater.
Inductive or capacitive sensors measure the change in the distance between electrodes, the area of electrodes or the dielectric constant of electrodes, as described in CN201210599412.2 for rain detection on windshields, by using piezoelectric means to determine the sensor value, and the sensor determines the magnitude of rain by detecting the vibration of the windshield body, which changes according to the degree of wetting or rain drops falling on the windshield (1). However, when the windshield is stained with foreign matters such as sludge, leaves, insects, etc., the measurement accuracy of such sensors is greatly reduced, and if a new windshield is replaced, the detection system needs to be re-calibrated, resulting in an increase in workload.
The raindrop detection devices have the problem of low measurement precision, and have the following defects: items detected by the raindrop sensor only include the rainfall of raindrops falling on a windshield and the rain removing effect after the wiper is swept, but in the actual driving process, the sweeping frequency of the wiper is not only dependent on the rainfall, but also related to the psychological feeling of a driver and the driving state of the vehicle.
It is known from relevant psychological experiments that the faster the vehicle is, the faster the wiper wiping speed desired by the driver increases, in the case of the same amount of rain detected by the rain sensor. When raindrops fall, the angle between the raindrops and the windshield can also affect the mind of a driver; when the included angle between the rain drops and the windshield is close to 0 degree or 180 degrees when the rain drops fall, the visual speed of the driver for seeing the rain drops is low, and when the included angle between the rain drops and the windshield is close to 90 degrees when the rain drops fall, the visual speed of the driver for seeing the rain drops is high, at the moment, the driver hopes to increase the scraping speed of the windscreen wiper for safety, and if the scraping speed of the windscreen wiper is not changed, the driver can generate certain fear feeling, so that the driver is not concentrated, and the driving danger in rainy days is increased;
when a driver drives straight on a straight road, the desired wiping speed of the wiper blade is within a normal range, and when the automobile goes up or down a slope or turns, the desired wiping speed of the wiper blade is changed, so that the wiping speed of the wiper blade needs to be changed in real time according to the driving state of the automobile.
As can be seen from the above description, in order to improve the rainfall detection accuracy and to take into account the influence of the driving state of the vehicle and the driver's mind, it is necessary to design a novel wiper control device with high detection accuracy and to appropriately control the wiper control device so as to improve the driver's safety.
Disclosure of Invention
The invention aims to provide an automobile rainfall sensor and a safety control method of a wiper control device, which have high detection precision and effectively improve the driving safety.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows: the automobile rainfall sensor and the safety control method of the wiper control device are characterized in that the wiper control device used in the control method comprises a wiper, the wiper is connected with a wiper driving motor through a link mechanism, the driving motor is connected with a controller, and the controller is connected with an ECU (electronic control unit); a raindrop sensor is arranged in the boundary area of the outer side surface of the front windshield and the engine cover of the automobile and is connected with the controller in a wired or wireless mode;
the raindrop sensor comprises a hollow base with a certain thickness, the base is installed in the junction area of a front windshield and an engine cover, the base is of a cavity structure formed by rotating a semicircular fan-shaped section around a Y axis and sweeping a specific angle, the bottom of the cavity structure is composed of two baffles which are respectively contacted with the engine cover and the front windshield, and a sealed cavity is formed by the two baffles and the cavity structure; the Y axis is a horizontal cross axis passing through the origin of the base and arranged along the left and right directions of the automobile, and the specific angle is an included angle between the front windshield and the engine cover on the side view of the automobile;
the outer surface of the base is respectively provided with a plurality of fan-shaped vertical plates and fan-shaped transverse plates, the fan-shaped vertical plates are parallel to a vertical surface in the front-back direction of the automobile, and the fan-shaped vertical plates are parallel to each other and arranged at equal intervals; a plurality of fan-shaped transverse plates are arranged at equal angular intervals around the Y axis; the fan-shaped transverse plate divides the fan-shaped vertical plate into a plurality of mutually independent base plates; the fan-shaped vertical plate and the fan-shaped transverse plate divide the outer surface of the base into a plurality of mutually independent unit spherical surfaces;
the base and the fan-shaped transverse plates are made of insulating materials, the vertical plates are of a sandwich structure, the sandwich structure is composed of an insulating plate positioned in the middle and conductive plates on two sides of the insulating plate, a water guide hole pointing to the center of the sphere of the base is formed in the surface of the sphere of the unit, and a pressure release valve is arranged at a port of the water guide hole close to the sphere of the unit; a drain hole is formed in the bottom of the inner cavity of the base, and the outlet of the drain hole is located above the drain groove in the lower edge of the front windshield;
the bottom of the inner cavity of the base is provided with a support, and the anode and the cathode of a storage battery arranged in the support are respectively connected with one current-conducting plate on two sides of an insulating plate, so that the polarities of the two current-conducting plates on two sides of one insulating plate are opposite, and the voltage difference between the current-conducting plates on two sides of the spherical surface of a single unit is kept; a relay switch is arranged between the storage battery and the current-conducting plates and connected with a controller, and a pressure sensor is arranged between the two current-conducting plates on two sides of one unit spherical surface and is in communication connection with the controller.
Preferably, the upper surface of the support is provided with a spherical groove, and a rotatable rotating ball is placed in the spherical groove; a plurality of horizontally arranged support rings are arranged on the outer surface of the upper half part of the rotating ball along the vertical axis direction of the rotating ball, and a plurality of guide vanes are arranged on the support rings;
the rotating ball, the support ring and the guide vane are made of insulating materials; the surface of the groove of the support is provided with a plurality of pairs of permanent magnets; a plurality of metal strips are arranged on the lower side of the inner portion of the rotating ball and are connected with a storage battery through wires.
Preferably, the ECU is also connected with a three-axis acceleration sensor, a steering wheel angle sensor, a vehicle speed sensor and a gradient sensor which are arranged at corresponding positions of the automobile.
According to the control method of the automobile wiper control device, the control method comprises the following steps: initializing, measuring parameters and adjusting speed;
the initialization steps are as follows: after an automobile ignition switch is started, an ECU sends an initialization command to a controller, the controller controls a relay switch connected with a storage battery to electrify a conductive plate, a spherical coordinate system and a rectangular coordinate system are respectively established by taking the spherical center of a base as an origin, in the rectangular coordinate system, an XY plane is parallel to a plane where an automobile chassis is located, an XZ plane is arranged along the front and back directions of an automobile and is vertical to the XY plane, and a YZ plane is respectively vertical to the XY plane and the XZ plane; the ECU stores spherical coordinates r, theta and phi of the central position of the spherical surface of each unit and receives a voltage value U between two opposite conductive plates in the spherical surface of the unit, which is sent by a pressure sensor;
the parameter measurement steps are as follows: when raindrops fall on the surface of the unit spherical surface and a water film with a certain thickness is formed on the surface of the unit spherical surface, the voltage value U between two adjacent conductive plates (65) changes, the controller calculates the voltage change value Uv between the two adjacent conductive plates in the unit spherical surface, the Uv value is transmitted to the ECU, the ECU marks the central point of the unit spherical surface with the maximum Uv value as a reference point, and a connecting line between the reference point and the spherical center of the base is marked as an incident line of the raindrops; the ECU extracts spherical coordinates r, theta and phi at the reference point; the theta angle is an angle between the projection of the incident raindrop ray in the XY plane and the XZ plane, 0 degree of the theta angle is coincident with the X axis, the phi angle is an angle between the incident raindrop ray and the XY plane, and 0 degree of the phi angle is parallel to the XY plane;
the speed adjusting step comprises the following steps: the ECU (4) adjusts the initial wiping speed V of the windscreen wiper (1) according to the rainfall and the maximum Uv value 1 The greater the rainfall, V 1 The larger the maximum Uv, the larger V 1 The larger; the ECU (4) adjusts the psychotropic correction speed V of the windscreen wiper (1) according to theta and phi 2 Angle theta is close to 0 DEG, V 2 Increase theta away from 0 DEG, V 2 Decrease; phi angle is near 45 DEG, V 2 Increasing phi angle away from 45 DEG and V 2 Decrease; actual wiping speed V of windscreen wiper 3 ＝V 1 +V 2 ；
In the parameter measuring step, a three-axis acceleration sensor (31) measures the longitudinal acceleration Ax and the transverse acceleration Ay of the automobile, and a vehicle speed sensor (33) measures the speed V of the automobile 0 ；
In the speed adjustment step, an ECU (4) calculates an acceleration correction coefficient A according to Ax and Ay 0 ，A 0 Calculated according to the following formula:
actual wiping speed V of windscreen wiper 3 Calculated according to the following formula:
V 3 ＝V 1 +V 2 +C 1 (A 0 ×V 0 )
said C 1 Is a positive constant.
Preferably, in the parameter measuring step, the gradient sensor measures the gradient inclination angle alpha between the plane where the automobile chassis is located and the horizontal plane 2 (ii) a In the speed regulation step, the ECU regulates the speed according to alpha 2 Adjusting actual wiping speed V of windscreen wiper 3 When the automobile is in an uphill state, alpha 2 The larger, V 3 The smaller the vehicle is in a downhill state, alpha 2 The larger, V 3 The larger.
Preferably, in the parameter measuring step, the steering wheel angle sensor measures a steering angle α of the vehicle 1 (ii) a In the speed regulation step, the ECU regulates the speed according to alpha 1 Adjusting actual wiping speed V of windscreen wiper 3 ，α 1 The larger, V 3 The smaller.
The invention has the following beneficial effects: the raindrop sensor is initialized before each measurement, and if dust or impurities are adhered to the surface of the raindrop sensor, the measurement precision of the raindrop sensor is not influenced, the rainfall measurement precision is high, and the environmental adaptability is strong; the rain drop sensor can measure the rainfall and the incident angle of rainwater, the actual scraping and sweeping speed of the windscreen wiper can be adjusted according to the rainfall and the incident angle of the rainwater, and the psychological safety of a driver is effectively improved. The actual scraping speed of the windscreen wiper can be adjusted respectively under the states of accelerated running, ramp running and steering running according to different running states of the automobile, and driving safety is improved.
Drawings
FIG. 1 is a schematic side view of an automobile;
fig. 2 is a schematic circuit diagram of the wiper control apparatus;
FIG. 3 is a schematic isometric view of a raindrop sensor structure;
FIG. 4 isbase:Sub>A cross-sectional view A-A of FIG. 3;
FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4;
FIG. 6 is a schematic diagram showing voltage difference between two sides of a unit spherical shell;
fig. 7 is a schematic diagram of a rectangular coordinate system parameter and a spherical coordinate system.
Detailed Description
The terms "X-axis", "Y-axis", "Z-axis", "XY-plane", "YZ-plane", "ZX-plane" and "horizontal plane" used in this application are all words used to better describe the structure and position of the control device, and do not limit the scope of the technical solution in this application in any way.
As shown in fig. 1-6, the safety control method for the automobile rainfall sensor and the wiper control device uses a wiper control device comprising a wiper 1, the wiper 1 is connected with a wiper driving motor 2 through a link mechanism, the driving motor 2 is connected with a controller 3, and the controller 3 is connected with an ECU 4; the link mechanism can be a four-link or multi-link mechanism, and the driving motor 2 can be a permanent magnet type direct current motor, a stepping motor or other motors with higher control precision; the controller 3 can be a central processing unit chip with a memory or a singlechip with a memory; the driving motor 2 can be controlled to move by a program stored in the controller 3, the driving motor 2 drives the connecting rod mechanism to move, the connecting rod mechanism drives the framework of the windscreen wiper 1 to do reciprocating rotation movement within a certain angle, and a scraping strip arranged on the framework of the windscreen wiper 1 scrapes and sweeps front windscreen or rear windscreen.
In order to detect the rainfall, a raindrop sensor 5 is arranged in the boundary area of the outer side surface of the front windshield and the engine hood of the automobile, and the raindrop sensor 5 is connected with the controller 3 in a wired or wireless mode;
the raindrop sensor 5 comprises a hollow base 6 with a certain thickness, the base 6 is installed in the junction area of a front windshield 7 and an engine cover 8, the base 6 is a cavity structure formed by rotating a semicircular fan-shaped section around a Y axis and sweeping a specific angle, the bottom of the cavity structure is composed of two baffles which are respectively contacted with the engine cover 7 and the front windshield 8, and a sealed cavity is formed by the two baffles and the cavity structure; the Y axis is a horizontal cross axis passing through the origin of the base 6 and arranged along the left and right directions of the automobile, and the specific angle is an included angle between the front windshield 7 and the engine cover 8 on the side view of the automobile;
the outer surface of the base 6 is respectively provided with a plurality of fan-shaped vertical plates 61 and fan-shaped transverse plates 62, the fan-shaped vertical plates 61 are parallel to a vertical surface along the front and back direction of the automobile, namely parallel to an XZ surface, and the fan-shaped vertical plates 61 are mutually parallel and arranged at equal intervals; a plurality of fan-shaped transverse plates 62 are arranged at equal angular intervals around the Y axis; the fan-shaped transverse plates 62 divide the fan-shaped vertical plate 61 into a plurality of mutually independent base plates; the fan-shaped vertical plate 61 and the fan-shaped transverse plate 62 divide the outer surface of the base 6 into a plurality of mutually independent unit spherical surfaces 63;
the base 6 and the fan-shaped transverse plate 62 are made of insulating materials, which can be rubber insulating materials or plastic insulating materials; the fan-shaped vertical plate 61 is of a sandwich structure, namely the fan-shaped vertical plate 61 is divided into a plurality of base plates by a plurality of fan-shaped transverse plates 62, each base plate is of a sandwich structure, the sandwich structure of the base plates is composed of an insulating plate 64 positioned in the middle and conductive plates 65 on two sides of the insulating plate 64, a water guide hole 66 pointing to the spherical center of the base 6 is arranged on the surface of the unit spherical surface 63, and a pressure release valve 67 is arranged at a port of the water guide hole 66 close to the unit spherical surface 63; a drain hole 69 is formed in the bottom of the inner cavity of the base 6, and the outlet of the drain hole 69 is positioned above a drain groove at the lower edge of the front windshield;
the bottom of the inner cavity of the base 6 is provided with a support 7, the anode and the cathode of a storage battery 76 arranged in the support 7 are respectively connected with one conductive plate 65 on two sides of an insulating plate 64, so that the two conductive plates 65 on two sides of one insulating plate 64 have opposite polarities, and the voltage difference between the conductive plates 65 on two sides of a single unit spherical surface 63 is kept; a relay switch is arranged between the storage battery 76 and the conductive plates 65 and is connected with the controller 3, a pressure sensor 68 is arranged between the two conductive plates 65 on two sides of one unit spherical surface 63, and the pressure sensor 68 is in communication connection with the controller 3.
In order to improve the reliability of the raindrop sensor 5, effectively prolong the working time of the raindrop sensor and prolong the service life of the raindrop sensor, the raindrop sensor is provided with a self-generating structure in a better embodiment, and the self-generating structure comprises a rotating ball 71 arranged in a spherical groove formed in the upper surface of a support 7; a plurality of horizontally placed support rings 72 are arranged on the outer surface of the upper half part of the rotating ball 71 along the vertical axis direction of the rotating ball, and a plurality of guide vanes 73 are arranged on the support rings 72; the rotating ball 71, the support ring 72 and the guide vanes 73 are made of insulating materials; a plurality of pairs of permanent magnets are arranged on the surface of the groove of the support 7; a plurality of metal strips are arranged on the lower side of the inner part of the rotating ball 71 and are connected with a storage battery 76 through leads.
The operating principle of the raindrop sensor 5 is as follows: when raining, rainwater jets into a plurality of unit sphere 63, rainwater forms a water film on the surface of unit sphere 63, the thickness of the water film is different, then the voltage difference between the current conducting plates 65 on the two sides of unit sphere 63 changes, ECU4 collects the voltage difference change value Uv of a plurality of unit sphere 63, and the area of unit sphere 63 where a plurality of Uv values are projected onto front windshield 8, so that the rainfall of the local area on front windshield 8 can be calculated, and the wiping speed of the wiper is controlled according to the rainfall.
Because a certain angle exists between the rainwater and the automobile, the rainfall received by each unit spherical surface 63 is different, if the voltage difference value of one unit spherical surface 63 changes quickly, the rainfall entering the unit spherical surface 63 is more, and further, the connecting line between the center point of the unit spherical surface 63 and the center of the base 6 can be deduced to be the incident direction of the rainwater, so that the incident angle between the rainwater and the front windshield can be obtained; according to the rainfall and the incident angle of the rainwater, the wiping speed of the windscreen wiper is adjusted, the wiping speed of the windscreen wiper is higher when the rainfall is higher, the angle between the incident angle of the rainwater and the front windshield is closer to 90 degrees, and the wiping speed of the windscreen wiper is increased when the visual rainwater speed in eyes of a driver is higher, so that the psychological safety of the driver is improved.
When the rainfall gathered in the unit spherical surface 63 exceeds a certain value, the pressure release valve 67 is opened, the rainwater enters the inner cavity of the base 6 along the water guide hole 66 and washes the guide vanes 73, the guide vanes 73 drive the rotary ball 71 to rotate in the groove of the support 7, at the moment, the rotary ball 71 is a micro generator, the metal strip arranged in the rotary ball 71 cuts the magnetic field formed by the plurality of permanent magnets so as to generate current on the metal strip, the current enters the storage battery 76 through a lead and is stored, the self-generating function of the raindrop sensor 5 is realized, and the redundant rainwater is discharged through the water discharge hole 69.
According to the control method of any one of the above-mentioned automobile wiper control devices, the control method comprises the following steps: initializing, measuring parameters and adjusting speed;
the initialization steps are as follows: after the ignition switch of the automobile is started, the ECU4 sends an initialization command to the controller 3, the controller 3 controls a relay switch connected with the storage battery 76 to electrify the conductive plate 65, as shown in FIG. 7, a spherical coordinate system and a rectangular coordinate system are respectively established by taking the spherical center of the base 6 as an origin, in the rectangular coordinate system, an XY plane is parallel to a plane where an automobile chassis is located, an XZ plane is arranged along the front-back direction of the automobile and is vertical to the XY plane, and the YZ plane is respectively vertical to the XY plane and the XZ plane; the ECU4 stores the spherical coordinates r, θ, φ of the center position of each unit spherical surface 63, and receives the voltage value U between the two opposing conductive plates 65 in the unit spherical surface 63, which is sent from the pressure sensor 68; the initialization step is carried out when the automobile runs at every time, when the surface of the raindrop sensor is not clean or is stained with dust and impurities, the subsequent parameter measurement cannot be influenced, the adaptability of the raindrop sensor 5 is improved, and the rainfall measurement precision is also improved.
The parameter measurement steps are as follows: when raindrops fall on the surface of the unit spherical surface 63 and a water film with a certain thickness is formed on the surface of the unit spherical surface 63, the voltage difference U between the two adjacent conductive plates 65 changes, the controller 3 calculates the voltage change value Uv between the two adjacent conductive plates 65 in the unit spherical surface 63, transmits the Uv value to the ECU4, the ECU4 collects a plurality of Uv values, and the unit spherical surface 63 where the Uv values are located projects to the area of the front windshield 8, so that the rainfall of the local area on the front windshield 8 is calculated, meanwhile, the central point of the unit spherical surface 63 with the largest Uv value is marked as a reference point, and the connecting line between the reference point and the spherical center of the base 6 is marked as a raindrop incident line; the ECU4 extracts spherical coordinates r, theta and phi at the reference point; the theta angle is an angle between the projection of the raindrop incident line in an XY plane and an XZ plane, 0 degree of the theta angle is coincident with an X axis, namely 0 degree of the theta angle is parallel to a plane where an automobile chassis is located and points to the front of an automobile, the phi angle is an angle between the raindrop incident line and the XY plane, 0 degree of the phi angle is parallel to the XY plane, the phi angle is a positive value when rotating upwards relative to the XY plane, and the phi angle is a negative value when rotating downwards relative to the XY plane;
the speed adjusting step comprises the following steps: the ECU4 adjusts the initial wiping speed V of the windscreen wiper 1 according to the rainfall and the maximum Uv value 1 The greater the rainfall, V 1 The larger, the larger the maximum Uv, V 1 The larger; the ECU4 adjusts the psychotropic correction speed V of the windscreen wiper 1 according to theta and phi 2 Theta angle is close to 0 deg., and the speed of the visual raindrops in the eyes of the driver is increased, then V 2 Increasing; the speed of raindrops in the eyes of the driver with the theta angle away from 0 DEG is increased, then V 2 Decrease; the phi angle is close to 45 degrees, the visual raindrop speed in the eyes of the driver is increased, and then V is 2 Increasing phi angle away from 45 degrees, decreasing visual raindrop speed in driver's eyes, then V 2 Decrease; actual wiping speed V of windscreen wiper 3 ＝V 1 +V 2 ；
In order to adapt to complex environmental conditions such as acceleration driving, slope driving, turning driving and the like, a better embodiment is as follows: the ECU4 is also connected with a three-axis acceleration sensor 31, a steering wheel angle sensor 32, a vehicle speed sensor 33 and a gradient sensor 34 which are arranged at corresponding positions of the automobile.
In the parameter measuring step, the three-axis acceleration sensor 31 measures the longitudinal acceleration Ax and the transverse acceleration Ay of the automobile, and the speed sensor 33 measures the speed V of the automobile 0 ；
In the speed adjustment step, the ECU4 calculates an acceleration correction coefficient A based on Ax and Ay 0 Said A is 0 Calculated according to the following formula:
actual wiping speed V of windscreen wiper 3 Calculated according to the following formula:
V 3 ＝V 1 +V 2 +C 1 (A 0 ×V 0 )
said C 1 The constant is a positive constant, and when the automobile is in a condition of rapid acceleration or rapid deceleration, the actual wiping speed V of the windscreen wiper 3 The amount of the fuel is properly increased, so that the feeling of danger to the driver in mind in the acceleration state is reduced, and the driving safety is improved.
In the parameter measuring step, the gradient sensor 34 measures the gradient inclination angle alpha between the plane where the automobile chassis is located and the horizontal plane 2 (ii) a In the speed regulation step, the ECU4 regulates the speed according to alpha 2 Adjusting actual wiping speed V of windscreen wiper 3 When the automobile is in an uphill state, the influence of the windscreen wiper on shielding is reduced for better seeing the road in front clearly, and the larger the uphill gradient is, the larger the V is 3 Should be smaller, which is advantageous for the driver to have his field of view unaffected by the wiper blade when he is ascending, so alpha 2 The larger, V 3 The smaller; when the automobile is in a downhill state, V is larger when the downhill gradient is larger in order to reduce the psychological danger feeling of the driver 3 Should be larger, therefore α 2 The larger, V 3 The larger. This improves the driving safety of the vehicle in the state of driving on a slope.
In the parameter measuring step, the steering angle sensor 32 measures the steering angle α of the vehicle 1 (ii) a In the speed regulation step, the ECU4 regulates the speed according to alpha 1 Adjusting actual wiping speed V of windscreen wiper 3 The larger the steering angle is, the smaller the wiping speed of the windscreen wiper expected by a driver is, so that the situation of clearly seeing the front when steering is facilitated, and the pair of windscreen wipers is reducedObstruction of line of sight, thus alpha 1 The larger, V 3 The smaller.
Claims (3)
1. The automobile rainfall sensor and the safety control method of the wiper control device are characterized in that the wiper control device used in the control method comprises a wiper (1), the wiper (1) is connected with a wiper driving motor (2) through a link mechanism, the driving motor (2) is connected with a controller (3), and the controller (3) is connected with an ECU (4); a raindrop sensor (5) is arranged in a boundary area of the outer side surface of the front windshield and the engine cover of the automobile, and the raindrop sensor (5) is connected with the controller (3) in a wired or wireless mode;
the raindrop sensor (5) comprises a hollow base (6) with a certain thickness, the base (6) is installed in a junction area of a front windshield (7) and an engine cover (8), the base (6) is of a cavity structure formed after a semicircular fan-shaped section rotates around a Y axis to sweep a specific angle, the bottom of the cavity structure is composed of two baffles which are respectively contacted with the engine cover (7) and the front windshield (8), and a sealed cavity is formed by the two baffles and the cavity structure; the Y axis is a horizontal cross axis passing through the origin of the base (6) and arranged along the left and right directions of the automobile, and the specific angle is an included angle between the front windshield (7) and the engine cover (8) on the side view of the automobile;
the outer surface of the base (6) is respectively provided with a plurality of fan-shaped vertical plates (61) and fan-shaped transverse plates (62), the fan-shaped vertical plates (61) are parallel to a vertical surface in the front-rear direction of the automobile, and the fan-shaped vertical plates (61) are parallel to each other and arranged at equal intervals; a plurality of fan-shaped transverse plates (62) are arranged at equal angular intervals around the Y axis; the fan-shaped transverse plate (62) divides the fan-shaped vertical plate (61) into a plurality of mutually independent base plates; the fan-shaped vertical plate (61) and the fan-shaped transverse plate (62) divide the outer surface of the base (6) into a plurality of mutually independent unit spherical surfaces (63);
the base (6) and the fan-shaped transverse plates (62) are made of insulating materials, the vertical plates (61) are of a sandwich structure, the sandwich structure is composed of an insulating plate (64) positioned in the middle and conductive plates (65) on two sides of the insulating plate (64), a water guide hole (66) pointing to the spherical center of the base (6) is formed in the surface of the unit spherical surface (63), and a pressure release valve (67) is arranged at a port, close to the unit spherical surface (63), of the water guide hole (66); a drain hole (69) is formed in the bottom of the inner cavity of the base (6), and the outlet of the drain hole (69) is located above a drain groove at the lower edge of the front windshield;
the bottom of the inner cavity of the base (6) is provided with a support (7), the positive electrode and the negative electrode of a storage battery (76) arranged in the support (7) are respectively connected with one conductive plate (65) at two sides of the insulating plate (64), so that the polarities of the two conductive plates (65) at two sides of the insulating plate (64) are opposite, and the voltage difference between the conductive plates (65) at two sides of the single unit spherical surface (63) is kept; a relay switch is arranged between the storage battery (76) and the conductive plates (65), the relay switch is connected with the controller (3), a pressure sensor (68) is arranged between the two conductive plates (65) on two sides of one unit spherical surface (63), and the pressure sensor (68) is in communication connection with the controller (3);
the ECU (4) is also connected with a triaxial acceleration sensor (31), a steering wheel angle sensor (32), a vehicle speed sensor (33) and a gradient sensor (34) which are arranged at corresponding positions of the automobile
The method is characterized in that: the control method comprises the following steps: initializing, measuring parameters and adjusting speed;
the initialization steps are as follows: after an automobile ignition switch is started, an ECU (4) sends an initialization command to a controller (3), the controller (3) controls a relay switch connected with a storage battery (76) to electrify a conductive plate (65), a spherical coordinate system and a rectangular coordinate system are respectively established by taking the spherical center of a base (6) as an origin, in the rectangular coordinate system, an XY plane is parallel to a plane where an automobile chassis is located, an XZ plane is arranged along the front and rear directions of an automobile and is vertical to the XY plane, and a YZ plane is respectively vertical to the XY plane and the XZ plane; the ECU (4) stores spherical coordinates r, theta and phi of the central position of each unit spherical surface (63) and receives a voltage value U between two opposite conductive plates (65) in the unit spherical surface (63) sent by a pressure sensor (68);
the parameter measurement steps are as follows: when raindrops fall on the surface of the unit spherical surface (63) and a water film with a certain thickness is formed on the surface of the unit spherical surface, the voltage value U between two adjacent conductive plates (65) changes, the controller (3) calculates the voltage change value Uv between the two adjacent conductive plates (65) in the unit spherical surface (63), the Uv value is transmitted to the ECU (4), the ECU (4) marks the central point of the unit spherical surface (63) with the maximum Uv value as a reference point, and a connecting line between the reference point and the spherical center of the base (6) is marked as a raindrop incident line; the ECU (4) extracts spherical coordinates r, theta and phi at the reference point; the theta angle is an angle between the projection of the incident ray of the raindrop in the XY plane and the XZ plane, 0 degree of the theta angle is coincident with the X axis, the phi angle is an angle between the incident ray of the raindrop and the XY plane, and 0 degree of the phi angle is parallel to the XY plane;
the speed adjusting step comprises the following steps: the ECU (4) adjusts the initial wiping speed V of the windscreen wiper (1) according to the rainfall and the maximum Uv value 1 The greater the rainfall, V 1 The larger, the larger the maximum Uv, V 1 The larger; the ECU (4) adjusts the psychotropic correction speed V of the windscreen wiper (1) according to theta and phi 2 Angle theta is close to 0 DEG, V 2 Increase theta away from 0 DEG, V 2 Decrease; phi angle is near 45 DEG, V 2 Increasing phi angle away from 45 DEG and V 2 Decrease; actual wiping speed V of windscreen wiper 3 ＝V 1 +V 2 ；
In the parameter measuring step, a three-axis acceleration sensor (31) measures the longitudinal acceleration Ax and the transverse acceleration Ay of the automobile, and a vehicle speed sensor (33) measures the speed V of the automobile 0 ；
In the speed adjustment step, an ECU (4) calculates an acceleration correction coefficient A according to Ax and Ay 0 ，A 0 Calculated according to the following formula:
actual wiping speed V of windscreen wiper 3 Calculated according to the following formula:
V 3 ＝V 1 +V 2 +C 1 (A 0 ×V 0 )
said C 1 Is a positive constant.
2. The automobile rainfall sensor and wiper control device safety control method according to claim 1, wherein: said parametersIn the measuring step, a gradient sensor (34) measures a gradient inclination angle alpha between a plane where the automobile chassis is located and a horizontal plane 2 (ii) a In the speed adjusting step, the ECU (4) adjusts the speed according to alpha 2 Adjusting actual wiping speed V of windscreen wiper 3 When the automobile is in an uphill state, alpha 2 The larger, V 3 The smaller the vehicle is in a downhill state, alpha 2 The larger, V 3 The larger.
3. The automobile rainfall sensor and wiper control device safety control method according to claim 2, wherein: in the parameter measuring step, a steering wheel angle sensor (32) measures a steering angle alpha of the automobile 1 (ii) a In the speed adjusting step, the ECU (4) adjusts the speed according to alpha 1 Adjusting actual wiping speed V of windscreen wiper 3 ，α 1 The larger, V 3 The smaller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210258644.5A CN115339415A (en) | 2017-04-24 | 2017-04-24 | Automobile rainfall sensor and safety control method of wiper control device |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710268990.0A CN107054300B (en) | 2017-04-24 | 2017-04-24 | Automobile wiper control device and control method |
| CN202210258644.5A CN115339415A (en) | 2017-04-24 | 2017-04-24 | Automobile rainfall sensor and safety control method of wiper control device |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710268990.0A Division CN107054300B (en) | 2017-04-24 | 2017-04-24 | Automobile wiper control device and control method |
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| CN115339415A true CN115339415A (en) | 2022-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210258644.5A Withdrawn CN115339415A (en) | 2017-04-24 | 2017-04-24 | Automobile rainfall sensor and safety control method of wiper control device |
| CN201710268990.0A Active CN107054300B (en) | 2017-04-24 | 2017-04-24 | Automobile wiper control device and control method |
| CN202210258639.4A Withdrawn CN115339414A (en) | 2017-04-24 | 2017-04-24 | Novel high-precision rainfall sensor for automobile |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710268990.0A Active CN107054300B (en) | 2017-04-24 | 2017-04-24 | Automobile wiper control device and control method |
| CN202210258639.4A Withdrawn CN115339414A (en) | 2017-04-24 | 2017-04-24 | Novel high-precision rainfall sensor for automobile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111301348B (en) * | 2019-12-31 | 2022-04-08 | 厦门雅迅网络股份有限公司 | Windshield wiper control method based on electronic horizon, terminal device and storage medium |
| CN111169368B (en) * | 2020-01-16 | 2021-10-22 | 深圳市得盛电子有限公司 | Intelligent control device for automobile light |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0815449A (en) * | 1994-04-26 | 1996-01-19 | Omron Corp | Rain drop sensor and rain-drop measuring device using the sensor as well as wiper driving device using the measuring device |
| DE10049401A1 (en) * | 2000-10-05 | 2002-04-25 | Hsm Gmbh | humidity sensor |
| DE10127684A1 (en) * | 2001-06-01 | 2002-12-05 | Bosch Gmbh Robert | Rain sensor with at least one heating element and method for heating sensor with heater initiated by temperature sensor and voltage supply modulated by microprocessor |
| DE10150606A1 (en) * | 2001-10-12 | 2003-04-17 | Bayerische Motoren Werke Ag | Detection of misting of a motor vehicle windscreen due to condensation, whereby an conducting disks are combined to form electrodes and arranged around the screen circumference so that their capacitances can be monitored |
| CN101920691B (en) * | 2010-09-10 | 2012-01-25 | 王洪紫龙 | Wiper protection device and control method thereof |
| CN102069776A (en) * | 2010-12-13 | 2011-05-25 | 吴清芳 | Induction frameless vacuum/electrostatic suction cup type windscreen wiper |
| CN205493727U (en) * | 2016-03-11 | 2016-08-24 | 上海欧柏森环境工程管理有限公司 | Industrial electric scrape diji |
-
2017
- 2017-04-24 CN CN202210258644.5A patent/CN115339415A/en not_active Withdrawn
- 2017-04-24 CN CN201710268990.0A patent/CN107054300B/en active Active
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| CN107054300A (en) | 2017-08-18 |
| CN115339414A (en) | 2022-11-15 |
| CN107054300B (en) | 2022-12-16 |
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