Inflatable river tubes is portable and durable
PD Toys plastic Co., Ltd is OEM & ODM manufacturer of inflatable products in the mainland of China with more 17 years of manufacturing experience. products ranges are Inflatable Toys, inflatable pools, inflatable pool floats, towable tubes, Air Furniture and Promotional Items etc. total have more than 1500 employees (4 factories) related to PVC inflatable products.
Operated under ISO 9001:2015 management system, We had passed factory Audit by Walmart, Taret, Disney ect, also passed all necessary certificates and testing such as ICTI, BSCI, SEMTA,Target FA, NBC Universal, FCCA, SGS, CVS Security, GSV, Disney FAMA ect. We have our own PVC raw materials manufacturing company, all the PVC we produced are compliance with European EN71, American ASTM standard and NON PHTHALATE (6P) standard.
Inflatable River Tube,River Run,River Float Tubes,Lazy River Water Park P&D Plastic Manufacture Co., Ltd , https://www.jminflatablepool.com
First, the rain sensor works:
Most rain sensors use optical systems consisting of light emitting diodes (LEDs), light receiving diodes (LRDs), ambient sensors, electronic control units (ECUs), and several lenses.
The light emitted by the LED is reflected at the total reflection angle on the outer surface of the windshield, and its angle must be between 420 (glass-air) and 630 (glass-water). If you say upstream in the windshield, some of the light will double out, and this will cause the current from the LRD to decrease. The current is evaluated by electrons. The light reflected from the LED to the windshield of the LRD is called the sensor. "Sensitive area". Only when the rain drops into this area can it be detected. In order to have a sensitive and reliable system, there must be a good ratio between the windshield area and the sensitive area.
Second, the car wiper system car windshield wiper system consists of rain sensor, wiper motor, lever switches, relays and ECU composition. The rain sensor is mounted on the windshield. When detecting rain in the sweeping area, the wiper moves in a way that allows the driver to always have a good view. There are two different systems.
1. Independent Rainwater System: In this system, the rain sensor is directly connected to the wiper lever switch, wiper motor relay and wiper motor stop signal.
2. Network Rain Sensor: In this system, a rain sensor is connected to the bus, which receives all information over the network and sends all commands.
After the driver opens the system, the rain sensor controls all the sweeping actions and it will command a single wiper to sweep at a low speed or sweep it out at a high speed. Because each driver responds differently to the wiper system, the sensitivity setting allows the system to meet the different needs of the driver. Bosch's new wiper motor continuously sweeps at constant speeds.
Third, the signal evaluation 1, transmitter transmitter consists of analog-digital converter (DAC) and power supply. The analog voltage control of the DAC determines the intensity of light emitted by the LED. In general, 2 to 4 LEDs are used. The current regulation of the emitter is very important because the effectiveness of the light conversion is very variable and there is a temperature gradient. In general, in LEDs, light is emitted in a pulsed manner to reduce losses and increase current. Another reason for using a wide range of emitter currents is that the emission of light through the windshield is not well regulated and has a wide tolerance range. Typical windshields are 4 to 6 mm thick and have a specific emission level for IR normal to the surface. Different suppliers have different upper and lower limits.
2. The receiver receiver has several LRDs, current-to-voltage converters, filters for clearing or low-frequency offsets, amplifiers, and ADCs. It also typically includes a microcontroller. The LRD microcontroller is controlled by the microcontroller on and off. If there is disturbing light, LRD will be turned off. The wide range of emissions is the reason for using variable current-voltage conversion to ensure that the rest of the receiver system has good conditions. After conversion, it is fortunate to be filtered. All DC or low-frequency interference will be removed to obtain a pure signal. Interference is usually caused by ambient light. The amount of interference is measured by a microcontroller to determine whether the light path is satisfactory or saturated by sunlight and gives an indication of signal accuracy. The filtered signal is amplified and converted by the ADC.
3. The microcontroller microcontroller controls the entire system and evaluates the signal. The best working point is evaluated before the measurement is performed. Tested with the same test. The conversion ratio in the receiver is least desirable for having a saturated signal in the ADC with the maximum emission current. After the emission current is measured, it generates a signal in the receiver. It is defined between the upper and lower limits. The upper limit is determined by the saturation effect and not by the accuracy of the ADC. The sensor starts working at the operating point. Interference and signal are constantly measured and evaluated. The gradient of the received signal versus time is used by the rule system to evaluate the correct sweep strategy, and the surrounding light is measured by an additional sensor to detect day or night conditions. In the evening, because the water droplets have a greater impact on visibility, especially if there are bright headlights of other vehicles, sensitivity increases.
4. Cleaning modes Different cleaning modes are used to optimize the performance of all rain conditions. The rain speed pattern for rain density is shown in the figure.
1. Direct Mode In direct mode, there is a single wiping action with a low wiper speed. This is the most basic operating state when the automatic mode is opened and when the system detects a dry windshield. From this state, each wipe event directly triggers a single wipe motion. During the wiping process, the system decides to stop at a low speed, continue wiping, or switch to high-speed wiping.
2. Intermittent mode This mode is for raining situations and runs a single wipe at a low speed. Every few seconds, the sensor detects raindrops, and the time between two rains determines the interval between two single wipes. At the end of each interval, time will be recalculated, the more rain, the shorter the interval, and vice versa. In the calculation, the previous interval will be taken into account to achieve a harmonious state. Otherwise "neurological behavior" will annoy motorists. If the calculated interval is longer than the maximum interval, the system goes to direct mode. In each wiping cycle, the sensor checks to decide if it is to be converted or to continue wiping.
3. Continuous wiping In the wiping cycle, the number of rains will be calculated and the size of the raindrops will be evaluated, which is used to obtain information on rain intensity. Based on this strength, rain sensors produce low speeds, high speeds, or specific wipe speeds (eg, 50 r/min). Dynamic lag, which relies on this event in the final cycle, will prevent the system from quickly changing from one speed to another. A time reference using the wiper motor stop signal ensures correct operation of all wiper motors under all conditions. If the motor is wiped at a low speed, the detection time is reduced and the critical value between low and high speeds is automatically increased. The rain sensor mode always reduces the speed from high speed to low speed before stopping to prevent the wiper from generating mechanical stress.
Application of rain sensor on car
Keywords: car; rain sensor If the car has a rain sensor, the driver does not have to adjust the wiper settings to quickly stop the blade movement or get a better perspective. When driving on a wet road, the driver does not need to open the wiper manually, so the driver can concentrate on driving. If an additional "auxiliary headlight switch" is installed, the lights will turn on in dim overtime conditions without wasting fuel due to the headlights being on. Most of the current models use a single-motor driven wiper system. The advantages of this system are self-evident, the use of linkage to drive two wipers, the cost is relatively low. However, the phenomenon of wiper noise and unsmooth brushing in rain and snow still occur from time to time.