Control method and control system for vehicle glass defogging, and vehicle

Abstract

Disclosed are a control method and control system for vehicle glass defogging, and a vehicle. The control method for vehicle glass defogging comprises the following steps: acquiring data of in-vehicle temperature and humidity and out-of-vehicle temperature and humidity, and calculating to obtain in-vehicle and out-of-vehicle dew point temperature values so as to determine a vehicle dew point temperature value; and, on the basis of a difference value between a real-time glass temperature value and a vehicle dew point temperature, determining a duty ratio output value for controlling the operation of a heating wire, and outputting a preset heating frequency to drive the heating wire to heat glass. On the basis of the in-vehicle and out-of-vehicle temperatures and humidities, a system controller controls a heating controller to drive the heating wire to perform heating at a certain duty ratio and heating frequency, so as to achieve automatic adjustment to the power and heating time of the heating wire without manual intervention, which is intelligent and saves energy.

Description

Vehicle glass defogging control method, control system and vehicle Technical Field

[0001] The present invention relates to the technical field of automobile control, and in particular to a vehicle glass defogging control method, a control system and a vehicle. Background Art

[0002] During rainy summers and winters, vehicle windows tend to fog up easily. This requires a defrost machine to blow hot air to defog the windshield. Currently, defoggering car windshields involves blowing dehumidified air or heated air through a heater onto the glass. This method requires the air conditioner to be turned on, but the defrosting effect is not very good. Especially in winter, even when hot air is blown inside the car to defog the glass, fogging still occurs. Manually adjusting the air volume and temperature is cumbersome and ineffective.

[0003] Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a vehicle glass defogger control method, a control system and a vehicle to solve the above-mentioned problem.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A vehicle glass defogging control method comprises the following steps:

[0007] Acquiring temperature and humidity data inside the vehicle and outside the vehicle and calculating dew point temperature values ​​inside and outside the vehicle, thereby determining a vehicle dew point temperature value, wherein the vehicle dew point temperature value is configured as the larger value of the dew point temperature values ​​inside and outside the vehicle;

[0008] The real-time temperature data of the vehicle glass is obtained, and the duty cycle output value for controlling the operation of the heating wire is determined based on the difference between the real-time temperature value of the glass and the dew point temperature of the vehicle, and a preset heating frequency is output to drive the heating wire to heat the glass.

[0009] Furthermore, the formula for obtaining the dew point temperature values ​​inside and outside the vehicle based on the temperature and humidity data inside and outside the vehicle is: Tdn = Tn - [(100 - Nn) / 5];

[0010] Where Tdn is the dew point temperature, Tn is the temperature, Nn is the humidity, and n represents the position inside and outside the vehicle.

[0011] Furthermore, if the difference between the real-time temperature value of the glass and the dew point temperature of the vehicle is within a preset first interval, the duty cycle output of the heating wire is turned off.

[0012] Furthermore, if the difference between the real-time temperature of the glass and the dew point temperature of the vehicle is within a preset second interval, the duty cycle output value of the heating wire is determined by a first preset formula, wherein the first preset formula is configured as: X = [80 - (|T - Td| / 2) × 80] × 100%;

[0013] Where X is the duty cycle output value, T is the real-time temperature of the glass, and Td is the dew point temperature of the vehicle.

[0014] Furthermore, if the difference between the real-time temperature of the glass and the dew point temperature of the vehicle is within a preset third interval, a second preset formula is used to determine the duty cycle output value of the heating wire, and the second preset formula is configured as: X=MIN{100,90-[(T-Td+1) / 10]×100}×100%;

[0015] Where X is the duty cycle output value, T is the real-time temperature of the glass, and Td is the dew point temperature of the vehicle.

[0016] Furthermore, the steps include:

[0017] Real-time temperature data of the vehicle glass is obtained, and when the real-time temperature data is greater than a first preset value, the duty cycle output of the heating wire is turned off.

[0018] Furthermore, the steps include:

[0019] When controlling the duty cycle output of the heating wire, the operating current flowing through the heating wire is detected in real time to determine whether the heating wire has a fault.

[0020] Furthermore, the step of determining whether the heating wire is faulty includes:

[0021] reading the real-time current flowing through the heating wire;

[0022] determining whether the real-time current is in a preset fourth interval, wherein the fourth interval is configured to be determined by a maximum current value flowing through the heating wire;

[0023] When the real-time current is not in the preset fourth interval, it is determined that the heating wire has a fault based on the duty cycle output value of the heating wire and the preset heating frequency.

[0024] The present invention also provides a vehicle glass defogging control system, which includes:

[0025] A system controller configured to include the vehicle glass defogger control method according to any one of claims 1 to 8;

[0026] A sensor module and a heating controller electrically connected to the system controller; the sensor module is configured to collect temperature and humidity data inside and outside the vehicle and real-time temperature data of the glass; the heating controller is configured to drive the heating wire to heat the glass according to the duty cycle output value and preset heating frequency determined by the system controller.

[0027] The present invention also provides a vehicle, comprising vehicle window glass and the vehicle glass defogger control system as described in claim 9, wherein the vehicle window glass is distributed according to area to form multiple heating areas, each of the heating areas is respectively provided with a heating wire, and the heating wire is configured to heat the glass according to the duty cycle output value and preset heating frequency output by the vehicle glass defogger control system.

[0028] Compared with the prior art, the present invention has at least the following beneficial effects:

[0029] (1) Based on the temperature and humidity inside and outside the vehicle, the system controller controls the heating controller to drive the heating wire to heat at a certain duty cycle and heating frequency, which can automatically adjust the heating wire power and heating time without manual intervention. It is very intelligent and energy-saving;

[0030] (2) Each output port of the heating controller is equipped with a current detection circuit, which can obtain the current value in real time. The heating wire has a certain resistive characteristic. The current detection can be used to determine whether the heating wire is normal. When the current value is greater than the corresponding maximum value, the instrument will alarm for the possible short circuit state of the heating wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic diagram of a vehicle window heating area according to an embodiment of the present invention;

[0032] FIG2 is a schematic diagram of a framework of a vehicle glass defogging control system according to an embodiment of the present invention;

[0033] FIG3 is a flowchart of the steps of a vehicle glass defogging control method according to an embodiment of the present invention;

[0034] FIG4 is a flow chart of determining a duty cycle output value according to an embodiment of the present invention;

[0035] FIG5 is a flow chart of determining whether the heating wire is faulty in an embodiment of the present invention. DETAILED DESCRIPTION

[0036] It should be noted that terms such as "first," "second," and "one" in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0037] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0038] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0039] In this embodiment, as shown in Figures 1 and 2, a vehicle is provided, which includes a vehicle window glass 1 and a vehicle glass defogger control system. The vehicle window glass is distributed according to the area to form four heating areas 2. Each heating area is provided with a heating wire. The heating wire is electrically connected to the vehicle glass defogger control system and is configured to heat the glass according to the duty cycle output value and the preset heating frequency output by the vehicle glass defogger control system to remove the fog on the glass.

[0040] Vehicle glass defogger control system includes:

[0041] A system controller configured to include a vehicle glass defogging control method;

[0042] A sensor module 3 and a heating controller are electrically connected to the system controller. The sensor module 3 is configured to collect temperature and humidity data inside and outside the vehicle, as well as real-time glass temperature data. The heating controller is configured to drive the heating wire to heat the glass based on a duty cycle output value and a preset heating frequency determined by the system controller.

[0043] The sensor module includes a temperature sensor and a humidity sensor. The temperature sensor is used to collect temperature data inside and outside the vehicle and the window glass, while the humidity sensor is used to collect humidity data inside and outside the vehicle.

[0044] In the vehicle glass defogging control method, it can determine the duty cycle output value and heating frequency output value for controlling the operation of the heating wire based on the temperature and humidity data collected by the sensor module. As shown in Figure 3, it includes the following steps:

[0045] S1. Obtaining temperature and humidity data inside and outside the vehicle and calculating dew point temperature values ​​inside and outside the vehicle, thereby determining a vehicle dew point temperature value, wherein the vehicle dew point temperature value is configured as the larger value of the dew point temperature values ​​inside and outside the vehicle;

[0046] S2. Acquire real-time temperature data of the vehicle glass, determine a duty cycle output value for controlling the operation of the heating wire based on the difference between the real-time temperature value of the glass and the dew point temperature of the vehicle, and output a preset heating frequency to drive the heating wire to heat the glass.

[0047] The present invention is based on the temperature and humidity inside and outside the vehicle. The system controller controls the heating controller to drive the heating wire to heat at a certain duty cycle and heating frequency, which can realize automatic adjustment of the heating wire power and heating time without manual intervention. It is very intelligent and energy-saving.

[0048] Furthermore, the formula for obtaining the dew point temperature values ​​inside and outside the vehicle based on the temperature and humidity data inside and outside the vehicle is: Tdn = Tn - [(100 - Nn) / 5];

[0049] Where Tdn is the dew point temperature, Tn is the temperature, Nn is the humidity, and n represents the position inside and outside the vehicle.

[0050] The present invention not only considers the different temperatures inside and outside the vehicle but also the humidity conditions, thereby obtaining the dew point temperatures inside and outside the vehicle according to the formula, and determining the vehicle dew point temperature value Td based on the larger value of the dew point temperatures inside and outside the vehicle.

[0051] After the vehicle dew point temperature value Td is determined, the duty cycle output value of the system controller for controlling the operation of the heating wire is determined according to the difference between the dew point temperature value Td and the real-time temperature value T of the glass.

[0052] As shown in Figure 4, when the difference between the real-time glass temperature value T and the vehicle dew point temperature Td is greater than 2, it means that the glass temperature is high and higher than the temperature inside and outside the vehicle. At this time, the glass will not produce fog, and the duty cycle output of the heating wire needs to be turned off.

[0053] When the difference between the real-time glass temperature value T and the vehicle dew point temperature Td is in the interval [0, 2], it indicates that the glass temperature is not very low, and only a smaller duty cycle output is required to control the operation of the heating wire. Therefore, the duty cycle output value of the heating wire is determined by the first preset formula, which is configured as: X = [80-(|T-Td| / 2)×80]×100%;

[0054] Where X is the duty cycle output value, T is the real-time temperature of the glass, and Td is the dew point temperature of the vehicle.

[0055] When the glass's real-time temperature T is less than the vehicle's dew point temperature Td, it indicates that the glass is too cold and prone to fogging. A heating wire is needed to quickly raise the glass's temperature to eliminate the fog. Therefore, the heating wire's duty cycle output is determined using a second preset formula: X = MIN{100,90-[(T-Td+1) / 10]×100}×100%.

[0056] Where X is the duty cycle output value, T is the real-time temperature of the glass, and Td is the dew point temperature of the vehicle.

[0057] Then, when the heating wire is working, the real-time temperature data of the vehicle glass is obtained in real time. When the real-time temperature data is greater than 50°C, the duty cycle output of the heating wire is turned off.

[0058] The present invention outputs the duty cycle output value for controlling the operation of the heating wire and also outputs the heating frequency of the heating wire to the heating driver through the system controller, thereby clearing the fog that may be generated on the glass.

[0059] When the heating wire heats the glass, each output port of the heating controller is provided with a current detection circuit, which can obtain the current value in real time and determine the working status of the heating wire by detecting the current value.

[0060] As shown in FIG5 , the steps of determining whether the heating wire is faulty include:

[0061] T1, reading the real-time current flowing through the heating wire;

[0062] T2. Determine whether the real-time current is in a preset fourth interval, where the fourth interval is configured to be determined by the maximum current value flowing through the heating wire;

[0063] T3. When the real-time current is not in the preset fourth interval, it is determined that the heating wire is faulty based on the duty cycle output value of the heating wire and the preset heating frequency; when the real-time current is in the preset fourth interval, it indicates that the heating wire is working normally.

[0064] Specifically, after reading the real-time current value An, the system determines whether the duty cycle Xn is output, whether the heating frequency fn is output, and whether the real-time current value is less than 1.1 times the maximum current value. Only when all three conditions are met does the heater wire operate normally. If any one of these conditions is not met, the system further determines whether the duty cycle Xn output is 0 or the heating frequency fn output is 0. If either condition is met, the heater wire is not operating. If both conditions are met, the real-time current value A exceeds the preset value, indicating that the heater wire may be short-circuited. Therefore, upon determining that the heater wire is faulty, the system controller stops outputting the duty cycle and heating frequency.

[0065] Then continue to detect the working status of the next heating wire in the same way until all the heating wires in the four heating areas are detected. When the status of a heating wire is abnormal, the system controller can generate a corresponding alarm signal.

[0066] Since the heating wire has certain resistive characteristics, the present invention can determine whether the electric heating wire is normal through current detection. When the current value is greater than the corresponding maximum value, an alarm is issued for a possible short circuit state of the heating wire.

[0067] In addition, the vehicle glass defogger control system also includes an instrument and a heating switch, both of which are electrically connected to the system controller.

[0068] The heating switch is configured to allow the user to select automatic heating mode, manual heating mode, or off heating mode. In automatic heating mode, the system controller automatically adjusts the operation of the heating wire according to the vehicle's glass defogging control method to heat and defog the glass. In manual heating mode, the duty cycle and heating frequency of the heating wire are controlled according to user manual adjustments.

[0069] In the instrument, it can display the working status of the heating wire in real time, and receive the alarm signal sent by the system controller to show which heating wire has failed, thereby alerting the user.

[0070] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A vehicle glass defogging control method, characterized in that, it includes the steps of: Obtaining the temperature and humidity data inside and outside the vehicle and calculating the dew point temperature values inside and outside the vehicle, and then determining the vehicle dew point temperature value, where the vehicle dew point temperature value is configured to be the larger value among the dew point temperature values inside and outside the vehicle; Obtaining the real-time temperature data of the vehicle glass, determining the duty cycle output value for controlling the heating wire to work based on the difference between the real-time glass temperature value and the vehicle dew point temperature, and outputting a preset heating frequency to drive the heating wire to heat the glass.

2. The vehicle glass defogging control method according to claim 1, characterized in that, The formula for obtaining the dew point temperature values inside and outside the vehicle based on the temperature and humidity data inside and outside the vehicle is: Tdn = Tn - [(100 - Nn) / 5]; where, Tdn is the dew point temperature value, Tn is the temperature value, Nn is the humidity value, and n represents each position inside and outside the vehicle.

3. The vehicle glass defogging control method according to claim 1, characterized in that, When the difference between the real-time glass temperature value and the vehicle dew point temperature is within a preset first interval, the duty cycle output for the heating wire to work is turned off.

4. The vehicle glass defogging control method according to claim 3, characterized in that, When the difference between the real-time glass temperature value and the vehicle dew point temperature is within a preset second interval, the duty cycle output value for the heating wire to work is determined by a first preset formula, and the first preset formula is configured as: X = [80 - (|T - Td| / 2)×80]×100%; where, X is the duty cycle output value, T is the real-time glass temperature value, and Td is the vehicle dew point temperature value.

5. The vehicle glass defogging control method according to claim 4, characterized in that, When the difference between the real-time glass temperature value and the vehicle dew point temperature is within a preset third interval, the duty cycle output value for the heating wire to work is determined by a second preset formula, and the second preset formula is configured as: X = MIN{100, 90 - [(T - Td + 1) / 10]×100}×100%; where, X is the duty cycle output value, T is the real-time glass temperature value, and Td is the vehicle dew point temperature value.

6. The vehicle glass defogging control method according to claim 1, characterized in that, it further includes the steps of: Obtaining the real-time temperature data of the vehicle glass, and when the real-time temperature data is greater than a first preset value, turning off the duty cycle output for the heating wire to work.

7. The vehicle glass defogging control method according to claim 1, characterized in that, it further includes the steps of: When controlling the duty cycle output for the heating wire to work, the working current flowing through the heating wire is detected in real time to determine whether there is a fault in the heating wire.

8. The vehicle glass defogging control method according to claim 7, characterized in that, The steps for determining whether there is a fault in the heating wire include: Reading the real-time current flowing through the heating wire; Judging whether the real-time current is within a preset fourth interval, and the fourth interval is configured to be determined by the maximum current value flowing through the heating wire; When the real-time current is not within a preset fourth interval, it is determined that there is a fault in the heating wire based on the duty cycle output value of the heating wire operation and the preset heating frequency.

9. A vehicle glass defogging control system, characterized in that, it includes: A system controller configured to include the vehicle glass defogging control method according to any one of claims 1-8; A sensor module and a heating controller electrically connected to the system controller; the sensor module is configured to collect the temperature and humidity data inside and outside the vehicle and the real-time glass temperature data; the heating controller is configured to drive the heating wire to heat the glass according to the duty cycle output value determined by the system controller and the preset heating frequency.

10. A vehicle, characterized in that, it includes a window glass and the vehicle glass defogging control system according to claim 9. The window glass is divided into multiple heating areas according to the area, and each of the heating areas is provided with a heating wire, and the heating wire is configured to heat the glass according to the duty cycle output value output by the vehicle glass defogging control system and the preset heating frequency.

Images