WO2021093077A1 - 一种风挡玻璃电加热控制电路、控制方法及系统 - Google Patents

一种风挡玻璃电加热控制电路、控制方法及系统 Download PDF

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Publication number
WO2021093077A1
WO2021093077A1 PCT/CN2019/125375 CN2019125375W WO2021093077A1 WO 2021093077 A1 WO2021093077 A1 WO 2021093077A1 CN 2019125375 W CN2019125375 W CN 2019125375W WO 2021093077 A1 WO2021093077 A1 WO 2021093077A1
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WIPO (PCT)
Prior art keywords
windshield
heating
ambient temperature
command relay
glass
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Application number
PCT/CN2019/125375
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English (en)
French (fr)
Inventor
景美丽
杨志月
魏海洋
马新华
何石磊
冯宝祥
任静
才倩
李玉明
Original Assignee
中车唐山机车车辆有限公司
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Application filed by 中车唐山机车车辆有限公司 filed Critical 中车唐山机车车辆有限公司
Publication of WO2021093077A1 publication Critical patent/WO2021093077A1/zh

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/84—Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields
    • H05B3/845—Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields specially adapted for reflecting surfaces, e.g. bathroom - or rearview mirrors
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/84—Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields

Definitions

  • This application relates to rail vehicle technology, and in particular to a windshield glass electric heating control circuit, control method and system.
  • Electrically heated glass is an optically transparent material that has a certain light transmittance and can be heated after being energized. Its main function is to achieve deicing, defrosting, and defogging in harsh environments under the premise of ensuring that the driver has a good field of vision, so as to provide the driver with a good line of sight to observe signals and road conditions and other information, thereby ensuring driving safety. Electric heating performance is an important index that affects the function, reliability, and life of windshield glass.
  • the traditional control method is to set a switch to control the heating of the glass.
  • the windshield starts to heat.
  • the glass automatically cuts off or switches on the electric heating according to the heating temperature range; when it is set to "Off" In gear, the windshield glass stops heating.
  • the traditional control method only controls the on/off of the electric heating of the windshield glass, and cannot control the temperature range of the glass heating.
  • the embodiments of the present application provide a windshield glass electric heating control circuit, control method and system to solve the above technical problems.
  • a windshield glass electric heating control circuit including: an electric glass control circuit breaker, a windshield heating command relay, a windshield glass overheating protection device, a windshield glass heating switch, and a windshield glass heating
  • the contactor, the electric glass control circuit breaker, the windshield heating command relay, the windshield overheating protection device, the windshield heating switch, and the windshield heating contactor are connected in series in sequence, wherein,
  • the windshield heating command relay When the ambient temperature is lower than the preset temperature threshold, the windshield heating command relay is closed, and the normally open contact of the windshield heating command relay is closed; when the ambient temperature is lower than the preset temperature threshold and the windshield is heated When the switch is turned on, the windshield heating contactor is closed, and the windshield starts to heat;
  • the windshield heating command relay When the ambient temperature is higher than the preset temperature threshold, the windshield heating command relay does not pull in, and the normally open contact of the windshield heating command relay is disconnected; when the ambient temperature is higher than the preset temperature threshold and the windshield When the glass heating switch is turned on, the windshield glass heating contactor is not closed, and the windshield glass is not heated.
  • a windshield glass electric heating control method including:
  • the windshield heating command relay When the ambient temperature is lower than the preset temperature threshold, the windshield heating command relay is controlled to close, and the normally open contact of the windshield heating command relay is closed; when the ambient temperature is lower than the preset temperature threshold and the windshield heating switch is turned on, the windshield The glass heating contactor is closed, and the windshield glass starts to heat up;
  • the control windshield heating command relay When the ambient temperature is higher than the preset temperature threshold, the control windshield heating command relay does not pull in, and the normally open contact of the windshield heating command relay is disconnected; when the ambient temperature is higher than the preset temperature threshold and the windshield heating switch is turned on When the windshield glass heating contactor is not closed, the windshield glass is not heated;
  • the windshield heating command relay is connected in series with the windshield heating control circuit.
  • a windshield electric heating control system including: an air conditioning system, and a windshield electric heating control circuit.
  • the air conditioning system includes an air conditioning unit and a temperature sensor. The sensor is used to monitor the ambient temperature.
  • the air-conditioning system includes a windshield heating command relay, the normally open contact of the windshield heating command relay and the windshield overheating protection device of the windshield electric heating control circuit, and a windshield heating switch Connected in series with the windshield heating contactor;
  • the air conditioning system controls the windshield heating command relay to close when the ambient temperature is lower than a preset temperature threshold, and the normally open contact of the windshield heating command relay is closed; when the ambient temperature is higher than the preset temperature threshold, The windshield heating command relay is not closed, and the normally open contact of the windshield heating command relay is disconnected;
  • the windshield heating contactor When the ambient temperature is lower than the preset temperature threshold and the windshield heating switch is turned on, the windshield heating contactor is engaged, and the windshield starts to heat; when the ambient temperature is higher than the preset temperature threshold and the windshield When the heating switch is turned on, the windshield heating contactor is not closed, and the windshield is not heated.
  • a windshield glass electric heating control system including: a train control and management system TCMS, an air conditioning system, and a windshield glass electric heating control circuit, the windshield glass electric heating control circuit It includes a series-connected electric glass control circuit breaker, a windshield heating command relay, a windshield overheating protection device, a windshield heating switch, and a windshield heating contactor; the windshield heating command relay is connected to the DO port of the TCMS; the air conditioner The system includes an air conditioning unit and a temperature sensor, the temperature sensor is used to monitor the ambient temperature; the air conditioning system is used to transmit the ambient temperature to the TCMS through the network;
  • the TCMS is used to control the DO port to output a first level when the ambient temperature is lower than a preset temperature threshold, and then control the windshield heating command relay to pull in and the normally open contact of the windshield heating command relay Closed; when the ambient temperature is higher than the preset temperature threshold, the DO port is controlled to output the second level, and then the windshield heating command relay is controlled not to be closed, and the normally open contact of the windshield heating command relay is disconnected ;
  • the windshield heating contactor When the ambient temperature is lower than the preset temperature threshold and the windshield heating switch is turned on, the windshield heating contactor is engaged, and the windshield starts to heat; when the ambient temperature is higher than the preset temperature threshold and the windshield When the heating switch is turned on, the windshield heating contactor is not closed, and the windshield is not heated.
  • an ambient temperature signal is introduced into the windshield glass heating control circuit, and a windshield heating command relay is added.
  • the windshield heating command relay is based on the ambient temperature and the preset temperature.
  • the temperature threshold is set to control the work of the windshield, and the temperature threshold of the electric heating of the windshield can be adjusted according to the climate and season where the rail vehicle is operating. There is no need to replace the windshield or the overheating protection device of the windshield.
  • Fig. 1 shows a schematic diagram of a heating control circuit of an electric heating control scheme for windshield glass in the related art
  • Figure 2 shows a schematic diagram of a heating main power supply circuit of a windshield electric heating control scheme in the related art
  • Figure 3 shows a schematic diagram of the work flow of electric heating of windshield glass in the related art
  • FIG. 4 shows a schematic structural diagram of a windshield glass electric heating control circuit in Embodiment 1 of the present application
  • FIG. 5 shows a schematic diagram of the implementation process of the windshield glass electric heating control method in the second embodiment of the present application
  • Fig. 6 shows a schematic diagram of a part of the circuit of the air conditioning system in the third embodiment of the present application.
  • FIG. 7 shows a schematic circuit diagram of a windshield electric heating control system in the third embodiment of the present application.
  • FIG. 8 shows a schematic diagram of a part of the circuit of the network system in the fourth embodiment of the present application.
  • Fig. 9 shows a schematic circuit diagram of a windshield electric heating control system in the fourth embodiment of the present application.
  • Electric heating of windshield glass involves temperature range and overheating protection device:
  • Temperature range Electric heating windshield glass has a temperature heating range. Once the temperature range of the same electric heating windshield glass is determined, the heating temperature range will not change.
  • Overheating protection device The electric heating windshield is equipped with an overheating protection device to control the heating of the glass.
  • the overheating protection device can be integrated on the windshield glass or separated from the windshield glass.
  • Fig. 1 shows a schematic diagram of a heating control circuit of an electric heating control scheme for a windshield glass in the related art.
  • the circuit is powered by DC voltage, including the windshield heating button/switch (button with light), windshield overheating protection device, windshield heating contactor, one end of the windshield overheating protection device is connected to the electric heating glass control circuit breaker, and the other One end is connected with a windshield heating switch, and the other end of the windshield heating switch is connected with a windshield heating contactor.
  • the windshield heating button/switch button with light
  • windshield overheating protection device one end of the windshield overheating protection device is connected to the electric heating glass control circuit breaker, and the other One end is connected with a windshield heating switch, and the other end of the windshield heating switch is connected with a windshield heating contactor.
  • Fig. 2 shows a schematic diagram of a heating main power supply circuit of an electric heating control scheme for a windshield glass in the related art.
  • the circuit is powered by AC voltage, and one end of the windshield heating contactor is connected to an electric glass power supply circuit breaker, and the other end is connected to the windshield.
  • Fig. 3 shows a schematic diagram of the work flow of electric heating of the windshield in the related art.
  • the windshield heating button/switch As shown in the figure, press the windshield heating button/switch, the windshield will be heated according to the process shown in Figure 3, reset the windshield button, the electric heating will not work.
  • the temperature range of the overheating temperature device is a key factor in glass heating.
  • the windshield glass heating works in the temperature range of 32°C-44°C. When the glass temperature reaches 44°C, the normally closed contact of the overheating protection device is broken. When the glass temperature drops below 32°C, the normally closed contact of the overheat protection device is closed, and the electric heating restarts heating.
  • the electric heating temperature range cannot be changed. If you really need to change the temperature range, you can only replace the overheating protection device or the entire windshield glass.
  • the cost of changing the temperature range is relatively high, and for the windshield that has been installed Glass also involves disassembly and assembly, which has a greater impact on vehicle production.
  • the embodiments of the present application provide a windshield glass electric heating control circuit, method and system. According to the temperature detected by the temperature sensor of the air conditioning system, the air conditioning system and the network system use the temperature value to control the relay to control the electric heating glass. Without replacing the overheating protection device or the windshield glass, the working temperature range of the electric heating of the windshield glass can be changed.
  • the solutions in the embodiments of the present application can be implemented in various computer languages, for example, the object-oriented programming language Java and the literal scripting language JavaScript.
  • FIG. 4 shows a schematic structural diagram of a windshield glass electric heating control circuit in Example 1 of the present application.
  • the windshield electric heating control circuit includes: an electric heating glass control circuit breaker, a windshield heating command relay, a windshield overheating protection device, a windshield heating switch, a windshield heating contactor, and the electric heating glass controls a circuit breaker
  • the windshield glass heating command relay, the windshield glass overheating protection device, the windshield glass heating switch, and the windshield heating contactor are connected in series in sequence, among which,
  • the windshield heating command relay When the ambient temperature is lower than the preset temperature threshold, the windshield heating command relay is closed, and the normally open contact of the windshield heating command relay is closed; when the ambient temperature is lower than the preset temperature threshold and the windshield is heated When the switch is turned on, the windshield heating contactor is closed, and the windshield starts to heat;
  • the windshield heating command relay When the ambient temperature is higher than the preset temperature threshold, the windshield heating command relay does not pull in, and the normally open contact of the windshield heating command relay is disconnected; when the ambient temperature is higher than the preset temperature threshold and the windshield When the glass heating switch is turned on, the windshield glass heating contactor is not closed, and the windshield glass is not heated.
  • the embodiment of the application introduces the ambient temperature into the control loop of the windshield glass, thereby realizing the adjustment of the working temperature range of the windshield glass, and adjusts the working temperature range of the electric heating of the windshield glass according to the climate and season where the rail vehicle is operating, without the need to replace the windshield glass Or windshield overheating protection device, only need to change the air-conditioning system or vehicle network system software, and the lower limit of the windshield electric heating working temperature can be changed flexibly.
  • the embodiment of the present application can flexibly perform windshield electric heating according to the vehicle operating environment. Adjustment of heating working temperature range.
  • the windshield heating command relay is controlled by an air-conditioning system
  • the normally open contact of the windshield heating command relay is a windshield heating command signal of the air-conditioning system, which is monitored by the air-conditioning system according to the temperature sensor.
  • the ambient temperature when the ambient temperature is lower than the preset temperature threshold, the air conditioning system outputs a normally open contact closing command signal; when the ambient temperature is higher than the preset temperature threshold, the air conditioning system outputs a normally open contact opening command signal.
  • the windshield heating command relay is controlled by the DO port of the train control and management system TCMS.
  • the DO port of the TCMS When the DO port of the TCMS outputs the first level, the windshield heating command relay is closed, and the windshield heating command relay is closed at the DO of the TCMS.
  • the windshield heating command relay When the port outputs the second level, the windshield heating command relay does not turn on, and the TCMS obtains the ambient temperature according to the feedback of the temperature sensor of the air conditioning system.
  • the DO port of TCMS outputs the first Level; when the ambient temperature is higher than the preset temperature threshold, the DO port of TCMS outputs the second level.
  • the air conditioning system or TCMS receives an instruction to change the temperature threshold, and modifies the temperature threshold according to the instruction.
  • the first level is a high level; the second level is a low level.
  • the embodiment of the present application provides a method for controlling electric heating of a windshield glass.
  • FIG. 5 shows a schematic diagram of the implementation process of the windshield glass electric heating control method in the second embodiment of the present application.
  • the method for controlling electric heating of windshield glass includes:
  • Step 501 Monitor the ambient temperature
  • Step 502 When the ambient temperature is lower than the preset temperature threshold, the windshield heating command relay is controlled to close, and the normally open contact of the windshield heating command relay is closed; when the ambient temperature is lower than the preset temperature threshold and the windshield heating switch is connected When the windshield glass heating contactor is closed, the windshield glass starts to heat up;
  • Step 503 When the ambient temperature is higher than the preset temperature threshold, the windshield heating command relay is controlled not to pull in, and the normally open contact of the windshield heating command relay is disconnected; when the ambient temperature is higher than the preset temperature threshold and the windshield is heated When the switch is turned on, the heating contactor of the windshield glass does not close, and the windshield glass does not heat;
  • the windshield heating command relay is connected in series with the windshield heating control circuit.
  • the embodiment of the application introduces the ambient temperature into the control circuit of the windshield glass, thereby realizing the adjustment of the working temperature range of the windshield glass, and adjusts the working temperature range of the electric heating of the windshield glass according to the climate and season where the rail vehicle is operating, without the need to replace the windshield glass Or windshield overheating protection device, only need to change the air-conditioning system or vehicle network system software, and the lower limit of the windshield electric heating working temperature can be changed flexibly.
  • the embodiment of the present application can flexibly perform windshield electric heating according to the vehicle operating environment. Adjustment of heating working temperature range.
  • the windshield heating command relay is controlled by an air-conditioning system
  • the normally open contact of the windshield heating command relay is a windshield heating command signal of the air-conditioning system, which is monitored by the air-conditioning system according to the temperature sensor.
  • the ambient temperature when the ambient temperature is lower than the preset temperature threshold, the air conditioning system outputs a normally open contact closing command signal; when the ambient temperature is higher than the preset temperature threshold, the air conditioning system outputs a normally open contact opening command signal.
  • the windshield heating command relay is controlled by the DO port of the train control and management system TCMS.
  • the DO port of the TCMS When the DO port of the TCMS outputs the first level, the windshield heating command relay is closed, and the windshield heating command relay is closed at the DO of the TCMS.
  • the windshield heating command relay When the port outputs the second level, the windshield heating command relay does not turn on, and the TCMS obtains the ambient temperature according to the feedback of the temperature sensor of the air conditioning system.
  • the DO port of TCMS outputs the first Level; when the ambient temperature is higher than the preset temperature threshold, the DO port of TCMS outputs the second level.
  • it further includes:
  • the first level is a high level; the second level is a low level.
  • the temperature threshold is a lower limit value of the temperature at which the windshield glass works.
  • an embodiment of the present application also provides a windshield glass electric heating control system, which will be described below.
  • Fig. 6 shows a schematic diagram of a part of the circuit of the air conditioning system in the third embodiment of the present application.
  • Fig. 7 shows a schematic circuit diagram of a windshield electric heating control system in the third embodiment of the present application.
  • the windshield electric heating control system includes: an air-conditioning system, and a windshield electric heating control circuit.
  • the air-conditioning system includes an air-conditioning unit and a temperature sensor.
  • the temperature sensor is used to monitor the ambient temperature.
  • the air-conditioning system includes a windshield heating command relay, and a normally open contact of the windshield heating command relay is connected in series with the windshield overheat protection device of the windshield electric heating control circuit, the windshield heating switch, and the windshield heating contactor;
  • the air conditioning system controls the windshield heating command relay to close when the ambient temperature is lower than a preset temperature threshold, and the normally open contact of the windshield heating command relay is closed; when the ambient temperature is higher than the preset temperature threshold, The windshield heating command relay is not closed, and the normally open contact of the windshield heating command relay is disconnected;
  • the windshield heating contactor When the ambient temperature is lower than the preset temperature threshold and the windshield heating switch is turned on, the windshield heating contactor is engaged, and the windshield starts to heat; when the ambient temperature is higher than the preset temperature threshold and the windshield When the heating switch is turned on, the windshield heating contactor is not closed, and the windshield is not heated.
  • a temperature sensor can be provided at the fresh air outlet of the air conditioning unit to monitor the ambient temperature outside the vehicle in real time and feed it back to the air conditioning unit.
  • Add a relay windshield heating command relay
  • the relay When the ambient temperature is lower than the set temperature, the relay is closed and its normally open contact is closed.
  • the relay When the ambient temperature is higher than the set temperature value, the relay does not pull in, and its normally open contact is disconnected. For the temperature set point, only the software of the air-conditioning system needs to be changed.
  • the "windshield heating command" signal of the air-conditioning system is the normally open contact of the windshield heating command relay.
  • the normally open contact is added to the windshield heating control circuit.
  • the working temperature of the windshield glass has been changed from 32°C-44°C to 22°C-44°C.
  • 22°C is the lower temperature value of the windshield glass.
  • an embodiment of the present application also provides a windshield glass electric heating control system, which will be described below.
  • FIG. 8 shows a schematic diagram of a part of the circuit of the network system in the fourth embodiment of the present application.
  • Fig. 9 shows a schematic circuit diagram of a windshield electric heating control system in the fourth embodiment of the present application.
  • the windshield electric heating control system includes: a train control and management system TCMS, an air conditioning system, and a windshield electric heating control circuit.
  • the windshield electric heating control circuit includes a series-connected electric heating glass control circuit breaker , Windshield heating command relay, windshield overheating protection device, windshield heating switch, windshield heating contactor; the windshield heating command relay is connected to the DO port of TCMS;
  • the air conditioning system includes an air conditioning unit and a temperature sensor, so The temperature sensor is used to monitor the ambient temperature; the air conditioning system is used to transmit the ambient temperature to the TCMS through the network;
  • the TCMS is used to control the DO port to output a first level when the ambient temperature is lower than a preset temperature threshold, and then control the windshield heating command relay to pull in and the normally open contact of the windshield heating command relay Closed; when the ambient temperature is higher than the preset temperature threshold, the DO port is controlled to output the second level, and then the windshield heating command relay is controlled not to be closed, and the normally open contact of the windshield heating command relay is disconnected ;
  • the windshield heating contactor When the ambient temperature is lower than the preset temperature threshold and the windshield heating switch is turned on, the windshield heating contactor is engaged, and the windshield starts to heat; when the ambient temperature is higher than the preset temperature threshold and the windshield When the heating switch is turned on, the windshield heating contactor is not closed, and the windshield is not heated.
  • the temperature sensor at the fresh air outlet of the air conditioning unit can detect the ambient temperature outside the vehicle, and the air conditioning system transmits the detected ambient temperature outside the vehicle to the vehicle TCMS system through the network.
  • the DO port of TCMS When the ambient temperature outside the vehicle is lower than the set temperature value, the DO port of TCMS has a high level output. At this time, the relay is closed and the normally open contact of the relay is closed; when the ambient temperature outside the vehicle is higher than the set temperature value, The DO port of TCMS has a low-level output. At this time, the relay is not closed, and the normally open contact of the relay is disconnected.
  • the software of the TCMS system needs to be changed.
  • the "windshield heating command" signal of the network system is the normally open contact of the relay driven by the network DO.
  • the embodiment of the present application adds the normally open contact of the relay to the windshield heating control circuit.
  • the working temperature of the windshield glass has been changed from 32°C-44°C to 22°C-44°C, and 22°C is the lower temperature value of the windshield glass.
  • the embodiment of the application can use the temperature value to control the relay by the air-conditioning system and the network system to control the electric heating glass; the embodiment of the application can be performed on the vehicle-related equipment, that is, the temperature sensor of the air-conditioning system Application, flexibly adjust the working temperature range of windshield glass electric heating according to the operating environment of the vehicle.
  • this application can be provided as methods, systems, or computer program products. Therefore, this application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device.
  • the device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.
  • These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment.
  • the instructions provide steps for implementing the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

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Abstract

一种风挡玻璃电加热控制电路、控制方法及系统，包括：在环境温度低于预设第一阈值时，风挡玻璃加热命令继电器吸合、所述风挡玻璃加热命令继电器的常开触点闭合；在环境温度低于预设第一阈值且所述风挡玻璃加热开关接通时所述风挡玻璃加热接触器吸合，所述风挡玻璃开始加热；在环境温度高于预设第二阈值时，风挡玻璃加热命令继电器不吸合、所述风挡玻璃加热命令继电器的常开触点断开；在环境温度高于预设第二阈值且所述风挡玻璃加热开关接通时所述风挡玻璃加热接触器不吸合，所述风挡玻璃不加热。采用上述方案，可以根据轨道车辆运行所在地的气候、季节，调整风挡玻璃电加热的温度阈值，不需要更换风挡玻璃或风挡玻璃的过热保护装置。

Description

一种风挡玻璃电加热控制电路、控制方法及系统 技术领域
本申请涉及轨道车辆技术，具体地，涉及一种风挡玻璃电加热控制电路、控制方法及系统。
背景技术
电加热玻璃是具有一定光透过率、通电后可实现加热的光学透明材料。其主要功能是在保证驾驶员有良好视野的前提下，实现在恶劣环境下能够去冰、除霜、除雾，为司机提供良好的视线，以观察信号和路况等信息，从而保障行驶安全。电加热性能是影响风挡玻璃功能、可靠性、寿命的重要指标。
传统的控制方式是设置一个开关对玻璃加热进行控制，打到“开”档位，风挡玻璃开始加热，在加热期间，玻璃根据加热温度范围，自行切断或接通电加热；打到“关”档位，风挡玻璃停止加热。
相关技术中存在的问题：
传统的控制方式只对风挡玻璃电加热的接通\关断进行控制，无法控制玻璃加热的温度范围。
发明内容
本申请实施例中提供了一种风挡玻璃电加热控制电路、控制方法及系统，以解决上述技术问题。
根据本申请实施例的第一个方面，提供了一种风挡玻璃电加热控制电路，包括：电热玻璃控制断路器、风挡玻璃加热命令继电器、风挡玻璃过热保护装置、风挡玻璃加热开关、风挡玻璃加热接触器，所述电热玻璃控制断路器、风挡玻璃加热命令继电器、风挡玻璃过热保护装置、风挡玻璃加热开关、风挡玻璃加热接触器依次串联连接，其中，
在环境温度低于预设温度阈值时，所述风挡玻璃加热命令继电器吸合、所述风挡玻璃加热命令继电器的常开触点闭合；在环境温度低于预设温度阈值且所述风挡玻璃加热开关接通时所述风挡玻璃加热接触器吸合，所述风挡玻璃开始加热；
在环境温度高于预设温度阈值时，所述风挡玻璃加热命令继电器不吸合、所述风挡玻璃加热命令继电器的常开触点断开；在环境温度高于预设温度阈值且所述风挡玻璃加热开关接通时所述风挡玻璃加热接触器不吸合，所述风挡玻璃不加热。
根据本申请实施例的第二个方面，提供了一种风挡玻璃电加热控制方法，包括：
监测环境温度；
在环境温度低于预设温度阈值时，控制风挡玻璃加热命令继电器吸合、风挡玻璃加热命令继电器的常开触点闭合；在环境温度低于预设温度阈值且风挡玻璃加热开关接通时风挡玻璃加热接触器吸合，风挡玻璃开始加热；
在环境温度高于预设温度阈值时，控制风挡玻璃加热命令继电器不吸合、风挡玻璃加热命令继电器的常开触点断开；在环境温度高于预设温度阈值且风挡玻璃加热开关接通时风挡玻璃加热接触器不吸合，风挡玻璃不加热；
其中，所述风挡玻璃加热命令继电器串联于风挡玻璃加热控制电路中。
根据本申请实施例的第三个方面，提供了一种风挡玻璃电加热控制系统，包括：空调系统、以及如风挡玻璃电加热控制电路，所述空调系统包括空调机组和温度传感器，所述温度传感器用于监测环境温度，所述空调系统包括风挡玻璃加热命令继电器，所述风挡玻璃加热命令继电器的常开触点与所述风挡玻璃电加热控制电路的风挡玻璃过热保护装置、风挡玻璃加热开关和风挡玻璃加热接触器串联；
所述空调系统在环境温度低于预设温度阈值时控制所述风挡玻璃加热命令继电器吸合、所述风挡玻璃加热命令继电器的常开触点闭合；在环境温度高 于预设温度阈值时，所述风挡玻璃加热命令继电器不吸合、所述风挡玻璃加热命令继电器的常开触点断开；
在环境温度低于预设温度阈值且所述风挡玻璃加热开关接通时所述风挡玻璃加热接触器吸合，所述风挡玻璃开始加热；在环境温度高于预设温度阈值且所述风挡玻璃加热开关接通时所述风挡玻璃加热接触器不吸合，所述风挡玻璃不加热。
根据本申请实施例的第四个方面，提供了一种风挡玻璃电加热控制系统，包括：列车控制和管理系统TCMS、空调系统、以及风挡玻璃电加热控制电路，所述风挡玻璃电加热控制电路包括串联连接的电热玻璃控制断路器、风挡玻璃加热命令继电器、风挡玻璃过热保护装置、风挡玻璃加热开关、风挡玻璃加热接触器；所述风挡玻璃加热命令继电器与TCMS的DO口相连；所述空调系统包括空调机组和温度传感器，所述温度传感器用于监测环境温度；所述空调系统用于将所述环境温度通过网络传输至TCMS；
所述TCMS用于在所述环境温度低于预设温度阈值时控制DO口输出第一电平，进而控制所述风挡玻璃加热命令继电器吸合、所述风挡玻璃加热命令继电器的常开触点闭合；在所述环境温度高于预设温度阈值时控制DO口输出第二电平，进而控制所述风挡玻璃加热命令继电器不吸合、所述风挡玻璃加热命令继电器的常开触点断开；
在环境温度低于预设温度阈值且所述风挡玻璃加热开关接通时所述风挡玻璃加热接触器吸合，所述风挡玻璃开始加热；在环境温度高于预设温度阈值且所述风挡玻璃加热开关接通时所述风挡玻璃加热接触器不吸合，所述风挡玻璃不加热。
采用本申请实施例中提供的风挡玻璃电加热控制电路、方法及系统，在风挡玻璃加热控制电路中引入环境温度信号，增加风挡玻璃加热命令继电器，所述风挡玻璃加热命令继电器根据环境温度和预设温度阈值控制风挡玻璃工作，可以根据轨道车辆运行所在地的气候、季节，调整风挡玻璃电加热的温度阈值， 不需要更换风挡玻璃或风挡玻璃的过热保护装置。
附图说明
此处所说明的附图用来提供对本申请的进一步理解，构成本申请的一部分，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：
图1示出了相关技术中风挡玻璃的电加热控制方案的加热控制电路示意图；
图2示出了相关技术中风挡玻璃的电加热控制方案的加热主供电电路示意图；
图3示出了相关技术中风挡玻璃的电加热工作流程示意图；
图4示出了本申请实施例一中风挡玻璃电加热控制电路的结构示意图；
图5示出了本申请实施例二中风挡玻璃电加热控制方法实施的流程示意图；
图6示出了本申请实施例三中空调系统的部分电路示意图；
图7示出了本申请实施例三中风挡玻璃电加热控制系统的电路示意图；
图8示出了本申请实施例四中网络系统的部分电路示意图；
图9示出了本申请实施例四中风挡玻璃电加热控制系统的电路示意图。
具体实施方式
在实现本申请的过程中，技术人员发现：
风挡玻璃的电加热涉及温度范围及过热保护装置：
(1)温度范围：电加热风挡玻璃都有一个温度加热范围，对于同一块电加热风挡玻璃其温度范围一旦确定下来，加热的温度范围是不会改变的。
(2)过热保护装置：电加热风挡玻璃设有一个过热保护装置对玻璃加热进行控制，该过热保护装置可集成在风挡玻璃上，也可分离于风挡玻璃。在风挡玻璃加热过程中，过热保护装置的功能是：当玻璃温度达到44℃时，过热保护装置的常闭触点断开，风挡玻璃加热接触器＝64-Q01不吸合，＝64-Q01的主触点断开，电加热停止工作；当玻璃温度降到32℃以下时，过热保护装置的常 闭触点闭合，风挡玻璃加热接触器＝64-Q01吸合，＝64-Q01的主触点闭合，电加热重新开始加热。
图1示出了相关技术中风挡玻璃的电加热控制方案的加热控制电路示意图。
如图所示，电路是直流电压供电，包括风挡玻璃加热按钮/开关(带灯按钮)、风挡玻璃过热保护装置、风挡玻璃加热接触器，风挡玻璃过热保护装置一端连接电热玻璃控制断路器、另一端连接风挡玻璃加热开关，所述风挡玻璃加热开关的另一端连接风挡玻璃加热接触器。
图2示出了相关技术中风挡玻璃的电加热控制方案的加热主供电电路示意图。
如图所示，电路是交流电压供电，所述风挡玻璃加热接触器一端连接电热玻璃供电断路器、另一端连接风挡玻璃。
图3示出了相关技术中风挡玻璃的电加热工作流程示意图。
如图所示，按下风挡玻璃加热按钮/开关，风挡玻璃按照图3所示流程加热，复位风挡玻璃按钮，电加热不工作。
由图3可知，过热温度装置的温度范围是玻璃加热的关键影响因素，风挡玻璃加热在32℃-44℃温度范围内工作，当玻璃温度达到44℃时，过热保护装置的常闭触点断开，电加热停止工作；当玻璃温度降到32℃以下时，过热保护装置的常闭触点闭合，电加热重新开始加热。
对于风挡玻璃电加热，其温度范围一旦确定下来便不能改变。如果想改变风挡玻璃电加热的温度范围，例如将温度范围32℃-44℃更改为22℃-44℃(改变下限温度值，不改变上限温度值，因为上限温度值时风挡玻璃已经加热到去除雾、霜等的状态)，则需要更换过热保护装置(对于过热保护装置与风挡玻璃分开安装的情况)或更换整块风挡玻璃(对于过热保护装置与风挡玻璃集成在一起的情况)。
对于风挡玻璃电加热，有时需要根据季节、环境设定其工作温度范围，目前的风挡玻璃电加热控制方案都是不能改变其工作温度范围的。
对于既有风挡玻璃其电加热的温度范围是不能改变的，如果确实需要更改温度范围只能更换过热保护装置或是整块风挡玻璃，更改温度范围的成本比较大，而且对于已经装车的风挡玻璃还涉及到拆装，对车辆生产影响较大。
针对上述问题，本申请实施例中提供了一种风挡玻璃电加热控制电路、方法及系统，根据空调系统温度传感器检测的温度，由空调系统、网络系统利用此温度值控制继电器，进行控制电热玻璃的工作，在不更换过热保护装置或是风挡玻璃的前提下，实现风挡玻璃电加热的工作温度范围更改。
本申请实施例中的方案可以采用各种计算机语言实现，例如，面向对象的程序设计语言Java和直译式脚本语言JavaScript等。
为了使本申请实施例中的技术方案及优点更加清楚明白，以下结合附图对本申请的示例性实施例进行进一步详细的说明，显然，所描述的实施例仅是本申请的一部分实施例，而不是所有实施例的穷举。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
实施例一
图4示出了本申请实施例一中风挡玻璃电加热控制电路的结构示意图。
如图所示，所述风挡玻璃电加热控制电路包括：电热玻璃控制断路器、风挡玻璃加热命令继电器、风挡玻璃过热保护装置、风挡玻璃加热开关、风挡玻璃加热接触器，所述电热玻璃控制断路器、风挡玻璃加热命令继电器、风挡玻璃过热保护装置、风挡玻璃加热开关、风挡玻璃加热接触器依次串联连接，其中，
在环境温度低于预设温度阈值时，所述风挡玻璃加热命令继电器吸合、所述风挡玻璃加热命令继电器的常开触点闭合；在环境温度低于预设温度阈值且所述风挡玻璃加热开关接通时所述风挡玻璃加热接触器吸合，所述风挡玻璃开始加热；
在环境温度高于预设温度阈值时，所述风挡玻璃加热命令继电器不吸合、 所述风挡玻璃加热命令继电器的常开触点断开；在环境温度高于预设温度阈值且所述风挡玻璃加热开关接通时所述风挡玻璃加热接触器不吸合，所述风挡玻璃不加热。
本申请实施例将环境温度引入风挡玻璃的控制回路中，进而实现风挡玻璃工作温度范围的调整，根据轨道车辆运行所在地的气候、季节，调整风挡玻璃电加热的工作温度范围，不需要更换风挡玻璃或风挡玻璃的过热保护装置，只需更改空调系统或车辆网络系统的软件即可，且风挡玻璃电加热工作温度的下限值改变灵活，本申请实施例能够根据车辆运行环境灵活进行风挡玻璃电加热工作温度范围的调整。
在一种实施方式中，所述风挡玻璃加热命令继电器受空调系统控制，所述风挡玻璃加热命令继电器的常开触点为空调系统的风挡玻璃加热命令信号，所述空调系统根据温度传感器监测得到环境温度，所述环境温度低于预设温度阈值时所述空调系统输出常开触点闭合命令信号；所述环境温度高于预设温度阈值时所述空调系统输出常开触点断开命令信号。
在一种实施方式中，所述风挡玻璃加热命令继电器受列车控制和管理系统TCMS的DO口控制，在TCMS的DO口输出第一电平时所述风挡玻璃加热命令继电器吸合，在TCMS的DO口输出第二电平时所述风挡玻璃加热命令继电器不吸合，所述TCMS根据空调系统的温度传感器的反馈得到环境温度，所述环境温度低于预设温度阈值时TCMS的DO口输出第一电平；所述环境温度高于预设温度阈值时TCMS的DO口输出第二电平。
在一种实施方式中，所述空调系统或TCMS接收改变温度阈值的指令，并根据所述指令修改所述温度阈值。
在一种实施方式中，所述第一电平为高电平；所述第二电平为低电平。
实施例二
基于同一构思，本申请实施例提供了一种风挡玻璃电加热控制方法。
图5示出了本申请实施例二中风挡玻璃电加热控制方法实施的流程示意图。
如图所示，所述风挡玻璃电加热控制方法包括：
步骤501、监测环境温度；
步骤502、在环境温度低于预设温度阈值时，控制风挡玻璃加热命令继电器吸合、风挡玻璃加热命令继电器的常开触点闭合；在环境温度低于预设温度阈值且风挡玻璃加热开关接通时风挡玻璃加热接触器吸合，风挡玻璃开始加热；
步骤503、在环境温度高于预设温度阈值时，控制风挡玻璃加热命令继电器不吸合、风挡玻璃加热命令继电器的常开触点断开；在环境温度高于预设温度阈值且风挡玻璃加热开关接通时风挡玻璃加热接触器不吸合，风挡玻璃不加热；
其中，所述风挡玻璃加热命令继电器串联于风挡玻璃加热控制电路中。
本申请实施例将环境温度引入风挡玻璃的控制电路中，进而实现风挡玻璃工作温度范围的调整，根据轨道车辆运行所在地的气候、季节，调整风挡玻璃电加热的工作温度范围，不需要更换风挡玻璃或风挡玻璃的过热保护装置，只需更改空调系统或车辆网络系统的软件即可，且风挡玻璃电加热工作温度的下限值改变灵活，本申请实施例能够根据车辆运行环境灵活进行风挡玻璃电加热工作温度范围的调整。
在一种实施方式中，所述风挡玻璃加热命令继电器受空调系统控制，所述风挡玻璃加热命令继电器的常开触点为空调系统的风挡玻璃加热命令信号，所述空调系统根据温度传感器监测得到环境温度，所述环境温度低于预设温度阈值时所述空调系统输出常开触点闭合命令信号；所述环境温度高于预设温度阈值时所述空调系统输出常开触点断开命令信号。
在一种实施方式中，所述风挡玻璃加热命令继电器受列车控制和管理系统TCMS的DO口控制，在TCMS的DO口输出第一电平时所述风挡玻璃加热命令继电器吸合，在TCMS的DO口输出第二电平时所述风挡玻璃加热命令继电器不吸合，所述TCMS根据空调系统的温度传感器的反馈得到环境温度，所述 环境温度低于预设温度阈值时TCMS的DO口输出第一电平；所述环境温度高于预设温度阈值时TCMS的DO口输出第二电平。
在一种实施方式中，进一步包括：
接收所述空调系统或TCMS下发的改变温度阈值的指令，并根据所述指令修改所述温度阈值。
在一种实施方式中，所述第一电平为高电平；所述第二电平为低电平。
在一种实施方式中，所述温度阈值为风挡玻璃工作的温度下限值。
实施例三
基于同一构思，本申请实施例还提供一种风挡玻璃电加热控制系统，下面进行说明。
图6示出了本申请实施例三中空调系统的部分电路示意图；
图7示出了本申请实施例三中风挡玻璃电加热控制系统的电路示意图。
如图所示，所述风挡玻璃电加热控制系统，包括：空调系统、以及如风挡玻璃电加热控制电路，所述空调系统包括空调机组和温度传感器，所述温度传感器用于监测环境温度，所述空调系统包括风挡玻璃加热命令继电器，所述风挡玻璃加热命令继电器的常开触点与所述风挡玻璃电加热控制电路的风挡玻璃过热保护装置、风挡玻璃加热开关和风挡玻璃加热接触器串联；
所述空调系统在环境温度低于预设温度阈值时控制所述风挡玻璃加热命令继电器吸合、所述风挡玻璃加热命令继电器的常开触点闭合；在环境温度高于预设温度阈值时，所述风挡玻璃加热命令继电器不吸合、所述风挡玻璃加热命令继电器的常开触点断开；
在环境温度低于预设温度阈值且所述风挡玻璃加热开关接通时所述风挡玻璃加热接触器吸合，所述风挡玻璃开始加热；在环境温度高于预设温度阈值且所述风挡玻璃加热开关接通时所述风挡玻璃加热接触器不吸合，所述风挡玻璃不加热。
具体实施时，可以在空调机组的新风口处设有温度传感器，实时监测车辆外的环境温度并反馈到空调机组。在空调机组的控制电路中增加一个继电器(风挡玻璃加热命令继电器)，当环境温度低于设定温度值时，继电器吸合，其常开触点闭合。当环境温度高于设定温度值时，继电器不吸合，其常开触点断开。对于温度设定值，只需更改空调系统的软件即可。
空调系统的“风挡玻璃加热命令”信号即是风挡玻璃加热命令继电器的常开触点，本申请实施例将常开触点加入风挡玻璃加热控制电路中。
图7中＝61-E01的N/P点即为图6中风挡玻璃加热命令继电器的一组常开触点；与图1比较，图7增加了风挡玻璃加热命令继电器的一组常开触点。
具体实施时，假设需要将风挡玻璃的温度范围32℃-44℃更改为22℃-44℃，则设置空调系统软件，将温度阈值设定为22℃：
当环境温度低于22℃，空调控制激活继电器＝61-K01，其常开触点闭合，此时按下风挡玻璃加热开关，加热接触器＝64-Q01吸合，风挡玻璃开始加热；
当环境温度高于22℃，空调控制不激活继电器＝61-K01，其常开触点断开，此时按下风挡玻璃加热开关，加热接触器＝64-Q01不吸合，风挡玻璃不加热。
综上可知，风挡玻璃的工作温度由32℃-44℃已经更改为22℃-44℃，22℃是风挡玻璃工作的温度下线值。
实施例四
基于同一构思，本申请实施例还提供一种风挡玻璃电加热控制系统，下面进行说明。
图8示出了本申请实施例四中网络系统的部分电路示意图；
图9示出了本申请实施例四中风挡玻璃电加热控制系统的电路示意图。
如图所示，所述风挡玻璃电加热控制系统包括：列车控制和管理系统TCMS、空调系统、以及风挡玻璃电加热控制电路，所述风挡玻璃电加热控制电路包括串联连接的电热玻璃控制断路器、风挡玻璃加热命令继电器、风挡玻 璃过热保护装置、风挡玻璃加热开关、风挡玻璃加热接触器；所述风挡玻璃加热命令继电器与TCMS的DO口相连；所述空调系统包括空调机组和温度传感器，所述温度传感器用于监测环境温度；所述空调系统用于将所述环境温度通过网络传输至TCMS；
所述TCMS用于在所述环境温度低于预设温度阈值时控制DO口输出第一电平，进而控制所述风挡玻璃加热命令继电器吸合、所述风挡玻璃加热命令继电器的常开触点闭合；在所述环境温度高于预设温度阈值时控制DO口输出第二电平，进而控制所述风挡玻璃加热命令继电器不吸合、所述风挡玻璃加热命令继电器的常开触点断开；
在环境温度低于预设温度阈值且所述风挡玻璃加热开关接通时所述风挡玻璃加热接触器吸合，所述风挡玻璃开始加热；在环境温度高于预设温度阈值且所述风挡玻璃加热开关接通时所述风挡玻璃加热接触器不吸合，所述风挡玻璃不加热。
具体实施时，空调机组新风口处温度传感器可以检测车外环境温度，空调系统将检测到的车外环境温度通过网络传递给车辆TCMS系统。在风挡玻璃加热控制电路增加一个继电器，继电器由TCMS的DO口控制。当车外环境温度低于设定温度值时，TCMS的DO口有高电平输出，此时继电器吸合，继电器的常开触点闭合；当车外环境温度高于设定温度值时，TCMS的DO口有低电平输出，此时继电器不吸合，继电器的常开触点断开。对于温度设定值，只需更改TCMS系统的软件即可。
网络系统的“风挡玻璃加热命令”信号即是由网络DO驱动的继电器的常开触点，本申请实施例将继电器的常开触点加入风挡玻璃加热控制电路中。
图8中DO即为车辆TCMS系统发出的电平信号，图9中＝61-K02的常开触点即为图8中继电器＝61-K02的一组常开触点；与图1比较，图9增加了继电器＝61-K02的一组常开触点。
具体实施时，假设需要将风挡玻璃的温度范围32℃-44℃更改为22℃-44 ℃，则设置网络系统软件，将温度阈值设定为22℃：
当环境温度低于22℃，TCMS的DO口输出高电平，继电器＝61-K02吸合，其常开触点闭合，此时按下风挡玻璃加热开关，加热接触器＝64-Q01吸合，风挡玻璃开始加热；
当环境温度高于22℃，TCMS的DO口输出低电平，继电器＝61-K02不吸合，其常开触点断开，此时按下风挡玻璃加热开关，加热接触器＝64-Q01不吸合，风挡玻璃不加热。
综上可知，风挡玻璃的工作温度由32℃-44℃已经更改为22℃-44℃，22℃是风挡玻璃工作的温度下线值。
本申请实施例可以根据空调系统温度传感器检测的温度，由空调系统、网络系统利用此温度值控制继电器，进行控制电热玻璃的工作；本申请实施例可以在车辆相关设备即空调系统温度传感器上进行应用，根据车辆运行环境灵活进行风挡玻璃电加热工作温度范围的调整。
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本申请的一些可选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括一些可选实施例以及落入本申请范围的所有变更和修改。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (10)

  1. 一种风挡玻璃电加热控制电路，其特征在于，包括：电热玻璃控制断路器、风挡玻璃加热命令继电器、风挡玻璃过热保护装置、风挡玻璃加热开关、风挡玻璃加热接触器，所述电热玻璃控制断路器、风挡玻璃加热命令继电器、风挡玻璃过热保护装置、风挡玻璃加热开关、风挡玻璃加热接触器依次串联连接，其中，
    在环境温度低于预设温度阈值时，所述风挡玻璃加热命令继电器吸合、所述风挡玻璃加热命令继电器的常开触点闭合；在环境温度低于预设温度阈值且所述风挡玻璃加热开关接通时所述风挡玻璃加热接触器吸合，所述风挡玻璃开始加热；
    在环境温度高于预设温度阈值时，所述风挡玻璃加热命令继电器不吸合、所述风挡玻璃加热命令继电器的常开触点断开；在环境温度高于预设温度阈值且所述风挡玻璃加热开关接通时所述风挡玻璃加热接触器不吸合，所述风挡玻璃不加热。
  2. 根据权利要求1所述的电路，其特征在于，所述风挡玻璃加热命令继电器受空调系统控制，所述风挡玻璃加热命令继电器的常开触点为空调系统的风挡玻璃加热命令信号，所述空调系统根据温度传感器监测得到环境温度，所述环境温度低于预设温度阈值时所述空调系统输出常开触点闭合命令信号；所述环境温度高于预设温度阈值时所述空调系统输出常开触点断开命令信号。
  3. 根据权利要求1所述的电路，其特征在于，所述风挡玻璃加热命令继电器受列车控制和管理系统TCMS的DO口控制，在TCMS的DO口输出第一电平时所述风挡玻璃加热命令继电器吸合，在TCMS的DO口输出第二电平时所述风挡玻璃加热命令继电器不吸合，所述TCMS根据空调系统的温度传感器的反馈得到环境温度，所述环境温度低于预设温度阈值时TCMS的DO口输出第一电平；所述环境温度高于预设温度阈值时TCMS的DO口输出第二电平。
  4. 根据权利要求2或3所述的电路，其特征在于，所述空调系统或TCMS 接收改变温度阈值的指令，并根据所述指令修改所述温度阈值。
  5. 根据权利要求3所述的电路，其特征在于，所述第一电平为高电平；所述第二电平为低电平。
  6. 一种利用如权利要求1至5任一所述的风挡玻璃电加热控制电路进行控制的方法，其特征在于，包括：
    监测环境温度；
    在环境温度低于预设温度阈值时，控制风挡玻璃加热命令继电器吸合、风挡玻璃加热命令继电器的常开触点闭合；在环境温度低于预设温度阈值且风挡玻璃加热开关接通时风挡玻璃加热接触器吸合，风挡玻璃开始加热；
    在环境温度高于预设温度阈值时，控制风挡玻璃加热命令继电器不吸合、风挡玻璃加热命令继电器的常开触点断开；在环境温度高于预设温度阈值且风挡玻璃加热开关接通时风挡玻璃加热接触器不吸合，风挡玻璃不加热；
    其中，所述风挡玻璃加热命令继电器串联于风挡玻璃加热控制电路中。
  7. 根据权利要求6所述的方法，其特征在于，进一步包括：
    接收空调系统或TCMS下发的改变温度阈值的指令，并根据所述指令修改所述温度阈值。
  8. 根据权利要求6所述的方法，其特征在于，所述温度阈值为风挡玻璃工作的温度下限值。
  9. 一种风挡玻璃电加热控制系统，其特征在于，包括：空调系统、以及如风挡玻璃电加热控制电路，所述空调系统包括空调机组和温度传感器，所述温度传感器用于监测环境温度，所述空调系统包括风挡玻璃加热命令继电器，所述风挡玻璃加热命令继电器的常开触点与所述风挡玻璃电加热控制电路的风挡玻璃过热保护装置、风挡玻璃加热开关和风挡玻璃加热接触器串联；
    所述空调系统在环境温度低于预设温度阈值时控制所述风挡玻璃加热命令继电器吸合、所述风挡玻璃加热命令继电器的常开触点闭合；在环境温度高于预设温度阈值时，所述风挡玻璃加热命令继电器不吸合、所述风挡玻璃加热 命令继电器的常开触点断开；
    在环境温度低于预设温度阈值且所述风挡玻璃加热开关接通时所述风挡玻璃加热接触器吸合，所述风挡玻璃开始加热；在环境温度高于预设温度阈值且所述风挡玻璃加热开关接通时所述风挡玻璃加热接触器不吸合，所述风挡玻璃不加热。
  10. 一种风挡玻璃电加热控制系统，其特征在于，包括：列车控制和管理系统TCMS、空调系统、以及风挡玻璃电加热控制电路，所述风挡玻璃电加热控制电路包括串联连接的电热玻璃控制断路器、风挡玻璃加热命令继电器、风挡玻璃过热保护装置、风挡玻璃加热开关、风挡玻璃加热接触器；所述风挡玻璃加热命令继电器与TCMS的DO口相连；所述空调系统包括空调机组和温度传感器，所述温度传感器用于监测环境温度；所述空调系统用于将所述环境温度通过网络传输至TCMS；
    所述TCMS用于在所述环境温度低于预设温度阈值时控制DO口输出第一电平，进而控制所述风挡玻璃加热命令继电器吸合、所述风挡玻璃加热命令继电器的常开触点闭合；在所述环境温度高于预设温度阈值时控制DO口输出第二电平，进而控制所述风挡玻璃加热命令继电器不吸合、所述风挡玻璃加热命令继电器的常开触点断开；
    在环境温度低于预设温度阈值且所述风挡玻璃加热开关接通时所述风挡玻璃加热接触器吸合，所述风挡玻璃开始加热；在环境温度高于预设温度阈值且所述风挡玻璃加热开关接通时所述风挡玻璃加热接触器不吸合，所述风挡玻璃不加热。
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