Delay control system of electric heating glass for electric forklift
By setting the delayed power-on function of the temperature detector and relay control module on the window glass of the electric forklift, the problem of false alarm failure of the lithium battery and long-term heating at room temperature caused by the forgotten shutdown of the window glass heating element of the electric forklift is solved, and the effects of failure prevention and energy saving are achieved.
Patent Information
- Application Number
- CN202422254648.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-13
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-09-13
AI Technical Summary
After the electric forklift window glass forgets to turn off the heating element control switch, the lithium battery voltage drop impact faults or the problem of long-term heating at room temperature, resulting in reduced glass life and waste of energy.
A delay control system for electric heating glass is designed. By setting a temperature detector and relay control module on the window glass, the 5-second delay power-on function is realized, so as to prevent the electric heating wire from falsely reporting a fault when restarting the entire vehicle power supply, and automatically stop heating at room temperature.
It effectively prevents the detection of false alarms of lithium batteries, extends the service life of glass, saves energy, and ensures driving safety.
Smart Images
Figure CN223194847U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of forklifts, in particular to a delay control system for electrically heated glass used on electric forklifts. Background Art
[0002] Electric forklifts, powered by lithium batteries, are essential, efficient handling equipment in modern warehousing and logistics. With their zero-emissions, low noise levels, and flexible operation, they are gradually replacing traditional fuel-powered forklifts and becoming a key option for businesses in their green transformation. Currently, electric forklifts are widely used in warehouses, factories, supermarket distribution centers, and cold chain logistics, not only improving logistics efficiency but also significantly improving the working environment.
[0003] When operating in cold storage environments, electric forklifts are prone to frosting and fogging, which can limit the driver's field of view and compromise operational safety. Therefore, electrically heated windows are essential for safe operation. These systems utilize a built-in heating element connected to a lithium battery. When powered on, they rapidly raise the window surface temperature, effectively preventing condensation and maintaining clear, transparent glass on the front, rear, left, right, and roof windows.
[0004] During use, some drivers forget to turn off the heating element control switch after completing their work. The next time they start the forklift, the heating element instantly operates at high power, causing a voltage drop in the forklift's lithium battery. If the vehicle controller is testing the lithium battery at this time, it will falsely report a battery voltage error or other related faults. Some drivers also forget to turn off the heating element control switch when working in a normal temperature environment, causing the window glass to continue heating, resulting in excessive temperatures and burning. This shortens the glass's lifespan and can even cause burns, while also wasting energy. Utility Model Content
[0005] In order to solve the above problems, the utility model provides a delay control system for electric heated glass used in electric forklifts. In the case that the control switch is forgotten to be turned off, the electric heating function of the vehicle window glass can be delayed when the power of the entire vehicle is restarted, thereby preventing the controller from falsely reporting a fault when testing the battery; at the same time, it can prevent the control switch from being turned off in a normal temperature environment, causing the electric heating wire to heat the glass for a long time, thereby achieving the purpose of extending the service life of the glass and saving energy.
[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present utility model is:
[0007] A delay control system for electrically heated glass used on electric forklifts includes a heating wire for heating the window glass, a control switch, and a vehicle power supply. The window glass is provided with a detector for detecting the window glass temperature, and the detector is connected in series to a temperature detection module. The signal output end of the temperature detection module is connected to the signal end of a relay control module, and the power output end of the relay control module is connected to the heating wire in sequence through a relay and a control switch. The relay control module has a 5s delayed power-on function.
[0008] In a further solution, the positive pole of the vehicle power supply is connected to the temperature detection module, the contacts of the relay, and the temperature detection module respectively through a DC-DC converter, the power output end of the DC-DC converter is connected to the coil of the relay, and the contacts of the relay are connected to the control switch.
[0009] In a further solution, the positive pole of the vehicle power supply is connected to the DC-DC converter through a key switch and a fuse F2, and the power output end of the DC-DC converter is connected to a fuse F3.
[0010] In a further solution, a contactor is provided between the control switch and the heating wire, the coil of the contactor is connected to the control switch, and the two ends of the contactor are connected to the vehicle power supply and the heating wire respectively.
[0011] In a further embodiment, the positive electrode of the vehicle power supply is connected to the contact of the contactor through a fuse F1.
[0012] In a further solution, the control switch is connected in parallel with a light emitting diode; and the detector is a temperature sensing resistor.
[0013] In a further solution, the heating wire includes a front window heating wire, a rear window heating wire, a left window heating wire, a right window heating wire and a top window heating wire arranged in parallel, and each heating wire is connected to a control switch through a contactor to achieve individual control.
[0014] The beneficial effects of this system are:
[0015] 1. This system adds a relay control module to the power input end of the control switch, and the relay control module has a 5s delayed power-on function. Therefore, if the driver forgets to turn off the control switch of the heating wire, when the vehicle power is restarted, the heating wire can be delayed to supply power for heating, thereby preventing the controller from falsely reporting a fault when detecting the vehicle power supply (lithium battery).
[0016] 2. This system is equipped with a detector for detecting the temperature of each window glass, and the detector is connected in series to the temperature detection module, that is, the detector detects the current temperature of the window glass in real time and transmits it to the temperature detection module. When the temperature detection module detects that the temperature of one of the window glasses reaches the threshold value (generally set to 55°C), it outputs an electrical signal to the relay control module, and the relay control module stops the power output, that is, the control switch is in the disconnected state, and the heating wire stops heating.
[0017] 3. This application can prevent the driver from not turning off the control switch in a normal temperature environment, causing the heating wire to heat the glass for a long time, thereby extending the service life of the glass, saving energy, and ensuring driving safety. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The drawings in the specification, which constitute a part of this application, are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.
[0019] Figure 1 This is a principle block diagram of the utility model. DETAILED DESCRIPTION
[0020] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other.
[0021] The relay control module in this application is a known commercially available product, such as the FRM01. Its power supply voltage is 12V. It not only converts and outputs power but also provides various functions, such as delayed power-on and power supply protection. In this embodiment, the relay control module specifically features a 5-second power-on delay. When the relay control module's VCC port receives power, it waits 5 seconds before outputting +12V power from the OUT port. This effectively addresses potential voltage fluctuations and current surges that can occur during power-on, protecting circuit components and extending their service life.
[0022] That is, when the driver forgets to turn off the control switch of the heated glass and restarts the vehicle power, the heating wire can be powered on for 5 seconds, thereby preventing the controller from falsely reporting a fault when detecting the lithium battery.
[0023] The temperature detection module in this application is composed of 5 KSD9700 normally open temperature control switches in parallel, and the power supply voltage is 12V.
[0024] The resistance value of the temperature-sensing resistor in this application will change with the change of temperature, that is, the corresponding temperature of the vehicle window glass is determined by measuring its resistance value.
[0025] Example 1:
[0026] To heat one of the windows:
[0027] This embodiment provides a delay control system for electrically heated glass used in electric forklifts. The system includes a heating wire for heating the window glass, a control switch, and a vehicle power supply. The window glass is provided with a temperature detector connected in series to a temperature detection module. The signal output of the temperature detection module is connected to the signal output of a relay control module, and the power output of the relay control module is connected to the heating wire via a relay and a control switch. The relay control module has a 5-second power-on delay. When the vehicle power is reset, the relay control module powers on with a 5-second delay, meaning the heating wire begins heating after a 5-second delay.
[0028] The detector detects the temperature of the car window glass, and the temperature detection module receives the temperature signal from the detector. When the temperature exceeds the set temperature range, it will output an electrical signal to the relay control module, causing the power output end of the relay control module to stop outputting, that is, cutting off the working power of the relay, thereby achieving the purpose of stopping the heating wire from heating.
[0029] The positive pole of the vehicle power supply is connected to the temperature detection module, the contacts of the relay, and the temperature detection module respectively through a DC-DC converter. The power output end of the DC-DC converter is connected to the coil of the relay, and the contacts of the relay are connected to the control switch.
[0030] The vehicle power supply provides power to the electric forklift, supplying +80V to the DC-DC converter and the contacts of the electrical contactor. The DC-DC converter converts the +80V output of the vehicle power supply into +12V, which is used to power the relay control module, relay contacts, and temperature detection module.
[0031] The positive terminal of the vehicle power supply is connected to the DC-DC converter via a key switch and fuse F2. The power output of the DC-DC converter is connected to fuse F3. The positive terminal of the vehicle power supply is connected to the contact of the contactor via fuse F1. In other words, fuse F1 protects the heating wire, fuse F2 protects the DC-DC converter, and fuse F3 protects the contactor.
[0032] In a further solution, a contactor is provided between the control switch and the heating wire, the coil of the contactor is connected to the control switch, and the two ends of the contactor are connected to the vehicle power supply and the heating wire respectively.
[0033] The control switch is connected in parallel with a light emitting diode, which plays a prompting role. When the driver presses the control switch of the heating wire on a certain window glass, it will emit light for display.
[0034] In this embodiment, the detector is preferably a temperature-sensitive resistor, and the corresponding temperature of the vehicle window glass is determined by measuring its resistance value.
[0035] Example 2:
[0036] In this embodiment, all the window glasses (such as the front window, rear window, left window, right window and roof window) of the cab of the electric forklift are installed with heating wires for heating.
[0037] See Figure 1 A delay control system for electrically heated glass includes a heating wire unit 9, a control switch unit 7, and a vehicle power supply 1. Each window glass is provided with a temperature-sensing resistor RC1, RC2, RC3, RC4, and RC5 for detecting the temperature resistance of the glass. The temperature-sensing resistors RC1, RC2, RC3, RC4, and RC5 are connected in series to a temperature detection module 2. When the temperature feedback from any of the temperature-sensing resistors reaches a set threshold (55°C), the output port of the temperature detection module 2 outputs a +12V electrical signal to the relay control module to control it to close.
[0038] The signal output port "out" of the temperature detection module 2 is connected to the signal port "in" of the relay control module 5. The power output port "out" of the relay control module 5 is connected to the heating wire unit 9 via a relay 6, a control switch unit 7, and a contactor unit 8. The relay control module has a 5-second power-on delay. When the vehicle power is reset, the relay control module powers on with a 5-second delay, meaning the heating wire begins heating after a 5-second delay.
[0039] In the heating wire unit 9, the front window heating wire R1, rear window heating wire R2, left window heating wire R3, right window heating wire R4, and roof window heating wire R5 are connected in parallel. The control switch unit 7 includes control switches S31, S32, S33, S34, and S35, and the contactor unit 8 includes five contactors. Each heating wire is connected to a control switch via a contactor, enabling individual control. Specifically, the control switch S31 is connected to the contactor coil K21, one end of the contactor contact S21 is connected to the positive pole of the vehicle power supply 1, and the other end is connected to the front window heating wire R1; the control switch S32 is connected to the contactor coil K22, one end of the contactor contact S22 is connected to the positive pole of the vehicle power supply 1, and the other end is connected to the rear window heating wire R2; the control switch S33 is connected to the contactor coil K23, one end of the contactor contact S23 is connected to the positive pole of the vehicle power supply 1, and the other end is connected to the left window heating wire R3; the control switch S34 is connected to the contactor coil K24, one end of the contactor contact S24 is connected to the positive pole of the vehicle power supply 1, and the other end is connected to the right window heating wire R4; the control switch S35 is connected to the contactor coil K25, one end of the contactor contact S25 is connected to the positive pole of the vehicle power supply 1, and the other end is connected to the top window heating wire R5.
[0040] Vehicle power supply 1 serves as the power source for the electric forklift. It supplies +80V to DC-DC converter 4 and the contactor contacts in contactor unit 8. DC-DC converter 4 converts the +80V into +12V, which is then supplied to relay control module 5, contact S1 of relay 6, and temperature detection module 2. The negative terminal of vehicle power supply 1 is connected to the negative terminal of DC-DC converter 4, relay control module 5, relay 6 coil K1, the negative terminal of the light-emitting diode in control switch unit 7, the negative terminals of contactor coils K21, K22, K23, K24, and K25, and the negative terminals of the front window heating wire R1, rear window heating wire R2, left window heating wire R3, right window heating wire R4, and roof window heating wire R5.
[0041] like Figure 1 As shown, the out port in the relay control module 5 is connected to the coil K1 of the relay 6 to drive the opening and closing of the contact S1 in the relay 6; the output end of the contact S1 of the relay 6 is connected to the control switches S31, S32, S33, S34, and S35 in the control switch unit 7; the switch signal output in the control switch unit 7 is connected to the contactor coil input in the contactor unit 8 to drive the contactor unit 8; the contactor contact output in the contactor unit 8 is connected to the heating wire unit to drive the heating wire. The in1a and in1b ports in the temperature detection module 2 are connected to the temperature-sensing resistor RC1 to detect the temperature of the front window glass; the in2a and in2b ports are connected to the temperature-sensing resistor RC2 to detect the temperature of the rear window glass; the in3a and in3b ports are connected to the temperature-sensing resistor RC3 to detect the temperature of the left window glass; the in4a and in4b ports are connected to the temperature-sensing resistor RC4 to detect the temperature of the right window glass; the in5a and in5b ports are connected to the temperature-sensing resistor RC5 to detect the temperature of the top window glass.
[0042] The "out" port of temperature detection module 2 is connected to the "in" port of relay control module 5, providing an electrical signal to temperature detection module 2 to determine whether to shut down the output of relay control module 5. When temperature detection module 2 detects a temperature of 55°C from any of temperature-sensing resistors RC1, RC2, RC3, RC4, or RC5, the "out" port of temperature detection module 2 outputs a +12V electrical signal to relay control module 5, shutting down its "out" port.
[0043] As in Example 1, the positive electrode of the vehicle power supply 1 is connected to the DC-DC converter 4 via a key switch 3 and fuse F2. The power output of the DC-DC converter 4 is connected to a fuse F3. The positive electrode of the vehicle power supply 1 is connected to the contacts in the contactor unit 8 via fuse F1. Specifically, fuse F1 protects the heating wire, fuse F2 protects the DC-DC converter, and fuse F3 protects the contactor.
[0044] Each control switch is connected in parallel with a light emitting diode (such as Figure 1 LED1, LED2, LED3, LED4, LED5) in the window serve as a reminder. When the driver presses the control switch of the heating wire on a certain window glass, the corresponding light-emitting diode will light up and display.
[0045] The working process of this embodiment is as follows:
[0046] Turn on key switch 3, and DC-DC converter 4 begins operating, providing +12V power. Five seconds after relay control module 5 begins operating, its output port outputs +12V to coil K1 of relay 6, driving contact S1 of relay 6 to close. When any control switch in control switch unit 7 closes, the corresponding contactor coil in its subsequent contactor unit 8 is energized, driving the contactor contacts to close. At this point, the corresponding heating wire in heating wire unit 9 receives +80V and begins heating. If the driver forgets to turn off the control switch, restarting vehicle power supply 1 can delay the activation of the heating wire, preventing the controller from falsely reporting a fault during battery testing. When the driver is working at room temperature and forgets to turn off the control switch, the temperature detection module 2 detects that the temperature feedback from any of the temperature-sensing resistors RC1, RC2, RC3, RC4, and RC5 reaches 55°C, and its output port outputs a +12V electrical signal to the relay control module 5. The relay control module 5 stops the output of the output port, that is, cuts off the power supply of the coil K1 of the relay 6, thereby cutting off the power supply of the control switch unit 7 and the entire subsequent circuit, and the heating wire stops working, ultimately achieving the effect of extending the service life of the glass and saving energy, while achieving the purpose of safe use of the forklift.
[0047] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application are within the scope of protection of the pending claims of the present application.
Claims
1. A delay control system for electrically heated glass used in electric forklifts, comprising a heating wire for heating the window glass, a control switch, and a vehicle power supply, characterized in that: The window glass is provided with a detector for detecting the temperature of the window glass, and the detector is connected in series to the temperature detection module; the signal output end of the temperature detection module is connected to the signal end of the relay control module, and the power output end of the relay control module is connected to the heating wire in sequence through the relay and the control switch. The relay control module has a 5s delayed power-on function.
2. The delay control system according to claim 1, wherein: The positive pole of the vehicle power supply is connected to the temperature detection module, the contacts of the relay, and the temperature detection module respectively through a DC-DC converter. The power output end of the DC-DC converter is connected to the coil of the relay, and the contacts of the relay are connected to the control switch.
3. The delay control system according to claim 2, wherein: The positive pole of the vehicle power supply is connected to the DC-DC converter through the key switch and the fuse F2 respectively, and the power output end of the DC-DC converter is connected to the fuse F3.
4. The delay control system according to claim 1, wherein: A contactor is provided between the control switch and the heating wire. The coil of the contactor is connected to the control switch. The two ends of the contactor are connected to the vehicle power supply and the heating wire respectively.
5. The delay control system according to claim 4, characterized in that: The positive pole of the vehicle power supply is connected to the contact of the contactor through the fuse F1.
6. The delay control system according to claim 1, wherein: The control switch is connected in parallel with a light emitting diode; the detector is a temperature sensing resistor.
7. The delay control system according to claim 4, wherein: The heating wires include a front window heating wire, a rear window heating wire, a left window heating wire, a right window heating wire and a top window heating wire arranged in parallel. Each heating wire is connected to a control switch through a contactor to achieve individual control.