Economical rocker switch control electric defroster system

Abstract

An economical rocker switch control electric defroster system comprises an electric defroster end and a whole vehicle end. The electric defroster end comprises a PTC electric heater, a fan is arranged on one side of the PTC electric heater, and an air outlet pipe is arranged on the other side of the PTC electric heater. The PTC electric heater is connected with a high-voltage electrical interface, and the fan is connected with a low-voltage electrical interface; the whole vehicle end comprises a first rocker switch and a second rocker switch, and the first rocker switch is a rocker switch with an electric heating function and is linked with the fan through a low-voltage relay; the second rocker switch is a wind speed rocker switch. According to the utility model, parts such as the temperature control switch, the NTC temperature sensor, the rocker switch, the low-voltage relay and the like are combined, logic simplification is controlled through function simplification, only the most core part of a user is reserved, and finally, a series of functions of the electric defroster can be controlled only by using the double rocker switch; therefore, the problems that an electric defrosting control system is high in cost, redundant in function, large in size, occupying the space of an instrument desk and the like are solved.

Description

Technical Field

[0001] This utility model relates to defrosters, specifically to an economical rocker switch controlled electric defroster system. Background Technology

[0002] The rise of electric buses represents a significant transformation in the bus industry. However, the persistently high price of high-voltage electric vehicle components, compared to traditional vehicles, remains a major constraint. Therefore, reducing the procurement costs of pure electric vehicles is crucial for enhancing their market competitiveness and market share.

[0003] For conventional electric defrosters, PTC electric heaters are often used. A PTC electric heater is a heating element. When high voltage is applied to it, the body will generate heat. The heat is then blown by a fan onto the windshield or the driver's face and feet vents, achieving the core functions of defrosting and defogging the windshield of commercial buses or heating the driver's area.

[0004] The electric defroster body is connected to the knob panel via an adapter harness. The electric defroster system requires the following inputs from the entire vehicle:

[0005] First, there is a high-voltage power input, which is used to power the PTC electric heater and obtain a heat source. The high-voltage input is obtained from the vehicle battery through the vehicle's multi-in-one high-voltage controller, and the high-voltage power is controlled to be turned on and off through a high-voltage relay.

[0006] Secondly, it provides low-voltage power input for low-voltage components (such as fans, temperature control switches, etc.).

[0007] Three protection measures: A temperature control switch is installed on the PTC electric heater body (the PTC electric heater is a heating element). When the temperature of the PTC electric heater body exceeds 120°C, the high voltage is simultaneously disconnected to achieve the protection function.

[0008] Most conventional electric defrosters use a rotary control panel. The defroster body is connected to the rotary control panel via an adapter cable harness. A schematic diagram is shown below. Figure 1 As shown, the existing knob panel has the following drawbacks:

[0009] 1. High safety requirements lead to high product costs and larger size, occupying dashboard space and failing to support the goal of improving the overall competitiveness of pure electric buses.

[0010] 2. Addressing Design Redundancy: Most defrosters currently in mass production on the market have 4 or 7 speed settings on their knob panels. According to survey data, in winter when there is a significant need for heating or defrosting in the driver's area, over 90% of drivers habitually operate only at the highest speed setting or the maximum defrosting setting. Under normal circumstances, over 70% of drivers habitually operate at a lower speed. These two modes (or states) basically meet the actual needs of drivers. Therefore, a speed setting of 4 is a design redundancy. In actual operation, drivers only habitually use the highest or second-highest speed setting. The 1 / 2 speed setting is too low and does not conform to the actual usage habits of drivers. Utility Model Content

[0011] The technical problem to be solved by this utility model is to provide an economical rocker switch controlled electric defrost system, addressing the issues of high cost and large size of conventional electric defrosters.

[0012] To solve the above problems, this utility model is achieved through the following technical solution:

[0013] An economical rocker switch controlled electric defrost system includes an electric defrost unit end and a vehicle end;

[0014] The electric defroster includes a PTC electric heater, a fan is provided on one side of the PTC electric heater, and an air outlet pipe is provided on the other side of the PTC electric heater; the PTC electric heater is connected to a high-voltage electrical interface, and the fan is connected to a low-voltage electrical interface.

[0015] The vehicle end includes a first rocker switch and a second rocker switch. The first rocker switch is an electric heating function rocker switch and is linked to the fan through a low-voltage relay; the second rocker switch is a fan speed rocker switch.

[0016] Two temperature controllers and an NTC temperature sensor are installed on the PTC electric heater.

[0017] The fan is a DC brushless fan.

[0018] The second rocker switch is connected to the high-end power control switch and the low-end power control switch of the fan, respectively.

[0019] The first rocker switch is connected to the first terminal of the second low-voltage relay. The second terminal of the second low-voltage relay is connected to the temperature controller on the PTC electric heater. The third terminal of the second low-voltage relay is connected to the first low-voltage relay. The first low-voltage relay is connected to the over-temperature fault alarm light, the defrost enable signal, and another temperature controller.

[0020] Compared with existing technologies, this utility model has the following beneficial effects: This utility model combines components such as temperature control switches, NTC temperature sensors, rocker switches, and low-voltage relays, and simplifies the control logic by simplifying functions, retaining only the most core parts for users. Ultimately, it enables the use of a universal double rocker switch to control a series of functions of the electric defroster, such as: turning the electric heating level on or off; high / low fan speed or off, etc., achieving the goal of reducing the overall cost of the electric defroster system by about 20%, thereby solving the problems of high cost, functional redundancy, large size and space occupation of the instrument panel in the electric defrost control system. Attached Figure Description

[0021] Figure 1 Here is a schematic diagram of an existing defroster.

[0022] Figure 2 This is a schematic diagram of the overall principle of this utility model;

[0023] Figure 3 This is a structural diagram of the electric defroster end;

[0024] Figure 4 This is a structural diagram of a PTC electric heater;

[0025] Figure 5 This is a structural diagram of a rocker switch. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] like Figure 2 As shown, an economical rocker switch controlled electric defrost system includes an electric defrost unit end and a vehicle end.

[0029] like Figure 3As shown, the electric defroster includes a PTC electric heater 3. A fan 4 is installed on one side of the PTC electric heater 3, and an air outlet duct 1 is installed on the other side of the PTC electric heater 3. Thus, the air blown out from the fan 4 is heated by the PTC electric heater 3 and then blown out as hot air through the air outlet duct 1. The PTC electric heater 3 is connected to a high-voltage electrical interface 2, and the fan 4 is connected to a low-voltage electrical interface 5.

[0030] Furthermore, the PTC electric heater 3 is connected to the vehicle's high-voltage electrical system via the high-voltage electrical interface 2, which is used to transmit electrical signals and can achieve IP68 level protection.

[0031] like Figure 4 As shown, the PTC electric heater 3 converts high-voltage electrical energy into heat energy. After being powered on, the heater body heats up, and the heat is then blown into the vehicle interior by the fan 4 at the bottom. Two temperature controllers 31 and an NTC temperature sensor 32 are installed on the PTC electric heater 3. When the temperature on the PTC electric heater 3 reaches the set value of the temperature controller 31, the temperature controller 31 automatically disconnects, simultaneously disconnecting the high-voltage potential energy signal via a low-voltage relay, preventing high-voltage output. The NTC temperature sensor 32 is a negative temperature coefficient thermistor, manufactured using ceramic technology with manganese, cobalt, nickel, and copper oxides as the main materials. These metal oxide materials all possess semiconductor properties, as their conductivity is completely similar to that of semiconductor materials such as germanium and silicon. At low temperatures, these oxide materials have fewer charge carriers (electrons and holes), resulting in higher resistance. As the temperature increases, the number of charge carriers increases, thus reducing resistance. The temperature of the PTC body can be determined using the RT curve (thermistor value and temperature gauge curve). Based on the specific temperature information obtained by the NTC temperature sensor, the data is uploaded to the vehicle's CCU controller, enabling automatic monitoring of the defroster's operating status. If the electric defroster malfunctions, the CCU will transmit an abnormal signal and display it on the dashboard to the driver, providing dual protection.

[0032] Fan 4 is a brushless DC fan, mainly composed of a motor, fan shaft, fan blades, and fan housing. It uses a brushless DC motor as the drive source. The motor consists of a stator and a rotor. Several fixed electromagnetic coils are mounted on the stator, and permanent magnets are mounted on the rotor. When low-voltage DC current passes through the stator coils, the generated magnetic field interacts with the permanent magnets on the rotor, producing an electromagnetic force that rotates the rotor. It is also equipped with an electronic speed controller to control the motor speed and achieve high / low speed switching. It should be noted that fan 4 is equipped with a fan controller, which is connected to a fan power negative control switch 41, a fan high-speed power control switch 42, and a fan low-speed power control switch 43.

[0033] like Figure 2 , Figure 5As shown, the vehicle end includes a first rocker switch 6 and a second rocker switch 7. The first rocker switch 6 is for the electric heating function (heating) rocker switch on / off, controlling the heating function and linking it to the fan via a low-voltage relay. Ultimately, the heating function is only allowed to operate when the fan is powered on, thus providing protection. The second rocker switch 7 is a 0-1-2 speed rocker switch, controlling the fan's high speed, low speed, and shutdown functions. The fan can be turned on independently (without heating), enabling natural ventilation in spring and autumn when heating is not needed. It should be noted that the first rocker switch 6 and the second rocker switch 7 are connected to separate power supplies.

[0034] The second rocker switch 7 is connected to the high-speed power control switch 42 and the low-speed power control switch 43 of the fan 4 to realize the switching control of the high and low speeds of the fan.

[0035] The first rocker switch 6 is connected to the first terminal of the second low-pressure relay 8. The second terminal of the second low-pressure relay 8 is connected to the thermostat 31 on the PTC electric heater 3. The third terminal of the second low-pressure relay 8 is connected to the first low-pressure relay 9. The first low-pressure relay 9 is connected to the over-temperature fault alarm light, the defrost enable signal, and another thermostat 31, respectively, thereby protecting (i.e. disconnecting) the high-pressure enable signal. When any temperature switch over-temperature protection is triggered, the thermostat disconnects, and the high-pressure defrost enable signal is simultaneously disconnected through the linkage setting of the two low-pressure relays, thus turning off the heating function.

[0036] After the NTC temperature sensor 32 obtains the specific temperature information, it feeds back the information through the over-temperature fault alarm light or the information displayed on the vehicle's instrument panel, and simultaneously realizes the protection function.

[0037] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. An economical rocker switch controlled electric defroster system, characterized in that: Including the electric defroster end and the vehicle end; The electric defroster includes a PTC electric heater (3), a fan (4) is provided on one side of the PTC electric heater (3), and an air outlet pipe (1) is provided on the other side of the PTC electric heater (3); the PTC electric heater (3) is connected to a high-voltage electrical interface (2), and the fan (4) is connected to a low-voltage electrical interface (5); The vehicle end includes a first rocker switch (6) and a second rocker switch (7). The first rocker switch (6) is an electric heating function rocker switch and is linked with the fan (4) through a low-voltage relay. The second rocker switch (7) is a wind speed rocker switch.

2. The economical rocker switch controlled electric defroster system according to claim 1, characterized in that: Two temperature controllers (31) and an NTC temperature sensor (32) are provided on the PTC electric heater (3).

3. The economical rocker switch controlled electric defroster system according to claim 1, characterized in that: The fan (4) is a DC brushless fan.

4. The economical rocker switch controlled electric defroster system according to claim 1, characterized in that: The second rocker switch (7) is connected to the high-end power control switch (42) and the low-end power control switch (43) of the fan (4).

5. The economical rocker switch controlled electric defroster system according to claim 2, characterized in that: The first rocker switch (6) is connected to the first end of the second low-voltage relay (8), the second end of the second low-voltage relay (8) is connected to the temperature controller (31) on the PTC electric heater (3), the third end of the second low-voltage relay (8) is connected to the first low-voltage relay (9), and the first low-voltage relay (9) is connected to the over-temperature fault alarm light, the defrost enable signal and another temperature controller (31) respectively.

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