阅读说明：本技术 一种适用于车载导航系统的散热系统 (Cooling system suitable for vehicle navigation system ) 是由 詹海涛 于 2020-11-02 设计创作，主要内容包括：本发明提供一种适用于车载导航系统的散热系统,包括金属底座、安装箱体、进风板、出风板、温度感测模块、温度调节模块以及散热监控模块,其中通过四个温度传感器设置在金属底座,能够有效感知车载导航系统的温度信号,通过将四个温度传感器的信号进行融合得到准确的车载导航系统的温度信息,并依据上述温度信息进行温度调节,温度调节模块能够根据需要使用车载空调或外设空调进行温度调节,最后通过散热监控模块监测实时温度信息和气体流速信号,以使得降温散热的气体能够对车载导航系统进行有效、均匀的降温。(The invention provides a heat dissipation system suitable for a vehicle-mounted navigation system, which comprises a metal base, an installation box body, an air inlet plate, an air outlet plate, a temperature sensing module, a temperature adjusting module and a heat dissipation monitoring module, wherein four temperature sensors are arranged on the metal base, so that temperature signals of the vehicle-mounted navigation system can be effectively sensed, accurate temperature information of the vehicle-mounted navigation system can be obtained by fusing the signals of the four temperature sensors, temperature adjustment can be carried out according to the temperature information, the temperature adjusting module can carry out temperature adjustment by using a vehicle-mounted air conditioner or an external air conditioner as required, and finally, real-time temperature information and gas flow rate signals are monitored by the heat dissipation monitoring module, so that the cooled and dissipated gas can effectively and uniformly cool the vehicle-mounted navigation system.)

1. A heat dissipation system suitable for a vehicle-mounted navigation system is characterized by comprising a metal base (2), an installation box body (3), an air inlet plate (4) and an air outlet plate (5);

the navigation system main body (1) is fixedly arranged on the metal base (2) through a back plate of the navigation system main body, the size of the metal base (2) is consistent with that of the back plate of the navigation system main body (1), the metal base (2) is fixedly arranged on the side wall of the installation box body (3), the air inlet plate (4) is arranged on the upper surface of the installation box body (3), the air outlet plate (5) is arranged on the lower surface of the installation box body (3), the air inlet plate (4) and the air outlet plate (5) are both provided with a plurality of ventilation holes, and each ventilation hole is provided with an electromagnetic valve;

the heat dissipation system further comprises a temperature sensing module, the temperature sensing module comprises a first temperature sensor (6), a second temperature sensor (7), a third temperature sensor (8) and a fourth temperature sensor (9), the first temperature sensor (6), the second temperature sensor (7), the third temperature sensor (8) and the fourth temperature sensor (9) are uniformly arranged at each corner of the periphery of the metal base (2), the temperature sensing module further comprises a temperature fusion unit, a temperature comparison unit and a first trigger unit, the first temperature sensor (6), the second temperature sensor (7), the third temperature sensor (8) and the fourth temperature sensor (9) are all connected with the temperature fusion unit, the temperature fusion unit and the temperature comparison unit are sequentially connected with the first trigger unit, the temperature fusion unit fuses temperature signals collected by the first temperature sensor (6), the second temperature sensor (7), the third temperature sensor (8) and the fourth temperature sensor (9), and transmits the fused signals to the temperature comparison unit, a temperature threshold is stored in the temperature comparison unit, and if the signals received by the temperature comparison unit exceed the temperature threshold, the first trigger unit sends out a first trigger signal;

the cooling system further comprises a temperature adjusting module, the temperature adjusting module comprises a monitoring unit and a second triggering unit, the monitoring unit starts to detect whether the refrigeration function of the vehicle-mounted air conditioner is started or not after receiving a first triggering signal, if yes, the monitoring unit opens electromagnetic valves in each ventilation hole on the air inlet plate (4) and the air outlet plate (5) and transmits gas generated by the vehicle-mounted air conditioner to the air inlet plate (4), and if not, the monitoring unit opens the electromagnetic valves in each ventilation hole on the air inlet plate (4) and the air outlet plate (5) and transmits gas generated by an external air conditioner to the air inlet plate (4); meanwhile, the monitoring unit controls the second trigger unit to send a second trigger signal;

the heat dissipation system further comprises a heat dissipation monitoring module, the heat dissipation monitoring module comprises a fifth temperature sensor (10), a gas flow velocity sensor, a signal processing circuit and a control unit, the fifth temperature sensor (10) is arranged at the central position of the metal base (2) and used for monitoring the temperature signal of the navigation system main body (1) and transmitting the collected temperature signal to the signal processing circuit, the signal processing circuit transmits the received signal to the control unit, the gas flow velocity sensor is arranged in the installation box body (3) and used for monitoring the gas flow velocity signal in the installation box body (3) and transmitting the collected gas flow velocity signal to the control unit, a temperature standard value is stored in the control unit, and if the temperature signal received by the control unit is smaller than the temperature standard value, the control unit sends a closing control signal to the monitoring unit, when the monitoring unit receives the closing monitoring signal, if the monitoring unit adopts a vehicle-mounted air conditioner to adjust the temperature, the monitoring unit is closed to open the electromagnetic valves in the air holes on the air inlet plate (4) and the air outlet plate (5), and if the monitoring unit adopts an external air conditioner to adjust the temperature, the monitoring unit is closed to open the electromagnetic valves in the air holes on the air inlet plate (4) and the air outlet plate (5) and the external air conditioner; the control unit is internally stored with a gas flow velocity standard value, if the gas flow velocity signal received by the control unit is greater than the gas flow velocity standard value, then the control unit sends a gas speed reduction control signal to the monitoring unit, when the monitoring unit receives the gas speed reduction control signal, if the temperature of the vehicle-mounted air conditioner is adjusted at the moment, the monitoring unit is closed, the electromagnetic valve in the air inlet plate (4) and the upper part air vent of the air outlet plate (5) is opened by the monitoring unit, and if the temperature of the peripheral air conditioner is adjusted at the moment, the wind speed of the peripheral air conditioner is reduced.

2. The heat dissipation system suitable for vehicle navigation system of claim 1, wherein the air inlet plate (4) is provided with n ventilation holes, the air outlet plate (5) is provided with m ventilation holes, wherein m < n, and the axis of any ventilation hole provided on the air inlet plate (4) and any ventilation hole provided on the air outlet plate (5) are not collinear.

3. The heat dissipation system suitable for vehicle navigation system according to claim 1, wherein the first temperature sensor (6), the second temperature sensor (7), the third temperature sensor (8) and the fourth temperature sensor (9) are all connected to the temperature fusion unit, and the temperature fusion unit performs fusion processing on the temperature signals collected by the first temperature sensor (6), the second temperature sensor (7), the third temperature sensor (8) and the fourth temperature sensor (9) as follows:

step S1: at time t, the temperature signal collected by the first temperature sensor (6) is a (t), the temperature signal collected by the second temperature sensor (7) is b (t), the temperature signal collected by the third temperature sensor (8) is c (t), and the temperature signal collected by the fourth temperature sensor (9) is d (t);

step S2: the distance between the first temperature sensor (6) and the center of the metal base (2) is L1, the distance between the second temperature sensor (7) and the center of the metal base (2) is L2, the distance between the third temperature sensor (8) and the center of the metal base (2) is L3, the distance between the fourth temperature sensor (9) and the center of the metal base (2) is L4, the side length of the longest side of the metal base (2) is Lmax, the shortest side length of the metal base (2) is Lmin, and the temperature fusion unit performs weight calculation according to the distances between the first temperature sensor (6), the second temperature sensor (7), the third temperature sensor (8) and the fourth temperature sensor (9) and the metal base (2), specifically as follows:

wherein a is a weight of the first temperature sensor (6), b is a weight of the second temperature sensor (7), c is a weight of the third temperature sensor (8), and d is a weight of the fourth temperature sensor (9);

step S3: calculating a fusion function T (t) having

Step S4: the magnitude of the fusion function t (t) is taken as a fusion parameter.

4. The heat dissipation system suitable for the vehicle navigation system, according to claim 1, wherein the signal processing circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a third capacitor C3 and an operational amplifier A1;

wherein an output end of the fifth temperature sensor (10) is connected to one end of the second resistor R2, one end of the first resistor R1 is connected to a +2.5V power supply, the other end of the first resistor R1 is connected to an inverting input end of the operational amplifier a1, one end of the third resistor R3 is grounded, the other end of the third resistor R3 is connected to the other end of the second resistor R2, the other end of the second resistor R2 is connected to a non-inverting input end of the operational amplifier a1, one end of the fourth resistor R4 is connected to the other end of the first resistor R1, one end of the first capacitor C1 is connected to the other end of the first resistor R1, the other end of the first capacitor C1 is connected to an output end of the operational amplifier a source terminal 1, a positive terminal of the operational amplifier a1 is connected to one end of the second capacitor C2, and the other end of the second capacitor C2 is grounded, the positive power supply end of the operational amplifier A1 is connected with a power supply Vcc, the negative power supply end of the operational amplifier A1 is grounded, one end of a fifth resistor R5 is connected with the output end of the operational amplifier A1, the other end of the fifth resistor R5 is connected with the other end of a fourth resistor R4, one end of a third capacitor C3 is grounded, the other end of the third capacitor C3 is connected with the other end of the fifth resistor R5, one end of a sixth resistor R6 is grounded, the other end of the sixth resistor R6 is connected with the other end of the fifth resistor R5, and the output end of the fifth resistor R5 is connected with the input end of the control unit.

5. The heat dissipation system suitable for the vehicle-mounted navigation system as claimed in claim 1, wherein the external air conditioner is a refrigeration cycle fan, the monitoring unit is connected to the refrigeration cycle fan, and the monitoring unit controls the air speed of the refrigeration cycle fan according to the control signal of the control unit.

6. The heat dissipation system suitable for vehicle navigation system as set forth in claim 1, further comprising an input device, wherein the input device is connected to the temperature comparison unit and the control unit, the input device inputs the temperature threshold value to the temperature comparison unit, and the input device inputs the temperature standard value and the gas flow rate standard value to the control unit.

7. The heat dissipation system for a vehicle navigation system according to claim 1, the heat dissipation system also comprises a timing unit, a timing comparison unit and an alarm unit, wherein the input end of the timing unit is connected with the first trigger unit, the input unit of the timing unit is also connected with the control unit, the timing unit starts timing after receiving a first trigger signal sent by the first trigger unit, the timing unit stops timing when receiving the closing control signal sent by the detection unit, after timing is stopped, the timing unit transmits timing data to the timing comparison unit, a time threshold value is stored in the timing comparison unit, and if the timing data received by the timing comparison unit is larger than the time threshold value, the timing comparison unit controls the alarm unit to send out an alarm signal.

Technical Field

The invention relates to the field of vehicle navigation, in particular to a heat dissipation system suitable for a vehicle navigation system.

Background

The heat radiator is an indispensable component in the instrument, as is known, the instrument generates heat during operation, and in general, the instrument is provided with a protection device such as a shell, and in this case, the temperature of the instrument during operation is not easy to radiate, which causes the internal temperature of the instrument to be too high, and when the temperature exceeds the service temperature of a certain component in the instrument, the instrument will break down, and therefore, the instrument needs to be subjected to heat radiation treatment when in use.

The vehicle-mounted navigation equipment comprises an antenna, a control device, a display device, a storage device and the like, and the navigation system needs to continuously exchange data with the satellite system during operation so as to update navigation information in real time.

However, in the prior art, the heat dissipation effect of the vehicle-mounted navigation system is not good, and the problem of uneven heat dissipation is easily caused, that is, the temperature of the main body of the navigation system may not be reduced to an ideal state, and the heat dissipation system stops working, on the other hand, there are many precise components in the navigation system, and all the components are devices greatly affected by the temperature, such as patches in antenna equipment, on the basis, the temperature in the navigation system needs to be monitored and controlled with high precision, otherwise, the navigation system fails, and the use is affected.

Disclosure of Invention

Therefore, in order to overcome the above problems, the present invention provides a heat dissipation system for a car navigation system, which includes a metal base, a mounting box, an air inlet plate and an air outlet plate.

Wherein, the navigation main part is fixed through its backplate and is set up on the metal base, the size of metal base with the backplate size of navigation main part is unanimous, the metal base is fixed to be set up the lateral wall of installation box, the upper surface of installation box is provided with the air inlet plate, the lower surface of installation box is provided with out the tuber plate, the air inlet plate with it all is provided with a plurality of ventilation hole to go out the tuber plate, all is provided with the solenoid valve in each ventilation hole.

Specifically, cooling system still includes a temperature sensing module, temperature sensing module includes first temperature sensor, second temperature sensor, third temperature sensor and fourth temperature sensor, first temperature sensor second temperature sensor third temperature sensor and fourth temperature sensor evenly set up on each angle all around of metal base, temperature sensing module still includes temperature fusion unit, temperature comparing unit and first trigger unit, first temperature sensor second temperature sensor third temperature sensor and fourth temperature sensor all with the temperature fusion unit is connected, the temperature fusion unit the temperature comparing unit with first trigger unit connects gradually, the temperature fusion unit is right first temperature sensor, the temperature fusion unit is right, The temperature signals collected by the second temperature sensor, the third temperature sensor and the fourth temperature sensor are subjected to fusion processing, the signals subjected to fusion processing are transmitted to the temperature comparison unit, a temperature threshold value is stored in the temperature comparison unit, and if the signals received by the temperature comparison unit exceed the temperature threshold value, the first trigger unit sends out a first trigger signal.

Specifically, the heat dissipation system further comprises a temperature regulation module, the temperature regulation module comprises a monitoring unit and a second trigger unit, the monitoring unit starts to detect whether the refrigeration function of the vehicle-mounted air conditioner is started or not after receiving a first trigger signal, if so, the monitoring unit opens electromagnetic valves in the air holes on the air inlet plate and the air outlet plate and transmits gas generated by the vehicle-mounted air conditioner to the air inlet plate, and otherwise, the monitoring unit opens the electromagnetic valves in the air holes on the air inlet plate and the air outlet plate and transmits gas generated by an external air conditioner to the air inlet plate; meanwhile, the monitoring unit controls the second trigger unit to send a second trigger signal.

Specifically, the heat dissipation system further includes a heat dissipation monitoring module, the heat dissipation monitoring module includes a fifth temperature sensor, a gas flow rate sensor, a signal processing circuit and a control unit, the fifth temperature sensor is disposed at the central position of the metal base and is configured to monitor a temperature signal of the navigation system main body and transmit a collected temperature signal to the signal processing circuit, the signal processing circuit transmits a received signal to the control unit, the gas flow rate sensor is disposed in the installation box and is configured to monitor a gas flow rate signal in the installation box and transmit a collected gas flow rate signal to the control unit, a temperature standard value is stored in the control unit, and if the temperature signal received by the control unit is smaller than the temperature standard value, the control unit transmits a closing control signal to the monitoring unit, when the monitoring unit receives a closing monitoring signal, if the vehicle-mounted air conditioner is adopted for temperature adjustment at the moment, the monitoring unit is closed to open the electromagnetic valves in the air inlet plate and the air outlet plate, and if the external air conditioner is adopted for temperature adjustment at the moment, the monitoring unit is closed to open the electromagnetic valves in the air inlet plate and the air outlet plate and the external air conditioner; the control unit is internally stored with a gas flow velocity standard value, if the gas flow velocity signal received by the control unit is greater than the gas flow velocity standard value, the control unit sends a gas deceleration control signal to the monitoring unit, when the monitoring unit receives the gas deceleration control signal, if the monitoring unit adopts the vehicle-mounted air conditioner to carry out temperature regulation at the moment, the monitoring unit is closed, the monitoring unit opens the electromagnetic valve in the air inlet plate and the upper part of the air outlet plate, and if the peripheral air conditioner is adopted to carry out temperature regulation at the moment, the air speed of the peripheral air conditioner is reduced.

Specifically, be provided with n ventilation holes on the air inlet plate, be provided with m ventilation holes on the play aerofoil, wherein, m < n, and set up in arbitrary ventilation hole on the air inlet plate with the axis in arbitrary ventilation hole on the play aerofoil is all collineates.

Specifically, the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor are all connected to the temperature fusion unit, and the temperature fusion unit performs fusion processing on the temperature signals collected by the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor as follows:

step S1: at time t, the temperature signal collected by the first temperature sensor is a (t), the temperature signal collected by the second temperature sensor is b (t), the temperature signal collected by the third temperature sensor is c (t), and the temperature signal collected by the fourth temperature sensor is d (t).

Step S2: the distance between the first temperature sensor and the center of the metal base is L1, the distance between the second temperature sensor and the center of the metal base is L2, the distance between the third temperature sensor and the center of the metal base is L3, the distance between the fourth temperature sensor and the center of the metal base is L4, the side length of the longest side of the metal base is Lmax, the shortest side length of the metal base is Lmin, and the temperature fusion unit performs weight calculation according to the distances from the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor to the metal base, specifically as follows:

wherein a is a weight of the first temperature sensor, b is a weight of the second temperature sensor, c is a weight of the third temperature sensor, and d is a weight of the fourth temperature sensor.

Step S3: calculating a fusion function T (t) having

Step S4: the magnitude of the fusion function t (t) is taken as a fusion parameter.

Specifically, the signal processing circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a third capacitor C3 and an operational amplifier A1.

Wherein, the output end of the fifth temperature sensor is connected with one end of the second resistor R2, one end of the first resistor R1 is connected with a +2.5V power supply, the other end of the first resistor R1 is connected with the inverting input end of the operational amplifier a1, one end of the third resistor R3 is grounded, the other end of the third resistor R3 is connected with the other end of the second resistor R2, the other end of the second resistor R2 is connected with the non-inverting input end of the operational amplifier a1, one end of the fourth resistor R4 is connected with the other end of the first resistor R1, one end of the first capacitor C1 is connected with the other end of the first resistor R1, the other end of the first capacitor C1 is connected with the output end of the operational amplifier a1, the positive electrode of the operational amplifier a1 is connected with one end of the second capacitor C2, and the other end of the second capacitor C2 is grounded, the positive power supply end of the operational amplifier A1 is connected with a power supply Vcc, the negative power supply end of the operational amplifier A1 is grounded, one end of a fifth resistor R5 is connected with the output end of the operational amplifier A1, the other end of the fifth resistor R5 is connected with the other end of a fourth resistor R4, one end of a third capacitor C3 is grounded, the other end of the third capacitor C3 is connected with the other end of the fifth resistor R5, one end of a sixth resistor R6 is grounded, the other end of the sixth resistor R6 is connected with the other end of the fifth resistor R5, and the output end of the fifth resistor R5 is connected with the input end of the control unit.

Specifically, the external air conditioner is a refrigeration cycle fan, the monitoring unit is connected with the refrigeration cycle fan, and the monitoring unit controls the air speed of the refrigeration cycle fan according to the control signal of the control unit.

Specifically, the heat dissipation system further comprises an input device, the input device is connected with the temperature comparison unit and the control unit, the input device inputs a temperature threshold value to the temperature comparison unit, and the input device inputs a temperature standard value and a gas flow rate standard value to the control unit.

Specifically, the heat dissipation system further comprises a timing unit, a timing comparison unit and an alarm unit, wherein an input end of the timing unit is connected with the first trigger unit, an input unit of the timing unit is further connected with the control unit, the timing unit starts timing after receiving a first trigger signal sent by the first trigger unit, the timing unit stops timing when receiving a closing control signal sent by the detection unit, the timing unit transmits timing data to the timing comparison unit after stopping timing, a time threshold value is stored in the timing comparison unit, and if the timing data received by the timing comparison unit is greater than the time threshold value, the timing comparison unit controls the alarm unit to send an alarm signal.

Compared with the prior art, the invention has the following beneficial effects:

the invention provides a heat dissipation system suitable for a vehicle-mounted navigation system, which comprises a metal base, an installation box body, an air inlet plate, an air outlet plate, a temperature sensing module, a temperature adjusting module and a heat dissipation monitoring module, wherein four temperature sensors are arranged on the metal base, so that temperature signals of the vehicle-mounted navigation system can be effectively sensed, accurate temperature information of the vehicle-mounted navigation system can be obtained by fusing the signals of the four temperature sensors, temperature adjustment can be carried out according to the temperature information, the temperature adjusting module can carry out temperature adjustment by using a vehicle-mounted air conditioner or an external air conditioner as required, and finally, real-time temperature information and gas flow rate signals are monitored by the heat dissipation monitoring module, so that the cooled and dissipated gas can effectively and uniformly cool the vehicle-mounted navigation system. The heat dissipation system further comprises a timing unit, a timing comparison unit and an alarm unit, wherein the timing unit is used for testing the time during heat dissipation operation, and if the heat dissipation time is larger than a preset time threshold value, the alarm unit sends alarm information to prompt the heat dissipation system to have a fault.

The invention also has the advantages that the air inlet plate and the air outlet plate are both provided with vent holes, the number of the vent holes arranged on the air inlet plate is larger than that of the air outlet plate, so that the temperature-regulated gas can quickly enter the installation box body, the residence time in the installation box body is longer, meanwhile, the axial lines of any vent hole arranged on the air inlet plate and any vent hole on the air outlet plate are not collinear, and the design can ensure that the temperature-regulated gas is more uniform in the installation box body.

Drawings

FIG. 1 is a schematic diagram of a heat dissipation system suitable for use in a vehicle navigation system according to the present invention;

FIG. 2 is a schematic view of a metal base of the heat dissipation system for a vehicle navigation system according to the present invention;

FIG. 3 is a schematic diagram of a temperature sensing module of a heat dissipation system for a car navigation system according to the present invention;

FIG. 4 is a schematic diagram of a temperature adjustment module of a heat dissipation system for a vehicle navigation system according to the present invention;

FIG. 5 is a schematic diagram of a heat dissipation monitoring module of a heat dissipation system for a vehicle navigation system according to the present invention;

fig. 6 is a circuit diagram of a signal processing circuit suitable for a car navigation system according to the present invention.

Reference numerals: the method comprises the following steps of 1-a navigation system main body, 2-a metal base, 3-an installation box body, 4-an air inlet plate, 5-an air outlet plate, 6-a first temperature sensor, 7-a second temperature sensor, 8-a third temperature sensor, 9-a fourth temperature sensor and 10-a fifth temperature sensor.

Detailed Description

The following describes the heat dissipation system suitable for the car navigation system in detail with reference to the accompanying drawings and embodiments.

As shown in fig. 1, the heat dissipation system suitable for the car navigation system provided by the invention comprises a metal base (2), an installation box body (3), an air inlet plate (4) and an air outlet plate (5).

Wherein, navigation system main part (1) is in through the fixed setting of its backplate on metal base (2), the size of metal base (2) with the backplate size of navigation system main part (1) is unanimous, metal base (2) are fixed to be set up the lateral wall of installation box (3), the upper surface of installation box (3) is provided with air inlet plate (4), the lower surface of installation box (3) is provided with out aerofoil (5), air inlet plate (4) with it all is provided with a plurality of ventilation hole to go out aerofoil (5), all is provided with the solenoid valve in each ventilation hole.

As shown in fig. 2-3, the heat dissipation system further includes a temperature sensing module, the temperature sensing module includes a first temperature sensor (6), a second temperature sensor (7), a third temperature sensor (8) and a fourth temperature sensor (9), the first temperature sensor (6), the second temperature sensor (7), the third temperature sensor (8) and the fourth temperature sensor (9) are uniformly disposed at each corner of the metal base (2), the temperature sensing module further includes a temperature fusion unit, a temperature comparison unit and a first trigger unit, the first temperature sensor (6), the second temperature sensor (7), the third temperature sensor (8) and the fourth temperature sensor (9) are all connected to the temperature fusion unit, and the temperature fusion unit, The temperature comparing unit with first trigger unit connects gradually, the temperature fusion unit is right first temperature sensor (6), second temperature sensor (7), third temperature sensor (8) and the temperature signal that fourth temperature sensor (9) gathered fuses the processing to with fuse the signal transmission after handling extremely the temperature comparing unit, the storage has a temperature threshold value in the temperature comparing unit, if the signal that the temperature comparing unit received exceeds the temperature threshold value, then first trigger unit sends first trigger signal.

As shown in fig. 4, the heat dissipation system further includes a temperature adjustment module, where the temperature adjustment module includes a monitoring unit and a second trigger unit, the monitoring unit starts to detect whether a refrigeration function of the vehicle-mounted air conditioner is started after receiving a first trigger signal, if so, the monitoring unit opens electromagnetic valves in respective vent holes on the air inlet plate (4) and the air outlet plate (5), and transmits gas generated by the vehicle-mounted air conditioner to the air inlet plate (4), otherwise, the monitoring unit opens the electromagnetic valves in the vent holes on the air inlet plate (4) and the air outlet plate (5), and transmits gas generated by an external air conditioner to the air inlet plate (4); meanwhile, the monitoring unit controls the second trigger unit to send a second trigger signal.

As shown in fig. 5, the heat dissipation system further includes a heat dissipation monitoring module, the heat dissipation monitoring module includes a fifth temperature sensor (10), a gas flow rate sensor, a signal processing circuit and a control unit, the fifth temperature sensor (10) is disposed at a central position of the metal base (2) and is configured to monitor a temperature signal of the navigation system main body (1) and transmit the collected temperature signal to the signal processing circuit, the signal processing circuit transmits the received signal to the control unit, the gas flow rate sensor is disposed in the installation box (3) and is configured to monitor a gas flow rate signal in the installation box (3) and transmit the collected gas flow rate signal to the control unit, a temperature standard value is stored in the control unit, and if the temperature signal received by the control unit is smaller than the temperature standard value, the control unit sends a closing control signal to the monitoring unit, when the monitoring unit receives the closing monitoring signal, if the monitoring unit adopts a vehicle-mounted air conditioner to adjust the temperature, the monitoring unit is closed to open the electromagnetic valves in the air holes on the air inlet plate (4) and the air outlet plate (5), and if the monitoring unit adopts an external air conditioner to adjust the temperature, the monitoring unit is closed to open the electromagnetic valves in the air holes on the air inlet plate (4) and the air outlet plate (5) and the external air conditioner; the control unit is internally stored with a gas flow velocity standard value, if the gas flow velocity signal received by the control unit is greater than the gas flow velocity standard value, then the control unit sends a gas speed reduction control signal to the monitoring unit, when the monitoring unit receives the gas speed reduction control signal, if the temperature of the vehicle-mounted air conditioner is adjusted at the moment, the monitoring unit is closed, the electromagnetic valve in the air inlet plate (4) and the upper part air vent of the air outlet plate (5) is opened by the monitoring unit, and if the temperature of the peripheral air conditioner is adjusted at the moment, the wind speed of the peripheral air conditioner is reduced.

In the above embodiment, the heat dissipation system suitable for the vehicle-mounted navigation system provided by the invention comprises a metal base, an installation box, an air inlet plate, an air outlet plate, a temperature sensing module, a temperature adjusting module and a heat dissipation monitoring module, wherein four temperature sensors are arranged on the metal base, so that temperature signals of the vehicle-mounted navigation system can be effectively sensed, accurate temperature information of the vehicle-mounted navigation system can be obtained by fusing signals of the four temperature sensors, temperature adjustment can be performed according to the temperature information, the temperature adjusting module can perform temperature adjustment by using a vehicle-mounted air conditioner or an external air conditioner as required, and finally, real-time temperature information and gas flow rate signals are monitored by the heat dissipation monitoring module, so that the cooled gas can effectively and uniformly cool the vehicle-mounted navigation system.

Preferably, be provided with n ventilation holes on the air inlet plate (4), be provided with m ventilation holes on the air-out plate (5), wherein, m < n, and set up in arbitrary ventilation hole on the air inlet plate (4) with the axis in arbitrary ventilation hole on the air-out plate (5) is all collineation not all.

Among the above-mentioned embodiment, all be provided with the ventilation hole on air inlet plate (4) and the play wind board (5), the quantity in the ventilation hole that sets up on air inlet plate (4) is greater than the quantity of play wind board (5), can make temperature regulation's gas get into installation box (3) rapidly in, and dwell time is longer in installation box (3), simultaneously, set up in the air inlet plate (4) arbitrary ventilation hole and the play wind board (5) on the axis of arbitrary ventilation hole all not collinear, so design, can make temperature regulation's gas more even in installation box (3).

Preferably, the first temperature sensor (6), the second temperature sensor (7), the third temperature sensor (8) and the fourth temperature sensor (9) are all connected to the temperature fusion unit, and the temperature fusion unit performs fusion processing on the temperature signals acquired by the first temperature sensor (6), the second temperature sensor (7), the third temperature sensor (8) and the fourth temperature sensor (9) as follows:

step S1: at time t, the temperature signal collected by the first temperature sensor (6) is a (t), the temperature signal collected by the second temperature sensor (7) is b (t), the temperature signal collected by the third temperature sensor (8) is c (t), and the temperature signal collected by the fourth temperature sensor (9) is d (t).

Step S2: the distance between the first temperature sensor (6) and the center of the metal base (2) is L1, the distance between the second temperature sensor (7) and the center of the metal base (2) is L2, the distance between the third temperature sensor (8) and the center of the metal base (2) is L3, the distance between the fourth temperature sensor (9) and the center of the metal base (2) is L4, the side length of the longest side of the metal base (2) is Lmax, the shortest side length of the metal base (2) is Lmin, and the temperature fusion unit performs weight calculation according to the distances between the first temperature sensor (6), the second temperature sensor (7), the third temperature sensor (8) and the fourth temperature sensor (9) and the metal base (2), specifically as follows:

wherein a is a weight of the first temperature sensor (6), b is a weight of the second temperature sensor (7), c is a weight of the third temperature sensor (8), and d is a weight of the fourth temperature sensor (9).

Step S3: calculating a fusion function T (t) having

Step S4: the magnitude of the fusion function t (t) is taken as a fusion parameter.

As shown in fig. 6, the signal processing circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a third capacitor C3, and an operational amplifier a 1.

Wherein an output end of the fifth temperature sensor (10) is connected to one end of the second resistor R2, one end of the first resistor R1 is connected to a +2.5V power supply, the other end of the first resistor R1 is connected to an inverting input end of the operational amplifier a1, one end of the third resistor R3 is grounded, the other end of the third resistor R3 is connected to the other end of the second resistor R2, the other end of the second resistor R2 is connected to a non-inverting input end of the operational amplifier a1, one end of the fourth resistor R4 is connected to the other end of the first resistor R1, one end of the first capacitor C1 is connected to the other end of the first resistor R1, the other end of the first capacitor C1 is connected to an output end of the operational amplifier a source terminal 1, a positive terminal of the operational amplifier a1 is connected to one end of the second capacitor C2, and the other end of the second capacitor C2 is grounded, the positive power supply end of the operational amplifier A1 is connected with a power supply Vcc, the negative power supply end of the operational amplifier A1 is grounded, one end of a fifth resistor R5 is connected with the output end of the operational amplifier A1, the other end of the fifth resistor R5 is connected with the other end of a fourth resistor R4, one end of a third capacitor C3 is grounded, the other end of the third capacitor C3 is connected with the other end of the fifth resistor R5, one end of a sixth resistor R6 is grounded, the other end of the sixth resistor R6 is connected with the other end of the fifth resistor R5, and the output end of the fifth resistor R5 is connected with the input end of the control unit.

In the above embodiment, the model of the operational amplifier a1 is RC 4558D.

Preferably, the external air conditioner is a refrigeration cycle fan, the monitoring unit is connected with the refrigeration cycle fan, and the monitoring unit controls the air speed of the refrigeration cycle fan according to the control signal of the control unit.

Preferably, the heat dissipation system further comprises an input device, the input device is connected with the temperature comparison unit and the control unit, the input device inputs a temperature threshold value to the temperature comparison unit, and the input device inputs a temperature standard value and a gas flow rate standard value to the control unit.

Preferably, the heat dissipation system further includes a timing unit, a timing comparison unit and an alarm unit, an input end of the timing unit is connected to the first trigger unit, an input unit of the timing unit is further connected to the control unit, the timing unit starts timing after receiving a first trigger signal sent by the first trigger unit, the timing unit stops timing when receiving a closing control signal sent by the detection unit, the timing unit transmits timing data to the timing comparison unit after stopping timing, a time threshold is stored in the timing comparison unit, and if the timing data received by the timing comparison unit is greater than the time threshold, the timing comparison unit controls the alarm unit to send an alarm signal.

In the above embodiment, the heat dissipation system further includes a timing unit, a timing comparison unit, and an alarm unit, where the timing unit is configured to test time during heat dissipation operation, and if the heat dissipation time is greater than a preset time threshold, the alarm unit sends alarm information to prompt a failure of the heat dissipation system.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.