CN220764090U

CN220764090U - Commercial vehicle heat management control circuit and device and commercial vehicle

Info

Publication number: CN220764090U
Application number: CN202322371310.1U
Authority: CN
Inventors: 何玉昆; 杨廷宇; 李丽; 游宇
Original assignee: Hangzhou Lingdong Automobile Thermal Management Technology Co ltd
Current assignee: Hangzhou Lingdong Automobile Thermal Management Technology Co ltd
Priority date: 2023-08-31
Filing date: 2023-08-31
Publication date: 2024-04-12
Anticipated expiration: 2033-08-31

Abstract

The utility model discloses a thermal management control circuit and device for a commercial vehicle and the commercial vehicle, wherein the circuit comprises a voltage sampling module, an enabling control module, a buck conversion module and a plurality of loads connected with the buck conversion module, wherein the voltage sampling module, the enabling control module and the buck conversion module are respectively connected with a low-voltage platform of the commercial vehicle; enabling the control module to control the working state of the buck conversion module according to the output voltage of the commercial vehicle low-voltage platform sampled by the voltage sampling module; the buck conversion module comprises a voltage regulating unit, a voltage conversion controller, a voltage feedback unit and a switch control unit; the voltage conversion controller controls the working state of the switch control unit according to the comparison between the output voltage of the voltage conversion controller which is regulated and set by the voltage regulating unit and the output voltage of the voltage conversion controller which is collected and fed back by the voltage feedback unit, so that the output voltage which is regulated to be actually output reaches the set output voltage. This allows the commercial vehicle to be compatible with the output 12V even with the existing 24V.

Description

Commercial vehicle heat management control circuit and device and commercial vehicle

Technical Field

The utility model relates to the technical field of commercial vehicles, in particular to a thermal management control circuit and device for a commercial vehicle and the commercial vehicle.

Background

With the increasing requirements of environmental protection and energy conservation, new energy automobiles gradually become the development trend of the automobile industry. New energy automobiles generally use a battery as a power source, and thus it is necessary to effectively manage the temperature of the battery to ensure the performance and life of the battery. The thermal management system is an important component for realizing the temperature control of the battery, and it realizes the heating or cooling of the battery by adjusting the flow and temperature of the coolant or refrigerant.

At present, a heat management system of a new energy automobile of a commercial vehicle is more and more complex, and particularly, a heat pump system and a battery cooling system with double compressors and large refrigerating capacity are adopted to improve the heat efficiency and adapt to different working conditions. These systems require the use of a variety of external actuators to control the flow and pressure of the coolant or refrigerant, such as large-bore electronic expansion valves, multi-way electronic water valves, electric compressors, and the like. These external actuators typically require the use of a DC 12V low voltage power supply to drive.

With the rapid development of new energy automobiles of commercial vehicles, the technology of a thermal management system, in particular to a heat pump system and a battery cooling system with double compressors and large refrigerating capacity, is more and more complex, and mainly comprises used external actuators such as large-caliber electronic expansion valves, multi-pass electronic water valves, electric compressors and other parts.

However, in the prior art, commercial vehicles can only use DC 24V low voltage power supply, which causes the following problems: in the aspect of related actuator products of DC 24V low-voltage power supply of commercial vehicles, the supply quantity is small, the cost is high, the quality is unstable, and the requirements of a thermal management system on the performance and the reliability of the actuator are difficult to meet.

Disclosure of Invention

The embodiment of the utility model provides a heat management control circuit for a commercial vehicle.

The utility model relates to a heat management control circuit of a commercial vehicle, which comprises a voltage sampling module, an enabling control module, a buck conversion module and a plurality of loads, wherein the voltage sampling module, the enabling control module and the buck conversion module are respectively connected with a commercial vehicle low-voltage power platform;

the enabling control module is also respectively connected with the voltage sampling module and the buck conversion module and is used for correspondingly controlling the working state of the buck conversion module according to the output voltage of the commercial vehicle low-voltage platform sampled by the voltage sampling module;

the buck conversion module comprises a voltage regulation unit and a voltage conversion controller which are connected with a low-voltage platform of the commercial vehicle, and a voltage feedback unit and a switch control unit which are connected with the voltage conversion controller;

The voltage regulating unit is respectively connected with the commercial vehicle low-voltage electric platform and the input end of the voltage conversion controller and is used for regulating and setting the output voltage output by the voltage conversion controller;

the voltage feedback unit is connected with the output end of the voltage conversion controller and is used for sampling and feeding back the output voltage output by the voltage conversion controller;

the switch control unit is respectively connected with the input end and the output end of the voltage conversion controller and is used for correspondingly carrying out switch control on the output voltage output by the voltage conversion controller according to the control of the voltage conversion controller so as to regulate the output voltage;

the voltage conversion controller is respectively connected with the voltage regulating unit, the voltage feedback unit and the switch control unit and is used for correspondingly controlling the working state of the switch control unit according to comparison between the output voltage of the voltage conversion controller regulated and set by the voltage regulating unit and the output voltage of the voltage conversion controller acquired and fed back by the voltage feedback unit so as to enable the output voltage regulated to be actually output to reach the output voltage of the voltage conversion controller set by the voltage regulating unit.

In some embodiments, the buck conversion module further includes a diagnostic unit, a first voltage stabilizing filter unit, a second voltage stabilizing filter unit, a third voltage stabilizing filter unit, and a compensation unit;

the diagnosis unit is respectively connected with the commercial vehicle low-voltage power platform, the voltage conversion controller and the switch control unit and is used for detecting and diagnosing the output voltage and current of the buck conversion module;

the first voltage stabilizing and filtering unit is connected with the low-voltage power supply platform of the commercial vehicle and the diagnosis unit and is used for stabilizing and filtering the output voltage of the low-voltage power supply platform of the commercial vehicle;

the second voltage stabilizing and filtering unit is connected with the low-voltage power platform of the commercial vehicle and the voltage conversion controller and is used for stabilizing and filtering the output voltage of the low-voltage power platform of the commercial vehicle and the input voltage of the voltage conversion controller;

the third voltage stabilizing and filtering unit is respectively connected with the voltage conversion controller, the switch control unit and each load and is used for stabilizing and filtering the output voltage of the voltage reduction conversion module;

the compensation unit is connected with the voltage conversion controller and is used for carrying out voltage compensation on the voltage conversion controller.

In some embodiments, the voltage sampling module comprises a first resistor connected with a commercial vehicle low-voltage power platform, and a second resistor and a first capacitor connected with the first resistor;

the first resistor one end is connected with the commercial vehicle low voltage electric platform, the first resistor other end respectively with second resistor one end first electric capacity one end and enable control module to be connected, the second resistor other end and the first electric capacity other end all ground connection.

In some embodiments, the voltage regulating unit includes a third resistor connected to a low voltage platform of the commercial vehicle, and a fourth resistor connected to the third resistor;

one end of the third resistor is connected with the low-voltage power platform of the commercial vehicle, the other end of the third resistor is respectively connected with one end of the fourth resistor and the comparison input end of the voltage conversion controller, and the other end of the fourth resistor is grounded.

In some embodiments, the voltage feedback unit includes a fifth resistor connected to the voltage conversion controller, and a sixth resistor connected to the fifth resistor;

one end of the fifth resistor is connected with the voltage output end of the voltage conversion controller, the other end of the fifth resistor is respectively connected with one end of the sixth resistor and the feedback input end of the voltage conversion controller, and the other end of the sixth resistor is grounded.

In some embodiments, the switch control unit includes a seventh resistor connected to the voltage conversion controller, a first field effect transistor connected to the seventh resistor, and a first diode and a first inductor connected to the first field effect transistor;

one end of the seventh resistor is connected with the grid driving output end of the voltage conversion controller, the other end of the seventh resistor is connected with the grid of the first field effect transistor, the source electrode of the first field effect transistor is connected with the current induction input end of the voltage conversion controller, the drain electrode of the first field effect transistor is respectively connected with the cathode of the first diode and one end of the first inductor, the anode of the first diode is grounded, and the other end of the first inductor is connected with the voltage output end of the voltage conversion controller and each load.

In some embodiments, the diagnostic unit includes an eighth resistor and a second capacitor, wherein the eighth resistor is connected to the low-voltage power platform of the commercial vehicle, one end of the eighth resistor is connected to one end of the low-voltage power platform of the commercial vehicle and one end of the second capacitor, the other end of the eighth resistor is connected to the current sensing input end of the voltage conversion controller and the switch control unit, and the other end of the second capacitor is connected to the driving input end of the voltage conversion controller;

The first voltage stabilizing and filtering unit comprises a third capacitor and a fourth capacitor which are connected with a low-voltage power platform of the commercial vehicle, one end of the third capacitor and one end of the fourth capacitor are respectively connected with the low-voltage power platform of the commercial vehicle and the diagnostic unit, and the other end of the third capacitor and the other end of the fourth capacitor are grounded;

the second voltage stabilizing and filtering unit comprises a fifth capacitor and a sixth capacitor which are connected with a low-voltage power platform of the commercial vehicle, one end of the fifth capacitor and one end of the sixth capacitor are respectively connected with the low-voltage power platform of the commercial vehicle and the power input end of the voltage conversion controller, and the other end of the fifth capacitor and the other end of the sixth capacitor are grounded;

the third voltage stabilizing filter unit comprises a seventh capacitor and an eighth capacitor which are connected with the voltage conversion controller, the switch control unit and the loads, one end of the seventh capacitor and one end of the eighth capacitor are respectively connected with the voltage output end of the voltage conversion controller, the switch control unit and the loads, and the other end of the seventh capacitor and the other end of the eighth capacitor are grounded;

the compensation unit comprises a ninth capacitor connected with the voltage conversion controller and a ninth resistor connected with the ninth capacitor, one end of the ninth capacitor is connected with the compensation input end of the voltage conversion controller, the other end of the ninth capacitor is connected with one end of the ninth resistor, and the other end of the ninth resistor is grounded.

In some embodiments, the circuit further comprises an anti-reflection diode connected to the commercial vehicle low voltage platform, the voltage sampling module and the buck conversion module, respectively;

the positive pole of the anti-reflection diode is connected with a commercial vehicle low-voltage platform, and the negative pole of the anti-reflection diode is connected with the voltage sampling module and the buck conversion module.

The commercial vehicle heat management control device of the embodiment of the utility model comprises the commercial vehicle heat management control circuit.

The commercial vehicle of the embodiment of the utility model comprises the commercial vehicle heat management control device.

In the commercial vehicle thermal management control circuit in the embodiment of the utility model, the voltage sampling module is arranged to sample the output voltage of the commercial vehicle low-voltage platform so as to determine whether the output voltage is in a safe output voltage range; the voltage sampling module is used for sampling the voltage, and the buck conversion module is controlled to work when the sampled voltage is determined to be in a safety range, so that the buck conversion module can buck and convert the output voltage of a low-voltage power platform of the commercial vehicle into low-voltage power supply for each load to work, and the buck conversion module is controlled to stop working when the sampled voltage is determined not to be in the safety range, so that the buck conversion module does not work to avoid the problem of damage caused by overvoltage or undervoltage of each connected load; the voltage regulating unit is arranged in the buck conversion module, so that the output voltage can be regulated to meet the low-voltage power supply required by each load during operation; the voltage feedback unit is arranged in the buck conversion module, so that the output voltage can be sampled, the switch control unit is arranged in the buck conversion module, the output voltage can be adjusted, at the moment, the voltage conversion controller is arranged to control the working state of the switch control unit according to the comparison between the preset output voltage set by the voltage regulation unit and the actual output voltage acquired by the voltage feedback unit, so that the actual output voltage reaches the preset output voltage, and the low-voltage power supply meeting the working conditions of each load can be realized, therefore, the commercial vehicle can also be compatible with the output of 12V low-voltage power supply under the condition of using 24V low-voltage power supply output by the conventional commercial vehicle low-voltage power platform, the related electric device adopting 12V low-voltage power supply can be expanded and used on the commercial vehicle, the part products of the 12V low-voltage power supply have multiple product types, high maturity and stable quality in research and development and mass production, and the development cost of the whole parts of the commercial vehicle thermal management control system is reduced.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

FIG. 1 is a block schematic diagram of a commercial vehicle thermal management control circuit of an embodiment of the present utility model;

fig. 2 is a circuit diagram of a voltage sampling module and a buck conversion module in a thermal management control circuit for a commercial vehicle according to an embodiment of the present utility model.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements throughout or elements which may have the same or similar functions. The embodiments described below by referring to the drawings are exemplary only for explaining the present utility model and are not to be construed as limiting the present utility model.

In the description of embodiments of the present utility model, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present utility model, the meaning of "plurality" is two or more, unless explicitly defined otherwise.

In describing embodiments of the present utility model, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be either fixedly coupled, detachably coupled, or integrally coupled, for example, unless otherwise indicated and clearly defined; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present utility model can be understood by those of ordinary skill in the art according to specific circumstances.

The following disclosure provides many different embodiments, or examples, for implementing different structures of embodiments of the utility model. In order to simplify the disclosure of embodiments of the present utility model, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the utility model. Furthermore, embodiments of the present utility model may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and do not in itself indicate a relationship between the various embodiments and/or arrangements discussed. In addition, embodiments of the present utility model provide examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.

Referring to fig. 1, a schematic block diagram of a thermal management control circuit for a commercial vehicle according to an embodiment of the present utility model is shown for convenience of illustration, where the thermal management control circuit for a commercial vehicle according to an embodiment of the present utility model includes a voltage sampling module 10, an enable control module 20, and a buck conversion module 30, which are respectively connected to a low voltage platform of the commercial vehicle, and a plurality of loads connected to the buck conversion module 30;

the enabling control module 20 is also connected with the voltage sampling module 10 and the buck conversion module 30 respectively, and is used for controlling the working state of the buck conversion module 30 according to the output voltage of the commercial vehicle low-voltage platform sampled by the voltage sampling module 10;

the buck conversion module 30 comprises a voltage regulating unit 31 and a voltage conversion controller 32 which are connected with a low-voltage platform of the commercial vehicle, and a voltage feedback unit 33 and a switch control unit 34 which are connected with the voltage conversion controller 32;

the voltage regulating unit 31 is respectively connected with the input ends of the commercial vehicle low-voltage platform and the voltage conversion controller 32 and is used for regulating and setting the output voltage output by the voltage conversion controller 32;

The voltage feedback unit 33 is connected to the output end of the voltage conversion controller 32, and is used for sampling and feeding back the output voltage output by the voltage conversion controller 32;

the switch control unit 34 is connected to the input end and the output end of the voltage conversion controller 32, and is used for performing switch control on the output voltage output by the voltage conversion controller 32 according to the control of the voltage conversion controller 32, so as to regulate the output voltage;

the voltage conversion controller 32 is respectively connected to the voltage adjustment unit 31, the voltage feedback unit 33, and the switch control unit 34, and is configured to control the operation state of the switch control unit 34 according to the comparison between the output voltage of the voltage conversion controller 32 set by the adjustment of the voltage adjustment unit 31 and the output voltage of the voltage conversion controller 32 collected and fed back by the voltage feedback unit 33, so that the output voltage adjusted to be actually output reaches the output voltage of the voltage conversion controller 32 set by the voltage adjustment unit 31.

In one embodiment of the utility model, the commercial vehicle thermal management control circuit is applied to a new energy commercial vehicle, wherein the new energy commercial vehicle mainly provides 24V low-voltage power supply, so that external part loads such as a large-caliber electronic expansion valve, a multi-way electronic water valve, an electric compressor and the like realize low-voltage power supply work, therefore, a commercial vehicle low-voltage power supply platform specifically provides 24V low-voltage power supply at the moment, however, related executor products applied to the existing 24V low-voltage power supply on the new energy commercial vehicle are few in size, high in cost and unstable in quality, and the product selection is more, the maturity is high and the quality is stable in research and development and mass production of corresponding 12V low-voltage power supply part products of the new energy commercial vehicle. Therefore, the utility model can convert the 24V low-voltage power supply provided by the commercial vehicle low-voltage power platform into the 12V low-voltage power supply by providing the commercial vehicle thermal management control circuit, so that the commercial vehicle can use the 24V low-voltage power supply and can also use the 12V low-voltage power supply in a compatible manner, and the air conditioner and thermal management control of the commercial vehicle is realized.

In one embodiment of the present utility model, the voltage sampling module 10 is connected to the low voltage power platform of the commercial vehicle and the enable control module 20, and is configured to sample the voltage of the low voltage power platform of the commercial vehicle and output the sampled voltage value to the enable control module 20. In specific implementation, the voltage sampling module 10 can input the sampled voltage of the low-voltage power platform of the commercial vehicle into an ADC (analog-to-digital converter) to realize sampling, and the ADC converts the voltage analog signal input by the voltage sampling module 10 into a digital signal, so that the digital magnitude of the voltage is finally output.

In one embodiment of the present utility model, the enabling control module 20 is respectively connected to the low-voltage power platform of the commercial vehicle, the voltage sampling module 10 and the buck conversion module 30, and is configured to correspondingly control the working state of the buck conversion module 30 according to the output voltage of the low-voltage power platform of the commercial vehicle sampled by the voltage sampling module 10. In particular, when the enabling control module 20 obtains that the output voltage of the commercial vehicle low voltage platform sampled by the voltage sampling module 10 is greater than the first threshold or less than the second threshold, in order to avoid damage to each load connected subsequently caused by overvoltage or undervoltage, the enabling control module 20 correspondingly outputs a first control signal to the buck conversion module 30 to stop the buck conversion module 30, so that the buck conversion module 30 stops outputting the voltage to each load connected subsequently to stop the operation of each load; when the enabling control module 20 obtains that the output voltage of the low-voltage power platform of the commercial vehicle sampled by the voltage sampling module 10 is smaller than the first threshold and larger than the second threshold, the output voltage of the low-voltage power platform of the commercial vehicle is in a normal fluctuation state, so that the enabling control module 20 correspondingly outputs a second control signal to the buck conversion module 30 to enable the buck conversion module 30 to work, and the buck conversion module 30 outputs the voltage to each load connected subsequently to enable each load to work normally. In specific implementation, the enabling control module 20 may be a module device with ADC sampling, processing and signal output functions, and may be a controller with control and signal processing functions, such as a single chip microcomputer, a DSP (Digital Signal Processing ), etc., which is set according to actual use requirements of users, and is not limited herein.

In one embodiment of the present utility model, the buck conversion module 30 is respectively connected to the low voltage platform of the commercial vehicle, the enable control module 20 and each load, and is configured to correspondingly determine whether to buck the output voltage of the low voltage platform of the commercial vehicle and output the stepped-down voltage to each load according to the control of the enable control module 20. Specifically, the buck conversion module 30 mainly performs buck conversion on the 24V low-voltage power supply output by the low-voltage platform of the commercial vehicle to 12V low-voltage power supply, so that various loads for 12V power supply can be provided, and 12V power supply work of each load can be realized. In this embodiment, the buck conversion module 30 includes a voltage regulator 31, a voltage conversion controller 32, a voltage feedback unit 33, and a switch control unit 34.

The voltage adjusting unit 31 is respectively connected to the low-voltage power platform of the commercial vehicle and the input end of the voltage conversion controller 32, and is used for adjusting the output voltage outputted by the voltage conversion controller 32, that is, the voltage adjusting unit 31 is used for adjusting the output voltage of the voltage down-conversion module 30, in this embodiment, the voltage adjusting unit 31 is used for down-converting the 24V low-voltage power supply outputted by the low-voltage power platform of the commercial vehicle into the 12V low-voltage power supply, it can be understood that in other embodiments of the present utility model, the voltage adjusting unit 31 can also down-convert the 24V low-voltage power supply outputted by the low-voltage power platform of the commercial vehicle into various voltage values for supplying power for the load operation, which is set according to the actual use requirement, and is not specifically limited herein.

The voltage feedback unit 33 is connected to an output end of the voltage conversion controller 32, and is configured to sample and feed back the output voltage output by the voltage conversion controller 32, so as to determine whether the output voltage output by the voltage conversion controller 32 is the output voltage adjusted and set by the voltage adjustment unit 31, so that the voltage conversion controller 32 can adjust the output voltage according to the feedback corresponding to the voltage value fed back by the voltage feedback unit 33, and realize stable voltage output.

The switch control unit 34 is respectively connected to an input end and an output end of the voltage conversion controller 32, and is configured to perform switch control on the output voltage output by the voltage conversion controller 32 according to control of the voltage conversion controller 32, so as to adjust the output voltage, specifically, the switch control unit 34 may be an on-off device with a specific on-off function, and at this time, according to control of the voltage conversion controller 32, a switch on-off state on a path from the low-voltage platform of the commercial vehicle to the load is achieved, so that the magnitude of the output voltage output by the voltage conversion controller 32 can be controlled, and a function of adjusting the output voltage is achieved. In practice, the higher the switching frequency or duty cycle of the switching control unit 34, the higher the corresponding output voltage; and the lower the switching frequency or duty cycle of the switching control unit 34, the lower the corresponding output voltage. The voltage conversion controller 32 is respectively connected to the voltage adjustment unit 31, the voltage feedback unit 33, and the switch control unit 34, and is configured to control the operation state of the switch control unit 34 according to the comparison between the output voltage of the voltage conversion controller 32 set by the adjustment of the voltage adjustment unit 31 and the output voltage of the voltage conversion controller 32 collected and fed back by the voltage feedback unit 33, so that the output voltage adjusted to be actually output reaches the output voltage of the voltage conversion controller 32 set by the voltage adjustment unit 31. That is, the voltage adjusting unit 31 is configured to set a preset output voltage value, and the voltage feedback unit 33 is configured to collect an actual output voltage value, and when the voltage conversion controller 32 determines that the actual output voltage value is higher than the preset output voltage value, the switching frequency or the duty cycle of the switch control unit 34 is controlled to be lowered so that the actual output voltage is gradually reduced until the actual output voltage value is equal to the preset output voltage value; when the voltage conversion controller 32 determines that the actual output voltage value is lower than the preset output voltage value, the actual output voltage is gradually increased until it is equal to the preset output voltage value by controlling the switching frequency or the duty ratio of the switching control unit 34 to be turned up. In particular, the voltage conversion controller 32 may be a buck DC-DC switch controller.

In one embodiment of the present utility model, the load is a component part powered by 12V low voltage, and optionally, the load may be a component part such as a large-caliber electronic expansion valve, a multi-way electronic water valve, an electric compressor, etc., which is specifically set according to actual use requirements, and is not specifically limited herein.

In summary, in the thermal management control circuit for a commercial vehicle according to the embodiment of the present utility model, the voltage sampling module 10 is configured to sample the output voltage of the commercial vehicle low voltage platform to determine whether the output voltage is in the safe output voltage range; the voltage sampled by the voltage sampling module 10 is obtained through the setting enabling control module 20, and the buck conversion module 30 is controlled to work when the sampled voltage is determined to be in a safety range, so that the buck conversion module 30 can buck-convert the output voltage of a low-voltage power platform of a commercial vehicle into low-voltage power supply for each load to work, and the buck conversion module 30 is controlled to stop working when the sampled voltage is determined not to be in the safety range, so that the buck conversion module 30 does not work to avoid the problem of damage caused by overvoltage or undervoltage of each connected load; the voltage regulating unit 31 is arranged in the buck conversion module 30, so that the output voltage can be regulated to meet the low-voltage power supply required by each load during operation; the voltage feedback unit 33 is arranged in the buck conversion module 30, so that the output voltage can be sampled, the switch control unit 34 is arranged in the buck conversion module 30, the output voltage can be adjusted, at the moment, the voltage conversion controller 32 is arranged to correspondingly control the working state of the switch control unit 34 according to the comparison of the preset output voltage set by the voltage adjustment unit 31 and the actual output voltage acquired by the voltage feedback unit 33, so that the actual output voltage reaches the preset output voltage, low-voltage power supply meeting the working conditions of various loads can be realized, the commercial vehicle can also be compatible with the output of 12V low-voltage power supply under the condition of using the 24V low-voltage power supply output by the conventional commercial vehicle low-voltage electric platform, the related electric device adopting the 12V low-voltage power supply can be expanded and used on the commercial vehicle, the component products of the 12V low-voltage power supply can be selected more in research and development and mass production use, the maturity is high, and the quality is stable, and the development cost of the whole components of the thermal management control system of the commercial vehicle is reduced.

Further, as shown in fig. 2, in one embodiment of the present utility model, the buck conversion module 30 further includes a diagnosis unit 35, a first voltage stabilizing and filtering unit 36, a second voltage stabilizing and filtering unit 37, a third voltage stabilizing and filtering unit 38, and a compensation unit 39;

the diagnosis unit 35 is respectively connected with the commercial vehicle low-voltage power platform, the voltage conversion controller 32 and the switch control unit 34, and is used for detecting and diagnosing the output voltage and current of the buck conversion module 30;

the first voltage stabilizing and filtering unit 36 is connected with the low-voltage power supply platform of the commercial vehicle and the diagnosis unit 35 and is used for stabilizing and filtering the output voltage of the low-voltage power supply platform of the commercial vehicle;

the second voltage stabilizing and filtering unit 37 is connected with the low-voltage power platform of the commercial vehicle and the voltage conversion controller 32, and is used for stabilizing and filtering the output voltage of the low-voltage power platform of the commercial vehicle and the input voltage of the voltage conversion controller 32;

the third voltage stabilizing and filtering unit 38 is respectively connected to the voltage conversion controller 32, the switch control unit 34 and each load, and is used for stabilizing and filtering the output voltage of the buck conversion module 30;

the compensation unit 39 is connected to the voltage conversion controller 32, and is used for performing voltage compensation on the voltage conversion controller 32.

Further, as shown in fig. 2, in one embodiment of the present utility model, the voltage sampling module 10 includes a first resistor R1 connected to the voltage platform of the commercial vehicle, and a second resistor R2 and a first capacitor C1 connected to the first resistor R1;

one end of the first resistor R1 is connected with an output end VIN of a low-voltage platform of the commercial vehicle, the other end of the first resistor R1 is respectively connected with one end of the second resistor R2, one end of the first capacitor C1 and an input end VIN-ADC of the enabling control module 20, and the other end of the second resistor R2 and the other end of the first capacitor C1 are grounded. Specifically, the first resistor R1 and the second resistor R2 are used for dividing the output voltage of the low-voltage platform of the commercial vehicle, and the first capacitor C1 is used for filtering the analog voltage input to the enable control module 20.

Further, as shown in fig. 2, in one embodiment of the present utility model, the voltage adjusting unit 31 includes a third resistor R3 connected to the commercial vehicle voltage platform, and a fourth resistor R4 connected to the third resistor R3;

one end of the third resistor R3 is connected with the output end VIN of the commercial vehicle low-voltage power platform, the other end of the third resistor R3 is respectively connected with one end of the fourth resistor R4 and the comparison input end of the voltage conversion controller 32, and the other end of the fourth resistor R4 is grounded. Specifically, the third resistor R3 and the fourth resistor R4 are used for dividing the output voltage of the commercial vehicle low-voltage platform, and the output voltage of the voltage conversion controller 32 is adjusted according to the divided value.

Further, as shown in fig. 2, in one embodiment of the present utility model, the voltage feedback unit 33 includes a fifth resistor R5 connected to the voltage conversion controller 32, and a sixth resistor R6 connected to the fifth resistor R5;

one end of the fifth resistor R5 is connected to the voltage output end of the voltage conversion controller 32, the other end of the fifth resistor R5 is connected to one end of the sixth resistor R6 and the feedback input end of the voltage conversion controller 32, and the other end of the sixth resistor R6 is grounded. Specifically, the fifth resistor R5 and the sixth resistor R6 are used for dividing the output voltage of the voltage conversion controller 32, and the divided value is input to the voltage conversion controller 32 as a feedback voltage, so that the voltage conversion controller 32 realizes feedback adjustment of the output voltage.

Further, as shown in fig. 2, in one embodiment of the present utility model, the switch control unit 34 includes a seventh resistor R7 connected to the voltage conversion controller 32, a first field effect transistor Q1 connected to the seventh resistor R7, and a first diode D1 and a first inductor L1 connected to the first field effect transistor Q1;

one end of a seventh resistor R7 is connected with the gate driving output end of the voltage conversion controller 32, the other end of the seventh resistor R7 is connected with the gate of the first field effect transistor Q1, the source electrode of the first field effect transistor Q1 is connected with the current sensing input end of the voltage conversion controller 32, the drain electrode of the first field effect transistor Q1 is respectively connected with the cathode of the first diode D1 and one end of the first inductor L1, the anode of the first diode D1 is grounded, and the other end of the first inductor L1 is connected with the voltage output end of the voltage conversion controller 32 and each load. Specifically, the first field effect transistor Q1 is a PMOS transistor, and is configured to be turned on and off correspondingly according to a switching signal output by the gate driving output end of the voltage conversion controller 32; the first diode D1 is a protection diode, and is configured to prevent loss and damage caused by a reverse current flowing through the first field effect transistor Q1 due to a reverse voltage generated by a magnetic field collapse in the first inductor L1 when the first field effect transistor Q1 is turned off; the first inductor L1 is used for resisting current change when the first field effect transistor Q1 is frequently turned on and off, and since the inductor has high output impedance, it is possible to smooth the output voltage and suppress noise.

Further, as shown in fig. 2, in one embodiment of the present utility model, the diagnostic unit 35 includes an eighth resistor R8 and a second capacitor C2 connected to the low voltage platform of the commercial vehicle, one end of the eighth resistor R8 is connected to one end of the low voltage platform of the commercial vehicle and one end of the second capacitor C2, the other end of the eighth resistor R8 is connected to the current sensing input end of the voltage conversion controller 32 and the switch control unit 34, respectively, and the other end of the second capacitor C2 is connected to the driving input end of the voltage conversion controller 32; specifically, the eighth resistor R8 is configured to detect a drain-source current of the first fet Q1 switch, so as to determine whether overcurrent protection or short-circuit protection is required; the second capacitor C2 is used for filtering and stabilizing the voltage of the driving input terminal of the voltage conversion controller 32, avoiding the driving input terminal from being affected by high-frequency interference or noise, and generating a gate-source voltage clamping the first fet Q1 for driving the first fet Q1 and protecting it from overvoltage and overcurrent.

The first voltage stabilizing and filtering unit 36 comprises a third capacitor C3 and a fourth capacitor C4 which are connected with the low-voltage power platform of the commercial vehicle, one end of the third capacitor C3 and one end of the fourth capacitor C4 are respectively connected with the low-voltage power platform of the commercial vehicle and the diagnostic unit 35, and the other end of the third capacitor C3 and the other end of the fourth capacitor C4 are grounded; specifically, the third capacitor C3 is an electrolytic capacitor, and is used for filtering out high-frequency interference or ripple wave, so as to improve stability and purity of output; the fourth capacitor C4 is used to filter out low frequency or unwanted frequency components, and improve the signal-to-noise ratio or selectivity.

The second voltage stabilizing and filtering unit 37 comprises a fifth capacitor C5 and a sixth capacitor C5 which are connected with the low-voltage platform of the commercial vehicle, one end of the fifth capacitor C5 and one end of the sixth capacitor C5 are respectively connected with the low-voltage platform of the commercial vehicle and the power input end of the voltage conversion controller 32, and the other end of the fifth capacitor C5 and the other end of the sixth capacitor C5 are grounded; specifically, the fifth capacitor C5 is an electrolytic capacitor, and is configured to filter out high-frequency interference or ripple on an input line between the low-voltage power platform of the commercial vehicle and the power input end of the voltage conversion controller 32, improve stability and purity of input, and provide sufficient energy for an internal circuit of the voltage conversion controller 32 and the external first field effect transistor Q1 when the input voltage changes or the instantaneous load increases, so as to prevent the output voltage from dropping or shaking. The sixth capacitor C5 is used for decoupling and compensating parasitic parameters (such as parasitic inductance, parasitic resistance, etc.) of the fifth capacitor C5, thereby improving the electrolytic effect and the frequency response.

The third voltage stabilizing filter unit 38 includes a seventh capacitor C7 and an eighth capacitor C8 connected to the voltage conversion controller 32, the switch control unit 34 and each load, one end of the seventh capacitor C7 and one end of the eighth capacitor C8 are respectively connected to the voltage output end of the voltage conversion controller 32, the switch control unit 34 and each load, and the other end of the seventh capacitor C7 and the other end of the eighth capacitor C8 are grounded; specifically, the seventh capacitor C7 is an electrolytic capacitor, and functions as a fifth capacitor C5 similarly, and is used for filtering and storing energy; while the eighth capacitor C8 functions similarly to the sixth capacitor C5 for decoupling and compensation.

The compensation unit 39 includes a ninth capacitor C9 connected to the voltage conversion controller 32 and a ninth resistor R9 connected to the ninth capacitor C9, one end of the ninth capacitor C9 is connected to the compensation input terminal of the voltage conversion controller 32, the other end of the ninth capacitor C9 is connected to one end of the ninth resistor R9, and the other end of the ninth resistor R9 is grounded. Specifically, the ninth capacitor C9 and the ninth resistor R9 form an RC compensation network to produce an effect opposite to the phase change or disturbance in the circuit to counteract their effects on circuit performance. The connection to ground through the series RC compensation network may in particular form a low-pass filter, i.e. allow only low-frequency signals to pass, while preventing high-frequency signals from passing. When high-frequency interference or noise exists in the circuit, the RC compensation network filters out, so that the stability and the signal-to-noise ratio of the circuit are improved. Meanwhile, the RC compensation network can also generate a phase delay effect, namely, when an input signal changes, an output signal has a certain delay. When phase change or instability exists in the circuit, the RC compensation network can offset the phase change or instability, so that the phase margin and the stability margin of the circuit are improved, and the stability and the response speed of the circuit can be improved.

Further, as shown in fig. 2, in one embodiment of the present utility model, the circuit further includes an anti-reflection diode D2 connected to the commercial vehicle low voltage platform, the voltage sampling module 10 and the buck conversion module 30, respectively;

the positive pole of the anti-reflection diode D2 is connected with a commercial vehicle low-voltage platform, and the negative pole of the anti-reflection diode D2 is connected with the voltage sampling module 10 and the buck conversion module 30. Specifically, the anti-reverse diode D2 is specifically a rectifier diode, and is configured to prevent reverse current from flowing backward into the commercial vehicle low-voltage power platform.

Specifically, as shown in fig. 2, the specific circuit of the voltage conversion controller 32 is specifically a TLE 6389-2GV chip, which has 14 working pins, where the first pin (ENABLE pin) of the voltage conversion controller 32 is an ENABLE terminal, and is connected to one end of the tenth resistor R10, and the other end of the tenth resistor R10 is connected to the output terminal vin_en of the ENABLE control module 20, so as to receive an external ENABLE signal, and turn on or off the operation of the voltage conversion controller 32 according to the ENABLE signal, and when the ENABLE control module 20 controls the ENABLE terminal to be at a high level (specifically greater than 5V), the corresponding control voltage conversion controller 32 performs operation to realize voltage output; when the enable control module 20 controls the enable terminal to be at a low level (specifically less than 5V), the corresponding control voltage conversion controller 32 stops operating so as not to perform voltage output. The second pin (FB pin) of the voltage conversion controller 32 is a feedback input end, and is connected to the fifth resistor R5 and the sixth resistor R6, and is configured to obtain the output voltage of the voltage conversion controller 32 fed back by the feedback unit, and compare the output voltage with the internal reference voltage of the chip, thereby implementing stable control of the output voltage. The third pin (VOUT pin) of the voltage conversion controller 32 is a voltage output terminal, which is connected to the first inductor L1, the fifth resistor R5, the seventh capacitor C7, the eighth capacitor C8, and each load, and is configured to provide an adjustable stable output voltage to each load. Wherein a fourth pin (GND pin) of the voltage conversion controller 32 is a ground terminal for connection to a common ground. The fifth pin (SYNC pin) of the voltage conversion controller 32 is a frequency synchronization input for receiving an external clock synchronization signal and synchronizing with the internal PWM/PFM regulator. The sixth pin (si_gnd pin) of the voltage conversion controller 32 is a signal ground terminal, and is used to provide a reference point of zero potential, so as to eliminate noise or interference in the signal, and realize stability and clarity of the signal. The seventh pin (SI pin) of the voltage conversion controller 32 is a comparison input terminal for receiving the divided voltage signal of the output voltage of the low voltage platform of the commercial vehicle, and comparing with the internal reference voltage to adjust the switching frequency of the voltage conversion controller 32. The eighth pin (COMP pin) of the voltage conversion controller 32 is a compensation input end, and is configured to receive the compensation voltage set by the external RC compensation network, and send the compensation voltage to the internal controller of the voltage conversion controller 32, so as to dynamically control the output voltage, and adjust the response speed and stability of the output voltage. The ninth pin (SO pin) of the voltage conversion controller 32 is a sensing output terminal for detecting whether the output voltage is lower than a set threshold value, and generating a reset signal. The tenth pin (RO pin) of the voltage conversion controller 32 is a reset output terminal, and is used for generating a reset signal and outputting the reset signal to a subsequent stage circuit. The eleventh pin (BDS pin) of the voltage conversion controller 32 is a driving input terminal, and is used for connecting a ceramic capacitor to generate a limited gate-source voltage to drive the first fet Q1, so as to improve the conversion efficiency, reduce the switching loss, and protect the first fet Q1 from overvoltage and overcurrent. The twelfth pin (GDRV pin) of the voltage conversion controller 32 is a gate driving output terminal, and is used for driving the on-off state of the external first fet Q1 according to the signal of the internal controller, so as to realize the on-off control of the output voltage. Wherein the thirteenth pin (VS pin) of the voltage conversion controller 32 is a power input terminal for connecting to an input power source. The fourteenth pin (CS pin) of the voltage conversion controller 32 is a current sensing input terminal for detecting the drain-source current in the external first fet Q1 to implement over-current protection or short-circuit protection.

When in use, the commercial vehicle low-voltage power platform outputs a dynamic range voltage based on 24V, the output voltage is protected by the anti-reverse diode D2 to prevent impact caused by reverse current, then the output voltage is divided by the first resistor R1 and the second resistor R2 in the voltage sampling module 10 and then is input to the enabling control module 20, at this moment, the enabling control module 20 judges whether the output voltage exceeds the threshold voltage according to the sampled voltage, if yes, the enabling control module 20 outputs a low level to the buck conversion module 30, at this moment, the buck conversion module 30 stops working, so as to avoid the problem of load damage caused by overvoltage or undervoltage, if no, the control module outputs a high level to the buck conversion module 30, at this moment, the buck conversion module 30 starts working, at first, the output voltage of the commercial vehicle low-voltage power platform is divided by the third resistor R3 and the fourth resistor R4 in the voltage regulating unit 31 and then is input to the comparison input end of the voltage conversion controller 32, the voltage conversion controller 32 determines the output voltage required to be output according to the voltage division value, then adjusts the duty ratio of the grid driving output end so as to control the on-off frequency of the first field effect transistor Q1 in the switch control unit 34, thereby adjusting the output voltage, then the output voltage is divided by the fifth resistor R5 and the sixth resistor R6 in the voltage feedback unit 33 and then is input to the feedback input end of the voltage conversion controller 32, the voltage conversion controller 32 adjusts the preset output voltage set by the voltage adjustment unit 31 and the duty ratio of the grid driving output end corresponding to the actual output voltage fed back by the voltage feedback unit 33, when the actual output voltage is lower than the preset output voltage, the duty ratio of the grid driving output end is increased, the on time of the first field effect transistor Q1 is prolonged, the output current increases; when the actual output voltage is higher than the preset output voltage, the duty ratio of the grid driving output end is reduced, the first field effect transistor Q1 is started for a period of time, and the output current is reduced. Therefore, stable control of the output voltage is realized, the output voltage can be adjusted until the output voltage actually output reaches the preset output voltage, and the working power supply of each load can be met. When the first fet Q1 in the switch control unit 34 is turned on, the eighth resistor R8 of the commercial vehicle low voltage power platform and the path from the switch control unit 34 to the load are sequentially diagnosed, and the drain-source current of the first fet Q1 can be input to the current sensing input end of the voltage conversion controller 32, and at this time, whether the over-current or the short-circuit is performed is determined according to the magnitude of the drain-source current, so as to implement the over-current protection or the short-circuit protection.

The embodiment of the utility model also provides a commercial vehicle thermal management control device which comprises the commercial vehicle thermal management control circuit.

The heat management control device for a commercial vehicle provided in this embodiment has the same implementation principle and technical effects as those of the foregoing circuit embodiment, and for brevity, reference may be made to the corresponding content in the foregoing circuit embodiment for the part of the description of the device embodiment that is not mentioned.

The embodiment of the utility model also provides a commercial vehicle, which comprises the commercial vehicle heat management control device.

The commercial vehicle provided in this embodiment has the same implementation principle and technical effects as those of the foregoing circuit and device embodiments, and for brevity, reference may be made to the corresponding contents of the foregoing circuit and device embodiments where the device embodiments are not mentioned.

In the description of the present specification, reference to the terms "one embodiment," "certain embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art within the scope of the utility model.

Claims

1. The utility model provides a commercial car thermal management control circuit which characterized in that, the circuit includes voltage sampling module, enable control module and step-down conversion module that are connected with commercial car low voltage electric platform respectively, and a plurality of loads that are connected with the step-down conversion module;

2. The commercial vehicle thermal management control circuit of claim 1, wherein the buck conversion module further comprises a diagnostic unit, a first voltage stabilizing filter unit, a second voltage stabilizing filter unit, a third voltage stabilizing filter unit, and a compensation unit;

3. The commercial vehicle thermal management control circuit of claim 1, wherein the voltage sampling module comprises a first resistor connected to a commercial vehicle voltage platform, and a second resistor and a first capacitor connected to the first resistor;

4. The commercial vehicle thermal management control circuit of claim 1, wherein the voltage regulating unit comprises a third resistor connected to a commercial vehicle voltage platform, and a fourth resistor connected to the third resistor;

5. The commercial vehicle thermal management control circuit of claim 1, wherein the voltage feedback unit comprises a fifth resistor connected to a voltage conversion controller, and a sixth resistor connected to the fifth resistor;

6. The commercial vehicle thermal management control circuit of claim 1, wherein the switch control unit comprises a seventh resistor connected to the voltage conversion controller, a first field effect transistor connected to the seventh resistor, and a first diode and a first inductor connected to the first field effect transistor;

7. The commercial vehicle thermal management control circuit according to claim 2, wherein the diagnosis unit comprises an eighth resistor and a second capacitor, which are connected with a commercial vehicle low-voltage electric platform, one end of the eighth resistor is connected with a commercial vehicle low-voltage electric platform and one end of the second capacitor, the other end of the eighth resistor is connected with a current sensing input end of the voltage conversion controller and the switch control unit, respectively, and the other end of the second capacitor is connected with a driving input end of the voltage conversion controller;

8. The commercial vehicle thermal management control circuit of claim 1, further comprising an anti-reflection diode connected to the commercial vehicle voltage platform, the voltage sampling module, and the buck conversion module, respectively;

9. A commercial vehicle thermal management control apparatus, characterized in that the apparatus comprises a commercial vehicle thermal management control circuit as claimed in any one of claims 1 to 8.

10. A commercial vehicle, characterized in that the commercial vehicle comprises a commercial vehicle thermal management control apparatus according to claim 9.