A vehicle heating system and control method

Abstract

The application provides a kind of automobile heating system and control method, including engine, first water pump, second water pump, fuel heater, three-way valve, front air conditioning assembly, first heater group and second heater group;First circulation loop includes the engine, second water pump, fuel heater, three-way valve, front air conditioning assembly and first water pump connected in sequence by pipeline;The first heater group and the second heater group are connected in series, and both are connected in parallel to the first circulation loop, the input end of the first heater group is connected with the third interface of the three-way valve by pipeline, and the output end of the second heater group is connected with the input end of the first water pump by pipeline;The first heater group is distributed near the middle door of the passenger area of the automobile, the second heater group is distributed in the passenger area of the automobile, and the front air conditioning assembly is arranged in the front end area of the passenger area.The application avoids the problems of low interior heating temperature, poor temperature uniformity and high energy consumption of the passenger car.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile heating control, in particular to an automobile heating system and a control method. BACKGROUND

[0002] At present, the interior volume of a passenger vehicle is generally more than 20 cubic meters, far exceeding the interior volume of a passenger car of about 3 cubic meters; in a low-temperature cold region, in order to ensure good heating performance of the passenger vehicle, the heating capacity needs to be at least 20 kW, and the engine heat alone cannot meet the heating demand, resulting in low interior heating temperature and poor comfort; due to the inability of the engine heat to meet the heating demand, the engine water temperature is low, the engine wear is aggravated, and the energy consumption is increased.

[0003] The existing technology passenger vehicle generally adopts a heating scheme of connecting 2-3 air heaters in series, since the water circuit of the air heater is a series connection scheme, the water temperature is reduced by about 5℃ after passing through each air heater, resulting in a difference in the air outlet temperature of the air heater in different water circuit flow sequences; due to the large difference in the distance between passengers at different positions and the air heater, when the passengers around the air heater in the first water circuit flow sequence feel a hot sensation on their legs, the passengers far away from other air heaters still feel that the heating temperature is low and the comfort is poor, and there is a problem of poor heating temperature uniformity.

[0004] In patent document CN106476568A, a heating system for a light passenger vehicle and a light passenger vehicle are disclosed, an engine end heat exchanger is added, an exhaust inlet, an exhaust outlet, a water inlet and a water outlet are arranged on the heat exchanger shell, the waste heat of the exhaust is utilized to improve the heating effect, and at the same time, the engine water temperature is increased, thereby improving the fuel utilization rate and reducing the engine wear. This patent will increase the exhaust back pressure of the engine, resulting in a decrease in the combustion efficiency of the engine, a decrease in the power performance and an increase in the energy consumption, and is not suitable for solving the problems of low heating temperature and poor temperature uniformity of the passenger vehicle.

[0005] In patent document CN215793075U, a heating system parallel water circuit circulation structure for a passenger vehicle is disclosed, which can control the water circuits of the defroster and the radiator at the same time, thereby realizing the control of heat. This patent is not suitable for solving the problems of low heating temperature and poor temperature uniformity of the passenger vehicle. SUMMARY

[0006] The purpose of the present application is to provide an automobile heating system which can be applied to a low-temperature cold region and avoids the problems of low interior heating temperature, poor temperature uniformity and high energy consumption of a passenger vehicle, and the specific scheme is as follows:

[0007] The automobile heating system of the present application comprises:

[0008] an engine, a first water pump, a second water pump, a fuel heater, a three-way valve, a front air conditioning assembly, a first air heater group and a second air heater group.

[0009] The first circulation loop comprises the engine, the second water pump, the fuel heater, the three-way valve, the front air conditioning assembly and the first water pump connected in sequence by pipes;

[0010] The first and second heater groups are connected in series and in parallel to the first circulation loop, the input end of the first heater group is connected to the third interface of the three-way valve through a pipe, the first interface of the three-way valve is connected to the output end of the fuel heater, the second interface of the three-way valve is connected to the input end of the front air conditioning assembly, and the output end of the second heater group is connected to the input end of the first water pump through a pipe;

[0011] The first heater group is distributed near the middle door of the passenger area of the vehicle, the second heater group is distributed in the passenger area of the vehicle, and the front air conditioning assembly is arranged in the front end area of the passenger area.

[0012] Further, a two-way valve is further included, which is connected in parallel to the first heater group, and is used to adjust the flow of the cooling liquid through the second heater group.

[0013] Further, the first heater group and the second heater group each include at least one heater, and each heater includes a temperature sensor arranged at an air inlet.

[0014] Further, each heater further includes a blower, a heater core and a plurality of air outlets, the blower is arranged at the air inlet, the heater core is internally provided with a pipe for circulating the cooling liquid, the cooling liquid in the pipe exchanges heat with the air inlet, the heated air inlet is discharged through the plurality of air outlets, and the plurality of air outlets are evenly arranged along the front end, left side and right side of the heater.

[0015] Further, a controller is further included, which is electrically connected to the second water pump, the fuel heater, the three-way valve, the two-way valve, the temperature sensor of the heater of the first heater group and the temperature sensor of the heater of the second heater group.

[0016] Further, a thermostat and a radiator are further included, which are connected in series and in parallel to the first circulation loop.

[0017] The input end of the thermostat is connected to the output end of the engine through a pipe, and the output end of the radiator is connected to the input end of the first water pump through a pipe.

[0018] The thermostat is used to detect the temperature of the cooling liquid in the pipe and determine whether to open according to the detected temperature, and when the thermostat is opened, the cooling liquid flowing through the thermostat is cooled by the radiator.

[0019] A control method of an automobile heating system, comprising:

[0020] Acquiring an ambient temperature outside the vehicle, and controlling whether to start the second water pump according to the ambient temperature outside the vehicle;

[0021] Determining whether to start the fuel heater according to the running time of the water pump and the ambient temperature;

[0022] Wherein: when the running time of the second water pump and the ambient temperature reach a preset condition, the fuel heater is started, and the heating power of the fuel heater is adjusted based on the water temperature of the engine;

[0023] Based on the temperature information of the engine, the opening size of the three-way valve is controlled to adjust the flow rate of the cooling liquid flowing through the front air conditioning assembly, the first heater group and the second heater group, and the flow rate of the cooling liquid is adjusted by the rotating speed of the second water pump to adjust the air outlet temperature of the front air conditioning assembly, the first heater group and the second heater group;

[0024] The temperature gear of the front air conditioning assembly, the first heater group and the second heater group is set according to the rotating speed of the second water pump.

[0025] Preferably, the adjustment of the heating power of the fuel heater based on the water temperature of the engine comprises:

[0026] When the water temperature of the engine is less than or equal to 70℃, the heating power of the fuel heater is 100%;

[0027] When the water temperature of the engine is greater than 70℃ and less than or equal to 80℃, the heating power of the fuel heater is 65-70%;

[0028] When the water temperature of the engine is greater than 80℃ and less than or equal to 85℃, the heating power of the fuel heater is 45-50%;

[0029] When the water temperature of the engine is greater than 85℃, and the duration of the water temperature of the engine reaches 10s, the fuel heater is stopped.

[0030] Preferably, a two-way valve is installed in parallel on the first heater group, and the opening size of the two-way valve is adjusted in real time according to the air inlet temperature difference between the first heater group and the second heater group;

[0031] The flow rate of the cooling liquid through the first heater group is adjusted based on the opening size of the two-way valve.

[0032] Preferably, the adjustment of the opening size of the two-way valve according to the air inlet temperature difference between the first heater group and the second heater group comprises:

[0033] When the air inlet temperature difference of the first and second heater groups is less than or equal to 2℃, the two-way valve opening degree is 0; when the air inlet temperature difference of the first and second heater groups is greater than 2℃ and less than or equal to 5℃, the two-way valve opening degree is 5-15%; when the air inlet temperature difference of the first and second heater groups is greater than or equal to 5℃, the two-way valve opening degree is 15-25%.

[0034] Compared with the prior art, the automobile heating system has the following beneficial effects:

[0035] The automobile heating system provided by the application realizes the purposes of passenger car heating temperature and air outlet uniformity in low-temperature cold regions, and reduces the energy consumption of the whole vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a schematic view of a three-dimensional structure of a heater;

[0037] Figure 2 is a top view of the heater;

[0038] Figure 3 is a distribution diagram of a front air conditioning assembly, a first heater group and a second heater in a passenger area;

[0039] Figure 4 is a top view of the front air conditioning assembly, the first heater group and the second heater in the passenger area;

[0040] Figure 5 is a schematic view of an automobile heating system;

[0041] In the figure:

[0042] 1, engine;

[0043] 2, first water pump;

[0044] 3, second water pump;

[0045] 4, fuel heater;

[0046] 5, three-way valve;

[0047] 51, first interface;

[0048] 52, second interface;

[0049] 53, third interface;

[0050] 6, front air conditioning assembly;

[0051] 7, first heater group;

[0052] 71. first heater;

[0053] 8. second heater group;

[0054] 82. second heater;

[0055] 83. third heater;

[0056] 84. fourth heater;

[0057] 9. two-way valve;

[0058] 10. temperature sensor;

[0059] 11. air outlet;

[0060] 12. thermostat;

[0061] 13. radiator. DETAILED DESCRIPTION

[0062] In order to make the purposes, technical solutions and advantages of the present application clearer, the following will be combined with the accompanying drawings to further describe the present application in detail. Figures 1-5 It is obvious that the embodiments described are only part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0063] It should be understood that, although the terms first, second, third, etc. can be used in the embodiments of the present application to describe, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, without departing from the scope of the embodiments of the present application, the first can also be called the second, and similarly, the second can also be called the first.

[0064] A vehicle heating system comprises:

[0065] The vehicle heating system comprises an engine 1, a first water pump 2, a second water pump 3, a fuel heater 4, a three-way valve 5, a front air conditioning assembly 6, a first heater group 7 and a second heater group 8.

[0066] The engine 1 and the first water pump 2 are connected by a belt drive;

[0067] It should be noted that the first water pump 2 of the application is a mechanical water pump, and the second water pump 3 is an electric water pump, and the mechanical water pump and the electric water pump provide power for water flow, wherein the mechanical water pump is connected with the engine 1 through a belt at a fixed speed ratio, and the rotating speed of the mechanical water pump follows the engine 1 at a fixed speed ratio; the electric water pump is started according to the environmental temperature, for example, when any of the front and rear air conditioning assemblies has a heating demand and the environmental temperature is less than 25 DEG C, the electric water pump is started; when neither of the front and rear air conditioning assemblies has a heating demand or the environmental temperature is greater than or equal to 25 DEG C, the electric water pump is stopped.

[0068] It should be further explained that the rear air conditioning assembly in the embodiment refers to the first heater group 7 and the second heater group 8.

[0069] The first circulating loop comprises the engine 1, the electric water pump, the fuel heater 4, the three-way valve 5, the front air conditioning assembly 6 and the mechanical water pump connected in sequence through pipelines;

[0070] The three-way valve 5 is used for adjusting the flow of the cooling liquid flowing through the front air conditioning assembly 6, for example, when the opening degree of the three-way valve 5 is 100%, the water flow distribution of the front air conditioning assembly 6 is 100%, and when the opening degree of the three-way valve 5 is 30%, the water flow distribution of the front air conditioning assembly 6 is 30%.

[0071] The first heater group 7 and the second heater group 8 are connected in series and connected in parallel to the first circulating loop, the input end of the first heater group 7 is connected with the third interface 53 of the three-way valve 5 through a pipeline, the first interface 51 of the three-way valve 5 is connected with the output end of the fuel heater 4, the second interface 52 of the three-way valve 5 is connected with the input end of the front air conditioning assembly 6, and the output end of the second heater group 8 is connected with the input end of the mechanical water pump through a pipeline;

[0072] The first heater group 7 is distributed near the middle door of the passenger area of the automobile, the second heater group 8 is distributed in the passenger area of the automobile, and the front air conditioning assembly 6 is arranged in the front end area of the passenger area.

[0073] The application realizes the purposes of uniformity of the heating temperature and the air outlet in the passenger car in the low-temperature cold region through the cooperative control of the first heater group 7, the second heater group 8, the fuel heater 4, the three-way valve 5 and the electric water pump, and the purpose of reducing the energy consumption of the whole vehicle is also achieved.

[0074] Further, the two-way valve 9 is further included, the two-way valve 9 is connected in parallel with the first heater group 7, and is used for adjusting the flow of the cooling liquid passing through the second heater group 8.

[0075] The first heater group 7 and the second heater group 8 each comprise at least one heater, each of which comprises a temperature sensor 10 arranged at an air inlet, a blower arranged at the air inlet, a heater core having a pipe for circulating cooling liquid inside, and a plurality of air outlets 11, wherein the heated air is discharged through the plurality of air outlets 11, and the plurality of air outlets 11 are evenly arranged along the front end, left side and right side of the heater.

[0076] The controller is electrically connected to the electric water pump, the fuel heater 4, the three-way valve 5, the two-way valve 9, the temperature sensor 10 of the heater of the first heater group 7 and the temperature sensor 10 of the heater of the second heater group 8, respectively, and is used to obtain the ambient temperature outside the vehicle and the water temperature of the engine 1, and adjust the temperature in the vehicle by controlling the rotating speed of the electric water pump, the opening degree of the three-way valve 5 and the two-way valve 9 according to the temperature in the vehicle detected by the temperature sensors 10 of the first heater group 7 and the second heater group 8.

[0077] In the embodiment, the first heater group 7 adopts one heater, and the second heater group 8 adopts three heaters connected in series, each of which is provided with seven air outlets 11, one of which is arranged at the lower part of the front end of the heater, two of which are symmetrically arranged at the upper part of the front end of the heater, and the other four of which are symmetrically arranged at the left and right parts of the heater, and the average value of the air inlet temperature of all the heaters is the temperature in the vehicle.

[0078] The design has the advantage that the hot air discharged by the heater can achieve radiation type air outlet, thereby meeting the heating air outlet performance of the passengers around the heater.

[0079] For the convenience of description, the heater adopted by the first heater group 7 is a first heater 71, the three heaters connected in series adopted by the second heater group 8 are a second heater 82, a third heater 83 and a fourth heater 84, respectively, and the first heater 71, the second heater 82, the third heater 83 and the fourth heater 84 are connected in series.

[0080] The arrangement principle of the heater is: 1. The air outlet of the heater should cover the passenger area in the rear row to the greatest extent; 2. Since the middle door needs to be opened to take passengers up and down, and the middle door is a moving part with poor air tightness, the heating air volume and temperature at the middle door position need to be improved to ensure the heating performance; based on the above arrangement principle, in combination with Figures 3-4As shown, since the water circuits of the warm air fans are connected in series, the water temperature drops by about 5 DEG C after passing through each warm air fan, resulting in differences in the outlet air temperature of the warm air fans in different water circuit passing sequences, in order to ensure the uniformity of the outlet air temperature of different warm air fans, the water circuit passing sequence of the warm air fan is designed.

[0081] In the embodiment, the first warm air fan 71, the third warm air fan 83, the fourth warm air fan 84 and the second warm air fan 82 are arranged in sequence from the position close to the middle door of the passenger area of the passenger car along the rear end direction of the passenger area, wherein the fourth warm air fan 84 is surrounded by the other three warm air fans, the hot air blown by the other three warm air fans can reach the position of the fourth warm air fan 84, although the water inlet temperature of the fourth warm air fan 84 is the lowest, the air inlet temperature of the fourth warm air fan 84 is the highest, and the above design effectively avoids the problem that the low water inlet temperature of the fourth warm air fan 84 leads to low outlet air temperature.

[0082] In order to improve the passenger heating performance at the position of the middle door, two warm air fans are arranged near the middle door and the water inlet temperature of the first warm air fan 71 is the highest, when the vehicle is driven for a long time without passengers getting on or off, there is a problem that the passengers at the position of the middle door, especially the passengers around the first warm air fan 71, have a hot feeling, and the passenger heating temperature at other positions is low, in order to solve the above problems, the water flow passing through the first warm air fan 71 is adjusted through the two-way valve in parallel with the first warm air fan 71, and then the outlet air temperature of the first warm air fan 71 is adjusted to ensure the uniformity of the passenger heating temperature in the rear passenger area, wherein the opening degree of the two-way valve is adjusted according to the temperature difference between the air inlet temperature T1 of the first warm air fan 71 and the air inlet temperature T2 of the second warm air fan 82, when (T1-T2)≤2 DEG C, the water valve opening degree is 0; 2<(T1-T2)≤5 DEG C, the opening degree of the two-way valve 9 is 10%; (T1-T2)>5 DEG C, the water valve opening degree is 20%.

[0083] Further, the passenger car heating system further comprises a thermostat 12 and a radiator 13 connected in series, which are connected in parallel to the first circulating circuit; the input end of the thermostat 12 is connected with the output end of the engine 1 through a pipeline, and the output end of the radiator 13 is connected with the input end of the mechanical water pump through a pipeline; the thermostat 12 is used for detecting the temperature of the cooling liquid in the pipeline and judging whether to open according to the detected cooling liquid temperature, and when the thermostat 12 is opened, the cooling liquid passing through the thermostat 12 is cooled by the radiator 13.

[0084] The advantage of the design is that the water temperature of the engine 1 is controlled by the thermostat 12 and the radiator 13 to avoid the case that the water temperature of the engine 1 is too high, for example, when the water temperature of the engine 1 is higher than 88 DEG C, the thermostat 12 is opened, and the cooling liquid enters the radiator 13 to be cooled, so that the water temperature of the engine 1 is controlled within a reasonable working temperature.

[0085] The radiator 13 in the application adopts a high-temperature radiator, and the application realizes the purposes of uniformity of the heating temperature and the air outlet in a passenger car in a low-temperature cold region and reduces the energy consumption of the whole vehicle through the cooperative control of the first and second air heater groups 7 and 8, the fuel heater 4, the three-way valve 5 and the electric water pump, and the structure and arrangement position of the air outlets 11 of the first and second air heater groups 7 and 8.

[0086] A control method of a passenger car heating system, comprising the following steps:

[0087] Step 1: Obtain the ambient temperature outside the vehicle, and control whether the electric water pump is started according to the ambient temperature outside the vehicle;

[0088] When the ambient temperature is less than 25℃, the electric water pump is started; when the ambient temperature is greater than or equal to 25℃, the electric water pump is stopped.

[0089] Step 2: Determine whether to start the fuel heater 4 according to the running time of the water pump and the ambient temperature;

[0090] Among them: when the running time of the electric water pump and the ambient temperature reach the preset condition, the fuel heater 4 is controlled to be started, and the heating power of the fuel heater 4 is adjusted based on the water temperature of the engine 1.

[0091] The preset value of the starting time of the electric water pump of the application is 20s, and the ambient temperature is preset to 15℃, when the starting time of the electric water pump lasts more than 20s and the ambient temperature is below 15℃, the fuel heater 4 is started, and after the fuel heater 4 is stopped, the water pump still needs to run for at least 20s to ensure that the fuel heater 4 can operate normally and prevent dry burning.

[0092] In step 2: when the water temperature of the engine 1 is less than or equal to 70℃, the heating power of the fuel heater 4 is 100%;

[0093] When the water temperature of the engine 1 is greater than 70℃ and less than or equal to 80℃, the heating power of the fuel heater 4 is 65-70%;

[0094] When the water temperature of the engine 1 is greater than 80℃ and less than or equal to 85℃, the heating power of the fuel heater 4 is 45-50%;

[0095] When the water temperature of the engine 1 is greater than 85℃, and the water temperature of the engine 1 lasts for 10s, the fuel heater 4 is stopped.

[0096] Step 3: Based on the temperature information of the engine 1, the opening size of the three-way valve 5 is controlled to adjust the flow of the cooling liquid through the front air conditioning assembly 6, the first heater group 7 and the second heater group 8, and the flow rate of the cooling liquid is adjusted by the rotation speed of the electric water pump to adjust the air outlet temperature of the front air conditioning assembly 6, the first heater group 7 and the second heater group 8.

[0097] Step 4: According to the rotation speed of the electric water pump, the temperature gear of the front air conditioning assembly 6, the first heater group 7 and the second heater group 8 is set correspondingly.

[0098] Step 5: The two-way valve 9 is installed in parallel on the first heater group 7, and the opening size of the two-way valve 9 is adjusted in real time according to the air inlet temperature difference between the first heater group 7 and the second heater group 8.

[0099] Based on the opening size of the two-way valve 9, the flow of the cooling liquid through the first heater group 7 is adjusted.

[0100] In step 5, when the air inlet temperature difference between the first heater group 7 and the second heater group 8 is less than or equal to 2℃, the opening of the two-way valve 9 is 0; when the air inlet temperature difference between the first heater group 7 and the second heater group 8 is greater than 2℃ and less than or equal to 5℃, the opening of the two-way valve 9 is 5-15%, and the preferred opening is 10%; when the air inlet temperature difference between the first heater group 7 and the second heater group 8 is greater than or equal to 5℃, the opening of the two-way valve 9 is 15-25%, and the preferred opening is 20%.

[0101] It should be noted that the front air conditioning assembly 6 is a front air conditioner, wherein the front air conditioner box temperature air door opening is used for cold air outlet, and the front air conditioner heating temperature is set to 3 gears, wherein the 3 gears are the hottest, and the temperature air door opening is 0; 1, 2 gears are cold and warm mixed air state, and the temperature air door opening is 20% and 10% respectively; the rear air conditioning assembly includes the first heater group 7 and the second heater group 8;

[0102] The ambient temperature is the temperature outside the vehicle; the indoor temperature is the average value of the air inlet temperature of the first heater group 7 and the second heater group 8; and the target temperature is the temperature required to be reached in the passenger area of the passenger car.

[0103] The temperature gears of the front air conditioning assembly 6, the first heater group 7 and the second heater group 8 in the embodiment are all set to three gears, which correspond to different rotation speeds of the electric water pump, as shown in Table 1:

[0104]

[0105] In the embodiment, the opening of the electric water pump is determined according to the outdoor ambient temperature, and the schematic description of the rear air conditioning assembly corresponding to the three temperature gears according to the outdoor ambient temperature is shown in Table 2:

[0106]

[0107] The following will be illustrated by examples:

[0108] Example 1

[0109] As shown in Figure 2 , Figure 4 , the ambient temperature is 18℃, only the front air conditioner is in the 3-gear heating condition, the ambient temperature is >15℃, the fuel heater 4 does not meet the opening condition, and the air conditioning heating system is executed according to the following settings: the front air conditioner temperature damper opening is 0, the three-way valve 5 opening is 100%, the electric water pump speed is 4200rpm, and the fuel heater 4 is not opened.

[0110] Example 2

[0111] As shown in Figure 2 , Figure 4 , the ambient temperature is 18℃, only the rear air conditioner is in the 3-gear heating condition, the ambient temperature is >15℃, the fuel heater 4 does not meet the opening condition, and the air conditioning heating system is executed according to the following settings: the three-way valve 5 opening is 0, and the target temperature in the vehicle is 25℃. The difference between the temperature in the vehicle (the average temperature of the air inlet of the four heaters) and the target temperature (25℃) is compared and analyzed, and the electric water pump speed is adjusted in real time according to Table 1. The two-way valve opening is adjusted in real time according to the temperature difference between the air inlet temperature T1 of the first heater 71 and the air inlet temperature T2 of the second heater 82. The adjustment logic is: (T1-T2)≤2℃, the two-way valve 9 opening is 0; 2<(T1-T2)≤5℃, the two-way valve 9 opening is 10%; (T1-T2)>5℃, the two-way valve 9 opening is 20%.

[0112] Example 3

[0113] As shown in Figure 2 , Figure 4 , the ambient temperature is 18℃, the front and rear air conditioners are in the 3-gear heating condition, the ambient temperature is >15℃, the fuel heater 4 does not meet the opening condition, and the air conditioning heating system is executed according to the following settings: the front air conditioner temperature damper opening is 0, the three-way water valve opening is 45%, the target temperature in the vehicle is 25℃, the difference between the temperature in the vehicle (the average temperature of the air inlet of the four heaters) and the target temperature (25℃) is compared and analyzed, and the electric water pump speed is adjusted in real time according to Table 1.

[0114] Example 4

[0115] As shown in Figure 2 , Figure 4 , the ambient temperature is 30℃, the front and rear air conditioners are in the 1-gear heating condition, the ambient temperature is >25℃, the electric water pump and the fuel heater 4 do not meet the opening condition, and the air conditioning heating system is executed according to the following settings: the front air conditioner temperature damper opening is 20%, the three-way valve 5 opening is 32%, the electric water pump and the fuel heater 4 are not opened.

[0116] Example 5

[0117] like Figure 2 , Figure 4 As shown, when the ambient temperature is -25℃, with only the front air conditioning set to heating mode 3, the front air conditioning heating system operates according to the following settings: the front air conditioning unit temperature damper opening is 0%, the three-way valve 5 opening is 100%, and the electric water pump speed is 4200 rpm. If the electric water pump runs for more than 20 seconds, the fuel heater 4 switches on and off and controls the heating power according to the engine 1 coolant temperature: when the engine 1 coolant temperature is ≤70℃, the heating power is 100%; when 70℃ < engine 1 coolant temperature ≤80℃, the heating power is 70%; when 80℃ < engine 1 coolant temperature ≤85℃, the heating power is 50%; when the engine 1 coolant temperature is >85℃ and remains so for 10 seconds, the fuel heater 4 stops. After stopping, it must restart when the engine 1 coolant temperature is ≤75℃.

[0118] Example 6

[0119] like Figure 2 , Figure 4 As shown, the ambient temperature is -25℃. With only the rear air conditioning on at level 3 for heating, the air conditioning heating system operates according to the following settings: three-way valve 5 opening is 0%, and the target interior temperature is 23℃. By comparing the interior temperature (average intake temperature of the four heaters) with the target temperature (23℃), the electric water pump speed is adjusted in real-time according to Table 1. If the electric water pump runs for more than 20 seconds, the fuel heater is activated, and the heating power is controlled based on the engine coolant temperature. When the engine coolant temperature is ≤70℃, the heating power is 100%; 70℃ < engine coolant temperature ≤80℃, the heating power is 70%; 80℃ < engine coolant temperature ≤85℃, the heating power is 50%; if the engine coolant temperature is >85℃ and remains so for 10 seconds, the fuel heater stops. Restarting after stopping requires the engine coolant temperature to be ≤75℃.

[0120] Example 7

[0121] like Figure 2 , Figure 4 Figure 2 Figure 4 As shown, the ambient temperature is -25℃, and both the front and rear air conditioners are in heating mode at level 3. The air conditioning heating system is operated according to the following settings: the opening of the front air conditioning unit temperature damper is 0, the opening of the three-way valve 5 is 45%, and the target temperature inside the vehicle is 23℃. The difference between the inside temperature (average air intake temperature of the four heaters) and the target temperature (23℃) is compared and analyzed, and the speed of the electric water pump is adjusted in real time according to Table 1.

[0122] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

Claims

1. A car heating system, characterized in that, Includes engine (1), first water pump (2), second water pump (3), fuel heater (4), three-way valve (5), front air conditioning assembly (6), first heating unit (7) and second heating unit (8); The first circulation loop includes the engine (1), the second water pump (3), the fuel heater (4), the three-way valve (5), the front air conditioning assembly (6), and the first water pump (2) connected in sequence by pipes. The first heater unit (7) and the second heater unit (8) are connected in series and connected in parallel to the first circulation loop. The input end of the first heater unit (7) is connected to the third port (53) of the three-way valve (5) through a pipe. The first port (51) of the three-way valve (5) is connected to the output end of the fuel heater (4). The second port (52) of the three-way valve (5) is connected to the input end of the front air conditioning assembly (6). The output end of the second heater unit (8) is connected to the input end of the first water pump (2) through a pipe. The first heating unit (7) is located near the middle door of the passenger area of ​​the car, the second heating unit (8) is located in the passenger area of ​​the car, and the front air conditioning assembly (6) is located in the front area of ​​the passenger area. It also includes a two-way valve (9), which is connected in parallel with the first heater unit (7), and the two-way valve (9) is used to regulate the flow rate of the coolant passing through the first heater unit (7); The first heating unit uses a first heating fan; the second heating unit uses three heating fans connected in series, namely the second heating fan, the third heating fan, and the fourth heating fan; the first heating fan, the second heating fan, the third heating fan, and the fourth heating fan are connected in series in sequence; The first, third, fourth, and second heaters are arranged sequentially from the middle door of the passenger area along the rear of the passenger area. The fourth heater is surrounded by the other three heaters, and the hot air blown by the other heaters can reach the fourth heater.

2. The automotive heating system according to claim 1, characterized in that, Each of the aforementioned heaters includes a temperature sensor (10) located at the air inlet.

3. The automotive heating system according to claim 2, characterized in that, Each of the aforementioned heaters also includes a blower, a heater core, and several air outlets (11). The blower is located at the air inlet. The heater core has a pipe for circulating coolant inside. The coolant in the pipe exchanges heat with the incoming air. The heated incoming air is discharged through several air outlets (11). The several air outlets (11) are evenly arranged along the outer front end, left side, and right side of the heater.

4. The automotive heating system according to claim 2, characterized in that, It also includes a controller, which is electrically connected to the temperature sensor (10) of the second water pump (3), the fuel heater (4), the three-way valve (5), the two-way valve (9), the temperature sensor (10) of the heater of the first heater unit (7), and the temperature sensor (10) of the heater of the second heater unit (8).

5. The automotive heating system according to claim 1, characterized in that, It also includes a thermostat (12) and a radiator (13) connected in series, which are connected in parallel to the first circulation loop; The input end of the thermostat (12) is connected to the output end of the engine (1) through a pipe, and the output end of the radiator (13) is connected to the input end of the first water pump (2) through a pipe. The thermostat (12) is used to detect the temperature of the coolant in the pipeline and to determine whether to open based on the detected temperature. When the thermostat (12) is opened, the coolant flowing through the thermostat (12) is dissipated through the radiator (13).

6. A control method for an automotive heating system according to any one of claims 1-5, characterized in that, include: Get the ambient temperature outside the vehicle and control whether the second water pump (3) is turned on based on the ambient temperature outside the vehicle; Determine whether to turn on the fuel heater based on the pump's running time and ambient temperature (4). Among them: when the running time of the second water pump (3) and the ambient temperature reach the preset conditions, the fuel heater (4) is turned on and the heating power of the fuel heater (4) is adjusted based on the water temperature of the engine (1). Based on the temperature information of the engine (1), the opening of the three-way valve (5) is controlled to adjust the flow rate of the coolant flowing through the front air conditioning assembly (6), the first heater unit (7), and the second heater unit (8), and the flow rate of the coolant is adjusted by the speed of the second water pump (3) to adjust the outlet air temperature of the front air conditioning assembly (6), the first heater unit (7), and the second heater unit (8); The temperature settings of the front air conditioning assembly (6), the first heating unit (7), and the second heating unit (8) are set according to the rotation speed of the second water pump (3).

7. The control method for an automotive heating system according to claim 6, characterized in that, The adjustment of the heating power of the fuel heater (4) based on the engine (1) water temperature includes: When the engine (1) coolant temperature is less than or equal to 70°C, the heating power of the fuel heater (4) is 100%. When the engine (1) water temperature is greater than 70°C and less than or equal to 80°C, the heating power of the fuel heater (4) is 65-70%; When the engine (1) coolant temperature is greater than 80°C and less than or equal to 85°C, the heating power of the fuel heater (4) is 45-50%; When the engine (1) water temperature is greater than 85°C and the engine (1) water temperature lasts for 10 seconds, the fuel heater (4) stops.

8. The control method for an automotive heating system according to claim 6, characterized in that, A two-way valve (9) is installed in parallel on the first heating unit (7), and the opening of the two-way valve (9) is adjusted in real time according to the temperature difference between the inlet air of the first heating unit (7) and the second heating unit (8). The flow rate of coolant through the first heater unit (7) is adjusted based on the opening degree of the two-way valve (9).

9. The control method for an automotive heating system according to claim 8, characterized in that, The real-time adjustment of the opening degree of the two-way valve (9) based on the temperature difference between the inlet air of the first heater unit (7) and the second heater unit (8) includes: When the temperature difference between the inlet air of the first heater unit (7) and the second heater unit (8) is less than or equal to 2°C, the opening degree of the two-way valve (9) is 0; when the temperature difference between the inlet air of the first heater unit (7) and the second heater unit (8) is greater than 2°C and less than or equal to 5°C, the opening degree of the two-way valve (9) is 5-15%; when the temperature difference between the inlet air of the first heater unit (7) and the second heater unit (8) is greater than or equal to 5°C, the opening degree of the two-way valve (9) is 15-25%.

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