A temperature control method and system based on electric vehicle air heater

Abstract

The present invention relates to the technical field of electric vehicles, and in particular to a temperature control method based on an electric vehicle air heater, comprising: setting an expected temperature range T1-T2 of the heater heating element temperature; receiving a requested power value P_req of the heater heating power; real-time monitoring of the heater actual power value P_act and adjusting the heater heating power so that the actual power value P_act <= requested power value P_req; real-time monitoring of the heater heating element actual temperature value T_act, and controlling the actual temperature of the heating element to be between T1 and T2 and to remain stable when the actual power value P_act <= requested power value P_req. The present invention provides a temperature control method based on an electric vehicle air heater, which combines temperature control and power control for adjustment, has low cost, can meet the power limit requirements of the car or air conditioning controller for the heater, and can achieve the stability of the heating element temperature and the air outlet temperature of the air heater, which greatly increases the heating comfort of passengers.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to a temperature control method and system based on an electric vehicle air heater. Background Art

[0002] At present, more and more wind heater products are used in electric vehicles. They are installed in the car air-conditioning box to provide heat for the air-conditioning and provide heating for the driver and passengers. The wind heaters on electric vehicles currently on the market simply respond to the requested power value to heat, and simply control the heating power without controlling the temperature. Although this method is simple, it has disadvantages. It will cause huge temperature fluctuations at the air outlet of the air conditioner, affecting the heating experience of the passengers. The general way to solve this disadvantage is to add an additional temperature sensor to the air-conditioning box to monitor the outlet temperature of the heater. The air-conditioning box undergoes a large number of calibration experiments to obtain the logical algorithm for how to stably control the temperature of the heater, resulting in a higher cost for the air-conditioning box control system. In view of the above-mentioned defects, the present invention has made improvements. Summary of the invention

[0003] In order to overcome the shortcomings of the background technology, the present invention provides a temperature control method based on an electric vehicle air heater, which combines temperature control and power control for adjustment, has low cost, can not only meet the power limit requirements of the car or air-conditioning controller for the heater, but also achieve the stability of the heating element temperature and the air outlet temperature of the air heater, thereby greatly increasing the heating comfort of the passengers.

[0004] The present invention provides a temperature control method based on an electric vehicle air heater, comprising: setting an expected temperature range T1-T2 of the temperature of a heater heating element; receiving a requested power value P_req of the heater heating power; real-time monitoring of an actual power value P_act of the heater and adjusting the heater heating power so that the actual power value P_act is less than or equal to the requested power value P_req; real-time monitoring of an actual temperature value T_act of the heater heating element, and when the actual power value P_act is less than or equal to the requested power value P_req, controlling the actual temperature of the heating element to be between T1 and T2 and to remain stable.

[0005] Preferably, the above-mentioned temperature control method based on the electric vehicle air heater comprises the following steps:

[0006] S1. Set the desired temperature range of the heater heating element temperature T1-T2;

[0007] S2. Receive the requested power value P_req of the heater heating power;

[0008] S3. Determine whether the actual power value P_act of the heater is greater than the requested power value P_req;

[0009] S4. If the actual power value P_act <= the requested power value P_req, determine whether the actual temperature value T_act of the heater heating element is not greater than the lower limit value T1 of the expected temperature range of the heating element;

[0010] S5. If the actual temperature value T_act of the heating element of the heater is greater than the lower limit value T1 of the expected temperature range of the heating element, determine whether the actual temperature value T_act of the heating element of the heater satisfies: T1<T_act<=T2;

[0011] S6. If the actual temperature value T_act of the heating element of the heater satisfies: T1<T_act<=T2, then determine whether the actual temperature value T_act of the heating element is stable;

[0012] S7. If the actual temperature value T_act of the heating element remains stable, the air outlet temperature becomes stable, and then the process loops back to step S2.

[0013] Preferably, in step S1, the desired temperature range T1-T2 for setting the temperature of the heating element of the heater is set by a heater controller.

[0014] Preferably, in step S1, the desired temperature range of the heater heating element temperature is set to 100°C-105°C.

[0015] Preferably, in step S2, the received request power value P_req of the heating power of the heater is the request power value P_req sent by the heater controller to the air conditioning controller.

[0016] Preferably, in step S3, if the actual power value P_act>the requested power value P_req, the heater power is reduced until the actual power value P_act=the requested power value P_req, and then the process returns to step S2.

[0017] Preferably, in step S4, if the actual temperature value of the heater heating element T_act<=T1, the heater power is increased to generate heat, and then the process returns to step S2.

[0018] Preferably, in step S5, if the actual temperature value of the heater heating element T_act>T2, the heater power is adjusted to decrease by 10% based on the current actual power P_act for every 1°C increase in the actual temperature of the heater heating element, and then the process returns to step S4.

[0019] Preferably, in step S6, if the actual temperature value T_act of the heating element is unstable, the process returns to step S3.

[0020] The present invention also provides a temperature control system based on an electric vehicle air heater, comprising an air conditioning controller and an electric vehicle heater, wherein the electric vehicle heater comprises a heater controller, a heater heating element and a heating element temperature sensor;

[0021] The air conditioning controller is used to send a request power value P_req of the heater heating power to the heater controller;

[0022] The heater controller is used to receive the requested power value P_req of the heater heating power and set the desired temperature range T1-T2 of the heater heating element temperature, and is also used to monitor the actual power value P_act of the heater and the actual temperature value T_act of the heater heating element in real time, and is also used to control and adjust the heater power heating;

[0023] The heating element of the heater receives the power control command of the heater controller to heat, and the heating power of the heating element of the heater is the actual power of the heater;

[0024] The heating element temperature sensor is used to measure the actual temperature value T_act of the heating element of the heater in real time and transmit it to the heater controller.

[0025] In summary, the beneficial effects of the present invention are:

[0026] The present invention is based on a temperature control method and system for an electric vehicle air heater, which combines temperature control with power control. It can dynamically adjust the power of the heater according to the heating element temperature and power value during the process of the heating element temperature rising or falling, so as to achieve dynamic stability of the heating element temperature. The overall cost is low, which not only meets the power limit requirements of the automobile or air conditioner for the heater, but also achieves the stability of the heating element temperature and the air outlet temperature of the air heater, thereby increasing the heating comfort of the passengers.

[0027] The present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 A schematic flow chart of the temperature control method of the present invention;

[0030] Figure 2 A communication diagram of the air-conditioning controller and the electric vehicle heater of the present invention;

[0031] Figure 3 A schematic diagram of collecting the temperature of the heating element of the heater of the present invention;

[0032] Markings in the figure: 1-electric vehicle heater, 2-communication signal line, 3-car or air-conditioning controller, 4-air-conditioning box, 5-heater controller, 6-heater heating element, 7-heating element temperature sensor. DETAILED DESCRIPTION

[0033] The following will be combined with the embodiments of the present invention Figures 1 to 3 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In order to make the purpose, technical solution and advantages of the implementation of the present invention clearer, the technical solution in the embodiment of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiment of the present invention.

[0035] like Figures 1 to 3 As shown, the present invention disclosed in this embodiment provides a temperature control method based on an electric vehicle wind heater, including: setting the expected temperature range T1-T2 of the temperature of the heater heating element 6; receiving the requested power value P_req of the heater heating power; real-time monitoring of the actual power value P_act of the heater and adjusting the heater heating power so that the actual power value P_act <= the requested power value P_req; real-time monitoring of the actual temperature value T_act of the heater heating element 6, and controlling the actual temperature of the heating element to be between T1 and T2 and remain stable when the actual power value P_act <= the requested power value P_req. The above-mentioned temperature control method based on the electric vehicle wind heater combines temperature control and power control, and can dynamically adjust the power of the heater according to the heating element temperature and power value during the process of the heating element temperature rising or falling, so as to achieve dynamic stability of the heating element temperature, which can not only meet the power limit requirements of the automobile or air conditioning controller 3 for the heater, but also realize the stability of the heating element temperature and the air outlet temperature of the wind heater, thereby increasing the heating comfort of the passengers.

[0036] Preferably, the above-mentioned temperature control method based on the electric vehicle air heater specifically includes the following steps:

[0037] S101. Set the desired temperature range T1-T2 of the heater heating element 6;

[0038] As a preferred technical solution, in step S101, the desired temperature range T1-T2 for setting the temperature of the heater heating element 6 is set by the heater controller 5. The temperature range T1-T2 can be conveniently set by the heater controller 5.

[0039] As a preferred technical solution, in step S101, the desired temperature range of the temperature of the heater heating element 6 is set to 100°C-105°C. In this embodiment, T1=100°C, T2=105°C, that is, the desired temperature range of the temperature of the heater heating element 6 is set to 100°C-105°C. The temperature range is selected appropriately, and by making the actual temperature of the heating element between 100°C-105°C and maintaining stability, the temperature of the air outlet can be stabilized, thereby increasing the heating comfort of the passengers.

[0040] S102. Receive a requested power value P_req of the heating power of the heater;

[0041] As a preferred technical solution, in step S102, the received request power value P_req of the heater heating power is the request power value P_req sent by the heater controller 5 to the air conditioning controller 3. In specific implementation, the heater controller 5 receives the request power value P_req sent by the car or air conditioning controller 3 in real time, adjusts the power and heats, which can well meet the power limit requirements of the car or air conditioning for the heater. In specific implementation, due to the characteristics of the heater, when the incoming air (cold air) takes away the heat of the heater heating element 6, the actual power value P_act of the heater will fluctuate.

[0042] S103. Determine whether the actual power value P_act of the heater is greater than the requested power value P_req;

[0043] In this step, the heater controller 5 monitors the actual heater power value P_act in real time and determines whether the actual heater power value P_act> the requested power value P_req is established. When the air heater is turned on, the heater power changes first and the temperature of the heater heating element 6 changes later, so the heater power is determined first.

[0044] S104. If the actual power value P_act>the requested power value P_req, reduce the heater power until the actual power value P_act=the requested power value P_req, and then return to step S102.

[0045] In this step, when P_act>P_req, the heater controller 5 adjusts and reduces the heater power until the actual power value P_act=the requested power value P_req, so that the actual power does not exceed the requested power value. At the same time, if the heater power is stable, the actual temperature T_act of the heating element will also be stable.

[0046] S105. If the actual power value P_act <= the requested power value P_req, determine whether the actual temperature value T_act of the heater heating element 6 is not greater than 100°C;

[0047] In this step, if the actual power value P_act<=requested power value P_req, that is, the power limit requirement of the car or air conditioner for the heater is met, a temperature judgment is performed, and different program steps are executed according to the result of the temperature judgment.

[0048] S106. If the actual temperature value T_act of the heater heating element 6 is less than or equal to 100°C, the heater power is increased to heat the heater, and then the process returns to step S102;

[0049] In this step, when T_act is less than or equal to 100°C, the heater controller 5 is used to increase the heater power and generate heat. As the heating time increases, the actual temperature value T_act of the heating element will change. Since the heater power is increased, the process returns to step S102 and the power judgment is performed again in step S103.

[0050] S107. If the actual temperature value T_act of the heater heating element 6 is greater than 100°C, determine whether the actual temperature value T_act of the heater heating element 6 satisfies: 100°C < T_act <= 105°C;

[0051] In this step, when T_act>100°C, a further temperature judgment is performed, that is, whether T_act satisfies: 100°C<T_act<=105°C, and different program steps are executed according to the result of the temperature judgment.

[0052] S108. If the actual temperature value T_act of the heater heating element 6 is greater than 105°C, the heater power is adjusted to decrease by 10% based on the current actual power P_act for every 1°C increase in the actual temperature of the heater heating element 6, and then the process returns to step S105.

[0053] In this step, T_act>105℃, that is, T_act is greater than the upper limit of the expected temperature range of the heating element 105℃. At this time, the temperature of the heating element needs to be lowered, which is achieved by adjusting and reducing the heater power. Specifically, for example, if the actual temperature T_act of the heating element is 106° and the current actual power P_act is P1, then adjust the heater power to P1 (1-10%); if the actual temperature T_act of the heating element is 107° and the current actual power P_act is P2, then adjust the heater power to P2 (1-20%), and so on. After adjusting to reduce the power, return to step S105 for temperature judgment. By adopting the above method to adjust and reduce the heater power, the temperature of the heating element can be well reduced, which can be beneficial to achieve the stability of the air outlet temperature, thereby increasing the heating comfort of the passengers.

[0054] S109. If the actual temperature value T_act of the heating element 6 of the heater satisfies: 100°C < T_act <= 105°C, then determine whether the actual temperature value T_act of the heating element is stable;

[0055] In this step, when 100°C<T_act<=105°C, the power is no longer adjusted, and it is directly determined whether T_act is stable.

[0056] As a preferred technical solution, in step S109, if the actual temperature value T_act of the heating element is unstable, return to step S103.

[0057] S1010. If the actual temperature value T_act of the heating element remains stable, the air outlet temperature becomes stable, and then the process loops to step S102.

[0058] When the actual temperature value T_act of the heating element is between 100°C and 105°C and remains stable, the air outlet temperature can be stabilized, which can increase the heating comfort of the passengers. After the air outlet temperature is stabilized, the process returns to step S102 and cyclically executes the above-mentioned adjustment procedure.

[0059] The present invention also provides a temperature control system based on an electric vehicle air heater, comprising an air conditioning controller 3 and an electric vehicle heater 1, wherein the electric vehicle heater 1 comprises a heater controller 5, a heater heating element 6 and a heating element temperature sensor 7;

[0060] The air conditioning controller 3 is used to send a request power value P_req of the heater heating power to the heater controller 5;

[0061] The heater controller 5 is used to receive the requested power value P_req of the heater heating power and set the desired temperature range T1-T2 of the heater heating element 6, and is also used to monitor the actual power value P_act of the heater and the actual temperature value T_act of the heater heating element 6 in real time, and is also used to control and adjust the heater power heating;

[0062] The heater heating element 6 receives the power control command of the heater controller 5 to perform heating, and the heating power of the heater heating element 6 is the actual power of the heater;

[0063] The heating element temperature sensor 7 is used to measure the actual temperature value T_act of the heating element 6 of the heater in real time and transmit it to the heater controller 5 .

[0064] The temperature control system based on the electric vehicle air heater can well implement the temperature control method based on the electric vehicle air heater of the above-mentioned embodiment. By combining temperature control and power control, it can not only meet the power limit requirements of the car or air conditioning controller 3 for the heater, but also achieve the stability of the heating element temperature and the air outlet temperature of the air heater, thereby increasing the heating comfort of the passengers. In this embodiment, the heater is arranged in the air conditioning box 4, and the heater controller 5, the heater heating element 6 and the heating element temperature sensor 7 are arranged in the heater. By setting the heating element temperature sensor 7, the actual temperature of the heating element can be well collected. After the incoming air (cold air) passes through the heater, it is heated by the heater, and the heat is taken away by the outlet air and becomes hot air, which will increase the temperature of the air outlet of the air conditioning box 4 and realize passenger heating. At the same time, the heat of the heater is constantly taken away by the incoming air. Due to the characteristics of the heater, the actual power of the heater will fluctuate.

[0065] In specific implementation, a communication signal line 2 is connected between the car or air conditioning controller 3 and the electric car heater 1, and signal transmission is performed on the communication signal line 2, and signal sending and signal receiving can be conveniently realized through the communication signal line 2. The communication signal line 2 can be a CAN communication line or a LIN communication line.

[0066] The present invention is based on the temperature control method of the electric vehicle air heater, comprising: the heater receives the request power value P_req sent by the car or air conditioning controller 3 in real time, adjusts the heater power and heats. Due to the characteristics of the heater, when the incoming air (cold air) takes away the heat of the heating element, the actual power value P_act of the heater will fluctuate. The heater monitors the change of the actual power value P_act in real time and compares it with the request power value P_req. If the actual power value P_act> the request power value P_req, the heater reduces the power until the actual power value P_act=the request power value P_req, so that the actual power does not exceed the request power value. At the same time, if the power is stable, the actual temperature T_act of the heating element will also be stable; if the actual power value P_act<=the request power value P_req, the actual temperature of the heating element 6 of the heater is judged. If T_act<=100°C, the heater power is increased for heating, and the request power value of the car or air conditioning controller 3 is continued to be responded. If the actual temperature of the heating element is 100°C<T_act<=105°C, the heater no longer adjusts the power. If the actual temperature of the heating element T_act>105°C, the actual temperature of the heating element 6 of the heater increases by 1°C, and the heater reduces the power by 10% based on the current actual power P_act. After the above logic adjustment and control, the heating element temperature T_act of the heater will be stable, and the heating element temperature and the air outlet temperature will be stable. This method can well achieve the stability of the heating element temperature of the air heater and the stable air outlet temperature.

[0067] Traditional air heaters do not have temperature control logic, but simply make the heater power value reach the requested power value. If the temperature is too high, the heating is directly turned off, and the heating is resumed after the temperature drops. Due to the characteristics of air heaters, the temperature change rate of the heating element is slower than the change of the electric power value. After the electric power of the heater is turned off, the temperature of the heating element will rise for a period of time and then drop; after the electric power is restored, the temperature of the heating element will drop for a period of time and then rise again, resulting in huge temperature fluctuations in the temperature of the heating element and the temperature of the air outlet, affecting the heating experience of the passengers. The temperature control method and system of the air heater of the present invention combine temperature control and power control. When the temperature of the heating element rises or falls, the power of the heater can be dynamically adjusted according to the temperature of the heating element and the power value, so as to achieve dynamic stability of the temperature of the heating element, which not only meets the power limit requirements of the car or air conditioner for the heater, but also realizes the stability of the temperature of the heating element and the temperature of the air outlet of the air heater, thereby increasing the heating comfort of the passengers.

[0068] Parts not involved in this embodiment are the same as the prior art or can be implemented by using the prior art, and will not be further described here.

[0069] Technical personnel should note that: Although the present invention has been described according to the above specific implementation methods, the inventive concept of the present invention is not limited to this invention, and any modification using the inventive concept will be included in the scope of protection of this patent right.

Claims

1. A temperature control method based on an electric vehicle air heater, characterized in that: Including: Setting the desired temperature range T1 - T2 of the heater heating element; receiving the requested power value P_req of the heater heating power; monitoring the actual power value P_act of the heater in real time and adjusting the heater heating power so that the actual power value P_act <= the requested power value P_req; monitoring the actual temperature value T_act of the heater heating element in real time, and controlling the actual temperature of the heating element to be between T1 and T2 and remain stable when the actual power value P_act <= the requested power value P_req; Including the following steps: S1. Setting the desired temperature range T1 - T2 of the heater heating element; wherein, in step S1, setting the desired temperature range of the heater heating element to be 100°C - 105°C; S2. Receiving the requested power value P_req of the heater heating power; S3. Judging whether the actual power value P_act of the heater > the requested power value P_req holds; S4. If the actual power value P_act <= the requested power value P_req, then judging whether the actual temperature value T_act of the heater heating element is not greater than the lower limit value T1 of the desired temperature range of the heating element; S5. If the actual temperature value T_act of the heater heating element is greater than the lower limit value T1 of the desired temperature range of the heating element, then judging whether the actual temperature value T_act of the heater heating element satisfies: T1 < T_act <= T2; S6. If the actual temperature value T_act of the heater heating element satisfies: T1 < T_act <= T2, then judging whether the actual temperature value T_act of the heating element is stable; S7. If the actual temperature value T_act of the heating element remains stable, then the air outlet temperature reaches stability, and then loop back to step S2; In step S3, if the actual power value P_act > the requested power value P_req, then reduce the heater power until the actual power value P_act = the requested power value P_req, and then return to step S2; In step S4, if the actual temperature value T_act of the heater heating element <= T1, then increase the heater power and heat, and then return to step S2; In step S5, if the actual temperature value T_act of the heater heating element > T2, then for every 1°C increase in the actual temperature of the heater heating element, adjust the heater power to decrease by 10% based on the current actual power P_act, and then return to step S4.

2. A temperature control method based on an electric vehicle air heater according to claim 1, characterized in that: In step S1, the setting of the desired temperature range T1 - T2 of the heater heating element is set by the heater controller.

3. A temperature control method based on an electric vehicle air heater according to claim 1, characterized in that: In step S2, the receiving of the requested power value P_req of the heater heating power is that the heater controller receives the requested power value P_req sent by the air conditioner controller.

4. A temperature control method based on an electric vehicle air heater according to claim 1, characterized in that: In step S6, if the actual temperature value T_act of the heating element is unstable, then return to step S3.

5. A temperature control system based on an electric vehicle air heater, characterized in that: Including an air conditioner controller and an electric vehicle heater, the electric vehicle heater includes a heater controller, a heater heating element, and a heating element temperature sensor; The air conditioner controller is used to send the requested power value P_req of the heater heating power to the heater controller; The heater controller is used to receive the requested power value P_req of the heater heating power and set the desired temperature range T1 - T2 for the temperature of the heater heating element, and is also used to monitor the actual power value P_act of the heater and the actual temperature value T_act of the heater heating element in real time, and is also used to control and adjust the heater power for heating; The heater heating element receives the power control command of the heater controller for heating, and the heating power of the heater heating element is the actual power of the heater; The heating element temperature sensor is used to measure the actual temperature value T_act of the heater heating element in real time and transmit it to the heater controller; Specifically, it includes the following steps: S1. Set the desired temperature range T1 - T2 for the temperature of the heater heating element; among them, in step S1, the desired temperature range for the temperature of the heater heating element is set to 100°C - 105°C; S2. Receive the requested power value P_req of the heater heating power; S3. Judge whether the actual power value P_act of the heater > the requested power value P_req holds; S4. If the actual power value P_act <= the requested power value P_req, then judge whether the actual temperature value T_act of the heater heating element is not greater than the lower limit value T1 of the desired temperature range of the heating element; S5. If the actual temperature value T_act of the heater heating element is greater than the lower limit value T1 of the desired temperature range of the heating element, then judge whether the actual temperature value T_act of the heater heating element satisfies: T1 < T_act <= T2; S6. If the actual temperature value T_act of the heater heating element satisfies: T1 < T_act <= T2, then judge whether the actual temperature value T_act of the heating element is stable; S7. If the actual temperature value T_act of the heating element remains stable, the air outlet temperature reaches stability, and then loop back to step S2; In step S3, if the actual power value P_act > the requested power value P_req, then reduce the heater power until the actual power value P_act = the requested power value P_req, and then return to step S2; In step S4, if the actual temperature value T_act of the heater heating element <= T1, then increase the heater power and heat, and then return to step S2; In step S5, if the actual temperature value T_act of the heater heating element > T2, then for every 1°C increase in the actual temperature of the heater heating element, adjust the heater power to decrease by 10% based on the current actual power P_act, and then return to step S4.

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