Electric automobile air PTC temperature control sensor mounting structure and automobile air conditioner

Abstract

The utility model relates to an electric automobile air PTC temperature control sensor installation structure and an automobile air conditioner, and the air PTC temperature control sensor installation structure comprises a fixed rod and a sensor installation block. The temperature control sensor is arranged on a shell in the middle of the windward side of the PTC core body, directly detects the temperature of the windward side of the PTC core body, and performs control when the temperature is close to an ideal target temperature (at the moment, the PTC plays the maximum heating power and efficiency), so that the stability of PTC surface temperature control is kept, the stability of the temperature of an air outlet is ensured, the frequency of repeated starting of the PTC is reduced, and the service life of the PTC core body is prolonged. The working efficiency of the PTC is improved, the power consumption of the PTC is reduced, and therefore the endurance of the whole vehicle is indirectly improved. The temperature control sensor is arranged in the middle of the windward side of the PTC core body, in a PTC mode, the temperature stability of the air outlet of the whole vehicle is greatly improved, and in the PTC mode, due to the fact that the PTC keeps stable power output all the time, consumed energy is improved to a certain extent compared with energy consumed before optimization.

Description

TECHNICAL FIELD

[0001] The utility model relates to an electric automobile, concretely relates to an electric automobile air PTC temperature control sensor mounting structure and automobile air conditioner. BACKGROUND

[0002] For the traditional fuel vehicle air conditioning system, in the heating function aspect, usually rely on the heat of engine operation to provide heating function for the vehicle. For pure electric vehicle, since the whole vehicle has no engine parts, actual driving is unable to rely on the engine operation to meet the heating demand, so the electric vehicle needs to adopt a new heat generation mode.

[0003] The current mainstream scheme is to heat by PTC (Positive Temperature Coefficient), and PTC refers to positive temperature coefficient material. The glass and other articles that we usually see belong to negative temperature coefficient material, which is called NTC. The characteristic of NTC is that the higher the temperature, the smaller the resistance, so NTC will cause the temperature to be higher and the current to be larger until burning damage once being electrified. The PTC material is the higher the temperature, the larger the resistance, so it can form a steady state through its temperature coefficient characteristics, which can meet the demand of electric vehicle for heating function and safety. The common PTC material is a semiconductor ceramic. The resistance value of PTC heater increases sharply with the rise of its own temperature. Therefore, when the temperature rises, the heating power will also decrease sharply; when the heating power and the heat dissipation power reach a balance, the temperature will no longer rise, and the power will no longer change. When the heat dissipation conditions (such as environmental temperature, blowing, immersion, etc.) change, the power and temperature of PTC are adjusted again to reach a new balance.

[0004] The PTC scheme heating mode is divided into air PTC and water PTC. The water PTC scheme needs to increase the water pump, pipeline, coolant and other components, which improves the complexity and cost of the system. The air PTC does not need to increase additional parts, has the characteristics of low cost and high reliability. At present, the electric vehicle produced by our company adopts the air PTC scheme.

[0005] In the heating mode, PTC triggers over-temperature after working for a period of time, which leads to the shutdown of PTC. When the temperature decreases to a certain temperature, it is restarted again. The above phenomenon will cause the following two problems:

[0006] 1. The temperature fluctuation of air outlet is large, the stability is poor, and the comfort experience is affected;

[0007] 2. The starting current of PTC is large, the temperature stabilization time is long, and the energy consumption is large, which reduces the driving range of the whole vehicle obviously. This is also the point that many electric vehicle owners complain about in winter.

[0008] The PTC temperature sensor in the market is mostly arranged at the side of the PTC heating sheet, and measures the temperature at the local edge position of the PTC, which is quite different from the temperature at the main position of the core body in heat exchange with the PTC, and the side temperature does not have an accurate corresponding relationship with the PTC core body surface temperature with the change of the air volume and the requested power. The PTC core body surface temperature cannot be simulated by error compensation, so the sensor needs to be arranged at the windward position of the PTC to measure the actual temperature of the core body in order to accurately monitor the temperature of the PTC surface and realize constant temperature control.

[0009] The control strategy of the PTC at present is that when the PTC works, the PTC works according to the requested power after receiving the PTC power request, and when the temperature of the side temperature sensor reaches 85 DEG C, the PTC core body surface temperature may be only about 100 DEG C, and the PTC has not fully exerted the maximum heating performance, but the control strategy at present will make the PTC stop working, and the PTC will restart when the temperature decreases to a certain temperature. Practical new type content

[0010] In order to solve the above problems, the utility model provides a kind of electric automobile air PTC temperature control sensor mounting structure and automobile air conditioner, by optimizing PTC temperature sensor structure and position, keep the stability of PTC surface temperature control, ensure that outlet temperature is stable, reduce the frequency of PTC repeated start, improve the working efficiency of PTC, reduce the power consumption of PTC, to indirectly improve the vehicle endurance.

[0011] The technical scheme adopted by the utility model is: a kind of electric automobile air PTC temperature control sensor mounting structure, characterized by: including fixed rod and sensor mounting block, the fixed rod top is fixed on PTC core windward side middle part shell, the fixed rod bottom is connected with sensor mounting block by wire harness;Temperature control sensor probe is installed on the sensor mounting block, and the temperature control sensor probe is inserted between the heat dissipation fins of the PTC core;Limiting rod is provided on the sensor mounting block, and the limiting rod is inserted between the heat dissipation fins of the PTC core and fixed. Temperature control sensor is arranged on the PTC core windward side middle part shell, and temperature control sensor directly detects the temperature of the PTC core windward side, controls when approaching ideal target temperature (at this time, PTC exerts the maximum heating power and efficiency), keeps the stability of PTC surface temperature control, ensures that outlet temperature is stable, reduces the frequency of PTC repeated start, improves the working efficiency of PTC, reduces the power consumption of PTC, to indirectly improve the vehicle endurance.

[0012] As a preferred, the limiting rod is in the conical structure of thick root and thin end. It ensures that the sensor mounting block can be smoothly inserted between the heat dissipation fins.

[0013] As preferred, the limiting rod is uniformly provided with a plurality of barb-shaped steps along the length direction, which ensures that the sensor mounting block can be firmly fixed between the heat dissipation fins and not fall off.

[0014] As preferred, the sensor mounting block is provided with a first weight-reducing groove and a second weight-reducing groove, which can reduce the overall weight and save materials.

[0015] As preferred, the first weight-reducing groove is provided with a first wire clamping groove on the groove wall, the wall between the first weight-reducing groove and the second weight-reducing groove is provided with a second wire clamping groove, and the second weight-reducing groove is provided with a third wire clamping groove; one end of the wire harness is connected with the temperature control sensor probe, and the other end is sequentially connected with the fixing rod through the first wire clamping groove, the second wire clamping groove and the third wire clamping groove, which ensures that the wire harness can be firmly fixed on the sensor mounting block.

[0016] As preferred, the sensor mounting block is provided with a wire harness guide frame at the top, which prevents the wire harness from being scattered after being pulled out of the sensor mounting block.

[0017] As preferred, the fixing rod is provided with a first clamping table and a second clamping table at the top, which are clamped with the PTC core shell, so as to ensure that the fixing rod can be firmly fixed with the PTC core shell.

[0018] As preferred, the first clamping table is arranged above the second clamping table, and the width of the first clamping table is smaller than that of the second clamping table, which is convenient to install and firmly fixed.

[0019] As preferred, the fixing rod is provided with a limiting groove at the bottom, which is matched with the PTC core shell, so as to ensure that the fixing rod is firmly fixed with the PTC core shell.

[0020] The utility model provides a kind of automobile air conditioner, it is characterized by: having the electric vehicle air PTC temperature control sensor mounting structure described above.

[0021] The utility model discloses the beneficial effect obtained is: the temperature control sensor is arranged on the middle casing of the PTC core windward side, and the temperature control sensor directly detects the temperature of the PTC core windward side, controls when approaching ideal target temperature 110 DEG C (when PTC exerts the maximum heating power and efficiency), keeps the stability of PTC surface temperature control, ensures the outlet temperature stability, reduces the frequency of PTC repeated start, improves the working efficiency of PTC, reduces the power consumption of PTC, thereby indirectly improves the whole vehicle endurance, the control strategy of current PTC is when PTC works, receives PTC power request, and PTC works according to the request power, when the temperature of side temperature sensor reaches 85 DEG C, PTC core surface temperature may be only about 100 DEG C, PTC has not completely exerted the maximum heating performance, but the current control strategy will make PTC stop working, and PTC will restart when the temperature reduces to a certain temperature, the utility model discloses the temperature control sensor is arranged in the middle of the PTC core windward side, and the temperature stability of the whole vehicle outlet is greatly improved under the PTC mode, under the PTC mode, since PTC always keeps stable power output, in the same time, the energy consumption is improved compared with before optimization. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 It is the structural schematic diagram of the utility model;

[0023] Fig. 2 It is the schematic diagram of PTC temperature control sensor mounting structure arrangement on PTC core;

[0024] Fig. 3 It is the assembly schematic diagram of PTC temperature control sensor mounting structure and PTC core;

[0025] Wherein: 1, fixed rod;11, first card station;12, second card station;13, limit slot;2, sensor mounting block;21, temperature sensor probe;22, limit rod;23, first lightening slot;24, second lightening slot;25, first wire slot;26, second wire slot;27, third wire slot;28, wire harness guide frame;3, wire harness;4, PTC core;41, PTC core casing;42, PTC core cooling fin. DETAILED DESCRIPTION

[0026] The utility model will be described further in connection with the drawings and specific embodiment.

[0027] As Figs. 1-3As shown, the utility model discloses a kind of air PTC temperature control sensor mounting structures of electric vehicle, including fixed rod 1 and sensor mounting block 2, fixed rod 1 top is fixed on the middle casing 41 of PTC core body 4 windward side, and fixed rod 1 bottom is connected with sensor mounting block 2 by wiring harness 2;Sensor mounting block 2 is installed with temperature control sensor probe 21, and temperature control sensor probe 21 is inserted between the radiating fin 42 of PTC core body 4;Limiting rod 22 is equipped on sensor mounting block 2, and limiting rod 22 is inserted between the radiating fin 42 of PTC core body 3 and fixed.It is arranged on the middle casing 41 of PTC core body 4 windward side to control sensor, temperature control sensor directly detects PTC core body 4 windward side temperature, controls when approaching ideal target temperature (PTC plays out maximum heating power and efficiency at this time), maintains the stability of PTC surface temperature control, ensures that outlet temperature is stable, reduces the frequency of PTC repeated start, improves the working efficiency of PTC, reduces the power consumption of PTC, to indirectly improve the endurance of whole vehicle.

[0028] In the embodiment, the limiting rod 33 is in the conical structure of thick root and thin end, which can ensure that the sensor mounting block 2 can be smoothly inserted between the radiating fins 42; a plurality of barb-shaped steps are uniformly arranged on the limiting rod 3 in the length direction, so that the sensor mounting block 2 can be firmly fixed between the radiating fins 42 and not fall off.

[0029] In the embodiment, the sensor mounting block 2 is provided with a first weight-reducing groove 23 and a second weight-reducing groove 24, which can reduce the overall weight and save materials; the first weight-reducing groove 23 is provided with a first wire clamping groove 25 on the groove wall, the wall between the first weight-reducing groove 23 and the second weight-reducing groove 24 is provided with a second wire clamping groove 26, and the second weight-reducing groove 23 is provided with a third wire clamping groove 27; one end of the wiring harness 3 is connected with the temperature control sensor probe 21, and the other end is sequentially connected with the fixed rod 1 through the first wire clamping groove 25, the second wire clamping groove 26 and the third wire clamping groove 27. It is ensured that the wiring harness 3 can be firmly fixed on the sensor mounting block 2.

[0030] In the embodiment, the sensor mounting block 2 is provided with a wire harness guide frame 28 on the top, which prevents the wiring harness 3 from being scattered after passing out of the sensor mounting block 2.

[0031] In the embodiment, the fixed rod 1 is provided with a first clamping table 11 and a second clamping table 12 on the top, which are clamped with the PTC core body casing 41, so that the fixed rod 1 can be firmly fixed with the PTC core body casing 41; the first clamping table 11 is arranged above the second clamping table 12, and the width of the first clamping table 11 is smaller than that of the second clamping table 12, so that the installation is convenient and firm.

[0032] In the embodiment, the fixed rod 1 is provided with a limiting groove 13 matched with the PTC core body casing 41 on the bottom, so that the fixed rod 1 can be firmly fixed with the PTC core body casing 41.

[0033] The utility model provides a kind of automobile air conditioner, with the electric automobile air PTC temperature control sensor mounting structure described above.

[0034] The basic principle and main structural features of the utility model are shown and described above. The utility model is not limited by the above examples, and various changes and improvements can be made without departing from the spirit and scope of the utility model. These changes and improvements are within the scope of the claimed utility model. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A mounting structure for an air PTC temperature control sensor in an electric vehicle, characterized in that: The device includes a fixing rod and a sensor mounting block. The top of the fixing rod is fixed to the middle of the housing on the windward side of the PTC core, and the bottom of the fixing rod is connected to the sensor mounting block via a wire harness. A temperature control sensor probe is mounted on the sensor mounting block and extends between the heat dissipation fins of the PTC core. A limiting rod is provided on the sensor mounting block and is inserted between the heat dissipation fins of the PTC core for fixation.

2. The mounting structure for the electric vehicle air PTC temperature control sensor according to claim 1, characterized in that: The limiting rod has a conical structure that is thick at the root and thin at the end.

3. The mounting structure for the electric vehicle air PTC temperature control sensor according to claim 2, characterized in that: The limiting rod is uniformly provided with multiple barbed steps along its length.

4. The mounting structure for the electric vehicle air PTC temperature control sensor according to claim 1, characterized in that: The sensor mounting block is provided with a first weight reduction groove and a second weight reduction groove.

5. The mounting structure for the electric vehicle air PTC temperature control sensor according to claim 4, characterized in that: The first weight-reducing groove has a first wire-locking groove on its wall, the second wire-locking groove is provided on the wall between the first weight-reducing groove and the second weight-reducing groove, and the second weight-reducing groove has a third wire-locking groove on its wall; one end of the wire harness is connected to the temperature control sensor probe, and the other end passes through the first wire-locking groove, the second wire-locking groove and the third wire-locking groove in sequence to connect to the fixing rod.

6. The mounting structure for the electric vehicle air PTC temperature control sensor according to claim 1, characterized in that: The sensor mounting block is equipped with a wire harness guide frame on top.

7. The mounting structure for the electric vehicle air PTC temperature control sensor according to claim 1, characterized in that: The top of the fixing rod is provided with a first locking platform and a second locking platform that engage with the PTC core housing.

8. The mounting structure for the electric vehicle air PTC temperature control sensor according to claim 7, characterized in that: The first card holder is positioned above the second card holder, and the width of the first card holder is smaller than that of the second card holder.

9. The mounting structure for the electric vehicle air PTC temperature control sensor according to claim 1, characterized in that: The bottom of the fixing rod is provided with a limiting groove that mates with the PTC core housing.

10. An automotive air conditioner, characterized in that: It has the electric vehicle air PTC temperature control sensor mounting structure as described in any one of claims 1 to 9.

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