Refrigeration control method for hybrid light truck air conditioner

Abstract

The application discloses a hybrid light truck air conditioner refrigeration control method. The main design concept of the application is that when it is detected that an air conditioner AC switch is turned on, a condenser fan additionally arranged in front of a condenser of a front-end cooling module is controlled to operate, and the engine operating state is synchronously judged, so that the rotation direction of the condenser fan is decided in real time. Specifically, when the condenser fan is controlled to operate in a positive rotation air blowing mode, the rotation speed of the condenser fan is further increased, and when the condenser fan is controlled to operate in a reverse rotation air sucking mode, a heat dissipation valve plate additionally arranged in front of the condenser fan is turned on to assist the heat dissipation effect. The application can effectively ensure the refrigeration effect of the hybrid light truck air conditioner, avoid the increase of oil consumption caused by frequent starting of the engine, and be consistent with the design intention of saving electricity and fuel of the hybrid vehicle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hybrid vehicle refrigeration, and particularly relates to a hybrid light truck air conditioner refrigeration control method. BACKGROUND

[0002] Compared with fuel vehicles, the hybrid light truck air conditioner system should have better performance. Mainly speaking, in order to meet the refrigeration requirements of the battery pack and the cab, a larger condenser is needed. Limited by the space of the whole vehicle, the existing scheme is to arrange the larger air conditioner condenser in front of the engine radiator and the intercooler of the hybrid light truck, so as to form a front-end cooling module, that is, the module is composed of the air conditioner condenser, the intercooler and the radiator from front to back, and the engine is behind the module.

[0003] However, the front-end cooling module is cooled by a single engine fan, and the effect is not reasonable. SUMMARY

[0004] In view of the above, the present application aims to provide a hybrid light truck air conditioner refrigeration control method to solve the technical problems mentioned above.

[0005] The technical solution adopted by the present application is as follows:

[0006] The present application provides a hybrid light truck air conditioner refrigeration control method, which comprises:

[0007] When it is detected that the air conditioner AC switch is turned on, the condenser fan additionally arranged in front of the air conditioner condenser of the front-end cooling module is controlled to operate, and the engine operating state is judged synchronously;

[0008] According to the engine operating state, the rotation direction of the condenser fan is decided in real time;

[0009] When the condenser fan is rotating forward, the rotation speed of the condenser fan is increased;

[0010] When the condenser fan is rotating reversely, the radiator valve plate prearranged in front of the condenser fan is opened.

[0011] In at least one possible implementation, the decision of the rotation direction of the condenser fan according to the engine operating state comprises:

[0012] When the rotation speed of the engine is greater than 0, the condenser fan is controlled to rotate forward to form a blowing mode towards the engine;

[0013] When the rotation speed of the engine is equal to 0, the condenser fan is controlled to rotate reversely to form a reverse suction mode.

[0014] In at least one possible implementation, the control method further comprises:

[0015] detecting whether the refrigeration effect meets the standard in real time when the rotation speed of the engine is equal to 0;

[0016] If the standard is not met, the engine is forcibly started to make the engine fan work.

[0017] In at least one possible implementation, the detection of whether the refrigeration effect meets the standard comprises detection based on at least one of the following detection objects: battery pack temperature drop, cabin temperature drop, condenser body temperature.

[0018] In at least one possible implementation, the rotation speed of the condenser fan is increased as follows:

[0019] Based on the refrigeration effect detected in real time, the wind speed gear of the condenser fan is increased according to a preset ladder level.

[0020] In at least one possible implementation, the opening of the heat dissipation valve plate pre-installed in front of the condenser fan comprises:

[0021] Based on the refrigeration effect detected in real time, the opening of the heat dissipation valve plate is increased according to a preset ladder level.

[0022] In at least one possible implementation, the control method further comprises:

[0023] When the condenser fan is reversed, the wind speed of the condenser fan is adjusted based on the refrigeration effect detected in real time.

[0024] Compared with the prior art, the main design concept of the present application is that when it is detected that the air conditioner AC switch is turned on, the condenser fan additionally arranged in front of the air conditioner condenser of the front-end cooling module is controlled to operate, and the engine operation state is judged synchronously, so as to make a real-time decision on the direction of the condenser fan. Specifically, when the condenser fan is controlled to operate in a forward blowing mode, the rotation speed of the condenser fan is further increased, and when the condenser fan is controlled to operate in a reverse suction mode, a heat dissipation valve plate additionally pre-installed in front of the condenser fan is opened to assist the heat dissipation effect. The present application can effectively ensure the refrigeration effect of the hybrid light truck air conditioner, avoid frequent engine starting to increase fuel consumption, and be consistent with the design intention of saving electricity and reducing oil consumption of hybrid vehicles. BRIEF DESCRIPTION OF DRAWINGS

[0025] To make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described below with reference to the drawings, in which:

[0026] Figure 1 A flowchart of a hybrid light truck air conditioner refrigeration control method provided by an embodiment of the present application is shown. DETAILED DESCRIPTION

[0027] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be interpreted as a limitation on the present application.

[0028] The present application proposes an embodiment of a hybrid light truck air conditioner refrigeration control method, specifically as shown in Figure 1 , which includes:

[0029] Step S1, when detecting that the air conditioner AC switch is turned on, control the condenser fan additionally arranged in front of the front-end cooling module to operate, and simultaneously determine the engine operating state;

[0030] Step S2, according to the engine operating state, decide the rotation direction of the condenser fan in real time;

[0031] Step S3, when the condenser fan is forward rotation, increase the rotation speed of the condenser fan;

[0032] Step S4, when the condenser fan is reverse rotation, open the heat dissipation valve plate (communicates with the external environment, opens the heat of the front-end cooling module to the outside, for example, consider setting the front grille with adjustable opening and closing and opening degree, or additionally configure the air door at the vehicle body, etc.) prearranged in front of the condenser fan.

[0033] Regarding the decision of the rotation direction of the condenser fan according to the engine operating state, specifically:

[0034] When the engine speed is greater than 0, control the condenser fan to forward rotation to form a blowing mode towards the engine direction, so as to work together with the engine fan on the condenser.

[0035] When the engine speed is equal to 0, control the condenser fan to reverse rotation to form a reverse suction mode, so as to utilize the spacing between the condenser and the intercooler of the front-end cooling module to the outside (that is, to the direction away from the engine).

[0036] Based on this concept, it can also be optimized that when the engine speed is equal to 0, the refrigeration effect is detected in real time whether it meets the standard (for example, the refrigeration effect can be represented by at least one factor such as battery pack temperature drop, cabin temperature drop, condenser body temperature, etc. whether it meets the standard);

[0037] If it does not meet the standard, the engine is forced to start to make the engine fan work. (It can be understood that due to the change of the engine state to the speed greater than 0, the rotation direction switching of the condenser fan will occur at this time)

[0038] The derivation process of the design idea of the above embodiment is that the cooling effect of a single engine fan is not ideal, and based on this, an additional condenser fan is added as a main heat dissipation fan. When the AC switch is turned on and the air conditioner compressor starts to work, the vehicle controller controls the condenser fan relay to be attracted, and the condenser fan is turned on.

[0039] If the condenser fan only has a blowing mode, as described above in the front-end cooling module of the hybrid light truck, the rear of the condenser is the intercooler and radiator, which will block the flow of wind to some extent and form a large wind pressure. Therefore, the direction of the condenser fan is changed based on the operation of the engine. When the engine is running (generally in driving conditions), the engine fan is started, so the condenser fan can be turned on to make the directions of the two fans consistent. When the engine is stopped (generally in parking conditions), the condenser fan is reversed to rely on suction to carry away heat. In actual operation, the switching of the condenser fan direction can be realized by using mature electric control devices (such as relays, etc.).

[0040] Based on this concept, under parking conditions (engine speed is 0), the heat dissipation effect is detected to use the engine fan as an auxiliary fan only in certain conditions to dissipate heat from the condenser. At this time, the engine is forced to start, and negative pressure is generated behind the radiator. According to the above control logic, the engine state changes, and the direction of the condenser fan also changes, so that the condenser fan can cooperate with the engine fan to blow cold air from the outside to the condenser for timely heat dissipation.

[0041] Finally, it can be supplemented that in step S3, when the condenser fan is turned on, the speed of the condenser fan is increased. Since the condenser fan is turned on, it blows air towards the engine. Due to the spatial layout of the front-end cooling module, the blowing effect of the condenser fan is inevitably hindered (even if it cooperates with the engine fan). Therefore, in some preferred embodiments of the present application, based on real-time detection of the refrigeration effect (the specific detection object is as described above, which is not repeated here), the wind speed gear of the condenser fan is increased according to the preset step level (in implementation, the wind speed of the condenser fan can be increased according to the corresponding multiple gears by using frequency conversion, etc. according to the quantized different refrigeration effect feedback signals, and the change of fan speed needs to follow the actual design standard);

[0042] And for step S4, when the condenser fan is reversed, open the heat dissipation valve plate pre-installed in front of the condenser fan, because the reverse is to suck the air in the opposite direction of the engine, which forms an outward heat dissipation effect, and at this time the engine fan does not participate, only relying on the suction effect of the condenser fan, so in other preferred embodiments of the present application, based on the real-time detection of the refrigeration effect (the specific detection object is as described above, and will not be repeated here), according to the pre-set step level, increase the opening of the heat dissipation valve plate (when implemented, the actuator can be used to cooperate with the mature mechanical structure of the air door, and the opening of the heat dissipation valve plate is increased according to the different refrigeration effect feedback signal after quantization, so as to cooperate with the condenser fan in the air suction mode to efficiently dissipate heat to the outside. Of course, the opening range also follows the actual design standard).

[0043] Of course, those skilled in the art can understand that in the air suction mode, the condenser fan speed can also be adjusted based on the refrigeration effect, so as to further improve the effect of outward air suction and heat dissipation.

[0044] In summary, the main design concept of the present application is that when it is detected that the air conditioner AC switch is turned on, the condenser fan additionally arranged in front of the front-end cooling module is controlled to operate, and the engine operating state is judged synchronously, so as to make a real-time decision on the direction of the condenser fan. Specifically, when the condenser fan is controlled to operate in the positive rotation air blowing mode, the rotation speed of the condenser fan is further increased, and when the condenser fan is controlled to operate in the reverse rotation air suction mode, the heat dissipation valve plate additionally pre-installed in front of the condenser fan is opened to assist the heat dissipation effect. The present application can effectively ensure the refrigeration effect of the hybrid light truck air conditioner, avoid the increase of oil consumption caused by frequent engine starting, and be consistent with the design intention of saving energy and fuel of the hybrid vehicle.

[0045] In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. The "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which means that A exists alone, A and B exist together, and B exists alone. Wherein A, B can be singular or plural. The character " / " generally represents that the front and rear associated objects are in an "or" relationship. "At least one of the following" and the like means any combination of these items, including single or multiple combinations. For example, at least one of a, b and c can mean: a, b, c, a and b, a and c, b and c, or a and b and c, wherein a, b, c can be single or multiple.

[0046] The above detailed description of the embodiments shown in the drawings illustrates the structure, features and effects of the present application, but the above is only a preferred embodiment of the present application, and it should be noted that the technical features involved in the above embodiments and preferred modes can be reasonably combined and matched into various equivalent schemes by those skilled in the art without departing from or changing the design idea and technical effects of the present application; therefore, the present application is not limited to the implementation range shown in the drawings, and any changes or modifications made in accordance with the concept of the present application, or equivalent embodiments with equivalent changes, shall be within the scope of protection of the present application.

Claims

1. A hybrid light truck air conditioning refrigeration control method, characterized in that, The application relates to a control method of a cooling system of a vehicle, comprising the following steps: When the air conditioner (AC) switch is turned on, a condenser fan arranged in front of a condenser of a front-end cooling module is controlled to rotate as a main heat dissipation fan; According to the engine running state, the rotation direction of the condenser fan is decided in real time, including: when the engine speed is greater than 0, the condenser fan is controlled to rotate forward to form a blowing mode towards the engine; when the engine speed is equal to 0, the condenser fan is controlled to rotate reversely to form a reverse suction mode; When the condenser fan rotates forward, the rotation speed of the condenser fan is increased; When the condenser fan rotates reversely, a heat dissipation valve plate arranged in front of the condenser fan is opened, including: according to the real-time detected refrigeration effect, the opening degree of the heat dissipation valve plate is increased according to a preset ladder level; The control method further comprises the following steps: When the engine speed is equal to 0, whether the refrigeration effect meets the standard is detected in real time; If the standard is not met, the engine is forced to start to make the engine fan work; wherein, whether the refrigeration effect meets the standard is detected based on at least one of the following detection objects: battery pack temperature drop, cabin temperature drop and condenser body temperature.

2. The hybrid light truck air conditioning refrigeration control method of claim 1, wherein, The control method further comprises the following steps: When the condenser fan rotates reversely, the wind speed of the condenser fan is adjusted based on the real-time detected refrigeration effect.

3. The hybrid light truck air conditioning refrigeration control method of claim 1 or 2, wherein, The control method further comprises the following steps: When the condenser fan rotates reversely, the wind speed of the condenser fan is adjusted based on the real-time detected refrigeration effect.

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