VCU control method for new energy automobile air conditioning refrigeration system

Abstract

The application discloses a new energy automobile air conditioner refrigerating system VCU control method, in the process of vehicle driving, the speed parameter and the temperature parameter in the vehicle are used to control the air conditioner system refrigeration; the VCU detects the surface temperature of the air conditioner evaporating dish, and then controls the compressor rotating speed, so as to achieve the purpose of shock absorption and noise reduction. By changing the control strategy of the VCU to the air conditioner system, the vibration and noise caused by the compressor body during idling and low-speed driving are effectively reduced, a quiet and comfortable driving space is provided for the driver and passenger, the comfort and drivability of the driver and passenger are improved, the air conditioner pipeline is protected, damage caused by over-refrigeration of the compressor is avoided, the cost caused by redesign and development of the compressor and re-vehicle arrangement is effectively reduced, and the application can be popularized and applied in solving similar problems of other new energy projects.

Description

Technical Field

[0001] This invention belongs to the technical field of temperature regulation in air conditioning refrigeration systems for new energy vehicles. Specifically, this invention relates to a VCU control method for an air conditioning refrigeration system in a new energy vehicle. Background Technology

[0002] Currently, the air conditioning compressor assembly and electric motor of new energy vehicles are connected to the mounting bracket and located in the front compartment. Patent documents related to air conditioning refrigeration control technology in new energy vehicles include:

[0003] 1. A cooling control method for new energy vehicles (CN10881965A);

[0004] 2. A control method for an electric compressor in a new energy vehicle (CN107696931A);

[0005] 3. An air conditioning control system for a pure electric vehicle (CN207173224U);

[0006] 4. A temperature control system for new energy vehicles (CN108215713A)

[0007] The technical solutions described in the aforementioned publicly available technical documents all have the following defects:

[0008] When the air conditioning system is in cooling mode, the air conditioning compressor motor itself will generate a certain amount of vibration and noise. The vibration is transmitted to the car and causes the steering wheel and seats to shake, reducing the comfort of the passengers. The noise near the passenger compartment will be directly transmitted to the passenger compartment, which will cause serious irritation and discomfort to the passengers. Summary of the Invention

[0009] This invention provides a VCU control method for a new energy vehicle air conditioning refrigeration system, the purpose of which is to improve the comfort of driving and riding.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0011] The VCU control method for the air conditioning refrigeration system of new energy vehicles of the present invention uses the vehicle speed parameters and the in-vehicle temperature parameters to jointly control the air conditioning system refrigeration during vehicle operation.

[0012] The VCU detects the surface temperature of the air conditioner evaporator and then controls the compressor speed to achieve the purpose of vibration reduction and noise reduction.

[0013] When a passenger turns on the passenger compartment cooling knob, the signal is transmitted to the VCU. The VCU control program first judges the vehicle speed signal. There are two operating conditions for judging the vehicle speed: the first condition is a vehicle speed ≥ 20 km / h; the second condition is a vehicle speed < 20 km / h up to 0. Under both conditions, the VCU detects the surface temperature of the air conditioning evaporator and then controls the compressor speed to achieve the purpose of vibration reduction and noise reduction.

[0014] 1) Under operating conditions where the vehicle speed is ≥20km / h:

[0015] When the temperature is above 13℃, the compressor operates at a speed of 4500 rpm to ensure the cooling effect of the air conditioner.

[0016] When the interior temperature is between 7°C and 13°C, the compressor operates at a speed of 3000 rpm to ensure the cooling effect of the air conditioner.

[0017] When the interior temperature is below 7°C, the compressor operates at a speed of 1000 rpm to ensure that the pipes are not damaged by freezing.

[0018] 2) Under the condition of vehicle speed <20km / h, up to vehicle speed = 0:

[0019] When the interior temperature is above 7°C, the compressor operates at a speed of 3000 rpm, sacrificing some of the air conditioning cooling performance (cooling above 13°C) to reduce vibration and noise inside the vehicle and ensure the comfort of the passenger cabin.

[0020] When the interior temperature is below 7°C, the compressor operates at a speed of 1000 rpm to ensure that the pipes are not damaged by freezing.

[0021] Once the set vehicle speed and evaporator temperature are reached, a 10-second delay is set before the program switches to execute the command. This is to prevent frequent and drastic changes in compressor speed that could damage the compressor itself when the vehicle speed fluctuates around 20 km / h.

[0022] This invention employs the aforementioned technical solution, which, by altering the VCU's control strategy for the air conditioning system, effectively reduces vibration and noise caused by the compressor itself during idling and low-speed driving while maintaining the air conditioning cooling effect. This provides a quiet and comfortable driving space for passengers, improving driving comfort and drivability; protects the air conditioning pipes from damage caused by overcooling of the compressor; and effectively reduces costs associated with redesigning and developing the compressor and rearranging the entire vehicle. This technical solution can be promoted and applied to solve similar problems in other new energy projects. Attached Figure Description

[0023] The following is a brief explanation of the contents shown in the attached figure and the markings therein:

[0024] Figure 1 This is a schematic diagram of the control strategy of the present invention.

[0025] The diagram is marked as follows:

[0026] 1. Cooling signal input, 2. Vehicle speed, 3. Air conditioning evaporator surface temperature, 4. Compressor speed, 5. Control signal output. Detailed Implementation

[0027] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0028] This invention relates to the field of temperature regulation in air conditioning systems for new energy vehicles, specifically a VCU control strategy that balances air conditioning cooling with reducing compressor vibration and noise during idling and low-speed operation in the cooling process of a new energy vehicle's air conditioning system. Figure 1 The control strategy of this invention is a VCU control method for an air conditioning refrigeration system in a new energy vehicle. To overcome the shortcomings of existing technologies and achieve the objective of improving driving comfort, the technical solution adopted by this invention is as follows:

[0029] like Figure 1 As shown, the VCU control method of the new energy vehicle air conditioning refrigeration system of the present invention is: during the vehicle driving process, the vehicle speed parameters and the in-vehicle temperature parameters are used to jointly control the air conditioning system refrigeration.

[0030] exist Figure 1 In the diagram, cooling signal input 1 indicates that the air conditioning system provides a cooling signal input; vehicle speed 2 indicates that the VCU determines the vehicle's driving speed; air conditioning evaporator surface temperature 3 is the surface temperature of the air conditioning evaporator determined by the VCU; compressor speed 4 is the compressor speed under specific vehicle speed and temperature conditions; and control signal output 5.

[0031] This invention relates to a VCU control strategy for the in-vehicle temperature regulation system of new energy vehicles. Figure 1 The air conditioning compressor control strategy is the design framework of the VCU control strategy of this invention. The overall idea of ​​this control strategy is to change the traditional vehicle model's reliance on the interior temperature as a single signal, and instead use the vehicle's speed and interior temperature during driving to jointly control the air conditioning system's cooling.

[0032] This VCU control strategy changes the traditional approach of using temperature as the sole input signal for the air conditioning system. Instead, it uses vehicle speed as the primary signal and passenger compartment temperature as an auxiliary signal. This approach balances in-vehicle temperature regulation while effectively reducing in-vehicle vibration and noise caused by the air conditioning compressor, thus improving in-vehicle comfort. It also enhances the NVH performance of new energy vehicles, providing customers with a quiet and comfortable in-vehicle space and increasing passenger satisfaction.

[0033] The VCU detects the surface temperature 3 of the air conditioner evaporator dish and then controls the compressor speed 4 to achieve the purpose of vibration reduction and noise reduction.

[0034] When a passenger turns on the passenger compartment cooling knob, the signal is transmitted to the VCU. The VCU control program first judges the vehicle speed signal 2, which has two operating conditions: the first condition is a vehicle speed ≥ 20 km / h; the second condition is a vehicle speed < 20 km / h up to 0. Under both conditions, the VCU detects the surface temperature 3 of the air conditioning evaporator and then controls the compressor speed 4 to achieve the purpose of vibration reduction and noise reduction.

[0035] Specifically:

[0036] 1. Under operating conditions with a vehicle speed ≥ 20km / h:

[0037] When the temperature is above 13℃, the compressor operates at a speed of 4500 rpm to ensure the cooling effect of the air conditioner.

[0038] When the interior temperature is between 7°C and 13°C, the compressor operates at a speed of 3000 rpm to ensure the cooling effect of the air conditioner.

[0039] When the interior temperature is below 7°C, the compressor operates at a speed of 1000 rpm to ensure that the pipes are not damaged by freezing.

[0040] 2. Under the condition of vehicle speed <20km / h, up to vehicle speed = 0:

[0041] When the interior temperature is above 7°C, the compressor operates at a speed of 3000 rpm, sacrificing some of the air conditioning cooling performance (cooling above 13°C) to reduce vibration and noise inside the vehicle and ensure the comfort of the passenger cabin.

[0042] When the interior temperature is below 7°C, the compressor operates at a speed of 1000 rpm to ensure that the pipes are not damaged by freezing.

[0043] Once the set vehicle speed 2 and the surface temperature 3 of the air conditioning evaporator are reached, a 10-second delay is set before the control program switches to execute the command, in order to avoid damage to the compressor itself caused by the frequent and rapid changes in compressor speed 4 when the vehicle speed 2 hovers around 20km / h.

[0044] The beneficial effects of adopting the above technical solution are:

[0045] 1. Effectively reduces vibration and noise inside the vehicle during air conditioning system cooling operation;

[0046] 2. Improves in-vehicle comfort and drivability, providing a quiet and comfortable driving and riding space for passengers; protects the air conditioning pipes from damage caused by over-cooling of the compressor;

[0047] 3. Effectively reduced the cost of redesigning and developing the compressor and rearranging the entire vehicle layout;

[0048] 4. This technology can be promoted and applied in the process of solving similar problems in other new energy projects.

[0049] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A VCU control method for the air conditioning refrigeration system of a new energy vehicle, wherein the air conditioning system refrigeration is controlled by the vehicle speed parameters and the in-vehicle temperature parameters during vehicle operation; Its features are: The VCU detects the surface temperature (3) of the air conditioner evaporator and then controls the compressor speed (4) to achieve the purpose of vibration reduction and noise reduction. When a passenger turns on the passenger compartment cooling knob, a signal is transmitted to the VCU. The VCU control program first judges the vehicle speed (2) signal. There are two working conditions for judging the vehicle speed (2): the first working condition is that the vehicle speed is ≥20km / h; the second working condition is that the vehicle speed is <20km / h until 0. Under both working conditions, the VCU detects the surface temperature (3) of the air conditioning evaporator and then controls the compressor speed (4) to achieve the purpose of vibration reduction and noise reduction. 1) Under operating conditions where the vehicle speed is ≥20km / h: When the temperature is above 13℃, the compressor operates at a speed of 4500 rpm to ensure the cooling effect of the air conditioner. When the interior temperature is between 7°C and 13°C, the compressor operates at a speed of 3000 rpm to ensure the cooling effect of the air conditioner. When the interior temperature is below 7°C, the compressor operates at a speed of 1000 rpm to ensure that the pipes are not damaged by freezing. 2) Under the condition of vehicle speed <20km / h, up to vehicle speed = 0: When the interior temperature is above 7°C, the compressor operates at a speed of 3000 rpm, sacrificing some of the air conditioning cooling performance to reduce vibration and noise inside the vehicle and ensure the comfort of the passenger compartment. When the interior temperature is below 7°C, the compressor operates at a speed of 1000 rpm to ensure that the pipes are not damaged by freezing. Once the set vehicle speed (2) and the surface temperature of the air conditioning evaporator (3) are reached, a 10-second delay is set before the control program switches to execute the command, so as to avoid damage to the compressor itself caused by the frequent and rapid changes in compressor speed (4) when the vehicle speed (2) hovers around 20km / h.

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