Efficient energy-saving air conditioning system capable of recycling braking force

Abstract

The invention discloses an efficient energy-saving air conditioning system for recovering braking force. The efficient energy-saving air conditioning system comprises an engine control module for controlling the rotating speed and torque of an engine; the air conditioning system control module is electrically connected with the engine control module and is used for controlling the comfort level of a passenger compartment; the external control variable displacement compressor is electrically connected with the air conditioning system control module and is used for providing a cold source for the air conditioning system; the cold accumulation type evaporator is mechanically connected with the external control variable displacement compressor; and the air conditioning box is electrically connected with the air conditioning system control module, the external control variable displacement compressor is reversely dragged to work by utilizing kinetic energy generated when the vehicle decelerates / brakes, meanwhile, the working displacement of the external control variable displacement compressor is increased, the kinetic energy generated when the vehicle decelerates / brakes is directly converted into air conditioning cold energy, and the cold energy is stored in the cold accumulation type evaporator.

Description

Technical Field

[0001] The invention belongs to the technical field, and in particular relates to a high-efficiency energy-saving air-conditioning system that recovers braking force. Background Art

[0002] With the improvement of living standards, cars have become a common means of transportation for many families. While enjoying the convenience brought by cars, people's requirements for car riding comfort are also increasing. At the same time, with the popularization of environmental awareness, people are paying more and more attention to vehicle exhaust emissions and fuel consumption as well as the energy efficiency of car air conditioners.

[0003] In the prior art, the vehicle directly converts kinetic energy into mechanical heat energy during braking, which is wasted. At the same time, the air-conditioning system needs to consume additional engine torque during cooling. At the same time, when the engine torque is insufficient during vehicle starting / acceleration, the air-conditioning cooling capacity will be affected, affecting the comfort of the passenger compartment and reducing the physical comfort of the driver and passengers. Summary of the invention

[0004] The object of the present invention is to provide a high-efficiency and energy-saving air conditioning system for recovering braking force to solve the above-mentioned problems.

[0005] To achieve the above object, the present invention provides the following technical solution: a high-efficiency energy-saving air conditioning system for recovering braking force, comprising: An engine control module, which performs real-time control of the vehicle braking system, engine torque, engine speed, etc.; An air conditioning system control module, which is electrically connected to the engine control module and is responsible for passenger compartment comfort control; An air conditioning box module, the air conditioning box module is electrically connected to the air conditioning system control module and is responsible for responding to instructions issued by the air conditioning control module; An externally controlled variable displacement compressor, which is electrically connected to the air conditioning system control module, is responsible for responding to instructions issued by the air conditioning control module and can change its working displacement by current / PWM signal / communication, etc.; A cold storage evaporator, the cold storage evaporator is connected to the air conditioning box module; The air conditioning system control module and the externally controlled variable displacement compressor perform data transmission via current / PWM signal / bus communication, and can control the switch of the externally controlled variable displacement compressor and / or the working displacement (speed / displacement) of the externally controlled variable displacement compressor; The vehicle sensor acquisition module, the air-conditioning system control module can calculate the cooling and cooling demand in the vehicle according to the internal and external parameters of the vehicle detected by the vehicle sensor acquisition module; calculate the displacement required by the externally controlled variable displacement compressor according to the cooling and cooling demand in the vehicle; calculate the torque required by the externally controlled variable displacement compressor according to the displacement of the externally controlled variable displacement compressor, the high and low pressures of the refrigerant, and the speed of the externally controlled variable displacement compressor; calculate the maximum torque of the externally controlled variable displacement compressor that can be consumed by the air-conditioning system through the high-pressure pressure value and the low-pressure pressure value of the refrigerant in the refrigeration system, the current cold storage capacity of the evaporator, the maximum cold storage capacity of the evaporator, and the frost protection temperature value of the evaporator; calculate the target change rate of the torque of the externally controlled variable displacement compressor through the current speed of the externally controlled variable displacement compressor, the high-pressure pressure value and the low-pressure pressure value of the refrigerant in the refrigeration system, and the air supply volume of the air-conditioning system.

[0006] Preferably, the vehicle sensor acquisition module includes a temperature collector for collecting temperature information inside / outside the vehicle; a humidity collector for collecting humidity information inside the vehicle; and a light collector for collecting light intensity information outside the vehicle.

[0007] Preferably, the air conditioning box module includes: an air conditioning box blower; an air conditioning box cold storage condenser; an externally controlled variable displacement compressor; and an air conditioning box temperature mixing damper.

[0008] Preferably, the parameter acquisition module and the air conditioning system control module perform data transmission via a serial communication bus.

[0009] Preferably, the air conditioning system control module is a control module integrated with the vehicle control panel, or a separate control module separated from the vehicle control panel.

[0010] Preferably, the air-conditioning system control module and the externally controlled variable displacement compressor module transmit data via current / PWM signal / bus communication, which can control the switch of the externally controlled variable displacement compressor and / or the working displacement (speed / displacement) of the externally controlled variable displacement compressor.

[0011] Preferably, the parameter acquisition module is a control module integrated with the vehicle body control module, or a control module integrated with the vehicle engine control module, or a separate control module.

[0012] Preferably, it also includes: a remote control instruction receiving module for receiving a remote control instruction input from a remote terminal to control the opening or closing of the air conditioning system control module.

[0013] Preferably, the cold storage evaporator uses fillers such as paraffin as a cold storage medium and uses its phase change latent heat to store cold.

[0014] The technical effects and advantages of the present invention are as follows: the kinetic energy of the vehicle deceleration / braking is used to reverse the operation of the externally controlled variable displacement compressor, and the working displacement of the externally controlled variable displacement compressor is increased, so that the kinetic energy of deceleration / braking is directly converted into air conditioning cooling capacity, and the cooling capacity is stored in the cold storage evaporator. When the vehicle is parked at a later stage, the engine is stopped; or when the vehicle is accelerated, the displacement of the externally controlled variable displacement compressor is reduced to provide the engine torque to the vehicle for acceleration, and the cold capacity pre-stored in the cold storage evaporator is used to maintain the comfort of the passenger compartment. While fully utilizing the energy of the entire vehicle, better human comfort is provided, and the efficient and energy-saving air conditioning system is realized to recycle the braking energy of the vehicle. DETAILED DESCRIPTION

[0015] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0016] The invention provides a high-efficiency energy-saving air conditioning system for recovering braking force.

[0017] Embodiment 1: Engine control module, the engine control module can collect and obtain the following parameters: vehicle speed, vehicle accelerator pedal signal, vehicle brake pedal signal, vehicle gear signal and other parameters, and calculate the current working condition of the vehicle from this signal, for example: vehicle downhill gliding; vehicle braking; vehicle low gear gliding; vehicle low speed starting; vehicle rapid acceleration and other working conditions.

[0018] The engine control module performs real-time control of the vehicle braking system, engine torque, engine speed, etc. For example: braking force distribution (engine drag braking torque and brake system braking torque distribution); engine torque control (drive system torque demand, external variable displacement compressor torque demand, auxiliary power system torque demand), etc.

[0019] The air conditioning system control module is electrically connected to the engine control module and is responsible for passenger compartment comfort control. It is responsible for collecting relevant sensor parameters and controlling the air conditioning box damper position, external variable displacement compressor start / stop / displacement, blower speed and other components to provide passenger compartment comfort. ; An air conditioning box module electrically connected to the air conditioning system control module and responding to instructions issued by the air conditioning control module; An externally controlled variable displacement compressor electrically connected to the air conditioning system control module and responsive to commands issued by the air conditioning control module; A cold storage evaporator connected to the air conditioning box module to provide thermal energy storage; The air-conditioning system control module can calculate the cooling and cooling demand in the vehicle based on the internal and external parameters of the vehicle detected by the vehicle sensor acquisition module; calculate the required displacement of the externally controlled variable displacement compressor based on the cooling and cooling demand in the vehicle; calculate the required torque of the externally controlled variable displacement compressor based on the displacement of the externally controlled variable displacement compressor, the high and low pressures of the refrigerant, and the speed of the externally controlled variable displacement compressor; calculate the maximum externally controlled variable displacement compressor torque that can be consumed by the air-conditioning system through the high-pressure and low-pressure values ​​of the refrigerant in the refrigeration system, the current cold storage capacity of the evaporator, the maximum cold storage capacity of the evaporator, and the frost protection temperature value of the evaporator; calculate the target change rate of the torque of the externally controlled variable displacement compressor through the current speed of the externally controlled variable displacement compressor, the high-pressure and low-pressure values ​​of the refrigerant in the refrigeration system, and the air supply volume of the air-conditioning system.

[0020] Notify the engine control module through the vehicle bus: the torque of the external variable displacement compressor currently required by the air conditioning system; the maximum torque of the external variable displacement compressor that can be consumed by the air conditioning system; the target change rate of the torque of the external variable displacement compressor and send the target torque change rate to the engine control module through the bus; at the same time, based on the external variable displacement compressor allowable torque and allowable torque change amount fed back by the engine control module (to prevent engine jitter caused by sudden or excessive engine torque, affecting emissions or even stalling), control the displacement of the external variable displacement compressor by changing the current / PWM signal / communication, etc. Increase the torque of the air conditioning external variable displacement compressor to share the engine torque load, and achieve vehicle deceleration / braking through reverse dragging of the transmission system, convert the braking kinetic energy of the vehicle into the cooling capacity of the air conditioning system, and store the cooling capacity in the cold storage evaporator (the cold storage evaporator uses fillers such as paraffin as a cold storage medium and uses its phase change latent heat to store cold capacity); The vehicle air conditioning system control module can calculate the air outlet temperature of the air conditioning system that meets the needs of passengers based on the internal and external parameters of the vehicle detected by the vehicle sensor acquisition module. The position of the temperature mixing damper is calculated based on the values ​​of the evaporator temperature sensor, the heating core temperature sensor, and the air outlet temperature sensor. By controlling the position of the temperature mixing damper, it is ensured that when the externally controlled variable displacement compressor is fully loaded for cooling and energy storage, the air outlet temperature remains unchanged and does not affect the passenger's perception of comfort.

[0021] When the vehicle brakes to convert the recovered kinetic energy into cold (heat) energy, the displacement of the externally controlled variable displacement compressor increases, the evaporator starting temperature decreases, the paraffin inside the evaporator solidifies, storing cold (heat), and the mixing damper is biased toward the warm air side to keep the outlet air temperature unchanged; When the vehicle starts at a low speed or accelerates suddenly, the engine control module sends a vehicle operating status signal to the vehicle air conditioning system control module through the bus; The vehicle air conditioning system control module calculates the target outlet air temperature based on the internal and external parameters of the vehicle detected by the vehicle sensor acquisition module; calculates the required power of the external control variable displacement compressor based on the current evaporator cold (heat) energy storage situation, and sends the torque target change rate to the engine control module through the bus based on the required target power of the external control variable displacement compressor and the torque change rate of the external control variable displacement compressor; at the same time, based on the external control variable displacement compressor allowable torque and allowable torque change amount fed back by the engine control module (to prevent engine jitter caused by sudden change or over-limit of engine torque, affecting emissions or even stalling), the external control variable displacement compressor is controlled to reduce the displacement or turn off the external control variable displacement compressor by changing the current / PWM signal / communication, etc.; and calculates the position of the temperature mixing damper based on the values ​​of the evaporator temperature sensor, the heating core temperature sensor, and the air outlet temperature sensor. By controlling the position of the temperature mixing damper, it is ensured that when the external control variable displacement compressor reduces the load or stops cooling, the evaporator cold (heat) energy storage is used to maintain the outlet air temperature unchanged without affecting the passenger comfort perception.

[0022] At the same time, the engine control module controls the engine system torque according to the actual torque of the externally controlled variable displacement compressor and the torque change rate of the externally controlled variable displacement compressor sent by the vehicle air conditioning system control module, distributes the torque to the drive system to increase the vehicle speed as quickly as possible, shorten the time the engine works in the low-efficiency range, improve the vehicle fuel economy, and achieve energy conservation and emission reduction goals; The parameter acquisition module includes: A temperature collector for collecting temperature information inside and outside the vehicle, a humidity collector for collecting humidity information inside the vehicle, and a light collector for collecting light intensity information outside the vehicle; The air conditioning box module includes: Air conditioning box blower, air conditioning box cold storage condenser, externally controlled variable displacement compressor, air conditioning box temperature mixing damper; The system includes an externally controlled variable displacement compressor: its working displacement can be changed by current / PWM signal / communication, etc. The parameter acquisition module and the air conditioning system control module transmit data via a serial communication bus; The air conditioning system control module is a control module integrated with the vehicle control panel, or a separate control module separated from the vehicle control panel; The air conditioning system control module and the external variable displacement compressor module transmit data through current / PWM signal / bus communication, which can control the switch of the external variable displacement compressor and / or the working displacement (speed / displacement) of the external variable displacement compressor; The parameter acquisition module is a control module integrated with the vehicle body control module, or a control module integrated with the vehicle engine control module, or a separate control module; It also includes: a remote control instruction receiving module for receiving a remote control instruction inputted from a remote terminal and controlling the opening or closing of the air conditioning system control module; Embodiment 2: If the vehicle is equipped with a start-stop function, when the engine control module identifies the vehicle braking or vehicle coasting conditions, it sends an energy storage command to the vehicle air conditioning system control module through the bus. The vehicle air conditioning system control module calculates whether the vehicle is in heating / cooling / dehumidification conditions and the target departure temperature based on the internal and external parameters of the vehicle detected by the vehicle sensor acquisition module; if the vehicle is in cooling / dehumidification conditions, the vehicle air conditioning system control module enters the braking cold (heat) energy storage mode: According to the current evaporator cold (heat) storage situation, the required external control variable displacement compressor power is calculated, and the torque target change rate is sent to the engine control module through the bus based on the required external control variable displacement compressor target power and the external control variable displacement compressor torque change rate; at the same time, based on the external control variable displacement compressor allowable torque and allowable torque change amount fed back by the engine control module (to prevent engine jitter caused by sudden change or over-limit of engine torque, affecting emissions or even stalling), the external control variable displacement compressor is controlled to reduce displacement or shut down the external control variable displacement compressor by changing current / PWM signal / communication, etc.; and according to the values ​​of the evaporator temperature sensor, the heating core temperature sensor, and the air outlet temperature sensor, the position of the temperature mixing damper is calculated, and by controlling the position of the temperature mixing damper, it is ensured that when the external control variable displacement compressor reduces load or stops cooling, the evaporator cold (heat) storage is used to maintain the outlet air temperature unchanged without affecting the passenger comfort perception.

[0023] After the vehicle is parked, the engine control module enters the start-stop mode and shuts down the engine. The vehicle air conditioning system control module calculates the position of the temperature mixing damper according to the values ​​of the evaporator temperature sensor, the heating core temperature sensor, and the air outlet temperature sensor. By controlling the position of the temperature mixing damper, the evaporator cold (heat) storage is used to maintain the outlet air temperature unchanged, while maintaining the outlet air dry (using the evaporator cold (heat) storage to condense and dehumidify the passing air), extending the engine shutdown time, so as to reduce vehicle fuel consumption, improve fuel economy, and achieve energy conservation and emission reduction; The air conditioning box blower is electrically connected to the air conditioning system control module and uses linear speed control or pulse width modulation control; The air conditioning condenser is an evaporator that is mechanically connected to the air conditioning box module and has a cold storage function (for example, a cold storage evaporator uses fillers such as paraffin as a cold storage medium and uses its phase change latent heat to store cold). When the external control variable displacement compressor is working, the paraffin will change from liquid to solid to store cold. When the external control variable displacement compressor is working to reduce emissions or stops working, the paraffin will change from solid to liquid, releasing cold and maintaining the evaporator outlet temperature unchanged.

[0024] In summary, the present invention can realize automatic identification of vehicle driving conditions and passenger compartment comfort conditions. When the vehicle is braking or long-distance downhill or low-gear gliding, the air-conditioning system control module actively increases the working displacement of the externally controlled variable displacement compressor, thereby increasing the engine load torque, using the engine load torque to bear part of the vehicle braking, and reducing the energy lost by the brake pad during braking. At the same time, by increasing the displacement of the externally controlled variable displacement compressor, additional air conditioning refrigeration capacity is generated, and the cold storage evaporator is used to store cold energy to realize the conversion and recovery of vehicle braking energy, and the outlet air temperature is kept unchanged by the offset of the temperature damper, without affecting the riding comfort of the driver and passengers. When the vehicle starts / accelerates again, the displacement of the externally controlled variable displacement compressor is reduced / stopped to reduce the torque load under the low-speed condition of the engine to further achieve the purpose of energy saving and emission reduction. The reduced refrigeration capacity is compensated by the cold storage evaporator, and the outlet air temperature is kept unchanged by the correction of the temperature damper, so as not to affect the comfort of the passenger compartment.

[0025] During the vehicle's deceleration phase, the air-conditioning system is used to store cold energy, converting the vehicle's kinetic energy into heat (cold) energy storage, thereby realizing vehicle braking energy recovery and reducing brake system wear without increasing parts and system costs.

[0026] During the vehicle startup and acceleration phases, the heat (cold) energy stored in the air-conditioning system is released, and the engine torque is fully provided to the vehicle driving, reducing the occurrence of low-speed and high-torque operating conditions of the engine, improving the overall fuel efficiency of the vehicle, while not affecting the comfort of the passenger compartment.

[0027] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-efficiency and energy-saving air conditioning system for recovering braking force, characterized in that: include: An engine control module, which performs real-time control of the vehicle braking system, engine torque, engine speed, etc.; An air conditioning system control module, which is electrically connected to the engine control module and is responsible for passenger compartment comfort control; An air conditioning box module, the air conditioning box module is electrically connected to the air conditioning system control module and is responsible for responding to instructions issued by the air conditioning control module; An externally controlled variable displacement compressor, which is electrically connected to the air conditioning system control module, is responsible for responding to instructions issued by the air conditioning control module and can change its working displacement by current / PWM signal / communication, etc.; A cold storage evaporator, the cold storage evaporator is connected to the air conditioning box module; The air conditioning system control module and the externally controlled variable displacement compressor perform data transmission via current / PWM signal / bus communication, and can control the switch of the externally controlled variable displacement compressor and / or the working displacement (speed / displacement) of the externally controlled variable displacement compressor; The vehicle sensor acquisition module, the air conditioning system control module can calculate the cooling demand in the vehicle according to the internal and external parameters of the vehicle detected by the vehicle sensor acquisition module; calculate the displacement required by the external control variable displacement compressor according to the cooling demand in the vehicle; calculate the torque required by the external control variable displacement compressor according to the displacement of the external control variable displacement compressor, the high and low pressures of the refrigerant, and the speed of the external control variable displacement compressor; calculate the maximum torque of the external control variable displacement compressor that can be consumed by the air conditioning system through the high pressure value and low pressure value of the refrigerant in the refrigeration system, the current cold storage capacity of the evaporator, the maximum cold storage capacity of the evaporator, and the frost protection temperature value of the evaporator; The target change rate of the torque of the externally controlled variable displacement compressor is calculated through the current speed of the externally controlled variable displacement compressor, the high pressure value and the low pressure value of the refrigerant in the refrigeration system, and the air supply volume of the air conditioning system.

2. The high-efficiency energy-saving air conditioning system for recovering braking force according to claim 1, characterized in that: The vehicle sensor acquisition module includes a temperature collector for collecting temperature information inside and outside the vehicle; a humidity collector for collecting humidity information inside the vehicle; and a light collector for collecting light intensity information outside the vehicle.

3. The high-efficiency energy-saving air conditioning system for recovering braking force according to claim 1, characterized in that: The air conditioning box module comprises: an air conditioning box blower; an air conditioning box cold storage condenser; an externally controlled variable displacement compressor; and an air conditioning box temperature mixing damper.

4. The high-efficiency energy-saving air conditioning system for recovering braking force according to claim 1, characterized in that: The parameter acquisition module and the air conditioning system control module perform data transmission via a serial communication bus.

5. The high-efficiency and energy-saving air conditioning system for recovering braking force according to claim 1, characterized in that: The air conditioning system control module is a control module integrated with the vehicle control panel, or a separate control module separated from the vehicle control panel.

6. The high-efficiency energy-saving air conditioning system for recovering braking force according to claim 1, characterized in that: The air conditioning system control module and the externally controlled variable displacement compressor module transmit data via current / PWM signal / bus communication, and can control the switch of the externally controlled variable displacement compressor and / or the working displacement (speed / displacement) of the externally controlled variable displacement compressor.

7. The high-efficiency and energy-saving air conditioning system for recovering braking force according to claim 1, characterized in that: The parameter acquisition module is a control module integrated with the vehicle body control module, or a control module integrated with the vehicle engine control module, or a separate control module.

8. The high-efficiency and energy-saving air conditioning system for recovering braking force according to claim 1, characterized in that: Also includes: A remote control command receiving module receives a remote control command inputted from a remote terminal and controls the opening or closing of the air conditioning system control module.

9. The high-efficiency energy-saving air conditioning system for recovering braking force according to claim 1, characterized in that: The cold storage evaporator uses fillers such as paraffin as a cold storage medium and uses its phase change latent heat to store cold.