Freezing-blocking-free pneumatic braking system of electric commercial vehicle

Abstract

The utility model provides an electric commercial vehicle freezing-blocking-free pneumatic braking system which comprises an air compression pump, a heat dissipation spiral, a condenser, a dryer, an air storage cylinder and braking air using equipment of the air storage cylinder, and a water way temperature returning part and an electric control unit of the water way temperature returning part are additionally arranged in the system. The water path temperature return part is a bypass water path which is communicated with the water tank communicating pipeline of the motor cooling pipe in parallel; the water path is provided with a heat exchange solenoid, a water pump and an electric control valve; and the heat exchange solenoid is wound and clung to the outer surface of the air passage metal pipeline between the condenser and the dryer. According to the technical scheme, it is guaranteed that an air channel pipeline of the pneumatic braking system can still keep smooth and reliable braking operation under the cold winter condition.

Description

Technical Field

[0001] This patent application relates to pneumatic braking systems for commercial electric vehicles, and more particularly to a pneumatic braking control system for commercial electric vehicles that addresses the impact of low temperatures on braking safety. Background Technology

[0002] Pneumatic braking systems are widely used in electric commercial vehicles due to their advantages such as large braking torque, low leakage, low requirements for sealing components, and smooth braking. Figure 1 The diagram shows the basic components of a pneumatic braking system, including an air compressor pump 1, a cooling spiral 2, a condenser 3, a dryer 5, and an air reservoir 7 connected in series to store brake fluid for backup. In this system, air is pressurized by the compressor pump 1. As the high-pressure gas flows through the cooling spiral and condenser, moisture is released. The dryer further removes moisture to prevent moisture in the compressed gas from affecting braking performance, minimizing potential safety hazards, and preventing corrosion of the components. However, in practical applications, due to the components and complex environments, moisture in the introduced air is difficult to completely remove and can accumulate in the metal air passages. Especially when the ambient temperature drops below zero, moisture deposition and freezing can unknowingly block the air passages, leading to insufficient air storage in the air reservoir and even causing serious safety hazards such as brake failure. To avoid this situation, drivers need to be perceptive and experienced in noticing a decrease in air pressure with no sign of recovery, to diagnose the fault, get out of the vehicle to check, and remove ice to eliminate the problem. This places high demands on the driver's experience and maintenance skills, and also increases the driver's workload. Summary of the Invention

[0003] The purpose of this patent application is to solve the safety hazard of air passage blockage caused by the pneumatic braking system of electric commercial vehicles in low-temperature environments, which leads to insufficient braking capacity or even failure, and to provide a pneumatic braking system for electric commercial vehicles that is free from freezing.

[0004] The technical solution for the freeze-block-free pneumatic braking system for electric commercial vehicles provided in this patent application has the following main technical contents:

[0005] A non-freezing pneumatic braking system for electric commercial vehicles. The system comprises an air compressor pump, a cooling spiral, a condenser, a dryer, an air storage tank, and a braking air device. The air passages of the above components are connected in sequence.

[0006] This system is equipped with a water circuit reheating section and its electrical control unit.

[0007] The water circuit return section is a side water circuit connected in parallel to the water tank connecting pipe of the motor cooling pipe. The water circuit is connected to a heat exchange solenoid, a water pump and an electric control valve; the water pump and the electric control valve are respectively electrically connected to an execution bus terminal of the electric control unit.

[0008] The aforementioned electrically controlled valve is a normally closed solenoid valve;

[0009] The heat exchange spiral tube is at least wound around and closely attached to the outer surface of the gas duct metal pipeline between the condenser and the dryer.

[0010] In one preferred embodiment of the above overall technical solution, the heat exchange spiral tube is also wound around and closely attached between the dryer and the gas storage cylinder, and close to the outer surface of the metal pipeline of the dryer's air passage.

[0011] In one preferred embodiment of the above overall technical solution, a pipeline temperature sensor and a gas flow sensor are installed on the gas duct metal pipeline, and the pipeline temperature sensor and the gas flow sensor are electrically connected to the air temperature detection and gas flow detection transmitter bus of the electronic control unit, respectively.

[0012] In one preferred embodiment of the above overall technical solution, a flow sensor is installed in the water circuit reheat section, and the flow sensor is electrically connected to the reheat flow detection and transmission bus of the electronic control unit.

[0013] In one preferred embodiment of the above overall technical solution, a medium liquid temperature sensor is installed in the water circuit return section, and the medium liquid temperature sensor is electrically connected to the medium liquid temperature detection and transmission bus of the electronic control unit.

[0014] In one preferred embodiment of the above overall technical solution, the heat exchange solenoid has its rear end, which is near the gas storage tank, and its front end, which is near the condenser, connected in parallel with the lead-out pipeline and return water pipeline of the motor cooling pipe, respectively.

[0015] In one preferred embodiment of the above overall technical solution, the electrically controlled valve and the water pump are respectively installed on the water connection pipelines at both ends of the heat exchange spiral tube.

[0016] In one preferred embodiment of the above overall technical solution, the heat exchange spiral tube is a rubber tube.

[0017] This patent application provides a freeze-proof pneumatic braking system solution for electric commercial vehicles. It utilizes only the warm water cooled by the motor as a return heat source to prevent freezing of the pneumatic braking system's air passages, ensuring unobstructed and reliable braking operation even in cold winter conditions, without requiring an additional heat source. The overall solution also achieves intelligent, automatic anti-freeze operation control of the pneumatic braking system, significantly reducing manual intervention and greatly improving braking reliability and safety. Simultaneously, it avoids the energy consumption and battery life loss associated with adding an additional heat source, as well as the substantial waste of motor cooling energy. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the pneumatic braking system of an existing commercial electric vehicle.

[0019] Figure 2 This is a structural diagram of the system composition of this patent application. Detailed Implementation

[0020] To aid in a deeper understanding of this technical solution, the following detailed description of the freeze-block-free pneumatic braking system for electric commercial vehicles will be provided in conjunction with specific embodiments. The scope of protection of this patent application is not limited to the illustrated embodiments, but also includes other equivalent embodiments within the scope of the claims.

[0021] This electric commercial vehicle does not have a frozen pneumatic braking system, such as Figure 2 As shown, the system consists of an air compressor pump 1, a condenser 3, a dryer 5, an air reservoir 7, and a braking air device 8. The air compressor pump 1 is connected to the air passage of the condenser 3 via a heat dissipation spiral 2. The dryer 5 is installed on the metal pipeline 4 of the air passage connecting the condenser 3 and the air reservoir 7. The condenser 3 and the dryer 5 are used to effectively remove most of the moisture in the compressed air. The air reservoir 7 serves as a clean power air storage component for the braking air device 8.

[0022] This pneumatic braking system is also equipped with a water circuit reheating section and its electronic control unit.

[0023] The water circuit reheating section is mainly a side water circuit that is connected in parallel to the pipeline connecting the motor cooling pipe 13 and its water tank 16. The water circuit is connected to a heat exchange spiral tube 6 and also has a water pump 20 and an electric control valve 12 installed. The water pump 20 and the electric control valve 12 are respectively electrically connected to an execution bus of the electric control unit 11.

[0024] The solenoid valve 12 is a normally closed solenoid valve.

[0025] The heat exchange spiral tube 6, preferably a rubber tube, is at least spirally wound and as close as possible to the outer surface of the gas passage metal pipeline 4 between the condenser 3 and the dryer 5. It can also be extended and spirally wound between the dryer 5 and the gas storage tank 7, close to the outer surface of the gas passage metal pipeline 4 of the dryer 5. The heat exchange medium liquid cooled by the motor is used to heat up and keep the gas passage metal pipeline 4 warm.

[0026] The water pump 20 is preferably installed on the water line connecting the heat exchanger spiral tube 6 away from the dryer 5, forcing the motor cooling medium liquid to circulate through the heat exchanger spiral tube 6 from the rear end of the gas passage metal pipeline 4, that is, the end close to the gas storage tank 7, to the front end, that is, the end close to the condenser 3; the water pump 20 is preferably installed at a height lower than the water tank connecting pipeline of the motor cooling pipe 13.

[0027] The electrically controlled valve 12 and the water pump 20 are respectively installed on the water lines connecting both ends of the heat exchange spiral tube 6.

[0028] In this embodiment, a pipeline temperature sensor 17 and an air flow sensor 18 are installed on the gas duct metal pipeline 4. The pipeline temperature sensor 17 and the air flow sensor 18 are electrically connected to the pipeline temperature detection and air flow detection transmission bus of the electronic control unit 11, respectively. The electronic control unit 11 is also electrically connected to an air temperature sensor 10 that monitors the atmospheric temperature through the atmospheric temperature detection transmission bus.

[0029] When the electronic control unit 11 detects the temperature of the metal pipeline through the pipeline temperature sensor 17, and the pipeline temperature is below zero degrees, and the air flow sensor 18 detects that the air flow of the air passage metal pipeline 4 is continuously weakening until it is lower than the set value, the electronic control unit 11 sends an opening command to the electronic control valve 12 and the water pump 20 through the execution bus to open the bypass water circuit, force some of the motor cooling medium liquid to be introduced into the bypass water circuit, and heat exchange solenoid 6 heats and keeps the air passage metal pipeline 4 warm, ensuring the smooth flow and normal operation of the brake air circuit.

[0030] The heat exchange spiral tube 6 has its rear end, which is close to the gas storage tank 7, and its front end, which is close to the condenser 3, connected in parallel to the lead-out pipeline 15 and the return water pipeline 14 of the motor cooling pipe 13, respectively. The relatively high-temperature cooling medium liquid is used to enhance the heat insulation of the gas passage metal line 4 far away from the condenser 3.

[0031] To prevent water pump 20 from being damaged or even burned out due to water shortage in the bypass water circuit, the water circuit return section is equipped with a flow sensor 19 for detecting the return flow rate and a medium liquid temperature sensor 21 for monitoring the temperature of the heat exchange medium liquid. The flow sensor 19 and the medium liquid temperature sensor 21 are electrically connected to the medium flow detection and transmission bus and the medium temperature detection and transmission bus of the electronic control unit 11.

[0032] When the electronic control unit ECU 11 detects that the pipeline temperature value is higher than the set lower temperature limit via the pipeline temperature sensor 17, and the air flow sensor 18 detects that the weakening trend of air flow has been curbed and the set normal flow limit has been reached, it indicates that the ice blockage in the brake air passage has begun to dissipate. When the airflow is completely unobstructed, a command to close the electronic control valve 12 is issued, and the flow sensor 19 continues to be monitored until the flow detection value is 0, at which point the water pump 20 is shut off. This control step slightly delays the execution time of shutting off the water pump 20 after the electronic control valve 12. The main purpose is to drain the medium liquid in the return water circuit to avoid residue and freezing blockage, which would make it difficult to start the next heat preservation cycle.

Claims

1. A non-freezing pneumatic braking system for electric commercial vehicles, the system comprising an air compressor pump (1), a cooling spiral (2), a condenser (3), a dryer (5), and an air storage tank (7) and its braking air equipment, wherein the air passages of the above components are connected in sequence; Its features are, This system is equipped with a water circuit reheating section and its electrical control unit. The water circuit return section is a side water circuit connected in parallel to the water tank connecting pipe of the motor cooling pipe (13). The water circuit is connected to a heat exchange spiral tube (6), a water pump (20) and an electric control valve (12). The water pump (20) and the electric control valve (12) are respectively electrically connected to an execution bus terminal of the electric control unit (11). The solenoid valve (12) is a normally closed solenoid valve; The heat exchange spiral tube (6) is at least wound around and closely attached to the outer surface of the gas passage metal pipeline (4) between the condenser (3) and the dryer (5).

2. The anti-freezing pneumatic braking system for electric commercial vehicles according to claim 1, characterized in that, The heat exchange spiral tube (6) is also wound around and closely attached to the outer surface of the air passage metal pipeline between the dryer (5) and the air storage cylinder (7) and close to the dryer (5).

3. The anti-freezing pneumatic braking system for electric commercial vehicles according to claim 1 or 2, characterized in that, A pipeline temperature sensor (17) and a gas flow sensor (18) are installed on the gas duct metal pipeline (4). The pipeline temperature sensor (17) and the gas flow sensor (18) are electrically connected to the air temperature detection and gas flow detection transmission bus of the electronic control unit (11), respectively.

4. The anti-freezing pneumatic braking system for electric commercial vehicles according to claim 1, characterized in that, A flow sensor (19) is installed in the water circuit reheat section. The flow sensor (19) is electrically connected to the reheat flow detection and transmission bus of the electronic control unit (11).

5. The anti-freezing pneumatic braking system for electric commercial vehicles according to claim 1, characterized in that, The water circuit return section is equipped with a medium liquid temperature sensor (21), which is electrically connected to the medium liquid temperature detection and transmission bus of the electronic control unit (11).

6. The anti-freezing pneumatic braking system for electric commercial vehicles according to claim 1, characterized in that, The heat exchange spiral tube (6) has its rear end, which is close to the gas storage tank (7), and its front end, which is close to the condenser (3), connected in parallel to the lead-out pipeline (15) and return water pipeline (14) of the motor cooling pipe (13), respectively.

7. The anti-freezing pneumatic braking system for electric commercial vehicles according to claim 1, characterized in that, The electrically controlled valve (12) and the water pump (20) are respectively installed on the connecting water lines at both ends of the heat exchange spiral tube (6).

8. The anti-freezing pneumatic braking system for electric commercial vehicles according to claim 1 or 6, characterized in that, The heat exchange spiral tube (6) is a rubber tube.

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