Vehicle and air brake system thereof
Technical Field
The invention relates to the field of vehicles, in particular to a vehicle and a pneumatic braking system thereof.
Background
With the increasing emphasis on environmental problems, new energy vehicles are continuously developed, and the application of air brake systems to new energy vehicles is becoming more common. New energy vehicles employing air brake systems typically employ electric air compressors to provide an air source. However, most vehicles with electric air compressors are not provided with a back pressure unloading system. If the back pressure unloading system is not arranged, when a driver temporarily stops or returns home, the vehicle is flameout, the electric air compressor suddenly stops running, the air pressure of the whole vehicle does not reach the unloading pressure, and the dryer does not unload; at this time, there is high-pressure gas in the pipeline between the desicator and the electric air compressor, when the driver starts the vehicle again, and the ignition key is hit to the ON shelves, the electric air compressor starts again, and the electric air compressor is the load start this moment, probably causes the electric air compressor unable normal start even cause burn the machine phenomenon to unable normal air feed to the braking gas circuit, make the vehicle unable start or braking performance weaken, seriously influence driving safety and electric air compressor life.
In addition, a few new energy vehicles adopt a back pressure unloading system at present, but a deflation valve of the back pressure unloading system is controlled to be opened by an independent control module or a control program, a certain time delay exists, the control mode is very complex, and the design and purchase cost of the vehicles are greatly increased.
Disclosure of Invention
In order to solve the problems, the invention provides the air brake system of the vehicle, which can effectively avoid the on-load starting of the electric air compressor and has a simple structure and easy realization.
The invention further provides a vehicle, which comprises the air brake system of the vehicle.
The present invention provides a pneumatic brake system for a vehicle, comprising:
The air compressor is used for generating compressed gas;
The air inlet of the dryer is communicated with the air outlet of the air compressor through a pipeline;
The air inlet of the four-loop protection valve is communicated with the air outlet of the dryer;
the four loop air cylinders are respectively communicated with four air outlets of the four loop protection valves;
the electromagnetic valve comprises an air outlet, an air outlet and an air inlet, the air outlet of the electromagnetic valve is communicated with a pipeline between the dryer and the air compressor, the air inlet of the electromagnetic valve is blocked, and a coil of the electromagnetic valve is connected with an ignition switch of the vehicle;
When the ignition switch is started, a coil of the electromagnetic valve is electrified, an air outlet of the electromagnetic valve is communicated with an air inlet, the air outlet is closed, and compressed gas generated by the air compressor is directly led to the dryer; when the ignition switch is turned off, the electromagnetic valve is powered off, the air outlet and the air outlet of the electromagnetic valve are communicated, the air outlet is opened, and high-pressure gas in a pipeline between the dryer and the air compressor is discharged from the air outlet.
Further, the electromagnetic valve is a two-position three-way electromagnetic valve.
Further, the air compressor is an electric air compressor, and the air compressor comprises a motor and an air compressor body driven by the motor.
Further, the dryer is provided with a control port and an unloading valve, a pressure switch is arranged at the control port and is electrically connected with the dryer, when the system pressure reaches the unloading pressure of the test dryer, the unloading valve of the dryer is opened, the pressure of the control port rises, the pressure switch is turned on, the motor is controlled to stop running, and high-pressure gas in a pipeline between the dryer and the air compressor is discharged from an exhaust port of the dryer.
Further, a three-way joint is connected to a pipeline at the air outlet of the air compressor, an inlet of the three-way joint is communicated with the air outlet of the air compressor, and two outlets of the three-way joint are respectively connected with the air outlet of the electromagnetic valve and the air inlet of the dryer.
Further, the air braking system further comprises a regeneration air receiver which is communicated with a regeneration air inlet of the dryer through a pipeline, when the system pressure reaches the unloading pressure of the dryer, the air in the regeneration air receiver carries out back blowing on the drying agent of the dryer, and the moisture and the greasy dirt accumulated on the drying agent are discharged from an air outlet of the dryer, so that the drying agent regeneration is realized.
Further, the pneumatic braking system further comprises a braking control valve and a braking air chamber, wherein the braking control valve is connected with a braking pedal of the vehicle, and the braking air chamber is communicated with a corresponding loop air storage cylinder under the control of the braking control valve.
The invention further provides a vehicle, which comprises a cab, travelling wheels and the air brake system of the vehicle.
Further, the vehicle is a new energy vehicle.
The technical scheme provided by the embodiment of the invention can comprise the following beneficial effects:
The air brake system of the vehicle comprises an air compressor, a dryer, four loop protection valves, four loop air cylinders and an electromagnetic valve. The air compressor is used for producing compressed gas, and the air inlet of desicator passes through the gas outlet intercommunication of pipeline and air compressor machine, and four return circuit protection valve's air inlet and the gas outlet intercommunication of desicator, four return circuit gas receiver respectively with four gas outlet intercommunication of four return circuit protection valve, the solenoid valve includes gas outlet, gas vent and air inlet, the pipeline between the gas outlet intercommunication desicator of solenoid valve and the air compressor machine, and the air inlet of solenoid valve is plugged, and the coil of solenoid valve links to each other with the ignition switch of vehicle. When the ignition switch is started, the coil of the electromagnetic valve is electrified, the air outlet of the electromagnetic valve is communicated with the air inlet, the air outlet is closed, and compressed gas generated by the air compressor is directly led to the dryer; when the ignition switch is turned off (i.e., when the vehicle is turned off), the solenoid valve is de-energized, the air outlet and the air outlet of the solenoid valve communicate, and the air outlet is opened, and high-pressure air in the pipe between the dryer and the air compressor is discharged from the air outlet. Because the electromagnetic valve is arranged on the pipeline between the dryer and the air compressor and the coil of the electromagnetic valve is connected with the ignition switch of the vehicle, when the ignition switch is closed, the electromagnetic valve is powered off, the air outlet and the air outlet of the electromagnetic valve are communicated, the air outlet is opened, and high-pressure gas in the pipeline between the dryer and the air compressor is discharged from the air outlet. Therefore, the loading start of the air compressor can be effectively avoided, the burning of the air compressor is avoided, the service life of the air compressor is effectively prolonged, the running safety of a vehicle is ensured, and the unloading mode is simple and easy to realize.
The vehicle can effectively avoid the load starting of the air compressor due to the adoption of the air brake system of the vehicle, avoid the burning of the air compressor, effectively prolong the service life of the air compressor and ensure the running safety of the vehicle.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic structural view of an air compressor unloading device of an air brake system of a vehicle according to the present invention.
Detailed Description
For the purpose of further illustrating the principles and structure of the present invention, preferred embodiments of the invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the air compressor unloading device of the air brake system of the vehicle according to the present invention is schematically configured. The pneumatic brake system of the vehicle of the present invention includes an air compressor unloading device 10, and the air compressor unloading device 10 includes an air compressor 11, a dryer 12, a four-circuit protection valve 13, four-circuit air cylinders 141, 142, 143, 144, and an electromagnetic valve 15. The air compressor 11 is used for generating compressed air, and the air outlet 111 thereof is communicated with the air inlet 121 of the dryer 12 through a pipeline 18. The air inlet 135 of the four-circuit protection valve 13 is communicated with the air outlet 122 of the dryer 12 through a pipeline. The four air outlets 131, 132, 133, 134 of the four-circuit protection valve 13 are respectively communicated with four circuit air cylinders 141, 142, 143, 144. The solenoid valve 15 is provided on a line 18 between the dryer 12 and the air compressor 15.
The solenoid valve 15 includes an air outlet 153, an air outlet 152, and an air inlet 151, the air outlet 153 communicates with the pipe 18 between the dryer 12 and the air compressor 11, the air inlet 151 is closed with a plug, and an electric wire of the solenoid valve 15 is connected to an ignition switch of the vehicle, so that a coil of the solenoid valve 15 can be connected to the ignition switch of the vehicle. When the ignition switch is started, the coil of the electromagnetic valve 15 is electrified, the air outlet 153 of the electromagnetic valve 15 is communicated with the air inlet 151, the air outlet 152 is closed, the air compressor 11 is started, compressed gas generated by the air compressor 11 is directly led to the dryer 12, and the compressed gas after being dried by the dryer 12 enters the loop air cylinders 141, 142, 143 and 144 to provide an air source for a braking air path of a vehicle; when the vehicle is turned off, the electromagnetic valve 15 is turned off, the air outlet 152 is communicated with the air outlet 153, the air outlet 152 is opened, and high-pressure air in the pipeline 18 between the dryer 12 and the air compressor 11 is discharged from the air outlet 152. When the vehicle starts again, the air compressor 11 is in a no-load state, so that the normal starting of the air compressor 11 is effectively ensured, the driving safety is ensured, and the service life of the air compressor 11 is prolonged.
Solenoid valve 15 may be a two-position three-way solenoid valve.
A three-way joint (not shown) is connected to the pipeline 18 connected to the air outlet 111 of the air compressor 11, the inlet of the three-way joint is communicated with the air outlet 111 of the air compressor 11, and two outlets of the three-way joint are respectively connected with the air outlet 153 of the electromagnetic valve 15 and the air inlet 121 of the dryer 12.
The air compressor 11 can be an electric air compressor, the air compressor 11 comprises a motor and an air compressor main body driven by the motor, the motor rotates to drive the air compressor main body to work, and the air compressor main body converts the rotary mechanical energy of the motor into the pressure energy of gas so as to compress and boost the gas.
The dryer 12 is further provided with a control port 123 and an unloading valve (the unloading valve is integrated therein, not shown), and a pressure switch 16 is provided at the control port 123 for detecting the gas pressure at the control port 123 of the dryer 12. The pressure switch 16 is electrically connected with the air compressor 11, when the system pressure reaches the unloading pressure of the dryer 12, the unloading valve is opened, the pressure of the control port 123 rises, the pressure switch 16 is switched on, a signal is fed back to the motor of the air compressor 11, and the motor is controlled to stop running, so that the air compressor 11 stops working, and energy is saved. Meanwhile, high-pressure gas on a pipeline 18 between the air compressor 11 and the dryer 12 is discharged from an exhaust port of the dryer 12, so that no-load starting of the air compressor 11 during running of a vehicle is ensured, and the service life of the air compressor 11 is prolonged.
The air compressor unloading device 10 further includes a regenerating air receiver 17, wherein the regenerating air receiver 17 is communicated with a regenerating air inlet 124 of the dryer 12 through a pipeline, and the air in the regenerating air receiver 17 discharges the moisture, the greasy dirt and the like accumulated in the drying agent from an air outlet of the dryer 12 through the regenerating air inlet 124, thereby realizing the drying agent regeneration.
The four circuit air cylinders 141, 142, 143, 144 may correspond to an auxiliary air cylinder, a rear axle brake air cylinder, a front axle brake air cylinder, and a parking air cylinder of the air brake system, respectively.
The pneumatic brake system also comprises a brake control valve and a brake air chamber, wherein the brake control valve is connected with a brake pedal of the vehicle, and the brake air chamber is communicated with a corresponding loop air storage cylinder (for example, the brake air chamber of a front wheel is communicated with a front axle brake air storage cylinder and the brake air chamber of a rear wheel is communicated with a rear axle brake air storage cylinder) through the brake control valve. When the brake pedal is depressed, the brake control valve is opened, compressed gas in the loop air reservoir enters the brake air chamber to push the diaphragm of the brake air chamber to move, so that the wheel brakes are controlled to realize braking.
In summary, since the electromagnetic valve is arranged on the pipeline between the dryer and the air compressor and the coil of the electromagnetic valve is connected with the ignition switch of the vehicle, when the ignition switch is closed, the electromagnetic valve is powered off, the air outlet and the air outlet of the electromagnetic valve are communicated, the air outlet is opened, and high-pressure gas in the pipeline between the dryer and the air compressor is discharged from the air outlet. Therefore, the load starting of the air compressor can be effectively avoided, the burning of the air compressor is avoided, the service life of the air compressor is effectively prolonged, and the running safety of a vehicle is ensured.
The invention further provides a vehicle which comprises a cab, road wheels and the air brake system of the vehicle. Preferably, the vehicle may be a new energy vehicle. The new energy vehicle may be a vehicle that is supplied with energy from a fuel cell.
The foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by applying the descriptions and the drawings of the present invention are included in the scope of the present invention.