CN111907502A - Tractor air brake hill start auxiliary system - Google Patents
Tractor air brake hill start auxiliary system Download PDFInfo
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- CN111907502A CN111907502A CN202010652898.6A CN202010652898A CN111907502A CN 111907502 A CN111907502 A CN 111907502A CN 202010652898 A CN202010652898 A CN 202010652898A CN 111907502 A CN111907502 A CN 111907502A
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- air
- valve
- brake
- braking
- trailer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/683—Electrical control in fluid-pressure brake systems by electrically-controlled valves in pneumatic systems or parts thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
- B60T15/02—Application and release valves
- B60T15/04—Driver's valves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
- B60T15/02—Application and release valves
- B60T15/18—Triple or other relay valves which allow step-wise application or release and which are actuated by brake-pipe pressure variation to connect brake cylinders or equivalent to compressed air or vacuum source or atmosphere
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
- B60T15/02—Application and release valves
- B60T15/18—Triple or other relay valves which allow step-wise application or release and which are actuated by brake-pipe pressure variation to connect brake cylinders or equivalent to compressed air or vacuum source or atmosphere
- B60T15/181—Trailer control valves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
- B60T15/02—Application and release valves
- B60T15/18—Triple or other relay valves which allow step-wise application or release and which are actuated by brake-pipe pressure variation to connect brake cylinders or equivalent to compressed air or vacuum source or atmosphere
- B60T15/182—Trailer brake valves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/06—Applications or arrangements of reservoirs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/176—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS
Abstract
The invention discloses a tractor air brake hill start auxiliary system, which relates to the field of control of automobile air pressure valves and comprises a two-way check valve, a brake foot valve, an air reservoir and a relay valve, wherein the relay valve is used for controlling air flow to flow into a brake air chamber to realize wheel end braking, and comprises a front shaft relay valve, a drive shaft relay valve and a trailer brake control valve; the two-way one-way valve consists of 2 air inlets and 1 air outlet, and comprises a front axle braking two-way one-way valve, a driving axle braking two-way one-way valve and a trailer braking two-way one-way valve; and the air inlet of the brake foot valve is connected with the air reservoir. The invention can effectively avoid the vehicle from sliding on the slope.
Description
Technical Field
The invention relates to the field of control over automobile air pressure valves, in particular to a tractor air brake hill start auxiliary system.
Background
For the hill start assist function of the automobile, the hill start assist function is generally realized by using an Electronic Brake System (EBS) for better driving experience. However, because EBS is relatively expensive, in practical applications, most vehicles use an ABS (Antilock Brake System) System to implement a hill start assist function.
Referring to fig. 1, for a specific implementation flow of an existing hill start assist function, in a driving process of a vehicle on a hill, a driver steps on a brake pedal until the vehicle is stationary, keeps the brake pedal stationary (at this time, a wheel side brakes continuously, that is, a brake air pressure is not changed), then presses down a hill start assist switch (a request for starting the hill start assist function), and under an effect of a hill start assist controller, when the driver releases the brake pedal and steps on the accelerator pedal to start, braking at a non-driving wheel end is released, but the driving wheel end still keeps a wheel end braking state under an action of an ASR (Acceleration Slip Regulation) and an ABS solenoid valve, and as a depth of the accelerator pedal increases, end braking pressure of a driving wheel is reduced in a delayed manner until braking is completely released, so that smooth hill start of the vehicle is ensured.
The hill start assisting function shown in fig. 1 is mainly applied to a general truck, but is directly applied to a tractor in the practical application process, and the empty load and the full load of the whole vehicle are greatly changed due to the fact that the tractor needs to be connected with a trailer. When the tractor is connected with the trailer and is in a full load state, when the driver starts the hill start assisting function and releases the brake pedal, the braking force of the front axle and the trailer wheel end of the tractor is eliminated, only the driving axle of the tractor keeps the braking force under the condition of the early brake pedal, the braking force of the whole vehicle is reduced by 80% compared with the braking force when the driver steps on the brake pedal (taking a 4 multiplied by 2 tractor matched with a three-axle trailer as an example), and if the pre-stepping depth of the brake pedal before the request of the hill start assisting function is shallow, the risk that the vehicle slips down the slope due to insufficient braking force in the hill start process is easy to occur.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a tractor air braking hill start auxiliary system which can effectively avoid the risk of vehicle slipping on a slope.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
the relay valve is used for controlling air flow to flow into the brake air chamber to realize wheel end braking and comprises a front shaft relay valve, a driving shaft relay valve and a trailer braking control valve;
the two-way check valve consists of 2 air inlets and 1 air outlet, and comprises a front axle braking two-way check valve, a driving axle braking two-way check valve and a trailer braking two-way check valve;
the air inlet of the brake foot valve is connected with the air storage cylinder;
wherein, an air inlet of the front axle braking two-way one-way valve is connected with an air outlet of the lower cavity of the braking foot valve, an air inlet of the driving axle braking two-way one-way valve and an air inlet of the trailer braking two-way one-way valve are both connected with an air outlet of the upper cavity of the braking foot valve, the other air inlet of the front axle braking two-way one-way valve and the other air inlet of the trailer braking two-way one-way valve are both connected with an air outlet of an ABS electromagnetic valve arranged behind the driving axle relay valve, the other air inlet of the driving axle braking two-way one-way valve is connected, and an ASR electromagnetic valve is arranged between the air inlet and the air storage cylinder, the switch of the ASR electromagnetic valve is controlled by a controller, the air outlet of the front-axle braking two-way one-way valve is connected with the front-axle relay valve, the air outlet of the driving-axle braking two-way one-way valve is connected with the driving-axle relay valve, and the air outlet of the trailer braking two-way one-way valve is connected with the trailer braking control valve.
On the basis of the technical scheme, the two-way check valve comprises:
the pipeline comprises a pipeline, wherein both ends of the pipeline are air inlets of two-way one-way valves, the side wall of the pipeline is provided with an opening, and the opening is an air outlet of the two-way one-way valve;
and a piston located within and slidable within the tube, the piston having a diameter that is the same as the inner diameter of the tube.
On the basis of the technical scheme, the two-way check valve further comprises 2 limiting blocks, one limiting block is located in a pipeline at an air inlet of the two-way check valve, the other limiting block is located in a pipeline at another air inlet of the two-way check valve, and an opening is formed in the middle of the limiting blocks.
On the basis of the technical scheme, the number of the air cylinders is three, and the air cylinders are respectively a first air cylinder, a second air cylinder and a third air cylinder, wherein the first air cylinder and the second air cylinder are connected with the brake foot valve, and the third air cylinder is connected with an air inlet of the trailer brake control valve.
On the basis of the technical scheme, the air inlet of the drive shaft relay valve is connected with the second air reservoir.
On the basis of the technical scheme, the air inlet of the front axle relay valve is connected with the first air cylinder.
On the basis of the above technical solution, the brake foot valve includes:
the air inlet of the upper cavity is connected with the second air reservoir, the air outlet of the upper cavity is connected with one air inlet of the driving shaft braking two-way one-way valve and one air inlet of the trailer braking two-way one-way valve, the other air inlet of the trailer braking two-way one-way valve is connected with the air outlet of the driving shaft relay valve, and the other air inlet of the driving shaft braking two-way one-way valve is connected with the second air reservoir through an ASR (asynchronous receiver and transmitter) electromagnetic valve arranged between the second air reservoir and the driving shaft braking two-way one-way valve;
and the air inlet of the lower cavity is connected with the first air reservoir, the air outlet of the lower cavity is connected with both an air inlet of the front axle braking two-way one-way valve and the trailer braking control valve, and the other air inlet of the front axle braking two-way one-way valve is connected with an air outlet of an ABS electromagnetic valve arranged behind the drive axle relay valve.
On the basis of the technical scheme, a front axle wheel end brake chamber is connected to the air outlet of the front axle relay valve, a drive axle wheel end brake chamber is connected to the air outlet of the drive axle relay valve, a trailer wheel end brake chamber is connected to the air outlet of the trailer brake control valve, and the number of the front axle wheel end brake chamber and the number of the drive axle wheel end brake chambers are 2.
On the basis of the technical scheme, trailer emergency brake valves are arranged between the trailer brake control valves and the trailer wheel end brake chambers, the number of the trailer wheel end brake chambers is 6, and the 6 trailer wheel end brake chambers are connected with the trailer emergency brake valves.
On the basis of the technical scheme, an ABS electromagnetic valve is arranged between the front axle relay valve and the front axle wheel end brake chamber, an ABS electromagnetic valve is arranged between the drive axle relay valve and the drive axle wheel end brake chamber, and the ABS electromagnetic valves are connected with the controller.
Compared with the prior art, the invention has the advantages that: under the effect of bi-pass check valve, when the hill start assist function of start vehicle, after loosening brake pedal, all wheel ends of tractor and trailer still keep the brake state, effectively avoid the vehicle to appear the swift current slope risk, and only need when implementing to increase bi-pass check valve to current gas circuit system to the pipeline simply change can, whole car pneumatic structure is simple, and is with low costs.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a diagram illustrating the variation of wheel end brake pressure under the effect of a conventional hill start function;
FIG. 2 is a schematic structural diagram of a pneumatic brake hill start assistance system for a towing vehicle according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a two-way check valve in an embodiment of the present invention;
FIG. 4 is a graph showing the variation of wheel end brake pressure during hill start operation according to the embodiment of the present invention.
In the figure: 1-front axle relay valve, 2-brake foot valve, 3-drive axle relay valve, 4-ASR solenoid valve, 5-drive axle brake two-way check valve, 6-ABS solenoid valve, 7-drive axle wheel end brake chamber, 8-front axle wheel end brake chamber, 9-controller, 10-trailer brake control valve, 11-trailer brake two-way check valve, 12-front axle brake two-way check valve, 13-first air reservoir, 14-second air reservoir, 15-third air reservoir, 16-pipeline, 17-piston, 21-trailer emergency brake valve, 22-trailer wheel end brake chamber.
Detailed Description
The embodiment of the invention provides a tractor air brake hill start auxiliary system, which is characterized in that under the action of a two-way one-way valve, when the hill start auxiliary function of a vehicle is started, after a brake pedal is released, all wheel ends of a tractor and a trailer still keep a braking state, and the vehicle is effectively prevented from slipping on a slope.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 2, the tractor air braking hill start assisting system provided by the embodiment of the invention comprises a two-way check valve, a brake foot valve 2, an air reservoir and a relay valve for controlling air flow to a brake air chamber to realize wheel end braking.
Referring to fig. 3, in the structural schematic diagram of the two-way check valve in the embodiment of the present invention, the two-way check valve includes a pipe 16 and a piston 17 located in the pipe 16 and capable of sliding in the pipe 16, both ends of the pipe 16 are air inlets of the two-way check valve, an opening is formed in a side wall of the pipe 16, the opening is an air outlet of the two-way check valve, a diameter of the piston 17 is the same as an inner diameter of the pipe 16, the two-way check valve further includes 2 limiting blocks, one limiting block is located in the pipe 16 at an air inlet of the two-way check valve, the other limiting block is located in the pipe 16 at the other air inlet of the two-way check valve, and an opening is formed in the middle.
When 2 air inlets of the two-way one-way valve are filled with air flow, when the air flow filled in the left air inlet is larger than the air flow filled in the right air inlet, the piston 17 slides to the right side of the pipeline 16 to block the air inlet on the right side of the two-way one-way valve, and at the moment, the air flow flowing out of the air outlet of the two-way one-way valve is the air flow filled in the left air inlet; when the airflow introduced from the right air inlet is larger than the airflow introduced from the left air inlet, the piston 17 slides to the left side of the pipeline 16 to block the air inlet on the left side of the two-way check valve, and at the moment, the airflow flowing out of the air outlet of the two-way check valve is the airflow introduced from the right air inlet. In the practical application process of the two-way one-way valve provided by the embodiment of the invention, the condition that the sizes of the air flows introduced into the left and right air inlets are the same does not exist.
According to the tractor air brake hill start auxiliary system, the relay valve comprises a front shaft relay valve 1, a driving shaft relay valve 3 and a trailer brake control valve 10. The two-way check valve consists of 2 air inlets and 1 air outlet and comprises a front axle braking two-way check valve 12, a driving axle braking two-way check valve 5 and a trailer braking two-way check valve 11. The air inlet of the brake foot valve 2 is connected with an air reservoir. An air inlet of a front axle braking two-way check valve 12 is connected with an air outlet of a lower cavity of a brake foot valve 2, an air inlet of a driving axle braking two-way check valve 5 and an air inlet of a trailer braking two-way check valve 11 are connected with an air outlet of an upper cavity of the brake foot valve 2, another air inlet of the front axle braking two-way check valve 12 and another air inlet of the trailer braking two-way check valve 11 are connected with an air outlet of an ABS electromagnetic valve 6 arranged behind a driving axle relay valve 3, another air inlet of the driving axle braking two-way check valve 5 is connected with an air storage cylinder, an ASR electromagnetic valve 4 is arranged between the air inlet and the air storage cylinder, and the switch of the ASR electromagnetic valve 4 is controlled by a controller 9. The air outlet of the front axle braking two-way one-way valve 12 is connected with the front axle relay valve 1, the air outlet of the driving axle braking two-way one-way valve 5 is connected with the driving axle relay valve 3, and the air outlet of the trailer braking two-way one-way valve 11 is connected with the trailer braking control valve 10. The front axle relay valve 1 is used for controlling the front axle wheel end of the tractor to brake, the driving axle relay valve 3 is used for controlling the driving axle wheel end of the tractor to brake, and the trailer brake control valve 10 is used for controlling the trailer wheel end to brake.
Specifically, the air cylinders comprise three air cylinders, namely a first air cylinder 13, a second air cylinder 14 and a third air cylinder 15, wherein the first air cylinder 13 and the second air cylinder 14 are both connected with the brake foot valve 2, and the third air cylinder 15 is connected with an air inlet of the trailer brake control valve 10. The air inlet of the drive shaft relay valve 3 is connected to the second air cartridge 14. The air inlet of the front axle relay valve 1 is connected with a first air cylinder 13.
The foot valve 2 includes an upper chamber and a lower chamber. An air inlet of the upper cavity is connected with a second air reservoir 14, an air outlet of the upper cavity is connected with an air inlet of a driving shaft braking two-way check valve 5 and an air inlet of a trailer braking two-way check valve 11, the other air inlet of the trailer braking two-way check valve 11 is connected with an air outlet of a driving shaft relay valve 3, and the other air inlet of the driving shaft braking two-way check valve 5 is connected with the second air reservoir 14 through an ASR electromagnetic valve 4 arranged between the second air reservoir 14 and the driving shaft braking two-way check valve 5. The air inlet of the lower cavity is connected with a first air reservoir 13, the air outlet of the lower cavity is connected with an air inlet of a front axle braking two-way one-way valve 12 and a trailer braking control valve 10, and the other air inlet of the front axle braking two-way one-way valve 12 is connected with the air outlet of an ABS electromagnetic valve 6 arranged behind a drive axle relay valve 3.
The air outlet of the front axle relay valve 1 is connected with a front axle wheel end brake chamber 8, the air outlet of the drive axle relay valve 3 is connected with a drive axle wheel end brake chamber 7, the air outlet of the trailer brake control valve 10 is connected with a trailer wheel end brake chamber 22, and the number of the front axle wheel end brake chambers 8 and the number of the drive axle wheel end brake chambers 7 are 2. Trailer emergency brake valves 21 are arranged between the trailer brake control valve 10 and the trailer wheel end brake air chambers 22, the number of the trailer wheel end brake air chambers 22 is 6, and the 6 trailer wheel end brake air chambers 22 are all connected with the trailer emergency brake valves 21. An ABS electromagnetic valve 6 is arranged between the front axle relay valve 1 and the front axle wheel end brake air chamber 8, an ABS electromagnetic valve 6 is arranged between the drive axle relay valve 3 and the drive axle wheel end brake air chamber 7, and the ABS electromagnetic valves 6 are all connected with a controller 9. An air outlet of an ABS electromagnetic valve 6 at the rear end of the drive shaft relay valve 3 is connected with an air inlet on the right side of a front shaft braking two-way one-way valve 12 and an air inlet on the right side of a trailer braking two-way one-way valve 11.
The principle of the tractor air brake hill start assist system of the embodiment of the present invention will be specifically described below.
When a driver steps on a brake pedal, the upper cavity and the lower cavity of the brake foot valve 2 both output air flows, the air flow output by the upper cavity reaches an air inlet on the left side of the trailer brake two-way check valve 11 and an air inlet on the left side of the drive shaft brake two-way check valve 5, the air flow of the air inlet on the left side of the trailer brake two-way check valve 11 is larger than that of the air inlet on the right side, the air flow of the air inlet on the left side of the trailer brake two-way check valve 11 flows out from an air outlet and reaches the trailer brake control valve 10, and therefore the trailer brake control valve 10 is opened, the air flow of the third air reservoir 15 can flow to the trailer; at the moment, the airflow at the left air inlet of the drive shaft braking two-way check valve 5 is larger than the airflow at the right air inlet, and the airflow at the left air inlet of the drive shaft braking two-way check valve 5 flows out from the air outlet and reaches the drive shaft relay valve 3, so that the drive shaft relay valve 3 is opened, the airflow of the second air reservoir 14 can flow to the drive axle wheel end braking air chamber 7, and the drive axle wheel end of the tractor is braked; the air flow output by the lower cavity reaches the front axle brake two-way check valve 12 and the trailer brake control valve 10, at the moment, the trailer brake control valve 10 is kept in an open state, and the air flow of the third air reservoir 15 flows to the trailer wheel end brake air chamber 22 to brake the trailer wheel end; when the air flow output by the lower cavity reaches the front shaft braking two-way one-way valve 12, the air flow at the left air inlet of the front shaft braking two-way one-way valve 12 is larger than the air flow at the right air inlet, the air flow at the left air inlet of the front shaft braking two-way one-way valve 12 flows out from the air outlet to reach the front shaft relay valve 1, the front shaft relay valve 1 is opened, and the air flow of the first air reservoir 13 can flow to the front shaft wheel end braking air chamber 8 to brake the front shaft wheel end of the tractor.
When a driver presses a hill start auxiliary switch to release a brake pedal, the brake foot valve 2 is closed at the moment, the upper cavity and the lower cavity of the brake foot valve 2 do not output air flow any more, but the ASR electromagnetic valve 4 is opened under the control of the controller 9 at the moment, the air flow of the second air storage cylinder 14 reaches the right air inlet of the driving shaft brake two-way one-way valve 5, the air flow of the right air inlet of the driving shaft brake two-way one-way valve 5 is larger than that of the left air inlet, the air flow of the right air inlet of the driving shaft brake two-way one-way valve 5 flows out from the air outlet and reaches the driving shaft relay valve 3, so that the driving shaft relay valve 3 is opened, the air flow of the second air storage cylinder 14 can flow to the driving axle wheel; at the moment, the air flow at the air outlet of the drive shaft relay valve 3 flows to the air inlet at the right side of the front shaft braking two-way one-way valve 12 and the air inlet at the right side of the trailer braking two-way one-way valve 11, at the moment, no air flow exists at the air inlet at the left side of the front shaft braking two-way one-way valve 12, the air flow at the air inlet at the right side of the front shaft braking two-way one-way valve 12 is larger than the air flow at the air inlet at the left side, the air flow at the air inlet at the right side of the front shaft braking two-way one-way valve 12 flows out from the air outlet to reach the front shaft relay valve 1, the front; at this time, no air flow exists at the left air inlet of the trailer braking two-way check valve 11, the air flow at the right air inlet of the trailer braking two-way check valve 11 is larger than that at the left air inlet, the air flow at the right air inlet of the trailer braking two-way check valve 11 flows out from the air outlet and reaches the trailer braking control valve 10, so that the trailer braking control valve 10 is opened, the air flow of the third air reservoir 15 can flow to the trailer wheel end braking air chamber 22, and the trailer wheel end is braked.
In the process of hill start, the air pressure at the air outlet of the ABS electromagnetic valve 6 at the rear end of the drive shaft relay valve 3 is gradually reduced to 0, the air pressure at the air outlets of the front shaft brake two-way one-way valve 12 and the trailer brake two-way one-way valve 11 is also reduced to 0, at the moment, the wheel end brakes of the tractor and the trailer are released, and the hill start assisting function is finished.
Referring to fig. 4, which is a diagram of the change of the brake air pressure at the wheel end under the action of the hill start assisting function according to the embodiment of the present invention, when the vehicle is running on a hill, the driver steps on the brake pedal until the vehicle is stationary, keeps the brake pedal still, then presses the hill start assisting switch, and under the action of the hill start assisting controller 9, when the driver releases the brake pedal, the brake air pressure at all the wheel ends is still maintained, and as the driver steps on the accelerator, the brake air pressure at all the wheel ends is gradually reduced to 0, and the hill start assisting is ended.
According to the tractor air brake hill start auxiliary system provided by the embodiment of the invention, under the action of the two-way one-way valve, when the hill start auxiliary function of the vehicle is started, after the brake pedal is released, all wheel ends of the tractor and the trailer still keep a braking state, so that the vehicle is effectively prevented from running slope risk, and in the implementation, only the two-way one-way valve is added to the existing air path system, and the pipeline is simply changed, so that the whole vehicle pneumatic structure is simple, and the cost is low.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A tractor air brake hill start assist system, comprising:
the relay valve is used for controlling air flow to flow into the brake air chamber to achieve wheel end braking and comprises a front axle relay valve (1), a driving axle relay valve (3) and a trailer braking control valve (10);
the double-way check valve comprises 2 air inlets and 1 air outlet, and comprises a front axle braking double-way check valve (12), a driving axle braking double-way check valve (5) and a trailer braking double-way check valve (11);
the brake pedal valve (2) and the air reservoir, the air inlet of the brake pedal valve (2) is connected with the air reservoir;
wherein, an air inlet of front axle braking bi-pass check valve (12) links to each other with the gas outlet of braking foot valve (2) cavity of resorption, an air inlet of drive shaft braking bi-pass check valve (5), an air inlet of trailer braking bi-pass check valve (11) all link to each other with the gas outlet of braking foot valve (2) epicoele, another air inlet of front axle braking bi-pass check valve (12), another air inlet of trailer braking bi-pass check valve (11) all link to each other with the gas outlet of the ABS solenoid valve (6) that drive shaft relay valve (3) rear set up, another air inlet of drive shaft braking bi-pass check valve (5) links to each other with the gas holder, and is equipped with ASR solenoid valve (4) between this air inlet and the gas holder, the switch of ASR solenoid valve (4) is controlled by controller (9), the gas outlet of front axle braking bi-pass check valve (12) links to each other with front axle relay valve (1), an air outlet of the driving shaft braking two-way check valve (5) is connected with the driving shaft relay valve (3), and an air outlet of the trailer braking two-way check valve (11) is connected with the trailer braking control valve (10).
2. A tractor air brake hill start assist system as set forth in claim 1 wherein said two-way check valve comprises:
the pipeline (16), both ends of the pipeline (16) are air inlets of two-way check valves, an opening is arranged on the side wall of the pipeline (16), and the opening is an air outlet of the two-way check valve;
a piston (17) located within the conduit (16) and slidable within the conduit (16), the piston (17) having a diameter equal to the internal diameter of the conduit (16).
3. A tractor air brake hill start assist system as set forth in claim 2 wherein: the bi-pass check valve still includes 2 stoppers, and one of them stopper is located pipeline (16) of bi-pass check valve air inlet department, and another stopper is located pipeline (16) of another air inlet department of bi-pass check valve, the trompil has been seted up at the middle part of stopper.
4. A tractor air brake hill start assist system as set forth in claim 1 wherein: the air cylinders comprise three air cylinders which are respectively a first air cylinder (13), a second air cylinder (14) and a third air cylinder (15), wherein the first air cylinder (13) and the second air cylinder (14) are both connected with the brake foot valve (2), and the third air cylinder (15) is connected with an air inlet of the trailer brake control valve (10).
5. A tractor air brake hill start assist system as set forth in claim 4 wherein: the air inlet of the drive shaft relay valve (3) is connected with a second air cylinder (14).
6. A tractor air brake hill start assist system as set forth in claim 4 wherein: and the air inlet of the front axle relay valve (1) is connected with a first air cylinder (13).
7. A tractor air brake hill start assist system as claimed in claim 4, characterized in that the brake foot valve (2) comprises:
an air inlet of the upper cavity is connected with a second air reservoir (14), an air outlet of the upper cavity is connected with an air inlet of a driving shaft braking two-way check valve (5) and an air inlet of a trailer braking two-way check valve (11), the other air inlet of the trailer braking two-way check valve (11) is connected with an air outlet of a driving shaft relay valve (3), and the other air inlet of the driving shaft braking two-way check valve (5) is connected with the second air reservoir (14) through an ASR electromagnetic valve (4) arranged between the second air reservoir (14) and the driving shaft braking two-way check valve (5);
and the air inlet of the lower cavity is connected with a first air reservoir (13), the air outlet of the lower cavity is connected with one air inlet of a front axle braking two-way check valve (12) and a trailer braking control valve (10), and the other air inlet of the front axle braking two-way check valve (12) is connected with the air outlet of an ABS electromagnetic valve (6) arranged behind a drive axle relay valve (3).
8. A tractor air brake hill start assist system as set forth in claim 1 wherein: the brake system is characterized in that a front axle wheel end brake chamber (8) is connected to the air outlet of the front axle relay valve (1), a drive axle wheel end brake chamber (7) is connected to the air outlet of the drive axle relay valve (3), a trailer wheel end brake chamber (22) is connected to the air outlet of the trailer brake control valve (10), and the number of the front axle wheel end brake chamber (8) and the number of the drive axle wheel end brake chamber (7) are 2.
9. A tractor air brake hill start assist system as set forth in claim 8 wherein: be equipped with trailer emergency brake valve (21) between trailer brake control valve (10) and trailer wheel end brake chamber (22), trailer wheel end brake chamber (22) are 6, and 6 trailer wheel end brake chambers (22) all link to each other with trailer emergency brake valve (21).
10. A tractor air brake hill start assist system as set forth in claim 8 wherein: an ABS electromagnetic valve (6) is arranged between the front axle relay valve (1) and the front axle wheel end brake air chamber (8), the ABS electromagnetic valve (6) is arranged between the drive axle relay valve (3) and the drive axle wheel end brake air chamber (7), and the ABS electromagnetic valve (6) is connected with a controller (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010652898.6A CN111907502B (en) | 2020-07-08 | 2020-07-08 | Tractor air brake hill start auxiliary system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010652898.6A CN111907502B (en) | 2020-07-08 | 2020-07-08 | Tractor air brake hill start auxiliary system |
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| Publication Number | Publication Date |
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| CN111907502A true CN111907502A (en) | 2020-11-10 |
| CN111907502B CN111907502B (en) | 2021-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010652898.6A Active CN111907502B (en) | 2020-07-08 | 2020-07-08 | Tractor air brake hill start auxiliary system |
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| Country | Link |
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| CN (1) | CN111907502B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112977375A (en) * | 2021-02-26 | 2021-06-18 | 徐工集团工程机械股份有限公司科技分公司 | Engineering machinery anti-lock braking system and engineering machinery |
| CN113291274A (en) * | 2021-06-30 | 2021-08-24 | 三一汽车起重机械有限公司 | Vehicle brake system and work vehicle |
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| CN103213575A (en) * | 2013-05-15 | 2013-07-24 | 郑州宇通客车股份有限公司 | Relay valve control method and device in hill starting process and air braking system |
| CN104590226A (en) * | 2013-10-31 | 2015-05-06 | 北汽福田汽车股份有限公司 | Hill start assisting device and vehicle |
| US20150217740A1 (en) * | 2012-09-17 | 2015-08-06 | Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh | Brake control system for a utility vehicle having a trailer |
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| DE3709797A1 (en) * | 1986-03-27 | 1987-12-10 | Gerhard Woerther Gmbh | Vehicle with pressure medium-actuated servo operating system and method for its operation and system for filling this |
| US20150217740A1 (en) * | 2012-09-17 | 2015-08-06 | Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh | Brake control system for a utility vehicle having a trailer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112977375A (en) * | 2021-02-26 | 2021-06-18 | 徐工集团工程机械股份有限公司科技分公司 | Engineering machinery anti-lock braking system and engineering machinery |
| CN113291274A (en) * | 2021-06-30 | 2021-08-24 | 三一汽车起重机械有限公司 | Vehicle brake system and work vehicle |
| CN113291274B (en) * | 2021-06-30 | 2022-03-01 | 三一汽车起重机械有限公司 | Vehicle brake system and work vehicle |
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|---|---|
| CN111907502B (en) | 2021-05-11 |
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