A pneumatic EBS for dangerous goods semi-trailer transport vehicles

Abstract

The invention relates to the field of automobile brake systems, and discloses an air pressure EBS for a semi-trailer transport vehicle for dangerous goods. The air pressure EBS comprises an EBS ECU, an automatic pressure regulating valve, a pressure differentiator, a front brake chamber, an electronically controlled brake master valve, a double-chamber brake chamber, a wear sensor, a speed sensor, a steering tire pressure sensor, and an emergency cut-off valve control pipeline pressure sensor. The brake chamber is connected to the automatic pressure regulating valve, the electronically controlled brake master valve and an air tank in sequence through a pneumatic pipeline, and a pressure differentiator is installed on the brake chamber. A semi-trailer brake handbrake is separately installed to control the braking force of the semi-trailer in the event of EBS electronic control failure. According to national requirements for semi-trailer transport vehicles for dangerous goods, a tire blowout emergency safety device and an emergency cut-off valve are included in the EBS monitoring range. The invention has important significance for improving the safety of semi-trailer transport vehicles for dangerous goods.

Description

Technical Field

[0001] The invention relates to the field of automobile braking systems, and in particular to an air pressure EBS of a semi-trailer transport vehicle for dangerous goods. Background Art

[0002] At present, the pneumatic electronic parking system (EBS) of domestic dangerous goods semi-trailer transport vehicles mainly consists of electronically controlled brake master valve, air reservoir, air pressure control valve (ABS valve and proportional relay valve, as well as bridge valves containing the functions of the above two valves, etc.), trailer valve, emergency relay valve, pneumatic brake pipeline and brake chamber, EBS ECU, various sensors (force sensor, brake friction pad wear sensor, coupling force sensor, etc.) and electronic control circuits. The driver transmits the pedal stroke and pedal force signal to the EBSECU by actuating the brake main valve pedal to identify the driver's braking intention; the ECU integrates the real-time data of each sensor to evaluate the current state of the vehicle, and then calculates and outputs the target pressure value according to the corresponding control strategy, and implements braking by controlling the air pressure control element to shorten the braking response time and braking distance; at the same time, the proportional relay valve is used to balance the difference between the target pressure and the actual pressure to ensure braking smoothness; the anti-lock action is achieved by cyclically controlling the ABS valve and maintaining the best slip rate.

[0003] In the above-mentioned EBS used on dangerous goods semi-trailer transport vehicles, a proportional relay valve is often required to cooperate with an ABS valve or a bridge valve that integrates the functions of the above two valves to realize the air pressure control function. However, the core technologies of the above-mentioned valves are in the hands of foreign manufacturers and are expensive. Domestic products of the same type have a certain gap with foreign products in terms of function and performance, which has led to the current mature solutions being heavily dependent on foreign manufacturers, which to a certain extent hinders the large-scale popularization of EBS on domestic dangerous goods semi-trailer transport vehicles. In addition, since the braking coordination between the tractor and the semi-trailer is controlled by the EBS controller after the installation of EBS, most solutions have abandoned the separate semi-trailer brake hand valve.

[0004] At the same time, with the implementation date of the relevant provisions in GB 7258-2017, all dangerous goods transport trucks with a total mass greater than or equal to 12,000 kg should be equipped with an electronic braking system (EBS), and the national standard also puts forward further clear requirements for the tire emergency safety device (TESD) and emergency shut-off valve on dangerous goods transport trucks, which has new design requirements and directions for the EBS of this type of vehicle. Summary of the invention

[0005] In order to overcome the above problems and meet the requirements of national standards, the present invention provides a new type of air pressure EBS for dangerous goods semi-trailer transport vehicles. The technical solution adopted by the present invention is:

[0006] A pneumatic EBS for a semitrailer transport vehicle for dangerous goods, comprising an EBS ECU, a retarder ECU, an electronically controlled brake master valve, a four-circuit protection valve, a parking air tank, a front axle air tank, a rear axle air tank, an automatic pressure regulating valve, a pressure differential meter, a front axle brake air chamber, a double-chamber brake air chamber, a parking manual control valve, a semitrailer brake handbrake, a trailer valve, a quick release valve, an emergency relay valve, a trailer parking valve, a wear sensor, a wheel speed sensor and an emergency shut-off valve control pipeline pressure sensor, the air tank is respectively connected to the front axle air tank, the rear axle air tank and the parking air tank through an energy supply pipeline via a four-circuit protection valve; the EBS The ECU is connected to the retarder ECU, the automatic pressure regulating valves of the front and rear axles and the semi-trailer, the electronically controlled brake master valve, the wear sensor, the wheel speed sensor, the steering tire pressure sensor, the emergency shut-off valve control line pressure sensor and the pressure differential meter through the electronic control lines; the front axle air tank is connected to the automatic pressure regulating valve through the energy supply line, the electronically controlled brake master valve is connected to the automatic pressure regulating valve through the control line, the automatic pressure regulating valve is connected to the front axle brake air chamber through the energy supply line, and a pressure differential meter is installed on the brake air chamber; the electronically controlled brake master valve control line is connected to the pneumatic control ports of the rear axle automatic pressure regulating valve and the trailer valve, and the automatic pressure regulating valve is connected to the brake air chamber, A pressure differential gauge is installed on the brake air chamber; the brake air chamber on the front axle of the tractor and semi-trailer and the double-chamber brake air chamber on the rear axle are connected to the automatic pressure regulating valve through the energy supply pipeline; the parking air tank is connected to the parking manual control valve through the energy supply pipeline, the parking manual control valve is connected to the semi-trailer brake hand brake and trailer valve in turn through the control pipeline, and the parking manual control valve is connected to the quick release valve and the double-chamber brake air chamber spring chamber in turn through the energy supply pipeline; the emergency relay valve is connected to the automatic pressure regulating valve and the quick release valve on the semi-trailer through the energy supply pipeline, the quick release valve is connected to the spring chamber of the double-chamber brake air chamber through the energy supply pipeline, and the emergency relay valve is connected to the automatic pressure regulating valve on the semi-trailer through the control pipeline. The automatic pressure regulating valve is directly connected and driven with the EBS ECU through the signal line, and can also be driven through the pneumatic pipeline of the brake pedal valve. The interfaces at both ends of the pressure differential gauge are respectively connected to the brake air chamber measurement port, the pressure differential gauge is connected to the EBS ECU, and the brake pressure change rate is collected and transmitted to the EBS ECU. The parking manual control valve is a dual-channel manual control valve, one channel is connected in series with the trailer valve after the semi-trailer brake handbrake, and the other channel is connected to the air inlet of the parking system quick release valve. The control air of the emergency shut-off valve is provided by the air tank, and a pressure sensor is installed in the middle, which is connected to the EBS ECU; to ensure that when the vehicle is started, the EBS ECU can detect the pressure of the emergency shut-off valve control air pipeline in real time. If there is control air pressure in the control pipeline, it means that the emergency shut-off valve is not closed. The EBS ECU will limit the vehicle speed to below 5km / h and remind the driver to manually close the valve in the form of an indicator light; all wheels of the tractor are equipped with wear sensors and wheel speed sensors, and the first and third axes of the semi-trailer are equipped with wheel speed sensors and wear sensors, and the second axis is only equipped with a wear sensor; the retarder ECU is connected to the EBS ECU to work together.The steering tire pressure sensor is connected to the EBS ECU via a wireless radio frequency module and can transmit tire pressure in real time. If a tire blowout occurs during driving, the EBS ECU will adjust the control strategy based on the abnormal feedback from the steering tire pressure sensor and cooperate with TESD to ensure the vehicle's braking ability.

[0007] Compared with the prior art, the present invention has the following beneficial effects:

[0008] 1. A new automatic pressure regulating valve is used to realize the pressure control function. A pressure differentiator is installed to calculate the real-time brake pressure change rate, which is used as a control variable in the EBS control calculation. The automatic pressure regulating valve is installed near the brake air chamber and is directly controlled by the EBS ECU, shortening the pipeline distance and thus shortening the brake response time.

[0009] 2. The installation of wear sensors and retarder ECU can not only monitor the wear status of the brake lining in real time, but also make full use of auxiliary braking, meeting the safety requirements of regulations for dangerous goods transport vehicles.

[0010] 3. Connect the semi-trailer handbrake in series between the parking manual control valve and the trailer valve so that the valve can be used to control the braking force of the semi-trailer after the EBS electronic control fails, and cooperate with the electronically controlled brake master valve to ensure that there is no collision or folding between the tractor and the semi-trailer.

[0011] 4. Install a pressure sensor on the emergency shut-off valve control air pipe. The EBS ECU can detect the status of the emergency shut-off valve when the vehicle is started. If it is in the open state, it will warn the driver and limit the vehicle speed if necessary until the driver closes the valve.

[0012] 5. Install a tire pressure sensor at the steering wheel of the tractor to detect tire pressure changes and adjust the control algorithm appropriately when a tire bursts, and cooperate with TESD to ensure the vehicle's braking ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the arrangement of the air pressure EBS of the dangerous goods semi-trailer transport vehicle of the present invention.

[0014] In the figure: air compressor 1, dryer 2, air tank 3, four-circuit protection valve 4, parking air tank 5, semi-trailer brake handbrake 6, trailer valve 7, main trailer air pipe joint 8, parking manual valve 9, rear axle air tank 10, double-chamber brake air chamber 11, wear sensor 12, wheel speed sensor 13, front axle brake air chamber 14, pressure differentiator 15, automatic pressure regulating valve 16, electronically controlled brake main valve 17, front axle air tank 18, EBS ECU 19, retarder ECU 20, quick release valve 21, semi-trailer electronic control interface 22, emergency relay valve 23, trailer air tank 24, trailer parking valve 25, steering tire pressure sensor 26 and emergency shut-off valve control line pressure sensor 27. DETAILED DESCRIPTION

[0015] Below, the embodiments of the present invention are further described in conjunction with the accompanying drawings:

[0016] like Figure 1 The figure shows a new type of air pressure EBS for a semi-trailer transport vehicle for dangerous goods, including an EBS ECU 19, a retarder ECU 20, an electronically controlled brake master valve 17, a four-circuit protection valve 4, a parking air tank 5, a front axle air tank 18, a rear axle air tank 10, an automatic pressure regulating valve 16, a pressure differentiator 15, a front axle brake air chamber 14, a double-chamber brake air chamber 11, a parking manual control valve 9, a semi-trailer brake handbrake 6, a trailer valve 7, a quick release valve 21, an emergency relay valve 23, a trailer parking valve 25, a wear sensor 12, a wheel speed sensor 13, a steering tire pressure sensor 26 and an emergency shut-off valve control line pressure sensor 27 and other components. The air tank 3 is connected to the front axle air tank 18, the rear axle air tank 10 and the parking air tank 5 through the energy supply pipeline through the four-circuit protection valve 4; the front axle air tank 18 is connected to the electric control brake master valve 17 and the automatic pressure regulating valve 16 through the energy supply pipeline, the electric control brake master valve 17 is connected to the automatic pressure regulating valve 16 through the control pipeline, the automatic pressure regulating valve 16 is connected to the front axle brake air chamber 14 through the energy supply pipeline, and the pressure differentiator 15 is installed on the front axle brake air chamber 14; the output of the rear axle air tank 10 is similar to that of the front axle air tank 18, except that the control gas output by the electric control brake master valve 17 is connected to the rear axle automatic pressure regulating valve 16 and the trailer valve 7, the automatic pressure regulating valve 16 is connected to the double-chamber brake air chamber 11, and a pressure differential meter 15 is installed on the double-chamber brake air chamber 11. The pressure differentiator 15; the parking air tank 5 is connected to the parking manual control valve 9 and the trailer valve 7 respectively by energy supply pipelines, the parking manual control valve 9 is connected to the semi-trailer brake hand brake 6 and the trailer valve 7 in sequence by a control pipeline, the parking manual control valve 9 is connected to the quick release valve 21 and the spring chamber of the double-chamber brake air chamber 11 in sequence by an energy supply pipeline; the trailer valve 7 is connected to the emergency relay valve 23 by energy supply and control pipelines respectively, the emergency relay valve 23 is connected to the automatic pressure regulating valve 16 on the semi-trailer, the front axle brake air chamber 14, the front brake air chamber of the double-chamber brake air chamber 11 and the quick release valve 21 by an energy supply pipeline, the quick release valve 21 is connected to the spring chamber of the double-chamber brake air chamber 11 by an energy supply pipeline; the emergency relay valve 23 is connected to the automatic pressure regulating valve 16 on the trailer by a control pipeline; EBS The ECU 19 is connected to the retarder ECU 20, the automatic pressure regulating valve 16 of the front and rear axles and the semi-trailer part (integrated through the semi-trailer electronic control interface 22), the electronically controlled brake master valve 17, the wear sensor 12, the wheel speed sensor 13, the steering tire pressure sensor 26, the emergency shut-off valve control pipeline pressure sensor 27 and the pressure differentiator 15 through electronic control lines.

[0017] When the driver steps on the brake pedal 17, the brake pedal can convert the action information applied by the driver to the brake pedal into an electrical signal, and transmit the signal to the EBS ECU 19, so as to identify the driver's braking intention; the EBS ECU 19 simultaneously receives the wheel speed and brake disc wear information from the wheel speed sensor 13 and the wear sensor 12, and receives the pressure change rate information of each brake air chamber from the pressure differentiator 15, and after comprehensively processing the received information, calculates through the built-in control strategy, and outputs control instructions to the automatic pressure regulating valve 16 on the front axle, rear axle, and semi-trailer axle; after receiving the instruction, the automatic pressure regulating valve 16 outputs the corresponding pressure to each brake air chamber according to the instruction, pushes the brake to implement braking, and thus completes the braking action; at the same time, the EBSECU 19 continuously receives the real-time feedback signal received from each sensor, and continuously corrects the control target value, so as to improve the braking safety.

[0018] In addition, for the automatic pressure regulating valve 16, the EBS ECU 19 performs anti-lock control according to the wheel speed information detected by the wheel speed sensor 13 and the information collected by other vehicle sensors, and sends the corresponding anti-lock control signal to control the on and off of the high-speed switch valve inside the automatic pressure regulating valve 16, thereby controlling the anti-lock action of the front axle wheels, rear axle wheels, and semi-trailer axle wheels to ensure that the entire vehicle will not skid or even drift due to wheel locking during braking.

[0019] Taking into account the possible failure risk of the electronic system, in order to ensure that the semi-trailer dangerous goods transport vehicle can still brake effectively in the event of electronic control failure and improve vehicle braking safety, the traditional pneumatic brake circuit is retained in the EBS solution.

[0020] During service braking, compressed air can be transmitted to the automatic pressure regulating valve 16 of each axle through the electric control brake master valve 17 to open the corresponding opening to control the brake pressure of each axle, thereby realizing service braking of the tractor. In addition, the air source from the tractor is also filled into the trailer air storage tank 24 as a backup air source. When the electric control brake master valve 17 is stepped on for service braking, the compressed air is transmitted to the trailer control valve 7, and transmitted to the automatic pressure regulating valve of the semi-trailer through the main trailer connector 8, which controls the opening to the corresponding opening, so that the compressed gas is filled into the trailer brake air chamber, thereby completing the service braking of the semi-trailer.

[0021] When the vehicle needs to park, the semi-trailer brake handbrake 6 is kept normally open, the driver operates the handle of the parking manual valve 9, the control gas is disconnected to open the quick release valve 21, and the gas in the spring chamber of the double-chamber brake air chamber 11 of the rear axle of the tractor is quickly discharged from the quick release valve 21. Under the action of the return spring, the spring chamber completes the exhaust brake action to form the parking brake of the tractor; and for the parking of the semi-trailer part, when the driver in the tractor pulls up the parking manual valve 9, the control gas entering the trailer valve 7 is disconnected, so that the control gas outlet in the trailer valve 7 is opened, causing the trailer emergency relay valve 23 to output control gas to the automatic pressure regulating valve 16, and the automatic pressure regulating valve 16 is supplied to the brake air chamber through the trailer air tank 24, so as to complete the parking operation of the semi-trailer in the cab. If long-term parking is required, the driver needs to close the trailer parking handle 25 to complete the pressure relief of the quick release valve 21, so that the double-chamber brake air chamber 11 on the semi-trailer completes the pressure relief parking under the action of the spring chamber return spring.

[0022] When the EBS electronic control fails and emergency braking is required during driving, the braking coordination of the semitrailer and the tractor can be achieved by simultaneously controlling the opening of the semitrailer's brake handbrake 6 and the brake pedal 17, and the tractor can be decelerated by reversely towing the semitrailer by controlling the braking force of the semitrailer alone, and the impact caused by the mismatch of braking force between the semitrailer and the tractor, the side slip of the tractor, or the folding of the car train can be effectively avoided.

[0023] When the vehicle is started, the EBS ECU 19 will detect the signal of the emergency shut-off valve control line pressure sensor 27. If there is control air pressure in the control line, it means that the emergency shut-off valve is not closed. The EBS ECU 19 will limit the vehicle speed to below 5 km / h and remind the driver to manually close the valve in the form of an indicator light.

[0024] For vehicles with a tire blowout emergency safety device (TESD) installed on the steering wheel, the EBS ECU 19 will detect the signal of the steering tire pressure sensor 26 in real time. If a tire blowout occurs during driving, the EBS ECU 19 will adjust the control mode according to the abnormal feedback of the steering tire pressure sensor 26 and cooperate with the TESD to ensure the braking ability of the vehicle.

[0025] For those skilled in the art, various other adaptive adjustments and changes can be made according to the technical solutions and concepts described above, and all of these adjustments and changes should fall within the scope of protection of the claims of the present invention.

Claims

1. A pneumatic EBS for a dangerous goods semi-trailer transport vehicle, characterized by: It includes EBS ECU, retarder ECU, electronically controlled brake master valve, four-circuit protection valve, parking air tank, front axle air tank, rear axle air tank, automatic pressure regulating valve, pressure differentiator, front axle brake air chamber, double-chamber brake air chamber, parking manual valve, semi-trailer brake handbrake, trailer valve, quick release valve, emergency relay valve, trailer parking valve, wear sensor, wheel speed sensor and emergency shut-off valve control pipeline pressure sensor. The air tank is connected to the front axle air tank, rear axle air tank and parking air tank respectively through the energy supply pipeline through the four-circuit protection valve; the front axle air tank is connected to the automatic pressure regulating valve through the energy supply pipeline, and the electronically controlled brake The main valve is connected to the automatic pressure regulating valve with a control pipeline, the automatic pressure regulating valve is connected to the front axle brake air chamber with an energy supply pipeline, and a pressure differentiator is installed on the brake air chamber; the control pipeline of the electronically controlled brake main valve is respectively connected to the pneumatic control interfaces of the rear axle automatic pressure regulating valve and the trailer valve, the automatic pressure regulating valve is connected to the brake air chamber, and a pressure differentiator is installed on the brake air chamber; the parking air tank is connected to the parking manual control valve with an energy supply pipeline, the parking manual control valve is connected to the semi-trailer brake handbrake and the trailer valve in turn with a control pipeline, and the parking manual control valve is connected to the quick release valve and the double-chamber brake air chamber spring chamber in turn with an energy supply pipeline; the EBS The ECU is connected to the retarder ECU, the automatic pressure regulating valves of the front and rear axles and the semi-trailer, the electronically controlled brake master valve, the wear sensor, the wheel speed sensor, the steering tire pressure sensor, the emergency shut-off valve control line pressure sensor and the pressure differentiator through electronic control lines respectively; the emergency relay valve is connected to the automatic pressure regulating valve and the quick release valve on the semi-trailer through an energy supply line, the quick release valve is connected to the spring chamber of the double-chamber brake air chamber through an energy supply line, and the emergency relay valve is connected to the automatic pressure regulating valve on the semi-trailer through a control line.

2. The pneumatic EBS for dangerous goods semi-trailer transport vehicle according to claim 1 is characterized by: The brake air chamber on the front axle and the double-chamber brake air chamber on the rear axle of the tractor and semi-trailer are connected to the automatic pressure regulating valve through the energy supply pipeline. The automatic pressure regulating valve is directly connected and driven by the EBS ECU through the signal line, and can also be driven by the brake pedal valve pneumatic pipeline.

3. The pneumatic EBS for dangerous goods semi-trailer transport vehicle according to claim 1 or 2, characterized in that: The interfaces at both ends of the pressure differentiator are respectively connected to the brake chamber measuring ports. The pressure differentiator is connected to the EBS ECU and collects the brake pressure change rate and transmits it to the EBS ECU.

4. The pneumatic EBS for dangerous goods semi-trailer transport vehicle according to claim 3 is characterized by: The parking manual control valve is a dual-channel manual control valve, one channel is connected in series with the semi-trailer brake handbrake and then connected to the trailer valve, and the other channel is connected to the air inlet of the parking system quick release valve.

5. The pneumatic EBS for dangerous goods semi-trailer transport vehicle according to claim 4 is characterized by: The control gas of the emergency shut-off valve is provided by an air tank, and a pressure sensor is installed in the middle to connect with the EBS ECU; all wheels of the tractor are installed with wear sensors and wheel speed sensors, the first and third axles of the semi-trailer are installed with wheel speed sensors and wear sensors, and the second axle is only installed with a wear sensor; the retarder ECU is connected to the EBS ECU to work together.

6. The pneumatic EBS for dangerous goods semi-trailer transport vehicle according to claim 5 is characterized by: The steering tire pressure sensor is connected to the EBS ECU via a wireless radio frequency module and can transmit the tire pressure in real time.

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