Brake system for new energy chassis of fire fighting truck

Abstract

The invention discloses a braking system for a new energy chassis of an airport fire truck, and belongs to the technical field of airport fire trucks. The system comprises a control module which is used for judging the posture of a vehicle and pre-judging a driver according to collected vehicle body inclination angle data, steering wheel rotation angle data and wheel speed data, and sending a braking control instruction according to the posture of the vehicle and a driving intention; the execution module is used for adjusting a wheel service brake chamber according to the brake control instruction sent by the control module and the high-pressure gas provided by the gas supply module; the gas supply module is used for providing high-pressure gas for the gas consumption element of the whole vehicle; according to the system, the brake pressure of a single tire is intelligently adjusted by collecting the wheel speed, the inclination angle, the steering wheel rotation angle, the brake pressure and other information of the whole vehicle, and the high-speed running stability of the whole vehicle is guaranteed.

Description

Technical Field

[0001] The invention relates to a braking system for a new energy chassis of a fire truck, belonging to the technical field of airport fire trucks. Background Art

[0002] Rapid mobilization vehicles and main foam vehicles are the ceiling of the field of fire rescue equipment. They have the characteristics of large vehicle liquid load and fast acceleration. At present, these two types of equipment equipped in airports have long been monopolized by imported fuel vehicles. With the improvement of airport rescue efficiency, traditional fuel vehicles are affected by power type and transmission type, and their acceleration performance is limited. They can no longer meet the airport's demand for rescue speed. With the advantage of the rapid development of domestic new energy, extended-range hybrid fire trucks have become the direction of industry development. The air compressor of the braking system of traditional fuel vehicles is driven by the engine, and the vehicle is only equipped with ABS anti-lock braking system.

[0003] At present, the prior art related to the present invention is mainly represented by the following patents: (1) Air compressor and engine with the same, authorization announcement number: CN214787913U, the patent discloses an air compressor and engine with the same, characterized in that the air compressor includes a cylinder head, a valve plate and a cylinder body, the cylinder head is provided with a first exhaust hole, the first exhaust hole is provided with a filter, the valve plate is arranged at the bottom of the cylinder head, the valve plate is provided with a second exhaust hole, the second exhaust hole is provided with a matching filter, and the cylinder body is arranged at the bottom of the valve plate. By using the air compressor in this technical solution, the filter on the cylinder head and the filter on the valve plate can filter the gas discharged by the air compressor, so that tiny liquid oil droplets are easily blocked inside the air compressor, and the remaining oil and gas will enter the exhaust pipe of the vehicle brake system, and finally enter the air storage tank through the dryer, reducing the oil entering the rear exhaust system and the air compressor failure rate, thereby improving reliability.

[0004] (2) Oil-gas composite ABS anti-lock braking system, authorization announcement number: CN108099879B, the patent discloses an oil-gas composite ABS anti-lock braking system, which is characterized by including a composite electric controller ECU, a hydraulic regulator, and an air pressure regulator. The composite electric controller ECU includes a calculation unit, a control unit, and a monitoring unit connected in sequence; one end of the hydraulic regulator is connected to a brake master cylinder connected to a liquid reservoir, and the other end is connected to the front wheel brake; the brake master cylinder is connected to the gas tank and one end of the air pressure regulator through a hydraulically controlled air valve, and the other end of the air pressure regulator is connected to the rear wheel brake. The invention has dual braking energy sources: oil pump and air pump, and the dual braking insurance is safer. At the same time, it absorbs the advantages of simple structure of oil brake ABS and large braking force of air brake ABS, and overcomes the disadvantages of small braking force of oil brake ABS and large cost and complexity of air brake ABS. The oil-gas composite ABS anti-lock braking system of the invention is a safe and reliable braking system.

[0005] (1) Patent 1: The air compressor is driven by an engine. Frequent starting and stopping is not conducive to energy saving and also generates emission pollution.

[0006] (2) Although the ABS anti-lock braking system of Patent 2 uses both hydraulic and air power sources and takes into account the advantages of both, it does not meet the requirements for vehicle stability when driving at high speeds. Summary of the invention

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a braking system for a new energy chassis of a fire truck to solve the problem that the prior art ABS anti-lock braking system uses two power sources, hydraulic and air, which brings instability during high-speed driving; In order to achieve the above purpose / solve the above technical problems, the present invention is implemented by adopting the following technical solutions: A braking system for a new energy chassis of a fire truck, comprising: A control module is used to determine the vehicle's posture and the driver's prejudgment based on the collected vehicle body inclination data, steering wheel angle data, and wheel speed data, and to send a brake control command based on the vehicle's posture and driving intention; An execution module, used for adjusting the wheel service brake air chamber according to the brake control command sent by the control module and the high-pressure gas provided by the air supply module; Gas supply module, used to provide high-pressure gas to gas components of the whole vehicle; Among them, the control module includes an ESC system, an integrated detection module, and an electric air compressor control module. The ESC system intakes or exhausts the wheel service brake air chamber according to the control command to realize brake control and vehicle parking brake. The integrated detection module is used to collect information such as the air pressure and brake signal of each circuit of the vehicle, and transmit the information to the vehicle ECU for control decision-making; the electric air compressor control module is used to transmit the high-pressure gas provided by the air supply module to the ESC system through the 21-circuit air cylinder, the 22-circuit air cylinder and the 23-circuit air cylinder according to the control command received by the vehicle ECU.

[0008] Optionally, the ESC system includes an AEBS relay valve, an ABS valve, a brake pedal and a parking handle; the execution module includes a wheel-side brake air chamber, wherein the front axle single-side tire is equipped with two brake air chambers, the left air chamber 1 and the right air chamber 1 of the first axle are driving brake air chambers, the left air chamber 2 and the right air chamber 2 of the first axle are driving and parking integrated brake air chambers, and the single-side tires of the second and third axles are equipped with driving and parking integrated brake air chambers; Among them, the 21-circuit air reservoir is respectively connected to the 11th port of the brake pedal and the 1th port of the rear axle AEBS relay valve, and the 22-circuit air reservoir is respectively connected to the 12th port of the brake pedal and the 1th port of the front axle AEBS relay valve; the 21st port of the rear axle AEBS relay valve is connected to the 1st port of the left ABS valve of the rear axle, the 22nd port of the rear axle AEBS relay valve is connected to the 1st port of the right ABS valve of the rear axle, the 2nd port of the left ABS valve of the rear axle is connected to the 11th port of the left air chamber of the second and third axles, and the 2nd port of the right ABS valve of the rear axle is connected to the 11th port of the right air chamber of the second and third axles; the 21st and 22nd ports of the front axle AEBS relay valve are respectively connected to the 1st port of the left and right ABS valves of the front axle, and the front axle Port 2 of the left and right ABS valves are connected to port 11 of the left air chamber 1 of axle 1, port 11 of the left air chamber 2 of axle 1, and port 11 of the right air chamber 1 of axle 1, and port 11 of the right air chamber 2 of axle 1; port 21 and port 22 of the brake pedal are connected to port 4 of the rear axle AEBS relay valve and the front axle AEBS relay valve respectively, the 23-circuit air reservoir is connected to port 1 of the parking handle and port 1 of the front axle manual relay valve and the rear axle manual relay valve respectively, port 2 of the front axle manual relay valve and the rear axle manual relay valve are connected to port 12 of the left air chamber 2 and the right air chamber 2 of axle 1 and port 12 of the left air chamber and the right air chamber of axle 2, and port 12 of the left air chamber and the right air chamber of axle 3 respectively, and port 2 of the parking handle is connected to port 4 of the front / rear axle manual relay valve respectively.

[0009] Optionally, the ESC system is composed of an ABS anti-lock braking system and an ASR drive wheel anti-skid system. The ABS anti-lock braking system reads the wheel speed of each wheel through the ABS ECU. When it is detected that the wheel speed of a certain wheel is 0, the braking force is reduced by controlling the on-off of the air circuit of the ABS valve of the single wheel. The ESC system reads the vehicle body inclination sensor, the steering wheel angle sensor and the wheel speed sensor signals of each wheel through the ESC ECU, determines the posture of the vehicle at this time and predicts the driver, sends control instructions to the AEBS relay valve and the ABS valve, and adjusts the steering according to the control instructions.

[0010] Optionally, the AEBS relay valve comprises an air inlet 1, an air outlet 21, an air outlet 22, an exhaust port 31, an exhaust port 3, a control port 4, an exhaust coil 6.1 and an air inlet coil 6.3. When the brake pedal is pressed, air is taken in through port 4 of the AEBS relay valve, and port 1 of the AEBS relay valve is connected to ports 21 and 22. When the brake pedal is released, port 1 of the AEBS relay valve is disconnected from ports 21 and 22, and ports 21, 22 are connected to port 31, and high-pressure gas is discharged to release the brake. When the exhaust coil 6.1 and the air inlet coil 6.3 of the AEBS relay valve are energized, The high-pressure gas at port 1 flows in through the solenoid valve 6.3. At this time, port 1 of the AEBS relay valve is connected to ports 21 and 22, and the one-way valve at port 4 is squeezed to shield the high-pressure gas at port 4. When the exhaust coil 6.1 and the intake coil 6.3 are powered off, port 1 is disconnected from ports 21 and 22, and ports 21, 22 are connected to port 32. The high-pressure gas is discharged and the brakes are released.

[0011] Optionally, the ABS valve includes an air inlet 71, an air outlet 72, an exhaust port 73, an exhaust coil 7.1 and an intake coil 7.3. Port 1 and port 2 of the ABS valve are normally open. When the exhaust coil 7.1 and the intake coil 7.3 are energized, port 71 and port 72 are disconnected, and port 72 and port 73 are connected, so that the high-pressure gas is discharged through port 73 to reduce the braking intensity.

[0012] Optionally, the air supply module also includes an electric air compressor, a dryer, and a four-circuit valve. The air is compressed by the electric air compressor to become high-pressure gas, which is filtered by the dryer and then stored in the 21-circuit air cylinder, 22-circuit air cylinder, 23-circuit air cylinder and 24-circuit air cylinder respectively through the four-circuit valve.

[0013] Optionally, the 24-circuit air storage cylinder is used to connect the air intakes of air horns, air seats, suspension rigidity / elasticity, and inter-wheel and inter-axle differentials, providing an air source for various auxiliary air components of the vehicle.

[0014] Optionally, when the parking handle is pulled up and is in the parking position, ports 1 and 2 of the parking brake valve are not connected, ports 1 and 2 of the front axle manual relay valve and the rear axle manual relay valve are not connected, no high-pressure gas passes through port 12 of each air chamber, and the air chamber relies on spring force to clamp the brake to achieve parking braking of the entire vehicle; when the parking handle is lowered and is in the driving position, ports 1 and 2 of the parking brake valve are connected, and high-pressure gas flows into control port No. 4 of the front axle manual relay valve and the rear axle manual relay valve, and ports 1 and 2 of the front axle manual relay valve and the rear axle manual relay valve are connected, and high-pressure gas flows into port 12 of each air chamber, and the springs of each air chamber are pushed open by the high-pressure gas to release the parking brake.

[0015] Optionally, the control logic of the electric air compressor control module includes: judging according to the dryer feedback port switch detection signal and the air pressure values ​​of the 21-circuit air storage cylinder and the 22-circuit air storage cylinder: Enable conditions: The feedback port signal is 1, the vehicle ECU sends a control signal to the drive motor, the high voltage electricity is conducted to the electric air compressor through the battery, the air compressor starts, and starts pumping; Closing conditions: The feedback port signal is 0, with a delay of 5s, and the vehicle ECU sends a control signal to the drive motor. The electric air compressor is not powered, the air compressor is turned off, and pumping stops.

[0016] Optionally, the control logic of the electric air compressor control module further includes: (1) When the air pressure values ​​of the 21-circuit air storage cylinder and the 22-circuit air storage cylinder are ≤ the set value, if the feedback port detection signal is 0, the dryer feedback port pressure sensor is reported to be faulty, but the electric air compressor is turned on and starts to inflate, which lasts for 6 minutes; (2) When the air pressure values ​​of the 21-circuit air storage cylinder and the 22-circuit air storage cylinder are ≥ the set value, if the feedback port detection signal is 1, the dryer feedback port pressure sensor is reported to be faulty, the electric air compressor is shut down, and the inflation is stopped; (3) If the electric air compressor works for more than 15 minutes, it will shut down and the instrument will report a fault.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention is equipped with an ESC system, which improves high-speed driving stability and enables airport fire trucks to carry out rescue operations more safely and efficiently; The present invention adopts an integrated detection module to integrate the multi-position sensors, which facilitates the layout of electrical circuits and vehicle maintenance; The present invention arranges the brake air chamber reasonably, saves installation space and makes the whole vehicle more compact while meeting the braking torque requirements of the whole vehicle; The brake system air supply module provided by the present invention adopts an electric air compressor, which is driven by high voltage electricity and can be reasonably started and stopped by control logic, thereby achieving energy saving and emission reduction. In summary, the present invention consists of three parts: an air supply module, a control module and an execution module. The air compressor of the air supply module is powered by high voltage electricity, and can intelligently adjust the start and stop of the air compressor according to the needs of the whole vehicle, thereby providing a continuous air source for the air circuit of the whole vehicle; the control module is equipped with an electronic stability control system, which intelligently adjusts the brake pressure of a single tire by collecting information such as the wheel speed, inclination angle, steering wheel angle, brake pressure, etc. of the whole vehicle to ensure the high-speed driving stability of the whole vehicle. The braking system uses high voltage electricity as a power source and does not generate emission pollution; it is equipped with an ESC system to ensure high-speed driving stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a diagram of the brake system of the present invention; Figure 2 This is a gas path flow principle diagram of the present invention; Figure 3 This is the control logic diagram of the present invention; Figure 4 This is the principle diagram of the AEBS relay valve of the present invention; Figure 5 This is a schematic diagram of the ABS valve of the present invention. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0022] like Figure 1-Figure 5 As shown, a brake system for a new energy chassis of a fire truck is disclosed, including: pneumatic brake, which is composed of three parts: air supply module, control module and execution module, wherein the air compressor of the air supply module is powered by high voltage electricity, and the start and stop of the air compressor can be intelligently adjusted according to the needs of the whole vehicle, providing a continuous air source for the air circuit of the whole vehicle; the control module is equipped with an electronic stability control system (ESC system for short), which intelligently adjusts the brake pressure of a single tire by collecting information such as the wheel speed, inclination angle, steering wheel angle, and brake pressure of the whole vehicle to ensure the high-speed driving stability of the whole vehicle; the control module is also equipped with an integrated detection module, which can comprehensively monitor the air pressure value and brake signal of each circuit and transmit them to the controller; the execution module adopts a caliper disc brake, and according to the braking performance requirements of the whole vehicle, the tire on one side of the front axle is equipped with a driving brake air chamber and a driving and parking integrated brake air chamber, and the tire on one side of the rear axle is equipped with a driving and parking integrated brake air chamber, with a compact overall structure and high braking efficiency. The braking system uses high voltage electricity as the power source, does not generate emission pollution, and is equipped with an ESC system to ensure high-speed driving stability.

[0023] The air supply module consists of an electric air compressor, a dryer, a four-circuit valve, a 21-circuit air cylinder, a 22-circuit air cylinder, a 23-circuit air cylinder, and a 24-circuit air cylinder; among them, the 21-circuit air cylinder and the 22-circuit air cylinder are used to supply air for the service brake. This vehicle is a three-axle vehicle. Since the wheelbase of the second and third axles is relatively small, the second and third axles can be equivalent to the rear axle. The 21-circuit air cylinder supplies air to the rear axle, and the 22-circuit air cylinder supplies air to the front axle; the 23-circuit air cylinder supplies air for the parking brake; the 24-circuit air cylinder is used for auxiliary air and supplies air to other air-consuming components of the vehicle.

[0024] The control module consists of three parts: ESC system, integrated detection module, and electric air compressor control module; The ESC system consists of the ESC ECU, body tilt sensor, steering wheel angle sensor, wheel speed sensor, AEBS relay valve, ABS valve, brake pedal (including foot brake valve), and parking handle (including hand brake valve); The integrated detection module is composed of a 21-circuit air pressure sensor, a 22-circuit air pressure sensor, a 23-circuit air pressure sensor, a 24-circuit air pressure sensor, a front axle parking brake light switch, a rear axle parking brake light switch, a driving brake light switch, and a driving brake pressure sensor; The electric air compressor control module consists of the vehicle ECU, battery, and drive motor.

[0025] The execution module is mainly composed of wheel-side brake air chambers, air horns, air seats, suspension rigidity / elasticity, and inter-wheel / inter-axle differentials. The front axle is equipped with two brake air chambers on one side of the tire. The left chamber 1 and the right chamber 1 of one axle are service brake air chambers, the left chamber 2 and the right chamber 2 of one axle are driving and parking integrated brake air chambers, and the second and third axles are equipped with one brake air chamber on one side of the tire, all of which are driving and parking integrated brake air chambers.

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] like Figure 1 As shown, the brake system is mainly composed of three parts: air supply module, control module and execution module. The air supply module is composed of electric air compressor, dryer, four-circuit valve, 21-circuit air reservoir, 22-circuit air reservoir, 23-circuit air reservoir and 24-circuit air reservoir; the control module includes ESC system, integrated detection module and electric air compressor control module; the ESC system is composed of ESC ECU, body tilt sensor, steering wheel angle sensor, wheel speed sensor, AEBS relay valve, ABS valve, brake pedal (including foot brake valve) and parking handle (including hand brake valve); The body inclination sensor is installed near the center of mass of the vehicle to collect the vehicle roll signal. The steering wheel angle sensor is installed on the steering column to collect the steering wheel angle information. The wheel speed sensor is installed on the wheel side to read the wheel speed. The integrated detection module consists of a 21-loop air pressure sensor, a 22-loop air pressure sensor, a 23-loop air pressure sensor, a 24-loop air pressure sensor, a front axle parking brake light switch, a rear axle parking brake light switch, a driving brake light switch, and a driving brake pressure sensor; the electric air compressor control module consists of a vehicle ECU, a battery, and a drive motor; the execution module is mainly composed of a wheel-side brake air chamber, an air horn, an air seat, suspension rigidity / elasticity, and wheel / axle differentials.

[0028] like Figure 2 As shown, the figure shows the flow direction of high-pressure gas, where the hollow arrows represent the gas flow direction and the solid arrows represent the control loop gas flow direction.

[0029] The air is compressed by an electric air compressor and becomes high-pressure gas. After being filtered by a dryer, the high-pressure air is stored in the 21-circuit air storage cylinder, 22-circuit air storage cylinder, 23-circuit air storage cylinder and 24-circuit air storage cylinder through a four-circuit valve.

[0030] The 21-circuit air reservoir is connected to port 11 of the brake pedal (including the foot brake valve) and port 1 of the rear axle AEBS relay valve, and the 22-circuit air reservoir is connected to port 12 of the brake pedal (including the foot brake valve) and port 1 of the front axle AEBS relay valve; Ports 21 and 22 of the rear axle AEBS relay valve are connected to ports 1 of the left and right ABS valves of the rear axle respectively, and ports 2 of the left and right ABS valves of the rear axle are connected to ports 11 of the left air chamber of the second and third axles and ports 11 of the right air chamber of the second and third axles respectively; Ports 21 and 22 of the front axle AEBS relay valve are connected to ports 1 of the left and right ABS valves of the front axle respectively, and ports 2 of the left and right ABS valves of the front axle are connected to ports 11 of the left air chamber 1 and 2 of the first axle and ports 11 of the right air chamber 1 and 2 of the first axle respectively; Ports 21 and 22 of the brake pedal (including the foot brake valve) are connected to port 4 of the rear / front axle AEBS relay valve respectively; when the brake pedal is pressed, ports 11 and 21, ports 12 and 22 of the foot brake valve are connected, and high-pressure gas flows into ports 4 of the rear and front axle AEBS relay valves. At this time, ports 1 and 21, 22 of the rear / front axle AEBS relay valves are connected, and high-pressure gas flows into each brake air chamber, thereby driving the brake to clamp the brake disc, thereby achieving braking; the advantage of this arrangement is that the high-pressure gas is always at the air inlet of the rear / front axle AEBS relay valve. When the brake pedal is pressed, the high-pressure gas quickly connects port 1 and ports 21, 22 of the rear / front axle AEBS relay valve through control port No. 4, and the high-pressure gas quickly reaches the actuator air chamber, with a fast response time and high braking efficiency.

[0031] The 23-circuit air reservoir is connected to port 1 of the parking handle (including the hand brake valve) and port 1 of the front and rear axle manual relay valves respectively. Port 2 of the front / rear axle manual relay valves is connected to port 12 of the left / right air chamber 2 of the first axle and port 12 of the left / right air chamber of the second and third axles respectively. The 2 ports of the parking handle (including the hand brake valve) are connected to the 4 ports of the front and rear axle hand relay valves respectively; The parking brake is a gas-off spring brake, that is, the parking brake is achieved by the spring force of the air chamber, and the parking brake is released by high-pressure air; when the parking handle is pulled up and is in the parking position, ports 1 and 2 of the parking brake valve are not connected, ports 1 and 2 of the front / rear axle manual relay valve are not connected, and no high-pressure gas passes through ports 12 of each air chamber. The air chamber relies on spring force to clamp the brake to achieve the parking brake of the entire vehicle; when the parking handle is lowered and is in the driving position, ports 1 and 2 of the parking brake valve are connected, and high-pressure gas flows into control port No. 4 of the front and rear axle manual relay valves. At this time, ports 1 and 2 of the front and rear axle manual relay valves are connected, and high-pressure gas flows into ports 12 of each air chamber, and the springs of each air chamber are pushed open by the high-pressure gas to release the parking brake.

[0032] The 24-circuit air storage cylinder is respectively connected to the air intake of the air horn, air seat, suspension rigidity / elasticity, and inter-wheel / inter-axle differential to provide air source for various auxiliary air components of the vehicle.

[0033] like Figure 3 As shown in the figure, the control logic between the various components of the control module is shown, where the dotted arrows represent signal collection and the solid arrows represent the flow of control signals. The control module mainly consists of three parts: the integrated detection module, the electric air compressor control module and the ESC system. The integrated detection module is mainly used to collect information such as the air pressure and brake signals of each circuit of the vehicle, and transmit the information to the vehicle ECU for control decision-making. At the same time, the detection sensors are arranged in an integrated manner to facilitate the layout and maintenance of the vehicle's electrical circuits.

[0034] like Figure 5 As shown in the figure, the electric air compressor control module is mainly used to control the start and stop of the electric air compressor. By intelligently controlling the start and stop of the air compressor, it can ensure the gas demand of the whole vehicle while reducing energy consumption. At the same time, it has intelligent diagnosis function to ensure gas safety. The control logic of the electric air compressor is as follows: After the vehicle is powered on, the following is judged based on the dryer feedback switch detection signal and the air pressure values ​​of the 21-circuit air reservoir and the 22-circuit air reservoir: The pressure is less than a certain set value, in this example, 6 bar is used, and the feedback port pressure signal is 1; The pressure is greater than a certain set value, 6 bar in this example, and the feedback port pressure signal is 0; Enable conditions: The feedback port signal is 1, the vehicle ECU sends a control signal to the drive motor, the high voltage electricity is conducted to the electric air compressor through the battery, the air compressor starts, and starts pumping.

[0035] Closing conditions: The feedback port signal is 0, with a delay of 5s, and the vehicle ECU sends a control signal to the drive motor. The electric air compressor is not powered, the air compressor is turned off, and pumping stops.

[0036] Exceptions: (1) When the air pressure values ​​of the 21-circuit air storage cylinder and the 22-circuit air storage cylinder are ≤ a certain set value, 8 bar in this example, if the feedback port detection signal is 0, the dryer feedback port pressure sensor failure is reported, but the electric air compressor is turned on and starts to charge, which lasts for 6 minutes; (2) When the air pressure values ​​of the 21-circuit air storage cylinder and the 22-circuit air storage cylinder are ≥ a certain set value, 11 bar in this example, if the feedback port detection signal is 1, the dryer feedback port pressure sensor fault is reported, the electric air compressor is shut down, and the inflation stops; (3) If the electric air compressor works for more than 15 minutes, it will shut down and the instrument will report a fault; like Figure 3 As shown, the present invention adopts an ESC system, which is composed of an ABS anti-lock braking system and an ASR drive wheel anti-skid system. The ABS anti-lock braking system only reads the wheel speed of each wheel through the ABS ECU. When it is detected that the wheel speed of a certain wheel is 0, the braking force is reduced by controlling the on-off of the air path of the ABS valve of a single wheel to prevent the certain wheel from being locked; and the ESC system reads the vehicle body inclination sensor, the steering wheel angle sensor and the wheel speed sensor signals of each wheel through the ESC ECU, comprehensively judges the posture of the vehicle at this time and the intention of the driver, and then sends control instructions to the AEBS relay valve and the ABS valve respectively through the control logic and the built-in control program, which can effectively prevent understeering and oversteering.

[0037] like Figure 4 , Figure 5 As shown, the AEBS relay valve includes an air inlet 1, an air outlet 21, an air outlet 22, an exhaust port 31, an exhaust port 3 control port 4, an exhaust coil 6.1, a grounding coil 6.2 and an intake coil 6.3, and the ABS valve includes an air inlet 71, an air outlet 72, an exhaust port 73, an exhaust coil 7.1, a grounding coil 7.2 and an intake coil 7.3.

[0038] When the brake pedal is depressed, air is taken in through port 4 of the AEBS relay valve. At this time, port 1 of the AEBS relay valve is connected to ports 21 and 22. When the brake pedal is released, port 1 is disconnected from ports 21 and 22, ports 21 and 22 are connected to port 31, and the high-pressure gas is discharged, releasing the brake. When the exhaust coil 6.1 and the intake coil 6.3 of the AEBS relay valve are energized, the high-pressure gas at port 1 flows in through the solenoid valve 6.3. At this time, port 1 of the AEBS relay valve is connected to ports 21 and 22, and the one-way valve at port 4 is squeezed to shield the high-pressure gas at ports 4. When the exhaust coil 6.1 and the intake coil 6.3 are de-energized, port 1 is disconnected from ports 21 and 22, ports 21 and 22 are connected to port 32, and the high-pressure gas is discharged, releasing the brake. Ports 71 and 72 of the ABS valve are normally open. When the exhaust coil 7.1 and the intake coil 7.3 are energized, ports 71 and 72 are disconnected, and ports 72 and 73 are connected, so that the high-pressure gas is discharged through port 73 to reduce the braking intensity.

[0039] Combination Figure 3 , Figure 4 , Figure 5 To briefly describe the control logic, when the vehicle speed is below 30km / h, the AEBS relay valve electronic control does not participate in the control, and only relies on the on and off of the ABS valve to prevent a certain wheel of the vehicle from locking. When the speed of a certain wheel is close to 0, the solenoid valve coil of the wheel is energized to reduce the braking intensity of the wheel to prevent the wheel from locking; when the vehicle speed is between 30km / h and 60km / h, only the AEBS relay valve participates in the control. At this time, even if the brake pedal is not depressed, when the vehicle detects signals from the body inclination sensor, steering wheel transfer sensor, wheel speed sensor, etc., and finds that the vehicle has the risk of skidding or rolling over, the AEBS relay valve is actively controlled to energize its coil, apply braking force to a certain wheel to control the speed of the wheel, and prevent the vehicle from rolling over; when the vehicle speed is greater than 60km / h, the AEBS relay valve and the ABS valve participate in the control together. At this time, the vehicle speed is high and a quick response is required to control the stability of the entire vehicle. The two work simultaneously to ensure that the vehicle reaches stability at the fastest speed.

[0040] In summary, the present invention consists of three parts: an air supply module, a control module and an execution module. The air compressor of the air supply module is powered by high voltage electricity, and can intelligently adjust the start and stop of the air compressor according to the needs of the whole vehicle, thereby providing a continuous air source for the air circuit of the whole vehicle; the control module is equipped with an electronic stability control system, which intelligently adjusts the brake pressure of a single tire by collecting information such as the wheel speed, inclination angle, steering wheel angle, brake pressure, etc. of the whole vehicle to ensure the high-speed driving stability of the whole vehicle. The braking system uses high voltage electricity as a power source and does not generate emission pollution; it is equipped with an ESC system to ensure high-speed driving stability.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A braking system for a new energy chassis of a fire truck, characterized in that: include: A control module is used to determine the vehicle's posture and the driver's prejudgment based on the collected vehicle body inclination data, steering wheel angle data, and wheel speed data, and to send a brake control command based on the vehicle's posture and driving intention; An execution module, used for adjusting the wheel service brake air chamber according to the brake control command sent by the control module and the high-pressure gas provided by the air supply module; Gas supply module, used to provide high-pressure gas to gas components of the whole vehicle; Among them, the control module includes an ESC system, an integrated detection module, and an electric air compressor control module. The ESC system intakes or exhausts the wheel service brake air chamber according to the control command to realize brake control and vehicle parking brake. The integrated detection module is used to collect information such as the air pressure and brake signal of each circuit of the vehicle, and transmit the information to the vehicle ECU for control decision-making; the electric air compressor control module is used to transmit the high-pressure gas provided by the air supply module to the ESC system through the 21-circuit air cylinder, the 22-circuit air cylinder and the 23-circuit air cylinder according to the control command received by the vehicle ECU.

2. The braking system for the new energy chassis of a fire truck according to claim 1 is characterized in that: The ESC system includes an AEBS relay valve, an ABS valve, a brake pedal and a parking handle; the execution module includes wheel-side brake air chambers, wherein the front axle single-side tire is equipped with two brake air chambers, the left air chamber 1 and the right air chamber 1 of the first axle are driving brake air chambers, the left air chamber 2 and the right air chamber 2 of the first axle are driving and parking integrated brake air chambers, and the single-side tires of the second and third axles are equipped with driving and parking integrated brake air chambers; Among them, the 21-circuit air reservoir is respectively connected to the 11th port of the brake pedal and the 1th port of the rear axle AEBS relay valve, and the 22-circuit air reservoir is respectively connected to the 12th port of the brake pedal and the 1th port of the front axle AEBS relay valve; the 21st port of the rear axle AEBS relay valve is connected to the 1st port of the left ABS valve of the rear axle, the 22nd port of the rear axle AEBS relay valve is connected to the 1st port of the right ABS valve of the rear axle, the 2nd port of the left ABS valve of the rear axle is connected to the 11th port of the left air chamber of the second and third axles, and the 2nd port of the right ABS valve of the rear axle is connected to the 11th port of the right air chamber of the second and third axles; the 21st and 22nd ports of the front axle AEBS relay valve are respectively connected to the 1st port of the left and right ABS valves of the front axle, and the front axle Port 2 of the left and right ABS valves are connected to port 11 of the left air chamber 1 of axle 1, port 11 of the left air chamber 2 of axle 1, and port 11 of the right air chamber 1 of axle 1, and port 11 of the right air chamber 2 of axle 1; port 21 and port 22 of the brake pedal are connected to port 4 of the rear axle AEBS relay valve and the front axle AEBS relay valve respectively, the 23-circuit air reservoir is connected to port 1 of the parking handle and port 1 of the front axle manual relay valve and the rear axle manual relay valve respectively, port 2 of the front axle manual relay valve and the rear axle manual relay valve are connected to port 12 of the left air chamber 2 and the right air chamber 2 of axle 1 and port 12 of the left air chamber and the right air chamber of axle 2, and port 12 of the left air chamber and the right air chamber of axle 3 respectively, and port 2 of the parking handle is connected to port 4 of the front / rear axle manual relay valve respectively.

3. The braking system for the new energy chassis of a fire truck according to claim 2, characterized in that: The ESC system is composed of an ABS anti-lock braking system and an ASR drive wheel anti-skid system. The ABS anti-lock braking system reads the wheel speed of each wheel through the ABS ECU. When it is detected that the wheel speed of a certain wheel is 0, the braking force is reduced by controlling the on-off of the air circuit of the ABS valve of a single wheel. The ESC system reads the vehicle body inclination sensor, the steering wheel angle sensor and the wheel speed sensor signals of each wheel through the ESC ECU, determines the posture of the vehicle at this time and predicts the driver, sends control instructions to the AEBS relay valve and the ABS valve, and adjusts the steering according to the control instructions.

4. The braking system for the new energy chassis of a fire truck according to claim 2, characterized in that: The AEBS relay valve comprises an air inlet 1, an air outlet 21, an air outlet 22, an exhaust port 31, an exhaust port 3, a control port 4, an exhaust coil (6.1) and an air inlet coil (6.3). When the brake pedal is depressed, air is inletted from the 4 ports of the AEBS relay valve, and port 1 of the AEBS relay valve is connected to ports 21 and 22. When the brake pedal is released, port 1 of the AEBS relay valve is disconnected from ports 21 and 22, and ports 21, 22 are connected to port 31, and high-pressure gas is discharged, releasing the brake. When the exhaust coil (6.1) and the air inlet coil (6.3) of the AEBS relay valve are energized, The high-pressure gas at port 1 flows in through the solenoid valve (6.3). At this time, port 1 of the AEBS relay valve is connected to ports 21 and 22, and the one-way valve at port 4 is squeezed to shield the high-pressure gas at port 4. When the exhaust coil (6.1) and the intake coil (6.3) are powered off, port 1 is disconnected from ports 21 and 22, and ports 21, 22 are connected to port 32. The high-pressure gas is discharged and the brake is released.

5. The braking system for the new energy chassis of a fire truck according to claim 4 is characterized in that: The ABS valve comprises an air inlet 71, an air outlet 72, an exhaust port 73, an exhaust coil (7.1) and an air inlet coil (7.3). Ports 1 and 2 of the ABS valve are normally open. When the exhaust coil (7.1) and the air inlet coil (7.3) are energized, ports 71 and 72 are disconnected, and ports 72 and 73 are connected, so that high-pressure gas is discharged through port 73, thereby reducing the braking intensity.

6. The braking system for the new energy chassis of a fire truck according to claim 2, characterized in that: The air supply module also includes an electric air compressor, a dryer, and a four-circuit valve. The air is compressed by the electric air compressor and becomes high-pressure gas. After being filtered by the dryer, the high-pressure air is stored in the 21-circuit air storage cylinder, the 22-circuit air storage cylinder, the 23-circuit air storage cylinder, and the 24-circuit air storage cylinder respectively through the four-circuit valve.

7. The braking system for the new energy chassis of a fire truck according to claim 6 is characterized in that: The 24-circuit air storage cylinder is used to connect the air intakes of the air horn, air seat, suspension rigidity / elasticity, and inter-wheel and inter-axle differentials, providing an air source for various auxiliary air components of the vehicle.

8. The braking system for the new energy chassis of a fire truck according to claim 2 is characterized in that: When the parking handle is pulled up and is in the parking position, ports 1 and 2 of the parking brake valve are not connected, ports 1 and 2 of the front axle manual relay valve and the rear axle manual relay valve are not connected, no high-pressure gas passes through port 12 of each air chamber, and the air chamber relies on spring force to clamp the brake to achieve parking braking of the entire vehicle; when the parking handle is lowered and is in the driving position, ports 1 and 2 of the parking brake valve are connected, and high-pressure gas flows into control port No. 4 of the front axle manual relay valve and the rear axle manual relay valve, and ports 1 and 2 of the front axle manual relay valve and the rear axle manual relay valve are connected, and high-pressure gas flows into port 12 of each air chamber, and the springs of each air chamber are pushed open by the high-pressure gas to release the parking brake.

9. The fire truck new energy chassis braking system according to claim 1 is characterized in that: The control logic of the electric air compressor control module includes: judging according to the dryer feedback port switch detection signal and the air pressure values ​​of the 21-circuit air storage cylinder and the 22-circuit air storage cylinder: Enable conditions: The feedback port signal is 1, the vehicle ECU sends a control signal to the drive motor, the high voltage electricity is conducted to the electric air compressor through the battery, the air compressor starts, and starts pumping; Closing conditions: The feedback port signal is 0, with a delay of 5s, and the vehicle ECU sends a control signal to the drive motor. The electric air compressor is not powered, the air compressor is turned off, and pumping stops.

10. The braking system for the new energy chassis of a fire truck according to claim 9 is characterized in that: The control logic of the electric air compressor control module also includes: (1) When the air pressure values ​​of the 21-circuit air storage cylinder and the 22-circuit air storage cylinder are ≤ the set value, if the feedback port detection signal is 0, the dryer feedback port pressure sensor is reported to be faulty, but the electric air compressor is turned on and starts to inflate, which lasts for 6 minutes; (2) When the air pressure values ​​of the 21-circuit air storage cylinder and the 22-circuit air storage cylinder are ≥ the set value, if the feedback port detection signal is 1, the dryer feedback port pressure sensor is reported to be faulty, the electric air compressor is shut down, and the inflation is stopped; (3) If the electric air compressor works for more than 15 minutes, it will shut down and the instrument will report a fault.

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