Description:TECHNICAL FIELD
[0001] The present disclosure relates to the field of air suspension control system in vehicles. More particularly, the present disclosure relates to a conventional air suspension control system and method incorporated in multi-axle trailers featuring automatic lift and drop mechanisms for lift axle/axles, based on load conditions.

BACKGROUND
[0002] The following description of the related art is intended to provide background information pertaining to the field of the present disclosure. This section may include certain aspects of the art that may be related to various features of the present disclosure. However, it should be appreciated that this section is used only to enhance the understanding of the reader with respect to the present disclosure, and not as admissions of the prior art.
[0003] Conventional multi-axle trailers are equipped with lift axles to optimize weight distribution and improve fuel efficiency when the trailer is not fully loaded. However, existing systems require manual operation or lack intelligent automation, leading to suboptimal axle positioning, increased tire wear, and reduced traction under specific load conditions.
[0004] In traditional air suspension systems, operators manually engage or disengage the lift axle, often relying on guesswork rather than real-time load conditions. Such systems fail to provide seamless operation, leading to inefficiencies such as excessive tire wear, increased fuel consumption, and suboptimal maneuverability in varying road conditions. Additionally, security concerns, such as unauthorized removal of trailer tires, remain unaddressed.
[0005] Thus, there exists a need for an air suspension control system and method for multi-axle trailers with enhanced vehicle performance, traction, and tyre longevity while ensuring safety and efficiency in heavy-duty transport applications.

OBJECTS OF THE PRESENT DISCLOSURE
[0006] Some of the objects of the present disclosure, which at least one embodiment herein satisfies are as listed herein below.
[0007] It is an object of the present disclosure to provide an air suspension control system and method for multi-axle trailers.
[0008] It is another object of the present disclosure to provide multi-axle trailers that feature a sequential dropping mechanism for optimized weight distribution.
[0009] It is another object of the present disclosure to provide a system with temporary lift function that allows better traction and maneuverability.
[0010] It is another object of the present disclosure to provide a system with adaptable settings for different trailer configurations and operational needs.
[0011] It is another object of the present disclosure to provide a system with axles raise or drop based on real-time load conditions.
[0012] It is another object of the present disclosure to provide a system that lift axles drop automatically when the ignition is OFF to prevent unauthorized movement and wheel theft.

SUMMARY
[0013] This summary is provided to introduce certain objects and aspects of the present disclosure in a simplified form that are further described below in the detailed description. This summary is not intended to identify the key features or the scope of the claimed subject matter.
[0014] The present disclosure relates to the field of air suspension control system in vehicles. More particularly, the present disclosure relates to a conventional air suspension control system and method incorporated in multi-axle trailers featuring automatic lift and drop mechanisms for lift axle/axles, based on load conditions.
[0015] An aspect of the present disclosure relates to an air suspension control system for multi-axle trailers. The system includes a trailer lift axle control unit with solenoid valves and a differential pressure switch for managing lift axle operations. A traction switch, programmed with a timer, temporarily raises the lift axle under full load for a predefined duration to improve traction and maneuverability, after which the axle automatically returns to its load-supporting position. The lift axle mechanism operates in multiple modes, including automatic lifting when the trailer is unladen with ignition ON, and automatic dropping when ignition is OFF to prevent tire theft. In multi-axle Trailer Lift Axles configurations, sequential axle dropping is implemented, wherein the second axle drops first under partial load, followed by the first axle at full load. The system (100) further incorporates a pressure protection valve, a pressure limiting valve, an air tank for air storage, a leveling valve for maintaining ride height, a quick release valve for rapid air pressure adjustments, and a suspension lift axle control valve for real-time load-based axle positioning. The invention optimizes fuel efficiency, improves trailer maneuverability, and enhances safety.
[0016] Another aspect of the present disclosure relates to a method for controlling lift axle positioning in multi-axle trailers. The method includes the steps of detecting trailer load conditions using a differential pressure switch in conjunction with a buffer volume and throttle valve. A lift axle is automatically lifted or dropped based on predefined thresholds of air pressure. The lift axle is temporarily raised via a traction switch for a predetermined time duration to optimize vehicle maneuverability. The method further includes automatically restoring the lift axle to its load-bearing position after the traction-assist duration expires.
[0017] Various objects, features, aspects and advantages of the present disclosure will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like features.
[0018] Within the scope of this application, it is expressly envisaged that the various aspects, embodiments, examples and alternatives set out in the preceding paragraphs, in the claims and/or in the following description and drawings, and in particular the individual features thereof, may be taken independently or in any combination. Features described in connection with one embodiment are applicable to all embodiments, unless such features are incompatible.

BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In the figures, similar components and/or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label with a second label that distinguishes among the similar components. If only the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label.
[0020] FIG. 1A illustrates an exemplary schematic diagram of the air suspension control system for multi-axle trailers having single Lift Axle, featured Auto Drop & Auto Lift with-Load dependent, in accordance with an embodiment of the present disclosure.
[0021] FIG. 1B illustrates an exemplary schematic circuit diagram of the lift axle control valve of the air suspension control system having single Lift Axle, featured Auto Drop & Auto Lift with-Load dependent, in accordance with an embodiment of the present disclosure.
[0022] FIG. 2A illustrates an exemplary schematic diagram of the air suspension control system for multi-axle trailers having single Lift Axle, featured Auto Drop & Auto Lift with-Load dependent and traction support, in accordance with an embodiment of the present disclosure.
[0023] FIG. 2B illustrates an exemplary schematic circuit diagram of the lift axle control valve of the air suspension control system having single Lift Axle, featured Auto Drop & Auto Lift with-Load dependent and traction support with tyre save system, in accordance with an embodiment of the present disclosure.
[0024] FIG. 3A illustrates an exemplary schematic diagram of the air suspension control system for multi-axle trailers having twin Lift Axles, featured Auto Drop & Auto Lift with-Load dependent, in accordance with an embodiment of the present disclosure.
[0025] FIG. 3B illustrates an exemplary schematic circuit diagram of the lift axle control valve of the air suspension control system having twin Lift Axles, featured Auto Drop & Auto Lift with-Load dependent, in accordance with an embodiment of the present disclosure.
[0026] FIG. 4A illustrates an exemplary schematic diagram of the air suspension control system for multi-axle trailers having twin Lift Axles, featured Auto Drop & Auto Lift with-Load dependent and traction support, in accordance with an embodiment of the present disclosure.
[0027] FIG. 4B illustrates an exemplary schematic circuit diagram of the lift axle control valve of the air suspension control system having twin Lift Axles, featured Auto Drop & Auto Lift with-Load dependent and traction support with tyre save system, in accordance with an embodiment of the present disclosure.
[0028] FIG. 5 illustrates a flow diagram illustrating a method for controlling lift axle positioning in multi-axle trailers, in accordance with an embodiment of the present disclosure.

DETAILED DESCRIPTION
[0029] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such detail as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the scope of the present disclosure as defined by the appended claims.
[0030] In the following description, numerous specific details are set forth in order to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to one skilled in the art that embodiments of the present disclosure may be practiced without some of these specific details.
[0031] The present disclosure relates to the field of air suspension control system in vehicles. More particularly, the present disclosure relates to a conventional air suspension control system and method incorporated in multi-axle trailers featuring automatic lift and drop mechanisms for lift axle/axles, based on load conditions.
[0032] The disclosure adapts automatic raising and lowering of lift axles depending on whether the trailer is loaded or unloaded. When the ignition is OFF, the axles are dropped to the ground, irrespective of load conditions. When the trailer is unladen (empty) and the ignition is ON, the lift axle is raised. Conversely, when the trailer is partially or fully loaded, the axle drops to the ground based on the pressure in the main air bellows due to the load—i.e., when fully loaded, all the axles are grounded. As well, when the ignition is ON and the trailer is unladen, the lift axle remains raised, but when the ignition is OFF, the lift axle drops and remains down, regardless of the load. In trailers equipped with two lift axles, the axles drop sequentially based on load. Under partial load, the second axle drops first, and the first axle drops only when the trailer is fully loaded. When the trailer is fully loaded and the traction switch is triggered, the lift axle is raised for a predefined duration to improve traction and maneuverability. After this time, the axle is automatically lowered to continue supporting the load.
[0033] FIG. 1A illustrates an exemplary schematic diagram of the air suspension control system (100) for multi-axle trailers having single Lift Axle, featured Auto Drop & Auto Lift with-Load dependent, in accordance with an embodiment of the present disclosure.
[0034] With reference to Fig. 1A, the system (100) includes a trailer lift axle control unit, and a lift axle mechanism. The trailer lift axle control unit is integrated with a plurality of solenoid valves and a differential pressure switch to manage positioning of a lift axle. The lift axle is dropped to a ground, when an ignition switch is OFF, regardless of load and the lift axle is raised, when a trailer is unladen provided the ignition switch is ON.
[0035] In an embodiment, the differential pressure switch is configured to utilize air pressure variations to control the automatic lifting and dropping of axles. The trailer lift axle control unit and the system are provided with a quick release valve to rapidly release air pressure when required.
[0036] In an embodiment, the system (100) further includes a pressure protection valve, a pressure limiting valve and an air tank. The pressure protection valve prioritizes brake system pressure before supplying air to auxiliary systems. The pressure limiting valve regulates delivery air pressure to maintain safe operation. The air tank is configured for storing and supplying pressurized air. The system (100) includes a height control mechanism utilizing a leveling valve that maintains a constant ride height for the trailer by adjusting air suspension pressure accordingly. The system (100) includes a suspension lift axle control valve that is electrically triggered to automatically lift or drop the lift axle based on real-time load conditions.
[0037] In an embodiment, the first mode or configuration 1 relates to conventional air suspension controls incorporated in multi axled trailers having lift axle / axles, featured auto drop & auto lift with-load dependent. The lift axle is moved up, when the trailer is in unladen, at ignition switch ON. The lift axle is dropped down, depending on pressure in main air bellow due to load, when the trailer is fully loaded. The lift axle is dropped and stayed down, when the trailer is in unladen or laden, at ignition switch OFF. The System is used for controlling the lift axle of a multi-axle Trailer and performs the following functions. The lift axles are automatically raised or lowered depending on vehicle load condition. Lift axle is lowered during Ignition OFF to avoid theft of wheels.
[0038] FIG. 1B illustrates an exemplary schematic circuit diagram of the lift axle control valve of the air suspension control system having single Lift Axle (100B), featured Auto Drop & Auto Lift with-Load dependent, in accordance with an embodiment of the present disclosure.
[0039] With reference to Fig. 1B, in the Lift axle Valve (5/2 Spool Valve) Port 11 Inlet connects from Rear Air Bellow & connected through Valve Port 21 to Load Bellow of lift axle. From the Trailer Air suspension Tank, through Pressure limiting Valve Port 12 (Inlet) of Lift axle Valve is connected & Delivery Port No 22 of Lift axle valve is connected to Lift Chamber / Bellow. Lift axle Valve internally connected to port 11 through a throttle to a Buffer chamber & to Differential Pressure switch (Opening / Closing of electric connection @ Defined Pressure). An Solenoid coil is placed above the 5/2 Lift axle Valve, whenever coil is de energized Port 11 is connected to Delivery port 21, where Port 12 is blocked & Port 22 is connected to common Exhaust by, which lift axle will be on Ground & by energizing Solenoid coil, Port 11 is blocked & delivery port 21 is connected to Exhaust allowing supplied air pressure to load bellow to get exhaust , simultaneously Port 12 connecting to port 22 by which , air pressure sent to Lift Chamber / Bellow to lift the Lift axle up from the ground. For the above valve Electric power is supplied from Battery via Ignition Switch, Differential Pressure Switch & Solenoid coil then to grounded.
[0040] FIG. 2A illustrates an exemplary schematic diagram of the air suspension control system for multi-axle trailers having single Lift Axle, featured Auto Drop & Auto Lift with-Load dependent and traction support (200A), in accordance with an embodiment of the present disclosure.
[0041] With reference to Fig. 2A, the second mode or configuration 2 relates to Conventional Air Suspension Controls Incorporated in Multi Axled Trailers having Lift Axle, featured Auto Drop & Auto Lift with-Load dependent, in Additional below features by raising lift Axle at Laden for desired period preferably 180 seconds to attain Traction & goes to its normal Function (Opting Front Axle for Traction Support & Prevent/ reduce from Tyre wear / Rear most Axle for maneuver at narrow turnings by decreasing the Trailer wheel base.). The lift axle is moved up, when the trailer is in unladen, at ignition switch ON. The lift axle is dropped down, depending on pressure in main air bellow due to load, when the trailer is fully loaded. The lift axle is dropped and stayed down, when the trailer is in unladen or laden, at ignition switch OFF. The traction switch is triggered to lift the lift axle and stay up for predefined duration then drops down automatically, when the trailer is fully loaded. The System is used for controlling the lift axle of a multi-axle Trailer and performs the following functions. The lift axles are automatically raised or lowered depending on vehicle load condition. During Traction ON, lift axle raise’s up & stays up for predefined duration & drops down automatically, when the vehicle is fully loaded for better Traction and Maneuverability of vehicle. Lift axle to be lowered during Ignition OFF to avoid theft of wheels.
[0042] FIG. 2B illustrates an exemplary schematic circuit diagram of the lift axle control valve of the air suspension control system having single Lift Axle, featured Auto Drop & Auto Lift with-Load dependent and traction support with tyre save system (200B), in accordance with an embodiment of the present disclosure.
[0043] With reference to Fig. 2B, in Lift axle Valve (5/2 Spool Valve) Port 11 Inlet connects from Rear Air Bellow & connected through Valve Port 21 to Load Bellow of lift axle. From the Trailer Air suspension Tank, through Pressure limiting Valve Port 12 (Inlet) of Lift axle Valve is connected & Delivery Port No 22 of Lift axle valve is connected to Lift Chamber / Bellow. Lift axle Valve is internally connected to port 11 through a throttle to a Buffer chamber & to Differential Pressure switch (Opening / Closing of electric connection @ Defined Pressure). An Solenoid coil placed above the 5/2 Lift axle Valve, whenever coil is de energized Port 11 is connected to Delivery port 21, where Port 12 is blocked & Port 22 is connected to common Exhaust by which lift axle will be on Ground & by energizing Solenoid coil, Port 11 is blocked & delivery port 21 is connected to Exhaust allowing supplied air pressure to load bellow to get exhaust , simultaneously Port 12 connecting to port 22 by which , air pressure sent to Lift Chamber / Bellow to lift the Lift axle up from the ground. For the above valve Electric power is supplied from Battery via Ignition Switch, Differential Pressure Switch & Solenoid coil then to grounded. For Traction Option, an push button switch is provided at cabin, at Trailer laden , on opting traction , power from Ignition via traction switch to Timer Assy has been triggers, the Power fed to TIMER is directed from timer assembly to First axle Lift Axle Valve solenoid directly to get energize, by which, the lift axle lifts up to the desired Time ,where the load shared to drive axle of Tractor to have traction & Lifted Axle drops down automatically to support the trailer Load after the set time.
[0044] FIG. 3A illustrates an exemplary schematic diagram of the air suspension control system for multi-axle trailers having twin Lift Axles (300A), featured Auto Drop & Auto Lift with-Load dependent, in accordance with an embodiment of the present disclosure.
[0045] With reference to Fig. 3A, the third mode or configuration 3 relates to Conventional Air Suspension Controls Incorporated in Multi Axled Trailers having Two Lift Axles, featured Auto Drop sequentially & Auto Lift with-Load dependent. A first lift axle and a second lift axle are moved up, when the trailer is in unladen, at ignition switch ON. The second lift axle is dropped down at first, when the trailer is at partial laden. The first lift axle is dropped down sequentially at second depending on pressure in main air bellow due to load, when the trailer is fully loaded. The both lift axles are dropped and stayed down, when the trailer is in unladen or laden, at ignition switch OFF. The System is used for controlling the lift axle of a multi-axle Trailer and performs the following functions. The lift axles are automatically raised or lowered Sequentially first, second lift Axle & followed with First Lift Axle respectively. depending on vehicle load condition. Lift axle to be lowered during Ignition OFF to avoid theft of wheels.
[0046] FIG. 3B illustrates an exemplary schematic circuit diagram of the lift axle control valve of the air suspension control system having twin Lift Axles, featured Auto Drop & Auto Lift with-Load dependent (300B), in accordance with an embodiment of the present disclosure.
[0047] With reference to Fig. 3B, in First Axle’s & Second Axle’s Lift axle Valves (5/2 Spool Valve) Port 11 Inlet connects from Rear Air Bellow & connected through Valve Port 21 to Load Bellow of lift axles. From the Trailer Air suspension Tank, through Pressure limiting Valve Port 12 (Inlet) of Lift axle Valves is connected & Delivery Port No 22 of Lift axle valve is connected to Lift Chamber / Bellows respective Lift axles. Both First & Second respective Lift axle Valve internally connected to port 11 through a throttle to a Buffer chamber & to Differential Pressure switch (Opening / Closing of electric connection @ Defined Pressure). Both First & Second respective lift axle’s Solenoid coil placed above the 5/2 Lift axle Valve, whenever coil is de energized Port 11 is connected to Delivery port 21, where Port 12 is blocked & Port 22 is connected to common Exhaust by, which lift axle will be on Ground & by energizing Solenoid coil, Port 11 is blocked & delivery port 21 is connected to Exhaust allowing supplied air pressure to load bellow to get exhaust , simultaneously Port 12 connecting to port 22 by which , air pressure sent to Lift Chamber / Bellow to lift the Lift axle up from the ground. At Partial Laden second axle’s Lift Axle drops down first due the load (Pressure setting Less than First lift axle Valve) following at Full laden First Lift Axle drops down (Pressure setting is slightly higher that second Axle’s Lift Axle valve). Similarly, during Unloading First Lift axle goes up & following Second Lift Axle at no load condition. For the above Lift Axle valves Electric power is supplied from Battery via Ignition Switch, Differential Pressure Switch & Solenoid coil then to grounded.
[0048] FIG. 4A illustrates an exemplary schematic diagram of the air suspension control system for multi-axle trailers having twin Lift Axles, featured Auto Drop & Auto Lift with-Load dependent and traction support (400A), in accordance with an embodiment of the present disclosure.
[0049] With reference to Fig. 4A, the fourth mode or configuration 4 relates to Conventional Air Suspension Controls Incorporated in Multi Axled Trailers having Two Lift Axles, featured Auto Drop sequentially & Auto Lift with-Load dependent. in Additional below features by dropping lift Axle at Laden for desired period to attain Traction & goes to its normal Function (Opting Front Axle for Traction Support & Prevent/ Reduce from Tyre wear / Rear Axle for maneuver at narrow turnings by decreasing the Trailer wheel base.). A first lift axle and a second lift axle are moved up, when the trailer is in unladen, at ignition switch ON. The second lift axle is dropped down at first, when the trailer is at partial laden. The first lift axle is dropped down sequentially at second depending on pressure in main air bellow due to load, when the trailer is fully loaded. The both lift axles are dropped and stayed down, when the trailer is in unladen or laden, at ignition switch OFF. The traction switch is triggered to lift the first lift axle and stay up for predefined duration then drops down automatically, when the trailer is fully loaded. The System is used for controlling the lift axles of a multi-axle Trailer and performs the following functions. The lift axles are automatically raised or lowered Sequentially first, second lift Axle & followed with First Lift Axle respectively. depending on vehicle load condition. During Traction ON First Axle’s lift axle raise’s up & stays up for predefined duration & drops automatically, when the vehicle is fully loaded for better Traction and Maneuverability of vehicle. Lift axles to be lowered during Ignition OFF to avoid theft of wheels.
[0050] FIG. 4B illustrates an exemplary schematic circuit diagram of the lift axle control valve of the air suspension control system having twin Lift Axles, featured Auto Drop & Auto Lift with-Load dependent and traction support with tyre save system (400B), in accordance with an embodiment of the present disclosure.
[0051] With reference to Fig. 4B, in First Axle’s & Second Axle’s Lift axle Valves (5/2 Spool Valve) Port 11 Inlet connects from Rear Air Bellow & connected through Valve Port 21 to Load Bellow of lift axles. From the Trailer Air suspension Tank, through Pressure limiting Valve Port 12 (Inlet) of Lift axle Valves is connected & Delivery Port No 22 of Lift axle valve is connected to Lift Chamber / Bellows respective Lift axles. Both First & Second respective Lift axle Valve internally connected to port 11 through a throttle to a Buffer chamber & to Differential Pressure switch (Opening / Closing of electric connection @ Defined Pressure). Both First & Second respective lift axle’s Solenoid coil placed above the 5/2 Lift axle Valve, whenever coil is de energized Port 11 is connected to Delivery port 21, where Port 12 is blocked & Port 22 is connected to common Exhaust by, which lift axle will be on Ground & by energizing Solenoid coil, Port 11 is blocked & delivery port 21 is connected to Exhaust allowing supplied air pressure to load bellow to get exhaust , simultaneously Port 12 connecting to port 22 by which , air pressure sent to Lift Chamber / Bellow to lift the Lift axle up from the ground. At Partial Laden second axle’s Lift Axle drops down first due the load (Pressure setting Less than First lift axle Valve) following at Full laden First Lift Axle drops down (Pressure setting is slightly higher that second Axle’s Lift Axle valve). Similarly, during Unloading First Lift axle goes up & following Second Lift Axle at no load condition. For the above Lift Axle valves Electric power is supplied from Battery via Ignition Switch, Differential Pressure Switch & Solenoid coil then to grounded. For traction option, an push button switch has been provided at cabin, at Trailer laden , on opting traction , power from Ignition via traction switch to Timer Assy has been triggers, the Power fed to TIMER is directed from timer assembly to First axle Lift Axle Valve solenoid directly to get energize, by which, the First lift axle lifts up to the desired Time ,where the load shared to drive axle of Tractor to have traction & Lifted Axle drops down automatically to support the trailer Load after the set time.
[0052] FIG. 5 illustrates a flow diagram illustrating a method (500) for controlling lift axle positioning in multi-axle trailers, in accordance with an embodiment of the present disclosure.
[0053] In an embodiment, in step 502, the method 500 includes detecting trailer load conditions using a differential pressure switch in conjunction with buffer volume & throttle valve.
[0054] In an embodiment, in step 504, the method 500 includes automatically lifting or dropping a lift axle based on predefined thresholds of air pressure.
[0055] In an embodiment, in step 506 the method 500 includes temporarily raising the lift axle via a traction switch for a predetermined time duration to optimize vehicle maneuverability.
[0056] In an embodiment, in step 508 the method 500 includes automatically restoring the lift axle to its load-bearing position after the traction-assist duration expires.
[0057] In an embodiment, the method 500 further includes optimizing traction control in fully loaded trailers by temporarily lifting a first axle when the trailer is fully loaded by engaging the traction switch, maintaining the raised axle position for predefined duration before automatically returning to its normal supporting position and enhancing traction and maneuverability by selectively lifting axles based on predefined conditions of load and trailer movement.
[0058] In an implementation of an embodiment, a trailer is parked and ready for loading. The trailer is initially unladen, and the ignition is OFF. The truck driver turns ON the ignition. The system detects that the trailer is unladen and automatically raises the lift axle. As cargo is loaded, the system monitors air pressure changes in the main air bellows. Once the trailer reaches partial load, the system deploys the second lift axle. Upon reaching full load, the first lift axle is lowered. The trailer begins transit with optimized weight distribution. The system ensures proper axle positioning for load conditions, improving fuel efficiency and reducing tire wear.
[0059] In an implementation of an embodiment, the trailer is navigating a steep incline with a full load. The trailer is fully loaded, and traction is required. The truck driver engages the traction switch. The system temporarily lifts the lift axle for a predefined duration. The increased weight on the drive axle improves traction and maneuverability. After the predefined duration, the system automatically returns the lift axle to its load-supporting position. The system enhances vehicle control and traction on difficult terrains.
[0060] In an implementation of an embodiment, a multi-axle trailer with two lift axles is gradually loaded. The trailer is initially empty, and the ignition is ON. The system detects that the trailer is unladen and keeps both lift axles raised. As partial load is detected, the system drops the second lift axle first. Upon reaching full load, the system lowers the first lift axle to distribute weight evenly. The trailer operates with both axles down under full load conditions. The system ensures stepwise axle deployment for optimized load distribution and stability.
[0061] In an exemplary embodiment, the system (100) includes a trailer lift axle control unit, a traction switch, and a lift axle mechanism. The trailer lift axle control unit is integrated with a plurality of solenoid valves and a differential pressure switch to manage positioning of a lift axle. The traction switch is programmed with a timer that raises the lift axle for a predefined duration under full load to improve traction and maneuverability and after the said predefined duration, the lift axle returns to its load-supporting position automatically. The lift axle mechanism automatically adjusts a position of auto drop and auto lift of a set of lift axles based on load conditions. The lift axle mechanism operates in multiple modes. The lift axle is dropped to a ground, when an ignition switch is OFF, regardless of load and the lift axle is raised, when a trailer is unladen provided the ignition switch is ON. The lift axle is dropped at full laden for desired period to attain traction and moves to normal function. A second axle is dropped at first under partial load and a first axle is dropped at second under full load, for multi axled trailers having two lift axles. The lift axles are dropped and stays down, regardless of load and lifts the first axle lifts and stays up for desired period and then drops down automatically, when the trailer at full laden on triggering the traction switch. In an embodiment, the lift axle drops to the ground, when the ignition switch is OFF, regardless of load, as a security measure to prevent tyre theft. The traction switch is programmed with an automatic return function that restores the lift axle to its load-supporting position after the said predefined duration expires. The trailer lift axle control unit integrated with the plurality of solenoid valves and the differential pressure switch is configured to utilize air pressure variations to control the automatic lifting and dropping of axles. The trailer lift axle control unit is provided with a quick release valve to rapidly release air pressure when required.
[0062] Moreover, in interpreting the specification, all terms should be interpreted in the broadest possible manner consistent with the context. In particular, the terms “comprises” and “comprising” should be interpreted as referring to elements, components, or steps in a non-exclusive manner, indicating that the referenced elements, components, or steps may be present, or utilized, or combined with other elements, components, or steps that are not expressly referenced. Where the specification claims refer to at least one of something selected from the group consisting of A, B, C ….and N, the text should be interpreted as requiring only one element from the group, not A plus N, or B plus N, etc.
[0063] While the foregoing describes various embodiments of the proposed disclosure, other and further embodiments of the proposed disclosure may be devised without departing from the basic scope thereof. The scope of the proposed disclosure is determined by the claims that follow. The proposed disclosure is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.

ADVANTAGES OF THE PRESENT DISCLOSURE
[0064] The present disclosure provides an air suspension control system and method for multi-axle trailers.
[0065] The present disclosure provides a system that ensures improved vehicle efficiency, better traction, enhanced safety, and reduced tyre wear.
[0066] The present disclosure provides a system that optimizes trailer performance under various loading conditions while incorporating security features to prevent unauthorized usage, by utilizing electronic and pneumatic control components.
[0067] The present disclosure provides a system that ensures security and prevents unauthorized tyre removal.
, Claims:1. An air suspension control system (100) for multi-axle trailers, said system (100) comprising:
a trailer lift axle control system integrated with a plurality of solenoid valves and a differential pressure switch to manage positioning of a lift axle;
a traction switch programmed with a timer that raises the lift axle for a predefined duration under full load to improve traction and maneuverability and after the said predefined duration, the lift axle returns to its load-supporting position automatically; and
a lift axle mechanism that automatically adjusts a position of auto drop and auto lift of a set of lift axles based on load conditions;
wherein the lift axle mechanism operates in multiple modes to:
drop the lift axle to a ground, when an ignition switch is OFF, regardless of load and raise the lift axle, when a trailer is unladen provided the ignition switch is ON;
drop the lift axle at full laden for desired period to attain traction and moves to normal function;
drop a second axle at first under partial load and drop a first axle at second under full load, for multi axled trailers having two lift axles; and
drops lift axles and stays down, regardless of load and lifts the first axle and stays up for desired period and then drops down automatically, when the trailer at full laden on triggering the traction switch.
2. The system (100) as claimed in claim 1, the lift axle drops to the ground, when the ignition switch is OFF, regardless of load, as a security measure to prevent tyre theft.

3. The system (100) as claimed in claim 1, wherein the traction switch is programmed with an automatic return function that restores the lift axle to its load-supporting position after the said predefined duration expires.
4. The system (100) as claimed in claim 1, wherein the trailer lift axle control system integrated with the plurality of solenoid valves and the differential pressure switch is configured to utilize air pressure variations to control the automatic lifting and dropping of axles.
5. The system (100) as claimed in claim 1, wherein the trailer lift axle control system is provided with a quick release valve to rapidly release air pressure when required.
6. The system (100) as claimed in claim 1, wherein the system (100) further comprising:
a pressure protection valve that prioritizes brake system pressure before supplying air to auxiliary systems;
a pressure limiting valve that regulates delivery air pressure to maintain safe operation; and
an air tank for storing and supplying pressurized air.

7. The system (100) as claimed in claim 1, wherein the system (100) comprising a height control mechanism utilizing a leveling valve that maintains a constant ride height for the trailer by adjusting air suspension pressure accordingly.
8. The system (100) as claimed in claim 1, wherein the system (100) comprising a suspension lift axle control valve that is electrically triggered to automatically lift or drop the lift axle based on real-time load conditions.
9. The system (100) as claimed in claim 1, wherein the lift axle mechanism operates in first mode by:
moving up of the lift axle, when the trailer is in unladen, at ignition switch ON;
dropping down of the lift axle, depending on pressure in main air bellow due to load, when the trailer is fully loaded; and
dropping and staying down of the lift axle, when the trailer is in unladen or laden, at ignition switch OFF.
10. The system (100) as claimed in claim 1, wherein the lift axle mechanism operates in second mode by:
moving up of the lift axle, when the trailer is in unladen, at ignition switch ON;
dropping down of the lift axle, depending on pressure in main air bellow due to load, when the trailer is fully loaded;
dropping and staying down of the lift axle, when the trailer is in unladen or laden, at ignition switch OFF; and
triggering the traction switch to lift the lift axle and stay up for predefined duration then drops down automatically, when the trailer is fully loaded.
11. The system (100) as claimed in claim 1, wherein the lift axle mechanism operates in third mode by:
moving up of a first lift axle and a second lift axle, when the trailer is in unladen, at ignition switch ON;
dropping down of the second lift axle at first, when the trailer is at partial laden;
dropping down sequentially of the first lift axle at second depending on pressure in main air bellow due to load, when the trailer is fully loaded; and
dropping and staying down of the both lift axles, when the trailer is in unladen or laden, at ignition switch OFF.
12. The system (100) as claimed in claim 1, wherein the lift axle mechanism operates in fourth mode by:
moving up of a first lift axle and a second lift axle, when the trailer is in unladen, at ignition switch ON;
dropping down of the second lift axle at first, when the trailer is at partial laden;
dropping down sequentially of the first lift axle at second depending on pressure in main air bellow due to load, when the trailer is fully loaded;
dropping and staying down of the both lift axles, when the trailer is in unladen or laden, at ignition switch OFF; and
triggering the traction switch to lift the first lift axle and stay up for predefined duration then drops down automatically, when the trailer is fully loaded.
13. A method (500) for controlling lift axle positioning in multi-axle trailers, wherein said method (500) comprising:
detecting (502) trailer load conditions using a differential pressure switch in conjunction with a buffer volume and throttle valve;
automatically lifting or dropping (504) a lift axle based on predefined thresholds of air pressure;
temporarily raising (506) the lift axle via a traction switch for a predefined duration to optimize vehicle maneuverability; and
automatically restoring (508) the lift axle to its load-bearing position after the traction-assist duration expires.
14. The method (500) as claimed in claim 14, wherein the method (500) further comprising optimizing traction control in fully loaded trailers by temporarily lifting a first axle when the trailer is fully loaded by engaging the traction switch, maintaining the raised axle position for predefined duration before automatically returning to its normal supporting position and enhancing traction and maneuverability by selectively lifting axles based on predefined conditions of load and trailer movement.