Suspension system for a vehicle

A closed leveling system for a vehicle, the closed leveling system comprising:

• a suspension system having a plurality of corners, wherein each corner of the plurality of corners of the suspension system comprises at least one strut of a plurality of struts configured to be coupled to at least one wheel of a plurality of wheels of the vehicle;
• at least one sensor configured to measure a roll angle and a pitch angle of the vehicle;
• a master controller in communication with the at least one sensor, the master controller comprising:
• a non-volatile memory device comprising computer-readable instructions containing a targeted angle for at least one of the roll angle or the pitch angle of the vehicle;
• and
• a processor in communication with the non-volatile memory device;
• a power module assembly comprising:
• a reservoir containing a compressible liquid;
• a pump configured to withdraw a volume of the compressible liquid from the reservoir;
• at least one dump valve configured to transfer a volume of the compressible liquid into the reservoir;
• and
• a plurality of isolation valves, each isolation valve of the plurality of isolation valves being associated with at least one corner of the plurality of corners;
• and
• a plurality of secondary volumes in selective fluid communication with the reservoir, each secondary volume of the plurality of secondary volumes being associated with one isolation valve of the plurality of isolation valves and at least one corner of the plurality of corners,
• wherein, in response to at least one of the roll angle or the pitch angle of the vehicle being outside a first threshold angle about the targeted angle, the computer-readable instructions, when executed by the processor, cause the master controller to:
• raise at least one corner of the plurality of corners by activating the pump and opening at least one isolation valve of the plurality of isolation valves to deliver the volume of the compressible liquid to the at least one corner of the plurality of corners;
• and/or
• lower at least one corner of the plurality of corners by opening the at least one dump valve and opening at least one isolation valve of the plurality of isolation valves to withdraw a volume of the compressible liquid from the at least one corner of the plurality of corners to change the at least one of the roll angle or the pitch angle to be inside the first threshold angle about the targeted angle.

A vehicle comprising:

• a cab on a frame, or a unibody;
• a plurality of wheels;
• a steering device operably coupled to at least one wheel of the plurality of wheels;
• a user interface;
• and
• a closed leveling system comprising:
• a suspension system having a plurality of corners, wherein each corner of the plurality of corners of the suspension system comprises at least one strut of a plurality of struts coupling at least one wheel of the plurality of wheels to the frame or the unibody;
• at least one sensor selected from the group consisting of a plurality of height sensors, a steering sensor, and at least one acceleration sensor;
• a master controller in communication with the at least one sensor, the master controller comprising:
• a non-volatile memory device comprising computer-readable instructions;
• and
• a processor in communication with the non-volatile memory device;
• a power module assembly comprising:
• a reservoir containing a compressible liquid;
• a pump configured to withdraw a volume of the compressible liquid from the reservoir;
• at least one dump valve configured to transfer a volume of the compressible liquid into the reservoir;
• and
• a plurality of isolation valves, each isolation valve of the plurality of isolation valves being associated with at least one corner of the plurality of corners;
• and
• a plurality of secondary volumes in selective fluid communication with the reservoir, each secondary volume of the plurality of secondary volumes being associated with one isolation valve of the plurality of isolation valves and at least one corner of the plurality of corners,
• wherein the instructions stored in the memory device, when executed by the processor, cause the closed leveling system to auto-calibrate the at least one sensor in response to an input on the user interface, and
• wherein the instructions stored in the memory device, when executed by the processor, further cause the closed leveling system to display an error on the user interface in response to any one of the at least one sensor outputting a signal outside of a normal operating range or that deviates beyond a threshold deviation from an expected value.

A vehicle comprising:

• a cab on a frame, or a unibody;
• a plurality of wheels;
• a steering device operably coupled to at least one wheel of the plurality of wheels;
• and
• a closed leveling system comprising:
• a suspension system having a plurality of corners, wherein each corner of the plurality of corners of the suspension system comprises at least one strut of a plurality of struts coupling at least one wheel of the plurality of wheels to the frame or the unibody;
• at least one sensor configured to measure a parameter related to at least one of a roll of the vehicle, a pitch of the vehicle, a yaw of the vehicle, or a height of the vehicle;
• a master controller in communication with the at least one sensor, the master controller comprising:
• a non-volatile memory device comprising computer-readable instructions;
• and
• a processor in communication with the non-volatile memory device;
• a reservoir containing a compressible liquid;
• a plurality of isolation valves, each isolation valve of the plurality of isolation valves being associated with at least one corner of the plurality of corners;
• a plurality of secondary volumes in selective fluid communication with the reservoir, each secondary volume of the plurality of secondary volumes being associated with one isolation valve of the plurality of isolation valves and at least one corner of the plurality of corners;
• a plurality of rate valves, each rate valve of the plurality of rate valves being associated with one secondary volume of the plurality of secondary volumes, and wherein the plurality of rate valves are configured to move between an open configuration in which the plurality of secondary volumes are in fluid communication with the plurality of corners and a closed configuration in which the plurality of secondary volumes are isolated from the plurality of corners;
• and
• a pump configured to withdraw a volume of the compressible liquid from the reservoir;
• wherein the instructions stored in the memory device, when executed by the processor, cause the closed leveling system to:
• adjust a duty cycle (DC) and/or a proportionality of at least one rate valve of the plurality of rate valves based on a position value, a velocity value, and a direction of at least one of the position value or the velocity value associated with at least one of the roll of the vehicle, the pitch of the vehicle, the yaw of the vehicle, or the height of the vehicle.