The invention detects at least either one of a supply fault and a ground fault distinctively from a disconnection. A compressor relay 22 is placed between a battery 21 and an air compressor module 5. The compressor relay 22 controls the drive and stop of the air compressor module 5. A compressor driver 26 outputs a drive signal to the compressor relay 22. A ground-side voltage monitor 28 detects the drive voltage of the compressor relay 22. A pressure sensor 17 detects air pressure in a discharge side of the air compressor module 5. A microcomputer 30 of a controller 25 detects a ground fault and a disconnection of the drive signal of the compressor 22 distinctively from each other on the basis of a voltage value Vg detected by the ground-side voltage monitor 28 and a pressure valve P detected by the pressure sensor 17.

A device for indicating a replacement time of a composite leaf spring constantly monitors durability of the composite leaf spring, which is formed by mixing unidirectional glass fiber and epoxy resin, and informs a driver of an appropriate replacement time of the composite leaf spring based on the monitoring result.

A replacement indicator for a shock absorber includes a pressure sensor which monitors pressure of operating fluid inside the shock absorber. The replacement indicator includes an indicative mechanism operatively coupled with the pressure sensor. The indicative mechanism includes an indicator component coupled to the shock absorber. The indicator component gets displaced relative to an outer surface of the shock absorber when the pressure of the operating fluid drops below a threshold pressure.

A system for a vehicle includes a memory storing a stored driver distribution profile of a driver input parameter and a stored suspension setting corresponding to the stored driver distribution profile. The system further includes a sensor to detect a current value of the driver input parameter. The system further includes a processor communicably coupled to the memory and the sensor. The processor is configured to determine a current driver distribution profile of the driver input parameter based on the current value of the driver input parameter. The processor is configured to determine a current suspension setting based on the current driver distribution profile. The processor is configured to adjust the stored suspension setting to generate a stored adjusted suspension setting corresponding to the current suspension setting.

A system includes: a state module configured to selectively set a present state to a first state; a valve control module configured to determine first target open and closed states for valves of a suspension system based on the present state and to open and close the valves according to the first target open and closed states, respectively; a pump control module configured to, when the valves are in the first target open and closed states, respectively, selectively operate an electric pump in a first direction to increase hydraulic fluid pressure in a first portion of the suspension system; and a leak module configured to selectively diagnose a leak in a first one of the valves associated with the first state based on a first pressure in the first portion of the suspension system while the valves are open and closed according to the first target open and closed states.

Methods and systems are provided for diagnosing a shock absorber coupled to a vehicle tire. In one example, a sensor of a tire pressure measurement system coupled inside a tire is used to measure a tire pressure as well as an oscillatory behavior of the tire. A state of health of a shock absorber coupled to the tire is estimated based on the oscillatory behavior.

A method for monitoring a vehicle (1) having a vehicle superstructure (2), a chassis (3) connected to the vehicle superstructure (2), and a monitoring unit (11) which monitors the chassis (3) for damage. In the event that chassis damage is detected, the monitoring unit produces a warning signal (S) by means of a warning signal generator, where the warning signal generator has at least one drive unit (10) by means of which the warning signal (S) is produced in the form of a tactile mechanical vibration.

A replacement indicator for a shock absorber includes a pressure sensor which monitors pressure of operating fluid inside the shock absorber. The replacement indicator includes an indicative mechanism operatively coupled with the pressure sensor. The indicative mechanism includes an indicator component coupled to the shock absorber. The indicator component gets displaced relative to an outer surface of the shock absorber when the pressure of the operating fluid drops below a threshold pressure.

Methods and systems are provided for conducting an evaporative emissions test on a fuel system in a vehicle. In one example, in response to a determination, based on the prevailing vehicle and ambient thermal conditions, that altering vehicle height may increase pressure or vacuum build during a pressure or vacuum build phase of an engine off natural vacuum test, employing the vehicle's active suspension to make said height adjustments. In this way the accuracy of engine off natural vacuum testing can be improved, and the conditions under which such testing can be efficaciously conducted increased.

Methods, systems, and vehicles are provided for controlling an active control system for a vehicle. In one embodiment, a method for controlling an active control system includes determining a health of a first control system, via a first processor of the first control system; determining a health of a second control system, via a second processor of the second control system; selectively controlling the active control system with instructions from the first control system or the second control system, based on the health of the first control system and the second control system; and selectively controlling communications from the first control system and the second control system, based on the health of the first control system and the second control system.