Abstract: A crossover protection system includes a processor, a memory, and machine readable instructions. The machine readable instructions cause the processor to determine a smart elbow position based on a signal output of a sensor of a smart elbow and determine whether the smart elbow position is within a geofence of a distribution tank including a same fuel type as a liquid product stored in a tank compartment. The processor further, in response to a determination that the smart elbow position is within the geofence of the distribution tank of the same fuel type as the liquid product, permits the liquid product to the distribution tank, and in response to a determination that the smart elbow position is outside the geofence of the distribution tank of the same fuel type as the liquid product, prevents the liquid product from flowing to the distribution tank.

Abstract: A proportional solenoid valve control system is applicable to hydraulic systems of heavy equipment, automatic transmission systems and furl injectors of vehicles. This system includes main circuitry which is composed of a switching element, a proportional solenoid valves, and a current detection resistor; and a control circuit which is composed of a current command detection circuit, a rectifier, an offset circuit, a current command adding and limiting circuit, an offset circuit, a current command adding and limiting circuit, a current detection circuit, an proportional integrator-controller, a pulse width modulation comparator, and an output circuit. In addition, the system, precisely controls the load currents flowing in the proportional solenoid valves according to the current commend.

Abstract: A proportional solenoid valve control system limits the current flowing in a solenoid valve if the command current is higher than a fixed value which can be set by a user. A current command limiting circuit limits the current command by providing a fixed value as an output when a current command exceeds the predetermined level.