Electrical ground isolation and secondary failure reduction detection and isolation
View Patent ↗A system for isolating electrical ground faults and secondary failures in an electrical system, the system comprising an AC ground isolation state machine for detecting and isolating an AC ground, a DC ground isolation state machine for detecting and isolating a DC ground, a component failure isolation state machine for detecting and isolating a change in a resistance, and a component failure early detection algorithm for determining a failure before using the state machines.
1. A system for isolating electrical ground faults and secondary failures in an off road vehicle propulsion system, said system comprising:
an AC ground isolation state machine for isolating a traction motor or alternator when an AC ground is detected;
a DC ground isolation state machine for isolating a grid box when a DC ground is detected;
a dynamic braking grid failure isolation state machine for isolating a grid box when a change in resistance is detected;
a dynamic braking grid failure early detection algorithm for determining a failure before using said state machines; and
a traction motor ground isolation per axle torque limit system connected to said AC ground isolation state machine.
2. A system for isolating electrical ground faults and secondary failures in an off road vehicle propulsion system, said system comprising:
an AC ground isolation state machine for isolating a traction motor or alternator when an AC ground is detected;
a DC ground isolation state machine for isolating a grid box when a DC ground is detected;
a dynamic braking grid failure isolation state machine for isolating a grid box when a change in resistance is detected;
a dynamic braking grid failure early detection algorithm for determining a failure before using said state machines; and
a supplemental voltage functions system providing voltage average rates and alternator rectifier bias state information to said state machines and said early detection algorithm.
3. The system of claim 1 wherein said dynamic braking grid failure early detection algorithm comprises a model of operation conditions which are compared to actual operation conditions to determine a failure in said propulsion system.
4. The system of claim 1 wherein said algorithm compares a modeled speed of a blower to an actual speed of said blower.
5. The system of claim 1 wherein the off road vehicle is at least one of a locomotive and an off highway vehicle.
6. The system of claim 2 wherein said dynamic braking grid failure early detection algorithm comprises a model of operation conditions which are compared to actual operation conditions to determine a failure in said propulsion system.
7. The system of claim 2 wherein said algorithm compares a modeled speed of a blower to an actual speed of said blower.
8. The system of claim 2 wherein the off road vehicle is at least one of a locomotive and an off highway vehicle.