Patent ID: 8022666

Claim:
An electric public transit system, comprising an electric driven bus equipped with a cassette battery set and a bus-mounted control system; a charge station placed in a predetermined place for charging cassette battery sets; and a loading and unloading apparatus; wherein when the bus needs change the cassette battery set, the loading and unloading apparatus unloads the cassette battery set from the bus and loads a charged cassette battery set into the bus; the charge station is equipped with a charge control system, and the loading and unloading apparatus is equipped with a loading and unloading control system; the loading and unloading control system, the bus-mounted control system and the charge control system are able to intercommunicate; whereby when the loading and unloading control system receives a signal sent from the bus-mounted control system of the bus that the bus will return to the charge station, the loading and unloading control system moves the loading and unloading apparatus to a predetermined position corresponding to the bus at the charge station and waits; and when the bus arrives at the predetermined position, the loading and unloading control system controls the loading and unloading apparatus to exchange the cassette battery set with a charged cassette battery set, whereby the bus is able to operate on line continuously; the charge station further includes a charger, and a power grid auto-trace apparatus for searching electrical consumption data of a power grid; and the charge control system determines whether the power grid used is in valleys based on the searching data of the power grid auto-trace apparatus; if yes, a full charge program is started in the charger controlled by the charge control system, and the cassette battery set is charged with full current until the cassette battery set is fully charged; if no, a float charge program is started in the charger controlled by the charge control system, and the cassette battery set is charged with float current.